JP2008033361A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
JP2008033361A
JP2008033361A JP2007260655A JP2007260655A JP2008033361A JP 2008033361 A JP2008033361 A JP 2008033361A JP 2007260655 A JP2007260655 A JP 2007260655A JP 2007260655 A JP2007260655 A JP 2007260655A JP 2008033361 A JP2008033361 A JP 2008033361A
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Japan
Prior art keywords
liquid crystal
light diffusing
diffusing plate
crystal panel
disposed
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Granted
Application number
JP2007260655A
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Japanese (ja)
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JP4924349B2 (en
Inventor
Toshiya Nishio
俊哉 西尾
Takuya Nishimoto
拓也 西本
Akio Tanishige
昭男 谷繁
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Seiko Epson Corp
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Seiko Epson Corp
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Priority to JP2007260655A priority Critical patent/JP4924349B2/en
Publication of JP2008033361A publication Critical patent/JP2008033361A/en
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Publication of JP4924349B2 publication Critical patent/JP4924349B2/en
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  • Liquid Crystal (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To lower the costs by decreasing the number of components while effectively supporting a light diffusing plate, a sheet, etc., of a back light and securely preventing them from deforming. <P>SOLUTION: A liquid crystal display device comprising a plurality of straight fluorescent lamps disposed in parallel in a lamp chamber, a reflection plate disposed on the back of the lamp chamber, a plurality of resin-made reflecting materials provided on the reflection plate between fluorescent lamps, the light diffusing plate disposed in front of the fluorescent lamps, and a liquid crystal panel disposed in front of the light diffusing plate is characterized in that support projections supporting the light diffusing plate etc., are integrally formed at a plurality of positions of the reflecting materials closer to corners than to a nearly central part of the liquid crystal panel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、主に１９インチ以上の比較的大型の液晶表示に適した液晶表示装置に関する
ものである。 The present invention relates to a liquid crystal display device suitable mainly for a relatively large liquid crystal display of 19 inches or more.

主に１９インチ以上の比較的大型の液晶パネルで、液晶パネルの背面に直下型の蛍光ラ
ンプを収納配置したランプ室を設け、このランプ室と液晶パネルとの間に光拡散板を配置
したものでは、光拡散板をランプ室の外周縁で支持している為、光拡散板の中央が自重に
より湾曲し、液晶パネルの表示品質等に影響を及ぼすという問題がある。
一方、上記問題点を解消すべく、例えば特開平７−５６１４１号公報や、特開２００１−
２６６６３４号公報に示される様に、拡散板やシートの中心部分とその周囲、或いは液晶
パネルの略全面を複数のピン状支持部材で支持したものがあるが、前者の中心部分のみで
支持する場合、液晶パネルの大型化に伴って荷重が中心に集中して変形し、その周囲に配
置した支持部材が機能しないで輝度むらが発生し易いという問題があり、後者の場合には
、上記前者の問題と併せて支持部材の中で実際に機能している部分は数点であり、無駄と
なる支持部材があるという問題がある。
特開平７−５６１４１号公報 特開２００１−２６６６３４号公報 This is a relatively large liquid crystal panel of 19 inches or more, with a lamp chamber containing a direct fluorescent lamp on the back of the liquid crystal panel, and a light diffusion plate placed between the lamp chamber and the liquid crystal panel. However, since the light diffusing plate is supported by the outer peripheral edge of the lamp chamber, there is a problem that the center of the light diffusing plate is bent by its own weight and affects the display quality of the liquid crystal panel.
On the other hand, in order to solve the above problems, for example, JP-A-7-56141 and JP-A-2001-2001
As shown in US Pat. No. 266634, there are those in which the central portion of the diffusion plate or sheet and its periphery, or substantially the entire surface of the liquid crystal panel is supported by a plurality of pin-shaped support members, but only the former central portion is supported. As the size of the liquid crystal panel increases, there is a problem that the load concentrates on the center and deforms, and the support member disposed around the liquid crystal panel does not function, and brightness unevenness is likely to occur. In the latter case, the former In addition to the problem, there are several portions of the support member that are actually functioning, and there is a problem that there is a useless support member.
Japanese Patent Laid-Open No. 7-56141 JP 2001-266634 A

そこで本発明は、バックライトの光拡散板やシート類を効果的に支持し、これらの変形
を確実に防止すると同時に、部品点数の削減によるコストダウン等を計る事を目的とする
ものである。 Therefore, the present invention aims to effectively support the light diffusing plate and sheets of the backlight, prevent these deformations reliably, and at the same time reduce the cost by reducing the number of parts.

