JP3700272B2 - Electrophoretic recording material and electrophoretic display device - Google Patents

Electrophoretic recording material and electrophoretic display device Download PDF

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Publication number
JP3700272B2
JP3700272B2 JP20697796A JP20697796A JP3700272B2 JP 3700272 B2 JP3700272 B2 JP 3700272B2 JP 20697796 A JP20697796 A JP 20697796A JP 20697796 A JP20697796 A JP 20697796A JP 3700272 B2 JP3700272 B2 JP 3700272B2
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electrode
conductive
electrophoretic
electric field
image
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JPH1048673A (en
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大介 津田
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
Fujifilm Business Innovation Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、電気泳動現象を利用した電気泳動記録体および電気泳動表示装置に関し、特に、電気泳動記録体および駆動装置を互いに分離可能に構成した電気泳動記録体および電気泳動表示装置に関する。
【0002】
【従来の技術】
「電気泳動現象」は、一般に固体(電気泳動粒子)と液体(分散媒)の界面に発生する電気二重層を利用したものであって、粒子と分散媒のそれぞれの材料の組合せと、界面に発生する電荷を制御するために分散媒に添加される界面活性剤との作用によって、粒子の表面に電荷を形成し、その表面の電荷が電界によって受ける力を駆動力として粒子が所望の方向に所望の速度で泳動する現象である。
【0003】
このような電気泳動現象を利用した表示方式は、構成の簡便さ、表示色の選択範囲の広さ、高コントラスト、広視野角、低電圧駆動、低消費電力、および画像のメモリ性を同時に備えるため、CRTディスプレイやLCDでは達成困難な種々の機能が得られるという特長を持っている。例えば、変化の頻繁な画像を鮮明に表示でき、画像のメモリ性により、一切のエネルギを供給することなく静止画像を表示し続けることができる。
【0004】
従来の電気泳動表示装置は、駆動方式により、分散系に接する一対の電極から分散系に直接画像信号を印加する方式(直接印加方式)のもの(例えば、特開平6−148693号公報等)と、絶縁板と電極との間に分散系を配置し、絶縁板の外側の表面にイオン流照射手段によりイオン流を照射して絶縁板の外部から分散系に画像信号を間接的に印加する方式(間接印加方式)のもの(例えば、特開昭61−86780号公報,特開平6−202168号公報等)とに大別される。
【0005】
上記直接印加方式を採用した従来の電気泳動表示装置は、電極が分散系に接しているために最小の印加電圧で分解能の高い画像の生成が可能であり、さらにマトリックス状の二次元駆動が容易なために高速書込みに向いている。
【0006】
また、上記間接印加方式を採用した従来の電気泳動表示装置は、分散系を備える電気泳動記録体がイオン流照射手段と分離しているため、電気泳動記録体に電極群を備える必要がなく、電気泳動記録体は簡素かつ廉価となる。従って、複数の画面を同時に見たい場合には、同一のイオン流照射手段を用いながら電気泳動記録体だけを交換することによって複数の画面を次々に生成することを容易、かつ安価に行うことができるという特長がある。
【0007】
【発明が解決しようとする課題】
しかし、上記直接印加方式を採用した従来の電気泳動表示装置によると、マトリックス状の電極群と電気泳動記録体とが一体となっているため、一般的なディスプレイ、例えば、ねじれネマティック型液晶ディスプレイと大差がなく、例えば、複数の画面を同時に見たい場合は、表示可能な画素数の範囲内で複数の画面をそれぞれ部分的に表示するか、複数の表示装置を備える必要がある等の不便さがあった。これは、メモリ性の活用法として、画像の変化部分のみ書き替えて画面のチラツキを抑える、消費電力を抑える等の駆動上のメリットに使う他は書き込んだ画像をその状態で任意の時間保持することに限られ、この間は比較的高価な部分である駆動装置も停止せざるを得ない状況であった。
【0008】
また、上記間接印加方式を採用した従来の電気泳動表示装置によると、イオン流照射手段を構成するイオン源及びイオン流制御ブレードを高速書込みに必要なマトリックス状の二次元配置とすることが困難であるとともに、照射イオンの極性を瞬時に反転させることも容易ではなく、高速駆動には不向きである。また、分散系の駆動に対して絶縁板を介して信号が印加されるため、解像度の劣化を招き易いという問題もある。
【0009】
従って、本発明の目的は、分解能の高い画像を高速に形成でき、しかも構成が簡素かつ低価格で複数の静止画像を比較することのできる電気泳動記録体および電気泳動表示装置を提供することにある。
【0010】
【課題を解決するための手段】
本発明は、上記目的を達成するため、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成され、前記対向電極は、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極であることを特徴とする電気泳動記録体を提供する。
更に本発明は、上記目的を達成するため、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成され、前記導電異方性の電極は、透明樹脂に複数の導電性透明粒子を分散して構成された透明電極であり、前記透明樹脂と前記複数の導電性透明粒子との屈折率を略同等としたことを特徴とする電気泳動記録体を提供する。
記構成によれば、導電異方性の電極と対向電極との間に画像信号に応じた電界を印加すると、電気泳動粒子が持つ電荷の極性と印加した電界の極性とによって電気泳動粒子が分散媒を泳動し、導電異方性の電極あるいは対向電極に集まる。電気泳動粒子に分散媒と異なる色を用いることで、画像が可視表示される。記録体の対向電極を全面電極あるいは基板の機能をも備えた導電異方性の電極とすることにより、記録体の構成が簡素で低価格となり、複数の静止画像を生成する上でより簡素で低価格なものとなる。導電異方性および対向電極が分散系に接しているため、最小の印加電圧で分解能の高い画像の生成が可能となる。
【0011】
本発明は、上記目的を達成するため、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成された電気泳動記録体と、前記電気泳動記録体と着脱可能に一体化され、前記電気泳動記録体の装着時に前記導電異方性の電極に当接する駆動電極と、前記駆動電極を介して前記導電異方性の電極と前記対向電極との間に前記画像信号に応じた前記電界を印加する印加手段とを備えた駆動装置とを具備し、前記対向電極は、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極であり、前記駆動装置は、前記電気泳動記録体の装着時に前記対向電極に当接する他の駆動電極を備え、前記印加手段は、前記他の駆動電極を介して前記対向電極に前記電界を印加する構成を有してなることを特徴とする電気泳動表示装置を提供する。
更に本発明は、上記目的を達成するため、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成された電気泳動記録体と、前記電気泳動記録体と着脱可能に一体化され、前記電気泳動記録体の装着時に前記導電異方性の電極に当接する駆動電極と、前記駆動電極を介して前記導電異方性の電極と前記対向電極との間に前記画像信号に応じた前記電界を印加する印加手段とを備えた駆動装置とを具備し、前記導電異方性の電極は、透明樹脂に複数の導電性透明粒子を分散して構成された透明電極であり、前記透明樹脂と前記複数の導電性透明粒子との屈折率を略同等としたことを特徴とする電気泳動表示装置を提供する。
更に本発明は、上記目的を達成するため、樹脂部材に複数の導電性粒子が分散され、かつ、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成された電気泳動記録体と、前記電気泳動記録体と着脱可能に一体化され、前記電気泳動記録体の装着時に前記導電異方性の電極に当接する複数の駆動電極と、前記駆動電極を介して前記導電異方性の電極と前記対向電極との間に前記画像信号に応じた前記電界を印加する印加手段とを備えた駆動装置とを具備し、それぞれの前記駆動電極に対して、前記複数の導電性粒子が2以上ずつ当接するように構成されてなることを特徴とする電気泳動表示装置を提供する。
上記構成によれば、電気泳動記録体の導電異方性の電極が駆動装置の駆動電極に当接するように、電気泳動記録体を駆動装置に装着すると、導電異方性の電極と駆動電極とが導通状態となる。この状態で、印加手段が、駆動電極を介して導電異方性の電極と対向電極との間に画像信号に応じた電界を印加すると、電気泳動粒子が持つ電荷の極性と印加した電界の極性とによって電気泳動粒子が分散媒を泳動し、導電異方性の電極あるいは対向電極に集まる。
また、分散系に印加する電界を消去した後も画像を表示し続けることができるため、複数の静止画像を比較する場合は、同一の駆動装置を用いて電気泳動記録体だけを交換して複数の静止画像を次々と生成する。
電気泳動記録体を駆動装置から分離可能とすることにより、記録体を含む表示装置を複数用いなくても、1つの駆動装置と複数の記録体とからなる簡易かつ低価格な構成で、比較対象の複数の静止画像を生成することができる。
分散系に電界を印加する電極の組合せを面状電極とマトリックス状の電極群との組合せ、または複数の縦方向あるいは横方向の線状電極と複数の横方向あるいは縦方向の線状電極との組合せとすることにより、マトリックス状の二次元駆動を行うことができ、記録体に高速で画像を書き込むことが可能となる。
このように本発明は、従来の直接印加方式が持つ高分解能性,高速性、従来の間接印加方式が持つ記録体の簡便性,一覧性といった特長を両立させつつ、それぞれの欠点の解決を図ったものである。
【0012】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して詳細に説明する。
図1は本発明の第1の実施の形態に係る電気泳動記録体の構成を示す断面図である。
【0013】
