CN101398584B - 液晶显示装置驱动方法 - Google Patents

液晶显示装置驱动方法 Download PDF

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CN101398584B
CN101398584B CN2007101752087A CN200710175208A CN101398584B CN 101398584 B CN101398584 B CN 101398584B CN 2007101752087 A CN2007101752087 A CN 2007101752087A CN 200710175208 A CN200710175208 A CN 200710175208A CN 101398584 B CN101398584 B CN 101398584B
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tft
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liquid crystal
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CN101398584A (zh
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郑喆奎
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BOE Technology Group Co Ltd
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    • GPHYSICS
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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    • G09G3/34Control 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
    • G09G3/36Control 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
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
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    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract

本发明涉及一种液晶显示装置驱动方法,包括:根据液晶面板各TFT所在的栅极行号对数据线输入电压进行补偿;将所述补偿后的数据线输入电压向液晶面板输出。本发明首先根据液晶面板各TFT所在的栅极行号对输入电压进行补偿,然后将所述补偿后的输入电压向各行TFT输出,随着栅极行号的增加,使输入电压逐渐增大,以保证所有栅线上像素的充电量,解决了由高分辨率和大尺寸面板近端和远端负载差异产生的充电延迟问题,使面板的均一性得以保证,提高了画面的显示质量。

