CN106097997A - In‑Cell触控显示面板的驱动方法及驱动电路 - Google Patents

In‑Cell触控显示面板的驱动方法及驱动电路 Download PDF

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CN106097997A
CN106097997A CN201610424983.0A CN201610424983A CN106097997A CN 106097997 A CN106097997 A CN 106097997A CN 201610424983 A CN201610424983 A CN 201610424983A CN 106097997 A CN106097997 A CN 106097997A
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goa
goa unit
display panel
control display
circuit
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邢振周
陈伟
乔春宁
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to CN201610424983.0A priority Critical patent/CN106097997A/zh
Priority to US15/119,728 priority patent/US10276118B2/en
Priority to PCT/CN2016/090111 priority patent/WO2017215068A1/zh
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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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    • 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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    • 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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    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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Abstract

本发明涉及一种In‑Cell触控显示面板的驱动方法及驱动电路。该In‑Cell触控显示面板的驱动方法包括：步骤10、提供GOA电路，该GOA电路包括级联的多个GOA单元；步骤20、按照预设时序，控制第n级GOA单元对该触控显示面板的第n级水平扫描线充电；步骤30、按照预设时序，将所述多个GOA单元划分为执行完触控扫描后用于扫描接下来的第一行水平扫描线对应的第一类GOA单元，以及该第一类GOA单元以外的第二类GOA单元；步骤40、该第一类GOA单元的电路尺寸大于该第二类GOA单元的电路尺寸，以使该第一类GOA单元对水平扫描线的推力大于该第二类GOA单元。本发明还提供了相应的驱动电路。本发明In‑Cell触控显示面板的驱动方法及驱动电路可以改善In‑Cell触控显示面板显示不均匀现象。

Description

In-Cell触控显示面板的驱动方法及驱动电路
技术领域
本发明涉及液晶显示技术领域，尤其涉及一种In-Cell触控显示面板的驱动方法及驱动电路。
背景技术
随着显示技术的迅速发展，触摸屏(Touch Screen Panel)已经逐渐遍及人们的生活中。目前，触摸屏按照组成结构可以分为：外挂式触摸屏(Add on Mode Touch Panel)、以及内嵌式触摸屏(In Cell Touch Panel)。其中，外挂式触摸屏是将触摸屏与液晶显示屏(Liquid Crystal Display，LCD)分开生产，然后贴合到一起成为具有触摸功能的液晶显示屏，但其存在光透过率较低、模组较厚等缺点。而内嵌式触摸屏将触摸屏的触控电极内嵌在液晶显示屏内部，可以减薄模组整体的厚度，提升光透过率，因此受到各大面板厂家青睐。
