WO2013071580A1 - 液晶面板的驱动方法 - Google Patents

液晶面板的驱动方法 Download PDF

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Publication number
WO2013071580A1
WO2013071580A1 PCT/CN2011/082746 CN2011082746W WO2013071580A1 WO 2013071580 A1 WO2013071580 A1 WO 2013071580A1 CN 2011082746 W CN2011082746 W CN 2011082746W WO 2013071580 A1 WO2013071580 A1 WO 2013071580A1
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Prior art keywords
voltage
scan
pixel
liquid crystal
film transistor
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English (en)
French (fr)
Inventor
侯鸿龙
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/379,902 priority Critical patent/US8842063B2/en
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/067—Special waveforms for scanning, where no circuit details of the gate driver are given
    • 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

Definitions

  • the present invention relates to a driving method, and in particular to a driving method of a liquid crystal panel, which improves the color temperature drift by adjusting an amplitude waveform of a scanning signal of a gate, and solves a color filter integrated transistor substrate (color) Filter on array, COA) The color shift caused by the difference in reaction time of RGB three primary colors in the liquid crystal panel.
  • liquid crystal display liquid crystal display, LCD
  • LCD liquid crystal display
  • cathode ray tube, CRT cathode ray tube
  • FIG. 1 a schematic diagram of a relationship between a scan signal and a data signal in a prior art liquid crystal panel driving method is shown.
  • the operation principle of the liquid crystal panel is that the scan signal 100 of the gate sequentially writes (records) the data signal 102 on the data line to the liquid crystal pixels to generate various signals.
  • the scan signal 100 is sequentially sent from the top to the bottom of the screen, wherein the waveform height (Vgh) and the waveform width (GPW) of the scan signal 100 are the same during the transmission, that is, the waveform height (Vgh).
  • the voltage level indicated (voltage Level) remains unchanged, and the length of time represented by the waveform width (GPW) does not change.
  • the color filter layers of red (R), green (G), and blue (B) are set for each pixel, and the three colors of red (R), green (G), and blue (B). It is called sub-pixel.
  • Prior art color tracking of liquid crystal displays also known as color temperature detection, when the color temperature is high, the white is blue, and when the color temperature is low, the white is yellow. The reason is that red (R), green (G), and blue (B) are out of tune, that is, the RGB three primary colors cannot generate a predetermined color mixing ratio according to the input data signal. In other words, the voltage and transmittance curves of the three primary colors of RGB (voltage-transmittance) The curve is different.
  • the same gray level will give the same voltage, causing the ratio of RGB three primary colors to change at different gray levels (voltage), that is, the color temperature will drift.
  • the current solution is based on the process, so that RGB has different cell heights, changing the original voltage and transmittance curve to compensate for the different voltage and transmittance curves of the three primary colors of RGB.
  • the process will be shifted, and it is difficult to improve the above-mentioned color temperature variation.
  • the material characteristics of the color resist layer of the color filter are different, that is, the dielectric constants of the RGB three primary colors are different, so that between the gate and the pixel electrode (Cgs)
  • the parasitic capacitance is different, so that the feedthrough of RGB three primary colors (feed-through)
  • the voltage, VFT) is different, resulting in the same grayscale voltage.
  • the reaction time of RGB three colors is different, resulting in color shift.
  • An object of the present invention is to provide a driving method of a liquid crystal panel to solve the problem of color temperature drift, and to solve the problem of color shift caused by different dynamic reaction speeds of RGB three primary colors in a liquid crystal panel integrated with a color filter integrated transistor substrate (COA). .
  • COA color filter integrated transistor substrate
  • the present invention provides a driving method of a liquid crystal panel, in which a plurality of scanning lines and a plurality of data lines are interlaced to form a plurality of sub-pixel regions, the plurality of scanning lines including a first scanning line and a second scanning line, and the sub-pixel area includes a first pixel region and a second pixel region, the first pixel region including a first thin film transistor, a first pixel electrode, and a shared electrode, wherein the second pixel region includes a second thin film transistor and a second pixel electrode And the shared electrode, the first thin film transistor includes a first gate connected to the first scan line, a first source connected to the first pixel electrode, and a first drain connected to a data line.
  • the second thin film transistor includes a second gate connected to the second scan line, a second source connected to the second pixel electrode, and a second drain connected to the data line, the first pixel electrode and The second pixel electrode and the shared electrode form a first liquid crystal capacitor and a second liquid crystal capacitor, respectively, wherein the driving method comprises the following steps:
  • the plurality of scan lines further includes a third scan line
  • the sub-pixel region further includes a third pixel region, where the third pixel region includes a third thin film transistor, a third pixel electrode, and a
  • the third thin film transistor includes a third gate connected to the third scan line, a third source connected to the third pixel electrode, and a third drain connected to the data line
  • the third The pixel electrode and the shared electrode form a third liquid crystal capacitor, and after the step (d), the method further comprises the following steps:
  • first feedthrough voltage, the second feedthrough voltage, and the third feedthrough voltage are individually represented as the following equation:
  • ⁇ V1 Cgs1 * Vpp1/ (Clc1+Cst+Cgs1);
  • ⁇ V2 Cgs2 * Vpp2/ (Clc2+Cst+Cgs2);
  • ⁇ V3 Cgs3 * Vpp3/ (Clc3+Cst+Cgs3);
  • ⁇ V1, ⁇ V2, ⁇ V3 are the first feedthrough voltage, the second feedthrough voltage, and the third feedthrough voltage, respectively, and Cgs1, Cgs2, and Cgs3 are individually between the first gate and the first source a first capacitance value, a second capacitance value between the second gate and the second source, and a third capacitance value between the third gate and the third source, Vpp1 And Vpp2 and Vpp3 are respectively the first scan voltage, the second scan voltage, and the third scan voltage, and Clc1, Clc2, and Clc3 are the first liquid crystal capacitor, the second liquid crystal capacitor, and the third liquid crystal capacitor, respectively, and Cst is The storage capacitor of the secondary pixel area.
