CN100504993C - 显示装置 - Google Patents
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Abstract
本发明的目的在于提供一种可防止在显示装置关闭时EL元件瞬间发出很强的光而导致发光层的劣化的显示装置。本发明的显示装置在各象素中具备有机EL元件(60)和控制该元件(60)的TFT(30、40),该显示装置设置有顺序电路(350),在装置关闭时,在停止向有机EL元件(60)供给电源电压Pvdd后,停止向驱动器(80、90)供给电源电压Vvdd、Hvdd,上述驱动器(80、90)用于驱动控制各有机EL元件(60)的TFT(30、40)。
Description
技术领域
本发明涉及一种具备薄膜晶体管(以下称作TFT)的显示装置,该薄膜晶体管控制向发光元件供给的电流。
背景技术
近年来,使用场致发光(以下称作“EL”)元件的EL显示装置作为代替CRT或LCD的显示装置而引起人们的关注。
此外,还正在研究开发具备薄膜晶体管(以下称作TFT)来作为驱动该EL元件的开关(switching)元件的EL显示装置。
图2示出一般的EL显示装置的等效电路图。
如图2所示,EL显示板在绝缘性基板10上配置了:多根扫描信号线81,连接在提供扫描信号的垂直侧驱动器80上;以及多根漏极信号线91,根据从供给数据信号的水平侧驱动器90输出的取样脉冲的定时,使取样晶体管SP1、...SPk、SPk+1...SPn导通,提供数据信号线92的数据信号Sig。此外,在这两种信号线81、91的交叉部附近配置;开关用TFT30,连接在这两种信号线81、91上;元件驱动用TFT40,连接在该开关用TFT30上;以及有机EL元件60,根据施加到该元件驱动用TFT40上的电压,从元件驱动电源线100被供给电流后进行发光。
此外,一电极71连接在TFT30的源极11s上,另一电极72具备在各显示象素200中施加公共电位的保持电容70。
此外,水平侧起始脉冲STH等的定时信号等提供给水平侧驱动器90,另外垂直侧起始脉冲等的定时信号等提供给垂直侧驱动器80。
进而,向各驱动器80、90供给用于驱动各驱动器的驱动电压Hvdd、Vvdd。由该驱动电压Hvdd、Vvdd驱动构成各驱动器的移位寄存器。
这里,对应于以起始信号为基础的取样脉冲,使取样晶体管SP导通,数据信号线92的数据信号Vdatal被供给到漏极信号线91。此外,栅极信号从栅极信号线81被输入到第1TFT30的栅极13,使第1TFT30导通。由此,漏极信号流向TFT30的源极11s,此时的电压Vdata2被施加到第2TFT40的栅极43上,使第2TFT40的栅极导通,对应于该电压Vdata2,元件驱动电源线100的电流流向EL元件60,使EL元件60发光。
图3示出有机EL显示装置的显示象素附近的平面图,该显示装置具备作为开关用及元件驱动用的TFT,图4(a)示出沿图3中的A—A线的剖面图,图4(b)示出沿图3中的B—B线的剖面图。
如图3所示,在由栅极信号线81和漏极信号线91围起的区域内形成显示象素。在两信号线的交叉部附近具备开关用的第1TFT30,该TFT30的源极11s兼作在其与后述的保持电容电极线54之间构成电容的电容电极55,并且连接在EL元件驱动用的第2TFT40的栅极43上。第2TFT的源极41s连接在有机EL元件60的阳极61R上,另一漏极41d连接在驱动电源线100上,该电源线100是向有机EL元件60供电的电流源。
此外,在TFT的附近,与栅极信号线81并行地配置了保持电容电极线54。该保持电容电极线54由铬等形成,隔着栅极绝缘膜12在其与和TFT30的源极11s连接的电容电极55之间积蓄电荷从而构成电容。该保持电容是为了保持第2TFT40的栅极电极43上施加的电压而设置的。
如图4所示,有机EL显示装置是将TFT及有机EL元件按顺序层叠在由玻璃或合成树脂等形成的基板或具有导电性的基板或半导体基板等基板10上而成的。
首先,说明作为开关用的TFT的第1TFT30。
如图4(a)所示,在由石英玻璃、无碱玻璃等构成的绝缘性基板10上,对用CVD法等成膜的非晶硅膜(a-Si膜)照射激光,使其多结晶化,成为作为有源层的多晶硅膜(p—Si膜)11。在该p—Si膜11上层叠栅极绝缘膜12。而且,在其上形成扫描信号线81以及由Al构成的漏极信号线91,该信号线81由铬(Cr)、钼(Mo)等的高融点金属构成,兼作栅极电极13,该信号线91兼作漏极电极15。