参见图1，其为现有技术中一种触控显示面板的感应垫架构示意图。公共电压(VCOM)ITO(氧化铟锡)层对应于传感器阵列(Sensor Array)分割成一个个的ITO垫(ITOPad)1作为触控感应的感应垫(Sensor Pad)，并且连接至触控显示控制电路2。
液晶面板的工作原理简单来说是在两片平行的玻璃基板当中放置液晶分子，并在两片玻璃基板上施加驱动电压来控制液晶分子的旋转方向，以将背光模组的光线折射出来产生画面。主动式液晶显示面板中每个像素具有一个薄膜晶体管(TFT)，其栅极(Gate)连接至水平扫描线(Gate line)，漏极(Drain)连接至垂直方向的数据线，源极(Source)则连接至像素电极。在水平扫描线上施加足够的电压，会使得该条线上的所有TFT打开，此时该水平扫描线上的像素电极会与垂直方向的数据线连接，从而将数据线上的显示信号电压写入像素，控制不同液晶的透光度进而达到控制色彩的效果。目前主要采用将水平扫描线的驱动电路制作在显示区周围的基板上的GOA(阵列基板行驱动)电路来完成水平扫描线的驱动。
简单来说，GOA电路通常包括级联的多个GOA单元，每一级GOA单元对应驱动一级水平扫描线。GOA单元的主要结构包括上拉电路，上拉控制电路，下传电路，下拉电路和下拉维持电路，以及负责电位抬升的自举电容。上拉电路主要负责将时钟信号输出为栅极(Gate)信号；上拉控制电路负责控制上拉电路的打开时间，一般连接前面级GOA电路传递过来的下传信号或者Gate信号；下拉电路负责在第一时间将Gate拉低为低电位，即关闭Gate信号；下拉维持电路则负责将Gate输出信号和上拉电路的Gate信号(通常称为Q点)维持在关闭状态(即负电位)，通常有两个下拉维持模块交替作用；自举电容则负责Q点的二次抬升，这样有利于上拉电路的输出。
目前对于In-Cell(触控电极内嵌在液晶盒内)触控显示面板多采用Display(显示)与TP(触控)分时驱动的扫描方式：即Gate每扫描N行，就停下来扫一部分TP，然后Gate接着再扫N行，再扫一部分TP……如此反复，直到一帧显示完毕。这样做的好处是显示和TP的相互干扰较小。如图2所示，其为一种现有In-Cell触控显示面板的GOA时序(timing)示意图。In-Cell触控显示面板显示时可分划分为多个Display term(显示期)和TP term(触控期)，如图2所示，当In-Cell触控显示面板在打开TP功能后，VGL无法关闭Gate TFT且TPterm因全驱使MUX TFT开启(此时GOA信号为关闭状态)，导致Pixel(像素)上电位通过Source line(源极线)漏电。
如图3所示，其为一种现有In-Cell触控显示面板开启TP功能后像素上电位通过源极线放电示意图。当Display停下来扫TP的这段时间内，Gate会一直维持在VGL(低电压)的状态，Source就会一直维持在0V(接地)的状态，这样时间长了就会引起漏电(如虚线箭头所示)。
如图4所示，其为一种现有In-Cell触控显示面板显示不均匀示意图。按照时序，假设首先在Display term扫描第1至第N行gate，然后停下来进行TP扫描，但是TP扫描期间会发生漏电，因此待TP扫描完毕后，在接下来的Display term扫第N+1行的Gate时，第N+1行的Gate信号推力不足就会导致第N+1行的像素没办法充饱，在显示上就表现为第N+1的亮度偏暗，也就是说每次TP term打开的那一行的亮度会由于漏电而变得偏暗，从而造成显示不均匀。
发明内容
因此，本发明的目的在于提供一种In-Cell触控显示面板的驱动方法，改善In-Cell触控显示面板显示不均匀现象。
本发明的另一目的在于提供一种In-Cell触控显示面板的驱动电路，改善In-Cell触控显示面板显示不均匀现象。
为实现上述目的，本发明提供一种In-Cell触控显示面板的驱动方法，包括：
步骤10、提供GOA电路，该GOA电路包括级联的多个GOA单元；
步骤20、按照预设时序，控制第n级GOA单元对该触控显示面板的第n级水平扫描线充电；
步骤30、按照预设时序，将所述多个GOA单元划分为执行完触控扫描后用于扫描接下来的第一行水平扫描线对应的第一类GOA单元，以及该第一类GOA单元以外的第二类GOA单元；
