JP3954152B2 - Connection structure of panel substrate and flexible wiring board, and liquid crystal display device using the same - Google Patents

Connection structure of panel substrate and flexible wiring board, and liquid crystal display device using the same Download PDF

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JP3954152B2
JP3954152B2 JP10910397A JP10910397A JP3954152B2 JP 3954152 B2 JP3954152 B2 JP 3954152B2 JP 10910397 A JP10910397 A JP 10910397A JP 10910397 A JP10910397 A JP 10910397A JP 3954152 B2 JP3954152 B2 JP 3954152B2
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substrate
liquid crystal
wiring board
flexible wiring
electrode
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JPH10301130A (en
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正浩 有山
岡野　　光隆
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Citizen Holdings Co Ltd
Citizen Watch Co Ltd
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Citizen Holdings Co Ltd
Citizen Watch Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/36—Assembling printed circuits with other printed circuits
    • H05K3/361—Assembling flexible printed circuits with other printed circuits

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  • Liquid Crystal (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、携帯電話やＰＨＳ等の液晶表示モニター等に用いられている液晶表示装置に関するものである。
【０００２】
【従来の技術】
従来の液晶表示装置において、液晶表示パネルと、該液晶表示パネルを外部回路により制御し駆動する外部回路基板との間をフレキシブル配線板を使用して接続する方法が従来から用いられている。以下、従来の技術について、図面を参照しながら説明する。図８は、従来のフレキシブル配線板と液晶表示パネルを接続した液晶表示装置の斜視図を示し、図９は図８におけるＣ−Ｃ断面図を示している。図８及び図９において、液晶表示装置１００は、透明フイルム又は透明ガラスよりなる透明基板の上に直線状の電極である第１電極５４を平行に配設し、さらに第１電極５４の上面に配向膜（図示せず）を形成して第１透明基板５０を形成する。また透明フイルム又は透明ガラスよりなる基板の上に直線状の電極である第２電極７４を平行に配設し、さらに第２電極７４の上に配向膜（図示せず）を形成して第２透明基板７０を形成した透明基板を有し、第１透明基板５０に配設された第１電極５４と第２透明基板７０に配設された第２電極７４とが直交し対向するように第１透明基板５０と第２透明基板７０とを間隙を設けて配置され、前記間隙の周囲にはシール８２が配設され、シール８２の内側の間隙には液晶８４が封入された構成を形成している。また、第１透明基板５０の上面に平行に配設された第１電極５４を第２透明基板７０に配設された第２電極７４に対して接続するために、トランスファー６０が設けられている。
【０００３】
一方、第２透明基板７０の１辺には延出部７２が設けられていると共に、該延出部７２には液晶を駆動するＩＣである駆動ＩＣ８０が実装されており、延出部７２には外部接続用の端子電極７８が配設されており、端子電極７８には外部回路との接続を行うためのフレキシブル配線板１１０が接続された構成を有している。
また、図１０は液晶表示装置における駆動ＩＣとフレキシブル配線板の位置関係を示した平面図である。
【０００４】
【発明が解決しようとする課題】
従来の駆動ＩＣとフレキシブル配線板との位置関係は図８及び図１０に示されるように、巾方向の略中央部であって、駆動ＩＣ８０に対してフレキシブル配線板１１０が直列の位置関係になるように配置されていた。 該フレキシブル配線板１１０の接着は圧着強度を保つために、図１０に示すように第２透明基板７０の延出部７２に対する接着代Ｌ１２を最低でも２m/m 程度以上は確保する必要性があった。 このため、延出部７２の寸法Ｌ１３は長くなり、液晶表示装置１００の縦方向の寸法Ｌ１も長くなって液晶表示装置が大型化してしまうという問題点を有していた。
【０００５】
また、接着代Ｌ１２の面積を広く設定できないため、フレキシブル配線板１１０の接着力が弱くフレキシブル配線板１１０の両端部が剥離してしまう虞れがあり、信頼性に欠ける面もあった。これを補強するためにフレキシブル配線板１１０の両端部に、図１０に示すようなダミ−電極９０を設ける場合があり、コスト上昇の要因となっていた。
