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CN111105752B - 半导体装置 - Google Patents

半导体装置 Download PDF

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CN111105752B
CN111105752B CN201911005367.1A CN201911005367A CN111105752B CN 111105752 B CN111105752 B CN 111105752B CN 201911005367 A CN201911005367 A CN 201911005367A CN 111105752 B CN111105752 B CN 111105752B
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voltage
gray scale
power supply
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scale voltages
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CN111105752A (zh
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中山晃
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Lapis Semiconductor Co Ltd
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    • 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
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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract

本发明的目的在于提供一种半导体装置,其包括即便在显示器件中产生电压变动,也可以良好地抑制伴随所述电压变动的图像劣化的驱动器。本发明的半导体装置包括:灰阶电压生成部,生成按照伽马特性的第一代表灰阶电压~第k代表灰阶电压,并根据第一代表灰阶电压~第k代表灰阶电压,生成第一灰阶电压~第N灰阶电压;驱动部,从第一灰阶电压~第N灰阶电压之中选择与显示数据对应的一个灰阶电压,并将表示已选择的一个灰阶电压的信号作为驱动信号施加至显示器件的源极线;以及变动电压重叠部,当在使显示单元发光的电源电压中产生了电压变动时,使第一代表灰阶电压~第k代表灰阶电压中的至少一个产生与电压变动对应的电压变动。

Description

半导体装置
技术领域
本发明涉及一种包含根据影像信号来驱动显示器件的显示驱动器的半导体装置。
背景技术
当前,将液晶显示面板或有机电致发光(以下,称为有机EL(Electroluminescence))显示面板作为显示器件来装载的电视机或各种移动终端已产品化。
在作为显示器件的例如液晶显示面板,多个源电极与多个栅电极交叉配置。在所述液晶显示面板的源电极与栅电极的各交叉部,形成有包含由一对液晶电极夹持的电容性的液晶层、及晶体管的显示元件。所述晶体管的源极端与源电极连接,漏极端与所述一对液晶电极中的一者的液晶电极连接。另一者的液晶电极被施加公共电压(common voltage)。
另外,作为驱动此种液晶显示面板的显示驱动器,已知有包含灰阶电压(gradation voltage)生成电路与灰阶电压选择电路者(例如,参照专利文献1)。
灰阶电压生成电路包含将多个电阻串联连接所构成的梯形电阻,从包含所述梯形电阻中的各电阻的一端的电压的多个电压中选择按照伽马特性的多个电压,由此获得实施了伽马校正的多个灰阶电压。
灰阶电压选择电路从多个灰阶电压之中,选择与由显示数据表示的亮度级对应的一个灰阶电压作为施加至源电极的灰阶电压,并将其输出。
此外,在液晶显示面板中,在各显示元件内,经由源电极及晶体管而施加至电容性的液晶部的灰阶电压的电压值根据显示图像的内容而大幅度地变化,伴随于此,存在公共电压暂时地变动的情况。因此,存在所述公共电压的变动部分被反映在灰阶电压,而产生画质劣化的担忧。
