JP2004102294A - 表示装置の駆動回路及び駆動方法 - Google Patents
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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
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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
- 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
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- 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
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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
- 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
- G09G2310/0254—Control of polarity reversal in general, other than for liquid crystal displays
- G09G2310/0256—Control of polarity reversal in general, other than for liquid crystal displays with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2011—Display of intermediate tones by amplitude modulation
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- 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)
Abstract
【解決手段】各々の画素における発光装置を駆動するのに使用される駆動回路において、前記発光装置に結合され、前記発光装置に選択的に駆動電流を供給する発光装置駆動ユニットと、前記発光装置駆動ユニットに結合され、前記発光装置駆動ユニットが前記発光装置に駆動電流を供給するとすぐに、制御信号の電圧レベルにしたがって前記発光装置を放電する放電ユニットとを具える。
【選択図】図3
Description
Ids=(1/2)×k2×(VGS−Vth2)2
=(1/2)×k2×(Vg2−Vd2−Vth2)2
ここで、k2=μn×Cox×(W/L)2、μnは電子移動度であり、Coxは単位面積あたりのゲートキャパシタンスであり(μn及びCoxは一定値を有する)、(W/L)2は第2薄膜トランジスタ(TFT2)に関するチャネル幅/長であり、Vg2は第2薄膜トランジスタ(TFT2)のゲート電圧であり、Vd2は第2トランジスタ(TFT2)のドレイン電圧であり、Vth2は第2薄膜トランジスタ(TFT2)のしきい値電圧である。
Ids=(1/2)×k2×(VGS−Vth2)2
=(1/2)×k2×(Vg2−Vd2−Vth2)2
ここで、k2=μn×Cox×(W/L)2、μnは電子移動度であり、Coxは単位面積あたりのゲートキャパシタンスであり(μn及びCoxは一定値を有する)、(W/L)2は第2薄膜トランジスタ(TFT2)に関するチャネル幅/長であり、Vg2は第2薄膜トランジスタ(TFT2)のゲート電圧であり、Vd2は第2トランジスタ(TFT2)のドレイン電圧であり、Vth2は第2薄膜トランジスタ(TFT2)のしきい値電圧である。
110、310 駆動回路
120、320 発光装置
311 発光装置選択ユニット
313 発光装置駆動ユニット
315 放電ユニット
Claims (20)
- 複数の画素を有する表示装置の駆動回路であって、各々の画素における発光装置を駆動するのに使用される駆動回路において、
前記発光装置に結合され、前記発光装置に選択的に駆動電流を供給する発光装置駆動ユニットと、
前記発光装置駆動ユニットに結合され、前記発光装置駆動ユニットが前記発光装置に駆動電流を供給するとすぐに、制御信号の電圧レベルにしたがって前記発光装置を放電する放電ユニットとを具えることを特徴とする駆動回路。 - 請求項1に記載の駆動回路において、前記発光装置駆動ユニットに結合され、スキャン信号及びデータ信号を受け、前記スキャン信号及びデータ信号が論理レベル‘1’にある場合、前記発光装置駆動ユニットが前記発光装置に駆動電流を供給できるようにする発光装置選択ユニットをさらに具えることを特徴とする駆動回路。
- 請求項2に記載の駆動回路において、前記制御信号が次の画素からのスキャン信号を使用することを特徴とする駆動回路。
- 請求項3に記載の駆動回路において、前記放電ユニットが、前記次の画素におけるスキャン信号が論理レベル‘1’すなわち高電圧レベルにある場合、前記発光装置を放電することを特徴とする駆動回路。
- 請求項1に記載の駆動回路において、前記放電ユニットを接地電位に結合し、電荷が前記発光装置からグランドに放電されるようにしたことを特徴とする駆動回路。
- 請求項1に記載の駆動回路において、前記放電ユニットを負電圧に結合し、電荷が前記発光装置から負電圧端子に放電されるようにしたことを特徴とする駆動回路。
- 請求項1に記載の駆動回路において、前記放電ユニットをトランジスタとし、前記トランジスタを、前記制御信号の電圧レベルにしたがってスイッチオンし、前記発光装置を放電することを特徴とする駆動回路。
- 請求項7に記載の駆動回路において、前記トランジスタのゲート端子を制御信号端子に接続し、前記トランジスタのドレイン端子を接地電位に接続し、前記トランジスタが前記制御信号によってターンオンした場合、前記発光装置における電荷がグランドに放電するようにしたことを特徴とする駆動回路。
