JP3650044B2 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
JP3650044B2
JP3650044B2 JP2001138797A JP2001138797A JP3650044B2 JP 3650044 B2 JP3650044 B2 JP 3650044B2 JP 2001138797 A JP2001138797 A JP 2001138797A JP 2001138797 A JP2001138797 A JP 2001138797A JP 3650044 B2 JP3650044 B2 JP 3650044B2
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liquid crystal
flexible substrate
back case
crystal display
display device
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JP2001138797A
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JP2002333606A (en
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誠司 山根
俊哉 西尾
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Sanyo Electric Co Ltd
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Tottori Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
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Priority to JP2001138797A priority Critical patent/JP3650044B2/en
Priority to TW091108473A priority patent/TWI224293B/en
Priority to EP02722883A priority patent/EP1387334A4/en
Priority to PCT/JP2002/004299 priority patent/WO2002091340A1/en
Priority to CNB02809543XA priority patent/CN1249648C/en
Priority to US10/474,195 priority patent/US7206037B2/en
Priority to KR1020037014564A priority patent/KR100577511B1/en
Publication of JP2002333606A publication Critical patent/JP2002333606A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1601—Constructional details related to the housing of computer displays, e.g. of CRT monitors, of flat displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2200/00—Indexing scheme relating to G06F1/04 - G06F1/32
    • G06F2200/16—Indexing scheme relating to G06F1/16 - G06F1/18
    • G06F2200/161—Indexing scheme relating to constructional details of the monitor
    • G06F2200/1612—Flat panel monitor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J2211/44—Optical arrangements or shielding arrangements, e.g. filters or lenses
    • H01J2211/446—Electromagnetic shielding means; Antistatic means

Description

【０００１】
【発明の属する技術分野】
本発明は液晶表示装置に係り、特に蛍光灯などの複数の線状ランプを液晶パネルの背面直下に配置する直下型バックライトを用いたものに関する。
【０００２】
【従来の技術】
これまでカラーテレビには主にＣＲＴが用いられてきたが、最近では液晶表示装置の薄型化、低消費電力などのメリットを生かして液晶テレビが実用化されている。テレビや大型モニター用の液晶表示装置では、各画素を駆動するスイッチング素子にＴＦＴを用いたＴＦＴ型ＬＣＤが主流になっている。このＴＦＴ型の場合、液晶パネルを構成する一方のガラス基板上にＴＦＴに接続する走査線と信号線をマトリクス状に形成し、ガラス基板の周縁部にこの走査線や信号線の入力端子を配置している。一般に走査線よりも信号線の方が多数になるため、信号線の入力端子はガラス基板の長辺端部に、走査線の入力端子はガラス基板の短辺端部に集約して配置される。そして信号線の入力端子にはＴＡＢを介してソース駆動回路基板が、走査線の入力端子にはＴＡＢを介してゲート駆動回路基板がそれぞれ接続され、各駆動回路基板から各線に信号が供給される。ソース駆動回路基板やゲート駆動回路基板とは別体にコントロール回路基板が設けられ、このコントロール回路基板と各駆動回路基板はフレキシブル基板によって電気的に接続されている。
【０００３】
液晶パネルの裏面側に配置されるバックライトには、導光板の側面に線状ランプを配置したサイドエッジ型と、液晶パネルの背面直下に光源を配置した直下型がある。ノート型パソコンや小型携帯端末の液晶表示装置では特に薄型化が求められるため主にサイドエッジ型バックライトが採用されているが、液晶テレビや大型モニターの液晶表示装置では特に高輝度が求められるため主に直下型バックライトが採用されている。直下型の場合、液晶パネルの裏面側に液晶パネルと対向して複数の蛍光灯などの光源を配置し、光源と液晶パネルの間に拡散板や調光板などを配置する。蛍光灯は例えばＡｌなどで形成した背面ケースに収納されるが、直下型の場合、液晶パネルの表示部全域に均一な強さの光を供給して輝度ムラが生じないようにするために蛍光灯と液晶パネルの間隔を調整する必要があり、蛍光灯の本数が少なくなるとそれに応じて液晶パネルとの間隔を広く取るため、サイドエッジ型と比較してバックライトユニットが厚くなり、背面ケースは液晶パネルの裏面側に大きく張出した形状になる。背面ケースの内面を反射板として作用させたり、背面ケースと蛍光灯の間に反射板を配置するなどして、蛍光灯の光を効率良く液晶パネルに供給する。
