JP2004046235A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which can suppress the occurrence of reverse transition in the case of using an OCB liquid crystal and can display excellent video. <P>SOLUTION: The liquid crystal display device is equipped with a liquid crystal display element which has a plurality of source lines supplied with pixel data, a plurality of gate lines supplied with a scanning signal, and transistors arranged in matrix corresponding to intersections of the source lines and gate lines and is so structured that one electrode of a liquid crystal cell and one electrode of an intentionally formed storage capacitor are arranged on the drain side of each transistor and the other electrode of the storage capacitor is wired to an electrode other than the the other electrode of the liquid crystal cell; and a voltage for video signal display is applied in a specified period in one frame period, a voltage different from the video signal display is applied in another specified period, and a voltage different from the video signal display is applied from one electrode of the storage capacitor as an electrode different from the source line. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a method of driving an active matrix type liquid crystal display device and a liquid crystal display device, and more particularly, to a method of driving a liquid crystal display device using an OCB (optically self-compensated birefringence) liquid crystal mode having a wide viewing angle and high-speed response. The present invention relates to a liquid crystal display device.

As is well known, liquid crystal display devices are widely used as screen display devices for computer devices and the like, but their use in TV applications is expected to expand in the future. However, the TN (Twisted Nematic) mode, which is currently widely used, has a narrow viewing angle and an insufficient response speed, and has a large display performance when used as a TV, such as a decrease in contrast due to parallax and blurring of a moving image. There are issues.

In recent years, research on the OCB liquid crystal mode has been advanced in place of the TN mode. OCB has characteristics such as a wide viewing angle and a high-speed response compared to TN, and can be said to be a liquid crystal mode more suitable for displaying a natural moving image.

Hereinafter, a conventional driving method of a liquid crystal display device and a liquid crystal display device will be described.

In FIG. 11, 101 is a gate line, 102 is a source line, 103 is a thin film transistor (hereinafter, referred to as TFT) as a switching element, and a drain electrode of the TFT is connected to a pixel electrode of a pixel. The pixel is composed of a liquid crystal 105 held between both the pixel electrode and the counter electrode 107 and a storage capacitor 104 formed between the pixel electrode and the counter electrode.

Hereinafter, the actual driving operation will be described with reference to FIG.

(4) The gate line potential Vg is sequentially turned on in synchronization with the supply of the data potential Vs to the source line. In this example, the phase of the voltage supplied to the source line has an opposite phase relationship for each source line or each frame. The difference between the voltage of the counter electrode and the voltage supplied to the source line and applied to each pixel is the voltage applied to both ends of the liquid crystal Clc in the pixel, and this determines the transmittance of the pixel.

Such a driving method is the same when the OCB cell is used and when the TN type cell is used. However, the OCB cell requires a unique drive that is not available in the TN cell at the start-up stage when video display is started.

The OCB cell has a bend orientation in which an image can be displayed and a splay orientation in which an image cannot be displayed. In order to shift from the splay alignment to the bend alignment (hereinafter, referred to as transition), a unique drive such as applying a high voltage for a certain period of time is required. However, the drive relating to this transition is not directly related to the present invention, and will not be described further.

However, even if the OCB cell once transitions to the bend orientation due to the unique driving described above, if a voltage of a predetermined level or more is not applied for a certain period of time or more, the bend orientation cannot be maintained and returns to the splay orientation ( Hereinafter, this phenomenon is called a reverse transition).

Therefore, an object of the present invention is to provide a driving method of a liquid crystal display device and a liquid crystal display device capable of suppressing occurrence of reverse transition and displaying a good image when using an OCB cell. is there.

In order to solve this problem, a first aspect of the present invention relates to a plurality of source lines to which pixel data is supplied, a plurality of gate lines to which a scanning signal is supplied, and an intersection of the source line and the gate line. Transistors arranged in a matrix, one electrode of a liquid crystal cell on the drain side of the transistor, and one electrode of a storage capacitor formed intentionally on the drain side of the transistor, A liquid crystal display element having a structure in which the other electrode is wired to an electrode different from the electrode on the opposite side of the liquid crystal cell, wherein the liquid crystal cell has an image display signal for a predetermined period within one frame period. A voltage different from the video display signal is applied for another predetermined period, and a voltage different from the video display signal is applied from one electrode of the storage capacitor which is an electrode different from the source line. Characterized in that it is a liquid crystal display device.