因此,在所述显示驱动器中,将显示器件的公共电压与基准电压的差部作为公共电压的变动部分来求出,并将其作为校正电压而施加至所述梯形电阻中的特定的电阻的一端。因此,从灰阶电压选择电路中输出的灰阶电压的电压值与校正电压相对应地进行电平转换(level shift),公共电压中所产生的电压变动部分被抵消。由此,伴随公共电压的电压变动的画质劣化得到抑制。
[现有技术文献]
[专利文献]
[专利文献1]日本专利特开2016-206283号公报
发明内容
[发明所要解决的问题]
此外,在所述显示驱动器中,为了生成显示器件的公共电压与基准电压的差作为校正电压,而采用包含运算放大器的反相放大电路。因此,从在公共电压中产生电压变动起至所述公共电压的变动部分被反映在灰阶电压为止,除担负伽马校正的电路以外,存在由反相放大电路所引起的延迟。
由此,在公共电压中所产生的电压变动区间的前端部,无法抵消所述电压变动部分,因此存在无法良好地抑制画质劣化这一问题。
因此,本发明的目的在于提供一种半导体装置,其包括即便在显示器件中产生电压变动,也可以良好地抑制伴随所述电压变动的图像劣化的驱动器。
[解决问题的技术手段]
本发明的半导体装置是驱动显示器件的半导体装置,所述显示器件包含接收与由显示数据表示的亮度级对应的驱动信号的源极线、及根据电源电压以与由所述源极线所接收的所述驱动信号对应的亮度进行发光的显示单元,所述半导体装置包括:灰阶电压生成部,生成按照伽马特性的第一代表灰阶电压~第k(k为2以上的整数)代表灰阶电压,并根据所述第一代表灰阶电压~所述第k代表灰阶电压,生成第一灰阶电压~第N(N为比k大的整数)灰阶电压;驱动部,从所述第一灰阶电压~所述第N灰阶电压之中选择与所述显示数据对应的一个灰阶电压,并将表示已选择的所述一个灰阶电压的信号作为所述驱动信号施加至所述源极线;以及变动电压重叠部,当在所述电源电压中产生了电压变动时,使所述第一代表灰阶电压~所述第k代表灰阶电压中的至少一个产生与所述电压变动对应的电压变动。
[发明的效果]
在本发明中,使实施了伽马校正的代表灰阶电压产生与电源电压中所产生的电压变动相同的电压变动。由此,可良好地抑制伴随电源电压的电压变动的画质劣化。
附图说明
图1是表示作为本发明的半导体装置的包含源极驱动器13的显示装置100的结构的框图。
图2是表示显示单元PC的结构的电路图。
图3是表示源极驱动器13的内部结构的框图。
图4是表示灰阶电压生成部133所包含的基本灰阶电压生成部1330、及伽马校正部1331的内部结构的电路图。
图5是表示红色伽马校正电路GM1的结构的电路图。
图6是表示产生画质劣化的显示器件20的显示图像的形态的一例的图。
图7是表示施加至显示器件20的栅极线群及源极线群的脉冲或信号的波形、及电源电压VDD的电压变动的时序图。
图8是表示红色伽马校正电路GM1的另一结构的电路图。
图9是表示代替变动电压重叠部H0及放大器AM0所采用的变动电压重叠部H0a的结构的电路图。
图10是表示显示装置100的另一结构的框图。
图11是表示显示装置100的另一结构的框图。
符号的说明
13:源极驱动器
20:显示器件
21:显示电源部
133:灰阶电压生成部
1330:基本灰阶电压生成部
1331:伽马校正部
CP、CQ:电容器
H0、H0a:变动电压重叠部
LD:EL元件
PC:显示单元
Q1、Q2:晶体管
具体实施方式
以下,一边参照附图一边对本发明的实施例进行详细说明。
图1是表示作为本发明的半导体装置的包含源极驱动器13的显示装置100的结构的框图。
显示装置100具有源极驱动器13,并且具有驱动控制部11、栅极驱动器12、显示器件20及显示电源部21。
显示器件20例如为将分别包含有机电致发光元件(以下,仅称为EL元件)作为显示元件的多个显示单元PC排列成矩阵状而成的有源矩阵型的显示面板。
显示器件20包括:分别在二维画面的水平方向上延伸的栅极线G1~栅极线Gm(m为2以上的整数)、分别在二维画面的垂直方向上延伸的源极线S1~源极线Sn(n为2以上的整数)、以及电源供给线LN。在显示器件20中,在栅极线G1~栅极线Gm与源极线S1~源极线Sn的各交叉部(由虚线包围的区域)形成有显示单元PC。电源供给线LN与显示器件20所包含的所有显示单元PC、以及端子T0及端子T1连接。端子T0与显示电源部21连接,端子T1与源极驱动器13连接。
图2是表示显示单元PC的结构的电路图。
如图2所示,显示单元PC包括:p沟道金属氧化物半导体(Metal OxideSemiconductor,MOS)型的晶体管Q1及晶体管Q2、电容器CP、以及EL元件LD。
在晶体管Q1的源极连接有源极线S,在所述晶体管Q1的栅极连接有栅极线G。在晶体管Q1的漏极连接有驱动信号保持用的电容器CP的第一电极、及作为驱动用晶体管的晶体管Q2的栅极。在电容器CP的第二电极连接有晶体管Q2的源极及电源供给线LN。在晶体管Q2的漏极连接有EL元件LD的阳极。EL元件LD的阴极被施加接地电位VSS。
