CN100336089C - 液晶显示装置 - Google Patents

液晶显示装置 Download PDF

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CN100336089C
CN100336089C CNB2003101202750A CN200310120275A CN100336089C CN 100336089 C CN100336089 C CN 100336089C CN B2003101202750 A CNB2003101202750 A CN B2003101202750A CN 200310120275 A CN200310120275 A CN 200310120275A CN 100336089 C CN100336089 C CN 100336089C
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driving circuit
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signal
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CN1506926A (zh
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鹫尾一
前田和宏
恩田卫
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Sharp Corp
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3685Details of drivers for data electrodes
    • G09G3/3688Details of drivers for data electrodes suitable for active matrices only
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0421Structural details of the set of electrodes
    • G09G2300/043Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243Details of the generation of driving signals
    • G09G2310/0248Precharge or discharge of column electrodes before or after applying exact column voltages
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0223Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3607Control 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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3674Details of drivers for scan electrodes
    • G09G3/3677Details of drivers for scan electrodes suitable for active matrices only

Abstract

这种在驱动电路中输入互相相关的多个信号,其中的至少1个信号也共同输入到其它电路的构成中,不对导致电耗增加的信号本身实施加工,来抑制基于相关信号间配线负荷的不同的相位关系偏差。第1及第2时钟信号被输入到第1数据信号线驱动电路。其中的第1时钟信号也共同输入到第2数据信号线驱动电路。为使基于配线1与配线2之间的敷设差异的配线负荷相一致,在配线2中设有虚配线,由虚配线与液晶层及对置电极来形成附加电容部。

Description

液晶显示装置
技术领域
本发明涉及适用于有源矩阵型液晶显示装置等具有驱动多个扫描信号线的扫描信号线驱动电路、驱动与上述扫描信号线交叉配置的多个数据信号线的数据信号线驱动电路的显示装置。
背景技术
以往,作为显示装置之一,有源矩阵驱动方式的液晶显示装置已为人知。在本说明书中,作为系本发明的对象技术的显示装置示例,对液晶显示装置作以记述,但本发明并非限定于此,对其它显示装置也有效。
