CN101312006A - 用于有机el无源矩阵设备的驱动设备 - Google Patents
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Abstract
本发明的目的是提供用于有机EL无源矩阵设备的驱动设备,它以低成本实现了功耗降低并抑制亮度不均匀性。驱动设备(500)包括列驱动器(501)、第一行驱动器(502)、第二行驱动器(503)、存储器(504)以及电源/控制信号输入(505)。有机EL无源矩阵设备(510)的每一个有机EL元件的阳极连接到列驱动器(501)的输出,一行的各阴极一起连接到行驱动器(502)或(503)的输入。在驱动器(500)中,在IC的一外围侧附近设置列驱动器(501),而在与设置列驱动器的外围侧相邻的两个外围侧中的一个附近设置各个行驱动器(502)和(503)。将这三个驱动器封装在单个IC芯片中。
Description
相关申请的交叉引用
本申请基于2007年5月22日提交的日本专利申请第2007-135856号并要求其优先权,其内容通过引用结合于此。
技术领域
本申请涉及用于有机EL无源矩阵设备的驱动设备的,尤其涉及具有两个行驱动器的用于有机EL无源矩阵设备的驱动设备。
背景技术
期望将有机EL设备应用于下一代显示器。无源矩阵系统是使有机EL设备发光的驱动系统中的一种。该系统包括按行和列的电极线矩阵,并驱动排列在这些线的交叉点上的有机EL元件(对应于像素)。
图1示出一般用于驱动无源矩阵系统(在下文中称为有机EL无源矩阵设备)中的有机EL设备的驱动设备。驱动设备100设置有列驱动器101和行驱动器102。有机EL无源矩阵设备110由排列成m列和n行的有机EL元件组成。有机EL元件的阳极连接到列驱动器101的输出;每一行中的有机EL元件的阴极连接到行驱动器102的相应输入。当行驱动器102的阴极线1单独转换为低电位电平时,电流I1,...,Im沿列方向与外部照明信号(图1中未示出)成比例地流动,以使有机EL元件发光。随后,顺序地使行驱动器102的阴极线2至m变为低电位电平,以使有机无源矩阵设备110的一行中的每组有机EL元件发光。该过程被称为顺序扫描。驱动设备100重复该过程以在有机EL无源矩阵设备110上显示预定图案和图像。
由方程式(1)表示用于驱动驱动设备100的电源的最低必要电压Vs。
Vs=V1+V2+V3+Vcm+V4(1)
其中Vci(i=1,2,...,m)是有机EL元件i的阴极端子和连接到阴极端子的行驱动器102的输入端子之间的电压降,而Vcm是从排列在第m列的有机EL元件的阴极端子的电压降。功耗P是电压Vs和电流I的乘积,电流I是驱动电流I1,...,和Im的和。
电压降Vci是由第i列有机EL元件的阴极端子和连接到阴极端子的行驱动器102的输入端子之间的导线(阴极线)中的电阻生成的。如图2所示,通过沿列方向(像素方向)(从i=1至m的方向)移动,电压降Vci增加。为了简化起见,该图示出线性增加,尽管实际上不是严格线性的。设r是相邻像素之间的导线电阻,I是各个像素中的恒定电流,Vcm可由以下方程式(2)表示。
Vcm=Ir+2Ir+3Ir+...+mIr (2)
当施加电源电压Vs时,由于沿列方向(像素方向)的电压差而生成无功功率。无功功率等于图2所示的无功电压V5和电流的乘积。无功功率变得太大,使得随着显示面积的扩大不能忽略它。
例如在2.8英寸QVGA(240RGB像素×320行)中,假设各个行的阴极线的总长度是45mm且铝材料的厚度是100nm,则电阻约是100Ω。当将150μA的电流馈送到每个像素时,电压降Vcm是5.7V,相应的功率等于5.7V×150μA×240×3(RGB),其中的一半是无功功率。因此,在通常所采用的驱动电流由单行驱动器吸收的驱动设备中存在过大的无功功率的问题。
除功率问题外,导线电阻沿像素方向的变化导致亮度不均匀的问题。导线电阻的变化导致像素的建立(building-up)特性变化和发射时间的变化,致使亮度不均匀。
专利文献1公开了一种解决功耗和不均匀亮度的技术,它是通过将类似于行驱动器的阴极扫描电路连接到阴极线的两端子而解决问题的。专利文献2也公开了一种类似的技术,其中提供了扫描线的第一和第二转换机构,该机构类似于行驱动器,且使所选的扫描线(类似于阴极线)接地以减小由于导线电阻引起的显示不均匀性。
图3示出类似于专利文献1和2中公开的驱动设备。驱动设备300配备有列驱动器301和排列在阴极线的两侧的两个行驱动器302和303。
图4示出配备有两个行驱动器的驱动设备中的导线电阻引起的电压降。在阴极电阻中流动的电流被吸收到两个行驱动器,从而沿列方向(像素方向)减小导线电阻的变化,特别是减小阴极线端部的电压降。