この電気泳動記録体(以下「記録体」と略す。)1Aは、スペーサ10を介して保持された表示側基板11及び導電異方性の電極としての非表示側基板12と、表示側基板11の内側の面11aに形成された対向電極としての面状電極13と、両基板11,12間に封入された分散媒14及び複数の電気泳動粒子15からなる分散系16と、面状電極13に接続されたコネクタ17とを具備している。
【0014】
スペーサ10は、例えば、ポリエステルフィルム等からなり、基板11,12の端部及び適宜分散系16中に配置されている。
【0015】
表示側基板11は、例えば、透明なガラス,プラスチック等からなる。
【0016】
図2は非表示側基板12の要部正面図である。
非表示側基板12は、フィルム12aに図2に示すように複数の導電性粒子12bを分散させたものである。導電性粒子12bの存在する部分は、その導通効果によって基板12の厚さ方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性を備えている。また、非表示側基板12は、非表示側にあるので、フィルム12aには、各種の樹脂を用いることができ、導電性粒子12bには、ニッケル粒子、炭素粒子、表面を導電処理されたガラス,プラスチック等の各種の粒子を用いることができる。
【0017】
面状電極13は、イリジウム錫酸化物(ITO)等の光透過性導電性の薄膜から構成されている。
【0018】
分散媒14は、例えば、イソパラフィン系炭化水素,ヘキシルベンゼン,テトラフルオロジブロモエタン,パーフルオロポリエーテル,トルエントリフルオライド等の絶縁性有機溶媒に青色染料とイオン性界面活性剤を混合したものが用いられる。
【0019】
電気泳動粒子15は、透明ワックスに白色顔料(例えば、TiO2 )を分散させたものであり、例えば直径数μmのものが用いられる。
【0020】
図3は図1に示す記録体1Aが適用された本発明の第1の実施の形態に係る電気泳動表示装置の構成を示す断面図である。
この電気泳動表示装置(以下「表示装置」と略す。)100Aは、互いに分離可能に構成された図1に示す記録体1A、および記録体1Aを駆動して電気泳動現象に基づく表示を行う駆動装置2Aとから構成されている。
【0021】
駆動装置2Aは、非表示側基板20と、非表示側基板20の表面20aに形成され、記録体1Aの装着時に記録体1Aの非表示側基板12に当接する駆動電極としてのマトリックス状の電極群21と、アース接地された、記録体1Aのコネクタ17に接続されるコネクタ22と、電極群21と記録体1Aの面状電極13との間に直流電圧を印加する電源回路23とを具備している。
【0022】
電極群21は、絶縁領域21aを介してマトリックス状に形成され、薄膜トランジスタによって駆動されるようになっている。
【0023】
電源回路23は、入力される画像信号Sに応じて電極群21にリード23aを介して直流電圧(電界)を印加するようになっている。
【0024】
次に、本表示装置100Aの動作を図4及び図5を参照して説明する。
図4及び図5は本表示装置100Aによる記録体1Aの表示状態を示す断面図である。なお、電気泳動粒子15は、負に帯電し、図1に示すように分散媒14中に浮遊しているとする。
【0025】
オペレータは、図1に示す記録体1Aを図3に示すように駆動装置2Aに装着する。すなわち、記録体1Aの非表示側基板12を駆動装置2Aの電極群21に当接させ、記録体1Aのコネクタ17と駆動装置2のコネクタ22とを接続する。非表示側基板12を電極群21に当接することにより、非表示側基板12と電極群21とは、非表示側基板12が有する導電異方性によって導通状態となる。
【0026】
この状態で、電源回路23は、外部から画像信号Sが入力されると、その画像信号Sに応じて電極群21にリード23aを介して極性が正あるいは負の直流電圧(電界)を印加する。すると、図4に示すように、負の直流電圧が印加された電極群21と面状電極13との間に位置する電気泳動粒子15は、分散媒14を泳動して面状電極13に集まり、正の直流電圧が印加された電極群21と面状電極13との間に位置する電気泳動粒子15は、分散媒14を泳動して電極群21に集まる。
【0027】
表示側基板11の外側からは、面状電極13側に電気泳動粒子15が集まった領域(画素)で、電気泳動粒子15の色(この実施の形態では白色)が見え、電気泳動粒子15が集まっていない領域(画素)で、分散媒14の色(この実施の形態では青色)が見える。これにより、表示側基板11側に白色と青色の2色からなる画像が可視表示される。また、画像のメモリ性よりコネクタ17,22を外しても、図5に示すように、無電源で長時間表示側基板11側に静止画像を表示し続けることができるので、複数の静止画像を比較する場合は、同一の駆動装置2Aを用いて記録体1Aだけを交換して複数の静止画像を次々と生成する。
【0028】
上記構成の表示装置100Aによれば、記録体1Aに画像情報を書き込む際、電極群21が形成された駆動装置2Aの非表示側基板20に記録体1Aを接触配置させ、コネクタ17,22を接続するだけの操作により、画像信号に応じたパターン状の電界を記録体1Aに印加することができる。
また、分散系16に印加する電界を消去した後も画像を表示し続けることができるため、記録体1Aを駆動装置2Aから分離可能とすることにより、記録体を含む表示装置を複数用いなくても、1つの駆動装置2Aと複数の記録体1Aとからなる簡易かつ低価格な構成で、比較対象の複数の静止画像を生成することができる。
また、記録体1Aにマトリックス状の電極群や複数の縦方向あるいは横方向の線状電極を備えていないため、記録体1Aの構成が簡素で低価格となり、複数の静止画像を生成する上でより簡素で低価格なものとなる。
また、非表示側基板12および面状電極13が分散系16に接しているため、電極群21と接した導電性粒子12bによって記録電圧は電極群21の解像度を維持しつつ分散媒14との界面に直接伝達されるため、最小の印加電圧で分解能の高い画像の生成が可能となる。
また、分散系16に電界を印加する電極の組合せを面状電極13とマトリックス状の電極群21との組合せとしているので、マトリックス状の二次元駆動を行うことができ、記録体1Aに高速で画像を書き込むことが可能となる。
【0029】
図6は本発明の第2の実施の形態に係る電気泳動記録体の構成を示す断面図である。なお、図1に示す記録体1Aと同一の機能を有するものは、同一の符号を用いてその説明を省略する。
この記録体1Bは、スペーサ10を介して保持された対向電極としての表示側基板18及び導電異方性の電極としての非表示側基板12と、両基板18,12間に封入された分散媒14及び複数の電気泳動粒子15からなる分散系16とを具備している。
【0030】
表示側基板18は、非表示側基板12と同様にフィルム18aに複数の導電性粒子18bを分散させたものである。導電性粒子18bの存在する部分は、その導通効果によって基板18の厚さ方向に電気的に通じるという導電異方性を有している。また、表示側基板18は、表示側にあるので、フィルム18aには、透明の樹脂が用いられ、導電性粒子18bには、透明のガラス,プラスチック等の粒子の表面に酸化インジウム等の透明導電膜を形成したものが用いられる。この場合、透明のフィルム18aおよび透明の導電性粒子18bの屈折率は、画像のゆがみ防止のため略同等であることが好ましい。
【0031】
図7は図6に示す記録体1Bが適用された本発明の第2の実施の形態に係る電気泳動表示装置の構成を示す断面図である。図3に示す表示装置100Aと同一の機能を有するものは、同一の符号を用いてその説明を省略する。
この表示装置100Bは、互いに分離可能に構成された図6に示す記録体1B、および記録体1Bを駆動して電気泳動現象に基づく表示を行う駆動装置2Bとから構成されている。
【0032】
駆動装置2Bは、一対の表示側基板24および非表示側基板20と、一対の表示側基板24および非表示側基板20の対向する面24a,20aにそれぞれ形成され、記録体1Bの装着時に記録体1Bの表示側基板18および非表示側基板12に当接する駆動電極としての複数の縦方向線状電極25および複数の横方向線状電極26と、両電極25,26間に画像信号に応じて直流電圧を印加する電源回路27とを具備している。
【0033】
表示側の複数の縦方向線状電極25は、絶縁領域(図示省略)を介して形成され、イリジウム錫酸化物(ITO)等の光透過性導電性の薄膜からなり、薄膜トランジスタによって駆動されるようになっている。
【0034】
非表示側の複数の横方向線状電極26は、絶縁領域26aを介して形成され、薄膜トランジスタによって駆動されるようになっている。
【0035】
電源回路27は、入力される画像信号Sに応じて電極25,26にリード27a,27bを介して直流電圧(電界)を印加するようになっている。
【0036】
次に、本表示装置100Bの動作を図8及び図9を参照して説明する。
図8及び図9は本表示装置100Bによる記録体1Bの表示状態を示す断面図である。なお、電気泳動粒子15は負に帯電し、図6に示すように分散媒14中に浮遊しているとする。
【0037】
オペレータは、図6に示す記録体1Bを図7に示すように駆動装置2Bに装着する。すなわち、記録体1Bの表示側基板18および非表示側基板12を駆動装置2Bの複数の縦方向線状電極25および複数の横方向線状電極26にそれぞれ当接させる。これにより、表示側基板18と複数の縦方向線状電極25、非表示側基板12と複数の横方向線状電極26とは、表示側基板18および非表示側基板12が有する導電異方性によって導通状態となる。
【0038】
この状態で、電源回路27は、外部から画像信号Sが入力されると、その画像信号Sに応じて縦方向線状電極25および横方向線状電極26にリード27a,27bを介して極性が正あるいは負の直流電圧(電界)を印加する。すると、図8に示すように、縦方向線状電極25に正、横方向線状電極26に負の直流電圧が印加された電極25,26間に位置する電気泳動粒子15は、分散媒14を泳動して正の縦方向線状電極25に集まり、縦方向線状電極25に負、横方向線状電極26に正の直流電圧が印加された電極25,26間に位置する電気泳動粒子15は、分散媒14を泳動して正の横方向線状電極26に集まる。
【0039】
表示側基板18の外側からは、縦方向線状電極25に電気泳動粒子15が集まった領域(画素)で、電気泳動粒子15の色(この実施の形態では白色)が見え、電気泳動粒子15が集まっていない領域(画素)で、分散媒14の色(この実施の形態では青色)が見える。これにより、表示側基板18側に白色と青色の2色からなる画像が可視表示される。画像のメモリ性よりコネクタ17,22を外しても、図9に示すように、無電源で長時間表示側基板18側に静止画像を表示し続けることができるので、複数の静止画像を比較する場合は、同一の駆動装置2Bを用いて記録体1Bだけを交換して複数の静止画像を次々と生成する。
【0040】
上記構成の第2の実施の形態に係る表示装置100Bによれば、第1の実施の形態に係る表示装置100Aと同様の効果を奏する。
すなわち、画像信号に応じたパターン状の電界を記録体1Bに印加することができ、1つの駆動装置2Bと複数の記録体1Bとからなる簡易かつ低価格な構成で、比較対象の複数の静止画像を生成することができる。
また、記録体1Bにマトリックス状の電極群や複数の縦方向あるいは横方向の線状電極を備えていないため、記録体1Bの構成が簡素で低価格となり、複数の静止画像を生成する上でより簡素で低価格なものとなる。
また、非表示側基板12および表示側基板18が分散系16に接しているため、最小の印加電圧で分解能の高い画像の生成が可能となる。
