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WO2020082469A1 - Tft-lcd面板二次过压补偿方法及装置 - Google Patents

Tft-lcd面板二次过压补偿方法及装置 Download PDF

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Publication number
WO2020082469A1
WO2020082469A1 PCT/CN2018/115979 CN2018115979W WO2020082469A1 WO 2020082469 A1 WO2020082469 A1 WO 2020082469A1 CN 2018115979 W CN2018115979 W CN 2018115979W WO 2020082469 A1 WO2020082469 A1 WO 2020082469A1
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overvoltage compensation
grayscale data
current
overvoltage
module
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PCT/CN2018/115979
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English (en)
French (fr)
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何涛
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深圳市华星光电半导体显示技术有限公司
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Publication of WO2020082469A1 publication Critical patent/WO2020082469A1/zh

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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
    • G09G3/3696—Generation of voltages supplied to electrode drivers

Definitions

  • the present invention relates to the field of display technology, and in particular to a method and device for secondary overvoltage compensation of a TFT-LCD panel.
  • TFT Thin Film Transistor LCD
  • LCD Thin Film Field Effect Transistor LCD
  • A-LCD active matrix type liquid crystal displays
  • the disadvantage of this architecture is that the source drive traces of the panel become longer, which leads to serious RC loading, difficult charging, and ultimately insufficient charging, which causes the panel to have color shift and affect the quality of the panel, especially today's large size and high When resolution panels are prevalent, the color cast is more serious. In order to improve the image quality of the tri-gate panel, it is necessary to improve the color cast.
  • FIG. 1 it is a schematic diagram of the comparison of the charging capacity without overvoltage compensation technology and with overvoltage compensation technology.
  • the vertical axis represents gray scale and the horizontal axis represents time.
  • the gate scanning lines L (n-1), L (n) and L (n + 1) corresponding to the same source line are turned on in time sequence and Closed, when the gate scanning line is turned on, the corresponding gray scale, that is, the gray scale voltage is output through the corresponding source line, that is, the pixel is charged with the corresponding gray scale voltage; the broken line of the source gray scale in FIG.
  • FIGS. 2A and 2B it is a schematic diagram of the shortcomings of the existing overvoltage compensation technology.
  • the target grayscale order becomes 30, 255, and 127
  • the 30 grayscale voltage on the source line first jumps to 255 grayscale voltage.
  • overvoltage compensation technology there is no excess voltage to compensate at 255 gray levels, which results in the optimal brightness of 255 gray levels when the 30 gray levels jump to 255 gray levels, and may only reach the brightness of 240 gray levels, followed by 255 gray levels.
  • jumping to 127 gray scales since the brightness changes from 30 gray scales to 255 gray scales, it can only reach the brightness of 240 gray scales. At this time, when the 255 gray scales are used to jump to 127 gray scales, incorrect overvoltage compensation value will be obtained .
  • the object of the present invention is to provide a method and a device for secondary overvoltage compensation of a TFT-LCD panel, to solve the overvoltage compensation of the target grayscale immediately after there is no excess voltage for the previous target grayscale for overvoltage compensation The value causes incorrect voltage compensation.
  • the present invention provides a secondary overvoltage compensation method for a TFT-LCD panel, including:
  • Step 10 The first overvoltage compensation module obtains the current target grayscale data, obtains the previous actual grayscale data from the buffer module, and obtains the current overvoltage compensation value through the overvoltage compensation technology, and the source line follows the current overvoltage compensation value Output grayscale voltage to charge pixels;
  • Step 20 The second overvoltage compensation module obtains the current target grayscale data, obtains the previous actual grayscale data from the buffer module, obtains the current actual grayscale data through the overvoltage compensation technology, and outputs the current actual grayscale data to the buffer module ;
  • Step 30 The buffer module stores the current actual grayscale data, and outputs the stored previous actual grayscale data to the first overvoltage compensation module and the second overvoltage compensation module.
  • step 30 further includes that, after the buffer module outputs the previous actual grayscale data, deleting the previous actual grayscale data in the buffer module.
  • the initial data of the previous actual gray-scale data stored by the buffer module is 0.
  • the first overvoltage compensation module determines the current overvoltage compensation value from the overvoltage compensation lookup table based on the current target grayscale data and the previous actual grayscale data.
  • the second overvoltage compensation module determines the current actual grayscale data from the overvoltage compensation lookup table based on the current target grayscale data and the previous actual grayscale data.
