JP2004206049A - 光干渉型カラーディスプレイ - Google Patents
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Abstract
【解決手段】透明基板、内側前方光拡散層、複数の第一電極、パターン化支持層、複数の光学的フィルム、および複数の第二電極を有する光干渉型カラーディスプレイが提供される。内側前方光拡散層は透明基板上にあり、かつ第一電極は内側前方光拡散層上にある。パターン化支持層は、第一電極間で内側前方光拡散層上にある。光学的フィルムは第一電極上にあり、かつ第二電極はそれぞれの第一電極の上方に配置される。第二電極は、パターン化支持層によって支持される。その上、第二電極とそれぞれの第一電極との間にエア・ギャップが存在する。
【選択図】 図2
Description
【発明の属する技術分野】
本発明は、光干渉型カラーディスプレイに関する。より詳細には、本発明は改良型カラーシフトおよびコントラスト比(CR)を持つ光干渉型カラーディスプレイに関する。
【0002】
【従来の技術】
今日、液晶ディスプレイ(LCD)、有機発光デバイス(OLED)またはプラズマディスプレイパネル(PDP)のような軽量かつ薄型の平面パネルディスプレイが、日常生活において広く利用されてきている。特に液晶ディスプレイは、主流ディスプレイの一つになってきている。しかしながら、殆どのLCDは依然として欠点が多く、例えば狭い視角、中間的応答時間、フルカラー化のためのカラーフィルターの必要性、および光源の不十分な光学的利用の原因となる偏光子の必要性、バックライトモジュールによるエネルギーの浪費等が挙げられる。
【0003】
LCDの動作効率を改善するために、光干渉型ディスプレイと呼ばれる新型のLCDが開発された。この光干渉型パネルは、光干渉型変調器の配列を有する。各光干渉型変調器は、透明電極、反射電極およびその反射電極を支持する支持層を有する。支持層の支持によって反射電極と透明電極との間に特定の厚みのエアー・ギャップが形成される。光干渉型変調器の透明電極から入射した光はこのエアー・ギャップを通過し、第二電極に衝突する。第二電極に衝突した光は後方に反射され、透明電極を通して変調器から出射する。異なる厚みのエアー・ギャップを通過する光は光学的干渉程度が異なるので、異なる色が作り出される。例えば赤色光、緑色光および青色光はこの方法で作り出すことができる。更に光干渉型変調器内部の反射電極の設計は、パネル上の点を照明しまたは暗くするために光干渉型変調器が「オン」状態と「オフ」状態間で切り替わることができるように、微小電気機械式システム(MEMS)を組込まなければならない。
【0004】
光干渉型ディスプレイ内部の前記光干渉型変調器は、適切なカラー点を作り出すために追加の着色フィルターすなわち偏光子を必要とせず、従って生産コストを幾分節約することができる。更に各光干渉型変調器は極く僅かの電力しか消費せず、電気信号への応答が素早く、その結果双安定状態で動作する。従って光干渉型ディスプレイは携帯電話、携帯情報端末(PDA)、電子ブック(e−book)等のような殆どの携帯用デバイスを含む低消費電力製品に適する。
【0005】
図1は、従来の光干渉型カラーディスプレイ構造の略式断面図である。図1に示されるように、光干渉型カラーディスプレイ100は主に、透明基板110、パターン化支持層120、複数の第一電極130、複数の光学的フィルム140および複数の第二電極150を有する。一般に透明基板110はガラス基板か、または透明材料から作られる基板である。パターン化支持層120は、第二電極150の端部を支持するように透明基板110上に配置される。第一電極130もまた、透明基板110上に配置される。第一電極130は、インジウム錫酸化物(ITO)を含む材料を使用して作られる透明電極である。光学的フィルム140は、第一電極130上に配置される。典型的に、光学的フィルム140は交互に配置された多数の高誘電率フィルムと低誘電率フィルムを持つ複合スタックである。第二電極150は、第一電極130の上方に配置される。パターン化支持層120の支持によって、第二電極150は第一電極130の上方に配置される。第二電極150は、典型的に高反射金属材料を使用して作られる。
【0006】