また、分散系16に電界を印加する電極の組合せを複数の縦方向線状電極25と複数の横方向線状電極26との組合せとしているので、マトリックス状の二次元駆動を行うことができ、記録体1Bに高速で画像を書き込むことが可能となる。
また、非表示側基板12および表示側基板18を基板と電極の両機能を備えた導電異方性を有する部材から構成しているので、構成の簡素化をより図ることができる。
【0041】
図10は本発明の第3の実施の形態に係る電気泳動表示装置の外観を示す斜視図である。
この表示装置100Cは、第2の実施の形態に係る表示装置100Bの駆動装置2Bの基板20,24をヒンジ28により開閉可能に結合したものでり、電源回路27は、一方の基板(ここでは基板24)内部に設けている。
【0042】
なお、本発明は、上記実施の形態に限定されず、種々な実施の形態が可能である。
例えば、上記第1の実施の形態において、記録体1Aの非表示側基板12、駆動装置2Aの非表示側基板20側を透明とし、これらを表示側としてもよい。この場合、表示側基板11および面状電極13は透明でなくてもよいが、透明とすることにより、表裏両側で画像を表示することができる。
また、上記第1の実施の形態において、面状電極13を複数の縦方向あるいは横方向の線状電極とし、電極群21を複数の横方向あるいは縦方向の線状電極としてもよく、面状電極13をマトリックス状の電極群とし、電極群21を面状電極としてもよい。この場合、表示側に配置される電極を透明電極にする。
また、上記第2の実施の形態では、複数の縦方向線状電極25と複数の横方向線状電極26の組合せを面状電極とマトリックス状の電極群との組合せとしてもよい。この場合、表示側に配置される電極を透明電極にする。
【0043】
【発明の効果】
以上説明した通り、本発明によれば、電気泳動記録体を駆動装置から分離可能とすることにより、記録体を含む表示装置を複数用いなくても、1つの駆動装置と複数の記録体とからなる簡易かつ低価格な構成で、比較対象の複数の静止画像を生成することができる。同一あるいは異種の静止画像を表示した複数の記録体を得ることができるので、壁面上,ボード上等に並列配置することにより、プレゼンテーション,学会発表等の各種の表示にも使用することができる。
また、導電異方性および対向電極が分散系に接しているため、最小の印加電圧で分解能の高い画像の生成が可能となる。
また、分散系に電界を印加する電極の組合せを面状電極とマトリックス状の電極群との組合せ、または複数の縦方向あるいは横方向の線状電極と複数の横方向あるいは縦方向の線状電極との組合せとすることにより、マトリックス状の二次元駆動を行うことができ、記録体に高速で画像を書き込むことが可能となる。
【図面の簡単な説明】
【図1】本発明の第1の実施の形態に係る電気泳動記録体の構成を示す断面図
【図2】本発明に係る非表示側基板の要部正面図
【図3】本発明の第1の実施の形態に係る電気泳動表示装置の構成を示す断面図
【図4】第1の実施の形態に係る電気泳動記録体の表示状態を示す断面図
【図5】第1の実施の形態に係る電気泳動記録体の表示状態を示す断面図
【図6】本発明の第2の実施の形態に係る電気泳動記録体の構成を示す断面図
【図7】本発明の第2の実施の形態に係る電気泳動表示装置の構成を示す断面図
【図8】第2の実施の形態に係る電気泳動記録体の表示状態を示す断面図
【図9】第2の実施の形態に係る電気泳動記録体の表示状態を示す断面図
【図10】本発明の第3の実施の形態に係る電気泳動表示装置の外観を示す斜視図
【符号の説明】
1A,1B 電気泳動記録体
10 スペーサ
11,18 電気泳動記録体の表示側基板
11a 電気泳動記録体の表示側基板の内側の面
12 電気泳動記録体の非表示側基板
12a,18a フィルム
12b,18b 導電性粒子
13 面状電極
14 分散媒
15 電気泳動粒子
16 分散系
17,22 コネクタ
20 駆動装置の非表示側基板
20a 駆動装置の非表示側基板の表面
21 マトリックス状の電極群
21a 絶縁領域
23,27 電源回路
23a,27a,27b リード
24 駆動装置の表示側基板
24a 駆動装置の表示側基板の表面
25 縦方向線状電極
26 横方向線状電極
26a 絶縁領域
28 ヒンジ
100A,100B,100C 電気泳動表示装置
S 画像信号
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrophoretic recording body and an electrophoretic display device using an electrophoretic phenomenon, and more particularly to an electrophoretic recording body and an electrophoretic display device in which the electrophoretic recording body and a driving device are configured to be separable from each other.
[0002]
[Prior art]
“Electrophoretic phenomenon” is an electric double layer that is generally generated at the interface between a solid (electrophoretic particles) and a liquid (dispersion medium). A charge is formed on the surface of the particle by the action of a surfactant added to the dispersion medium in order to control the generated charge, and the particle is moved in the desired direction using the force received by the electric field on the surface as a driving force. This is a phenomenon of migrating at a desired speed.
[0003]
A display method using such an electrophoretic phenomenon simultaneously has a simple configuration, a wide display color selection range, a high contrast, a wide viewing angle, low voltage driving, low power consumption, and image memory performance. Therefore, it has a feature that various functions difficult to achieve with a CRT display or LCD can be obtained. For example, a frequently changing image can be clearly displayed, and the still image can be continuously displayed without supplying any energy due to the memory property of the image.
[0004]
A conventional electrophoretic display device has a method (direct application method) in which an image signal is directly applied to a dispersion system from a pair of electrodes in contact with the dispersion system (for example, JP-A-6-148893). A system in which a dispersion system is arranged between an insulating plate and an electrode, and an image signal is indirectly applied to the dispersion system from the outside of the insulating plate by irradiating the outer surface of the insulating plate with an ion flow by means of ion flow irradiation means. (Indirect application method) (for example, JP-A-61-86780, JP-A-6-202168, etc.).
[0005]
The conventional electrophoretic display device adopting the above-described direct application method can generate a high-resolution image with the minimum applied voltage because the electrodes are in contact with the dispersion system, and further facilitates matrix-like two-dimensional driving. Therefore, it is suitable for high-speed writing.
[0006]
Further, in the conventional electrophoretic display device adopting the indirect application method, since the electrophoretic recording body provided with the dispersion system is separated from the ion flow irradiation means, it is not necessary to provide the electrophoretic recording body with an electrode group. The electrophoretic recording medium is simple and inexpensive. Therefore, when it is desired to view a plurality of screens simultaneously, it is possible to easily and inexpensively generate a plurality of screens one after another by exchanging only the electrophoretic recording body while using the same ion flow irradiation means. There is a feature that you can.