通过所述结构,显示单元PC的晶体管Q1若经由栅极线G而接收逻辑电平0的选择信号,则变成开启状态,并将经由源极线S所接收的驱动信号供给至晶体管Q2的栅极及电容器CP。由此,电容器CP保持与由所述驱动信号所示的灰阶电压对应的电荷。另外,晶体管Q2根据经由电源供给线LN所接收的电源电压VDD,生成与由电容器CP所保持的电荷对应的电流量的驱动电流,并将其供给至EL元件LD的阳极。EL元件LD以与所述驱动电流的电流量对应的亮度进行发光。
在图1中,显示电源部21生成用于使各显示单元PC所包含的EL元件发光的电压值固定的电源电压VDD,并将其施加至显示器件20的端子T0。由此,电源电压VDD经由所述端子T0及电源供给线LN而被供给至显示器件20所包含的所有显示单元PC,并且所述电源供给线LN上的电压作为反馈电源电压VDDr,经由端子T1而被供给至源极驱动器13。另外,显示电源部21形成在其中形成有源极驱动器13的半导体芯片,或形成在与所述半导体芯片不同的其他半导体芯片。
驱动控制部11接收影像信号VS,从所述影像信号VS中检测水平同步信号并供给至栅极驱动器12。进而,驱动控制部11根据所述影像信号VS,生成包含显示数据片的系列的图像数据信号VPD,所述显示数据片的系列例如以8比特的灰阶表示各显示单元PC各自的亮度级,并将其供给至源极驱动器13。
栅极驱动器12根据水平同步信号,依次对栅极线G1~栅极线Gm的各个择一地施加包含选择脉冲的选择信号,所述选择脉冲具有与逻辑电平0对应的峰值电压。
源极驱动器13针对图像数据信号VPD所包含的显示数据片的系列的一次水平扫描的n个显示数据片的各个,将各显示数据片转换成与所述显示数据片表示的亮度级对应的灰阶电压。而且,源极驱动器13生成具有与n个显示数据片的各个对应的灰阶电压的n个驱动信号,并分别供给至显示器件20的源极线S1~源极线Sn。另外,源极驱动器13形成在单一的半导体芯片、或进行分割而形成在多个半导体芯片。
图3是表示源极驱动器13的内部结构的一例的框图。
如图3所示,源极驱动器13包括:数据锁存部131、数模(Digital Analog,DA)转换部132、灰阶电压生成部133、放大器部134、及输出开关部135。
数据锁存部131针对一次水平扫描的n个显示数据片的各个取入图像数据信号VPD所包含的显示数据片的系列,并作为显示数据P1~显示数据Pn供给至DA转换部132。
灰阶电压生成部133包含基本灰阶电压生成部1330及伽马校正部1331。灰阶电压生成部133通过所述基本灰阶电压生成部1330及伽马校正部1331,生成作为与红色成分对应的实施了伽马校正的256灰阶的红色灰阶电压群的灰阶电压VR0~灰阶电压VR255,并供给至DA转换部132。另外,灰阶电压生成部133生成作为与绿色成分对应的实施了伽马校正的256灰阶的绿色灰阶电压群的灰阶电压VG0~灰阶电压VG255,并供给至DA转换部132。进而,灰阶电压生成部133生成作为与蓝色成分对应的实施了伽马校正的256灰阶的蓝色灰阶电压群的灰阶电压VB0~灰阶电压VB255,并供给至DA转换部132。
另外,灰阶电压生成部133使灰阶电压VR0~灰阶电压VR255、灰阶电压VG0~灰阶电压VG255、及灰阶电压VB0~灰阶电压VB255的各个产生与从显示器件20供给的反馈电源电压VDDr所产生的电压变动相同的电压变动。
DA转换部132针对各显示数据P1~显示数据Pn,从红色灰阶电压群(VR0~VR255)、绿色灰阶电压群(VG0~VG255)或蓝色灰阶电压群(VB0~VB255)中的一个群中选择与显示数据P表示的亮度级对应的灰阶电压。
例如,当显示数据P1表示红色成分的亮度级时,DA转换部132从灰阶电压VR0~灰阶电压VR255之中,选择与由显示数据P1表示的亮度级对应的灰阶电压。另外,当显示数据P2表示绿色成分的亮度级时,DA转换部132从灰阶电压VG0~灰阶电压VG255之中,选择与由显示数据P2表示的亮度级对应的灰阶电压。另外,当显示数据P3表示蓝色成分的亮度级时,DA转换部132从灰阶电压VB0~灰阶电压VB255之中,选择与由显示数据P3表示的亮度级对应的灰阶电压。
DA转换部132将针对各显示数据P1~显示数据Pn,如所述那样进行选择所获得的n个灰阶电压作为灰阶电压A1~灰阶电压An而供给至放大器部134。
放大器部134具有以增益1将灰阶电压A1~灰阶电压An个别地放大的n个放大器(未图示),将从所述n个放大器中输出的n个输出电压作为灰阶电压B1~灰阶电压Bn而供给至输出开关部135。