有源矩阵型液晶显示装置如图10所示,具有像素阵ARY、扫描信号线驱动电路GD、数据信号线驱动电路SD。
像素阵ARY具有互相交叉的多个扫描信号线GL(1)~GL(j)及数据信号线SL(1)~SL(i),在由邻接的2个扫描信号线GL·GL(以下在总称时及任意所指时,表示为参照符号GL)以及邻接的2个数据信号线SL·SL(以下在总称时及任意所指时,表示为参照符号SL)划分的每个部分中,各配备1个像素PIX。像素PIX...配置为矩阵状。
数据信号线驱动电路SD主要由移位寄存器与取样电路来组成,由未图示的外部电路,与视频信号VIDEO一起,输入作为控制信号的起动脉冲信号SSP及时钟信号SCK。数据信号线驱动电路SD在输入了起动脉冲信号SSP的脉冲后,与时钟信号SCK的定时信号同步,对所输入的视频信号VIDEO进行取样,根据需要进行放大,并写入数据信号线SL(1)~SL(i)。
扫描信号线驱动电路GD主要由移位寄存器来组成,由未图示的外部电路,输入作为控制信号的起动脉冲信号GSP及时钟信号GCK。扫描信号线驱动电路GD在输入了起动脉冲信号GSP的脉冲后,与时钟信号GCK的定时信号同步,来依次选择并驱动扫描信号线GL(1)~GL(j)。由此来控制处于像素PIX内的后述转换元件的开闭,将写入数据信号线SL的视频信号(数据)写入像素PIX,同时保持写入像素PIX的数据。
因此,本发明申请人提出一种技术,即,在这种显示装置中,由多个驱动电路来构成上述数据信号线驱动电路SD及扫描信号线驱动电路GD中的至少任意一方的驱动电路,互相独立或连动来对像素阵驱动多个驱动电路(比如参照日本国公开公报,即特开2002-32048号公报(2002年1月31日公开)(对应于美国公开公报,即NO.US2002/0075249A1))。
其中,根据所输入的视频种类及使用环境,通过适宜切换驱动像素阵的驱动电路,可以进行最佳显示格式下的显示,还可实现节电。
比如,在由1个显示装置来实现黑白显示与彩色显示中,通过由彩色显示用驱动电路来处理黑白数据,可以进行黑白显示。然而,尽管是黑白显示,但驱动电路将耗费与彩色显示同等的电力,其结果是,进行黑白显示的优点将不复存在。因此,通过采用设置多个驱动电路的构成,以使黑白显示用驱动电路不同于彩色显示用驱动电路来搭载,可以抑制黑白显示中的电耗。
此外,通过利用多个驱动电路并附加时间差,来将视频信号写入数据信号线,可以改写图像,因而可不在外部对视频信号进行信号处理来进行叠加显示。
如上所述,在本发明申请人已提出的技术中,使数据信号线驱动电路或扫描信号线驱动电路成为一种互相独立或连动来驱动的多个构成。
不过,在这种构成中,所考虑的是一种比如在所具备的多个驱动电路的某个驱动电路中,使用2个系统时钟信号,而在其它驱动电路中,只使用其中的1个系统时钟信号的构成。
更具体地说,是一种下述构成:比如设置为2个数据信号线驱动电路在数据信号线两侧,通过数据信号线来互相连接,其中,一方数据信号线驱动电路具备2个系列移位寄存器,与各移位寄存器对应来使用2个系统的时钟信号,而另一方的数据信号线驱动电路只具备1个系列移位寄存器,只使用2个系统时钟信号中的一方。
在该场合下,从简化外部接口的构成出发,由2个数据信号线驱动电路共用的时钟信号被共同输入到2个数据信号线驱动电路,但在这里,在使用2个系统时钟信号的数据信号线驱动电路中,将发生视频信号的取样定时出现偏差,图像质量下降的问题。
这是因为由于提供2个系统时钟信号的配线的敷设不同而引起配线负荷的不同。即如图11所示,与设置于信号输入部103侧的第1数据信号线驱动电路SD1一起,也共同输入到设置于信号输入部103侧的相反侧端边的第2数据信号线驱动电路SD2的第1时钟信号ck1的配线100的配线长度长于只输入到第1数据信号线驱动电路SD1的第2时钟信号ck2的配线101。因此,其配线负荷当然增大,而且配线100与配线101中,其配线负荷将相异。
如果在这种配线负荷相异的配线100·101中,比如图12所示,输入互相具有反相关系的第1及第2各时钟信号ck1·ck2,则提供给配线负荷大的配线100的第1时钟信号ck1将迟于第2时钟信号ck2。其结果是,即使处于比如相对信号输入侧103几乎相等的距离位置,提供给配线100的第1时钟信号ck1及提供给配线101的第2时钟信号ck2中,其相位关系也会发生偏差。在数据信号线驱动电路SD1的场合下,这种时钟信号间的相位偏差将显现为视频信号的取样定时偏差。
另一方面,还考虑了以下方法,即:通过考虑因配线100与配线101的配线负荷差异而发生的第1及第2时钟信号ck1·ck2之间的上述相位差,来作成第1及第2时钟信号ck1·ck2的外部电路,来对各时钟信号ck1·ck2进行预校正,以消除该相位差。
