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TWI696991B - Display device and driving method thereof - Google Patents

Display device and driving method thereof Download PDF

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Publication number
TWI696991B
TWI696991B TW108117475A TW108117475A TWI696991B TW I696991 B TWI696991 B TW I696991B TW 108117475 A TW108117475 A TW 108117475A TW 108117475 A TW108117475 A TW 108117475A TW I696991 B TWI696991 B TW I696991B
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liquid crystal
crystal capacitor
coupled
switching element
display device
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TW108117475A
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TW202044222A (en
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朱恒沂
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友達光電股份有限公司
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Priority to CN202010013499.5A priority patent/CN111061107B/en
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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
    • G02F1/136—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
    • G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
    • 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
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

A display device and a driving method thereof are provided. When a pixel unit is in a data holding period, a voltage value of a compensation signal on a common line is adjusted according to a data signal and a grayscale value of a image data stored in a liquid crystal capacitance.

Description

顯示裝置及其驅動方法Display device and its driving method

本發明是有關於一種電子裝置，且特別是有關於一種顯示裝置及其驅動方法。The invention relates to an electronic device, and in particular to a display device and a driving method thereof.

隨著顯示科技的日益進步，人們藉著顯示器的輔助可使生活更加便利，為求顯示器輕、薄之特性，因此平面顯示器（Flat Panel Display, FPD）成為目前的主流，其中又以液晶顯示器（Liquid Crystal Display, LCD）最受歡迎。為了增進顯示面板之顯示品質，往往將顯示面板驅動訊號之極性反轉（inversion）。例如，薄膜電晶體液晶顯示器（TFT-LCD）之顯示面板採用液晶作為控制顯示的材料，為了避免液晶極化，需要以交流方式驅動之，發展出例如線反轉(Line Inversion)、點反轉(Dot Inversion)、列反轉(Column Inversion)等等各類極性反轉驅動方法。With the advancement of display technology, people can make life more convenient with the help of the display. In order to make the display light and thin, flat panel display (FPD) has become the current mainstream. Among them, liquid crystal displays ( Liquid Crystal Display, LCD) is the most popular. In order to improve the display quality of the display panel, the polarity of the display panel drive signal is often inverted. For example, the display panel of a thin-film transistor liquid crystal display (TFT-LCD) uses liquid crystal as the material for controlling the display. In order to avoid the polarization of the liquid crystal, it needs to be driven by the AC method, such as line inversion (line inversion) and dot inversion (Dot Inversion), column inversion (Column Inversion) and other types of polarity inversion driving methods.

由於顯示面板中的每一畫素都存在液晶電容，而資料線傳送至各畫素的電壓和極性會與相鄰畫素的電壓和極性不同，資料線與液晶電容之間將會產生耦合效應，使得液晶電容所保持之電壓差產生變化而呈現出非預期的灰階，進而在顯示面板上造成上下亮度不均勻的現象，亦即出現垂直串音的情形。Since each pixel in the display panel has a liquid crystal capacitor, and the voltage and polarity transmitted to each pixel by the data line will be different from the voltage and polarity of the adjacent pixels, there will be a coupling effect between the data line and the liquid crystal capacitor In this way, the voltage difference held by the liquid crystal capacitor changes to show an unexpected gray scale, which in turn causes uneven brightness on the display panel, that is, vertical crosstalk.

本發明提供一種顯示裝置及其驅動方法，可有效改善垂直串音的問題，大幅提高顯示裝置的顯示品質。The invention provides a display device and a driving method thereof, which can effectively improve the problem of vertical crosstalk and greatly improve the display quality of the display device.

