CN103503056A - 图像显示装置的驱动方法 - Google Patents

图像显示装置的驱动方法 Download PDF

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CN103503056A
CN103503056A CN201280019241.XA CN201280019241A CN103503056A CN 103503056 A CN103503056 A CN 103503056A CN 201280019241 A CN201280019241 A CN 201280019241A CN 103503056 A CN103503056 A CN 103503056A
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CN103503056B (zh
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柘植仁志
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Joled Inc
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松下电器产业株式会社
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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 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
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    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G3/3233—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 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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    • G09G3/00—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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
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    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
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    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • G—PHYSICS
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    • G09G2320/04—Maintaining the quality of display appearance
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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

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Abstract

本发明中的像素电路具有：电流发光元件；驱动晶体管；第1电容器；第2电容器；对驱动晶体管的栅极施加基准电压的第1开关；向第1电容器和第2电容器的节点提供图像信号电压的第2开关；向驱动晶体管的源极提供初始化电压的第3开关和将第1电容器短路的第4开关。在初始化期间T1对第2电容器施加基准电压与初始化电压之差的电压。在阈值检测期间T2闭合包括驱动晶体管的电流通路，以降低第2电容器的电压。在写入期间T3对第1电容器施加基准电压与图像信号电压之差的电压。在发光期间T4向电流发光元件流通电流。