然而,如果假设该校正值时间比如为25ns,则需要20Mhz以上的外部电路源时钟(系统时钟),从而增大了电耗。近年来,这种显示装置被用作移动设备的显示装置的事例日渐增多,从低电耗的观点出发,有减少源时钟的倾向。因此,难以采用由外部电路来进行这种相位差的校正的方法。
此外,在显示装置是上述液晶显示装置的场合下,配线负荷在很大程度上取决于由该配线、对置电极以及作为裹夹于其间的电介体的液晶层来构成的电容。因此,液晶层中所采用的液晶材料及液晶层的厚度也会引起变化,为通过外部电路来进行对应处理,有必要按每个显示面板来调整校正量,无疑会增加成本。
发明内容
本发明鉴于上述课题,其目的在于提供一种显示装置:即,在多个系统的时钟信号等互相关联的多个信号被输入到驱动电路的场合下,即使为简化外部接口的构造,一部分被单独输入,另一部分被与其它电路共同输入,即在相关联的多个信号之间通过不同的配线敷设来输入,也不增大电耗,不受基于敷设差异的影响,可进行良好的显示。
本发明的显示装置的特征在于:为解决上述课题,具有驱动扫描信号线的扫描信号线驱动电路;驱动与上述扫描信号线交叉配置的数据信号线的数据信号线驱动电路,此外构成为在上述扫描信号线驱动电路或数据信号线驱动电路的至少一方的驱动电路中,至少输入第1、第2信号,在其它电路,共同输入第1信号,设有配线负荷调整单元,其使输入到上述驱动电路的第2信号的配线负荷与共同输入到上述其它电路的第1信号的配线负荷相一致。
作为上述其它电路,有驱动上述扫描信号线或数据信号线的驱动电路等。此外上述第1、第2信号是多个系统的时钟信号及由多个位来构成的数字视频信号,有至少分为2个位组的数字视频信号等。
比如,考虑了一种在设置为2个数据信号线驱动电路在数据信号线的两侧通过数据信号线来互相连接的构成中,一方的数据信号线驱动电路使用2个系统时钟信号,另一方的数据信号线驱动电路只使用其中的1个系统时钟信号的构成。
在这种场合下,为简化外部接口的构成,由2个数据信号线驱动电路共用的第1时钟信号大多被共同输入到2个数据信号线驱动电路。然而,如果像这样共同输入由2个数据信号线驱动电路使用的第1时钟信号,则在共同使用第1时钟信号(第1信号)与单独输入的第2时钟信号(第2信号)的数据信号线驱动电路中,由于第1及第2时钟信号中的配线负荷的不同,将发生信号延迟量的差异。发生这种信号延迟量差异后,在第1及第2时钟信号之间,其相位关系将偏离信号设计时的最佳关系,因而在数据信号线驱动电路的场合下,将作为视频信号的取样定时偏差而显现出来,造成画面质量下降。
此外,虽然也可以通过考虑因配线负荷差异而发生的第1及第2时钟信号之间的上述相位差来作成这些时钟信号的外部电路,来对第1及第2时钟信号进行预校正,以消除该相位差,但如上所述,外部电路源时钟(系统时钟)有必要达到极高的频率,因而其电耗将上扬。在用作移动设备的显示装置的场合下,电耗增加是一个严重的问题。
为此在本发明中,如上所述,设有配线负荷调整单元,其使也共同输入到其它电路的第1信号的配线负荷与单独输入到驱动电路的第2信号的配线负荷相一致。
这样,可以不采用在外部电路对第1及第2时钟信号实施校正,从而致使电耗增加的方法,来使只单独输入到数据信号线驱动电路的第2时钟信号(第2信号)的配线负荷与也共同输入到另一方数据信号线驱动电路的第1时钟信号(第2信号)的配线负荷相一致,并使两个时钟信号间的信号延迟量之差处于容许范围内。其结果是,可正确进行使用第1及第2时钟信号两方的数据信号线驱动电路中的视频信号取样,使画面质量保持良好。
此外虽然在这里以数据信号线驱动电路为例进行了说明,但即使在扫描信号线驱动电路中,在由1个扫描信号线驱动电路来使用多个系统时钟信号的场合下,各系统时钟信号之间的上述相位差也可引起扫描信号线的选择定时偏差。但由于扫描信号线驱动电路中的时钟信号频率与数据信号线驱动电路的时钟信号频率相比较低,因而基于上述相位差的影响较小,所以用于数据信号线驱动电路将更有效。
即,设置了多个数据信号线驱动电路及扫描信号线驱动电路的构成有以下场合,即:为简化外部接口的构造,只将比如某驱动电路中使用的2个系统的第1及第2时钟信号中1个系统的第1时钟信号(第1信号)也共同输入到其它驱动电路。在这种场合下,在使用第1及第2时钟信号的驱动电路中,由被单独输入的第2时钟信号(第2信号)与共同输入的第1时钟信号(第1信号)的配线负荷的差异而发生信号延迟量差异,其结果是,两个时钟信号的相位关系中将产生偏差,画面质量下降。此外如果通过由外部电路来校正时钟信号,来处理该相位关系的偏差,则会增加电耗。
然而,通过设置使单独输入到驱动电路的第2信号的配线负荷与也共同输入到其它电路的第1信号的配线负荷相一致的配线负荷调整单元,可以不采用在外部电路对时钟信号实施校正,从而致使电耗增加的方法,来使基于上述两个时钟信号间的信号延迟量之差的相位关系之差处于容许范围内,并良好地保持画面质量。
