CN104081447A - 液晶显示装置、液晶显示装置的驱动方法 - Google Patents

液晶显示装置、液晶显示装置的驱动方法 Download PDF

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CN104081447A
CN104081447A CN201380007224.9A CN201380007224A CN104081447A CN 104081447 A CN104081447 A CN 104081447A CN 201380007224 A CN201380007224 A CN 201380007224A CN 104081447 A CN104081447 A CN 104081447A
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current potential
signal line
liquid crystal
potential
timing
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CN104081447B (zh
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齐藤浩二
岩本明久
中田淳
植畑正树
西村智彦
尾崎正实
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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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    • 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
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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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    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
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    • 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
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    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
    • H01L27/1225—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
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    • G09G2310/06—Details of flat display driving waveforms
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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
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Abstract

本发明的目的在于在准备切断液晶显示装置的电源而将晶体管导通的情况下，即使随着晶体管从导通到截止而在像素电极中发生电位变动(反冲)也不易对像素施加DC电压。本发明是一种液晶显示装置，其具备数据信号线、扫描信号线、像素电极、与数据信号线和扫描信号线以及像素电极连接的晶体管、共用电极，在断电的顺序中使扫描信号线的电位变动而使晶体管导通，扫描信号线的电位开始变动而在第1定时上升到第1电位为止，在第1定时之后的第2定时向数据信号线输出的电位设定为比在第2定时向共用电极输出的电位高。

