CN107991817A - 一种显示面板及其制造方法和控制方法 - Google Patents

一种显示面板及其制造方法和控制方法 Download PDF

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CN107991817A
CN107991817A CN201711230619.1A CN201711230619A CN107991817A CN 107991817 A CN107991817 A CN 107991817A CN 201711230619 A CN201711230619 A CN 201711230619A CN 107991817 A CN107991817 A CN 107991817A
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film transistor
display panel
pixel
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grid
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洪光辉
龚强
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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 CN201711230619.1A priority Critical patent/CN107991817A/zh
Priority to US15/751,945 priority patent/US10747076B2/en
Priority to PCT/CN2018/070019 priority patent/WO2019104822A1/zh
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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
    • 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
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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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    • 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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    • 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
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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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    • 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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Abstract

本发明提供一种显示面板及其制造方法和控制方法，其中，显示面板包括：多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；多个像素电极，所述像素电极位于所述像素区域内；多个第一薄膜晶体管，位于所述像素区域内，所述第一薄膜晶体管的栅极与所述栅极线连接，所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；连接在相邻两像素电极之间的第二薄膜晶体管，所述第二薄膜晶体管在显示面板正常工作时处于非导通状态，在显示面板断电时处于导通状态。本发明通过在显示区一行像素中的相邻像素电极之间增加一个第二薄膜晶体管，改善由于突然断电造成像素中电荷残留而引起的灰阶闪烁等问题，进而改善面板的品质。

