CN110246461B - 电光装置以及电子设备 - Google Patents
电光装置以及电子设备 Download PDFInfo
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Abstract
提供电光装置以及电子设备,能够使电光装置中的除显示区域以外的部分的大小减小。该电光装置具有:显示区域(112),其具有像素电路(110(m、3n))和与像素电路(110(m、3n))对应的数据线(14(3n));数据线驱动电路,其包含开关部(SW(3n))和解复用器(DM(n)),该数据线驱动电路将与像素电路(110(m、3n))的显示灰度对应的灰度电压输出到数据线(14(3n));以及电容(44),其对从数据线驱动电路输出的灰度电压进行保持,电容(44)设置于显示区域(112)。
Description
技术领域
本发明涉及电光装置以及电子设备。
背景技术
近年来,提出了使用有机发光二极管(以下,称为OLED(Organic Light EmittingDiode))元件等发光元件的各种电光装置。在以往的电光装置中,在扫描线和数据线的交叉处对应地设置有包含发光元件和驱动晶体管的像素电路。在专利文献1中公开了适合驱动细微化后的像素电路的驱动电路。
在专利文献1所公开的技术中,在驱动电路中设置有保持电容,该保持电容对输出到数据线的灰度电压进行保持。因此,保持电容配置在电光装置的除配置有像素电路的显示区域以外的部分中。
专利文献1:日本特开2016-38425号公报
但是,在专利文献1所公开的技术中,由于在显示区域以外的部分中设置有保持电容,所以存在显示区域以外的部分增大之类的问题。
发明内容
为了解决以上课题,本发明的电光装置的特征在于,具有:显示区域,其具有像素电路和与所述像素电路对应的数据线;数据线驱动电路,其将与所述像素电路的显示灰度对应的灰度电压输出到所述数据线;以及第1电容,其对从所述数据线驱动电路输出的灰度电压进行保持,所述第1电容设置于所述显示区域。
根据本方式,起到对灰度电压进行保持的保持电容的作用的第1电容设置于显示区域。因此,根据本方式,与仅在显示区域以外的部分中设置保持电容的现有技术相比,能够使电光装置中的除显示区域以外的部分的面积减小。另外,在仅第1电容不足以作为保持电容的情况下,可以在显示区域以外的部分还设置与第1电容一起发挥出保持电容的作用的电容。即使是这种方式,与仅在显示区域以外的部分中设置保持电容的现有技术相比,也能够使电光装置中的除显示区域以外的部分的面积减小。
也可以是,上述电光装置的特征在于,在所述显示区域中,沿着所述数据线设置有第1布线和被施加固定电位的固定电位线,所述第1电容是所述固定电位线与所述第1布线之间的电容。
根据本方式,由于固定电位线与第1布线之间的布线间电容起到第1电容的作用,所以不需要在显示区域中,在固定电位线与第1布线之间另外设置起到第1电容的作用的电容元件。并且,只要追加固定电位线和第1布线便能够形成第1电容,因此与不追加固定电位线和第1布线而另外在显示区域中形成第1电容的情况相比,能够缩小显示区域的面积。
也可以是,上述电光装置的特征在于,具有:发光元件层,其形成有发光元件;电路层,其形成有所述像素电路;第1金属层,其设置在比所述电路层靠所述发光元件层侧的位置;以及第1布线层,其设置在比所述第1金属层靠所述发光元件层侧的位置,形成有所述第1布线,所述第1电容是所述第1金属层与所述第1布线之间的电容。
根据本方式,第1金属层与第1布线之间的电容起到了第1电容的作用。由于第 1金属层与形成第1布线的第1布线层层叠,所以不需要为了形成第1电容而使显示区域的面积增大,容易使显示区域细微化。
也可以是,上述电光装置的特征在于,在所述第1布线层中形成有被施加固定电位的固定电位线,所述第1电容是所述第1金属层与所述第1布线之间的电容和所述固定电位线与所述第1布线之间的电容。
根据本方式,由于固定电位线与第1布线之间的布线间电容和第1金属层与第1 布线之间的布线间电容这两者起到第1电容的作用,所以能够在显示区域内设置大小足够的保持电容。因此,根据本方式,不需要在显示区域以外的部分中设置与第1 电容一起起到保持电容的作用的电容,与在显示区域以外的部分中设置与第1电容一起起到保持电容的作用的电容的方式相比,能够减小电光装置中的除显示区域以外的部分的面积。
