WO2011070836A1 - 表示パネル、液晶表示装置、および、駆動方法 - Google Patents
表示パネル、液晶表示装置、および、駆動方法 Download PDFInfo
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- WO2011070836A1 WO2011070836A1 PCT/JP2010/066453 JP2010066453W WO2011070836A1 WO 2011070836 A1 WO2011070836 A1 WO 2011070836A1 JP 2010066453 W JP2010066453 W JP 2010066453W WO 2011070836 A1 WO2011070836 A1 WO 2011070836A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133397—Constructional arrangements; Manufacturing methods for suppressing after-image or image-sticking
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136213—Storage capacitors associated with the pixel electrode
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0219—Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
Definitions
- the present invention relates to a display panel that displays an image using liquid crystal.
- the present invention also relates to a liquid crystal display device including such a display panel.
- image display devices for displaying images are roughly classified into impulse-type image display devices such as CRTs (cathode ray tubes) and hold-type image display devices such as liquid crystal display devices.
- CRTs cathode ray tubes
- hold-type image display devices such as liquid crystal display devices.
- an impulse-type image display device a lighting period in which an image is displayed and a light-out period in which no image is displayed are alternately repeated, whereas in a hold-type image display device, a light-out period is usually provided. Absent.
- the hold-type image display device has the property that moving image blur is likely to occur compared to the impulse-type image display device.
- Patent Document 1 discloses an image display apparatus that divides one frame period into two subframes and supplies image signals having different gradation levels to the first half subframe and the second half subframe, respectively. . According to the technique described in Patent Document 1, the above-mentioned moving image blurring phenomenon can be suppressed by making the luminance of the image in the first half subframe different from the luminance of the image in the second half subframe.
- Patent Document 1 has a problem that the manufacturing cost increases because a frame memory for temporarily storing the input image signal is required. Further, since it is necessary to access the frame memory every time a frame is displayed, there is a problem that power consumption increases.
- the present invention has been made in view of the above problems, and an object of the present invention is to realize a display panel capable of suppressing the above-mentioned motion blur phenomenon while suppressing an increase in manufacturing cost and power consumption. There is.
- a display panel includes a plurality of gate bus lines, a plurality of source bus lines, a plurality of auxiliary capacitance bus lines, and an arbitrary gate among the plurality of gate bus lines.
- a transistor having a gate connected to a bus line; a source connected to an arbitrary source bus line of the plurality of source bus lines; a pixel electrode connected to a drain of the transistor; A capacitor connected in parallel to the electrode to the drain of the transistor and the other end connected to an arbitrary auxiliary capacitance bus line of the plurality of auxiliary capacitance bus lines, and connected to one end of each of the plurality of source bus lines
- a source driver for supplying a source signal to the arbitrary source bus line, and the plurality of gate bus lines.
- a gate driver for sequentially supplying a conduction signal for conducting the transistor to the arbitrary gate bus line, a counter electrode facing the pixel electrode through a liquid crystal,
- a display panel comprising: a counter electrode wiring connected to the counter electrode; and a counter electrode driver for supplying a common potential to the counter electrode wiring, wherein the gate driver is connected to the arbitrary gate bus line.
- An auxiliary capacitance driver that supplies a rectangular voltage signal having a second voltage level different from the first voltage level, and includes a first scanning period; There are, period the rectangular voltage signal is said first voltage level, and, the second period is a voltage level, respectively, longer than the response time of the liquid crystal is characterized in that.
- a hold-type display device such as a liquid crystal display device
- an object stays at that position until a next frame is displayed after a frame is displayed. Even during a period in which the object is displayed, the moving object moves on the screen to track the object, so that a moving image blur phenomenon occurs in which the outline of the moving object is recognized as blurred.
- the display panel according to the present invention is connected to a plurality of gate bus lines, a plurality of source bus lines, a plurality of auxiliary capacitance bus lines, and an arbitrary gate bus line among the plurality of gate bus lines. And a pixel electrode connected to a drain of the transistor, one end of which is in parallel with the pixel electrode.
- a capacitor connected to the drain of the transistor and having the other end connected to an arbitrary auxiliary capacitance bus line of the plurality of auxiliary capacitance bus lines and one end of each of the plurality of source bus lines;
- a source driver for supplying a source signal to a source bus line of each of the plurality of gate bus lines
- a gate driver connected to one end and sequentially supplying a conduction signal for conducting the transistor to the arbitrary gate bus line; a counter electrode facing the pixel electrode through a liquid crystal layer; and a counter electrode
- a display panel comprising: a connected counter electrode wiring; and a counter electrode driver that supplies a common potential to the counter electrode wiring, wherein the gate driver is connected to the arbitrary gate bus line.
- the first voltage level and the first voltage are synchronized with the conduction signal for the arbitrary auxiliary capacitance bus line. Since the storage capacitor driver for supplying a rectangular voltage signal having a second voltage level different from the voltage level is provided, the above-mentioned lead bus is connected to the arbitrary gate bus line. In one scanning period from when a signal is supplied to when the next conduction signal is supplied, the first voltage level and the pixel electrode connected to the arbitrary gate bus line via the transistor are A second voltage level different from the first voltage level can be applied.
- the period in which the rectangular voltage signal is at the first voltage level and the period in which the voltage signal is at the second voltage level are respectively Longer than response time of liquid crystal.
- the response time of the liquid crystal is a time required for the alignment of the liquid crystal to change after an electric field is applied to the liquid crystal, and generally requires 1 ms or more.
- the luminance of the image in the pixel region in which the pixel electrode is formed can be changed to binary in the one scanning period.
- the auxiliary capacitor driver provided in the display panel according to the present invention supplies a rectangular voltage signal composed of the first voltage level and the second voltage level in synchronization with the conduction signal. Can do. Therefore, the voltage level of the rectangular voltage signal changes after a certain time has elapsed since the conduction signal was supplied.
- the light / dark switching is performed after a certain time has elapsed since the video data was updated in each of all the pixel regions on the screen. It can be carried out.
- the moving image blur can be suppressed without using a frame memory for temporarily storing the image signal. Therefore, the manufacturing cost can be reduced as compared with the conventional configuration using the frame memory for temporarily storing the image signal. In addition, there is an effect that power consumption can be reduced as compared with a conventional configuration using a frame memory for temporarily storing image signals.
- the driving method includes a plurality of gate bus lines, a plurality of source bus lines, a plurality of auxiliary capacitance bus lines, and a gate connected to an arbitrary gate bus line among the plurality of gate bus lines.
- a transistor connected to an arbitrary source bus line of the plurality of source bus lines, a pixel electrode connected to the drain of the transistor, and one end of the transistor in parallel with the pixel electrode A capacitor connected to the drain and the other end connected to any one of the plurality of auxiliary capacitance bus lines and to one end of each of the plurality of source bus lines, and the arbitrary source bus
- a source driver for supplying a source signal to the line and one end of each of the plurality of gate bus lines;
- a gate driver for sequentially supplying a conduction signal for conducting the transistor to the arbitrary gate bus line, a counter electrode facing the pixel electrode via a liquid crystal, and a counter connected to the counter electrode
- a driving method for driving a display panel including an electrode wiring and a counter electrode driver that supplies
- a voltage signal supply step of supplying a rectangular voltage signal having a second voltage level different from the first voltage level, and in the one scanning period, Period the rectangular voltage signal is said first voltage level, and, the second period is a voltage level, respectively, longer than the response time of the liquid crystal is characterized in that.
- the display panel according to the present invention is connected to a plurality of gate bus lines, a plurality of source bus lines, a plurality of auxiliary capacitance bus lines, and an arbitrary gate bus line among the plurality of gate bus lines. And a pixel electrode connected to a drain of the transistor, one end of which is in parallel with the pixel electrode.
- a capacitor connected to the drain of the transistor and having the other end connected to an arbitrary auxiliary capacitance bus line of the plurality of auxiliary capacitance bus lines and one end of each of the plurality of source bus lines;
- a source driver for supplying a source signal to a source bus line of each of the plurality of gate bus lines
- a gate driver connected to one end and sequentially supplying a conduction signal for conducting the transistor to the arbitrary gate bus line, a counter electrode facing the pixel electrode via a liquid crystal, and a connection to the counter electrode
- a counter electrode driver that supplies a common potential to the counter electrode wiring, wherein the gate driver is connected to the arbitrary gate bus line.
- At least the first voltage level and the first voltage are synchronized with the conduction signal for the arbitrary auxiliary capacitance bus line.
- a storage capacitor driver is provided for supplying a rectangular voltage signal having a second voltage level different from the voltage level. Further, in the one scanning period, a period in which the rectangular voltage signal is at the first voltage level and a period in which the rectangular voltage signal is at the second voltage level are longer than the response time of the liquid crystal.
- the moving image blur can be suppressed without using a frame memory for temporarily storing an image signal. Therefore, the manufacturing cost can be reduced as compared with the conventional configuration using the frame memory for temporarily storing the image signal. Further, power consumption can be reduced as compared with a conventional configuration using a frame memory for temporarily storing image signals.
- FIG. 3 is a circuit diagram showing a configuration of a pixel region of the display panel according to the first embodiment of the present invention.
- BRIEF DESCRIPTION OF THE DRAWINGS It is for demonstrating the 1st example of operation
- FIG. 7 is a timing chart showing a waveform of a source signal corresponding to high gradation, for explaining a second operation example of the display panel according to the first embodiment of the present invention.
- b) is a timing chart showing the waveform of the gate signal
- (c) is a timing chart showing the common potential and the potential of the pixel electrode
- (d) is a timing chart showing the waveform of the auxiliary capacitance signal. It is.
- FIG. 2 is a timing chart showing a waveform of a source signal corresponding to a low gradation, for explaining a second operation example of the display panel according to the first embodiment of the present invention
- (B) is a timing chart showing the waveform of the gate signal
- (c) is a timing chart showing the common potential and the potential of the pixel electrode
- (d) is a timing showing the waveform of the auxiliary capacitance signal. It is a chart.
- FIG. 9 is a timing chart showing a waveform of a source signal corresponding to a high gradation, for explaining a third operation example of the display panel according to the first embodiment of the present invention.
- b) is a timing chart showing the waveform of the gate signal
- (c) is a timing chart showing the common potential and the potential of the pixel electrode
- (d) is a timing chart showing the waveform of the auxiliary capacitance signal. It is.
- FIG. 9 is a timing chart showing a waveform of a source signal corresponding to a low gradation, for explaining a third operation example of the display panel according to the first embodiment of the present invention.
- (B) is a timing chart showing the waveform of the gate signal
- (c) is a timing chart showing the common potential and the potential of the pixel electrode
- (d) is a timing showing the waveform of the auxiliary capacitance signal. It is a chart.
- FIG. 4 is a diagram for explaining a fourth operation example of the display panel according to the first embodiment of the present invention, in which (a) is a timing chart showing a waveform of a source signal, and (b) is a gate.
- FIG. 6 is a diagram for explaining a fifth operation example of the display panel according to the first embodiment of the present invention, in which (a) is a timing chart showing a waveform of a source signal, and (b) is a gate. 2 is a timing chart showing the waveform of a signal, (c) is a timing chart showing the common potential and the potential of the pixel electrode, and (d) is a timing chart showing the waveform of the auxiliary capacitance signal.
- FIG. 6 is a diagram for explaining a fifth operation example of the display panel according to the first embodiment of the present invention, in which (a) is a timing chart showing a waveform of a source signal, and (b) is a gate. 2 is a timing chart showing the waveform of a signal, (c) is a timing chart showing the common potential and the potential of the pixel electrode, and (d) is a timing chart showing the waveform of the auxiliary capacitance signal.
- FIG. 6 is a diagram for explaining a fifth operation example of the display panel
- FIG. 9 is a diagram for explaining a sixth operation example of the display panel according to the first embodiment of the present invention, in which (a) is a timing chart showing a waveform of a source signal, and (b) is a gate. 2 is a timing chart showing the waveform of a signal, (c) is a timing chart showing the common potential and the potential of the pixel electrode, and (d) is a timing chart showing the waveform of the auxiliary capacitance signal.
- FIG. 2 is a diagram for explaining an operation example of the display panel according to the first embodiment of the present invention, where (a) is a timing chart showing a waveform of a gate signal, and (b) is an auxiliary capacitance signal.
- FIG. 9 is a diagram for explaining a seventh operation example of the display panel according to the first embodiment of the present invention, wherein (a) is a timing chart showing a waveform of a gate signal, and (b) is an auxiliary diagram. It is a timing chart which shows the waveform of a capacity signal.
- FIG. 2 is a diagram for explaining an operation example of the display panel according to the first embodiment of the present invention, wherein (a) is a timing chart showing a waveform of a gate signal, (b) is a common potential, and FIG.
- FIG. 4 is a timing chart showing the potential of the pixel electrode
- FIG. 4C is a timing chart showing the waveform of the auxiliary capacitance signal having a certain duty ratio.
- FIG. 2 is a diagram for explaining an operation example of the display panel according to the first embodiment of the present invention, wherein (a) is a timing chart showing a waveform of a gate signal, (b) is a common potential, and FIG. 4 is a timing chart showing the potential of the pixel electrode, and FIG. 4C is a timing chart showing waveforms of auxiliary capacitance signals having other duty ratios.
- FIG. 2 is a diagram for explaining an operation example of the display panel according to the first embodiment of the present invention, wherein (a) is a timing chart showing a waveform of a gate signal, (b) is a common potential, and FIG. 4C is a timing chart showing an example of the potential of the pixel electrode, FIG.
- FIG. 4C is a timing chart showing an example of the waveform of the auxiliary capacitance signal
- FIG. It is a timing chart which shows an example
- (e) is a timing chart which shows the other example of the waveform of an auxiliary capacity signal.
- FIG. 3 is a block diagram illustrating a configuration of an auxiliary capacitance driver in the display panel according to the first embodiment of the present invention. It is a block diagram which shows the structure of the display panel which concerns on the 2nd Embodiment of this invention.
- FIG. 7 is an explanatory diagram illustrating an operation example of a display panel according to a second embodiment of the present invention, in which (a) is a timing chart showing a waveform of a gate signal, and (b) is an auxiliary capacitance signal.
- Embodiment 1 The configuration of the display panel according to the first embodiment of the present invention will be described with reference to FIG. 1 and FIG.
- FIG. 1 is a block diagram showing a configuration of a display panel 1 according to the present embodiment.
- the display panel 1 is an active matrix type liquid crystal display panel.
- the display panel 1 includes a control unit 11, a source driver 12, a gate driver 13, an auxiliary capacitance driver 14, a counter electrode driver 15, and a display unit 16.
- the control unit 11 includes a control signal # 11a for controlling the source driver 12, a control signal # 11b for controlling the gate driver 13, a control signal # 11c for controlling the auxiliary capacitor driver 14, and a control signal for controlling the counter electrode driver 15. # 11d is output.
- N gate bus lines GL1 to GLN and M source bus lines SL1 to SLM are formed in a lattice shape so as to intersect each other.
- N auxiliary capacitor bus lines CSL1 to CSLN are formed substantially parallel to the N gate bus lines GL1 to GLN.
- the display unit 16 is provided with a counter electrode wiring COML.
- the nth gate bus line is represented as a gate bus line GLn
- the mth source bus line is represented as a source bus line SLm
- the nth auxiliary capacitance bus line is represented as an auxiliary capacitance bus line CSLn.
- the display unit 16 includes a pixel region Pn, m defined by a gate bus line GLn (1 ⁇ n ⁇ N) and a source bus line SLm (1 ⁇ m ⁇ M). ing.
- the source driver 12 is connected to the ends of M source bus lines SL1 to SLM.
- the source driver 12 supplies source signals # SL1 to #SLM to the M source bus lines SL1 to SLM, respectively.
- the gate driver 13 is connected to the ends of N gate bus lines GL1 to GLN.
- the gate driver 13 supplies gate signals # GL1 to #GLN to the N gate bus lines GL1 to GLN, respectively.
- auxiliary capacity driver 14 is connected to the ends of N auxiliary capacity bus lines CSL1 to CSLN.
- the auxiliary capacity driver 14 supplies auxiliary capacity signals # CSL1 to #CSLN to the N auxiliary capacity bus lines CSL1 to CSLN, respectively.
- the counter electrode driver 15 is connected to the end of the counter electrode wiring COML.
- the counter electrode driver 15 supplies a common potential VCOM to the counter electrode wiring COML.
- FIG. 2 is a circuit diagram showing the configuration of the display panel 1 in the pixel region Pn, m.
- the display panel 1 includes a transistor Mn, m having a gate connected to the gate bus line GLn and a source connected to the source bus line SLm in the pixel region Pn, m.
- the transistor Mn, m is, for example, a thin film transistor (TFT: Thin Film Transistor), but the present invention is not limited to a specific type of transistor.
- the transistor Mn, m is an example of a transistor that is in a conductive state when the potential applied to the gate is at a high level and is in a cutoff state when the potential applied to the gate is at a low level.
- the present invention is not limited to this. When the potential applied to the gate is low level, the conductive state is established, and when the potential applied to the gate is high level, the conductive state is established. Even a transistor can be applied to the present invention.
- the pixel electrode PEn, m is connected to the drain of the transistor Mn, m.
- the display panel 1 includes a counter electrode ECOM facing the pixel electrode PEn, m in the pixel region Pn, m, and the counter electrode ECOM is connected to the counter electrode wiring COML.
- the display panel 1 includes a liquid crystal LC between the pixel electrode PEn, m and the counter electrode ECOM, and a pixel capacitor CLC is formed between the pixel electrode PEn, m and the counter electrode ECOM. Yes.
- An electric field is induced between the pixel electrode PEn, m and the counter electrode ECOM according to the electric charge accumulated in the pixel electrode PEn, m, and the orientation of the liquid crystal LC is determined according to the magnitude of the electric field. .
- the orientation of the liquid crystal LC is determined according to the absolute value of the potential difference between the pixel electrode PEn, m and the counter electrode ECOM.
- the transmittance of the liquid crystal LC is determined according to the alignment. In the present embodiment, the case of normally black in which the transmittance of the liquid crystal LC increases as the absolute value of the potential difference increases will be described as an example, but the present invention is not limited to this, and the potential difference is not limited to this.
- the present invention can be applied even in the case of normally white in which the transmittance of the liquid crystal LC becomes smaller as the absolute value of becomes larger. Further, when the transmittance of the liquid crystal LC is further increased, the luminance of the pixel region Pn, m including the liquid crystal LC is further increased.
- the first auxiliary capacitance electrode CE1n, m is connected to the drain of the transistor Mn, m in parallel with the pixel electrode PEn, m.
- the pixel region Pn, m includes a second auxiliary capacitance electrode CE2n, m connected to the auxiliary capacitance bus line CSLn so as to face the first auxiliary capacitance electrode CE1n, m.
- An auxiliary capacitance CCS is formed in parallel with the pixel capacitance CLC between the capacitance electrode CE1n, m and the second auxiliary capacitance electrode CE2n, m.
- the first auxiliary capacitance electrode CE1n, m and the second auxiliary capacitance electrode CE2n, m constitute a capacitor Cn, m having an auxiliary capacitance CCS.
- FIG. 3A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm.
- FIG. 3B is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn.
- FIG. 3C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- FIG. 3D is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn.
