JP3747458B2

JP3747458B2 - Display device

Info

Publication number: JP3747458B2
Application number: JP2001075360A
Authority: JP
Inventors: 直路正司
Original assignee: Nippon Seiki Co Ltd
Current assignee: Nippon Seiki Co Ltd
Priority date: 2001-01-31
Filing date: 2001-03-16
Publication date: 2006-02-22
Anticipated expiration: 2021-03-16
Also published as: JP2002304131A

Description

【０００１】
【発明の属する技術分野】
本発明は、各種機器に搭載される表示装置に関し、特に光源を通じてバックライト照明される表示素子を備えた表示装置に係わる。
【０００２】
【従来の技術】
従来より、表示素子として例えば液晶パネルを用いた表示装置が広く知られている。かかる表示装置の多くは、ライトボックスと称されるケースを通じて表示素子が回路基板上に支持され、回路基板に装着した光源にて表示素子がバックライト照明される。また表示素子と回路基板とは、表示素子に設けられた電極端子と回路基板に設けられた回路パターンとが適宜接続部材にて導通接続され、回路基板を通じて表示素子に駆動信号を供給し、表示素子に所定の表示を行わせるようになっている。
【０００３】
表示素子と回路基板の接続部材としては、例えば特開平１０−１７７１５５号公報に示されているように複数のリードフレームを使用するものや、例えば特開平１１−３０５２０２号公報に示されているようにラバーコネクタ（導電ゴム）を使用するものがある。これらのものは電極端子のピッチ間隔が比較的広い場合や電極端子数の少ない場合は実用的であるが、例えば高解像度が要求される表示素子のように、電極端子数が多くそのピッチ間隔が狭い場合には不向きである。また例えば実開平５−４７９２０号公報に示されているように可撓性回路基板（ＦＰＣまたはフレキシブル回路基板）を用いたものも知られており、可撓性回路基板を用いたものは、電極端子間が極小ピッチの場合でも接続が容易であり、表示素子の小型化や高解像化にも対応し得るというメリットがある。
【０００４】
【発明が解決しようとする課題】
しかしながら、前記実開平５−４７９２０号公報に代表される可撓性回路基板を使用したものは、可撓性回路基板と回路基板（硬質回路基板）との接続部が表示素子を支持するケースの外部側方に位置するため、ケースの外側に位置する回路基板上に接続スペースが必要となり、その分、回路基板が大型化し、コスト上昇につながる。またケースの外部側方に接続スペースが必要となることで回路基板を含む装置全体が大型化するという問題がある。また例えば組み付け作業に伴って可撓性回路基板と回路基板との接続部に機械的ストレス等の過度な応力が加わることがある。
【０００５】
本発明は、この点に鑑みてなされたもので、その主な目的は、回路基板上のスペースを節約して小型化あるいはコスト低減を達成し得ることに加え、接続信頼性を向上させることが可能な表示装置を提供するものである。
【０００６】
【課題を解決するための手段】
本発明は、前記目的を達成するため、表示素子と、この表示素子と導通接続される回路基板と、この回路基板上に前記表示素子を支持するケースと、前記表示素子と前記回路基板とを導通接続する可撓性回路基板とを備え、前記ケースと前記回路基板との間に前記可撓性回路基板と前記回路基板との接続部を設け、前記ケースに前記可撓性回路基板を前記回路基板に位置規制する規制部を形成し、前記規制部が少なくとも前記可撓性回路基板を前記回路基板の基板面に沿わせる第１の規制部と、前記回路基板の基板面に対する前記可撓性回路基板の板面方向移動を規制する第２の規制部とからなることを特徴とする。
【０００７】
また本発明は、前記回路基板上に前記表示素子を照明する光源が設けられ、前記ケースが前記光源に対応する第１の開口部と、前記表示素子に対応する第２の開口部と、これら第１，第２の開口部間に位置し前記光源からの光を前記表示素子側に反射する反射壁とを有し、この反射壁の外壁面と前記回路基板との間に前記接続部を設けたことを特徴とする。
【０００８】
また本発明は、前記接続部が前記可撓性回路基板と前記回路基板とを所定の導電性物質を介して接合することにより形成されることを特徴とする。
【０００９】
また本発明は、前記接続部が前記可撓性回路基板と前記回路基板とをコネクタを介して接続することにより形成されることを特徴とする。
【００１２】
また本発明は、前記規制部の近傍にヒンジ部が形成され、このヒンジ部を基点として前記ケースを回転装着可能に設けたことを特徴とする。
【００１３】
また本発明は、少なくとも前記ヒンジ部とは反対側となるケース位置に、前記回路基板に係合するフック部を設けたことを特徴とする。
【００１４】
また本発明は、前記可撓性回路基板が前記ケースの一側部を経由して前記回路基板側に延びており、前記ケースの一側部側に前記回路基板に係合する引っ掛け部が形成され、この引っ掛け部を基点として前記ケースを回転装着可能に設けたことを特徴とする。
【００１５】
また本発明は、少なくとも前記引っ掛け部とは反対側となるケース位置に、前記回路基板に係合するフック部を設けたことを特徴とする。
【００１６】
【発明の実施の形態】
本発明による表示装置は、例えば液晶パネルからなる受光型の表示素子と、この表示素子を背後から照明する例えば発光ダイオードからなる光源と、この光源を保持すると共に表示素子と導通接続される例えばガラスエポキシ系材料からなる硬質の回路基板と、この回路基板上に表示素子を支持する合成樹脂からなるケースと、表示素子と回路基板とを導通接続する可撓性回路基板とを備えており、ケースと回路基板との間に可撓性回路基板と回路基板との接続部が設けられている。このように接続部をケースの背後に設けることにより回路基板上のスペースを節約してスペース効率を高めることができ、回路基板を小型化し、コスト上昇を抑えることができる。また回路基板上のスペース効率を高めることで、装置全体の大型化を抑え、小型化を達成することができる。なお接続部は、少なくともその一部がケースと回路基板との間（表示素子の視認方向平面視においてケース外形の回路基板上投影範囲内）に位置していればよいが、ケースと回路基板との間に収まる接続部領域が多い程、省スペース化に有利であり、理想的には接続部全体をケースまたは表示素子と回路基板との間に位置させるとよい。また表示素子としては液晶パネルのように受光型の表示素子の他、例えばＥＬパネルや蛍光表示管（ＶＦＤ）等の自発光型の表示素子を適用することもでき、このように自発光型の表示素子を用いる場合、光源が不要であることは言うまでもない。
【００１７】