本発明は、ランプ室と、このランプ室内に並列配置した複数の直管状の蛍光ランプと、
ランプ室の背面に配置された反射板と、この反射板上で蛍光ランプ間に各々設けられた複
数の樹脂製反射材と、蛍光ランプの前面に配設した光拡散板と、この光拡散板の前面に配
設した液晶パネルとを備えたものにおいて、反射材の、液晶パネルの略中央部よりコーナ
ー寄りの数箇所に光拡散板等を支持する支持突起を一体的に形成して成るものである。 The present invention includes a lamp chamber and a plurality of straight tubular fluorescent lamps arranged in parallel in the lamp chamber,
A reflector disposed on the back of the lamp chamber, a plurality of resin reflectors provided between the fluorescent lamps on the reflector, a light diffusing plate disposed on the front of the fluorescent lamp, and the light diffusing plate With a liquid crystal panel arranged on the front surface of the reflector, which is formed by integrally forming support projections for supporting a light diffusion plate, etc. at several locations near the corner of the liquid crystal panel from the substantially central portion of the reflector It is.

又本発明は、支持突起を、液晶パネルの対角線を略３等分する位置に形成して成るもの
である。 In the present invention, the support protrusion is formed at a position that divides the diagonal line of the liquid crystal panel into approximately three equal parts.

本発明の構成により、ランプ室に並列配置した複数の蛍光ランプ間に樹脂製の反射材を
配置したものにおいて、この反射材の液晶パネル中央部よりコーナー寄りの数箇所に光拡
散板を支持する支持突起を設けたことで、これら支持部材にて光拡散板等の荷重を略均等
に分散して支持する事が出来、これによりわずかな支持突起で効果的に光拡散板等を支持
し、これらの変形による表示品質の低下を防止する事が出来るものである。 According to the configuration of the present invention, in the case where a resin reflective material is arranged between a plurality of fluorescent lamps arranged in parallel in the lamp chamber, the light diffusing plate is supported at several locations closer to the corner than the central portion of the liquid crystal panel of the reflective material. By providing the support protrusion, it is possible to support the light diffusing plate and the like by distributing the load almost uniformly by these supporting members, thereby effectively supporting the light diffusing plate and the like with a few supporting protrusions, It is possible to prevent deterioration in display quality due to these deformations.

又本発明の構成により、支持突起を液晶パネルの対角線を略３等分する位置に形成した
ことで、光拡散板等のたわみ量が略等しい位置にてこれらを確実に支持し、支持部材が受
ける荷重を略均等に分散し、支持荷重の片寄りによる光拡散板等の変形を防止する事が出
来るものである。 In addition, with the configuration of the present invention, the support protrusions are formed at positions that divide the diagonal line of the liquid crystal panel into approximately three equal parts, so that they are reliably supported at positions where the deflection amount of the light diffusing plate or the like is approximately equal. It is possible to disperse the received load substantially evenly and prevent deformation of the light diffusing plate or the like due to the deviation of the support load.

本発明の実施例を先ず図１に基づき説明すると、１は例えば１９インチ以上の比較的大
型で横長の液晶表示装置で、バックライト装置２の前面に、大画面に適したＳＴＮ液晶パ
ネルやＴＦＴ液晶パネルにて構成した液晶表示器３を連結して構成している。 An embodiment of the present invention will be described first with reference to FIG. 1. Reference numeral 1 denotes a relatively large and horizontally long liquid crystal display device of, for example, 19 inches or more, and an STN liquid crystal panel or TFT suitable for a large screen on the front surface of the backlight device 2. A liquid crystal display 3 constituted by a liquid crystal panel is connected.