- the auxiliary capacitance signal #CSLn is a signal that alternately takes the potential VCS1 and the potential VCS2 with two consecutive vertical scanning periods Tv as one cycle. More specifically, as shown in FIG. 3D, the storage capacitor signal #CSLn takes the potential VCS1 in the period T1 in one vertical scanning period Tv and takes the potential VCS2 in the period T2. Further, the auxiliary capacitance signal #CSLn takes the potential VCS2 in the subsequent period T3 in the vertical scanning period Tv and takes the potential VCS1 in the period T4. As shown in FIG. 3D, specific values of the potential VCS1 and the potential VCS2 satisfy VCS1 ⁇ VCS2.
- the voltage applied to the liquid crystal LC is the potential difference between the potential VPEn, m applied to the pixel electrode PEn, m and the potential VCOM applied to the counter electrode ECOM (the same applies hereinafter).
- one vertical scanning period Tv is defined as including the boundary time at the start of the period but not including the boundary time at the end of the period. That is, in FIG. 3D, one vertical scanning period Tv is defined as a set of time t satisfying t2 ⁇ t ⁇ t5 or a set of time t satisfying t5 ⁇ t ⁇ t8. (Same below).
- the gate signal #GLn rises from a low level to a high level, and falls to a low level after a certain period of time.
- the transistor Mn, m becomes conductive.
- the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the potential VPEn, m applied to the pixel electrode PEn rises from the potential V1 to the potential V2 (V2 is positive).
- the auxiliary capacitance signal #CSLn rises from the potential VCS1 to the potential VCS2.
- the gate signal #GLn is at a low level
- the transistor Mn, m is in a cut-off state. Therefore, the sum of the charge accumulated in the pixel electrode PEn, m and the charge accumulated in the first auxiliary capacitance electrode CE1n, m is unchanged.
- the value of the auxiliary capacitance signal #CSLn changes, the charges accumulated in the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m change.
- the potential VPEn, m of the pixel electrode PEn, m changes from the potential V2 to the potential V3.
- V3 (VCS2-VCS1) x CCS / ⁇ C + V2 It depends on.
- the potential difference between the potential V3 and the common potential VCOM is larger than the potential difference between the potential V2 and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from time t3 to time t4 is larger than the transmittance of the liquid crystal LC in the period from time t2 to time t3. That is, the luminance of the pixel region Pn, m in the period from time t3 to time t4 is larger than the luminance of the pixel region Pn, m in the period from time t2 to time t3.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period.
- the transistor Mn, m is in a conductive state, and the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the auxiliary capacitance signal #CSLn falls from the potential VCS2 to the potential VCS1.
- the gate signal #GLn is at a low level
- the transistor Mn, m is in a cut-off state. Therefore, the sum of the charge accumulated in the pixel electrode PEn, m and the charge accumulated in the first auxiliary capacitance electrode CE1n, m is unchanged.
- the value of the auxiliary capacitance signal #CSLn changes, the charges accumulated in the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m change.
- the potential VPEn, m of the pixel electrode PEn, m changes from the potential V4 to the potential V1.
- the potential difference between the potential V1 and the common potential VCOM is larger than the potential difference between the potential V4 and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t6 to the time t7 is larger than the transmittance of the liquid crystal LC in the period from the time t5 to the time t6. That is, the luminance of the pixel region Pn, m in the period from time t6 to time t7 is larger than the luminance of the pixel region Pn, m in the period from time t5 to time t6.
- the operation after time t7 is the same as the operation after time t1 described above.
- a capacitance parasitic capacitance
- Cgd the drain of the transistor Mn, m and the gate bus line GLn
- a capacitance parasitic capacitance
- the period in which the gate signal #GLn shown in FIG. 3B is at a high level is sufficiently shorter than the one vertical scanning period Tv.
- the display panel 1 includes the plurality of gate bus lines, the gate bus lines GL1 to GLN, the plurality of source bus lines SL1 to SLM, the plurality of auxiliary capacitance bus lines CSL1 to CSLN, A transistor Mn, m comprising a gate connected to an arbitrary gate bus line GLn among a plurality of gate bus lines and a source connected to an arbitrary source bus line SLm among the plurality of source bus lines;
- the pixel electrode PEn, m connected to the drain of the transistor and one end (first auxiliary capacitance electrode CE1n, m) are connected to the drain of the transistor in parallel with the pixel electrode and the other end (second auxiliary capacitance)
- a source driver 12 connected to one end of each bus line and supplying a source signal to the arbitrary
- a display panel including a wiring COML and a counter electrode driver 15 for supplying a common potential VCOM to the counter electrode wiring, wherein the gate driver transmits the conduction signal (to the arbitrary gate bus line).
- One scanning period one vertical scanning period from the supply of the gate signal #GLn to the supply of the next conduction signal In Tv
- at least the first voltage level and the second voltage level different from the first voltage level that is, at least the potential VCS1 and the potential
- the auxiliary capacitance driver 14 is provided for supplying a rectangular voltage signal (auxiliary capacitance signal #CSLn) composed of VCS2).
- auxiliary capacitance signal #CSLn auxiliary capacitance signal composed of VCS2
- the period in which the rectangular voltage signal is at the first voltage level and the period in which the rectangular voltage signal is at the second voltage level, that is, the period T1 and the period T2 are respectively Longer than response time of liquid crystal.
- the display panel 1 can apply a binary voltage level to the pixel electrode connected to the arbitrary gate bus line via the transistor in the one scanning period. That is, the display panel 1 can change the luminance of the image in the pixel region Pn, m in which the pixel electrode PEn, m is formed to binary in the one scanning period.
- the auxiliary capacity driver 14 provided in the display panel 1 according to the present invention can supply the rectangular voltage signal (auxiliary capacity signal #CSLn) in synchronization with the conduction signal. Therefore, unlike the case where the voltage signal is supplied without being synchronized with the conduction signal, the ratio of the display period in the bright luminance and the display period in the dark luminance can be made almost equal at any place on the screen. It is possible to effectively suppress moving image blur.
- the moving image blur can be suppressed without using a frame memory for temporarily storing the image signal. Therefore, the manufacturing cost can be reduced as compared with the conventional configuration using the frame memory for temporarily storing the image signal. Further, power consumption can be reduced as compared with a conventional configuration using a frame memory for temporarily storing image signals.
- the rectangular voltage signal (auxiliary capacitance signal #CSLn) is the first voltage level or the second voltage level in the continuous period of at least 10 percent of the one scanning period.
- the voltage level of one value (that is, the voltage level of one of the potential VCS1 and the potential VCS2) is taken.
- the rectangular voltage signal (auxiliary capacitance signal #CSLn) has a period of approximately 10% of the one scanning period from the start of the one scanning period (one vertical scanning period Tv). Until one period of the first voltage level or the second voltage level (potential VCS1) is reached and approximately 90% of the one scanning period has elapsed, and then the one scanning period. In the period until the operation ends, the other voltage level (potential VCS2) of the first voltage level or the second voltage level is taken.
- FIG. 4A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm.
- the potential of the source signal #SLm when the conduction signal #GLn is high and the auxiliary capacitance bus line #CSLn is low is 3 is lower than the potential of the waveform shown in FIG. 3A, or when the conduction signal #GLn is at a high level and the auxiliary capacitance bus line #CSLn is at a high level.
- the potential of #SLm is higher than the potential of the waveform shown in FIG.
- FIG. 4B is a timing chart showing a waveform of the gate signal #GLn supplied to the gate bus line GLn, which is the same waveform as FIG. 3B.
- FIG. 4C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- (D) of FIG. 4 is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn, which is the same waveform as (d) of FIG.
- the gate signal #GLn rises from a low level to a high level, and falls to a low level after a predetermined period.
- the relative potential of the source signal #SLm with respect to the common potential VCOM is substantially equal to the potential of the pixel electrode PEn, m in the period from time t1 to time t2.
- the potential VPEn, m of the pixel electrode PEn, m remains almost unchanged at the potential V01.
- the auxiliary capacitance signal #CSLn rises from the potential VCS1 to the potential VCS2. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V01 to the potential V02.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period.
- the relative potential of the source signal #SLm with respect to the common potential VCOM is substantially equal to the potential VPEn, m of the pixel electrode PEn, m during the period from time t4 to time t5.
- the potential VPEn, m of the pixel electrode PEn, m remains almost unchanged at the potential V02.
- the auxiliary capacitance signal #CSLn falls from the potential VCS2 to the potential VCS1. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from, for example, the potential V02 to the potential V01.
- the operation after time t7 is the same as the operation after time t1 described above.
- the absolute value of the potential difference between the potential VPEn, m of the pixel electrode PEn, m and the common potential VCOM is always kept substantially constant throughout the period. That is, when the source signal #SLm corresponding to the low gradation is supplied, even if the value of the auxiliary capacitance signal #CSLn is changed as shown in FIG.
- the transmittance of the liquid crystal LC provided can be kept substantially constant.
- the liquid crystal when the rectangular voltage signal (auxiliary capacitance signal #CSLn) is at the first voltage level.
- the polarity of the voltage applied to the liquid crystal and the polarity of the voltage applied to the liquid crystal when the rectangular voltage signal is at the second voltage level are different from each other. That is, the voltage applied to the liquid crystal expressed by the difference between the potential V01 of the pixel electrode PEn, m and the potential VCOM of the counter electrode when the auxiliary capacitance signal #CSLn is the potential VCS1, and the auxiliary capacitance signal #CSLn is the potential VCS2.
- the voltage applied to the liquid crystal expressed by the difference between the potential V02 of the pixel electrode PEn, m and the potential VCOM of the counter electrode is opposite to each other.
- the absolute value of the potential difference between the first voltage level and the second voltage level is not more than twice the threshold voltage of the liquid crystal. That is, the absolute value of the potential difference between the potential VCS1 and the potential VCS2 is preferably not more than twice the threshold voltage of the liquid crystal.
- the orientation of the liquid crystal is not affected even when a voltage lower than the threshold voltage is applied to the liquid crystal.
- the threshold voltage is a voltage at which the alignment of the liquid crystal starts to be affected (the same applies hereinafter).
- the threshold voltage can be defined as, for example, a voltage that is 1 / 100th of the saturation voltage at which the transmittance of the liquid crystal is saturated.
- the potential of the auxiliary capacitance signal #CSLn is the potential VCS1
- the voltage applied to the liquid crystal expressed by the difference between the potential of the pixel electrode PEn, m and the potential VCOM of the counter electrode, and the potential of the auxiliary capacitance signal #CSLn are the potential.
- ⁇ VLC (VCS2 ⁇ VCS1) ⁇ CCS / ⁇ C Meet.
- VLC ⁇ VLC / 2
- VLC ⁇ VLC / 2
- VCS2-VCS1 ⁇ 2 ⁇ VLCth black display can be performed regardless of whether the potential of the auxiliary capacitance signal #CSLn is the potential VCS1 or the potential VCS2.
- the voltage level of the rectangular voltage signal is the first level. Black display can be performed regardless of the voltage level or the second voltage level.
- FIG. 5A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm.
- the waveform is the same as the waveform of the source signal #SLm shown in FIG. is there.
- FIG. 5B is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn. As shown in FIG. 5B, the description will be made assuming that the waveform of the gate signal #GLn in this operation example is the same as the waveform of the gate signal #GLn shown in FIG.
- FIG. 5C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- FIG. 5 is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn.
- the auxiliary capacitance signal #CSLn in this operation example has the potential VCS1 ′, the potential VCS2 ′, and the potential VCS3 ′ with two consecutive vertical scanning periods Tv ′ as one cycle. It is a signal to take. More specifically, as shown in FIG. 5D, the auxiliary capacitance signal #CSLn takes the potential VCS2 ′ in the period T1 ′ in one vertical scanning period Tv ′ and takes the potential VCS3 ′ in the period T2 ′. .
- the auxiliary capacitance signal #CSLn takes the potential VCS2 'in the subsequent period T3' in the vertical scanning period Tv 'and takes the potential VCS1' in the period T4 '.
- specific values of the potential VCS1 ', the potential VCS2', and the potential VCS2 ' satisfy VCS1' ⁇ VCS2 ' ⁇ VCS3'.
- the gate signal #GLn rises from a low level to a high level, and falls to a low level after a certain period of time.
- the transistor Mn, m becomes conductive.
- the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the auxiliary capacitance signal #CSLn rises from the potential VCS1 ′ to the potential VCS2 ′.
- the gate signal #GLn is at a low level
- the transistor Mn, m is in a cut-off state. Therefore, the sum of the charge accumulated in the pixel electrode PEn, m and the charge accumulated in the first auxiliary capacitance electrode CE1n, m is unchanged.
- the value of the auxiliary capacitance signal #CSLn changes, the charges accumulated in the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m change.
- the potential VPEn, m of the pixel electrode PEn, m changes from the potential V2 ′ to the potential V3 ′.
- the auxiliary capacitance signal #CSLn rises from the potential VCS2 ′ to the potential VCS3 ′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V3 ′ to the potential V4 ′.
- the potential difference between the potential V4 'and the common potential VCOM is larger than the potential difference between the potential V3' and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t3 'to the time t4' is larger than the transmittance of the liquid crystal LC in the period from the time t2 'to the time t3'. That is, the luminance of the pixel region Pn, m in the period from time t3 'to time t4' is larger than the luminance of the pixel region Pn, m in the period from time t2 'to time t3'.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period.
- the transistor Mn, m is in a conductive state, and the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the auxiliary capacitance signal #CSLn falls from the potential VCS3 ′ to the potential VCS2 ′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V5 ′ to the potential V6 ′.
- the auxiliary capacitance signal #CSLn falls from the potential VCS2 ′ to the potential VCS1 ′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V6 ′ to the potential V1 ′.
- the potential difference between the potential V1 'and the common potential VCOM is larger than the potential difference between the potential V6' and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t6 'to the time t7' is larger than the transmittance of the liquid crystal LC in the period from the time t5 'to the time t6'. That is, the luminance of the pixel region Pn, m in the period from time t6 'to time t7' is larger than the luminance of the pixel region Pn, m in the period from time t5 'to time t6'.
- the operation after time t7 ' is the same as the operation after time t1' described above.
- the auxiliary capacitance signal #CSLn rises from the potential VCS1 ′ to the potential VCS2 ′ at time t2 ′, and the auxiliary capacitance signal #CSLn changes from the potential VCS3 ′ to the potential VCS2 ′ at time t5 ′.
- the auxiliary capacitance signal #CSLn is generated from the potential VCS1 ′ during a period of several horizontal periods (multiple times of the horizontal period Th) from the time t2 ′.
- the potential rises to the potential VCS2 ′, and falls from the potential VCS3 ′ to the potential VCS2 ′ from the time t5 ′ to the passage of several horizontal periods (a period that is a multiple of the horizontal period Th).
- the auxiliary capacitance driver 14 synchronizes with the conduction signal with respect to the arbitrary auxiliary capacitance bus line in the one scanning period (one vertical scanning period Tv ′).
- a rectangular voltage signal (auxiliary capacitance signal #CSLn) having a second voltage level, a third voltage level different from any of the first voltage level and the second voltage level. Supply.
- the auxiliary capacitor driver 14 has a rectangular voltage signal (the potential VCS1 ′, the potential VCS2 ′, and the potential VCS3 ′) in one vertical scanning period (one vertical scanning period Tv ′).
- Auxiliary capacitance signal #CSLn is supplied.
- the voltage level applied to the arbitrary auxiliary capacitance bus line changes to three values.
- the voltage level applied to the storage capacitor bus line transitions twice in the one scanning period.
- the voltage applied to the liquid crystal after the first transition of the voltage level by the first transition of the voltage level in the one scanning period is suitable for display after the first transition of the voltage level. It is possible to switch between high luminance and low luminance by the second transition of the voltage level.
- the gate driver 13 supplies the conduction signal (the high level period of the gate signal #GLn) to the arbitrary gate bus line GLn, the arbitrary auxiliary capacitance bus line CSLn.
- the auxiliary capacitance driver 14 applies the one scanning period (one vertical scanning period) to the arbitrary auxiliary capacitance bus line CSLn.
- Tv ′ the rectangular voltage signal #CSLn whose voltage level is in ascending order is supplied.
- the auxiliary capacitor driver 14 applies the auxiliary capacitor bus line CSLn from time t2 ′ to time t3 ′ in one scanning period (one vertical scanning period Tv ′) from time t2 ′ to time t5 ′.
- the storage capacitor signal #CSLn is supplied in the period T1 ′, which takes the voltage level VCS2 ′, and in the period T2 ′ from the time t3 ′ to the time t5 ′, which takes the voltage level VCS3 ′ (VCS2 ′ ⁇ VCS3 ′).
- the rise from low luminance to high luminance is not possible due to the fact that the response of the liquid crystal has a finite time.
- a sufficient phenomenon occurs.
- the time required for the change from low luminance to high luminance is longer than the time required for the change from high luminance to low luminance.
- the above phenomenon can occur at the timing when the potential of the pixel electrode changes to a high voltage when the signal applied to the pixel electrode is positive.
- the gate driver when the gate driver supplies the conduction signal to the arbitrary gate bus line, the lowest voltage level among the voltage levels is set to the arbitrary auxiliary capacitance bus line.
- a voltage signal having a lower voltage level can be supplied to the pixel electrode in the one scanning period, and a voltage signal having a higher voltage level can be subsequently supplied.
- the potential applied to the pixel electrode can be gradually changed to a high voltage. As a result, the phenomenon that the rise from the low luminance to the high luminance, which may occur in the normally black method, becomes insufficient can be suppressed.
- the gate driver 13 supplies the conduction signal (the high level period of the gate signal #GLn) to the arbitrary gate bus line GLn, the arbitrary auxiliary capacitance bus line CSLn.
- the auxiliary capacitance driver 14 applies the voltage level to the arbitrary auxiliary capacitance bus line CSLn in the one scanning period. Supplies the rectangular voltage signal in descending order.
- the auxiliary capacitor driver 14 performs the time from the time t5 ′ to the time t6 ′ on the auxiliary capacitor bus line CSLn in one scanning period (one vertical scanning period Tv ′) from the time t5 ′ to the time t8 ′.
- the auxiliary capacitance signal #CSLn is supplied in the period T3 ′, which takes the voltage level VCS2 ′, and in the period T4 ′ from time t6 ′ to time t8 ′, which takes the voltage level VCS1 ′ (VCS1 ′ ⁇ VCS2 ′).
- the rise from low luminance to high luminance is not possible due to the fact that the response of the liquid crystal has a finite time.
- a sufficient phenomenon occurs.
- the time required for the change from low luminance to high luminance is longer than the time required for the change from high luminance to low luminance.
- the above phenomenon may occur at the timing when the potential of the pixel electrode changes to a low voltage when the signal applied to the pixel electrode has a negative polarity.
- the gate driver when the gate driver supplies the conduction signal to the arbitrary gate bus line, the highest voltage level among the voltage levels is set to the arbitrary auxiliary capacity bus line.
- a voltage signal having a higher voltage level can be supplied to the pixel electrode in the one scanning period, and subsequently, a voltage signal having a lower voltage level can be supplied.
- the potential applied to the pixel electrode can be gradually changed to a lower voltage. As a result, the phenomenon that the rise from the low luminance to the high luminance, which may occur in the normally black method, becomes insufficient can be suppressed.
- FIG. 6A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm.
- the potential of the source signal #SLm when the conduction signal #GLn is high and the auxiliary capacitance bus line #CSLn is low is 3 is lower than the potential of the waveform shown in FIG. 3A, or when the conduction signal #GLn is at a high level and the auxiliary capacitance bus line #CSLn is at a high level.
