JP3734952B2

JP3734952B2 - Liquid crystal display

Info

Publication number: JP3734952B2
Application number: JP08310898A
Authority: JP
Inventors: 光明山崎; 秀明永久保; 武順木村; 孝一山本
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 1998-03-30
Filing date: 1998-03-30
Publication date: 2006-01-11
Anticipated expiration: 2018-03-30
Also published as: TW375722B; KR19990078070A; JPH11282360A; KR100297049B1

Description

【０００１】
【発明の属する技術分野】
本発明は、液晶表示装置に係るものであり、特に液晶表示装置を構成する、液晶表示素子を配設するためのケースに設ける緩衝部材に関する。
【０００２】
【従来の技術】
図１１は、従来の液晶表示装置の斜視図、図１２は、従来の液晶表示装置の分解斜視図、図１３は、従来の液晶表示装置の組立を示す説明図である。
合成樹脂の成型品からなり、上部が開放された箱形のケース２１は、底面板２１ａと、底面板２１ａの外周に設けられた４つの側壁２１ｂと、底面板２１ａから上方に突出した凸条部からなる複数の支持部材２１ｃと、側壁２１ｂの外側面下部に設けられた複数個の凹部２１ｄとで構成されている。
【０００３】
液晶材が封入された平板状の液晶表示素子２２は、その下面外周部にシリコン系の弾性を有するゴムからなる緩衝部材２３が接着剤で取り付けられている。また、液晶表示素子２２の外周には、電気部品が搭載されたプリント基板２４が、可撓性を有し液晶表示素子駆動用ＩＣが設けられたプリントフィルム２５により電気的に接続されて取り付けられている。
【０００４】
平板状の導光体２６、細長い棒形状をなしたランプ２７がケース２１内に収納され、また、導光体２６の上方には、プリントフィルム２５によりプリント基板２４が取り付けられた液晶表示素子２２が収納されている。
【０００５】
金属板からなる取付部材２８は、上面板２８ａと、上面板２８ａに形成された開口部２８ｂと、開口部２８ｂの外周近傍で上面板２８ａに突き出し加工により設けられた凸条の押え部２８ｃと、上面板２８ａの外周部を折り曲げて形成された４つの側面板２８ｄと、側面板２８ｄから下方に一体に伸びた複数のＬ字状の腕部２８ｅとで構成されている。開口部２８ｂは、液晶表示素子２２の有効表示領域よりも大きく開口され、また、腕部２８ｅは、側面板２８ｄと連結されて垂直方向に伸びた連結部２８ｆと、水平方向に長く伸びた水平部２８ｇとによりＬ字状に構成されている。
【０００６】
取付部材２８は、図１１に示すように、ケース２１の上方を覆うように被せられ、ケース２１内に収納されたプリント基板２４及びランプ２７が上面板２８ａによって覆い隠されるとともに、取付部材２８の腕部２８ｅの水平部２８ｇが凹部２１ｄの内方へ折り曲げられてケース２１に固定されている。また、導光体２６上部の液晶表示素子２２が、緩衝部材２３が介在された状態で支持部材２１ｃと、押え部２８ｃとにより挟持され、液晶表示素子２２の有効表示領域が開口部２８ｂより露出された状態で取り付けられて、従来の液晶表示装置が構成されている。
【０００７】
従来の液晶表示装置を組み立てるには、ケース２１の上方から取付部材２８を被せ、図１３Ｂ中に矢印で示すように押し付けながら、腕部２８ｅの水平部２８ｇを凹部２１ｄの内方へ折り曲げる。この際、取付部材２８が過剰な力で押し付けられても、緩衝部材２３が上下方向に縮められて力を吸収するため、液晶表示素子２２が破損されるのを防止することができる。
また、従来の液晶表示装置の組立後に、衝撃や静荷重等の外部応力が加えられても、同様に緩衝部材２３が上下方向に縮められて外部応力を吸収し、液晶表示素子２２の破損が防止される。
【０００８】
【発明が解決しようとする課題】
しかしながら、液晶表示素子２２に取り付ける、ゴムからなる緩衝部材２３の材料コストが掛かるとともに、液晶表示装置の製造工程において、液晶表示素子２２に緩衝部材２３を取り付ける工程が増えることとなり、従来の液晶表示装置の製造コストの上昇を招いていた。
【０００９】
また、液晶表示装置内のプリント基板２４上の電子部品等から発生した熱や、支持部材２１ｃと押え部２８ｃとにより挟持される際の圧力が原因となり、従来の液晶表示装置を長時間使用していると、緩衝部材２３が徐々に変形し、液晶表示素子２２の有効表示領域にまで侵出して、表示に不具合を起こす問題が生じていた。
【００１０】
【課題を解決するための手段】
前記課題を解決するための第１の解決手段として、本発明の液晶表示素子は、液晶表示素子と、該液晶表示素子を上下で挟持して取り付けるケースと取付部材とを備え、前記ケース又は前記取付部材と一体に、前記液晶表示素子に当接して、上下方向に移動可能な凸部を有する緩衝部材を設け、前記ケースには側壁、又は前記取付部材には上面板を設け、前記側壁又は前記上面板には、２つの平行なスリット間に位置して上下方向に撓み可能な第１の撓み部を設け、第１の前記緩衝部材を、前記第１の撓み部と、前記第１の撓み部に形成された前記凸部とで構成し、前記側壁又は前記上面板には、前記凸部の近傍に、前記凸部よりも低い、前記液晶表示素子に当接可能な規制突起部を設けた構成とした。
【００１１】
