JP2005517293A - コンパクトなディスプレイアセンブリ - Google Patents

コンパクトなディスプレイアセンブリ Download PDF

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Publication number
JP2005517293A
JP2005517293A JP2003566836A JP2003566836A JP2005517293A JP 2005517293 A JP2005517293 A JP 2005517293A JP 2003566836 A JP2003566836 A JP 2003566836A JP 2003566836 A JP2003566836 A JP 2003566836A JP 2005517293 A JP2005517293 A JP 2005517293A
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Prior art keywords
assembly
screen
display
flexible
edge
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JP2003566836A
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JP4209333B2 (ja
Inventor
カイア シルバーブルック,
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シルバーブルック リサーチ ピーティワイ リミテッド
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Publication of JP2005517293A publication Critical patent/JP2005517293A/ja
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/14Structural association of two or more printed circuits
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/18Printed circuits structurally associated with non-printed electric components
    • H05K1/189Printed circuits structurally associated with non-printed electric components characterised by the use of a flexible or folded printed circuit

Abstract

コンパクトなディスプレイアセンブリは、パッシブLCD画面やOLEDディスプレイ画面などのフレキシブルディスプレイ画面を含んでいる。ディスプレイ画面の駆動回路を含んでいる印刷回路基板は、ディスプレイを二つに折りたたむか又は曲げてコンパクトな形状にすることができる画面の縦領域を定義する配置形状で、ディスプレイの後部に配置されている。このアセンブリは、ラップトップコンピュータや電子ブックなどの電子コンピュータデバイスに含めることができる。