[0007]
[Problems to be solved by the invention]
However, according to the conventional electrophoretic display device adopting the direct application method, since the matrix electrode group and the electrophoretic recording body are integrated, a general display, for example, a twisted nematic liquid crystal display and There is no big difference, for example, when you want to see multiple screens at the same time, it is inconvenient that you need to partially display multiple screens within the range of the number of pixels that can be displayed or provide multiple display devices, etc. was there. This is a memory utilization method that rewrites only the changed part of the image and suppresses flickering of the screen, and uses it for driving merit such as reducing power consumption. During this period, the drive device, which is a relatively expensive part, had to be stopped.
[0008]
In addition, according to the conventional electrophoretic display device employing the indirect application method, it is difficult to make the ion source and the ion flow control blade constituting the ion flow irradiation means into a matrix-like two-dimensional arrangement necessary for high-speed writing. At the same time, it is not easy to invert the polarity of the irradiated ions instantaneously and is not suitable for high-speed driving. In addition, since a signal is applied via the insulating plate to the drive of the dispersion system, there is a problem that resolution is easily deteriorated.
[0009]
Accordingly, an object of the present invention is to provide an electrophoretic recording material and an electrophoretic display device which can form an image with high resolution at high speed, and which can compare a plurality of still images with a simple configuration and at a low price. is there.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides a conductive anisotropic electrode having conductivity in the thickness direction and having no conductivity in the vertical width direction and the horizontal width direction. A counter electrode in which a predetermined space is formed between the conductive anisotropic electrodes by facing each other with an interval, and a dispersion in which a plurality of electrophoretic particles are dispersed in a dispersion medium enclosed in the space And displaying the image by an electric field according to the image signal applied between the conductive anisotropy and the counter electrode, and holding the image even after the electric field is erased. The electrode is a conductive anisotropic electrode having conductivity in the thickness direction and having no conductivity in the vertical width direction and the horizontal width direction.
  Furthermore, in order to achieve the above object, the present invention provides a conductive anisotropic electrode having conductivity in the thickness direction and not having conductivity in the vertical width direction and the horizontal width direction, and the conductive anisotropic electrode. A plurality of electrophoretic particles dispersed in a dispersion medium enclosed in the space and a counter electrode in which a predetermined space is formed between the electrode and the anisotropic conductive electrode A dispersion system, configured to display an image by an electric field according to an image signal applied between the conductive anisotropy and the counter electrode, and hold the image even after erasing the electric field, The conductive anisotropic electrode is a transparent electrode formed by dispersing a plurality of conductive transparent particles in a transparent resin, and the refractive indexes of the transparent resin and the plurality of conductive transparent particles are substantially equal. An electrophoretic recording material is provided.
  UpAccording to the above configuration, when an electric field corresponding to the image signal is applied between the conductive anisotropic electrode and the counter electrode, the electrophoretic particles are dispersed depending on the polarity of the charge possessed by the electrophoretic particles and the polarity of the applied electric field. The medium migrates and collects on the conductive anisotropic electrode or the counter electrode. By using a color different from that of the dispersion medium for the electrophoretic particles, an image is displayed visually. By making the opposite electrode of the recording body an electrode of conductive anisotropy that also functions as a full-surface electrode or a substrate, the structure of the recording body becomes simple and low cost, and it is simpler to generate multiple still images. The price will be low. Since the conductive anisotropy and the counter electrode are in contact with the dispersion system, an image with high resolution can be generated with a minimum applied voltage.