【０００４】
図７にこの液晶表示装置の背面斜視図を示す。５０は液晶パネルを収納して支持する枠体、５１は金属製の背面ケース、５２は表示部分が開口した前面カバーである。液晶パネルを収納した枠体５０を背面ケース５１と前面カバー５２で挟み込み、前面カバー５２の周辺部の固定部５３を背面ケース５１側に折り曲げて一体化する。背面ケース５１の裏面にはコントロール回路基板が取付けられ、保護ケース５４で覆われている。５５は液晶パネルに取付けられたソース駆動回路基板と背面ケース５１に取付けられたコントロール回路基板とを電気的に接続するフレキシブル基板、５６はゲート駆動回路基板とコントロール回路基板とを電気的に接続するフレキシブル基板であり、コントロール回路基板からの各信号を供給している。
【０００５】
【発明が解決しようとする課題】
従来、このフレキシブル基板５５、５６を固定せずにそのままフリーにしていた。しかしＴＶや大型モニター用の液晶表示装置の場合、大型化、高精細化に伴い画素数が増加するために信号線も多数になり、特にソース駆動回路基板と接続するフレキシブル基板５５が大きくなってしまう。そのため液晶表示装置を取り扱う際にフレキシブル基板５５が引っ掛かり易くなり、フレキシブル基板５５の接続不良や破損が生じる問題があった。
【０００６】
また、フレキシブル基板を両面テープ等により背面ケースを固定する方法もあるが、この場合は液晶表示装置のメンテナンスのたびに両面テープを外したり取り替えたりする必要があり、メンテナンス性が悪いという欠点があった。
【０００７】
さらに、これまでのフレキシブル基板の場合、ＥＭＩ（Electromagnetic Interference）対策が十分ではなかった。ＴＶ用の液晶表示装置は大型で高画質が要求されるため、画素数の増加に伴い大きくなったフレキシブル基板５５へのＥＭＩ対策は今まで以上に重要になり、その対応が求められていた。
【０００８】
そこで本発明は、フレキシブル基板を簡単に着脱可能に固定でき、また十分なＥＭＩ対策を施した液晶表示装置を提案することを目的とする。
【０００９】
【課題を解決するための手段】
上記課題を解決するために本発明は、一対の基板間に液晶を封入すると共に一方の基板に走査線と信号線をマトリクス状に配置した液晶パネルと、液晶パネルの直下に配置された複数の光源と、光源を収納すると共に液晶パネルの裏面側を覆う背面ケースと、液晶パネルの前面に配置されると共に背面ケースに固定される前面カバーとを備えた液晶表示装置において、液晶パネルに搭載されると共に信号線に画像信号を供給する第１の制御回路基板と、背面ケースの裏面に配置された第２の制御回路基板と、第１の制御回路基板と第２の制御回路基板とを電気的に接続するフレキシブル基板と、フレキシブル基板を背面ケースに着脱可能に固定する固定手段を備えたことを特徴とする。
【００１０】
また本発明の固定手段は、背面ケースに形成された保持部と、保持部に着脱可能に支持される保護板とを備え、保護板を保持部に取付けたときに保護板によってフレキシブル基板を背面ケースに押付けた状態で保持することを特徴とする。
【００１１】
上記構成により、フレキシブル基板を簡単に背面ケースに取付けることができ、液晶表示装置の製造中やメンテナンス中のフレキシブル基板の破損を防止でき、組立て作業性が向上し、フレキシブル基板の収納スペースが少なくなる。また、メンテナンス時においてもフレキシブル基板を容易に取外すことができ、メンテナンス性も向上する。
【００１２】
また本発明は、保持部を背面ケースの一部分を切り起こして形成し、保護板を樹脂製で湾曲可能に形成することを特徴とする。上記構成により、安価な固定手段を実現することができる。
【００１３】
また本発明は、少なくともフレキシブル基板が押付けられる部分を金属製にした背面ケースと、ＥＭＩ対策用の金属膜を有するフレキシブル基板とを備え、固定手段によってフレキシブル基板が背面ケースに固定したときにフレキシブル基板の金属膜が背面ケースの金属部分と導通することを特徴とする。
【００１４】
上記構成により、フレキシブル基板のＥＭＩ対策用の金属膜が背面ケースを介してアースされることになり、フレキシブル基板のＥＭＩ対策が施される。
【００１５】
また本発明は、フレキシブル基板のＥＭＩ対策用の金属膜として、フレキシブル基板の大部分に亘って貼り合わされた金属箔を用いることを特徴とする。上記構成により安価にＥＭＩ対策を施すことができる。
【００１６】
また本発明は、フレキシブル基板のＥＭＩ対策用の金属膜として、フレキシブル基板の大部分を覆う金属メッシュを用いることを特徴とする。
【００１７】
また本発明は、フレキシブル基板のＥＭＩ対策用の金属膜として、フレキシブル基板を多層にすると共にその一層に亘って形成されたＧＮＤパターンを用いることを特徴とする。
【００１８】
【発明の実施の形態】
以下、本発明の実施形態を図に基づいて説明する。図１は本発明の実施形態である液晶表示装置の背面斜視図、図２は液晶表示装置の前面図、図３は液晶表示装置の前面カバーを取り外したときの前面図、図４は液晶表示装置の側面図、図５は図１の領域Ａの拡大概略図、図６は図４の領域Ｂの拡大概略図である。
【００１９】
液晶パネル１は一対のガラス基板５、６を中空状に貼り合わせ、そのガラス基板５、６の間に液晶を封入する。一方のガラス基板５上には複数の信号線と複数の走査線をマトリクス状に形成し、信号線と走査線の交差部分にＴＦＴを、信号線と走査線で囲まれる領域に画素電極をそれぞれ設ける。ＴＦＴはゲート電極を走査線に、ソース電極を信号線に、ドレイン電極を画素電極にそれぞれ接続し、走査線に供給される走査信号によってＴＦＴのＯＮ／ＯＦＦを制御し、信号線に供給される画像信号に基づいた電圧を画素電極に供給する。他方のガラス基板６には走査線や信号線に対向する部分に遮光膜を形成し、各画素に応じて所定の色のカラーフィルタを形成する。また画素電極に対向するように共通電極を遮光膜及びカラーフィルタ上に形成し、共通電極と画素電極の間の電界によって液晶分子の配列状態を制御している。
【００２０】