Description

图像显示装置的驱动方法
技术领域
本发明涉及使用电流发光元件的有源矩阵式图像显示装置的驱动方法。
背景技术
排列有多个自发光的有机电致发光(以下称为“有机EL”。)元件的有机EL显示装置，因其不需要背光且对视场角度没有限制而被作为下一代的图像显示装置得以推进开发。
有机EL元件是通过流过的电流量来控制亮度的电流发光元件。作为驱动有机EL元件的方式，有无源矩阵方式和有源矩阵方式。前者虽然其像素电路简单但很难实现大型且高清晰的显示。因此，各像素电路配置有驱动晶体管的有源矩阵式的有机EL显示装置最近几年逐渐成为主流。
一般由使用了多晶硅或非晶硅等的薄膜晶体管来形成驱动晶体管及其周边电路。薄膜晶体管虽然有迁移率低且阈值电压随时间老化变化大的缺点，但因其易于大型化且价格便宜而适合于大型的有机EL显示装置。另外，也有研究通过像素电路的改进来克服薄膜晶体管的弱点即阈值电压随时间老化问题的方法。比如专利文献1中公开了具有补正驱动晶体管的阈值电压的功能的有机EL显示装置及其驱动方法。
阈值电压的补正大致如下所述。对驱动晶体管的栅极源极间施加超过阈值电压的电压使电流流过驱动晶体管的同时，对连接于驱动晶体管的栅极源极间的电容器进行放电。这样一来，在电容器的端子间电压成为等于驱动晶体管的阈值电压的时刻，电流将停止流过驱动晶体管。通过将该电容器的端子间电压叠加于图像信号，可以不依赖于驱动晶体管的阈值电压而实现图像的显示。
在此，如果电容器的端子间电压比阈值电压充分地高，则流过驱动晶体管的电流多，可以快速地进行电容器的放电，但随着电容器的端子间电压接近阈值电压，流过驱动晶体管的电流变少，电容器的放电速度变慢。为此，需要非常长的时间才能达到电容器的端子间电压等于驱动晶体管的阈值电压。实践中，比如需要10～100μsec。
然而，由于在专利文献1、2记载的像素电路及其驱动方法中，使用供应图像信号的数据线进行阈值电压的补正动作，因此使可供写入动作的时间变短，难于实现像素数多的大画面的图像显示装置或高清晰的图像显示装置。
在先技术文献
专利文献
专利文献1：日本特开2009-169145号公报
发明内容
本发明公开一种图像显示装置的驱动方法，所述图像显示装置排列有多个像素电路，该像素电路具有：电流发光元件；向电流发光元件流通电流的驱动晶体管；一方的端子与驱动晶体管的栅极连接的第1电容器；连接在第1电容器的另一方的端子与驱动晶体管的源极之间的第2电容器；对驱动晶体管的栅极施加基准电压的第1开关；向第1电容器和第2电容器的节点提供图像信号电压的第2开关；向驱动晶体管的源极提供初始化电压的第3开关；和将第1电容器短路的第4开关。将1帧期间分成初始化期间、阈值检测期间、写入期间和发光期间。在初始化期间，使第2开关为截止状态，使第1开关、第3开关和第4开关为导通状态，从而对第2电容器施加基准电压与初始化电压之差的电压。在阈值检测期间，使第2开关和第3开关为截止状态，使第1开关和第4开关为导通状态，从而闭合包括第2电容器和驱动晶体管的电流通路，以降低第2电容器的电压。在写入期间，使第3开关和第4开关为截止状态，使第1开关和第2开关为导通状态，从而对第1电容器施加基准电压与图像信号电压之差的电压。在发光期间，使第1开关、第2开关、第3开关和第4开关为截止状态，从而对驱动晶体管及电流发光元件流通与图像信号电压相应的电流。
(发明效果)
根据该结构，能够提供可高速地进行写入动作并可以补正驱动晶体管的阈值电压的图像显示装置的驱动方法。
附图说明
图1是表示一实施方式中的图像显示装置的结构的示意图。
图2是该图像显示装置的像素电路的电路图。
图3是表示该图像显示装置的动作的时序图。
图4是表示该图像显示装置的像素电路的动作的时序图。
图5是用于说明该像素电路的初始化期间中的动作的图。
图6是用于说明该像素电路的阈值检测期间中的动作的图。
图7是用于说明该像素电路的写入期间中的动作的图。
图8是用于说明该像素电路的发光期间中的动作的图。
附图参考符号
