JP6942846B2 - 表示装置 - Google Patents
表示装置 Download PDFInfo
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- JP6942846B2 JP6942846B2 JP2020122100A JP2020122100A JP6942846B2 JP 6942846 B2 JP6942846 B2 JP 6942846B2 JP 2020122100 A JP2020122100 A JP 2020122100A JP 2020122100 A JP2020122100 A JP 2020122100A JP 6942846 B2 JP6942846 B2 JP 6942846B2
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
Description
ところが、表示パネルでピクセルの位置によって電源ラインにおける駆動電圧の電圧降下量が異なるため、実際に互いに異なるピクセル駆動電圧がピクセルに供給されることがある。これにより、同じ大きさのデータ電圧がピクセルに供給されても、ピクセルの位置によってOLEDが発光する光の輝度が変わり、同じ輝度で再現されるべき入力映像がピクセルの位置によって異なるように表現できる。
この明細書の他の目的は、電圧降下によるピクセル駆動電圧の変動を補償する表示装置を提供することにある。
この明細書の別の目的は、各位置ごとにピクセル駆動電圧の変化をリアルタイムで検出する構成を提供することにある。
また、実際供給されるピクセル駆動電圧に基づいてガンマ基準電圧をリアルタイムで変更しながら生成することにより、ピクセル駆動電圧の降下による輝度変動を最小限に抑えることができる。
また、ピクセルの位置やピクセル駆動電圧の降下に影響を与える入力映像のパターンとは無関係に、同じデータ入力に対して同じ輝度でピクセルを発光させることができるため、予測可能で、正常な画像表示を可能にする。
ピクセルアレイにおいて、同じ水平ラインに配置されるピクセルPXLは、データライン14のいずれか一つ、ゲートライン15のいずれか一つ(または第1ゲートライン15_1のいずれか一つと第2ゲートライン15_2のいずれか一つ)に接続されてピクセルラインを形成する。ピクセルPXLは、ゲートライン15を介して印加されるスキャン信号と発光信号に応答してデータライン14と電気的に接続され、データ電圧の入力を受けてデータ電圧に相応する電流でOLEDを発光させる。同じピクセルラインに配置されたピクセルPXLは、同じゲートライン15から印加されるスキャン信号と発光信号に基づいて同時に動作する。
図4のピクセル回路は、内部補償回路、発光素子、発光素子に電流を供給する駆動素子DTを含む。前記発光素子はOLEDで実現できる。前記内部補償回路は、多数のスイッチトランジスタT1〜T6及びストレージキャパシタCstで構成できる。前記内部補償回路は、駆動素子DTのしきい電圧Vthをサンプリングして駆動素子DTのしきい電圧Vthだけ駆動素子DTのゲート電圧を補償することができる。駆動素子DTとスイッチトランジスタT1〜T6それぞれは、Pチャネルトランジスタで実現でき、これに限定されない。
図6に示すように、ピクセル駆動電圧Vddをピクセルに供給する第1電源ライン101は、メッシュ状に接続され、横方向(またはゲートラインが延びる方向)に延びる第1電源ライン101の横配線は、水平ライン(またはピクセルライン)ごとに配置され、当該水平ラインにあるピクセルにピクセル駆動電圧Vddを供給することができる。または、横方向に延びる第1電源ライン101の横配線は、複数の水平ラインに一つずつ配置されてもよい。
11 タイミングコントローラ
12 データ駆動回路
13 ゲート駆動回路
14 データライン
15 ゲートライン
16 電源部
17 ガンマ基準電圧生成部
Claims (10)
- 複数のピクセルを備える表示パネルと、
ガンマ補償電圧に基づいてピクセルデータをデータ電圧に変換して複数のデータラインを介して前記複数のピクセルに供給するデータ駆動回路と、
前記表示パネルの各水平ラインのピクセルに接続されるゲートラインを介してスキャン信号を供給するゲート駆動回路と、
電源ラインを介して前記複数のピクセルにピクセル駆動電圧を供給する電源部と、
前記電源部に接続されたセンシングラインと、
を含み、
前記電源部は、ガンマ基準電圧調整部を含み、
前記センシングラインは、前記表示パネルの複数の位置で前記スキャン信号に同期して検出されるピクセル駆動電圧の測定値を、前記ガンマ基準電圧調整部に伝達するように構成され、
前記ガンマ基準電圧調整部は、前記ピクセル駆動電圧の測定値に基づいて前記ガンマ補償電圧の範囲を調整するように構成される、表示装置。 - 前記スキャン信号に応じて前記電源ラインと前記センシングラインとの接続を制御するセンシングスイッチトランジスタをさらに含んで構成されることを特徴とする、請求項1に記載の表示装置。
- 前記センシングラインは、前記表示パネルにおける表示領域の外側領域に設けられ、
前記センシングスイッチトランジスタは、前記表示パネルにメッシュ状に形成される前記電源ラインのうち、前記ゲートラインが延びる方向に延びる横配線を前記センシングラインに接続することを特徴とする、請求項2に記載の表示装置。 - 前記センシングスイッチトランジスタは、各水平ラインに配置され、当該水平ラインのピクセルに接続されるゲートラインに供給されるスキャン信号に応じて、当該水平ラインに前記ピクセル駆動電圧を供給する横配線を前記センシングラインに接続することを特徴とする、請求項3に記載の表示装置。
- 前記ガンマ基準電圧調整部は、前記センシングラインを介して所定数の水平期間ごとに1回ずつ前記ピクセル駆動電圧の測定値を受けて前記ガンマ補償電圧の範囲を調整することを特徴とする、請求項3に記載の表示装置。
- ガンマ基準電圧調整部は、前記電源部が出力する前記ピクセル駆動電圧の基準値を前記測定値と比較して、前記ガンマ補償電圧の範囲を限定する高電位ガンマ入力電圧と低電位ガンマ入力電圧を調整することを特徴とする、請求項1に記載の表示装置。
- 前記ガンマ基準電圧調整部は、前記基準値と測定値との差に対応する第1信号を出力する第1差動増幅器、内部高電位電圧と前記第1信号との差を前記高電位ガンマ入力電圧として出力する第2差動増幅器、及び内部低電位電圧と前記第1信号との差を前記低電位ガンマ入力電圧として出力する第3差動増幅器を含むことを特徴とする、請求項6に記載の表示装置。
- 前記高電位ガンマ入力電圧と前記低電位ガンマ入力電圧を用いて前記ガンマ補償電圧を生成するガンマ補償電圧生成部をさらに含むことを特徴とする、請求項6または7に記載の表示装置。
- 前記第1差動増幅器の増幅比は1以上であることを特徴とする、請求項7に記載の表示装置。
- 前記電源部は入力映像のパターンに基づいて前記ピクセル駆動電圧を増加させることを特徴とする、請求項1に記載の表示装置。
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