上述电光装置的特征在于,所述数据线驱动电路具有与所述第1布线连接的开关,在所述电路层与所述第1金属层之间具有第2布线层和被施加固定电位的第2 金属层,在所述第2布线层中排列形成有所述数据线和经由所述开关与所述第1布线连接的第2布线,该电光装置具有第2电容,该第2电容由所述数据线和所述第2 布线形成。
根据本方式,第2电容起到了传输保持电容所保持的灰度电压的传输电容的作用,能够对所述像素电路进行耦合驱动。也就是说,根据本方式,在耦合驱动的电光装置中,能够使显示区域以外的部分的面积比以往小。并且,根据本方式,能够通过第1金属层和第2金属层对数据线进行静电屏蔽。
并且,除了电光装置之外,本发明可以在概念上被设为具有该电光装置的电子设备。作为电子设备,典型地可列举头戴显示器(HMD)、电子取景器等显示装置。
附图说明
图1是示出本发明实施方式的电光装置1的结构的立体图。
图2是示出电光装置1的电气结构的图。
图3是示出像素电路110、开关部SW以及解复用器DM的结构例的图。
图4是显示面板10的局部剖视图。
图5是用于说明变形例(1)的图。
图6是用于说明变形例(2)的图。
图7是用于说明变形例(2)的图。
图8是用于说明变形例(3)的图。
图9是用于说明变形例(3)的图。
图10是用于说明变形例(4)的图。
图11是用于说明本发明的头戴显示器300的立体图。
图12是用于说明本发明的个人计算机400的立体图。
标号说明
1:电光装置;10:显示面板;3:控制电路;31:电压生成电路;5:数据线驱动电路;4:扫描线驱动电路;12:扫描线;14:数据线;15、15′、15′A、15′B:第1布线;18:信号线;20:第2布线;16、61、62、63、64和116:供电线;34、 42:传输门;43、45:晶体管;41、44、50:电容;SW:开关部;DM:解复用器; 70:数据信号供给电路;100:显示部;110:像素电路;121:第1晶体管;122:第2晶体管;123:第3晶体管;124:第4晶体管;125:第5晶体管;130:OLED; 132:像素电容;160:中继电极;C01:电路层;M01:第1金属层;M02:第2金属层;L01:第1布线层;L02:第2布线层;R01:反射层;ISO:绝缘层;OL:发光元件层;S01:第1密封层;S02:第2密封层;A01:平坦化层;F:滤色器层; T01:透明基板;300:头戴显示器;400:个人计算机。
具体实施方式
以下,参照附图对用于实施本发明的方式进行说明。但是,在各附图中,各部分的尺寸和比例尺与实际的部分适当不同。并且,由于以下所述的实施方式是本发明的优选的具体例,所以在技术上赋予了优选的各种限定,但只要在以下说明中没有特别限定本发明的内容的记载,则本发明的范围并不限定于这些方式。
<A.实施方式>
图1是示出本发明实施方式的电光装置1的结构的立体图。电光装置1例如是在头戴显示器中显示图像的微显示器。
如图1所示,电光装置1具有显示面板10和对显示面板10的动作进行控制的控制电路3。显示面板10具有多个像素电路和对该像素电路进行驱动的驱动电路。在本实施方式中,显示面板10所具有的多个像素电路和驱动电路形成于硅基板,像素电路使用了作为电光元件的一例的OLED。并且,显示面板10例如被收纳于在显示部开口的框状的壳体82中,并且与FPC(Flexible Printed Circuits:柔性印刷电路) 基板84的一端连接。在FPC基板84上通过COF(Chip On Film:覆晶薄膜)技术安装有半导体芯片的控制电路3,并且在FPC基板84上设置多个端子86而与省略图示的上位电路连接。
图2是示出实施方式的电光装置1的结构的框图。如上述那样,电光装置1具有显示面板10和控制电路3。与同步信号同步地从省略图示的上位电路向控制电路3 提供数字图像数据Video。这里,图像数据Video是指将显示面板10(严格来说是后述的显示部100)所应该显示的图像的像素的显示灰度例如规定为8比特的数据。并且,同步信号是指包含垂直同步信号、水平同步信号以及点时钟信号在内的信号。