The second invention is different from the first invention in that a liquid crystal display element having a structure in which the other electrode of the storage capacitor is wired to another adjacent gate line is provided, and another voltage different from the video display signal is provided. Is applied from one electrode of a storage capacitor which is an electrode different from the source line.

A third invention is characterized in that, in the first or second invention, another voltage different from the video display signal is applied from an electrode on the opposite side of the liquid crystal cell, which is an electrode different from the source line. It is a liquid crystal display device.

A fourth aspect of the present invention is the liquid crystal display device according to the first to third aspects, further comprising a liquid crystal display element having a structure in which the other electrode of the storage capacitor is wired to the same electrode as the opposite electrode of the liquid crystal cell, A liquid crystal display device characterized in that another voltage different from the video display signal is applied from an electrode on the opposite side of the liquid crystal cell, which is an electrode different from the source line.

A fifth invention is an invention according to the first to fourth inventions, wherein the voltage amplitude supplied from the source line determines the voltage that determines the maximum of the liquid crystal transmittance and the minimum of the liquid crystal transmittance. A liquid crystal display device characterized in that the width is at least one time and less than twice the voltage.

A sixth invention is an invention according to the first to fourth inventions, wherein the voltage amplitude supplied from the source line determines the voltage that determines the maximum of the liquid crystal transmittance and the minimum of the liquid crystal transmittance. A liquid crystal display device characterized in that the width is at least twice the voltage and less than three times the voltage.

According to a seventh aspect, a plurality of source lines to which pixel data is supplied, a plurality of gate lines to which a scanning signal is supplied, and transistors arranged in a matrix corresponding to intersections of the source lines and the gate lines A liquid crystal display element having a structure in which one electrode of a liquid crystal cell is arranged on the drain side of the transistor, and one electrode of a storage capacitor formed intentionally on the drain side of the transistor; A rate converter for inputting a synchronized synchronization signal and converting the rate of one horizontal scanning period of the video signal to at least one and less than two times; a memory used for the rate conversion; and a source and gate driver driven from the synchronization signal A drive control unit for performing an operation, and a different voltage different from a video signal is supplied to a liquid crystal cell on a plurality of gate lines during a margin generated by the rate conversion. And applying a liquid crystal display device.

An eighth invention is an invention according to the seventh invention, further comprising a correction circuit for performing a predetermined correction for each gate line, wherein a period during which a video signal for each gate line is applied, A liquid crystal display device characterized by eliminating the influence of uneven brightness due to the variation in the ratio of the period during which another voltage different from the video signal is applied.

A ninth invention is an invention according to the seventh invention, wherein a rearrangement unit that rearranges the order of scanning the gate lines for each frame and rearranges the video signals in accordance with the rearrangement order is provided. A memory used for replacement, and eliminates the influence of uneven brightness due to the variation in the ratio between the period in which the video signal for each gate line is applied and the period in which another voltage different from the video signal is applied. A liquid crystal display device characterized in that:

A tenth invention is an invention according to the first to ninth inventions, wherein a period during which a video signal is applied in one frame period and another voltage different from the video signal are applied. It is characterized in that the ratio of the period during which it is present is variable.

The eleventh invention is an invention according to the first to tenth inventions, wherein the liquid crystal cell is an OCB cell.

According to the method for driving a liquid crystal display device and the liquid crystal display device of the present invention, after writing the data potential by the source line, the storage capacitor electrode potential is driven to a predetermined potential to prevent reverse transition, thereby reducing the screen brightness. The effect can be minimized.

Further, according to the driving method of the liquid crystal display device and the liquid crystal display device of the present invention, by driving the storage capacitor electrode potential to a predetermined potential, the AC inversion drive is performed while the source line is driven at the single potential. In addition, it is possible to prevent the reverse transition, and to minimize the influence of the reduction in the screen luminance. Further, in the above configuration, the drive potential of the source line can be made lower than that of the first embodiment, so that the cost of a circuit or a driver IC for driving the source line can be reduced.

Further, according to the driving method of the liquid crystal display device and the liquid crystal display device of the present invention, the reverse transition is prevented by driving the pre-stage gate potential to a predetermined potential after writing the data potential by the source line, thereby reducing the screen brightness. Can be minimized.