  • the voltage of the first drain is greater than the voltage of the second drain, and the voltage of the second drain is greater than the voltage of the third drain.
  • the first pixel region, the second pixel region, and the third pixel region are red sub-pixels, green sub-pixels, and blue sub-pixels, respectively.
  • the driving method of the liquid crystal panel of the invention can solve the problem of color temperature drift and solve the problem of color shift caused by different dynamic reaction speeds of three primary colors of RGB in the liquid crystal panel.
  • FIG. 1 is a schematic diagram showing the relationship between a scanning signal and a data signal in a prior art liquid crystal panel driving method.
  • FIG. 2 is a schematic diagram showing the circuit structure of a liquid crystal panel according to an embodiment of the present invention.
  • FIG. 3 is a flow chart showing the steps of a driving method of the liquid crystal panel 200 according to an embodiment of the present invention.
  • FIG. 4A is a circuit layout diagram of a sub-pixel area of a liquid crystal panel according to a first embodiment of the present invention.
  • Figure 4B is a schematic cross-sectional view along line A-A' of Figure 4A in accordance with the present invention.
  • Fig. 5 is a view showing a waveform after adjusting a signal waveform in a driving method of three sub-pixel regions in the first embodiment of the present invention.
  • Figure 6 is a diagram showing the relationship between the voltage and the transmittance of the three sub-pixel regions in the second embodiment according to the present invention.
  • the liquid crystal panel 200 includes a scan driving circuit 202g, a data driving circuit 202s, a plurality of scanning lines SL1, a plurality of data lines DL1, and a pixel unit 204.
  • the scan driving circuit 202g is connected to the scan line SL1, and the data driving circuit 202s is connected to the data line DL1.
  • the scan line SL1 and the data line DL1 are insulated from each other by a plurality of pixel units 204, and each pixel unit 204 is multi-pixel unit 204.
  • the scan driving circuit 202g supplies a scan voltage to the pixel unit 204, and the data driving circuit 202s determines whether to provide the data voltage to each sub-pixel area of the pixel unit 204 depending on whether the scan voltage is turned on.
  • the plurality of scan lines SL1 and the plurality of data lines DL1 are interdigitated to form a plurality of sub-pixel regions, the plurality of scan lines SL1 including a first scan line SL1R, a second scan line SL1G, and a third scan line SL1B, wherein the sub-pixel area includes The first pixel region 204g, the second pixel region 204r, and the third pixel region 204b, the first pixel region 204g includes a first thin film transistor 206a, a first pixel electrode 208a, a shared electrode (Vcom) 210, and a memory Capacitor Cst, the second pixel region 204r includes a second thin film transistor 206b, a second pixel electrode 208b, a shared power 210, and a storage capacitor Cst, and the third pixel region 204b includes a third thin film transistor 206c and a third pixel.
  • the first thin film transistor 206a includes a first gate 206g1 connected to the first scan line SL1G, a first source 206s1 connected to the first pixel electrode 208a, and a first drain 206d1 connected to a data line DL1.
  • the second thin film transistor 206b includes a second gate 206g2 connected to the second scan line SL1R, a second source 206s2 connected to the second pixel electrode 208b, and a second drain 206d2 connected to the data line DL1.
  • the third thin film transistor 206c includes a third gate 206g3 connected to the third scan line SL1B, a third source 206s3 connected to the third pixel electrode 208c, and a third drain 206d3 connected to the data line.
  • the first pixel electrode 208a, the second pixel electrode 208b, and the third pixel electrode 208c form a first liquid crystal capacitor 212a, a second liquid crystal capacitor 212b, and a third liquid crystal capacitor 212c, respectively, and the shared electrode 210.
  • the first thin film transistor 206a connected to the first scan line SL1R, the second scan line SL1G, and the third scan line SL1B
  • the second thin film transistor 206b and the third thin film transistor 206c are turned on so that the data (voltage level) carried on the data line DL1 can be written into the sub-pixel first pixel electrode 208a, the second pixel electrode 208b, and the third.
  • the pixel electrode 208c When the first scan line SL1R, the second scan line SL1G, and the third scan line SL1B provide a sufficient turn-on voltage, the first thin film transistor 206a connected to the first scan line SL1R, the second scan line SL1G, and the third scan line SL1B
  • the second thin film transistor 206b and the third thin film transistor 206c are turned on so that the data (voltage level) carried on the data line DL1 can be written into the sub-pixel first pixel electrode 208a, the second pixel electrode 208b, and the
  • the first thin film transistor 206a, the second thin film transistor 206b, and the third thin film transistor 206c are turned off, and the pixels 208a are held by the liquid crystal capacitor Clc and the storage capacitor Cst. 208b, 208c
  • the voltage level of the pixel electrode is easily changed by the influence of other ambient voltage changes. This voltage variation is called the feedthrough voltage (VFT).