10图像显示装置  12像素电路  14源极驱动器电路  16栅极驱动器电路  18电源电路  31，32电源线  33，34电压线  D20有机EL元件  Q20驱动晶体管  C21第1电容器  C22第2电容器  Q21晶体管  Q22晶体管  Q23晶体管  Q24晶体管
具体实施方式
下面，结合附图对本发明的一实施方式的图像显示装置予以说明。在此，作为图像显示装置，对使用驱动晶体管使作为电流发光元件之一的有机EL元件发光的有源矩阵式有机EL显示装置进行说明。然而本发明并不局限于有机EL显示装置。本发明可以适用于所有排列有多个像素电路的有源矩阵式图像显示装置，其中，该像素电路具有利用电流量控制亮度的电流发光元件和向电流发光元件流通电流的驱动晶体管。
图1是表示一实施方式中的图像显示装置10的结构的示意图。本实施方式中的图像显示装置10具有被排列成n行m列的矩阵状的多个像素电路12(i，j)(其中：1≤i≤n，1≤j≤m。)、源极驱动器电路14、栅极驱动器电路16和电源电路18。
源极驱动器电路14向图1中排列于列方向上的像素电路12(1，j)～12(n，j)所共同连接的数据线20(j)分别独立地提供图像信号电压Vsg(j)。另外，栅极驱动器电路16向图1中排列于行方向上的像素电路12(i，1)～12(i，m)所共同连接的控制信号线21(i)～24(i)分别提供控制信号CNT21(i)～CNT24(i)。虽然在本实施方式中对一个像素电路12(i，j)供给4种控制信号CNT21(i)～CNT24(i)，但控制信号的数量并不局限于此，供给满足需要数量的控制信号即可。
电源电路18向所有的像素电路12(1，1)～12(n，m)所共同连接的电源线31提供高压侧电压Vdd、向电源线32提供低压侧电压Vss。这些高压侧电压Vdd及低压侧电压Vss的电源是用于使后边将阐述的有机EL元件发光的电源。此外，向所有的像素电路12(i，j)所共同连接的电压线33提供基准电压Vref、向电压线34提供初始化电压Vint。
图2是一实施方式中的图像显示装置10的像素电路12(i，j)的电路图。该实施方式中的像素电路12(i，j)具有：作为电流发光元件的有机EL元件D20、驱动晶体管Q20、第1电容器C21、第2电容器C22、和作为开关工作的晶体管Q21～Q24。
驱动晶体管Q20向有机EL元件D20流通电流。第1电容器C21保持与图像信号相应的图像信号电压Vsg(j)。第2电容器C22保持驱动晶体管Q20的闽值电压Vth。晶体管Q21是用于对第1电容器C21的一方的端子施加基准电压Vref的开关。晶体管Q22是用于对第1电容器C21写入图像信号电压Vsg(j)的开关。晶体管Q23是用于对第2电容器C22的一方的端子施加初始化电压Vint的开关。晶体管Q24是短路第1电容器C21的开关。
另外，在本实施方式中，以驱动晶体管Q20及晶体管Q21～Q24都是N沟道薄膜晶体管且是增强型晶体管来进行说明。然而本发明并不局限于此，各晶体管也可以是P沟道薄膜晶体管或者是耗尽型晶体管。还有，作为开关工作的晶体管Q21～Q24优选在截止状态时的漏电流小并且导通电阻低的晶体管。
本实施方式中的像素电路12(i，j)中，驱动晶体管Q20和有机EL元件D20连接在电源线31与电源线32之间。即，驱动晶体管Q20的漏极与电源线31连接，驱动晶体管Q20的源极与有机EL元件D20的阳极连接，有机EL元件D20的阴极与电源线32连接。
第1电容器C21和第2电容器C22串联连接在驱动晶体管Q20的栅极与源极之间。即，第1电容器C21的一方的端子与驱动晶体管Q20的栅极连接，第1电容器C21的另一方的端子与第2电容器C22的一方的端子连接，第2电容器C22的另一方的端子与驱动晶体管Q20的源极连接。以下分别将连接驱动晶体管Q20的栅极和第1电容器C21的节点称为“节点Tp1”，将连接第1电容器C21和第2电容器C22的节点称为“节点Tp2”，将连接第2电容器C22和驱动晶体管Q20的源极的节点称为“节点Tp3”。
作为第1开关的晶体管Q21的漏极(或者源极)与被供给基准电压Vref的电压线33连接，晶体管Q21的源极(或者漏极)与节点Tp1连接，晶体管Q21的栅极与控制信号线21(i)连接。这样，晶体管Q21对驱动晶体管Q20的栅极施加基准电压Vref。
