JP5397219B2 - アクティブマトリックス表示装置用の安定な駆動スキーム - Google Patents
アクティブマトリックス表示装置用の安定な駆動スキーム Download PDFInfo
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Description
本発明の1側面によると、少なくとも1つのピクセル回路を有するピクセルアレイの動作方法が提供される。この方法は、各フレーム周期において、該ピクセル回路をプログラミングし、該ピクセル回路を駆動し、そして次のフレーム周期の前に該ピクセル回路へのストレス作用を緩和する各工程を含む、1つのピクセル回路用のフレーム周期を規定するオペレーションサイクルを反復することを含む。
本発明のピクセルアレイの動作方法におけるいくつかの特徴を下記に記す。
・前記緩和工程が該ピクセル回路をその発光デバイスの消光を生じさせることを含む、
・前記緩和工程が、前記駆動工程とは逆極性で該ピクセル回路にバイアスをかけることを含む、
・前記ピクセル回路が駆動トランジスタと、発光デバイスと、該駆動トランジスタ及び発光デバイスに接続された記憶キャパシタとを備え、そして
前記プログラミング工程が第1サイクルで駆動トランジスタのゲートソース間電圧を発生させることを含む、
・前記ピクセル回路がスイッチを備え、前記駆動トランジスタがゲート端子並びに第1及び第2の端子を備え、駆動トランジスタのゲート端子が前記スイッチを介してデータラインに接続され、駆動トランジスタの第1及び第2の端子の一方が電源ラインに接続され、そして前記電圧発生が、前記電源ラインを第1の電圧に充電し、前記データラインを第1の電圧とは逆極性の第2の電圧に充電することを含む、
・前記プログラミング工程が、第1サイクルに続く第2サイクルで、発光デバイス及び駆動トランジスタと記憶キャパシタとの間の接続点が駆動トランジスタの閾値電圧であるようにピクセル回路に対して動作することを含む、
・前記プログラミング工程が、第1サイクルに続く第2サイクルで、前記記憶キャパシタに記憶された電圧が駆動トランジスタの閾値電圧であるようにピクセル回路に対して動作することを含む、
・前記プログラミング工程が、第1サイクルに続く第2サイクルで、前記電源ラインを第3の電圧に充電し、この第3の電圧がピクセル回路を駆動させるための電圧と同一である、
・前記プログラミング工程が、第1サイクルに続く第2サイクルで、前記駆動トランジスタの第1及び第2端子の一方を、駆動トランジスタがターンオフする点まで充電することを含む、
・前記プログラミング工程が、第2サイクルに続く第3サイクルで、データラインを、プログラミングデータと関連する電圧まで充電することを含む、
・前記プログラミング工程が、第2サイクルに続く第3サイクルで、後での式(1)により規定される電圧でピクセル回路をプログラミングすることを含む、
・駆動トランジスタの第1端子が電源ラインに接続され、駆動トランジスタの第2端子が発光デバイスに接続され、記憶キャパシタの第1の端子が駆動トランジスタのゲート端子に接続され、記憶キャパシタの第2の端子が駆動トランジスタの第2の端子及び発光デバイスに接続されている。
後述するように、ピクセル回路を各フレームの一部の時間だけ弛緩させることにより、駆動デバイス(即ち、図2のTFT24及び26)、OLED(例えば、図1の22)、又はそれらの組み合わせの経時劣化を包含する、ピクセルの経時劣化を抑制することができる。
図6において、iはピクセルアレイにおけるi番目の横列を表し、kは該ピクセルアレイにおけるk番目の横列を表し、mは該ピクセルアレイにおけるm番目の縦列を表し、そしてl(エル)は該ピクセルアレイにおけるl番目の縦列を表す。図6の波形は、図4のピクセルアレイ1002を動作させるために、図4の表示システム1000に適用可能である。本ピクセルアレイは2以上の図2のピクセル回路20を備えると仮定する。
Claims (6)
- 少なくとも1つのピクセル回路を有するピクセルアレイの動作方法であって、前記ピクセル回路は、スイッチ、このスイッチに接続されたセレクトライン、駆動トランジスタ、発光デバイス、および記憶キャパシタを備え、前記駆動トランジスタは、第1端子、第2端子、およびゲート端子を有し、このゲート端子は前記スイッチを介してデータラインに接続され、かつ前記記憶キャパシタにも接続され、前記第1端子は電源ラインに接続され、前記第2端子は前記記憶キャパシタおよび前記発光デバイスに接続され、前記動作方法は下記工程を含む:
各フレーム周期において下記工程を含む、前記ピクセルアレイにおけるピクセル回路の各々のためフレーム周期を規定するオペレーションサイクルを反復する工程:
前記オペレーションサイクル中のプログラミングサイクルの間に、プログラミングのためのピクセルを選択するために第1状態から第2状態にセレクトラインを駆動するのに応答して該ピクセル回路をプログラミングするプログラミング工程であって、前記データライン上にプログラミングデータを提供する工程を含むプログラミング工程、
前記プログラミングに応答して、前記セレクトラインの前記第2状態から前記第1状態への駆動に応答して前記オペレーションサイクルの駆動サイクル中に該ピクセル回路を駆動する駆動工程であって、前記プログラミングデータに従って前記発光デバイスの発光を引き起し、前記ピクセル回路を駆動する駆動工程の間に前記電源ラインは正電圧を有する駆動工程、および
前記駆動に応答して、次のフレーム周期の前に、前記オペレーションサイクルの緩和サイクル中の前記駆動トランジスタへのストレス作用を固定の緩和時間τ R の間、緩和させる緩和工程であって、下記工程を含む:
前記緩和サイクルの第1の動作サイクル中に前記第1状態から第2状態に前記セレクトラインを駆動させた後、前記緩和サイクルの第2の動作サイクル中に前記第2状態から第1状態に前記セレクトラインを駆動させることにより、前記第1および第2の動作サイクルの間前記電源ラインを正電圧に保持しつつ、前記駆動トランジスタに前記駆動工程とは逆極性でバイアスをかける工程、および
前記第1の動作サイクル中に、前記データラインを、ストレスを受けていない状態での駆動トランジスタの閾値電圧とストレスを受けていない状態での前記発光デバイスのオン電圧との総和より小さい電圧に変化させる工程。 - 前記プログラミング工程が第1サイクルで前記駆動トランジスタのゲートソース間電圧を発生させる工程を含む請求項1に記載の方法。
- 前記プログラミング工程が、前記電源ラインを第1の電圧に充電するとともに、前記データラインを前記第1の電圧とは逆極性の第2の電圧に充電する工程を含む請求項1に記載の方法。
- 前記プログラミング工程が下記工程を含む請求項1に記載の方法:
第1サイクルで、前記電源ラインを、前記データラインの電圧とは逆極性の第1の電圧に充電する工程、
この第1サイクルの後の第2サイクルで、前記電源ラインの電圧を変化させて、前記駆動トランジスタのソース又はドレイン端子を、前記駆動トランジスタがターンオフする点まで充電する工程、および
この第2サイクルの後の第3サイクルでは、前記のデータライン上でプログラミングデータを提供する工程が、前記データラインを前記プログラミングデータに関連するプログラミング電圧まで充電する工程。 - 前記緩和工程が、前記緩和と同時に、前記ピクセルアレイ内の第2のピクセル回路を、前記データラインを、該第2のピクセル回路用の第2のプログラミングデータに関連する第2のプログラミング電圧まで充電することによりプログラミングする工程を含む請求項1に記載の方法。
- 前記緩和工程が下記工程を含む請求項1に記載の方法:
第1緩和サイクルで、該ピクセル回路を選択し、前記スイッチおよび前記記憶キャパシタと前記駆動トランジスタのゲート端子との接続点を所定電圧まで充電し、この所定電圧は、前記発光デバイスを備えた該ピクセル回路が第2の緩和サイクルで消光を生じるように選択され、その間に同時に、該第1のピクセルが位置する横列とは異なるピクセルアレイの横列に位置する第2のピクセルが、前記データライン上で該第2のピクセル用のプログラミングデータを提供することにより第2の緩和サイクル中にプログラミングされる工程。
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US20170193915A1 (en) | 2017-07-06 |
JP2009533717A (ja) | 2009-09-17 |
EP2008264A4 (en) | 2009-07-08 |
EP2008264A1 (en) | 2008-12-31 |
US20180068620A1 (en) | 2018-03-08 |
CN101501748A (zh) | 2009-08-05 |
US20140266994A1 (en) | 2014-09-18 |
US20200005715A1 (en) | 2020-01-02 |
US9633597B2 (en) | 2017-04-25 |
US20190051248A1 (en) | 2019-02-14 |
US10127860B2 (en) | 2018-11-13 |
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