  • the rotation angle of the liquid crystal molecules is changed by the magnitude of the electric field applied to the liquid crystal molecules, thereby exhibiting various gray scale changes. Since the magnitude of the electric field applied to the liquid crystal molecules is the pixel electrode and the common electrode of each pixel (common) The voltage difference of the electrode is determined, so that the dynamic level of the liquid crystal molecules can be adjusted when the voltage level of the pixel of the sub-pixel is affected by the feed-through voltage (VFT).
  • VFT feed-through voltage
  • the first pixel region 208a, the second pixel region 208b, and the third pixel region 208c are red sub-pixels, green sub-pixels, and blue sub-pixels, respectively.
  • the driving method includes the following steps:
  • step S300 a first scan voltage is applied to the first scan line SL1R to turn on the first thin film transistor 206a, and a data voltage passing through the data line DL1 is transmitted to the first source 206s1 via the first drain 206d1.
  • the first liquid crystal capacitor 212a is charged to a first pixel voltage.
  • step S302 the first scan voltage is unloaded to turn off the first thin film transistor 206a, and the first pixel voltage of the first pixel electrode 208a is lowered by a first feedthrough voltage.
  • step S304 a second scan voltage is applied to the second scan line SL1G to turn on the second thin film transistor 206b, and the data voltage passing through the data line DL1 is transmitted through the second drain 206d2 and the second source 206s2.
  • step S304 Up to the second pixel electrode 208b, charging the second liquid crystal capacitor 212b to a second pixel voltage, wherein the first scan voltage is not equal to the second scan voltage.
  • step S306 the second scan voltage is unloaded to turn off the second thin film transistor 206b, and the second pixel voltage of the second pixel electrode 208b is decreased by a second feedthrough voltage, wherein the first The scan voltage and the second scan voltage are individually proportional to the first feedthrough voltage and the second feedthrough voltage.
  • step S308 a third scan voltage is applied to the third scan line SL1B to turn on the third thin film transistor 206c, and the data voltage through the data line DL1 is transmitted through the third drain 206d3 and the third source 206s3.
  • step S308 Up to the third pixel electrode 208c, charging the third liquid crystal capacitor 212c to a third pixel voltage, wherein the first scan voltage, the second scan voltage, and the third scan voltage are not equal.
  • step S310 the third scan voltage is unloaded to turn off the third thin film transistor 206c, and the third pixel voltage of the third pixel electrode 208c is decreased by a third feedthrough voltage, wherein the third The scan voltage is proportional to the third feedthrough voltage.
  • the first feedthrough voltage, the second feedthrough voltage, and the third feedthrough voltage are individually expressed as the following equation:
  • ⁇ V1 Cgs1 * Vpp1/ (Clc1+Cst+Cgs1) ............ (E1);
  • ⁇ V2 Cgs2 * Vpp2/ (Clc2+Cst+Cgs2) ............ (E2);
  • ⁇ V3 Cgs3 * Vpp3/ (Clc3+Cst+Cgs3) ............ (E3);
  • ⁇ V1, ⁇ V2, ⁇ V3 are the first feedthrough voltage, the second feedthrough voltage, and the third feedthrough voltage.
  • Cgs1, Cgs2, and Cgs3 are respectively a first capacitance value between the first gate and the first source, a second capacitance value between the second gate and the second source, and a third capacitance value between the third gate and the third source.
  • Vpp1, Vpp2, and Vpp3 are the first scan voltage, the second scan voltage, and the third scan voltage, that is, the scan line on/off thin film transistor 208a. 208b, The voltage difference of 208c.
  • Clc1, Clc2, and Clc3 are the first liquid crystal capacitor 212a, the second liquid crystal capacitor 212b, and the third liquid crystal capacitor 212c.
  • Cst is the storage capacitor of the sub-pixel area.
  • FIG. 4A is a schematic diagram showing the circuit layout of a sub-pixel area of the liquid crystal panel according to the first embodiment of the present invention
  • FIG. 4B is a cross-sectional view of the line A-A' in FIG. 4A of the present invention.
  • the first pixel area 204g includes the first thin film transistor 206a and the first pixel.
  • the electrode 208a and the shared electrode 210 wherein the gate insulating layer 214 and the color resist layer 216 are disposed between the first gate 206g1 and the first pixel electrode 208a, and the color resist layer 216a forms a first capacitance value Cgs1.
  • a gate insulating layer 214 and a color resist layer (not shown) are disposed between the second gate 206g2 and the second pixel electrode 208b, and the color resist layer forms a second Capacitance value Cgs2.
  • Cgs is proportional to ⁇ * A / d, where ⁇ is the dielectric constant of the color resist layer, A is the overlap area of the pixel electrode and the gate, and d is the distance between the pixel electrode and the gate.
  • FIG. 5 it is a waveform diagram after adjusting a signal waveform in a driving method of three sub-pixel regions in the first embodiment of the present invention.
  • the horizontal axis is time and the vertical axis is signal amplitude, including the scan signal VG, the drain signal VD, the source signal VS, and the shared electrode signal Vcom.
  • the scan voltage can be used to adjust the feed current to make it consistent, thereby changing the pressure of the pixel electrode of each pixel region to the same level, so that the liquid crystal molecules of each pixel region are under the same gray scale voltage, and the three primary colors react. The same time, to solve the color shift phenomenon of the liquid crystal dynamic rotation.
  • FIG. 6 there is shown a corresponding relationship between voltage and transmittance of three sub-pixel regions in the second embodiment of the present invention.