Description

液晶显示装置驱动方法
技术领域
本发明涉及一种显示装置的控制方法,特别是一种液晶显示装置驱动方法。
背景技术
薄膜晶体管液晶显示装置(TFT-LCD)具有重量轻、厚度薄和使用功率低等特点,广泛应用于手机、显示器、电视机等装置中。
TFT-LCD主要包括液晶面板、栅驱动器、数据驱动器、时序控制器和背光源。液晶面板由阵列基板和彩膜基板以及设置在其间的液晶构成,数据线和栅线形成在阵列基板上,设置在栅线和数据线交叉处的TFT用于将数据信号传送到液晶面板中。栅驱动器用于向栅线提供脉冲信号,数据驱动器向数据线提供数据流。背光源用于向液晶面板提供光亮,背光源包括光源和包裹光源的外框和扩散板,背光源由逆变器控制,多个背光源根据逆变器的控制信号依次启动,光线通过反射板和扩散板向液晶面板方向射出。时序控制器用于根据输入的同步信号(水平同步信号、垂直同步信号、数据有效信号)生成各部分所需的数据线控制信号和栅线控制信号,同时驱动逆变器。数据驱动器把被输入的信号根据时序控制器生成的控制信号转换成液晶所需要的数据线输入电压并输入到TFT,被输入的数据根据时序控制器的信号同步工作。
上述现有TFT-LCD在使用时,不同栅线行上TFT的工作状况存在一定差别,特别在高分辨率、线负载很大的大型面板中,在相同的栅线驱动时间内,不同栅线行上TFT所驱动的像素会出现不同的充电延迟。图5为现有技术向各栅极行号TFT输出电压的示意图,相对于离输入端最近的第1行栅线G1,由于数据线负载引起的延迟,离输入端越远,像素充电延迟越大,导致离输入端最远的第n行栅线Gn上的像素在1行时间(1H time)内不能达到所需的充电量,因此导致面板显示不均匀,影响整体画面显示质量。
发明内容
本发明的目的是提供一种液晶显示装置驱动方法,有效解决现有液晶显示装置由于像素充电延迟导致面板显示不均匀等技术缺陷。
为了实现上述目的,本发明提供了一种液晶显示装置驱动方法,包括:
步骤1、根据液晶面板各TFT所在的栅极行号对数据线输入电压进行补偿,使随着TFT所在的栅极行号的增加,数据线输入电压值逐渐增大;
步骤2、将所述补偿后的数据线输入电压向液晶面板输出。
其中,所述步骤1具体为:
步骤11、令i=1,j=1;
步骤12、读取第i行、第j个TFT的数据线输入电压;
步骤13、根据所述TFT所在的栅极行号和数据线输入电压值在补偿表中查找对应的补偿值,所述补偿表记载了与TFT所在的栅极行号和数据线输入电压相关的补偿值,使随着TFT所在的栅极行号的增加,数据线输入电压值逐渐增大;
步骤14、将所述补偿值加在所述第i行、第j个TFT的数据线输入电压上,形成补偿后的数据线输入电压;
步骤15、判断j=m,是则执行步骤17,否则执行步骤16,其中m为一行中TFT的个数;
步骤16、令j=j+1,执行步骤12;
步骤17、判断i=n,是则执行步骤19,否则执行步骤18,其中n为TFT的行数;
步骤18、令i=i+1,执行步骤12;
步骤19、数据线输入电压补偿完毕。
本发明针对现有液晶显示装置中因数据线负载引起像素充电延迟问题,提出了一种通过输入电压补偿确保像素充电量的液晶显示装置驱动方法。本发明首先根据液晶面板各TFT所在的栅极行号对输入电压进行补偿,然后将所述补偿后的输入电压向各行TFT输出,随着栅极行号的增加,使输入电压逐渐增大,以保证所有栅线上像素的充电量。上述技术方案解决了由高分辨率和大尺寸面板近端和远端负载差异产生的充电延迟问题,使面板的均一性得以保证,提高了画面的显示质量。
下面通过附图和实施例,对本发明的技术方案做进一步的详细描述。
附图说明
图1为本发明液晶显示装置驱动方法的流程图;
图2为本发明对数据线输入电压进行补偿的流程图;
图3为本发明向各栅极行号TFT输出电压的示意图;
图4为采用本发明液晶显示装置驱动方法的液晶显示装置结构示意图;
图5为现有技术向各栅极行号TFT输出电压的示意图。
附图标记说明:
10-液晶面板;    11-栅线;              12-数据线;
13-TFT;         20-时序控制变换器;    30-时序控制器;
40-栅驱动器;    50-数据驱动器。
具体实施方式
图1为本发明液晶显示装置驱动方法的流程图,具体为:
步骤1、根据液晶面板各TFT所在的栅极行号对数据线输入电压进行补偿;
步骤2、将所述补偿后的数据线输入电压向液晶面板输出。
本发明液晶显示装置驱动方法针对现有液晶显示装置中因数据线负载引起像素充电延迟问题,提出了一种通过补偿输入电压确保像素充电量的技术方案。液晶显示装置包括液晶面板,液晶面板包括以行排列的栅线和以列排列的数据线,行排列的栅线和列排列的数据线的交叉处形成有驱动像素的TFT,数据线输入电压通过数据线向各栅线行对应的各行TFT输入,在各TFT上施加电压,使该处的像素充电。由于数据线上各TFT的存在,数据线的负载逐渐增加,为了补偿数据线负载增加引起的像素充电延迟,本发明首先根据液晶面板各TFT所在的栅极行号对输入电压进行补偿,然后将所述补偿后的输入电压向各行TFT输出,使液晶面板各行TFT处的像素在相同时间内达到所需的充电量。
图2为本发明对数据线输入电压进行补偿的流程图,具体为:
步骤11、令i=1,j=1;
步骤12、读取第i行、第j个TFT的数据线输入电压;
步骤13、根据所述TFT所在的栅极行号和数据线输入电压值在补偿表中查找对应的补偿值;
步骤14、将所述补偿值加在所述第i行、第j个TFT的数据线输入电压上,形成补偿后的数据线输入电压;
步骤15、判断j=m,是则执行步骤17,否则执行步骤16,其中m为一行中TFT的个数;
步骤16、令j=j+1,执行步骤12;
步骤17、判断i=n,是则执行步骤19,否则执行步骤18,其中n为TFT的行数;
步骤18、令i=i+1,执行步骤12;
步骤19、数据线输入电压补偿完毕。
在图2所示技术方案中,本发明建立有一张补偿表,其中记载了与TFT所在的栅极行号和数据线输入电压相关的补偿值。补偿表的行表示液晶面板的栅极行号(1~n),补偿表的列表示数据线输入电压,补偿表记载了某一TFT对应所在的栅极行号和对应数据线输入电压的补偿值。本发明依次读入每行TFT中每个TFT的数据线输入电压,根据该TFT所在的栅极行号和其所具有的数据线输入电压,就可以查到该TFT所对应的补偿值,将得到的补偿值加在该TFT的数据线输入电压上,就形成补偿后的数据线输入电压。该补偿后的数据线输入电压向各行TFT输出,就改变了施加在该TFT上的电压值,使液晶面板各行TFT处的像素在相同时间内达到所需的充电量。本发明补偿表可以通过试验获得,根据液晶面板的尺寸、型式、分辨率和模式,补偿表内的补偿值也不同。
图3为本发明向各栅极行号TFT输出电压的示意图。如图3所示,输入电压经过补偿后,通过数据线向各行栅线上的TFT输出的数据线输入电压是变化的,随着栅极行号的增加,数据线上的负载增大,因此输出的数据线输入电压逐渐增大,以保证所有栅线上的TFT在栅极驱动时间内达到所需的充电量。具体地,对于第1行栅线G1,由于该行上的TFT距离数据线的输入端最近,负载最小,因此输出的数据线输入电压较小;对于第100行栅线G100,该行上的TFT距离数据线的输入端较远,因此向该行上的TFT输出的数据线输入电压较向第1行栅线G1上TFT输出的数据线输入电压大;对于第n行栅线Gn,由于该行上的TFT距离数据线的输入端最远,负载最大,因此向该行上的TFT输出的数据线输入电压最大。通过上述技术方案,有效保证了数据线末端的充电量,使所有栅线上的TFT在1行时间内均像素达到所需的充电量,面板的均一性得以保证,提高了画面的显示质量。
图4为采用本发明液晶显示装置驱动方法的液晶显示装置的结构示意图。如图4所示,液晶显示装置包括液晶面板10、时序控制变换器20、栅驱动器40和数据驱动器50,液晶面板10包括栅线11、数据线12和形成在栅线与数据线交叉处的TFT13;时序控制变换器20用于根据输入的同步信号生成数据线控制信号和栅线控制信号;栅驱动器40与时序控制变换器20连接,用于根据时序控制变换器20的栅线控制信号生成栅线脉冲信号,并通过栅线11输入到液晶面板的TFT;数据驱动器50包括数个与时序控制变换器20连接的数据驱动模块,用于根据时序控制变换器20的数据线控制信号将数据线输入电压通过数据线12输入到液晶面板的TFT。
为了实现数据线输入电压补偿,本发明数据驱动器内设置有数据变换模块,数据变换模块用于根据液晶面板各TFT所在的栅极行号对数据线输入电压进行补偿使随着TFT所在的栅极行号的增加,数据驱动器输出的数据线输入电压值逐渐增大。具体地,本发明数据变换模块中存储有一张补偿表,其中记载了与TFT所在的栅极行号和数据线输入电压相关的补偿值。补偿表的行表示液晶面板的栅极行号(1~n),补偿表的列表示数据线输入电压,补偿表记载了某一TFT对应所在的栅极行号和对应数据线输入电压的补偿值。数据变换模块依次读入每行TFT中每个TFT的数据线输入电压,根据该TFT所在的行和其所具有的数据线输入电压,就可以查到该TFT所对应的补偿值,将得到的补偿值加在该TFT的数据线输入电压上,就形成补偿后的数据线输入电压。该补偿后的数据线输入电压通过数据线向各行TFT输出,就改变了施加在该TFT上的电压值,使液晶面板各行TFT处的像素在栅极驱动时间内达到所需的充电量,面板的均一性得以保证,提高了画面的显示质量。
最后应说明的是:以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围。