本発明は、上記事情に鑑みてなされたものであって、液晶表示装置の小型化を図り、接着強度を向上させると共に、信頼性が向上し低コスト化可能な液晶表示装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記課題を解決するための本発明の第１の手段は、複数の線状の電極よりなる第１電極を有する第１基板と複数の線状の電極よりなる第２電極を有する第２基板が前記電極を交差する如く対向して配設し前記基板の間に液晶を封止したパネルの第１基板の基板端から延出した第２基板の延出部に接続されるフレキシブル配線板と１つのＩＣが配設された構成を有するパネルの基板とフレキシブル配線板の接続構成において、前記第１基板の前記基板端の側方に配設された導通部材で前記第１基板上の前記第１電極と前記第２基板の上の前記第１電極の配線電極とが接続され前記延出部の前記導通部材に寄せて前記ＩＣを配設し前記ＩＣから前記第１電極への配線を短くし前記導通部材と反対側の前記ＩＣの側方には前記ＩＣの前記第２基板の基板端側の辺と前記第１基板の基板端との間の前記延出部上に端子電極を配設しこの端子電極に前記フレキシブル基板の少なくとも先端を接続したことを特徴とするパネルの基板とフレキシブル配線板の接続構成である。
【０００７】
上記課題を解決するための本発明の第２の手段は、本発明の第１の手段に於て前記延出部の幅が前記第１基板の幅とほぼ同じであることを特徴とするパネルの基板とフレキシブル配線板の接続構成である。
【０００８】
上記課題を解決するための本発明の第３の手段は、上記本発明の第１または第２の手段において前記延出部上の前記フレキシブル基板の先端が、前記ＩＣの前記第２基板の基板端側の辺と前記ＩＣの前記第１基板側の辺との間の前記延出部上に配設されたことを特徴とするパネルの基板とフレキシブル配線板の接続構成である。
【０００９】
上記課題を解決するための本発明の第４の手段は、本発明の第１乃至第３のいずれか一の手段において前記パネルが液晶パネルであることを特徴とするパネルの基板とフレキシブル配線板の接続構成である。
【００１０】
上記課題を解決するための本発明の第５の手段は、本発明の第１乃至第４のいずれか一の手段におけるパネルの基板とフレキシブル配線板の接続構成を用いた液晶表示装置である。
【００１２】
【発明の実施の形態】
図１から図７は本発明の実施例を示した図であり、図１は本発明に係る液晶表示装置の主要部で、駆動ＩＣとフレキシブル配線板が配置された液晶表示装置の斜視図を示している。図２は図１のＡ−Ａ線で切断した場合の断面図、図３は図１のＢ−Ｂ断面図で、延出部７２の端子電極７８にフレキシブル配線板１０が異方性導電接着剤６３を介して接続された状態の断面を示している。図４は、図３の円で囲まれた部分の拡大図である。図５は、本発明に係る第１の実施例である液晶表示装置１における駆動ＩＣ８０とフレキシブル配線板１０の位置関係を示した平面図である。図６は、本発明に係る第２の実施例である液晶表示装置１における駆動ＩＣ８０とフレキシブル配線板１０の位置関係を示した平面図である。図７は、本発明に係る第３の実施例である液晶表示装置１における駆動ＩＣ８０とフレキシブル配線板１０の位置関係を示した平面図である。
以下、本発明に係る液晶表示装置の実施の形態について、図面を参照しながら説明するが、液晶表示装置１の基本構成は従来例と同様であるため、従来技術と同様な部分は従来技術と同じ番号を付けて説明する。
【００１３】
図１において、液晶表示装置１は、透明フイルム又は透明ガラスよりなる透明基板の上に、図５または図６または図７に示すように直線状の電極である第１電極５４を平行に配設し、さらに図２に示すように第１電極５４の上面に配向膜（図示せず）を形成して第１透明基板５０を形成する。また透明フイルム又は透明ガラスよりなる基板の上に、図５に示す直線状の電極である第２電極７４を平行に配設し、さらに第２電極７４の上に図２に示す配向膜（図示せず）を形成して第２透明基板７０を形成した透明基板を有し、第１透明基板５０に配設された第１電極５４と第２透明基板７０に配設された第２電極７４とが図５に示すように直交し対向するように第１透明基板５０と第２透明基板７０とを間隙を設けて配置され、前記間隙の周囲にはシール８２が配設され、シール８２の内側の間隙には液晶（図示せず）が封入された構成を形成している。また、図２に示すように第１透明基板５０の上面に平行に配設された第１電極５４を第２透明基板７０に配設された駆動ＩＣ８０と接続するために、第１透明基板５０と第２透明基板７０の間に導通部材であるトランスファー６０が設けられている。
【００１４】
さらに第２透明基板７０の１辺には延出部７２が設けられていると共に、延出部７２には液晶を駆動するＩＣである駆動ＩＣ８０が実装されており、外部接続用の端子電極７８が配設されている。
フレキシブル配線板１０は図３に示す構造を有しており、延出部７２の上面に形成された端子電極７８に対して、フレキシブル配線板１０の片側面に形成された配線板電極８８を導電性接着剤６３を介して接続している。
【００１５】
以上のような構成において本発明に係る液晶表示装置は、図１及び図７に示すように、第２透明基板７０の延出部７２に接続する駆動ＩＣ８０とフレキシブル配線板１０とを並列に配置して、フレキシブル配線板１０の先端部が駆動ＩＣ８０に対して略横並びとなるように配設させている。
これによって、図５に示すように、フレキシブル配線板１０の第２透明基板７０の延出部７２に対する接着代Ｌ２を許容範囲内において２ｍ／ｍ以上に設定しても、延出部７２の寸法Ｌ３は図１０に示す従来の延出部７２の寸法Ｌ１３（図１０）よりも小さく設定でき、液晶表示装置１の縦方向の寸法Ｌは、従来の縦方向の寸法Ｌ１（図１０）に対して短縮できる。