一般に従来の光干渉型カラーパネルは、それぞれ異なるエアー・ギャップ厚を持つ複数の光干渉型変調器を有する。図1に示されるように、第二電極150と第一電極130との間のエアー・ギャップは、異なる光干渉型変調器について相違する。カラー光を作るために、光干渉型変調器は三つの異なるエアー・ギャップ間隔d1、d2およびd3を持つように設計される。d1のエアー・ギャップ間隔を備える光干渉型変調器は赤色光を射出し、d2のエアー・ギャップ間隔を備える光干渉型変調器は青色光を射出し、およびd3のエアー・ギャップ間隔を備える光干渉型変調器は緑色光を射出する。換言すれば、外部から来る光が透明基板110、第一電極130および光学的フィルム140を透過する時、光はそれぞれの第二電極150に到達する前に異なるエアー・ギャップ厚d1、d2、d3を通過する必要がある。その後光は第二電極150によって後方へ反射された後、透明基板110から出射する。異なるエアー・ギャップ厚における干渉度合いの相違により赤色光、緑色光および青色光が作り出される。
【0007】
従来の光干渉型変調器においては、第二電極150は良好な機械的特性を備える反射材を使用して製造されなければならない。第二電極150および第一電極130がバイアス電圧に接続される時、第二電極150は静電引力により第一電極130に向かって移動する。第二電極150のいかなる移動もエアー・ギャップd1、d2およびd3の僅かな変動に結びつくことになる。エアー・ギャップ厚d1、d2およびd3の僅かな変化によって、ディスプレイ内部の色々な光干渉型変調器(ピクセル)を「オン」または「オフ」状態に切換えることができる。
【0008】
光干渉型カラーディスプレイ100において、ディスプレイ上の画像は、カラーシフトの増大とコントラスト比の劣化が原因となり使用者の視る角度によって影響され得る。こうして従来技術は、カラーシフトとコントラスト比の改善のために、透明基板110の外側表面へ光拡散プレート160の取り付けが必要となる場合が多い。しかしながら、光拡散プレートの取り付けにより、カラーディスプレイ100の全体的な厚み(約2mmの追加厚み)が増加するのみでなく、材料コストも増加する。
【0009】
【発明が解決しようとする課題】
従って本発明の一つの目的は、パネルの外側に光拡散プレートを取り付ける代わりに、パネルの内側にフィルム層を形成することによって改良されたカラーシフトとコントラスト比を持つ光干渉型カラーディスプレイを提供することである。
【0010】
【課題を解決するための手段】
これらおよび他の利点を達成するため、および本発明の目的に従って、ここに具体化されかつ概括的に説明されるように、本発明は光干渉型カラーディスプレイを提供する。光干渉型カラーディスプレイは、主に透明基板、内側前方光拡散層、複数の第一電極、パターン化支持層、複数の光学的フィルムおよび複数の第二電極を有する。内側前方光拡散層は、透明基板上に配置される。第一電極は、内側前方光拡散層上に配置される。パターン化支持層もまた内側前方光拡散層上に配置されるが、第一電極間に配置される。光学的フィルムは、第一電極の上に配置される。第二電極はそれぞれの第一電極の上に配置され、パターン化支持層によって支持される。更に各第一および第二電極対の間に、エア・ギャップが存在する。
【発明の実施の形態】
【0011】
この実施例において、内側前方光拡散層は例えば第一および第二フィルムを有する。第一フィルムは透明基板上に直接取り付けられ、第二フィルムは第一フィルム上に配置される。第一フィルムと第二フィルム間の境界面は、更に分散表面を提供する。第一フィルムはインジウム錫酸化物を使用して製造され、第二フィルムは例えば窒化珪素または酸化珪素を使用して製造される。
【0012】
この実施例において、第一電極に面する第二電極の表面は、更に内側後方光拡散層を有する。内側後方光拡散層は、内側前方光拡散層を製造するのと同じプロセスにより光干渉型カラーディスプレイ上に製造される。その上、本発明はまた内側前方光拡散層を持たずに、内側後方光拡散層の形成も可能とする。
【0013】
この実施例において、内側後方光拡散層はパターン化支持層によって支持され、かつエア・ギャップによって第一電極から分離される。内側後方光拡散層は、例えば第三フィルムおよび第四フィルムを有する。第三フィルムは第一電極上に直接取り付けられ、第四フィルムは第三フィルムの上に配置される。第三フィルムと第四フィルム間の境界面は、更に分散表面を形成する。第三フィルムはインジウム錫酸化物を使用して製造され、第四フィルムは例えば窒化珪素または酸化珪素を使用して製造される。