本發明的顯示裝置包括閘極驅動器、源極驅動器以及多個畫素單元。其中各個畫素單元包括掃描線、資料線、共用線、第一開關元件、第一液晶電容、第二開關元件、第二液晶電容以及第三開關元件。掃描線耦接閘極驅動器。資料線耦接源極驅動器，接收源極驅動器提供的資料信號。共用線耦接源極驅動器，接收源極驅動器提供的補償信號。第一開關元件的第一端耦接資料線，第一開關元件的控制端耦接掃描線。第一液晶電容耦接於第一開關元件的第二端與共同電壓之間，其中資料線與第一液晶電容的畫素電極間具有第一寄生電容，第一液晶電容的畫素電極與共用線之間具有第二寄生電容。第二開關元件的第一端耦接資料線，第二開關元件的控制端耦接掃描線。第二液晶電容耦接於第二開關元件的第二端與共同電壓之間。第三開關元件的第一端耦接第二開關元件的第二端，第三開關元件的控制端耦接至掃描線，第三開關元件的第二端耦接源極驅動器以接收補償信號，於各畫素單元的資料保持期間，源極驅動器依據資料信號與第一液晶電容儲存的影像資料的灰階值調整補償信號的電壓值。The display device of the present invention includes a gate driver, a source driver, and a plurality of pixel units. Each pixel unit includes a scanning line, a data line, a common line, a first switching element, a first liquid crystal capacitor, a second switching element, a second liquid crystal capacitor, and a third switching element. The scan line is coupled to the gate driver. The data line is coupled to the source driver and receives the data signal provided by the source driver. The common line is coupled to the source driver and receives the compensation signal provided by the source driver. The first end of the first switching element is coupled to the data line, and the control end of the first switching element is coupled to the scanning line. The first liquid crystal capacitor is coupled between the second terminal of the first switching element and the common voltage, wherein the data line and the pixel electrode of the first liquid crystal capacitor have a first parasitic capacitance, and the pixel electrode of the first liquid crystal capacitor is shared There is a second parasitic capacitance between the lines. The first end of the second switching element is coupled to the data line, and the control end of the second switching element is coupled to the scanning line. The second liquid crystal capacitor is coupled between the second end of the second switching element and the common voltage. The first end of the third switching element is coupled to the second end of the second switching element, the control end of the third switching element is coupled to the scan line, and the second end of the third switching element is coupled to the source driver to receive the compensation signal, During the data holding period of each pixel unit, the source driver adjusts the voltage value of the compensation signal according to the data signal and the gray level value of the image data stored in the first liquid crystal capacitor.

在本發明的一實施例中，其中於各畫素單元的資料保持期間，當第一液晶電容儲存的影像資料的灰階值低於預設灰階值時，源極驅動器將補償信號調整為交流信號，當第一液晶電容儲存的影像資料的灰階值未低於預設灰階值時，補償信號為直流信號。In an embodiment of the present invention, during the data retention period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than the preset gray level value, the source driver adjusts the compensation signal to For the AC signal, when the gray level value of the image data stored in the first liquid crystal capacitor is not lower than the preset gray level value, the compensation signal is a DC signal.

在本發明的一實施例中，其中於各畫素單元的資料保持期間，當第一液晶電容儲存的影像資料的灰階值低於預設灰階值時，補償信號與資料信號反相。In an embodiment of the present invention, during the data holding period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than the preset gray level value, the compensation signal and the data signal are inverted.

在本發明的一實施例中，其中於各畫素單元的資料保持期間，當第一液晶電容儲存的影像資料的灰階值低於預設灰階值時，補償信號的電壓值關聯於資料信號的電壓值以及第一寄生電容與第二寄生電容的比值。In an embodiment of the present invention, during the data retention period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than the preset gray level value, the voltage value of the compensation signal is associated with the data The voltage value of the signal and the ratio of the first parasitic capacitance to the second parasitic capacitance.

在本發明的一實施例中，上述的第一液晶電容儲存的影像資料的灰階值介於0~255之間，預設灰階值為96。In an embodiment of the invention, the gray scale value of the image data stored in the first liquid crystal capacitor is between 0 and 255, and the preset gray scale value is 96.

本發明還提供一種顯示裝置的驅動方法，顯示裝置包括多個畫素單元，各畫素單元包括第一開關元件、第二開關元件、第三開關元件、第一液晶電容以及第二液晶電容，其中第一開關元件耦接於資料線與第一液晶電容之間，第二開關元件耦接於資料線與第二液晶電容之間，第三開關元件耦接於第二液晶電容與共用線之間，資料線與第一液晶電容的畫素電極間具有第一寄生電容，第一液晶電容的畫素電極與共用線之間具有第二寄生電容，顯示裝置的驅動方法包括下列步驟。判斷畫素單元是否處於資料保持期間。若畫素單元處於資料保持期間，判斷第一液晶電容儲存的影像資料的灰階值是否小於預設灰階值。若第一液晶電容儲存的影像資料的灰階值小於預設灰階值，透過共用線提供具有交流電壓的補償信號。若第一液晶電容儲存的影像資料的灰階值未小於預設灰階值，透過共用線提供具有直流電壓的補償信號。The invention also provides a driving method of a display device. The display device includes a plurality of pixel units, and each pixel unit includes a first switching element, a second switching element, a third switching element, a first liquid crystal capacitor, and a second liquid crystal capacitor. The first switching element is coupled between the data line and the first liquid crystal capacitor, the second switching element is coupled between the data line and the second liquid crystal capacitor, and the third switching element is coupled between the second liquid crystal capacitor and the common line Between the data line and the pixel electrode of the first liquid crystal capacitor, there is a first parasitic capacitance, and the pixel electrode of the first liquid crystal capacitor and the common line have a second parasitic capacitance. The driving method of the display device includes the following steps. Determine whether the pixel unit is in the data retention period. If the pixel unit is in the data holding period, it is determined whether the gray scale value of the image data stored in the first liquid crystal capacitor is less than the preset gray scale value. If the gray level value of the image data stored in the first liquid crystal capacitor is less than the preset gray level value, a compensation signal having an AC voltage is provided through the common line. If the gray scale value of the image data stored in the first liquid crystal capacitor is not less than the preset gray scale value, a compensation signal having a DC voltage is provided through the common line.