さらに、第２透明基板７０の延出部７２に接続する駆動ＩＣ８０は、第２透明基板７０の巾方向の片側に位置するトランスファー６０が配設されている一方側に配設すると共に、第２透明基板７０の延出部７２の巾方向中央部に対して前記トランスファー６０側とは反対方向にフレキシブル配線板１０を配設している。従って、従来駆動ＩＣ８０が占めていたスペースを相互に並列に分け合う形となり、有効に利用できることとなる。
【００１６】
さらに又、第２透明基板７０の延出部７２に接続するフレキシブル配線板１０は、第２透明基板７０の透明電極面に対して異方性導電接着剤６３を介して電気的に且つ機械的に接続している。 これによって図４に示されるように、導電粒子Ｄはフレキシブル配線板１０の上面から加熱ヘッドで圧力を加えると、導電粒子Ｄがフレキシブル配線板１０の配線板電極８８と第２透明基板７０の延出部７２に設けられた端子電極７８とに挟まれた部分で導電粒子Ｄ１となり、縦方向で導通状態となる。しかし、配線板電極８８と端子電極７８に挟まれていない部分では、導電粒子Ｄ２の状態で縦方向では非導通状態が維持されることとなる。このため、少ない接着代Ｌ２で電気的に短距離で接続され且つ機械的に強力に接着でき、信頼性のある効果が得られる。或いは接着代Ｌ２を駆動ＩＣ８０の表示画面側端辺まで増加させることにより、より強力な接着力が得られる。
【００１７】
また、図６に示された如く、駆動ＩＣ８０と第１透明基板５０の間の隙間が大きいときには、フレキシブル配線基板１０の液晶側端部が駆動ＩＣ８０の液晶側端部より液晶側に突出して配設することでフレキシブル配線基板１０の接着強度が十分に得られる。
【００１８】
また、図５に示された如く、駆動ＩＣ８０と第１透明基板５０の間の隙間が狭く、さらに駆動ＩＣ８０と第２透明基板７０の端辺との間が狭いときには、フレキシブル配線基板１０の液晶側端部が駆動ＩＣ８０の幅の間に配設することでフレキシブル配線基板１０の接着強度が十分に得られる。
【００１９】
また、図７に示された如く、駆動ＩＣ８０と第２透明基板７０の端辺との間が広いときには、
フレキシブル配線基板１０の液晶側端部が駆動ＩＣ８０の液晶側端部と反対側の端部と、第２透明基板７０の端部との間に配設することでフレキシブル配線基板１０の接着強度が得られる。
【００２０】
このように、図５から図７に示したように、第２透明基板７０上の配線電極及び駆動ＩＣ８０の配置及び第１透明基板５０の配置によりフレキシブル配線基板１０の接着位置を適切に取ることで、必要な接着強度が得られ小型な液晶表示装置が得られる。
【００２１】
以上のように、本発明に係る実施例を具体的に説明したが、本発明は、前記実施例に限定されるものではなく、透明基板の上に駆動ＩＣを実装したＣＯＧ技術以外であるポリシリコンにより駆動回路を透明基板に配設した技術やＣＯＧとＴＡＢ、ＴＣＰを組合わせた技術にも本発明を用いることで本発明と同様な効果を得ることができる。
このような本発明は少なくとも一面に透明電極を形成した第１透明基板と第２透明基板の液晶駆動用の透明電極面を相対向させ間隙を設けて配置し、周辺をシール部材でシールし、該シール部材の内部に液晶を封入してなる液晶表示装置において、前記第２透明基板の延出部に接続する駆動ＩＣとフレキシブル配線板とを並列に配置し透明基板上の配線電極と接続したことを特徴とする液晶表示装置でもある。また、少なくとも一面に透明電極を形成した第１透明基板と第２透明基板の液晶駆動用の透明電極面を相対向させ間隙を設けて配置し、周辺をシール部材でシールし、該シール部材の内部に液晶を封入してなる液晶表示装置において、前記第１透明基板の透明電極配線は透明基板端部近傍から導通部材を介して第２透明基板上に電極配線が延長されており、前記第２透明基板の延出部に配設し第２透明基板上の電極配線と接続する駆動ＩＣが前記導通部材側に配設し、また液晶表示装置と外部回路とを接続するフレキシブル配線基板が前記駆動ＩＣを挟んで前記導通部材側と反対側に配設したことを特徴とする液晶表示装置でもある。また、前記フレキシブル配線基板の液晶側端部が前記駆動ＩＣの液晶側端部より液晶側に突出して配設されていることを特徴として有する。また、前記フレキシブル配線基板の液晶側端部が前記駆動ＩＣの幅の間に配設したことを特徴として有する。また、前記フレキシブル配線基板の液晶側端部が前記駆動ＩＣの前記液晶側端部と反対側の端部と、前記第２透明基板端部との間に配設したことを特徴として有する。また、前記第２透明基板の延出部に接続するフレキシブル配線板は、第２透明基板の透明電極面に対して異方性導電接着剤を介して電気的且つ機械的に接続したことを特徴として有する。
【００２２】
【発明の効果】
以上説明したように、本発明による液晶表示装置は、第２透明基板の延出部に接続する駆動ＩＣとフレキシブル配線板とを並列に配置し接続したことにより、延出部の寸法は従来の延出部の寸法よりも小さく設定でき、液晶表示装置の縦方向の寸法は、従来の縦方向の寸法に対して短縮できるため、液晶表示装置の小型化に寄与することができる。
【００２３】
また、第２透明基板の延出部に接続する駆動ＩＣは、トランスファー側に配設すると共に、第２透明基板の延出部の巾方向中央部に対して前記トランスファー側とは反対方向にフレキシブル配線板を配設したことにより、従来駆動ＩＣが占めていたスペースを相互に並列に分け合い有効に利用できるようになり、端子電極の配線距離を短縮でき、或いは圧着面積を拡大できるため接着強度を向上でき、さらに、フレキシブル配線板の加熱圧着において駆動ＩＣを熱の影響から保護することができる。
【００２４】
さらに、第２透明基板の延出部に接続するフレキシブル配線板は、第２透明基板の透明電極面に対して異方性導電接着剤を介して電気的且つ機械的に接続したことにより、少ない接着代Ｌ２で電気的に短距離で接続され且つ機械的に強力に接着できる効果が得られる。このため、信頼性が向上すると共にダミー電極を廃止でき、コストの低減を図ることができる。
【００２５】
さらに、図５から図７に示したように、第２透明基板上の配線電極及び駆動ＩＣの配置及び第１透明基板の配置によりフレキシブル配線基板の接着位置を適切に取ることで、必要な接着強度が得られ小型な液晶表示装置が得られる効果を有する。