作为第2开关的晶体管Q22的漏极(或者源极)与节点Tp2连接，晶体管Q22的源极(或者漏极)与提供图像信号电压Vsg的数据线20(j)连接，晶体管Q22的栅极与控制信号线22(i)连接。这样，晶体管Q22向第1电容器C21和第2电容器C22的节点Tp2提供图像信号电压Vsg。
作为第3开关的晶体管Q23的漏极(或者源极)与节点Tp3连接，晶体管Q23的源极(或者漏极)与被供给初始化电压Vint的电压线34连接，晶体管Q23的栅极与控制信号线23(i)连接。这样，晶体管Q23向驱动晶体管Q20的源极提供初始化电压Vint。
作为第4开关的晶体管Q24的漏极(或者源极)与节点Tp1连接，晶体管Q24的源极(或者漏极)与节点Tp2连接，晶体管Q24的栅极与控制信号线24(i)连接。这样，晶体管Q24将第1电容器C21短路。
在此，向控制信号线21(i)～24(i)分别提供控制信号CNT21(i)～CNT24(i)。
如上所述，本实施方式中的像素电路12(i，j)具有：一方的端子与驱动晶体管Q20的栅极连接的第1电容器C21；连接在第1电容器C21的另一方的端子与驱动晶体管Q20的源极之间的第2电容器C22；作为对驱动晶体管Q20的栅极施加基准电压Vref的第1开关的晶体管Q21；作为向第1电容器C21和第2电容器C22的节点Tp2提供图像信号电压Vsg的第2开关的晶体管Q22；作为向驱动晶体管Q20的源极提供初始化电压Vint的第3开关的晶体管Q23；和作为将第1电容器C21短路的第4开关的晶体管Q24。
还有，在本实施方式中，假定有机EL元件D20开始流通电流时的阳极阴极间电压Vled(以下，简记为“电压Vled”。)为1(V)，没有电流流过有机EL元件D20时的阳极阴极间电容为1(pF)左右。另外，假定驱动晶体管Q20的阈值电压Vth为1.5(V)左右、第1电容器C21及第2电容器C22的静电电容为0.5(pF)左右。关于驱动电压，设高压侧电压Vdd＝10(V)、低压侧电压Vss＝0(V)、基准电压Vref＝1(V)、初始化电压Vint＝-1(V)。但是，这些数值依显示装置的规格或各元件的特性而变动，优选根据显示装置的规格或各元件的特性将驱动电压设定为最佳。
下面，对本实施方式的像素电路12(i，j)的动作予以说明。图3是表示一实施方式中的图像显示装置10的动作的时序图。如所示，将1帧期间分成初始化期间T1、阈值检测期间T2、写入期间T3和发光期间T4的各区间来驱动各像素电路12(i，j)的有机EL元件D20。在初始化期间T1将第2电容器C22充电至预定的电压。在阈值检测期间T2检测驱动晶体管Q20的阈值电压Vth并写入第2电容器C22。在写入期间T3，对第1电容器C21写入与图像信号相应的图像信号电压Vsg(j)。而且，在发光期间T4，对驱动晶体管Q20的栅极源极间施加第1电容器C21及第2电容器C22的端子间电压之和，电流流过有机EL元件D20从而使有机EL元件D20发光。
对图1中排列在行方向上的m个的像素电路12(j，1)～12(i，m)所构成的像素行的每个，以相同的定时设定这4个期间，并且设定为不同的像素行之间写入期间T3互相不重叠。这样，通过在一个像素行进行写入动作的期间，在其他的像素行进行写入以外的动作，可以有效地利用驱动时间。
图4是表示一实施方式中的图像显示装置10的像素电路12(i，j)的动作的时序图。另外，在图4中，还表示了节点Tp1～Tp3的电压的变化。下面，将像素电路12(i，j)的动作分成各期间中的动作予以详细地说明。
(初始化期间T1)
图5是用于说明一实施方式中的图像显示装置10的像素电路12(i，j)的初始化期间T1中的动作的图。另外在图5中，分别以开关的记号表示图2的晶体管Q21～Q24。还有，将不流通电流的路径以虚线表示。
在时刻t1，使控制信号CNT22(i)为低电平，从而使晶体管Q22为截止状态，并且使控制信号CNT24(i)、CNT21(i)、CNT23(i)为高电平，从而使晶体管Q24、Q21、Q23为导通状态。这样一来，通过晶体管Q21对节点Tp1施加基准电压Vref，并且通过晶体管Q24对节点Tp2也施加基准电压Vref。还有，通过晶体管Q23对节点Tp3施加初始化电压Vint。
这里的基准电压Vref被设定为低于低压侧电压Vss与电压Vled之和。即，Vref＜Vss+Vled。由此，由于驱动晶体管Q20的源极电压比电压(Vss+Vled)还低，因此在初始化期间T1中有机EL元件D20不发光。
