JP5524646B2 - 表示装置 - Google Patents
表示装置 Download PDFInfo
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- JP5524646B2 JP5524646B2 JP2010023285A JP2010023285A JP5524646B2 JP 5524646 B2 JP5524646 B2 JP 5524646B2 JP 2010023285 A JP2010023285 A JP 2010023285A JP 2010023285 A JP2010023285 A JP 2010023285A JP 5524646 B2 JP5524646 B2 JP 5524646B2
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- drive
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- pixel
- Prior art date
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 4
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Images
Classifications
-
- 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
- G09G2300/088—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 using a non-linear two-terminal 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data 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
- G09G2320/02—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
- G09G2320/04—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
Landscapes
- 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 Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Description
有機EL素子は使用に伴い素子特性が劣化する。通常、劣化により素子の電流発光効率が低下し、素子駆動電圧が上昇する。電流発光効率の低下の原因は完全には解明されていないが、発光材料の変質による非発光再結合中心の生成が発光効率を低下させ、駆動電圧を上昇させる一因となっていることがわかっている(非特許文献1)。この非特許文献1によると、有機EL素子の駆動電圧の上昇と電流発光効率の低下には強い相関がある。このため、駆動電圧の上昇から、有機EL素子の発光特性の劣化を推測することができる。すなわち、発光効率の低下と駆動電圧(容量遷移電圧)の上昇はほぼ線形で、しかも、温度にほとんど依存しない。ここで、容量遷移電圧は有機層中にキャリヤが励起され有機EL素子の容量の変化が観察される電圧である。非特許文献1によると、容量遷移電圧の上昇は深い順位の非発光再結合中心の生成で説明できる。
有機EL素子からの発光強度Lは素子の駆動電流Idに比例する。電流発光効率をηとして、
L=η・Id (1)
となる。
Δη=κΔvoled (2)
と表せる。ただし、κは温度に依らない定数である。
Id=(β/2)(Vg−Vth)2 (3)
である。ただし、βは相互コンダクタンス、Vg,Vthは駆動TFTのゲート・ソース間電圧およびしきい値電圧である。
Vg=Vdat(aV0+b) (4)
となる。ここで、駆動電圧V0は、上述のように有機EL素子のターンオン電圧とすることができ、以下駆動電圧V0をターンオン電圧V0とする。
Vg=Vdat{aV0 0(1+Δν)+b} (5)
となる。ただし、V0 0は有機EL素子の劣化前の有機EL素子駆動電圧値である。
L≒(β/2)Vdat 2・ξ2(1−Δη)(1+λΔV0)
となる。
ξ=aV0 0+b
λ=(2aV0 0)/(aV0 0+b)
である。
L≒(β/2)Vdat 2・ξ2
となり、有機EL素子からの発光強度Lは、素子の発光効率の低下に依らずほぼ一定となる。
図1は、実施形態1の1画素分の回路図である。駆動トランジスタT1、書込みトランジスタT2、乗算器として機能するトランジスタT3、T3の乗算器入力を制御するトランジスタT4と、保持容量Csと、有機EL素子ELと、から構成される。
図3は、本発明の実施形態2の回路図である。実施形態2の回路はさらに一般的な応用を考えて、有機EL素子の発光効率劣化補償に加えて、駆動TFTのしきい値電圧補償機能を持たせた例である。実施形態1の回路に加え、発光制御トランジスタT5、および、リセットトランジスタT6を加えた6トランジスタ・1容量により構成される。
Claims (2)
- 複数の画素をマトリクス状に配し、各画素を駆動回路により駆動する表示装置であって、
各画素は、
流れる電流に応じて発光する発光素子と、
この発光素子の目標輝度を示すデータ信号に応じて、前記発光素子に供給する駆動電流を制御する駆動素子と
を含み、
前記駆動回路は、
前記発光素子の両端に掛かる駆動電圧に応じて、前記駆動素子に供給する前記データ信号を補正する補正手段を有し、
前記駆動素子はトランジスタであって、
前記補正手段によって、前記データ信号と前記駆動電圧に比例する電圧を前記駆動素子に印加し、
前記補正手段が、前記データ信号と前記駆動電圧を入力とする乗算回路を含み、
前記乗算回路は、ソース電極を前記データ信号の入力、ゲート電極を前記駆動電圧の入力、ドレイン電極を前記駆動素子のゲートに印加する制御電圧の出力とする、トランジスタ素子1個で構成され、
前記補正手段により、前記データ信号に対応して前記発光素子に供給される駆動電流が、前記発光素子の電圧降下量の増加に伴い増加するように補正されることを特徴とする表示装置。 - 請求項1に記載の表示装置において、
画素内に配した前記補正手段に加え、
画素内に、
前記駆動素子のゲートに印加する制御電圧を前記発光素子の駆動電圧の変動分をオフセットする手段を有すること
を特徴とする表示装置。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010023285A JP5524646B2 (ja) | 2010-02-04 | 2010-02-04 | 表示装置 |
EP11702378.8A EP2531993B1 (en) | 2010-02-04 | 2011-02-02 | Display device |
CN201180008146.5A CN102741909B (zh) | 2010-02-04 | 2011-02-02 | 显示装置 |
PCT/US2011/023445 WO2011097277A1 (en) | 2010-02-04 | 2011-02-02 | Display device |
KR1020127021065A KR101720707B1 (ko) | 2010-02-04 | 2011-02-02 | 디스플레이 디바이스 |
US13/020,488 US8638277B2 (en) | 2010-02-04 | 2011-02-03 | Display device |