- 請求項7に記載の駆動回路において、前記トランジスタのゲート端子を制御信号端子に接続し、前記トランジスタのドレイン端子を負電圧に接続し、前記トランジスタが前記制御信号によってターンオンした場合、前記発光装置における電荷が負電圧端子に放電するようにしたことを特徴とする駆動回路。
- 請求項1に記載の駆動回路において、前記発光装置が有機発光ダイオード(OLED)を含むことを特徴とする駆動回路。
- 請求項1に記載の駆動回路において、前記発光装置が分子発光ダイオードを含むことを特徴とする駆動回路。
- 複数の画素を有する表示装置であって、各々の画素が各々の画素内の発光装置を駆動する駆動回路を有する表示装置において、前記駆動回路が、
前記発光装置に結合され、前記発光装置に選択的に駆動電流を供給する発光装置駆動ユニットと、
前記発光装置駆動ユニットに結合され、前記発光装置駆動ユニットが前記発光装置に駆動電流を供給するとすぐに、制御信号の電圧レベルにしたがって前記発光装置を放電する放電ユニットとを具えることを特徴とする表示装置。 - 請求項12に記載の表示装置において、前記発光装置駆動ユニットに結合され、スキャン信号及びデータ信号を受け、前記スキャン信号及びデータ信号が論理レベル‘1’にある場合、前記発光装置駆動ユニットが前記発光装置に駆動電流を供給できるようにする発光装置選択ユニットをさらに具えることを特徴とする表示装置。
- 請求項13に記載の表示装置において、前記制御信号が次の画素からのスキャン信号を使用することを特徴とする表示装置。
- 請求項14に記載の表示装置において、前記駆動回路内の放電ユニットが、前記次の画素におけるスキャン信号が論理レベル‘1’すなわち高電圧レベルにある場合、前記発光装置を放電することを特徴とする表示装置。
- 請求項12に記載の表示装置において、前記駆動回路内の放電ユニットを接地電位に結合し、電荷が前記発光装置からグランドに放電されるようにしたことを特徴とする表示装置。
- 請求項12に記載の表示装置において、前記駆動回路内の放電ユニットを負電圧に結合し、電荷が前記発光装置から負電圧端子に放電されるようにしたことを特徴とする表示装置。
- 表示装置の駆動方法であって、前記表示装置が複数の画素を有し、各々の画素内の発光装置を駆動する駆動方法において、
前記発光装置の1つに選択的に駆動電流を供給するステップと、
前記発光装置が駆動電流によって駆動される間、制御信号の電圧レベルにしたがって前記発光装置を放電するステップとを含むことを特徴とする駆動方法。 - 請求項18に記載の駆動方法において、前記発光装置の1つに選択的に駆動電流を供給するステップが、前記表示装置に送られたスキャン信号及びデータ信号が論理レベル‘1’すなわち高電圧レベルにある場合、前記発光装置に駆動電流を供給するステップを含むことを特徴とする駆動方法。
- 請求項19に記載の駆動方法において、前記制御信号を、前記表示装置における次の画素のスキャン信号によって供給することを特徴とする駆動方法。
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TW091120826A TW571281B (en) | 2002-09-12 | 2002-09-12 | Driving circuit and method for a display device and display device therewith |
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TW564390B (en) * | 2002-09-16 | 2003-12-01 | Au Optronics Corp | Driving circuit and method for light emitting device |
TW588468B (en) * | 2002-09-19 | 2004-05-21 | Ind Tech Res Inst | Pixel structure of active matrix organic light-emitting diode |
JP3949040B2 (ja) * | 2002-09-25 | 2007-07-25 | 東北パイオニア株式会社 | 発光表示パネルの駆動装置 |
US20060007204A1 (en) * | 2004-06-29 | 2006-01-12 | Damoder Reddy | System and method for a long-life luminance feedback stabilized display panel |
-
2002
- 2002-09-12 TW TW091120826A patent/TW571281B/zh not_active IP Right Cessation
- 2002-10-31 US US10/065,566 patent/US20040051690A1/en not_active Abandoned
-
2003
- 2003-09-12 JP JP2003322057A patent/JP4260586B2/ja not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007179021A (ja) * | 2005-12-02 | 2007-07-12 | Semiconductor Energy Lab Co Ltd | 表示装置および電子機器 |
US8531364B2 (en) | 2005-12-02 | 2013-09-10 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic device |
Also Published As
Publication number | Publication date |
---|---|
US20040051690A1 (en) | 2004-03-18 |
JP4260586B2 (ja) | 2009-04-30 |
TW571281B (en) | 2004-01-11 |
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