[0011]
  In order to achieve the above object, the present invention provides a conductive anisotropic electrode having conductivity in the thickness direction and having no conductivity in the vertical width direction and the horizontal width direction. A counter electrode in which a predetermined space is formed between the conductive anisotropic electrodes by facing each other with an interval, and a dispersion in which a plurality of electrophoretic particles are dispersed in a dispersion medium enclosed in the space An electrophoresis system configured to display an image by an electric field according to an image signal applied between the conductive anisotropy and the counter electrode, and to hold the image even after the electric field is erased A recording electrode, a drive electrode that is detachably integrated with the electrophoretic recording body, and abuts against the conductive anisotropy electrode when the electrophoretic recording body is mounted; and the conductive anisotropy via the drive electrode According to the image signal between the electrode and the counter electrode And a driving device and a means for applying a serial fieldThe counter electrode is a conductive anisotropic electrode having conductivity in the thickness direction and having no conductivity in the vertical width direction and the horizontal width direction, and the driving device is mounted when the electrophoretic recording body is mounted. The driving device includes another driving electrode that is in contact with the counter electrode, and the application unit has a configuration that applies the electric field to the counter electrode through the other driving electrode.An electrophoretic display device is provided.
  Furthermore, in order to achieve the above object, the present invention provides a conductive anisotropic electrode having conductivity in the thickness direction and not having conductivity in the vertical width direction and the horizontal width direction, and the conductive anisotropic electrode. A plurality of electrophoretic particles dispersed in a dispersion medium enclosed in the space and a counter electrode in which a predetermined space is formed between the electrode and the anisotropic conductive electrode An electrical system configured to display an image by an electric field according to an image signal applied between the conductive anisotropy and the counter electrode, and to hold the image even after the electric field is erased. An electrophoretic recording body, a drive electrode that is detachably integrated with the electrophoretic recording body, and abuts on the conductive anisotropic electrode when the electrophoretic recording body is mounted; and the conductive anisotropic through the drive electrode The image signal is applied between the conductive electrode and the counter electrode. And a driving device including an applying means for applying the electric field, and the conductive anisotropic electrode is a transparent electrode configured by dispersing a plurality of conductive transparent particles in a transparent resin, There is provided an electrophoretic display device characterized in that a refractive index of a transparent resin and the plurality of conductive transparent particles are substantially equal.
  Furthermore, in order to achieve the above object, the present invention provides a conductive anisotropic material in which a plurality of conductive particles are dispersed in a resin member, have conductivity in the thickness direction, and have no conductivity in the vertical width direction and the horizontal width direction. A counter electrode in which a predetermined space is formed between the conductive electrode and the conductive anisotropy electrode with a predetermined gap therebetween, and enclosed in the space And a dispersion system in which a plurality of electrophoretic particles are dispersed in a dispersion medium, and an image is displayed by an electric field according to an image signal applied between the conductive anisotropy and the counter electrode, and the electric field An electrophoretic recording body configured to hold the image even after erasure, and the electrophoretic recording body are detachably integrated, and abuts on the conductive anisotropic electrode when the electrophoretic recording body is mounted. A plurality of drive electrodes and the conductive through the drive electrodes; And a driving device including an applying unit that applies the electric field according to the image signal between the isotropic electrode and the counter electrode, and the plurality of conductive materials for each of the driving electrodes. Provided is an electrophoretic display device characterized in that particles are configured to contact each other two or more.
  According to the above configuration, when the electrophoretic recording body is mounted on the driving device such that the conductive anisotropic electrode of the electrophoretic recording body abuts on the driving electrode of the driving device, the conductive anisotropic electrode and the driving electrode Becomes conductive. In this state, when the applying means applies an electric field corresponding to the image signal between the electrode having conductive anisotropy and the counter electrode via the driving electrode, the polarity of the electric charge of the electrophoretic particles and the polarity of the applied electric field As a result, the electrophoretic particles migrate through the dispersion medium and collect on the conductive anisotropic electrode or the counter electrode.
  In addition, since the image can be continuously displayed even after the electric field applied to the dispersion system is erased, when comparing a plurality of still images, only the electrophoretic recording medium is replaced by using the same driving device. Are generated one after another.
  By making the electrophoretic recording body separable from the driving device, it is possible to compare with a simple and low-cost configuration consisting of one driving device and a plurality of recording bodies without using a plurality of display devices including the recording body. A plurality of still images can be generated.
  The combination of electrodes for applying an electric field to the dispersion system is a combination of a planar electrode and a matrix electrode group, or a plurality of longitudinal or lateral linear electrodes and a plurality of lateral or longitudinal linear electrodes. By using a combination, two-dimensional driving in a matrix can be performed, and an image can be written on the recording body at high speed.
  As described above, the present invention aims to solve the respective disadvantages while attaining both the high resolution and high speed of the conventional direct application method and the convenience and listability of the recording medium of the conventional indirect application method. It is a thing.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing the configuration of an electrophoretic recording material according to the first embodiment of the present invention.
[0013]
This electrophoretic recording body (hereinafter abbreviated as “recording body”) 1A includes a display side substrate 11 held via a spacer 10, a non-display side substrate 12 as a conductive anisotropic electrode, and a display side substrate 11. A planar electrode 13 as a counter electrode formed on the inner surface 11a of the substrate, a dispersion system 16 composed of a dispersion medium 14 and a plurality of electrophoretic particles 15 enclosed between the substrates 11 and 12, and a planar electrode 13 And a connector 17 connected to the.
[0014]
The spacer 10 is made of, for example, a polyester film, and is disposed in the end portions of the substrates 11 and 12 and in the dispersion system 16 as appropriate.
[0015]
The display side substrate 11 is made of, for example, transparent glass or plastic.
[0016]
FIG. 2 is a front view of the main part of the non-display side substrate 12.
The non-display side substrate 12 is obtained by dispersing a plurality of conductive particles 12b in a film 12a as shown in FIG. The portion where the conductive particles 12b exist has conductivity in the thickness direction of the substrate 12 due to its conduction effect, and has a conductive anisotropy that does not have conductivity in the vertical width direction and the horizontal width direction. Further, since the non-display side substrate 12 is on the non-display side, various resins can be used for the film 12a, and the conductive particles 12b are nickel particles, carbon particles, and glass whose surface is subjected to conductive treatment. Various kinds of particles such as plastic can be used.
[0017]
The planar electrode 13 is composed of a light-transmitting conductive thin film such as iridium tin oxide (ITO).
[0018]
As the dispersion medium 14, for example, a mixture of a blue dye and an ionic surfactant in an insulating organic solvent such as isoparaffinic hydrocarbon, hexylbenzene, tetrafluorodibromoethane, perfluoropolyether, toluene fluoride, etc. is used. .
[0019]
The electrophoretic particles 15 are made of transparent wax and white pigment (for example, TiO 2).2For example, those having a diameter of several μm are used.
[0020]
FIG. 3 is a cross-sectional view showing the configuration of the electrophoretic display device according to the first embodiment of the invention to which the recording body 1A shown in FIG. 1 is applied.
The electrophoretic display device (hereinafter abbreviated as “display device”) 100A is configured to be separable from each other and the recording body 1A shown in FIG. 1, and the drive for driving the recording body 1A to perform display based on the electrophoretic phenomenon. It is comprised from the apparatus 2A.