即,通过上述构成,具有可以提供一种显示装置的效果,其中,即使在多个系统的时钟信号等互相关联的多个信号被输入到驱动电路,为简化外部接口的构造,一部被单独输入(第2信号),另一部被共同输入到其它电路(第1信号),即在相关联的多个信号之间通过不同的配线敷设来输入,也不增大电耗,不受基于敷设差异的影响,可进行良好的显示。
本发明的其它目的、特征及优点通过下文可明晓。通过参照了附图的以下说明,可了解本发明的长处。
附图说明
图1表示本发明的一实施方式,是概略表示设有虚配线的液晶显示装置的配线主要部分的平面图。
图2是表示上述液晶显示装置的构成概略的框图。
图3是表示上述液晶显示装置中像素构成的等效电路图。
图4是表示上述液晶显示装置中第1数据信号线驱动电路的一种构成例的电路框图。
图5是有关图4的第1数据信号线驱动电路的各信号的定时图。
图6是表示上述液晶显示装置中第2数据信号线驱动电路的一种构成例的电路框图。
图7是有关图6的第2数据信号线驱动电路的各信号的定时图。
图8(a)是将虚配线一例放大来显示的附图。
图8(b)是表示构成配线负荷调整单元的电容部的构成的附图。
图8(c)是表示采用薄膜晶体管的半导体层来构成的配线负荷调整单元的附图。
图9(a)是表示设置形成虚配线来构成配线负荷调整单元的电容的位置示例的平面图。
图9(b)是表示设置形成虚配线来构成配线负荷调整单元的电容的位置示例的平面图。
图10是表示传统的一般液晶显示装置的构成概略的框图。
图11是表示在具有2个数据信号线驱动电路的液晶显示装置中,在2个数据信号线驱动电路之间共同输入1个时钟信号ck1·ck2的构成的平面图。
图12是输入到上述2个数据信号线驱动电路的时钟信号ck1·ck2的波形图。
具体实施方式
以下利用图1至图9(b),对本发明涉及的一种实施方式作以说明。
在本实施方式中,作为显示装置,例示一种有源矩阵型液晶显示装置。
本实施方式中的有源矩阵型液晶显示装置如图2所示,具备像素阵ARY、扫描信号线驱动电路GD1、配置于像素阵ARY的上下的第1及第2这2个数据信号线驱动电路SD1·SD2。
像素阵ARY具有互相交叉的多个扫描信号线GL(1)~GL(j)以及数据信号线SL(1)~SL(i),在由邻接的2个扫描信号线GL·GL以及邻接的2个数据信号线SL·SL划分的部分中,各配备1个像素PIX。像素PIX...配置为矩阵状。
第1及第2数据信号线驱动电路SD1·SD2均主要由移位寄存器与取样电路来构成。其中,在第1数据信号线驱动电路SD1中,由未图示的外部电路,与视频信号VIDEO一起,输入作为控制信号的起动脉冲信号SSP1及2个系统的第1及第2时钟信号SCK1·SCK2。在第2数据信号线驱动电路SD2中,由未图示的外部电路,与视频信号VIDEO一起,共同输入作为控制信号的起动脉冲信号SSP2及被输入到第1数据信号线驱动电路SD1的第1时钟信号SCK1。
有关这些第1及第2数据信号线驱动电路SD1·SD2的详细构成及动作,利用图4~图7在后文中记述,2个数据信号线驱动电路SD1·SD2被设置为从其两端侧来裹夹数据信号线SL(1)~SL(i),数据信号线驱动电路SD1·SD2这两方驱动数据信号线SL(1)~SL(i)。
扫描信号线驱动电路GD主要由移位寄存器来组成,由未图示的外部电路,输入作为控制信号的起动脉冲信号GSP及时钟信号GCK。扫描信号线驱动电路GD在输入了起动脉冲信号GSP的脉冲后,与时钟信号GCK的定时信号同步,来依次选择并驱动扫描信号线GL(1)~GL(j)。由此来控制处于像素PIX内的后述转换元件的开闭,将写入数据信号线SL的视频信号(数据)写入像素PIX,同时保持写入像素PIX的数据。
像素PIX如图3所示,由作为有源元件的场效应薄膜晶体管SW及像素电容CP来构成。像素电容CP由液晶电容CL及根据需要附加的辅助电容CS来形成。通过作为有源元件的薄膜晶体管SW的漏极及源极,来连接数据信号线SL与构成像素电容CP的液晶电容CL及辅助电容CS的各一方的电极。薄膜晶体管SW的栅极与扫描信号线GL连接。液晶电容CL的另一方电极与在整个像素中共同设置的对置电极COM连接,辅助电容的另一方电极也通过在整个像素中共同设置的通用电极线来与对置电极COM连接。这样,根据施加于各液晶电容CL的电压,来调制液晶的透过率或反射率,以用于显示。
接下来,利用图4~图7,对上述第1及第2数据信号线驱动电路SD1·SD2中的构成及动作一例作以说明。这里,对2个数据信号线驱动电路SD1·SD2是互相独立驱动的高分辨率用数据信号线驱动电路及低分辨率用数据信号线驱动电路的场合作以说明。
