JP4790623B2 - 電気光学ディスプレイおよびドライブ方法 - Google Patents
電気光学ディスプレイおよびドライブ方法 Download PDFInfo
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- JP4790623B2 JP4790623B2 JP2006541488A JP2006541488A JP4790623B2 JP 4790623 B2 JP4790623 B2 JP 4790623B2 JP 2006541488 A JP2006541488 A JP 2006541488A JP 2006541488 A JP2006541488 A JP 2006541488A JP 4790623 B2 JP4790623 B2 JP 4790623B2
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Description
L*=116(R/R0)1/3−16、
ここでRは反射率、R0は標準の反射率の値)、または特定のガンマを提供するように選定され得、2.2のガンマがしばしばモニタに対して適用され、本ディスプレイがモニタの代用として使用される場合には、同じガンマの使用が望ましい。)ピクセルをレベル0から1に変化する(今後便宜上、「0−1遷移」として参照される)ために必要なインパルスは、1−2または2−3遷移に必要とされるそれとしばしば同一ではないことが発見されている。さらに、1−0遷移に必要なインパルスは、必ずしも0−1遷移の反転と同じではない。追加として、一部のシステムは「メモリ」効果を示すことが知られ、すなわち、(例えば)0−1遷移に必要なインパルスは、特定のピクセルが0−0−1、1−0−1または3−0−1遷移の何れを経由するかに依存してある程度変化する(ここでx、y、およびzはすべて時間経過と共に訪れる光学的状態の順番を示す光学的状態0、1、2、および3であり、「x−y−z」の記号は早いものから遅いものへのリストである。)。これらの問題は、必要とされるピクセルを他の状態にドライブする前に、かなりの時間のあいだ全てのピクセルを極限状態の1つにドライブすることによって、低減されまたは克服されるものの、結果として生じる無地の「フラッシュ」はしばしば許容し難いものである。例えば、電子本(electric book)の読者がその本のテキストをスクリーンでスクロールダウンすることを希望するとき、ディスプレイが短い間隔で黒または白の無地にフラッシュする必要がある場合には、読者は注意をそらされ、またはその場所がわからなくなることがあり得る。さらにディスプレイがこのようにフラッシュすることはそのエネルギ消費を増加し、ディスプレイの使用寿命を減少し得る。最終的に、少なくとも一部の場合には、特定の遷移に対して必要とされるインパルスは温度およびディスプレイの合計動作時間によって、および特定のピクセルが所与の遷移の前に特定の光学的状態に保たれた時間によって影響されること、および正確なグレースケールを演出するためにはこれらの要素に対して補償することが望ましいこと、が明らかにされている。したがって、電気光学ディスプレイにおいて良好なイメージの演出を生成するためには、適切に定義されたインパルスを電気光学媒体に印加するための制御方法が必要とされる。
ここでPはディスプレイを走査する間に消費される電力を、Cはスイッチされる全ての列電極の結合された電気容量を、Vは列ドライバの全「スイング電圧」(すなわち、全電圧動作範囲)を、およびfは列電極において見られる波形の有効な周波数である。
列電極に少なくとも第1、第2および第3の電圧を印加でき、第1および第2の電圧は相互に異なり、第3の電圧は第1および第2の電圧の間にある、列ドライバと、
いつ、列が列電極に印加される電圧を第1の電圧から第2の電圧に変化する必要があるかを決定し、このような変化の必要性が検出されるとき、列電極にまたはからチャージが流れるための十分な時間の間、列ドライバをして列電極に最初に第3の電圧を印加させ、その後、列ドライバをして列電極に第2の電圧を印加させるように配置される、ロジック手段と、を備える。
初期および最終の表示されるイメージを表すデータを受け取るための入力手段と、
入力手段によって受け取られるデータを初期および最終のイメージのピクセルワイズ(pixel−wise)表現に変換(tranalate)するための変換手段と、
