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CN105355181A - 液晶显示面板的驱动方法及液晶显示面板 - Google Patents

液晶显示面板的驱动方法及液晶显示面板 Download PDF

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CN105355181A
CN105355181A CN201510882132.6A CN201510882132A CN105355181A CN 105355181 A CN105355181 A CN 105355181A CN 201510882132 A CN201510882132 A CN 201510882132A CN 105355181 A CN105355181 A CN 105355181A
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liquid crystal
display panels
pixel
crystal display
driving method
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郝思坤
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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 CN201510882132.6A priority Critical patent/CN105355181A/zh
Priority to US14/905,969 priority patent/US20170162143A1/en
Priority to PCT/CN2015/099655 priority patent/WO2017092137A1/zh
Publication of CN105355181A publication Critical patent/CN105355181A/zh
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    • 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
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    • 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
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    • 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
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    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment
    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2300/0426—Layout of electrodes and connections
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Abstract

本发明提供一种液晶显示面板的驱动方法及液晶显示面板，所述驱动方法包括如下步骤：将一幅画面使用两帧图像显示，两帧图像使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向；将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。本发明的优点在于，将一幅画面使用两帧不同驱动电压驱动的图像叠加显示，使对应像素的液晶分子具有两种取向，改善垂直取向液晶显示器大视角对比下降和色偏等缺点，使其视角更广，本发明液晶显示面板仅只需要一个TFT开关，像素的开口率和穿透率提供至少20％。

