CN1979617B - 电源电路,显示装置,电子装置与电力传送方法 - Google Patents
电源电路,显示装置,电子装置与电力传送方法 Download PDFInfo
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Abstract
本发明提供一电源电路以及其制造方法。电源电路提供电压给一显示器中的多个像素驱动电路,包括一电源轨以及多个像素电源线。电源轨包括一第一导电材料,设置在显示器的一像素阵列外围,而直流电压即通过电源轨导入该等像素电源线。该等像素电源线包括一第二导电材料,设置在像素阵列之中,平行排列,各对应耦接一列像素驱动电路,并与电源轨相接,接受直流电压以驱动该等像素驱动电路。该等像素驱动电路则根据一扫描信号和一数据信号而发光。
Description
技术领域
本发明关于显示器的电源电路。
背景技术
主动式矩阵有机发光二极管(AMOLED)显示器已广泛应用于现今。相较于主动式矩阵液晶显示器(AMLCD),AMOLED显示器拥有许多优点,例如较高的对比,视角,较薄的体积,较少的耗电和成本。AMLCD是受到电压驱动,而AMOLED则需要电流源来驱动发光装置。发光装置的亮度正比于电流大小。因此电流上的误差将严重影响AMOLED显示器的发光均匀度。
图1为传统的显示器中的电源电路100。显示器中的一象素驱动电路阵列是由电源电路100提供电力。电源电路100包括一电源轨102和多个条象素电源线104平行排列。一固定直流电压经由电源轨102,由外部(未图示)输入。电源轨102和象素电源线104是由钼/铝/钼(Mo/Al/Mo)迭层组成,用以传导直流电压至该象素驱动电路阵列(未示出)。
图2为图1电源电路100的等效电路。电源轨102和象素电源线104中的等效电阻即为电源轨202和象素电源线204。从电源轨202流入象素电源线204的电流经过该等电阻,结果导致在到达象素驱动电路之前即产生了电压降,严重的影响了AMOLED的亮度均匀性。
发明内容
本发明的一实施例,提供一电源电路。电源电路包括一电源轨以及多个象素电源线,用以提供电压给一显示器中的多个象素驱动电路。电源轨包括一第一导电材料,设置在显示器的一象素阵列外围,而直流电压即通过电源轨导入该等象素电源线。该等象素电源线包括一第二导电材料,设置在象素阵列之中,平行排列,各对应耦接一列象素驱动电路,并与电源轨相接,接受直流电压以驱动该等象素驱动电路。该等象素驱动电路则根据一扫描信号和一数据信号而发光。
在本发明另一实施例中,一显示面板包括上述电源电路,一象素阵列,一栅极驱动器以及一源极驱动器。象素阵列包括一象素驱动电路,可补偿电源轨上因电压降产生的问题,并避免晶体管制作工艺误差造成的亮度不均匀。
更进一步的实施例中,公开了以钼铝钼迭层结构制成的多个条象素电源线,平行排列于一基板上。在基板上,以铜或银形成一电源轨,部份迭盖于该等象素电源在线,具有连结垫用以从外部将直流电压传导至该等象素电源线。
附图说明
图1为传统显示器中的电源电路;
图2为图1电源电路的等效电路;
图3a为本发明实施例的电源电路;
图3b为本发明另一实施例的电源电路;
图3c为本发明实施例的显示面板;
图4为图3c中线段4-4的切面图;
图5a为一象素驱动电路的实施例;
图5b为图5a的信号时序图;
图6为根据本发明所提出的显示装置示意图;以及
图7为根据本发明所提出的电子装置,包括图6的显示装置。
主要组件符号说明
100电源电路 102电源轨
104象素电源线 200等效电路
202电源轨 204象素电源线
300电源电路 302电源轨
304象素电源线 301电源电路
306电源轨 308象素阵列
310栅极驱动器 312源极驱动器
320显示面板 330基板
332半导体层 334绝缘层
338栅极层 2控制器
3显示装置 4输入装置
5电子装置
具体实施方式
图3a为电源电路300的实施例,提供电压至一显示器中的多个象素驱动电路。电源电路300包括一电源轨302和多个条象素电源线304。电源轨302可以是由第一导电材料组成,用以从外部传导一固定直流电压至显示器。象素电源线304可以是由第二导电材料组成,耦接电源轨302使直流电压施加于每一象素驱动电路。第一导电材料的导电度高于第二导电材料的导电度,因此在电源轨302上消耗的电压降可以减低。以铜为基准,下列金属的相对导电度如下:银106%,铜100%,铝61%,钼36.1%。整体来说,铜银合金的导电度优于钼和铝,大约1.6到3.2倍。因此,相对于传统架构,电压在本发明的电源轨102上传送时,在到达象素电源线104之前所损耗的电压降可以减低不少,增进了AMOLED显示器的画面亮度均匀度。第一导电材料可以是铜、银或铜银合金。而第二导电材料可以是钼、铝或钼铝钼迭层结构。如图3a所示,在本实施例中该等象素电源线304是纵向平行排列。然而本发明不限定于此,其它的排列方式亦有可能。