【図面の簡単な説明】
【図１】本発明に係る液晶表示装置の主要部で、駆動ＩＣとフレキシブル配線板が配置された液晶表示装置の斜視図である。
【図２】図１に用いられた液晶表示装置のＡ−Ａ線で切断した場合の断面図である。
【図３】図１に用いられた液晶表示装置のＢ−Ｂ断面図で、端子電極にフレキシブル配線板が異方性導電接着剤を介して接続された状態の断面を示している。
【図４】図３の円で囲まれた部分の拡大図である。
【図５】本発明の第１の実施例に係る液晶表示装置における駆動ＩＣとフレキシブル配線板の位置関係を示した平面図である。
【図６】本発明の第２の実施例に係る液晶表示装置における駆動ＩＣとフレキシブル配線板の位置関係を示した平面図である。
【図７】本発明の第３の実施例に係る液晶表示装置における駆動ＩＣとフレキシブル配線板の位置関係を示した平面図である。
【図８】従来技術の駆動ＩＣとフレキシブル配線板を接続した液晶表示装置の斜視図である。
【図９】従来技術の液晶表示装置の図６におけるＣ−Ｃ断面図である。
【図１０】従来技術の液晶表示装置における駆動ＩＣとフレキシブル配線板の位置関係を示した平面図である。
【符号の説明】
１ 液晶表示装置
１０ フレキシブル回路基板
５０ 第１透明基板
５４ 第１電極
６０ トランスファー
６３ 異方性導電接着剤
７０ 第２透明基板
７２ 延出部
７４ 第２電極
７８ 端子電極
８０ 駆動ＩＣ
８２ シール材
８４ 液晶[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device used in a liquid crystal display monitor such as a mobile phone or a PHS.
[0002]
[Prior art]
In a conventional liquid crystal display device, a method of connecting a liquid crystal display panel and an external circuit board that controls and drives the liquid crystal display panel by an external circuit using a flexible wiring board has been conventionally used. Hereinafter, conventional techniques will be described with reference to the drawings. FIG. 8 is a perspective view of a liquid crystal display device in which a conventional flexible wiring board and a liquid crystal display panel are connected, and FIG. 9 is a cross-sectional view taken along the line CC in FIG. 8 and 9, in the liquid crystal display device 100, a first electrode 54, which is a linear electrode, is arranged in parallel on a transparent substrate made of a transparent film or transparent glass, and further on the upper surface of the first electrode 54. An alignment film (not shown) is formed to form the first transparent substrate 50. A second electrode 74, which is a linear electrode, is disposed in parallel on a substrate made of a transparent film or transparent glass, and an alignment film (not shown) is formed on the second electrode 74 to form a second electrode. The first electrode 54 disposed on the first transparent substrate 50 and the second electrode 74 disposed on the second transparent substrate 70 are orthogonally opposed to each other. The first transparent substrate 50 and the second transparent substrate 70 are arranged with a gap, a seal 82 is provided around the gap, and a liquid crystal 84 is sealed in the gap inside the seal 82. ing. In addition, a transfer 60 is provided to connect the first electrode 54 disposed parallel to the upper surface of the first transparent substrate 50 to the second electrode 74 disposed on the second transparent substrate 70. .