一方、上記バックライト装置２は、図２にても示す様に、有底箱状の底ケース４の開口
部５に、板厚が２〜３ｍｍ程度でアクリルやポリカーボネート等の透光性樹脂からなる光
拡散板６を配置していると共に、この光拡散板の前面に集光性シート７・・等を積層した
シート類を配置して構成している。 On the other hand, as shown in FIG. 2, the backlight device 2 is made of a transparent resin such as acrylic or polycarbonate having a thickness of about 2 to 3 mm in the opening 5 of the bottom case 4 having a bottomed box shape. The light diffusing plate 6 is arranged, and the light diffusing plate 6 is arranged on the front surface of the light diffusing plate.

又、上記底ケース４の開口部５口縁には、該部を外側に向けて折曲して鍔部８を一体形
成し、この鍔部に上記光拡散板６等の外周縁を載置していると共に、上記鍔部８に板金を
略Ｌ字状に折曲成形したセンターシャーシ９をビス１０留めし、このセンターシャーシの
上片１１と上記鍔部８により、上記光拡散板６やシート類を固定している。 In addition, a flange 8 is integrally formed at the opening 5 mouth edge of the bottom case 4 by bending the portion outward, and the outer peripheral edge of the light diffusion plate 6 and the like is placed on the flange. In addition, a center chassis 9 formed by bending a sheet metal into a substantially L-shape is fastened to the flange portion 8 with screws 10, and the light diffusion plate 6 and the center piece 11 and the flange portion 8 are Sheets are fixed.

更に上記液晶表示器３は、２枚の透明電極付きガラス基板１２，１２の間に液晶を封入
し、かつこれらガラス基板の前後に偏向板や位相差板等の光学シート１３，１３を配置し
て構成した液晶パネル１４を、上記センターシャーシ９の上片１１の前面に載置し、そし
て、断面略Ｌ字状で金属性薄板の成形品から成る外枠１５を上記センターシャーシ９にビ
ス１６・・止めすることで、センターシャーシ９の上片１１と外枠１５の前辺１７との間
に液晶パネル１４を固定して構成している。 Further, the liquid crystal display 3 encloses liquid crystal between two glass substrates 12 and 12 with transparent electrodes, and optical sheets 13 and 13 such as a deflector plate and a phase difference plate are arranged before and after these glass substrates. The liquid crystal panel 14 configured as described above is placed on the front surface of the upper piece 11 of the center chassis 9, and an outer frame 15 made of a molded metal thin plate having a substantially L-shaped cross section is attached to the center chassis 9 with screws 16. The liquid crystal panel 14 is fixed between the upper piece 11 of the center chassis 9 and the front side 17 of the outer frame 15 by being stopped.

又、上記底ケース４の内部にはランプ室１８を区画形成していると共に、底ケース４の
内面には、内表面を光反射率の高い白色系に着色した反射板１９を配置し、かつ上記ラン
プ室１８内部には、冷陰極蛍光管や熱陰極蛍光管等から成る複数の蛍光ランプ２０・・を
横並びにて、所謂直下型に収納配置している。 In addition, a lamp chamber 18 is defined in the inside of the bottom case 4, and on the inner surface of the bottom case 4, a reflector 19 whose inner surface is colored white with high light reflectance is disposed, and Inside the lamp chamber 18, a plurality of fluorescent lamps 20... Composed of cold cathode fluorescent tubes, hot cathode fluorescent tubes and the like are accommodated in a so-called direct type.

一方、上記反射板１９の底面上には図３にても示す様に上記蛍光ランプ２０・・間に位
置して、ポリカーボネート等の樹脂材にて成形した断面が三角形状の複数のリフレクタ２
１・・を所定の間隔を置いて並列配置し、これらを背面よりビス２２・・固定し、蛍光ラ
ンプ２０・・から放射された光を光拡散板６に向けて反射する様に構成している。尚、上
記リフレクタ２１・・の材質に高反射グレードを用いることで、液晶パネル１４の輝度を
向上する事ができる。 On the other hand, on the bottom surface of the reflector 19, as shown in FIG. 3, a plurality of reflectors 2 which are located between the fluorescent lamps 20 and formed of a resin material such as polycarbonate have a triangular shape.
1 are arranged in parallel at a predetermined interval, and these are fixed by screws 22 from the back, so that the light emitted from the fluorescent lamps 20 is reflected toward the light diffusion plate 6. Yes. In addition, the brightness | luminance of the liquid crystal panel 14 can be improved by using a highly reflective grade for the material of the said reflectors 21 ....

