JP2011118079A - 画素回路および表示装置 - Google Patents
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 7
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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]
- 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
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
-
- 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
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
-
- 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
- G09G2330/021—Power management, e.g. power saving
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
【解決手段】駆動トランジスタT1は、電源VDDから有機EL素子OLEDに駆動電流を供給する。駆動トランジスタT1のソース端が前記有機EL素子OLEDの一端に接続され、有機EL素子OLEDの他端は電源電位Vssに接続され、かつ、前記駆動トランジスタの前記有機EL素子の表示単位面積当たりの相互コンダクタンスが1×10−11(A/V2/m2)以上である。
【選択図】図3
Description
実施形態に係る表示装置によれば、有機EL素子は駆動TFTのソースに接続される。通常、有機EL素子は駆動トランジスタ(TFT)にドレイン接続され、駆動トランジスタの表示面積当たりの相互コンダクタンスは1×10−12〜5×10−12(A/V2/m2)程度に設計される。本実施形態では、駆動トランジスタの表示面積当たりの相互コンダクタンスを1×10−11(A/V2/m2)以上、好ましくは1×10−10(A/V2/m2)以上とする。ここでトランジスタの相互コンダクタンスは、ドレイン電流をゲート電圧で偏微分した値として定義され、通常チャネル電界依存性を持つ。したがって相互コンダクタンスの値はトランジスタに印加するゲート電圧に依存する。そこで慣習的に、適当なゲート電圧範囲内でのドレイン電流のゲート電圧偏微分の最大値が相互コンダクタンス値として採用されている。
図3は、本発明の実施形態1の画素回路構成図である。2TFTと保持容量で構成されている。
有機EL素子OLEDが駆動に伴い高抵抗化する場合、有機EL素子OLEDの駆動電圧Voledを劣化後のターンオン電圧の上昇分オフセットすることが有効である。実施形態2として、駆動TFTのゲートに有機EL素子のターンオン電圧を加算する機能を有する回路を挙げる。
Vdata=VDD−(Vgs−ΔVoled)
とする。ただし、有機EL素子の目的駆動電圧をVoledとすると、
ΔVoled=Voled−Vturn−on
である。
Claims (6)
- 有機EL素子と、
電源からの電流を前記有機EL素子に供給する駆動トランジスタと、
を含み、
前記駆動トランジスタのソース端が前記有機EL素子の一端に接続され、前記有機EL素子の他端は電源電位に接続され、
かつ、前記駆動トランジスタの画素単位面積当たりの相互コンダクタンスが1×10−11(A/V2/m2)以上であることを特徴とする画素回路。 - 請求項1に記載の画素回路において、
駆動トランジスタの移動度が15cm2/Vs以上、
または、駆動トランジスタのゲート絶縁膜の厚さが1000オングストローム以下としてチャネル容量を大きくする、
または、駆動トランジスタのチャネル層またはソース電極の可視光に対する波長透過率が最大70%以上として前記有機EL素子からの光を駆動トランジスタに透過させると共に駆動トランジスタを大型化する、
のうち少なくとも一つを満たすことで前記駆動トランジスタの相互インダクタンスを大きくすることを特徴とする画素回路。 - 請求項2に記載の画素回路において、
駆動トランジスタは薄膜トランジスタ(TFT)であり、
駆動TFTのチャネル層が、多結晶シリコン、または、アモルファスシリコン、または、微結晶シリコン、または、酸化物半導体で形成されることを特徴とする画素回路。 - 請求項1〜3のいずれか1つに記載の画素回路において、
駆動TFTの閾値電圧、もしくは、有機EL素子のターンオン電圧、もしくは、それらの和、を階調信号電圧に加算して駆動TFTのゲートに印加することを特徴とする画素回路。 - 請求項1〜4に記載の画素回路において、
周囲温度、ディスプレイ本体の温度、表示画像、または表示画像の履歴によって、有機EL素子の温度を推定し、画素に供給される電源電圧または信号電圧を調整する機能を有することを特徴とする画素回路。 - 請求項1〜5のいずれか1つに記載の画素回路を用いたことを特徴とする表示装置。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009274198A JP5491835B2 (ja) | 2009-12-02 | 2009-12-02 | 画素回路および表示装置 |
CN2010800544477A CN102640091A (zh) | 2009-12-02 | 2010-11-30 | 像素电路和显示装置 |
TW099141565A TWI520119B (zh) | 2009-12-02 | 2010-11-30 | 像素電路及顯示裝置 |
US13/513,157 US20130021228A1 (en) | 2009-12-02 | 2010-11-30 | Pixel circuit and display device |
PCT/US2010/058268 WO2011068773A1 (en) | 2009-12-02 | 2010-11-30 | Pixel circuit and display device |
KR1020127014149A KR20120114245A (ko) | 2009-12-02 | 2010-11-30 | 픽셀회로 및 디스플레이 디바이스 |
EP10834986.1A EP2507688A4 (en) | 2009-12-02 | 2010-11-30 | PIXEL CIRCUIT AND DISPLAY DEVICE |
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---|---|---|---|
JP2009274198A JP5491835B2 (ja) | 2009-12-02 | 2009-12-02 | 画素回路および表示装置 |
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JP2011118079A true JP2011118079A (ja) | 2011-06-16 |
JP5491835B2 JP5491835B2 (ja) | 2014-05-14 |
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JP2009274198A Active JP5491835B2 (ja) | 2009-12-02 | 2009-12-02 | 画素回路および表示装置 |
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---|---|