另外，初始化电压Vint被设定为，与基准电压Vref之间的差比驱动晶体管Q20的阈值电压Vth还大。即，Vref-Vint＞Vth。由此，第2电容器C22的端子间被充电至比阈值电压Vth还高的电压(Vref-Vint)。还有，由于驱动晶体管Q20的栅极源极间电压被施加比阈值电压Vth还高的电压(Vref-Vint)，所以电流从高压侧电压Vdd的电源经过驱动晶体管Q20及晶体管Q23流向初始化电压Vint的电源。
另外，在本实施方式中，将初始化期间T1设为1μsec。
(闽值检测期间T2)
图6是用于说明一实施方式中的图像显示装置10的像素电路12(i，j)的阈值检测期间T2中的动作的图。
在时刻t2，使控制信号CNT23(i)为低电平，从而使晶体管Q23为截止状态。此时，因驱动晶体管Q20的栅极源极间被施加第2电容器C22的端子间电压，故电流持续流过驱动晶体管Q20。这样一来，该电流使得第2电容器C22的电荷被放电，第2电容器C22的端子间电压开始下降。但由于第2电容器C22的端子间电压依然比阈值电压Vth高，所以电流虽然是在渐渐地减少但还在持续流过驱动晶体管Q20。因此第2电容器C22的端子间电压逐渐地持续下降。如此，第2电容器C22的端子间电压渐渐地接近阈值电压Vth。而且，在第2电容器C22的端子间电压变成等于阈值电压Vth的时刻，电流不再流过驱动晶体管Q20，第2电容器C22的端子间电压也停止下降。
这里，由于驱动晶体管Q20作为由栅极源极间电压控制的电流源而动作，因此伴随第2电容器C22的端子间电压的下降，流过驱动晶体管Q20的电流也减少。为此，需要很长时间第2电容器C22的端子间电压才能变为大致等于阈值电压Vth。而且，有机EL元件D20的比较大的静电电容被合计到第2电容器C22的静电电容，也成为需要很长时间的主要因素。实践中，与晶体管进行开关动作而使电容器放电的情形相比，需要10～100倍的时间。为此，本实施方式中将阈值检测期间T2设定为10μsec。
(写入期间T3)
图7是用于说明一实施方式中的图像显示装置10的像素电路12(i，j)的写入期间T3中的动作的图。
在时刻t3，数据线20(j)被供给与像素电路12(i，j)要显示的图像信号相应的图像信号电压Vsg(j)。但由于数据线20(j)具有比较大的等价电容，还有数据线20(j)本身也具有一定的阻抗，因此如图4所示，到图像信号电压Vsg(j)稳定为止需要一定的时间。
在图像信号电压Vsg(j)稳定了的时刻t4，使控制信号CNT24(i)为低电平，从而使晶体管Q24为截止状态。随后，使控制信号CNT22(i)为高电平，从而使晶体管Q22为导通状态。由此，节点Tp2成为图像信号电压Vsg(j)，第1电容器C21的端子间被充电至电压(Vref-Vsg)。下面，将该电压(Vref-Vsg)记为图像信号电压Vsg’。
此时，驱动晶体管Q20的栅极源极间被施加第1电容器C21的端子间电压与第2电容器C22的端子间电压之和的电压(Vsg’+Vth)。所以，如果图像信号电压Vsg’＞0，则电流流过驱动晶体管Q20，第2电容器C22的端子间电压下降。
在本实施方式中，虽然将写入期间T3设定为2μsec，但预计到图像信号电压Vsg(j)稳定为止的时间需要1μsec。因此，将使晶体管Q22为导通状态从而对第1电容器C21进行充电的时间设定为1μsec。这样，由于本实施方式中使晶体管Q22为导通状态的時间比较短，因此第2电容器C22的端子间电压基本不下降。
(发光期间T4)
图8是用于说明实施方式中的图像显示装置10的像素电路12(i，j)的发光期间T4中的动作的图。
在时刻t5，使控制信号CNT22(i)为低电平，从而使晶体管Q22为截止状态，使控制信号CNT21(i)为低电平，从而使晶体管Q21为截止状态。这样，节点Tp1～Tp3暂时成为悬浮状态。但由于驱动晶体管Q20的栅极源极间被施加电压(Vsg’+Vth)，所以，源极电压上升，与驱动晶体管Q20的栅极源极间电压相应的电流流过有机EL元件D20。
此时的电流I成为：I＝K·(VGS-Vth)＝K·Vsg’(其中VGS为栅极源极间电压，K为常数。)，不含阈值电压Vth。
