JP2023541843A - 高速かつ高コントラストな光学状態切替を提供する4粒子電気泳動媒体 - Google Patents
高速かつ高コントラストな光学状態切替を提供する4粒子電気泳動媒体 Download PDFInfo
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
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- Microelectronics & Electronic Packaging (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
本願は、2020年9月15日に出願された、米国仮特許出願第63/078,829号、および2021年5月20日に出願された、米国仮特許出願第63/191,075号の優先権を主張する。本明細書に開示される、全ての特許および公開は、参照することによって、全体として組み込まれる。
電気泳動ディスプレイ(EPD)は、光透過性視認表面に対する荷電着色粒子の位置を修正することによって、色を変更する。そのような電気泳動ディスプレイは、結果として生じるディスプレイが、紙上のインクとほぼ同様に、高コントラストを有し、太陽光可読であるため、典型的には、「電子ペーパー」または「eペーパー」と称される。電気泳動ディスプレイは、電気泳動ディスプレイが、書籍同様の読書体験を提供し、少ない消費電力を使用し、ユーザが、軽量な手持ちデバイス内に数百冊の書籍のライブラリを携行することを可能にするため、AMAZON KINDLE(登録商標)等、電子書籍読取機において幅広い採用を享受している。
(a)電気泳動粒子、流体、および流体添加物(例えば、米国特許第7,002,728号および第7,679,814号参照)
(b)カプセル、結合剤、およびカプセル化プロセス(例えば、米国特許第6,922,276号および第7,411,719号参照)
(c)マイクロセル構造、壁材料、およびマイクロセルを形成する方法(例えば、米国特許第7,072,095号および第9,279,906号参照)
(d)マイクロセルを充填およびシールするための方法(例えば、米国特許第7,144,942号および第7,715,088号参照)
(e)電気光学材料を含有するフィルムおよびサブアセンブリ(例えば、米国特許第6,982,178号および第7,839,564号参照)
(f)バックプレーン、接着剤層、および他の補助層、ならびにディスプレイにおいて使用される方法(例えば、米国特許第7,116,318号および第7,535,624号参照)
(g)色形成および色調節(例えば、米国特許第6,017,584号、第6,545,797号、第6,664,944号、第6,788,452号、第6,864,875号、第6,914,714号、第6,972,893号、第7,038,656号、第7,038,670号、第7,046,228号、第7,052,571号、第7,075,502***号、第7,167,155号、第7,385,751号、第7,492,505号、第7,667,684号、第7,684,108号、第7,791,789号、第7,800,813号、第7,821,702号、第7,839,564***号、第7,910,175号、第7,952,790号、第7,956,841号、第7,982,941号、第8,040,594号、第8,054,526号、第8,098,418号、第8,159,636号、第8,213,076号、第8,363,299号、第8,422,116号、第8,441,714号、第8,441,716号、第8,466,852号、第8,503,063号、第8,576,470号、第8,576,475号、第8,593,721号、第8,605,354号、第8,649,084号、第8,670,174号、第8,704,756号、第8,717,664号、第8,786,935号、第8,797,634号、第8,810,899号、第8,830,559号、第8,873,129号、第8,902,153号、第8,902,491号、第8,917,439号、第8,964,282号、第9,013,783号、第9,116,412号、第9,146,439号、第9,164,207号、第9,170,467号、第9,170,468号、第9,182,646号、第9,195,111号、第9,199,441号、第9,268,191号、第9,285,649号、第9,293,511号、第9,341,916号、第9,360,733号、第9,361,836号、第9,383,623号、および第9,