CN1413023A - 显示装置 - Google Patents

显示装置 Download PDF

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CN1413023A
CN1413023A CN02146270A CN02146270A CN1413023A CN 1413023 A CN1413023 A CN 1413023A CN 02146270 A CN02146270 A CN 02146270A CN 02146270 A CN02146270 A CN 02146270A CN 1413023 A CN1413023 A CN 1413023A
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aforementioned
voltage
circuit
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image signal
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CN1195242C (zh
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筒井雄介
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Sanyo Electric Co Ltd
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    • G09G3/32Control 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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G3/32Control 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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G3/3225Control 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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control 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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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    • 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
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    • 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
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    • G09G2300/00Aspects of the constitution of display devices
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    • G09G2300/0828Several active elements per pixel in active matrix panels forming a digital to analog [D/A] conversion circuit
    • GPHYSICS
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    • G09G2300/00Aspects of the constitution of display devices
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    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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    • 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
    • G09G3/22Control 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 using controlled light sources
    • G09G3/30Control 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 using controlled light sources using electroluminescent panels
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
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    • H03M1/66Digital/analogue converters
    • H03M1/68Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits
    • H03M1/682Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits both converters being of the unary decoded type
    • HELECTRICITY
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    • H03M1/66Digital/analogue converters
    • H03M1/74Simultaneous conversion
    • H03M1/76Simultaneous conversion using switching tree
    • H03M1/765Simultaneous conversion using switching tree using a single level of switches which are controlled by unary decoded digital signals

Abstract

本发明提供一种显示装置,在内藏有DA转换器的显示装置中,抑制电路规模,以对应多位化。本发明的显示装置由设置于多个像素的周边部的第1DA转换器,及设于各像素内的第2DA转换器而构成用以将数字图像信号转换为模拟图像信号的DA转换器,通过第1DA转换器对6位数字图像信号内的上位44位进行DA转换,同时通过第2DA转换器,对剩余的下位2位进行DA转换。藉此,可简化像素的周边电路的构成,并抑制显示面板的框面积的增加,同时可通过增加DA转换器的位数,而实现多等级的显示。

Description

显示装置
技术领域
本发明涉及一种显示装置,特别涉及一种具备有将数字图像信号变换为模拟图像信号的DA转换器的显示装置。
背景技术
一般而言,液晶显示装置,是将模拟图像信号供给至各像素的像素电极,使施加于液晶的电场产生变化,并使液晶定向,藉此进行液晶显示。在此,系以内藏有DA转换器的液晶显示装置为人所知,而该DA转换器用以将从外部机器所输入的数字图像信号转换为模拟图像信号。以下,参照图面以说明该种显示装置。图8为现有的主动矩阵型显示装置的电路图。像素领域是通过在第1行配列像素G11,G12,G13,…,而在第2行配列像素21,22,23,…而使整体由配置成行与列的矩阵的多个像素所构成。
此外,在各像素中设有N通道型的像素选择晶体管72(薄膜晶体管)。像素选择晶体管72的漏极与来自水平驱动电路30的漏极信号线61,62,63相连接。此外,像素选择晶体管72的栅极则分别与来自垂直驱动电路40的栅极信号线51,52、…相连接。
举例说明像素GS11的具体构成,如图9所示,像素选择晶体管72的漏极72s与液晶21的像素电极80相连接。另外,设置有补偿电容85,用以将像素电极80的电压保持在一场期间,该补偿电容85的一方端子86与像素选择晶体管72的漏极72s相连接,另一方电极87则施加有共通的电位。在此,若对栅极信号线51施加栅极扫瞄信号(H位准),则像素选择TFT72将变为导通状态,并随着模拟图像信号从漏极信号线61传送至像素电极80而保持于补偿电容85。可通过将施加于像素电极80的图像信号电压施加到液晶21,并对应该电压使液晶定向而获得液晶显示。关于其它各像素的构成完全与上述相同。
