CN103777379A - 一种液晶显示屏亮点检测方法 - Google Patents

一种液晶显示屏亮点检测方法 Download PDF

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CN103777379A
CN103777379A CN201210395011.5A CN201210395011A CN103777379A CN 103777379 A CN103777379 A CN 103777379A CN 201210395011 A CN201210395011 A CN 201210395011A CN 103777379 A CN103777379 A CN 103777379A
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voltage
bright spot
liquid crystal
crystal display
data line
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CN103777379B (zh
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单庆增
孙浩
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Beijing BOE Optoelectronics Technology Co Ltd
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Beijing BOE Optoelectronics Technology Co Ltd
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Priority to CN201210395011.5A priority Critical patent/CN103777379B/zh
Priority to US14/055,228 priority patent/US9507187B2/en
Priority to EP13188918.0A priority patent/EP2722838A1/en
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    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2230/00—Details of flat display driving waveforms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本发明公开了一种液晶显示屏亮点检测方法，对栅极施加截止电压，保持薄膜晶体管TFT开关关闭；并且，对数据线施加电压，该电压高于公共电极电压；根据对栅极以及数据线所施加的电压，在黑色画面下检测亮点。本发明实现了黑色画面下的亮点检测。

Description

一种液晶显示屏亮点检测方法
技术领域
本发明涉及液晶显示技术，具体涉及一种液晶显示屏亮点检测方法。
背景技术
目前，针对长黑模式的液晶屏，在液晶屏为黑色画面时无法有效检出亮点。如图1所示，现有的黑色检测画面的信号特点为：对所测试液晶屏的栅极(Gate)施加高电压，使所测试液晶屏的薄膜晶体管(TFT)开关打开，对所测试液晶屏的数据线(Data)施加低电压(等于所测试液晶屏的公共电极(Common)上的电压)，此时液晶屏的画面为黑色。通常，在液晶屏的制造过程中，会出现因微小灰尘导致的如图2所示的像素区异物或膜层残留2，导致像素电极1与数据线4发生短路，从而像素电极1上的电压不受TFT开关控制，电压等于数据线4上的电压，因此显示效果与周围像素不同步，造成显示上的缺陷(通常在灰度画面下表现为亮点)。
但是，由于数据线4电压较低，则像素电极1的电压与周围的其它像素电极的电压差异不明显，导致液晶屏的画面灰度显示无差异，无法有效检出亮点。
发明内容
有鉴于此，本发明的主要目的在于提供一种液晶显示屏亮点检测方法，以实现黑色画面下的亮点检测。
为达到上述目的，本发明的技术方案是这样实现的：
一种液晶显示屏亮点检测方法，该方法包括：
对液晶显示屏栅极施加截止电压，保持薄膜晶体管TFT开关关闭；并且，对数据线施加电压，该电压高于公共电极电压；
根据对栅极以及数据线所施加的电压，在黑色画面下检测亮点。
所述在黑色画面下检测亮点的过程包括：某个像素电极与数据线发生短路，所述像素电极的电压相比周围其它像素电极的电压偏高，导致所述像素电极和公共电极间电场较强，因此液晶发生偏转，该像素相对周围其它像素发亮，形成了黑色画面下的亮点。
所述方法应用于常黑模式液晶显示屏。
上述方案中，所述截止电压为-5V～-15V。
本发明实现了黑色画面下的亮点检测。
附图说明
图1为现有技术的黑色画面信号示意图；
图2为现有技术形成亮点的原理示意图；
图3为本发明实施例的亮点检测流程简图；
图4为本发明实施例的亮点检测原理示意图；
附图标记说明：
1、像素电极；2、像素区异物或膜层残留；3、栅极；4、数据线。
具体实施方式
在实际应用中，对于长黑模式的液晶屏等液晶产品，如高级超维场转换技术(ADvanced Super Dimension Switch，AD-SDS，简称ADS)，ADS的核心技术特性描述为：通过同一平面内狭缝电极边缘所产生的电场以及狭缝电极层与板状电极层间产生的电场形成多维电场，使液晶盒内狭缝电极间、电极正上方所有取向液晶分子都能够产生旋转，从而提高了液晶工作效率并增大了透光效率。可以进行如图3所示的操作，图3所示操作包括以下步骤：
步骤310：对栅极施加截止电压，保持TFT开关关闭；并且，相对于公共电极，对数据线施加高电压。
步骤320：根据对栅极以及数据线所施加的电压，在黑色画面下检测亮点。
具体而言，上述的操作思路可以体现为如图4所示的原理。如，相对于公共电极，可以对数据线施加高电压；并且，对栅极施加截止电压(通常为-5V～-15V，如：-8V)，此时TFT开关关闭。像素电极和公共电极间电场微弱，液晶不发生偏转，因此液晶屏的画面为黑色。若某个像素电极与数据线发生短路，由于数据线相对于公共电极而言具有高电压，因此所述像素电极的电压相比周围其它像素电极的电压偏高，导致所述像素电极和公共电极间电场较强，因此液晶发生偏转，该像素(此处“像素”与“像素电极”分别表示不同的含义。“像素电极”表示像素中的铟锡氧化物(ITO)电极，“像素”表示整个像素，包括像素电极、彩膜等结构)相对周围其它像素发亮，形成了黑色画面下的亮点，因而方便进行在黑色画面下的亮点检测。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。