423,666号、ならびに米国特許出願公開第2008/0043318号、第2008/0048970号、第2009/0225398号、第2010/0156780号、第2011/0043543号、第2012/0326957号、第2013/0242378号、第2013/0278995号、第2014/0055840号、第2014/0078576号、第2014/0340430号、第2014/0340736号、第2014/0362213号、第2015/0103394号、第2015/0118390号、第2015/0124345号、第2015/0198858号、第2015/0234250号、第2015/0268531号、第2015/0301246号、第2016/0011484号、第2016/0026062号、第2016/0048054号、第2016/0116816号、第2016/0116818号、および第2016/0140909号参照)
(h)ディスプレイを駆動するための方法(例えば、米国特許第5,930,026号、第6,445,489号、第6,504,524号、第6,512,354号、第6,531,997号、第6,753,999号、第6,825,970号、第6,900,851号、第6,995,550号、第7,012,600号、第7,023,420号、第7,034,783号、第7,061,166号、第7,061,662号、第7,116,466号、第7,119,772号、第7,177,066号、第7,193,625号、第7,202,847号、第7,242,514号、第7,259,744号、第7,304,787号、第7,312,794号、第7,327,511号、第7,408,699号、第7,453,445号、第7,492,339号、第7,528,822号、第7,545,358号、第7,583,251号、第7,602,374号、第7,612,760号、第7,679,599号、第7,679,813号、第7,683,606号、第7,688,297号、第7,729,039号、第7,733,311号、第7,733,335号、第7,787,169号、第7,859,742号、第7,952,557号、第7,956,841号、第7,982,479号、第7,999,787号、第8,077,141号、第8,125,501号、第8,139,050号、第8,174,490号、第8,243,013号、第8,274,472号、第8,289,250号、第8,300,006号、第8,305,341号、第8,314,784号、第8,373,649号、第8,384,658号、第8,456,414号、第8,462,102号、第8,514,168号、第8,537,105号、第8,558,783号、第8,558,785号、第8,558,786号、第8,558,855号、第8,576,164号、第8,576,259号、第8,593,396号、第8,605,032号、第8,643,595号、第8,665,206号、第8,681,191号、第8,730,153号、第8,810,525号、第8,928,562号、第8,928,641号、第8,976,444号、第9,013,394号、第9,019,197号、第9,019,198号、第9,019,318号、第9,082,352号、第9,171,508号、第9,218,773号、第9,224,338号、第9,224,342号、第9,224,344号、第9,230,492号、第9,251,736号、第9,262,973号、第9,269,311号、第9,299,294号、第9,373,289号、第9,390,066号、第9,390,661号、および第9,412,314号、ならびに米国特許出願公開第2003/0102858号、第2004/0246562号、第2005/0253777号、第2007/0091418号、第2007/0103427号、第2007/0176912号、第2008/0024429号、第2008/0024482号、第2008/0136774号、第2008/0291129号、第2008/0303780号、第2009/0174651号、第2009/0195568号、第2009/0322721号、第2010/0194733号、第2010/0194789号、第2010/0220121号、第2010/0265561号、第2010/0283804号、第2011/0063314号、第2011/0175875号、第2011/0193840号、第2011/0193841号、第2011/0199671号、第2011/0221740号、第2012/0001957号、第2012/0098740号、第