输出开关部135在开启状态时取入灰阶电压B1~灰阶电压Bn,并将具有灰阶电压B1~灰阶电压Bn的驱动信号D1~驱动信号Dn供给至显示器件20的源极线S1~源极线Sn。
继而,对所述灰阶电压生成部133的结构进行详细说明。
图4是表示灰阶电压生成部133所包含的基本灰阶电压生成部1330及伽马校正部1331的内部结构的电路图。
如图4所示,基本灰阶电压生成部1330包含将电阻r1~电阻r1023串联连接所构成的梯形电阻。配置在所述梯形电阻的前端(末尾)的电阻r1的一端被施加电压值固定的高电压Vtp,配置在所述梯形电阻的末尾(前端)的电阻r1023的一端被施加电压值固定的低电压Vbt(Vtp>Vbt)。
基本灰阶电压生成部1330将施加至电阻r1的一端的高电压Vtp作为与最低亮度对应的基本灰阶电压Vr0来生成,将施加至电阻r1023的一端的低电压Vbt作为与最高亮度对应的基本灰阶电压Vr1023来生成。进而,基本灰阶电压生成部1330将电阻r1~电阻r1023的电阻彼此的连接点的电压作为基本灰阶电压Vr1~基本灰阶电压Vr1022来生成。
基本灰阶电压生成部1330将如所述那样生成的基本灰阶电压Vr0~基本灰阶电压Vr1023供给至伽马校正部1331。
伽马校正部1331包括:红色伽马校正电路GM1、绿色伽马校正电路GM2、以及蓝色伽马校正电路GM3。
红色伽马校正电路GM1在基本灰阶电压Vr0~基本灰阶电压Vr1023之中,选出具有按照红色的伽马特性的电压值的256灰阶的256个基本灰阶电压Vr。红色伽马校正电路GM1将已选出的256灰阶的基本灰阶电压Vr作为与红色成分对应的实施了伽马校正的灰阶电压VR0~灰阶电压VR255而输出。另外,红色伽马校正电路GM1使灰阶电压VR0~灰阶电压VR255产生与反馈电源电压VDDr所产生的电压变动相同的电压变动。
绿色伽马校正电路GM2在基本灰阶电压Vr0~基本灰阶电压Vr1023之中,选出具有按照绿色的伽马特性的电压值的256灰阶的256个基本灰阶电压Vr。绿色伽马校正电路GM2将已选出的256灰阶的基本灰阶电压Vr作为与绿色成分对应的实施了伽马校正的灰阶电压VG0~灰阶电压VG255而输出。另外,绿色伽马校正电路GM2使灰阶电压VG0~灰阶电压VG255产生与反馈电源电压VDDr所产生的电压变动相同的电压变动。
蓝色伽马校正电路GM3在基本灰阶电压Vr0~基本灰阶电压Vr1023之中,选出具有按照蓝色的伽马特性的电压值的256灰阶的256个基本灰阶电压Vr。蓝色伽马校正电路GM3将已选出的256灰阶的基本灰阶电压Vr作为与蓝色成分对应的实施了伽马校正的灰阶电压VB0~灰阶电压VB255而输出。另外,蓝色伽马校正电路GM3使灰阶电压VB0~灰阶电压VB255产生与反馈电源电压VDDr所产生的电压变动相同的电压变动。
另外,红色伽马校正电路GM1、绿色伽马校正电路GM2、及蓝色伽马校正电路GM3除各自的伽马特性不同这一点以外,电路结构相同。
图5是从红色伽马校正电路GM1、绿色伽马校正电路GM2、及蓝色伽马校正电路GM3之中挑选红色伽马校正电路GM1来表示伽马校正电路的内部结构的电路图。
如图5所示,红色伽马校正电路GM1包括:解码器CR0~解码器CR10、变动电压重叠部H0、放大器AM0~放大器AM10、以及将多个电阻串联连接所构成的梯形电阻LDR。
解码器CR0~解码器CR10首先从基本灰阶电压Vr0~基本灰阶电压Vr1023之中,选择与具有按照伽马特性的电压值的特定的11个灰阶分别对应的基本灰阶电压,并将已选择的基本灰阶电压作为代表灰阶电压U而输出。
即,红色伽马校正电路GM1的解码器CR0从基本灰阶电压Vr0~基本灰阶电压Vr1023之中,选择按照红色的伽马特性且与第0灰阶对应的基本灰阶电压,并将其作为代表灰阶电压U0而输出。另外,红色伽马校正电路GM1的解码器CR1从基本灰阶电压Vr0~基本灰阶电压Vr1023之中,选择按照红色的伽马特性且与第一灰阶对应的基本灰阶电压,并将其作为代表灰阶电压U1而输出。另外,红色伽马校正电路GM1的解码器CR2从基本灰阶电压Vr0~基本灰阶电压Vr1023之中,选择按照红色的伽马特性且与第七灰阶对应的基本灰阶电压,并将其作为代表灰阶电压U7而输出。
如此,红色伽马校正电路GM1的解码器CR0~解码器CR10从Vr0~Vr1023之中,选择按照红色的伽马特性且与第0灰阶、第一灰阶、第七灰阶、第11灰阶、第23灰阶、第35灰阶、第51灰阶、第87灰阶、第151灰阶、第203灰阶、及第255灰阶分别对应的11个基本灰阶电压。而且,将与已选择的11个灰阶分别对应的基本灰阶电压作为代表灰阶电压U0、代表灰阶电压U1、代表灰阶电压U7、代表灰阶电压U11、代表灰阶电压U23、代表灰阶电压U35、代表灰阶电压U51、代表灰阶电压U87、代表灰阶电压U151、代表灰阶电压U203及代表灰阶电压U255而个别地输出。