  • the invention also provides a secondary overvoltage compensation device for the TFT-LCD panel, which includes:
  • the first overvoltage compensation module is used to obtain the current target grayscale data, obtain the previous actual grayscale data from the buffer module, obtain the current overvoltage compensation value through the overvoltage compensation technology, and the source line is compensated according to the current overvoltage
  • the value output gray scale voltage charges the pixel
  • the second overvoltage compensation module is used to obtain the current target grayscale data, obtain the previous actual grayscale data from the buffer module, obtain the current actual grayscale data through the overvoltage compensation technology, and output the current actual grayscale data to the buffer module ;
  • the buffer module is used to store the current actual grayscale data, and output the stored previous actual grayscale data to the first overvoltage compensation module and the second overvoltage compensation module.
  • the buffer module After the buffer module outputs the previous actual grayscale data, the previous actual grayscale data is deleted in the buffer module.
  • the initial data of the previous actual gray-scale data stored by the buffer module is 0.
  • the first overvoltage compensation module determines the current overvoltage compensation value from the overvoltage compensation lookup table based on the current target grayscale data and the previous actual grayscale data.
  • the second overvoltage compensation module determines the current actual grayscale data from the overvoltage compensation lookup table according to the current target grayscale data and the previous actual grayscale data.
  • the method and device for secondary overvoltage compensation of the TFT-LCD panel of the present invention can improve the situation of inaccurate compensation caused by overvoltage compensation without excess voltage through the secondary overvoltage compensation, making the overvoltage compensation more accurate, thereby Improve color cast.
  • Figure 1 is a comparison diagram of the charging capacity without overvoltage compensation technology and with overvoltage compensation technology
  • FIGS. 2A and 2B are schematic diagrams of the shortcomings of the existing overvoltage compensation technology
  • FIG. 3 is a flow chart of the method for secondary overvoltage compensation of the TFT-LCD panel of the present invention.
  • FIG. 4 is a structural block diagram of a preferred embodiment of a secondary overvoltage compensation device for a TFT-LCD panel of the present invention
  • 5A is a schematic diagram of the improvement effect of a preferred embodiment of the second overvoltage compensation method of the TFT-LCD panel of the present invention.
  • FIG. 5B is a schematic diagram of the improvement effect of another preferred embodiment of the second overvoltage compensation method of the TFT-LCD panel of the present invention.
  • FIG. 3 it is a flowchart of a method for secondary overvoltage compensation of a TFT-LCD panel of the present invention.
  • the method mainly includes:
  • Step 10 The first overvoltage compensation module obtains the current target grayscale data, obtains the previous actual grayscale data from the buffer module, and obtains the current overvoltage compensation value through the overvoltage compensation technology, and the source line follows the current overvoltage compensation value
  • the grayscale voltage is output to charge the pixels.
  • the gate scanning lines corresponding to the same source line are turned on and off in time sequence.
  • the source chip outputs the corresponding gray through the corresponding source line
  • the gray scale voltage is the gray scale voltage, and the pixels are charged with the corresponding gray scale voltage to realize the display.
  • the first overvoltage compensation module obtains the current target grayscale data, that is, the grayscale currently to be displayed, and also obtains the previous actual grayscale data, that is, the grayscale actually displayed at the time sequence before the current time sequence, which can be obtained through the overvoltage compensation technology
  • the current overvoltage compensation value specifically, the first overvoltage compensation module may determine the current overvoltage compensation value from a predetermined overvoltage compensation lookup table based on the current target grayscale data and the previous actual grayscale data .
  • the source chip may output a gray-scale voltage to charge the pixel according to the obtained current overvoltage compensation value through the corresponding source line.
  • Step 20 The second overvoltage compensation module obtains the current target grayscale data, obtains the previous actual grayscale data from the buffer module, obtains the current actual grayscale data through the overvoltage compensation technology, and outputs the current actual grayscale data to the buffer module .
  • the second overvoltage compensation module obtains the current target grayscale data, that is, the grayscale currently to be displayed, and also obtains the previous actual grayscale data, that is, the grayscale actually displayed at the time sequence before the current time sequence, which can be obtained through the overvoltage compensation technology
  • the current actual grayscale data is the grayscale that the current target grayscale data can actually show after overvoltage compensation; specifically, the second overvoltage compensation module can be based on the current target grayscale data and the previous actual For the gray scale data, the current actual gray scale data is determined from a predetermined overvoltage compensation look-up table; and the current actual gray scale data can be further input into the buffer module and stored by the buffer module.