走査線や信号線を形成したガラス基板５はカラーフィルタを形成したガラス基板６よりも若干大きくなっており、ガラス基板５とガラス基板６を貼り合わせたときにガラス基板５の一方の長辺部分と短辺部分が露出する。この露出した長辺部分には信号線の入力端子が配置され、露出した短辺部分には走査線の入力端子が配置されている。そして信号線の入力端子はＴＡＢ７を介して第１の制御回路基板であるソース駆動回路基板（以下、ソースＰＷＢという）８と接続し、ソースＰＷＢ８から信号線に画像信号が供給され、走査線の入力端子はＴＡＢ９を介してゲート駆動回路基板(以下、ゲートＰＷＢという)１０と接続し、ゲートＰＷＢ１０から走査線にゲート信号が供給される。ソースＰＷＢ８とゲートＰＷＢ１０は共に細長い長方形状のプリント基板で形成され、プリント基板上に各制御回路が配置されている。
【００２１】
３は樹脂製の枠体であり、中央部分に開口を有し、数カ所にガラス基板５の側部と当接して位置決めする係止部が設けられている。そして液晶パネル１を枠体３に載置するとき、ガラス基板５が係止部１１に当接して液晶パネル１を枠体３内に保持できる。この枠体３に保持された液晶パネル１の前面側に前面カバー２を、背面側に背面ケース４を配置し、前面カバー２と背面ケース４によって液晶パネル１及び枠体３を挟み込んだ状態で固定して液晶表示装置を構成する。
【００２２】
前面カバー２は例えばＡｌ等の金属で形成され、液晶パネル１の表示部に対応する部分が開口している。前面カバー２の周辺部は枠体３の側面を覆うように折り曲げられ、その周辺部の所々に一部分を切り欠いて形成した固定部１２が設けられている。この固定部１２を背面ケース４側に折り曲げると前面カバー２を背面ケース４に固定できる。
【００２３】
この実施形態では直下型のバックライトを用い、背面ケース４内には複数の蛍光灯などの光源が収納され、この蛍光灯は液晶パネル１の長手方向に沿って配置されている。１３は背面ケース４の外側に導き出された蛍光灯のリード線である。背面ケース４はＡｌ等の金属で形成され、その内面側は蛍光灯の光を効率よく反射するようになっている。なお、蛍光灯と背面ケース４の間に反射板を配置してもよい。背面ケース４の形状は蛍光灯が収納できるように裏面側に大きく張り出している。
【００２４】
背面ケース４の裏面の一部分には第２の制御回路基板であるコントロール回路基板（以下、コントロールＰＷＢという）１４が配置され、コントロールＰＷＢ１４は保護カバー１５で覆われている。コントロールＰＷＢ１４には、ソースＰＷＢ８やゲートＰＷＢ１０に各信号を供給する制御回路が配置されている。１６はソースＰＷＢ８とコントロールＰＷＢ１４とを接続するＦＰＣ（フレキシブル基板）であり、１７はゲートＰＷＢ１０とコントロールＰＷＢ１４とを接続するＦＰＣ（フレキシブル基板）である。なお、ＦＰＣ１７は保護カバー１５に覆われるため、図１には図示していない。
【００２５】
ＦＰＣ１６はコントロールＰＷＢ１４側で２股に分岐しており、ソースＰＷＢ８とコントロールＰＷＢ１４とを電気的に接続する配線パターンが施され、この配線パターンと絶縁するＥＭＩ対策用の金属膜であるＡｌ又はＣｕ等の金属箔１８がＦＰＣ１６に貼り付けられる。図５のＦＰＣ１６の斜線部は金属箔１８を示す。この金属箔１８はＦＰＣ１６の背面ケース４と対向する面と背面ケース４と対向しない面の大部分に形成され、両面の金属箔１８は電気的に接続されている。この両面の金属箔１８の接続方法は、両面にまたがる金属箔１８をＦＰＣ１６の端部に設ける方法や、ＦＰＣ１６の適所にコンタクトホールを形成し、そのコンタクトホール部分で両面の金属箔１８を電気的に接続する処理を施してもよい。この実施形態ではＦＰＣ１６に金属箔１８を貼り付けるため、簡単な構成で且つ安価にＥＭＩ対策を図ることができる。
【００２６】
１９は背面ケース４に形成された保持部である保持片であり、２０は保持片１９に保持される保護板である。保持片１９は背面ケース４の一部分を切り起こして形成され、ＦＰＣ１６の横幅方向における両側とＦＰＣ１６の２股部分の間に位置する。保護板２０はプラスチック等の樹脂製による横長の板状に形成され、その長手方向から加わる力に対して湾曲可能であり、また加力が除かれた際に元の形状に戻る復元力を有している。なお、この保護板２０を金属により形成しても良いが、樹脂製の保護板２０と比較して湾曲した後の復元力が劣る金属製の保護板を用いる場合は、保持片１９の形状や配置を金属製の保護板に適した構成にする必要がある。保護板２０を保持片１９に取り付けるとき、保護板２０の一端をＦＰＣ１６の横側に位置する一方の保持片１９に引っ掛け、保護板２０と背面ケース４の間にＦＰＣ１６を介在させた状態で保護板２０を湾曲させ、保護板２０の他端をＦＰＣ１６の横側に位置する他方の保持片１９に挿入し、保護板２０の復元力により保持片１９に嵌め込む。このとき保護板２０は保持片１９により支持されて固定し、保護板２０によってＦＰＣ１６は背面ケース４に押付けられた状態で取付けられる。
【００２７】
この実施形態では、大きく背面側に張出した背面ケース４の側面部分（ＦＰＣが位置する部分）を傾斜面にして、その傾斜面に保持片１９を形成してＦＰＣ１６を固定している。従ってＦＰＣ１６を背面ケース４に固定した際にＦＰＣ１６が無理な形状に変形することがなく、ＦＰＣ１６を押え付けている保護板２０や保持片１９に余分な負荷がかからない。また、背面ケース４のＦＰＣ１６を固定する側面部分を傾斜面にすることで保持片１９などを形成するためのスペースを広く取ることができ、保持片１９の製造や保護板２０の着脱作業が容易に行える。
【００２８】
ＦＰＣ１６が背面ケース４に押付けられたとき、ＦＰＣ１６の金属箔１８が金属製の背面ケース４に接触するため、金属箔１８が背面ケース４を介してアースされることになり、ＦＰＣ１６のＥＭＩ対策になる。なお、背面ケース４のアースの仕方は様々な方法があり、例えば各回路基板上に存在するアースラインに接続する構成でもよく、液晶表示装置を大型モニターなどの筐体に取付けたときにアースされる構成でもよい。
【００２９】
この実施形態では、従来は固定されずにフリーになっていたＦＰＣ１６が背面ケース４に固定されるため、組み立て時などにＦＰＣ１６が引っかかったりして破損することを防止する。また、保護板２０は保持片１９に着脱可能になっているため、メンテナンス時にＦＰＣ１６を簡単に取り外すことができ、メンテナンス性が向上する。さらにＦＰＣ１６の収納スペースが少なくなる。この実施形態では固定手段として背面ケース４の一部分を切り起こした保持片１９とプラスチック等の樹脂製の保護板２０を用いるため、安価で簡単に製造することができ、保護板２０の着脱作業も容易に行える。
【００３０】
この実施形態ではＦＰＣ１６のＥＭＩ対策として金属箔１８を貼り付けたが、本発明はこの形態に限定するものではない。例えば、ＦＰＣ１６の全体を金属メッシュで覆い、その金属メッシュを金属製の背面ケース４に接触させるようにしてもよい。また、ＦＰＣ１６に多層ＦＰＣを用い、少なくとも任意の一層に、例えば外層にＦＰＣ１６の大部分に亘ってＧＮＤ（グラウンド）パターンを形成する。そしてこのＧＮＤパターンの一部分を剥き出しにするなどの背面ケース４と導通可能な構成にし、保護板２０でＦＰＣ１６を背面ケース４に保持する際に多層ＦＰＣのＧＮＤパターンと背面ケース４を導通させる方法でもよい。