而且,在栅极绝缘膜12、栅极电极13、元件驱动电源线100及保持电容电极线54上的整个面上形成按SiO2膜、SiN膜及SiO2膜的顺序层叠的层间绝缘膜14,在对应于漏极11d而设计的接触孔中设置充填Al等金属的漏极电极15,进而,在整个面上形成由有机树脂构成的、使表面平坦的平坦化绝缘膜16。
接着,说明作为有机EL元件的驱动用TFT的第2TFT40。
如图4(b)所示,在由石英玻璃、无碱玻璃等构成的绝缘性基板10上按顺序形成与第1TFT30的有源层同时形成的由p-Si膜构成的有源层41、栅极绝缘膜12及由铬(Cr)、钼(Mo)等高融点金属构成的栅极电极43,在该有源层41上设沟道41c、以及位于该沟道41c两侧的源极41s和漏极41d。而且,在有源层41及栅极绝缘膜12上的整个面上形成按SiO2膜、SiN膜及SiO2膜的顺序层叠的层间绝缘膜14,在对应于漏极41d而设计的接触孔内设充填Al等金属,配置连接到驱动电源Pvdd上的元件驱动电源线100。进而,在整个表面上具有由例如有机树脂构成的、使表面平坦的平坦化绝缘膜16。而且,在该平坦化绝缘膜16的与源极41s对应的位置上形成接触孔,并经该接触孔,把与源极41s接触的由ITO(Indium Tin Oxide:氧化铟锡)构成的透明电极、即有机EL元件的阳极61设在平坦化绝缘膜16上。
有机EL元件60的构造是:由ITO等透明电极构成的阳极61、发光元件层66和由镁铟合金等构成的阴极67按顺序层叠而成,其中的发光元件层66由第1空穴输送层62、第2空穴输送层63、发光层64及由Bebq2等构成的电子输送层65构成,而第1空穴输送层62由MTDATA(4,4,4—三偶(3—甲基苯基苯胺)三苯胺)等构成,第2空穴输送层63由TPD(N,N—二苯—N,N—双(3—甲苯)—1,1联苯—4,4—二胺)等构成,发光层64由包含喹吖啶酮(Quinacridone)衍生物的Bebq2(二(10—羟基苯并[h]喹啉并)铍)等构成。另外,为了防止阳极61的边缘和阴极67的短路,形成绝缘膜68。由该有机EL元件60形成显示象素。
另外,有机EL元件中,从阳极注入的空穴和从阴极注入的电子在发光层内部再结合,激励形成发光层的有机分子,产生激发子。在该激发子放射失活的过程中从发光层放出光,该光从透明的阳极经透明绝缘基板向外部射出进行发光。
在此,对用于产生驱动电压Hvdd、Vvdd和元件驱动电源Pvdd的电源电路300进行说明,其中,该驱动电压Hvdd、Vvdd用于驱动图2所示的各驱动器80、90。
图5示出现有电源电路的方框图。
如该图所示,电源电路300包括:产生用于驱动各驱动器80、90的驱动电压Hvdd、Vvdd的驱动器驱动电压发生电路322、以及产生元件驱动电压Pvdd的元件驱动电压发生电路332。各驱动电压发生电路322、332由DC/DC转换器构成,把电源310的电压、例如15V的电压转换成12V。
该各驱动电压发生电路322、332的电压分别供给两驱动器80、90及元件驱动电源线100。
然而,在现有EL显示装置中,在为了停止使用该显示装置而关闭显示装置时,当比元件驱动电压Pvdd先施加到第2TFT40的栅极上的电压Vdata2下降时,就在EL元件60中瞬间流过很大的电流,存在会导致有机EL元件60的发光层66的劣化的缺点。
发明内容
因此,本发明是鉴于上述现有缺点而做出的,其目的在于提供一种显示装置,能够防止在显示装置关闭时EL元件瞬间发强光而导致发光层的劣化。
本发明的显示装置具备:向多个栅极信号线供给扫描信号的垂直驱动器、向与上述多个栅极信号线交叉的多个漏极信号线供给数据信号的水平驱动器、在该两信号线的交叉部附近连接在该两信号线上的薄膜晶体管、连接在该薄膜晶体管上的发光元件、以及向该发光元件提供电流的元件驱动电源,其中,该显示装置具有:顺序(sequence)电路,在停止向上述两驱动器供给驱动该两驱动器的电压前,停止向上述元件驱动电源供给电压。
此外,上述显示装置是这样的一种显示装置,即,上述薄膜晶体管由第1及第2薄膜晶体管构成,该第1薄膜晶体管的漏极连接在上述漏极信号线上,栅极连接在上述扫描信号线上,源极连接在上述第2薄膜晶体管的栅极上,上述第2薄膜晶体管的漏极连接在上述元件驱动电源上,源极连接上述发光元件的一个电极上。
进而,上述显示装置是这样的一种显示装置,上述顺序电路在向上述两驱动器供给驱动该两驱动器的电压后,向上述元件驱动电源提供电压。
进一步地,上述显示装置是这样的一种显示装置,上述顺序电路由第1及第2晶体管、第1及第2电阻、以及连接上述第1晶体管和上述第2晶体管的第3电阻构成,上述第1晶体管的发射极连接在与元件驱动电源发生电路连接的上述第1电阻上,基极连接在电源上,集电极接地,上述第2晶体管的发射极连接在上述第2电阻上,该第2电阻连接在驱动上述两驱动器的驱动电源发生电路上,基极连接在与上述第1晶体管的发射极连接第3电阻上以及将一端接地的电容的另一端上,集电极接地。