又、上記リフレクタ２１・・には、図４にても示す様に、上記底ケース４の開口部５の
対角線２３，２３を略３等分する位置に近接する４箇所に、先端を上記光拡散板６の背面
に当接してこれを支持するピン状の支持突起２４・・を一体的に突出形成している。 Further, as shown in FIG. 4, the reflectors 21... Have tips at the four points close to the position where the diagonal lines 23 and 23 of the opening 5 of the bottom case 4 are divided into approximately three equal parts. Pin-like support protrusions 24 are formed so as to protrude integrally with the back surface of the diffusion plate 6 to support it.

更に、上記反射板１９のリフレクタ２１・・取付け位置には抜き孔２５・・を穿孔する
と共に、これに対向位置して底ケース４に座押し２６・・を一体に折曲形成し、これら座
押し部分にて上記ビス２２・・固定を行っている。これにより、座押し２６・・にてリフ
レクタ２１・・の位置決めを簡単かつ確実に行う事が出来ると共に、ビス２２・・の締め
付けにより発生する応力による反射板１９の変形を防止し、変形による乱反射による液晶
パネル１４の輝度むら等を防止出来るものである。 Further, the reflector 21 of the reflection plate 19 is provided with a punch hole 25 at the mounting position, and a seat push 26.. The screw 22 is fixed at the pushing portion. This makes it possible to easily and reliably position the reflectors 21 with the seat pushers 26... And prevents the reflection plate 19 from being deformed by the stress generated by tightening the screws 22. This can prevent unevenness of the brightness of the liquid crystal panel 14 due to the above.

上記支持突起２４・・にて、光拡散板６や集光性シート７・・等のシート類を支持する
ことで、これらのたわみ量が略等しい位置にて、光拡散板６等の荷重を略均等に分散させ
て支持突起２４・・にて効率的に支持する事ができ、支持個所の削減に伴う部品点数の削
減によるコストダウンを計る事が出来ると同時に、光拡散板６等の変形による表示品質の
低下等を防止する事が出来るものである。 By supporting the light diffusing plate 6 and the light collecting sheet 7 with the support protrusions 24, etc., the load of the light diffusing plate 6 and the like is applied at a position where the amount of deflection is substantially equal. It is possible to disperse substantially evenly and support efficiently by the support protrusions 24 .. It is possible to reduce costs by reducing the number of parts associated with the reduction of the support points, and at the same time, deformation of the light diffusion plate 6 and the like. It is possible to prevent the display quality from being deteriorated due to.

尚、上記実施例にて示す支持突起２４・・の位置はこれに限定されるものではなく、液
晶パネル１４の大きさ等に応じて適宜設定すれば良い。又、上記実施例では支持突起２４
・・をリフレクタ２１・・に一体成形しているが、これに限定されることなく、例えばリ
フレクタ２１・・の支持突起２４・・形成部分に取付孔を穿孔し、別部材として成形した
支持突起２４・・をビスや接着剤で固定しても良い。index4index4 The positions of the support protrusions 24 in the above embodiment are not limited to this, and may be set as appropriate according to the size of the liquid crystal panel 14 and the like. In the above embodiment, the support protrusion 24 is used.
.. Are integrally formed with the reflector 21... However, the present invention is not limited to this. For example, the support protrusion 24 of the reflector 21... 24 may be fixed with screws or an adhesive. index4index4

本発明による実施例を示す分解斜視図である。It is a disassembled perspective view which shows the Example by this invention. 同じく要部の側面縦断面図である。It is side surface longitudinal cross-sectional view of the principal part. 同じく要部の側面縦断面図である。It is side surface longitudinal cross-sectional view of the principal part. 同じくバックライト装置の平面図である。It is a top view of a backlight device similarly.