  • the horizontal axis is the voltage
  • the vertical axis is the transmittance
  • R is the red sub-pixel area (the first pixel area)
  • G is the green sub-pixel area (the second pixel area)
  • B is the blue sub-pixel area (third)
  • the sub-pixel region for example, when a predetermined data voltage V1 is applied in the red sub-pixel region, the green sub-pixel region, and the blue sub-pixel region, respectively, corresponding to the different first transmittance T1, second transmittance T2, and Three penetration rate T3.
  • the present invention utilizes scanning.
  • the voltage is used to correct the feedthrough voltage to achieve the purpose of modifying the predetermined data voltage, and the problem of color temperature drift can be solved.
  • the voltages are (V1 + ⁇ V1), V1, V1 - ⁇ V1, respectively, to solve the problem of color temperature drift.
  • the driving method of the liquid crystal panel of the present invention can solve the problem of color temperature drift and solve the problem of color shift caused by different dynamic reaction speeds of RGB three primary colors in the liquid crystal panel of the color filter integrated transistor substrate (COA).

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Abstract

一种液晶面板的驱动方法包括下列步骤：（a）施加第一扫描电压以开启第一薄膜晶体管，通过数据线的数据电压传送至第一画素电极；（b）卸载第一扫描电压以关闭第一薄膜晶体管，使第一画素电极的第一画素电压下降一第一馈通电压；（c）施加第二扫描电压以开启第二薄膜晶体管，通过数据线的数据电压传送至第二画素电极，其中第一扫描电压与第二扫描电压不相等；以及（d）卸载第二扫描电压以关闭第二薄膜晶体管，使第二画素电极的第二画素电压下降一第二馈通电压，其中第一扫描电压与第二扫描电压分别与第一馈通电压与第二馈通电压形成正比例相关。

Description

液晶面板的驱动方法 技术领域
本发明涉及一种驱动方法，且特别是涉及一种液晶面板的驱动方法，通过调整栅极的扫描信号的振幅波形，以改善色温漂移的问题，并且解决彩色滤光片整合晶体管基板(color filter on array, COA)的液晶面板中RGB三原色的反应时间不同所造成的颜色偏移问题。
 背景技术
由于液晶显示器(liquid crystal display, LCD)具有低辐射、体积小及低耗能等优点，因此逐渐取代传统的阴极射线管(cathode ray tube, CRT)显示器，广泛地应用在笔记型计算机、个人数字助理(personal digital assistant, PDA)、平面电视，或行动电话等信息产品上。
参考图1，其绘示现有技术的液晶面板驱动方法中扫描信号与数据信号的关系示意图。液晶面板的操作原理是将栅极的扫描信号100将数据线上的数据讯号102依序写入(记录)至液晶画素中，以产生各种不同讯号。现有技术中，扫描信号100是由画面的上方至下方依序送出，其中扫描信号100的波形高度(Vgh)以及波形宽度(GPW)在传送过程中均维持相同，亦即波形高度(Vgh)所表示的电压位准(voltage level)维持不变，波形宽度(GPW)所代表的时间(time)长度不变。
每个画素的位置都会设置红色(R)、绿色(G)以及蓝色(B)的彩色滤光层，而相对红色(R)、绿色(G)以及蓝色(B)三种颜色的画素称为次画素(sub-pixel)。现有技术会对液晶显示器进行色彩追踪(color tracking)，亦即作色温检测，当色温高时白色偏蓝，色温低时白色偏黄。其原因为红色(R)、绿色(G)以及蓝色(B)失调，亦即RGB三原色无法依据输入的数据信号产生预定的混色比例。换言之，RGB三原色的电压与穿透率曲线(voltage-transmittance curve)不相同，导致液晶面板操作时，同一灰阶会给相同电压，造成在不同灰阶(电压)时，RGB三原色的比例不断变化，也就是色温会漂移(drift)。目前解决的方式是以制程方式，使RGB有不同的液晶盒高度，改变原有电压与穿透率曲线，以补偿RGB三原色不同的电压与穿透率特性曲线。但是其制程会偏移，不易改善上述色温变动的问题。