此外,关于水平驱动电路30的构成,系如以下所述一般。例如,由外部供给4位的数字图像信号D0至D3。而在各列,设置闩锁数字图像信号D0至D3的4位构成的第1闩锁电路1-1,1-2,1-3…。该等闩锁电路1-1,1-2,1-3…对应取样脉冲SPR1,SPR2,SPR3而依序取样数字图像信号,并仅保持一水平期间。在此,取样脉冲SPR1,SPR2,SPR3…由移位缓存器10,10,…所作成。换言之,移位缓存器10,10,…对应水平时脉CKH而作成将水平激活信号STH依序移位的取样脉冲。
保持于第1的闩锁电路1-1,1-2,1-3…的数字图像信号D0至D3,是根据于一水平期间结束后产生的转移脉冲TP,同时被闩锁在4位构成的第2的闩锁电路2-1,2-2,2-3,…,并在通过DA转换器3-1,3-2,3-3,…并转换为模拟图像信号后,输出至漏极信号线61,62,63…。
此外,垂直驱动电路40对应垂直时脉CKV而将依序移动垂直激活信号STV的栅极脉冲(各一水平期间逐一形成高位准),依序输出至栅极信号线51,52,…。
此外,关于DA转换器3-1,以使用图10所示的译码电路的方式最为普遍。该DA转换器3-1是通过译码电路90将数字图像信号D0至D3译码,并从供给至16条的参考电压线的16个参考电压V0至V15中选择1个参考电压Vj,而从输出端子91输出。译码电路90由供给数字图像信号D0至D3的晶体管数组所构成。例如,当数字图像信号为(0110)时,4个串连晶体管93全部变为导通,并选择性输出参考电压V6。此外,DA转换器3-2,3-3…具有相同结构。
接着,参照图11所示的时序图说明上述构成的液晶显示装置的动作。在此,针对数字图像信号D0至D3中的第1位的数字图像信号D0进行说明。其它位亦同。数字图像信号D0与水平时脉CKH同步而以时系列方式变化为数据D00,D01,D02。因此,数据D00对应取样脉冲SRP1而闩锁于闩锁电路1-1,而数据D01则对应取样脉冲SRP2而闩锁在闩锁电路1-1。
接着,经过一水平期间,将数字图像信号D0闩锁于闩锁电路1-1,1-2,1-3后,对应转送脉冲TP,而将闩锁于闩锁电路1-1,1-2,1-3的数据D00,D01,D02同时闩锁在闩锁电路2-1,2-2,2-3。接着,该闩锁数据D00,D01,D02通过DA转换器3-1,3-2,3-3,…而转换为模拟图像信号后,输出至漏极信号线61,62,63,…。
上述的现有液晶显示装置,是在配置于像素周边部的水平驱动电路30内,设置DA转换器3-1,3-2,3-3,…。因此会产生像素的周边电路,特别是水平驱动电路30的构成复杂化,且液晶显示面板的框面积增大的问题。
此外,由于该种DA转换器系使用译码电路90的方式,因此不仅会增加等级数,同时会大幅增加晶体管元件数或参考电压线的配线数。因此有不易实现可同时实现高精细与多等级的显示装置的问题。
发明内容
本发明的显示装置系由:将把数字图像讯转换为模拟图像信号的DA转换器设于多个像素的周边部的第1DA转换器;以及设于各像素内的第2DA转换器所构成,在通过第1DA转换器,对n位的数字图像信号中的m位(m<n)进行DA转换的同时,通过第2DA转换器对剩余的位(n-m)进行DA转换。
藉此,可简化像素的周边电路的构成,并抑制显示面板的框面积的增加,同时通过增加DA转换器的位数,可实现多等级的显示。
在此,上述的第1DA转换器以及第2DA转换气的最佳实施形态如下所述。
首先,第1DA转换器具备有:产生与m位的数字图像信号相对应的多个参考电压的参考电压产生电路;对应m位的数字图像信号并由多个参考电压选择对应的参考电压对的参考电压选择电路。这是译码电路型转换器,在位数较小时,因电路规模不大之故,而具有效用。
与该第1DA转换器组合的第2DA转换器,具备有:产生参照电压对间的多个电压的踢形电阻电路;以及对应(n-m)位的数字图像信号,而在前述多个电压中,选择一个电压的电压选择电路。这是一种梯形电阻型的DA转换器。
与该第1DA转换器组合的第2DA转换器,具备有:附加电容值的加权的多个电容元件;对应(n-m)位的数字图像信号,而将参考电压对电压选择性地供给至多个电容元件的电极的电压供给电路;对应时序信号而将多个电容元件所蓄积的电荷供给至像素电极的电荷转送晶体管。这是一种电容型的DA转换器。
此外,其它的第1DA转换器,具备有:将增量n位的数据的参考数字数据以时系列方式输出的参考数据产生电路;与参考数字数据的变化同步变化,并且产生与该参照数字数据对应的阶梯电压对的阶梯电压产生电路;检测出数字图像信号数据与参考数字数据的一致性,并输出一致性检测信号的一致性检测电路;以及对应一致性检测信号以输出阶梯电压对的栅极电路。