Claims (2)

1.一种液晶显示装置驱动方法,其特征在于,包括:
步骤1、根据液晶面板各TFT所在的栅极行号对数据线输入电压进行补偿,使随着TFT所在的栅极行号的增加,数据线输入电压值逐渐增大;
步骤2、将所述补偿后的数据线输入电压向液晶面板输出。
2.根据权利要求1所述的液晶显示装置驱动方法,其特征在于,所述步骤1具体为:
步骤11、令i=1,j=1;
步骤12、读取第i行、第j个TFT的数据线输入电压;
步骤13、根据所述TFT所在的栅极行号和数据线输入电压值在补偿表中查找对应的补偿值,所述补偿表记载了与TFT所在的栅极行号和数据线输入电压相关的补偿值,使随着TFT所在的栅极行号的增加,数据线输入电压值逐渐增大;
步骤14、将所述补偿值加在所述第i行、第j个TFT的数据线输入电压上,形成补偿后的数据线输入电压;
步骤15、判断j=m,是则执行步骤17,否则执行步骤16,其中m为一行中TFT的个数;
步骤16、令j=j+1,执行步骤12;
步骤17、判断i=n,是则执行步骤19,否则执行步骤18,其中n为TFT的行数;
步骤18、令i=i+1,执行步骤12;
步骤19、数据线输入电压补偿完毕。
CN2007101752087A 2007-09-27 2007-09-27 液晶显示装置驱动方法 Expired - Fee Related CN101398584B (zh)

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JP2008141731A JP2009086630A (ja) 2007-09-27 2008-05-29 液晶表示装置の駆動方法
KR1020080050406A KR100960860B1 (ko) 2007-09-27 2008-05-29 액정 디스플레이 소자 구동 방법

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