JP2018072827A - 有機発光表示装置 - Google Patents
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Abstract
【解決手段】本発明に係る有機発光表示装置は、有機発光ダイオードと、これを駆動する駆動TFTを含むピクセル複数個が備えられた表示パネル及びセンシングラインを介して1つ以上のピクセルに接続されてそのピクセルの駆動特性を検出するセンシング回路を含み、センシング回路は、完全差動増幅器の反転及び非反転入力端子に接続される隣接する2つのセンシングラインのそれぞれに流れる電流を積分する積分器、積分器の2つの積分出力をそれぞれサンプリングするサンプリング部及び、サンプリング部のサンプリング出力の動作範囲を調節するスケーラで構成される複数個のセンシングユニット、センシングユニットの1つ以上のスケーラの出力を差動増幅する差動増幅器及び差動増幅器の出力をデジタルセンシング値に変換するアナログ−デジタル変換器(ADC)を含むことができる。
【選択図】図8
Description
Claims (11)
- 完全差動増幅器の反転入力端子と非反転入力端子に接続される隣接する2つのセンシングラインのそれぞれに流れる電流を積分する積分器であって、前記のセンシングラインは、表示パネルのピクセルを構成する有機発光ダイオードを駆動する駆動TFTに接続される、積分器と、
前記積分器の2つの積分出力をそれぞれサンプリングするサンプリング部と、
前記サンプリング部の1つ以上のサンプリング出力を差動増幅する差動増幅器と、
前記差動増幅器の出力をデジタルセンシング値に変換するアナログ−デジタル変換器(ADC)を含む、有機発光ダイオード駆動特性検出回路。 - 前記サンプリング部の2つのサンプリング出力をそれぞれ前記ADCの動作範囲に変換して前記差動増幅器に出力するスケーラをさらに含むことを特徴とする、請求項1に記載の有機発光ダイオード駆動特性検出回路。
- 前記有機発光ダイオードを発光させるディスプレイ駆動時に接続を切って、前記有機発光ダイオードの駆動特性を検出するセンシング駆動時に接続するように、前記反転入力端子と非反転入力端子を前記2つのセンシングラインにそれぞれ接続する第1及び第2センシングスイッチと、
前記サンプリング部の2つのサンプリング出力を前記差動増幅器の2つの入力端子にそれぞれ接続する第1及び第2モードスイッチをさらに含み、
前記積分器は、前記完全差動増幅器の反転入力端子と非反転出力端子を接続する第1キャパシタと第1リセットスイッチ及び前記完全差動増幅器の非反転入力端子と反転出力端子を接続する第2キャパシタと第2リセットスイッチを含み、前記完全差動増幅器の出力共通端子は、前記駆動TFTのソースに印加される基準電圧に接続され、
前記サンプリング部は、第1及び第2サンプリングキャパシタ、並びに、前記第1及び第2サンプリングキャパシタの第1端子をそれぞれ前記非反転出力端子と反転出力端子に接続する第1及び第2サンプリングスイッチを含み、前記第1及び第2サンプリングキャパシタの第2端子は、前記ADCの動作範囲に関連する第2基準電圧に接続されることを特徴とする、請求項1に記載の有機発光ダイオード駆動特性検出回路。 - 前記第1モードスイッチは、第1サンプリング出力または第2サンプリング出力を選択的に前記差動増幅器の第1入力端子に接続し、前記第2モードスイッチは、前記第2サンプリング出力または第3基準電圧を選択的に前記差動増幅器の第2入力端子に接続することを特徴とする、請求項3に記載の有機発光ダイオード駆動特性検出回路。
- 前記2つのセンシングラインのセンシング値の差を用いる第1モードにおいて、前記第1モードスイッチは前記差動増幅器の第1入力端子を前記第1サンプリング出力に接続し、前記第2モードスイッチは前記差動増幅器の第2入力端子を前記第2サンプリング出力に接続し、
前記2つのセンシングラインのそれぞれのセンシング値と所定の基準値との差を用いる第2モードにおいて、前記第1モードスイッチは前記差動増幅器の第1入力端子を前記第1サンプリング出力に接続し、前記第2モードスイッチは前記差動増幅器の第2入力端子を前記第3基準電圧に接続するか、または、前記第1モードスイッチは前記差動増幅器の第1入力端子を前記第2サンプリング出力に接続し、前記第2モードスイッチは前記差動増幅器の第2入力端子を前記第3基準電圧に接続することを特徴とする、請求項4に記載の有機発光ダイオード駆動特性検出回路。 - 前記差動増幅器の第1入力端子を第3基準電圧に接続する第1基準スイッチ及び前記差動増幅器の第2入力端子を前記第3基準電圧に接続する第2基準スイッチをさらに含むことを特徴とする、請求項3に記載の有機発光ダイオード駆動特性検出回路。
- 前記2つのセンシングラインのセンシング値の差を用いる第1モードにおいて、前記第1モードスイッチは前記差動増幅器の第1入力端子を前記第1サンプリング出力に接続し、前記第2モードスイッチは前記差動増幅器の第2入力端子を前記第2サンプリング出力に接続し、
前記2つのセンシングラインのそれぞれのセンシング値と所定の基準値との差を用いる第2モードにおいて、前記第1モードスイッチは前記差動増幅器の第1入力端子を前記第1サンプリング出力に接続し、前記第2基準スイッチは前記差動増幅器の第2入力端子を前記第3基準電圧に接続するか、または前記第2モードスイッチは前記差動増幅器の第2入力端子を前記第2サンプリング出力に接続し、前記第1基準スイッチは前記差動増幅器の第1入力端子を前記第3基準電圧に接続することを特徴とする、請求項6に記載の有機発光ダイオード駆動特性検出回路。 - 初期化期間において、前記第1及び第2センシングスイッチ、前記第1及び第2リセットスイッチ、及び前記第1及び第2サンプリングスイッチがターン−オンされ、前記駆動TFTのソースに前記基準電圧が印加され、