由于该DA转换器并未使用译码电路,因此即使增加位数也能够抑制晶体管数及配线数的增加。此外,与该第1DA转换器组合的第2DA转换器,可直接利用上述的梯形电阻型的DA转换器,及电容型的DA转换器。
附图说明
图1为本发明的第1实施形态的显示装置电路图。
图2为由参考电压选择电路所选择的参考电压对Vj,Vj+1的真值表。
图3(a)及(b)为第2DA转换器的电路图。
图4(a)及(b)为第2DA转换器的另一电路图。
图5为本发明的第2实施形态的显示装置电路图。
图6为显示阶梯电压产生电路的动作时序图。
图7为显示互斥逻辑和电路的电路图。
图8为现有的液晶显示装置的电路图。
图9为现有的液晶显示装置的像素构成的电路图。
图10为使用于现有的液晶显示装置的DA转换器电路图。
图11为显示现有的液晶显示装置的动作的时序图。【图号说明】1-1、1-2、1-3、2-1、2-2、2-3      闩锁电路3-1、3-2、3-3DA                   转换器5、6    参考电压选择电路          7     梯形电阻电路8       电压选择电路              9     电压供给电路10      移位缓存器                12    参考电压产生电路13-1、13-2      第1闩锁电路14-1、14-2      第2闩锁电路15      参考数据产生电路        16      阶梯电压产生电路17      一致性检测电路          18      互斥逻辑和电路19      非或电路                20A,21A栅极晶体管21      液晶                    30      水平驱动电路40      垂直驱动电路47      EL元件                  48      驱动晶体管51、52、53      栅极信号线61、62、63      漏极信号线72      像素选择晶体管          72s     漏极80      像素电极                81、82  电容电极85      补偿电容                86      端子87      电极                    TG      像素选择晶体管D0至D5          数字图像信号R1、R2、R3、R4  电阻RD2至RD5        参考数字数据T1、T3、T5、T10、T12    P通道型TFTT2、T4、T6、T11、T13    N通道型TFTC1、C2电容元件
具体实施方式
接着,参照图面说明本发明的第1实施形态的显示装置。图1为本发明的第1实施形态的显示装置的电路图。此外,为简化说明仅例示水平驱动电路的2列,像素部的2行2列部分。此外,垂直驱动电路40系与前述者相同。
6位的数字图像信号D0至D5由外部所供给。6位构成的第1闩锁电路13-1,13-2对应取样脉冲SPR1,SPR2取样数字图像信号D0至D5,且仅保持一水平期间。在此,取样脉冲SPR1,SPR2通过移位缓存器10-1,10-2所作成。换言之,移位缓存器10-1,10-2对应水平时脉CKH而作成依序将水平激活信号STH移位的取样脉冲。
保持于第1闩锁电路13-1,13-2的数字图像信号D0至D5,根据产生于一水平期间结束后的转移脉冲TP,同时闩锁于6位构成的第2闩锁电路14-1,14-2后,进行DA转换。
DA转换器系由:设于多个像素GS11,GS12…周边部的第1DA转换器;及设于各像素GS11,GS12…的第2DA转换器所构成。在第1DA转换器对6位的数字图像信号D0至D5中的4位进行DA转换的同时,第2DA转换器对剩余的2位进行DA转换。
在此,第1DA转换器系由:产生与上位4位的数字图像信号相对应的17个参考电压V0至V16的参考电压产生电路12;以及对应该4位的数字图像信号,并由参考电压V0至V16选择对应的参考电压对Vj,Vj+1的一对参考电压选择电路5,6所构成。
参考电压产生电路12,例如可通过连接在电源电压Vdd与接地电压Vss之间的梯形电阻来构成。在此,图2为显示由参考电压选择电路5,6所选择的参考电压对Vj,Vj+1的真值表。参考电压选择电路5,6为求与该真值表一致,可通过变更图10所示的译码电路的晶体管数组而容易地构成。
