CN1521712A - 具有使灰度等级控制更便利的功能的显示设备 - Google Patents

具有使灰度等级控制更便利的功能的显示设备 Download PDF

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CN1521712A
CN1521712A CNA031029248A CN03102924A CN1521712A CN 1521712 A CN1521712 A CN 1521712A CN A031029248 A CNA031029248 A CN A031029248A CN 03102924 A CN03102924 A CN 03102924A CN 1521712 A CN1521712 A CN 1521712A
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display device
optical element
transistor
current
light emitting
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��Ұ��һ
野口幸宏
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Sanyo Electric Co Ltd
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    • 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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    • G09G3/22—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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  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

当数据传输晶体管导通时，在驱动晶体管中以数据电压的形式设置应用于数据线DL的亮度数据。由此对应数据电压的电流流向驱动晶体管，并且同时同一电流流向第一电流镜像晶体管。随后，对应第二电流镜像晶体管的驱动能力与第一电流镜像晶体管的驱动能力之比的电流流向第二电流镜像晶体管。

Description

具有使灰度等级控制更便利的功能的显示设备
技术领域
本发明涉及显示设备并尤其涉及改进有源型矩阵型显示设备现实质量的技术。
背景技术
笔记本个人计算机和便携式终端的使用正快速扩展。主要用于该设备的显示器是液晶显示器，但是希望看作为下一代平板显示器的是有机EL(电致发光)显示器。液晶显示设备还是没有解决诸如视角窄和响应速度慢的问题。另一方面，有机EL显示设备不仅克服了LCD这样的缺陷，而且达到了高亮度和高有效性。
它是一种针对这样显示方法的有源矩阵驱动系统。使用该系统的显示器称为有源矩阵显示器，其中多重像素纵向和横向地置于矩阵中，并且对每一像素提供开关元件。通过开关元件把图像数据连续写入每一像素。
当提出了各种像素电路，对于设计实用有机EL显示器的研究和开发现进入前沿阶段。这种电路的一个例子就是在日本专利申请公开文件No.Heill-219146揭示的像素电路，它以下将参照图7简要说明。
该电路包括数据传输晶体管Tr11和驱动晶体管Tr12(它们是两个n沟道的晶体管)、为光学元件的有机发光二极管(下文简称为OLED)、存储电容SC11、扫描线SL、供电线Vdd和输入亮度数据的数据线DL。
该电路工作如下。为了写入OLED 10的亮度数据，扫描线SL转为高电平且数据传输晶体管Tr11导通，并且在驱动晶体管Tr12和存储电容SC11都设置输入到数据线DL的亮度数据。在亮度的时刻，扫描线变为低电平，因而截止了数据传输晶体管Tr11并保持驱动晶体管Tr12的栅极电压，这样OLED 10根据所设置的亮度数据发光。