步骤40、该第一类GOA单元的电路尺寸大于该第二类GOA单元的电路尺寸，以使该第一类GOA单元对水平扫描线的推力大于该第二类GOA单元。
其中，该GOA电路为CMOS GOA电路。
其中，该第一类GOA单元的电路相较于该第二类GOA单元在输出端多出至少一反向器。
其中，该反向器包括一PMOS和一NMOS，该PMOS和NMOS栅极相连为输入端，该PMOS源极接高电位，该NMOS源极接低电位，该PMOS和NMOS的漏极相连为输出端。
其中，该触控显示面板为Hybrid In-Cell触控显示面板或Full In-Cell触控显示面板。
为实现上述目的，本发明还提供了一种In-Cell触控显示面板的驱动电路，包括：一GOA电路，该GOA电路包括级联的多个GOA单元；按照预设时序控制第n级GOA单元对该触控显示面板的第n级水平扫描线充电；按照预设时序，将所述多个GOA单元划分为执行完触控扫描后用于扫描接下来的第一行水平扫描线对应的第一类GOA单元，以及该第一类GOA单元以外的第二类GOA单元；其中，该第一类GOA单元的电路尺寸大于该第二类GOA单元的电路尺寸，以使该第一类GOA单元对水平扫描线的推力大于该第二类GOA单元。
其中，该GOA电路为CMOS GOA电路。
其中，该第一类GOA单元的电路相较于该第二类GOA单元在输出端多出至少一反向器。
其中，该反向器包括一PMOS和一NMOS，该PMOS和NMOS栅极相连为输入端，该PMOS源极接高电位，该NMOS源极接低电位，该PMOS和NMOS的漏极相连为输出端。
其中，该触控显示面板为Hybrid In-Cell触控显示面板或Full In-Cell触控显示面板。
综上所述，本发明In-Cell触控显示面板的驱动方法及驱动电路可以改善In-Cell触控显示面板显示不均匀现象。
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为现有技术中一种In-Cell触控显示面板的感应垫架构示意图；
图2为一种现有In-Cell触控显示面板的GOA时序示意图；
图3为一种现有In-Cell触控显示面板开启TP功能后像素上电位通过源极线放电示意图；
图4为一种现有In-Cell触控显示面板显示不均匀示意图；
图5为GOA尺寸与充电率关系示意图；
图6为GOA尺寸增大前后与显示的示意图；
图7为本发明In-Cell触控显示面板的驱动电路一较佳实施例的电路示意图；
图8为本发明In-Cell触控显示面板的驱动方法的流程图。
具体实施方式
参见图5，其为GOA尺寸与充电率关系示意图，可见GOA size(尺寸)与充电率之间的关系，充电率随GOA size增大而增加。本发明提出的做法为在In-Cell触控显示面板出现显示异常的那一行增大GOA size，增强推力，使该行充入更多的电荷，即使用多充入的电荷抵消因漏电而损失的电荷。
参见图6，其为GOA尺寸增大前后与显示的示意图。图6中以三角形大小表示GOAsize，将因开启TP term而造成显示异常的行的GOA size增大；通过图6中横向比较可知，GOA size的增大会提高pixel的充电率，使在相同的时间内充入更多的电荷量，从而弥补每次TP term开启时Pixel上电位通过Source line漏电而造成显示异常的现象。
参见图7，其为本发明In-Cell触控显示面板的驱动电路一较佳实施例的电路示意图。本发明主要针对采用分时驱动的In-Cell触控显示面板设计，因此可适用于诸如HybridIn-Cell(触控电极在液晶盒内的混合内嵌型)触控显示面板和Full In-Cell(触控电极在液晶盒内的全面内嵌型)触控显示面板。
本发明的In-Cell触控显示面板的驱动电路主要包括：一GOA电路，该GOA电路包括级联的多个GOA单元；按照预设时序控制第n级GOA单元对该触控显示面板的第n级水平扫描线充电；按照预设时序，将所述多个GOA单元划分为执行完触控扫描后用于扫描接下来的第一行水平扫描线对应的第一类GOA单元，以及该第一类GOA单元以外的第二类GOA单元；其中，该第一类GOA单元的电路尺寸大于该第二类GOA单元的电路尺寸，以使该第一类GOA单元对水平扫描线的推力大于该第二类GOA单元。其中，预设时序即为触控显示的分时驱动时序。
