JP2005203164A - Backlight unit for liquid crystal display device - Google Patents

Backlight unit for liquid crystal display device Download PDF

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Publication number
JP2005203164A
JP2005203164A JP2004006488A JP2004006488A JP2005203164A JP 2005203164 A JP2005203164 A JP 2005203164A JP 2004006488 A JP2004006488 A JP 2004006488A JP 2004006488 A JP2004006488 A JP 2004006488A JP 2005203164 A JP2005203164 A JP 2005203164A
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liquid crystal
crystal display
display device
backlight unit
flat lamp
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JP4066053B2 (en
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Katsumi Yamamoto
勝実 山本
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PROGRESS KK
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PROGRESS KK
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Priority to JP2004006488A priority Critical patent/JP4066053B2/en
Priority to TW093124874A priority patent/TW200530705A/en
Priority to KR1020040070598A priority patent/KR20050074886A/en
Priority to CNA2004100797509A priority patent/CN1641442A/en
Publication of JP2005203164A publication Critical patent/JP2005203164A/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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133567—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the back side

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backlight unit for a liquid crystal display device in which the lack or unevenness of illumination does not occur even in the case of a large-sized liquid crystal display device, and which prevents a light diffusion member by the own weight of the light diffusion member or a heat generated from a surface emitting flat lamp, can illuminate in a high quality level, has the small number of components, and can reduce a manufacturing cost without requiring a time and effort in manufacturing by a simple structure. <P>SOLUTION: The backlight unit for the liquid crystal device includes the surface emitting flat lamp 1 used as a light source, and an air layer 2 formed between the flat lamp 1 and the light diffusion member 3. The light diffusion member 3 is supported by a supporting member 4 from the back surface side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、液晶表示装置用バックライトユニットに関し、特に、光源に面発光フラットランプを使用した液晶表示装置用バックライトユニットに関するものである。   The present invention relates to a backlight unit for a liquid crystal display device, and more particularly to a backlight unit for a liquid crystal display device using a surface emitting flat lamp as a light source.

近年、テレビやコンピュータの薄型の表示装置として、バックライト機構を備えた液晶表示装置が用いられている。   In recent years, liquid crystal display devices having a backlight mechanism have been used as thin display devices for televisions and computers.

ところで、従来、この種の液晶表示装置において用いられるバックライト機構としては、図７〜図８に示すように、透光性を有する導光板１０１の端部に、蛍光管のような線状光源１０４を併設するエッジライト方式が汎用されている（特許文献１参照）。
そして、このエッジライト方式の場合、通常は、導光板１０１の背面側に導光板１０１の材料よりも屈折率が大きい光拡散物質１０６を部分的に被覆し、その面のほぼ全面を光反射層１０３で覆い、導光板１０１の表面側に光拡散性の板又はシートを配置して光拡散層１０２を形成するようにしている。
しかしながら、液晶表示装置の大型化に伴い、エッジライト方式では、照度の不足、不均一が生じるほか、周辺に蛍光管のような線状光源を配設するため装置をコンパクト化できないという問題があった。
また、これに対処するため、光拡散部材の背面側に蛍光管のような線状光源を配設するようにした直下方式のバックライトも提案されている（特許文献２参照）が、特に大型の液晶表示装置の場合、照度の不足、不均一が生じないようにするために、多数の線状光源を配設するとともに、線状光源に対応してレンズフィルム等を配設する必要があり、これが、部品点数の増大や構造が複雑化して製造に手数を要し、製造コストが上昇するという問題があった。
特開平６−９５１０７号公報 特開平１１−２４５８３号公報 Conventionally, as a backlight mechanism used in this type of liquid crystal display device, as shown in FIGS. 7 to 8, a linear light source such as a fluorescent tube is provided at the end of a light-transmitting light guide plate 101. An edge light system with 104 is widely used (see Patent Document 1).
In the case of this edge light system, normally, the light diffusion material 106 having a refractive index larger than that of the material of the light guide plate 101 is partially covered on the back side of the light guide plate 101, and almost the entire surface is covered with the light reflecting layer. 103, and a light diffusing plate or sheet is disposed on the surface side of the light guide plate 101 to form the light diffusing layer 102.
However, along with the increase in the size of liquid crystal display devices, the edge light system has problems such as insufficient and uneven illuminance and the fact that a linear light source such as a fluorescent tube is provided around the device, making it impossible to make the device compact. It was.
In order to cope with this, a direct-type backlight in which a linear light source such as a fluorescent tube is disposed on the back side of the light diffusing member has been proposed (see Patent Document 2). In the case of liquid crystal display devices, it is necessary to provide a large number of linear light sources and a lens film or the like corresponding to the linear light sources in order to prevent insufficient and uneven illumination. However, this has a problem that the number of parts is increased and the structure is complicated, which requires a lot of manufac- turing and increases the manufacturing cost.
JP-A-6-95107 Japanese Patent Laid-Open No. 11-24583