另一方面，用户迫切需要高质量的显示。事实上，用户希望显示设备具有更多重的灰度等级。然而，这样需要大量的灰度等级意味着必须进行细调控制。换言之，把亮度数据的信号范围分为如此多的级别会产生各级之间更小的信号差别，由此使灰度等级控制更困难。
发明内容
本发明针对以上情况而作，并且其目的在于提供使灰度等级控制更简便的新颖电路。
根据本发明的较佳实施例涉及一种显示设备。该设备包括：光学元件；驱动光学元件的驱动电路；以及转换驱动电路驱动能力的转换电路，其中由转换电路转换的驱动能力工作于光学元件上。这里，假设为光学元件的可以是有机发光二极管或液晶设备，但不仅限于此。
对应于光学元件亮度数据的数据信号需要根据所需灰度等级数量来设置。如果灰度等级数量大，那么各级间数据信号差别就小，这样其控制就变得困难。因此在设置数据信号时使用相对大的信号，而由转换电路转换所述信号，这样就把光学元件的亮度设置为期望值。例如，当亮度级别为10而把数据信号范围设为1V时，每个级别就需要以0.1V为单位的控制。另一方面，当把数据信号的范围设为10V时，每个级别就需要以1V为单位的控制，其控制就变得简便了。
此外，转换电路包括电流镜像电路，并且由电流镜像电路用预定因子乘流经驱动电路的电流后，把所述电流馈送到光学元件。特别地，由于有机发光二极管是电流驱动型光学元件，因此在有机EL显示设备中通过这样的电流镜像电路的控制是有效的。
例如，在电流镜像电路包括晶体管时，就按这些驱动晶体管能力的比值转换流经电路的电流量。这样，如果驱动晶体管能力的比值为10∶1，那么流经这些晶体管的电流比值也是10∶1。一般驱动能力与晶体管的栅极长度成反比并与其栅极宽度成正比。
此外，转换电路进一步包括切断装置，它基本切断流到电流镜像电路的电流，并且通过控制切断装置控制光学元件的亮度。例如，如果电流镜像电路包括两个薄膜晶体管(以下称为TFT)，那么切断装置工作于连接两个栅极的节点。这样，截止这些TFT并且基本切断流到电流镜像电路的电流。这里，它需要切断装置用作开关元件，且例如晶体管用作该目的。
此外，转换电路包括电流支路，并且可把部分流到驱动电路的电流馈送到光学元件。随后，并联电阻元件以根据其电阻值的比值分流。此外，可并联其导通状态电阻值互相不同的晶体管，并且通过导通和截止这些晶体管对电流进行分流。
根据本发明的另一较佳实施例也涉及一种显示设备。该设备通过模拟灰度等级法在驱动器元件中设置亮度数据，并在驱动光学元件的显示设备中提供转换电路以加宽亮度数据的设置范围。
要指出在方法、设备、系统等之间改变的以上描述的结构元件和表述的任意组合或再组合都是有效的并由本实施例包含。
此外，本发明概述不需要描述所有必要特征，这样本发明也是这些所描述特征的子组合。
附图说明
图1根据本发明第一实施例示出一种包括电流镜像电路的像素电路。
图2根据本发明第二实施例示出一种像素电路。
图3根据本发明第三实施例示出一种像素电路。
图4根据本发明第四实施例示出一种像素电路。
图5根据本发明第五实施例示出一种像素电路。
图6根据本发明第六实施例示出一种像素电路。
图7根据常规实践示出一种像素电路。
图8示出了在图5所示的像素电路上的修正像素电路。
图9示出了在图5所示的像素电路上的另一修正像素电路。
图10示出了在图6所示的像素电路上的修正像素电路。
图11示出了在图6所示的像素电路上的另一修正像素电路。
具体实施方式
根据较佳实施例描述本发明，不希望这些实施例限制本发明的范围，而只是对本发明进行示例。在实施例描述的其所有特征和组合不一定对本发明是必不可少的。
在根据本发明的较佳实施例中，把有源矩阵型有机EL显示设备假设为显示设备，并且转换直接转换并流自其中设置亮度数据的驱动器元件的电流以减小流到作为光学元件的OLED的电流。这通过在设置亮度数据时加宽信号范围使得更便于进行灰度等级控制。
第一实施例
