CN1444199A - 显示装置 - Google Patents

显示装置 Download PDF

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CN1444199A
CN1444199A CN03107139A CN03107139A CN1444199A CN 1444199 A CN1444199 A CN 1444199A CN 03107139 A CN03107139 A CN 03107139A CN 03107139 A CN03107139 A CN 03107139A CN 1444199 A CN1444199 A CN 1444199A
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display device
video signal
luminance
organic
signal
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CN1264130C (zh
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小川隆司
斋藤善范
安田仁志
西川龙司
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Sanyo Electric Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • 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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • 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]
    • G09G3/3225—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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0238—Improving the black level
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation

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  • Engineering & Computer Science (AREA)
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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本发明提供一种显示装置，在电致发光(EL)显示装置中，以适当的对比显示出黑白。其中，在具有用以驱动有机EL元件(120)的驱动电压(PVdd)的EL显示装置中，驱动电压(PVdd)的上限(VH)按照当视频信号(Dm)为黑信号电平(V0)时、使有机EL元件(120)的亮度在第1基准亮度(L1)以下而设定，而驱动电压(PVdd)的下限(VL)按照当所述视频信号(Dm)为白信号电平(V1)时、使有机EL元件(120)的亮度在第2基准亮度(L2)以上而设定。

Description

显示装置
技术领域
本发明涉及一种显示装置，特别涉及一种在每个显示像素中，具有电致发光元件与薄膜晶体管的电致发光显示装置。
背景技术
近年来，采用电致发光(Electro Luminescence；以下简称“EL”)元件的EL显示装置，作为取代CRT或LCD的显示装置而备受瞩目。特别作为驱动EL元件的开关元件已开发了一种具备薄膜晶体管(ThinFilm Transistor：以下简称“TFT”)的EL显示装置。
图3是表示具备这种EL元件与TFT的EL显示装置的一显示像素的等效电路图。实际的EL显示装置是此种显示像素以矩阵状配置多个从而构成显示区域。
图3是包括有第1TFT100、第2TFT110及有机EL元件120的EL显示装置的等效电路图，其表示在第n行栅极信号线50与第m列漏极信号线60的交叉点附近所形成的一显示像素。
供给栅极信号Gn的栅极信号线50，与供给漏极信号、即视频信号Dm的漏极信号线60相互交叉。在这二个信号线的交叉点附近，配置有机EL元件120、用以驱动该有机EL元件120的TFT100、以及用以选择显示像素的TFT110。