在本發明的一實施例中，其中於畫素單元的資料保持期間，當第一液晶電容儲存的影像資料的灰階值低於預設灰階值時，補償信號與資料信號反相。In an embodiment of the present invention, during the data retention period of the pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than the preset gray level value, the compensation signal and the data signal are inverted.

在本發明的一實施例中，其中於各畫素單元的資料保持期間，當第一液晶電容儲存的影像資料的灰階值低於預設灰階值時，補償信號的電壓值關聯於資料信號的電壓值以及第一寄生電容與第二寄生電容的比值。In an embodiment of the present invention, during the data retention period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than the preset gray level value, the voltage value of the compensation signal is associated with the data The voltage value of the signal and the ratio of the first parasitic capacitance to the second parasitic capacitance.

在本發明的一實施例中，上述的第一液晶電容儲存的影像資料的灰階值介於0~255之間，預設灰階值為96。In an embodiment of the invention, the gray scale value of the image data stored in the first liquid crystal capacitor is between 0 and 255, and the preset gray scale value is 96.

基於上述，本發明的實施例在畫素單元處於資料保持期間時，依據資料信號以及第一液晶電容儲存的影像資料的灰階值調整共用線上的補償信號的電壓值，以避免液晶電容所保持的電壓差因資料線與液晶電容間的耦合效應產生變化，而可有效地改善垂直串音的問題，大幅提高顯示裝置的顯示品質。Based on the above, the embodiment of the present invention adjusts the voltage value of the compensation signal on the common line according to the data signal and the gray level value of the image data stored in the first liquid crystal capacitor when the pixel unit is in the data holding period to avoid the liquid crystal capacitor from being held The voltage difference varies due to the coupling effect between the data line and the liquid crystal capacitor, which can effectively improve the problem of vertical crosstalk and greatly improve the display quality of the display device.

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below and described in detail in conjunction with the accompanying drawings.

圖1是是依照本發明實施例的一種顯示裝置的示意圖。請參照圖1，顯示裝置包括閘極驅動器102、源極驅動器104以及顯示面板106，顯示面板106耦接閘極驅動器102與源極驅動器104。顯示面板106包括多個畫素單元108，進一步來說，各個畫素單元108的電路結構可例如圖2所示，此外畫素單元108的佈局則可如圖3所示，圖4則為本發明實施例之畫素單元的剖面示意圖，圖4之畫素單元的剖面對應圖3的剖線A-A’。FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. 1, the display device includes a gate driver 102, a source driver 104 and a display panel 106. The display panel 106 is coupled to the gate driver 102 and the source driver 104. The display panel 106 includes a plurality of pixel units 108. Further, the circuit structure of each pixel unit 108 may be shown in FIG. 2, for example, and the layout of the pixel unit 108 may be shown in FIG. 3, and FIG. 4 is based on A schematic cross-sectional view of a pixel unit according to an embodiment of the invention. The section of the pixel unit in FIG. 4 corresponds to the section line AA′ in FIG. 3.