根据本发明的第一实施例，提供电流镜像电路控制流到OLED的电流。图1示出了包括电路镜像电路的像素电路。像素包括数据传输晶体管MN1、驱动晶体管MN2、第一电流镜像晶体管MN3、第二电流镜像晶体管MN4、OLED 10和存储电容SC。此外，由同一像素行共用扫描线SL，并且类似地同一像素列也共用数据线DL和供电线Vdd。当数据传输晶体管MN1和驱动晶体管MN2是n沟道TFT时，第一电流镜像晶体管MN3和第二电流镜像晶体管MN4是p沟道TFT。用作开关元件的数据传输晶体管MN1可包括多个TFT并且实现期望驱动能力的其组合是任意的。
数据传输晶体管MN1的栅极连接于扫描线SL，MN1剩余电极的其中之一连接于数据线DL，而剩余电极的另一个连接于驱动晶体管MN2的栅极。第一电流镜像晶体管MN3的栅极和漏极以及第二电流镜像晶体管MN4的栅极连接于驱动晶体管MN2的漏极。第一电流镜像晶体管MN3的源极和第二电流镜像晶体管MN4的源极连接于供电线Vdd。这样，第一电流镜像晶体管MN3和第二电流镜像晶体管MN4组成电流镜像电路。
驱动晶体管MN2的源极接地。驱动晶体管MN2的栅极通过存储电容SC连接于具有固定电位的固定电位线SCL。第二电流镜像晶体管MN4的漏极连接于OLED 10的阳极，而OLED 10的阴极接地。要指出，这里连接于固定电位线SCL的存储电容SC可连接于驱动晶体管MN2的源极所连接的地。此外这里都接地的驱动晶体管MN2的源极和OLED 10的阴极可连接于负电位。
以下说明如上所述构造的电路的工作。当扫描线SL到高电位时，导通数据传输晶体管MN1。从而，在驱动晶体管MN2中以数据电压的形式设置应用于数据线DL的亮度数据。由此对应数据电压的电流流向驱动晶体管MN2，并且同时同一电流流向第一电流镜像晶体管MN3。
通过电流镜像电路的工作，对应第二电流镜像晶体管MN4的驱动能力与第一电流镜像晶体管MN3的驱动能力之比的电流流向第二电流镜像晶体管MN4。例如假设，第一电流镜像晶体管MN3的驱动能力与第二电流镜像晶体管MN4的驱动能力之比为10∶1。那么，流向驱动晶体管MN2的电流的1/10的电流将流向第二电流镜像晶体管MN4，即流向OLED 10。
要指出，这里是n沟道TFT的数据传输晶体管MN1可以是p沟道TFT。此外，在第二电流镜像晶体管MN4之上可提供OLED 10。换言之，根据第一实施例从供电线到地顺序的第二电流镜像极管MN4和OLED 10的通路可由从供电线到地顺序的OLED 10和第二电流镜像极管MN4的通路替代。
第二实施例
根据本发明第二实施例不同于第一实施例，在于驱动晶体管MN2变为p沟道TFT并且在于添加了电位限定晶体管MN5，它把驱动晶体管MN2源极处的电位在把数据电压写入驱动晶体管MN2栅极时确定为供电线Vdd处的电位，如图2所示。电位限定晶体管MN5是p沟道TFT。此外，在驱动晶体管MN2的栅极和源极之间提供存储电容SC。
电位限定晶体管MN5的漏极连接于第一电流镜像晶体管MN3的栅极和漏极以及第二电流镜像晶体管MN4的栅极，而MN5的源极连接于供电线Vdd。电位限定晶体管MN5的栅极连接于控制线CL，而MN5的导通和截止由与扫描线SL互补的信号控制。除此之外该电流的结构都与图1所示的电路相同。
以下说明如上所述构造的电路的工作。当扫描线SL到高电位时，导通数据传输晶体管MN1。同时，控制线CL到低电位且电位限定晶体管MN5导通。从而，驱动晶体管MN2源极处的电位与供电线Vdd的电位相等，并且在驱动晶体管MN2中以数据电压的形式设置应用于数据线DL的亮度数据。此时，第一电流镜像晶体管MN3的栅极和第二电流镜像晶体管MN4的栅极也得到与供电线Vdd相同的电位。这样，第一电流镜像晶体管MN3和第二电流镜像晶体管MN4都截止，这样电流不会流向OLED 10。即OLED 10停止发光。
接着，当扫描线SL到低电位时，截止数据传输晶体管MN1。同时，控制线CL到高电位且电位限定晶体管MN5截止。从而，对应数据电压集的电流流向驱动晶体管MN2，并且同时同一电流也流向第一电流镜像晶体管MN3。通过电流镜像电路的工作，对应第二电流镜像晶体管MN4的驱动能力与第一电流镜像晶体管MN3的驱动能力之比的电流流向第二电流镜像晶体管MN4。