[0003]
On the other hand, an extension part 72 is provided on one side of the second transparent substrate 70, and a driving IC 80, which is an IC for driving liquid crystal, is mounted on the extension part 72. A terminal electrode 78 for external connection is disposed, and the terminal electrode 78 has a configuration in which a flexible wiring board 110 for connection to an external circuit is connected.
FIG. 10 is a plan view showing the positional relationship between the driving IC and the flexible wiring board in the liquid crystal display device.
[0004]
[Problems to be solved by the invention]
The positional relationship between the conventional driving IC and the flexible wiring board is substantially the center in the width direction as shown in FIGS. 8 and 10, and the flexible wiring board 110 is in a serial positional relationship with respect to the driving IC 80. Was arranged to be. In order to maintain the pressure-bonding strength of the flexible wiring board 110, it is necessary to secure a bonding margin L12 for the extended portion 72 of the second transparent substrate 70 of at least about 2 m / m as shown in FIG. It was. For this reason, the dimension L13 of the extension part 72 becomes long, the dimension L1 of the vertical direction of the liquid crystal display device 100 also becomes long, and there exists a problem that a liquid crystal display device will enlarge.
[0005]
In addition, since the area of the bonding allowance L12 cannot be set wide, there is a possibility that both ends of the flexible wiring board 110 may be peeled off because the adhesive strength of the flexible wiring board 110 is weak, resulting in lack of reliability. In order to reinforce this, a dummy electrode 90 as shown in FIG. 10 may be provided at both ends of the flexible wiring board 110, which causes an increase in cost.
The present invention has been made in view of the above circumstances, and provides a liquid crystal display device capable of reducing the size of the liquid crystal display device, improving the adhesive strength, improving the reliability, and reducing the cost. Objective.
[0006]
[Means for Solving the Problems]
The first means of the present invention for solving the above problem is that a first substrate having a first electrode made up of a plurality of linear electrodes and a second substrate having a second electrode made up of a plurality of linear electrodes A flexible wiring board connected to an extended portion of a second substrate extending from a substrate end of the first substrate of a panel in which the electrodes are arranged to cross each other and liquid crystal is sealed between the substrates; In a connection configuration of a panel substrate having a configuration in which two ICs are disposed and a flexible wiring board, the first substrate on the first substrate is provided by a conductive member disposed on a side of the substrate end of the first substrate. An electrode is connected to the wiring electrode of the first electrode on the second substrate, and the IC is arranged close to the conducting member of the extending portion, and the wiring from the IC to the first electrode is shortened. On the side of the IC opposite to the conducting member is the second substrate of the IC. A substrate of a panel, wherein a terminal electrode is disposed on the extending portion between a side of a plate end and a substrate end of the first substrate, and at least a tip of the flexible substrate is connected to the terminal electrode. And a flexible wiring board.
[0007]
A second means of the present invention for solving the above-mentioned problems is the panel according to the first means of the present invention, wherein the width of the extending portion is substantially the same as the width of the first substrate. This is a connection configuration of the substrate and the flexible wiring board.
[0008]
According to a third means of the present invention for solving the above-mentioned problem, in the first or second means of the present invention, the tip of the flexible substrate on the extension portion is a substrate of the second substrate of the IC. It is a connection structure of the board | substrate of a panel, and the flexible wiring board arrange | positioned on the said extension part between the edge | side edge | side and the edge | side of the said 1st board | substrate side of the said IC .
[0009]
A fourth means of the present invention for solving the above-mentioned problems is that the panel is a liquid crystal panel in any one of the first to third means of the present invention, and the substrate of the panel and the flexible wiring board This is a connection configuration.
[0010]
A fifth means of the present invention for solving the above problem is a liquid crystal display device using the connection structure of the panel substrate and the flexible wiring board in any one of the first to fourth means of the present invention.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 to 7 are views showing an embodiment of the present invention. FIG. 1 is a perspective view of a liquid crystal display device in which a driving IC and a flexible wiring board are arranged, which is a main part of the liquid crystal display device according to the present invention. Show. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. 1. The flexible wiring board 10 is anisotropically bonded to the terminal electrode 78 of the extension portion 72. The cross section of the state connected through the agent 63 is shown. FIG. 4 is an enlarged view of a portion surrounded by a circle in FIG. FIG. 5 is a plan view showing the positional relationship between the driving IC 80 and the flexible wiring board 10 in the liquid crystal display device 1 according to the first embodiment of the present invention. FIG. 6 is a plan view showing the positional relationship between the driving IC 80 and the flexible wiring board 10 in the liquid crystal display device 1 according to the second embodiment of the present invention. FIG. 7 is a plan view showing the positional relationship between the driving IC 80 and the flexible wiring board 10 in the liquid crystal display device 1 according to the third embodiment of the present invention.
Hereinafter, embodiments of the liquid crystal display device according to the present invention will be described with reference to the drawings. Since the basic configuration of the liquid crystal display device 1 is the same as that of the conventional example, the same parts as those of the prior art are the same as those of the prior art. The same number is used for explanation.