【００３１】
なお、本発明の要旨を逸脱しない範囲であれば上記実施形態以外の形態も可能である。例えば、保護板を背面ケースにネジ止めする形態でもよく、また背面ケースとは別体に設けた保持片を背面ケースに固定する形態でもよい。また、この実施形態では画素電極に接続するスイッチング素子としてＴＦＴを用いたが、本発明は特にＴＦＴに限定するものではなく、スイッチング素子としてＭＩＭなどを用いても構わない。
【００３２】
【発明の効果】
本発明によれば、液晶パネルに搭載された第１の制御回路基板と背面ケースの裏面に配置された第２の制御回路基板とを接続するフレキシブル基板を、固定手段によって背面ケースに着脱可能に固定するものであり、この固定手段として背面ケースに形成された保持部と、保持部に着脱可能に支持される保護板を備え、保護板を保持部に取付けたときに保護板によってフレキシブル基板を背面ケースに押付けた状態で保持している。従ってフレキシブル基板を簡単に背面ケースに着脱可能に取付けることができ、液晶表示装置の製造中やメンテナンス中のフレキシブル基板の破損を防止でき、組立て作業性が向上し、フレキシブル基板の収納スペースが少なくなる。また、メンテナンス時においてもフレキシブル基板を容易に取外すことができ、メンテナンス性も向上する。
【００３３】
また保持部を背面ケースの一部分を切り起こして形成し、保護板を樹脂製で湾曲可能に形成するため、簡単な構成で安価な固定手段を実現することができ、保護板の着脱作業も容易に行える。
【００３４】
また、フレキシブル基板を背面ケースに固定したときにフレキシブル基板の金属膜が背面ケースの金属部分と導通するため、フレキシブル基板のＥＭＩ対策用の金属膜が背面ケースを介してアースされることになり、フレキシブル基板のＥＭＩ対策が図れる。またＥＭＩ対策用の金属膜としてフレキシブル基板の大部分に亘って貼り合わさせた金属箔を用いるため、簡単な構成で且つ安価にＥＭＩ対策を図ることができる。
【図面の簡単な説明】
【図１】本発明の実施形態である液晶表示装置の背面斜視図である。
【図２】液晶表示装置の前面カバーを取り付けた状態の前面図である。
【図３】液晶表示装置の前面カバーを取り外した状態の前面図である。
【図４】液晶表示装置の側面図である。
【図５】図１の領域Ａの拡大概略図である。
【図６】図４の領域Ｂの拡大概略図である。
【図７】従来の液晶表示装置の背面斜視図である。
【符号の説明】
１ 液晶パネル
２ 前面カバー
３ 枠体
４ 背面ケース
８ ソースＰＷＢ
１４ コントロールＰＷＢ
１６ ＦＰＣ
１９ 保持片
２０ 保護板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device using a direct-type backlight in which a plurality of linear lamps such as fluorescent lamps are arranged directly under a back surface of a liquid crystal panel.
[0002]
[Prior art]
Until now, CRTs have been mainly used for color televisions. Recently, however, liquid crystal televisions have been put into practical use by taking advantage of thin liquid crystal display devices and low power consumption. In a liquid crystal display device for a television or a large monitor, a TFT type LCD using a TFT as a switching element for driving each pixel has become mainstream. In the case of this TFT type, the scanning lines and signal lines connected to the TFTs are formed in a matrix on one glass substrate constituting the liquid crystal panel, and the input terminals for these scanning lines and signal lines are arranged on the peripheral edge of the glass substrate. doing. Since there are generally more signal lines than scanning lines, the input terminals of the signal lines are concentrated on the long side edge of the glass substrate, and the input terminals of the scanning lines are concentrated on the short edge of the glass substrate. . A source driving circuit board is connected to the input terminal of the signal line via TAB, and a gate driving circuit board is connected to the input terminal of the scanning line via TAB, and a signal is supplied from each driving circuit board to each line. . A control circuit board is provided separately from the source drive circuit board and the gate drive circuit board, and the control circuit board and each drive circuit board are electrically connected by a flexible board.