这里，应用于控制线CL的信号(它是与应用于扫描线SL的信号互补的信号)可以是任何信号，以使电位限定晶体管MN5导通同时数据传输晶体管MN1导通。此外，在OLED 10发光期间，其亮度可通过控制控制线CL来控制。OLED10一般显示出随时间而快速退化。尤其是彩色显示设备，对于不同颜色OLED 10的退化进度有所不同，而连续使用可导致损失显示设备的白色平衡。然而，可修正亮度的变化并通过对于每种颜色控制控制线CL来调节白色平衡。
第三实施例
根据本发明第三实施例不同于第一实施例，在于驱动晶体管MN2是p沟道TFT，第一电流镜像晶体管MN3和第二电流镜像晶体管MN4是n沟道TFT，而在第二电流镜像晶体管MN4之上提供OLED 10，如图3所示。根据第三实施例的电路工作与图1所示的第一实施例的电路工作相同，且这里省略其描述。
第四实施例
根据本发明第四实施例不同于第二实施例，在于驱动晶体管MN2是n沟道TFT，第一电流镜像晶体管MN3和第二电流镜像晶体管MN4是n沟道TFT，电位限定晶体管是n沟道TFT，而在第二电流镜像晶体管MN4之上提供OLED10，如图4所示。根据第四实施例的电路工作与图2所示的第二实施例的电路工作相同，且这里省略其描述。
第五实施例
根据第五实施例，流到OLED的电流由互相并联的电阻元件控制。图5示出了具有如此配备电阻元件的电路。像素包括数据传输晶体管MN1、驱动晶体管MN2、第一电阻元件11、第二电阻元件12、OLED 10和存储电容SC。尽管数据传输晶体管MN1是n沟道的TFT，但驱动晶体管MN2是p沟道的TFT。
数据传输晶体管MN1的栅极连接于扫描线SL，MN1剩余电极的其中之一连接于数据线DL，而MN1剩余电极的另一个连接于驱动晶体管MN2的栅极。驱动晶体管MN2的漏极分别连接于第一电阻元件11的其中一个电极和第二电阻元件12的其中一个电极，而MN2的源极连接于供电线Vdd。第一电阻元件11的另一个电极接地。OLED 10的阳极连接于第二电阻元件12的另一个电极，而OLED 10的阴极接地。因此，第一电阻元件11和第二电阻元件12互相并联。
现在，流向驱动晶体管MN2的电流根据第二电阻元件12和OLED 10的电阻值之和与第一电阻元件11的电阻值之比分流。即如果流向驱动晶体管MN2的电流表示为IMN2，第一电阻元件11电阻值表示为R1，第二电阻元件12的电阻值表示为R2，而OLED 10具有的电阻值表示为ROLED，那么流县OLED 10的电流或IOLED可表示为：
IOLED＝IMN2×R1/(R1+R2+ROLED)
因此，通过配置使第一电阻元件11的电阻值R1小于R2+ROLED(它是第二电阻元件12的电阻值R2和OLED 10具有的电阻值ROLED之和)而使IOLED小于IMN2。
第六实施例
根据第六实施例，如图6所示，在第五实施例中提供的两个电阻元件，第一电阻元件11和第二电阻元件12分别由都为n沟道TFT的第一支流晶体管MN6和第二支流晶体管MN7替代。由这两个TFT共用连接于其栅极并控制它们的控制线CL。
这里，如果第一支流晶体管MN6和第二支流晶体管MN7的导通状态电阻值分别表示为R1和R2，那么流经OLED 10的电流与第五实施例中所表示的相同。
如上所示，根据第一到第六实施例，可使实际流到OLED 10的电流小于通过由设置亮度的驱动晶体管MN2直接转换产生的电流。因此，可使待设置的亮度数据范围更宽，并使每个灰度等级的亮度数据更大，由此更便于进行亮度的更细致的分级控制。此外，根据第二和第四实施例，在OLED 10发光期间，流向电流镜像电路的电流由电位限定晶体管MN5控制，这样可控制OLED10的亮度。此外，该亮度控制可以补偿亮度的降级。
根据只是示范性的实施例描述本发明。本领域技术人员可以理解对于每一部件的组合以及它们的操作存在其它各种修改，并且这样的修改包含在本发明范围中。下文将描述这样修改的例子。