2013/0063333号、第2013/0194250号、第2013/0249782号、第2013/0321278号、第2014/0009817号、第2014/0085355号、第2014/0204012号、第2014/0218277号、第2014/0240210号、第2014/0240373号、第2014/0253425号、第2014/0292830号、第2014/0293398号、第2014/0333685号、第2014/0340734号、第2015/0070744号、第2015/0097877号、第2015/0109283号、第2015/0213749号、第2015/0213765号、第2015/0221257号、第2015/0262255号、第2015/0262551号、第2016/0071465号、第2016/0078820号、第2016/0093253号、第2016/0140910号、および第2016/0180777号参照)(これらの特許および出願は、以降、MEDEOD(電気光学ディスプレイを駆動するための方法)出願と称され得る)
(i)ディスプレイの用途(例えば、米国特許第7,312,784号および第8,009,348号参照)
(j)非電気泳動ディスプレイ(例えば、米国特許第6,241,921号、ならびに米国特許出願公開第2015/0277160号、ならびに米国特許出願公開第2015/0005720号および2016/0012710号参照)
本明細書に開示されるのは、4つの粒子を含む、改良された電気泳動ディスプレイシステムである。先行技術が、それぞれの電荷極性の2つの粒子を伴う、4組の粒子を説明しているが、本発明は、1つの電荷極性(典型的には、負荷電)の単一のタイプの粒子、および反対電荷極性(典型的には、正荷電)の3つのタイプの粒子を利用する。本配列は、第1の電荷極性の単一の粒子の高速かつ混じり気のない光学状態(典型的には、白色)を確実にする。加えて、反対電荷極性の粒子が、好適な補色を伴って選定されるとき、高品質プロセス黒色が、生産されることができ、これは、白色テキスト上の黒色の高速なページめくり更新を可能にする。
本発明は、改良された4粒子電気泳動媒体を含み、第1の極性の第1の粒子と、反対極性を有する、3つの他の粒子とを含むが、異なる電荷の大きさを有する。典型的には、そのようなシステムは、負の白色粒子と、減法原色を有する、黄色、マゼンタ色、およびシアン色の正荷電粒子とを含む。加えて、いくつかの粒子は、その電気泳動移動度が、印加される電場の強度に対して、非線形であるように工学され得る。故に、1つ以上の粒子は、正しい極性の(例えば、20Vまたはそれよりも大きい)高電場の印加に伴って、電気泳動移動度の減少を被るであろう。そのような4粒子システムが、図1に図式的に示されており、これは、あらゆるピクセルにおいて、白色、黄色、赤色、マゼンタ色、青色、シアン色、緑色、および黒色を提供することができる。
(実施例1-印加電圧の関数として、色密度の変化率を測定する)
本発明の利益が、実験的に確認されている。特に、図4の構造に類似する、2つのディスプレイが調製され、一方のディスプレイのマイクロセルは、白色、シアン色、マゼンタ色、および黄色粒子を含む、配合で充填され、(低印加電圧で測定されるような)ゼータ電位は、それぞれ、-35mV、+70mV、+54mV、および-22mVであった。第2のディスプレイは、白色、シアン色、マゼンタ色、および黄色粒子を含む、配合で充填された、マイクロセルを有し、(低印加電圧で測定されるような)ゼータ電位は、それぞれ、-35mV、+70mV、-54mV、および+24mVであった。(負および正の両方の黄色の配合に対して働く)図5のパルスシーケンスを使用しながら、分光光度計を含む、電気光学測定ベンチを使用して、密度の変化率が、評価された。D. Hertel,「Optical measurement standards for reflective e-paper to predict colors displayed in ambient illumination environments,」 Color Research & Application, 43, 6, (907-921) (2018年)を参照されたい。
8つの原色状態を超える、複数の光学状態が、より長い、かつより複雑な波形を用いて、ディスプレイを駆動し、分光光度電気光学検査ベンチを使用して、L*a*b*値を測定することによって、実施例1の第2のディスプレイに対して測定された。測定値は、図8に示されるように、数万の色域が、優秀な黒色白色コントラスト比を伴うことを示唆する。