請同時參照圖2、圖3及圖4，畫素單元108包括掃描線SL、資料線DL、共用線TL、開關元件SW1~SW3以及液晶電容CLC1、CLC2。開關元件SW1耦接於資料線DL與液晶電容CLC1之間，開關元件SW1的控制端耦接掃描線SL，如圖3所示，開關元件SW1連接資料線DL並透過接觸窗C1耦接液晶電容CLC1的畫素電極302。液晶電容CLC1耦接於開關元件SW1與共同電壓Vcom之間。開關元件SW2耦接於資料線DL與液晶電容CLC2之間，開關元件SW2的控制端耦接掃描線SL，如圖3所示，開關元件SW2連接資料線DL並透過接觸窗C2耦接液晶電容CLC2的畫素電極。液晶電容CLC2耦接於開關元件SW2與共同電壓Vcom之間。開關元件SW3耦接於液晶電容CLC2的畫素電極與補償信號的電壓V TD之間，開關元件SW3的控制端耦接掃描線SL，如圖3所示，開關元件SW3可透過接觸窗C2耦接液晶電容CLC2，並耦接共用線TL。共用線TL可例如耦接源極驅動器104，以接收源極驅動器104所提供的補償信號。其中，資料線DL與液晶電容CLC1的畫素電極302間具有寄生電容Cpd，液晶電容CLC1的畫素電極302與共用線TL之間具有寄生電容Cpt(如圖4所示)。在本實施例中，開關元件SW1~SW3為以電晶體來實施，然不以此為限。 Please refer to FIG. 2, FIG. 3 and FIG. 4 at the same time. The pixel unit 108 includes a scanning line SL, a data line DL, a common line TL, switching elements SW1 to SW3 and liquid crystal capacitors CLC1 and CLC2. The switching element SW1 is coupled between the data line DL and the liquid crystal capacitor CLC1. The control terminal of the switching element SW1 is coupled to the scanning line SL. As shown in FIG. 3, the switching element SW1 is connected to the data line DL and is coupled to the liquid crystal capacitor through the contact window C1 The pixel electrode 302 of CLC1. The liquid crystal capacitor CLC1 is coupled between the switching element SW1 and the common voltage Vcom. The switching element SW2 is coupled between the data line DL and the liquid crystal capacitor CLC2. The control terminal of the switching element SW2 is coupled to the scanning line SL. As shown in FIG. 3, the switching element SW2 is connected to the data line DL and is coupled to the liquid crystal capacitor through the contact window C2 The pixel electrode of CLC2. The liquid crystal capacitor CLC2 is coupled between the switching element SW2 and the common voltage Vcom. The switching element SW3 is coupled between the pixel electrode of the liquid crystal capacitor CLC2 and the voltage V TD of the compensation signal. The control end of the switching element SW3 is coupled to the scanning line SL. As shown in FIG. 3, the switching element SW3 can be coupled through the contact window C2 Connected to the liquid crystal capacitor CLC2, and coupled to the common line TL. The common line TL may be coupled to the source driver 104, for example, to receive the compensation signal provided by the source driver 104. Among them, there is a parasitic capacitance Cpd between the data line DL and the pixel electrode 302 of the liquid crystal capacitor CLC1, and a parasitic capacitance Cpt between the pixel electrode 302 of the liquid crystal capacitor CLC1 and the common line TL (as shown in FIG. 4). In this embodiment, the switching elements SW1 to SW3 are implemented by transistors, but it is not limited thereto.

開關元件SW1~SW3可接收來自掃描線SL的掃描信號而被導通，此時資料線DL可透過導通的開關元件SW1~SW3將資料信號提供給液晶電容CLC1以及CLC2。此時，開關元件SW2以及SW3的等效電阻所構成的分壓電路可對資料信號的電壓V DL進行分壓，而在開關元件SW2以及SW3的共同接點上產生分壓，以對液晶電容CLC2施加不同於電壓V DL的電壓。如此一來，液晶電容CLC1與CLC2將會被施加不同的電壓，而可改善液晶顯示面板的色偏問題。 The switching elements SW1 ˜ SW3 can be turned on by receiving the scanning signal from the scanning line SL. At this time, the data line DL can provide the data signal to the liquid crystal capacitors CLC1 and CLC2 through the turned on switching elements SW1 ˜ SW3. At this time, the voltage divider circuit formed by the equivalent resistances of the switching elements SW2 and SW3 can divide the voltage V DL of the data signal, and a voltage divider is generated at the common contact of the switching elements SW2 and SW3 to the liquid crystal The capacitor CLC2 applies a voltage different from the voltage V DL . In this way, different voltages will be applied to the liquid crystal capacitors CLC1 and CLC2, which can improve the color shift problem of the liquid crystal display panel.

在掃描線SL停止提供掃描信號給開關元件SW1~SW3後，開關元件SW1~SW3被關閉，畫素單元108進入資料保持期間。於資料保持期間，當源極驅動器104透過資料線DL提供資料信號，對其它畫素單元進行驅動時，為避免資料信號透過寄生電容Cpd耦合至液晶電容CLC1，而影響到液晶電容CLC1的顯示內容，源極驅動器104可依據資料信號以及液晶電容CLC1儲存的影像資料的灰階值來調整補償信號的電壓V TD的電壓值，並透過寄生電容Cpt對液晶電容CLC1進行電壓補償，如此便可改善液晶電容CLC1所保持的電壓差因資料線DL與液晶電容CLC1間的耦合效應產生變化的情形，而可有效地改善垂直串音的問題，大幅提高顯示裝置的顯示品質。 After the scanning line SL stops providing scanning signals to the switching elements SW1 to SW3, the switching elements SW1 to SW3 are turned off, and the pixel unit 108 enters the data holding period. During the data retention period, when the source driver 104 provides a data signal through the data line DL to drive other pixel units, in order to avoid the data signal coupling to the liquid crystal capacitor CLC1 through the parasitic capacitance Cpd, the display content of the liquid crystal capacitor CLC1 is affected , The source driver 104 can adjust the voltage value of the compensation signal voltage V TD according to the data signal and the gray level value of the image data stored in the liquid crystal capacitor CLC1, and perform voltage compensation on the liquid crystal capacitor CLC1 through the parasitic capacitor Cpt, so that it can be improved The voltage difference held by the liquid crystal capacitor CLC1 changes due to the coupling effect between the data line DL and the liquid crystal capacitor CLC1, which can effectively improve the problem of vertical crosstalk and greatly improve the display quality of the display device.