例如在2.8英寸QVGA(240RGB像素×320行)中,假设半侧阴极线的总长度约是22.5mm且铝材料的厚度是100nm,则电阻约是50Ω。当将150μA的电流馈送到每个像素时,电压降Vcm是1.4V,相应的功率等于1.4V×150μA×240×3(RGB)。与上述例子相比,无功功率减小到1/4。因为行驱动器中的电压V4减半,所以电源电压可进一步降低。因此,无功功率和功率由于阴极电阻而得到改进。随着沿列方向(像素方向)电压变化的减小,建立特性的变化也减小,以降低亮度不均匀性。
除导线电阻引起的问题外,显示面积的扩大出现了功耗增加的问题。扩大的显示面积缩短了沿各行馈送电流所允许的时间。例如,当由一组列驱动器和一个行驱动器驱动2.8英寸QVGA(240RGB像素×320行)的大尺寸EL无源矩阵设备时,扫描周期是1/320。这要求电流增加以保证期望的亮度,导致有机EL元件的功耗增加。
专利文献3公开采用双扫描系统的驱动设备,其中在显示面积增加的一个芯片上,两个LSI各自结合了一个列驱动器和一个行驱动器。通过利用两个LSI,向各个行馈送电流所允许的时间与一个LSI的情况相比可加倍,将电流抑制在一个低水平。
[专利文献1]
日本未审查专利申请特开第H09-281928号
[专利文献2]
日本未审查专利申请特开第2006-235162号
[专利文献3]
日本未审查专利申请特开第2006-047511号
上述的常规的技术可在某种程度上缓解功耗增加以及由于有机EL无源矩阵设备的扩大引起的不均匀亮度生成的问题。然而,大面积显示器的应用要求进一步改进,以解决这些问题。此外,期望以低成本实现这种改进。
发明内容
鉴于以上的问题实现了本发明,且本发明的目的是提供用于有机EL无源矩阵设备的驱动设备,它以低成本实现了功耗降低并抑制有机EL无源矩阵设备中的亮度不均匀性。
为了实现上述目的,本发明如权利要求1所述提供了一种用于有机EL无源矩阵设备的驱动设备,该有机EL无源矩阵设备具有排列成矩阵形式的多个阳极线和多个阴极线以及排列在所述线的交叉点上的有机EL元件,所述驱动设备包括:一个列驱动器,该列驱动器连接到多个阳极线的一端;以及第一和第二行驱动器,该行驱动器中的一个连接到多个阴极线的一端,而该行驱动器中的另一个连接到多个阴极线的另一端。该列驱动器通过从多个阳极线中选出的阳极线馈送电流。第一和第二行驱动器通过从多个阴极线选出的阴极线吸收由列驱动器馈送的电流。列驱动器、第一行驱动器以及第二行驱动器集成在单个IC中。
本发明如权利要求2所述提供权利要求1所述的用于有机EL无源矩阵设备的驱动设备,其中将列驱动器设置在IC的外围侧附近;以及将第一行驱动器设置在与设置列驱动器的外围侧相邻的一外围侧的附近,而将第二行驱动器设置在与设置列驱动器的外围侧相邻的另一外围侧的附近。
本发明如权利要求3所述提供权利要求1所述的用于有机EL无源矩阵设备的驱动设备,其中,将列驱动器设置在IC的外围侧附近;以及将第一行驱动器转动一个角度并设置在列驱动器的附近和与设置列驱动器的外围侧相邻的一外围侧的附近,而将第二行驱动器转动一个角度并设置在列驱动器的附近和与设置列驱动器的外围侧相邻的另一外围侧的附近。
本发明如权利要求4所述提供一种用于有机EL无源矩阵设备的驱动设备,该驱动设备包括两个局部驱动设备,各所述局部驱动设备分别是由权利要求1、2或3定义的用于有机EL无源矩阵设备的驱动设备中的任一个,并被设置在有机EL无源矩阵设备的阳极线的各个末端区;并且两个局部驱动设备通过导线连接并互相同步地工作,并共同承担对所述有机EL无源矩阵设备上的驱动功能。
本发明如权利要求5所述提供如权利要求1至4中的任一项所述的用于有机EL无源矩阵设备的驱动设备,其中有机EL无源矩阵设备含有至少240RGB像素×至少320行个像素。
本发明提供了一种用于有机EL无源矩阵设备的驱动设备,它通过在阴极线的两端提供两个行驱动器、借助于将列驱动器和两个行驱动器封装在单个IC中以低成本实现了功耗降低并抑制亮度不均匀性。
将参考附图详细描述根据本发明的某些优选实施例。
附图简述
图1示出用于有机EL无源矩阵设备的现有技术驱动设备;
图2示出在图1的驱动设备中电压降和列方向之间的关系;
图3示出用于有机EL无源矩阵设备的另一个现有技术驱动设备;
图4示出在图3的驱动设备中电压降和列方向之间的关系;
图5示出根据本发明的第一实施例用于有机EL无源矩阵设备的驱动设备;
图6示出第一实施例中的修改;
图7示出根据本发明的第二实施例用于有机EL无源矩阵设备的驱动设备。
[附图标记]
100:驱动设备
101:列驱动器
102:行驱动器
110,310:有机EL无源矩阵设备
300:驱动设备
301:列驱动器
302,303:行驱动器
500,600,710,720:驱动设备
501,711,721:列驱动器
502,503,602,603,712,713,722,723:行驱动器
504,714,724:存储器
505,715,725:电源/控制信号输入
510,740:有机EL无源矩阵设备
700:用于两个分离驱动的驱动设备
730:电缆
具体实施方式
(示例1)