またケースが光源に対応する第１の開口部と、表示素子に対応する第２の開口部と、これら第１，第２の開口部間に位置し光源からの光を表示素子側に反射する反射壁とを有する場合、この反射壁の外壁面と回路基板との間に接続部を設けることにより、反射壁の外壁面とこれに対応する回路基板の基板面との余剰スペースにて可撓性回路基板と回路基板とを接続でき、スペース効率を高める上で大きなメリットを有する。すなわち光源からの光を表示素子側に反射する反射壁は、通常、第１の開口部の周囲から第２の開口部に向けて傾斜または湾曲傾斜して延び、その内壁面は、表示素子を照明するための照明室を形成するが、反射壁の外壁面はこれに対応する回路基板の基板面との間で照明には関与しない余剰スペースを形成するもので、この余剰スペースに接続部を位置させることで、回路基板上スペースを節約できれば、スペース効率上のメリットが大きい。
【００１８】
また可撓性回路基板と回路基板との接続に際しては、所定の導電性物質、例えば半田、異方性導電膜、ＵＶ硬化型導電膜を介して両者を接合することにより接続部を形成してもよいし、両者をコネクタ等の専用接続具を介して接続することにより接続部を形成してもよい。
【００１９】
またケースに可撓性回路基板を回路基板に位置規制する規制部を形成すると、過度な応力が接続部に加わるのを抑制し、接続信頼性を高めることができる。このような位置決め部としては、可撓性回路基板を回路基板側の基板面に沿わせる第１の規制部と、回路基板の基板面に対する可撓性回路基板の板面方向移動を規制する第２の規制部とで形成すると、第１の規制部により可撓性回路基板の回路基板からの浮き上がりを抑制し、浮き上がりに伴って接続部に加わる応力の発生を予防または応力自体を軽減できると共に、第２の規制部により可撓性回路基板の板面方向移動を抑制し、板面方向移動に伴って接続部に加わる応力の発生を予防または応力自体を軽減でき、接続信頼性を高める上で有利である。
【００２０】
またケースを例えば合成樹脂から設ける場合、規制部の近傍に薄肉のヒンジ部を設け、このヒンジ部を基点としてケースを回転装着可能に設けることにより、ケースに表示素子及び可撓性回路基板を保持した状態で回路基板に組み付けることができ、組み付け作業性を向上させることができ、しかも組み付け時において、接続部に剥離方向の応力を加わりにくくでき、接続部の破損を予防することができる。またこの場合、少なくともヒンジ部とは反対側となるケース位置に、回路基板に係合するフック部を設け、ヒンジ部を基点としたケースの回転に応じて、フック部が回路基板に係合するよう構成すると、組み付けが更に容易となり、生産効率を高めることができる。
【００２１】
また可撓性回路基板がケースの一側部を経由して回路基板側に引き回される場合、ケースの一側部側に回路基板に係合する引っ掛け部を設け、この引っ掛け部を基点としてケースを回転装着可能に設けてもよく、このように構成することで、ケースに表示素子及び可撓性回路基板を保持した状態で回路基板に組み付けることができ、組み付け作業性を向上させることができ、しかも組み付け時において、接続部に剥離方向の応力を加わりにくくでき、接続部の破損を予防することができる。またこの場合、少なくとも引っ掛け部とは反対側となるケース位置に、回路基板に係合するフック部を設け、引っ掛け部を基点としたケースの回転に応じて、フック部が回路基板に係合するよう構成すると、組み付けが更に容易となり、生産効率を高めることができる。
【００２２】
【実施例】
以下、本発明の実施例を添付図面を用いて説明する。図１は本発明の第１の実施例による表示装置の正面図、図２は図１のＡ−Ａ線に沿った断面図、図３は図１のＢ−Ｂ線に沿った断面図、図４は図１のＣ−Ｃ線に沿った断面図、図５は接続部を図２中、矢印Ｄ方向から見た場合の要部正面図、図６は図３の矢印Ｅ領域の拡大断面図、図７は同上実施例における表示装置の組み付けを説明する要部分解断面図である。
【００２３】
図１〜図４において表示装置は、表示素子１と、この表示素子１を背後から照明する光源２と、この光源２を保持すると共に表示素子１と導通接続される回路基板３と、この回路基板３上に表示素子１を支持するケース４と、表示素子１と回路基板３とを導通接続する可撓性回路基板５とで構成されている。
【００２４】
表示素子１は、例えば一対のガラス基板間に液晶分子を封入した液晶パネルからなり、その端部には可撓性回路基板５と導通接続される複数の電極端子１１（特に図１参照）を備えている。
【００２５】
光源２は複数個の発光ダイオードからなり、ケース４の内部で表示素子１の長手方向に沿うように略等間隔で一列に配置されている（図４参照）。
【００２６】
回路基板３は、ガラスエポキシ系材料からなる硬質の回路基板で、その所定箇所には可撓性回路基板５を介して各電極端子１１に導通接続され、表示素子１に駆動信号を供給する複数の回路パターン３１（図５参照）を有している。
【００２７】
ケース４は、例えば白色系の合成樹脂にて略箱形に形成され、表示素子１を取り巻く周壁４０と、表示素子１を支持する受壁４１と、光源に対応する第１の開口部４２と、表示素子１に対応する第２の開口部４３と、これら開口部４２，４３間に位置する反射壁４４とを有している。
【００２８】
周壁４０には、回路基板３側に延長し、先端部に回路基板３に係合する係合部が設けられたフック部４０１（図４参照）が形成され、このフック部４０１が回路基板３に係合することによりケース４を回路基板３に装着できるようになっている。また周壁４０には、図１に示すように表示素子１の一対の角部前方側を保持する保持部４０２と、これら保持部４０２の反対側に位置して表示素子１の前方側に係合する係合フック部４０３とが形成され、表示素子１の一辺側角部を保持部４０２の背後に挿入した後に表示素子１を受部４１側に押圧することにより表示素子１の他方側一辺が係合フック部４０３に係合し、これにより受部４１に表示素子１を載置した状態でケース３に支持するようにしている。
【００２９】
受壁４１には、可撓性回路基板５に沿って外側に延長する延長壁４１１が形成され、この延長壁４１１の先端部に可撓性回路基板５と当接する突条部４１１ａ（図２、図３参照）が形成され、この突条部４１１ａに可撓性回路基板５を当接させつつ回路基板３側に迂回させる構成となっている。この突条部４１１ａは、可撓性回路基板５を迂回させて引き回す際の基点部となるもので、その頂部の突出寸法は、この部分を介して引き回される可撓性回路基板５部分と、後述する導通接続部（可撓性回路基板５と表示素子１の電極端子１１との接続部分）を形成する可撓性回路基板５部分とが略同じ高さになるように設定されており、これにより前記導通接続部に過度な応力が加わることを防止している。また可撓性回路基板５の引き回し側となる受壁４１部分には、回路基板３に向けて延長する一対の延長部４１２が延長壁４１１を挟むように、互いに間隔を空けて形成されている。これら延長部４１２の端部側には、回路基板３の板面に沿って延長する壁部（第１の規制部）４１３が形成され、この壁部４１３は、可撓性回路基板５を回路基板５側に押圧してその板面に沿わせることにより、可撓性回路基板５の浮き上がり方向（例えば図３中、垂直方向）移動を規制するものである。この壁部４１３には、回路基板３側に突出し、可撓性回路基板５と回路基板３の双方に形成される後述する各孔部に挿通される突出部（第２の規制部）４１４が形成され、この突出部４１４は、回路基板３の板面に対する可撓性回路基板５の板面方向（例えば図３中、水平方向）移動を規制するもので、壁部４１３と併せて突出部４１４を採用することで、可撓性回路基板５を図３中、垂直方向並びに水平方向に位置規制する規制部を構成している。