初期および最終のイメージのピクセルワイズ表現を蓄えるための貯蔵手段と、
ディスプレイのピクセル電極に印加される電圧を制御するために配置される複数の出力手段と、
貯蔵手段からデータを受け取り、このデータから複数の出力手段において要求される出力を生成するために配置されるロジック手段と、を備える。
既に述べたとおり、本発明は、電気光学媒体、電気光学媒体に電界を印加することができるピクセル電極、およびピクセル電極と関連する列電極を有する電気光学ディスプレイをドライブするための、2ステップ電圧変化法(TSVCM)の方法を提供する。TSVCMは2ステップのプロセスで列電極上の電圧を変化することを含み、第1のステップにおいては、電圧は第1の値から、第1(初期の)および第2(最終の)の値の間の第3の値に、チャージが列電極へまたはそこから流れることを許容する充分な時間の間、変更される。その後、第2のステップにおいては、列電極上の電圧は、第3の電圧から第2の電圧に変更される。また既に指摘されたとおり、TSVCMはディスプレイによって消費される電力を低減することを意図される。
Q1=20nF*30V
Q1=600nC
正方向に向かう遷移は1つ置きの行(例えば、白から黒への反転に対して)、または60マイクロ秒毎に生じる。そのために、1秒の間に、+15Vサプライは600nCのチャージを1秒/60マイクロ秒回だけ提供し、それは10mAの電流の引き出しを生じる。80%のブースターサプライ効率が与えられているので、これは3.0V入力において62.5mAの平均電流、または187.5mWの電力引き出しに相当する。
図3A〜図3Dは、本発明の2ステップ電圧変化法を実行するための、図2A〜図2Dと同様の装置の使用を表す。このTSVCMは、図2A〜図2Dの従来技術プロセスとは異なる。すなわち、ドライバ108のOE入力は、列電極電圧の遷移の間、列電極110を0Vに最初にディスチャージするために使用される。列電極を所望の最終値にチャージするためにブースターサプライ104および106の1つを使用する以前に、ブースターサプライ104および106を使用することはない。
Q2=CV
Q2=20nF*15V
Q2=300nC
であることは、発明のTSVCMにおいては電圧が従来技術方法におけるそれの半分であるという事実からわかるとおりである。かくして、
Q1=2Q2
すなわち、本方法においては、電力サプライは図2A〜図2Dの従来技術方法の半分のチャージを提供し、本方法は従来技術方法において使用される半分の電圧で、列電極に電力を効果的に提供する。従来技術方法においては、常時ハイのOEにより、2Q1クーロンのチャージが1つのフル(黒−白−黒)サイクル(2行)の間に供給された。本発明の方法においては、4Q2クーロンが列電極に流入しまたから流出するが、しかし、2Q2クーロンのみが電力サプライから要求された。かくして、従来技術方法の半分の電流がサプライによって提供され、その結果として、入力における合計電気容量電力は187.5mWとなった。
(柔軟性のある(flexible)大面積ディスプレイ)
すでに述べたとおり、その第2の主要な局面において、この発明は柔軟性のある基板を備える電気光学ディスプレイシステム、および柔軟性のある基板に取り付けられる複数の柔軟性のある電気光学ディスプレイユニットを、このような電気光学ディスプレイシステムを生成するためのプロセスと共に提供し、該プロセスは柔軟性のある基板を提供することと、複数の柔軟性のある電気光学ディスプレイユニットを提供し、柔軟性のある基板に複数の柔軟性のある電気光学ディスプレイユニットを貼り付けることと、を包含する。
すでに述べたとおり、本発明の第3の主要な局面は、それと共に関連するピクセル電極をそれぞれ有する複数のピクセルを備える、ディスプレイモジュールの上に表示されるイメージを制御するためのディスプレイモジュールドライバデバイスを提供する。ドライバデバイスは、表示される初期および最後のイメージを表すデータを受信するための入力手段と、入力手段によって受信されたデータを初期および最後のイメージのピクセルワイズ表現に変換するための変換手段と、初期および最後のイメージのピクセルワイズ表現を蓄えるための貯蔵手段と、ディスプレイのピクセル電極に印加される電圧を制御するために配置される複数の出力手段と、貯蔵手段からデータを受信し、このデータから複数の出力手段に必要な出力を生成するために配置されるロジック手段と、を備える。