本発明は、上記従来のバックライト機構の有する問題点に鑑み、光源に面発光フラットランプを使用することにより、大型の液晶表示装置の場合でも、照度の不足、不均一が生じないようにするとともに、光拡散部材の自重やフラットランプから発生する熱による光拡散部材の変形（撓み）を防止し、高品位の照明を行うことができ、かつ、部品点数が少なく、構造が簡易で製造に手数を要さず、製造コストを低廉にできる液晶表示装置用バックライトユニットを提供することを目的とする。   In view of the above-described problems of the conventional backlight mechanism, the present invention uses a surface-emitting flat lamp as a light source so that insufficient illuminance and non-uniformity do not occur even in the case of a large liquid crystal display device. In addition, the light diffusion member can be prevented from being deformed (bent) due to its own weight or heat generated from the flat lamp, and high-quality illumination can be performed. An object of the present invention is to provide a backlight unit for a liquid crystal display device that can be manufactured at a low cost without requiring any labor.

上記目的を達成するため、本発明の液晶表示装置用バックライトユニットは、光源に面発光フラットランプを使用した液晶表示装置用バックライトユニットにおいて、フラットランプと光拡散部材との間に空気層を形成するとともに、前記光拡散部材を背面側から支持部材により支持するようにしたことを特徴とする。   In order to achieve the above object, a backlight unit for a liquid crystal display device of the present invention is a backlight unit for a liquid crystal display device using a surface emitting flat lamp as a light source, and an air layer is provided between the flat lamp and the light diffusing member. In addition, the light diffusing member is supported by a supporting member from the back side.

この場合において、支持部材を面発光フラットランプの表面に配設することができる。   In this case, the support member can be disposed on the surface of the surface emitting flat lamp.

また、支持部材を透明又は半透明の合成樹脂材料で形成することができる。   Further, the support member can be formed of a transparent or translucent synthetic resin material.

また、支持部材の頂点で光拡散部材を面状に支持するようにしたり、線状又は点状に支持するようにすることができる。   Further, the light diffusing member can be supported in a planar shape at the apex of the supporting member, or can be supported in a linear shape or a dot shape.

さらに、面発光フラットランプと光拡散部材との間隔を保持する外周フレームの内周面を背面側から表面側に向けて拡開する傾斜面に形成することができる。   Furthermore, the inner peripheral surface of the outer peripheral frame that maintains the distance between the surface-emitting flat lamp and the light diffusing member can be formed as an inclined surface that expands from the back side toward the front side.

本発明の液晶表示装置用バックライトユニットによれば、光源に面発光フラットランプを使用しているので、大型の液晶表示装置の場合でも、照度の不足、不均一が生じないようにすることができる。
また、面発光フラットランプと光拡散部材との間に空気層を形成するとともに、光拡散部材を背面側から支持部材により支持するようにしているので、光拡散部材の自重やフラットランプから発生する熱による光拡散部材の変形（撓み）を防止することができ、光源にフラットランプを使用したことと相俟って、高品位の照明を行うことができ、かつ、部品点数が少なく、構造が簡易で製造に手数を要さず、製造コストを低廉にできる。 According to the backlight unit for a liquid crystal display device of the present invention, since a surface emitting flat lamp is used as a light source, it is possible to prevent insufficient and uneven illuminance even in the case of a large liquid crystal display device. it can.
In addition, an air layer is formed between the surface emitting flat lamp and the light diffusing member, and the light diffusing member is supported by the supporting member from the back side, so that it is generated from the weight of the light diffusing member or the flat lamp. The deformation (bending) of the light diffusing member due to heat can be prevented, combined with the use of a flat lamp as the light source, high-quality illumination can be performed, the number of parts is small, and the structure It is simple and does not require labor, and can be manufactured at low cost.