- the potential of #SLm is higher than the potential of the waveform shown in FIG.
- FIG. 6B is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn, which is the same waveform as FIG. 3B.
- FIG. 6C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- FIG. 6D is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn, which is the same waveform as that shown in FIG.
- the gate signal #GLn rises from a low level to a high level, and falls to a low level after a certain period.
- the potential VPEn, m applied to the pixel electrode PEn falls from, for example, the potential V01 ′ to the potential V02 ′. .
- the auxiliary capacitance signal #CSLn rises from the potential VCS1' to the potential VCS2 '. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V02 'to, for example, the potential V01'.
- the auxiliary capacitance signal #CSLn rises from the potential VCS2 ′ to the potential VCS3 ′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V01 ′ to the potential V03 ′.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period.
- the potential VPEn, m applied to the pixel electrode PEn rises from the potential V03 'to the potential V04'.
- the auxiliary capacitance signal #CSLn falls from the potential VCS3' to the potential VCS2 '. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V04 'to, for example, the potential V03'.
- the auxiliary capacitance signal #CSLn falls from the potential VCS2' to the potential VCS1 '. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V03 'to the potential V01'.
- the operation after time t7 ' is the same as the operation after time t1' described above.
- the absolute value of the potential difference between the potential VPEn, m of the pixel electrode PEn, m and the common potential VCOM is always kept substantially constant throughout the period. That is, even when the value of the auxiliary capacitance signal #CSLn is changed as shown in FIG. 6D, the transmittance of the liquid crystal LC included in the pixel region Pn, m can be kept substantially constant.
- the polarity of the voltage applied to the liquid crystal after the first transition of the voltage level and the transition after the next transition of the voltage level are performed.
- the polarity of the voltage applied to the liquid crystal is different from each other.
- the voltage applied to the liquid crystal expressed by the difference between the potential V01 'of the pixel electrode PEn, m and the potential VCOM of the counter electrode when the auxiliary capacitance signal #CSLn is the potential VCS2', and the auxiliary capacitance signal #CSLn is the potential VCS3 '.
- the voltage applied to the liquid crystal expressed by the difference between the potential V03 ′ of the pixel electrode PEn, m and the potential VCOM of the counter electrode is opposite to each other.
- the absolute value of the voltage applied to the liquid crystal is sufficiently set in the one scanning period even after the first voltage level transition or after the next voltage level transition. Can be made smaller.
- an intermediate voltage level, the first voltage level, the second voltage level among the first voltage level, the second voltage level, and the third voltage level are selected.
- the absolute value of the potential difference from the highest voltage level is preferably not more than twice the threshold voltage of the liquid crystal. That is, in this operation example, the absolute value of the potential difference between the intermediate voltage level VCS2 ′ and the highest voltage level VCS3 ′ among the potentials VCS1 ′, VCS2 ′, and VCS3 ′ is 2 of the threshold voltage of the liquid crystal. It is preferable that it is less than twice.
- an intermediate voltage level, the first voltage level, and the second voltage among the first voltage level, the second voltage level, and the third voltage level The absolute value of the potential difference from the highest voltage level among the level and the third voltage level is not more than twice the threshold voltage of the liquid crystal, that is, in this operation example, the potential VCS1 ′, the potential Since the absolute value of the potential difference between the intermediate voltage level VCS2 ′ and the highest voltage level VCS3 ′ among the VCS2 ′ and the potential VCS3 ′ is less than twice the threshold voltage of the liquid crystal, the rectangular voltage signal The alignment of the liquid crystal is not affected regardless of the voltage level of the first voltage level, the second voltage level, or the third voltage level. Can do.
- Black display in the normally black method in which the luminance is lower when the absolute value of the voltage applied to the liquid crystal is smaller, the voltage level of the rectangular voltage signal is the first voltage level, Black display can be performed at any of the second voltage level and the third voltage level.
- FIG. 7A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm. As shown in FIG. 7A, the description will be made assuming that the waveform of the source signal #SLm in this operation example is the same as the waveform of the source signal #SLm shown in FIG.
- FIG. 7B is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn. As shown in FIG. 7B, the description will be made assuming that the waveform of the gate signal #GLn in this operation example is the same as the waveform of the gate signal #GLn shown in FIG.
- FIG. 7C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- FIG. 7 is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn.
- the storage capacitor signal #CSLn in this operation example has a potential VCS1 ′′, a potential VCS2 ′′, a potential VCS3 ′ with two consecutive vertical scanning periods Tv ′′ as one cycle.
- the auxiliary capacitance signal #CSLn takes the potential VCS2 ′′ in the period T1 ′′ in one vertical scanning period Tv ′′ and the potential in the period T2 ′′. Take VCS3 ''.
- the auxiliary capacitance signal #CSLn takes the potential VCS4 ′′ in the subsequent period T3 ′′ in the vertical scanning period Tv ′ and takes the potential VCS1 ′′ in the period T4 ′′.
- specific values of the potential VCS1 ′′, the potential VCS2 ′′, the potential VCS3 ′′, and the potential VCS4 ′′ are VCS1 ′′ ⁇ VCS2 ′′ ⁇ VCS4. It is assumed that “ ⁇ VCS3” and VCS2 ′′ ⁇ VCS1 ′′ ⁇ VCS3 ′′ ⁇ VCS2 ′′ and VCS3 ′′ ⁇ VCS4 ′′ ⁇ VCS4 ′′ ⁇ VCS1 ′′ are satisfied.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a certain period.
- the transistor Mn, m becomes conductive.
- the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the potential VPEn, m applied to the pixel electrode PEn, m during the period from the time t1 ′′ to the time t2 ′′ is from the potential V1 ′′ to the potential V2 ′′ ( V2 '' stands up to positive).
- the auxiliary capacitance signal #CSLn rises from the potential VCS1 ′′ to the potential VCS2 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V2 ′′ to the potential V3 ′′.
- the auxiliary capacitance signal #CSLn rises from the potential VCS2 ′′ to the potential VCS3 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V3 ′′ to the potential V4 ′′.
- the potential difference between the potential V4 ′′ and the common potential VCOM is larger than the potential difference between the potential V3 ′′ and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t3 ′′ to the time t4 ′′ is larger than the transmittance of the liquid crystal LC in the period from the time t2 ′′ to the time t3 ′′. That is, the luminance of the pixel region Pn, m in the period from time t3 ′′ to time t4 ′′ is larger than the luminance of the pixel region Pn, m in the period from time t2 ′′ to time t3 ′′.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a certain period.
- the transistor Mn, m is in a conductive state, and the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the potential VPEn, m applied to the pixel electrode PEn, m during the period from the time t4 ′′ to the time t5 ′′ is from the potential V4 ′′ to the potential V5 ′′ ( V5 '' falls to negative).
- the auxiliary capacitance signal #CSLn falls from the potential VCS3 ′′ to the potential VCS4 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V5 ′′ to the potential V6 ′′.
- the auxiliary capacitance signal #CSLn falls from the potential VCS4 ′′ to the potential VCS1 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V6 ′′ to the potential V1 ′′.
- the potential difference between the potential V1 ′′ and the common potential VCOM is larger than the potential difference between the potential V6 ′′ and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t6 ′′ to the time t7 ′′ is larger than the transmittance of the liquid crystal LC in the period from the time t5 ′′ to the time t6 ′′. That is, the luminance of the pixel region Pn, m in the period from time t6 ′′ to time t7 ′′ is greater than the luminance of the pixel region Pn, m in the period from time t5 ′′ to time t6 ′′.
- the operation after time t7 ′′ is the same as the operation after time t1 ′′ described above.
- the auxiliary capacitance signal #CSLn rises from the potential VCS1 ′′ to the potential VCS2 ′′ at time t2 ′′, and the auxiliary capacitance signal #CSLn becomes the potential VCS3 ′ at time t5 ′′.
- the auxiliary capacitance signal #CSLn is used until several horizontal periods (multiple times the horizontal period Th) elapse from time t2 ′′.
- the auxiliary capacitor driver 14 synchronizes with the conduction signal with respect to the arbitrary auxiliary capacitor bus line CSLn in the one scanning period (vertical scanning period Tv ′′).
- a rectangular voltage signal having a voltage level of 1, a second voltage level, and a third voltage level different from any of the first voltage level and the second voltage level;
- any two voltage levels of the first voltage level, the second voltage level, and the third voltage level are A rectangular voltage signal (auxiliary capacitance signal #CSLn) comprising the first voltage level, the second voltage level, and a fourth voltage level different from any of the third voltage levels is supplied. .
- the auxiliary capacitor driver 14 is a rectangular voltage composed of the potential VCS1 ′′, the potential VCS2 ′′, the potential VCS3 ′′, and the potential VCS4 ′′ in two consecutive vertical scanning periods.
- a signal (auxiliary capacitance signal #CSLn) is supplied.
- the auxiliary capacitor driver 14 synchronizes the first voltage level and the second voltage with respect to the arbitrary auxiliary capacitor bus line in synchronization with the conduction signal in the one scanning period. And a rectangular voltage signal having a third voltage level that is different from any of the first voltage level and the second voltage level can be supplied.
- the voltage level applied to any auxiliary capacitance bus line changes to a ternary value. In other words, the voltage level applied to the storage capacitor bus line transitions twice in the one scanning period.
- the voltage applied to the liquid crystal after the first transition of the voltage level by the first transition of the voltage level in the one scanning period is suitable for display after the first transition of the voltage level. It is possible to switch between high luminance and low luminance by the second transition of the voltage level.
- any one of the first voltage level, the second voltage level, and the third voltage level in one scanning period following the one scanning period is selected. Since a rectangular voltage signal comprising a voltage level and a fourth voltage level different from any of the first voltage level, the second voltage level, and the third voltage level can be supplied. Compared to a case where a rectangular voltage signal composed of the first voltage level, the second voltage level, and the third voltage level is supplied in one scanning period following the one scanning period. In addition, the brightness levels of high brightness and low brightness can be adjusted more flexibly.
- VCS2 ′′ ⁇ VCS1 ′′ before and after the first transition of the voltage level in the one scanning period (vertical scanning period Tv ′′).
- represents the absolute value of a.
- the change in the luminance of the pixel region Pn, m accompanying the transition of the voltage level of the auxiliary capacitance signal #CSLn at time t3 ′′ can be increased while maintaining the effect of increasing the luminance.
- the moving image blur phenomenon can be more effectively suppressed.
- Tv ′′ from time t5 ′′ to time t8 ′′.
- FIG. 8A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm, which is the same waveform as that of FIG.
- FIG. 8B is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn. As shown in FIG. 8B, description will be made assuming that the waveform of the gate signal #GLn in this operation example is the same as the waveform of the gate signal #GLn shown in FIG.
- FIG. 8C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- (D) of FIG. 8 is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn, and is the same waveform as (d) of FIG.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a certain period.
- the potential VPEn, m applied to the pixel electrode PEn, m during the period from time t1 ′′ to time t2 ′′ is from potential V01 ′′ to potential V02 ′′. Fall down.
- the auxiliary capacitance signal #CSLn rises from the potential VCS1 ′′ to the potential VCS2 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V2 ′′ to, for example, the potential V01 ′′.
- the auxiliary capacitance signal #CSLn rises from the potential VCS2 ′′ to the potential VCS3 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V01 ′′ to the potential V03 ′′.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a certain period.
- the potential VPEn, m applied to the pixel electrode PEn, m from the time t4 ′′ to the time t5 ′′ is from the potential V03 ′′ to the potential V04 ′′. stand up.
- the auxiliary capacitance signal #CSLn falls from the potential VCS3 ′′ to the potential VCS4 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V04 ′′ to, for example, the potential V03 ′′.
- the auxiliary capacitance signal #CSLn falls from the potential VCS4 ′′ to the potential VCS1 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V03 ′′ to, for example, the potential V01 ′′.
- the operation after time t7 ′′ is the same as the operation after time t1 ′′ described above.
- the absolute value of the potential difference between the potential VPEn, m of the pixel electrode PEn, m and the common potential VCOM is always kept substantially constant throughout the entire period. That is, even when the value of the auxiliary capacitance signal #CSLn is changed as shown in FIG. 8D, the transmittance of the liquid crystal LC included in the pixel region Pn, m can be kept substantially constant.
- the liquid crystal represented by the difference between the potential of the pixel electrode and the potential of the counter electrode after the first transition of the voltage level in the one scanning period 1 vertical scanning period Tv ′′, the liquid crystal represented by the difference between the potential of the pixel electrode and the potential of the counter electrode after the first transition of the voltage level.
- the polarity of the voltage applied to the liquid crystal and the polarity of the voltage applied to the liquid crystal expressed by the difference between the potential of the pixel electrode and the potential of the counter electrode after the next transition of the voltage level are different from each other It is.
- the voltage applied to the liquid crystal expressed by the difference between the potential V01 ′′ of the pixel electrode PEn, m and the potential VCOM of the counter electrode when the auxiliary capacitance signal #CSLn is the potential VCS2 ′′, and the auxiliary capacitance signal # The voltages applied to the liquid crystal expressed by the difference between the potential V03 ′′ of the pixel electrode PEn, m when the CSLn is the potential VCS3 ′′ and the potential VCOM of the counter electrode have opposite polarities.
- the absolute value of the voltage applied to the liquid crystal is sufficiently set in the one scanning period even after the first voltage level transition or after the next voltage level transition. Can be made smaller.
- the second lowest voltage level among the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level, and the first voltage level is not more than twice the threshold voltage of the liquid crystal It is preferable that That is, in this operation example, the second lowest voltage level VCS2 ′′ and the highest voltage level VCS3 ′′ among the potential VCS1 ′′, the potential VCS2 ′′, the potential VCS3 ′′, and the potential VCS4 ′′.
- the absolute value of the potential difference is preferably not more than twice the threshold voltage of the liquid crystal.
- the second lowest voltage level among the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level, and the first voltage level The absolute value of the potential difference from the highest voltage level among the second voltage level, the second voltage level, the third voltage level, and the fourth voltage level is not more than twice the threshold voltage of the liquid crystal. It is preferable that there is. That is, in this operation example, the second lowest voltage level VCS2 ′′ and the highest voltage level VCS3 ′′ among the potential VCS1 ′′, the potential VCS2 ′′, the potential VCS3 ′′, and the potential VCS4 ′′.
- the absolute value of the potential difference with respect to the liquid crystal is less than or equal to twice the threshold voltage of the liquid crystal, so that the orientation of the liquid crystal is the same regardless of the voltage level of the third voltage level or the fourth voltage level. It can be made unaffected.
- Black display can be performed at any of the second voltage level, the third voltage level, and the fourth voltage level.
- FIG. 9A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm. As shown in FIG. 9A, the description will be made assuming that the waveform of the source signal #SLm in this operation example is substantially the same as the waveform of the source signal #SLm shown in FIG.
- FIG. 9 is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn. As shown in FIG. 9B, the description will be made assuming that the waveform of the gate signal #GLn in this operation example is the same as the waveform of the gate signal #GLn shown in FIG.
- FIG. 9C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- FIG. 9 is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn.
- the storage capacitor signal #CSLn in this operation example is a signal that takes the potentials VCS11 and VCS12 with two consecutive vertical scanning periods Tv as one cycle. More specifically, as shown in FIG. 9D, the auxiliary capacitance signal #CSLn takes the potential VCS12 in the period T11 in one vertical scanning period Tv, and the potential VCS11 in the period T12 from the time t13 to the time t14. Thus, the potential VCS12 is taken from the time t14 to the time t15 in the period T12.
- the auxiliary capacitance signal #CSLn takes the potential VCS11 in the period T13 in the subsequent vertical scanning period Tv, takes the potential VCS12 in the period T14 from the time t16 to the time t17, and takes the potential VCS11 in the period T14 from the time t17 to the time t18. Take. As shown in FIG. 9D, specific values of the potential VCS11 and the potential VCS12 satisfy VCS11 ⁇ VCS12.
- the gate signal #GLn rises from a low level to a high level, and falls to a low level after a certain period.
- the transistor Mn, m becomes conductive.
- the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the potential VPEn, m applied to the pixel electrode PEn rises from the potential V11 to the potential V12 (V12 is positive).
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 to the potential VCS12. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V12 to the potential V13.
- the auxiliary capacitance signal #CSLn falls from the potential VCS12 to the potential VCS11. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V13 to the potential V12.
- the potential difference between the potential V13 and the common potential VCOM is larger than the potential difference between the potential V12 and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t12 to the time t13 is larger than the transmittance of the liquid crystal LC in the period from the time t13 to the time t14. That is, the luminance of the pixel region Pn, m in the period from time t12 to time t13 is larger than the luminance of the pixel region Pn, m in the period from time t13 to time t14.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period.
- the transistor Mn, m is in a conductive state, and the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 to the potential VCS12.
- the potential VPEn, m applied to the pixel electrode PEn falls from the potential V12 to, for example, the potential V11.
- the auxiliary capacitance signal #CSLn falls from the potential VCS12 to the potential VCS11. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V11 to the potential V14.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 to the potential VCS12. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V14 to the potential V11.
- the potential difference between the potential V14 and the common potential VCOM is larger than the potential difference between the potential V11 and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t15 to the time t16 is larger than the transmittance of the liquid crystal LC in the period from the time t16 to the time t17. That is, the luminance of the pixel region Pn, m in the period from time t15 to time t16 is larger than the luminance of the pixel region Pn, m in the period from time t16 to time t17.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period. Further, the auxiliary capacitance signal #CSLn falls from the potential VCS12 to the potential VCS11.
- the operation after time t17 is the same as the operation after time t11 described above.
- auxiliary capacitance signal #CSLn rises from the potential VCS11 to the potential VCS12 at time t12 and falls from the potential VCS12 to the potential VCS11 at time t15 has been described.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 to the potential VCS12 from the time t12 until several horizontal periods (multiple times the horizontal period Th) elapse, and from the time t15 for several horizontal periods (horizontal period Th).
- the potential falls from the potential VCS12 to the potential VCS11 until a period of a plurality of times elapses.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 to the potential VCS12 at time t14 has been described, but more generally, the auxiliary capacitance signal #CSLn is It rises from the potential VCS11 to the potential VCS12 during t15.
- the luminance of the pixel region Pn, m in the second half of one vertical scanning period is smaller than the luminance of the pixel region Pn, m in the first half of the one vertical scanning period.
- FIG. 10A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm. As shown in FIG. 10A, the description will be made assuming that the waveform of the source signal #SLm in this operation example is substantially the same as the waveform of the source signal #SLm shown in FIG.
- FIG. 10B is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn. As shown in FIG. 10B, the description will be made assuming that the waveform of the gate signal #GLn in this operation example is substantially the same as the waveform of the gate signal #GLn shown in FIG.
- FIG. 10C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- FIG. 10 (D) of FIG. 10 is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn.
- the auxiliary capacitance signal #CSLn in this operation example has the potential VCS11 ′, the potential VCS12 ′, and the potential VCS13 ′ as one cycle of two consecutive vertical scanning periods Tv ′. It is a signal to take. More specifically, as shown in FIG. 10 (d), the storage capacitor signal #CSLn takes the potential VCS12 'in the period T11' in one vertical scanning period Tv 'and starts from the time t13' in the period T12 '.