発明のこの第3の主要な局面はまた、複数のディスプレイモジュールおよびディスプレイアセンブリ入力手段を備えるディスプレイアセンブリを提供し、それぞれのディスプレイモジュールはそれと共に関連しその関連するディスプレイモジュール上に表示されるイメージを制御するために配置される発明のディスプレイモジュールドライバデバイスを有し、ディスプレイアセンブリ入力手段はディスプレイアセンブリ上に表示されるイメージを表すイメージデータを受信し、少なくともイメージデータの部分をそれぞれのディスプレイモジュールドライバデバイスに提供するために配置される。
Claims (15)
- 電気光学媒体を有する電気光学ディスプレイをドライブする方法であって、
該電気光学媒体は、粒子ベースの電気泳動媒体であり、該粒子ベースの電気泳動媒体は、懸濁流体と、該懸濁流体内に保持され該懸濁流体に対する電界の印加によって該懸濁流体内で運動することが可能な複数の電気的にチャージされた粒子とを含み、
該ディスプレイは、
該電気光学媒体に電界を印加することが可能な複数のピクセル電極と、
該ピクセル電極に関連付けられた複数の列電極であって、各ピクセル電極は、1つの列電極に接続されている、複数の列電極と
をさらに含み、
該方法は、
該列電極上の電圧を第1の電圧から該第1の電圧とは異なる第2の電圧に変化させ、これにより、該電気光学媒体の光学的状態の変化を生じさせることを該関連付けられたピクセル電極に行わせること
を含み、
該方法は、
該列電極上の該電圧は、最初に、該列電極にチャージが流入または流出することを許容するのに充分な時間の間に、該第1の電圧から該第1の電圧および第2の電圧の中間の第3の電圧に変化させられ、その後、該列電極上の該電圧は、該第3の電圧から該第2の電圧に変化させられることと、
該ディスプレイ上のイメージが書き換えられる場合に、該書き換えるプロセスの1つのステップの間の各列電極上の初期電圧は、該書き換えるプロセスの後続のステップの間の該列電極上の最終電極と比較され、該初期電圧および該最終電圧が異なる列電極のみに、該第3の電圧が印加されることと
を特徴とする、方法。 - 前記第1の電圧および第2の電圧は逆の極性を有し、前記第3の電圧はグラウンド電圧である、請求項1に記載の方法。
- 前記第3の電圧は前記第1の電圧および第2の電圧の算術平均値と実質的に等しい、請求項1に記載の方法。
- 前記ディスプレイは、前記電気光学媒体の前記ピクセル電極とは反対の側に配置されるフロント電極をさらに含み、該フロント電極は実質的に一定の電圧に保持され、前記第3の電圧は該フロント電極の該電圧と実質的に等しい、請求項1に記載の方法。
- 前記ディスプレイは、
前記列電極に接続され、該列電極に前記第1の電圧、第2の電圧、第3の電圧を印加するように配置される列ドライバと、
該列ドライバに少なくとも2つの電圧を供給するように配置される電圧供給手段と
をさらに含み、
共通電極上の前記電圧が前記第3の値にセットされる場合に、該列電極に流入または流出するチャージが該電圧供給手段を通過しない、請求項1に記載の方法。 - 前記ディスプレイは、前記列電極に接続される列ドライバをさらに含み、該列ドライバは、オン状態およびオフ状態を有するOE入力を有し、
該OE入力がそのオン状態にある場合に、該列ドライバは前記第1の電圧、第2の電圧、第3の電圧を前記列電極に印加することが可能であるが、該OE入力がそのオフ状態にある場合に、該列ドライバは前記第3の電圧のみを前記列電極に印加することが可能であり、
前記方法は、
最初に、該OE入力を該オフ状態にセットし、これにより、前記列電極に前記第3の電圧を印加させることを該列ドライバに行わせることと、
その後、該OE入力をそのオン状態にセットし、これにより、前記列電極に前記第2の電圧を印加させることを該列ドライバに行わせることと
によって達成される、請求項1に記載の方法。 - 前記電気光学ディスプレイは、
前記電気光学媒体の一方の側のピクセル電極の二次元アレイと、
前記電気光学媒体の反対の側の共通電極と、
ピクセル電極の該二次元アレイの列に接続された複数の列電極と、
ピクセル電極の該二次元アレイの行に接続された複数の行電極と
を有するアクティブマトリックスディスプレイであり、