また、第２の解決手段として、本発明の液晶表示素子は、一端が前記側壁、又は前記上面板に連結されて他端が上下方向に撓み可能な片持ち状の第２の撓み部を設け、第２の前記緩衝部材を、前記第２の撓み部と、前記第２の撓み部に形成された前記凸部とで構成してＬ字状に形成し、前記第２の緩衝部材が前記液晶表示素子の角部に当接し、前記第１の緩衝部材が前記液晶表示素子の２つの角部の間に当接する構成とした。
【００１５】
【発明の実施の形態】
以下に、本発明の液晶表示装置の第１の実施の形態について説明する。図１は、本発明の第１の実施の形態の液晶表示装置の斜視図、図２は、本発明の第１の実施の形態の液晶表示装置の分解斜視図、図３は、本発明の第１の実施の形態の液晶表示装置の要部の斜視図である。また、図４及び図５は、本発明の第１の実施の形態の液晶表示装置の要部を拡大した説明図である。また、図６は、本発明の第１の実施の形態の液晶表示装置の要部側面図、図７は、図６の７−７線における要部断面図、図８は、本発明の第１の実施の形態の液晶表示装置の要部側面図であり、同図Ａは図６の８Ａ−８Ａ線における要部断面図であり、同図Ｂは、図８Ａの８Ｂ−８Ｂ線における断面図である。また、図９は、本発明の第１の実施の形態の液晶表示装置に対して外部応力を加えたときの断面図であり、同図Ａは図８Ａにおける断面図、同図Ｂは、図９Ａの９Ｂ−９Ｂ線における断面図である。
【００１６】
耐熱性合成樹脂の成型品からなり、上部が開放された箱形のケース１は、底面板１ａと、底面板１ａの外周に設けられた４つの外側の側壁１ｂと、外側の側壁１ｂの外側面に突出して設けられた複数の爪部１ｃと、爪部１ｃの下方の外側の側壁１ｂに設けられた複数個の凹部１ｄと、外側の側壁１ｂの爪部１ｃの裏側に設けられた空隙部１ｅと、外側の側壁１ｂの外側面に設けられた複数の誘導突起部１ｆと、２つの誘導突起部１ｆの間隙により構成された誘導溝１ｇ、外側の側壁１ｂの外側面に突出して設けられたストッパー１ｈとを有する。
また、ケース１は、底面板１ａの上方に突出して設けられ、側壁上面板１ｉを有する内側の側壁１ｊと、内側の側壁１ｊの側壁上面板１ｉ上の中間部に複数個設けられた第１の緩衝部材１ｋと、内側の側壁１ｊの側壁上面板１ｉ上の端部に複数個設けられた第２の緩衝部材１ｌと、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌの側部近傍の側壁上面板１ｉの上方に突出して設けられた規制突起部１ｍと、内側の側壁１ｊの側壁上面板１ｉに上方に突出して設けられた複数の位置決めボス１ｎとを有して構成されている。
【００１７】
爪部１ｃは、外側の側壁１ｂの外側面に複数個設けられ、外側の側壁１ｂの上部から下部へ行くに従って、外側の側壁１ｂの外側面からの突出高さが漸次大きくなるように形成されている。また、爪部１ｃの下面は、底面板１ａと略平行になるように設けられている。また、凹部１ｄは、図７に示すように、外側の側壁１ｂの底面板１ａと連結している内側面下部の厚肉とされた部分に設けられている。また、空隙部１ｅは、爪部１ｃが設けられている外側の側壁１ｂの裏側の厚肉部を除して設けられている。また、誘導突起部１ｆは、外側の側壁１ｂの外側面が厚肉とされ、外側面から突出して複数個設けられている。また、誘導溝１ｇは、２つの誘導突起部１ｆの、底面板１ａと垂直、且つ対向した２つの面が形成する間隙により構成されている。この誘導溝１ｇは、少なくとも相対向する２つの外側の側壁１ｂに設けられる。また、ストッパー１ｈは、外側の側壁１ｂの外側面の下部が厚肉とされ、外側面に突出して複数個設けられ、その上面は底面板１ａと略平行とされている。
【００１８】
また、内側の側壁１ｊは、図３に示すように、底面板１ａの上方に突出して外側の側壁１ｂと略平行に３つ設けられ、コの字状とされている。また、内側の側壁１ｊは、図４及び図５に示すように、内部に空洞を有し断面が逆Ｕ字状形状とされている。これらの内側の側壁１ｊは、それぞれの高さが外側の側壁１ｂよりも低く、それらの上部を形成する側壁上面板１ｉは、底面板１ａと略平行とされている。
【００１９】
また、第１の緩衝部材１ｋは、図４に示すように、内側の側壁１ｊの側壁上面板１ｉの中間部に形成された２つの平行なスリットＳと、スリットＳ間に位置する上下方向に撓み可能な第１の撓み部Ｔ１と、この第１の撓み部Ｔ１に上方に突出して形成され、半球状の先端を有する棒状の２つの凸部Ｄとからなり、内側の側壁１ｊの側壁上面板１ｉに、それぞれ離れて複数個設けられている。
【００２０】
また、第２の緩衝部材１ｌは、図５に示すように、内側の側壁１ｊの側壁上面板１ｉ上の端部に形成されたコの字状のスリットＳと、スリットＳ内に位置し、一端が側壁上面板１ｉに連結されて他端が上下方向に撓み可能な片持ち状の第２の撓み部Ｔ２と、この第２の撓み部Ｔ２の側壁上面板１ｉと連結されていない自由端部上方に突出して形成され、半球状の先端を有する１つの棒状の凸部Ｄとからなる。この第２の緩衝部材１ｌは、片持ち状とされているため、第１の緩衝部材１ｋの第１の撓み部Ｔ１と比べて第２の撓み部Ｔ２が撓みやすい。これらの第２の緩衝部材１ｌは、内側の側壁１ｊの側壁上面板１ｉの各両端部に、２つずつ設けられている。また、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌの凸部Ｄは、同一側壁内は全て同じ高さとなるように設けられている。
【００２１】