Description

液晶显示面板的驱动方法及液晶显示面板
技术领域
本发明涉及液晶显示器领域，尤其涉及一种液晶显示面板驱动方法及采用该方法驱动的液晶显示面板。
背景技术
液晶显示器(Liquidcrystaldisplay，LCD)以其轻、薄等优点逐渐成为发展最为迅速的平板显示器之一。但是与阴极射线管显示器相比，薄膜晶体管显示器(ThinFilmTransistor，TFT-LCD)的视角相对较窄，这就为其在对视角要求严格的高端显示领域的应用带来了很大局限，如航空航天、医疗等领域。随着LCD领域广视角技术的迅速发展，目前很多产品的视角已经可以达到水平视角和垂直视角分别为85°/85°，甚至更大的视角。
垂直配向型液晶显示器(VerticalAlignmentLiquidCrystalDisplay,简称VA-LCD)以其宽视野角、高对比度和无须摩擦配向等优势，成为大尺寸TFT-LCD的常用显示器。其缺点是大视角对比度下降和色偏。
为了解决上述缺点，本领域技术人员设计了多种像素结构来实现降低色偏的目的。常见的针对这种大视角下色偏的对策是采用空间法，即将像素单元的ITO区域划分为若干个畴(Domain)，通过设计多个TFT的方式令不同畴之间亮度不同，来达到大视角下低色偏的效果。
图1所为现有技术中具有三个TFT的像素单元的等效电路图。Gn输出高电平时通过TFT1向A区的液晶电容Clc-A、存储电容Cst-A、电荷共享电容Ccs-A和Ccs-B进行充放电，通过TFT2向B区的液晶电容Clc-B和存储电容Cst-B进行充放电，最后达到基本相同的像素电压VpA和VpB。充放电结束后，TFT1和TFT2关断，Gn+1输出高电平，TFT3打开，通过电荷共享电容Ccs-A和Ccs-B的电容耦合分压，在节点C形成的电压就是B区域最后的像素电压VpB。由于像素电压VpA和像素电压VpB的存在压差，使得不同畴之间的亮度不同，因此实现了大视角下低色偏的效果。
然而，上述设计会使得开口率较正常的像素设计有很大的降低，进而引起Cell(压接了PCB和COF的液晶屏)穿透率的降低，导致背光源成本的提高。
因此，克服多畴垂直取向模式的缺点，改善垂直取向液晶显示器大视角对比度下降和色偏的缺点，是本领域亟需解决的问题。
发明内容
本发明所要解决的技术问题是，提供一种液晶显示面板的驱动方法及液晶显示面板，其能够改善垂直取向液晶显示器大视角对比下降和色偏等缺点，使其视角更广。
为了解决上述问题，本发明提供了一种液晶显示面板的驱动方法，包括如下步骤：将一幅画面使用两帧图像显示，两帧图像使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向；将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。
进一步，两帧图像使用极性相同、大小不同的驱动电压驱动。
进一步，两帧图像使用极性不同、大小不同的驱动电压驱动。
本发明还提供一种采用上述的驱动方法驱动的液晶显示面板，包括多个像素单元，每个像素单元包括：一数据线，用于传输数据信号；一扫描线，用于传输扫描信号；一开关，其连接于所述数据线和一像素电极之间，所述开关接收所述扫描线的扫描信号而开启；一存储电容，其连接于所述像素电极和所述公共电极之间；一液晶电容，其一端连接于所述像素电极；若所述开关接收到来自所述扫描线的的开启信号而开启，所述数据线上的数据信号经由所述开关传送至存储电容，存储电容则根据数据信号充电而存储至相应的电位，则所述像素电极具有相对应的电位。
进一步，所述开关包括源极、漏极及栅极，所述数据线与所述源极电连接，所述扫描线与所述栅极电连接，所述像素电极与所述漏极电连接。
进一步，所述液晶电容的另一端连接至一公共电极。
进一步，所述液晶显示面板还包括影像显示区，所述影像显示区包括由多条所述数据线与多条所述扫描线交错配置形成的像素区域，每一所述像素单元设置在所述像素区域内。
进一步，所述液晶显示面板还包括源极驱动器及栅极驱动器，所述源极驱动器通过与其耦接的多条所述数据线将所提供的数据信号传输至影像显示区，所述栅极驱动器通过与其耦接的多条所述扫描线将所提供的扫描信号传输至影像显示区。
本发明的优点在于，将一幅画面使用两帧不同驱动电压驱动的图像叠加显示，使对应像素的液晶分子在不同时间具有两种取向，改善垂直取向液晶显示器大视角对比下降和色偏等缺点，使其视角更广。另外，本发明液晶显示面板仅只需要一个TFT开关，像素的开口率和穿透率提高至少20％。
附图说明
图1是现有技术的垂直配向型液晶显示器具有三个TFT的像素单元的等效电路图；
图2是现有技术的垂直配向型液晶显示器驱动方法示意图；
图3是现有技术的垂直配向型液晶显示器液晶取向示意图；
图4是采用本发明驱动方法驱动的垂直配向型液晶显示器液晶取向示意图；
图5是采用本发明驱动方法驱动的垂直配向型液晶显示器液晶取向的时间平均效果；
图6是本发明驱动方法的一个实施例的示意图；
图7是本发明驱动方法的另一个实施例的示意图；
图8是本发明垂直配向型液晶显示面板的结构示意图；
图9是本发明像素结构示意图；
图10是像素单元的等效电路图。
具体实施方式
下面结合附图对本发明提供的液晶显示面板的驱动方法及液晶显示面板的具体实施方式做详细说明。
参见图2，现有的垂直配向型液晶显示器对一幅画面采用一种电压驱动，每一图像(Figure)采用一帧(Frame)来显示，图2中，采用图像n表示第n幅图像，采用帧n表示第n帧，每一帧中具有若干像素(Pixel)，其中一个像素采用像素M表示。现有的垂直配向型液晶显示器采用一种电压驱动，使得每个像素的液晶分子只有一种取向。参见图3，所有液晶分子具有相同取向偏角α。
而本发明提供一种液晶显示面板的驱动方法，包括如下步骤：
(1)将一幅画面使用两帧图像显示，两帧图像使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向。
(2)将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。
将一幅画面采用两种驱动电压驱动，使得每个像素的液晶分子在不同时间具有两种取向偏角α和β。参见图4，帧2n和帧2n+1均用来显示图像n，参见图5，帧2n和帧2n+1叠加，用于显示图像n，从时间平均效果来看，一幅画面中的每个像素中的液晶分子在不同时间具有两种取向，视角更广。
其中，帧2n和帧2n+1两帧图像使用不同的驱动电压驱动，可采用如下两种方式：
参见图6，一种方式是帧2n和帧2n+1使用极性相同、大小不同的驱动电压驱动，例如，帧2n采用大电压驱动，帧2n+1采用小电压驱动。
参见图7，另一种方式是帧2n和帧2n+1使用极性不同、大小不同的驱动电压驱动，例如，帧2n采用正极性大电压驱动，帧2n+1采用负极性小电压驱动。
本发明还提供一种采用上述的驱动方法驱动的垂直配向型液晶显示面板。参见图8，所述液晶显示面板包括影像显示区100、源极驱动器200以及栅极驱动器300。
所述影像显示区100包括由多条数据线DL(也可称为资料线，如图8所示的N条数据线DL1～DLN)与多条扫描线GL(也可称为闸极线，如图8所示的M条扫描线GL1～GLM)交错配置形成的像素区域110。参见图9，数据线DL和扫描线GL形成了一个像素区域110，在该像素区域110中配置了一个像素单元120。
源极驱动器200通过与其耦接的多条数据线DL将所提供的数据信号传输至影像显示区100中。栅极驱动器300通过与其耦接的多条扫描线GL将所提供的扫描信号传输至影像显示区100中。
图10是所述像素单元120的等效电路图，每个像素单元120包括一数据线DL、一扫描线GL、一开关T、一存储电容Cst及一液晶电容Clc。所述开关T可以为薄膜晶体管。
所述数据线DL与所述源极驱动器200电连接，用于将所述源极驱动器200提供的数据信号传输至影像显示区100中。所述扫描线GL与所述栅极驱动器300电连接，用于将所述栅极驱动器300提供的扫描信号传输至影像显示区100中。
所述开关T连接于所述数据线DL和一像素电极VA之间，所述开关T接收所述扫描线的扫描信号而开启。具体地，所述开关T包括源极(附图中未标示)、漏极(附图中未标示)及栅极(附图中未标示)，所述数据线DL与所述源极电连接，所述扫描线GL与所述栅极电连接，所述像素电极VA与所述漏极电连接。
所述存储电容Cst连接于所述像素电极VA和公共电极Com之间，所述液晶电容Clc一端连接于所述像素电极VA，另一端连接一公共电极CFCom。
若所述开关T接收到来自所述扫描线GL的开启信号而开启，所述数据线DL上的数据信号经由所述开关T传送至存储电容Cst，存储电容Cst则根据数据信号充电而存储至相应的电位，则所述像素电极VA具有相对应的电位，该像素单元120就依据此显示影像数据。
本发明液晶显示面板仅只需要一个开关T，像素的开口率和穿透率提高至少20％。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (8)