- the potential VCS13 ′ is taken at t14 ′, and the potential VCS12 ′ is taken from time t14 ′ to time t15 ′ in the period T12 ′. Further, the auxiliary capacitance signal #CSLn takes the potential VCS11 ′ in the subsequent period T13 ′ in the vertical scanning period Tv ′, takes the potential VCS13 ′ in the period T14 ′ from the time t16 ′ to the time t17 ′, and takes the time in the period T14 ′.
- the potential VCS11 ' is taken from t17' to time t18 '. As shown in FIG. 10D, specific values of the potential VCS11 ', the potential VCS12', and the potential VCS13 'satisfy VCS11' ⁇ VCS13 ' ⁇ VCS12'.
- the gate signal #GLn rises from a low level to a high level, and falls to a low level after a certain period of time.
- the transistor Mn, m becomes conductive.
- the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 ′ to the potential VCS12 ′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V12 ′ to the potential V13 ′.
- the auxiliary capacitance signal #CSLn falls from the potential VCS12 ′ to the potential VCS13 ′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V13 ′ to the potential V14 ′.
- the potential difference between the potential V13 'and the common potential VCOM is larger than the potential difference between the potential V14' and the common potential VCOM. That is, the transmittance of the liquid crystal LC during the period from the time t12 'to the time t13' is larger than the transmittance of the liquid crystal LC during the period from the time t13 'to the time t14'. That is, the luminance of the pixel region Pn, m in the period from time t12 'to time t13' is larger than the luminance of the pixel region Pn, m in the period from time t13 'to time t14'.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period.
- the transistor Mn, m is in a conductive state, and the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the auxiliary capacitance signal #CSLn rises from the potential VCS13' to the potential VCS12 '.
- the auxiliary capacitance signal #CSLn falls from the potential VCS12 ′ to the potential VCS11 ′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V15 ′ to the potential V16 ′.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11' to the potential VCS13 '. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V16 'to the potential V11'.
- the potential difference between the potential V16 'and the common potential VCOM is larger than the potential difference between the potential V11' and the common potential VCOM. That is, the transmittance of the liquid crystal LC in the period from the time t15 'to the time t16' is larger than the transmittance of the liquid crystal LC in the period from the time t16 'to the time t17'. That is, the luminance of the pixel region Pn, m in the period from time t15 'to time t16' is larger than the luminance of the pixel region Pn, m in the period from time t16 'to time t17'.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a predetermined period. Further, the auxiliary capacitance signal #CSLn falls from the potential VCS12 'to the potential VCS11'.
- the operation after time t17 ' is the same as the operation after time t11' described above.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 ′ to the potential VCS12 ′ at time t12 ′ and falls from the potential VCS12 ′ to the potential VCS11 ′ at time t15 ′. More generally, the auxiliary capacitance signal #CSLn rises from the potential VCS11 ′ to the potential VCS12 ′ from the time t12 ′ until several horizontal periods (multiple times of the horizontal period Th) elapse. The voltage falls from the potential VCS12 ′ to the potential VCS11 ′ until several horizontal periods (multiple times the horizontal period Th) elapse from t15 ′.
- auxiliary capacitance signal #CSLn rises from the potential VCS13 ′ to the potential VCS12 ′ at time t14 ′. More generally, however, the auxiliary capacitance signal #CSLn Between the time t13 'and the time t15', the potential rises from the potential VCS13 'to the potential VCS12'.
- the luminance of the pixel region Pn, m in the second half of one vertical scanning period is smaller than the luminance of the pixel region Pn, m in the first half of the one vertical scanning period.
- the phenomenon of the moving image blur can be suppressed.
- the auxiliary capacitance signal #CSLn takes a ternary voltage level. Therefore, as compared with the above-described operation example 4, it is possible to perform display with high luminance while maintaining the effect of suppressing the moving image blur phenomenon.
- FIG. 11A is a timing chart showing an example of the waveform of the source signal #SLm supplied to the source bus line SLm. As shown in (a) of FIG. 11, description will be made assuming that the waveform of the source signal #SLm in this operation example is substantially the same as the waveform of the source signal #SLm shown in (a) of FIG. 3.
- FIG. 11B is a timing chart showing the waveform of the gate signal #GLn supplied to the gate bus line GLn. As shown in FIG. 11B, the description will be made assuming that the waveform of the gate signal #GLn in this operation example is substantially the same as the waveform of the gate signal #GLn shown in FIG.
- FIG. 11C is a timing chart showing the common potential VCOM supplied to the counter electrode wiring COML and the potential VPEn, m applied to the pixel electrode PEn, m.
- FIG. 11 is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn.
- the storage capacitor signal #CSLn in this operation example has the potential VCS11 ′′, the potential VCS12 ′′, the potential VCS13 ′ with two consecutive vertical scanning periods Tv ′′ as one cycle. 'And a signal that takes the potential VCS14' '. More specifically, as shown in FIG. 11 (d), the storage capacitor signal #CSLn takes the potential VCS12 ′ in the period T11 ′′ in one vertical scanning period Tv ′′ and the time t13 in the period T12 ′′.
- the potential VCS13 ′′ is taken from ′′ to time t14 ′′, and the potential VCS12 ′′ is taken from time t14 ′′ to time t15 ′′ in the period T12 ′′.
- the auxiliary capacitance signal #CSLn takes the potential VCS11 ′′ in the subsequent period T13 ′′ in the vertical scanning period Tv ′′ and the potential VCS14 ′′ from the time t16 ′′ to the time t17 ′′ in the period T14 ′′.
- the potential VCS11 ′′ is taken from the time t17 ′′ to the time t18 ′′ in the period T14 ′′. As shown in FIG.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a certain period.
- the transistor Mn, m becomes conductive.
- the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the potential VPEn, m applied to the pixel electrode PEn, m during the period from time t11 ′′ to time t12 ′′ is from the potential V11 ′′ to the potential V12 ′′ ( V12 '' will stand up to positive).
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 ′′ to the potential VCS12 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V12 ′′ to the potential V13 ′′.
- the auxiliary capacitance signal #CSLn falls from the potential VCS12 ′′ to the potential VCS13 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V13 ′′ to the potential V14 ′′.
- the potential difference between the potential V13 ′′ and the common potential VCOM is larger than the potential difference between the potential V14 ′′ and the common potential VCOM. That is, the transmittance of the liquid crystal LC during the period from the time t12 ′′ to the time t13 ′′ is larger than the transmittance of the liquid crystal LC during the period from the time t13 ′′ to the time t14 ′′. That is, the luminance of the pixel region Pn, m in the period from the time t12 ′′ to the time t13 ′′ is larger than the luminance of the pixel region Pn, m in the period from the time t13 ′′ to the time t14 ′′.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a certain period.
- the transistor Mn, m is in a conductive state, and the source signal #SLm is supplied to the pixel electrode PEn, m and the first auxiliary capacitance electrode CE1n, m.
- the auxiliary capacitance signal #CSLn rises from the potential VCS13 ′′ to the potential VCS12 ′′.
- the potential VPEn, m applied to the pixel electrode PEn, m during the period from the time t14 ′′ to the time t15 ′′ is from the potential V14 ′′ to the potential V15 ′′ ( V15 '' will fall to negative).
- the auxiliary capacitance signal #CSLn falls from the potential VCS12 ′′ to the potential VCS11 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V15 ′′ to the potential V16 ′′.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 ′′ to the potential VCS14 ′′. Accordingly, the potential VPEn, m of the pixel electrode PEn, m changes from the potential V16 ′′ to the potential V17 ′′.
- the potential difference between the potential V16 "and the common potential VCOM is larger than the potential difference between the potential V17" and the common potential VCOM. That is, the transmittance of the liquid crystal LC during the period from the time t15 ′′ to the time t16 ′′ is larger than the transmittance of the liquid crystal LC during the period from the time t16 ′′ to the time t17 ′′. That is, the luminance of the pixel region Pn, m in the period from time t15 ′′ to time t16 ′′ is larger than the luminance of the pixel region Pn, m in the period from time t16 ′′ to time t17 ′′.
- the gate signal #GLn rises from the low level to the high level, and falls to the low level after a certain period. Also, the auxiliary capacitance signal #CSLn falls from the potential VCS14 ′′ to the potential VCS11 ′′.
- the operation after time t17 '' is the same as the operation after time t11 '' described above.
- the auxiliary capacitance signal #CSLn rises from the potential VCS11 ′′ to the potential VCS12 ′′ at time t12 ′′, and from the potential VCS12 ′′ to the potential VCS11 ′′ at time t15 ′′.
- the auxiliary capacitance signal #CSLn has the potential VCS11 ′′ from the time t12 ′′ until several horizontal periods (multiple times of the horizontal period Th) elapse.
- the potential VCS12 ′′ to the potential VCS11 ′′ from the time t15 ′′ until several horizontal periods (multiple times the horizontal period Th) elapse.
- auxiliary capacitance signal #CSLn rises from the potential VCS13 ′′ to the potential VCS12 ′′ at the time t14 ′′ has been described, but more generally, the auxiliary capacitance signal #CSLn. rises from the potential VCS13 ′′ to the potential VCS12 ′′ from time t13 ′′ to time t15 ′′.
- the luminance of the pixel region Pn, m in the second half of one vertical scanning period is smaller than the luminance of the pixel region Pn, m in the first half of the one vertical scanning period.
- the phenomenon of the moving image blur can be suppressed.
- the auxiliary capacitance signal #CSLn takes a quaternary voltage level. Therefore, as compared with the operation example 4 and the operation example 5, display with higher luminance can be performed, and the phenomenon of the moving image blur can be more effectively suppressed.
- the gate signal #GLn supplied to the nth gate bus line GLn and the auxiliary capacitance signal #CSLn supplied to the nth auxiliary capacitance bus line CSLn will be described as examples.
- auxiliary capacitor driver 14 in the display panel 1 supplies the auxiliary capacitor signal #CSLn to the auxiliary capacitor bus line CSLn in synchronization with the gate signal #GLn.
- the auxiliary capacitance driver 14 supplies the auxiliary capacitance signal # CSLn + 1 with the polarity inverted from that of the auxiliary capacitance signal #CSLn.
- FIG. 12A is a timing chart showing an example of waveforms of gate signals #GLn to # GLn + 3 supplied to the gate bus lines GLn to GLn + 3, respectively
- FIG. 12 is a timing chart showing an example of waveforms of auxiliary capacitance signals #CSLn to # CSLn + 3 supplied to the auxiliary capacitance bus lines CSLn to CSLn + 3 in the operation example 1 described above
- c) is a timing chart showing an example of waveforms of #CSLn to # CSLn + 3 supplied to each of the auxiliary capacity bus lines CSLn to CSLn + 3 in the operation example 2 described above.
- the auxiliary capacitance driver 14 In the case of driving, as shown in FIGS. 12B to 12C, the auxiliary capacitance driver 14 inverts the polarity of the auxiliary capacitance signal # CSLn + 1 with respect to the polarity of the auxiliary capacitance signal #CSLn. Supply.
- the auxiliary capacitor driver 14 supplies the auxiliary capacitance signals #CSLn to # CSLn + 3 to the auxiliary capacitance bus line CSLn, and the gate signals #GLn to Supply in synchronization with # GLn + 3.
- the auxiliary capacitance driver 14 It is preferable that an auxiliary capacity signal with the polarity reversed is supplied for each of the plurality of auxiliary capacity bus lines.
- the seventh example of the operation of the display panel 1 according to the present embodiment will be described with reference to FIGS.
- the potential level of the auxiliary capacitance signal in the selection period is switched between the maximum potential level of the plurality of potential levels and the minimum potential level every two horizontal line periods. I will explain to you.
- FIG. 13A is a timing chart showing an example of waveforms of gate signals #GLn to # GLn + 3 supplied to the gate bus lines GLn to GLn + 3, respectively
- FIG. 10 is a timing chart showing an example of waveforms of auxiliary capacitance signals #CSLn to # CSLn + 3 supplied to the auxiliary capacitance bus lines CSLn to CSLn + 3 in this operation example.
- the auxiliary capacitor driver 14 has an auxiliary capacitor signal #CSLn and an auxiliary capacitor signal that are in phase with each other with respect to the auxiliary capacitor bus line CSLn and the auxiliary capacitor bus line CSLn + 1.
- # CSLn + 1 is supplied.
- the auxiliary capacitance driver 14 makes a pair of two adjacent auxiliary capacitance bus lines and supplies a common auxiliary capacitance signal to the pair of auxiliary capacitance bus lines.
- the auxiliary capacitor driver 14 is connected to the nth gate bus line GLn of the plurality of gate bus lines GL1 to GLN via the transistor Mn, m and the capacitor Cn, m.
- the connected auxiliary capacitance bus line CSLn and the n + 1th gate bus line GLn + 1 among the plurality of gate bus lines GL1 to GLN are connected to the transistor Mn + 1, m and the capacitor Cn + 1, m.
- the rectangular voltage signals (auxiliary capacitance signal #CSLn and auxiliary capacitance signal # CSLn + 1) are synchronously supplied to the connected auxiliary capacitance bus line CSLn + 1.
- the auxiliary capacitance signal #CSLn and the auxiliary capacitance signal # CSLn + 1 are the same in the auxiliary capacitance driver 14. What is necessary is just to produce
- the moving image blur phenomenon can be suppressed by the auxiliary capacitor driver 14 having a simpler configuration.
- the auxiliary capacitance driver 14 is connected to the nth gate bus line GLn of the plurality of gate bus lines GL1 to GLN via the transistor Mn, m and the capacitor Cn, m.
- the rectangular voltage signals (auxiliary capacitance signal #CSLn and auxiliary capacitance signal # CSLn + 2) may be supplied to the auxiliary capacitance bus line CSLn + 2 connected in synchronization. .
- the auxiliary capacitor driver 14 having a simpler configuration can further suppress the phenomenon of moving image blur while suppressing the generation of streaks according to flicker and polarity inversion. Play.
- auxiliary capacity driver 14 may be configured such that three or more adjacent auxiliary capacity bus lines are set as one set and a common auxiliary capacity signal is supplied to the one set of auxiliary capacity bus lines.
- the display panel 1 has a rectangular auxiliary capacitor composed of a plurality of voltage levels in one vertical scanning period with respect to the auxiliary capacitor bus lines CSL1 to CSLN.
- the luminance of the pixel region Pn, m is relatively high (hereinafter referred to as “bright period”) and the luminance of the pixel region Pn, m Can generate a relatively low period (hereinafter referred to as “dark period”).
- the length of the light period and the length of the dark period in one vertical scanning period can be adjusted by changing the duty ratio of the auxiliary capacitance signal #CSLn supplied by the auxiliary capacitance driver 14.
- the duty ratio of the auxiliary capacitance signal #CSLn is This is a ratio of a period in which the voltage level of the auxiliary capacitance signal #CSLn in the one vertical scanning period takes the maximum voltage level among a plurality of voltage levels, and the potential level of the auxiliary capacitance signal #CSLn in the selection period is a plurality of voltage levels.
- the duty ratio of the auxiliary capacitance signal #CSLn is the voltage level of the auxiliary capacitance signal #CSLn in the one vertical scanning period. This is the ratio of the period during which the minimum voltage level is taken.
- FIG. 14C shows the waveform of the auxiliary capacitance signal #CSLn shown in FIG. 5D, which is set so that the duty ratio is about 90%. Yes.
- the period TD in which the voltage level of the auxiliary capacitance signal #CSLn is relatively low is about 10% of one vertical scanning period Tv ′
- the auxiliary capacitance signal #CSLn A period TB in which the voltage level is relatively high is about 90 percent of one vertical scanning period Tv ′.
- one vertical scanning period Tv ′ shown in FIG. 14C is a vertical scanning period immediately after a positive potential is applied to the pixel electrode PEn, m. Therefore, the duty ratio of the auxiliary capacitance signal #CSLn is about 90%.
- the potential difference between the potential VPEn, m of the pixel electrode PEn, m and the supply potential VCOM in the period TD is equal to the potential VPEn, m of the pixel electrode PEn, m and the supply potential VCOM in the period TB. Therefore, the period TD corresponds to the dark period, and the period TB corresponds to the bright period. In other words, by supplying the auxiliary capacitance signal #CSLn set so that the duty ratio is about 90%, about 90% of one vertical scanning period becomes a light period, and the remaining about 10% period Is the dark period.
- FIG. 15C shows the waveform of the auxiliary capacitance signal #CSLn shown in FIG. 5D, which is set so that the duty ratio is about 10%. Yes.
- the period TD in which the voltage level of the auxiliary capacitance signal #CSLn is relatively low is about 90% of one vertical scanning period Tv ′
- the auxiliary capacitance signal #CSLn A period TB in which the voltage level is relatively high is about 10 percent of one vertical scanning period Tv ′.
- one vertical scanning period Tv ′ shown in FIG. 15C is a vertical scanning period immediately after a positive potential is applied to the pixel electrode PEn, m. Therefore, the duty ratio of the auxiliary capacitance signal #CSLn is about 10%.
- the potential difference between the potential VPEn, m of the pixel electrode PEn, m and the supply potential VCOM in the period TD is equal to the potential VPEn, m of the pixel electrode PEn, m and the supply potential VCOM in the period TB. Therefore, the period TD corresponds to the dark period, and the period TB corresponds to the bright period. In other words, by supplying the auxiliary capacitance signal #CSLn set so that the duty ratio is about 10%, a period of about 10% of one vertical scanning period becomes a light period, and the remaining period of about 90% Is the dark period.
- FIG. 16 is a graph showing the relationship between the duty ratio and the luminance.
- the vertical axis in FIG. 16 represents relative luminance with the minimum luminance being 0.0 and the maximum luminance being 1.0, and the horizontal axis in FIG. 16 represents the duty ratio.
- the relative luminance increases as the duty ratio increases.
- FIG. 17 is a graph of experimental data showing the relationship between the duty ratio and the visibility of the moving image displayed on the display panel 1.
- the vertical axis in FIG. 17 represents the visibility perceived by the observer observing the moving image displayed on the display panel 1 in a five-step evaluation. The higher the visibility, the clearer the moving image is by the observer. That is, it shows that the image is less blurred.
- the horizontal axis in FIG. 17 represents the duty ratio described above.
- the dotted line in FIG. 17 is a graph showing the lowest evaluation among the visibility evaluations made by each of the plurality of observers, and the broken line in FIG. 17 is the visibility evaluation made by each of the plurality of observers. Among them, the graph shows the highest evaluation, and the solid line in FIG. 17 is a graph showing the average value of the visibility evaluation made by each of a plurality of observers.
- the above-described duty ratio is preferably set within a range of about 10 percent to about 90 percent.
- the source driver 12 receives the source signals # SL1 to #SLM in accordance with the amplitudes of the auxiliary capacitance signals # CSL1 to #CSLN supplied by the auxiliary capacitance driver 14. It is preferable to set the magnitude of the amplitude.
- FIG. 18A is a timing chart showing the waveform of the gate signal #GLn.
- FIG. 18B shows the pixel electrode PEn, m when the common potential VCOM and the amplitude of the source signal #SLm are larger.
- FIG. 18C is a timing chart showing the waveform of the potential VPEn, m applied to the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn when the amplitude of the source signal #SLm is larger. It is a timing chart which shows the waveform.
- FIG. 18D is a timing chart showing waveforms of the potential VPEn, m applied to the pixel electrode PEn, m when the amplitude of the common potential VCOM and the source signal #SLm is smaller.
- E is a timing chart showing the waveform of the auxiliary capacitance signal #CSLn supplied to the auxiliary capacitance bus line CSLn when the amplitude of the source signal #SLm is smaller.