图5示出根据本发明的第一实施例的用于有机EL无源矩阵设备的驱动设备。驱动设备500驱动具有m列和n行的有机EL无源矩阵设备510。驱动设备500包括列驱动器501、第一行驱动器502、第二行驱动器503、存储器504以及电源/控制信号输入505。有机EL无源矩阵设备510的每个有机EL元件的阳极连接到列驱动器501的输出,各行的阴极连接到行驱动器502和503的输入。
电源/控制信号输入505从外部接收功率和控制信号,并将功率和控制信号馈送到列驱动器501、第一行驱动器502、第二行驱动器503以及存储器504。例如,功率和信号是用于列驱动器501的电源电压Vs和用于存储器504的写入显示数据。
本实施例的驱动设备的特征在于列驱动器501和行驱动器502和503以如图5所示的安排封装在单个IC中。列驱动器501被设置在IC的一外围侧附近。第一行驱动器502被设置在与设置列驱动器501的外围侧相邻的外围侧附近,而第二行驱动器503被设置在与设置列驱动器501的外围侧相邻的另一外围侧附近。尽管行驱动器的数量从1增加到2是成本增加因素,但由于三个驱动器部分,可通过将三个部分封装在单个单元中来实现低成本。
图6示出此实施例中的驱动设备的修改。除行驱动器外,驱动设备600包括与驱动设备500相同的组件。将第一和第二行驱动器602和603转动一个角度。将每一个驱动器设置在列驱动器501的附近,并在与设置列驱动器501的外围侧相邻的一外围侧的附近。在使用于封装驱动设备的IC的大小限制在与设置列驱动器501的外围侧相邻的外围侧的方向中的情况下,该驱动设备600的构造是有益的。
如上所述,第一实施例(包括修改)的驱动设备通过在阴极线的两端提供两个行驱动器、借助于将列驱动器和两个行驱动器封装在单个IC中以低成本实现了功耗降低并抑制亮度不均匀性。
(示例2)
图7示出根据本发明的第二实施例的有机EL无源矩阵设备的驱动设备。驱动设备700包括第一部分驱动设备710,即示例1的设备;第二部分驱动设备720,即示例1的另一个设备;以及连接第一部分驱动设备710和第二部分驱动设备720的电缆730。第一和第二部分驱动设备710和720被设置在有机EL无源矩阵设备740的阳极线的两端,并通过电缆730互相同步地在两个部分中分别驱动有机EL无源矩阵设备740。
在大尺寸有机EL无源矩阵设备,诸如2.8英寸QVGA(240RGB像素×320行),的情形中,扫描周期变为1/320,且在常规的设备中需要增加电流。然而,如在本发明中,在两个部分中的分别驱动使扫描时间从1/320延长到1/160。结果,与常规的设备相比,用于有机EL元件的驱动的电流可减半,以将功耗降低到一半或更少,仍保证了所需的亮度。此外,还减小了由于阳极电阻引起的电压降以及功耗。
同时,阳极电阻是由于诸如IZO之类的透明电极材料引起的。在2.8英寸设备的情况下,假设阳极线的长度为60mm而IZO的厚度是440nm,电阻约是12kΩ。馈入150μA电流,由于阳极电阻引起的电压降高达1.8V(12kΩ×0.15mA)。当分成两个部分时,该值可减半。
为了在一个画面中形成两个分离的区域,通过电缆730连接两个IC,且上部和下部沿行方向(扫描方向)是同步的,在每一部分中使用列(像素)数据,以使有机EL无源矩阵设备显示。
如上所述,在该第二实施例的驱动设备中,在有机EL无源矩阵设备的阳极线的两端分别设置每个具有两个行驱动器的第一和第二部分驱动设备,并分别驱动有机EL无源矩阵设备。结果,实现了功耗的进一步降低。
Claims (5)
1.一种用于有机EL无源矩阵设备的驱动设备,所述有机EL无源矩阵设备具有排列成矩阵形式的多个阳极线和多个阴极线以及排列在所述线的交叉点上的有机EL元件,所述驱动设备包括:
一个列驱动器,所述列驱动器通过从所述多个阳极线中的选出的阳极线馈入电流并连接到所述多个阳极线的一末端区;以及
第一和第二行驱动器,所述行驱动器吸收由所述列驱动器通过从所述多个阴极线中的选出的阴极线馈入的电流,所述行驱动器中的一个连接到所述多个阴极线的一末端区而所述行驱动器中的另一个连接到所述多个阴极线的另一末端区;
所述列驱动器、所述第一行驱动器以及所述第二行驱动器集成在单个IC中。
2.如权利要求1所述的用于有机EL无源矩阵设备的驱动设备,其特征在于,
将所述列驱动器设置在所述IC的外围侧附近;以及
将所述第一行驱动器设置在与设置所述列驱动器的外围侧相邻的一外围侧的附近,而将所述第二行驱动器设置在与设置所述列驱动器的外围侧相邻的另一外围侧的附近。
3.如权利要求1所述的用于有机EL无源矩阵设备的驱动设备,其特征在于,
将所述列驱动器设置在所述IC的外围侧附近;以及
将所述第一行驱动器转动一个角度并设置在所述列驱动器的附近和与设置所述列驱动器的外围侧相邻的一外围侧的附近,而将所述第二行驱动器转动一个角度并设置在所述列驱动器的附近和与设置所述列驱动器的外围侧相邻的另一外围侧的附近。