サンプリング期間に、前記第1及び第2リセットスイッチがターン−オフされ、前記2つのセンシングラインの内、いずれか1つに接続された第1駆動TFTのゲートにセンシング用データ電圧が印加され、前記第1駆動TFTがターン−オンされ、前記2つのセンシングラインの内、他の1つに接続された第2駆動TFTのゲートに所定のデータ電圧が印加され、前記第2駆動TFTがターン−オフされ、前記第1及び第2サンプリングキャパシタの内、いずれかが1つが前記積分器が前記第1駆動TFTのソースに流れる電流を積分した第1積分出力を貯蔵し、前記第1及び第2サンプリングキャパシタの内、他の1つが前記積分器が前記第2駆動TFTのソースに流れる電流を積分した第2積分出力を貯蔵し、
変換期間に、前記第1及び第2サンプリングスイッチがターン−オフされ、前記第1及び第2モードスイッチがターン−オンされて、前記差動増幅器とADCが前記第1サンプリングキャパシタと第2キャパシタが貯蔵された2つの積分出力の差をデジタルに変換することを特徴とする、請求項3に記載の有機発光ダイオード駆動特性検出回路。 - 各ピクセルが有機発光ダイオードとこれを駆動する駆動TFTを含む、複数個のピクセルが備えられたパネルと、
センシングラインを介して1つ以上のピクセルに接続されそのピクセルの駆動特性を検出するセンシング回路を含み、
前記センシング回路は、
各センシングユニットが、完全差動増幅器の反転及び非反転入力端子に接続される隣接する2つのセンシングラインのそれぞれに流れる電流を積分する積分器と、前記積分器の2つの積分出力をそれぞれサンプリングするサンプリング部と、前記サンプリング部のサンプリング出力の動作範囲を調節するスケーラで構成される、複数個のセンシングユニットと、
前記センシングユニットの1つ以上のスケーラの出力を差動増幅する差動増幅器と、
前記差動増幅器の出力をデジタルセンシング値に変換するアナログ−デジタル変換器(ADC)を含むことを特徴とする有機発光表示装置。 - 前記センシングユニットは、
前記有機発光ダイオードを発光させるディスプレイ駆動時に接続を切って、前記有機発光ダイオードの駆動特性を検出するセンシング駆動時に接続するように、前記反転入力端子と非反転入力端子を前記2つのセンシングラインにそれぞれ接続する第1及び第2センシングスイッチと、
前記サンプリング部の2つのサンプリング出力を前記差動増幅器の2つの入力端子にそれぞれ接続する第1及び第2モードスイッチをさらに含み、
前記積分器は、前記完全差動増幅器の反転入力端子と非反転出力端子を接続する第1キャパシタと第1リセットスイッチ及び前記完全差動増幅器の非反転入力端子と反転出力端子を接続する第2キャパシタと第2リセットスイッチを含み、前記完全差動増幅器の出力共通端子は、前記駆動TFTのソースに印加される基準電圧に接続され、
前記サンプリング部は、第1及び第2サンプリングキャパシタと、前記第1及び第2サンプリングキャパシタの第1端子をそれぞれ前記非反転出力端子と反転出力端子に接続する第1及び第2サンプリングスイッチを含み、前記第1及び第2サンプリングキャパシタの第2端子は、前記ADCの動作範囲に関連する第2基準電圧に接続されることを特徴とする、請求項9に記載の有機発光表示装置。 - 第1期間において、奇数センシングラインに接続されるピクセルに前記駆動TFTをターン−オンさせるセンシング用データ電圧を印加し、偶数センシングラインに接続されるピクセルに前記駆動TFTをターン−オンさせない所定のデータ電圧を印加し、前記複数個のセンシングユニットを同時に駆動して、複数個の第1及び第2スケーラ出力を得て、各センシングユニットの第1及び第2モードスイッチを制御して前記複数個のセンシングユニットを順次前記差動増幅器に接続し、各センシングユニットが前記差動増幅器に接続するとき、前記差動増幅器とADCを駆動して、当該センシングユニットに関する奇数センシングラインに接続されたピクセルに対するデジタルセンシング値を出力し、
前記第1期間の以後の第2期間に、奇数センシングラインに接続されるピクセルに前記駆動TFTをターン−オンさせない所定のデータ電圧を印加し、偶数センシングラインに接続されるピクセルに前記駆動TFTをターン−オンさせるセンシング用データ電圧を印加し、前記複数個のセンシングユニットを同時に駆動して、複数個の第1及び第2のスケーラ出力を得て、各センシングユニットの第1及び第2モードスイッチを制御して前記複数個のセンシングユニットを順次前記差動増幅器に接続し、各センシングユニットが、前記差動増幅器に接続するとき、前記差動増幅器とADCを駆動して、該当センシングユニットに関する偶数センシングラインに接続されたピクセルに対するデジタルセンシング値を出力することを特徴とする、請求項10に記載の有機発光表示装置。
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TWI770713B (zh) * | 2019-12-16 | 2022-07-11 | 南韓商樂金顯示科技股份有限公司 | 顯示裝置及驅動顯示裝置的方法 |
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JP6537571B2 (ja) | 2019-07-03 |
CN107978259B (zh) | 2021-01-22 |
US10347692B2 (en) | 2019-07-09 |
US20180114815A1 (en) | 2018-04-26 |
CN107978259A (zh) | 2018-05-01 |
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KR20180045937A (ko) | 2018-05-08 |
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