此外,上述显示装置中,上述发光元件是场致发光元件。
附图说明
图1是本发明的显示装置的驱动电路图。
图2是一般的EL显示装置的电路图。
图3是一般的EL显示装置的显示象素附近的平面图。
图4是沿图3的A—A线及B—B线的EL显示装置的剖面图。
图5是现有显示装置的驱动电路图。
具体实施方式
下面,说明本发明的显示装置。
图1示出本发明的显示装置的电源电路的电路图。
如图1所示,电源电路300包括:驱动器驱动电压发生电路322、元件驱动电压发生电路332和顺序电路350,上述驱动器驱动电压发生电路322与电源310连接,产生用于驱动垂直驱动器80及水平驱动器90的电压,上述元件驱动电压发生电路332同样与电源310连接,并且驱动发光元件。
顺序电路350包括:第1晶体管Q1和第2晶体管Q2、以及电阻R1、R2、R3和电容C1。第1晶体管Q1和第2晶体管Q2都是p沟道晶体管。
第1晶体管Q1的发射极连接到与元件驱动电源发生电路332连接的第1电阻R1上,基极连接到电源310上,集电极接地。
此外,第2晶体管Q2的发射极连接到与驱动水平和垂直驱动器的驱动器驱动电压发生电路322连接的第2电阻R2上,基极经第3电阻R3连接到第1晶体管Q1的发射极上,另外还连接在其与接地点之间设置的电容C1上,集电极接地。
当接通显示装置并从电源向显示装置提供电压时,从图1的电源电路300向两驱动器80、90提供电压Hvdd、Vvdd,两驱动器80、90处于驱动状态,并且处于向元件驱动电源线100施加驱动元件用的电压Pvdd的状态。例如,电源310的电压是20V,此时的驱动器驱动电压Hvdd、Vvdd是15V,元件驱动电压Pvdd是12V。
向成为驱动状态的两驱动器80、90输入为进行起始脉冲STH、STV等的显示所需要的各信号。
而且,对应于以起始脉冲STH为基础的取样脉冲,使取样晶体管SP1、...SPk、SPk+1、...SPn按顺序导通,将数据信号线92的数据信号Vdatal提供给各漏极信号线91。另外,根据起始脉冲STV,栅极信号从栅极信号线81输入到第1TFT30的栅极13,使第1TFT30导通。由此,漏极信号流向TFT30的源极11s,此时的电压Vdata2被施加到第2TFT40的栅极43上,第2TFT40的栅极导通,对应于该电压Vdata2,元件驱动电源线100的电流流向EL元件60,EL元件60发光。
这里,针对图1中显示装置接通时的情况进行说明。
当接通电源310时,电源310的电压供给到元件驱动电压发生电路332、驱动器驱动电压发生电路322以及第1晶体管Q1的基极。
当电压供给到元件驱动电压发生电路332时,产生元件驱动电压Pvdd,并供给元件驱动电源线100。
此外,当向驱动器驱动电压发生电路322供给电压时,产生驱动器驱动电压Hvdd、Vvdd,并供给两驱动器80、90。
进而,由于第1晶体管Q1是PNP晶体管,因此,即使电源310接通,Q1也不导通。
因而,当电源接通时,从元件驱动电压发生电路322向元件驱动电源线100供给元件驱动电压Pvdd,并且驱动器驱动电压发生电路322产生驱动器驱动电压Hvdd、Vvdd并供给两驱动器80、90。
下面,说明图1中显示装置关闭的情况。
当断开电源310时,元件驱动电压发生电路332、驱动器驱动电压发生电路322及顺序电路350断开。
当电源310断开时,因为第1晶体管Q1的基极处于低电压,所以第1晶体管Q1导通。于是,与施加到元件驱动电源线100上的元件驱动电压Pvdd对应的电流经电阻R1及第1晶体管Q1的发射极—集电极间并流出到接地点。此时,通过由电阻R1和电容C2决定的时间常数,控制因Q1而使电压下降的定时。
此外,因为通过断开电源310,从而使第1晶体管Q1导通,由此使该Q1的发射极电位下降,在经由连接在该发射极上的电阻R3而连接的第2晶体管Q2的基极上施加了低电位,所以就使第2晶体管Q2导通。由此,施加到两驱动器80、90上的电荷从电阻R2及第2晶体管Q2的发射极流向集电极,进而流到接地点。此时,通过由电阻R2及电容C3决定的时间常数,控制因Q2而使电压下降的定时。
这样,在断开电源310时,首先,使第1晶体管Q1导通,之后,使第2晶体管Q2成为导通状态。即,首先通过使第1晶体管Q1导通而施加到元件驱动电源线100上的电荷,经第1晶体管Q1流到接地点,在第1晶体管Q1导通后,通过使第2晶体管Q2导通而施加到两驱动器80、90上的电荷,经第2晶体管Q2流到接地点。
这样,首先,元件驱动电压Pvdd的供给停止,之后,停止提供驱动器驱动电压Hvdd、Vvdd。因而,在停止向第2TFT40的栅极43施加电压前,能够停止向元件驱动电源线100供给电压。