【００３０】
反射壁４４は、第１の開口部４２の周囲から第２の開口部４３に向けて次第に末広がり状に傾斜して延び、受壁４１に連続している。そして、その内壁面により光源からの光を表示素子１に反射する照明室を形成しており、一方、反射壁４４の外壁面は、これに対応する回路基板３の基板面との間で、照明には関与しない余剰部（余剰スペース）Ｓを形成している。
【００３１】
可撓性回路基板５は、ＦＰＣ、ヒートシールフィルム、平型導電性フィルム等と称されるもので、図１，図２及び図５に示すように、表示素子１の電極端子１１及び回路基板３の回路パターン３１に対応する複数の導電路５１を有し、表示素子１側の端部５２がその電極端子１１に導通接続され、これにより導通接続部６が形成されると共に、回路基板３側の端部５３がその回路パターン３１に導通接続され、これにより接続部７が形成される。また端部５３には、図５に示すように導電路５１の列を挟むように孔部５４が形成され、この孔部５４と、この孔部５４に対応して回路基板３位置に形成された孔部３２（図６参照）との双方にケース４の突出部４１４を挿入することにより、端部５３が回路基板３に対して位置規制されるようになっている。
なお可撓性回路基板５は、図示しない合成樹脂からなるベースフィルム上に複数本の導電路５１を形成すると共に導電路５１が形成された前記ベースフィルム上に同じく合成樹脂からなる保護フィルムを接合してなり、表示素子１の電極端子１１に導通接続される箇所及び回路基板３の回路パターン３１に導通接続される箇所は、前記保護フィルムが除去されて導電路５１が露出しており、前記保護フィルムから露出した導電路５１が電極端子１１と回路パターン３１の双方に接続されるものである。
【００３２】
端部５３と回路基板３（回路パターン３１）との接続は、予め回路パターン３１の所要部分に半田層（導電性物質）を形成した回路基板３上に、可撓性回路基板５の端部５３を当接させて導電路５１を回路パターン３１に位置合わせし、可撓性回路基板５上から熱を加えることで前記半田層を溶融させて回路パターン３１と導電路５１とを半田付けし、これにより両者の所要部（図２中、括弧にて示す領域Ｆまたは図５中、一点鎖線で示す領域Ｆ参照）に半田接合による接続部７が形成される。なお導通接続部６も接続部７と同様、適宜導電性物質（例えばＵＶ硬化型導電膜）を介して導電路５１と電極端子１１を接続することにより形成されている。
【００３３】
この際、接続部７は、図２に示すように、ケース４と回路基板３との間（表示素子１の平面視においてケース４外形の回路基板３上投影範囲内）、すなわちケース４の反射壁４４と回路基板３とで形成される余剰部Ｓ内に位置する回路基板３の板面箇所に位置している。
【００３４】
以下、図７に基づいて本実施例による表示装置の組み付けについて説明する。まず、予め端部５２が表示素子１の電極端子１１に導通接続された可撓性回路基板５のもう一方の端部５３（導電路５１）を、回路基板３（回路パターン３１）に前述の通り半田付けする。この際、両者の半田付けは、各孔部５４，３２に図示しない位置決め治具を挿入することにより端部５３（導電部５１）と回路基板３（回路パターン３１）とを位置合わせした状態で行われ、半田付け完了後に前記位置決め治具が除去される。
次に端部５３の前方より回路基板３上にケース４を配置し、フック部４０１（図４参照）を通じて回路基板３にケース４を装着する。この際、端部５３はケース４の壁部４１３により回路基板３側に押圧されて浮き上がりが抑制されると共に、ケースの突出部４１４が各孔部５４，３２に挿入されることにより、板面方向への移動が規制され、これにより接続部７に対して応力が加わりにくい構造となる。
【００３５】
次に保持部４０２と係合フック部４０３（図１参照）とを通じて表示素子１をケース４に装着し、組み付けが完了する。
【００３６】
以上のように本実施例では、液晶パネルからなる表示素子１と、この表示素子１を背後から照明する光源２と、この光源２を保持すると共に表示素子１と導通接続される回路基板３と、この回路基板３上に表示素子１を支持するケース４と、表示素子１と回路基板３とを導通接続する可撓性回路基板５とを備えており、ケース４と回路基板３との間に可撓性回路基板５と回路基板３との接続部７を設けたことにより、回路基板３上のスペースを節約してスペース効率を高めることができ、これにより回路基板３を小型化し、コスト上昇を抑えることができる。また回路基板３上のスペース効率を高めることで、装置全体の大型化を抑え、小型化を達成することができる。
【００３７】
また本実施例では、ケース４が光源２に対応する第１の開口部４２と、表示素子２に対応する第２の開口部４３と、これら第１，第２の開口部４２，４３間に位置し光源２からの光を表示素子１側に反射する反射壁４４を有し、この反射壁４４の外壁面と回路基板３との間の余剰部Ｓで可撓性回路基板５と回路基板３とを接続することにより、余剰部Ｓを利用してスペース効率を高めることができ、大きなメリットを得ることができる。
【００３８】
また本実施例では、壁部（第１の規制部）４１３と突出部（第２の規制部）４１４とで可撓性回路基板５の端部５３を位置規制したことにより、例えば組み付け作業に伴う機械的ストレス等の応力が接続部７に加わるのを抑制でき、接続信頼性を高めることができる。また本実施例では第１の規制部（壁部４１３）と第２の規制部（突出部４１４）とを延長部４１２を通じて集中的に設けたが、第１の規制部（壁部４１３）と第２の規制部（突出部４１４）とは、ケース４の適所に分散配置もしくは分離配置することも可能である。
【００３９】
図８は本発明の第２の実施例を示す断面図であり、本実施例では可撓性回路基板５の端部５３を回路基板３に設けたコネクタ８を介して接続し、接続部７を設けたものであり、かかる実施例によっても前記第１の実施例と同様、スペース効率を高めることができる。
【００４０】
図９，図１０は本発明の第３の実施例を示すもので、図９はケース装着前の要部断面図、図１０はケース装着後の断面図であり、本実施例では、規制部を構成する壁部４１３と突出部４１４の近傍となる延長部４１２に部分的に薄肉となるヒンジ部Ｈを設け、このヒンジ部Ｈを基点としてケース４を回転装着する例を示している。すなわち、図９に示すように、予め表示素子１と可撓性回路基板５とを保持したケース４を、回路基板３上に縦置きし、ケースの壁部４１３と突出部４１４とで可撓性回路基板５の端部５３を回路基板３に位置規制した状態で、可撓性回路基板５の端部５３を回路基板３に半田付けして接続部７を設け、その後、薄肉ヒンジＨを基点としてケース４を回転させ、図１０に示すようにケース４を回路基板３に装着したものであり、かかる構成により、前記第１，第２の実施例と同様の効果を期待できる他、ケース４に表示素子１及び可撓性回路基板５を保持した状態で回路基板３に組み付けることができ、組み付け作業性を向上させることができる。しかも前記第１の実施例と比較した場合、その組み付け時において、接続部７に剥離方向（回路基板３と可撓性回路基板５との重ね方向）の応力が加わるのを抑制でき、接続部７の破損を予防することができる。