また、支持部材を面発光フラットランプの表面に配設することにより、支持部材をフラットランプの形状等に拘束されることなく、任意の位置に配設することが可能となり、光拡散部材を支持部材により確実に支持することができる。   Further, by disposing the support member on the surface of the surface emitting flat lamp, the support member can be disposed at any position without being constrained by the shape of the flat lamp, and the light diffusion member is supported. It can be reliably supported by the member.

また、支持部材を透明又は半透明の合成樹脂材料で形成することにより、支持部材による照度の不均一が生じないようにすることができる。   In addition, by forming the support member with a transparent or translucent synthetic resin material, it is possible to prevent unevenness in illuminance due to the support member.

また、支持部材の頂点で光拡散部材を面状に支持するようにすることにより、支持部材による光拡散部材の支持面積を大きく取って光拡散部材をより確実に支持することができ、一方、支持部材の頂点で光拡散部材を線状又は点状に支持するようにすることにより、支持部材による照度の不均一が一層生じないようにすることができる。   In addition, by supporting the light diffusing member in a planar shape at the apex of the supporting member, the light diffusing member can be supported more reliably by taking a large support area of the light diffusing member by the supporting member, By supporting the light diffusing member linearly or in the form of dots at the apex of the supporting member, it is possible to further prevent unevenness in illuminance due to the supporting member.

さらに、面発光フラットランプと光拡散部材との間隔を保持する外周フレームの内周面を背面側から表面側に向けて拡開する傾斜面に形成することにより、フラットランプの有効照射面積を実質的に拡大することができ、装置をコンパクト化できる。   Furthermore, by forming the inner peripheral surface of the outer peripheral frame that keeps the distance between the surface emitting flat lamp and the light diffusing member into an inclined surface that expands from the back side to the front side, the effective irradiation area of the flat lamp is substantially reduced. The size of the apparatus can be reduced.

以下、本発明の液晶表示装置用バックライトユニットの実施の形態を、図面に基づいて説明する。   Hereinafter, embodiments of a backlight unit for a liquid crystal display device of the present invention will be described with reference to the drawings.

図１〜図６に、本発明の液晶表示装置用バックライトユニットの一実施例を示す。
この液晶表示装置用バックライトユニットは、光源として面状光源、具体的には、図６に示すような蛍光管からなる面発光フラットランプ１を使用し、このフラットランプ１と光拡散部材３との間に空気層２を形成するとともに、光拡散部材３を背面側から支持部材４により支持するように構成している。
なお、面発光フラットランプ１は、液晶表示装置用バックライトユニットの形状に応じて、１枚又は適宜枚数のフラットランプ１を組み合わせて用いるようにする。 1 to 6 show an embodiment of a backlight unit for a liquid crystal display device of the present invention.
The backlight unit for a liquid crystal display device uses a planar light source as a light source, specifically, a surface emitting flat lamp 1 made of a fluorescent tube as shown in FIG. The air layer 2 is formed between them, and the light diffusion member 3 is supported by the support member 4 from the back side.
In addition, the surface emitting flat lamp 1 is used by combining one or a suitable number of flat lamps 1 according to the shape of the backlight unit for the liquid crystal display device.