控制电路3根据同步信号来生成各种控制信号,并对显示面板10提供该各种控制信号。具体来说,控制电路3将控制信号Ctr1、Ctr2、Gref、/Gini、Gcpl、/Gcpl、Sel(1)、Sel(2)、Sel(3)、/Sel(1)、/Sel(2)、/Sel(3)提供到显示面板10。控制信号Ctr1和Ctr2分别是包含脉冲信号、时钟信号、使能信号等多种信号在内的信号。控制信号Gref是正逻辑的控制信号,控制信号/Gini是负逻辑的控制信号。控制信号Gcpl也是正逻辑的控制信号,控制信号/Gcpl是与控制信号Gcpl为逻辑相反关系的负逻辑的控制信号。控制信号/Sel(1)与控制信号Sel(1)为逻辑相反关系。同样,控制信号/Sel(2)与控制信号Sel(2)为逻辑相反关系,控制信号/Sel(3)与控制信号Sel(3)为逻辑相反关系。另外,有时将控制信号Sel(1)、Sel(2)、Sel (3)统称为控制信号Sel,将控制信号/Sel(1)、/Sel(2)、/Sel(3)统称为控制信号/Sel。电压生成电路31从未图示的电源电路接受电力的提供,对显示面板10提供复位电位Vorst、参考电位Vref以及初始化电位Vini等。
进而,控制电路3根据图像数据Video来生成模拟图像信号Vid。具体来说,在控制电路3中设置有查找表,该查找表是将图像信号Vid所示的电位和显示面板10 所具有的电光元件的亮度对应起来进行存储而得的。而且,控制电路3通过参照该查找表来生成表示与图像数据Video所规定的电光元件的亮度对应的电位的图像信号 Vid,并向显示面板10提供该图像信号Vid。
如图2所示,显示面板10具有显示部100和对该显示部100进行驱动的驱动电路(扫描线驱动电路4和数据线驱动电路5)。在本实施方式中,驱动电路被分割成扫描线驱动电路4和数据线驱动电路5,但也可以将它们一体化为1个电路而构成驱动电路。如图2所示,在显示部100中呈矩阵状地排列有与待显示的图像的像素对应的像素电路110。在图2中省略了详细的图示,但在显示部100中,M行扫描线12 在附图中沿横向(X方向)延伸设置,并且,每3列分成一组的(3N)列数据线14 在附图中图沿纵向(Y方向)延伸设置。各扫描线12和各数据线14以相互保持电绝缘的方式设置。与M行扫描线12和(3N)列数据线14的交叉处对应地设置有像素电路110。因此,在本实施方式中,像素电路110以纵M行×横(3N)列的方式呈矩阵状排列。
这里,M、N均为自然数。为了区分扫描线12和像素电路110的矩阵中的行(row),有时在附图中从上方起依次称为1、2、3、…、(M-1)、M行。同样,为了区分数据线14和像素电路110的矩阵的列(column),有时在附图中从左边起依次称为1、2、 3、…、(3N-1)、(3N)列。这里,为了对数据线14的组进行概括说明,当将1以上的任意整数表示为n时,第(3n-2)列、第(3n-1)列和第(3n)列数据线14属于从左边数的第n个组。与同一行扫描线12和属于同一组的3列数据线14对应的3 个像素电路110分别与R(红)、G(绿)、B(蓝)的像素对应,从而显示出应该由这3个像素显示的彩色图像的1个点。即,在本实施方式中,构成为以加法混色的方式通过与RGB对应的OLED的发光来显示1个点的色彩。
并且,如图2所示,在显示部100中,沿着数据线14设置有(3N)列供电线16。 (3N)列供电线16分别沿纵向延伸,并且以与各扫描线12保持相互电绝缘的方式设置。各供电线16是从电压生成电路31被共同提供规定的复位电位Vorst的固定电位线。为了区分供电线16的列,有时在附图中从左边起依次称为第1、2、3、…、(3N) 列供电线16。第1列~第(3N)列供电线16分别与第1列~第(3N)列数据线14 对应设置。
扫描线驱动电路4根据控制信号Ctr1来生成扫描信号Gwr,该扫描信号Gwr用于在1个帧期间内逐行地依次选择M行扫描线12。在图2中,提供到第1、2、3、…、 M行扫描线12的扫描信号Gwr被分别记作Gwr(1)、Gwr(2)、Gwr(3)、…、Gwr (M-1)、Gwr(M)。另外,除了扫描信号Gwr(1)~Gwr(M)之外,扫描线驱动电路4还逐行地生成与该扫描信号Gwr同步的各种控制信号并提供到显示部100,但在图2中省略了图示。帧期间是指电光装置1显示1卡(coma)图像所需的期间,例如如果同步信号中所包含的垂直同步信号的频率为120Hz,则帧期间是其1个周期的8.3毫秒的期间。