  • Step 30 The buffer module stores the current actual grayscale data, and outputs the stored previous actual grayscale data to the first overvoltage compensation module and the second overvoltage compensation module. Because the panel is displayed in a scanning manner according to the timing, the buffer module usually stores the previous actual grayscale data of the previous timing before the current timing before storing the current actual grayscale data; for the initial situation, the buffer can be The initial data of the previous actual grayscale data stored by the module is set to 0. After the previous actual grayscale data is output to the first overvoltage compensation module and the second overvoltage compensation module according to the preset timing, the previous actual grayscale data can be deleted in the buffer module, which can save storage space.
  • the present invention can also provide a TFT-LCD panel secondary overvoltage compensation device that implements the foregoing method, and the TFT-LCD panel secondary overvoltage compensation device of the present invention can be understood based on the foregoing method.
  • FIG. 4 is a structural block diagram of a preferred embodiment of a secondary overvoltage compensation device for a TFT-LCD panel of the present invention, which mainly includes:
  • the first overvoltage compensation module 1 is used to obtain the current target grayscale data, obtain the previous actual grayscale data from the buffer module 3, obtain the current overvoltage compensation value through the overvoltage compensation technology, and the source line according to the current overvoltage
  • the compensation value outputs gray-scale voltage to charge the pixels
  • the second overvoltage compensation module 2 is used to obtain the current target grayscale data, obtain the previous actual grayscale data from the buffer module 3, obtain the current actual grayscale data through the overvoltage compensation technology, and output the current actual grayscale data to Buffer module 3;
  • the buffer module 3 is used to store the current actual grayscale data, and output the stored previous actual grayscale data to the first overvoltage compensation module 1 and the second overvoltage compensation module 2.
  • FIG. 5A it is a schematic diagram of the improvement effect of a preferred embodiment of the secondary overvoltage compensation method of the TFT-LCD panel of the present invention.
  • the initial previous actual gray level data can be set to 0.
  • the buffer module stores the current actual gray level data 30;
  • the previous actual gray scale data is 0 and the current target gray scale is 30, the correct current overvoltage compensation value is output after being processed by the first overvoltage compensation module.
  • the current target gray scale changes from 30 to 255
  • the previous actual gray scale data output by the buffer module is 30, and the current actual gray scale data is 240 after being processed by the second overvoltage compensation module, that is, it can only reach 240 brightness
  • the buffer module stores the current actual grayscale data 240.
  • the previous actual grayscale data is 30 and the current target grayscale is 255.
  • the correct current overvoltage compensation value is output.
  • the current target gray scale changes from 255 to 127
  • the previous actual gray scale data output by the buffer module is 240
  • the current actual gray scale data is 127 after processing by the second overvoltage compensation module
  • the buffer module stores the current actual gray scale Data 127.
  • the previous actual gray scale data is 240
  • the current target gray scale is 127.
  • the correct current over-voltage compensation value is output, so that the target gray scale 127 can be just reached.
  • the source chip may output a gray-scale voltage to charge the pixel according to the obtained current overvoltage compensation value through the corresponding source line.
  • the secondary overvoltage compensation can improve the inaccurate compensation caused by overvoltage compensation without excess voltage, make the overvoltage compensation more accurate, and thus improve the color shift.
  • FIG. 5B it is a schematic diagram of the improvement effect of another preferred embodiment of the secondary overvoltage compensation method of the TFT-LCD panel of the present invention.
  • the initial previous actual gray scale data can be set to 0.
  • the current actual gray scale data is 127, and the buffer module stores the current actual gray scale data 127;
  • the correct current overvoltage compensation value is output after being processed by the first overvoltage compensation module.
  • the current target gray level changes from 127 to 0, the previous actual gray level data output by the buffer module is 127, and after processing by the second overvoltage compensation module, the current actual gray level data is 10, that is, it can only reach 10 brightness
  • the buffer module stores the current actual grayscale data 10, and the previous actual grayscale data is 127, and the current target grayscale is 0. After processing by the first overvoltage compensation module, the correct current overvoltage compensation value is output.