在第六实施例中，第一支流晶体管MN6和第二支流晶体管MN7共用控制线CL，但并不限于该安排和配置。例如，可提供独立的控制线，并且可分别控制第一支流晶体管MN6和第二支流晶体管MN7以调节亮度。
由于如上提到的作为有机EL显示设备光学元件的OLED随时间显示显著的退化，它就可提供一种优点以分别控制支流晶体管。例如，当由于OLED退化而无法得到期望亮度时，可通过第二支流晶体管MN7提供更大的电流。这可以补偿亮度降级。类似，可通过对第二实施例的电阻元件使用可变电阻元件补偿亮度降级。
图8是修正例，其中图5示出的置于驱动晶体管MN2和地之间的OLED 10、第一电阻元件11和第二电阻元件12现在置于供电线Vdd和驱动晶体管MN2之间。此外，把驱动晶体管MN2变为n沟道TFT。这些元件之间的配置和连接如下。即，OLED 10的阳极和第一电阻元件11的其中一个电极连接于供电线Vdd。OLED 10的阴极连接于第二电阻元件12的其中一个电极。第一电阻元件11的另一个电极和第二电阻元件12的另一个电极连接于驱动晶体管MN2的漏极。驱动晶体管MN2的源极接地。该修正例的余下结构与图5所示的像素电路结构相同。图8所示的修正电路的工作与图5所示的像素电路的工作相同，且这里省略其描述。
图9是另一修正例，其中在第五实施例的图5所示的像素电路中，把驱动晶体管MN2变为n沟道的TFT，并把作为p沟道TFT的电流切断晶体管MN8串联于驱动晶体管MN2和第二电阻元件12之间。电流切断晶体管MN8用作开关元件，并且MN8的栅极连接于扫描线SL。此外，由于驱动晶体管MN2现在变为n沟道这一事实，就把存储设置于驱动晶体管MN2栅极中的亮度数据的存储电容置于相对第一电阻元件11的接地端的电极和驱动晶体管MN2栅极之间。这样，这里就不再需要置于图5像素电路中的固定电位线SCL。
以下描述图9所示的像素电路的工作。当选择扫描线并且数据传输晶体管MN1导通时，加到数据线DL的数据电压，即亮度数据在驱动晶体管MN2的栅极和存储电容SC中设置。此时，电流切断晶体管MN8在截止状态。这样，电气切断了供电线Vdd和OLED 10之间的路径，以使存储电容和第一电阻元件11所连接的节点为地电位。此外，OLED 10阳极处的电位变为地电位，并初始化OLED 10的亮度数据。
之后，在发光时刻，数据传输晶体管MN1截止，并且电流切断晶体管MN8导通。随后，0LED 10阳极处的电位改变自地电位，但保持存储电容SC的电量。这样，保持在驱动晶体管MN2中设置的栅源电压，即亮度数据，并且期望的电流流经驱动晶体管MN2。
这里，电流切断晶体管MN8连接于扫描线SL并由其选择信号控制导通截止。然而，电流切断晶体管MN8可由不同控制信号控制。在这样的情况下，电流切断晶体管MN8的极性可以是n沟道或p沟道。然而，此时电流切断晶体管MN8的导通持续时间需要包含并覆盖数据传输晶体管MN1导通持续时间，即设置亮度数据的时间。注意电流切断晶体管MN8放置的位置是任意的，只要MN8放置在供电线Vdd与OLED 10之间。例如电流切断晶体管MN8可设置在第二电阻元件12和OLED 10之间，或供电线Vdd和驱动晶体管MN2之间。
图10示出了在图6所示的像素电路上的修正像素电路。即，在驱动晶体管MN2和地电位之间以及驱动晶体管MN2和OLED 10之间放置的第一和第二支流晶体管现在置于供电线Vdd和驱动晶体管MN2之间，如图10所示。此外，先把第一和第二支流晶体管MN6和MN7变为p沟道TFT，并把第一和第二支流晶体管MN6和MN7的栅极连接于控制线CL。OLED 10的阳极和第一支流晶体管MN6剩余电极之一连接于供电线Vdd，而OLED 10的阴极连接于第二支流晶体管MN7剩余电极之一。第一支流晶体管MN6另一剩余电极和第二支流晶体管MN7另一剩余电极分别连接于驱动晶体管MN2的漏极。这样，以这样顺序连接的OLED 10、第二支流晶体管MN7和驱动晶体管MN2形成从供电线到地电位的串联通路，而第一支流晶体管MN6形成对OLED 10和第二支流晶体管MN7的并联通路。图10所示像素电路的工作与图6所示的像素电路的工作相同。