上位4位的数字图像信号D2至D5系根据该真值表,数字·模拟转换为参考电压对Vj,Vj+1(模拟电压对)。参考电压对Vj,Vj+1是从17个参考电压V0至V16中所选出的邻接电压对,其大小关系为Vj<Vj+1。因此,以下将由参考电压选择电路5,6所选择的参考电压对Vj,Vj+1标记为电压对VL,VH。
此外,第2DA转换器内藏于各像素GS11,GS12,而对下位的2位的数字图像信号D0,D1进行DA转换。参照图3进行说明其具体构成。图3(a)显示内藏有第2DA转换器的液晶显示装置的像素GS11的电路图。此外,其它像素方面亦同。图3(b)显示电致发光显示装置(以下简称为EL显示装置)的像素电路图。在该EL显示装置中,取代液晶21而导入EL元件47以及用以电流驱动该EL元件47的驱动晶体管48。换言之,是对驱动晶体管48的栅极施加经DA转换的模拟电压。驱动晶体管48对应该模拟电压,而控制流通于EL元件47的电流,藉此以进行电致发光显示。有关DA转换器部分,与图3(a)完全相同。
梯形电阻电路7由串连连接在电压对VL,VH间的电阻R1,R2,R3,R4所构成。此外,来自该各连接点的电压VH,V2,V3,V1输入至电压选择电路8。电压VH,V2,V3,V1可以下列公式表示。
V1=VL+△V(R1/R)、V2=VL+△V(R1+R2/R),
V3=VL+△V(R1+R2+R3/R)。R=R1+R2+R3+R4,
△V=VH-VL。若设定为R1=R2=R3=R4,则V1=VL+△V/4、V2=VL+△V/2,V3=VL+3△V/4,而形成等间隔的电压。
电压选择电路8为对应下位的2位数字图像信号数据D0,D1,并由上述的电压VH,V2,V3,V1中选择一个电压的电路,是由在栅极施加有数据D0的薄膜晶体管(TFT)T1,T2,T3,T4以及在栅极施加有数据D1的薄膜晶体管(TFT)T5,T6所构成。在此,T1,T3,T5为P通道型TFT,T2,T4,T6为N通道型TFT。换言之,当(D0,D1)=(0,0)时,因T1及T5呈导通状态之故,而将电压V1选择性地输出,而在(D0,D1)=(0,1)时,因T2及T5呈导通之故,而将电压V2选择性地输出,而在(D0,D1)=(1,0)时,因T3及T6呈导通之故,而将电压V3选择性地输出,而在(D0,D1)=(1,1)时,则因T4及T6呈导通状态之故,而将电压VH选择性地输出。
因此,对应扫瞄信号G1,当导通像素选择晶体管TG呈现导通时,由上述电压选择电路8所选择的电压将供给至液晶21的像素电极80。如此,通过上述构成的第1及第2DA转换器,对应6位的数字图像信号D0至D5的模拟电压,可通过像素选择晶体管TG供给至液晶21的像素电极80或驱动晶体管48的栅极,以进行显示。
如此,根据本实施形态,6位的数字图像信号数据D0至D5内的4位,通过配置在像素部的周边部的第1DA转换器进行DA转换,而剩余的2位,则是通过内藏于各像素的第2DA转换器进行DA转换,因此不仅可抑制像素部的周边电路的电路规模,同时还可实现DA转换的多位化。
接着,参照图4说明内设于像素的第2DA转换器的其它具体构成。图4(a)显示内设有第2DA转换器的液晶显示装置的像素GS11的电路图。此外,其它像素亦同。图4(b)显示电致发光显示装置(以下,简称为EL显示装置)的像素的电路图。在该EL显示装置中,取代液晶21而导入EL元件47以及用以电流驱动该EL元件47的驱动晶体管48。换言之,是对驱动晶体管48的栅极施加经DA转换的模拟电压。驱动晶体管48对应该模拟电压,而控制流通于EL元件47的电流,藉此以进行电致发光显示。有关DA转换器部分,与图4(a)完全相同。以下,就图4(a)进行说明,而图4(b)的EL显示装置亦同。
电压供给电路9系由:源极与电压VL连接,且于栅极施加有数字图像信号D1的P通道型薄膜晶体管(TFT)T10;源极与电压VH连接,且于栅极施加有数字图像信号D1的N型通道薄膜晶体管(TFT)T11;源极系与电压VL连接,且于栅极施加有数字图像信号D0的P通道型薄膜晶体管(TFT)T12;以及源极与电压VH连接,且于栅极施加有数字图像信号D0的N通道型薄膜晶体管(TFT)T13所构成。T10以及T11的漏极与电容元件C2的电容电极82共通连接。T12及T13的漏极则与电容元件C1的电容电极81共通连接。
换言之,电压供给电路9是一种对应2位的数字图像信号D0,D1,而将电压对电压VL,VH选择性地供给至附加电容值的加权的电容元件C1,C2的电容电极81,82的电路。在此,将电容元件C1的电容值设定为C,而将电容元件C2的电容值设定为2C。