由於在液晶電容CLC1所儲存的影像資料為低灰階時垂直串音的效應才比較明顯，因此源極驅動器104可在液晶電容CLC1所儲存的影像資料具有高灰階值時提供直流信號的補償信號，而在液晶電容CLC1所儲存的影像資料具有低灰階值時才將補償信號調整為交流信號，例如可使補償信號與資料線上的資料信號反相，以對液晶電容CLC1進行電壓補償。其中源極驅動器104可例如在液晶電容CLC1所儲存的影像資料的灰階值高於預設灰階值時將影像資料判斷為高灰階值，而在液晶電容CLC1所儲存的影像資料的灰階值未高於預設灰階值時將影像資料判斷維低灰階值。例如，若液晶電容CLC1儲存的影像資料的灰階值介於0~255之間，預設灰階值可設為96，然不以此為限。Because the effect of vertical crosstalk is more obvious when the image data stored in the liquid crystal capacitor CLC1 is low gray scale, the source driver 104 can provide DC signal compensation when the image data stored in the liquid crystal capacitor CLC1 has a high gray scale value. Signal, and the compensation signal is adjusted to an AC signal only when the image data stored in the liquid crystal capacitor CLC1 has a low gray level value, for example, the compensation signal and the data signal on the data line can be inverted to perform voltage compensation on the liquid crystal capacitor CLC1. The source driver 104 can determine the image data as a high grayscale value when the grayscale value of the image data stored in the liquid crystal capacitor CLC1 is higher than the preset grayscale value, and the grayscale of the image data stored in the liquid crystal capacitor CLC1 When the level value is not higher than the preset gray level value, the image data is judged to have a low gray level value. For example, if the gray scale value of the image data stored in the liquid crystal capacitor CLC1 is between 0 and 255, the default gray scale value can be set to 96, but it is not limited to this.

在部分實施例中，補償信號的電壓V TD可例如依據資料信號的電壓V DL以及寄生電容Cpd與寄生電容Cpt的比值來決定，例如可以下列式子來決定: V TD=(V DL-V LN)×Cpd/Cpt    (1) In some embodiments, the voltage V TD of the compensation signal may be determined according to the voltage V DL of the data signal and the ratio of the parasitic capacitance Cpd to the parasitic capacitance Cpt, for example, the following formula may be used: V TD =(V DL -V LN )×Cpd/Cpt (1)

其中V LN為液晶電容CLC1的畫素電極302上的電壓。 Where V LN is the voltage on the pixel electrode 302 of the liquid crystal capacitor CLC1.

舉例來說，圖5是依照本發明實施例的資料信號的電壓V DL、補償信號的電壓V TD以及液晶電容CLC1的畫素電極302上的電壓V LN的波形示意圖。由圖5可知，透過對共用線TL施加與資料信號的電壓V DL反相的補償信號的電壓V TD，可將受到資料線DL與液晶電容CLC1間耦合效應而被影響的電壓V LN往與資料信號的電壓V DL反相的方向拉，而可減低資料線DL與液晶電容CLC1間耦合效應對液晶電容CLC1所儲存的電壓差的影響，進而改善垂直串音的問題。 For example, FIG. 5 is a waveform diagram of the voltage V DL of the data signal, the voltage V TD of the compensation signal, and the voltage V LN on the pixel electrode 302 of the liquid crystal capacitor CLC1 according to an embodiment of the present invention. It can be seen from FIG. 5 that by applying the voltage V TD of the compensation signal inverse to the data signal voltage V DL to the common line TL, the voltage V LN affected by the coupling effect between the data line DL and the liquid crystal capacitor CLC1 can be adjusted to The voltage V DL of the data signal is pulled in the opposite direction, which can reduce the influence of the coupling effect between the data line DL and the liquid crystal capacitor CLC1 on the voltage difference stored in the liquid crystal capacitor CLC1, thereby improving the problem of vertical crosstalk.