TW100104129A TWI501212B (zh) | 2010-02-04 | 2011-02-08 | 顯示裝置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010023285A JP5524646B2 (ja) | 2010-02-04 | 2010-02-04 | 表示装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2011164134A JP2011164134A (ja) | 2011-08-25 |
JP5524646B2 true JP5524646B2 (ja) | 2014-06-18 |
Family
ID=43608047
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2010023285A Active JP5524646B2 (ja) | 2010-02-04 | 2010-02-04 | 表示装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US8638277B2 (ja) |
EP (1) | EP2531993B1 (ja) |
JP (1) | JP5524646B2 (ja) |
KR (1) | KR101720707B1 (ja) |
CN (1) | CN102741909B (ja) |
TW (1) | TWI501212B (ja) |
WO (1) | WO2011097277A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103063741B (zh) * | 2012-12-28 | 2015-05-27 | 瓦房店轴承集团有限责任公司 | 轴承外圈超声波探伤机 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW201426709A (zh) | 2012-12-26 | 2014-07-01 | Sony Corp | 顯示裝置、顯示裝置之驅動方法及電子機器 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9923261D0 (en) * | 1999-10-02 | 1999-12-08 | Koninkl Philips Electronics Nv | Active matrix electroluminescent display device |
JP3800050B2 (ja) * | 2001-08-09 | 2006-07-19 | 日本電気株式会社 | 表示装置の駆動回路 |
JP4115763B2 (ja) * | 2002-07-10 | 2008-07-09 | パイオニア株式会社 | 表示装置及び表示方法 |
JP2005217214A (ja) * | 2004-01-30 | 2005-08-11 | Hitachi Ltd | 半導体薄膜の製造方法及び画像表示装置 |
US7502000B2 (en) * | 2004-02-12 | 2009-03-10 | Canon Kabushiki Kaisha | Drive circuit and image forming apparatus using the same |
JP4095614B2 (ja) * | 2004-02-12 | 2008-06-04 | キヤノン株式会社 | 駆動回路及びそれを用いた画像形成装置 |
JP2006091709A (ja) * | 2004-09-27 | 2006-04-06 | Sony Corp | 画像表示装置及びその駆動方法 |
TWI282537B (en) * | 2005-04-21 | 2007-06-11 | Au Optronics Corp | Display units |
US7872619B2 (en) * | 2006-11-01 | 2011-01-18 | Global Oled Technology Llc | Electro-luminescent display with power line voltage compensation |
US7355574B1 (en) * | 2007-01-24 | 2008-04-08 | Eastman Kodak Company | OLED display with aging and efficiency compensation |
JP4281018B2 (ja) * | 2007-02-19 | 2009-06-17 | ソニー株式会社 | ディスプレイ装置 |
JP2009031451A (ja) * | 2007-07-25 | 2009-02-12 | Eastman Kodak Co | 表示装置 |
US8358256B2 (en) * | 2008-11-17 | 2013-01-22 | Global Oled Technology Llc | Compensated drive signal for electroluminescent display |
-
2010
- 2010-02-04 JP JP2010023285A patent/JP5524646B2/ja active Active
-
2011
- 2011-02-02 WO PCT/US2011/023445 patent/WO2011097277A1/en active Application Filing
- 2011-02-02 KR KR1020127021065A patent/KR101720707B1/ko active IP Right Grant
- 2011-02-02 EP EP11702378.8A patent/EP2531993B1/en active Active
- 2011-02-02 CN CN201180008146.5A patent/CN102741909B/zh active Active
- 2011-02-03 US US13/020,488 patent/US8638277B2/en active Active
- 2011-02-08 TW TW100104129A patent/TWI501212B/zh active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103063741B (zh) * | 2012-12-28 | 2015-05-27 | 瓦房店轴承集团有限责任公司 | 轴承外圈超声波探伤机 |
Also Published As
Publication number | Publication date |
---|---|
WO2011097277A1 (en) | 2011-08-11 |
CN102741909A (zh) | 2012-10-17 |
EP2531993B1 (en) | 2016-06-22 |
TWI501212B (zh) | 2015-09-21 |
TW201133448A (en) | 2011-10-01 |
CN102741909B (zh) | 2015-02-04 |
JP2011164134A (ja) | 2011-08-25 |
EP2531993A1 (en) | 2012-12-12 |
US8638277B2 (en) | 2014-01-28 |
US20110187761A1 (en) | 2011-08-04 |
KR20120123414A (ko) | 2012-11-08 |
KR101720707B1 (ko) | 2017-03-28 |
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