Further, according to the liquid crystal display device driving method and the liquid crystal display device of the present invention, the data potential writing time and the black insertion time of the video signal from the source line are reduced by a rate conversion to 1 / compared to the case where black is not inserted. It can be expanded to two or more and less than one. Therefore, it is possible to prevent shortage of the writing time to each pixel and increase of the transfer rate to the source driver due to the OCB-specific drive of preventing the reverse transition, thereby reducing the influence of the image quality deterioration or the burden on the circuit side. It is possible to reduce the size as much as possible.

(1st Embodiment)
1 and 2 are diagrams illustrating a configuration and a driving method of a liquid crystal display device according to a first embodiment of the present invention. In FIG. 1, 101 is a gate line, 102 is a source line, 103 is a TFT as a switching element, and a drain electrode of the TFT is connected to a pixel electrode of a pixel. The pixel is formed of a liquid crystal 105 held between both the pixel electrode and the counter electrode 107, and further includes a storage capacitor 104 formed between the drain electrode and the other electrode 106. You.

Hereinafter, the actual driving will be described with reference to FIG.

(4) In synchronization with the supply of the data potential Vs to the source line, the potential Vg of each gate line sequentially becomes the ON potential. In this example, the phase of the voltage supplied to the source line has an opposite phase relationship for each source line or each frame. The difference between the voltage of the counter electrode and the voltage supplied to the source line and applied to each pixel is the voltage applied to both ends of the liquid crystal in the pixel, and this determines the transmittance of the pixel.

The above is the case where the potential Ve of the electrode on the opposite side of the storage capacitor (hereinafter referred to as the storage capacitor electrode) is constant.

As shown in FIG. 2, if the storage capacitor electrode potential Ve is changed and maintained after the writing of the source line potential, for example, after a period of 80% of one frame, the potential applied to the liquid crystal via the storage capacitor can be manipulated. .

At this time, the change amount (accumulated potential) Vp of the potential applied to the liquid crystal is Cst as the storage capacitance, Clc as the liquid crystal capacitance, Cgd as the penetration capacitance between the gate and the drain (not shown), and Ve + as the change voltage of Ve. If Ve−, it is expressed by the following equation.

Vp = Cst / (Clc + Cst + Cgd) × (Ve + or Ve−) (1)
As described above, by controlling Ve + and Ve- to a predetermined potential, a potential higher than the potential necessary for preventing reverse transition can be applied to the liquid crystal in a certain period of one frame period.

That is, no matter what the potential of the liquid crystal written via the source immediately before it, the effective voltage can be greatly accumulated by Vp. Therefore, the reverse transition prevention voltage can be written without reducing the time required for writing the video.

(4) Reverse transfer is prevented by applying a potential equal to or higher than a certain potential for a certain ratio during one frame period, and a higher transmittance can be maintained as a result by using a potential lower than that of the conventional driving for display.

FIG. 4 shows a potential-transmittance curve of a general OCB. 4, reference numeral 401 denotes a potential-transmittance curve when a predetermined potential for preventing reverse transition is not inserted, 402 denotes a potential-transmittance curve when a predetermined potential for preventing reverse transition is inserted, and 403 denotes a reverse transition prevention. 404 is a potential at the highest transmittance (white potential), and 405 is a potential at the lowest transmittance (black potential). .

If the reverse transition is not prevented, an appropriate transmittance cannot be obtained because the orientation returns to the splay orientation below Vth. Therefore, it is necessary to drive at a potential higher than Vth. However, as shown in FIG. High brightness cannot be obtained.

According to the liquid crystal display device driving method and the liquid crystal display device according to the first embodiment of the present invention, after writing the data potential by the source line, the storage capacitor electrode potential is driven to a predetermined potential to prevent reverse transition. Thus, it is possible to minimize the influence of a decrease in screen brightness due to this.

(Second embodiment)
In the first embodiment, the AC inversion of the voltage applied to the liquid crystal is realized by the polarity inversion of the source line potential.

(4) To this end, it is necessary to supply a potential at least twice as wide as the highest potential 405 in FIG.