また、規制突起部１ｍは、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌの側部近傍の側壁上面板１ｉの上方に突出して設けられた棒状の突起からなり、その高さは、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌよりも低くされ、全て同じ高さとなるように設けられている。また、位置決めボス１ｎは、各内側の側壁１ｊの交差部及び端部の側壁上面板１ｉ上、あるいは外側の側壁１ｂの、少なくとも底面板１ａの対角となる位置に設けられ、底面板１ａと垂直となる柱状をなしている。尚、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌに設けられた凸部Ｄは、２つ設けるとしたが１つあるいは３つ以上設けることも可能である。また、凸部Ｄの形状は棒状に限らず、例えば平板状の突起部とすることも可能である。
【００２２】
また、液晶材が封入された平板状の液晶表示素子２は、その外周に電気部品が搭載されたプリント基板３が、可撓性を有し液晶表示素子駆動用ＩＣが設けられたプリントフィルム４により電気的に接続されて取り付けられている。
【００２３】
平板状の導光体５、細長い棒形状をなしたランプ６がケース１内に収納され、また、導光体５の上方には、プリントフィルム４によりプリント基板３が取り付けられた液晶表示素子２が、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌに設けられた凸部Ｄに当接して収納されている。この際、第２の緩衝部材１ｌの凸部Ｄは、液晶表示素子２の角部に当接し、第１の緩衝部材１ｋの凸部Ｄは、液晶表示素子２の外周部の２つの角部の間の辺部に当接する。
【００２４】
金属板からなる取付部材７は、上面板７ａと、上面板７ａに形成された開口部７ｂと、開口部７ｂの外周近傍で上面板７ａに突き出し加工により設けられた凸条の押え部７ｃと、上面板７ａに穿設された複数の位置決め孔７ｄと、上面板７ａの外周部を折り曲げて形成された４つの側面板７ｅと、側面板７ｅから下方に一体に伸びた複数のＬ字状の腕部７ｆと、側面板７ｅの下方に一体に伸びた複数の誘導片７ｇとで構成されている。
【００２５】
開口部７ｂは、液晶表示素子２の有効表示領域よりも大きく開口されている。また、位置決め孔７ｄは、図１、図２に示すように、上面板７ａに貫通して複数個設けられ、少なくとも上面板７ａの対角位置に設けてなる。また、腕部７ｆは、側面板７ｅと連結された連結部７ｈと、水平方向に長く伸びた係止部７ｉとによりＬ字状に構成されている。また、誘導片７ｇは、少なくとも相対向する２つの側面板７ｅの下方に延出して設けられ、外側の側壁１ｂに設けられた誘導溝１ｇの幅よりも若干幅狭に形成されている。尚、この実施の形態では取付部材７を金属板からなるもので説明したが、合成樹脂の成型品を使用しても良い。
【００２６】
取付部材７は、位置決めボス１ｎの先端部が位置決め孔７ｄ内に嵌合されて、ケース１の上方を覆うように被せられ、腕部７ｆの係止部７ｉで爪部１ｃに係止されている。また、誘導片７ｇは、誘導溝１ｇを構成する２つの誘導突起部１ｆ間に位置されている。また、ケース１内に収納されたランプ６及びプリント基板３が上面板７ａによって覆い隠されるとともに、導光体５上部の液晶表示素子２が、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌの凸部Ｄと、押え部７ｃとにより挟持され、液晶表示素子２の有効表示領域が開口部７ｂより露出された状態で取り付けられている。
また、取付部材７がケース１に取り付けられた状態では、位置決め孔７ｄ内から位置決めボス１ｎの先端部が外部より視認できる程度に突出している。また、腕部７ｆの係止部７ｉの上端と、爪部１ｃの下面とが接触して係止されている。
【００２７】
本発明の液晶表示装置を組み立てるには、まず、ケース１内の所定位置に、導光体５及びランプ６を収納し、次にプリント基板３がプリントフィルム４により電気的に接続された液晶表示素子２を、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌの凸部Ｄ上に載置して、導光体５の上部に配設する。この際、第２の緩衝部材１ｌの凸部Ｄは、液晶表示素子２の角部に当接し、第１の緩衝部材１ｋの凸部Ｄは、液晶表示素子２の外周部の２つの角部の間に位置する、１〜４つの辺部に当接する。次に、誘導片７ｇを、誘導溝１ｇをガイドとして挿入すると共に、位置決めボス１ｎが位置決め孔７ｄに嵌合、位置決めさせて、取付部材７をケース１の上方に被せる。次に、誘導片７ｇを誘導溝１ｇで案内させながら、腕部７ｆの係止部７ｉを爪部１ｃの傾斜面に当接させ、係止部７ｉの上端が爪部１ｃの下面を越えるまで、取付部材７をケース１に押し付けて圧入する。この際、爪部１ｃが設けられている外側の側壁１ｂは、その裏側に設けられている空隙部１ｅ方向へ撓むため、腕部７ｆの圧入がスムーズに行われる。また、取付部材７を押し付けた際に、ストッパー１ｈの上面が取付部材７の側面板７ｅの下端と当接し、過剰な押し付けを規制するとともに、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌの凸部Ｄを有する第１、第２の撓み部Ｔ１、Ｔ２が下方へ撓むことにより、押し付け力を吸収し、液晶表示素子２に余分な力が加わるのを防ぐ。また、取付部材７の押し付けがより過度になされた場合には、液晶表示素子２の下方への押し付けによる、第１、第２の撓み部Ｔ１、Ｔ２の過剰な撓みを規制突起部１ｍが規制する。このようにして、本発明の液晶表示装置の組み立てが完了する。
【００２８】
前記液晶表示装置の組立後に、図９中に矢印で示すように、液晶表示装置の上下方向に衝撃や静荷重等の外部応力が加えられた場合には、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌの第１、第２の撓み部Ｔ１、Ｔ２が撓み、凸部Ｄが上下に移動して外部応力を吸収し、液晶表示素子２に対して過剰な力が加わるのを防ぎ、液晶表示素子２の破損が防止される。