Description

一种显示面板及其制造方法和控制方法
技术领域
本发明涉及屏幕显示技术领域，尤其涉及一种显示面板及其制造方法和控制方法。
背景技术
面板的显示（Active Area）区是整个显示面板的有效显示区，其中通常包括栅极Gate线来实现面板逐行扫描，数据Data线来实现给像素提供电位，像素电极来实现面板中液晶的转动以及每个像素中包含控制器件N薄膜晶体管。显示区的像素是通过阵列形成的重复单元，最终实现面板的正常显示。
众所周知，面板中像素是通过反转类型的电荷来驱动液晶转动的，其目的主要是为了防止直流残留等对面板显示以及品质造成影响，常用的两种子像素（Sub Pixel）显示的反转类型是列反转和点反转。请分别参照图1、图2所示，是现在面板中常用的两种SubPixel显示的反转类型，其中包括列反转和点反转，图1是像素列反转的示意图，其中“+”表示这颗像素由正电荷来驱动，“–”表示这颗像素由负电荷来驱动，在列反转模式下，一帧中一列像素为正电荷驱动，其相邻的像素为负电荷驱动；同样地，一列像素为负电荷驱动，其相邻的像素为正电荷驱动。图2是像素点反转的示意图，在点反转模式下，一帧中一颗像素为正电荷驱动，其相邻的像素为负电荷驱动；同样地，一颗像素为负电荷驱动，其相邻的像素为正电荷驱动。
上述显示区像素的设计方案中，如果出现面板突然断电，像素中的电荷没有释放路径，就会出现像素中的电荷残留，图3所示为列反转下断电时的像素中电荷状况示意图，由于是列反转驱动模式，所以面板中相邻两行的像素中残留的电荷不同。如果是点反转驱动模式，则断电时相邻两个像素中残留的电荷不同。由于像素中的残留电荷不一致，当面板再次驱动时会由于像素中残留的电荷不一致造成灰阶闪烁进而影响面板的品质。
发明内容
本发明所要解决的技术问题在于，提供一种显示面板及其制造方法和控制方法，以改善由于突然断电造成像素中电荷残留而引起的灰阶闪烁等问题，进而改善面板的品质。
为了解决上述技术问题，本发明提供一种显示面板，包括：
多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；
多个像素电极，所述像素电极位于所述像素区域内；
多个第一薄膜晶体管，位于所述像素区域内，所述第一薄膜晶体管的栅极与所述栅极线连接，所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；
连接在相邻两像素电极之间的第二薄膜晶体管，所述第二薄膜晶体管在所述显示面板正常工作时处于非导通状态，在所述显示面板断电时处于导通状态。
其中，所述显示面板还包括：
位于相邻两栅极线之间的全局信号线，所述第二薄膜晶体管器栅极连接在所述全局信号线上，所述第二薄膜晶体管的源极和漏极分别与相邻两像素电极相连。
其中，在所述显示面板正常工作时，所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极低电位；在所述显示面板断电时，所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极高电位并维持一段时间。
其中，在所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极高电位并维持一段时间之后，所述显示面板中各像素处于同一个电荷量较低的正电位，或者处于同一个电荷量较低的负电位，或者都处于GND电位。
其中，所述第二薄膜晶体管为N型薄膜晶体管。
本发明还提供一种显示面板的制造方法，包括：
在基板上设置多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；
在所述像素区域内设置多个第一薄膜晶体管和多个像素电极，将所述第一薄膜晶体管的栅极与所述栅极线连接，将所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；
在相邻两像素电极之间的设置第二薄膜晶体管，所述第二薄膜晶体管在所述显示面板正常工作时处于非导通状态，在所述显示面板断电时处于导通状态。
其中，所述制造方法还包括：
在相邻两栅极线之间设置全局信号线，将所述第二薄膜晶体管的栅极连接在所述全局信号线上，将所述第二薄膜晶体管的源极和漏极分别与相邻两像素电极相连。
本发明还提供一种显示面板的控制方法，所述显示面板包括：多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；多个像素电极，所述像素电极位于所述像素区域内；多个第一薄膜晶体管，位于所述像素区域内，所述第一薄膜晶体管的栅极与所述栅极线连接，所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；连接在相邻两像素电极之间的第二薄膜晶体管；
所述控制方法包括：在所述显示面板正常工作时，控制所述第二薄膜晶体管处于非导通状态，在所述显示面板断电时，控制所述第二薄膜晶体管处于导通状态。
其中，所述显示面板还包括位于相邻两栅极线之间的全局信号线，所述第二薄膜晶体管的栅极连接在所述全局信号线上，所述第二薄膜晶体管的源极和漏极分别与相邻两像素电极相连，所述控制方法还包括：
在所述显示面板正常工作时，所述全局信号线在所述第二薄膜晶体管栅极上施加栅极低电位；在所述显示面板断电时，所述全局信号线在所述第二薄膜晶体管栅极上施加栅极高电位并维持一段时间。
其中，在所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极高电位并维持一段时间之后，所述显示面板中各像素处于同一个电荷量较低的正电位，或者处于同一个电荷量较低的负电位，或者都处于GND电位。
本发明实施例的有益效果在于：通过在显示区一行像素中的相邻像素电极之间增加一个第二薄膜晶体管来实现面板在突然断电情况下像素中电荷相互释放，改善由于突然断电造成像素中电荷残留而引起的灰阶闪烁等问题，进而改善面板的品质。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是面板中常用像素显示的列反转示意图。
图2是面板中常用像素显示的点反转示意图。
图3是现有面板的像素列反转下断电时的像素中残留电荷状况示意图。