图4表示在图2中配置于上方的第1数据信号线驱动电路SD1的电路构成。高分辨率用第1数据信号线驱动电路SD1具有2个系列的移位寄存器SR1·SR2和通过输入来自该移位寄存器SR1·SR2的各输出,来对另外输入的视频信号VIDEO取样的模拟开关ASW1(1)~ASW1(i)。通过这些模拟开关ASW1(1)~ASW1(i),来构成取样电路。
在移位寄存器SR1中,输入起动脉冲信号SSP1及第1时钟信号SCK1,从移位寄存器SR1依次输出的取样信号SMP1(1)、SMP1(3)...SMP1(i-1)被提供给模拟开关ASW1(1)、ASW1(3)~ASW1(i-1),使模拟开关ASW1(1)、ASW1(3)~ASW1(i-1)依次通路。在模拟开关ASW1(1)、ASW1(3)~ASW1(i-1)通路期间,另外输入的视频信号VIDEO被取样,并向对应的数据信号线SL(1)、SL(3)、~SL(i-1)输出。
另一方面,在移位寄存器SR2中,输入起动脉冲信号SSP1及第2时钟信号SCK2,从移位寄存器SR2依次输出的取样信号SMP1(2)、SMP1(4)...SMP1(i)被提供给模拟开关ASW1(2)、ASW1(4)~ASW1(i),使模拟开关ASW1(2)、ASW1(4)~ASW1(i)依次通路。在模拟开关ASW1(2)、ASW1(4)~ASW1(i)通路期间,视频信号VIDEO被取样,向对应的数据信号线SL(2)、SL(4)、~SL(i)输出。
图5表示有关这种第1数据信号线驱动电路SD1的各信号的定时图。第1时钟信号SCK1与第2时钟信号SCK2具有其相位偏差1/4周期的关系,起动脉冲信号SSP1被提供给移位寄存器1和移位寄存器SR2后,各移位寄存器SR1·SR2与所提供的第1时钟信号SCK1或第2时钟信号SCK2同步,依次输出取样信号SMP1(1)、SMP1(2)...SMP1(i)。
另一方面,图6表示在图2中配置于下方的第2数据信号线驱动电路SD2的电路构成。第2数据信号线驱动电路SD2是一种低分辨率用的数据信号线驱动电路,只有1个移位寄存器SR3。在移位寄存器SR3中,输入起动脉冲信号SSP2和第1时钟信号SCK1。
从移位寄存器SR3依次输出的SMP2(1)、SMP2(2)...SMP2(i/2)被提供给模拟开关ASW2(1)、ASW2(2)~ASW2(i),使模拟开关ASW2(1)、ASW2(2)~ASW2(i)中的两个同时依次通路。在模拟开关ASW2(1)、ASW2(2)~ASW2(i)通路期间,向对应的数据信号线SL(1)、SL(2)、~SL(i)每次输出2个视频信号VIDEO。
图7表示有关这种第2数据信号线驱动电路SD2的各信号的定时图。起动脉冲信号SSP2被提供给上述移位寄存器SR3后,移位寄存器SR3与所提供的第1时钟信号SCK1同步,依次输出取样信号SMP2(1)、SMP2(2)...SMP2(i/2)。
这样,在第2数据信号线驱动电路SD2中,2个模拟开关被同时控制,视频信号VIDEO被同时提供给2条数据信号线SL·SL。因此,与利用第1数据信号线驱动电路SD1在像素阵ARY中进行显示的场合相比,显示上的分辨率达到一半。
不过,在具有第1及第2这2个数据信号线驱动电路SD1·SD2的上述构成中,由2个数据信号线驱动电路SD1·SD2共用的第1时钟信号(第1信号)SCK1被共同输入到2个数据信号线驱动电路SD1·SD2。这样,与将第1时钟信号SCK1另外输入到第2数据信号线驱动电路SD2的构成相比,可简化外部接口的构造。
此外在构成为将第1时钟信号SCK1共同输入到2个数据信号线驱动电路SD1·SD2的场合下,虽然在驱动第1数据信号线驱动电路SD1的场合下,也向第2数据信号线驱动电路SD2提供,但由于在第2数据信号线驱动电路SD2中不输入起动脉冲信号SSP2,因而第2数据信号线驱动电路SD2不动作。
然而,如果单独共同输入第1时钟信号SCK1,如上所述,由于第1时钟信号SCK1及单独输入的第2时钟信号SCK2(第2信号)中的配线负荷不同,因而在采用第1时钟信号SCK1及第2时钟信号SCK2双方的第1数据信号线驱动电路SD1中,在第1及第2时钟信号SCK1·SCK2之间将产生信号延迟量差异,相位关系会发生偏差。如果第1及第2时钟信号SCK1·SCK2的相位关系发生偏差,则第1数据信号线驱动电路SD1中视频信号VIDEO的取样定时将发生微妙的偏差,使画面质量下降。此外如果通过在外部电路对时钟信号进行校正,来处理该相位关系偏差,则会增大电耗。