Claims (4)

1.一种液晶显示屏亮点检测方法，其特征在于，该方法包括：
对液晶显示屏栅极施加截止电压，保持薄膜晶体管TFT开关关闭；并且，对数据线施加电压，该电压高于公共电极电压；
根据对栅极以及数据线所施加的电压，在黑色画面下检测亮点。
2.根据权利要求1所述的方法，其特征在于，所述在黑色画面下检测亮点的过程包括：
某个像素电极与数据线发生短路，所述像素电极的电压相比周围其它像素电极的电压偏高，导致所述像素电极和公共电极间电场较强，因此液晶发生偏转，该像素相对周围其它像素发亮，形成了黑色画面下的亮点。
3.根据权利要求1或2所述的方法，其特征在于，该方法应用于常黑模式液晶显示屏。
4.根据权利要求1所述的方法，其特征在于，所述截止电压为-5V～-15V。
CN201210395011.5A 2012-10-17 2012-10-17 一种液晶显示屏亮点检测方法 Expired - Fee Related CN103777379B (zh)

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US14/055,228 US9507187B2 (en) 2012-10-17 2013-10-16 Method for detecting the bright point in the liquid crystal display panel
EP13188918.0A EP2722838A1 (en) 2012-10-17 2013-10-16 Method for detecting the bright point in the liquid crystal display panel

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CN104464585A (zh) * 2014-10-08 2015-03-25 友达光电股份有限公司 亮点检测方法及显示面板
WO2016078230A1 (zh) * 2014-11-20 2016-05-26 深圳市华星光电技术有限公司 提升不良检出率的像素结构及检测方法
CN108169935A (zh) * 2017-12-19 2018-06-15 武汉华星光电技术有限公司 拦截显示面板的漏电像素的方法及显示面板

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CN104183206B (zh) * 2014-09-10 2017-04-19 南京中电熊猫液晶显示科技有限公司 显示面板的检测方法
CN108847171A (zh) * 2018-06-29 2018-11-20 深圳市菲腾电子科技有限公司 检验tft-cell亮点的方法
CN111025697B (zh) * 2019-12-16 2021-06-01 武汉华星光电技术有限公司 液晶显示面板以及显示装置

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CN108169935A (zh) * 2017-12-19 2018-06-15 武汉华星光电技术有限公司 拦截显示面板的漏电像素的方法及显示面板

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US9507187B2 (en) 2016-11-29
EP2722838A1 (en) 2014-04-23
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US20140104526A1 (en) 2014-04-17

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