[0003]
Backlights arranged on the back side of the liquid crystal panel include a side edge type in which a linear lamp is arranged on the side surface of the light guide plate and a direct type in which a light source is arranged directly under the back side of the liquid crystal panel. Side-edge type backlights are mainly used for liquid crystal display devices such as notebook computers and small portable terminals because they are particularly thin. However, liquid crystal display devices for liquid crystal televisions and large monitors require particularly high brightness. Mainly direct type backlight is adopted. In the case of the direct type, a plurality of light sources such as fluorescent lamps are arranged on the back side of the liquid crystal panel so as to face the liquid crystal panel, and a diffusion plate, a light control plate, and the like are arranged between the light source and the liquid crystal panel. Fluorescent lamps are housed in a back case made of, for example, Al. However, in the case of the direct type, fluorescent light is supplied in order to prevent uneven brightness by supplying light of uniform intensity to the entire display portion of the liquid crystal panel. It is necessary to adjust the distance between the lamp and the liquid crystal panel, and if the number of fluorescent lamps decreases, the distance between the lamp and the liquid crystal panel will be increased accordingly. It has a shape that protrudes greatly on the back side of the liquid crystal panel. The light from the fluorescent lamp is efficiently supplied to the liquid crystal panel by causing the inner surface of the rear case to act as a reflector, or by disposing a reflector between the rear case and the fluorescent lamp.
[0004]
FIG. 7 is a rear perspective view of the liquid crystal display device. Reference numeral 50 denotes a frame for housing and supporting the liquid crystal panel, 51 is a metal back case, and 52 is a front cover having an open display portion. The frame 50 containing the liquid crystal panel is sandwiched between the back case 51 and the front cover 52, and the fixing portion 53 at the periphery of the front cover 52 is bent toward the back case 51 to be integrated. A control circuit board is attached to the back surface of the back case 51 and covered with a protective case 54. 55 is a flexible board that electrically connects the source drive circuit board attached to the liquid crystal panel and the control circuit board attached to the back case 51, and 56 is an electrical connection between the gate drive circuit board and the control circuit board. It is a flexible board and supplies each signal from the control circuit board.
[0005]
[Problems to be solved by the invention]
Conventionally, the flexible substrates 55 and 56 are left free without being fixed. However, in the case of a liquid crystal display device for a TV or a large monitor, the number of pixels increases with the increase in size and definition, so that the number of signal lines increases, and in particular, the flexible substrate 55 connected to the source drive circuit substrate becomes larger. End up. Therefore, the flexible substrate 55 is easily caught when the liquid crystal display device is handled, and there is a problem that the connection failure or breakage of the flexible substrate 55 occurs.
[0006]
There is also a method of fixing the back case to the flexible substrate with double-sided tape etc. In this case, it is necessary to remove or replace the double-sided tape every time the maintenance of the liquid crystal display device is performed, and there is a disadvantage that the maintainability is poor. It was.
[0007]
Further, in the case of conventional flexible substrates, EMI (Electromagnetic Interference) measures have not been sufficient. Since the liquid crystal display device for TV is large and requires high image quality, EMI countermeasures for the flexible substrate 55, which has become larger with the increase in the number of pixels, have become more important than ever, and there is a need for such countermeasures.
[0008]
Accordingly, an object of the present invention is to propose a liquid crystal display device in which a flexible substrate can be fixed easily and detachably and sufficient EMI countermeasures are taken.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a liquid crystal panel in which liquid crystal is sealed between a pair of substrates and scanning lines and signal lines are arranged in a matrix on one substrate, and a plurality of liquid crystal panels arranged directly below the liquid crystal panel. A liquid crystal display device comprising a light source, a back case that houses the light source and covers the back side of the liquid crystal panel, and a front cover that is disposed on the front surface of the liquid crystal panel and is fixed to the back case is mounted on the liquid crystal panel. The first control circuit board for supplying image signals to the signal lines, the second control circuit board disposed on the back surface of the back case, the first control circuit board, and the second control circuit board. And a fixing means for detachably fixing the flexible board to the back case.
[0010]
Further, the fixing means of the present invention includes a holding portion formed on the back case and a protective plate that is detachably supported by the holding portion, and the flexible substrate is attached to the back surface by the protective plate when the protective plate is attached to the holding portion. It is characterized by being held in a state of being pressed against the case.
[0011]
With the above configuration, the flexible substrate can be easily attached to the rear case, the flexible substrate can be prevented from being damaged during the manufacturing and maintenance of the liquid crystal display device, the assembling workability is improved, and the storage space for the flexible substrate is reduced. . In addition, the flexible substrate can be easily removed during maintenance, and the maintainability is improved.
[0012]
Further, the present invention is characterized in that the holding portion is formed by cutting and raising a part of the back case, and the protective plate is made of resin and bendable. With the above configuration, an inexpensive fixing means can be realized.
[0013]
The present invention also includes a rear case in which at least a portion to which the flexible substrate is pressed is made of metal, and a flexible substrate having a metal film for EMI countermeasures, and the flexible substrate is fixed to the rear case by fixing means. The metal film is electrically connected to the metal portion of the back case.
[0014]
With the above configuration, the metal film for EMI countermeasure of the flexible substrate is grounded via the back case, and the EMI countermeasure of the flexible substrate is taken.