【００２９】
図１０は、本発明の液晶表示装置の第２の実施の形態の要部断面図であり、同図Ａは、液晶表示装置の断面図であり、同図Ｂは、同図Ａの１０Ｂ−１０Ｂ線における断面図である。第１の実施の形態では、第１の緩衝部材１ｋ及び第２の緩衝部材１ｌはケース１に設けるとしたが、同様の部材を取付部材７の上面板７ａに設けることも可能である。
【００３０】
即ち、第１の実施の形態で示した上面板７ａの内側面の押え部７ｃが設けられた位置に、内部に空洞を有し断面が逆Ｕ字状形状とされた内側の側壁７ｊを設け、それらの上部を形成する側壁上面板７ｋに、第１の実施の形態と同様の構造を有する第１の緩衝部材７ｌ及び第２の緩衝部材７ｍを設ける。また、ケース１の内側の第１の緩衝部材１ｋ及び第２の緩衝部材１ｌが設けられた位置には、直方体状の支持部材１ｐを設ける。この際、第２の緩衝部材７ｍの凸部Ｄは、液晶表示素子２の角部に当接し、第１の緩衝部材７ｌの凸部Ｄは、液晶表示素子２の外周部の２つの角部の間の辺部に当接する。そして、これらの緩衝部材７ｌ及び７ｍの凸部Ｄと支持部材１ｐとにより液晶表示素子２を挟持する。
また、規制突起部７ｎは、第１の緩衝部材７ｌ及び第２の緩衝部材７ｍの側部近傍の側壁上面板７ｋの上方に突出して設けられた棒状の突起からなり、その高さは、第１の緩衝部材７ｌ及び第２の緩衝部材７ｍよりも低くされ、全て同じ高さとなるように設けられている。
その他の構成は、第１の実施の形態と同様の構成としてあり、同一部品には同一番号を付し、ここではその説明を省略する。
【００３１】
【発明の効果】
本発明の液晶表示装置によれば、ケースには、側壁、又は前記取付部材には、上面板を設け、側壁又は前記上面板には、２つの平行なスリット間に位置して上下方向に撓み可能な第１の撓み部を設け、第１の緩衝部材を、第１の撓み部と、第１の撓み部に形成された凸部とで構成し、側壁又は上面板には、凸部の近傍に、凸部よりも低い、液晶表示素子に当接可能な規制突起部を設けたことにより、新たな緩衝部材を設ける必要が無く、ケース又は取付部材の製造時に同時に形成できるため、液晶表示装置の製造コストの上昇を防ぐことができる。また、緩衝部材は、圧力を加えられても液晶表示素子の表示に悪影響を及ぼすことが無い。
また、第１の緩衝部材を、第１の撓み部と、この第１の撓み部に形成された凸部とで構成したことにより、液晶表示装置の組み立て時や組み立て後に、上下方向に外部応力が加えられた場合に、液晶表示素子に加わる過剰な力を吸収して破損を防止することができる。
更に、凸部の近傍に、凸部よりも低い、規制突起部を設けたことにより、過度の外部応力が加えられた場合に、液晶表示素子の下方への押し付けによって、撓み部が過剰に撓むのを規制突起部が規制して、撓み部の破損を防止することができる。
【００３２】
また、一端が前記側壁、又は前記上面板に連結されて上下方向に撓み可能な腕状の第２の撓み部を設け、第２の前記緩衝部材を、前記第２の撓み部と、前記第２の撓み部に形成された前記凸部とで構成してＬ字状に形成し、前記第２の緩衝部材が前記液晶表示素子の角部に当接し、前記第１の緩衝部材が前記液晶表示素子の２つの角部の間に当接することにより、片持ち状となっている第２の緩衝部材は、第１の緩衝部材と比べて撓み部が撓みやすいため、液晶表示素子の破損しやすい角部に柔らかく当接し、液晶表示素子の角部を保護することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の液晶表示装置の斜視図である。
【図２】本発明の第１の実施の形態の液晶表示装置の分解斜視図である。
【図３】本発明の第１の実施の形態の液晶表示装置の要部の斜視図である。
【図４】本発明の第１の実施の形態の液晶表示装置の要部を拡大した説明図である。
【図５】本発明の第１の実施の形態の液晶表示装置の要部を拡大した説明図である。
【図６】本発明の第１の実施の形態の液晶表示装置の要部側面図である。
【図７】図６の７−７線における要部断面図である。
【図８】本発明の第１の実施の形態の液晶表示装置の要部側面図である。
【図９】本発明の第１の実施の形態の液晶表示装置に対して外部応力を加えたときの断面図である。
【図１０】本発明の液晶表示装置の第２の実施の形態の要部断面図である。
【図１１】従来の液晶表示装置の斜視図である。
【図１２】従来の液晶表示装置の分解斜視図である。
【図１３】従来の液晶表示装置の組み立てを示す説明図である。
【符号の説明】
１ケース
１ａ底面板
１ｂ外側の側壁
１ｃ爪部
１ｄ凹部
１ｅ空隙部
１ｆ誘導突起部
１ｇ誘導溝
１ｈストッパー
１ｉ側壁上面板
１ｊ内側の側壁
１ｋ第１の緩衝部材
１ｌ第２の緩衝部材
１ｍ規制突起部
１ｎ位置決めボス
１ｐ支持部材
２液晶表示素子
３プリント基板
４プリントフィルム
５導光体
６ランプ
７取付部材
７ａ上面板
７ｂ開口部
７ｃ押え部
７ｄ位置決め孔
７ｅ側面板
７ｆ腕部
７ｇ誘導片
７ｈ連結部
７ｉ係止部
７ｊ内側の側壁
７ｋ側壁上面板
７ｌ第１の緩衝部材
７ｍ第２の緩衝部材
７ｎ規制突起部
Ｓスリット
Ｔ撓み部
Ｄ凸部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly to a buffer member provided in a case for disposing a liquid crystal display element that constitutes the liquid crystal display device.