在有机EL元件驱动用的第1TFT100的漏极110d上，连接有驱动电源105，并从此驱动电源105供给正驱动电压PVdd。此外，源极110s连接于有机EL元件120的阴极(阳极)121。
再者，通过栅极信号线50连接于显示像素选择用的第2TFT110的栅极110g，而供给栅极信号Gn，并通过在漏极110d上连接漏极信号线60，而供给视频信号Dm。第2TFT110的源极110s连接于上述第1TFT100的栅极110g。在此，栅极信号Gn是从未图示的栅极驱动电路中输出。视频信号Dm则由未图示的漏极驱动电路中输出。
有机EL元件120是由阴极121、阳极(阴极)122、以及形成于阴极121与阳极122间的发光元件层123所构成。阳极122是连接于供给负共用电压的共用电源140上。
在第1TFT100的栅极100g上连接有保持电容130。换句话说，保持电容130的一方电极是连接于栅极100g，而另一方电极则连接于保持电容电极131上。保持电容130通过保持对应于视频信号Dm的电荷，设置成用于在1场(field)期间中保持显示像素的视频信号。
以下说明上述构造的EL显示装置的动作。栅极信号Gn是若在一水平期间中呈高电平的话，第2TFT110会导通。如此，来自漏极信号线60的视频信号Dm会通过第2TFT110，而施加于第1TFT100的栅极100g。然后，对应供应至栅极100g的视频信号Dm，第1TFT100的电导会变化，且对应于此的驱动电流将从驱动电源105通过第1TFT 100，而供给至有机EL元件120。藉此，控制有机EL元件120的亮度。
如上所述，有机EL元件120的发光亮度是通过对应于视频信号Dm使第1TFT100的电导产生变化而进行控制。但是，针对如何设定驱动电源105所供应的正驱动电压PVdd则尚未被探讨到。因此，将导致无法适当地设定正驱动电压PVdd，且无法充分确保EL显示的对比等不良现象。
发明内容
有鉴于此，本发明的目的在于：着眼于驱动电源105所供应的正驱动电压PVdd，而适当地设定有机EL元件120的亮度。
本发明的EL显示装置具备有多个显示像素，其中，各显示像素包括有：电致发光元件；在源极连接上述电致发光元件的驱动用的第1薄膜晶体管；对上述第1薄膜晶体管的漏极供应驱动电压的驱动电源；以及对漏极供应视频信号，同时对应栅极信号而将上述视频信号供应至上述第1薄膜晶体管的栅极的像素选择用的第2薄膜晶体管；其中，
上述驱动电压的上限按照当上述视频信号呈黑信号电平时、使上述电致发光元件的亮度在第1基准亮度以下而设定，同时上述驱动电压的下限按照当上述视频信号呈白信号电平时、使上述电致发光元件的亮度在第2基准亮度以上而设定。
本发明是着眼于驱动电压、视频信号的白信号电平与黑信号电平、以及电致发光元件的间的关系，而设定驱动电压的上限与下限。所以，借助于将驱动电压设定在上述范围，可适当地执行EL显示装置的白显示与黑显示。
附图说明
图1是本发明实施方式的EL显示装置中的驱动电压PVdd的设定的说明图。
图2是本发明实施方式的驱动电压PVdd与有机EL元件亮度间的关系图。
图3是具备EL元件与TFT的EL显示装置的一显示像素的等效电路图。
符号说明：50栅极信号线；60漏极信号线；105驱动电源；110第1TFT；120有机EL元件；130保持电容；140共用电源。
具体实施方式
其次，针对本发明实施方式，参照附图进行详细说明。有关本发明实施方式的EL显示装置的等效电路构造与图3所示相同。在以下说明中，将第1TFT设定为P沟道型，将第2TFT设定为N沟道型。
图1是针对本发明实施方式的EL显示装置中的驱动电压PVdd的设定进行说明的图。从漏极信号线60通过第2TFT110所供应的视频信号Dm，是在白信号电平(V1)与黑信号电平(V0)之间产生变化。黑信号电平(V0)＞白信号电平(V1)。
其中，相对于视频信号Dm的黑信号电平(V0)，若从栅极信号线50所供应的栅极信号Gn的高电平Gn(H)高至某种程度的话，视频信号Dm将直接依此电平状态供应给第1TFT100的栅极100g。此条件具体而言为Gn(H)≥V0+Vth。其中，Vth是第2TFT110的临限电压(ThresholdVoltage)。但是，此条件并非限制本发明的范围，也可为Gn(H)＜V0+Vth。但是，必须Gn(H)≥Vth。
现在，将视频信号Dm设定为黑信号电平(V0)。然后，此黑信号电平(V0)便在Gn(H)≥V0+Vth的情况下，直接施加于第1TFT100的栅极100g。在第1TFT100中流通有对应于此的较小电流，并供应给有机EL元件120。此时，有机EL元件120的亮度必须设定为可辨视黑显示的某种程度的暗。第1TFT100最好完全关断，其亮度为0cd/cm2。