- the amplitude A1 shown in (b) of FIG. 18 and the amplitude A2 shown in (d) of FIG. 18 represent the amplitude of the source signal #SLm.
- the auxiliary capacitance driver 14 supplies the auxiliary capacitance signal #CSLn having a smaller amplitude, and the source signal #SL
- the auxiliary capacitance signal #CSLn having a larger amplitude is supplied.
- the source driver 12 supplies the source signal #SLm having a larger amplitude, and the auxiliary capacitor driver 14 has the higher amplitude.
- the source driver 12 supplies the source signal #SLm having a smaller amplitude so that the amplitude of the auxiliary capacitance signal #CSLn is smaller. Even in this case, the average value of the luminance of the pixel region Pn, m in one vertical scanning period Tv can be kept substantially constant.
- a specific configuration for supplying rectangular auxiliary capacitance signals # CSL1 to #CSLN having a plurality of voltage levels to the auxiliary capacitance bus lines CSL1 to CSLN as described above is, for example, the auxiliary capacitance driver 14
- this can be realized by including a plurality of power supplies that supply the plurality of voltage levels and a selector that selects one of the voltage levels supplied from the plurality of power supplies.
- FIG. 19 is a block diagram showing the configuration of the auxiliary capacitor driver 14 for supplying auxiliary capacitor signals # CSL1 to #CSLN having four voltage levels.
- the auxiliary capacitor driver 14 includes a first power supply B1, a second power supply B2, a third power supply B3, and a fourth power supply B4. As shown in FIG. 19, the auxiliary capacitor driver 14 includes an nth selector SELn (1 ⁇ n ⁇ N) connected to the auxiliary capacitor bus line CSLn (1 ⁇ n ⁇ N).
- a control signal # 11c output from the control unit 11 is supplied to the nth selector SELn.
- the fourth potential output from the power source 4 is supplied to the nth selector SELn (1 ⁇ n ⁇ N).
- the n-th selector SELn selects any one of the first potential, the second potential, the third potential, and the fourth potential in accordance with the control signal # 11c, and supports it. Supply to the capacity bus line CSLn.
- each of the DACs to which digital values corresponding to the first to fourth potentials are input may be used, or another configuration may be used.
- the auxiliary capacitance driver 14 in the display panel 1 includes amplitude changing means for changing the amplitude of the rectangular voltage signal (auxiliary capacitance signal #CSLn). preferable.
- the auxiliary capacitor driver 14 includes the amplitude changing unit that changes the amplitude of the rectangular voltage signal, the phenomenon of moving image blur can be more effectively suppressed.
- the source driver 12 supplies the source signal #SLm having a larger amplitude when the amplitude of the rectangular voltage signal (auxiliary capacitance signal #CSLn) is smaller. Then, when the amplitude of the rectangular voltage signal (auxiliary capacitance signal #CSLn) is larger, the source signal #SLm having a smaller amplitude is supplied.
- the source driver supplies the source signal having a larger amplitude, and when the amplitude of the rectangular voltage signal is larger. Since the source signal having a smaller amplitude can be supplied, even if the amplitude of the rectangular voltage signal is larger or the amplitude of the rectangular voltage signal is smaller, There is a further effect that the motion blur phenomenon can be effectively suppressed.
- the amplitude of the source signal is defined as a value obtained by subtracting the potential of the source signal at the time of negative polarity writing from the potential of the source signal at the time of positive polarity writing (the same applies hereinafter).
- the positive polarity writing refers to the case where the conduction signal is supplied and the rectangular voltage signal is at the lowest voltage level, and the negative polarity writing is the time when the conduction signal is supplied. This refers to the case where the rectangular voltage signal has the highest voltage level (the same applies hereinafter).
- FIG. 20 is a block diagram showing a configuration of the display panel 2 according to the present embodiment.
- the display panel 2 includes an auxiliary capacitor driver 24 instead of the auxiliary capacitor driver 14 in the display panel 1, and includes a display unit 26 instead of the display unit 16 in the display panel 1. Yes.
- the display unit 26 includes N gate bus lines GL1 to GLN (in the present embodiment, it is assumed that N is an even number), and M source bus lines SL1 to SLM.
- N / 2 auxiliary capacity bus lines CSL1 to CSLN / 2 are provided.
- the auxiliary capacity driver 24 supplies auxiliary capacity signals # CSL1 to # CSLN / 2 to each of the N / 2 auxiliary capacity bus lines CSL1 to CSLN / 2.
- the source driver 12 in this embodiment supplies a source signal whose polarity is inverted every two consecutive horizontal scanning periods to the source bus line SLm.
- FIG. 21A is a timing chart showing an example of waveforms of gate signals #GLn to # GLn + 3 supplied to the gate bus lines GLn to GLn + 3 by the gate driver 13 in the display panel 2, respectively.
- the number of the plurality of gate bus lines GL1 to GLN is an even number
- the number of the plurality of auxiliary capacitance bus lines is half the number of the gate bus lines. (That is, N / 2)
- the transistor M2k, m is connected to the other end of C2k-1, m (second auxiliary capacitance electrode CE2 2k-1, m) and the 2kth gate bus line GL2k, m of the plurality of gate bus lines.
- the other end of the capacitor C2k, m connected via the second auxiliary capacitance electrode CE2,2k is connected to the kth auxiliary capacitance bus line CSLk among the plurality of auxiliary capacitance bus lines. .
- the display panel 2 according to the present embodiment can halve the number of storage capacitor bus lines compared to the display panel 1 according to the first embodiment. Therefore, the configuration of the display unit 26 in the display panel 2 can be simplified as compared with the configuration of the display unit 16 in the display panel 1. Further, the auxiliary capacitor driver 24 in the display panel 2 only has to supply auxiliary capacitor signals # CSL1 to # CSLN / 2 to each of N / 2 auxiliary capacitor bus lines CSL1 to CSLN / 2. The configuration can be simplified compared to the auxiliary capacitor driver 14 in the display panel 1 that supplies the auxiliary capacitance signals # CSL1 to #CSLN to the auxiliary capacitance bus lines CSL1 to CSLN. That is, according to the display panel 2 according to the present embodiment, the moving image blurring phenomenon can be suppressed with a simpler configuration than the display panel 1 in the first embodiment.
- FIG. 22 is a block diagram showing a configuration of the display panel 3 according to the present embodiment.
- the display panel 3 includes a control unit 31, a source driver 12, an auxiliary capacitance driver 141, an auxiliary capacitance driver 142, and a display unit 36.
- the display panel 3 includes a gate driver (not shown) and a counter electrode driver (not shown).
- the gate driver (not shown) and the counter electrode driver (not shown) have the same configurations as the gate driver 13 and the counter electrode driver 15 in the display panel 1, respectively.
- the auxiliary capacity driver 141 and the auxiliary capacity driver 142 are arranged on both sides of the display unit 36, respectively.
- the auxiliary capacity driver 141 is supplied with a control signal # 11c2 from the controller 31, and the auxiliary capacity driver 142 is supplied with a control signal # 11c1 from the controller 31.
- M source bus lines SL1 to SLM and N gate bus lines (not shown) are formed.
- the N gate bus lines (not shown) have the same configuration as the N gate bus lines GL1 to GLN in the display panel 1.
- the display unit 36 is provided with a counter electrode wiring (not shown) similar to the counter electrode wiring COML in the display panel 1.
- N auxiliary capacity bus lines CSLL 1 to CSLN are formed on the left half surface of the display unit 36 substantially perpendicularly to the source bus lines SL 1 to SLM.
- N auxiliary capacitor bus lines CSLR1 to CSLRN are formed substantially perpendicular to the source bus lines SL1 to SLM.
- the N auxiliary capacity bus lines CSLL1 to CSLNL and the N auxiliary capacity bus lines CSLR1 to CSLRN are insulated from each other.
- the auxiliary capacity bus line CSLLn and the auxiliary capacity bus line CSLRn are arranged on the same straight line.
- the auxiliary capacitance bus line CSLn in the display panel 1 includes two auxiliary capacitance bus lines CSLLn formed on the same straight line via the insulating portion, and the auxiliary capacitance bus line. It consists of CSLRn.
- auxiliary capacity bus lines CSLL1 to CSLNL One end of each of the N auxiliary capacity bus lines CSLL1 to CSLNL is connected to the auxiliary capacity driver 141, and one end of each of the N auxiliary capacity bus lines CSLR1 to CSLRN is The auxiliary capacity driver 142 is connected.
- auxiliary capacity bus lines CSLL1 to CSLRN are insulated from the auxiliary capacity bus lines CSLR1 to CSLRN.
- the auxiliary capacity driver 141 supplies auxiliary capacity signals # CSLL1 to #CSLRN to the auxiliary capacity bus lines CSLL1 to CSLNL, respectively, and the auxiliary capacity driver 142 corresponds to the auxiliary capacity bus lines CSLR1 to CSLRN, respectively. Signals # CSLR1 to #CSLRN are supplied.
- FIG. 23 is a circuit diagram showing a configuration of the display unit 36 in the region R shown in FIG.
- the second auxiliary capacitance electrodes CE2n, 1 to CE2n, k formed in the pixel regions Pn, 1 to Pn, k defined by the source bus lines SL1 to SLk are the auxiliary capacitance bus lines.
- Second auxiliary capacitance electrodes CE2n, k + 1 to CE2n, M connected to CSLLn and formed in pixel regions Pn, k + 1 to Pn, M defined by source bus lines SLk + 1 to SLM Are connected to the auxiliary capacity bus line CSLRn.
- the value of k is preferably about M / 2.
- M is the number of source bus lines.
- the value of k is preferably in the range of approximately 0.45 ⁇ M to 0.55 ⁇ M.
- the auxiliary capacity driver 141 and the auxiliary capacity driver 142 may be configured to perform the same operation as the auxiliary capacity driver 14 described in the first embodiment, or may be configured to supply different auxiliary capacity signals.
- the auxiliary capacitance driver 141 supplies auxiliary capacitance signals #CSLL 1 to #CSLN as in the operation example 2 of the first embodiment
- the auxiliary capacitance driver 142 supplies the auxiliary capacitance signals CSLR 1 to #CLR as in the operation example 5 of the first embodiment.
- CSLRN may be supplied.
- the configuration may be such that the duty ratios of the auxiliary capacity signals # CSLL1 to #CSLLN output from the auxiliary capacity driver 141 are different from the duty ratios of the auxiliary capacity signals # CSLR1 to #CSLRN output from the auxiliary capacity driver 142.
- the source driver 12 supplies source signals # SL1 to #SLk having a larger amplitude as shown in FIG. 18B to the source bus lines SL1 to SLk, and supplies the source bus lines SLk + 1 to SLM.
- the auxiliary capacitance driver 141 applies the auxiliary capacitance bus lines CSLL1 to CSLLN to FIG.
- auxiliary capacitance driver 142 supplies the auxiliary capacitance bus lines CSLR1 to CSLRN as shown in FIG. It is preferable to supply auxiliary capacitance signals # CSLR1 to #CSLRN having a larger amplitude.
- the display panel 3 includes two auxiliary capacitor drivers (auxiliary capacitor driver 141 and auxiliary capacitor driver 142), and the arbitrary auxiliary capacitor bus line (auxiliary capacitor bus line CSLn) It is composed of two auxiliary capacity bus lines (auxiliary capacity bus line CSLLn and auxiliary capacity bus line CSLRn) formed on the same straight line through an insulating portion, and the auxiliary capacity of one of the two auxiliary capacity drivers
- the capacity driver (auxiliary capacity driver 141) is connected to one of the two auxiliary capacity bus lines (auxiliary capacity bus line CSLLn) in the one scanning period (one vertical scanning period). In synchronization with the signal (high level section of the gate signal GLn), the first voltage level and the first voltage level are different from each other.
- a rectangular voltage signal (auxiliary capacitance signal #CSLLn) having a second voltage level is supplied, and the other auxiliary capacitance driver (auxiliary capacitance driver 142) of the two auxiliary capacitance drivers is In the scanning period, the other one of the two auxiliary capacitance bus lines (auxiliary capacitance bus line CSLRn) is synchronized with the conduction signal and has the first voltage level and the first auxiliary capacitance bus line CSLRn.
- a rectangular voltage signal (auxiliary capacitance signal #CSLRn) having a second voltage level different from the voltage level is supplied.
- the pixel electrode connected to the one auxiliary capacitance bus line (auxiliary capacitance bus line CSLLn) and the other auxiliary capacitance bus line (auxiliary capacitance bus line CSLRn) are connected.
- the rectangular voltage signals (auxiliary capacitance signal #CSLLn and auxiliary capacitance signal #CSLRn) can be supplied to the pixel electrodes thus formed independently of each other.
- a pixel region including a pixel electrode connected to the one auxiliary capacitance bus line and a pixel region including a pixel electrode connected to the other one auxiliary capacitance bus line include: Since it is possible to display images with different effects of improving the motion blur phenomenon, it is possible to appeal the motion blur improvement effect of the present invention to the user. That is, the effect of improving the moving image blur according to the present invention can be effectively appealed to the user.
- the source driver 12 is connected to the one auxiliary capacitor bus line (auxiliary capacitor bus line CSLLn) via the capacitor Cn, m (m ⁇ k) and the transistor Mn, m.
- the source bus line SLm and the source bus line SLr connected to the other auxiliary capacitance bus line (auxiliary capacitance bus line CSLRn) via the capacitor Cn, r (r ⁇ k + 1) and the transistor Mn, r;
- source signals having different amplitudes may be supplied.
- the rectangular voltage signals (auxiliary capacitance signal #CSLLn and auxiliary capacitance signal #CSLRn) are supplied to the pixel electrodes PEn, m (m ⁇ k + 1) connected to the bus line CSLRn) independently of each other.
- the pixel region including the pixel electrode connected to the one auxiliary capacitance bus line and the other one auxiliary capacitance bus line are connected.
- the moving image according to the present invention is displayed to the user.
- the effect of improving blur can be promoted more effectively. That is, the effect of improving the moving image blur according to the present invention can be more effectively appealed to the user.
- the length of the one auxiliary capacitor bus line (auxiliary capacitor bus line CSLLn) is approximately 45% to approximately 55% of the length of the arbitrary auxiliary capacitor bus line (auxiliary capacitor bus line CSLn in the display panel 1).
- the length of the other auxiliary capacity bus line (auxiliary capacity bus line CSLRn) is determined from the length of the arbitrary auxiliary capacity bus line (auxiliary capacity bus line CSLn in the display panel 1). It is substantially equal to the length obtained by subtracting the length of the auxiliary capacity bus line (auxiliary capacity bus line CSLLn).
- the luminance of the pixel region including the pixel electrodes PEn, m (n ⁇ k) disposed on one half surface of the display unit 36, and The luminance of the pixel area including the pixel electrodes PEn, m (n ⁇ k + 1) arranged on one half surface can be controlled independently in the one scanning period. Therefore, according to the above configuration, the moving image blur phenomenon can be more effectively suppressed.
- the load characteristic of the one auxiliary capacity bus line and the load characteristic of the other one auxiliary capacity bus line can be made substantially the same, the auxiliary capacity connected to the one auxiliary capacity bus line
- the configuration of the driver and the configuration of the auxiliary capacitance driver connected to the other auxiliary capacitance bus line can be made substantially the same.
- the one auxiliary capacitor driver (auxiliary capacitor driver 141) is a first amplitude changing unit (FIG. 19) that changes the amplitude of the rectangular voltage signal.
- the other one of the auxiliary capacitor drivers (auxiliary capacitor driver 142) has a second amplitude changing means (which changes the amplitude of the rectangular voltage signal).
- FIG. 19 A configuration similar to the configuration shown in FIG. 19 is provided.
- the one auxiliary capacitance driver and the other one auxiliary capacitance driver supply the rectangular voltage signals having different amplitudes, respectively.
- a pixel region having a pixel electrode connected to a bus line and a pixel region having a pixel electrode connected to the other auxiliary capacitor bus line display images having different effects of improving the moving image blur phenomenon. Therefore, the effect of improving the moving image blur according to the present invention can be appealed to the user. That is, the effect of improving the moving image blur according to the present invention can be more effectively appealed to the user.
- the source driver 12 supplies the rectangular voltage signal (auxiliary capacitance signal #CSLLn) having a smaller amplitude to the one auxiliary capacitance bus line CSLLn from the one auxiliary capacitance driver (auxiliary capacitance driver 141).
- the source signal having a larger amplitude than the source bus line SLm connected to the one auxiliary capacitance bus line CSLLn via the capacitor Cn, m (m ⁇ k) and the transistor Mn, m.
- #SLm is supplied and the one auxiliary capacitor driver (auxiliary capacitor driver 141) supplies the rectangular voltage signal (auxiliary capacitor signal #CSLLn) having a larger amplitude to the one auxiliary capacitor bus line CSLLn.
- auxiliary capacitance bus line CSLLn Is connected to the one auxiliary capacitance bus line CSLLn via the capacitor Cn, m and the transistor Mn, m.
- the source signal #SLm having a smaller amplitude is supplied to the connected source bus line SLm, and the other auxiliary capacitor driver (auxiliary capacitor driver 142) is supplied to the other auxiliary capacitor bus line CSLRn.
- auxiliary capacitance signal #CSLRn auxiliary capacitance signal having a smaller amplitude
- the source signal #SLm having a larger amplitude is supplied to the source bus line SLm, and the other auxiliary capacitor driver (auxiliary capacitor driver 142) supplies an amplitude to the other auxiliary capacitor bus line CSLRn.
- the larger rectangular voltage signal (auxiliary capacitance signal #CSLRn) is supplied, the other auxiliary capacitance bus line CS is supplied.
- the Rn capacitor Cn, m and the transistors Mn it is preferable to supply the smaller the source signal #SLm amplitude relative to the source bus line SLm connected via the m.
- the capacitor and the transistor are connected to the one auxiliary capacitor bus line in accordance with the amplitude of the rectangular voltage signal supplied to the one auxiliary capacitor bus line by the one auxiliary capacitor driver.
- the rectangular shape which controls the amplitude of the source signal supplied from the source driver to the source bus line connected via the other bus, and the other one auxiliary capacitor driver supplies to the other auxiliary capacitor bus line.
- the amplitude of the source signal supplied by the source driver to the source bus line connected to the other auxiliary capacitor bus line via the capacitor and the transistor is controlled in accordance with the amplitude of the voltage signal of
- the one auxiliary capacity bus line can be provided with the same visibility of the image other than the motion blur phenomenon.
- the pixel region including the connected pixel electrode and the pixel region including the pixel electrode connected to the other one auxiliary capacitor bus line may display images having different effects of improving the motion blur phenomenon. it can. Therefore, the effect of improving the moving image blur according to the present invention can be more effectively appealed to the user.
- FIG. 24 is a circuit diagram showing a configuration of the display unit 46 in the display panel according to the present embodiment.
- Other configurations of the display panel according to the present embodiment are the same as the configuration of the display panel 1 according to the first embodiment.
- FIG. 25 is a diagram showing the polarity of the potential applied to each pixel electrode of the display unit 46.
- potentials having opposite polarities are applied to adjacent pixels.
- the source driver in the present embodiment seems to have the polarity of the source signal #SLm and the polarity of the source signal # SLm + 1 opposite to each other at an arbitrary timing.
- the source signal # SL1 to #SLM may be supplied.