Claims (11)
- 非極性流体を備える、電気泳動媒体であって、
第1の光学特性および第1の電荷極性を有する、第1のタイプの粒子と、
第2の光学特性を有し、第1の電荷の大きさを伴う、第2の電荷極性を有する、第2のタイプの粒子であって、前記第2の粒子は、前記粒子に共有結合される、ポリマーの表面コーティングを有する、第2のタイプの粒子と、
第3の光学特性を有し、前記第1の電荷の大きさより小さい第2の電荷の大きさを伴う、前記第2の電荷極性を有する、第3のタイプの粒子と、
第4の光学特性を有し、前記第1の電荷の大きさより大きい第3の電荷の大きさを伴う、前記第2の電荷極性を有する、第4のタイプの粒子と
を含み、
前記第3のタイプの粒子および前記第4のタイプの粒子は両方とも、前記粒子に複合されるポリマーの層を含む、電気泳動媒体。 - 非極性流体を備える、電気泳動媒体であって、
第1の光学特性および第1の電荷極性を有する、第1のタイプの粒子と、
第2の光学特性を有し、第1の電荷の大きさを伴う、第2の電荷極性を有する、第2のタイプの粒子であって、前記第2の粒子は、ポリマーの表面コーティングを有しない、第2のタイプの粒子と、
第3の光学特性を有し、前記第1の電荷の大きさより小さい第2の電荷の大きさを伴う、前記第2の電荷極性を有する、第3のタイプの粒子と、
第4の光学特性を有し、前記第1の電荷の大きさより大きい第3の電荷の大きさを伴う、前記第2の電荷極性を有する、第4のタイプの粒子と
を含み、
前記第3のタイプの粒子および前記第4のタイプの粒子は両方とも、前記粒子に複合されるポリマーの層を含む、電気泳動媒体。 - 非極性流体を備える、電気泳動媒体であって、
第1の光学特性および第1の電荷極性を有する、第1のタイプの粒子と、
第2の光学特性を有し、第1の電荷の大きさを伴う、第2の電荷極性を有する、第2のタイプの粒子であって、前記第2の粒子は、前記電気泳動媒体内の第2の粒子のグラム毎に、前記第2の粒子の上へ吸着される、200mgを上回る電荷制御剤(CCA)を有する、第2のタイプの粒子と、
第3の光学特性を有し、前記第1の電荷の大きさより小さい第2の電荷の大きさを伴う、前記第2の電荷極性を有する、第3のタイプの粒子と、
第4の光学特性を有し、前記第1の電荷の大きさより大きい第3の電荷の大きさを伴う、前記第2の電荷極性を有する、第4のタイプの粒子と
を含み、
前記第3のタイプの粒子および前記第4のタイプの粒子は、それぞれ、前記電気泳動媒体内の第3および第4の粒子の個別のグラム毎に、前記第3および第4の粒子の上へ吸着される、50mg未満の電荷制御剤(CCA)を有する、電気泳動媒体。 - 前記電荷制御剤は、第4級アミン頭部基および脂肪酸テールを含む、請求項3に記載の電気泳動媒体。
- 前記電気泳動媒体が、10~50μm分離される、2つの電極の間に配置されるとき、前記第1のタイプの粒子は、10Vが、前記電極の間に印加されるときよりも、20Vが、前記2つの電極の間に印加されるときに、低い電気泳動移動度を有する、請求項1-4のいずれかに記載の電気泳動媒体。
- 前記第1の粒子は、光散乱粒子であり、前記第2、第3、および第4の粒子は、光吸収粒子である、請求項1-5のいずれかに記載の電気泳動媒体。
- 前記第1の粒子は、白色であり、前記第2、第3、および第4の粒子は、シアン色、マゼンタ色、および黄色から選択される、請求項1-6のいずれかに記載の電気泳動媒体。
- 黄色、マゼンタ色、およびシアン色顔料は、前記個別の粒子が、溶液を作製するために1.55未満の屈折率を有する、非極性流体中に、体積比15%(体積粒子対体積溶液)で略等方的に分布されるとき、それぞれ、650、550、および450nmにおいて、拡散反射率を呈し、前記溶液は、黒色背景を覆って、約1μmの厚さの層内に配置される、請求項7に記載の電気泳動媒体。
- 前記第1の電荷極性は、負であり、前記第2の電荷極性は、正である、請求項1-8のいずれかに記載の電気泳動媒体。
- カラー電気泳動ディスプレイであって、
視認表面における、光透過性電極と、
ピクセル電極に結合される、薄膜トランジスタのアレイを含む、バックプレーンと、
前記光透過性電極と前記バックプレーンとの間に配置される、請求項1-9のいずれかに記載の電気泳動媒体と
を備える、カラー電気泳動ディスプレイ。 - 請求項10に記載のカラー電気泳動ディスプレイを備える、電子ブック読取機、可搬型コンピュータ、タブレットコンピュータ、携帯電話、スマートカード、看板、腕時計、棚標識、またはフラッシュドライブ。
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