因为通过按这样的顺序来关闭显示装置,能够防止关闭时向有机EL元件60、特别是向发光元件层66流过太大的电流,所以能够防止发光元件层66乃至有机EL元件60的劣化。
根据本发明的显示装置,能够得到可防止在关闭显示装置时在发光元件中瞬间流过过大的电流而导致发光元件的劣化。
Claims (4)
1.一种显示装置,具备:
向多个栅极信号线供给扫描信号的垂直驱动器;
向与上述多个栅极信号线交错的多个漏极信号线供给数据信号的水平驱动器;
在该两信号线的交错部位附近与该两信号线连接的开关元件;
与该开关元件连接的发光元件;以及
向该发光元件提供电流的元件驱动电源,其特征在于:
该显示装置具有与向上述垂直及水平驱动器供给驱动电压的驱动电压线相比,将上述元件驱动电源线提前放电的顺序电路,同时上述开关元件由第1及第2开关元件构成,
上述第1开关元件的有源层的第1区域与上述数据信号线连接,栅极与上述扫描信号线连接,有源层的第2区域与上述第2开关元件的栅极连接,
上述第2开关元件的有源层的第1区域与上述元件驱动电源线连接,有源层的第2区域与上述发光元件的一个电极连接。
2.根据权利要求1所述的显示装置,其特征在于:
上述顺序电路向该两驱动器供给驱动上述两驱动器的电压后,向上述元件驱动电源线供给电压。
3.根据权利要求1或2所述的显示装置,其特征在于:
上述顺序电路具有第1及第2晶体管,第1及第2电阻,以及连接上述第1晶体管和上述第2晶体管的第3电阻,
上述第1晶体管的发射极连接上述第1电阻,该第1电阻与元件驱动电源发生电路连接,基极连接电源,集电极接地,
上述第2晶体管的发射极连接上述第2电阻,该第2电阻与驱动上述两驱动器的驱动电源发生电路连接,基极连接第3电阻及电容的一端上,该第3电阻与上述第1晶体管的发射极连接,该电容的另一端接地,集电极接地。
4.根据权利要求1~3中任何一个所述的显示装置,其特征在于:
上述发光元件是场致发光元件。
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JP4785271B2 (ja) | 2001-04-27 | 2011-10-05 | 株式会社半導体エネルギー研究所 | 液晶表示装置、電子機器 |
JP4439761B2 (ja) * | 2001-05-11 | 2010-03-24 | 株式会社半導体エネルギー研究所 | 液晶表示装置、電子機器 |
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US7218349B2 (en) * | 2001-08-09 | 2007-05-15 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
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JP4397555B2 (ja) * | 2001-11-30 | 2010-01-13 | 株式会社半導体エネルギー研究所 | 半導体装置、電子機器 |
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JP4339103B2 (ja) | 2002-12-25 | 2009-10-07 | 株式会社半導体エネルギー研究所 | 半導体装置及び表示装置 |
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EP1139326A2 (en) | 2001-10-04 |
EP1139326A3 (en) | 2003-03-05 |
CN1320899A (zh) | 2001-11-07 |
CN101546516A (zh) | 2009-09-30 |
US6653996B2 (en) | 2003-11-25 |
DE60109338D1 (de) | 2005-04-21 |
US20020011973A1 (en) | 2002-01-31 |
TW577241B (en) | 2004-02-21 |
DE60109338T2 (de) | 2005-08-11 |
KR20010106170A (ko) | 2001-11-29 |
KR100420907B1 (ko) | 2004-03-02 |
EP1139326B1 (en) | 2005-03-16 |
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