[0013]
In FIG. 1, the liquid crystal display device 1 has a first electrode 54, which is a linear electrode, arranged in parallel on a transparent substrate made of a transparent film or transparent glass as shown in FIG. 5, FIG. 6, or FIG. Further, as shown in FIG. 2, an alignment film (not shown) is formed on the upper surface of the first electrode 54 to form the first transparent substrate 50. Further, a second electrode 74 which is a linear electrode shown in FIG. 5 is arranged in parallel on a substrate made of a transparent film or transparent glass, and the alignment film shown in FIG. And a second electrode 74 disposed on the second transparent substrate 70 and a second electrode 74 disposed on the second transparent substrate 70. As shown in FIG. 5, the first transparent substrate 50 and the second transparent substrate 70 are disposed with a gap so that they are orthogonally opposed to each other, and a seal 82 is disposed around the gap. A configuration in which liquid crystal (not shown) is sealed is formed in the inner gap. Further, as shown in FIG. 2, in order to connect the first electrode 54 disposed parallel to the upper surface of the first transparent substrate 50 to the drive IC 80 disposed on the second transparent substrate 70, the first transparent substrate 50 A transfer 60 that is a conductive member is provided between the second transparent substrate 70 and the second transparent substrate 70.
[0014]
Further, an extension part 72 is provided on one side of the second transparent substrate 70, and a driving IC 80 that is an IC for driving liquid crystal is mounted on the extension part 72, and a terminal electrode 78 for external connection. Is arranged.
The flexible wiring board 10 has the structure shown in FIG. 3, and electrically conducts the wiring board electrode 88 formed on one side of the flexible wiring board 10 with respect to the terminal electrode 78 formed on the upper surface of the extending portion 72. Are connected via the adhesive 63.
[0015]
In the liquid crystal display device according to the present invention having the above-described configuration, the driving IC 80 connected to the extending portion 72 of the second transparent substrate 70 and the flexible wiring board 10 are arranged in parallel as shown in FIGS. Thus, the distal end portion of the flexible wiring board 10 is arranged so as to be substantially horizontally aligned with the drive IC 80.
As a result, as shown in FIG. 5, even if the bonding margin L2 of the flexible wiring board 10 with respect to the extending portion 72 of the second transparent substrate 70 is set to 2 m / m or more within the allowable range, the dimension of the extending portion 72 is maintained. L3 can be set smaller than the dimension L13 (FIG. 10) of the conventional extending portion 72 shown in FIG. 10, and the vertical dimension L of the liquid crystal display device 1 is smaller than the conventional vertical dimension L1 (FIG. 10). Can be shortened.
Furthermore, the driving IC 80 connected to the extending portion 72 of the second transparent substrate 70 is disposed on one side of the second transparent substrate 70 where the transfer 60 located on one side in the width direction is disposed, and the second The flexible wiring board 10 is disposed in a direction opposite to the transfer 60 side with respect to the central portion in the width direction of the extending portion 72 of the transparent substrate 70. Therefore, the space occupied by the conventional driving IC 80 is shared in parallel with each other and can be used effectively.
[0016]
Furthermore, the flexible wiring board 10 connected to the extending portion 72 of the second transparent substrate 70 is electrically and mechanically connected to the transparent electrode surface of the second transparent substrate 70 via an anisotropic conductive adhesive 63. Connected to. As a result, as shown in FIG. 4, when the conductive particles D are pressed by the heating head from the upper surface of the flexible wiring board 10, the conductive particles D extend between the wiring board electrode 88 of the flexible wiring board 10 and the second transparent substrate 70. The portion sandwiched between the terminal electrodes 78 provided in the protruding portion 72 becomes the conductive particles D1, and becomes conductive in the vertical direction. However, in the portion not sandwiched between the wiring board electrode 88 and the terminal electrode 78, the nonconductive state is maintained in the longitudinal direction in the state of the conductive particles D2. For this reason, it can be electrically connected in a short distance with a small bonding margin L2 and can be mechanically strongly bonded, and a reliable effect can be obtained. Alternatively, a stronger adhesive force can be obtained by increasing the bonding margin L2 to the display screen side edge of the drive IC 80.
[0017]
In addition, as shown in FIG. 6, when the gap between the driving IC 80 and the first transparent substrate 50 is large, the liquid crystal side end of the flexible wiring board 10 is arranged to protrude from the liquid crystal side end of the driving IC 80 to the liquid crystal side. By providing, sufficient adhesive strength of the flexible wiring board 10 can be obtained.
[0018]
Further, as shown in FIG. 5, when the gap between the driving IC 80 and the first transparent substrate 50 is narrow and the distance between the driving IC 80 and the end of the second transparent substrate 70 is narrow, the liquid crystal of the flexible wiring board 10 is used. Adhesive strength of the flexible wiring board 10 can be sufficiently obtained by disposing the side end portion between the widths of the driving IC 80.