【００４１】
また本実施例では、図示しないが、少なくともヒンジ部Ｈとは反対側となるケース４位置に、前記第１の実施例と同様なフック部（４０１）を設け、ヒンジ部Ｈを基点としたケース４の回転に応じて、フック部が回路基板３に係合するよう構成してもよく、このように構成することで、組み付けが更に容易となり、生産効率を高めることができる。
【００４２】
図１１〜図１４は、本発明の第４の実施例を示すもので、図１１は、本発明の第４の実施例による表示装置の正面図、図１２は図１１のＧ−Ｇ線に沿った断面図、図１３及び図１４は、同上実施例における表示装置の組み付けを示す概略図である。
【００４３】
本実施例による表示装置は、前記第１〜第３の実施例と同様、可撓性回路基板５がケース４の一側部を経由して回路基板３側に引き回されており、ケース４の一側部側であって、可撓性回路基板５を挟むようにその両側に位置する側壁部４０４の回路基板３側端部には、回路基板３に係合する略「Ｌ」字状または「鍵」状の引っ掛け部４０５が形成され、またケース４の一側部とは反対側となる側壁部４０４であって、その回路基板３側端部には、弾性を有するフック部４０１が形成されている。
【００４４】
そして、図１３に示すように、予め表示素子１と可撓性回路基板５とを保持したケース４を、表示素子１が回路基板３と対面するように反対向きにし、この状態で可撓性回路基板５の端部５３を回路基板３に半田付けして接続部７を設け、その後、図１４に示すように、ケース４の引っ掛け部４０５を回路基板３に引っ掛けて、引っ掛け部４０５を基点としてケース４を回転させると、突出部４１４が回路基板３の孔部３２に嵌合して可撓性回路基板５が位置規制され、さらにケース４を回転させると、フック部４０１が回路基板３に係合し、組み付けが完了するものである。
【００４５】
これにより、前記第３の実施例と同様、ケース４に表示素子１及び可撓性回路基板５を保持した状態で回路基板３に組み付けることができ、組み付け作業性を向上させることができ、しかも組み付け時において、接続部７に剥離方向（回路基板３と可撓性回路基板５との重ね方向）の応力が働くのを抑制でき、接続部７の破損を予防することができる。また本例においても、少なくとも引っ掛け部４０５とは反対側となるケース４位置に、回路基板３に係合するフック部４０１を設け、引っ掛け部４０５を基点としたケース４の回転に応じて、フック部４０１が回路基板３に係合するよう構成したことにより、組み付けが更に容易となり、生産効率を高めることができる。
【００４６】
なお前記第３，第４の実施例では、フック部（４０１）をケース４の一側部とは反対側となる側壁部（４０４）に設けたが、この部分以外にも形成することができる。
【００４７】
【発明の効果】
以上詳述したように本発明は、表示素子と、この表示素子と導通接続される回路基板と、この回路基板上に前記表示素子を支持するケースと、前記表示素子と前記回路基板とを導通接続する可撓性回路基板とを備え、前記ケースと前記回路基板との間に前記可撓性回路基板と前記回路基板との接続部を設け、前記ケースに前記可撓性回路基板を前記回路基板に位置規制する規制部を形成し、前記規制部が少なくとも前記可撓性回路基板を前記回路基板の基板面に沿わせる第１の規制部と、前記回路基板の基板面に対する前記可撓性回路基板の板面方向移動を規制する第２の規制部とからなることにより、回路基板上のスペースを節約して小型化あるいはコスト低減を達成し得ることに加え、接続信頼性を向上させることが可能な表示装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施例による表示装置の正面図。
【図２】図１のＡ−Ａ線に沿った断面図。
【図３】図１のＢ−Ｂ線に沿った断面図。
【図４】図１のＣ−Ｃ線に沿った断面図。
【図５】接続部を図２中、矢印Ｄ方向から見た場合の要部正面図。
【図６】図３の矢印Ｅ領域の拡大断面図。
【図７】同上実施例における表示装置の組み付けを説明する分解断面図。
【図８】本発明の第２の実施例を示す断面図。
【図９】本発明の第３の実施例による表示装置のケース装着前の要部断面図。
【図１０】同上実施例における表示装置のケース装着後の断面図。
【図１１】本発明の第４の実施例による表示装置の正面図。
【図１２】図１１のＧ−Ｇ線に沿った断面図。
【図１３】同上実施例における表示装置の組み付けを示す概略図。
【図１４】同上実施例における表示装置の組み付けを示す概略図。
【符号の説明】
１表示素子
２光源
３回路基板
４ケース
５可撓性回路基板
６導通接続部
７接続部
８コネクタ
１１電極端子
３１回路パターン
３２，５４孔部
４０周壁
４１受壁
４２第１の開口部
４３第２の開口部
４４反射壁
５１導電路
５２，５３端部
４０１フック部
４０２保持部
４０３係合フック部
４０４側壁部
４０５引っ掛け部
４１１延長壁
４１１ａ突条部
４１２延長部
４１３壁部（第１の規制部）
４１４突出部（第２の規制部）
Ｓ余剰部（余剰スペース）
Ｈヒンジ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device mounted on various devices, and more particularly to a display device including a display element that is backlit by a light source.
[0002]
[Prior art]
Conventionally, display devices using, for example, a liquid crystal panel as a display element are widely known. In many of such display devices, a display element is supported on a circuit board through a case called a light box, and the display element is backlit by a light source mounted on the circuit board. In addition, the display element and the circuit board are electrically connected to electrode terminals provided on the display element and a circuit pattern provided on the circuit board by a connecting member as appropriate, and supply a drive signal to the display element through the circuit board to display the display element and the circuit board. A predetermined display is performed on the element.