为此,在本实施方式中,如图1所示,在单独输入的第2时钟信号SCK2用的配线2中设置虚配线3,从而使共同输入的第1时钟信号SCK1用的配线1与单独输入的第2时钟信号SCK2用的配线2的配线负荷相一致。这里,配线负荷的调整意味着对各配线1·2的时间常数,即上述时间常数τ=电容C*电阻R(τ=CR)进行调整。在按照使配线2的配线负荷与配线1的配线负荷相一致的原则来进行的调整中,通过使由时间常数而达到近似的各配线的时间常数相一致,可以容易地进行配线负荷的调整。
详细地说,如图1所示,虚配线3在作为比数据信号线驱动电路SD1更靠近基片端部侧的信号输入部5的空置区域,即在与不构成用于显示的显示部,而具有对置电极COM的对置基片之间裹夹有液晶层的区域内,形成折扇状(参照图8(a))。通过在该区域内设置虚配线3,如图8(b)所示,将该虚配线3作为一方电极,将对置电极COM作为其它电极4,并使液晶层作为电介体10,以此来形成附加电容部7,它可作为配线负荷调整单元来起作用。
通过如此设置虚配线3,并使配线2的配线负荷与配线1的配线负荷相一致,第1及第2时钟信号SCK1·SCK2的配线负荷可达到一致,可使第1数据信号线驱动电路SD1中第1及第2时钟信号SCK1·SCK2之间的信号延迟量之差处于容许范围内,并正确地保持相位关系。其结果是,在第1数据信号线驱动电路SD1中,可正确实施视频信号VIDEO的取样,提高画面质量。
此外在该场合下,由于利用作为显示装置而本来具有的构件来构成作为配线负荷调整单元的附加电容部7,因而可将基于具备有配线负荷调整单元的成本上扬抑制到最小限度。
此外,在具有本实施方式中的液晶层的液晶显示装置的场合下,配线1与配线2中配线负荷产生差异的最大原因是:在敷设至第2数据信号线驱动电路SD2的配线部分1a中,在液晶层与对置电极COM之间形成电容(参照图1)。因此,尤其是在液晶显示装置的场合下,如上所述,通过由虚配线3与液晶层及对置电极COM来形成电容,以作为附加电容部7,而且通过使设置于配线2的虚配线3采用与上述敷设配线部分1a相同的材质,使配线1与配线2中各配线自身所具有的电阻R相等,可以在配线1·2之间容易地使时间常数相一致,可简单地调整配线负荷。
此外,虽然这里在信号输入部5附近的空置区域以折扇状来形成虚配线3,但也可以使虚配线形成平板状,以成为与对置电极COM平行的平板。此外如图9(a)及图9(b)所示,也可以在显示部周围形成虚配线3(由粗线表示),来作为附加电容部7。这样,通过使虚配线3沿着敷设至第2数据信号线驱动电路SD2的配线部分1a来设置,或者设置到像素阵ARY的相反侧,以与配线部分1a对称,便可以在材质、配线幅度相等的场合下,只需使配线长度相同,便可在配线1·2之间容易地使时间常数相一致。
此外作为附加电容部7,除了由虚配线3与液晶层及对置电极COM来形成电容的构成之外,作为比如由图8(b)所示的虚配线3来形成电容的其它电极4,也可以采用与形成液晶电容CL的未图示的像素电极的同一透明导电膜及为利用接触孔来实现配线交叉而另外设置的其它金属层,将处于这些透明导电膜及金属层导电膜与虚配线3之间的层间绝缘膜作为电介体10来形成电容,以作为附加电容部7。
此外,也可以利用构成作为在像素阵ARY中形成的有源元件的薄膜晶体管SW的各层,如图8(c)所示,作为其它电极4,在薄膜晶体管SW的半导体层9中添加杂质等,使其具有高电阻金属的特性,作为电极来起作用,将处于具有金属的特性的该半导体层9与虚配线3之间的栅极绝缘膜8作为电介体10来形成电容,以作为附加电容部7。
在任意的附加电容部7中,由于利用作为显示装置而本来具有的构件来构成,因而可将基于作为附加电容部7来具有的配线负荷调整单元的成本上扬抑制到最小限度。此外,虽然在使时间常数相一致来调整配线负荷方面,这种不利用液晶层及对置电极COM的构成并不比利用液晶层的构成更加容易,但也可设置到未层积液晶层及对置电极COM的部分,因而敷设自由度得到提高。
如上所述,在本实施方式下的有源矩阵型液晶显示装置中,即使在只将第1数据信号线驱动电路SD1中使用的第1及第2时钟信号SCK1·SCK2中的第1时钟信号SCK1也共同输入到第2数据信号线驱动电路SD2的构成中,由于设有使第1及第2时钟信号SCK1·SCK2的配线负荷(正确地说,是提供第1及第2时钟信号SCK1·SCK2的各配线1·2的配线负荷)相一致的附加电容部7,因而不在外部电路侧实施第1及第2时钟信号SCK1·SCK2的加工从而增大电耗,从而可以不受基于配线敷设的差异的影响,可进行良好的显示。
此外在本实施方式中,虽然将共同输入第1时钟信号SCK1的电路作为数据信号线驱动电路SD2,但为了稳定地进行对下一帧中数据信号线SL(1)~SL(i)的写入,也可以是在回扫期间使数据信号线SL(1)~SL(i)预充电的预充电电路。此外虽然在这里假设2个数据信号线驱动电路SD1·SD2的对应分辨率各异,但也可以是彩色显示用及黑白显示用的数据信号线驱动电路,此外也可以构成为2个数据信号线驱动电路SD1·SD2连动驱动,并可进行重叠显示等,此外,也可以构成为将配线负荷调整单元设置到扫描信号线驱动电路。