Description

液晶显示装置、液晶显示装置的驱动方法
技术领域
本发明涉及液晶显示装置。
背景技术
如果在液晶显示装置的断电时残存于像素电极的电荷对像素(包括像素电极、相对电极以及它们所夹液晶的液晶电容)施加DC电压，则发生残影、闪烁并有损作为液晶显示装置的可靠性。
在专利文献1中公开了在将液晶显示装置的断电的顺序中使晶体管导通而想要使残存于像素电极的电荷放电的技术。
现有技术文献
专利文献
专利文献1：特开2006－011311号公报
发明内容
发明要解决的问题
发明人们发现存在如下问题：即使如专利文献1那样在断电的顺序中使晶体管导通来进行像素电极的放电，在晶体管从导通变为截止(晶体管的栅极电极的电位变动)时，也会由于像素周围的寄生电容而在像素电极中发生电位变动(反冲)，由此对像素(液晶电容)施加DC电压，特别是在晶体管的截止特性良好的液晶显示装置中，(抑制经由晶体管的自然放电，因此)有可能长时间施加该DC电压。
本发明的目的在于在液晶显示装置的断电的顺序中使晶体管导通的情况下，即使随着晶体管从导通到截止而在像素电极中发生电位变动(反冲)，也不易对像素施加DC电压。
用于解决问题的方案
本液晶显示装置具备数据信号线、扫描信号线、像素电极、与数据信号线和扫描信号线以及像素电极连接的晶体管、共用电极，在断电的顺序中使扫描信号线的电位变动而使晶体管导通，上述液晶显示装置的特征在于，扫描信号线的电位开始变动而在第1定时上升到第1电位为止，在第1定时之后的第2定时向数据信号线输出的电位设定为比在第2定时向共用电极输出的电位高。
发明效果
根据本液晶显示装置，在断电时使晶体管导通的情况下，即使随着晶体管从导通到截止而在像素电极中发生反冲，也不易对像素施加DC电压。
附图说明
图1是示出实施方式1的断电顺序的时序图。
图2是示出实施方式1的液晶显示装置的框图。
图3是图2的一部分的等效电路图。
图4是示出实施方式1的断电顺序(包括数据信号线的电位变动)的时序图。
图5是示出实施方式1的断电顺序(包括像素电极的电位变动)的时序图。
图6是示出实施方式1的断电顺序(包括共用电极的电位变动)的时序图。
图7是示出实施方式1的其它方式的时序图。
图8是示出实施方式2的断电顺序的时序图。
图9是示出实施方式2的断电顺序(包括数据信号线的电位变动)的时序图。
图10是示出实施方式2的断电顺序(包括像素电极的电位变动)的时序图。
图11是示出实施方式2的断电顺序(包括共用电极的电位变动)的时序图。
图12是示出实施方式3的断电顺序的时序图。
图13是示出实施方式3的断电顺序(包括数据信号线的电位变动)的时序图。
图14是示出实施方式3的断电顺序(包括像素电极的电位变动)的时序图。
图15是示出实施方式3的断电顺序(包括共用电极的电位变动)的时序图。
图16是示出图13的变形例的时序图。
图17是示出图14的变形例的时序图。
图18是示出图15的变形例的时序图。
图19是示出实施方式3的其它方式的时序图。
图20是示出各实施方式的向各驱动器的供电状态的一例的时序图。
图21是示出各实施方式的向各驱动器的供电状态和扫描信号线电位的关系的一例的时序图。
图22是示出各实施方式的向各驱动器的供电状态和扫描信号线电位的关系的另一例的时序图。
图23是示出氧化物半导体的特性的坐标图。
图24是示出参考例的断电顺序的时序图。
图25是示出参考例的断电顺序(包括数据信号线的电位变动)的时序图。
图26是示出参考例的断电顺序(包括共用电极的电位变动)的时序图。
图27是示出参考例的断电顺序(包括像素电极的电位变动)的时序图。
具体实施方式
如果基于图1～图27说明本发明的实施方式，则如下所示。
〔实施方式1〕
图2是示出本液晶显示装置的构成的框图，图3是图2的一部分的等效电路图。如图2、图3所示，实施方式1的液晶显示装置LCD具备：包括2个基板(未图示)和被该基板夹着的液晶层(未图示)的液晶面板LCP、显示控制电路DCC、源极驱动器SD、栅极驱动器GD、共用电极驱动器CMD、电源电路PWC、电源控制电路PCC。