[0021]
The driving device 2A is formed on a non-display side substrate 20 and a surface 20a of the non-display side substrate 20, and is a matrix electrode as a drive electrode that comes into contact with the non-display side substrate 12 of the recording body 1A when the recording body 1A is mounted. A group 21, a grounded ground connector 22 connected to the connector 17 of the recording body 1A, and a power supply circuit 23 for applying a DC voltage between the electrode group 21 and the planar electrode 13 of the recording body 1A. are doing.
[0022]
The electrode group 21 is formed in a matrix through the insulating region 21a and is driven by a thin film transistor.
[0023]
The power supply circuit 23 applies a DC voltage (electric field) to the electrode group 21 via the lead 23a according to the input image signal S.
[0024]
Next, the operation of the display device 100A will be described with reference to FIGS.
4 and 5 are cross-sectional views showing a display state of the recording body 1A by the display device 100A. It is assumed that the electrophoretic particles 15 are negatively charged and float in the dispersion medium 14 as shown in FIG.
[0025]
The operator attaches the recording body 1A shown in FIG. 1 to the driving device 2A as shown in FIG. That is, the non-display side substrate 12 of the recording body 1A is brought into contact with the electrode group 21 of the driving device 2A, and the connector 17 of the recording body 1A and the connector 22 of the driving device 2 are connected. By bringing the non-display side substrate 12 into contact with the electrode group 21, the non-display side substrate 12 and the electrode group 21 become conductive due to the conductive anisotropy of the non-display side substrate 12.
[0026]
In this state, when the image signal S is input from the outside, the power supply circuit 23 applies a positive or negative DC voltage (electric field) to the electrode group 21 via the lead 23a according to the image signal S. . Then, as shown in FIG. 4, the electrophoretic particles 15 positioned between the electrode group 21 to which the negative DC voltage is applied and the planar electrode 13 migrate to the planar electrode 13 by migrating the dispersion medium 14. The electrophoretic particles 15 positioned between the electrode group 21 to which a positive DC voltage is applied and the planar electrode 13 migrate to the electrode group 21 by migrating the dispersion medium 14.
[0027]
From the outside of the display-side substrate 11, the color of the electrophoretic particles 15 (white in this embodiment) can be seen in the region (pixel) where the electrophoretic particles 15 gather on the planar electrode 13 side. The color of the dispersion medium 14 (blue in this embodiment) can be seen in the uncollected region (pixel). As a result, an image composed of two colors, white and blue, is visibly displayed on the display side substrate 11 side. Further, even if the connectors 17 and 22 are removed due to the memory property of the image, as shown in FIG. 5, a still image can be continuously displayed on the display side substrate 11 side for a long time without a power source. In the case of comparison, a plurality of still images are generated one after another by exchanging only the recording body 1A using the same drive device 2A.
[0028]
According to the display device 100A having the above configuration, when writing image information on the recording body 1A, the recording body 1A is placed in contact with the non-display-side substrate 20 of the driving device 2A on which the electrode group 21 is formed, and the connectors 17 and 22 are connected. A pattern-shaped electric field corresponding to an image signal can be applied to the recording body 1A by simply connecting.
Further, since the image can be continuously displayed even after the electric field applied to the dispersion system 16 is erased, the recording body 1A can be separated from the driving device 2A, so that a plurality of display devices including the recording body need not be used. In addition, it is possible to generate a plurality of still images to be compared with a simple and low-cost configuration including one driving device 2A and a plurality of recording bodies 1A.
In addition, since the recording body 1A is not provided with a matrix-like electrode group or a plurality of longitudinal or lateral linear electrodes, the configuration of the recording body 1A is simple and inexpensive, and a plurality of still images are generated. It will be simpler and cheaper.
Further, since the non-display side substrate 12 and the planar electrode 13 are in contact with the dispersion system 16, the recording voltage is maintained with the dispersion medium 14 while maintaining the resolution of the electrode group 21 by the conductive particles 12 b in contact with the electrode group 21. Since it is transmitted directly to the interface, it is possible to generate an image with high resolution with the minimum applied voltage.
Further, since the combination of the electrodes for applying an electric field to the dispersion system 16 is a combination of the planar electrode 13 and the matrix electrode group 21, matrix-like two-dimensional driving can be performed, and the recording medium 1A can be driven at high speed. An image can be written.
[0029]
FIG. 6 is a cross-sectional view showing the configuration of the electrophoretic recording material according to the second embodiment of the present invention. In addition, what has the same function as 1 A of recording bodies shown in FIG. 1 uses the same code | symbol, and omits the description.
The recording body 1B includes a display-side substrate 18 as a counter electrode held via a spacer 10, a non-display-side substrate 12 as a conductive anisotropic electrode, and a dispersion medium sealed between the substrates 18 and 12. 14 and a dispersion system 16 composed of a plurality of electrophoretic particles 15.
[0030]
Similar to the non-display-side substrate 12, the display-side substrate 18 is obtained by dispersing a plurality of conductive particles 18b in a film 18a. The portion where the conductive particles 18b are present has a conductive anisotropy that is electrically connected in the thickness direction of the substrate 18 due to its conduction effect. Further, since the display side substrate 18 is on the display side, a transparent resin is used for the film 18a, and a transparent conductive material such as indium oxide on the surface of particles such as transparent glass and plastic is used for the conductive particles 18b. What formed the film | membrane is used. In this case, it is preferable that the refractive indexes of the transparent film 18a and the transparent conductive particles 18b are substantially equal to prevent image distortion.
[0031]
FIG. 7 is a cross-sectional view showing the configuration of an electrophoretic display device according to a second embodiment of the present invention to which the recording body 1B shown in FIG. 6 is applied. Components having the same functions as those of the display device 100A illustrated in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.
The display device 100B includes a recording body 1B shown in FIG. 6 configured to be separable from each other, and a driving device 2B that drives the recording body 1B to perform display based on an electrophoretic phenomenon.
[0032]
The driving device 2B is formed on each of the pair of display-side substrate 24 and non-display-side substrate 20 and the opposing surfaces 24a and 20a of the pair of display-side substrate 24 and non-display-side substrate 20, and performs recording when the recording body 1B is mounted. A plurality of vertical linear electrodes 25 and a plurality of horizontal linear electrodes 26 serving as drive electrodes in contact with the display side substrate 18 and the non-display side substrate 12 of the body 1B, and an image signal between the electrodes 25 and 26. And a power supply circuit 27 for applying a DC voltage.
[0033]
The plurality of vertical linear electrodes 25 on the display side are formed through an insulating region (not shown), are made of a light-transmitting conductive thin film such as iridium tin oxide (ITO), and are driven by a thin film transistor. It has become.
[0034]
The plurality of horizontal linear electrodes 26 on the non-display side are formed through insulating regions 26a and are driven by thin film transistors.
[0035]
The power supply circuit 27 applies a DC voltage (electric field) to the electrodes 25 and 26 via the leads 27a and 27b in accordance with the input image signal S.
[0036]
Next, the operation of the display device 100B will be described with reference to FIGS.
8 and 9 are sectional views showing the display state of the recording body 1B by the display device 100B. It is assumed that the electrophoretic particles 15 are negatively charged and are suspended in the dispersion medium 14 as shown in FIG.
[0037]
The operator attaches the recording body 1B shown in FIG. 6 to the driving device 2B as shown in FIG. That is, the display-side substrate 18 and the non-display-side substrate 12 of the recording body 1B are brought into contact with the plurality of vertical linear electrodes 25 and the plurality of horizontal linear electrodes 26 of the driving device 2B, respectively. Thereby, the display side substrate 18 and the plurality of vertical linear electrodes 25, and the non-display side substrate 12 and the plurality of horizontal linear electrodes 26 have the conductive anisotropy of the display side substrate 18 and the non-display side substrate 12. Is brought into conduction.