另外,同样地,绿色伽马校正电路GM2的解码器CR0~解码器CR10从Vr0~Vr1023之中,选择按照绿色的伽马特性且与第0灰阶、第一灰阶、第七灰阶、第11灰阶、第23灰阶、第35灰阶、第51灰阶、第87灰阶、第151灰阶、第203灰阶、及第255灰阶分别对应的基本灰阶电压。而且,将与已选择的11个灰阶分别对应的基本灰阶电压作为代表灰阶电压U0、代表灰阶电压U1、代表灰阶电压U7、代表灰阶电压U11、代表灰阶电压U23、代表灰阶电压U35、代表灰阶电压U51、代表灰阶电压U87、代表灰阶电压U151、代表灰阶电压U203及代表灰阶电压U255而个别地输出。
另外,同样地,蓝色伽马校正电路GM3的解码器CR0~解码器CR10从Vr0~Vr1023之中,选择按照蓝色的伽马特性且与第0灰阶、第一灰阶、第七灰阶、第11灰阶、第23灰阶、第35灰阶、第51灰阶、第87灰阶、第151灰阶、第203灰阶、及第255灰阶分别对应的基本灰阶电压。而且,将与已选择的11个灰阶分别对应的基本灰阶电压作为代表灰阶电压U0、代表灰阶电压U1、代表灰阶电压U7、代表灰阶电压U11、代表灰阶电压U23、代表灰阶电压U35、代表灰阶电压U51、代表灰阶电压U87、代表灰阶电压U151、代表灰阶电压U203及代表灰阶电压U255而个别地输出。
所述代表灰阶电压U0、代表灰阶电压U1、代表灰阶电压U7、……、代表灰阶电压U203及代表灰阶电压U255经由用于朝梯形电阻LDR个别地传送各个代表灰阶电压的代表灰阶电压传送线LS,被供给至放大器AM0~放大器AM10各自的非反相输入端子(+)。
放大器AM0~放大器AM10的各个包含自身的输出端子及反相输入端子彼此直接连接的运算放大器,即增益1的电压跟随器(voltage follower)。放大器AM0~放大器AM10以增益1将由各自的非反相输入端子(+)所接收的代表灰阶电压U0、代表灰阶电压U1、代表灰阶电压U7、代表灰阶电压U11、代表灰阶电压U23、代表灰阶电压U35、代表灰阶电压U51、代表灰阶电压U87、代表灰阶电压U151、代表灰阶电压U203及代表灰阶电压U255放大。放大器AM0~放大器AM10将进行了放大的结果作为代表灰阶电压V0、代表灰阶电压V1、代表灰阶电压V7、代表灰阶电压V11、代表灰阶电压V23、代表灰阶电压V35、代表灰阶电压V51、代表灰阶电压V87、代表灰阶电压V151、代表灰阶电压V203及代表灰阶电压V255,施加至梯形电阻LDR所包含的串联电阻群中的11处的电阻的一端。
梯形电阻LDR通过代表灰阶电压V0、代表灰阶电压V1、代表灰阶电压V7、代表灰阶电压V11、代表灰阶电压V23、代表灰阶电压V35、代表灰阶电压V51、代表灰阶电压V87、代表灰阶电压V151、代表灰阶电压V203及代表灰阶电压V255的施加,将串联电阻群中的256处的电阻的一端所产生的电压作为灰阶电压VR0~灰阶电压VR1023而输出。
变动电压重叠部H0包含电容器CQ。电容器CQ的第一电极被施加反馈电源电压VDDr,电容器CQ的第二电极与传送代表灰阶电压U0的代表灰阶电压传送线LS连接。电容器CQ例如具有与如图2所示那样各显示单元PC所包含的驱动信号保持用的电容器CP相同的静电电容、或与电容器CP对应的静电电容。
通过所述结构,变动电压重叠部H0提取反馈电源电压VDDr的急剧的电压变动部分,并使所述电压变动部分与代表灰阶电压U0重叠。由此,变动电压重叠部H0如以下这样抑制伴随电源电压VDD的电压变动的显示器件20的画质劣化。
图6是表示存在伴随电源电压VDD的电压变动而产生画质劣化的担忧的显示图像的形态的一例的图。
在图6所示的显示图像中,在显示器件20的图像区域内,在水平方向上延伸的带状的区域E1以整个亮度范围(亮度级“0”~亮度级“255”)中的最低的亮度级“0”来显示,其他区域以中间的亮度级“128”来显示。即,在显示器件20的图像区域内,源极线Sq(q为2以上且未满n的整数)~源极线Sn与栅极线Gf(f为2以上且未满m的整数)~栅极线Gw(w为比f大且m以下的整数)交叉的区域E1成为亮度级0的黑色显示部。
此处,当进行图6中所示的显示时,栅极驱动器12在由图6的箭头所示的扫描方向上,依次对栅极线G1~栅极线Gm的各个择一地施加如图7所示那样的包含逻辑电平0的选择脉冲SP的选择信号。另外,在栅极驱动器12如图7所示那样依次对栅极线G1~栅极线Gf-1施加选择脉冲SP的期间内,源极驱动器13将与亮度级“128”对应的灰阶电压Y128施加至所有源极线S1~源极线Sn。
