JP2011507005A - 画素駆動回路 - Google Patents
画素駆動回路 Download PDFInfo
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- JP2011507005A JP2011507005A JP2010531588A JP2010531588A JP2011507005A JP 2011507005 A JP2011507005 A JP 2011507005A JP 2010531588 A JP2010531588 A JP 2010531588A JP 2010531588 A JP2010531588 A JP 2010531588A JP 2011507005 A JP2011507005 A JP 2011507005A
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- floating gate
- tft
- active matrix
- pixel
- pixel circuit
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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Abstract
Description
有機発光ダイオード、ここでは有機金属系のLEDを含むが、有機発光ダイオードは、ポリマー、小分子、およびデンドリマーなどの材料を用いて、使用される材料に依存するさまざまな色で製造され得る。ポリマー系の有機LEDの例は、国際公開第90/13148号、国際公開第95/06400号、および国際公開第99/48160号に記載され、デンドリマー系の材料の例は、国際公開第99/21935号および国際公開第02/067343号に記載され、いわゆる小分子系のデバイスの例は、米国特許第4,539,507号明細書に記載されている。典型的なOLEDデバイスは2層の有機材料を備え、その一方は、発光ポリマー(LEP)、オリゴマー、または発光低分子量材料のような発光材料の層であり、他方は、ポリチオフェン誘導体またはポリアニリン誘導体のような正孔輸送材料の層である。
しかしながら、改良された画素駆動回路の必要性が存在する。
図1cは、電圧プログラム型OLEDアクティブマトリクス画素回路150の例を示す図である。回路150はディスプレイの各画素に設けられ、Vdd152、接地154、行選択124、および列データ126の各母線が、各画素を相互に接続するように設けられる。このように、各画素は電源接続および接地接続を有し、画素の各行は共通の行選択線124を有し、画素の各列は共通のデータ線126を有する。
B――選択スイッチが有効にされ、基準データ電圧(VHIGH)がフローティングゲートTFT302の入力端子の1つに印加されて(V1=VHIGH)、フローティングゲートTFT302に電流が流れないようにされる(|VFGS|<|Vt|)。VDDはHIGHである。
C――AZがLOW、T3が有効にされる。駆動TFT(T2)の入力V2がドレインに接続されて、T2 302がダイオード接続される。入力V1はまだVHIGHである(V1=VHIGH)。電流がT2を流れ始めて、Vgs/Vdsが増加する。キャパシタC1、C2、およびCgsの間で電荷が再分布する。
D――VDDおよびV1が(Vdataの変化により駆動されて)ΔVだけ低くなる。VD(T2)がLOWになって、OLED301に逆バイアスがかかる。T2を通る電流が向きを変え、有効にされたT3を通ってC2へと流れ込み、容量C2を充電する。電圧V2がHIGHになり、TFT302のフローティングゲートが閾電圧に達するとトランジスタ302のスイッチがオフになる(そしてVtがCgsに記録される)。
E――AZがHIGHになり、T3がオフになり、V2の接続が切れる。
F――VDDおよびV1が(有効にされたT1によって)再びHIGHになり、その結果OLEDが順バイアス状態になる。
G――T2上にプログラムされたデータが、閾電圧Vtでオフセットされる。
Claims (26)
- 複数のアクティブマトリクス画素を有するアクティブマトリクス光電子デバイスであって、前記画素のそれぞれは、前記画素を駆動する薄膜トランジスタ(TFT)と、画素値を記憶する画素キャパシタとを備える画素回路を含み、前記TFTは、フローティングゲートをもつTFTで構成されるアクティブマトリクス光電子デバイス。
- フローティングゲートをもつ前記TFTは、前記TFTのゲートへの1つ以上の接続をもつTFTで構成され、前記ゲート接続は、前記TFTの前記ゲートへの容量的にのみ結合された接続で構成される請求項1に記載のアクティブマトリクス光電子デバイス。
- 前記容量的に結合されたゲート接続は、2つの極板をもつゲート接続キャパシタを備え、前記TFTは、ソース・ドレイン金属層を備え、前記TFTの前記ゲートへの前記容量的に結合された接続は、前記ソース・ドレイン金属層にパターン形成された接続を備え、前記ソース・ドレイン金属層にパターン形成された前記接続は、前記ゲート接続キャパシタの前記極板の一方を備え、前記TFTは、ゲート金属層をさらに備え、前記ゲート金属層は、前記ゲート接続キャパシタの前記極板の第2を備える請求項2に記載のアクティブマトリクス光電子デバイス。
- 前記フローティングゲートは、前記TFTと一体化される請求項1または2に記載のアクティブマトリクス光電子デバイス。
- 前記フローティングゲートは、付随するフローティングゲート容量を有し、前記画素キャパシタは、前記フローティングゲート容量を有する上記請求項のいずれかに記載のアクティブマトリクス光電子デバイス。
- 前記デバイスは、有機発光ダイオード(OLED)ディスプレイを備え、前記画素回路は、前記フローティングゲートTFTによって駆動されるOLEDを含む上記請求項のいずれかに記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、電圧プログラム型画素回路で構成され、前記画素値は、前記フローティングゲートTFTの閾電圧をオフセットするための閾オフセット電圧値で構成される請求項6に記載のアクティブマトリクス光電子デバイス。