圖6是依照本發明實施例的顯示裝置的驅動方法的流程圖，其中顯示裝置包括多個畫素單元，各個畫素單元包括第一開關元件、第二開關元件、第三開關元件、第一液晶電容以及第二液晶電容，其中第一開關元件耦接於資料線與第一液晶電容之間，第二開關元件耦接於資料線與第二液晶電容之間，第三開關元件耦接於第二液晶電容與共用線之間，資料線與第一液晶電容的畫素電極間具有第一寄生電容，第一液晶電容的畫素電極與共用線之間具有第二寄生電容。請參照圖6，由上述實施例可知，顯示裝置的驅動方法可至少包括下列步驟。首先，判斷畫素單元是否處於資料保持期間(步驟S502)。若畫素單元未處於資料保持期間，則繼續判斷畫素單元是否處於資料保持期間。若畫素單元處於資料保持期間，判斷第一液晶電容儲存的影像資料的灰階值是否小於預設灰階值(步驟S504)，其中若第一液晶電容儲存的影像資料的灰階值介於0~255之間，預設灰階值可例如設為96，然不以此為限預設灰階值。若第一液晶電容儲存的影像資料的灰階值小於預設灰階值，透過共用線提供具有交流電壓的補償信號(步驟S506)，例如提供與資料信號反相的補償信號，補償信號的電壓值可例如依據資料信號的電壓值以及第一寄生電容與第二寄生電容的比值來決定。而若第一液晶電容儲存的影像資料的灰階值未小於預設灰階值，則透過共用線提供具有直流電壓的補償信號(步驟S508)。6 is a flowchart of a driving method of a display device according to an embodiment of the present invention, wherein the display device includes a plurality of pixel units, and each pixel unit includes a first switching element, a second switching element, a third switching element, a first A liquid crystal capacitor and a second liquid crystal capacitor, wherein the first switching element is coupled between the data line and the first liquid crystal capacitor, the second switching element is coupled between the data line and the second liquid crystal capacitor, and the third switching element is coupled to Between the second liquid crystal capacitor and the common line, there is a first parasitic capacitance between the data line and the pixel electrode of the first liquid crystal capacitor, and there is a second parasitic capacitance between the pixel electrode of the first liquid crystal capacitor and the common line. Referring to FIG. 6, it can be known from the foregoing embodiment that the driving method of the display device may include at least the following steps. First, it is determined whether the pixel unit is in the data holding period (step S502). If the pixel unit is not in the data retention period, continue to determine whether the pixel unit is in the data retention period. If the pixel unit is in the data holding period, determine whether the grayscale value of the image data stored in the first liquid crystal capacitor is less than the preset grayscale value (step S504), wherein if the grayscale value of the image data stored in the first liquid crystal capacitor is between Between 0 and 255, the preset grayscale value can be set to 96, for example, but the grayscale value is not limited to this. If the gray level value of the image data stored in the first liquid crystal capacitor is less than the preset gray level value, a compensation signal having an AC voltage is provided through the common line (step S506), for example, a compensation signal inverse to the data signal is provided, and the voltage of the compensation signal The value can be determined, for example, according to the voltage value of the data signal and the ratio of the first parasitic capacitance to the second parasitic capacitance. If the gray scale value of the image data stored in the first liquid crystal capacitor is not less than the preset gray scale value, a compensation signal having a DC voltage is provided through the common line (step S508).

綜上所述，本發明的實施例在畫素單元處於資料保持期間時，依據資料信號以及第一液晶電容儲存的影像資料的灰階值調整共用線上的補償信號的電壓值，以避免液晶電容所保持的電壓差因資料線與液晶電容間的耦合效應產生變化，而可有效地改善垂直串音的問題，大幅提高顯示裝置的顯示品質。In summary, in the embodiment of the present invention, when the pixel unit is in the data holding period, the voltage value of the compensation signal on the common line is adjusted according to the data signal and the gray level value of the image data stored in the first liquid crystal capacitor to avoid the liquid crystal capacitor The maintained voltage difference changes due to the coupling effect between the data line and the liquid crystal capacitor, which can effectively improve the problem of vertical crosstalk and greatly improve the display quality of the display device.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