この場合において、支持部材４は、図１に示すように、面発光フラットランプ１の表面（図６に示すような蛍光管からなるフラットランプ１は、いずれの面を表面側にすることができるが、本実施例に示すように、凹凸のある側を表面側にすることにより、照度の不均一が生じないようにすることができる。）に配設することができる。この場合、支持部材４は、面発光フラットランプ１の表面に接触するようにしても、接触しないようにしてもよい。
支持部材４の形状及び材質は、特に限定されるものではないが、例えば、本実施例に示すように、断面形状が矩形のリブ状に形成することにより、支持部材４による光拡散部材３の支持面積を大きく取って光拡散部材３をより確実に支持することができる。
そして、断面形状が矩形のリブ状に形成した支持部材４は、数ｃｍ〜数十ｃｍ、より好ましくは、数ｃｍ〜十数ｃｍ程度の間隔をあけて、等間隔に平行又は格子状に配設するようにする。
なお、支持部材４は、その端部を、面発光フラットランプ１と光拡散部材３との間隔を保持するために配設した外周フレーム５に嵌合等することにより、支持するようにする。
このように、支持部材４を面発光フラットランプ１の表面に配設することにより、支持部材４をフラットランプ１の形状等に拘束されることなく、任意の位置に配設することが可能となり、光拡散部材３を支持部材４により確実に支持することができる。 In this case, as shown in FIG. 1, the support member 4 has the surface of the surface emitting flat lamp 1 (the flat lamp 1 made of a fluorescent tube as shown in FIG. 6 can have any surface on the surface side. However, as shown in the present embodiment, it is possible to prevent uneven illumination from occurring by setting the uneven side to the front side. In this case, the support member 4 may be in contact with the surface of the surface emitting flat lamp 1 or not.
The shape and material of the support member 4 are not particularly limited. For example, as shown in the present embodiment, the support member 4 has a rectangular rib shape so that the light diffusing member 3 is supported by the support member 4. The light diffusing member 3 can be supported more reliably by taking a large support area.
The support members 4 formed in a rib shape having a rectangular cross-sectional shape are arranged in parallel or in a lattice shape at equal intervals with an interval of several centimeters to several tens of centimeters, more preferably several centimeters to several tens of centimeters. To set up.
The support member 4 is supported by fitting or the like to the outer peripheral frame 5 disposed to maintain the distance between the surface emitting flat lamp 1 and the light diffusing member 3.
As described above, by disposing the support member 4 on the surface of the surface emitting flat lamp 1, the support member 4 can be disposed at any position without being restricted by the shape of the flat lamp 1 or the like. The light diffusion member 3 can be reliably supported by the support member 4.

上記のように、支持部材４は、面発光フラットランプ１の表面に配設することができるが、このほか、図３に示すように、面発光フラットランプ１の端部（隣接するフラットランプ１間）に配設することもでき、さらに、図４に示すように、必要に応じて、これらの配設方法を併用することもできる。
なお、この場合、支持部材４は、面発光フラットランプ１の背面側に配設した背面板７によって支持することができる。 As described above, the support member 4 can be disposed on the surface of the surface emitting flat lamp 1, but in addition to this, as shown in FIG. Further, as shown in FIG. 4, these arrangement methods can be used in combination as required.
In this case, the support member 4 can be supported by the back plate 7 disposed on the back side of the surface emitting flat lamp 1.

支持部材４は、透明又は半透明の合成樹脂材料、具体的には、透明性及び耐熱性のあるアクリル樹脂、ポリカーボネート樹脂等で形成することが好ましく、これにより、支持部材４による照度の不均一が生じないようにすることができる。なお、支持部材４を、不透明の合成樹脂材料又は金属材料で形成することもできる。   The support member 4 is preferably formed of a transparent or translucent synthetic resin material, specifically, a transparent and heat-resistant acrylic resin, polycarbonate resin, or the like. Can be prevented from occurring. The support member 4 can also be formed of an opaque synthetic resin material or metal material.