- the second auxiliary capacitance electrode CE2n, m formed in the pixel region Pn, m in the display unit 46 is connected to the auxiliary capacitance bus line CSLn and formed in the pixel region Pn, m + 1.
- the second auxiliary capacitance electrode CE2n, m + 1 is connected to the auxiliary capacitance bus line CSLn-1.
- the second storage capacitor electrode CE2n + 1, m formed in the pixel region Pn + 1, m is connected to the storage capacitor bus line CSLn + 1 and formed in the pixel region Pn + 1, m + 1.
- the second auxiliary capacitance electrode CE2n + 1, m + 1 is connected to the auxiliary capacitance bus line CSLn.
- the auxiliary capacitor driver in this embodiment supplies auxiliary capacitor signals # CSL1 to #CSLN in which the polarity of the auxiliary capacitor signal #CSLn and the polarity of the auxiliary capacitor signal # CSLn + 1 are opposite to each other.
- This can be realized, for example, by making the auxiliary capacitance driver in the present embodiment the same configuration as the auxiliary capacitance driver 14 in the first embodiment.
- the one end (first auxiliary capacitance electrode CE1n, m) of the capacitor Cn, m is the nth gate bus line GLn among the plurality of gate bus lines.
- the capacitance electrode CE2n, m) is connected to the nth auxiliary capacitance bus line CSLn among the plurality of auxiliary capacitance bus lines, and the one end (first auxiliary capacitance electrode CE1n, m +) of the capacitor Cn, m + 1.
- the display panel configured as described above, by performing dot inversion driving in which the potentials applied to the pixel electrodes adjacent to each other have opposite polarities, the above moving image is suppressed while suppressing flicker and crosstalk.
- the blur phenomenon can be suppressed.
- the display panel according to the present invention is connected to a plurality of gate bus lines, a plurality of source bus lines, a plurality of auxiliary capacitance bus lines, and an arbitrary gate bus line among the plurality of gate bus lines. And a pixel electrode connected to a drain of the transistor, one end of which is in parallel with the pixel electrode.
- a capacitor connected to the drain of the transistor and having the other end connected to an arbitrary auxiliary capacitance bus line of the plurality of auxiliary capacitance bus lines and one end of each of the plurality of source bus lines;
- a source driver for supplying a source signal to a source bus line of each of the plurality of gate bus lines;
- a gate driver connected to the end and sequentially supplying a conduction signal for conducting the transistor to the arbitrary gate bus line; a counter electrode facing the pixel electrode through a liquid crystal; and a connection to the counter electrode And a counter electrode driver that supplies a common potential to the counter electrode wiring, wherein the gate driver is connected to the arbitrary gate bus line.
- At least the first voltage level and the first voltage are synchronized with the conduction signal for the arbitrary auxiliary capacitance bus line.
- An auxiliary capacitor driver for supplying a rectangular voltage signal having a second voltage level different from the voltage level, and the rectangular driver is provided in the one scanning period.
- Period voltage signal is said first voltage level, and, the second period is a voltage level, respectively, longer than the response time of the liquid crystal is characterized in that.
- a hold-type display device such as a liquid crystal display device
- an object stays at that position until a next frame is displayed after a frame is displayed. Even during a period in which the object is displayed, the moving object moves on the screen to track the object, so that a moving image blur phenomenon occurs in which the outline of the moving object is recognized as blurred.
- the display panel according to the present invention is connected to a plurality of gate bus lines, a plurality of source bus lines, a plurality of auxiliary capacitance bus lines, and an arbitrary gate bus line among the plurality of gate bus lines. And a pixel electrode connected to a drain of the transistor, one end of which is in parallel with the pixel electrode.
- a capacitor connected to the drain of the transistor and having the other end connected to an arbitrary auxiliary capacitance bus line of the plurality of auxiliary capacitance bus lines and one end of each of the plurality of source bus lines;
- a source driver for supplying a source signal to a source bus line of each of the plurality of gate bus lines
- a gate driver connected to one end and sequentially supplying a conduction signal for conducting the transistor to the arbitrary gate bus line; a counter electrode facing the pixel electrode through a liquid crystal layer; and a counter electrode
- a display panel comprising: a connected counter electrode wiring; and a counter electrode driver that supplies a common potential to the counter electrode wiring, wherein the gate driver is connected to the arbitrary gate bus line.
- the first voltage level and the first voltage are synchronized with the conduction signal for the arbitrary auxiliary capacitance bus line. Since the storage capacitor driver for supplying a rectangular voltage signal having a second voltage level different from the voltage level is provided, the above-mentioned lead bus is connected to the arbitrary gate bus line. In one scanning period from when a signal is supplied to when the next conduction signal is supplied, the first voltage level and the pixel electrode connected to the arbitrary gate bus line via the transistor are A second voltage level different from the first voltage level can be applied.
- the period in which the rectangular voltage signal is at the first voltage level and the period in which the voltage signal is at the second voltage level are respectively Longer than response time of liquid crystal.
- the response time of the liquid crystal is a time required for the alignment of the liquid crystal to change after an electric field is applied to the liquid crystal, and generally requires 1 ms or more.
- the luminance of the image in the pixel region in which the pixel electrode is formed can be changed to binary in the one scanning period.
- the auxiliary capacitor driver provided in the display panel according to the present invention supplies a rectangular voltage signal composed of the first voltage level and the second voltage level in synchronization with the conduction signal. Can do. Therefore, the voltage level of the rectangular voltage signal changes after a certain time has elapsed since the conduction signal was supplied.
- the light / dark switching is performed after a certain time has elapsed since the video data was updated in each of all the pixel regions on the screen. It can be carried out.
- the moving image blur can be suppressed without using a frame memory for temporarily storing the image signal. Therefore, the manufacturing cost can be reduced as compared with the conventional configuration using the frame memory for temporarily storing the image signal. In addition, there is an effect that power consumption can be reduced as compared with a conventional configuration using a frame memory for temporarily storing image signals.
- the rectangular voltage signal is generated by one of the first voltage level and the second voltage level in a continuous period of at least 10% of the one scanning period. It is preferable to take a voltage level of the value.
- the rectangular voltage signal has a voltage level of one of the first voltage level and the second voltage level in a continuous period of at least 10 percent of the one scanning period. Therefore, there is a further effect that the phenomenon of moving image blur can be effectively suppressed.
- the rectangular voltage signal is the first voltage level during a period from the start of the one scanning period until approximately 10% of the one scanning period elapses.
- one voltage level of the second voltage levels is taken, and the first voltage level or the first voltage level in the period from the lapse of about 90% of the one scanning period to the end of the one scanning period It is preferable to take the other one of the second voltage levels.
- the display panel according to the present invention in the one scanning period, it is represented by a difference between the potential of the pixel electrode and the potential of the counter electrode when the rectangular voltage signal is at the first voltage level.
- To the liquid crystal expressed by the difference between the polarity of the applied voltage to the liquid crystal and the potential of the pixel electrode and the potential of the counter electrode when the rectangular voltage signal is at the second voltage level.
- the polarity of the applied voltage is preferably different from each other.
- an absolute value of a potential difference between the first voltage level and the second voltage level is not more than twice a threshold voltage of the liquid crystal.
- the orientation of the liquid crystal is not affected even when a voltage lower than the threshold voltage is applied to the liquid crystal.
- the threshold voltage is a voltage at which the alignment of the liquid crystal starts to be affected (the same applies hereinafter).
- the absolute value of the potential difference between the first voltage level and the second voltage level is not more than twice the threshold voltage of the liquid crystal, the voltage level of the rectangular voltage signal Even when the voltage level is the first voltage level or the second voltage level, the alignment of the liquid crystal can be prevented from being affected.
- the voltage level of the rectangular voltage signal is the first voltage level. Even if it is, even if it is the said 2nd voltage level, there exists the further effect that a black display can be performed.
- the auxiliary capacitance driver is configured to output the first voltage level in synchronization with the conduction signal with respect to the arbitrary auxiliary capacitance bus line in the one scanning period. It is preferable to supply a rectangular voltage signal composed of a second voltage level and a third voltage level different from any of the first voltage level and the second voltage level.
- the auxiliary capacitance driver is configured such that the first voltage level and the second voltage are synchronized with the conduction signal with respect to the arbitrary auxiliary capacitance bus line in the one scanning period. Since a rectangular voltage signal having a level and a third voltage level different from any of the first voltage level and the second voltage level can be supplied, the arbitrary voltage can be supplied in the one scanning period.
- the voltage level applied to the auxiliary capacity bus line changes to three values. In other words, the voltage level applied to the storage capacitor bus line transitions twice in the one scanning period.
- the voltage applied to the liquid crystal after the first transition of the voltage level by the first transition of the voltage level in the one scanning period is suitable for display after the first transition of the voltage level. It is possible to switch between high luminance and low luminance by the second transition of the voltage level.
- the rectangular voltage signal may be generated by the first voltage level, the second voltage level, or the third voltage signal in a period of at least 10 percent of the one scanning period. It is preferable to take any one of the voltage levels.
- the rectangular voltage signal has the first voltage level, the second voltage level, or the third voltage level in a period of at least 10 percent of the one scanning period. Among them, since any one of the voltage levels is taken, there is a further effect that the phenomenon of moving image blur can be effectively suppressed.
- the rectangular voltage signal is the first voltage level during a period from the start of the one scanning period until approximately 10% of the one scanning period elapses. Any one of the second voltage level and the third voltage level is taken, and after approximately 90% of the one scanning period has elapsed, the one scanning period ends. In the period, it is preferable to take another voltage level of the first voltage level, the second voltage level, or the third voltage level.
- the applied voltage to the liquid crystal represented by the difference between the potential of the pixel electrode and the potential of the counter electrode after the first transition of the voltage level in the one scanning period.
- the polarity of the voltage applied to the liquid crystal expressed by the difference between the potential of the pixel electrode and the potential of the counter electrode after the next transition of the voltage level is different from each other. Is preferred.
- the absolute value of the voltage applied to the liquid crystal is sufficiently set in the one scanning period even after the first voltage level transition or after the next voltage level transition. Can be made smaller.
- the highest voltage level among the first voltage level, the second voltage level, and the third voltage level, the first voltage level, Of the second voltage level and the third voltage level is preferably not more than twice the threshold voltage of the liquid crystal.
- the highest voltage level among the first voltage level, the second voltage level, and the third voltage level, the first voltage level, and the second voltage level Since the absolute value of the potential difference from the intermediate voltage level among the level and the third voltage level is not more than twice the threshold voltage of the liquid crystal, the voltage level of the rectangular voltage signal is the first voltage level. It is possible to prevent the liquid crystal alignment from being affected at any voltage level of the voltage level, the second voltage level, and the third voltage level.
- the voltage level of the rectangular voltage signal is the first voltage level
- the auxiliary capacitance driver is configured to output the first voltage level in synchronization with the conduction signal with respect to the arbitrary auxiliary capacitance bus line in the one scanning period.
- a rectangular voltage signal comprising a second voltage level and a third voltage level different from any of the first voltage level and the second voltage level is supplied, and the next one scan of the one scan period In the period, any two voltage levels of the first voltage level, the second voltage level, and the third voltage level, the first voltage level, the second voltage level,
- a rectangular voltage signal comprising a fourth voltage level different from any of the third voltage levels is supplied.
- the auxiliary capacitance driver is configured such that the first voltage level and the second voltage are synchronized with the conduction signal with respect to the arbitrary auxiliary capacitance bus line in the one scanning period. Since a rectangular voltage signal having a level and a third voltage level different from any of the first voltage level and the second voltage level can be supplied, the arbitrary voltage can be supplied in the one scanning period.
- the voltage level applied to the auxiliary capacity bus line changes to three values. In other words, the voltage level applied to the storage capacitor bus line transitions twice in the one scanning period.
- the voltage applied to the liquid crystal after the first transition of the voltage level by the first transition of the voltage level in the one scanning period is suitable for display after the first transition of the voltage level. It is possible to switch between high luminance and low luminance by the second transition of the voltage level.
- any one of the first voltage level, the second voltage level, and the third voltage level in one scanning period following the one scanning period is selected. Since a rectangular voltage signal comprising a voltage level and a fourth voltage level different from any of the first voltage level, the second voltage level, and the third voltage level can be supplied. Compared to a case where a rectangular voltage signal composed of the first voltage level, the second voltage level, and the third voltage level is supplied in one scanning period following the one scanning period. In addition, the brightness levels of high brightness and low brightness can be adjusted more flexibly.
- the absolute value of the potential difference of the voltage level before and after the first transition of the voltage level in the one scanning period is the time before and after the transition of the next voltage level in the one scanning period. Is preferably smaller than the absolute value of the potential difference of the voltage level.
- the absolute value of the potential difference of the voltage level before and after the first voltage level transition in the one scanning period is the voltage level before and after the next voltage level transition in the one scanning period. Therefore, the luminance difference before and after the next voltage level transition can be made larger than the luminance difference before and after the first voltage level transition. Therefore, according to said structure, there exists the further effect that the phenomenon of the said moving image blur can be suppressed more effectively.
- the rectangular voltage signal is generated by the first voltage level, the second voltage level, and the third voltage in a period of at least 10 percent of the one scanning period. It is preferable to take any one of the level or the fourth voltage level.
- the rectangular voltage signal is output from the first voltage level, the second voltage level, the third voltage level, or at least 10% of the one scanning period, or Since any one of the fourth voltage levels is taken, the moving image blurring phenomenon can be effectively suppressed.
- the rectangular voltage signal is the first voltage level during a period from the start of the one scanning period until approximately 10% of the one scanning period elapses. Any one of the second voltage level, the third voltage level, and the fourth voltage level is taken, and after a period of approximately 90% of the one scanning period has elapsed, In the period until the end of one scanning period, another voltage level of the first voltage level, the second voltage level, the third voltage level, or the fourth voltage level is taken. Is preferable.
- the applied voltage to the liquid crystal represented by the difference between the potential of the pixel electrode and the potential of the counter electrode after the first transition of the voltage level in the one scanning period.
- the polarity of the voltage applied to the liquid crystal expressed by the difference between the potential of the pixel electrode and the potential of the counter electrode after the next transition of the voltage level is different from each other. Is preferred.
- the absolute value of the voltage applied to the liquid crystal is sufficiently set in the one scanning period even after the first voltage level transition or after the next voltage level transition. Can be made smaller.
- the second lowest voltage level among the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level is The absolute value of the potential difference from the highest voltage level among the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level is the threshold voltage of the liquid crystal. It is preferable that it is 2 times or less.
- the second lowest voltage level among the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level, and the first voltage level The absolute value of the potential difference from the highest voltage level among the second voltage level, the second voltage level, the third voltage level, and the fourth voltage level is not more than twice the threshold voltage of the liquid crystal. Therefore, the voltage level of the rectangular voltage signal is any one of the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level. In addition, the alignment of the liquid crystal can be prevented from being affected.
- the voltage level of the rectangular voltage signal is the first voltage level
- the gate driver when the gate driver supplies the conduction signal to the arbitrary gate bus line, the voltage level of the arbitrary auxiliary capacitance bus line is the highest among the voltage levels.
- the auxiliary capacitance driver supplies the rectangular voltage signal whose voltage level is in ascending order during the one scanning period to the arbitrary auxiliary capacitance bus line. It is preferable to do.
- the rise from low luminance to high luminance is not possible due to the fact that the response of the liquid crystal has a finite time.
- a sufficient phenomenon occurs.
- the time required for the change from low luminance to high luminance is longer than the time required for the change from high luminance to low luminance.
- the above phenomenon can occur at the timing when the potential of the pixel electrode changes to a high voltage when the signal applied to the pixel electrode is positive.
- the gate driver when the gate driver supplies the conduction signal to the arbitrary gate bus line, the lowest voltage level among the voltage levels is set to the arbitrary auxiliary capacitance bus line.
- a voltage signal having a lower voltage level can be supplied to the pixel electrode in the one scanning period, and a voltage signal having a higher voltage level can be subsequently supplied.
- the potential applied to the pixel electrode can be gradually changed to a high voltage. As a result, it is possible to suppress the phenomenon that the rise from the low luminance to the high luminance, which may occur in the normally black method, is insufficient.
- the gate driver when the gate driver supplies the conduction signal to the arbitrary gate bus line, the voltage level of the arbitrary auxiliary capacitance bus line is the highest among the voltage levels.
- the auxiliary capacitor driver supplies the rectangular voltage signal whose voltage level is descending to the arbitrary auxiliary capacitor bus line in the one scanning period. It is preferable to do.
- the rise from low luminance to high luminance is not possible due to the fact that the response of the liquid crystal has a finite time.
- a sufficient phenomenon occurs.
- the time required for the change from low luminance to high luminance is longer than the time required for the change from high luminance to low luminance.
- the above phenomenon may occur at the timing when the potential of the pixel electrode changes to a low voltage when the signal applied to the pixel electrode has a negative polarity.
- the gate driver when the gate driver supplies the conduction signal to the arbitrary gate bus line, the highest voltage level among the voltage levels is set to the arbitrary auxiliary capacity bus line.
- a voltage signal having a higher voltage level can be supplied to the pixel electrode in the one scanning period, and subsequently, a voltage signal having a lower voltage level can be supplied.
- the potential applied to the pixel electrode can be gradually changed to a lower voltage. As a result, it is possible to suppress the phenomenon that the rise from the low luminance to the high luminance, which may occur in the normally black method, is insufficient.
- the auxiliary capacitor driver includes the auxiliary capacitor bus line connected to the nth gate bus line of the plurality of gate bus lines via the transistor and the capacitor;
- the rectangular voltage signal is synchronously supplied to the auxiliary capacitor bus line connected to the n + 1th gate bus line of the plurality of gate bus lines via the transistor and the capacitor.
- the auxiliary capacitance bus line connected to the nth gate bus line of the plurality of gate bus lines via the transistor and the capacitor, and the n + 1th of the plurality of gate bus lines.
- the rectangular voltage signal can be synchronously supplied to the auxiliary bus line connected to the gate bus line via the transistor and the capacitor, so that the auxiliary capacitor having a simpler configuration can be provided.
- the driver can further suppress the moving image blur phenomenon.
- the auxiliary capacitor driver includes the auxiliary capacitor bus line connected to the nth gate bus line of the plurality of gate bus lines via the transistor and the capacitor; Supplying the rectangular voltage signal synchronously to the auxiliary capacitor bus line connected to the n + 2th gate bus line of the plurality of gate bus lines via the transistor and the capacitor. preferable.
- the auxiliary capacitance driver includes the auxiliary capacitance bus line connected to the nth gate bus line of the plurality of gate bus lines via the transistor and the capacitor, and the plurality of gates. Since the rectangular voltage signal can be synchronously supplied to the auxiliary capacitor bus line connected to the n + 2th gate bus line of the bus line via the transistor and the capacitor, it is easier. With the auxiliary capacitor driver having a simple structure, the moving image blurring phenomenon can be suppressed while the occurrence of streaks in accordance with flicker and polarity inversion can be suppressed.
- the number of the plurality of gate bus lines is an even number
- the number of the plurality of auxiliary capacitance bus lines is half of the number of the gate bus lines
- the plurality of gate bus lines The other end of the capacitor connected to the 2k-1st (k is a natural number) gate bus line of the bus lines via the transistor and the 2kth gate bus line of the plurality of gate bus lines It is preferable that the other end of the capacitor connected via the transistor is connected to the kth auxiliary capacitor bus line among the plurality of auxiliary capacitor bus lines.