- 前記フローティングゲートTFTは、2つのフローティングゲート接続を有し、前記電圧プログラム型画素回路は、第1のフローティングゲート接続を用いて前記閾オフセット電圧値を調整し、第2のフローティングゲート接続を用いて前記画素のプログラミング電圧を記憶するように構成される請求項7に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、前記閾オフセット電圧値と前記プログラミング電圧とを提供する動作が前記フローティングゲートと前記TFTのソース端子またはドレイン端子との間の固有のデバイス容量にプログラミング電圧を記憶させるように構成される請求項8に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、前記画素内に光フィードバックを提供するために、前記TFTのフローティングゲート接続に結合されたフォトダイオードを含む請求項7、8、または9に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路を制御する制御回路をさらに備え、前記制御回路は、前記OLEDがオフに制御され、前記一体化されたフローティングゲートキャパシタに前記閾オフセット電圧値が記憶される第1のサイクルと、前記閾オフセット電圧値により調整されたプログラミング電圧で前記OLEDの明るさが設定される第2のサイクルとの2つのサイクルを有する請求項6ないし10のいずれか1項に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、電流プログラム型画素回路で構成され、前記画素値は、前記画素回路に流されるプログラミング電流に実質的に比例する前記OLEDを通る駆動電流に対応するゲート・ソース電圧値で構成される請求項6に記載のアクティブマトリクス光電子デバイス。
- 前記TFTは、第1のフローティングゲート接続と、第2のフローティングゲート接続との2つのフローティングゲート接続を有し、前記電流プログラム型画素回路は、前記フローティングゲート接続の1つが、前記TFTの有効な閾電圧を変えるための電圧を記憶するキャパシタへの接続を備えるように構成される請求項12に記載のアクティブマトリクス光電子デバイス。
- 前記第1のフローティングゲート接続は、前記フローティングゲートTFTのドレイン接続に結合される請求項13に記載のアクティブマトリクス光電子デバイス。
- 前記第1のフローティングゲート接続は、前記画素回路が前記プログラミング回路によってプログラミングのために選択され得るようにする少なくとも1つの選択TFTを介して、前記TFTの前記ドレイン接続に結合される請求項14に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、前記第2のフローティングゲート接続とフローティングゲートTFTのドレイン接続との間に結合された少なくとも1つの選択TFTを含む請求項13、14、または15に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、前記第1のフローティングゲート接続と前記画素回路のバイアス電圧接続との間に結合された少なくとも1つの選択TFTを含む請求項13、14、または15に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、前記プログラミング電流を前記画素回路へ選択的に提供するために、前記第2のフローティングゲート接続と電流データ線との間に結合された少なくとも1つの選択TFTを含む請求項13ないし17のいずれか1項に記載のアクティブマトリクス光電子デバイス。
- 前記画素駆動回路のプログラミング時に前記OLEDの照明を無効にするための、前記フローティングゲートTFTと前記OLEDとの間に結合された無効化TFTをさらに備える請求項13ないし18のいずれか1項に記載のアクティブマトリクス光電子デバイス。
- 前記フローティングゲートTFTは、2つのフローティングゲート接続を有し、前記画素回路は、前記フローティングゲートTFTの有効な閾電圧制御のために入力端子の一方を用いるように構成される上記請求項のいずれかに記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、前記フローティングゲート接続の他方を用いて前記アクティブマトリクス画素のプログラミングを有効にするように構成される請求項20に記載のアクティブマトリクス光電子デバイス。
- 前記画素回路は、前記フローティングゲートTFTを入力または出力トランジスタとして含む電流ミラー回路または電流コピー回路を備える請求項20または21に記載のアクティブマトリクス光電子デバイス。
- 有機エレクトロルミネッセンスディスプレイのアクティブマトリクス画素回路を駆動する方法であって、前記画素回路は、前記画素を駆動する薄膜トランジスタ(TFT)と、画素値を記憶する画素キャパシタとを備え、前記TFTは、フローティングゲートをもつTFTで構成され、前記フローティングゲートは、付随するフローティングゲート・ソース間容量を有する方法において、前記画素回路をプログラムして前記フローティングゲート・ソース間キャパシタに電圧を記憶させることを含み、前記記憶された電圧が、前記有機エレクトロルミネッセンス表示素子の明るさを定める方法。
- 前記フローティングゲートTFTは、2つのフローティングゲート接続を有し、前記方法は、前記フローティングゲート接続の第1を用いて前記有機エレクトロルミネッセンス表示画素の前記明るさをプログラムし、前記フローティングゲート接続の第2を用いて前記駆動TFTの閾電圧を変えることを含む請求項23に記載の方法。
- フローティングゲート有機薄膜トランジスタ(OTFT)であって、前記薄膜トランジスタのフローティングゲートに容量的に結合された少なくとも1つの入力端子を備えるフローティングゲート有機薄膜トランジスタ。
- 請求項25に記載のフローティングゲート有機薄膜トランジスタを備える画素回路であって、前記回路は、OTFTのドレイン・ソース金属層と前記OTFTのゲート金属層との間のバイアを欠く画素回路。