また、支持部材４の形状は、本実施例においては、断面形状が矩形のリブ状に形成したが、このほか、図５に示すように、略三角形（二等辺三角形）に形成したり、頂点を曲面形状に形成したり、凸状に形成したり、さらには、ピン状に形成する等、任意の形状に形成することができ、これにより、支持部材４の頂点での光拡散部材３の支持形態を面状のほか、線状又は点状にすることができる。そして、支持部材４の頂点で光拡散部材３を面状に支持するようにすることにより、支持部材４による光拡散部材３の支持面積を大きく取って光拡散部材３をより確実に支持することができ、一方、支持部材４の頂点で光拡散部材３を線状又は点状に支持するようにすることにより、支持部材４による照度の不均一が一層生じないようにすることができる。   In addition, in the present embodiment, the shape of the support member 4 is a rib having a rectangular cross-section, but in addition to this, as shown in FIG. Can be formed into an arbitrary shape, such as a curved surface shape, a convex shape, or a pin shape, whereby the light diffusion member 3 at the apex of the support member 4 can be formed. The support form can be a line shape or a dot shape in addition to a planar shape. Then, by supporting the light diffusing member 3 in a planar shape at the apex of the support member 4, the support area of the light diffusing member 3 by the support member 4 can be increased to support the light diffusing member 3 more reliably. On the other hand, by supporting the light diffusing member 3 linearly or in the form of dots at the apex of the support member 4, it is possible to further prevent unevenness in illuminance due to the support member 4.

さらに、本実施例においては、面発光フラットランプ１と光拡散部材３との間隔を保持する外周フレーム５の内周面５１を背面側から表面側に向けて拡開する傾斜面に形成するようにしている。
これにより、面発光フラットランプ１の有効照射面積を実質的に拡大することができ、装置をコンパクト化できる。 Furthermore, in the present embodiment, the inner peripheral surface 51 of the outer peripheral frame 5 that holds the distance between the surface emitting flat lamp 1 and the light diffusing member 3 is formed on an inclined surface that expands from the back side toward the front side. I have to.
Thereby, the effective irradiation area of the surface emitting flat lamp 1 can be substantially enlarged, and the apparatus can be made compact.

そして、この液晶表示装置用バックライトユニットは、より具体的には、光源としての面発光フラットランプ１の表面側に、空気層２を介して、支持部材４及び外周フレーム５によって支持される光拡散板３１及び光拡散シート３２からなる光拡散部材３（光拡散部材３を構成する光拡散板３１及び光拡散シート３２の層構成は、任意であり、例えば、光拡散シート３２を複数枚の光拡散シートで構成することができる。）を配設し、これらを本体フレーム８と押さえ枠９とにより挟持し、本体フレーム８と押さえ枠９の係合部８１、９１を係合させることにより、一体化するようにする。なお、本体フレーム８と押さえ枠９との固定は、ビス等により行うこともできる。
この際、面発光フラットランプ１の端部１１と本体フレーム８との間に、クッション性を有するスペーサー１０を介在させるようにする。
このように、液晶表示装置用バックライトユニットの構成部材を、本体フレーム８と押さえ枠９とにより挟持、一体化するようにすることにより、バックライトユニットの組み立てを簡易に行うことができるとともに、バックライトユニットを半製品で輸送、保管等することが可能となり、液晶表示装置の製造工程の自由度が高まり、製造コストを低廉化できる。
そして、光拡散部材３の表面側に、液晶パネルＰを、面発光フラットランプ１の背面側に、光反射シート６及び背面板７を、それぞれ配設し、外周面をトップカバー１２によって覆って全体を一体化するようにする。
なお、外周フレーム５、本体フレーム８、押さえ枠９、トップカバー１２等は、合成樹脂材料又は金属材料で形成することができる。 More specifically, the backlight unit for a liquid crystal display device is light supported by the support member 4 and the outer peripheral frame 5 via the air layer 2 on the surface side of the surface emitting flat lamp 1 as a light source. The light diffusing member 3 composed of the diffusing plate 31 and the light diffusing sheet 32 (the layer configuration of the light diffusing plate 31 and the light diffusing sheet 32 constituting the light diffusing member 3 is arbitrary, for example, the light diffusing sheet 32 is made up of a plurality of sheets. By disposing the light diffusion sheet between the main body frame 8 and the presser frame 9 and engaging the engaging portions 81 and 91 of the main body frame 8 and the presser frame 9 with each other. , So that they are integrated. The main body frame 8 and the holding frame 9 can be fixed with screws or the like.
At this time, a spacer 10 having cushioning properties is interposed between the end portion 11 of the surface emitting flat lamp 1 and the main body frame 8.
Thus, by assembling and integrating the constituent members of the backlight unit for a liquid crystal display device between the main body frame 8 and the holding frame 9, the backlight unit can be easily assembled, The backlight unit can be transported and stored as a semi-finished product, the degree of freedom in the manufacturing process of the liquid crystal display device is increased, and the manufacturing cost can be reduced.
Then, the liquid crystal panel P is disposed on the surface side of the light diffusing member 3, the light reflecting sheet 6 and the back plate 7 are disposed on the back side of the surface emitting flat lamp 1, and the outer peripheral surface is covered with the top cover 12. Make the whole unity.
The outer peripheral frame 5, the main body frame 8, the pressing frame 9, the top cover 12, and the like can be formed of a synthetic resin material or a metal material.