[0003]
As a connection member between the display element and the circuit board, for example, as shown in Japanese Patent Laid-Open No. 10-177155, a plurality of lead frames are used, and as shown in Japanese Patent Laid-Open No. 11-305202, for example. Some use rubber connectors (conductive rubber). These are practical when the pitch interval between the electrode terminals is relatively wide or when the number of electrode terminals is small, but for example, a display element that requires high resolution has a large number of electrode terminals and the pitch interval is large. Not suitable for narrow cases. Further, for example, as shown in Japanese Utility Model Laid-Open No. 5-47920, one using a flexible circuit board (FPC or flexible circuit board) is also known, and one using a flexible circuit board is an electrode. Even when the terminals have a very small pitch, the connection is easy, and there is an advantage that the display element can be reduced in size and resolution.
[0004]
[Problems to be solved by the invention]
  However, in the case of using a flexible circuit board typified by Japanese Utility Model Laid-Open No. 5-47920, the connection portion between the flexible circuit board and the circuit board (hard circuit board) supports the display element. Since it is located on the outer side, a connection space is required on the circuit board located outside the case, and accordingly, the circuit board becomes larger and costs increase. In addition, since a connection space is required on the outside of the case, there is a problem that the entire apparatus including the circuit board is enlarged.In addition, for example, excessive stress such as mechanical stress may be applied to the connection portion between the flexible circuit board and the circuit board during the assembling work.
[0005]
  The present invention has been made in view of this point, and the main object of the present invention is to save space on the circuit board and achieve miniaturization or cost reduction.In addition, connection reliability can be improvedA display device is provided.
[0006]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides a display element, a circuit board electrically connected to the display element, a case for supporting the display element on the circuit board, the display element and the circuit board. A flexible circuit board that is conductively connected, and a connection portion between the flexible circuit board and the circuit board is provided between the case and the circuit board.A first restricting portion that forms a restricting portion for restricting the position of the flexible circuit board on the circuit board in the case, and the restricting portion causes at least the flexible circuit board to run along a substrate surface of the circuit board. And a second restricting portion for restricting movement of the flexible circuit board in the plate surface direction with respect to the board surface of the circuit board.It is characterized by that.
[0007]
According to the present invention, a light source that illuminates the display element is provided on the circuit board, and the case has a first opening corresponding to the light source, a second opening corresponding to the display element, and these A reflection wall that is positioned between the first and second openings and reflects light from the light source toward the display element, and the connection portion is provided between the outer wall surface of the reflection wall and the circuit board. It is provided.
[0008]
Further, the present invention is characterized in that the connection portion is formed by joining the flexible circuit board and the circuit board via a predetermined conductive material.
[0009]
Further, the present invention is characterized in that the connecting portion is formed by connecting the flexible circuit board and the circuit board via a connector.
[0012]
Further, the present invention is characterized in that a hinge portion is formed in the vicinity of the restricting portion, and the case is rotatably provided with the hinge portion as a base point.
[0013]
Further, the present invention is characterized in that a hook portion that engages with the circuit board is provided at least in a case position opposite to the hinge portion.
[0014]
According to the present invention, the flexible circuit board extends to the circuit board side via one side of the case, and a hook portion that engages with the circuit board is formed on one side of the case. The case is provided so that the case can be rotatably mounted with the hook portion as a base point.
[0015]
Further, the present invention is characterized in that a hook portion that engages with the circuit board is provided at least in a case position opposite to the hook portion.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A display device according to the present invention includes, for example, a light-receiving display element formed of a liquid crystal panel, a light source formed of, for example, a light-emitting diode that illuminates the display element from the back, and glass, for example, that holds the light source and is electrically connected to the display element A case comprising: a hard circuit board made of an epoxy-based material; a case made of synthetic resin that supports the display element on the circuit board; and a flexible circuit board that electrically connects the display element and the circuit board. A connection portion between the flexible circuit board and the circuit board is provided between the circuit board and the circuit board. Thus, by providing the connection part behind the case, the space on the circuit board can be saved and the space efficiency can be improved, the circuit board can be downsized, and the cost increase can be suppressed. Further, by increasing the space efficiency on the circuit board, it is possible to suppress an increase in the size of the entire apparatus and achieve a reduction in size. Note that at least a part of the connecting portion may be located between the case and the circuit board (within the projection range on the circuit board of the case outer shape in a plan view of the display element). The larger the connection area between the two, the more advantageous the space saving. Ideally, the entire connection area should be positioned between the case or the display element and the circuit board. In addition to a light receiving display element such as a liquid crystal panel, a self-luminous display element such as an EL panel or a fluorescent display tube (VFD) can also be applied as the display element. Needless to say, when a display element is used, a light source is unnecessary.
[0017]
The case is located between the first opening corresponding to the light source, the second opening corresponding to the display element, and the first and second openings, and reflects light from the light source toward the display element. In the case of having a reflection wall, by providing a connection portion between the outer wall surface of the reflection wall and the circuit board, the extra space between the outer wall surface of the reflection wall and the corresponding substrate surface of the circuit board can be flexibly provided. The circuit board can be connected to the circuit board, which has a great merit in improving the space efficiency. That is, the reflection wall that reflects light from the light source to the display element side usually extends from the periphery of the first opening portion to the second opening portion so as to be inclined or curved, and its inner wall surface An illumination room for illuminating is formed, but the outer wall surface of the reflecting wall forms a surplus space that does not participate in illumination with the corresponding substrate surface of the circuit board, and a connecting portion is provided in this surplus space. If the space on the circuit board can be saved by positioning, there is a great advantage in space efficiency.
[0018]
Further, when connecting the flexible circuit board and the circuit board, a connecting portion is formed by bonding the two through a predetermined conductive material, for example, solder, anisotropic conductive film, UV curable conductive film. Alternatively, the connecting portion may be formed by connecting the two via a dedicated connector such as a connector.
[0019]
Further, if a restricting portion for restricting the position of the flexible circuit board on the circuit board is formed in the case, it is possible to suppress an excessive stress from being applied to the connecting portion and to improve the connection reliability. As such a positioning portion, a first restricting portion that causes the flexible circuit board to run along the substrate surface on the circuit board side, and a first restricting portion that moves the flexible circuit board relative to the substrate surface of the circuit board. When formed with the two restricting portions, the first restricting portion suppresses the floating of the flexible circuit board from the circuit board, and prevents the stress applied to the connecting portion due to the lifting or reduces the stress itself. The second restricting portion suppresses the movement of the flexible circuit board in the plate surface direction, prevents the stress applied to the connection portion along with the movement in the plate surface direction or reduces the stress itself, and improves the connection reliability. Is advantageous.