如图2所示,数据线驱动电路5具有:(3N)个开关部SW,它们与(3N)列数据线14分别1对1地对应设置;N个解复用器DM,它们按照构成各组的每3列数据线14来设置;以及数据信号供给电路70。
数据信号供给电路70根据从控制电路3提供的图像信号Vid和控制信号Ctr2,生成数据信号Vd(1)、Vd(2)、…、Vd(N)。即,数据信号供给电路70根据对数据信号Vd(1)、Vd(2)、…、Vd(N)进行时分复用而得的图像信号Vid,生成数据信号Vd(1)、Vd(2)、…、Vd(N)。并且,数据信号供给电路70对与第1、2、…、 N个组对应的解复用器DM分别提供数据信号Vd(1)、Vd(2)、…、Vd(N)。
参照图3对像素电路110、开关部SW以及解复用器DM的结构进行说明。为了概括地示出像素电路110所排列的行,将1以上且M以下的任意的整数表示为m。由于各像素电路110在电气结构上来看是彼此相同的结构,因此,这里,以位于第m 行并且位于第(3n)列的、m行(3n)列的像素电路110为例来进行说明。从扫描线驱动电路4向第m行像素电路110提供扫描信号Gwr(m)、控制信号Gcmp(m)、 Gel(m)。
如图3所示,在显示部100的显示区域112中设置有像素电路110和对像素电路 110提供灰度电压的数据线14。此外,在显示区域112中,沿着数据线14逐列地设置有供电线16和第1布线15。在图3中,m行(3n)列的像素电路110用标号“110 (m,3n)”来表示,第(3n)列数据线14用标号“14(3n)”来表示。与数据线14 同样,在图3中,第(3n)列的第1布线15用标号“15(3n)”来表示,第(3n)列供电线16用标号“16(3n)”来表示。如图3所示,数据线14(3n)和第1布线15 (3n)均与开关部SW连接,像素电路110与数据线14(3n)连接。另外,在图3 中,与数据线14(3n)连接的开关部SW用标号“SW(3n)”来表示,与开关部SW (3n)连接的解复用器DM用标号“DM(n)”来表示。像素电路110(m,3n)包含分别作为P沟道MOS型晶体管的第1晶体管121、第2晶体管122、第3晶体管 123、第4晶体管124和第5晶体管125以及OLED 130和像素电容132。以下,有时将第1晶体管121、第2晶体管122、第3晶体管123、第4晶体管124和第5晶体管125统称为“晶体管121~125”。
第2晶体管122的栅极与扫描线12(在像素电路110(m,3n)的情况下为第m 行扫描线12)电连接。并且,第2晶体管122的源极或漏极的一方与数据线14(3n) 电连接,另一方分别与第1晶体管121的栅极和像素电容132中的一个电极电连接。第2晶体管122作为对第1晶体管121的栅极与数据线14(3n)之间的电连接进行控制的开关晶体管来发挥功能。
第1晶体管121的漏极与供电线116电连接。从未图示的电源电路向供电线116 提供在像素电路110中作为电源的高位侧的电位Vel。第1晶体管121作为使与栅极和漏极间的电压对应的电流在OLED 130中流过的驱动晶体管来发挥功能。
第3晶体管123的源极或漏极的一方与数据线14(3n)电连接,另一方与第1 晶体管121的源极电连接。向第3晶体管123的栅极赋予控制信号Gcmp(m)。第3 晶体管123是用于经由数据线14(3n)和第2晶体管122使第1晶体管121的栅极与源极之间导通的晶体管。也就是说,第3晶体管123作为对第1晶体管121的栅极与源极之间的电连接进行控制的开关晶体管来发挥功能。
第4晶体管124的漏极与第1晶体管121的源极电连接,第4晶体管124的源极与OLED130的阳极电连接。向第4晶体管124的栅极赋予控制信号Gel(m)。第4 晶体管124作为对第1晶体管121的源极与OLED 130的阳极之间的电连接进行控制的开关晶体管来发挥功能。