- the display panel having a simpler configuration can There is a further effect that the phenomenon of motion blur can be suppressed.
- the auxiliary capacitor driver includes an amplitude changing unit that changes the amplitude of the rectangular voltage signal.
- the auxiliary capacitor driver since the auxiliary capacitor driver includes the amplitude changing unit that changes the amplitude of the rectangular voltage signal, the phenomenon of moving image blur can be more effectively suppressed. There is an additional effect.
- the source driver supplies the source signal having a larger amplitude when the amplitude of the rectangular voltage signal is smaller, and the amplitude of the rectangular voltage signal is If larger, it is preferable to supply the source signal with a smaller amplitude.
- the source driver supplies the source signal having a larger amplitude, and when the amplitude of the rectangular voltage signal is larger. Since the source signal having a smaller amplitude can be supplied, even if the amplitude of the rectangular voltage signal is larger or the amplitude of the rectangular voltage signal is smaller, There is a further effect that the motion blur phenomenon can be effectively suppressed.
- the amplitude of the source signal is defined as the voltage level of the source signal at the time of positive polarity writing minus the voltage level of the source signal at the time of negative polarity writing (the same applies hereinafter).
- the positive polarity writing refers to the case where the conduction signal is supplied and the rectangular voltage signal is at the lowest voltage level, and the negative polarity writing is the time when the conduction signal is supplied. This refers to the case where the rectangular voltage signal has the highest voltage level (the same applies hereinafter).
- the display panel according to the present invention includes two auxiliary capacitor drivers, and the arbitrary auxiliary capacitor bus line includes two auxiliary capacitor bus lines formed on the same straight line through an insulating portion.
- One of the two auxiliary capacitor drivers is synchronized with the conduction signal with respect to one auxiliary capacitor bus line of the two auxiliary capacitor bus lines during the one scanning period.
- a rectangular voltage signal having a first voltage level and a second voltage level different from the first voltage level is supplied, and one of the two auxiliary capacitor drivers is the first auxiliary capacitor driver.
- the other one of the two auxiliary capacitance bus lines is synchronized with the conduction signal and the first voltage level and the first auxiliary capacitance bus line are synchronized with the conduction signal.
- a rectangular voltage signal consisting of pressure level different from the second voltage level may be supplied.
- the rectangular shape of the two auxiliary capacitance bus lines formed on the same straight line via the insulating portion is applied to the one auxiliary capacitance bus line by the one auxiliary capacitance driver.
- a voltage signal is supplied, and the rectangular voltage signal is supplied to the other auxiliary capacitor bus line by the other auxiliary capacitor driver.
- the pixel electrode connected to the one auxiliary capacitance bus line and the pixel electrode connected to the other auxiliary capacitance bus line are independent of each other from the rectangular shape. A voltage signal can be supplied.
- a pixel region including a pixel electrode connected to the one auxiliary capacitance bus line and a pixel region including a pixel electrode connected to the other one auxiliary capacitance bus line include: Since it is possible to display images with different effects of improving the motion blur phenomenon, it is possible to appeal the motion blur improvement effect of the present invention to the user. That is, there is a further effect that the effect of improving the moving image blur according to the present invention can be effectively shown to the user.
- the source driver includes the source bus line connected to the one auxiliary capacitor bus line via the capacitor and the transistor, and the other one auxiliary capacitor bus line.
- source signals having different amplitudes are supplied to the capacitor and the source bus line connected via the transistor.
- the source driver includes the source bus line connected to the one auxiliary capacitance bus line via the capacitor and the transistor, and the capacitor and the other auxiliary capacitance bus line to the source bus line. Since source signals having different amplitudes can be supplied to the source bus line connected via the transistor, the pixel electrode connected to the one auxiliary capacitor bus line and the other one By supplying the rectangular voltage signals to the pixel electrodes connected to the auxiliary capacitance bus line independently of each other, the one auxiliary voltage can be obtained while maintaining the same image visibility except for the moving image blur phenomenon. A pixel region having a pixel electrode connected to the capacitor bus line, and an image connected to the other auxiliary capacitor bus line.
- the pixel region including the electrodes can display images with different effects of improving the motion blur phenomenon, the user can more effectively appeal the motion blur improvement effect of the present invention to the user. Can do. That is, there is a further effect that the effect of improving the moving image blur according to the present invention can be more effectively appealed to the user.
- the length of the one auxiliary capacitor bus line is approximately 45% to approximately 55% of the length of the arbitrary auxiliary capacitor bus line. It is preferable that the length of one auxiliary capacity bus line is substantially equal to a length obtained by subtracting the length of the one auxiliary capacity bus line from the length of the arbitrary auxiliary capacity bus line.
- the arbitrary auxiliary capacity bus line has the one side within a range of ⁇ 5% from the center line that bisects the display unit for displaying an image on the display panel in parallel with the source bus line.
- the auxiliary capacity bus line is electrically separated from the other auxiliary capacity bus line.
- the luminance of the pixel region including the pixel electrode disposed on one half surface of the display unit and the luminance of the pixel region including the pixel electrode disposed on the other half surface are In one scanning period, each can be controlled independently. Further, since the load characteristic of the one auxiliary capacity bus line and the load characteristic of the other one auxiliary capacity bus line can be made substantially the same, the auxiliary capacity connected to the one auxiliary capacity bus line The configuration of the driver and the configuration of the auxiliary capacitance driver connected to the other auxiliary capacitance bus line can be made substantially the same.
- the one auxiliary capacitor driver includes first amplitude changing means for changing the amplitude of the rectangular voltage signal, and the other auxiliary capacitor is provided. It is preferable that the capacitor driver includes a second amplitude changing unit that changes the amplitude of the rectangular voltage signal.
- the one auxiliary capacitor driver includes the first amplitude changing unit that changes the amplitude of the rectangular voltage signal
- the other one auxiliary capacitor driver includes: Since the second amplitude changing means for changing the amplitude of the rectangular voltage signal is provided, the one auxiliary capacitor driver and the other auxiliary capacitor driver have different amplitudes.
- the rectangular voltage signal can be supplied.
- the one auxiliary capacitance driver and the other one auxiliary capacitance driver supply the rectangular voltage signals having different amplitudes, respectively.
- a pixel region having a pixel electrode connected to a bus line and a pixel region having a pixel electrode connected to the other auxiliary capacitor bus line display images having different effects of improving the moving image blur phenomenon. Therefore, the effect of improving the moving image blur according to the present invention can be appealed to the user. That is, there is a further effect that the effect of improving the moving image blur according to the present invention can be more effectively appealed to the user.
- the one auxiliary capacitor driver when the one auxiliary capacitor driver supplies the rectangular voltage signal having a smaller amplitude to the one auxiliary capacitor bus line,
- the source signal having a larger amplitude is supplied to the source bus line connected to the auxiliary capacity bus line via the capacitor and the transistor, and the one auxiliary capacity driver is supplied to the one auxiliary capacity bus line.
- the rectangular voltage signal having a larger amplitude is supplied, the source signal having a smaller amplitude with respect to the source bus line connected to the one auxiliary capacitor bus line via the capacitor and the transistor.
- the other one auxiliary capacitor driver has an amplitude on the other auxiliary capacitor bus line.
- the source signal having a larger amplitude than the source bus line connected to the other auxiliary capacitor bus line via the capacitor and the transistor When the smaller rectangular voltage signal is supplied, the source signal having a larger amplitude than the source bus line connected to the other auxiliary capacitor bus line via the capacitor and the transistor.
- the other auxiliary capacitor driver supplies the rectangular voltage signal having a larger amplitude to the other auxiliary capacitor bus line, the other auxiliary capacitor bus line is supplied to the other auxiliary capacitor bus line.
- the source signal having a smaller amplitude is supplied to the source bus line connected through the capacitor and the transistor.
- the capacitor and the transistor are connected to the one auxiliary capacitor bus line in accordance with the amplitude of the rectangular voltage signal supplied to the one auxiliary capacitor bus line by the one auxiliary capacitor driver.
- the rectangular shape which controls the amplitude of the source signal supplied from the source driver to the source bus line connected via the other bus, and the other one auxiliary capacitor driver supplies to the other auxiliary capacitor bus line.
- the amplitude of the source signal supplied by the source driver to the source bus line connected to the other auxiliary capacitor bus line via the capacitor and the transistor is controlled in accordance with the amplitude of the voltage signal of
- the one auxiliary capacity bus line can be provided with the same visibility of the image other than the motion blur phenomenon.
- the pixel region including the connected pixel electrode and the pixel region including the pixel electrode connected to the other one auxiliary capacitor bus line may display images having different effects of improving the motion blur phenomenon. it can. Therefore, it is possible to more effectively appeal to the user the effect of improving the moving image blur according to the present invention.
- the one end of the capacitor is connected to an nth gate bus line of the plurality of gate bus lines and an mth source bus line of the plurality of source lines.
- the other end of the capacitor is connected to an nth auxiliary capacitance bus line of the plurality of auxiliary capacitance bus lines, and the one end of the capacitor is connected to the transistor,
- the other of the capacitors One end is preferably connected to the (n-1) th auxiliary capacity bus line among the plurality of auxiliary capacity bus lines.
- liquid crystal display device including the display panel configured as described above is also included in the scope of the present invention.
- the driving method includes a plurality of gate bus lines, a plurality of source bus lines, a plurality of auxiliary capacitance bus lines, and a gate connected to an arbitrary gate bus line among the plurality of gate bus lines.
- a transistor connected to an arbitrary source bus line of the plurality of source bus lines, a pixel electrode connected to the drain of the transistor, and one end of the transistor in parallel with the pixel electrode A capacitor connected to the drain and the other end connected to any one of the plurality of auxiliary capacitance bus lines and to one end of each of the plurality of source bus lines, and the arbitrary source bus
- a source driver for supplying a source signal to the line and one end of each of the plurality of gate bus lines;
- a gate driver for sequentially supplying a conduction signal for conducting the transistor to the arbitrary gate bus line, a counter electrode facing the pixel electrode via a liquid crystal, and a counter connected to the counter electrode
- a driving method for driving a display panel including an electrode wiring and a counter electrode driver that supplies
- a voltage signal supply step of supplying a rectangular voltage signal having a second voltage level different from the first voltage level, and in the one scanning period, Period the rectangular voltage signal is said first voltage level, and, the second period is a voltage level, respectively, longer than the response time of the liquid crystal is characterized in that.