In this embodiment, a method of supplying a potential having a width one time greater than the highest potential 405 in FIG. 4 (hereinafter referred to as a one-time potential) and simultaneously performing an AC inversion drive and a reverse transition prevention drive to the liquid crystal. Is described.

First, the AC inversion driving of the source line at the single-fold potential will be described. As shown in FIG. 3, while the gate is turned on, the storage capacitor electrode potential Ve is temporarily increased or decreased, and the original potential is restored after the gate is turned off. By returning to the potential, the potential applied to the liquid crystal through the storage capacitor can be controlled. The change amount Vcc of the potential applied to the liquid crystal is expressed by the following equation, where Vge + or Vge− is the change voltage of Ve.

(2) Formula Vcc = Cst / (Clc + Cst + Cgd) × (Vge + or Vge−)
At this time, when the inversion operation is performed, for example, an operation such as bit inversion is performed so that the source line potential becomes −1 times in an AC manner.

駆 動 By performing the driving as described above, the AC inversion driving is performed while supplying the one-time potential as the source line potential.

Next, when the potential is further changed after the writing of the source line potential, for example, after a period of 80% of one frame, and the state is maintained, a potential higher than the potential required for preventing reverse transition is applied to the liquid crystal via the storage capacitor. be able to.

(4) The change amount Vp of the potential applied to the liquid crystal at that time can be expressed in the same manner as in equation (1), where the change voltage of Ve is Ve + or Ve-.

According to the liquid crystal display device driving method and the liquid crystal display device according to the second embodiment of the present invention, by driving the storage capacitor electrode potential to a predetermined potential, the source line is driven at the one-time potential and the It is possible to perform the inversion driving and prevent the reverse transition, thereby minimizing the influence of the reduction in the screen luminance.

In addition, in the above configuration, the drive potential of the source line can be made lower than that of the first embodiment, so that the cost of the circuit for driving the source line or the driver IC can be reduced.

(Third embodiment)
In the first and second embodiments, the operation has been described with the configuration in which the storage capacitor electrodes are individually driven.

In the third embodiment, a configuration in which a storage capacitor electrode is shared with another adjacent gate line (hereinafter, referred to as a pre-stage gate) will be described.

In FIG. 13, 1301, 1301a and 1301b are gate lines, 1302 and 1302a are source lines, and 1303 is a TFT as a switching element, and the drain electrode of the TFT is connected to the pixel electrode of the pixel. The pixel is formed of a liquid crystal 1305 held between both the pixel electrode and the counter electrode 1307 and further includes a storage capacitor 1304 formed between the drain electrode and the other storage capacitor electrode 1306. Be composed.

In this embodiment, the storage capacitor electrode 1306 is further connected to the previous gate 1301 which is an adjacent gate line.

In the former gate configuration as well, as shown in FIG. 14, when the former gate potential is changed after the writing of the source line potential, for example, after a lapse of 80% of one frame, the potential applied to the liquid crystal via the storage capacitor is changed. Can be operated.

According to the liquid crystal display device driving method and the liquid crystal display device according to the third embodiment of the present invention, after writing the data potential by the source line, the pre-stage gate potential is driven to a predetermined potential to prevent reverse transition, This makes it possible to minimize the influence of a decrease in screen luminance.

{Circle around (1)} By the former-stage gate configuration, the aperture ratio is generally higher than in the first embodiment, and the driving can be performed with fewer driving lines.

(Fourth embodiment)
In the first to third embodiments, a potential for preventing reverse transition is applied from one electrode of the storage capacitor via the storage capacitor.

In this embodiment mode, a potential for preventing reverse transition is applied from a counter electrode which is one electrode of liquid crystal.

As shown in FIG. 15, it can be seen that almost the same effects as in the first embodiment can be obtained. However, the potential change due to the counter electrode in the present embodiment is:
(3) Formula Vp = Clc / (Clc + Cst + Cgd) × (Ve + or Ve−)
It is represented by

(Fifth embodiment)
FIGS. 5 and 6 are views showing a configuration and a driving method of the liquid crystal display device according to the fifth embodiment.

In FIG. 5, reference numeral 501 denotes a source driver for driving a source line, 502 denotes a gate driver for driving a gate line, 503 denotes a liquid crystal panel in which sources, gates, TFTs, and pixels are arranged in a matrix, and 504 denotes a drive for driving the driver. A control unit 505 is a rate conversion unit that converts the rate of one horizontal scanning period of the video signal to 1 or more and less than 2 times, and 506 is a memory used for the rate conversion.