[0002]
[Prior art]
11 is a perspective view of a conventional liquid crystal display device, FIG. 12 is an exploded perspective view of the conventional liquid crystal display device, and FIG. 13 is an explanatory view showing assembly of the conventional liquid crystal display device.
A box-shaped case 21 made of a synthetic resin molded product and having an open top includes a bottom plate 21a, four side walls 21b provided on the outer periphery of the bottom plate 21a, and a ridge protruding upward from the bottom plate 21a. It comprises a plurality of support members 21c composed of a portion and a plurality of recesses 21d provided at the lower part of the outer surface of the side wall 21b.
[0003]
The flat liquid crystal display element 22 in which the liquid crystal material is sealed has a buffer member 23 made of rubber having silicon-based elasticity attached to the outer periphery of the lower surface thereof with an adhesive. Further, on the outer periphery of the liquid crystal display element 22, a printed board 24 on which electrical components are mounted is attached by being electrically connected by a print film 25 having flexibility and provided with a liquid crystal display element driving IC. ing.
[0004]
A flat light guide 26 and an elongated rod-shaped lamp 27 are housed in the case 21, and a liquid crystal display element 22 having a printed board 24 attached by a print film 25 above the light guide 26. Is stored.
[0005]
The attachment member 28 made of a metal plate includes an upper surface plate 28a, an opening portion 28b formed in the upper surface plate 28a, and a ridge presser portion 28c provided by protrusion processing on the upper surface plate 28a near the outer periphery of the opening portion 28b. The four side plates 28d are formed by bending the outer peripheral portion of the top plate 28a, and a plurality of L-shaped arm portions 28e integrally extending downward from the side plate 28d. The opening 28b is opened larger than the effective display area of the liquid crystal display element 22, and the arm 28e is connected to the side plate 28d and extends in the vertical direction, and the horizontal portion extends in the horizontal direction. The portion 28g is L-shaped.
[0006]
As shown in FIG. 11, the attachment member 28 is covered so as to cover the upper side of the case 21, and the printed board 24 and the lamp 27 housed in the case 21 are covered with the upper surface plate 28 a, and the attachment member 28. The horizontal portion 28g of the arm portion 28e is bent inward of the concave portion 21d and fixed to the case 21. Further, the liquid crystal display element 22 above the light guide 26 is sandwiched between the support member 21c and the pressing portion 28c with the buffer member 23 interposed, and the effective display area of the liquid crystal display element 22 is exposed from the opening 28b. Thus, the conventional liquid crystal display device is configured.
[0007]
In order to assemble a conventional liquid crystal display device, the mounting member 28 is covered from above the case 21, and the horizontal portion 28g of the arm portion 28e is bent inward of the concave portion 21d while pressing as shown by an arrow in FIG. 13B. At this time, even if the attachment member 28 is pressed with an excessive force, the buffer member 23 is contracted in the vertical direction and absorbs the force, so that the liquid crystal display element 22 can be prevented from being damaged.
Further, even if external stress such as impact or static load is applied after the assembly of the conventional liquid crystal display device, the buffer member 23 is similarly contracted in the vertical direction to absorb the external stress, and the liquid crystal display element 22 is damaged. Is prevented.
[0008]
[Problems to be solved by the invention]
However, the material cost of the buffer member 23 made of rubber to be attached to the liquid crystal display element 22 is increased, and the number of steps for attaching the buffer member 23 to the liquid crystal display element 22 in the manufacturing process of the liquid crystal display device is increased. The manufacturing cost of the apparatus has been increased.
[0009]
In addition, the conventional liquid crystal display device is used for a long time due to heat generated from electronic components on the printed circuit board 24 in the liquid crystal display device and pressure when sandwiched between the support member 21c and the pressing portion 28c. As a result, the buffer member 23 is gradually deformed, and the liquid crystal display element 22 protrudes to the effective display region, causing a problem in display.
[0010]
[Means for Solving the Problems]
As a first means for solving the above problems, a liquid crystal display element of the present invention comprises a liquid crystal display element, a case for attaching the liquid crystal display element by sandwiching the liquid crystal display element up and down, and an attachment member. Provided integrally with the mounting member is a buffer member having a convex portion that is in contact with the liquid crystal display element and is movable in the vertical direction. The case is provided with a side wall, or the mounting member is provided with an upper surface plate. The upper surface plate is provided with a first bending portion that is positioned between two parallel slits and can be bent in the vertical direction, and the first buffer member is arranged between the first bending portion and the first bending portion. The convex part formed in the flexure part, and the side wall or the upper surface plate is provided with a regulation projection part that is lower than the convex part and that can contact the liquid crystal display element in the vicinity of the convex part. The configuration was provided.
[0011]
As a second solution, the liquid crystal display element of the present invention is provided with a cantilever-like second bending portion in which one end is connected to the side wall or the top plate and the other end can be bent in the vertical direction. , the second of said buffer member, and the second bending portion, wherein constituted by a second flexure said convex portion formed on portions formed in an L-shape, said second cushioning member is the The liquid crystal display element is in contact with the corner portion, and the first buffer member is in contact with the two corner portions of the liquid crystal display element .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the liquid crystal display device of the present invention will be described. FIG. 1 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the liquid crystal display device according to the first embodiment of the present invention, and FIG. It is a perspective view of the principal part of the liquid crystal display device of 1st Embodiment. 4 and 5 are enlarged explanatory views of the main part of the liquid crystal display device according to the first embodiment of the present invention. 6 is a side view of the main part of the liquid crystal display device according to the first embodiment of the present invention, FIG. 7 is a cross-sectional view of the main part taken along line 7-7 of FIG. 6, and FIG. FIG. 8 is a side view of the main part of the liquid crystal display device according to the first embodiment, where FIG. A is a cross-sectional view of the main part taken along line 8A-8A in FIG. 6 and FIG. FIG. 9 is a cross-sectional view when an external stress is applied to the liquid crystal display device according to the first embodiment of the present invention. FIG. 9A is a cross-sectional view in FIG. 8A, and FIG. It is sectional drawing in the 9B-9B line of 9A.