1.一种液晶显示面板的驱动方法，其特征在于，包括如下步骤：
将一幅画面使用两帧图像显示，两帧图像使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向；
将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。
2.根据权利要求1所述的液晶显示面板的驱动方法，其特征在于，两帧图像使用极性相同、大小不同的驱动电压驱动。
3.根据权利要求1所述的液晶显示面板的驱动方法，其特征在于，两帧图像使用极性不同、大小不同的驱动电压驱动。
4.一种采用权利要求1～3任意一项权利要求所述的驱动方法驱动的液晶显示面板，其特征在于，包括多个像素单元，每个像素单元包括：
一数据线，用于传输数据信号；
一扫描线，用于传输扫描信号；
一开关，其连接于所述数据线和一像素电极之间，所述开关接收所述扫描线的扫描信号而开启；
一存储电容，其连接于所述像素电极和所述公共电极之间；
一液晶电容，其一端连接于所述像素电极；
若所述开关接收到来自所述扫描线的的开启信号而开启，所述数据线上的数据信号经由所述开关传送至存储电容，存储电容则根据数据信号充电而存储至相应的电位，则所述像素电极具有相对应的电位。
5.根据权利要求4所述的液晶显示面板，其特征在于，所述开关包括源极、漏极及栅极，所述数据线与所述源极电连接，所述扫描线与所述栅极电连接，所述像素电极与所述漏极电连接。
6.根据权利要求4所述的液晶显示面板，其特征在于，所述液晶电容的另一端连接至一公共电极。
7.根据权利要求4所述的液晶显示面板，其特征在于，所述液晶显示面板还包括影像显示区，所述影像显示区包括由多条所述数据线与多条所述扫描线交错配置形成的像素区域，每一所述像素单元设置在所述像素区域内。
8.根据权利要求7所述的液晶显示面板，其特征在于，所述液晶显示面板还包括源极驱动器及栅极驱动器，所述源极驱动器通过与其耦接的多条所述数据线将所提供的数据信号传输至影像显示区，所述栅极驱动器通过与其耦接的多条所述扫描线将所提供的扫描信号传输至影像显示区。
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