In FIG. 6, g0 to g17 represent the potential of each gate line, and Vs represents the source potential.

Hereinafter, the actual driving will be described with reference to the drawings.

(4) The input video signal is rate-converted by the rate converter using a memory. In the present embodiment, 6 horizontal periods are converted into 36/7 horizontal periods by 7 / 6-times rate conversion. In other words, one horizontal period is 6/7, and therefore, every 6 horizontal periods, 6/7 of the horizontal period can be provided. A high potential such as a black level can be written into the liquid crystal within this extra time.

ゲ ー ト As shown in the figure, each gate line switches between turning on one line at a time with a video signal and a high potential such as a black level, or selecting and turning on a plurality of lines simultaneously, in accordance with the timing of the rate conversion.

When attention is paid to one pixel, driving of inserting a high potential such as a black level (hereinafter referred to as black insertion) and writing of a video signal are alternately repeated at regular intervals in one frame cycle. . In this black insertion, selective writing is performed collectively for six lines in this example.

According to the driving method of the liquid crystal display device and the liquid crystal display device according to the embodiment of the present invention, by driving in this manner, the data potential writing time of the video signal from the source line and the black insertion time can be reduced by the rate conversion. Compared to the case where no insertion is made, it can be expanded to 以上 or more and less than 1. Therefore, it is possible to prevent shortage of the writing time to each pixel and increase of the transfer rate to the source driver due to the OCB-specific drive of preventing the reverse transition, thereby reducing the influence of the image quality deterioration or the burden on the circuit side. It is possible to minimize the size.

In this example, the rate conversion is configured to be 7/6 times. However, it is sufficient that (n + 1) / n times (n = 2, 3, 4,...), And is not fixed to n = 6. .

Also, although the black writing and the video writing on the g0 line are performed at a distance of seven line scanning times for simplicity of the explanatory diagram, the distance is not limited to seven lines. Specifically, the optimal black insertion time for preventing the reverse transition must be changed for each system such as when the liquid crystal material is changed.

(Sixth embodiment)
FIG. 8 is a diagram illustrating a configuration of a liquid crystal display device according to the sixth embodiment.

8, reference numeral 501 denotes a source driver for driving a source line, 502 denotes a gate driver for driving a gate line, 503 denotes a liquid crystal panel in which sources, gates, TFTs, and pixels are arranged in a matrix, and 504 denotes a drive for driving the driver. A control unit; 505, a rate conversion unit that converts the rate of one horizontal scanning period of the video signal to one or more times less than twice; 506, a memory used for the rate conversion; and 801, a video signal in accordance with the timing of the rate conversion. A luminance correction unit that performs luminance correction by using

Hereinafter, the actual driving will be described with reference to the drawings.

駆 動 The driving and rate conversion of each driver are the same as in the third embodiment. However, in the fifth embodiment, as shown in FIG. 6, the black insertion time differs between the g0 line and the g1 to g5 lines, and the difference is most remarkable between the g0 line and the g5 line. As shown in FIG. 7, these are displayed as luminance differences, and in the fifth embodiment, they are recognized as luminance unevenness every six lines.

(4) In order to solve the above problem, the 801 luminance correction unit performs a correction process for correcting the influence on luminance, which is obtained in advance through experiments or the like. The method of correction can be performed by a known technique such as a method using a table, a method using a multiplier, or the like, and thus details are not described here.

As described above, by performing the correction for each gate line on the video signal, it is possible to correct the variation of the black insertion time for each gate and eliminate the influence of the luminance unevenness for each gate.

(Seventh embodiment)
FIGS. 9 and 10 are diagrams showing the configuration and driving method of the liquid crystal display device according to the seventh embodiment. In FIG. 10, reference numeral 501 denotes a source driver for driving a source line, 502 denotes a gate driver for driving a gate line, 503 denotes a liquid crystal panel in which sources, gates, TFTs, and pixels are arranged in a matrix, and 504 denotes a drive for driving the driver. A control unit 1001 performs a rate conversion of one horizontal scanning period of a video signal to 1 or more times and less than 2 times, and performs a reordering for each frame. A reference numeral 506 denotes a memory used for the reordering and the rate conversion.