图11是另一修正像素电路，其中，在第六实施例的图6所示的像素电路中，把驱动晶体管MN2从p沟道的TFT变为n沟道的TFT，而存储电容SC置于驱动晶体管MN2的栅极和OLED 10的阳极之间。这样，这里不需要固定电位线SCL。
以下描述图11所示的像素电路的工作。当选择扫描线并且数据传输晶体管MN1导通时，加到数据线DL的数据电压，即亮度数据在驱动晶体管MN2的栅极和存储电容SC中设置。此时，控制线CL在切断状态，并且OLED 10阳极处的电位降至由OLED 10时间常数和就在这之前的电位所确定的电位。之后，在发光时刻，数据传输晶体管MN1截止，并且控制线CL变为高电平。随后，OLED 10阳极处的电位改变自地电位，但保持存储电容SC的电量。这样，保持在驱动晶体管MN2中设置的栅源电压，即亮度数据，并且期望的电流流经驱动晶体管MN2。流经OLED 10的电流与第六实施例中的相同。
注意第一支流晶体管MN6和第二支流晶体管MN7可以是n沟道TFT。在这样的情况下，这两个TFT的栅极可连接于扫描线SL并可由扫描线SL的选择信号控制导通截止。
此外，虽然在图5和图6所示的像素电路中存储电容SC的电极之一连接于专用的固定电位线SCL，其配置和连接并不限于此且它可连接于供电线Vdd。此外，在图8和图10所示的像素电路中，连接于固定电位线SCL的存储电容SC的电极之一可连接于地电位，它是驱动晶体管MN2的源极处的电位。在此处的任意情况下，都不需要固定电位线SCL。
虽然通过示范实施例描述了本发明，但本领域的技术人员应该理解可进行许多进一步的变化和替换，而不离开由所附权利要求书限定的本发明范围。

Claims (20)

1.一种显示设备，包括：
光学元件；
驱动所述光学元件的驱动电路；以及
转换所述驱动电路驱动能力的转换电路，
其中由所述转换电路转换的驱动能力工作于所述光学元件上。
2.按权利要求1所述的显示设备，其特征在于所述转换电路包括电流镜像电路，并且其中由电流镜像电路用预定因子乘流经所述驱动电路的电流后，电流流向所述光学元件。
3.按权利要求2所述的显示设备，其特征在于所述转换电路进包括切断装置，它基本切断流到电流镜像电路的电流，并且通过控制切断装置控制所述光学元件的亮度。
4.按权利要求1所述的显示设备，其特征在于所述转换电路包括电流支路，它把部分流向所述驱动电路的电流送到所述光学元件。
5.一种显示设备，该设备通过模拟灰度等级法在驱动器元件中设置亮度数据，并包括转换电路，它在驱动光学元件的显示设备中加宽亮度数据的设置范围。
6.按权利要求1所述的显示设备，其特征在于所述驱动电路包括薄膜晶体管。
7.按权利要求2所述的显示设备，其特征在于所述驱动电路包括薄膜晶体管。
8.按权利要求3所述的显示设备，其特征在于所述驱动电路包括薄膜晶体管。
9.按权利要求4所述的显示设备，其特征在于所述驱动电路包括薄膜晶体管。
10.按权利要求5所述的显示设备，其特征在于所述驱动电路包括薄膜晶体管。
11.按权利要求1所述的显示设备，其特征在于所述光学元件是有机发光二极管。
12.按权利要求2所述的显示设备，其特征在于所述光学元件是有机发光二极管。
13.按权利要求3所述的显示设备，其特征在于所述光学元件是有机发光二极管。
14.按权利要求4所述的显示设备，其特征在于所述光学元件是有机发光二极管。
15.按权利要求5所述的显示设备，其特征在于所述光学元件是有机发光二极管。
16.按权利要求6所述的显示设备，其特征在于所述光学元件是有机发光二极管。
17.按权利要求7所述的显示设备，其特征在于所述光学元件是有机发光二极管。
18.按权利要求8所述的显示设备，其特征在于所述光学元件是有机发光二极管。
19.按权利要求9所述的显示设备，其特征在于所述光学元件是有机发光二极管。
20.按权利要求10所述的显示设备，其特征在于所述光学元件是有机发光二极管。
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