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US10985234B2 (en) | 2012-08-02 | 2021-04-20 | Samsung Display Co., Ltd. | Organic light emitting diode display |
US10483342B2 (en) | 2012-08-02 | 2019-11-19 | Samsung Display Co., Ltd. | Organic light emitting diode display |
US9899464B2 (en) | 2012-08-02 | 2018-02-20 | Samsung Display Co., Ltd. | Organic light emitting diode display |
JP2018036667A (ja) * | 2012-08-02 | 2018-03-08 | 三星ディスプレイ株式會社Samsung Display Co.,Ltd. | 有機発光表示装置 |
JP2014032379A (ja) * | 2012-08-02 | 2014-02-20 | Samsung Display Co Ltd | 有機発光表示装置 |
US11690266B2 (en) | 2012-08-02 | 2023-06-27 | Samsung Display Co., Ltd. | Organic light emitting diode display with plurality of thin film transistors in portions of curved semiconductor layer |
US9660012B2 (en) | 2012-08-02 | 2017-05-23 | Samsung Display Co., Ltd. | Organic light emitting diode display |
US10734470B2 (en) | 2012-08-02 | 2020-08-04 | Samsung Display Co., Ltd. | Organic light emitting diode display |
US10204976B2 (en) | 2012-08-02 | 2019-02-12 | Samsung Display Co., Ltd. | Organic light emitting diode display |
US11574991B2 (en) | 2012-08-02 | 2023-02-07 | Samsung Display Co., Ltd. | Organic light emitting diode display with semiconductor layer having bent portion |
US11574988B2 (en) | 2012-08-02 | 2023-02-07 | Samsung Display Co., Ltd. | Organic light emitting diode display with scan line between storage capacitor and voltage line |
US11574989B2 (en) | 2012-08-02 | 2023-02-07 | Samsung Display Co., Ltd. | Organic light emitting diode display with thin film transistors in portions of curved semiconductor layer |
US11574990B2 (en) | 2012-08-02 | 2023-02-07 | Samsung Display Co., Ltd. | Organic light emitting diode display with curved channel region |
JP7090412B2 (ja) | 2017-10-30 | 2022-06-24 | ソニーセミコンダクタソリューションズ株式会社 | 画素回路、表示装置、画素回路の駆動方法および電子機器 |
US11289019B2 (en) | 2017-10-30 | 2022-03-29 | Sony Semiconductor Solutions Corporation | Pixel circuit, display device, method for driving pixel circuit, and electronic apparatus |
JP2019082548A (ja) * | 2017-10-30 | 2019-05-30 | ソニーセミコンダクタソリューションズ株式会社 | 画素回路、表示装置、画素回路の駆動方法および電子機器 |
Also Published As
Publication number | Publication date |
---|---|
GB2466749A (en) | 2010-07-07 |
KR20100077003A (ko) | 2010-07-06 |
DE112008002931T5 (de) | 2010-12-02 |
US8314756B2 (en) | 2012-11-20 |
JP5444238B2 (ja) | 2014-03-19 |
GB0723859D0 (en) | 2008-01-16 |
GB2466749B (en) | 2013-05-08 |
CN101903936A (zh) | 2010-12-01 |
CN101903936B (zh) | 2013-09-11 |
WO2009056877A1 (en) | 2009-05-07 |
TW200926112A (en) | 2009-06-16 |
GB201007074D0 (en) | 2010-06-09 |
GB0721567D0 (en) | 2007-12-12 |
US20100253710A1 (en) | 2010-10-07 |
TWI467542B (zh) | 2015-01-01 |
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