[0019]
Further, as shown in FIG. 7, when the distance between the driving IC 80 and the end of the second transparent substrate 70 is wide,
Since the liquid crystal side end of the flexible wiring substrate 10 is disposed between the end of the driving IC 80 opposite to the liquid crystal side and the end of the second transparent substrate 70, the adhesive strength of the flexible wiring substrate 10 is increased. can get.
[0020]
As described above, as shown in FIGS. 5 to 7, the bonding position of the flexible wiring substrate 10 can be appropriately taken by the arrangement of the wiring electrodes and the driving IC 80 on the second transparent substrate 70 and the arrangement of the first transparent substrate 50. Thus, the required adhesive strength can be obtained and a small liquid crystal display device can be obtained.
[0021]
As described above, the embodiment according to the present invention has been specifically described. However, the present invention is not limited to the above-described embodiment, and is not a COG technology other than the COG technology in which the driving IC is mounted on the transparent substrate. The same effect as the present invention can be obtained by using the present invention for the technique in which the drive circuit is arranged on a transparent substrate using silicon and the technique in which COG, TAB, and TCP are combined.
In the present invention, the transparent electrode surface for driving the liquid crystal of the first transparent substrate and the second transparent substrate on which at least one surface is formed with a transparent electrode face each other with a gap, and the periphery is sealed with a seal member, In the liquid crystal display device in which liquid crystal is sealed inside the seal member, a driving IC connected to the extending portion of the second transparent substrate and a flexible wiring board are arranged in parallel and connected to wiring electrodes on the transparent substrate. It is also a liquid crystal display device characterized by this. In addition, the transparent electrode surface for driving the liquid crystal of the first transparent substrate and the second transparent substrate on which at least one surface is formed with a transparent electrode are opposed to each other and provided with a gap, and the periphery is sealed with a sealing member. In the liquid crystal display device in which liquid crystal is sealed inside, the transparent electrode wiring of the first transparent substrate is extended from the vicinity of the transparent substrate end portion onto the second transparent substrate through a conductive member, A driving IC disposed on the extending portion of the transparent substrate and connected to the electrode wiring on the second transparent substrate is disposed on the conductive member side, and a flexible wiring substrate connecting the liquid crystal display device and the external circuit is disposed on the conductive member side. It is also a liquid crystal display device characterized in that it is disposed on the side opposite to the conducting member side with the drive IC interposed therebetween. Further, the liquid crystal side end portion of the flexible wiring board is disposed so as to protrude from the liquid crystal side end portion of the driving IC toward the liquid crystal side. Further, the liquid crystal side end portion of the flexible wiring board is disposed between the widths of the drive ICs. Further, the liquid crystal side end portion of the flexible wiring board is disposed between the end portion of the drive IC opposite to the liquid crystal side end portion and the second transparent substrate end portion. The flexible wiring board connected to the extending portion of the second transparent substrate is electrically and mechanically connected to the transparent electrode surface of the second transparent substrate via an anisotropic conductive adhesive. Have as.
[0022]
【The invention's effect】
As described above, in the liquid crystal display device according to the present invention, the driving IC connected to the extending portion of the second transparent substrate and the flexible wiring board are arranged and connected in parallel, so that the dimension of the extending portion is the conventional one. Since the dimension of the liquid crystal display device can be set smaller than the dimension of the extending portion and the vertical dimension of the liquid crystal display device can be shortened with respect to the conventional vertical dimension, the liquid crystal display device can be reduced in size.
[0023]
The driving IC connected to the extending portion of the second transparent substrate is disposed on the transfer side and is flexible in the direction opposite to the transfer side with respect to the central portion in the width direction of the extending portion of the second transparent substrate. By arranging the wiring board, the space occupied by the drive IC in the past can be shared and used effectively, and the wiring distance of the terminal electrode can be shortened, or the crimping area can be expanded, thus increasing the adhesive strength. Further, the driving IC can be protected from the influence of heat in the thermocompression bonding of the flexible wiring board.
[0024]
Furthermore, there are few flexible wiring boards connected to the extension part of a 2nd transparent substrate by having electrically and mechanically connected to the transparent electrode surface of the 2nd transparent substrate via the anisotropic conductive adhesive. It is possible to obtain an effect of being electrically connected at a short distance at the bonding allowance L2 and capable of being mechanically strongly bonded. For this reason, the reliability can be improved, the dummy electrode can be eliminated, and the cost can be reduced.
[0025]
Furthermore, as shown in FIG. 5 to FIG. 7, the necessary adhesion can be achieved by appropriately arranging the bonding position of the flexible wiring board by the arrangement of the wiring electrode and the driving IC on the second transparent board and the arrangement of the first transparent board. There is an effect that strength can be obtained and a small liquid crystal display device can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a liquid crystal display device in which a driving IC and a flexible wiring board are arranged in a main part of the liquid crystal display device according to the present invention.
2 is a cross-sectional view of the liquid crystal display device used in FIG. 1 taken along line AA.
3 is a cross-sectional view taken along the line BB of the liquid crystal display device used in FIG. 1, showing a cross section in a state where a flexible wiring board is connected to a terminal electrode through an anisotropic conductive adhesive.