[0020]
When the case is made of, for example, synthetic resin, a thin hinge portion is provided in the vicinity of the restricting portion, and the case can be rotatably mounted with the hinge portion as a base, thereby holding the display element and the flexible circuit board in the case. In this state, it can be assembled to the circuit board, and the assembling workability can be improved. Moreover, it is difficult to apply the stress in the peeling direction to the connecting portion at the time of assembling, and damage to the connecting portion can be prevented. Further, in this case, a hook portion that engages with the circuit board is provided at least on the case position opposite to the hinge portion, and the hook portion engages with the circuit board according to the rotation of the case with the hinge portion as a base point. If comprised in this way, an assembly | attachment becomes still easier and production efficiency can be improved.
[0021]
In addition, when the flexible circuit board is routed to the circuit board side via one side portion of the case, a hook portion that engages with the circuit board is provided on one side portion of the case, and the hook portion serves as a base point. The case may be provided so as to be rotationally mountable. By configuring in this way, the display element and the flexible circuit board can be assembled to the circuit board while being held in the case, which improves the assembling workability. In addition, during assembly, it is difficult to apply a stress in the peeling direction to the connecting portion, and damage to the connecting portion can be prevented. Further, in this case, a hook portion that engages with the circuit board is provided at least on the case position opposite to the hook portion, and the hook portion engages with the circuit board according to the rotation of the case with the hook portion as a base point. If comprised in this way, an assembly | attachment becomes still easier and production efficiency can be improved.
[0022]
【Example】
Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a front view of a display device according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. 4 is a cross-sectional view taken along the line C-C in FIG. 1, FIG. 5 is a front view of the main part when the connecting portion is viewed from the direction of arrow D in FIG. 2, and FIG. Sectional drawing and FIG. 7 are principal part exploded sectional drawings explaining the assembly | attachment of the display apparatus in an Example same as the above.
[0023]
1 to 4, the display device includes a display element 1, a light source 2 that illuminates the display element 1 from behind, a circuit board 3 that holds the light source 2 and is electrically connected to the display element 1, and this circuit. A case 4 for supporting the display element 1 on the substrate 3 and a flexible circuit board 5 for electrically connecting the display element 1 and the circuit board 3 are configured.
[0024]
The display element 1 is composed of, for example, a liquid crystal panel in which liquid crystal molecules are sealed between a pair of glass substrates, and a plurality of electrode terminals 11 (particularly refer to FIG. 1) electrically connected to the flexible circuit board 5 are provided at the ends thereof. I have.
[0025]
The light source 2 is composed of a plurality of light emitting diodes, and is arranged in a line at substantially equal intervals along the longitudinal direction of the display element 1 inside the case 4 (see FIG. 4).
[0026]
The circuit board 3 is a hard circuit board made of a glass epoxy material, and is electrically connected to each electrode terminal 11 via a flexible circuit board 5 at a predetermined location, and supplies a driving signal to the display element 1. Circuit pattern 31 (see FIG. 5).
[0027]
The case 4 is formed in, for example, a white box-shaped synthetic resin in a substantially box shape, and includes a peripheral wall 40 that surrounds the display element 1, a receiving wall 41 that supports the display element 1, and a first opening 42 that corresponds to the light source. The second opening 43 corresponding to the display element 1 and the reflection wall 44 positioned between the openings 42 and 43 are provided.
[0028]
The peripheral wall 40 is formed with a hook portion 401 (see FIG. 4) that extends toward the circuit board 3 and has an engaging portion that engages with the circuit board 3 at the tip. The case 4 can be mounted on the circuit board 3 by engaging with the circuit board 3. Further, as shown in FIG. 1, the peripheral wall 40 has a holding part 402 that holds the front side of the pair of corners of the display element 1, and is positioned on the opposite side of the holding part 402 and engages with the front side of the display element 1. And the other side of the display element 1 is pressed by pressing the display element 1 toward the receiving part 41 side after inserting one side corner of the display element 1 behind the holding part 402. By engaging with the engaging hook portion 403, the display element 1 is placed on the receiving portion 41 and supported by the case 3.
[0029]
An extension wall 411 extending outward along the flexible circuit board 5 is formed on the receiving wall 41, and a protrusion 411 a (see FIG. 2) that contacts the flexible circuit board 5 at the tip of the extension wall 411. 3 is formed, and the flexible circuit board 5 is brought into contact with the protruding portion 411a and detoured toward the circuit board 3 side. The protrusion 411a serves as a base point when the flexible circuit board 5 is detoured and routed, and the projecting dimension of the top is the flexible circuit board 5 part routed through this part. And the flexible circuit board 5 forming a conductive connection part (a connection part between the flexible circuit board 5 and the electrode terminal 11 of the display element 1), which will be described later, are set to have substantially the same height. Thus, an excessive stress is prevented from being applied to the conductive connection portion. Further, a pair of extension portions 412 extending toward the circuit board 3 are formed on the receiving wall 41 portion on the drawing side of the flexible circuit board 5 so as to be spaced from each other so as to sandwich the extension wall 411. . Wall portions (first restricting portions) 413 extending along the plate surface of the circuit board 3 are formed on the end portions of the extension portions 412, and the wall portions 413 connect the flexible circuit board 5 to the circuit. The movement of the flexible circuit board 5 in the lifting direction (for example, the vertical direction in FIG. 3) is restricted by pressing the board 5 along the plate surface. The wall portion 413 has a protruding portion (second restricting portion) 414 that protrudes toward the circuit board 3 and is inserted into each hole portion described later formed in both the flexible circuit board 5 and the circuit board 3. The protrusions 414 are formed to restrict movement of the flexible circuit board 5 in the plate surface direction (for example, the horizontal direction in FIG. 3) relative to the plate surface of the circuit board 3. By adopting 414, a restricting portion for restricting the position of the flexible circuit board 5 in the vertical direction and the horizontal direction in FIG. 3 is configured.
[0030]
The reflection wall 44 extends from the periphery of the first opening 42 to the second opening 43 so as to be gradually inclined toward the second opening 43, and continues to the receiving wall 41. And the illumination wall which reflects the light from a light source on the display element 1 is formed with the inner wall surface, On the other hand, the outer wall surface of the reflection wall 44 is between the board | substrate surfaces of the circuit board 3 corresponding to this, A surplus portion (surplus space) S that is not involved in illumination is formed.
[0031]
The flexible circuit board 5 is called an FPC, a heat seal film, a flat conductive film, or the like. As shown in FIGS. 1, 2, and 5, the electrode terminal 11 and the circuit board of the display element 1 are used. 3 has a plurality of conductive paths 51 corresponding to the circuit pattern 31, the end 52 on the display element 1 side is conductively connected to the electrode terminal 11, thereby forming the conductive connection 6, and the circuit board 3. The end 53 on the side is conductively connected to the circuit pattern 31, thereby forming the connection portion 7. Further, as shown in FIG. 5, holes 54 are formed in the end 53 so as to sandwich the row of the conductive paths 51, and the holes 54 are formed at positions on the circuit board 3 corresponding to the holes 54. By inserting the protruding portion 414 of the case 4 into both the hole portion 32 (see FIG. 6), the position of the end portion 53 is regulated with respect to the circuit board 3.