102:閘極驅動器102: Gate driver

104:源極驅動器104: source driver

106:顯示面板106: display panel

108:畫素單元108: Pixel unit

302:畫素電極302: pixel electrode

A-A’:剖線A-A’: Section line

SL:掃描線SL: Scan line

DL:資料線DL: data cable

TL:共用線TL: common line

SW1~SW3:開關元件SW1~SW3: switching elements

CLC1、CLC2:液晶電容CLC1, CLC2: liquid crystal capacitor

Cpd、Cpt:寄生電容Cpd, Cpt: parasitic capacitance

C1、C2:接觸窗C1, C2: contact window

Vcom:共同電壓Vcom: common voltage

VTD、VDL、VLN:電壓V TD , V DL , V LN : voltage

S502~S508:顯示裝置的驅動方法S502~S508: Driving method of display device

圖1是依照本發明實施例的一種顯示裝置的示意圖。 圖2是依照本發明實施例的一種畫素單元的示意圖。 圖3是依照本發明實施例的一種畫素單元的佈局示意圖。 圖4則為本發明實施例之畫素單元的剖面示意圖。 圖5是依照本發明實施例的資料信號的電壓、補償信號的電壓以及畫素電極的電壓的波形示意圖。 圖6是依照本發明實施例的顯示裝置的驅動方法的流程圖。 FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a pixel unit according to an embodiment of the invention. FIG. 3 is a schematic layout diagram of a pixel unit according to an embodiment of the invention. 4 is a schematic cross-sectional view of a pixel unit according to an embodiment of the invention. FIG. 5 is a schematic diagram of waveforms of a voltage of a data signal, a voltage of a compensation signal, and a voltage of a pixel electrode according to an embodiment of the invention. 6 is a flowchart of a driving method of a display device according to an embodiment of the present invention.

108:畫素單元 108: Pixel unit

SL:掃描線 SL: Scan line

DL:資料線 DL: data cable

SW1~SW3:開關元件 SW1~SW3: switching elements

CLC1、CLC2:液晶電容 CLC1, CLC2: liquid crystal capacitor

Vcom:共同電壓 Vcom: common voltage

VTD、VDL、VLN:電壓 V TD , V DL , V LN : voltage

Cpd、Cpt:寄生電容 Cpd, Cpt: parasitic capacitance

Claims (9)