4 is an enlarged view of a portion surrounded by a circle in FIG. 3;
FIG. 5 is a plan view showing a positional relationship between a driving IC and a flexible wiring board in the liquid crystal display device according to the first embodiment of the present invention.
FIG. 6 is a plan view showing a positional relationship between a driving IC and a flexible wiring board in a liquid crystal display device according to a second embodiment of the present invention.
FIG. 7 is a plan view showing a positional relationship between a driving IC and a flexible wiring board in a liquid crystal display device according to a third embodiment of the present invention.
FIG. 8 is a perspective view of a liquid crystal display device in which a conventional driving IC and a flexible wiring board are connected.
9 is a cross-sectional view taken along the line CC in FIG. 6 of a conventional liquid crystal display device.
FIG. 10 is a plan view showing a positional relationship between a driving IC and a flexible wiring board in a liquid crystal display device according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 10 Flexible circuit board 50 1st transparent substrate 54 1st electrode 60 Transfer 63 Anisotropic conductive adhesive 70 2nd transparent substrate 72 Extension part 74 2nd electrode 78 Terminal electrode 80 Drive IC
82 Sealant 84 LCD

Claims (5)

複数の線状の電極よりなる第１電極を有する第１基板と
複数の線状の電極よりなる第２電極を有する第２基板が
前記電極を交差する如く対向して配設し前記基板の間に液晶を封止したパネルの
第１基板の基板端から延出した第２基板の延出部に接続されるフレキシブル配線板と１つのＩＣが配設された構成を有するパネルの基板とフレキシブル配線板の接続構成において、
前記第１基板の前記基板端の側方に配設された導通部材で
前記第１基板上の前記第１電極と前記第２基板の上の前記第１電極の配線電極とが接続され
前記延出部の前記導通部材に寄せて前記ＩＣを配設し前記ＩＣから前記第１電極への配線を短くし
前記導通部材と反対側の前記ＩＣの側方には
前記ＩＣの前記第２基板の基板端側の辺と前記第１基板の基板端との間の前記延出部上に端子電極を配設し
この端子電極に前記フレキシブル基板の少なくとも先端を接続したことを特徴とするパネルの基板とフレキシブル配線板の接続構成。A first substrate having a first electrode made up of a plurality of linear electrodes and a second substrate having a second electrode made up of a plurality of linear electrodes are arranged opposite each other so as to cross the electrodes, and between the substrates A panel substrate and a flexible wiring having a configuration in which a flexible wiring board connected to an extending portion of a second substrate extending from the substrate end of the first substrate of the panel sealed with liquid crystal and one IC are arranged In the board connection configuration,
The first electrode on the first substrate and the wiring electrode of the first electrode on the second substrate are connected by the conductive member disposed on the side of the substrate end of the first substrate and the extension is performed. The IC is arranged close to the conducting member of the protruding portion, the wiring from the IC to the first electrode is shortened, and the side of the IC opposite to the conducting member is on the side of the second substrate of the IC. A substrate of a panel, wherein a terminal electrode is disposed on the extending portion between a substrate end side and a substrate end of the first substrate, and at least a tip of the flexible substrate is connected to the terminal electrode. And flexible wiring board connection configuration. 前記延出部の幅が前記第１基板の幅とほぼ同じであることを特徴とする請求項１に記載のパネルの基板とフレキシブル配線板の接続構成。  The connection configuration of the substrate of the panel and the flexible wiring board according to claim 1, wherein a width of the extending portion is substantially the same as a width of the first substrate. 前記延出部上の前記フレキシブル基板の先端が、前記ＩＣの前記第２基板の基板端側の辺と前記ＩＣの前記第１基板側の辺との間の前記延出部上に配設されたことを特徴とする請求項１または２に記載のパネルの基板とフレキシブル配線板の接続構成。  The tip of the flexible substrate on the extension portion is disposed on the extension portion between the side of the IC on the substrate end side of the second substrate and the side of the IC on the first substrate side. The connection structure of the board | substrate of the panel and flexible wiring board of Claim 1 or 2 characterized by the above-mentioned. 前記パネルが液晶パネルであることを特徴とする請求項１乃至３のいずれか一に記載のパネルの基板とフレキシブル配線板の接続構成。  The said panel is a liquid crystal panel, The connection structure of the board | substrate of a panel and flexible wiring board as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned. 請求項１乃至４のいずれかの一におけるパネルの基板とフレキシブル配線板の接続構成を用いた液晶表示装置。  A liquid crystal display device using a connection structure of a panel substrate and a flexible wiring board according to claim 1.
JP10910397A 1997-04-25 1997-04-25 Connection structure of panel substrate and flexible wiring board, and liquid crystal display device using the same Expired - Fee Related JP3954152B2 (en)

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JP2002139739A (en) * 2000-11-01 2002-05-17 Rohm Co Ltd Liquid crystal display device and method for manufacturing semiconductor chip used for the same
JP2002132222A (en) * 2000-10-23 2002-05-09 Rohm Co Ltd Structure of liquid crystal display device
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