Hereinafter, the actual driving will be described with reference to the drawings.

In the sixth embodiment, the configuration is such that the luminance unevenness is eliminated by correcting the video signal. However, in this example, the scanning order is exchanged for each frame to equalize the average for each gate, and for each gate, This eliminates the effect of uneven brightness.

In FIG. 9A, in the first frame, scanning is performed in the direction from g0 to g5 and in the direction from g11 to g6, and in the second frame, scanning is performed in the direction from g5 to g0 and in the direction from g6 to g11. (From g12, g0 to g11 are repeated).

駆 動 By driving in this manner, the average of the first and second frames during the black insertion time of g0 becomes the same as the average of the other gate lines. Also, the discontinuity between the g5 and g6 lines is taken into account at the same time.

た め In order to perform such scanning, the 1001 rearranging unit performs rearrangement and rate conversion of the video signal in accordance with the above scanning order. It is known that such rate conversion and rearrangement are performed with the same configuration, and thus details are not described here.

As described above, by changing the scanning order for each frame, the variation in the black insertion time for each gate can be made uniform, and the effect of luminance unevenness for each gate can be eliminated.

INDUSTRIAL APPLICABILITY As described above, the present invention is useful as a driving method of an active matrix type liquid crystal display device and a liquid crystal display device, and in particular, a driving method of a liquid crystal display device using an OCB liquid crystal mode having a wide viewing angle and high-speed response. And a liquid crystal display device.

FIG. 1 is a diagram illustrating a configuration of a liquid crystal display device according to a first embodiment of the present invention. Explanatory drawing of the driving method of the liquid crystal display device according to the first embodiment of the present invention. Explanatory drawing of a driving method of a liquid crystal display device according to a second embodiment of the present invention. Diagram showing OCB potential versus transmittance FIG. 14 is a block diagram illustrating a configuration of a liquid crystal display device according to a fifth embodiment of the present invention. Explanatory drawing of a driving method of a liquid crystal display device according to a fifth embodiment of the present invention. FIG. 14 is a diagram illustrating luminance unevenness for each line according to the fifth embodiment of the present invention. FIG. 16 is a block diagram illustrating a configuration of a liquid crystal display device according to a sixth embodiment of the present invention. Explanatory drawing of a driving method of a liquid crystal display device according to a seventh embodiment of the present invention. FIG. 17 is a block diagram illustrating a configuration of a liquid crystal display device according to a seventh embodiment of the present invention. Configuration diagram of a liquid crystal display device according to a conventional embodiment Explanatory diagram of a driving method of a liquid crystal display device according to a conventional embodiment FIG. 9 is a block diagram illustrating a configuration of a liquid crystal display device according to a third embodiment of the present invention. Explanatory drawing of a driving method of a liquid crystal display device according to a third embodiment of the present invention. Explanatory drawing of a driving method of a liquid crystal display device according to a fourth embodiment of the present invention.

Explanation of reference numerals

101 gate line 102 source line 103 TFT
104 storage capacitor 105 liquid crystal 106 storage capacitor one side electrode 107 common electrode

Claims (11)