图4是本发明实施例一一种显示面板的结构示意图。
图5是本发明实施例一的显示面板在断电后各像素的电荷状况示意图。
具体实施方式
以下各实施例的说明是参考附图，用以示例本发明可以用以实施的特定实施例。
请参照图4所示，本发明实施例一提供一种显示面板，包括：
多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；
多个像素电极，所述像素电极位于所述像素区域内；
多个第一薄膜晶体管，位于所述像素区域内，所述第一薄膜晶体管的栅极与所述栅极线连接，所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；
连接在相邻两像素电极之间的第二薄膜晶体管。
进一步地，本实施例的显示面板还包括位于相邻两栅极线之间的全局信号线，所述第二薄膜晶体管的栅极连接在所述全局信号线上，源极和漏极分别与相邻两像素电极相连。
本发明实施例通过在显示区一行像素中的相邻像素电极之间增加一个由全局信号（GAS）控制的第二薄膜晶体管来实现面板在突然断电情况下像素中电荷相互释放，改善由于突然断电造成像素中电荷残留而引起的灰阶闪烁等问题，进而改善面板的品质。
具体地，常用的面板像素驱动方式是列反转和点反转两种模式，这两种驱动模式下，每一行像素中的相邻两个像素之间都是相反电荷驱动的，即一个是正电荷驱动，另一个是负电荷驱动（有三种情况：正电荷量大于负电荷量、正电荷量等于负电荷量、正电荷量小于负电荷量）。本实施例的TFT显示面板具体工作原理是，在面板正常工作时，增加的GAS信号为VGL电位（Voltage Gate Low，栅极低电位），增加的第二薄膜晶体管处于非导通的状态，相邻两像素之间的电位不会相互影响，因此增加的第二薄膜晶体管并不会影响面板的正常显示；当面板突然断电时，通过GAS信号维持一段时间的VGH电位（Voltage Gate High，栅极高电位），这样增加的第二薄膜晶体管处于导通的状态，而且由于相邻两个像素之间都是相反电荷驱动的，因此可以实现正负电荷之间的中和效应，从而保证面板中像素处于同一个电荷量较低的电位，不会出现因电荷残留导致的灰阶闪烁等问题。根据中和效应的结果存在三种情况：像素处于同一个电荷量较低的正电位、像素处于同一个电荷量较低的负电位、像素都处于GND电位。
如图5所示，由于断电前像素中正电荷量大于负电荷量，经过增加的第二薄膜晶体管的控制，在实现正负电荷之间的中和效应后，各像素处于同一个电荷量较低的正电位。相应地，如果断电前像素中正电荷量小于负电荷量，经过增加的第二薄膜晶体管的控制，在实现正负电荷之间的中和效应后，各像素处于同一个电荷量较低的负电位。如果断电前像素中正电荷量等于负电荷量，经过增加的第二薄膜晶体管的控制，在实现正负电荷之间的中和效应后，各像素处于同一个GND电位。
进一步地，本实施例中第一薄膜晶体管和第二薄膜晶体管均为N型薄膜晶体管，该N型薄膜晶体管包括：栅极（Gate）、源极（Source)以及漏极（Drain），其工作原理是当栅极为高电位时，源极和漏极两极是导通的；当Gate为VGL电位时，源极和漏极两极是断开的。由此，增设第二N型薄膜晶体管时，将其栅极连接在全局信号线（GAS）上，源极和漏极分别与横向相邻两像素电极相连，这样，在面板正常工作时，全局信号线给第二N薄膜晶体管的栅极施加的为低电位，此时第二N薄膜晶体管处于非导通的状态，相邻像素之间的电位不会相互影响，因此增加的第二N薄膜晶体管并不会影响面板的正常显示；当面板突然断电时，全局信号线给第二N薄膜晶体管的栅极施加高电位并维持一段时间，此时增加的第二N薄膜晶体管处于导通的状态，而且由于相邻两个像素之间都是相反电荷驱动的，可以实现正负电荷之间的中和效应，从而保证面板中像素处于同一个电荷量较低的电位，不会出现因电荷残留导致的灰阶闪烁等问题。
相应于本发明实施例一，本发明实施例二提供一种显示面板的制造方法，包括：
在基板上设置多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；
在所述像素区域内设置多个第一薄膜晶体管和多个像素电极，将所述第一薄膜晶体管的栅极与所述栅极线连接，将第一薄膜晶体管的源极和漏极分别与所述数据线所述像素电极连接；
在相邻两像素电极之间的设置第二薄膜晶体管，所述第二薄膜晶体管在所述显示面板正常工作时处于非导通状态，在所述显示面板断电时处于导通状态。
其中，所述制造方法还包括：
在相邻两栅极线之间设置全局信号线，将所述第二薄膜晶体管的栅极连接在所述全局信号线上，将所述第二薄膜晶体管的源极和漏极分别与相邻两像素电极相连。
本发明还提供一种显示面板的控制方法，所述显示面板包括：多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；多个像素电极，所述像素电极位于所述像素区域内；多个第一薄膜晶体管，位于所述像素区域内，所述第一薄膜晶体管的栅极与所述栅极线连接，所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；连接在相邻两像素电极之间的第二薄膜晶体管；
所述控制方法包括：在所述显示面板正常工作时，控制所述第二薄膜晶体管处于非导通状态，在所述显示面板断电时，控制所述第二薄膜晶体管处于导通状态。
其中，所述显示面板还包括位于相邻两栅极线之间的全局信号线，所述第二薄膜晶体管的栅极连接在所述全局信号线上，所述第二薄膜晶体管的源极和漏极分别与相邻两像素电极相连，所述控制方法还包括：
在所述显示面板正常工作时，所述全局信号线在所述第二薄膜晶体管栅极上施加栅极低电位；在所述显示面板断电时，所述全局信号线在所述第二薄膜晶体管栅极上施加栅极高电位并维持一段时间。
其中，在所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极高电位并维持一段时间之后，所述显示面板中各像素处于同一个电荷量较低的正电位，或者处于同一个电荷量较低的负电位，或者都处于GND电位。
有关上述实施例二、三的工作原理及有益效果，请参照本发明实施例一的说明，此处不再赘述。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。