[0015]
In addition, the present invention is characterized in that a metal foil bonded over most of the flexible substrate is used as the metal film for the EMI countermeasure of the flexible substrate. With the above configuration, EMI countermeasures can be taken at low cost.
[0016]
Further, the present invention is characterized in that a metal mesh that covers most of the flexible substrate is used as a metal film for EMI countermeasures of the flexible substrate.
[0017]
In addition, the present invention is characterized in that as a metal film for EMI countermeasures of a flexible substrate, a flexible substrate is made into a multilayer and a GND pattern formed over the single layer is used.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a rear perspective view of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a front view of the liquid crystal display device, FIG. 3 is a front view when a front cover of the liquid crystal display device is removed, and FIG. FIG. 5 is an enlarged schematic view of region A in FIG. 1, and FIG. 6 is an enlarged schematic view of region B in FIG.
[0019]
In the liquid crystal panel 1, a pair of glass substrates 5 and 6 are bonded together in a hollow shape, and liquid crystal is sealed between the glass substrates 5 and 6. A plurality of signal lines and a plurality of scanning lines are formed in a matrix on one glass substrate 5, TFTs are provided at intersections between the signal lines and the scanning lines, and pixel electrodes are provided in regions surrounded by the signal lines and the scanning lines, respectively. Provide. The TFT has a gate electrode connected to the scanning line, a source electrode connected to the signal line, a drain electrode connected to the pixel electrode, and the TFT is turned on / off by a scanning signal supplied to the scanning line and supplied to the signal line. A voltage based on the image signal is supplied to the pixel electrode. On the other glass substrate 6, a light-shielding film is formed at a portion facing the scanning line or the signal line, and a color filter of a predetermined color is formed according to each pixel. A common electrode is formed on the light shielding film and the color filter so as to face the pixel electrode, and the arrangement state of the liquid crystal molecules is controlled by an electric field between the common electrode and the pixel electrode.
[0020]
The glass substrate 5 on which the scanning lines and the signal lines are formed is slightly larger than the glass substrate 6 on which the color filter is formed, and one long side portion of the glass substrate 5 when the glass substrate 5 and the glass substrate 6 are bonded together. And the short side is exposed. A signal line input terminal is disposed on the exposed long side portion, and a scanning line input terminal is disposed on the exposed short side portion. The input terminal of the signal line is connected to the source drive circuit board (hereinafter referred to as source PWB) 8 which is the first control circuit board via the TAB 7, and an image signal is supplied from the source PWB 8 to the signal line. The input terminal is connected to a gate drive circuit board (hereinafter referred to as gate PWB) 10 via TAB 9, and a gate signal is supplied from the gate PWB10 to the scanning line. Both the source PWB 8 and the gate PWB 10 are formed of an elongated rectangular printed board, and each control circuit is arranged on the printed board.
[0021]
Reference numeral 3 denotes a resin frame, which has an opening in the central portion, and is provided with locking portions that are in contact with the side portions of the glass substrate 5 and are positioned at several places. When the liquid crystal panel 1 is placed on the frame body 3, the glass substrate 5 can be brought into contact with the locking portion 11 so that the liquid crystal panel 1 can be held in the frame body 3. The front cover 2 is disposed on the front side of the liquid crystal panel 1 held by the frame 3 and the rear case 4 is disposed on the rear side. The liquid crystal panel 1 and the frame 3 are sandwiched between the front cover 2 and the rear case 4. A liquid crystal display device is configured by fixing.
[0022]
The front cover 2 is formed of a metal such as Al, and a portion corresponding to the display unit of the liquid crystal panel 1 is opened. The peripheral portion of the front cover 2 is bent so as to cover the side surface of the frame body 3, and a fixing portion 12 formed by cutting out a part of the peripheral portion is provided. The front cover 2 can be fixed to the back case 4 by bending the fixing portion 12 to the back case 4 side.
[0023]
In this embodiment, a direct-type backlight is used, and a plurality of light sources such as fluorescent lamps are housed in the back case 4, and the fluorescent lamps are arranged along the longitudinal direction of the liquid crystal panel 1. Reference numeral 13 denotes a lead wire of a fluorescent lamp led to the outside of the back case 4. The back case 4 is made of a metal such as Al, and the inner surface thereof efficiently reflects the light from the fluorescent lamp. A reflector may be disposed between the fluorescent lamp and the back case 4. The shape of the back case 4 protrudes greatly on the back side so that a fluorescent lamp can be stored.
[0024]
A control circuit board (hereinafter referred to as control PWB) 14 as a second control circuit board is disposed on a part of the back surface of the back case 4, and the control PWB 14 is covered with a protective cover 15. The control PWB 14 is provided with a control circuit that supplies each signal to the source PWB 8 and the gate PWB 10. Reference numeral 16 denotes an FPC (flexible substrate) that connects the source PWB 8 and the control PWB 14, and 17 denotes an FPC (flexible substrate) that connects the gate PWB 10 and the control PWB 14. The FPC 17 is not illustrated in FIG. 1 because it is covered with the protective cover 15.
[0025]
The FPC 16 is bifurcated on the control PWB 14 side, and is provided with a wiring pattern for electrically connecting the source PWB 8 and the control PWB 14, such as Al or Cu, which is a metal film for EMI countermeasure that insulates the wiring pattern. The metal foil 18 is affixed to the FPC 16. The hatched portion of the FPC 16 in FIG. The metal foil 18 is formed on most of the surface of the FPC 16 that faces the back case 4 and the surface that does not face the back case 4, and the metal foils 18 on both sides are electrically connected. As for the method of connecting the metal foils 18 on both sides, a method of providing the metal foils 18 on both sides at the end of the FPC 16 or forming a contact hole at an appropriate position of the FPC 16 and electrically connecting the metal foils 18 on both sides at the contact hole part. You may perform the process connected to. In this embodiment, since the metal foil 18 is affixed to the FPC 16, an EMI countermeasure can be achieved with a simple configuration and at a low cost.