总之,在这种在至少一个驱动电路(并非局限于数据信号线驱动电路)中,输入互相关联的多个信号(并非局限于2种),其中的至少1个信号也被共同输入到其它电路(也可以不是驱动电路)的构成中,可设置这种虚配线(也包含平板状)3来形成电容,使相关信号之间的配线负荷相一致。
此外在本发明中,虽然采用一种使互相关联的多个信号,即第1及第2信号之间的配线负荷相一致的表示形式,但这当然也包含使比如上述配线1·2的配线负荷相等来使其一致的场合,总之在共用第1及第2信号的驱动电路内,在单独输入的第2信号与也被共同输入到其它电路的第1信号之间,各配线负荷中各自量延迟了的各信号的相位关系可与信号设计时相同,极端地说,也可以通过使一方信号较大地延迟,将相位延迟1个周期,来使相位达到一致。
此外,虽然作为互相关联的多个信号,即第1及第2信号,在这里例示了时钟信号,但也包括比如是由多个位构成的数字视频信号,是至少分为2个位组的数字视频信号的场合。即,考虑了一种以下场合,即,将6位数字视频信号向第1数据信号线驱动电路SD1输入,另一方面,只将上述6位数字视频信号中的上3位向第2数据信号线驱动电路SD2输入,通过数据信号线驱动电路SD1及SD2来与不同的灰度对应。
在这种场合下也采用以下构成,即,为简化外部接口,将视频信号VIDEO分为上3位和下3位,只将上3位也输入到其它电路。
在这种场合下,在由于上述配线负荷的原因,致使向第1数据信号线驱动电路SD1输入的6位数字视频信号中,上3位信号的配线负荷与下3位信号的配线负荷相异的场合下,在第1数据信号线驱动电路SD1中,在对数字视频信号取样时,可能会发生相位差,造成取样错误,但通过采用本发明来使相位差达到一致,可不发生上述取样错误,电路可正常动作。
此外如上所述,本发明适于与上述第1信号由共同的输入端共用信号线,来输入到上述驱动电路及上述其它电路的构成的组合。通过第1信号由共同的输入端共用信号线来输入的构成,可以减少比如输入信号的输入端数,可有效应用基片面积。
本发明的显示装置中,上述配线负荷调整单元最好使各配线的时间常数相一致。
在调整配线负荷时,可由时间常数,即配线电容值C及配线电阻值R来算出。配线电容值C由构成电容的配线幅度及长度和裹夹于配线之间的电介体的比介电常数来算出。此时为调整电容值,可以变更比如配线幅度及长度,构成负荷的配线电阻值也可通过变更配线长度及配线幅度来调整。这样,通过设计为使由时间常数τ=电容C*电阻R(τ=CR)近似计算出的各配线的时间常数相一致,可以容易地进行配线负荷的调整。
本发明的显示装置中,上述扫描信号线及上述数据信号线最好在基片上形成,并且在该基片与形成了对置电极的基片之间裹夹有液晶层,上述配线负荷调整单元最好将上述液晶层用作电介体,具有与输入到上述驱动电路的第2信号的配线连接的虚配线;该虚配线上的上述液晶层;上述对置电极。
根据上述构成,在配线负荷小的,单独输入到驱动电路的第2信号的配线中设置虚配线,由该虚配线、对置电极、液晶层来构成用于配线负荷调整的电容。
由于这种配线负荷调整单元利用作为显示装置所本来具有的构件来构成,因而可将基于具备配线负荷调整单元的成本上扬抑制到最小限。
此外,在具有液晶层的液晶显示装置的场合下,单独输入到驱动电路的第2信号的配线负荷与也共同输入到其它电路的第1信号的配线负荷产生差异的最大原因在于,第1信号中引向其它电路的配线部分在液晶层与对置电极之间形成电容,其可达到不能忽视的程度。
因此,根据这种构成,通过将虚配线设计成达到与将第1信号引向上述其它电路的配线部分相等的条件,可简单地调整配线负荷。
本发明的显示装置中,最好上述扫描信号线及上述数据信号线在基片上形成,并且在该基片上还形成有层间绝缘膜和导电膜,上述配线负荷调整单元将上述层间绝缘膜用作电介体,具有与输入到上述驱动电路的第2信号的配线连接的虚配线;上述层间绝缘膜;上述导电膜。
根据上述构成,在配线负荷小的,单独输入到驱动电路的第2信号的配线中设置虚配线,由形成于该虚配线的层间绝缘膜及导电膜,来构成用于配线负荷调整的电容。
在上述扫描信号线与上述数据信号线之上,通过层间绝缘膜来形成由透明导电膜等组成的像素电极,或者通过层间绝缘膜来设置用于实现配线交叉的金属层。因此,可将层间绝缘膜用作电介体,将在其上形成的导电膜作为另一方电极来构成电容。
即,在这种配线负荷调整单元中同样,由于利用作为显示装置所本来具有的构件来构成,因而可将基于具备配线负荷调整单元的成本上扬抑制到最小限。