而且,如图7所示,栅极驱动器12在时间点t1处,将施加选择脉冲SP的栅极线从栅极线Gf-1切换成栅极线Gf。进而,在此时间点t1处,源极驱动器13使施加至源极线S1~源极线Sn中的源极线Sq~源极线Sn的灰阶电压从与亮度级128对应的灰阶电压Y128转变成与亮度级0对应的灰阶电压Y0。另外,由于各显示单元PC所包含的驱动用的晶体管Q2为p沟道型,因此如图7所示,与最低的亮度级对应的灰阶电压Y0的电压比与中间的亮度级对应的灰阶电压Y128的电压高。
由此,在紧接于图7中所示的时间点t1后,在与源极线Sq~源极线Sn连接的显示单元PC的各个内,经由晶体管Q2而施加至电容器CP的电压从灰阶电压V128转变成灰阶电压V0。于是,因电容器CP的过渡现象而产生如下的电压变动VXa:施加至电源供给线LN的电源电压VDD的电压值如图7所示急剧地增加,其后,逐渐地下降而到达电源电压VDD的原本的恒定电压值BA。
因此,若未设置变动电压重叠部H0,则在与栅极线Gf连接的所有显示单元PC内,如图7所示因电源电压VDD所产生的电压变动VXa,而导致晶体管Q2的栅极·源极间电压Vgs增加。因所述栅极·源极间电压Vgs的增加,而导致比原本的驱动电流大与电压变动VXa对应的部分的驱动电流流入EL元件LD。因此,在此期间内,与栅极线Gf连接的n个显示单元PC各自的EL元件LD以比与经由源极线S所供给的灰阶电压对应的亮度级高的亮度进行发光。
由此,产生如下的画质劣化:在与栅极线Gf对应的一条显示线的显示区域内的特别是图6中所示的区域Ecc中,显示有亮度比周围的区域高的显示线。
因此,为了防止此种伴随电源电压VDD的电压变动VXa的画质劣化,在显示装置100,在伽马校正电路(GM1~GM3)内设置有图5中所示的变动电压重叠部H0。
变动电压重叠部H0例如包含如图5所示那样的电容器CQ。所述电容器CQ的第一电极被施加反馈电源电压VDDr,第二电极被施加11个代表灰阶电压之中具有最大的电压值的代表灰阶电压U0。
因此,若在反馈电源电压VDDr,即电源电压VDD产生如图7所示那样的电压变动VXa,则电容器CQ使代表灰阶电压U0(V0)产生与所述电压变动VXa相同的电压变动。
由此,梯形电阻LDR根据产生了与所述电压变动VXa对应的电压变动的代表灰阶电压V0,生成灰阶电压VR0~灰阶电压VR255(灰阶电压VG0~灰阶电压VG255、灰阶电压VB0~灰阶电压VB255)。因此,在灰阶电压VR0~灰阶电压VR255(灰阶电压VG0~灰阶电压VG255、灰阶电压VB0~灰阶电压VB255)、及使用此种灰阶电压群所生成的驱动信号D1~驱动信号Dn中,在紧接于图7中所示的时间点t1后也产生与电压变动VXa对应的电压变动。因此,在通过驱动信号D1~驱动信号Dn而施加至源极线S1~源极线Sn的各灰阶电压中,如图7所示,也产生与电源电压VDD所产生的电压变动VXa相同的电压变动VXb。
此处,在各显示单元PC内,决定EL元件LD的发光亮度的晶体管Q2的栅极·源极间电压是经由源极线S所供给的灰阶电压与电源电压VDD的电位差。因此,即便如图7所示那样在电源电压VDD产生电压变动VXa,在此期间内,在灰阶电压也产生与其同等的电压变动VXb,因此不论在电源电压VDD是否产生电压变动,晶体管Q2的栅极·源极间电压均变成固定。
例如,在图7中,在对栅极线G1~栅极线Gf-1施加选择脉冲SP的期间内,在电源电压VDD未产生电压变动。因此,在此期间内,作为电源电压VDD与灰阶电压Y128的差值的栅极·源极间电压Vgs1被施加至晶体管Q2,EL元件LD进行亮度级“128”的发光。
其后,如图7所示,若对栅极线Gf施加选择脉冲SP,则在电源电压VDD产生电压变动VXa,伴随于此,在灰阶电压Y128也产生与电压变动VXa相同的电压变动VXb。因此,若求出加上由电压变动VXa所产生的电压增加部分而得的电源电压VDD与加上由电压变动VXb所产生的电压增加部分而得的灰阶电压Y128之间的差值,则由电压变动VXa及电压变动VXb所产生的电压增加部分彼此抵消。因此,即便在电源电压VDD产生电压变动VXa,与未产生电压变动VXa的情况相同的栅极·源极间电压Vgs1也被施加至晶体管Q2,EL元件LD进行亮度级“128”的发光。
因此,根据变动电压重叠部H0,即便产生电源电压VDD暂时地增加的电压变动,也抑制伴随电源电压VDD的增加的显示图像的亮度级增加。由此,抑制如下的画质劣化:伴随电源电压VDD的电压变动,在显示图像中的例如图6所示的区域Ecc中显示有不期望的高亮度的显示线。