US (1) | US20130021228A1 (ja) |
EP (1) | EP2507688A4 (ja) |
JP (1) | JP5491835B2 (ja) |
KR (1) | KR20120114245A (ja) |
CN (1) | CN102640091A (ja) |
TW (1) | TWI520119B (ja) |
WO (1) | WO2011068773A1 (ja) |
Cited By (4)
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WO2013015091A1 (en) * | 2011-07-22 | 2013-01-31 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device |
WO2014021150A1 (ja) * | 2012-07-31 | 2014-02-06 | シャープ株式会社 | 表示装置およびその駆動方法 |
JP2018205707A (ja) * | 2017-05-31 | 2018-12-27 | エルジー ディスプレイ カンパニー リミテッド | 電界発光表示装置 |
JP2020504340A (ja) * | 2017-03-10 | 2020-02-06 | クンシャン ゴー−ビシオノクス オプト−エレクトロニクス カンパニー リミテッドKunshan Go−Visionox Opto−Electronics Co., Ltd. | ディスプレイデバイスを駆動する方法 |
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JP5116359B2 (ja) * | 2007-05-17 | 2013-01-09 | 株式会社半導体エネルギー研究所 | 液晶表示装置 |
JP5542296B2 (ja) * | 2007-05-17 | 2014-07-09 | 株式会社半導体エネルギー研究所 | 液晶表示装置、表示モジュール及び電子機器 |
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2009
- 2009-12-02 JP JP2009274198A patent/JP5491835B2/ja active Active
-
2010
- 2010-11-30 CN CN2010800544477A patent/CN102640091A/zh active Pending
- 2010-11-30 US US13/513,157 patent/US20130021228A1/en not_active Abandoned
- 2010-11-30 EP EP10834986.1A patent/EP2507688A4/en not_active Withdrawn
- 2010-11-30 WO PCT/US2010/058268 patent/WO2011068773A1/en active Application Filing
- 2010-11-30 KR KR1020127014149A patent/KR20120114245A/ko not_active Application Discontinuation
- 2010-11-30 TW TW099141565A patent/TWI520119B/zh active
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Cited By (12)
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WO2013015091A1 (en) * | 2011-07-22 | 2013-01-31 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device |
JP2013210645A (ja) * | 2011-07-22 | 2013-10-10 | Semiconductor Energy Lab Co Ltd | 発光装置、表示モジュール及び電子機器 |
JP2013257570A (ja) * | 2011-07-22 | 2013-12-26 | Semiconductor Energy Lab Co Ltd | 発光装置、表示モジュール及び電子機器 |
US10008149B2 (en) | 2011-07-22 | 2018-06-26 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device including pixels suppressing variation in luminance |
US10629122B2 (en) | 2011-07-22 | 2020-04-21 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device |
US11081050B2 (en) | 2011-07-22 | 2021-08-03 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device |
US11741895B2 (en) | 2011-07-22 | 2023-08-29 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device |
WO2014021150A1 (ja) * | 2012-07-31 | 2014-02-06 | シャープ株式会社 | 表示装置およびその駆動方法 |
US9443471B2 (en) | 2012-07-31 | 2016-09-13 | Sharp Kabushiki Kaisha | Display device and driving method thereof |
JP2020504340A (ja) * | 2017-03-10 | 2020-02-06 | クンシャン ゴー−ビシオノクス オプト−エレクトロニクス カンパニー リミテッドKunshan Go−Visionox Opto−Electronics Co., Ltd. | ディスプレイデバイスを駆動する方法 |
US10872567B2 (en) | 2017-03-10 | 2020-12-22 | Kunshan Go-Visionox Opto-Electronics Co., Ltd. | Method for driving display device |
JP2018205707A (ja) * | 2017-05-31 | 2018-12-27 | エルジー ディスプレイ カンパニー リミテッド | 電界発光表示装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2507688A1 (en) | 2012-10-10 |
JP5491835B2 (ja) | 2014-05-14 |
KR20120114245A (ko) | 2012-10-16 |
TW201128611A (en) | 2011-08-16 |
WO2011068773A1 (en) | 2011-06-09 |
US20130021228A1 (en) | 2013-01-24 |
CN102640091A (zh) | 2012-08-15 |
TWI520119B (zh) | 2016-02-01 |
EP2507688A4 (en) | 2013-04-24 |
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