本发明的显示装置中,最好在上述扫描信号线与上述数据信号线的各交点,设有薄膜晶体管,上述配线负荷调整单元将构成薄膜晶体管的栅极绝缘膜的层用作电介体,具有与输入到上述驱动电路的第2信号的配线连接的虚配线;分别构成层叠配置于该虚配线的上述薄膜晶体管的栅极绝缘膜层及半导体层的各层。
根据上述构成,在配线负荷小的,单独输入到驱动电路的第2信号的配线中设置虚配线,由该虚配线、构成薄膜晶体管的栅极绝缘膜的层、构成薄膜晶体管的半导体层的层来构成用于配线负荷调整的电容。
在上述扫描信号线与上述数据信号线的交点,作为有源元件来设置薄膜晶体管的构成有多种,在这种构成中,可将作为薄膜晶体管构成材料的栅极绝缘膜的构成层作为电介体,在半导体层中添加杂质等,使其具有高电阻金属的特性来起到电极的作用,由此来构成电容。
即,在这种配线负荷调整单元中同样,由于利用作为显示装置所本来具有的构件来构成,因而可将基于具备配线负荷调整单元的成本上扬抑制到最小限。
作为发明详细说明的具体实施方式或实施例不过是用于明晓本发明的技术内容,不应只局限于这种具体示例来作狭义解释,在本发明的精神及以下记载的权利要求范围内,可进行各种变更来实施。

Claims (14)

1.一种液晶显示装置,具有驱动扫描信号线(GL)的扫描信号线驱动电路(GD);驱动与上述扫描信号线(GL)交叉配置的数据信号线(SL)的数据信号线驱动电路(SD1·SD2),其特征在于:
在上述扫描信号线驱动电路(GD)或上述数据信号线驱动电路(SD1·SD2)的至少一方的驱动电路中,至少输入第1、第2信号,在输入了第1、第2信号的上述至少一方的驱动电路之外的其它电路中也以共用的方式输入第1信号,
还设有配线负荷调整单元(7),其使输入到上述驱动电路的第2信号的配线负荷与也以共用的方式输入到上述其它电路的第1信号的配线负荷相一致。
2.权利要求1中记载的液晶显示装置,其特征在于:
上述其它电路是驱动上述扫描信号线(GL)或数据信号线(SL)的驱动电路或使数据信号线(SL)预充电的预充电电路。
3.权利要求1中记载的液晶显示装置,其特征在于:
从共用的输入端,以及共用信号线,将上述第1信号输入到上述驱动电路及上述其它电路。
4.权利要求1中记载的液晶显示装置,其特征在于:
上述第1、第2信号是多个时钟信号。
5.权利要求1中记载的液晶显示装置,其特征在于:
上述第1、第2信号是由多个位构成的数字视频信号,是至少分为2个位组的数字视频信号。
6.权利要求1或2中记载的液晶显示装置,其特征在于:
上述配线负荷调整单元(7)使各配线的时间常数相一致。
7.权利要求1中记载的液晶显示装置,其特征在于:
上述扫描信号线(GL)及上述数据信号线(SL)在基片上形成,并且在该基片与形成了对置电极(COM)的基片之间裹夹有液晶层,
上述配线负荷调整单元(7)将上述液晶层用作电介体,具有
与输入到上述驱动电路的第2信号的配线(2)连接的虚配线(3);
该虚配线(3)上的上述液晶层;
上述对置电极(COM)。
8.权利要求7中记载的液晶显示装置,其特征在于:
上述虚配线(3)在作为比数据信号线驱动电路(SD1·SD2)更靠近基片端部侧的空置区域,即在与形成了对置电极(COM)的基片之间裹夹有液晶层的区域的不构成用于显示的显示部的区域内,形成折扇状。
9.权利要求7中记载的液晶显示装置,其特征在于:
上述虚配线(3)形成平板状,并成为与对置电极(COM)平行的平板。
10.权利要求1中记载的液晶显示装置,其特征在于:
上述扫描信号线(GL)及上述数据信号线(SL)在基片上形成,并且在该基片上还形成有层间绝缘膜和导电膜,
上述配线负荷调整单元(7)将上述层间绝缘膜用作电介体(10),具有
与输入到上述驱动电路的第2信号的配线(2)连接的虚配线(3);
上述层间绝缘膜;
上述导电膜。
11.权利要求1中记载的液晶显示装置,其特征在于:
在上述扫描信号线(GL)与上述数据信号线(SL)的各交点,设有薄膜晶体管(SW),
上述配线负荷调整单元(7)将构成薄膜晶体管(SW)的栅极绝缘膜的层用作电介体(10),具有
与输入到上述驱动电路的第2信号的配线(2)连接的虚配线(3);
构成层叠配置于该虚配线(3)的上述薄膜晶体管(SW)的栅极绝缘膜(8)及半导体层(9)的各层。
12.权利要求7、10或11中记载的液晶显示装置,其特征在于:
上述虚配线(3)在用于显示的显示部的周围形成。
13.权利要求1中记载的液晶显示装置,其特征在于:
上述其它电路是使数据信号线(SL)预充电的预充电电路。
14.权利要求1或2中记载的液晶显示装置,其特征在于:
上述配线负荷调整单元(7)设置于扫描信号线驱动电路(GD)。
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