  • the current target gray level changes from 0 to 200
  • the previous actual gray level data output by the buffer module is 10
  • the current actual gray level data is processed by the second overvoltage compensation module to obtain 200
  • the buffer module stores the current actual gray level Data 200.
  • the previous actual grayscale data is 10
  • the current target grayscale is 200.
  • the correct current overvoltage compensation value is output, so that the target grayscale 200 can be just reached.
  • the process shown in FIGS. 5A and 5B can be processed in the same way.
  • the method and device for secondary overvoltage compensation of the TFT-LCD panel of the present invention can improve the situation of inaccurate compensation caused by overvoltage compensation without excess voltage through the secondary overvoltage compensation, making the overvoltage compensation more accurate, thereby Improve color cast.

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Abstract

一种TFT-LCD面板二次过压补偿方法包括：步骤10、第一过压补偿模块(1)获取当前目标灰阶数据，获取来自缓冲模块(3)的前一实际灰阶数据，得到当前过压补偿值，源极线按照当前过压补偿值输出灰阶电压对像素充电；步骤20、第二过压补偿模块(2)获取当前目标灰阶数据，获取来自缓冲模块(3)的前一实际灰阶数据，得到当前实际灰阶数据，输出该当前实际灰阶数据至缓冲模块(3)；步骤30、缓冲模块(3)存储当前实际灰阶数据，输出所存储的前一实际灰阶数据至第一和第二过压补偿模块(1和2)。TFT-LCD面板二次过压补偿方法及装置通过二次过压补偿，可改善无多余的电压做过压补偿导致的补偿不准确的情况，使过压补偿更加准确，从而改善色偏。

Description

TFT-LCD面板二次过压补偿方法及装置 技术领域
本发明涉及显示技术领域，尤其涉及一种TFT-LCD面板二次过压补偿方法及装置。
背景技术
TFT(Thin Film Transistor)LCD即薄膜场效应晶体管LCD，是有源矩阵类型液晶显示器(AM-LCD)中的一种。当今面板市场趋于饱和，市场价格不断降低，为了谋取盈利，改善创新降低成本势在必行。为了降低源极(Source)驱动芯片(IC)的个数，降低成本，人们提出了面板三栅极(tri gate)架构，即栅极(gate)扫描线数量变为原来的3倍，RGB子像素竖向排列，源极驱动芯片数量变为原来的1/3，大大降低成本。但这种架构缺点是面板的源极驱动走线变长，导致阻容负载(RC Loading)严重，充电困难，最终充电不足，使面板出现色偏，影响面板品质，特别是当今大尺寸、高解析度面板盛行的情况下，色偏更是严重。为提高三栅极面板画质，就需要改善色偏。
现有技术中采用过压补偿(OD)技术来提高充电能力，从而改善色偏。如图1所示，其为未采用过压补偿技术与采用过压补偿技术的充电能力比较示意图。图1中，纵轴表示灰阶，横轴表示时间，对应于同一源极线的栅极扫描线L(n－1)，L(n)及L(n+1)等按照时序顺序开启及关闭，当栅极扫描线开启时，通过相应的源极线输出相应的灰阶即灰阶电压，也就是以相应的灰阶电压向像素充电；图1中源灰阶的折线表示通过源极线输入的用于充电的灰阶电压的变化趋势，曲线表示像素实际的充电效果。图1中左侧展示未采用过压补偿技术的充电效果，为将像素充电至目标灰阶，源极线输出的灰阶与目标灰阶一致，结果最终得到的曲线偏离了目标灰阶；图1中右侧展示采用过压补偿技术的充电效果，在过压补偿技术中，可以根据目标灰阶和源极线上的初始灰阶利用过压补偿查找表确定源极线需要输出的过压补偿值，源极线按照过压补偿值输出灰阶对像素进行充电，最终得到的实线曲线更接近于目标灰阶，作为对比，图1中右侧还以虚线曲线展示未采用过压补偿技术的充电效果。
