JP2018197864A - ディスプレイにおける輝度補償 - Google Patents
ディスプレイにおける輝度補償 Download PDFInfo
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- 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
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- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
本出願は、2012年11月5日に出願した継続中の米国暫定出願第61/722,496号「ディスプレイにおける輝度補償」の優先権を主張しており、この出願は全体が引用により組み込まれている。
ここで、Iは駆動トランジスタ206を流れる電流、VDATAはデータライン116からの輝度信号の電圧、VDDは電圧供給ライン109の電圧、スレッシュホールド電圧VTH<0、及びk=μCW/Lである。ゲート誘電体の表面キャパシタンスはC、トランジスタの移動度はμ、トランジスタのチャンネル長さに対するチャンネル幅の比はW/Lである。
で表すことができる。ここで、Viは、位置iにおける特定のピクセル103に見られる供給電圧ライン109からの供給電圧であり、VDD0は、ディスプレイ装置100の入力点における供給電圧ライン109の電圧であり、rは、供給電圧ライン109の隣接するピクセル103間のセグメントの抵抗であり、nは、列C1−Cyのピクセル103の数であり、Imは、ピクセルm(1からn)を流れる電流である。従って、各ピクセル103について、式2は、IR降下を考慮して、式1におけるVDDを置き換えている。
ここで、ΔVi,mは、位置mにおける第2電圧の電流の変化(ΔIm)に対する、位置iにおける第1ピクセル103の供給電圧の変化である。供給電圧の変化に対するあるピクセルにおける電流の変化は、VDDに対する式1の導関数を取ることによって近似することができる。式1及び3を用いて、位置mにおける第2ピクセル103の電流の変化に起因する位置iにおける第1ピクセル103の電流の変化は、以下の式を用いて表すことができる。
ここで、ΔIi,mは、位置mにおける第2ピクセルの電流の変化(ΔIm)に起因する位置iにおける第1ピクセル103の電流の変化であり、ΔVi,mは、式3に対応するとともに、VDD(i,m−1)は、位置mにおけるピクセルがその電流を変化させる直前に位置iにおけるピクセルによってみられる電圧供給ライン109への電圧を表し、IR降下が考慮されている。従って、式4は、IR降下とクロストークの効果を考慮した場合の、ピクセル103の電流の変化の推定値を提供する。このように、例えば、式4を用いて、ピクセル103のIR降下とクロストークの効果を認識することができる。ΔVi,mが小さい状態では、式4は、以下の通り近似できる。
を認識する。この結果、ディスプレイ装置100は、例えば、値を保存しているルックアップテーブルに問い合わせを行う、あるいは、ディスプレイ装置が、例えば、駆動電流の関数としてピクセル103の輝度をモデルにした式を用いて、この値を計算することができる。
ΔItarget(m)をΔImで置き換えて式3を用いて、ピクセル103で見られる供給電圧の変化を認識することもできる。例えば、m=iのとき、ΔVi,i=−i×r×ΔItarget(i)となるので、リフレッシュ後の電流の変化は、ΔVi,i=−k×(VDATA(i)−VDD(i,i−1)−VTH)×ΔVi,iにより式5から得られる。ここで、VDD(i,i−1)は、ピクセルをリフレッシュする前の位置iにおけるピクセルに見られる電源ライン109の値である。VDD(i,i−1)は、式2を用いて、その時の列にある各ピクセルの実電源ライン値を減算することで計算できる、あるいは、連続的に列をリフレッシュする場合、VDD(i,i−1)を記録して、各ピクセルについてのルックアップテーブル中で更新することができる。このように電源の変化及びピクセル103がリフレッシュされることによるピクセル103の電流の変化を認識できる。
このように、ピクセル103のIR降下とクロストーク効果を考慮した輝度信号の値を認識することができる。認識したVDATAの値は、データライン116に補償輝度信号として印加され、ピクセル103をリフレッシュすることができる。ディスプレイ装置100中の全ピクセル103をリフレッシュするサイクルにおいて、ピクセル103の平均電流はターゲット電流とほぼ同じであり、これがピクセル103の所望の輝度となる。このようにして、ディスプレイのビューアは、所望の輝度にあるピクセル103を視覚的に把握することができる。更に、その他のピクセル103を上述した手順と同じ手順でリフレッシュできる。その列にあるすべてのピクセルについて同じステップを繰り返すことで、ピクセルの全列についてIR降下を補償することになる。
Claims (20)
- ディスプレイ装置のために、当該ディスプレイ装置の供給電圧ラインで電圧供給される複数のピクセルのうちの一のピクセルのIR電圧降下の効果を認識するステップであって、
前記一のピクセルについて、前記供給電圧ラインで電圧供給される複数のピクセルのうちのその他のピクセルをリフレッシュすることによる電流に関連する複数の電流値を計算するステップであって、複数の電流値のそれぞれが、その他のピクセルのピクセルのリフレッシュの間の前記一のピクセルに関する電流に対応するステップと、
前記複数の電流値に基づいて前記一のピクセルの値を認識するステップと、
を具える、認識するステップと;
前記値の少なくとも一部に基づいて前記一のピクセルの輝度信号を生成するステップであって、当該輝度信号が前記一のピクセルのIR電圧降下の効果を補償する輝度信号である、ステップと;
を具えることを特徴とする方法。 - 請求項1に記載の方法において、前記値を認識するステップが更に、前記複数の電流値を平均化するステップを具えることを特徴とする方法。
- 請求項1に記載の方法において、前記一のピクセルが、有機発光ダイオード(OLED)であることを特徴とする方法。
- 請求項1に記載の方法において、前記ディスプレイ装置が、活性マトリックス有機発光ダイオード(AMOLED)パネルを具えることを特徴とする方法。
- 請求項1に記載の方法において、前記ピクセルが、縦型発光トランジスタを具えることを特徴とする方法。
- 請求項1に記載の方法において、活性マトリックス発光トランジスタパネルが、前記ピクセルを具えることを特徴とする方法。