A plurality of source lines to which pixel data is supplied;
A plurality of gate lines to which a scanning signal is supplied;
Transistors arranged in a matrix corresponding to the intersection of the source line and the gate line;
One electrode of a liquid crystal cell and one electrode of a storage capacitor intentionally formed are arranged on the drain side of the transistor, and the other electrode of the storage capacitor is a different electrode from the electrode on the opposite side of the liquid crystal cell. A liquid crystal display element having a structure wired to
A voltage for a video display signal is applied from the source line to the liquid crystal cell for a predetermined period in one frame period, and another voltage different from the video display signal is applied for another predetermined period, A liquid crystal display device, wherein a voltage different from a display signal is applied from one electrode of the storage capacitor, which is an electrode different from the source line. A plurality of source lines to which pixel data is supplied;
A plurality of gate lines to which a scanning signal is supplied;
Transistors arranged in a matrix corresponding to the intersection of the source line and the gate line;
It has a structure in which one electrode of a liquid crystal cell and one electrode of a storage capacitor intentionally formed are arranged on the drain side of the transistor, and the other electrode of the storage capacitor is wired to another adjacent gate line. A liquid crystal display element,
A voltage for a video display signal is applied from the source line to the liquid crystal cell for a predetermined period in one frame period, and another voltage different from the video display signal is applied for another predetermined period, A liquid crystal display device, wherein a voltage different from a display signal is applied from one electrode of the storage capacitor, which is an electrode different from the source line. A plurality of source lines to which pixel data is supplied;
A plurality of gate lines to which a scanning signal is supplied;
Transistors arranged in a matrix corresponding to the intersection of the source line and the gate line;
One electrode of a liquid crystal cell and one electrode of a storage capacitor intentionally formed are arranged on the drain side of the transistor, and the other electrode of the storage capacitor is a different electrode from the electrode on the opposite side of the liquid crystal cell. A liquid crystal display element having a structure wired to
A voltage for a video display signal is applied from the source line to the liquid crystal cell for a predetermined period in one frame period, and another voltage different from the video display signal is applied for another predetermined period, A liquid crystal display device, wherein a voltage different from a display signal is applied from an electrode on the opposite side of the liquid crystal cell, which is an electrode different from the source line. A plurality of source lines to which pixel data is supplied;
A plurality of gate lines to which a scanning signal is supplied;
Transistors arranged in a matrix corresponding to the intersection of the source line and the gate line;
One electrode of a liquid crystal cell and one electrode of a storage capacitor intentionally formed are arranged on the drain side of the transistor, and the other electrode of the storage capacitor is wired to the same electrode as the opposite electrode of the liquid crystal cell. A liquid crystal display element having a structure as described above,
A voltage for a video display signal is applied from the source line to the liquid crystal cell for a predetermined period in one frame period, and another voltage different from the video display signal is applied for another predetermined period, A liquid crystal display device, wherein a voltage different from a display signal is applied from an electrode on the opposite side of the liquid crystal cell, which is an electrode different from the source line. The voltage amplitude supplied from the source line is a width that is at least 1 and less than 2 times the difference between the voltage that determines the maximum transmittance of the liquid crystal and the voltage that determines the minimum transmittance of the liquid crystal. 5. The liquid crystal display device according to any one of 4. The voltage amplitude supplied from the source line is a width which is twice or more and less than three times a difference between a voltage for determining the maximum transmittance of the liquid crystal and a voltage for determining the minimum transmittance of the liquid crystal. 5. The liquid crystal display device according to any one of 4. A plurality of source lines to which pixel data is supplied;
A plurality of gate lines to which a scanning signal is supplied;
Transistors arranged in a matrix corresponding to the intersection of the source line and the gate line;
A liquid crystal display element having a structure in which one electrode of a liquid crystal cell and one electrode of a storage capacitor intentionally formed are arranged on the drain side of the transistor;
A rate conversion unit that inputs a video signal and a synchronization signal synchronized with the video signal and converts the rate of one horizontal scanning period of the video signal to at least 1 and less than 2 times;
A memory used for the rate conversion,
A drive control unit that performs a drive operation of a source and a gate driver from the synchronization signal,
A liquid crystal display device characterized in that another voltage different from a video signal is applied to liquid crystal cells on a plurality of gate lines during a margin time generated by the rate conversion. It has a correction unit for performing a predetermined correction for each gate line, the ratio of the period during which a video signal for each gate line is applied and the period during which another voltage different from the video signal is applied 7. The liquid crystal display device according to claim 6, wherein the influence of uneven brightness due to the variation is eliminated. A rearrangement unit that rearranges the order in which the gate lines are scanned for each frame, rearranges video signals according to the rearrangement order, and a memory used for the rearrangement;
The average of the ratio of the ratio of the period during which the video signal for each gate line is applied and the period during which another voltage different from the video signal is applied is uniformed for each gate, and the luminance of each gate is uniformed. 7. The liquid crystal display device according to claim 6, wherein the influence of unevenness is eliminated. 10. The ratio of a period during which a video signal is applied to a period during which another voltage different from the video signal is applied in one frame period is variable. The liquid crystal display device according to any one of the above. The liquid crystal display device according to any one of claims 1 to 10, wherein the liquid crystal cell is an OCB cell.

Images