【0014】
この実施例において、透明基板は例えばガラス基板である。第一電極は、例えばインジウム錫酸化物を使用して製造される透明電極である。第二電極は、例えばモリブデン、モリブデン合金、アルミニウムまたはアルミニウム合金、クロミウム、または他の導電性金属材料を使用して製造される金属電極である。
【0015】
この実施例において、光学的フィルムは、例えば少なくとも一つの第一誘電体フィルムと、少なくとも一つの第二誘電体フィルムとを有する。第二誘電体フィルムと第一誘電体フィルムは、互いに交互に積み重ねられる。第二誘電体フィルムは、第一誘電体フィルムとは異なる誘電率を持つ。
【0016】
本発明は、内側前方光拡散層と内側後方光拡散層とを選択的に配備することを可能にする。光拡散層は従来設計で取り付けられる光拡散プレート構造を置き換えて、カラーシフトおよびコントラスト比を含むディスプレイ特性を改善する。
【0017】
上記の一般的説明と下記の詳細な説明は共に例示的であり、特許請求される本発明の更なる解説を与えるように意図されている、ということが理解されるべきである。
添付図面は本発明の更なる理解を与えるために含まれ、かつ本明細書の一部に組込まれ、その一部を構成する。図面は本発明の実施例を図示し、かつ説明と共に本発明の原理を解説するために役立つものである。
【0018】
ここで本発明の現在の好適実施例について詳細に言及し、その例が添付図面に図示される。可能なところでは同一または類似部分を指すために、図面および説明に同一番号が使用される。
【0019】
図2は、本発明の第一好適実施例による光干渉型カラーディスプレイ構造の略式断面図である。図2に示されるように、光干渉型カラーパネル200は主に、透明基板210、内側前方光拡散層300、パターン化支持層220、複数の第一電極230、複数の光学的フィルム240および複数の第二電極250を有する。内側前方光拡散層300は例えば透明基板210の上に配置され、透明基板210の全表面をカバーする。パターン化支持層220もまた、第二電極250の端部を支持するために透明基板210の上に配置される。第一電極230は、透明基板210上に配置される。光学的フィルム240は、第一電極230上に配置される。第二電極250はそれぞれの第一電極230の上方に配置され、パターン化支持層220によって支持される。
【0020】
この実施例において、透明基板210は例えばガラス基板または他のある透明材料から作られる基板である。パターン化支持層220は、例えば樹脂性材料を使用して製造された複数の円筒体を含むことができる。第一電極230は、例えばインジウム錫酸化物(ITO)を使用して製造された透明電極である。光学的フィルム240は、例えば互いに交互に積み重ねられた少なくとも一つの第一誘電体フィルム240aと第二誘電体フィルム240bとを有する。第二誘電体フィルム240bは第一誘電体フィルム240aとは異なる誘電率を持つ。第二電極250は反射電極として作用するので、第二電極250は良好な機械的特性を持たなければならない。従って第二電極250は、例えばアルミニウムまたはアルミニウム合金を含む頑強な材料を使用して製造される。
【0021】
カラーディスプレイを生産するために、光干渉型カラーパネル200内部の光干渉型変調器は、三つの異なるエア・ギャップ厚(d1、d2およびd3)を備えて製造される。例えば、d1のエア・ギャップ厚を持つ光干渉型変調器は赤色光を射出する。同様にd2のエア・ギャップ厚を持つ光干渉型変調器は青色光を射出し、d3のエア・ギャップ厚を持つ光干渉型変調器は緑色光を射出する。換言すれば、透明基板210、内側前方光拡散層300、第一電極230および光学的フィルム240を通過する外部の光は、第二電極250に反応する前に異なる厚みのエア・ギャップ(d1、d2、d3)を通過しなければならないことになる。その後光は、透明基板210を通して出力ビームとして出射するために、第二電極250から後方へ反射される。光学的経路による異なる干渉度合いのために、赤色、緑色および青色光が作り出される。
【0022】