[0026]
Reference numeral 19 denotes a holding piece which is a holding portion formed on the back case 4, and 20 denotes a protective plate held by the holding piece 19. The holding piece 19 is formed by cutting and raising a part of the back case 4, and is positioned between both sides of the FPC 16 in the lateral width direction and the two crotch portions of the FPC 16. The protection plate 20 is formed in a horizontally long plate shape made of a resin such as plastic, can be bent with respect to the force applied from the longitudinal direction, and has a restoring force to return to the original shape when the applied force is removed. doing. The protective plate 20 may be formed of metal. However, when using a protective plate made of metal that is inferior in resilience after being bent compared to the protective plate 20 made of resin, the shape of the holding piece 19 or The arrangement needs to be suitable for a metal protective plate. When the protection plate 20 is attached to the holding piece 19, one end of the protection plate 20 is hooked on one holding piece 19 located on the side of the FPC 16, and protection is performed with the FPC 16 interposed between the protection plate 20 and the back case 4. The plate 20 is bent, the other end of the protective plate 20 is inserted into the other holding piece 19 positioned on the side of the FPC 16, and is fitted into the holding piece 19 by the restoring force of the protective plate 20. At this time, the protection plate 20 is supported and fixed by the holding piece 19, and the FPC 16 is attached to the back case 4 by the protection plate 20.
[0027]
In this embodiment, the side surface portion (portion where the FPC is located) of the back case 4 that protrudes largely on the back surface is an inclined surface, and the holding piece 19 is formed on the inclined surface to fix the FPC 16. Therefore, when the FPC 16 is fixed to the rear case 4, the FPC 16 is not deformed into an unreasonable shape, and an extra load is not applied to the protective plate 20 and the holding piece 19 that are pressing the FPC 16. Further, by making the side surface portion for fixing the FPC 16 of the back case 4 into an inclined surface, a space for forming the holding piece 19 and the like can be widened, and the manufacturing of the holding piece 19 and the attaching / detaching work of the protection plate 20 are easy. Can be done.
[0028]
When the FPC 16 is pressed against the back case 4, the metal foil 18 of the FPC 16 comes into contact with the metal back case 4, so that the metal foil 18 is grounded via the back case 4. Become. There are various ways of grounding the back case 4. For example, the back case 4 may be connected to a ground line on each circuit board, and grounded when the liquid crystal display device is attached to a housing such as a large monitor. It may be configured.
[0029]
In this embodiment, since the FPC 16 that has been free without being fixed is fixed to the back case 4, the FPC 16 is prevented from being caught and damaged during assembly or the like. Further, since the protection plate 20 can be attached to and detached from the holding piece 19, the FPC 16 can be easily detached during maintenance, and the maintainability is improved. Further, the storage space for the FPC 16 is reduced. In this embodiment, since the holding piece 19 obtained by cutting and raising a part of the back case 4 and the protective plate 20 made of resin such as plastic are used as fixing means, it can be easily manufactured at low cost, and the protective plate 20 can be attached and detached. Easy to do.
[0030]
In this embodiment, the metal foil 18 is pasted as an EMI countermeasure for the FPC 16, but the present invention is not limited to this embodiment. For example, the entire FPC 16 may be covered with a metal mesh, and the metal mesh may be brought into contact with the metal back case 4. Further, a multilayer FPC is used for the FPC 16, and a GND (ground) pattern is formed on at least an arbitrary layer, for example, on the outer layer over most of the FPC 16. Also, a method of making the back case 4 electrically conductive, such as exposing a part of the GND pattern, and electrically connecting the GND pattern of the multi-layer FPC and the back case 4 when holding the FPC 16 to the back case 4 with the protective plate 20 is also possible. Good.
[0031]
In addition, forms other than the above-described embodiment are possible as long as they do not depart from the gist of the present invention. For example, the protection plate may be screwed to the back case, or the holding piece provided separately from the back case may be fixed to the back case. In this embodiment, the TFT is used as the switching element connected to the pixel electrode. However, the present invention is not particularly limited to the TFT, and an MIM or the like may be used as the switching element.
[0032]
【The invention's effect】
According to the present invention, the flexible substrate that connects the first control circuit board mounted on the liquid crystal panel and the second control circuit board disposed on the back surface of the back case can be attached to and detached from the back case by the fixing means. As the fixing means, a holding part formed on the back case and a protective plate removably supported by the holding part are provided, and when the protective plate is attached to the holding part, the flexible board is attached by the protective plate. It is held in a pressed state on the back case. Therefore, the flexible substrate can be easily attached to the back case in a removable manner, and the flexible substrate can be prevented from being damaged during the manufacturing and maintenance of the liquid crystal display device, the assembling workability is improved, and the storage space for the flexible substrate is reduced. . In addition, the flexible substrate can be easily removed during maintenance, and the maintainability is improved.
[0033]
In addition, the holding part is formed by cutting and raising a part of the back case, and the protective plate is made of resin so that it can be bent, so it is possible to realize an inexpensive fixing means with a simple configuration, and easy attachment and detachment of the protective plate Can be done.
[0034]
In addition, when the flexible substrate is fixed to the back case, the metal film of the flexible substrate is electrically connected to the metal part of the back case, so that the metal film for EMI countermeasure of the flexible substrate is grounded through the back case, Measures against flexible substrate EMI can be achieved. Further, since the metal foil bonded over the most part of the flexible substrate is used as the metal film for EMI countermeasure, the EMI countermeasure can be achieved at a low cost with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a rear perspective view of a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 is a front view of the liquid crystal display device with a front cover attached.