图3b为另一电源电路301的实施例,其中象素电源线304平行排列,而电源轨306形成一个倒U型。面板结构的制造方法采用传统技术,在此不加说明。
图3c为本发明的实施例的显示面板320,包括一电源电路,一象素阵列308,一栅极驱动器310和一源极驱动器312。电源电路包括一电源轨302,设置在象素阵列308外围。多个条象素电源线304散布于象素阵列308的内部。象素阵列308包括多个象素驱动电路如TFT,多个条扫描线和数据线,受到电源电路300提供的直流电压而驱动。象素驱动电路可以是传统的电路,不在本发明重点之内。栅极驱动器310提供扫描信号至象素阵列308,而源极驱动器312提供数据信号至象素阵列308。该等象素电源线304平行地排列,各耦接象素阵列308中一对应的列,而象素阵列308中每一象素驱动电路受到直流电压的驱动,根据数据信号,随着扫描信号而发光。
图4为图3c中线段4-4的剖面图,用以详细表示图3c本发明实施例中未能显示的细节。在图4中,一半导体层332如多硅晶层,一绝缘层334,一栅极层338和一象素电源线304依序形成于一基板330上。半导体层332、绝缘层334和栅极层338的结构与传统无异,不再详述。在象素电源线304中的第一金属可以是钼和铝,形成于绝缘层334上并耦接半导体层332。一电源轨302以金属铜、银或铜银合金组成,形成于象素电源线304上。一绝缘膜(未图示)以氧化硅或氮化硅组成,亦可形成于电源轨302和象素电源线304之间。
图5a显示一改良的象素驱动电路,以补偿电源轨的电压降效应以及晶体管临界电压的误差。在象素驱动电路中,直流电压Vdd耦接系图3c中的象素电源线304。象素驱动电路包括一储存电容Cst,具有端点Va和Vb。一多任务电路M1耦接端点Va,在一第一扫描信号下降时输入数据信号,而在第二扫描信号上升时输入一可变参考信号。一参考信号产生器M5耦接多任务电路M1,用以产生可变参考信号。一晶体管M2(例如二极管驱动单元)耦接端点Vb,在第一扫描信号下降时(如图5b中扫描信号SCAN的下降边缘)且第二扫描信号上升(图5b中扫描信号SCAN上升边缘)时,晶体管M2将直流电压Vdd和晶体管M2的临界电压Vth从一象素电源线耦接至端点Vb。一切换组件M3耦接至晶体管M2,当第一扫描信号上升时,从直流电压Vdd提供驱动电流,经由晶体管M2传至发光装置。
图5b为扫描信号SCAN和参考信号VD的时序图。当扫描信号SCAN下降,多任务电路M1和M4开启,切换组件M3和参考信号产生器M5关闭。端点Va的电位是VDATA,而端点Vb的电位是Vdd-Vth。其中临界电压Vth是晶体管M2的临界电压。当扫描信号SCAN上升,多任务电路M1和M4关闭,而切换组件M3和参考信号产生器M5开启。因此端点Va的电位是0,而端点Vb的电位是Vdd-VDATA+Vth。流过发光装置的电流可表示如下:
I=K(Vdd-Vb-Vth)2
=K(Vdd-Vdd+VDATA-Vth+Vth)2
=KVDATA2
因此,发光装置的电流系独立于晶体管M2的临界电压Vth和直流电压Vdd之外。
图6为本发明实施例的一显示装置3,包括上述实施例的显示面板。如第3c所述的显示面板320可耦接至一控制器2以控制显示面板320显示影像。
图7为本发明实施例的一电子装置5,包括图6所述的显示装置3。一输入装置4耦接至控制器2,包括一处理器用以输入数据至控制器2,以产生影像。电子装置5可以是一可携式装置例如PDA,笔记本计算机,桌上计算机,手机...等。
Claims (12)
1.一电源电路,用以提供直流电压给一显示器中的多个象素驱动电路,包括:
一电源轨,包括一第一导电材料,设置在该显示器的一象素阵列外围;以及
多个象素电源线,包括一第二导电材料,设置在该象素阵列之中,并与该电源轨相接;其中该第一导电材料的导电系数高于该第二导电材料的导电系数;其中
该多个象素电源线平行排列,各对应耦接一列象素驱动电路;以及
每一象素驱动电路根据一扫描信号和一数据信号,由直流电压驱动;
该象素驱动电路包括:
一储存电容,具有一第一端和一第二端;
一PMOS,耦接该第一端,当该扫描信号下降时,传送数据信号至该第一端;
一NMOS,耦接该第一端,当该扫描信号上升时,使所述第一端降为0伏;
一二极管驱动单元,耦接该第二端,当该扫描信号下降时,将直流电压和该二极管驱动单元的临界电压传送至该第二端;以及