- 請求項1に記載の方法において、前記輝度信号が電圧であることを特徴とする方法。
- 請求項1に記載の方法において、前記輝度信号が電流であることを特徴とする方法。
- 請求項1に記載の方法において、前記複数のピクセルが、前記ディスプレイ装置の列にあることを特徴とする方法。
- 活性マトリックスディスプレイを駆動する方法において:
ディスプレイ装置に関して、共通の供給電圧によって電圧供給される複数のピクセルに対応するIR電圧降下の値を計算するステップであって、
前記複数のピクセルの各ピクセルについて、あるシーンのフレームを表示する前記複数のピクセルのうちのその他のピクセルをリフレッシュすることによる電流に起因するIR電圧降下の値を計算するステップであって、前記IR電圧降下の個々の値が、その他のピクセルのうちの一をリフレッシュする間に一のピクセルによって生じるIR電圧降下の効果に対応する、ステップと、
前記複数のピクセルの各ピクセルについて、前記IR電圧降下の値及び前記フレームのディスプレイに対応する輝度に基づいて輝度信号を認識するステップと、
を具える、計算するステップと;
前記複数のピクセルの各々に前記IR電圧降下を補償するデータライン信号を提供するステップであって、当該データライン信号が、前記複数のピクセルの各ピクセルについての前記輝度信号を有する、ステップと;
を具えることを特徴とする方法。 - 請求項10に記載の方法において、前記複数のピクセルのうちの特定のピクセルの瞬間輝度が、前記複数のピクセルのその他のピクセルがリフレッシュされるときに変化することを特徴とする方法。
- 請求項11に記載の方法において、前記特定のピクセルの輝度信号が、前記その他の各ピクセルがリフレッシュされるときに所定の時間インターバル内で変化する瞬間輝度の時間平均であることを特徴とする方法。
- 請求項10に記載の方法において、前記複数のピクセルがピクセルマトリックスの列にあることを特徴とする方法。
- 請求項10に記載の方法において、前記シーンの一連のフレームの次のフレームについてIR電圧降下の値が計算されることを特徴とする方法。
- ディスプレイ装置において;
共通の供給電圧ラインで供給されるピクセルラインを具えるピクセルマトリックスと;
輝度コントローラであって;
前記ディスプレイ装置について、前記ピクセルラインのうちの一のラインの一のピクセルにおけるIR電圧降下の効果の測定であって、
前記ピクセルについて、前記ラインのその他のピクセルのリフレッシュサイクルの間の前記一のラインのその他のピクセルによる電流に関連する複数の電流値を計算し、前記複数の電流値のそれぞれは、前記その他のピクセルをリフレッシュする間のピクセルについての電流に対応し、前記ピクセルについての前記複数の電流値を平均化して、前記ピクセルに関連する平均ピクセル輝度を測定することを具える測定をするように構成するとともに;
前記ピクセルに関連する平均ピクセル輝度の少なくとも一部に基づいて前記ピクセルの輝度信号を生成するように構成した;
輝度コントローラと、を具えることを特徴とするディスプレイ装置。 - 請求項15に記載のディスプレイ装置が、前記ピクセルマトリックスを具える、活性マトリックス有機発光ダイオード(AMOLED)パネルを具えることを特徴とするディスプレイ装置。
- 請求項15に記載のディスプレイ装置において、前記ピクセルのラインが、前記ピクセルマトリックスの列であることを特徴とするディスプレイ装置。
- 請求項15に記載のディスプレイ装置において、前記ピクセルが、縦型発光トランジスタを具えることを特徴とするディスプレイ装置。
- 請求項15に記載のディスプレイ装置において、前記ピクセルが、前記輝度信号の少なくとも一部に基づいて発光デバイスを流れる電流量を制御するように構成した駆動トランジスタを具えることを特徴とするディスプレイ装置。
- 請求項15に記載のディスプレイ装置において、前記輝度コントローラが、前記ディスプレイ装置の回路を処理することによって実行可能なアプリケーションを具えることを特徴とするディスプレイ装置。
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KR102010113B1 (ko) | 2012-11-30 | 2019-08-12 | 유니버시티 오브 플로리다 리서치 파운데이션, 아이엔씨. | 양극성 수직 전계 효과 트랜지스터 |
US8881080B2 (en) * | 2012-12-21 | 2014-11-04 | Qualcomm Incorporated | Method and apparatus for enhanced static IR drop analysis |
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2013
- 2013-11-05 JP JP2015540854A patent/JP6426102B2/ja active Active
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KR20230051505A (ko) | 2020-08-21 | 2023-04-18 | 제이에스알 가부시끼가이샤 | 디스플레이 |
US11963413B2 (en) | 2020-08-21 | 2024-04-16 | Jsr Corporation | Display |
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CN104769661B (zh) | 2017-07-18 |
CN104769661A (zh) | 2015-07-08 |
EP2915161B1 (en) | 2020-08-19 |
JP2016504612A (ja) | 2016-02-12 |
US20150269887A1 (en) | 2015-09-24 |
US10089930B2 (en) | 2018-10-02 |
EP2915161A4 (en) | 2016-06-08 |
KR20150082514A (ko) | 2015-07-15 |
JP6426102B2 (ja) | 2018-11-21 |
EP2915161A1 (en) | 2015-09-09 |
KR102084288B1 (ko) | 2020-03-03 |
WO2014071343A1 (en) | 2014-05-08 |
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