一般的に第二電極250は反射電極として働き、良好な機械的特性を持つ。バイアス電圧が第二電極250と第一電極230間に印加される時、第二電極250は静電引力によって第一電極230に向かって僅かに移動する。このような移動は、光干渉型変調器内部のエアー・ギャップd1、d2、d3を変化させる。換言すれば、光干渉型変調器内部のエアー・ギャップ厚d1、d2またはd3の変化により、光干渉型変調器(ピクセル)の「オン」または「オフ」状態が設定される。
【0023】
カラーシフトを改善しかつコントラスト比の劣化を低減するために、本発明もまた透明基板210上に内側前方光拡散プレート300を設ける。内側前方光拡散プレート300は、例えば第一フィルム302と第二フィルム304を有する。第一フィルム302は透明基板210に取り付けられ、第二フィルム304は第一フィルム302の上に配置される。第一フィルム302と第二フィルム304間の境界面は、分散表面を形成する。第一フィルム302は、例えばインジウム錫酸化物を含む材料を使用して製造される。第二フィルム304は、例えば窒化珪素または酸化珪素を含む材料を使用して製造される。更に内側前方光拡散プレート300は下記の表1に示される処置条件によって、例えばプラズマ強化化学気相成長法(PECVD)を行うことにより、透明基板210の上に形成される。
【表1】
【0024】
図3は、本発明の第二好適実施例による光干渉型カラーディスプレイ構造の略式断面図である。図3に示されるように、内側後方光拡散層400は第一電極230に面する第二電極250の表面上に形成される。内側後方光拡散層400はパターン化支持層220によって支持され、d1、d2、d3のエア・ギャップ厚で第一電極230から分離される。内側後方光拡散層400は、例えば第三フィルム402および第四フィルム404を有する。第三フィルム402は第一電極230の上に配置され、第四フィルム404は第三フィルム402の上に配置される。第三フィルム402と第四フィルム404間の境界面は、分散表面を設ける。第三フィルム402は、例えばインジウム錫酸化物を含む材料を使用して製造される。第四フィルム404は、例えば窒化珪素または酸化珪素を含む材料を使用して製造される。
【0025】
図4は、本発明の第三好適実施例による光干渉型カラーディスプレイ構造の略式断面図である。図4に示されるように、光干渉型カラーディスプレイは第一および第二実施例と同様な構造を持つ。一つの大きな相違は、内側前方光拡散層300および内側後方光拡散層400が光干渉型カラーパネル200の内部に形成されていることである。内側前方光拡散層300および内側後方光拡散層400を統合的にまとめた後、カラーシフトおよびコントラスト比の劣化は改善され、光干渉型カラーパネル200におけるより全体的に良好な性能が達成できる。
【0026】
【発明の効果】
結論として、光干渉型カラーパネルは少なくとも次の利点を有する。すなわち、
1.カラーシフトおよびコントラスト比の劣化の双方を改善するために、従来取り付けられている光拡散プレートに取って代わって、内側前方光干渉層および内側後方光干渉層を選択的あるいは両方一緒に使用できる。
2.内側前方光拡散層および/または内側後方光干渉拡散層は、プラズマ強化化学気相成長法を施すことにより製造できる。この製造方法は、色々な光拡散層の分散を含む光学的特性を制御するのに、一層効果的である。換言すれば、パネルの全体的な輝度が増加される。
【0027】
当該技術に習熟した人々にとって、本発明の範囲と意図から逸脱することなしに色々な修正や変更が本発明の構造に為され得る、ということは明白であろう。前記事項を考慮して、この発明の修正や変更が前述の特許請求の範囲とその等価性の範囲に入るならば、本発明はこの発明の修正や変更をもカバーする、ということが意図されている。
【図面の簡単な説明】
【図1】従来の光干渉型カラーディスプレイ構造の略式断面図である。
【図2】本発明の第一好適実施例による光干渉型カラーディスプレイ構造の略式断面図である。
【図3】本発明の第二好適実施例による光干渉型カラーディスプレイ構造の略式断面図である。
【図4】本発明の第三好適実施例による光干渉型カラーディスプレイ構造の略式断面図である。
【符号の説明】
100 光干渉型カラーディスプレイ
110 透明基板
120 パターン化支持層
130 第一電極
140 光学的フィルム
150 第二電極
160 光拡散プレート
200 光干渉型カラーパネル
210 透明基板
220 パターン化支持層