液晶面板LCP具备：扫描信号线G1～Gn、数据信号线SL、像素电极PE、晶体管(薄膜晶体管、TFT)TR、共用电极COM。晶体管TR的栅极电极与扫描信号线G1连接，源极电极与数据信号线SL连接，漏极电极与像素电极PE连接，如图3所示，像素Pix的像素电极PE和共用电极COM以及液晶层构成像素电容(液晶电容)Clc。此外，在晶体管TR的栅极电极(扫描信号线G1)和晶体管TR的漏极电极(像素电极PE)之间形成有寄生电容Cgd。
源极驱动器SD驱动数据信号线SL(生成向数据信号线SL输出的电位)，栅极驱动器GD驱动扫描信号线G1～Gn，共用电极驱动器CMD驱动共用电极COM(生成向共用电极COM输出的电位)，显示控制电路DCC构成为包括定时控制器、视频处理电路，并对源极驱动器SD、栅极驱动器GD以及共用电极驱动器CMD进行控制。电源控制电路PCC根据来自用户、系统的指示来控制电源电路PWC。电源电路PWC接受电源控制电路PCC的控制后对源极驱动器SD、栅极驱动器GD以及共用电极驱动器CMD提供各种电源电压。
在实施方式1的液晶显示装置中，如图1所示，在时刻Ta有断电的指示的情况下，在时刻Tb将扫描信号线G1～Gn的电位提高而使晶体管TR导通，并且对数据信号线SL输出偏置电位Vos并且对共用电极COM输出接地电位Vgd，在之后的时刻Tg使晶体管TR截止。
在图4～图6中示出图1的详细内容(时刻Tb之后的顺序)。此外，液晶面板LCP是常黑的，晶体管TR的沟道是N型，栅极截止电位VGL＜接地电位Vgd＜负驱动时最低灰度级电位VSL＜偏置电位Vos＜显示中心电位(通常显示时的共用电极的电位)Vcom＜晶体管的阈值电位Vth＜正驱动时最高灰度级电位VSH＜栅极导通电位VGH。
首先，在时刻Tb开始扫描信号线G1的电位的上升并且对数据信号线SL输出偏置电位Vos并且对共用电极COM输出接地电位Vgd。在时刻Td(第1定时)，扫描信号线G1的电位达到比晶体管的阈值电位Vth高的栅极导通电位VGH(第1电位)。
在接下来的时刻Te，栅极脉冲信号的电位(扫描信号线G1的电位)变为下降，在扫描信号线G1的电位成为晶体管的阈值电位Vth的时刻Tg附近晶体管TR截止。
在时刻Tg之后，栅极脉冲信号的电位(扫描信号线G1的电位)从晶体管的阈值电位Vth降低到接地电位Vgd为止。在该期间，晶体管TR截止(晶体管TR的源极电极和像素电极PE之间的电阻值变得非常高)，因此由于寄生电容Cgd，像素电极PE的电位从偏置电位Vos降低到接地电位Vgd为止(反冲，参照图5)。该期间的共用电极COM的电位是接地电位Vgd，因此在此考虑晶体管的阈值电位Vth和像素以及晶体管周围的各种电容(包括寄生电容)等而将偏置电位Vos设定为对接地电位Vgd加上反冲电压(绝对值)所得的电位。
在本实施方式1中，在从时刻Tb到时刻Tg之间，对共用电极COM输出接地电位Vgd并且对数据信号线SL输出偏置电位Vos(＞接地电位Vgd)，由此有如下效果：即使在晶体管TR截止的时刻Tg之后发生像素电极PE的电位变动(反冲)也能将像素电极PE和共用电极COM之间的电位差(对像素Pix施加的DC电压)大体消除。
此外，图24～图27是示出在时刻Tb分别对数据信号线SL和共用电极COM输出了接地电位Vgd的情况的参考图，可知由于像素电极PE的电位变动(反冲)，在晶体管TR截止的时刻Tg之后，在断电后也对像素电极PE和共用电极COM之间(像素Pix)施加DC电压(直到经由晶体管TR的自然放电结束)。特别是在晶体管TR的半导体层采用氧化物半导体(例如包括铟、镓以及锌的氧化物半导体InGaZnOx)的情况下，如后所述，导通/截止特性非常良好且不容易自然放电，因此对像素Pix长时间施加DC电压。换句话说，在晶体管TR的半导体层采用氧化物半导体的情况下，本实施方式1的效果是显著的。