このように、上記液晶表示装置用バックライトユニットは、光源に面発光フラットランプ１を使用しているので、大型の液晶表示装置の場合でも、照度の不足、不均一が生じないようにすることができる。
また、面発光フラットランプ１と光拡散部材３との間に空気層２を形成するとともに、光拡散部材３を背面側から支持部材４により支持するようにしているので、光拡散部材３の自重やフラットランプ１から発生する熱による光拡散部材３の変形（撓み）を防止することができ、光源に面発光フラットランプ１を使用したことと相俟って、高品位の照明を行うことができ、かつ、部品点数が少なく、構造が簡易で製造に手数を要さず、製造コストを低廉にできる。 As described above, the backlight unit for a liquid crystal display device uses the surface emitting flat lamp 1 as a light source. Therefore, even in the case of a large-sized liquid crystal display device, an insufficient illuminance and unevenness should not occur. Can do.
Further, since the air layer 2 is formed between the surface emitting flat lamp 1 and the light diffusing member 3 and the light diffusing member 3 is supported by the support member 4 from the back side, the weight of the light diffusing member 3 is reduced. Further, deformation (bending) of the light diffusion member 3 due to heat generated from the flat lamp 1 can be prevented, and combined with the use of the surface emitting flat lamp 1 as a light source, high-quality illumination can be performed. In addition, the number of parts is small, the structure is simple, and the manufacturing process is not required, and the manufacturing cost can be reduced.

以上、本発明の液晶表示装置用バックライトユニットについて、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができるものである。   As described above, the backlight unit for a liquid crystal display device of the present invention has been described based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and may be appropriately selected within the scope not departing from the spirit thereof. The configuration can be changed.

本発明の液晶表示装置用バックライトユニットは、照度の不足、不均一が生じないようにするとともに、光拡散部材の自重や面発光フラットランプから発生する熱による光拡散部材の変形（撓み）を防止し、高品位の照明を行うことができ、かつ、部品点数が少なく、構造が簡易で製造に手数を要さず、製造コストを低廉にできることから、特に、大型の液晶表示装置のバックライトユニットとして好適に用いることができる。   The backlight unit for a liquid crystal display device according to the present invention prevents deficiency and non-uniformity in illuminance, and deforms (bends) the light diffusing member due to its own weight or heat generated from the surface emitting flat lamp. In particular, the backlight for large-sized liquid crystal display devices can provide high-quality illumination, has a small number of parts, has a simple structure, requires no labor, and can be manufactured at low cost. It can be suitably used as a unit.

本発明の液晶表示装置用バックライトユニットの一実施例を示す部分断面である。It is a fragmentary cross section which shows one Example of the backlight unit for liquid crystal display devices of this invention. 同全体概略斜視図である。It is the same whole schematic perspective view. 同支持部材の配設状態を示し、（ａ）は部分斜視図、（ｂ）は部分断面図である。The arrangement | positioning state of the support member is shown, (a) is a fragmentary perspective view, (b) is a fragmentary sectional view. 同支持部材の配設状態を示す部分断面斜視図である。It is a fragmentary sectional perspective view which shows the arrangement | positioning state of the support member. 同支持部材の断面形状を示す説明図である。It is explanatory drawing which shows the cross-sectional shape of the support member. 同面発光フラットランプを示し、（ａ）は表面側、（ｂ）は（ａ）の部分拡大図、（ｃ）は裏面側である。The same surface light emission flat lamp is shown, (a) is the surface side, (b) is the elements on larger scale of (a), (c) is the back side. 従来のバックライト機構の斜視図である。It is a perspective view of the conventional backlight mechanism. 同側面図である。It is the same side view.