进而,变动电压重叠部H0使实施了伽马校正后的代表灰阶电压U0产生电源电压VDD所产生的电压变动。另外,在图5所示的一例中,变动电压重叠部H0通过利用电容器CQ的过渡现象,仅通过所述电容器CQ来使电源电压的电压变动部分与灰阶电压重叠。因此,能够以与现有技术文献中公开的结构相比更小规模的结构,且更良好地抑制画质劣化。
另外,在图5所示的实施例中,通过包含电容器CQ的变动电压重叠部H0,仅使11个代表灰阶电压之中具有最大的电压值的代表灰阶电压U0(V0)产生电压变动。由此,仅通过为一个系统设置变动电压重叠部H0,便可使所有灰阶电压VR0~灰阶电压VR255(灰阶电压VG0~灰阶电压VG255、灰阶电压VB0~灰阶电压VB255)产生与电源电压VDD所产生的电压变动相同的电压变动。
但是,如图8所示,也可以与变动电压重叠部H0一并设置变动电压重叠部H1~变动电压重叠部H10,所述变动电压重叠部H1~变动电压重叠部H10使代表灰阶电压U1、代表灰阶电压U7、代表灰阶电压U11、代表灰阶电压U23、代表灰阶电压U35、代表灰阶电压U51、代表灰阶电压U87、代表灰阶电压U151、代表灰阶电压U203及代表灰阶电压U255产生电压变动。另外,变动电压重叠部H1~变动电压重叠部H10具有与变动电压重叠部H0相同的结构。由此,与采用图5中所示的结构的情况相比,可高精度地使灰阶电压VR0~灰阶电压VR255(灰阶电压VG0~灰阶电压VG255、灰阶电压VB0~灰阶电压VB255)产生与电源电压VDD所产生的电压变动相同的电压变动。
总之,只要设置变动电压重叠部H0即可,所述变动电压重叠部H0使供给至生成256灰阶的灰阶电压的梯形电阻LDR的11个代表灰阶电压中的至少一个产生与电源电压VDD所产生的电压变动相同的电压变动。
另外,在图5所示的实施例中,利用增益1的放大器AM0,将通过变动电压重叠部H0来使代表灰阶电压U0产生电源电压VDD所产生的电压变动放大,由此生成施加至梯形电阻LDR的代表灰阶电压V0。
但是,也可以采用具有如图9所示那样的电路结构的变动电压重叠部H0a来代替图5中所示的变动电压重叠部H0及放大器AM0。
图9中所示的变动电压重叠部H0a包含运算放大器OPA、及具有相同的电阻值的电阻R1~电阻R4。在图9中,从解码器CR0中输出的代表灰阶电压U0经由电阻R1而被供给至运算放大器OPA的非反相输入端子(+)。进而,反馈电源电压VDDr经由电阻R2而被施加至运算放大器OPA的非反相输入端子(+)。作为电源电压VDD的基准的具有恒定电压值BA的基准电源电压VDDC经由电阻R3而被供给至运算放大器OPA的反相输入端子(-)。进而,运算放大器OPA的反相输入端子(-)经由电阻R4而与运算放大器OPA的输出端子连接。
根据图9中所示的结构,使反馈电源电压VDDr与基准电源电压VDDC的差值与代表灰阶电压U0重叠而成的电压作为代表灰阶电压V0,被供给至梯形电阻LDR。即,根据变动电压重叠部H0a,与图5中所示的变动电压重叠部H0同样地,使代表灰阶电压V0产生与电源电压VDD所产生的电压变动相同的电压变动,而作为代表灰阶电压V0供给至梯形电阻LDR。
因此,即便在采用图9中所示的变动电压重叠部H0a来代替图5中所示的变动电压重叠部H0及放大器AM0的情况下,也可以防止伴随电源电压VDD的电压变动的画质劣化。
另外,在图1所示的实施例中,在显示器件20设置端子T1,所述端子T1与将电源电压VDD供给至各显示单元PC的电源供给线LN连接,源极驱动器13从所述端子T1获取与电源电压VDD对应的反馈电源电压VDDr。
但是,如图10所示,也可以将显示电源部21已输出的电源电压VDD供给至显示器件20的端子T0,并且将所述电源电压VDD直接作为反馈电源电压VDDr供给至源极驱动器13。因此,变动电压重叠部H0的电容器CQ通过自身的第一电极来直接接收显示电源部21已输出的电源电压VDD。
另外,在图10所示的结构中,在源极驱动器13的外部设置显示电源部21,但也可以如图11所示,在源极驱动器13内设置显示电源部21。
另外,在所述实施例中,在针对三种颜色(红色、绿色、蓝色)分别设置的伽马校正电路的各个内,个别地设置有图5中所示的变动电压重叠部H0或图9中所示的变动电压重叠部H0a,但也可以设置在由两种颜色或四种颜色以上共有的伽马校正电路内。
另外,在所述实施例中,梯形电阻LDR接收11个代表灰阶电压群,由此生成256灰阶的灰阶电压群,但代表灰阶电压的数量并不限定于11个,另外,生成的灰阶电压的数量,即灰阶数也不限定于256个。
总之,作为驱动显示器件20的源极驱动器13,只要是包含以下的灰阶电压生成部、驱动部、及变动电压重叠部者即可,所述显示器件20包含接收与由显示数据表示的亮度级对应的驱动信号的源极线、及根据电源电压VDD以与驱动信号对应的亮度进行发光的显示单元PC,。