在实施方式1中，如图7所示，还能将从扫描信号线G1的电位上升的时刻Td到时刻TD(比时刻Te靠前的时刻)的期间设为黑显示期间。在黑显示期间，对共用电极COM输出Vcom，另一方面，对数据信号线交替地输出比Vcom靠正极侧的黑显示电位VB和比Vcom靠负极侧的黑显示电位Vb(第5电位)，在黑显示期间结束的时刻Tc，对共用电极COM输出接地电位Vgd并且对数据信号线SL输出偏置电位Vos(＞接地电位Vgd)。
〔实施方式2〕
实施方式2的液晶显示装置的构成如图2所示。在实施方式2的液晶显示装置中，如图8～图11所示，如果首先在时刻Tb使扫描信号线G1的电位从栅极截止电位VGL起上升，并对数据信号线SL输出偏置电位Vou并且对共用电极COM输出显示中心电位Vcom，则在时刻Td数据信号线SL被充电为偏置电位Vou，共用电极COM被充电为显示中心电位Vcom。
在接下来的时刻Te，如果使栅极脉冲信号的电位(扫描信号线G1的电位)从有效电平VGH起下降，在接下来的时刻Tg(第2定时)栅极脉冲信号的电位(扫描信号线G1的电位)低于晶体管的阈值电位Vth，则晶体管TR截止。
在时刻Tg之后，栅极脉冲信号的电位(扫描信号线G1的电位)从晶体管的阈值电位Vth降低到接地电位Vgd为止。在该期间，晶体管TR截止(晶体管TR的源极电极和像素电极PE之间的电阻值变得非常高)，因此像素电极PE的电位由于寄生电容Cgd而从偏置电位Vou降低到显示中心电位Vcom为止(反冲，参照图10)。该期间的共用电极COM的电位是显示中心电位Vcom，因此在此考虑晶体管的阈值电位Vth和像素以及晶体管周围的各种电容(包括寄生电容)等而将偏置电位Vou设定为对接地电位Vgd加上反冲电压(绝对值)所得的电位。
〔实施方式3〕
实施方式3的液晶显示装置的构成如图2所示。在实施方式2的液晶显示装置中，如图12～15所示，首先，在时刻Tb开始扫描信号线G1的电位的上升并且对数据信号线SL输出接地电位Vgd并且对共用电极COM输出负电位Vng。在时刻Td(第1定时)，扫描信号线G1的电位达到比晶体管的阈值电位Vth高的栅极导通电位VGH(第1电位)。
在接下来的时刻Te，栅极脉冲信号的电位(扫描信号线G1的电位)变为下降且在扫描信号线G1的电位成为晶体管的阈值电位Vth的时刻Tg附近晶体管TR截止。
在时刻Tg之后，栅极脉冲信号的电位(扫描信号线G1的电位)从晶体管的阈值电位Vth降低到接地电位Vgd为止。在该期间，晶体管TR截止(晶体管TR的源极电极和像素电极PE之间的电阻值变得非常高)，因此像素电极PE的电位由于寄生电容Cgd而从接地电位Vgd降低到负电位Vng为止(反冲，参照图14)。该期间的共用电极COM的电位是接地电位Vgd，因此在此考虑晶体管的阈值电位Vth和像素以及晶体管周围的各种电容(包括寄生电容)等而将负电位Vng设定为从接地电位Vgd减去反冲电压(绝对值)所得的电位。
在本实施方式3中，在从时刻Tb到时刻Tg之间，对数据信号线SL输出接地电位Vgd并且对共用电极COM输出负电位Vng(＜接地电位Vgd)，由此有如下效果：即使在晶体管TR截止的时刻Tg之后发生像素电极PE的电位变动(反冲)也能将像素电极PE和共用电极COM之间的电位差(对像素Pix施加的DC电压)大体消除。
在实施方式3中，如图16所示，也能将从扫描信号线G1的电位上升的时刻Td到时刻TD(比时刻Te靠前的时刻)设为黑显示期间。在黑显示期间，对共用电极COM输出Vcom。另一方面，对数据信号线交替地输出比Vcom靠正极侧的黑显示电位VB和比Vcom靠负极侧的黑显示电位Vb，在黑显示期间结束的时刻TD，对数据信号线SL输出接地电位Vgd并且对共用电极COM输出负电位Vng。
在从图13到图15中，设为Vng＜Vgd＜VSL＜Vcom＜VSH，但不限于此。例如如图17～图19所示，也能设为VSL＜Vcom＜VNG＜接地电位Vgd＜VSH。这样的话，能省去仅为了断电顺序而生成负电位的工作。
〔关于上述各实施方式〕
在上述各实施方式中，如图20所示，从电源电路PWC向各驱动器D(GD/SD/CMD)的供电在时刻Ta停止，并根据各驱动器D(GD/SD/CMD)的残留电压按时刻Ta～时刻Ti的顺序进行。当然也可以进行从电源电路PWC向各驱动器的供电直到时刻Ti为止。