此外,在电压VL与电容元件C1,C2的另一方电容电极83(共通电极)之间连接有由扫瞄信号G1所控制的像素选择晶体管TG1。在电压供给电路9与电容电极82之间设有由扫瞄信号G1所控制的像素选择晶体管TG2,而在电压供给电路9与电容电极81之间则设有由扫瞄信号G1所控制的像素选择晶体管TG3。此外,在像素选择晶体管TG2,TG3与液晶21的像素电极80之间,则设有电荷转送晶体管TT1,TT2。
以下针对上述的第2DA转换器的动作进行说明。在此,针对将数据写入像素GS11的情形加以说明,而对其他像素的写入情形亦相同。
<当数据D0,D1=(0,0)时>
选择栅极线51时(扫瞄信号G1=高位准),TG1,TG2,TG3形成导通状态,而电容元件C1,C2的另一端电容电极83则形成电压VL。此外,像素电极80的像素电压也形成VL。
由第2闩锁电路14-1形成数据D0,D1=(0,0)时,T10,T12会导通,而电容电极81,82的电压则形成VL。其次,非选择栅极线51时,TG1,TG2,TG3会关断,而选择下一个栅极线52时(扫瞄信号G2=高位准),则转送晶体管TT1,TT2形成导通状态。此时,在电容元件C1,C2与像素电极80之间,会进行电荷的再分配。并由电荷的守恒定律而形成下列公式。
2C×(VL-VL)+C×(VL-VL)+VLxCttl
=2C×(Vpix-Vpix)+C×(Vpix-Vpix)+Vpix×Cttl
由该公式,形成Vpix=VL。Vpix为电容电压,Cttl=CLC+Csc、CLC为液晶21的电容值,Csc为液晶21中附随于像素电极80的寄生电容的电容值。
<当数值D0,D1=(1,0)时>
选择栅极线51时(扫瞄信号G1=高位准),TG1,TG2,TG3形成导通状态,而电容元件C1,C2的另一端的电容电极83则形成电压VL。此外,像素电极80的像素电压也形成VL。
由第2闩锁电路14-1形成数据D0,D1=(1,0)时,T11,T12形成导通状态,电容电极82的电压形成VL,而电容电极81的电压则形成VH。
其次,非选择栅极线51时,TG1,TG2,TG3形成关断状态,而选择下一个栅极线52时(扫瞄信号G2=高位准),则转送晶体管TT1,TT2形成导通状态。此时,在电容元件C1,C2与像素电极80之间,将进行电荷的再分配。并由电荷的守恒定律而形成下列公式。
2C×(VL-VL)+C×(VH-VL)+VL×Cttl
=2C×(Vpix-Vpix)+C×(Vpix-Vpix)+Vpix×Cttl
由该公式,形成Vpix=VL+(VH-VL)×C/Cttl。
<当数值D0,D1=(0,1)时>
选择栅极线51时(扫瞄信号G1=高位准),TG1,TG2,TG3形成导通状态,而电容元件C1,C2的另一端的电容电极83则形成电压VL。此外,像素电极80的像素电压也形成VL。
由第2的闩锁电路14-1形成数据D0,D1=(0,1)时,T11,T12形成导通状态,电容电极82的电压形成VH,而电容电极81的电压则形成VL。
其次,非选择栅极线51时,TG1,TG2,TG3形成关断状态,而选择下一个栅极线52(扫瞄信号G2=高位准)时,则转送晶体管TT1,TT2形成导通状态。此时,在电容元件C1,C2与像素电极80之间,会进行电荷的再分配。并由电荷的守恒定律而形成下列公式。
2C×(VH-VL)+C×(VL-VL)+VL×Cttl
=2C×(Vpix-Vpix)+C×(Vpix-Vpix)+Vpix×Cttl
由该公式,形成Vpix=VL+(VH-VL)×2C/Cttl。
<当数值D0,D1=(1,1)时>
选择栅极线51时(扫瞄信号G1=高位准),TG1,TG2,TG3形成导通状态,而电容元件C1,C2的另一端的电容电极83则形成电压VL。此外,像素电极80的像素电压也形成VL。
由第2的闩锁电路14-1形成数据D0,D1=(1,1)时,T11,T13形成导通状态,电容电极82的电压形成VH,而电容电极81的电压也形成VH。
其次,非选择栅极线51时,TG1,TG2,TG3形成关断状态,而选择下一个栅极线52(扫瞄信号G2=高位准)时,则转送晶体管TT1,TT2形成导通状态。此时,在电容元件C1,C2与像素电极80之间,会进行电荷的再分配。并由电荷的守恒定律而形成下列公式。
2C×(VH-VL)+C×(VH-VL)+VL×Cttl
=2C×(Vpix-Vpix)+C×(Vpix-Vpix)+Vpix×Cttl
由该公式,形成Vpix=VL+(VH-VL)×3C/Cttl。依此类推,当数据增加「1」时,输出电压仅增加(VH-VL)×C/Cttl。因此,当设定Cttl=4C时,可利用等间隔的电压进行DA转换。