如图2A和图2B所示，其为现有的过压补偿技术所存在的不足点示意图。
如图2A所示，当在1帧时间输入数据为R_G_B＝30_255_127时，即目标灰阶顺序变为30、255及127，源极线上30灰阶电压首先跳变至255灰阶电压，现有过压补偿技术在255灰阶没有多余电压做补偿，导致30灰阶跳变到255灰阶时不能达到255灰阶的最佳亮度，可能只达到240灰阶的亮度，紧接着255灰阶跳变至127灰阶时，由于30灰阶跳变至255灰阶时只能达到240灰阶的亮度，此时用255灰阶跳变至127灰阶时会得到不正确的过压补偿值。
如图2B所示，当在1帧时间输入数据为输入R_G_B＝127_0_200时，即目标灰阶顺序变为127、0及200，源极线上127灰阶电压首先跳变至0灰阶电压，现有过压补偿技术在0灰阶没有多余电压做补偿，导致127灰阶跳变到0灰阶时不能达到0灰阶的最佳亮度，可能只达到10灰阶的亮度，紧接着0灰阶跳变至200灰阶时，由于127灰阶跳变至0灰阶时只能达到10灰阶的亮度，此时用0灰阶跳变至200灰阶会得到不正确的过压补偿值。
当目标灰阶在接近255灰阶附近或接近0灰阶附近，虽然有多余电压去做过压补偿，但多余的电压还是不够补偿到目标灰阶，这时也会出现图2A和图2B所示的问题。现有过压补偿技术的缺陷在于，当遇到前一个目标灰阶没有多余的电压做过压补偿时，后面紧接的目标灰阶的过压补偿值会导致电压补偿不正确，引起色偏补偿不佳。
发明内容
因此，本发明的目的在于提供一种TFT-LCD面板二次过压补偿方法及装置，解决前一个目标灰阶没有多余的电压做过压补偿时，后面紧接的目标灰阶的过压补偿值导致电压补偿不正确问题。
为实现上述目的，本发明提供了一种TFT-LCD面板二次过压补偿方法，包括：
步骤10、第一过压补偿模块获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前过压补偿值，源极线按照该当前过压补偿值输出灰阶电压对像素充电；
步骤20、第二过压补偿模块获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前实际灰阶数据，输出该当前实际灰阶数据至缓冲模块；
步骤30、缓冲模块存储该当前实际灰阶数据，输出所存储的该前一实际灰阶数据至该第一过压补偿模块和第二过压补偿模块。
其中，步骤30还包括，该缓冲模块输出该前一实际灰阶数据后，在该 缓冲模块中删除该前一实际灰阶数据。
其中，该缓冲模块所存储的该前一实际灰阶数据的初始数据为0。
其中，步骤10中，该第一过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前过压补偿值。
其中，步骤20中，该第二过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前实际灰阶数据。
本发明还提供了一种TFT-LCD面板二次过压补偿装置，包括：
第一过压补偿模块，用于获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到该当前过压补偿值，源极线按照该当前过压补偿值输出灰阶电压对像素充电；
第二过压补偿模块，用于获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前实际灰阶数据，输出该当前实际灰阶数据至缓冲模块；
缓冲模块，用于存储该当前实际灰阶数据，输出所存储的该前一实际灰阶数据至该第一过压补偿模块和第二过压补偿模块。
其中，该缓冲模块输出该前一实际灰阶数据后，在该缓冲模块中删除该前一实际灰阶数据。
其中，该缓冲模块所存储的该前一实际灰阶数据的初始数据为0。
其中，该第一过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前过压补偿值。
其中，该第二过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前实际灰阶数据。
综上，本发明的TFT-LCD面板二次过压补偿方法及装置通过二次过压补偿可改善无多余的电压做过压补偿导致的补偿不准确的情况，使过压补偿更加准确，从而改善色偏。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为未采用过压补偿技术与采用过压补偿技术的充电能力比较示意图；
图2A和图2B为现有的过压补偿技术所存在的不足点示意图；