[0016]
A box-shaped case 1 made of a heat-resistant synthetic resin and having an open top includes a bottom plate 1a, four outer side walls 1b provided on the outer periphery of the bottom plate 1a, and an outer side wall 1b. A plurality of claw portions 1c provided protruding from the side surface, a plurality of recesses 1d provided on the outer side wall 1b below the claw portion 1c, and a gap provided on the back side of the claw portion 1c of the outer side wall 1b 1e, a plurality of guide projections 1f provided on the outer surface of the outer side wall 1b, a guide groove 1g formed by a gap between the two guide projections 1f, and a projection provided on the outer side of the outer side wall 1b Stopper 1h.
The case 1 is provided so as to protrude above the bottom surface plate 1a, and a plurality of cases 1 are provided at the inner side wall 1j having the side wall upper surface plate 1i and at the intermediate portion of the inner side wall 1j on the side wall upper surface plate 1i. Buffer member 1k, a plurality of second buffer members 1l provided at the end on the side wall upper surface plate 1i of the inner side wall 1j, and the vicinity of the side portions of the first buffer member 1k and the second buffer member 1l And a plurality of positioning bosses 1n provided so as to protrude upward on the side wall upper surface plate 1i of the inner side wall 1j. .
[0017]
A plurality of claw portions 1c are provided on the outer side surface of the outer side wall 1b, and are formed such that the protruding height from the outer side surface of the outer side wall 1b gradually increases from the upper side to the lower side of the outer side wall 1b. ing. The lower surface of the claw portion 1c is provided so as to be substantially parallel to the bottom plate 1a. Moreover, the recessed part 1d is provided in the thickened part of the inner side lower part connected with the bottom face board 1a of the outer side wall 1b, as shown in FIG. Moreover, the space | gap part 1e is provided except the thick part of the back side of the outer side wall 1b in which the nail | claw part 1c is provided. In addition, a plurality of guide protrusions 1f are provided so that the outer surface of the outer side wall 1b is thick and protrudes from the outer surface. In addition, the guide groove 1g is constituted by a gap formed by two surfaces of the two guide projections 1f that are perpendicular to the bottom plate 1a and face each other. The guide groove 1g is provided on at least two outer side walls 1b facing each other. The stopper 1h has a thick lower portion on the outer side surface of the outer side wall 1b, and a plurality of stoppers 1h are provided so as to protrude from the outer side surface, and its upper surface is substantially parallel to the bottom plate 1a.
[0018]
Further, as shown in FIG. 3, the inner side wall 1j protrudes upward from the bottom plate 1a and is provided in three substantially parallel to the outer side wall 1b. Moreover, as shown in FIG.4 and FIG.5, the inner side wall 1j has a cavity inside and is made into the reverse U-shaped cross section. The inner side walls 1j are lower in height than the outer side walls 1b, and the side wall upper surface plate 1i forming the upper portion thereof is substantially parallel to the bottom surface plate 1a.
[0019]
Further, as shown in FIG. 4, the first buffer member 1k includes two parallel slits S formed in the middle portion of the side wall upper surface plate 1i of the inner side wall 1j, and a vertical direction located between the slits S. The first flexible portion T 1 that can be bent and two rod-shaped convex portions D that protrude upward from the first flexible portion T 1 and have a hemispherical tip. A plurality of the sidewall upper surface plates 1 i are provided separately from each other.
[0020]
Further, as shown in FIG. 5, the second buffer member 11 is located in the slit S with a U-shaped slit S formed at the end on the side wall upper surface plate 1 i of the inner side wall 1 j, one end of the second bending portion T 2 cantilevered deflectable in linked other end is vertically on the side wall top plate 1i, not connected to the second bending portion T 2 of the side wall top plate 1i It consists of one rod-like convex part D that protrudes above the free end part and has a hemispherical tip. The second cushioning member 1l, since there is a cantilevered, first flexure second flexure portion T 2 is easily bent as compared to the T1 of the first cushioning member 1k. Two of these second buffer members 11 are provided at each end of the side wall upper surface plate 1i of the inner side wall 1j. Further, the convex portions D of the first buffer member 1k and the second buffer member 1l are provided so as to all have the same height in the same side wall.
[0021]
The restricting protrusion 1m is a rod-like protrusion provided so as to protrude above the side wall upper surface plate 1i in the vicinity of the side portions of the first buffer member 1k and the second buffer member 1l. It is lower than the first buffer member 1k and the second buffer member 1l, and is provided so as to all have the same height. Further, the positioning boss 1n is provided on the side wall upper surface plate 1i at the intersection and end of each inner side wall 1j, or at the opposite side of the outer side wall 1b at least at the diagonal of the bottom surface plate 1a. It has a vertical column shape. In addition, although the two convex portions D provided on the first buffer member 1k and the second buffer member 1l are provided, it is possible to provide one or more than three. Further, the shape of the convex portion D is not limited to a rod shape, and may be a flat projection, for example.
[0022]
Further, the flat liquid crystal display element 2 in which the liquid crystal material is encapsulated has a printed circuit board 3 on which an electrical component is mounted on the outer periphery thereof, and a print film 4 having a flexible liquid crystal display element driving IC. Are attached and connected electrically.