接着,参照图面说明本发明的第2实施形态的显示装置。图5为第2实施形态的显示装置的电路图。此外,为简化之故,而仅例示水平驱动电路的2列,及像素部的2行2列部分。此外在垂直驱动电路40方面系与前述者相同。
本实施形态与第1实施形态的相异处在于第1DA转换器的构成。关于其它构成方面可直接使用第1实施形态的构成。如图5所示,第1DA转换器系由:参考数据产生电路15;阶梯电压产生电路16;一致性检测电路17;N通道型的栅极晶体管20A,21A(栅极电路)所构成。
参考数据产生电路15由一种计数器电路所构成,如图6所示,系周期性地反复执行以下动作:根据基准时脉CLB,将4位的参考数字数据RD2至RD5,由最初值的(0000),增量为最大值的(1111),并以一水平期间进行时系列输出,而在下一水平期间,再度重设为初期值(0000),并输出至最大值的(1111)。
在此,基准时脉CKB是例如将水平时脉CKH分频而构成,以使一水平期间所产生的时脉数,等于参考数字数据的数值(等级数)。
阶梯电压产生电路16用以产生阶梯电压对VSL,VSH(模拟电压),该阶梯电压对VSL,VSH与以时系列方式由参考数据产生电路15增量输出的参考数字数据RD2至RD5相对应。且该阶梯电压对VSL,VSH根据图2所示的真值表而产生。例如,在RD2至RD5=0000时,阶梯电压对(VSL,VSH)=(V0,V1),而在RD2至RD5=0001时,则阶梯电压对(VSL,VSH)=(V1,V2)。
此外,阶梯电压对VSL,VSH(模拟电压)的变化,在上述基准时脉CLB中与参考数字数据RD0至RD5的变化同步(参照图6)。在此,阶梯电压产生电路16例如可通过用以产生各阶梯电压VS的梯形电阻,以及对应参考数字数据RD0至RD5而切换并输出各阶梯电压VS的开关群的简单构成。
一致性检测电路17是一种用以检测4位的数字图像信号数据D2至D5,与参考数字数据RD2至RD5所对应的全位的一致性,并输出一致性检测信号的电路。一致性检测电路17具体而言,可由:输入有数字图像信号数据D2至D5的各位,与所对应的参考数字数据RD2至RD5的各位的6个互斥逻辑和电路18-1,…18-4;以及输入有该等互斥逻辑和电路18-1,…18-4的输出的″或非″电路19所构成。互斥逻辑和电路例如可以由图7所示的电路所构成。在图7中,输入数据XA为输入数据A的反转数据,而输入数据XB为输入数据B的反转数据。
互斥逻辑和电路18-1在数字图像信号数据D0与参考数字数据RD0一致时输出逻辑值「0」,而在不一致时则输出逻辑值「1」。其它的互斥逻辑和电路18-1亦同。因此,当数字图像信号数据D2至D5与参考数字数据RD2至RD5的全位数据为一致时,互斥逻辑和电路18-1,…18-4的输出,全部形成逻辑值「0」,而″或非″电路20则输出逻辑值「1」以作为一致性检测信号。
栅极晶体管20A,21A系对应上述一致性检测信号「1」而导通,并输出与数字图像信号数据D2至D5相对应的阶梯电压对VSL,VSH。藉此,对数字图像信号数据D0至D5的上位4位进行数字/模拟转换。
接着,针对上述显示装置的动作时序进行说明。从数字图像信号被闩锁至第2闩锁14之前,均与图11所示的现有例相同,之后,通过对栅极信号线51仅供给一水平期间的扫瞄信号G1(高位准),而使像素选择晶体管72导通。然后,由参考数据产生电路15输出参考数字数据RD2至RD5,而由阶梯电压产生电路16输出与其同步的阶梯电压对VSL,VSH。
接着,在数字图像信号数据D2至D5与参考数字数据RD2至RD5一致的期间内,使栅极晶体管20A,21A导通,并输出与数字图像信号数据D2至D5相对应的阶梯电压对VSL,VSH。藉此,将阶梯电压对VSL,VSH作为第1实施形态所述的电压对VL,VH而供给至设在像素内的第2DA转换器。换言之,在本实施形态中,唯有第1DA转换器不同于第1实施形态,而设在像素内的第2DA转换器,可使用与图3以及图4所示者相同的电路,并对剩余的2位进行DA转换。
根据上述构成的第1DA转换器,相较于利用使用译码电路的第1实施形态的DA转换器的情形,可大幅削减配线数或晶体管元件数。
此外,上述第1以及第2实施形态的显示装置,虽已实现6位的DA转换器,但在第1DA转换器与第2转换器的位数的分配上,并不限于上述实施形态,也可作适当的变更。例如也可在第1DA转换器中DA转换为3位,而在第2DA转换器中DA转换为3位。此外,DA转换的位数也不限于6位,可依所需作适度的增减。
此外,上述构成的显示装置虽是黑白显示的,但本发明也可适用于彩色显示。此时,只需在R,G,B各数字图像信号中,设置第1闩锁电路13、第2闩锁电路14以及DA转换器即可。