图3为本发明TFT-LCD面板二次过压补偿方法的流程图；
图4为本发明TFT-LCD面板二次过压补偿装置一较佳实施例的结构方框图；
图5A为本发明TFT-LCD面板二次过压补偿方法一较佳实施例的改善效果示意图；
图5B为本发明TFT-LCD面板二次过压补偿方法又一较佳实施例的改善效果示意图。
具体实施方式
参见图3，其为本发明TFT-LCD面板二次过压补偿方法的流程图，该方法主要包括：
步骤10、第一过压补偿模块获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前过压补偿值，源极线按照该当前过压补偿值输出灰阶电压对像素充电。
三栅极TFT-LCD面板进行显示时，对应于同一源极线的栅极扫描线按照时序顺序开启及关闭，当栅极扫描线开启时，源极芯片通过相应的源极线输出相应的灰阶数据即灰阶电压，以相应的灰阶电压向像素充电以实现显示。第一过压补偿模块获取当前目标灰阶数据也就是当前欲显示的灰阶，还获取前一实际灰阶数据也就是当前时序之前一时序实际显示的灰阶，从而可以通过过压补偿技术得到当前过压补偿值；具体来说，该第一过压补偿模块可以根据该当前目标灰阶数据和前一实际灰阶数据，从预先确定的过压补偿查找表中确定该当前过压补偿值。得到当前过压补偿值后，源极芯片可以通过相应的源极线按照所得到的当前过压补偿值输出灰阶电压对像素充电。
步骤20、第二过压补偿模块获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前实际灰阶数据，输出该当前实际灰阶数据至缓冲模块。第二过压补偿模块获取当前目标灰阶数据也就是当前欲显示的灰阶，还获取前一实际灰阶数据也就是当前时序之前一时序实际显示的灰阶，从而可以通过过压补偿技术得到当前实际灰阶数据也就是获得当前目标灰阶数据在经过过压补偿后可以实际表现出的灰阶；具体来说，该第二过压补偿模块可以根据该当前目标灰阶数据和前一实际灰阶数据，从预先确定的过压补偿查找表中确定该当前实际灰阶数据；并且可以进一步将该当前实际灰阶数据输入缓冲模块由缓冲模块存储。
步骤30、缓冲模块存储该当前实际灰阶数据，输出所存储的该前一实际灰阶数据至该第一过压补偿模块和第二过压补偿模块。由于面板是按照 时序以扫描的方式进行显示，因此缓冲模块在存储当前实际灰阶数据之前，通常预先存储了当前时序之前一时序的前一实际灰阶数据；对于初始的情况，可以将该缓冲模块所存储的该前一实际灰阶数据的初始数据设置为0。该前一实际灰阶数据按照预设时序输出给第一过压补偿模块和第二过压补偿模块后，可以在该缓冲模块中删除该前一实际灰阶数据，可以节省存储空间。
基于前述方法，本发明还可以提供实现前述方法的TFT-LCD面板二次过压补偿装置，可以基于前述方法来理解本发明的TFT-LCD面板二次过压补偿装置。参见图4，其为本发明TFT-LCD面板二次过压补偿装置一较佳实施例的结构方框图，主要包括：
第一过压补偿模块1，用于获取当前目标灰阶数据，获取来自缓冲模块3的前一实际灰阶数据，通过过压补偿技术得到当前过压补偿值，源极线按照该当前过压补偿值输出灰阶电压对像素充电；
第二过压补偿模块2，用于获取当前目标灰阶数据，获取来自缓冲模块3的前一实际灰阶数据，通过过压补偿技术得到当前实际灰阶数据，输出该当前实际灰阶数据至缓冲模块3；
缓冲模块3，用于存储该当前实际灰阶数据，输出所存储的该前一实际灰阶数据至该第一过压补偿模块1和第二过压补偿模块2。
参见图5A，其为本发明TFT-LCD面板二次过压补偿方法一较佳实施例的改善效果示意图，图5A中目标灰阶以R_G_B＝30_255_127为例，按照预设时序变化。
当前目标灰阶为30时，初始的前一实际灰阶数据可以设置为0，经过第二过压补偿模块处理后得到当前实际灰阶数据为30，缓冲模块存储当前实际灰阶数据30；此时前一实际灰阶数据为0，当前目标灰阶为30，经过第一过压补偿模块处理后输出正确的当前过压补偿值。
然后，当前目标灰阶由30变化为255，缓冲模块输出的前一实际灰阶数据为30，经过第二过压补偿模块处理后得到当前实际灰阶数据为240，也就是只能达到240亮度，缓冲模块存储当前实际灰阶数据240，此时前一实际灰阶数据为30，当前目标灰阶为255，经过第一过压补偿模块处理后输出正确的当前过压补偿值。
随后，当前目标灰阶由255变化为127，缓冲模块输出的前一实际灰阶数据为240，经过第二过压补偿模块处理后得到当前实际灰阶数据为127，缓冲模块存储当前实际灰阶数据127，此时前一实际灰阶数据为240，当前目标灰阶为127，经过第一过压补偿模块处理后输出正确的当前过压补偿值， 从而可以刚好达到目标灰阶127。
得到当前过压补偿值后，源极芯片可以通过相应的源极线按照所得到的当前过压补偿值输出灰阶电压对像素充电。通过二次过压补偿可改善无多余的电压做过压补偿导致的补偿不准确的情况，使过压补偿更加准确，从而改善色偏。