符号の説明Explanation of symbols

１ 面発光フラットランプ
１１ 面発光フラットランプの端部
２ 空気層
３ 光拡散部材
３１ 光拡散板
３２ 光拡散シート
４ 支持部材
５ 外周フレーム
６ 光反射シート
７ 背面板
８ 本体フレーム
９ 押さえ枠
１０ スペーサー DESCRIPTION OF SYMBOLS 1 Surface emitting flat lamp 11 End part of surface emitting flat lamp 2 Air layer 3 Light diffusing member 31 Light diffusing plate 32 Light diffusing sheet 4 Support member 5 Peripheral frame 6 Light reflecting sheet 7 Back plate 8 Main body frame 9 Holding frame 10 Spacer

Claims (6)

光源に面発光フラットランプを使用した液晶表示装置用バックライトユニットにおいて、フラットランプと光拡散部材との間に空気層を形成するとともに、前記光拡散部材を背面側から支持部材により支持するようにしたことを特徴とする液晶表示装置用バックライトユニット。   In a backlight unit for a liquid crystal display device using a surface emitting flat lamp as a light source, an air layer is formed between the flat lamp and the light diffusing member, and the light diffusing member is supported by a support member from the back side. A backlight unit for a liquid crystal display device. 支持部材を面発光フラットランプの表面に配設したことを特徴とする請求項１記載の液晶表示装置用バックライトユニット。   2. The backlight unit for a liquid crystal display device according to claim 1, wherein the supporting member is disposed on the surface of the surface emitting flat lamp. 支持部材を透明又は半透明の合成樹脂材料で形成したことを特徴とする請求項１又は２記載の液晶表示装置用バックライトユニット。   3. The backlight unit for a liquid crystal display device according to claim 1, wherein the supporting member is made of a transparent or translucent synthetic resin material. 支持部材の頂点で光拡散部材を面状に支持するようにしたことを特徴とする請求項１、２又は３記載の液晶表示装置用バックライトユニット。   4. The backlight unit for a liquid crystal display device according to claim 1, wherein the light diffusing member is supported in a planar shape at the apex of the supporting member. 支持部材の頂点で光拡散部材を線状又は点状に支持するようにしたことを特徴とする請求項１、２又は３記載の液晶表示装置用バックライトユニット。   4. The backlight unit for a liquid crystal display device according to claim 1, wherein the light diffusing member is supported linearly or in the form of dots at the apex of the supporting member. 面発光フラットランプと光拡散部材との間隔を保持する外周フレームの内周面を背面側から表面側に向けて拡開する傾斜面に形成したことを特徴とする請求項１、２、３、４又は５記載の液晶表示装置用バックライトユニット。   The inner peripheral surface of the outer peripheral frame that holds the distance between the surface emitting flat lamp and the light diffusing member is formed as an inclined surface that expands from the back side toward the front side. The backlight unit for a liquid crystal display device according to 4 or 5.
JP2004006488A 2004-01-14 2004-01-14 Backlight unit for liquid crystal display Expired - Fee Related JP4066053B2 (en)

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TW093124874A TW200530705A (en) 2004-01-14 2004-08-18 Backlight unit for liquid crystal display device
KR1020040070598A KR20050074886A (en) 2004-01-14 2004-09-04 Backlight unit for liquid crystal display device
CNA2004100797509A CN1641442A (en) 2004-01-14 2004-09-16 Back-light mechanism for liquid crystal display device

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WO2008129725A1 (en) 2007-04-09 2008-10-30 Sharp Kabushiki Kaisha Lighting device for display device, display device, and tv receiver
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US8220942B2 (en) 2007-04-09 2012-07-17 Sharp Kabushiki Kaisha Lighting device for display device, display device, and television receiver apparatus
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JP2014038792A (en) * 2012-08-20 2014-02-27 Iwasaki Electric Co Ltd Radiation device and pseudo sunlight radiation device

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