另外，在彩色滤光片整合晶体管基板(COA)中，由于彩色滤光片的色阻层的材料特性不同，亦即RGB三原色的介电常数不同，使得栅极与画素电极(Cgs)之间的寄生电容不相同，使得RGB三原色的馈通电压(feed-through voltage, VFT)不同，造成同样的灰阶电压，RGB三色的反应时间却不相同，导致颜色偏移。
因此需要发展一种新式的液晶面板的驱动方法，以解决上述色温变动以及RGB三原色动态反应速度不一致的问题。
 技术问题
本发明的目的在于提供一种液晶面板的驱动方法，以解决色温漂移的问题，以及解决彩色滤光片整合晶体管基板(COA)的液晶面板中RGB三原色的动态反应速度不同造成颜色偏移的问题。
 技术解决方案
本发明提供一种液晶面板的驱动方法，若干扫描线以及若干数据线互相交错，以形成若干次画素区，所述若干扫描线包括第一扫描线与第二扫描线，所述次画素区包括第一次画素区以及第二次画素区，所述第一次画素区包括第一薄膜晶体管、第一画素电极以及共享电极，所述第二次画素区包括第二薄膜晶体管、第二画素电极以及所述共享电极，所述第一薄膜晶体管包括连接所述第一扫描线之第一栅极、连接所述第一画素电极之第一源极以及连接一数据线之第一汲极，所述第二薄膜晶体管包括连接所述第二扫描线之第二栅极、连接所述第二画素电极之第二源极以及连接所述数据线之第二汲极，所述第一画素电极以及所述第二画素电极个别与所述共享电极形成第一液晶电容以及第二液晶电容，其特征在于，所述驱动方法包括下列步骤：
(a) 施加第一扫描电压至所述第一扫描线以开启所述第一薄膜晶体管，通过所述数据线的数据电压经由第一汲极与第一源极传送至所述第一画素电极，使所述第一液晶电容充电至第一画素电压；
(b) 卸载所述第一扫描电压以关闭所述第一薄膜晶体管，使所述第一画素电极的所述第一画素电压下降一第一馈通电压；
(c) 施加第二扫描电压至所述第二扫描线以开启所述第二薄膜晶体管，通过所述数据线的数据电压经由第二汲极与第二源极传送至所述第二画素电极，使所述第二液晶电容充电至第二画素电压，其中所述第一扫描电压与第二扫描电压不相等；以及
(d) 卸载所述第二扫描电压以关闭所述第二薄膜晶体管，使所述第二画素电极的所述第二画素电压下降一第二馈通电压，其中所述第一扫描电压与第二扫描电压个别与所述第一馈通电压与所述第二馈通电压形成正比例相关。
在一实施例中，所述若干扫描线还包括第三扫描线，所述次画素区还包括第三次画素区，所述第三次画素区包括第三薄膜晶体管、第三画素电极以及所述共享电极，所述第三薄膜晶体管包括连接第三扫描线之第三栅极、连接所述第三画素电极之第三源极以及连接所述数据线之第三汲极，所述第三画素电极与所述共享电极形成第三液晶电容，其特征在于，在步骤(d)之后，还包括下列步骤：
(e) 施加第三扫描电压至所述第三扫描线以开启所述第三薄膜晶体管，通过所述数据线的数据电压经由第三汲极与第三源极传送至所述第三画素电极，使所述第三液晶电容充电至第三画素电压，其中所述第一扫描电压、第二扫描电压以及第三扫描电压不相等；以及
(f) 卸载所述第三扫描电压以关闭所述第三薄膜晶体管，使所述第三画素电极的所述第三画素电压下降一第三馈通电压，其中所述第三扫描电压与所述第三馈通电压形成正比例相关。
在一实施例中，其中所述第一馈通电压、所述第二馈通电压以及所述第三馈通电压个别表示为下列方程式：
ΔV1 = Cgs1 * Vpp1/ (Clc1+Cst+Cgs1)；
ΔV2 = Cgs2 * Vpp2/ (Clc2+Cst+Cgs2)；及
ΔV3 = Cgs3 * Vpp3/ (Clc3+Cst+Cgs3)；
其中ΔV1、ΔV2、ΔV3个别为所述第一馈通电压、第二馈通电压以及第三馈通电压，Cgs1、Cgs2、Cgs3个别为所述第一栅极与所述第一源极之间的第一电容值、所述第二栅极与所述第二源极之间的第二电容值、以及所述第三栅极与所述第三源极之间的第三电容值，Vpp1、Vpp2、Vpp3个别为所述第一扫描电压、第二扫描电压以及第三扫描电压，Clc1、Clc2、Clc3个别为所述第一液晶电容、第二液晶电容以及第三液晶电容，Cst为所述次画素区的存储电容。
在一实施例中，当Cgs1 > Cgs2 > Cgs3时，调整所述第一扫描电压、第二扫描电压及/或第三扫描电压，使Vpp1 < Vpp2 < Vpp3，并且使ΔV1 = ΔV2 = ΔV3。
在一实施例中，所述第一汲极的电压大于所述第二汲极的电压，所述第二汲极的电压大于所述第三汲极的电压。
在一实施例中，当Cgs1 = Cgs2 = Cgs3时，并且若是同时施加于所述第一次画素区、第二次画素区以及第三次画素区的一预定数据电压时，分别对应不相同的第一穿透率、第二穿透率以及第三穿透率，则调整所述第一扫描电压、第二扫描电压及/或第三扫描电压，通过Vpp1 > Vpp2 > Vpp3，使ΔV1 > ΔV2 > ΔV3。
在一实施例中，所述第一次画素区、所述第二次画素区以及所述第三次画素区分别为红色次画素、绿色次画素以及蓝色次画素。
 有益效果
本发明的液晶面板的驱动方法，可解决色温漂移的问题，以及解决液晶面板中RGB三原色的动态反应速度不同造成颜色偏移的问题。