图7中以CMOS GOA电路为例来说明本发明，并且仅绘出了具有增大尺寸设计的GOA单元，其中虚线标示的部分即表示尺寸增大的部分。因为本发明重点在于将因开启TP term而造成显示异常的行的GOA size增大，而不在于GOA本身的结构，本领域技术人员可以理解本发明可以适用于各类现有GOA电路结构。图7中对GOA单元尺寸增大所做出的具体设计是使第一类GOA单元的电路相较于该第二类GOA单元在输出端多出至少一反向器，这样的电路设计较为简单且易实现。该反向器包括一PMOS和一NMOS，该PMOS和NMOS栅极相连为输入端Input，该PMOS源极接高电位VGH，该NMOS源极接低电位VGL，该PMOS和NMOS的漏极相连为输出端Output。
参见图8，其为本发明In-Cell触控显示面板的驱动方法的流程图。该方法主要包括：
步骤10、提供GOA电路，该GOA电路包括级联的多个GOA单元；
步骤20、按照预设时序，控制第n级GOA单元对该触控显示面板的第n级水平扫描线充电；
步骤30、按照预设时序，将所述多个GOA单元划分为执行完触控扫描后用于扫描接下来的第一行水平扫描线对应的第一类GOA单元，以及该第一类GOA单元以外的第二类GOA单元；
步骤40、该第一类GOA单元的电路尺寸大于该第二类GOA单元的电路尺寸，以使该第一类GOA单元对水平扫描线的推力大于该第二类GOA单元。
综上所述，本发明In-Cell触控显示面板的驱动方法及驱动电路可以改善In-Cell触控显示面板显示不均匀现象。
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In-Cell触控显示面板的驱动方法，其特征在于，包括：
步骤10、提供GOA电路，该GOA电路包括级联的多个GOA单元；
步骤20、按照预设时序，控制第n级GOA单元对该触控显示面板的第n级水平扫描线充电；
步骤30、按照预设时序，将所述多个GOA单元划分为执行完触控扫描后用于扫描接下来的第一行水平扫描线对应的第一类GOA单元，以及该第一类GOA单元以外的第二类GOA单元；
步骤40、该第一类GOA单元的电路尺寸大于该第二类GOA单元的电路尺寸，以使该第一类GOA单元对水平扫描线的推力大于该第二类GOA单元。
2.如权利要求1所述的In-Cell触控显示面板的驱动方法，其特征在于，该GOA电路为CMOS GOA电路。
3.如权利要求1所述的In-Cell触控显示面板的驱动方法，其特征在于，该第一类GOA单元的电路相较于该第二类GOA单元在输出端多出至少一反向器。
4.如权利要求3所述的In-Cell触控显示面板的驱动方法，其特征在于，该反向器包括一PMOS和一NMOS，该PMOS和NMOS栅极相连为输入端，该PMOS源极接高电位，该NMOS源极接低电位，该PMOS和NMOS的漏极相连为输出端。
5.如权利要求1所述的In-Cell触控显示面板的驱动方法，其特征在于，该触控显示面板为Hybrid In-Cell触控显示面板或Full In-Cell触控显示面板。
6.一种In-Cell触控显示面板的驱动电路，其特征在于，包括：一GOA电路，该GOA电路包括级联的多个GOA单元；按照预设时序控制第n级GOA单元对该触控显示面板的第n级水平扫描线充电；按照预设时序，将所述多个GOA单元划分为执行完触控扫描后用于扫描接下来的第一行水平扫描线对应的第一类GOA单元，以及该第一类GOA单元以外的第二类GOA单元；其中，该第一类GOA单元的电路尺寸大于该第二类GOA单元的电路尺寸，以使该第一类GOA单元对水平扫描线的推力大于该第二类GOA单元。
7.如权利要求6所述的In-Cell触控显示面板的驱动电路，其特征在于，该GOA电路为CMOS GOA电路。
8.如权利要求6所述的In-Cell触控显示面板的驱动电路，其特征在于，该第一类GOA单元的电路相较于该第二类GOA单元在输出端多出至少一反向器。
9.如权利要求8所述的In-Cell触控显示面板的驱动电路，其特征在于，该反向器包括一PMOS和一NMOS，该PMOS和NMOS栅极相连为输入端，该PMOS源极接高电位，该NMOS源极接低电位，该PMOS和NMOS的漏极相连为输出端。
10.如权利要求6所述的In-Cell触控显示面板的驱动电路，其特征在于，该触控显示面板为Hybrid In-Cell触控显示面板或Full In-Cell触控显示面板。
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