各ピクセル電極は1つの特定の列電極および1つの特定の行電極の交差によって一義的に定義される、請求項1に記載の方法。 - 前記電気泳動媒体は、前記懸濁流体および前記電気的にチャージされた粒子を複数の離散したドロップレットに分離する連続した相を有する、カプセル化された媒体である、請求項1に記載の方法。
- 電気光学媒体を有する電気光学ディスプレイをドライブする装置であって、
該電気光学媒体は、粒子ベースの電気泳動媒体であり、該粒子ベースの電気泳動媒体は、懸濁流体と、該懸濁流体内に保持され該懸濁流体に対する電界の印加によって該懸濁流体内で運動することが可能な複数の電気的にチャージされた粒子とを含み、
該ディスプレイは、
該電気光学媒体に電界を印加することが可能な複数のピクセル電極と、
該ピクセル電極に関連付けられた複数の列電極であって、各ピクセル電極は、1つの列電極に接続されている、複数の列電極と
をさらに含み、
該装置は、
少なくとも第1の電圧、第2の電圧、第3の電圧を各列電極に印加することが可能な列ドライバであって、該第1の電圧および第2の電圧は相互に異なり、該第3の電圧は該第1の電圧および第2の電圧の中間にある、列ドライバ
を含み、
該装置は、
該列ドライバが選択された列電極に印加される該電圧を該第1の電圧から該第2の電圧に変化させることをいつ必要とするかを決定し、
このような変化の必要性が検出される場合に、最初に、該選択された列電極にチャージが流入また流出することを許容するのに充分な時間の間に、該選択された列電極に該第3の電圧を印加させることを該列ドライバに行わせ、その後、該選択された列電極に該第2の電圧を印加させることを該列ドライバに行わせるように配置される、ロジック手段
を特徴とする、装置。 - 前記第1の電圧および第2の電圧は逆の極性を有し、前記第3の電圧はグラウンド電圧である、請求項9に記載の装置。
- 前記第3の電圧は前記第1の電圧および第2の電圧の算術平均値と実質的に等しい、請求項9に記載の装置。
- 前記列ドライバに少なくとも2つの電圧を供給するように配置される電圧供給手段をさらに含み、
前記ロジック手段は、共通電極上の前記電圧が前記第3の値にセットされる場合に、前記列電極に流入または流出するチャージを迂回させることを該列ドライバに行わせ、その結果、このチャージが該電圧供給手段を通過しないように配置される、請求項9に記載の装置。 - 前記列ドライバはオン状態およびオフ状態を有するOE入力を有し、該OE入力がそのオン状態にある場合に、該列ドライバは前記第1の電圧、第2の電圧、第3の電圧を前記列電極に印加することが可能であるが、該OE入力がそのオフ状態にある場合に、該列ドライバは、前記第3の電圧のみを前記列電極に印加することが可能であり、
前記ロジック手段は、
最初に、該OE入力を該オフ状態にセットし、これにより、前記列電極に前記第3の電圧を印加させることを該列ドライバに行わせ、
その後、該OE入力をそのオン状態にセットし、これにより、前記列電極に前記第2の電圧を印加させることを該列ドライバに行わせるように配置される、請求項9に記載の装置。 - 電気光学媒体の層を含む電気光学ディスプレイであって、
該電気光学媒体は、粒子ベースの電気泳動媒体であり、該粒子ベースの電気泳動媒体は、懸濁流体と、該懸濁流体内に保持され該懸濁流体に対する電界の印加によって該懸濁流体内で運動することが可能な複数の電気的にチャージされた粒子とを含み、
該ディスプレイは、
該電気光学媒体と隣接して配置される複数のピクセル電極と、
該電気光学媒体と隣接してその反対の側に配置されるフロント電極と、
該ピクセル電極に関連付けられた複数の列電極であって、各ピクセル電極は、1つの列電極に接続されている、複数の列電極と
をさらに含み、
該ディスプレイは、
請求項9に記載の装置を含むことと、
該装置の列ドライバは該列電極およびフロント電極に印加される前記電圧を制御するように配置されることと
を特徴とする、電気光学ディスプレイ。 - 前記電気泳動媒体は、前記懸濁流体および前記電気的にチャージされた粒子を複数の離散したドロップレットに分離する連続した相を有する、カプセル化された媒体である、請求項14に記載の電気光学ディスプレイ。
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-
2004