4.一种用于有机EL无源矩阵设备的驱动设备,所述驱动设备包括两个局部驱动设备,各所述局部驱动设备分别是由权利要求1、2或3定义的用于有机EL无源矩阵设备的驱动设备中的任一个,并被设置在所述有机EL无源矩阵设备的阳极线的各个末端区;并且两个局部驱动设备通过导线连接并互相同步地工作,并共同承担对所述有机EL无源矩阵设备上的驱动功能。
5.如权利要求1至4中的任一项所述的用于有机EL无源矩阵设备的驱动设备,其特征在于,
有机EL无源矩阵设备含有至少240RGB像素×至少320行个像素。
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JP2007135856A JP2008292588A (ja) | 2007-05-22 | 2007-05-22 | 有機elパッシブマトリックス素子の駆動装置 |
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Cited By (2)
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CN103155202A (zh) * | 2010-10-15 | 2013-06-12 | 全球Oled科技有限责任公司 | 具有多个无源矩阵控制器的芯片显示器 |
CN103400852A (zh) * | 2013-05-23 | 2013-11-20 | 友达光电股份有限公司 | 发光二极管显示面板 |
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US9070323B2 (en) | 2009-02-17 | 2015-06-30 | Global Oled Technology Llc | Chiplet display with multiple passive-matrix controllers |
TWI404011B (zh) * | 2009-03-18 | 2013-08-01 | Pervasive Display Co Ltd | 非揮發性顯示模組及非揮發性顯示裝置 |
US20130120465A1 (en) * | 2011-11-11 | 2013-05-16 | Qualcomm Mems Technologies, Inc. | Systems and methods for driving multiple lines of display elements simultaneously |
CN103854597B (zh) | 2012-11-29 | 2016-08-10 | 利亚德光电股份有限公司 | Led显示器及led控制系统 |
KR102342556B1 (ko) | 2015-07-31 | 2021-12-23 | 엘지전자 주식회사 | 반도체 발광 소자를 이용한 디스플레이 장치 |
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US7145536B1 (en) * | 1999-03-26 | 2006-12-05 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device |
US20060007206A1 (en) * | 2004-06-29 | 2006-01-12 | Damoder Reddy | Device and method for operating a self-calibrating emissive pixel |
GB0421710D0 (en) * | 2004-09-30 | 2004-11-03 | Cambridge Display Tech Ltd | Multi-line addressing methods and apparatus |
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CN103155202A (zh) * | 2010-10-15 | 2013-06-12 | 全球Oled科技有限责任公司 | 具有多个无源矩阵控制器的芯片显示器 |
CN103155202B (zh) * | 2010-10-15 | 2016-06-08 | 全球Oled科技有限责任公司 | 具有多个无源矩阵控制器的芯片显示器 |
CN103400852A (zh) * | 2013-05-23 | 2013-11-20 | 友达光电股份有限公司 | 发光二极管显示面板 |
CN103400852B (zh) * | 2013-05-23 | 2016-02-03 | 友达光电股份有限公司 | 发光二极管显示面板 |
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US20080291137A1 (en) | 2008-11-27 |
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