但是，若驱动电压PVdd提高至某种极限以上的话，第1TFT100将导通，且电流将开始流通。如此，有机EL元件120的亮度便将提升，而导致EL显示的对比的恶化。所以，在此情况下，设定有机EL元件120的第1基准亮度L1，并将此亮度变成第1基准亮度L1时的驱动电压PVdd，设定为驱动电压PVdd的上限电压VH。
另外，当Gn(H)＜V0+Vth的时，施加于第1TFT100的栅极100g的黑信号电平电压，将降低至Gn(H)-Vth，并以该降低的电压为基准，设定驱动电压PVdd的上限电压VH。
另一方面，将视频信号Dm设定为白信号电平(V1)。然后，此白信号电平(V1)便将施加于第1TFT100的栅极100g，而第1TFT100将导通，且流通有对应于此的较大电流，并供应给有机EL元件120。此时，有机EL元件120的亮度必须设定为可辨视白显示的某种程度的亮。
但是，若驱动电压PVdd降低的话，将随第1TFT100的电流的减少，而使有机EL元件120的亮度降低，仍将造成EL显示对比的恶化。所以，在此情况下，设定有机EL元件120的第2基准亮度L2，并将该亮度变为第2基准亮度L2时的驱动电压PVdd，设定为驱动电压PVdd的下限电压VL。
所以，用以确保EL显示的白与黑对比的驱动电压PVdd的适当设定范围，将成为VL≤PVdd≤VH。
其次，根据本发明者的实验结果，针对驱动电压PVdd的具体设定范围进行说明。图2是驱动电压PVdd与有机EL元件亮度之间的关系图。将从共用电源140对有机EL元件120所供应的负共用电压CV设定为-7V。此外，白信号电平(V1)是设定为1V，黑信号电平(V0)则设定为5V。
如图所示，在黑信号时，有机EL元件将显示较低亮度，而驱动电压PVdd将缓缓地开始上升至7V以上。所以，将第1基准亮度L1、即，EL显示未发光且可辩视黑色的基准线设定为20cd/cm2。另一方面，在白信号时，有机EL元件虽显示较高亮度，但将随PVdd的减少而降低。所以，将第2基准亮度L2、即EL显示发光且可辩视白色的基准线设定为200cd/cm2
依照此种设定，适当的驱动电压PVdd将在5.0V至7.7V范围内。上述第1基准亮度L1、第2基准亮度L2的设定值虽为较佳值，但是并不仅限于此，可配合EL显示装置的规格等而采用其它适当的设定值。此外，有关白信号电平(V1)、黑信号电平(V0)也可适当地变更。
另外，在上述实施例中，虽根据室温下的驱动电压PVdd与有机EL元件亮度间的关系，设定驱动电压PVdd的范围，但是因为有机EL元件的亮度具有温度依存性，因此实际上在考虑其温度变化后，再设定驱动电压PVdd范围较为适当。
另外，在本实施方式中，虽第1TFT100属于P沟道型，而第2TFT110属于N沟道型，但是并不仅限于此，也可第1TFT100属于N沟道型，第2TFT110属于P沟道型。
当驱动用的第1TFT100属于N沟道型时，视频信号Dm的白信号与黑信号电平将相反。换句话说，白信号电平(V0)将低于黑信号电平(V1)。但是，即便此种EL显示装置，本发明同样可适用。
依照本发明，着眼于驱动电压、视频信号的白信号电平与黑信号电平、以及电致发光元件间的关系，而设定驱动电压PVdd的上限VH与下限VL。所以，借助于将驱动电压PVdd设定于根据上限VH与下限VL所限定的范围内，即可在EL显示装置中，以适当的对比进行黑白显示。

Claims (4)

1.一种显示装置，具有多数个显示像素；其中，各显示像素包括有：电致发光元件、在源极与所述电致发光元件连接的驱动用的第1薄膜晶体管、对该第1薄膜晶体管的漏极供应驱动电压的驱动电源、以及像素选择用的第2薄膜晶体管，是对漏极供应视频信号，同时对应栅极信号而将所述视频信号供应至所述第1薄膜晶体管的栅极，其特征为：
所述驱动电压的上限，按照当所述视频信号呈黑信号电平时、使所述电致发光元件的亮度在第1基准亮度以下而设定；同时所述驱动电压的下限，按照当所述视频信号呈白信号电平时、使所述电致发光元件的亮度在第2基准亮度以上而设定。
2.如权利要求1所述的显示装置，其特征为，所述第1基准亮度是在20cd/cm2以下。
3.如权利要求1所述的显示装置，其特征为，所述第2基准亮度是在200cd/cm2以上。
4.如权利要求1所述的显示装置，其特征为，所述第1薄膜晶体管是P沟道型，而所述视频信号的黑信号电平大于所述视频信号的白信号电平。
CNB031071392A 2002-03-08 2003-03-07 显示装置 Expired - Lifetime CN1264130C (zh)

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