Description

発明の分野
本発明は、コンパクトなディスプレイアセンブリに関する。具体的な実施形態においては、本発明は、液晶ディスプレイ(LCD)を組み込んでいるディスプレイアセンブリに関する。ただし、有機発光ダイオード(OLED)ディスプレイなどの他のディスプレイを使用することもできる。
関連技術の説明
現在では、可撓性を有する(フレギシブル)板(例えばプラスチックフィルム)から作製される基板を有するLCDデバイスを得ることができる。このようなデバイスは、平らでない面に取り付けることができる。このようなLCDの一つは、Bennettに対する米国特許第4,674,840号に説明されている。より最近では、米国特許第6,204,902号に、別のフレキシブルLCDデバイスが説明されている。
現在、OLEDディスプレイの開発に関連する研究が相当に行われている。OLEDディスプレイは、二つの電極の間に極めて薄いポリマー層をはさむ多層プロセスによって作製される。まず、ITO(インジウムスズ酸化物)の透明導体からの原子の数層を、透明で可撓性を有するキャリアフィルム(carrier film)上にスパッタリングして陽極を形成する。この陽極に、エレクトロルミネセントポリマーの非常に薄い層によるスピンコーティングを行う。溶媒によって液化したポリマーが、遠心力によって極めて均一に広がる。最終ステップで、様々な金属の組み合わせである機械的に柔軟性のある陰極を、このコンポーネント上にスパッタリングする。最終生成物は、可撓性を有し、厚さ500nm未満である。
フレキシブルディスプレイが組み込まれているディスプレイアセンブリの製造には、いくつかの問題が存在する。一つの問題は、ディスプレイは可撓性を有しているが、強く折り曲げられると、損傷したり動作が損なわれることである。別の問題は、ディスプレイは可撓性を有しているが、関連する駆動回路が最も容易に取り付けられるのは堅いプリント回路基板であることである。従って、フレキシブルディスプレイと一枚以上の堅い回路基板との間に複数の接続を形成する必要があり、これは難しい。
発明の概要
本発明の目的は、フレキシブルディスプレイが組み込まれているディスプレイデバイスであって、折り目を生じさせずにディスプレイを二つに折りたたむか又は曲げることができるように構成されているディスプレイアセンブリを提供することである。
本発明によると、
複数の接続点を有するフレキシブルディスプレイ画面と、
画面の後部に位置しており、間に画面の縦領域を定義している少なくとも二枚の印刷回路基板と、
領域内に位置している接続点と印刷回路基板のそれぞれの間とのフレキシブルコネクタと、
を含んでいるディスプレイアセンブリであって、
フレキシブルコネクタが、縦領域を中心にアセンブリを閉じる動作に対応するのに十分な長さである、ディスプレイアセンブリが提供される。
フレキシブルコネクタは、ワイヤのルーム(loom)を備えていることができる。
印刷回路基板は、テープ自動ボンディング(tape automated bonding)フィルムによってワイヤのルームに接続されていることが好ましい。
一般には、画面の形状は長方形であり、画面の縁と印刷回路基板(PCB)の縁とが三角形を画成しており、フレキシブルコネクタの終端がこの三角形の縁に沿って形成されている。
画面のこの縁とPCBの縁は、直角三角形を定義しており、かつ、フレキシブルコネクタの終端が三角形の斜辺に沿って形成されていることが好ましい。
印刷回路基板は、斜辺の長さの合計がディスプレイ画面の合計長さに等しい形状であることが好ましい。
フレキシブルコネクタは、画面の縦領域を定義している印刷回路基板の縁に沿ってその終端を形成することができる。
好ましい実施形態においては、画面は、フレキシブル液晶ディスプレイを備えている。
これに代えて、画面は、有機発光ダイオードディスプレイを備えていることができる。
ディスプレイアセンブリは、ラップトップコンピュータや電子ブックなどのコンピュータデバイス(computational device)に組み込むことができる。
詳細な説明
本発明を実施する方法を通常の技能者が理解することかできるように、以下に、本発明の好ましい実施形態について説明する。
図1は、先行技術の代表的なパッシブマトリクスディスプレイアセンブリの略図を示している。液晶ディスプレイ12は、ドットパターンイメージを表示するように設計されている。液晶ディスプレイの全体にわたり、複数のロー電極とコラム電極とが横と縦に配置されている。電極の接続点は、液晶ディスプレイの縁に沿って位置している。
回路基板14,18は、テープ自動ボンディング(TAB)フィルム22,24によってLCDのロー電極とコラム電極に結合されている。PCB14,18は、それぞれ、ロードライバチップ26とコラムドライバチップ28を含んでいる回路を支持しており、これらのチップは、液晶素子(liquid crystal cell)を選択的にアクティブにして表示を形成するために、選択されたロー電極とコラム電極に電位を印加することを目的としている。ラップトップコンピュータや携帯電話などの装置に取り付けるため、印刷回路基板18,14は、ディスプレイアセンブリの後面図である図2に示したように、画面の後ろに折りたたむことができる。
LCD12を曲げると、PCB14及び18のそれぞれへのTAB接続22,24に歪みが生じることが理解されるであろう。
次に、本発明の好ましい実施形態について、図3を参照しながら説明する。図3は、ディスプレイのロー電極に接続するためのTAB接続部32,34を含んでいるフレキシブルLCD画面30を描いている。
フレキシブルLCD画面30の下縁の下に、角度のついた2枚のTAB帯片36,38が配置されている。角度のついた2枚のTAB帯片のそれぞれの接続点は、それぞれ、フレキシブルワイヤルーム40,42によってLCDディスプレイのコラム電極に接続されている。留意点として、いま説明している実施形態においては、TAB帯片36沿いの距離LIは、このTAB帯片がワイヤルーム42によって接続されているコラム電極に沿った距離LIに等しい。従って、コラム電極の間の距離は、TAB帯片における接点の間の距離として維持されており、このことはいくつかの状況において望ましい。この配置構成は、左側のTAB帯片38についても同じで、長さL2=L1である。
図4は、図3のディスプレイの後面図を示しており、PCB44,46がTAB帯片32〜38の取り付けられている。留意点として、PCBの縁A−A’及びB−B’によって画成されている画面の縦領域には、折り目を生じさせることなくディスプレイを二つに曲げるか又は折りたたむための十分な幅が存在している。画面30の下縁41と、PCB46の縁A−A’と、TABフィルム38は、直角三角形39を画成している。同様に、PCB44の縁B−B’とTABフィルム36によって三角形37が画成されている。
図5に示したディスプレイアセンブリは、二つに曲げられてコンパクトな形状になっている。図5に示したように画面を折りたたむと、線A−A’及びB−B’(図3)の間の領域内のコラム電極接続点をTAB帯片36,38に接続しているワイヤがピンと張る。従って、図6に示したようにアセンブリが開いた形状のときには、ワイヤルーム40,42にある程度のたるみが存在している必要がある。
ラップトップコンピュータや電子ブックなどのコンピュータデバイスは、コンパクトなデバイスの形成を容易にするため、ヒンジ又はその他の折りたたみ式ハウジングを使用してディスプレイアセンブリを組み込むように設計することができる。
図7は、本発明の更なる実施形態を示している。図7は、PCB54,56が画面の底部から突き出していないディスプレイアセンブリの後面を示している。この場合、A−A’とB−B’の間の領域内のコラム電極接続点52が、PCB54,56の内縁の接続点60,62にフレキシブルコネクタ58によって接続されている。
当然ながら、図3〜図7を参照しながら説明した実施形態以外の本発明のバリエーションが可能である。例えば、有機発光ダイオード画面など、別のタイプのフレキシブルディスプレイ画面を使用することができる。更に、電極接点と角度のついたTABフィルム38,36(図4)との間の接続を、ワイヤルーム以外の手段によって形成することができる。例えば、上に導電性トレース(conductive trace)を持つフレキシブルフィルムを使用して接続を形成することができる。好ましい実施形態では、二枚の印刷回路基板によって画面の縦の曲げ領域が画成されているが、2枚以外の枚数の回路基板によって本発明の実施形態を構築することも可能である。
本明細書では本発明の好ましい実施形態を詳細に説明したが、はっきり理解すべき点として、この分野の当業者が考案することのできる、本明細書に示した基本的な発明概念の多数のバリエーション若しくは修正、又はその両方も、添付されている請求項に定義されている本発明の精神及び範囲の中に依然として含まれる。
先行技術のディスプレイアセンブリの前部の平面図である。 先行技術のディスプレイアセンブリの後部の平面図である。 ディスプレイの前部の平面図である。 本発明の実施形態によるディスプレイアセンブリの後部の平面図である。 本発明の実施形態によるアセンブリの、コンパクトな形状における透視図である。 本発明の実施形態によるアセンブリの、表示形状における平面図である。 本発明の更なる実施形態によるディスプレイアセンブリの、コンパクトな形状における後部の平面図である。