[0023]
A flat light guide 5 and an elongated rod-shaped lamp 6 are accommodated in the case 1, and a liquid crystal display element 2 having a printed circuit board 3 attached by a print film 4 above the light guide 5. However, the first buffer member 1k and the second buffer member 1l are accommodated in contact with the convex portion D. At this time, the convex portion D of the second buffer member 11 is in contact with the corner portion of the liquid crystal display element 2, and the convex portion D of the first buffer member 1 k is two corner portions of the outer peripheral portion of the liquid crystal display element 2. It contacts the side part between.
[0024]
The attachment member 7 made of a metal plate includes an upper surface plate 7a, an opening portion 7b formed in the upper surface plate 7a, and a ridge presser portion 7c provided by protrusion processing on the upper surface plate 7a near the outer periphery of the opening portion 7b. , A plurality of positioning holes 7d drilled in the upper surface plate 7a, four side plates 7e formed by bending the outer peripheral portion of the upper surface plate 7a, and a plurality of L-shapes integrally extending downward from the side surface plate 7e. Arm portion 7f and a plurality of guide pieces 7g integrally extending below the side plate 7e.
[0025]
The opening 7 b is larger than the effective display area of the liquid crystal display element 2. As shown in FIGS. 1 and 2, a plurality of positioning holes 7d are provided penetrating the upper surface plate 7a, and are provided at least at diagonal positions of the upper surface plate 7a. Moreover, the arm part 7f is comprised by the L-shape with the connection part 7h connected with the side plate 7e, and the latching | locking part 7i extended long in the horizontal direction. In addition, the guide piece 7g is provided so as to extend at least below the two side plates 7e facing each other, and is slightly narrower than the width of the guide groove 1g provided on the outer side wall 1b. In this embodiment, the mounting member 7 is made of a metal plate. However, a synthetic resin molded product may be used.
[0026]
The mounting member 7 is fitted so that the tip end portion of the positioning boss 1n is fitted in the positioning hole 7d and covers the upper portion of the case 1, and is locked to the claw portion 1c by the locking portion 7i of the arm portion 7f. Yes. In addition, the guide piece 7g is positioned between the two guide protrusions 1f constituting the guide groove 1g. Further, the lamp 6 and the printed circuit board 3 housed in the case 1 are covered with the upper surface plate 7a, and the liquid crystal display element 2 on the light guide 5 is provided with the first buffer member 1k and the second buffer member 11. The convex portion D and the pressing portion 7c are attached, and the effective display area of the liquid crystal display element 2 is attached so as to be exposed from the opening 7b.
Further, in the state where the attachment member 7 is attached to the case 1, the tip end portion of the positioning boss 1n protrudes from the positioning hole 7d to the extent that it can be seen from the outside. Further, the upper end of the locking portion 7i of the arm portion 7f and the lower surface of the claw portion 1c are brought into contact and locked.
[0027]
In order to assemble the liquid crystal display device of the present invention, first, the light guide 5 and the lamp 6 are accommodated in a predetermined position in the case 1, and then the printed circuit board 3 is electrically connected by the print film 4. The element 2 is placed on the convex portion D of the first buffer member 1k and the second buffer member 11 and disposed on the light guide 5. At this time, the convex portion D of the second buffer member 11 is in contact with the corner portion of the liquid crystal display element 2, and the convex portion D of the first buffer member 1 k is two corner portions of the outer peripheral portion of the liquid crystal display element 2. It abuts on one to four sides located between the two. Next, the guide piece 7g is inserted using the guide groove 1g as a guide, and the positioning boss 1n is fitted and positioned in the positioning hole 7d, and the mounting member 7 is placed over the case 1. Next, while guiding the guide piece 7g with the guide groove 1g, the locking portion 7i of the arm portion 7f is brought into contact with the inclined surface of the claw portion 1c until the upper end of the locking portion 7i exceeds the lower surface of the claw portion 1c. The attachment member 7 is pressed into the case 1 and press-fitted. At this time, the outer side wall 1b on which the claw portion 1c is provided bends in the direction of the gap 1e provided on the back side thereof, so that the arm portion 7f is smoothly press-fitted. Further, when the mounting member 7 is pressed, the upper surface of the stopper 1h comes into contact with the lower end of the side plate 7e of the mounting member 7 to restrict excessive pressing, and the first buffer member 1k and the second buffer member 1l. The first and second bent portions T1 and T2 having the convex portion D are bent downward, thereby absorbing the pressing force and preventing the liquid crystal display element 2 from being applied with an excessive force. In addition, when the attachment member 7 is pressed excessively, the restricting projection 1m causes excessive bending of the first and second bent portions T1 and T2 due to the downward pressing of the liquid crystal display element 2. regulate. In this way, the assembly of the liquid crystal display device of the present invention is completed.
[0028]
After assembly of the liquid crystal display device, as shown by an arrow in FIG. 9, when the external stress, such as impact or static load is applied in the vertical direction of the liquid crystal display device includes a first cushioning member 1k and the second The first and second bent portions T 1 and T 2 of the buffer member 1 l are bent, and the convex portion D moves up and down to absorb external stress and prevent an excessive force from being applied to the liquid crystal display element 2. The liquid crystal display element 2 is prevented from being damaged.
[0029]
FIG. 10 is a cross-sectional view of the main part of the second embodiment of the liquid crystal display device of the present invention, FIG. 10A is a cross-sectional view of the liquid crystal display device, and FIG. It is sectional drawing in the 10B line. In the first embodiment, the first shock-absorbing member 1k and the second shock-absorbing member 11 are provided in the case 1, but similar members can be provided on the upper surface plate 7a of the mounting member 7.