第5晶体管125的源极或漏极的一方与供电线16(3n)即提供复位电位Vorst的固定电位线电连接,另一方与OLED 130的阳极连接。向第5晶体管125的栅极提供控制信号Gcmp(m)。第5晶体管125作为对供电线16(3n)与OLED 130的阳极之间的电连接进行控制的开关晶体管来发挥功能。
在本实施方式中,显示面板10形成于硅基板,因此设晶体管121~125的基板电位为电位Vel。并且,上述晶体管121~125的源极、漏极也可以根据晶体管121~125 的沟道型、电位的关系来调换。并且,晶体管可以是薄膜晶体管,也可以是场效应晶体管。
像素电容132的一个电极与第1晶体管121的栅极电连接,另一个电极与供电线116电连接。因此,像素电容132作为对第1晶体管121的栅极与漏极之间的电压进行保持的保持电容来发挥功能。另外,作为像素电容132,可以使用寄生在第1晶体管121的栅极处的电容,也可以使用通过在硅基板上用相互不同的导电层夹持绝缘层而形成的电容。
OLED 130的阳极130a是在每个像素电路110中单独设置的像素电极。与此相对,OLED 130的阴极是在所有像素电路110中公共设置的公共电极118,与供电线63连接。向供电线63提供作为固定电位的电位Vct。这里,电位Vct可相当于作为逻辑信号的扫描信号或控制信号的低电平。OLED 130是在上述硅基板上用OLED 130的阳极130a和具有光透过性的阴极夹持着白色有机EL层而形成的元件。并且,在OLED 130的射出侧(阴极侧)叠加有与RGB的任意一个对应的滤色器。另外,也可以对隔着白色有机EL层配置的两个反射层之间的光学距离进行调整而形成腔体构造,从而对从OLED 130发出的光的波长进行设定。在该情况下,可以具有滤色器,也可以不具有滤色器。
当电流从OLED 130的阳极130a流到阴极(公共电极118)时,从阳极130a注入的空穴和从阴极注入的电子在有机EL层复合而生成激子,发出白色光。此时发出的白色光构成为透过与硅基板(阳极)相反的一侧的阴极并经过滤色器的着色而在观察者侧被看到。
如图3所示,解复用器DM(n)是逐列设置的传输门34和电容41的集合体,向构成各组的3列依次提供数据信号。与属于第n个组的(3n-2)、(3n-1)、(3n)列对应的传输门34的输入端相互公共连接,向其公共端子分别提供数据信号Vd(n)。与(3n)列对应的传输门34的输出端经由信号线18(3n)与开关部SW(3n)的输入端连接。在图3中省略了详细的图示,但与(3n-1)列对应的传输门34的输出端经由信号线18(3n-1)与开关部SW(3n-1)的输入端连接,与(3n-2)列对应的传输门34的输出端经由信号线18(3n-2)与开关部SW(3n-2)的输入端连接。
与(3n)列对应的电容41的一个电极与信号线18(3n)连接,与(3n)列对应的电容41的另一个电极与供电线64连接。同样,与(3n-1)列对应的电容41的一个电极与信号线18(3n-1)连接,与(3n-2)列对应的电容41的一个电极与信号线 18(3n-2)连接。与(3n-1)列对应的电容41的另一个电极和与(3n-2)列对应的电容41的另一个电极与供电线64连接。向供电线64提供作为固定电位的电位VSS。这里,电位VSS可相当于作为逻辑信号的扫描信号或控制信号的低电平。
在第n个组中设置于作为左端列的(3n-2)列的传输门34在控制信号Sel(1) 为高电平时(控制信号/Sel(1)为低电平时)接通(导通)。同样,在第n个组中设置于作为中央列的(3n-1)列的传输门34在控制信号Sel(2)为高电平时(控制信号/Sel(2)为低电平时)接通,在第n个组中设置于作为右端列的(3n)列的传输门 34在控制信号Sel(3)为高电平时(控制信号/Sel(3)为低电平时)接通。
开关部SW(3n)具有传输门42、N沟道MOS型晶体管43以及P沟道MOS型晶体管45。在开关部SW(3n)中,传输门42的输入端为该开关部SW(3n)的输入端。开关部SW(3n)的传输门42的输入端与信号线18(3n)连接。信号线18(3n) 的节点h与第1布线15(3n)连接。因此,在解复用器DM(n)中与3n列对应的电容41的一个电极经由信号线18(3n)与第1布线15(3n)连接。传输门42的输出端与数据线14(3n)连接。从控制电路3向传输门42提供控制信号Gcpl和控制信号/Gcpl。传输门42在控制信号Gcpl为高电平时(控制信号/Gcpl为低电平时)接通。当传输门42接通时,信号线18(3n)和在节点h处连接于信号线18(3n)的第1 布线15(3n)与数据线14(3n)电连接。