另外，在上述各实施方式的液晶显示装置中，向各驱动器D(GD/SD/CSD)的供电在时刻Ta停止，因此例如对栅极驱动器提供的电源电位GPW如图21所示被维持着直到时刻Te为止，而在时刻Te之后由于自然放电而降低。此外，在该电源电位GPW在时刻Tb已经降低的情况下，成为图22那样。在图22的情况下，使扫描信号线G1的电位在时刻Td(第1定时)上升到比晶体管的阈值电位Vth高的电位(第1电位、比栅极导通电位VGH低的电位)为止而将晶体管TR导通。
另外，在上述各实施方式的液晶显示装置中，希望将半导体层为所谓的氧化物半导体的TFT用作液晶面板的晶体管。作为该氧化物半导体可以举出例如包括铟、镓以及锌的氧化物半导体(InGaZnOx)。在图23中，示出使用了氧化物半导体的TFT、使用了a－Si(amorphous silicon：非晶硅)的TFT以及使用了LTPS(LowTemperature Poly Silicon：低温多晶硅)的TFT的各自的特性。在图23中，横轴(Vg)是对各TFT提供的栅极电压的值，纵轴(Id)是各TFT的源极－漏极之间的电流值(在图中示为“TFT－on”的期间示出TFT成为导通状态的期间，示为“TFT－off”的期间示出TFT成为截止状态的期间)。如图23所示，使用了氧化物半导体的TFT与使用了a－Si的TFT相比，导通电流值/截止电流值成为1000倍以上，具有非常优异的导通/截止特性。
即，使用了氧化物半导体的TFT的截止状态时的漏电电流是使用了a－Si的TFT的百分之一的程度，几乎不产生漏电电流，截止特性非常优异。另一方面，由于截止特性非常优异，在断电时电荷长时间残留于像素的可能性变高。
本液晶显示装置具备数据信号线、扫描信号线、像素电极、与数据信号线和扫描信号线以及像素电极连接的晶体管、共用电极，在断电的顺序中使扫描信号线的电位变动而使晶体管导通，上述液晶显示装置的特征在于，扫描信号线的电位开始变动而在第1定时上升到第1电位为止，在第1定时之后的第2定时向数据信号线输出的电位设定为比在第2定时向共用电极输出的电位高。
根据上述构成，在断电的顺序中，能在第1定时后使晶体管导通来进行像素电极的放电。并且，在第1定时后的第2定时向数据信号线输出的电位设定为比在第2定时向共用电极输出的电位高，因此即使随着晶体管从导通到截止而在像素电极中发生电位的降低(反冲)，也不易对包括该像素电极的像素施加DC电压。
本液晶显示装置还可以采用如下构成，在第2定时向共用电极输出的电位为第2电位，在第2定时向数据信号线输出的电位为第3电位。
本液晶显示装置还可以采用如下构成，在第2定时向共用电极输出的电位为第4电位，在第2定时向数据信号线输出的电位为第2电位。
本液晶显示装置还可以采用如下构成，上述第1电位为晶体管的阈值电位以上。
本液晶显示装置还可以采用如下构成，上述第2电位为接地电位。
本液晶显示装置还可以采用如下构成，第4电位比接地电位低。
本液晶显示装置还可以采用如下构成，通常显示时的共用电极的电位为第4电位。
本液晶显示装置还可以采用如下构成，在第1定时之后，将向共用电极输出的电位暂时设为第5电位后设为第2电位，并且将向数据信号线输出的电位暂时设为第6电位后设为第3电位。
本液晶显示装置还可以采用如下构成，在第1定时之后，将向共用电极输出的电位暂时设为第5电位后设为第3电位，并且将向数据信号线输出的电位暂时设为第6电位后设为第2电位。
本液晶显示装置还可以采用如下构成，将向共用电极输出的电位设为第5电位，并且从数据信号线对上述像素电极写入上述第6电位，由此使包括该像素电极的像素成为黑显示。
本液晶显示装置还可以采用如下构成，具备：生成向数据信号线输出的电位的数据信号线驱动电路；生成向共用电极输出的电位的共用电极驱动电路；以及对数据信号线驱动电路和共用电极驱动电路进行控制的控制电路。
本液晶显示装置还可以采用如下构成，上述晶体管的半导体层采用氧化物半导体。
本液晶显示装置还可以采用如下构成，上述氧化物半导体包括铟、镓以及锌。