The flexible circuit board 5 has a plurality of conductive paths 51 formed on a base film made of synthetic resin (not shown), and a protective film made of synthetic resin is also bonded to the base film on which the conductive paths 51 are formed. The portion that is conductively connected to the electrode terminal 11 of the display element 1 and the portion that is conductively connected to the circuit pattern 31 of the circuit board 3 are such that the protective film is removed and the conductive path 51 is exposed, The conductive path 51 exposed from the protective film is connected to both the electrode terminal 11 and the circuit pattern 31.
[0032]
The end 53 and the circuit board 3 (circuit pattern 31) are connected to the end of the flexible circuit board 5 on the circuit board 3 in which a solder layer (conductive material) is formed in a required portion of the circuit pattern 31 in advance. 53, the conductive path 51 is aligned with the circuit pattern 31, and heat is applied from above the flexible circuit board 5 to melt the solder layer and solder the circuit pattern 31 and the conductive path 51. As a result, a connecting portion 7 is formed by solder bonding in a required portion of both (see a region F indicated by parentheses in FIG. 2 or a region F indicated by a dashed line in FIG. 5). Similarly to the connection portion 7, the conductive connection portion 6 is formed by appropriately connecting the conductive path 51 and the electrode terminal 11 via a conductive material (for example, a UV curable conductive film).
[0033]
At this time, as shown in FIG. 2, the connecting portion 7 is between the case 4 and the circuit board 3 (within the projection range on the circuit board 3 of the outer shape of the case 4 in the plan view of the display element 1), that is, the reflection of the case 4 The circuit board 3 is located on the plate surface portion located in the surplus portion S formed by the wall 44 and the circuit board 3.
[0034]
Hereinafter, the assembly of the display device according to the present embodiment will be described with reference to FIG. First, the other end 53 (conductive path 51) of the flexible circuit board 5 in which the end 52 is electrically connected in advance to the electrode terminal 11 of the display element 1 is connected to the circuit board 3 (circuit pattern 31) as described above. Solder. At this time, the soldering of both is performed in a state in which the end portion 53 (conductive portion 51) and the circuit board 3 (circuit pattern 31) are aligned by inserting a positioning jig (not shown) into each of the holes 54 and 32. The positioning jig is removed after the soldering is completed.
Next, the case 4 is arranged on the circuit board 3 from the front of the end portion 53, and the case 4 is attached to the circuit board 3 through the hook portion 401 (see FIG. 4). At this time, the end portion 53 is pressed to the circuit board 3 side by the wall portion 413 of the case 4 to suppress the lifting, and the protruding portion 414 of the case is inserted into each of the holes 54 and 32, thereby The movement in the direction is restricted, so that a stress is hardly applied to the connection portion 7.
[0035]
Next, the display element 1 is attached to the case 4 through the holding portion 402 and the engagement hook portion 403 (see FIG. 1), and the assembly is completed.
[0036]
As described above, in this embodiment, the display element 1 composed of a liquid crystal panel, the light source 2 that illuminates the display element 1 from the back, and the circuit board 3 that holds the light source 2 and is electrically connected to the display element 1. A case 4 for supporting the display element 1 on the circuit board 3 and a flexible circuit board 5 for electrically connecting the display element 1 and the circuit board 3 to each other. By providing the connection portion 7 between the flexible circuit board 5 and the circuit board 3, the space on the circuit board 3 can be saved and the space efficiency can be improved, thereby reducing the size of the circuit board 3 and reducing the cost. The rise can be suppressed. Further, by increasing the space efficiency on the circuit board 3, it is possible to suppress an increase in the size of the entire apparatus and achieve a reduction in size.
[0037]
In this embodiment, the case 4 has a first opening 42 corresponding to the light source 2, a second opening 43 corresponding to the display element 2, and the first and second openings 42, 43. The flexible circuit board 5 and the circuit board are provided at a surplus portion S between the outer wall surface of the reflection wall 44 and the circuit board 3 and having a reflection wall 44 that is positioned and reflects the light from the light source 2 to the display element 1 side. By connecting to 3, space efficiency can be improved using the surplus part S, and a big merit can be acquired.
[0038]
  Further, in this embodiment, the position of the end portion 53 of the flexible circuit board 5 is regulated by the wall portion (first regulating portion) 413 and the projecting portion (second regulating portion) 414. It is possible to suppress the accompanying stress such as mechanical stress from being applied to the connection portion 7 and to improve connection reliability.. MaIn this embodiment, the first restricting portion (wall portion 413) and the second restricting portion (projecting portion 414) are intensively provided through the extension portion 412, but the first restricting portion (wall portion 413) and The second restricting portion (protruding portion 414) can be dispersedly arranged or separated from the case 4 at appropriate positions.
[0039]
FIG. 8 is a cross-sectional view showing a second embodiment of the present invention. In this embodiment, the end portion 53 of the flexible circuit board 5 is connected via a connector 8 provided on the circuit board 3, and the connection section 7 is connected. According to this embodiment, the space efficiency can be improved as in the first embodiment.
[0040]
FIGS. 9 and 10 show a third embodiment of the present invention. FIG. 9 is a cross-sectional view of the main part before mounting the case, and FIG. 10 is a cross-sectional view after mounting the case. In this example, a hinge portion H that is partially thin is provided on the extension portion 412 that is in the vicinity of the wall portion 413 and the projecting portion 414 constituting the case 4, and the case 4 is rotationally mounted using the hinge portion H as a base point. That is, as shown in FIG. 9, the case 4 holding the display element 1 and the flexible circuit board 5 in advance is placed vertically on the circuit board 3, and the case wall 413 and the protrusion 414 are flexible. In a state in which the end portion 53 of the circuit board 5 is restricted to the circuit board 3, the end portion 53 of the flexible circuit board 5 is soldered to the circuit board 3 to provide the connection portion 7. The case 4 is rotated as a base point, and the case 4 is mounted on the circuit board 3 as shown in FIG. 10. With this configuration, the same effects as in the first and second embodiments can be expected. 4, the display element 1 and the flexible circuit board 5 can be assembled to the circuit board 3 while being held, and the assembling workability can be improved. Moreover, when compared with the first embodiment, it is possible to suppress the stress in the peeling direction (the overlapping direction of the circuit board 3 and the flexible circuit board 5) from being applied to the connection portion 7 during the assembly. 7 damage can be prevented.