[0030]
That is, the inner side wall 7j having a cavity inside and having a cross-section of an inverted U shape is provided at the position where the pressing portion 7c on the inner side surface of the upper surface plate 7a shown in the first embodiment is provided. The first buffer member 7l and the second buffer member 7m having the same structure as that of the first embodiment are provided on the side wall upper surface plate 7k that forms the upper part thereof. In addition, a rectangular parallelepiped support member 1p is provided at a position where the first buffer member 1k and the second buffer member 1l inside the case 1 are provided. At this time, the convex portion D of the second buffer member 7m is in contact with the corner portion of the liquid crystal display element 2, and the convex portion D of the first buffer member 7l is two corner portions of the outer peripheral portion of the liquid crystal display element 2. It contacts the side part between. And the liquid crystal display element 2 is clamped by the convex part D of these buffer members 7l and 7m, and the supporting member 1p.
The restricting protrusion 7n is a rod-like protrusion provided so as to protrude above the side wall upper surface plate 7k in the vicinity of the side portions of the first buffer member 7l and the second buffer member 7m. It is lower than the first buffer member 7l and the second buffer member 7m, and is provided so as to all have the same height.
Other configurations are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals, and the description thereof is omitted here.
[0031]
【The invention's effect】
According to the liquid crystal display device of the present invention, the case is provided with an upper surface plate on the side wall or the mounting member, and the side wall or the upper surface plate is positioned between two parallel slits and bends in the vertical direction. A possible first bending portion is provided, and the first buffer member is configured by the first bending portion and a convex portion formed in the first bending portion, and the side wall or the upper surface plate has a convex portion. in the vicinity, lower than the convex portion, by providing the abutment possible regulating protrusion to the liquid crystal display device, it is not necessary to provide a new was Do cushioning member, it is possible to form simultaneously with the production of the case or the mounting member, the liquid crystal An increase in manufacturing cost of the display device can be prevented. The buffer member does not adversely affect the display of the liquid crystal display element even when pressure is applied.
In addition, since the first buffer member is constituted by the first bent portion and the convex portion formed on the first bent portion, external stress is applied in the vertical direction during or after the assembly of the liquid crystal display device. Can be prevented by absorbing excessive force applied to the liquid crystal display element.
Further, by providing a restricting projection lower than the convex portion in the vicinity of the convex portion, when the excessive external stress is applied, the bending portion is excessively bent due to the downward pressing of the liquid crystal display element. It is possible to prevent the bending portion from being damaged by restricting the restriction protrusions.
[0032]
Also, an arm-shaped second bending portion that is connected at one end to the side wall or the upper surface plate and can be bent in the up-down direction is provided, and the second buffer member is connected to the second bending portion and the first bending portion. And the convex portion formed in the second bent portion, and is formed in an L shape. The second buffer member is in contact with a corner of the liquid crystal display element, and the first buffer member is the liquid crystal. The liquid crystal display element is damaged because the second buffer member that is cantilevered by contacting between the two corners of the display element is more easily bent than the first buffer member. The corner portion of the liquid crystal display element can be protected by softly contacting the corner portion .
[Brief description of the drawings]
FIG. 1 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the liquid crystal display device according to the first embodiment of the present invention.
FIG. 3 is a perspective view of a main part of the liquid crystal display device according to the first embodiment of the present invention.
FIG. 4 is an explanatory diagram enlarging a main part of the liquid crystal display device according to the first embodiment of the present invention.
FIG. 5 is an explanatory diagram enlarging a main part of the liquid crystal display device according to the first embodiment of the present invention;
FIG. 6 is a side view of a main part of the liquid crystal display device according to the first embodiment of the present invention.
7 is a cross-sectional view of relevant parts taken along line 7-7 in FIG.
FIG. 8 is a side view of an essential part of the liquid crystal display device according to the first embodiment of the present invention.
FIG. 9 is a cross-sectional view when an external stress is applied to the liquid crystal display device according to the first embodiment of the present invention.
FIG. 10 is a cross-sectional view of main parts of a second embodiment of a liquid crystal display device of the present invention.
FIG. 11 is a perspective view of a conventional liquid crystal display device.
FIG. 12 is an exploded perspective view of a conventional liquid crystal display device.
FIG. 13 is an explanatory view showing assembly of a conventional liquid crystal display device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 1a Bottom plate 1b Outer side wall 1c Claw part 1d Recessed part 1e Cavity part 1f Guide projection part 1g Guide groove 1h Stopper 1i Side wall upper surface board 1j Inner side wall 1k First buffer member 1l Second buffer member 1m Control projection part 1n Positioning boss 1p Support member 2 Liquid crystal display element 3 Printed circuit board 4 Print film 5 Light guide 6 Lamp 7 Mounting member 7a Upper surface plate 7b Opening portion 7c Holding portion 7d Positioning hole 7e Side plate 7f Arm portion 7g Guide piece 7h Connecting portion 7i Locking portion 7j Inner side wall 7k Side wall upper surface plate 7l First buffer member 7m Second buffer member 7n Regulating projection S Slit T Deflection D Projection

Claims

A liquid crystal display element, and a case and an attachment member that are attached by sandwiching the liquid crystal display element up and down, and a convex that is movable in the vertical direction in contact with the liquid crystal display element integrally with the case or the attachment member. A cushioning member having a portion is provided , a side wall is provided on the case, or an upper surface plate is provided on the mounting member, and the side wall or the upper surface plate is positioned between two parallel slits and can be bent vertically. A first bending portion is provided, and the first buffer member is configured by the first bending portion and the convex portion formed in the first bending portion, and the side wall or the upper surface plate is provided with the first bending portion. A liquid crystal display device, characterized in that a restriction projection that is lower than the projection and is capable of contacting the liquid crystal display element is provided in the vicinity of the projection .

One end is connected to the side wall or the upper surface plate, and the other end is provided with a cantilevered second bending portion that can be bent in the vertical direction, the second buffer member, the second bending portion, The convex portion formed on the second bent portion is formed in an L shape, the second buffer member is in contact with a corner of the liquid crystal display element, and the first buffer member is The liquid crystal display device according to claim 1, wherein the liquid crystal display device is in contact between two corners of the liquid crystal display element .