晶体管45的漏极与数据线14(3n)连接,晶体管45的源极与提供规定的初始化电位Vini的供电线61连接。控制电路3对晶体管45的栅极提供控制信号/Gini。晶体管45在控制信号/Gini为低电平时将数据线14(3n)与供电线61电连接,另一方面,在控制信号/Gini为高电平时不将数据线14(3n)与供电线61电连接。当数据线14(3n)与供电线61电连接时,数据线14(3n)的电位为初始化电位Vini。
晶体管43的漏极与数据线14(3n)连接,晶体管43的源极与提供参考电位Vref 的供电线62连接。参考电位Vref是在对像素电路110的驱动晶体管(即,第1晶体管121)的阈值电压进行补偿的补偿动作中使用的参考电位。向晶体管43的栅极提供控制信号Gref。晶体管43在控制信号Gref为高电平时将数据线14(3n)与供电线62电连接,在控制信号Gref为低电平时不将数据线14(3n)与供电线62电连接。当数据线14(3n)与供电线62电连接时,数据线14(3n)的电位为参考电位Vref。
图3中的电容44是供电线16与第1布线15(3n)之间的布线间电容。当在传输门42断开的状态下传输门34接通时,从传输门34的输出端向信号线18(3n)提供数据信号Vd(n),在电容41和电容44中蓄积有与数据信号Vd(n)所示的灰度电压对应的电荷。也就是说,(3n)列的电容41和电容44起到了对与(3n)列的像素电路110的显示灰度对应的灰度电压进行保持的保持电容的作用。并且,当在电容 41和电容44保持着灰度电压的状态下传输门42接通时,信号线18(3n)和第1布线15(3n)与数据线14电连接,电容41和电容44所保持的灰度电压经由数据线14 (3n)被提供到像素电路110(m,3n)。
在本实施方式中,电容41与传输门34、传输门42、晶体管43和45一起设置在电光装置1的除显示区域112以外的部分(围绕显示区域112的外框区域)中。另一方面,电容44设置于显示区域(即,显示区域112)。如上述那样,(3n)列的电容 44是供电线16(3n)与第1布线15(3n)之间的布线间电容,供电线16(3n)和第 1布线15(3n)被设置成在显示区域112中沿着彼此布线以形成该电容44。
图4是示出利用穿过像素电路110(m,3n-2)、110(m,3n-1)和110(m,3n) 的平面将显示部100剖切的截面的局部剖视图。如图4所示,显示部100是将电路层 C01、第2金属层M02、第2布线层L02、第1金属层M01、第1布线层L01、反射层R01、绝缘层ISO、发光元件层OL、第1密封层S01、平坦化层A01、第2密封层S02、滤色器层F以及透明基板T01层叠起来而构成的。
透明基板T01由玻璃或透明树脂形成。在滤色器层F中设置有上述滤色器。第1 密封层S01和第2密封层S02分别由SiOn形成。在发光元件层OL中形成有OLED 130。在图4中图示了OLED 130的阴极(公共电极118)和阳极130a。在电路层C01 中形成有像素电路110中所包含的晶体管121~125和像素电容132。在图4所示的例子中,作为形成于电路层C01的电路元件的一例,图示了像素电容132和晶体管 121(更准确来说是晶体管121的栅极)。
如图4所示,第1金属层M01设置在比电路层C01靠发光元件层OL侧的位置,第1布线层L01设置在比第1金属层M01靠发光元件层OL侧的位置。如图4所示,供电线16(3n)和第1布线15(3n)形成于第1布线层L01。如上述那样,第(3n) 列的电容44是供电线16(3n)与第1布线15(3n)之间的布线间电容,因此电容 44形成于第1布线层L01。