参见图5B，其为本发明TFT-LCD面板二次过压补偿方法又一较佳实施例的改善效果示意图，图5B中目标灰阶以R_G_B＝127_0_200为例，按照预设时序变化。
当前目标灰阶为127时，初始的前一实际灰阶数据可以设置为0，经过第二过压补偿模块处理后得到当前实际灰阶数据为127，缓冲模块存储当前实际灰阶数据127；此时前一实际灰阶数据为0，当前目标灰阶为127，经过第一过压补偿模块处理后输出正确的当前过压补偿值。
然后，当前目标灰阶由127变化为0，缓冲模块输出的前一实际灰阶数据为127，经过第二过压补偿模块处理后得到当前实际灰阶数据为10，也就是只能达到10亮度，缓冲模块存储当前实际灰阶数据10，此时前一实际灰阶数据为127，当前目标灰阶为0，经过第一过压补偿模块处理后输出正确的当前过压补偿值。
随后，当前目标灰阶由0变化为200，缓冲模块输出的前一实际灰阶数据为10，经过第二过压补偿模块处理后得到当前实际灰阶数据为200，缓冲模块存储当前实际灰阶数据200，此时前一实际灰阶数据为10，当前目标灰阶为200，经过第一过压补偿模块处理后输出正确的当前过压补偿值，从而可以刚好达到目标灰阶200。
当目标灰阶为接近255灰阶附近或接近0灰阶附近的组合时，可以参照图5A及图5B所示过程同理进行处理。
综上，本发明的TFT-LCD面板二次过压补偿方法及装置通过二次过压补偿可改善无多余的电压做过压补偿导致的补偿不准确的情况，使过压补偿更加准确，从而改善色偏。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (10)

  1. 一种TFT-LCD面板二次过压补偿方法，包括：
    步骤10、第一过压补偿模块获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前过压补偿值，源极线按照该当前过压补偿值输出灰阶电压对像素充电；
    步骤20、第二过压补偿模块获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前实际灰阶数据，输出该当前实际灰阶数据至缓冲模块；
    步骤30、缓冲模块存储该当前实际灰阶数据，输出所存储的该前一实际灰阶数据至该第一过压补偿模块和第二过压补偿模块。
  2. 如权利要求1所述的TFT-LCD面板二次过压补偿方法，其中，步骤30还包括，该缓冲模块输出该前一实际灰阶数据后，在该缓冲模块中删除该前一实际灰阶数据。
  3. 如权利要求1所述的TFT-LCD面板二次过压补偿方法，其中，该缓冲模块所存储的该前一实际灰阶数据的初始数据为0。
  4. 如权利要求1所述的TFT-LCD面板二次过压补偿方法，其中，步骤10中，该第一过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前过压补偿值。
  5. 如权利要求1所述的TFT-LCD面板二次过压补偿方法，其中，步骤20中，该第二过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前实际灰阶数据。
  6. 一种TFT-LCD面板二次过压补偿装置，包括：
    第一过压补偿模块，用于获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前过压补偿值，源极线按照该当前过压补偿值输出灰阶电压对像素充电；
    第二过压补偿模块，用于获取当前目标灰阶数据，获取来自缓冲模块的前一实际灰阶数据，通过过压补偿技术得到当前实际灰阶数据，输出该当前实际灰阶数据至缓冲模块；
    缓冲模块，用于存储该当前实际灰阶数据，输出所存储的该前一实际灰阶数据至该第一过压补偿模块和第二过压补偿模块。
  7. 如权利要求6所述的TFT-LCD面板二次过压补偿装置，其中，该缓冲模块输出该前一实际灰阶数据后，在该缓冲模块中删除该前一实际灰 阶数据。
  8. 如权利要求6所述的TFT-LCD面板二次过压补偿装置，其中，该缓冲模块所存储的该前一实际灰阶数据的初始数据为0。
  9. 如权利要求6所述的TFT-LCD面板二次过压补偿装置，其中，该第一过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前过压补偿值。
  10. 如权利要求6所述的TFT-LCD面板二次过压补偿装置，其中，该第二过压补偿模块根据该当前目标灰阶数据和前一实际灰阶数据，从过压补偿查找表中确定该当前实际灰阶数据。
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