灰阶电压生成部(133)生成按照伽马特性的第一代表灰阶电压~第k(k为2以上的整数)代表灰阶电压(例如U0、U1、U7、…、U255),并根据第一代表灰阶电压~第k代表灰阶电压,生成第一灰阶电压~第N(N为比k大的整数)灰阶电压(例如VR0~VR255)。
驱动部(132、134、135)从第一灰阶电压~第N灰阶电压之中选择与显示数据对应的一个灰阶电压,并将表示已选择的一个灰阶电压的信号作为驱动信号施加至源极线。
变动电压重叠部(H0)当在电源电压(VDD)产生了电压变动时,使第一代表灰阶电压~第k代表灰阶电压中的至少一个(例如U0)产生与电压变动对应的电压变动。

Claims (7)

1.一种半导体装置,是驱动显示器件的半导体装置,所述显示器件包含接收与由显示数据表示的亮度级对应的驱动信号的源极线、及根据电源电压以与由所述源极线所接收的所述驱动信号对应的亮度进行发光的显示单元,所述半导体装置包括:
灰阶电压生成部,生成按照伽马特性的第一代表灰阶电压~第k代表灰阶电压,并根据所述第一代表灰阶电压~所述第k代表灰阶电压,生成第一灰阶电压~第N灰阶电压,其中k为2以上的整数,N为比k大的整数;
驱动部,从所述第一灰阶电压~所述第N灰阶电压之中选择与所述显示数据对应的一个灰阶电压,并将表示已选择的所述一个灰阶电压的信号作为所述驱动信号施加至所述源极线;以及
变动电压重叠部,当在所述电源电压中产生了电压变动时,使所述第一代表灰阶电压~所述第k代表灰阶电压中的至少一个产生与所述电压变动对应的电压变动,其特征在于,
所述变动电压重叠部包括:
运算放大器;
第一电阻,一端被施加所述第一代表灰阶电压~所述第k代表灰阶电压中的一个,另一端与所述运算放大器的非反相输入端子连接;
第二电阻,一端被施加所述电源电压,另一端与所述运算放大器的非反相输入端子连接;
第三电阻,一端被施加作为所述电源电压的基准的基准电源电压,另一端与所述运算放大器的反相输入端子连接;以及
第四电阻,一端与所述运算放大器的反相输入端子连接,另一端与所述运算放大器的输出端子连接。
2.根据权利要求1所述的半导体装置,其特征在于,
所述灰阶电压生成部包括:
基本灰阶电压生成部,生成具有互不相同的电压值的多个基本灰阶电压;
红色伽马校正电路,将所述多个基本灰阶电压之中按照红色用的伽马特性的k个设为红色用的第一代表灰阶电压~第k代表灰阶电压,根据所述红色用的第一代表灰阶电压~第k代表灰阶电压来生成红色用的第一灰阶电压~第N灰阶电压;
绿色伽马校正电路,将所述多个基本灰阶电压之中按照绿色用的伽马特性的k个设为绿色用的第一代表灰阶电压~第k代表灰阶电压,根据所述绿色用的第一代表灰阶电压~第k代表灰阶电压来生成绿色用的第一灰阶电压~第N灰阶电压;以及
蓝色伽马校正电路,将所述多个基本灰阶电压之中按照蓝色用的伽马特性的k个设为蓝色用的第一代表灰阶电压~第k代表灰阶电压,根据所述蓝色用的第一代表灰阶电压~第k代表灰阶电压来生成蓝色用的第一灰阶电压~第N灰阶电压;且
所述变动电压重叠部在所述红色伽马校正电路、所述绿色伽马校正电路、及所述蓝色伽马校正电路的各个中,使所述第一代表灰阶电压~所述第k代表灰阶电压中的至少一个产生与所述电源电压中所产生的电压变动对应的电压变动。
3.根据权利要求1或2所述的半导体装置,其特征在于,包括:
传送所述第一代表灰阶电压~所述第k代表灰阶电压的第一线~第k线,且
所述变动电压重叠部包含电容器,所述电容器自身的第一电极被施加所述电源电压,自身的第二电极与所述第一线~所述第k线中的至少一个连接。
4.根据权利要求3所述的半导体装置,其特征在于,
所述显示单元包括:
发光元件;
保持电容器,通过自身的第一电极来接收由所述源极线所接收的所述驱动信号,第二电极被施加所述电源电压;以及
晶体管,源极被施加所述电源电压,并且栅极被供给所述驱动信号,将对应于所述驱动信号的电流供给至所述发光元件;且
所述变动电压重叠部所包含的所述电容器具有与所述保持电容器的静电电容对应的静电电容。
5.根据权利要求3所述的半导体装置,其特征在于,
所述显示器件包括对多个显示单元分别供给所述电源电压的电源供给线、及与所述电源供给线连接的端子,且
所述电容器的所述第一电极与所述端子连接。
6.根据权利要求1或2所述的半导体装置,其特征在于,
所述变动电压重叠部设置在所述灰阶电压生成部内。
7.根据权利要求1或2所述的半导体装置,其特征在于,
所述变动电压重叠部使所述第一代表灰阶电压~所述第k代表灰阶电压之中,具有最大的电压值的一个代表灰阶电压产生与所述电源电压中所产生的电压变动对应的电压变动。
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