在电路层C01与第1金属层M01之间形成有第2金属层M02和第2布线层L02,在第2布线层L02中形成有数据线14(3n)。并且,第1金属层M01和第2金属层 M02经由中继电极160来相互连接。向第1金属层M01和第2金属层M02赋予公共的固定电位(在本实施方式中为电位Vel),第1金属层M01和第2金属层M02起到了保护数据线14(3n)不受静电噪声影响的屏蔽层的作用。
在本实施方式中,形成有电容44的第1布线层L01和第1金属层M01堆叠在形成有与像素电路110连接的数据线14的第2布线层L02上,从而使与电容41一起形成保持电容的电容44形成在显示区域112内。在本实施方式中,由于电容41和电容 44承担起对与像素电路110的显示灰度对应的灰度电压进行保持的保持电容的作用,所以与未设置电容44的方式相比能够使电容41减小,能够使显示面板10的外框区域的面积减小。这样,根据本实施方式,能够使电光装置1中的除显示区域112以外的部分的芯片面积减小。
<B.变形例>
以上,对本发明的一个实施方式进行了说明,但也可以对该实施方式施加以下的变形。
(1)在上述实施方式中,将设置有数据线14(3n)的第2布线层L02与设置有供电线16(3n)和第1布线15(3n)的第1布线层L01单独设置。但是,如图5所示,也可以省略第2布线层L02和第2金属层M02而在第1布线层L01中设置供电线16(3n)、数据线14(3n)和第1布线15(3n)。
(2)在上述实施方式中,使供电线16(3n)与第1布线15(3n)之间的布线电容承担起第1电容的作用。但是,如图6所示,也可以使第1金属层M01与第1布线15(3n)之间的电容承担起第1电容的作用。并且,如图7所示,还可以使供电线16(3n)与第1布线15(3n)之间的布线电容、和第1金属层M01与第1布线 15(3n)之间的电容这两者承担起第1电容的作用。并且,在仅第1电容起到了保持电容的作用的情况下,也可以省略电容41。也就是说,上述实施方式的电容41不是本发明的电光装置的必需的结构要素,可以省略。如果省略电容41,则能够使电光装置1中的除显示区域112以外的部分的芯片面积进一步减小。
(3)如图8所示,也可以将图3中的数据线14(3n)分割成数据线14′(3n) 和第2布线20(3n),并在数据线14′(3n)与第2布线20(3n)之间设置电容50 (第2电容),其中,该数据线14′(3n)与像素电路110和晶体管45连接,该第2 布线20(3n)与传输门42的输出端和晶体管43连接。这是因为能够以电容50为传输电容而对像素电路110进行耦合驱动。并且,也可以在第2布线层L02中以沿着数据线14′(3n)的方式设置第2布线20(3n)(参照图9),使数据线14′(3n)与第 2布线20(3n)之间的布线间电容承担起电容50的作用。这是因为能够将耦合驱动时使用的传输电容设置在显示部100的显示区域112内,与将传输电容设置在显示区域112以外的部分的方式相比,能够使显示区域112以外的部分的芯片面积减小。
(4)如图10所示,也可以将图8中的数据线14′上下分割成从第1行到第m行的数据线14′A和从第(m+1)行到第M行的数据线14′B的两段,并且如图10所示,将第2布线20上下分割成经由传输门42A与第1布线15连接的第2布线20A 和经由传输门42B与第1布线15连接的第2布线20B。另外,图10中的电容50A 是数据线14′A与第2布线20A之间的布线间电容,图10中的电容50B是数据线14 ′B与第2布线20B之间的布线间电容。并且,图10中的晶体管43A是对提供参考电位Vref的参考电源(电压生成电路31)与第2布线20A之间的连接或非连接进行切换的晶体管,晶体管43B是对第2布线20B与上述参考电源之间的连接或非连接进行切换的晶体管。图10中的晶体管45A是对提供初始化电位Vini的初始化电源(电压生成电路31)与数据线14′A之间的连接或非连接进行切换的晶体管,晶体管45B 是对数据线14′B与上述初始化电源之间的连接或非连接进行切换的晶体管。