Claims (10)

1.一种显示面板，其特征在于，包括：
多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；
多个像素电极，所述像素电极位于所述像素区域内；多个第一薄膜晶体管，位于所述像素区域内，所述第一薄膜晶体管的栅极与所述栅极线连接，所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；
连接在相邻两像素电极之间的第二薄膜晶体管，所述第二薄膜晶体管在所述显示面板正常工作时处于非导通状态，在所述显示面板断电时处于导通状态。
2.根据权利要求1所述的显示面板，其特征在于，还包括：位于相邻两栅极线之间的全局信号线，所述第二薄膜晶体管的栅极连接在所述全局信号线上，源极和漏极分别与相邻两像素电极相连。
3.根据权利要求2所述的显示面板，其特征在于，在所述显示面板正常工作时，所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极低电位；在所述显示面板断电时，所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极高电位并维持一段时间。
4.根据权利要求3所述的显示面板，其特征在于，在所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极高电位并维持一段时间之后，所述显示面板中各像素处于同一个电荷量较低的正电位，或者处于同一个电荷量较低的负电位，或者都处于GND电位。
5.根据权利要求1-4任一项所述的显示面板，其特征在于，所述第二薄膜晶体管为N型薄膜晶体管。
6.一种显示面板的制造方法，其特征在于，包括：
在基板上设置多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；
在所述像素区域内设置多个第一薄膜晶体管和多个像素电极，将所述第一薄膜晶体管的栅极与所述栅极线连接，将所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接
在相邻两像素电极之间设置第二薄膜晶体管，所述第二薄膜晶体管在所述显示面板正常工作时处于非导通状态，在所述显示面板断电时处于导通状态。
7.根据权利要求6所述的制造方法，其特征在于，还包括：
在相邻两栅极线之间设置全局信号线，将所述第二薄膜晶体管的栅极连接在所述全局信号线上，将所述第二薄膜晶体管的源极和漏极分别与相邻两像素电极相连。
8.一种显示面板的控制方法，其特征在于，所述显示面板包括：多条栅极线和多条数据线，所述多条栅极线和多条数据线交叉形成多个像素区域；多个像素电极，所述像素电极位于所述像素区域内；多个第一薄膜晶体管，位于所述像素区域内，所述第一薄膜晶体管的栅极与所述栅极线连接，所述第一薄膜晶体管的源极和漏极分别与所述数据线和所述像素电极连接；连接在相邻两像素电极之间的第二薄膜晶体管；
所述控制方法包括：在所述显示面板正常工作时，控制所述第二薄膜晶体管处于非导通状态，在所述显示面板断电时，控制所述第二薄膜晶体管处于导通状态。
9.根据权利要求8所述的控制方法，其特征在于，所述显示面板还包括位于相邻两栅极线之间的全局信号线，所述第二薄膜晶体管的栅极连接在所述全局信号线上，所述第二薄膜晶体管的源极和漏极分别与相邻两像素电极相连，所述控制方法还包括：
在所述显示面板正常工作时，所述全局信号线在所述第二薄膜晶体管栅极上施加栅极低电位；在所述显示面板断电时，所述全局信号线在所述第二薄膜晶体管栅极上施加栅极高电位并维持一段时间。
10.根据权利要求9所述的控制方法，其特征在于，在所述全局信号线施加在所述第二薄膜晶体管栅极上的电位为栅极高电位并维持一段时间之后，所述显示面板中各像素处于同一个电荷量较低的正电位，或者处于同一个电荷量较低的负电位，或者都处于GND电位。
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