- the present invention includes a liquid crystal display device including the display panel in each of the above-described embodiments.
- the present invention can be suitably applied to a display panel that displays an image using liquid crystal.
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Abstract
Description
本発明の第1の実施形態に係る表示パネルの構成について、図1および図2を参照して説明する。図1は、本実施形態に係る表示パネル1の構成を示すブロック図である。表示パネル1は、アクティブマトリックス型の液晶表示パネルである。
以下では、図3の(a)~(d)、および、図4の(a)~(d)を参照して、本実施形態に係る表示パネル1の動作の第1の例について説明する。
V3=(VCS2-VCS1)×CCS/ΣC+V2
によって定まる。また、ΣCは、トランジスタMn,mのドレインに互いに並列に接続された容量の総和であり、本実施形態においては、具体的に、ΣC=CLC+CCSである。なお、上述のように、VCS1<VCS2であるので、電位V3は、電位V2よりも大きい。
V1=(VCS1-VCS2)×CCS/ΣC+V4
によって定まる。また、上述のように、VCS1<VCS2であるので、電位V1は、電位V4よりも小さい。
V02=(VCS2-VCS1)×CCS/ΣC+V01
によって定まる。上述のように、VCS1<VCS2であるので、電位V02は、電位V01よりも大きい。
ΔVLC=(VCS2-VCS1)×CCS/ΣC
を満たす。ここで、CCS/ΣC<1であるので、ΔVLC<(VCS2-VCS1)が導かれる。
VLC=-ΔVLC/2
となるように設定し、補助容量信号#CSLnの電位が電位VCS2である場合に、
VLC=ΔVLC/2
と設定することが望ましい。ここで、ΔVLC/2が前記閾値電圧VLCth以下、すなわち、
ΔVLC/2≦VLCth
であれば、補助容量信号#CSLnの電位が電位VCS1であっても、電位VCS2であっても、黒表示を行うことができる。しがたがって、
VCS2-VCS1≦2×VLCth
であれば、補助容量信号#CSLnの電位が電位VCS1であっても、電位VCS2であっても、黒表示を行うことができる。
以下では、図5の(a)~(d)、および、図6の(a)~(d)を参照して、本実施形態に係る表示パネル1の動作の第2の例について説明する。
V3’=(VCS2’-VCS1’)×CCS/ΣC+V2’
によって定まる。なお、上述のように、VCS1’<VCS2’であるので、電位V3’は、電位V2’よりも大きい。
V4’=(VCS3’-VCS2’)×CCS/ΣC+V3’
によって定まる。なお、上述のように、VCS2’<VCS3’であるので、電位V4’は、電位V3’よりも大きい。
V6’=(VCS2’-VCS3’)×CCS/ΣC+V5’
によって定まる。なお、上述のように、VCS2’<VCS3’であるので、電位V6’は、電位V5’よりも小さい。
V1’=(VCS1’-VCS2’)×CCS/ΣC+V6’
によって定まる。なお、上述のように、VCS1’<VCS2’であるので、電位V1’は、電位V6’よりも小さい。
V03’=(VCS3’-VCS2’)×CCS/ΣC+V01’
によって定まる。なお、上述のように、VCS2’<VCS3’であるので、電位V03’は、電位V01’よりも大きい。
以下では、図7の(a)~(d)、および、図8の(a)~(d)を参照して、本実施形態に係る表示パネル1の動作の第3の例について説明する。
V3’’=(VCS2’’-VCS1’’)×CCS/ΣC+V2’’
によって定まる。なお、上述のように、VCS1’’<VCS2’’であるので、電位V3’’は、電位V2’’よりも大きい。
V4’’=(VCS3’’-VCS2’’)×CCS/ΣC+V3’’
によって定まる。なお、上述のように、VCS2’’<VCS3’’であるので、電位V4’’は、電位V3’’よりも大きい。
V6’’=(VCS4’’-VCS3’’)×CCS/ΣC+V5’’
によって定まる。なお、上述のように、VCS4’’<VCS3’’であるので、電位V6’’は、電位V5’’よりも小さい。
V1’’=(VCS1’’-VCS4’’)×CCS/ΣC+V6’’
によって定まる。なお、上述のように、VCS1’’<VCS4’’であるので、電位V1’’は、電位V6’’よりも小さい。
V03’’=(VCS3’’-VCS2’’)×CCS/ΣC+V01’’
によって定まる。なお、上述のように、VCS2’’<VCS3’’であるので、電位V03’’は、電位V01’’よりも大きい。
以下では、図9の(a)~(d)を参照して、本実施形態に係る表示パネル1の動作の第4の例について説明する。
V13=(VCS12-VCS11)×CCS/ΣC+V12
によって定まる。なお、上述のように、VCS11<VCS12であるので、電位V13は、電位V12よりも大きい。
V14=(VCS11-VCS12)×CCS/ΣC+V11
によって定まる。なお、上述のように、VCS11<VCS12であるので、電位V14は、電位V11よりも小さい。
以下では、図10の(a)~(d)を参照して、本実施形態に係る表示パネル1の動作の第5の例について説明する。
V13’=(VCS12’-VCS11’)×CCS/ΣC+V12’
によって定まる。なお、上述のように、VCS11’<VCS12’であるので、電位V13’は、電位V12’よりも大きい。
V14’=(VCS13’-VCS12’)×CCS/ΣC+V13’
によって定まる。なお、上述のように、VCS13’<VCS12’であるので、電位V14’は、電位V13’よりも小さい。
V16’=(VCS11’-VCS12’)×CCS/ΣC+V15’
によって定まる。なお、上述のように、VCS11’<VCS12’であるので、電位V16’は、電位V15’よりも小さい。
以下では、図11の(a)~(d)を参照して、本実施形態に係る表示パネル1の動作の第6の例について説明する。
V13’’=(VCS12’’-VCS11’’)×CCS/ΣC+V12’’
によって定まる。なお、上述のように、VCS11’’<VCS12’’であるので、電位V13’’は、電位V12’’よりも大きい。
V14’’=(VCS13’’-VCS12’’)×CCS/ΣC+V13’’
によって定まる。なお、上述のように、VCS13’’<VCS12’’であるので、電位V14’’は、電位V13’’よりも小さい。
V16’’=(VCS11’’-VCS12’’)×CCS/ΣC+V15’’
によって定まる。なお、上述のように、VCS11’’<VCS12’’であるので、電位V16’’は、電位V15’’よりも小さい。
V17’’=(VCS14’’-VCS11’’)×CCS/ΣC+V16’’
によって定まる。なお、上述のように、VCS11’’<VCS14’’であるので、電位V17’’は、電位V16’’よりも大きい。
上述した動作例1~6においては、補助容量ドライバ14が、複数の補助容量バスラインCSL1~CSLNのそれぞれに対し、水平走査期間Th毎に補助容量信号#CSL1~#CSLNを順次供給する場合、すなわち、補助容量信号#CSLnと補助容量信号#CSLn+1との間に、水平走査期間Thの長さに対応する位相差が存在する場合を例に挙げ説明を行ったが、本発明はこれに限られるものではない。
実施形態1においては、表示パネル1が、N本のゲートバスラインGL1~GLN、および、N本の補助容量バスラインCSL1~CSLNを備える構成について説明を行ったが、本発明はこれに限られるものではない。
以下では、図22および図23を参照して、本発明の第3の実施形態に係る表示パネル3について説明する。
実施形態1~3においては、主に、ライン反転駆動方式に対する本発明の適用について説明を行ったが、本発明はこれに限定されるものではない。以下では、隣り合う画素電極に対して、互いに反対極性の電位が供給されるドット反転駆動方式に対して本発明を適用した場合について図24および図25を参照して説明を行う。
以上のように、本発明に係る表示パネルは、複数のゲートバスラインと、複数のソースバスラインと、複数の補助容量バスラインと、前記複数のゲートバスラインのうち任意のゲートバスラインに接続されたゲートと、前記複数のソースバスラインのうち任意のソースバスラインに接続されたソースとを備えたトランジスタと、前記トランジスタのドレインに接続された画素電極と、一端が前記画素電極と並列に前記トランジスタのドレインに接続され、他の一端が前記複数の補助容量バスラインのうち任意の補助容量バスラインに接続されたキャパシタと、前記複数のソースバスラインのそれぞれの一端に接続され、前記任意のソースバスラインに対してソース信号を供給するソースドライバと、前記複数のゲートバスラインのそれぞれの一端に接続され、前記トランジスタを導通させる導通信号を前記任意のゲートバスラインに対して逐次的に供給するゲートドライバと、液晶を介して前記画素電極に対向する対向電極と、前記対向電極に接続された対向電極用配線と、前記対向電極用配線に対して共通電位を供給する対向電極ドライバと、を備えた表示パネルであって、前記ゲートドライバが前記任意のゲートバスラインに対して前記導通信号を供給してから次の前記導通信号を供給するまでの1走査期間において、前記任意の補助容量バスラインに対し、前記導通信号に同期して、少なくとも第1の電圧レベルおよび前記第1の電圧レベルと異なる第2の電圧レベルからなる矩形状の電圧信号を供給する補助容量ドライバを備えており、前記1走査期間において、前記矩形状の電圧信号が前記第1の電圧レベルである期間、および、前記第2の電圧レベルである期間は、それぞれ、前記液晶の応答時間よりも長い、ことを特徴としている。
11 制御部
12 ソースドライバ
13 ゲートドライバ
14 補助容量ドライバ
15 対向電極ドライバ
16 表示部
SLm ソースバスライン
GLn ゲートバスライン
CSLn 補助容量バスライン
COML 対向電極用配線
Pn,m 画素領域
PEn,m 画素電極
Mn,m トランジスタ
ECOM 対向電極
Cn,m キャパシタ
CE1n,m 第1の補助容量電極
CE2n,m 第2の補助容量電極
Claims (31)
- 複数のゲートバスラインと、
複数のソースバスラインと、
複数の補助容量バスラインと、
前記複数のゲートバスラインのうち任意のゲートバスラインに接続されたゲートと、前記複数のソースバスラインのうち任意のソースバスラインに接続されたソースとを備えたトランジスタと、
前記トランジスタのドレインに接続された画素電極と、
一端が前記画素電極と並列に前記トランジスタのドレインに接続され、他の一端が前記複数の補助容量バスラインのうち任意の補助容量バスラインに接続されたキャパシタと、
前記複数のソースバスラインのそれぞれの一端に接続され、前記任意のソースバスラインに対してソース信号を供給するソースドライバと、
前記複数のゲートバスラインのそれぞれの一端に接続され、前記トランジスタを導通させる導通信号を前記任意のゲートバスラインに対して逐次的に供給するゲートドライバと、
液晶を介して前記画素電極に対向する対向電極と、
前記対向電極に接続された対向電極用配線と、
前記対向電極用配線に対して共通電位を供給する対向電極ドライバと、
を備えた表示パネルであって、
前記ゲートドライバが前記任意のゲートバスラインに対して前記導通信号を供給してから次の前記導通信号を供給するまでの1走査期間において、前記任意の補助容量バスラインに対し、前記導通信号に同期して、少なくとも第1の電圧レベルおよび前記第1の電圧レベルと異なる第2の電圧レベルからなる矩形状の電圧信号を供給する補助容量ドライバを備えており、
前記1走査期間において、前記矩形状の電圧信号が前記第1の電圧レベルである期間、および、前記第2の電圧レベルである期間は、それぞれ、前記液晶の応答時間よりも長い、
ことを特徴とする表示パネル。 - 前記矩形状の電圧信号は、前記1走査期間の少なくとも10パーセントの連続した期間において、前記第1の電圧レベルまたは前記第2の電圧レベルのうち一方の値の電圧レベルをとる、
ことを特徴とする請求項1に記載の表示パネル。 - 前記矩形状の電圧信号は、前記1走査期間の開始から前記1走査期間の略10パーセントの期間が経過するまでの期間において、前記第1の電圧レベルまたは前記第2の電圧レベルのうち一方の電圧レベルをとり、前記1走査期間の略90パーセントの期間が経過してから前記1走査期間が終了するまでの期間において、前記第1の電圧レベルまたは前記第2の電圧レベルのうち他の一方の電圧レベルをとる、
ことを特徴とする請求項1または2に記載の表示パネル。 - 前記1走査期間において、前記矩形状の電圧信号が前記第1の電圧レベルであるときの前記画素電極の電位と前記対向電極の電位との差によって表される前記液晶への印加電圧の極性と、前記矩形状の電圧信号が前記第2の電圧レベルであるときの前記画素電極の電位と前記対向電極の電位との差によって表される前記液晶への印加電圧の極性とは、互いに異なった極性である、
ことを特徴とする請求項1から3の何れか1項に記載の表示パネル。 - 前記第1の電圧レベルと、前記第2の電圧レベルとの電位差の絶対値は、液晶の閾値電圧の2倍以下である、
ことを特徴とする請求項1から4の何れか1項に記載の表示パネル。 - 前記補助容量ドライバは、前記1走査期間において、前記任意の補助容量バスラインに対し、前記導通信号に同期して、前記第1の電圧レベルと、前記第2の電圧レベルと、前記第1の電圧レベルおよび前記第2の電圧レベルの何れとも異なる第3の電圧レベルとからなる矩形状の電圧信号を供給する、
ことを特徴とする請求項1に記載の表示パネル。 - 前記矩形状の電圧信号は、前記1走査期間の少なくとも10パーセントの期間において、前記第1の電圧レベル、前記第2の電圧レベル、または、前記第3の電圧レベルのうち、何れかの電圧レベルをとる、
ことを特徴とする請求項6に記載の表示パネル。 - 前記矩形状の電圧信号は、前記1走査期間の開始から前記1走査期間の略10パーセントの期間が経過するまでの期間において、前記第1の電圧レベル、前記第2の電圧レベル、または、前記第3の電圧レベルのうち何れか1つの電圧レベルをとり、前記1走査期間の略90パーセントの期間が経過してから前記1走査期間が終了するまでの期間において、前記第1の電圧レベル、前記第2の電圧レベル、または、前記第3の電圧レベルのうち他の1つの電圧レベルをとる、
ことを特徴とする請求項6または7に記載の表示パネル。 - 前記1走査期間において、最初の前記電圧レベルの遷移後における前記画素電極の電位と前記対向電極の電位との差によって表される前記液晶への印加電圧の極性と、次の前記電圧レベルの遷移後における前記画素電極の電位と前記対向電極の電位との差によって表される前記液晶への印加電圧の極性とは、互いに異なった極性である、
ことを特徴とする請求項6から8の何れか1項に記載の表示パネル。 - 前記第1の電圧レベル、前記第2の電圧レベル、および、前記第3の電圧レベルのうち、最も高い電圧レベルと、前記第1の電圧レベル、前記第2の電圧レベル、および、前記第3の電圧レベルのうち、中間の電圧レベルとの電位差の絶対値は、液晶の閾値電圧の2倍以下である、
ことを特徴とする請求項6から9の何れか1項に記載の表示パネル。 - 前記補助容量ドライバは、前記1走査期間において、前記任意の補助容量バスラインに対し、前記導通信号に同期して、前記第1の電圧レベルと、前記第2の電圧レベルと、前記第1の電圧レベルおよび前記第2の電圧レベルの何れとも異なる第3の電圧レベルとからなる矩形状の電圧信号を供給し、前記1走査期間の次の1走査期間において、前記第1の電圧レベル、前記第2の電圧レベル、および、前記第3の電圧レベルのうち、何れか2つの電圧レベルと、前記第1の電圧レベル、前記第2の電圧レベル、および、前記第3の電圧レベルの何れとも異なる第4の電圧レベルとからなる矩形状の電圧信号を供給する、
ことを特徴とする請求項1に記載の表示パネル。 - 前記1走査期間における最初の前記電圧レベルの遷移の前後における前記電圧レベルの電位差の絶対値は、前記1走査期間における次の前記電圧レベルの遷移の前後における前記電圧レベルの電位差の絶対値よりも小さい、
ことを特徴とする請求項11に記載の表示パネル。 - 前記矩形状の電圧信号は、前記1走査期間の少なくとも10パーセントの期間において、前記第1の電圧レベル、前記第2の電圧レベル、前記第3の電圧レベル、または、前記第4の電圧レベルのうち、何れかの電圧レベルをとる、
ことを特徴とする請求項11または12に記載の表示パネル。 - 前記矩形状の電圧信号は、前記1走査期間の開始から前記1走査期間の略10パーセントの期間が経過するまでの期間において、前記第1の電圧レベル、前記第2の電圧レベル、前記第3の電圧レベル、または、前記第4の電圧レベルのうち何れか1つの電圧レベルをとり、前記1走査期間の略90パーセントの期間が経過してから前記1走査期間が終了するまでの期間において、前記第1の電圧レベル、前記第2の電圧レベル、前記第3の電圧レベル、または、前記第4の電圧レベルのうち他の1つの電圧レベルをとる、
ことを特徴とする請求項11から13の何れか1項に記載の表示パネル。 - 前記1走査期間において、最初の前記電圧レベルの遷移後における前記画素電極の電位と前記対向電極の電位との差によって表される前記液晶への印加電圧の極性と、次の前記電圧レベルの遷移後における前記画素電極の電位と前記対向電極の電位との差によって表される前記液晶への印加電圧の極性とは、互いに異なった極性である、
ことを特徴とする請求項11から14の何れか1項に記載の表示パネル。 - 前記第1の電圧レベル、前記第2の電圧レベル、前記第3の電圧レベル、および、前記第4の電圧レベルのうち、2番目に低い電圧レベルと、前記第1の電圧レベル、前記第2の電圧レベル、前記第3の電圧レベル、および、前記第4の電圧レベルのうち、最も高い電圧レベルとの電位差の絶対値は、液晶の閾値電圧の2倍以下である、
ことを特徴とする請求項11から15の何れか1項に記載の表示パネル。 - 前記ゲートドライバが前記任意のゲートバスラインに対して前記導通信号を供給したときに、前記任意の補助容量バスラインに対して前記電圧レベルのうち、最も低い電圧レベルが供給されている場合には、
前記補助容量ドライバは、前記任意の補助容量バスラインに対して、前記1走査期間において、前記電圧レベルが昇順である前記矩形状の電圧信号を供給する、
ことを特徴とする請求項1から16の何れか1項に記載の表示パネル。 - 前記ゲートドライバが前記任意のゲートバスラインに対して前記導通信号を供給したときに、前記任意の補助容量バスラインに対して前記電圧レベルのうち、最も高い電圧レベルが供給されている場合には、
前記補助容量ドライバは、前記任意の補助容量バスラインに対して、前記1走査期間において、前記電圧レベルが降順である前記矩形状の電圧信号を供給する、
ことを特徴とする請求項1から17の何れか1項に記載の表示パネル。 - 前記補助容量ドライバは、
前記複数のゲートバスラインのうちn番目のゲートバスラインに前記トランジスタ及び前記キャパシタを介して接続された前記補助容量バスラインと、
前記複数のゲートバスラインのうちn+1番目のゲートバスラインに前記トランジスタ及び前記キャパシタを介して接続された前記補助容量バスラインと、
に対し、
前記矩形状の電圧信号を同期して供給する、
ことを特徴とする請求項1から18の何れか1項に記載の表示パネル。 - 前記補助容量ドライバは、
前記複数のゲートバスラインのうちn番目のゲートバスラインに前記トランジスタ及び前記キャパシタを介して接続された前記補助容量バスラインと、
前記複数のゲートバスラインのうちn+2番目のゲートバスラインに前記トランジスタ及び前記キャパシタを介して接続された前記補助容量バスラインと、
に対し、
前記矩形状の電圧信号を同期して供給する、
ことを特徴とする請求項1から18の何れか1項に記載の表示パネル。 - 前記複数のゲートバスラインの本数は偶数であり、
前記複数の補助容量バスラインの本数は、前記ゲートバスラインの本数の半数であり、
前記複数のゲートバスラインのうち2k-1番目(kは自然数)のゲートバスラインに前記トランジスタを介して接続された前記キャパシタの前記他の一端と、
前記複数のゲートバスラインのうち2k番目のゲートバスラインに前記トランジスタを介して接続された前記キャパシタの前記他の一端とが、
前記複数の補助容量バスラインのうちk番目の補助容量バスラインに接続されている、
ことを特徴とする請求項1から18の何れか1項に記載の表示パネル。 - 前記補助容量ドライバは、前記矩形状の電圧信号の振幅の大きさを変更する振幅変更手段を備えている、
ことを特徴とする請求項1から21の何れか1項に記載の表示パネル。 - 前記ソースドライバは、前記矩形状の電圧信号の振幅がより小さい場合に、より振幅の大きな前記ソース信号を供給し、前記矩形状の電圧信号の振幅がより大きい場合に、より振幅の小さな前記ソース信号を供給する、
ことを特徴とする請求項22に記載の表示パネル。 - 2つの前記補助容量ドライバを備え、
前記任意の補助容量バスラインは、絶縁部を介して同一直線上に形成された2本の補助容量バスラインから構成され、
2つの前記補助容量ドライバのうち一方の前記補助容量ドライバは、
前記1走査期間において、前記2本の補助容量バスラインのうち一方の補助容量バスラインに対し、前記導通信号に同期して、第1の電圧レベルおよび前記第1の電圧レベルと異なる第2の電圧レベルからなる矩形状の電圧信号を供給し、
2つの前記補助容量ドライバのうち他の一方の前記補助容量ドライバは、
前記1走査期間において、前記2本の補助容量バスラインのうち他の一方の補助容量バスラインに対し、前記導通信号に同期して、第1の電圧レベルおよび前記第1の電圧レベルと異なる第2の電圧レベルからなる矩形状の電圧信号を供給する、
ことを特徴とする請求項1から23の何れか1項に記載の表示パネル。 - 前記ソースドライバは、
前記一方の補助容量バスラインに前記キャパシタおよび前記トランジスタを介して接続された前記ソースバスラインと、前記他の一方の補助容量バスラインに前記キャパシタおよび前記トランジスタを介して接続された前記ソースバスラインとに対し、それぞれ振幅の異なったソース信号を供給する、
ことを特徴とする請求項24に記載の表示パネル。 - 前記一方の補助容量バスラインの長さは、前記任意の補助容量バスラインの長さの略45パーセントから略55パーセントの長さであり、前記他の一方の補助容量バスラインの長さは、前記任意の補助容量バスラインの長さから前記一方の補助容量バスラインの長さを引いた長さに略等しい、ことを特徴とする請求項24または25に記載の表示パネル。
- 前記一方の補助容量ドライバは、前記矩形状の電圧信号の振幅の大きさを変更する第1の振幅変更手段を備えており、前記他の一方の補助容量ドライバは、前記矩形状の電圧信号の振幅の大きさを変更する第2の振幅変更手段を備えている、
ことを特徴とする請求項24から26の何れか1項に記載の表示パネル。 - 前記ソースドライバは、
前記一方の補助容量ドライバが前記一方の補助容量バスラインに振幅のより小さい前記矩形状の電圧信号を供給した場合には、前記一方の補助容量バスラインに前記キャパシタおよび前記トランジスタを介して接続された前記ソースバスラインに対して振幅のより大きい前記ソース信号を供給し、
前記一方の補助容量ドライバが前記一方の補助容量バスラインに振幅のより大きい前記矩形状の電圧信号を供給した場合には、前記一方の補助容量バスラインに前記キャパシタおよび前記トランジスタを介して接続された前記ソースバスラインに対して振幅のより小さい前記ソース信号を供給し、
前記他の一方の補助容量ドライバが前記他の一方の補助容量バスラインに振幅のより小さい前記矩形状の電圧信号を供給した場合には、前記他の一方の補助容量バスラインに前記キャパシタおよび前記トランジスタを介して接続された前記ソースバスラインに対して振幅のより大きい前記ソース信号を供給し、
前記他の一方の補助容量ドライバが前記他の一方の補助容量バスラインに振幅のより大きい前記矩形状の電圧信号を供給した場合には、前記他の一方の補助容量バスラインに前記キャパシタおよび前記トランジスタを介して接続された前記ソースバスラインに対して振幅のより小さい前記ソース信号を供給する、
ことを特徴とする請求項27に記載の表示パネル。 - 前記キャパシタの前記一端が、前記複数のゲートバスラインのうちn番目のゲートバスラインと、前記複数のソースラインのうちm番目のソースバスラインとに接続された前記トランジスタに接続されている場合には、前記キャパシタの前記他の一端は、前記複数の補助容量バスラインのうちn番目の補助容量バスラインに接続され、
前記キャパシタの前記一端が、前記複数のゲートバスラインのうちn番目のゲートバスラインと、前記複数のソースラインのうちm+1番目のソースバスラインとに接続された前記トランジスタに接続されている場合には、前記キャパシタの前記他の一端は、前記複数の補助容量バスラインのうちn-1番目の補助容量バスラインに接続されている、
ことを特徴とする請求項1から23の何れか1項に記載の表示パネル。 - 請求項1から29の何れか1項に記載の表示パネルを備えている、
ことを特徴とする液晶表示装置。 - 複数のゲートバスラインと、
複数のソースバスラインと、
複数の補助容量バスラインと、
前記複数のゲートバスラインのうち任意のゲートバスラインに接続されたゲートと、前記複数のソースバスラインのうち任意のソースバスラインに接続されたソースとを備えたトランジスタと、
前記トランジスタのドレインに接続された画素電極と、
一端が前記画素電極と並列に前記トランジスタのドレインに接続され、他の一端が前記複数の補助容量バスラインのうち任意の補助容量バスラインに接続されたキャパシタと、
前記複数のソースバスラインのそれぞれの一端に接続され、前記任意のソースバスラインに対してソース信号を供給するソースドライバと、
前記複数のゲートバスラインのそれぞれの一端に接続され、前記トランジスタを導通させる導通信号を前記任意のゲートバスラインに対して逐次的に供給するゲートドライバと、
液晶を介して前記画素電極に対向する対向電極と、
前記対向電極に接続された対向電極用配線と、
前記対向電極用配線に対して共通電位を供給する対向電極ドライバと、
を備えた表示パネルを駆動する駆動方法であって、
前記ゲートドライバが前記任意のゲートバスラインに対して前記導通信号を供給してから次の前記導通信号を供給するまでの1走査期間において、前記任意の補助容量バスラインに対し、前記導通信号に同期して、少なくとも第1の電圧レベルおよび前記第1の電圧レベルと異なる第2の電圧レベルからなる矩形状の電圧信号を供給する電圧信号供給工程を含んでおり、
前記1走査期間において、前記矩形状の電圧信号が前記第1の電圧レベルである期間、および、前記第2の電圧レベルである期間は、それぞれ、前記液晶の応答時間よりも長い、
ことを特徴とする駆動方法。
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| JP2011545113A JP5512698B2 (ja) | 2009-12-11 | 2010-09-22 | 表示パネル、液晶表示装置、および、駆動方法 |
| CN201080055862.4A CN102652334B (zh) | 2009-12-11 | 2010-09-22 | 显示面板、液晶显示装置和驱动方法 |
| US13/514,082 US20120242646A1 (en) | 2009-12-11 | 2010-09-22 | Display panel, liquid crystal display, and driving method |
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| WO2013018596A1 (ja) * | 2011-08-02 | 2013-02-07 | シャープ株式会社 | 液晶表示装置および補助容量線の駆動方法 |
| CN104217688B (zh) | 2013-05-31 | 2016-08-10 | 京东方科技集团股份有限公司 | 一种lcd面板及显示装置 |
| KR20150030907A (ko) * | 2013-09-13 | 2015-03-23 | 삼성디스플레이 주식회사 | 표시 기판의 제조 방법, 표시 패널 및 이를 포함하는 표시 장치 |
| CN104166266B (zh) * | 2014-07-24 | 2018-03-30 | 京东方科技集团股份有限公司 | 一种镜面显示装置控制方法、控制装置和控制系统 |
| US20180240392A1 (en) * | 2017-02-21 | 2018-08-23 | Solomon Systech Limited | Thin film transistor (tft) liquid crystal display (lcd) panel |
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- 2010-09-22 JP JP2011545113A patent/JP5512698B2/ja active Active
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- 2010-09-22 US US13/514,082 patent/US20120242646A1/en not_active Abandoned
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| JPWO2011070836A1 (ja) | 2013-04-22 |
| JP5512698B2 (ja) | 2014-06-04 |
| CN102652334A (zh) | 2012-08-29 |
| CN102652334B (zh) | 2014-12-03 |
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