在图10所示的方式中,通过传输门42A和传输门42B的接通或断开的切换,能够对与数据线14′A连接的像素电路110A和与数据线14′B连接的像素电路110B分别独立地进行驱动。例如,在接通传输门42A而进行向像素电路110A写入灰度电压的期间,能够断开传输门42B并且接通晶体管43B而对像素电路110B的驱动晶体管进行阈值电压的补偿动作。在对像素电路110B的驱动晶体管执行补偿动作的期间,数据线14′B的电位会发生变动,但由于数据线14′A与数据线14′B是分离的,所以不会妨碍到灰度电压向像素电路110A的写入。根据图10所示的方式,在向像素电路110A和像素电路110B中的一方写入灰度电压的期间,能够对另一方开始补偿动作,与以往相比能够延长补偿动作的执行期间(补偿期间)。在通常情况下,补偿期间越长,阈值电压的补偿效果越高,因此根据图10所示的方式,能够使显示区域以外的部分的大小减小,并且与以往相比能够提高像素电路中所包含的驱动晶体管的阈值电压的补偿效果。
<C.应用例>
上述实施方式的电光装置能够应用于各种电子设备,尤其适合于要求比2K2K更高精细的图像显示并且要求小型化的电子设备。以下,对本发明的电子设备进行说明。
图11是示出作为采用了本发明的电光装置的电子设备的头戴显示器300的外观的立体图。如图11所示,头戴显示器300具有镜腿310、镜梁320、投射光学系统 301L以及投射光学系统301R。并且,在图11中,在投射光学系统301L的内部设置有左眼用的电光装置(省略图示),在投射光学系统301R的内部设置有右眼用的电光装置(省略图示)。
图12是采用了本发明的电光装置1的移动式的个人计算机400的立体图。个人计算机400具有:电光装置1,其显示各种图像;以及主体部403,其设置有电源开关401和键盘402。另外,作为应用了本发明的电光装置1的电子设备,除了图11 和图12所例示的设备之外,还可列举数字显微镜、数字双筒望远镜、数字静态照相机、摄像机等靠近眼睛配置的电子设备。此外,还能够作为设置于移动电话、智能手机、移动信息终端(PDA:PersonalDigital Assistants:个人数字助理)、汽车导航装置和车载用的显示器(仪表板)等电子设备的显示部来应用。
Claims (6)
1.一种电光装置,其特征在于,该电光装置具有:
显示区域,其具有像素电路和与所述像素电路对应的数据线;
数据信号供给电路,其输出灰度电压;
第1开关元件,其具有与所述数据信号供给电路连接的一端、和另一端;
第1电容,其与所述第1开关元件的所述另一端连接;以及
第2开关元件,其具有与所述第1开关元件的所述另一端和所述第1电容连接的一端、和与所述数据线连接的另一端,
所述第1电容设置于所述显示区域。
2.根据权利要求1所述的电光装置,其特征在于,
在所述显示区域中,沿着所述数据线设置有第1布线和被施加固定电位的固定电位线,
所述第1电容是所述固定电位线与所述第1布线之间的电容。
3.根据权利要求1所述的电光装置,其特征在于,
该电光装置具有:
发光元件层,其形成有发光元件;
电路层,其形成有所述像素电路;
第1金属层,其设置在比所述电路层靠所述发光元件层侧的位置;以及
第1布线层,其设置在比所述第1金属层靠所述发光元件层侧的位置,形成有第1布线,
所述第1电容是所述第1金属层与所述第1布线之间的电容。
4.根据权利要求3所述的电光装置,其特征在于,
在所述第1布线层中形成有被施加固定电位的固定电位线,
所述第1电容是所述第1金属层与所述第1布线之间的电容和所述固定电位线与所述第1布线之间的电容。
5.根据权利要求3所述的电光装置,其特征在于,
在所述电路层与所述第1金属层之间具有第2布线层和被施加固定电位的第2金属层,
在所述第2布线层中排列形成有所述数据线和经由所述第2开关元件与所述第1布线连接的第2布线,
该电光装置具有第2电容,该第2电容由所述数据线和所述第2布线形成。
6.一种电子设备,其中,该电子设备具有权利要求1~5中的任意一项所述的电光装置。
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JP2013105118A (ja) * | 2011-11-16 | 2013-05-30 | Seiko Epson Corp | 電気光学装置、および電子機器 |
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