 附图说明
图1:为现有技术的液晶面板驱动方法中扫描信号与数据信号的关系示意图。
图2:为根据本发明实施例中液晶面板的电路架构示意图。
图3:为根据本发明实施例中液晶面板200的驱动方法的步骤流程图。
图4A:为根据本发明第一实施例中液晶面板的一个次画素区的电路布局示意图。
图4B为根据本发明图4A中沿着A-A’线段的剖面示意图。
图5:为根据本发明第一实施例中三个次画素区的驱动方法中调整信号波形之后的波形示意图。
图6:为根据本发明第二实施例中三个次画素区的电压与穿透率的相对应关系图。
 本发明的最佳实施方式
本发明说明书提供不同的实施例来说明本发明不同实施方式的技术特征。实施例中的各组件的配置是为了清楚说明本发明揭示的内容，并非用以限制本发明。在不同的图式中，相同的组件符号表示相同或相似的组件。
参考图2，其为本发明实施例中液晶面板200的电路架构示意图。液晶面板200包括扫描驱动电路202g、数据驱动电路202s、若干扫描线SL1、若干数据线DL1以及画素单元204。扫描驱动电路202g连接所述扫描线SL1，数据驱动电路202s连接所述数据线DL1，所述扫描线SL1与所述数据线DL1互相绝缘交错行程多个画素单元204，每个画素单元204由多个次画素区组成。扫描驱动电路202g提供扫描电压至画素单元204，数据驱动电路202s依据扫描电压是否开启，以决定提供数据电压至画素单元204的每个次画素区。
若干扫描线SL1以及若干数据线DL1互相交错，以形成若干次画素区，所述若干扫描线SL1包括第一扫描线SL1R、第二扫描线SL1G以及第三扫描线SL1B，所述次画素区包括第一次画素区204g、第二次画素区204r以及第三次画素区204b，所述第一次画素区204g包括第一薄膜晶体管206a、第一画素电极208a、共享电极(Vcom)210以及存储电容Cst，所述第二次画素区204r包括第二薄膜晶体管206b、第二画素电极208b、共享电210以及存储电容Cst，所述第三次画素区204b包括第三薄膜晶体管206c、第三画素电极208c、共享电极210以及存储电容Cst。
所述第一薄膜晶体管206a包括连接所述第一扫描线SL1G之第一栅极206g1、连接所述第一画素电极208a之第一源极206s1以及连接一数据线DL1之第一汲极206d1，所述第二薄膜晶体管206b包括连接所述第二扫描线SL1R之第二栅极206g2、连接所述第二画素电极208b之第二源极206s2以及连接所述数据线DL1之第二汲极206d2，所述第三薄膜晶体管206c包括连接第三扫描线SL1B之第三栅极206g3、连接所述第三画素电极208c之第三源极206s3以及连接所述数据线之第三汲极206d3。所述第一画素电极208a、所述第二画素电极208b以及所述第三画素电极208c个别与所述共享电极210形成第一液晶电容212a、第二液晶电容212b以及第三液晶电容212c。
当第一扫描线SL1R、第二扫描线SL1G以及第三扫描线SL1B提供足够的开启电压时，连接至第一扫描线SL1R、第二扫描线SL1G以及第三扫描线SL1B的第一薄膜晶体管206a、第二薄膜晶体管206b以及第三薄膜晶体管206c就会被打开，以使资料线DL1所搭载的数据(电压位准)能够写入次画素第一画素电极208a、第二画素电极208b以及第三画素电极208c。
当上述写入动作完成后，第一薄膜晶体管206a、第二薄膜晶体管206b以及第三薄膜晶体管206c就会被关闭，并藉由液晶电容Clc与储存电容Cst等保持各次画素208a, 208b, 208c内画素电极(pixel electrode)的电压位准。然而，当薄膜晶体管206a, 206b, 206c被关闭时，各次画素208a, 208b, 208c内之画素电极的电压位准(level)很容易受到其它周围电压改变的影响而变动，此电压变动量称为馈通电压(VFT)。此外，在液晶面板的作动原理中，是藉由施加于液晶分子的电场大小来改变液晶分子的旋转角度，进而表现出各种灰阶变化。由于施加于液晶分子的电场大小是由各次画素的画素电极与共同电极(common electrode)的电压差所决定，因此当次画素之画素电极的电压位准受到馈通电压(VFT)影响而可调整液晶分子的动态转动。
在一实施例中，所述第一次画素区208a、所述第二次画素区208b以及所述第三次画素区208c分别为红色次画素、绿色次画素以及蓝色次画素。
参考图3，其为本专利申请实施例中液晶面板200的驱动方法的步骤流程图。依据图2之液晶面板200的电路架构示意图，其驱动方法包括下列步骤：
在步骤S300中，施加第一扫描电压至所述第一扫描线SL1R以开启所述第一薄膜晶体管206a，通过所述数据线DL1的数据电压经由第一汲极206d1与第一源极206s1传送至所述第一画素电极208a，使所述第一液晶电容212a充电至第一画素电压。
在步骤S302中，卸载所述第一扫描电压以关闭所述第一薄膜晶体管206a，使所述第一画素电极208a的所述第一画素电压下降一第一馈通电压。
在步骤S304中，施加第二扫描电压至所述第二扫描线SL1G以开启所述第二薄膜晶体管206b，通过所述数据线DL1的数据电压经由第二汲极206d2与第二源极206s2传送至所述第二画素电极208b，使所述第二液晶电容212b充电至第二画素电压，其中所述第一扫描电压与第二扫描电压不相等。