[0038]
In this state, when the image signal S is input from the outside, the power supply circuit 27 has a polarity to the vertical linear electrode 25 and the horizontal linear electrode 26 via the leads 27a and 27b in accordance with the image signal S. A positive or negative DC voltage (electric field) is applied. Then, as shown in FIG. 8, the electrophoretic particles 15 positioned between the electrodes 25, 26 to which a positive DC voltage is applied to the vertical linear electrode 25 and a negative DC voltage to the horizontal linear electrode 26 are dispersed in the dispersion medium 14. Electrophoretic particles located between the electrodes 25 and 26 to which positive DC voltage is applied to the vertical linear electrode 25 and to the horizontal linear electrode 26. 15, the dispersion medium 14 migrates and collects on the positive lateral linear electrode 26.
[0039]
From the outside of the display-side substrate 18, the color of the electrophoretic particles 15 (white in this embodiment) can be seen in the region (pixel) where the electrophoretic particles 15 gathered on the longitudinal linear electrodes 25. The color of the dispersion medium 14 (blue in this embodiment) can be seen in a region (pixel) where no particles are collected. Thereby, an image composed of two colors of white and blue is visually displayed on the display-side substrate 18 side. Even if the connectors 17 and 22 are removed due to the memory characteristics of the image, as shown in FIG. 9, it is possible to continue displaying a still image on the display-side substrate 18 side for a long time without a power source, so a plurality of still images are compared. In this case, only the recording body 1B is exchanged using the same drive device 2B, and a plurality of still images are generated one after another.
[0040]
According to the display device 100B according to the second embodiment having the above configuration, the same effects as those of the display device 100A according to the first embodiment can be obtained.
That is, a pattern-shaped electric field corresponding to an image signal can be applied to the recording body 1B, and a plurality of stationary objects to be compared can be compared with a simple and low-cost configuration including one driving device 2B and a plurality of recording bodies 1B. An image can be generated.
Further, since the recording body 1B is not provided with a matrix-like electrode group or a plurality of longitudinal or lateral linear electrodes, the structure of the recording body 1B is simple and low in cost, and generates a plurality of still images. It will be simpler and cheaper.
Further, since the non-display side substrate 12 and the display side substrate 18 are in contact with the dispersion system 16, an image with high resolution can be generated with the minimum applied voltage.
In addition, since the combination of electrodes for applying an electric field to the dispersion system 16 is a combination of a plurality of vertical linear electrodes 25 and a plurality of horizontal linear electrodes 26, matrix-like two-dimensional driving can be performed, An image can be written on the recording body 1B at high speed.
In addition, since the non-display side substrate 12 and the display side substrate 18 are made of a member having conductive anisotropy having both functions of a substrate and an electrode, the configuration can be further simplified.
[0041]
FIG. 10 is a perspective view showing an appearance of an electrophoretic display device according to the third embodiment of the invention.
This display device 100C is obtained by connecting the substrates 20 and 24 of the driving device 2B of the display device 100B according to the second embodiment so as to be opened and closed by a hinge 28, and the power supply circuit 27 is connected to one substrate (here, It is provided inside the substrate 24).
[0042]
In addition, this invention is not limited to the said embodiment, Various embodiment is possible.
For example, in the first embodiment, the non-display side substrate 12 of the recording body 1A and the non-display side substrate 20 side of the driving device 2A may be transparent, and these may be used as the display side. In this case, the display-side substrate 11 and the planar electrode 13 do not have to be transparent, but by making them transparent, images can be displayed on both the front and back sides.
In the first embodiment, the planar electrode 13 may be a plurality of longitudinal or lateral linear electrodes, and the electrode group 21 may be a plurality of lateral or longitudinal linear electrodes. The electrode 13 may be a matrix electrode group, and the electrode group 21 may be a planar electrode. In this case, the electrode arranged on the display side is a transparent electrode.
In the second embodiment, a combination of a plurality of vertical linear electrodes 25 and a plurality of horizontal linear electrodes 26 may be a combination of a planar electrode and a matrix electrode group. In this case, the electrode arranged on the display side is a transparent electrode.
[0043]
【The invention's effect】
As described above, according to the present invention, the electrophoretic recording body can be separated from the driving device, so that a single driving device and a plurality of recording bodies can be used without using a plurality of display devices including the recording body. A plurality of still images to be compared can be generated with a simple and low-cost configuration. Since a plurality of recording bodies displaying the same or different still images can be obtained, they can be used for various displays such as presentations and conference presentations by arranging them in parallel on a wall surface or on a board.
In addition, since the conductive anisotropy and the counter electrode are in contact with the dispersion system, it is possible to generate an image with high resolution with the minimum applied voltage.
Further, the combination of electrodes for applying an electric field to the dispersion system is a combination of a planar electrode and a matrix electrode group, or a plurality of longitudinal or lateral linear electrodes and a plurality of lateral or longitudinal linear electrodes. In combination, the two-dimensional drive in the form of a matrix can be performed, and an image can be written on the recording medium at a high speed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of an electrophoretic recording material according to a first embodiment of the invention.
FIG. 2 is a front view of an essential part of a non-display side substrate according to the present invention.
FIG. 3 is a cross-sectional view showing the configuration of the electrophoretic display device according to the first embodiment of the invention.
FIG. 4 is a cross-sectional view showing a display state of the electrophoretic recording material according to the first embodiment.
FIG. 5 is a cross-sectional view showing a display state of the electrophoretic recording material according to the first embodiment.
FIG. 6 is a cross-sectional view showing the configuration of an electrophoretic recording material according to a second embodiment of the invention.
FIG. 7 is a cross-sectional view showing a configuration of an electrophoretic display device according to a second embodiment of the invention.
FIG. 8 is a cross-sectional view showing a display state of an electrophoretic recording material according to a second embodiment.
FIG. 9 is a cross-sectional view showing a display state of an electrophoretic recording material according to a second embodiment.
FIG. 10 is a perspective view showing an appearance of an electrophoretic display device according to a third embodiment of the invention.
[Explanation of symbols]
1A, 1B electrophoretic recording material
10 Spacer
11, 18 Display substrate of electrophoretic recording material
11a Inside surface of display side substrate of electrophoretic recording medium
12 Non-display side substrate of electrophoretic recording material
12a, 18a film
12b, 18b conductive particles
13 Planar electrode
14 Dispersion medium
15 Electrophoretic particles
16 Dispersion system
17,22 Connector
20 Non-display side substrate of driving device
20a Surface of non-display side substrate of driving device
21 Matrix electrode group
21a Insulation region
23, 27 Power circuit
23a, 27a, 27b Lead
24 Display-side substrate of drive unit
24a Surface of display-side substrate of driving device
25 Longitudinal linear electrode
26 Horizontal linear electrodes
26a Insulation region
28 Hinge
100A, 100B, 100C electrophoretic display device
S Image signal

Claims (7)

厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、 前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成され、
前記対向電極は、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極であることを特徴とする電気泳動記録体。
The conductive anisotropy electrode having conductivity in the thickness direction and not having conductivity in the vertical width direction and the horizontal width direction is opposed to the conductive anisotropy electrode with a predetermined interval. A counter electrode having a predetermined space formed between it and an anisotropic electrode; and a dispersion system enclosed in the space and having a plurality of electrophoretic particles dispersed in a dispersion medium. An image is displayed by an electric field according to an image signal applied between the counter electrodes, and the image is held even after the electric field is erased.
