JP6144250B2 - 駆動素子の電気的特性の偏差を補償することができる有機発光表示装置 - Google Patents
駆動素子の電気的特性の偏差を補償することができる有機発光表示装置 Download PDFInfo
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Description
前記タイミングコントローラは、前記センシング用データ電圧の大きさに応じて、前記第1及び第2センシング&サンプリング期間でのセンシング期間を互いに異なるように制御し、前記センシング期間は、前記センシング用データ電圧の大きさに反比例するように調整される。
タイミングコントローラ11は、駆動TFT(DT)に流れるソース−ドレイン間電流(Ids)を補償アルゴリズムに適用して、偏差値(しきい値電圧偏差(△Vth)と移動度偏差(△K))と偏差補償のための補償データ(Vth+△Vth、K+△K)を導出する。補償アルゴリズムは、ルックアップテーブルまたは、計算ロジックで実現することができる
図5及び図6は、センシング性能向上のために、本発明で提案するマルチタイム電流センシング方式の一駆動波形と駆動手順を示す。図7は、本発明で提案するマルチタイム電流センシング方式の他の駆動波形を示す。図5〜図7において、本発明のマルチタイム電流センシングは、2回の電流センシングが例示されているが、本発明の技術的思想は、3回以上の電流センシングにも適用することができる。
すなわち、前記第1レベル(LV1)は、全体の階調区間で所定範囲の低階調電流値と所定範囲の高階調電流値の内いずれか1つに対応する電圧の大きさとすることができ、前記第第2レベル(LV2)は、前記全体階調区間で、前記所定範囲の低階調電流値と前記所定範囲の高階調電流値の内、残りの一つに対応する電圧とすることができる。
Claims (5)
- OLED、当該OLEDの発光量を制御する駆動TFT、をそれぞれ含み、
データラインの内のいずれか一つ、ゲートラインの内のいずれか一つ、及びセンシングラインの内のいずれか一つ、にそれぞれ接続された複数の画素が形成された表示パネルと、
センシング駆動時、1ラインセンシングオンタイムに対応するセンシング用ゲートパルスを生成した後、行順次方式で前記ゲートラインに順次供給するゲート駆動回路と、
前記センシング駆動時、前記1ラインセンシングオンタイム内で、センシング用のデータ電圧を生成して、前記データラインに供給する複数のDACと、前記センシングラインを介して入力される前記画素のそれぞれの駆動TFTのソース‐ドレイン間の電流を積分する複数の電流積分器と、前記電流積分器の出力を順次デジタル処理してデジタルセンシング値を出力するADCを含むデータ駆動回路と、
前記ゲート駆動回路と、前記データ駆動回路の動作を制御して、前記1ラインセンシングオンタイム内で、第1レベルのセンシング用データ電圧による第1ソース‐ドレイン電流値を積分した後、第2レベルの前記センシング用データ電圧による第2ソース‐ドレイン電流値を積分するタイミングコントローラを備え、
前記1ラインセンシングオンタイム内の、前記第1レベルのセンシング用データ電圧と、前記第2レベルのセンシング用データ電圧とは、その大きさが異なり、
前記タイミングコントローラは、前記センシング用データ電圧の大きさに応じて、前記1ラインセンシングオンタイム内に生成される第1及び第2センシング&サンプリング期間でのセンシング期間の長さを互いに異なるように制御する、すなわち前記センシング期間の長さは、前記センシング用データ電圧の大きさに反比例するように調整されることを特徴とする有機発光表示装置。 - 前記第1レベルは、全体の階調区間において、所定範囲の低階調電流値と所定範囲の高階調電流値のいずれか1つに対応する電圧の大きさで入力され、
前記第2レベルは、前記全体の階調区間において、前記所定範囲の低階調電流値と前記所定範囲の高階調電流値の残りの一つに対応する電圧の大きさで入力されることを特徴とする、請求項1に記載の有機発光表示装置。 - 前記タイミングコントローラは、前記ゲート駆動回路の動作を制御して、前記センシング用ゲートパルスのオンパルス区間が、前記1ラインセンシングオンタイム内に2つ以上含まれるように、前記センシング用ゲートパルスをマルチパルスの形で生成することを特徴とする、請求項1に記載の有機発光表示装置。
- 前記電流積分器に含まれる積分キャパシターの静電容量を調整するための静電容量制御部をさらに含み、
前記積分キャパシターは、アンプの反転入力端に並列接続された複数のキャパシターを含み、前記キャパシターのそれぞれの他端は、互いに異なる静電容量調整用スイッチを介して、前記アンプの出力端に接続され、
前記タイミングコントローラは、前記ADCから入力されるデジタルセンシング値を分析して、前記静電容量制御部の動作を制御して、ADCの下限値及び上限値に対応するデジタルセンシング値に応じて、前記静電容量調整用スイッチをオン/オフさせるためのスイッチング制御信号を生成することを特徴とする、請求項1に記載の有機発光表示装置。 - 前記ADCの入力電圧範囲を決定する、ADCの基準電圧を調整するためのプログラマブル電圧調整ICをさらに含み、
前記タイミングコントローラは、デジタルセンシング値を分析して、前記プログラマブル電圧調整ICの動作を制御して、ADCの下限値及び上限値に対応するデジタルセンシング値に応じて、前記ADCの基準電圧を調整できることを特徴とする、請求項1に記載の有機発光表示装置。
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CN105321455A (zh) | 2016-02-10 |
US20150379937A1 (en) | 2015-12-31 |
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TW201601136A (zh) | 2016-01-01 |
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