一切换组件,耦接至该二极管驱动单元以及一发光二极管,当该扫描信号上升时开启;其中当所述切换组件开启时,该二极管驱动单元根据该第二端上的电压产生一驱动电流而使所述发光二极管发光。
2.根据权利要求1所述的电源电路,其特征在于,该第一导电材料的导电系数是该第二导电材料的导电系数的1.6至3.2倍。
3.根据权利要求1所述的电源电路,其特征在于,该第一导电材料是铜、银或铜银合金其中之一。
4.根据权利要求1所述的电源电路,其特征在于,该第二导电材料是钼、铝或钼铝钼迭层结构其中之一。
5.根据权利要求1所述的电源电路,其特征在于,该多个象素电源线纵向并列,而该电源轨的形状形成一回路,与该多个象素电源线有部份重迭。
6.根据权利要求1所述的电源电路,其特征在于,该多个象素电源线横向并列,而该电源轨的形状形成一U形,与该等象素电源线有部份重迭。
7.一显示装置,包括:
根据权利要求1所述的一电源电路,提供一直流电压至多个象素驱动电路;
一象素阵列,包括该多个象素驱动电路;
一栅极驱动器,提供扫描信号至该象素阵列;以及
一源极驱动器,提供数据信号至该象素阵列。
8.根据权利要求7所述的显示装置,其特征在于,该第一导电材料为铜、银或铜银合金其中之一。
9.根据权利要求7所述的显示装置,其特征在于,该第二导电材料为钼、铝或钼铝钼迭层结构其中之一。
10.一电子装置,包括:
根据权利要求7所述的一显示装置;
一电源供应器,提供一直流电压至该电源电路;以及
一输入装置,提供数据信号至该显示装置以供显示。
11.根据权利要求10所述的电子装置,其特征在于,该第一导电材料为铜、银或铜银合金其中之一。
12.根据权利要求10所述的电子装置,其特征在于,该第二导电材料为钼、铝或钼铝钼迭层结构其中之一。
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US11/295,210 | 2005-12-05 | ||
US11/295,210 US20070126728A1 (en) | 2005-12-05 | 2005-12-05 | Power circuit for display and fabrication method thereof |
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CN1979617B true CN1979617B (zh) | 2010-10-06 |
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US20080018847A1 (en) * | 2006-07-21 | 2008-01-24 | Tpo Displays Corp. | Light source device |
JP5138428B2 (ja) * | 2008-03-07 | 2013-02-06 | グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー | 表示装置 |
KR101596978B1 (ko) * | 2010-04-05 | 2016-02-23 | 가부시키가이샤 제이올레드 | 유기 el 표시 장치 및 그 제어 방법 |
WO2011125105A1 (ja) | 2010-04-05 | 2011-10-13 | パナソニック株式会社 | 有機el表示装置及びその制御方法 |
KR101818451B1 (ko) * | 2010-12-24 | 2018-01-16 | 엘지디스플레이 주식회사 | 유기발광다이오드 표시소자 및 그 제조방법 |
KR20180031846A (ko) * | 2016-09-19 | 2018-03-29 | 삼성디스플레이 주식회사 | 표시 장치 |
CN106816137B (zh) * | 2017-04-13 | 2019-09-27 | 京东方科技集团股份有限公司 | 显示装置及增加该显示装置亮度均一性的方法 |
TWI703541B (zh) * | 2018-03-08 | 2020-09-01 | 瑞鼎科技股份有限公司 | 源極驅動模組、顯示裝置以及顯示面板驅動方法 |
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US20070126728A1 (en) | 2007-06-07 |
CN1979617A (zh) | 2007-06-13 |
JP2007156443A (ja) | 2007-06-21 |
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