符号の説明Explanation of symbols

６ 光拡散板
１４ 液晶パネル
１８ ランプ室
１９ 反射板
２０ 蛍光ランプ
２１ 反射材
２４ 支持突起 6 Light diffusing plate 14 Liquid crystal panel 18 Lamp chamber 19 Reflecting plate 20 Fluorescent lamp 21 Reflecting material 24 Support protrusion

Claims (2)

ランプ室と、このランプ室内に並列配置した複数の直管状の蛍光ランプと、上記ランプ
室の背面に配置された反射板と、この反射板上で上記蛍光ランプ間に各々設けられた複数
の樹脂製反射材と、上記蛍光ランプの前面に配設した光拡散板と、この光拡散板の前面に
配設した液晶パネルとを備えたものにおいて、上記反射材の、上記液晶パネルの略中央部
よりコーナー寄りの数箇所に上記光拡散板等を支持する支持突起を一体的に形成した事を
特徴とする液晶表示装置。 A lamp chamber; a plurality of straight tubular fluorescent lamps arranged in parallel in the lamp chamber; a reflector disposed on the back of the lamp chamber; and a plurality of resins provided between the fluorescent lamps on the reflector. A reflection member, a light diffusing plate disposed on the front surface of the fluorescent lamp, and a liquid crystal panel disposed on the front surface of the light diffusing plate. A liquid crystal display device characterized in that support protrusions for supporting the light diffusing plate and the like are integrally formed at several positions closer to the corner. 上記支持突起を、液晶パネルの対角線を略３等分する位置に形成した事を特徴とする、
上記請求項１に記載の液晶表示装置。
index3index3 The support protrusion is formed at a position that divides the diagonal line of the liquid crystal panel into approximately three equal parts,
The liquid crystal display device according to claim 1.
index3index3
JP2007260655A 2007-10-04 2007-10-04 Liquid crystal display Expired - Fee Related JP4924349B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007260655A JP4924349B2 (en) 2007-10-04 2007-10-04 Liquid crystal display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007260655A JP4924349B2 (en) 2007-10-04 2007-10-04 Liquid crystal display

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2002165031A Division JP4147824B2 (en) 2002-06-06 2002-06-06 Liquid crystal display

Related Child Applications (2)

Application Number Title Priority Date Filing Date
JP2010275687A Division JP5088714B2 (en) 2010-12-10 2010-12-10 Liquid crystal display
JP2010275686A Division JP5088713B2 (en) 2010-12-10 2010-12-10 Liquid crystal display

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JP2008033361A true JP2008033361A (en) 2008-02-14
JP4924349B2 JP4924349B2 (en) 2012-04-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8238516B2 (en) 2008-01-09 2012-08-07 Kabushiki Kaisha Toshiba Radiotherapy support apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05119316A (en) * 1991-10-25 1993-05-18 Canon Inc Back light device
JPH05119313A (en) * 1991-10-24 1993-05-18 Nec Corp Back light
JPH05257142A (en) * 1992-03-12 1993-10-08 Hitachi Ltd Liquid crystal display device
JPH0695105A (en) * 1991-01-21 1994-04-08 Toshiba Corp Back light for liquid crystal module
JPH0764084A (en) * 1993-08-31 1995-03-10 Toshiba Lighting & Technol Corp Illumination device, liquid crystal display device, back light and display device
JPH10326517A (en) * 1997-05-23 1998-12-08 Tama Electric Co Ltd Back surface lighting device
JP2001210126A (en) * 2000-01-31 2001-08-03 Sharp Corp Lamp holder and back light device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0695105A (en) * 1991-01-21 1994-04-08 Toshiba Corp Back light for liquid crystal module
JPH05119313A (en) * 1991-10-24 1993-05-18 Nec Corp Back light
JPH05119316A (en) * 1991-10-25 1993-05-18 Canon Inc Back light device
JPH05257142A (en) * 1992-03-12 1993-10-08 Hitachi Ltd Liquid crystal display device
JPH0764084A (en) * 1993-08-31 1995-03-10 Toshiba Lighting & Technol Corp Illumination device, liquid crystal display device, back light and display device
JPH10326517A (en) * 1997-05-23 1998-12-08 Tama Electric Co Ltd Back surface lighting device
JP2001210126A (en) * 2000-01-31 2001-08-03 Sharp Corp Lamp holder and back light device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8238516B2 (en) 2008-01-09 2012-08-07 Kabushiki Kaisha Toshiba Radiotherapy support apparatus

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