在步骤S306中，卸载所述第二扫描电压以关闭所述第二薄膜晶体管206b，使所述第二画素电极208b的所述第二画素电压下降一第二馈通电压，其中所述第一扫描电压与第二扫描电压个别与所述第一馈通电压与所述第二馈通电压形成正比例相关。
在步骤S308中，施加第三扫描电压至所述第三扫描线SL1B以开启所述第三薄膜晶体管206c，通过所述数据线DL1的数据电压经由第三汲极206d3与第三源极206s3传送至所述第三画素电极208c，使所述第三液晶电容212c充电至第三画素电压，其中所述第一扫描电压、第二扫描电压以及第三扫描电压不相等。
在步骤S310中，卸载所述第三扫描电压以关闭所述第三薄膜晶体管206c，使所述第三画素电极208c的所述第三画素电压下降一第三馈通电压，其中所述第三扫描电压与所述第三馈通电压形成正比例相关。
所述第一馈通电压、所述第二馈通电压以及所述第三馈通电压个别表示为下列方程式：
ΔV1 = Cgs1 * Vpp1/ (Clc1+Cst+Cgs1) ………… (E1)；
ΔV2 = Cgs2 * Vpp2/ (Clc2+Cst+Cgs2) ………… (E2);
ΔV3 = Cgs3 * Vpp3/ (Clc3+Cst+Cgs3) ………… (E3)；
其中ΔV1、ΔV2、ΔV3个别为所述第一馈通电压、第二馈通电压以及第三馈通电压。Cgs1、Cgs2、Cgs3个别为所述第一栅极与所述第一源极之间的第一电容值、所述第二栅极与所述第二源极之间的第二电容值、以及所述第三栅极与所述第三源极之间的第三电容值。Vpp1、Vpp2、Vpp3个别为所述第一扫描电压、第二扫描电压以及第三扫描电压，亦即扫描线开启/关闭薄膜晶体管208a, 208b, 208c的电压差。Clc1、Clc2、Clc3个别为所述第一液晶电容212a、第二液晶电容212b以及第三液晶电容212c。Cst为所述次画素区的存储电容。
参考图4A以及图4B，图4A为本发明第一实施例中液晶面板的一个次画素区的电路布局示意图，图4B为本发明图4A中沿着A-A’线段的剖面示意图。并请参考图2中液晶面板200的电路架构，以彩色滤光片整合晶体管基板(COA)的次画素区204g为例，所述第一次画素区204g包括第一薄膜晶体管206a、第一画素电极208a以及共享电极210，其中栅极绝缘层214与色阻层216设置于第一栅极206g1与第一画素电极208a之间，所述色阻层216a形成第一电容值Cgs1。同样地，在第二次画素区204r中，栅极绝缘层214与色阻层(未图示)设置于第二栅极206g2与第二画素电极208b之间，所述色阻层形成第二电容值Cgs2。此外，在第三次画素区204b中，栅极绝缘层214与色阻层(未图示)设置于第三栅极206g3与第三画素电极208c之间，所述色阻层216a形成第三电容值Cgs3。在一实施例中，Cgs正比于ε * A / d，其中ε为色阻层的介电常数，A为画素电极与栅极的重迭面积，d为画素电极与栅极的距离。
参考图5，其为本发明第一实施例中三个次画素区的驱动方法中调整信号波形之后的波形示意图。横轴为时间，纵轴为信号振幅，包括扫描信号VG、汲极信号VD、源极信号VS以及共享电极信号Vcom。在步骤S300、S304、S308施加扫描电压时，依据上述方程式(E1)、(E2)、(E3)，在一实施例中，当电容值Cgs1 > Cgs2 > Cgs3时，调整所述第一扫描电压、第二扫描电压及/或第三扫描电压，使扫描电压Vpp1 < Vpp2 < Vpp3，并且使馈通电压ΔV1 = ΔV2 = ΔV3。具体来说，调整所述第一扫描电压、第二扫描电压及/或第三扫描电压时，第一、第二、第三汲极电压也会变动，而且第一扫描电压、第二扫描电压及/或第三扫描电压个别与第一、第二、第三源极电压的变动为正相关。而且在薄膜晶体管开启期间，画素电极的电压(相当于源极的电压)趋近于源极的电压值。因此可利用扫描电压来调整馈通电，使其一致，进而改变每一次画素区的画素电极的压降至相同准位，使得每一次画素区的液晶分子在相同灰阶电压之下，三原色的反应时间相同，解决液晶动态转动的色偏现象。
参考图6，为本发明第二实施例中三个次画素区的电压与穿透率的相对应关系图。横轴为电压，纵轴为穿透率，R为红色次画素区(第一次画素区)，G为绿色次画素区(第二次画素区)，B为蓝色次画素区(第三次画素区)，例如在红色次画素区、绿色次画素区以及蓝色次画素区施加一预定数据电压V1时，分别对应不相同的第一穿透率T1、第二穿透率T2以及第三穿透率T3。在一实施例中，当Cgs1 = Cgs2 = Cgs3时，并且若是同时施加于所述第一次画素区、第二次画素区以及第三次画素区的一预定数据电压V1时，分别对应不相同的第一穿透率、第二穿透率以及第三穿透率，则调整所述第一扫描电压、第二扫描电压及/或第三扫描电压，亦即同时调升第一扫描电压、第二扫描电压及第三扫描电压，通过Vpp1 > Vpp2 > Vpp3，使(V1+ΔV1) > (V1+ΔV2) > (V1+ΔV3)，亦即ΔV1 > ΔV2 > ΔV3。换言之，当第一次画素区、第二次画素区以及第三次画素区的接收相同的预定数据电压，但是因维RGB三原色对于电压-穿透率特性曲线造成RGB比例失调，本发明利用扫描电压来修正馈通电压，达到修改预定数据电压的目的，而可解决色温漂移的问题。
在另一实施例中，当Cgs1 = Cgs2 = Cgs3时，调整所述第一扫描电压以及第三扫描电压，亦即调升第一扫描电压但是调降第三扫描电压，使得红色次画素区、绿色次画素区以及蓝色次画素区对应的电压分别为(V1+ΔV1)、V1、V1-ΔV1，以解决色温漂移的问题。