230 第一電極
240 光学的フィルム
240a 第一誘電体フィルム
240b 第二誘電体フィルム
250 第二電極
300 内側前方光拡散プレート(層)
302 第一フィルム
304 第二フィルム
400 内側後方光拡散層
402 第三フィルム
404 第四フィルム
Claims (5)
- 透明基板、
前記透明基板上の内側前方光拡散層、
前記内側前方光拡散層上の複数の第一電極、
前記内側前方光拡散層上のパターン化支持層、ここで前記パターン化支持層は前記第一電極の間にあり、
前記第一電極上の複数の光学的フィルム、および
それぞれの第一電極の上方の複数の第二電極を有し、
ここで、前記第二電極は前記パターン化支持層によって支持され、かつ第二電極と第一電極の総ての対の間にエア・ギャップが存在することを特徴とする光干渉型カラーディスプレイ。 - 前記内側前方光拡散層は更に、
前記透明基板上の第一フィルム、および
前記第一フィルム上の第二フィルムを有し、
ここで、前記第一フィルムと前記第二フィルム間の境界面は分散表面を形成することを特徴とする請求項1に記載のカラーディスプレイ。 - 前記カラーディスプレイは更に、
前記第一電極の表面に向き合う前記第二電極に内側後方光拡散層を有し、かつ前記内側後方光拡散層とそれぞれの第一電極との間にエア・ギャップが存在することを特徴とする請求項1に記載のカラーディスプレイ。 - 前記内側後方光拡散層は更に、
前記第一電極上に前記パターン化支持層によって支持される第三フィルム、および
前記第三フィルム上の第四フィルムを有し、
ここで、前記第三フィルムと第四フィルム間の境界面は分散表面を形成することを特徴とする請求項3に記載のカラーディスプレイ。 - 透明基板、
前記透明基板上の複数の第一の電極、
前記透明基板上のパターン化支持層、ここで前記パターン化支持層は前記第一電極の間にあり、
前記第一電極上の複数の光学的フィルム、
前記第一電極上の複数の第二電極、ここで前記第二電極は前記パターン化支持層によって支持され、かつ前記第二電極とそれぞれの第一電極との間にエア・ギャップが存在し、および
前記第一電極のそれぞれの表面に向き合う第二電極上の光拡散層を有し、ここで、前記光拡散層と前記第一電極との間にエア・ギャップが形成されることを特徴とする光干渉型カラーディスプレイ。
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2002
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2003
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- 2003-05-15 JP JP2003136788A patent/JP3996546B2/ja not_active Expired - Fee Related
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2004
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Also Published As
Publication number | Publication date |
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US7038752B2 (en) | 2006-05-02 |
US20080137175A1 (en) | 2008-06-12 |
US20050024557A1 (en) | 2005-02-03 |
TW200411274A (en) | 2004-07-01 |
TWI289708B (en) | 2007-11-11 |
JP3996546B2 (ja) | 2007-10-24 |
US7342709B2 (en) | 2008-03-11 |
US20040125281A1 (en) | 2004-07-01 |
KR20040057870A (ko) | 2004-07-02 |
US9025235B2 (en) | 2015-05-05 |
KR100537372B1 (ko) | 2005-12-19 |
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