FIG. 3 is a front view of the liquid crystal display device with a front cover removed.
FIG. 4 is a side view of a liquid crystal display device.
FIG. 5 is an enlarged schematic view of a region A in FIG.
6 is an enlarged schematic view of a region B in FIG.
FIG. 7 is a rear perspective view of a conventional liquid crystal display device.
[Explanation of symbols]
1 Liquid Crystal Panel 2 Front Cover 3 Frame 4 Back Case 8 Source PWB
14 Control PWB
16 FPC
19 Holding piece 20 Protection plate

Claims (7)

一対の基板間に液晶を封入すると共に一方の基板に走査線と信号線をマトリクス状に配置した液晶パネルと、前記液晶パネルの直下に配置された複数の光源と、前記光源を収納すると共に前記液晶パネルの裏面側を覆う背面ケースと、前記液晶パネルの前面に配置されると共に前記背面ケースに固定される前面カバーとを備えた液晶表示装置において、前記液晶パネルに搭載されると共に前記信号線に画像信号を供給する第１の制御回路基板と、前記背面ケースの裏面に配置された第２の制御回路基板と、前記第１の制御回路基板と前記第２の制御回路基板とを電気的に接続するフレキシブル基板と、前記フレキシブル基板を前記背面ケースに着脱可能に固定する固定手段を備えたことを特徴とする液晶表示装置。Liquid crystal is sealed between a pair of substrates, and a liquid crystal panel in which scanning lines and signal lines are arranged in a matrix on one substrate, a plurality of light sources arranged immediately below the liquid crystal panel, and the light sources are stored and A liquid crystal display device comprising a back case that covers the back side of a liquid crystal panel, and a front cover that is disposed on the front surface of the liquid crystal panel and is fixed to the back case. Electrically connecting a first control circuit board for supplying image signals to the second control circuit board, a second control circuit board disposed on the back surface of the back case, and the first control circuit board and the second control circuit board. A liquid crystal display device, comprising: a flexible substrate connected to the substrate; and fixing means for detachably fixing the flexible substrate to the back case. 前記固定手段は、前記背面ケースに形成された保持部と、前記保持部に着脱可能に支持される保護板とを備え、前記保護板を前記保持部に取付けたときに前記保護板によって前記フレキシブル基板を前記背面ケースに押付けた状態で保持することを特徴とする請求項１記載の液晶表示装置。The fixing means includes a holding portion formed on the back case and a protective plate that is detachably supported by the holding portion, and the flexible plate allows the flexible plate when the protective plate is attached to the holding portion. The liquid crystal display device according to claim 1, wherein the substrate is held while being pressed against the back case. 前記保持部は前記背面ケースの一部分を切り起こして形成され、前記保護板は樹脂製で湾曲可能に形成されることを特徴とする請求項２記載の液晶表示装置。3. The liquid crystal display device according to claim 2, wherein the holding portion is formed by cutting and raising a part of the back case, and the protective plate is made of resin and bendable. 少なくとも前記フレキシブル基板が押付けられる部分を金属製にした前記背面ケースと、ＥＭＩ対策用の金属膜を有する前記フレキシブル基板とを備え、前記固定手段によって前記フレキシブル基板を前記背面ケースに固定したときに前記フレキシブル基板の金属膜が前記背面ケースの金属部分と導通することを特徴とする請求項１乃至請求項３記載の液晶表示装置。The rear case in which at least a portion to which the flexible substrate is pressed is made of metal, and the flexible substrate having a metal film for EMI countermeasures, and when the flexible substrate is fixed to the rear case by the fixing means, 4. The liquid crystal display device according to claim 1, wherein the metal film of the flexible substrate is electrically connected to the metal portion of the back case. 前記フレキシブル基板のＥＭＩ対策用の金属膜は、前記フレキシブル基板の大部分に亘って貼り合わされた金属箔であることを特徴とする請求項４記載の液晶表示装置。5. The liquid crystal display device according to claim 4, wherein the metal film for EMI countermeasures of the flexible substrate is a metal foil bonded over most of the flexible substrate. 前記フレキシブル基板のＥＭＩ対策用の金属膜は、前記フレキシブル基板の大部分を覆う金属メッシュであることを特徴とする請求項４記載の液晶表示装置。5. The liquid crystal display device according to claim 4, wherein the metal film for EMI countermeasures of the flexible substrate is a metal mesh that covers most of the flexible substrate. 前記フレキシブル基板のＥＭＩ対策用の金属膜は、前記フレキシブル基板を多層にすると共にその一層に亘って形成されたＧＮＤパターンであることを特徴とする請求項４記載の液晶表示装置。5. The liquid crystal display device according to claim 4, wherein the metal film for EMI countermeasures on the flexible substrate is a GND pattern formed on the flexible substrate in multiple layers.
JP2001138797A 2001-05-09 2001-05-09 Liquid crystal display Expired - Fee Related JP3650044B2 (en)

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JP2001138797A JP3650044B2 (en) 2001-05-09 2001-05-09 Liquid crystal display
TW091108473A TWI224293B (en) 2001-05-09 2002-04-24 Display module and display device
PCT/JP2002/004299 WO2002091340A1 (en) 2001-05-09 2002-04-26 Display module and display unit
CNB02809543XA CN1249648C (en) 2001-05-09 2002-04-26 Display module and display unit
EP02722883A EP1387334A4 (en) 2001-05-09 2002-04-26 Display module and display unit
US10/474,195 US7206037B2 (en) 2001-05-09 2002-04-26 Display module and display unit
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