根据上述，本发明液晶面板的驱动方法，可解决色温漂移的问题，以及解决彩色滤光片整合晶体管基板(COA)的液晶面板中RGB三原色的动态反应速度不同造成颜色偏移的问题。
虽然本发明已用较佳实施例揭露如上，然其并非用以限定本发明，本发明所属技术领域中具有通常知识者，在不脱离本发明的精神和范围内，当可作各种的更动与润饰，因此本发明的保护范围当视后附的权利要求范围所界定者为准。
 本发明的实施方式
工业实用性
序列表自由内容

Claims (7)

  1. 一种液晶面板的驱动方法，若干扫描线以及若干数据线互相交错，以形成若干次画素区，所述若干扫描线包括第一扫描线与第二扫描线，所述次画素区包括第一次画素区以及第二次画素区，所述第一次画素区包括第一薄膜晶体管、第一画素电极以及共享电极，所述第二次画素区包括第二薄膜晶体管、第二画素电极以及所述共享电极，所述第一薄膜晶体管包括连接所述第一扫描线之第一栅极、连接所述第一画素电极之第一源极以及连接一数据线之第一汲极，所述第二薄膜晶体管包括连接所述第二扫描线之第二栅极、连接所述第二画素电极之第二源极以及连接所述数据线之第二汲极，所述第一画素电极以及所述第二画素电极个别与所述共享电极形成第一液晶电容以及第二液晶电容，其特征在于，所述驱动方法包括下列步骤：
    (a) 施加第一扫描电压至所述第一扫描线以开启所述第一薄膜晶体管，通过所述数据线的数据电压经由第一汲极与第一源极传送至所述第一画素电极，使所述第一液晶电容充电至第一画素电压；
    (b) 卸载所述第一扫描电压以关闭所述第一薄膜晶体管，使所述第一画素电极的所述第一画素电压下降一第一馈通电压；
    (c) 施加第二扫描电压至所述第二扫描线以开启所述第二薄膜晶体管，通过所述数据线的数据电压经由第二汲极与第二源极传送至所述第二画素电极，使所述第二液晶电容充电至第二画素电压，其中所述第一扫描电压与第二扫描电压不相等；以及
    (d) 卸载所述第二扫描电压以关闭所述第二薄膜晶体管，使所述第二画素电极的所述第二画素电压下降一第二馈通电压，其中所述第一扫描电压与第二扫描电压个别与所述第一馈通电压与所述第二馈通电压形成正比例相关。
  2. 根据权利要求1所述的驱动方法，所述若干扫描线还包括第三扫描线，所述次画素区还包括第三次画素区，所述第三次画素区包括第三薄膜晶体管、第三画素电极以及所述共享电极，所述第三薄膜晶体管包括连接第三扫描线之第三栅极、连接所述第三画素电极之第三源极以及连接所述数据线之第三汲极，所述第三画素电极与所述共享电极形成第三液晶电容，其特征在于，在步骤(d)之后，还包括下列步骤：
    (e) 施加第三扫描电压至所述第三扫描线以开启所述第三薄膜晶体管，通过所述数据线的数据电压经由第三汲极与第三源极传送至所述第三画素电极，使所述第三液晶电容充电至第三画素电压，其中所述第一扫描电压、第二扫描电压以及第三扫描电压不相等；以及
    (f) 卸载所述第三扫描电压以关闭所述第三薄膜晶体管，使所述第三画素电极的所述第三画素电压下降一第三馈通电压，其中所述第三扫描电压与所述第三馈通电压形成正比例相关。
  3. 根据权利要求2所述的驱动方法，其特征在于，其中所述第一馈通电压、所述第二馈通电压以及所述第三馈通电压个别表示为下列方程式：
    ΔV1 = Cgs1 * Vpp1/ (Clc1+Cst+Cgs1)；
    ΔV2 = Cgs2 * Vpp2/ (Clc2+Cst+Cgs2)；及
    ΔV3 = Cgs3 * Vpp3/ (Clc3+Cst+Cgs3)；
    其中ΔV1、ΔV2、ΔV3个别为所述第一馈通电压、第二馈通电压以及第三馈通电压，Cgs1、Cgs2、Cgs3个别为所述第一栅极与所述第一源极之间的第一电容值、所述第二栅极与所述第二源极之间的第二电容值、以及所述第三栅极与所述第三源极之间的第三电容值，Vpp1、Vpp2、Vpp3个别为所述第一扫描电压、第二扫描电压以及第三扫描电压，Clc1、Clc2、Clc3个别为所述第一液晶电容、第二液晶电容以及第三液晶电容，Cst为所述次画素区的存储电容。
  4. 根据权利要求3所述的驱动方法，其特征在于，当Cgs1 > Cgs2 > Cgs3时，调整所述第一扫描电压、第二扫描电压及/或第三扫描电压，使Vpp1 < Vpp2 < Vpp3，并且使ΔV1 = ΔV2 = ΔV3。
  5. 根据权利要求4所述的驱动方法，其特征在于，所述第一汲极的电压大于所述第二汲极的电压，所述第二汲极的电压大于所述第三汲极的电压。
  6. 根据权利要求3所述的驱动方法，其特征在于，当Cgs1 = Cgs2 = Cgs3时，并且若是同时施加于所述第一次画素区、第二次画素区以及第三次画素区的一预定数据电压时，分别对应不相同的第一穿透率、第二穿透率以及第三穿透率，则调整所述第一扫描电压、第二扫描电压及/或第三扫描电压，通过Vpp1 > Vpp2 > Vpp3，使ΔV1 > ΔV2 > ΔV3。
  7. 根据权利要求2所述的驱动方法，其特征在于，所述第一次画素区、所述第二次画素区以及所述第三次画素区分别为红色次画素、绿色次画素以及蓝色次画素。
PCT/CN2011/082746 2011-11-16 2011-11-23 液晶面板的驱动方法 Ceased WO2013071580A1 (zh)

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