[0041]
Further, in this embodiment, although not shown in the drawings, a case where the same hook portion (401) as that in the first embodiment is provided at least in the case 4 position opposite to the hinge portion H and the hinge portion H is used as a base point. The hook portion may be configured to engage with the circuit board 3 in accordance with the rotation of the circuit board 4. With this configuration, the assembly is further facilitated and the production efficiency can be increased.
[0042]
FIGS. 11 to 14 show a fourth embodiment of the present invention, FIG. 11 is a front view of a display device according to the fourth embodiment of the present invention, and FIG. 12 is taken along line GG in FIG. FIG. 13 and FIG. 14 are schematic views showing the assembly of the display device according to the same embodiment.
[0043]
In the display device according to this embodiment, the flexible circuit board 5 is routed to the circuit board 3 side via one side of the case 4 as in the first to third embodiments. Of the side wall portion 404 located on both sides of the flexible circuit board 5 so as to sandwich the flexible circuit board 5. Alternatively, a “key” -shaped hook portion 405 is formed, and the side wall portion 404 is opposite to one side portion of the case 4, and a hook portion 401 having elasticity is formed at an end portion on the side of the circuit board 3. Is formed.
[0044]
Then, as shown in FIG. 13, the case 4 holding the display element 1 and the flexible circuit board 5 in advance is turned in the opposite direction so that the display element 1 faces the circuit board 3. The end portion 53 of the circuit board 5 is soldered to the circuit board 3 to provide the connection portion 7, and then the hook portion 405 of the case 4 is hooked on the circuit board 3 as shown in FIG. When the case 4 is rotated, the protruding portion 414 is fitted into the hole 32 of the circuit board 3 and the position of the flexible circuit board 5 is restricted. When the case 4 is further rotated, the hook portion 401 is moved to the circuit board 3. To complete the assembly.
[0045]
Thus, as in the third embodiment, the display element 1 and the flexible circuit board 5 are held in the case 4 and can be assembled to the circuit board 3 to improve the assembling workability. At the time of assembly, it is possible to suppress the stress in the peeling direction (the overlapping direction of the circuit board 3 and the flexible circuit board 5) from acting on the connection portion 7, and to prevent the connection portion 7 from being damaged. Also in this example, a hook portion 401 that engages with the circuit board 3 is provided at least on the side of the case 4 opposite to the hook portion 405, and the hook is moved according to the rotation of the case 4 from the hook portion 405. Since the part 401 is configured to be engaged with the circuit board 3, the assembly is further facilitated, and the production efficiency can be increased.
[0046]
In the third and fourth embodiments, the hook portion (401) is provided on the side wall portion (404) opposite to one side portion of the case 4. However, the hook portion (401) may be formed on other portions. .
[0047]
【The invention's effect】
  As described above in detail, the present invention provides a display element, a circuit board electrically connected to the display element, a case for supporting the display element on the circuit board, and the display element and the circuit board. A flexible circuit board to be connected, and a connecting portion between the flexible circuit board and the circuit board is provided between the case and the circuit board.A first restricting portion that forms a restricting portion for restricting the position of the flexible circuit board on the circuit board in the case, and the restricting portion causes at least the flexible circuit board to run along a substrate surface of the circuit board. And a second restricting portion for restricting movement of the flexible circuit board in the plate surface direction with respect to the board surface of the circuit board.Can save space on the circuit board and achieve downsizing or cost reductionIn addition, connection reliability can be improvedA display device can be provided.
[Brief description of the drawings]
FIG. 1 is a front view of a display device according to a first embodiment of the present invention.
2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
4 is a cross-sectional view taken along the line CC of FIG.
5 is a front view of the main part when the connection part is viewed from the direction of arrow D in FIG. 2. FIG.
6 is an enlarged cross-sectional view of a region indicated by an arrow E in FIG.
FIG. 7 is an exploded cross-sectional view for explaining assembly of the display device in the embodiment.
FIG. 8 is a sectional view showing a second embodiment of the present invention.
FIG. 9 is a cross-sectional view of a main part of a display device according to a third embodiment of the present invention before mounting a case.
FIG. 10 is a cross-sectional view of the display device according to the embodiment after the case is mounted.
FIG. 11 is a front view of a display device according to a fourth embodiment of the present invention.
12 is a sectional view taken along line GG in FIG.
FIG. 13 is a schematic view showing assembly of the display device in the embodiment.
FIG. 14 is a schematic diagram showing assembly of the display device in the embodiment.
[Explanation of symbols]
1 Display element
2 Light source
3 Circuit board
4 cases
5 Flexible circuit board
6 Conductive connection
7 connections
8 Connector
11 Electrode terminal
31 Circuit pattern
32, 54 hole
40 wall
41 Receiving wall
42 First opening
43 Second opening
44 Reflecting wall
51 Conductive path
52,53 end
401 hook
402 holding part
403 engagement hook
404 Side wall
405 hook
411 Extension wall
411a ridge
412 Extension
413 Wall (first regulating part)
414 Projection (second regulating part)
S Surplus part (surplus space)
H Hinge part

Claims

A display element;
A circuit board electrically connected to the display element;
A case for supporting the display element on the circuit board;
A flexible circuit board that conductively connects the display element and the circuit board;
A connecting portion between the flexible circuit board and the circuit board is provided between the case and the circuit board ,
Forming a restricting portion for restricting the position of the flexible circuit board on the circuit board in the case;
The restricting portion restricts movement of the flexible circuit board in the plate surface direction relative to the substrate surface of the circuit board, and a first restricting portion that causes at least the flexible circuit board to run along the board surface of the circuit board. A display device comprising two restriction portions .

A light source for illuminating the display element on the circuit board;
A first opening corresponding to the light source of the case;
A second opening corresponding to the display element;
A reflection wall that is positioned between the first and second openings and reflects light from the light source toward the display element; and the connection portion between the outer wall surface of the reflection wall and the circuit board. The display device according to claim 1, further comprising:

3. The display device according to claim 1, wherein the connecting portion is formed by joining the flexible circuit board and the circuit board through a predetermined conductive material.

The display device according to claim 1, wherein the connection portion is formed by connecting the flexible circuit board and the circuit board through a connector.

The display device according to claim 1 , wherein a hinge portion is formed in the vicinity of the restricting portion, and the case is rotatably provided with the hinge portion as a base point.

The display device according to claim 5 , wherein a hook portion that engages with the circuit board is provided at least at a case position opposite to the hinge portion.

The flexible circuit board extends to the circuit board side via one side portion of the case, and a hook portion that engages with the circuit board is formed on one side portion of the case. The display device according to claim 1 , wherein the case is provided so as to be rotationally mountable from the base point.

The display device according to claim 7 , wherein a hook portion that engages with the circuit board is provided at least in a case position opposite to the hook portion.