Claims (11)

  1. 複数の接続点を有するフレキシブルディスプレイ画面と、
    前記画面の後部に位置しており、かつ、間に前記画面の縦領域を定義している少なくとも二枚の印刷回路基板と、
    前記領域内に位置している接続点と前記印刷回路基板のそれぞれの間とのフレキシブルコネクタと、
    を含んでいるフレキシブルディスプレイアセンブリであって、
    前記フレキシブルコネクタが、前記縦領域を中心に前記アセンブリを閉じる動作に対応するのに十分な長さである、フレキシブルディスプレイアセンブリ。
  2. 前記フレキシブルコネクタがワイヤルームを備えている、請求項1に記載のアセンブリ。
  3. 前記印刷回路基板がテープ自動ボンディングフィルムによって前記ワイヤルームに接続されている、請求項2に記載のアセンブリ。
  4. 前記画面の縁と前記PCBの縁とが三角形を画成しており、かつ、前記フレキシブルコネクタの終端が前記三角形の縁に沿って形成されている、請求項1に記載のアセンブリ。
  5. 前記画面の前記縁と前記PCBの縁とが直角三角形を画成しており、前記フレキシブルコネクタの終端が前記三角形の斜辺に沿って形成されている、請求項4に記載のアセンブリ。
  6. 前記PCBが、前記斜辺の長さの合計が前記ディスプレイ画面の前記長さに等しい形状である、請求項5に記載のアセンブリ。
  7. 前記フレキシブルコネクタの終端が、前記画面の縦領域を画成している前記印刷回路基板の縁に沿って形成されている、請求項1に記載のアセンブリ。
  8. 前記画面がフレキシブル液晶ディスプレイを備えている、請求項6又は7に記載のアセンブリ。
  9. 前記画面が、有機発光ダイオードディスプレイを備えている、請求項6又は7に記載のアセンブリ。
  10. 請求項1に記載のアセンブリを含んでいるコンピュータデバイス。
  11. 請求項6又は7に記載のアセンブリを含んでいるコンピュータデバイス。
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US20050139684A1 (en) 2005-06-30
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US6886751B2 (en) 2005-05-03
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