本液晶显示装置的驱动方法是针对液晶显示装置在断电的顺序中使扫描信号线的电位变动而使晶体管导通，上述液晶显示装置具备数据信号线、扫描信号线、像素电极、与数据信号线和扫描信号线以及像素电极连接的晶体管、共用电极，上述液晶显示装置的驱动方法的特征在于，扫描信号线的电位开始变动而在第1定时上升到第1电位为止，将在第1定时之后的第2定时向数据信号线输出的电位设定为比在第2定时向共用电极输出的电位高。
本发明不限于上述实施方式，将上述实施方式基于技术常识适当变更后的内容或将其组合后得到的内容也包括在本发明的实施方式中。
工业上的可利用性
本发明的液晶显示装置对例如各种液晶显示器、液晶电视是优选的。
附图标记说明
LCD     液晶显示装置
TR      晶体管
COM     共用电极
SL      数据信号线
G1～Gn  扫描信号线
CMD     共用电极驱动器
SD      源极驱动器
GD      栅极驱动器
AM      有源矩阵基板
LCP     液晶面板
PE    像素电极
DCC   显示控制电路
PWC   电源电路

Claims (14)

1.一种液晶显示装置，具备数据信号线、扫描信号线、像素电极、与数据信号线和扫描信号线以及像素电极连接的晶体管、共用电极，在断电的顺序中使扫描信号线的电位变动而使晶体管导通，其特征在于，
扫描信号线的电位开始变动而在第1定时上升到第1电位为止，
在第1定时之后的第2定时向数据信号线输出的电位设定为比在第2定时向共用电极输出的电位高。
2.根据权利要求1所述的液晶显示装置，其特征在于，
在第2定时向共用电极输出的电位为第2电位，在第2定时向数据信号线输出的电位为第3电位。
3.根据权利要求1所述的液晶显示装置，其特征在于，
在第2定时向共用电极输出的电位为第4电位，在第2定时向数据信号线输出的电位为第2电位。
4.根据权利要求1所述的液晶显示装置，其特征在于，
上述第1电位为晶体管的阈值电位以上。
5.根据权利要求2或3所述的液晶显示装置，其特征在于，
上述第2电位为接地电位。
6.根据权利要求3所述的液晶显示装置，其特征在于，
第4电位比接地电位低。
7.根据权利要求6所述的液晶显示装置，其特征在于，
通常显示时的共用电极的电位为第4电位。
8.根据权利要求2所述的液晶显示装置，其特征在于，
在第1定时之后，将向共用电极输出的电位暂时设为第5电位后设为第2电位，并且将向数据信号线输出的电位暂时设为第6电位后设为第3电位。
9.根据权利要求3所述的液晶显示装置，其特征在于，
在第1定时之后，将向共用电极输出的电位暂时设为第5电位后设为第3电位，并且将向数据信号线输出的电位暂时设为第6电位后设为第2电位。
10.根据权利要求8或9所述的液晶显示装置，其特征在于，
将向共用电极输出的电位设为第5电位，并且从数据信号线对上述像素电极写入上述第6电位，由此使包括该像素电极的像素成为黑显示。
11.根据权利要求1所述的液晶显示装置，其特征在于，
具备：生成向数据信号线输出的电位的数据信号线驱动电路；生成向共用电极输出的电位的共用电极驱动电路；以及对数据信号线驱动电路和共用电极驱动电路进行控制的控制电路。
12.根据权利要求1～11中的任一项所述的液晶显示装置，其特征在于，
上述晶体管的半导体层采用氧化物半导体。
13.根据权利要求12所述的液晶显示装置，其特征在于，
上述氧化物半导体包括铟、镓以及锌。
14.一种液晶显示装置的驱动方法，
针对液晶显示装置在断电的顺序中使扫描信号线的电位变动而使晶体管导通，上述液晶显示装置具备数据信号线、扫描信号线、像素电极、与数据信号线和扫描信号线以及像素电极连接的晶体管、共用电极，上述液晶显示装置的驱动方法的特征在于，
扫描信号线的电位开始变动而在第1定时上升到第1电位为止，
将在第1定时之后的第2定时向数据信号线输出的电位设定为比在第2定时向共用电极输出的电位高。
CN201380007224.9A 2012-01-31 2013-01-28 液晶显示装置、液晶显示装置的驱动方法 Expired - Fee Related CN104081447B (zh)

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