The electrophoretic recording material, wherein the counter electrode is a conductive anisotropic electrode having conductivity in a thickness direction and having no conductivity in a longitudinal width direction and a lateral width direction.
厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成され、
前記導電異方性の電極は、透明樹脂に複数の導電性透明粒子を分散して構成された透明電極であり、前記透明樹脂と前記複数の導電性透明粒子との屈折率を略同等としたことを特徴とする電気泳動記録体。
The conductive anisotropy electrode having conductivity in the thickness direction and not having conductivity in the vertical width direction and the horizontal width direction is opposed to the conductive anisotropy electrode with a predetermined interval. A counter electrode having a predetermined space formed between it and an anisotropic electrode; and a dispersion system enclosed in the space and having a plurality of electrophoretic particles dispersed in a dispersion medium. An image is displayed by an electric field according to an image signal applied between the counter electrodes, and the image is held even after the electric field is erased.
The conductive anisotropic electrode is a transparent electrode formed by dispersing a plurality of conductive transparent particles in a transparent resin, and the refractive index of the transparent resin and the plurality of conductive transparent particles is substantially equal. An electrophoretic recording material.
厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、 前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成された電気泳動記録体と、
前記電気泳動記録体と着脱可能に一体化され、前記電気泳動記録体の装着時に前記導電異方性の電極に当接する駆動電極と、前記駆動電極を介して前記導電異方性の電極と前記対向電極との間に前記画像信号に応じた前記電界を印加する印加手段とを備えた駆動装置とを具備し、
前記対向電極は、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極であり、
前記駆動装置は、前記電気泳動記録体の装着時に前記対向電極に当接する他の駆動電極を備え、
前記印加手段は、前記他の駆動電極を介して前記対向電極に前記電界を印加する構成を有してなることを特徴とする電気泳動表示装置。
The conductive anisotropy electrode having conductivity in the thickness direction and not having conductivity in the vertical width direction and the horizontal width direction is opposed to the conductive anisotropy electrode with a predetermined interval. A counter electrode having a predetermined space formed between it and an anisotropic electrode; and a dispersion system enclosed in the space and having a plurality of electrophoretic particles dispersed in a dispersion medium. An electrophoretic recording body configured to display an image by an electric field according to an image signal applied between the counter electrodes, and to hold the image even after erasing the electric field;
A drive electrode that is detachably integrated with the electrophoretic recording body and abuts against the conductive anisotropic electrode when the electrophoretic recording body is mounted, the conductive anisotropic electrode via the drive electrode, and the A driving device including an application unit that applies the electric field according to the image signal between the counter electrode and the counter electrode;
The counter electrode is a conductive anisotropic electrode that has conductivity in the thickness direction and does not have conductivity in the vertical width direction and the horizontal width direction,
The drive device includes another drive electrode that contacts the counter electrode when the electrophoretic recording body is mounted,
2. The electrophoretic display device according to claim 1, wherein the applying means is configured to apply the electric field to the counter electrode via the other drive electrode.
前記駆動電極および前記他の駆動電極は、面状電極とマトリックス状の電極群との組合せ、または複数の縦方向あるいは横方向の線状電極と複数の横方向あるいは縦方向の線状電極との組合せから構成された請求項記載の電気泳動表示装置。The drive electrode and the other drive electrode are a combination of a planar electrode and a matrix electrode group, or a plurality of longitudinal or lateral linear electrodes and a plurality of lateral or longitudinal linear electrodes. 4. The electrophoretic display device according to claim 3 , wherein the electrophoretic display device is composed of a combination. 前記導電異方性の電極と駆動電極、および前記対向電極と他の駆動電極は、少なくとも一方が透明電極である請求項記載の電気泳動表示装置。The electrophoretic display device according to claim 3 , wherein at least one of the conductive anisotropic electrode and the drive electrode, and the counter electrode and the other drive electrode is a transparent electrode. 厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、 前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成された電気泳動記録体と、
前記電気泳動記録体と着脱可能に一体化され、前記電気泳動記録体の装着時に前記導電異方性の電極に当接する駆動電極と、前記駆動電極を介して前記導電異方性の電極と前記対向電極との間に前記画像信号に応じた前記電界を印加する印加手段とを備えた駆動装置とを具備し、
前記導電異方性の電極は、透明樹脂に複数の導電性透明粒子を分散して構成された透明電極であり、前記透明樹脂と前記複数の導電性透明粒子との屈折率を略同等としたことを特徴とする電気泳動表示装置。
The conductive anisotropy electrode having conductivity in the thickness direction and not having conductivity in the vertical width direction and the horizontal width direction is opposed to the conductive anisotropy electrode with a predetermined interval. A counter electrode having a predetermined space formed between it and an anisotropic electrode; and a dispersion system enclosed in the space and having a plurality of electrophoretic particles dispersed in a dispersion medium. An electrophoretic recording body configured to display an image by an electric field according to an image signal applied between the counter electrodes, and to hold the image even after erasing the electric field;
A drive electrode that is detachably integrated with the electrophoretic recording body and abuts against the conductive anisotropic electrode when the electrophoretic recording body is mounted, the conductive anisotropic electrode via the drive electrode, and the A driving device including an application unit that applies the electric field according to the image signal between the counter electrode and the counter electrode;
The conductive anisotropic electrode is a transparent electrode formed by dispersing a plurality of conductive transparent particles in a transparent resin, and the refractive index of the transparent resin and the plurality of conductive transparent particles is substantially equal. An electrophoretic display device.
樹脂部材に複数の導電性粒子が分散され、かつ、厚み方向に導電性を有し、縦幅方向および横幅方向に導電性を有しない導電異方性の電極と、前記導電異方性の電極に所定の間隔を有して対向することにより前記導電異方性の電極との間に所定の空間を形成した対向電極と、前記空間内に封入され、分散媒に複数の電気泳動粒子を分散させた分散系とを備え、前記導電異方性および対向電極間に印加された画像信号に応じた電界によって画像を表示し、かつ、前記電界の消去後も前記画像を保持するように構成された電気泳動記録体と、
前記電気泳動記録体と着脱可能に一体化され、前記電気泳動記録体の装着時に前記導電異方性の電極に当接する複数の駆動電極と、前記駆動電極を介して前記導電異方性の電極と前記対向電極との間に前記画像信号に応じた前記電界を印加する印加手段とを備えた駆動装置とを具備し、
それぞれの前記駆動電極に対して、前記複数の導電性粒子が2以上ずつ当接するように構成されてなることを特徴とする電気泳動表示装置。
A conductive anisotropic electrode in which a plurality of conductive particles are dispersed in a resin member and conductive in the thickness direction and not conductive in the vertical width direction and the horizontal width direction, and the conductive anisotropic electrode A counter electrode having a predetermined space between the electrode and the anisotropic electrode, and a plurality of electrophoretic particles dispersed in a dispersion medium enclosed in the space. A dispersion system configured to display an image by an electric field according to an image signal applied between the conductive anisotropy and the counter electrode, and hold the image even after the electric field is erased. An electrophoretic recording medium,
A plurality of drive electrodes which are detachably integrated with the electrophoretic recording body and abut against the conductive anisotropic electrodes when the electrophoretic recording body is mounted; and the conductive anisotropic electrodes via the drive electrodes And a driving device including an application unit that applies the electric field according to the image signal between the counter electrode and the counter electrode,
An electrophoretic display device, wherein each of the plurality of conductive particles is in contact with each of the drive electrodes by two or more.
JP20697796A 1996-08-06 1996-08-06 Electrophoretic recording material and electrophoretic display device Expired - Lifetime JP3700272B2 (en)

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