此外,本实施形态是关于一种电压控制的液晶显示装置,但也可适用于电流控制的电致发光显示装置。在该情况下,只要导入EL元件以及该EL元件的驱动晶体管以取代各像素的液晶21即可。换言之,是将经DA转换的模拟电压施加于驱动晶体管的栅极。驱动晶体管通过控制对应该模拟电压而流通于EL元件的电流,而进行电致发光显示。
[发明的效果]
本发明的显示装置是由设置于多个像素的周边部的第1DA转换器,及设于各像素内的第2DA转换器而构成用以将数字图像信号转换为模拟图像信号的DA转换器,通过第1DA转换器对n位的数字图像信号内的m位(m<n)进行DA转换,同时通过第2DA转换器,对剩余的位(n-m)进行DA转换。
藉此,可简化像素的周边电路的构成,并抑制显示面板的框面积的增加,同时通过增加DA转换器的位数,可实现多等级的显示。

Claims (13)

1.一种显示装置,具备有:多个像素;以及将n位的数字映像信号转换为模拟图像信号的DA转换器,而将该模拟图像信号供给至前述各像素以执行显示,其特征在于:前述DA转换器,系由:设于前述多个像素的周边部的第1DA转换器;及设于前述各像素内的第2DA转换器所构成,在前述第1DA转换器对前述n位的数字图像信号中的m位(m<n)进行DA转换的同时,前述第2DA转换器对剩余的(n-m)位进行DA转换。
2.如权利要求1所述的显示装置,其特征在于,具备有:对应取样脉冲而闩锁前述数字图像信号的第1闩锁电路;以及对应产生于一水平期间结束后的转送脉冲而闩锁前述第1的闩锁电路的输出的第2闩锁电路,而该第2闩锁电路的输出系输入至前述第1DA转换器。
3.如权利要求1或2所述的显示装置,其特征在于:前述第1DA转换器具备有:产生与前述m位的数字图像信号相对应的多个参考电压的参考电压产生电路;对应前述m位的数字图像信号,并由前述多个参考电压选择对应的参考电压对的参考电压选择电路。
4.如权利要求3所述的显示装置,其特征在于,前述第2DA转换器具备有:产生前述参考电压对间的多个电压的梯形电阻电路;以及对应前述(n-m)位的数字图像信号,而于前述多数电压内选择一个电压的电压选择电路。
5.如权利要求4所述的显示装置,其特征在于,具备有:对应扫瞄信号而将由前述电压选择电路所选择的电压供给至前述像素的像素电极的像素选择晶体管。
6.如权利要求3所述的显示装置,其特征在于,前述第2DA转换器具备有:附加电容值的加权的多个电容元件;对应前述(n-m)位的数字图像信号,而将前述参考电压对电压选择性地供给至前述多个电容元件的电极的电压供给电路;对应时序信号而将由前述多个电容元件所蓄积的电荷供给至前述像素电极的电荷转送晶体管。
7.如权利要求6所述的显示装置,其特征在于,具备有:对应扫瞄信号而将来自前述电压供给电路的电压供给至前述多个电容元件的电极的像素选择晶体管。
8.如权利要求1所述的显示装置,其特征在于,前述第1DA转换器具备有:将增量n位的数据的参考数字数据以时系列方式输出的参考数据产生电路;与前述参考数字数据的变化同步变化,且产生与该参照数字数据相对应的阶梯电压对的阶梯电压产生电路;检测出数字图像信号数据与前述参考数字数据的一致性,并输出一致性检测信号的一致性检测电路;以及对应前述一致性检测信号,以输出前述阶梯电压对的栅极电路。
9.如权利要求8所述的显示装置,其特征在于,具备有:对应取样脉冲而闩锁前述数字图像信号的第1闩锁电路;以及对应产生于一水平期间结束后的转移脉冲而闩锁前述第1闩锁电路的输出的第2闩锁电路,而该第2闩锁电路的输出系输入至前述第1DA转换器。
10.如权利要求8或9所述的显示装置,其特征在于,前述第2DA转换器具备有:产生前述阶梯电压对间的电压的梯形电阻电路;以及对应前述(n-m)位的数字图像信号,而于前述多个电压内选择一个电压的电压选择电路。
11.如权利要求10所述的显示装置,其特征在于,具备有:对应扫瞄信号而将由前述电压选择电路所选择的电压供给至前述像素的像素电极的像素选择晶体管。
12.如权利要求8或9所述的显示装置,其特征在于,前述第2DA转换器具备有:附加电容值的加权的多个电容元件;对应前述(n-m)位的数字图像信号,而将前述阶梯电压对电压选择性地供给至前述多个电容元件的电极的电压供给电路;对应时序信号而将由前述多个电容元件所蓄积的电荷供给至前述像素电极的电荷转送晶体管。
13.如权利要求12所述的显示装置,其特征在于,具备有:对应扫瞄信号而将来自前述电压供给电路的电压供给至前述多数的电容元件的电极的像素选择晶体管。
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