如上所述，流过有机EL元件D20的电流不受阈值电压Vth的影响。故流过有机EL元件D20的电流不受驱动晶体管Q20的阈值电压Vth的偏差的影響。另外，即使阈值电压Vth随时间老化等而发生变动，也可以使有机EL元件D20以与图像信号相应的亮度发光。
另外，在发光期间T4之后，还可以根据需要设置非发光期间。可以通过使晶体管Q24、Q21、Q23中的至少一个为导通状态来实现非发光期间。
另外，在阈值检测期间T2中，优选使晶体管Q24为导通状态，但如果可以忽略第1电容器C21的漏电流的话，也可以使晶体管Q24为截止状态。此时，可以共用控制信号CNT24(i)和控制信号CNT23(i)。
如此，在本实施方式中，将1帧期间分成初始化期间T1、阈值检测期间T2、写入期间T3和发光期间T4。在初始化期间T1，使作为第2开关的晶体管Q22为截止状态并且使作为第1开关的晶体管Q21、作为第3开关的晶体管Q23和作为第4开关的晶体管Q24为导通状态，从而对第2电容器C22施加基准电压Vref与初始化电压Vint之差的电压(Vref-Vint)。在随后的阈值检测期间T2，使作为第2开关的晶体管Q22和作为第3开关的晶体管Q23为截止状态并且使作为第1开关的晶体管Q21和作为第4开关的晶体管Q24为导通状态，从而闭合包括第2电容器C22和驱动晶体管Q20的电流通路，以降低第2电容器C22的电压。在随后的写入期间T3，使作为第3开关的晶体管Q23和作为第4开关的晶体管Q24为截止状态并且使作为第1开关的晶体管Q21和作为第2开关的晶体管Q22为导通状态，从而对第1电容器C21施加基准电压Vref与图像信号电压Vsg之差的电压(Vref-Vsg)。并且，在发光期间T4，使作为第1开关的晶体管Q21、作为第2开关的晶体管Q22、作为第3开关的晶体管Q23和作为第4开关的晶体管Q24为截止状态，与图像信号电压Vsg相应的电流流过驱动晶体管Q20和作为电流发光元件的有机EL元件D20，从而使有机EL元件D20发光以显示图像。
如上说明，根据在本实施方式中的图像显示装置的驱动方法，可以不依赖于图像信号电压Vsg(j)来检测驱动晶体管的阈值电压。因此，可以任意设定短缩写入时间T3的长度，只要该写入期间T3的长度是大于等于到图像信号电压Vsg(j)稳定为止的时间与使晶体管Q22为导通状态从而对第1电容器C21充电的时间之和的长度。
如上所述根据本实施方式，可以实现可高速地进行写入动作的多像素数大画面的图像显示装置或高清晰度的图像显示装置。
另外，在本实施方式中所示的电压值等的各数值仅仅是表示了一个例子，优选根据有机EL元件的特性或图像显示装置的规格等将这些数值适当地设定为最佳。
(产业上的可利用性)
本发明作为使用电流发光元件的有源矩阵式图像显示装置的驱动方法是有用的。

Claims (1)

1.一种图像显示装置的驱动方法，所述图像显示装置排列有多个像素电路，该像素电路具有：电流发光元件；向所述电流发光元件流通电流的驱动晶体管；一方的端子与所述驱动晶体管的栅极连接的第1电容器；连接在所述第1电容器的另一方的端子与所述驱动晶体管的源极之间的第2电容器；对所述驱动晶体管的栅极施加基准电压的第1开关；向所述第1电容器和所述第2电容器的节点提供图像信号电压的第2开关；向所述驱动晶体管的源极提供初始化电压的第3开关；和将所述第1电容器短路的第4开关，
所述图像显示装置的驱动方法，其将1帧期间分成初始化期间、阈值检测期间、写入期间和发光期间，
在所述初始化期间，使所述第2开关为截止状态，使所述第1开关、所述第3开关和所述第4开关为导通状态，从而对所述第2电容器施加所述基准电压与所述初始化电压之差的电压；
在所述阈值检测期间，使所述第2开关和所述第3开关为截止状态，使所述第1开关和所述第4开关为导通状态，从而闭合包括所述第2电容器和所述驱动晶体管的电流通路，以降低所述第2电容器的电压；
在所述写入期间，使所述第3开关和所述第4开关为截止状态，使所述第1开关和所述第2开关为导通状态，从而对所述第1电容器施加所述基准电压与所述图像信号电压之差的电压；
在所述发光期间，使所述第1开关、所述第2开关、所述第3开关和所述第4开关为截止状态，向所述驱动晶体管及所述电流发光元件流通与所述图像信号电压相应的电流。
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