一種顯示裝置，包括：一閘極驅動器；一源極驅動器；以及多個畫素單元，其中各該畫素單元包括：一掃描線，耦接該閘極驅動器；一資料線，耦接該源極驅動器，接收該源極驅動器提供的一資料信號；一共用線，耦接該源極驅動器，接收該源極驅動器提供的一補償信號；一第一開關元件，其第一端耦接該資料線，該第一開關元件的控制端耦接該掃描線；一第一液晶電容，耦接於該第一開關元件的第二端與一共同電壓之間，其中該資料線與該第一液晶電容的畫素電極間具有一第一寄生電容，該第一液晶電容的畫素電極與該共用線之間具有一第二寄生電容；一第二開關元件，其第一端耦接該資料線，該第二開關元件的控制端耦接該掃描線；一第二液晶電容，耦接於該第二開關元件的第二端與該共同電壓之間；以及一第三開關元件，其第一端耦接該第二開關元件的第二端，該第三開關元件的控制端耦接至該掃描線，該第三開關元件 的第二端耦接該源極驅動器以接收該補償信號，於各該畫素單元的資料保持期間，該源極驅動器依據該資料信號與該第一液晶電容儲存的影像資料的灰階值調整該補償信號的電壓值。 A display device includes: a gate driver; a source driver; and a plurality of pixel units, wherein each pixel unit includes: a scanning line coupled to the gate driver; a data line coupled to the source A source driver receives a data signal provided by the source driver; a common line is coupled to the source driver and receives a compensation signal provided by the source driver; a first switching element whose first end is coupled to the data Line, the control end of the first switching element is coupled to the scanning line; a first liquid crystal capacitor is coupled between the second end of the first switching element and a common voltage, wherein the data line and the first liquid crystal There is a first parasitic capacitance between the pixel electrodes of the capacitor, a second parasitic capacitance between the pixel electrode of the first liquid crystal capacitor and the common line; a second switching element, the first end of which is coupled to the data line , The control end of the second switching element is coupled to the scanning line; a second liquid crystal capacitor is coupled between the second end of the second switching element and the common voltage; and a third switching element, the first The terminal is coupled to the second terminal of the second switching element, the control terminal of the third switching element is coupled to the scanning line, and the third switching element The second end of the source driver is coupled to the source driver to receive the compensation signal. During the data retention period of each pixel unit, the source driver adjusts the gray scale value of the image data stored by the data signal and the first liquid crystal capacitor The voltage value of the compensation signal. 如申請專利範圍第1項所述的顯示裝置，其中於各該畫素單元的資料保持期間，當該第一液晶電容儲存的影像資料的灰階值低於一預設灰階值時，該源極驅動器將該補償信號調整為交流信號，當該第一液晶電容儲存的影像資料的灰階值未低於該預設灰階值時，該補償信號為直流信號。 The display device according to item 1 of the patent application scope, wherein during the data retention period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than a preset gray level value, the The source driver adjusts the compensation signal to an AC signal. When the gray scale value of the image data stored in the first liquid crystal capacitor is not lower than the preset gray scale value, the compensation signal is a DC signal. 如申請專利範圍第1項所述的顯示裝置，其中於各該畫素單元的資料保持期間，當該第一液晶電容儲存的影像資料的灰階值低於一預設灰階值時，該補償信號與該資料信號反相。 The display device according to item 1 of the patent application scope, wherein during the data retention period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than a preset gray level value, the The compensation signal is inverted from the data signal. 如申請專利範圍第1項所述的顯示裝置，其中於各該畫素單元的資料保持期間，當該第一液晶電容儲存的影像資料的灰階值低於一預設灰階值時，該補償信號的電壓值關聯於該資料信號的電壓值以及該第一寄生電容與該第二寄生電容的比值。 The display device according to item 1 of the patent application scope, wherein during the data retention period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than a preset gray level value, the The voltage value of the compensation signal is related to the voltage value of the data signal and the ratio of the first parasitic capacitance to the second parasitic capacitance. 如申請專利範圍第4項所述的顯示裝置，其中該第一液晶電容儲存的影像資料的灰階值介於0~255之間，該預設灰階值為96。 The display device as described in item 4 of the patent application range, wherein the gray scale value of the image data stored in the first liquid crystal capacitor is between 0 and 255, and the preset gray scale value is 96. 一種顯示裝置的驅動方法，該顯示裝置包括多個畫素單元，各該畫素單元包括一第一開關元件、一第二開關元件、一第三開關元件、一第一液晶電容以及一第二液晶電容，其中該第一開關元件耦接於一資料線與該第一液晶電容之間，該第二開關元 件耦接於該資料線與該第二液晶電容之間，該第三開關元件耦接於該第二液晶電容與一共用線之間，該資料線與該第一液晶電容的畫素電極間具有一第一寄生電容，該第一液晶電容的畫素電極與該共用線之間具有一第二寄生電容，該顯示裝置的驅動方法包括：判斷一畫素單元是否處於資料保持期間；若該畫素單元處於資料保持期間，判斷該第一液晶電容儲存的影像資料的灰階值是否小於一預設灰階值；若該第一液晶電容儲存的影像資料的灰階值小於該預設灰階值，透過該共用線提供具有交流電壓的補償信號；以及若該第一液晶電容儲存的影像資料的灰階值未小於該預設灰階值，透過該共用線提供具有直流電壓的補償信號。 A driving method of a display device, the display device includes a plurality of pixel units, each of which includes a first switching element, a second switching element, a third switching element, a first liquid crystal capacitor and a second Liquid crystal capacitor, wherein the first switch element is coupled between a data line and the first liquid crystal capacitor, and the second switch element Device is coupled between the data line and the second liquid crystal capacitor, the third switching element is coupled between the second liquid crystal capacitor and a common line, the data line and the pixel electrode of the first liquid crystal capacitor It has a first parasitic capacitance and a second parasitic capacitance between the pixel electrode of the first liquid crystal capacitor and the common line. The driving method of the display device includes: judging whether a pixel unit is in the data holding period; During the data holding period of the pixel unit, it is determined whether the gray scale value of the image data stored in the first liquid crystal capacitor is less than a preset gray scale value; if the gray scale value of the image data stored in the first liquid crystal capacitor is less than the preset gray scale Level value, providing a compensation signal with an AC voltage through the common line; and if the gray level value of the image data stored in the first liquid crystal capacitor is not less than the preset gray level value, providing the compensation signal with a DC voltage through the common line . 如申請專利範圍第6項所述的顯示裝置的驅動方法，其中於該畫素單元的資料保持期間，當該第一液晶電容儲存的影像資料的灰階值低於該預設灰階值時，該補償信號與該資料信號反相。 The driving method of the display device as described in item 6 of the patent application range, wherein during the data holding period of the pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than the preset gray level value , The compensation signal is inverse to the data signal. 如申請專利範圍第6項所述的顯示裝置的驅動方法，其中於各該畫素單元的資料保持期間，當該第一液晶電容儲存的影像資料的灰階值低於該預設灰階值時，該補償信號的電壓值關聯於該資料信號的電壓值以及該第一寄生電容與該第二寄生電容的比值。 The driving method of the display device as described in item 6 of the patent application range, wherein during the data holding period of each pixel unit, when the gray level value of the image data stored in the first liquid crystal capacitor is lower than the preset gray level value At this time, the voltage value of the compensation signal is related to the voltage value of the data signal and the ratio of the first parasitic capacitance to the second parasitic capacitance. 如申請專利範圍第6項所述的顯示裝置的驅動方法，其中該第一液晶電容儲存的影像資料的灰階值介於0~255之間，該預設灰階值為96。 The driving method of a display device as described in item 6 of the patent application range, wherein the gray scale value of the image data stored in the first liquid crystal capacitor is between 0 and 255, and the preset gray scale value is 96.
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