- 2004-11-24 US US10/904,718 patent/US8928562B2/en active Active
- 2004-11-26 CN CN2011101041452A patent/CN102176306A/zh active Pending
- 2004-11-26 JP JP2006541488A patent/JP4790623B2/ja active Active
- 2004-11-26 CN CN201210177593.XA patent/CN102842289B/zh active Active
- 2004-11-26 EP EP04812395A patent/EP1687660A4/en not_active Withdrawn
- 2004-11-26 WO PCT/US2004/039863 patent/WO2005052653A2/en not_active Application Discontinuation
- 2004-11-26 CN CN2004800348902A patent/CN101120393B/zh active Active
-
2008
- 2008-06-11 HK HK08106444.1A patent/HK1116286A1/xx unknown
-
2011
- 2011-03-14 JP JP2011055904A patent/JP2011118437A/ja not_active Withdrawn
-
2013
- 2013-06-21 HK HK13107285.4A patent/HK1180099A1/zh unknown
-
2014
- 2014-12-24 US US14/582,306 patent/US9542895B2/en active Active
- 2014-12-29 JP JP2014266979A patent/JP2015062084A/ja not_active Withdrawn
-
2016
- 2016-08-12 JP JP2016158454A patent/JP6362646B2/ja active Active
- 2016-11-23 US US15/359,923 patent/US20170075186A1/en not_active Abandoned
-
2017
- 2017-08-28 JP JP2017163246A patent/JP2017204012A/ja not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CN102842289B (zh) | 2016-01-20 |
JP2017204012A (ja) | 2017-11-16 |
CN101120393A (zh) | 2008-02-06 |
US9542895B2 (en) | 2017-01-10 |
US20050122284A1 (en) | 2005-06-09 |
EP1687660A4 (en) | 2009-04-22 |
CN101120393B (zh) | 2011-06-15 |
WO2005052653A3 (en) | 2006-12-21 |
HK1180099A1 (zh) | 2013-10-11 |
US20150109283A1 (en) | 2015-04-23 |
JP2016191961A (ja) | 2016-11-10 |
US8928562B2 (en) | 2015-01-06 |
CN102842289A (zh) | 2012-12-26 |
HK1116286A1 (en) | 2008-12-19 |
JP6362646B2 (ja) | 2018-07-25 |
CN102176306A (zh) | 2011-09-07 |
JP2015062084A (ja) | 2015-04-02 |
EP1687660A2 (en) | 2006-08-09 |
JP2011118437A (ja) | 2011-06-16 |
JP2007529027A (ja) | 2007-10-18 |
WO2005052653A2 (en) | 2005-06-09 |
US20170075186A1 (en) | 2017-03-16 |
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