WO2013069371A1 - Backlight device and liquid crystal display device provided with same - Google Patents

Backlight device and liquid crystal display device provided with same Download PDF

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Publication number
WO2013069371A1
WO2013069371A1 PCT/JP2012/073405 JP2012073405W WO2013069371A1 WO 2013069371 A1 WO2013069371 A1 WO 2013069371A1 JP 2012073405 W JP2012073405 W JP 2012073405W WO 2013069371 A1 WO2013069371 A1 WO 2013069371A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal panel
backlight device
back surface
optical sheet
Prior art date
Application number
PCT/JP2012/073405
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French (fr)
Japanese (ja)
Inventor
賢司 高瀬
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シャープ株式会社
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Publication of WO2013069371A1 publication Critical patent/WO2013069371A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer

Definitions

  • the present invention relates to a backlight device for a display panel and a liquid crystal display device including the same.
  • a backlight device is usually combined with a display panel that does not emit light by itself, such as a liquid crystal panel.
  • a display panel that does not emit light by itself
  • Patent Document 1 An example of a backlight device combined with a liquid crystal panel is described in Patent Document 1.
  • the backlight device described in Patent Document 1 includes an edge light type light guide plate.
  • An optical sheet group is overlaid on the light guide plate.
  • the optical sheet group includes a prism sheet, and the dimensions of the prism sheet and the frame that accommodates it are set as follows so that the prism sheet does not deform even when used under high temperature and high humidity conditions.
  • the prism sheet has a first edge and a second edge intersecting with the first edge
  • the frame has a first side wall along the first edge and a second side wall along the second edge of the prism sheet,
  • the difference between the length and the length of the first sidewall is larger than the difference between the length of the second edge and the second sidewall. Accordingly, the prism sheet is prevented from being deformed due to contact or interference between the prism sheet and the frame.
  • the 10 to 12 show configuration examples of a backlight device including an edge light type light guide plate.
  • the backlight device 10 combined with the liquid crystal panel 1 has a tray-like chassis 11.
  • the chassis 11 has a rectangular shape in plan and is formed by sheet metal pressing or synthetic resin injection molding.
  • a liquid crystal panel base 12 that supports the liquid crystal panel 1 is fixed to the opening of the chassis 11.
  • a light guide plate 13 having a substantially rectangular planar shape is disposed.
  • the light guide plate 13 is a rectangle having a notch at the edge and an irregular outline for the purpose of positioning or the like.
  • a light emitting diode (hereinafter referred to as “LED”) 14 serving as a light source faces the end surface of the light guide plate 13, and the light guide plate 13 receives light emitted from the LED 14 from the end surface.
  • the LEDs 14 may be disposed on a plurality of end faces of the light guide plate 13.
  • the light incident on the light guide plate 13 is reflected by a texture pattern (dot pattern) formed on the back surface of the light guide plate 13 and is emitted from the front surface side of the light guide plate 13.
  • the light irradiates the liquid crystal panel 1 from the back surface.
  • a plurality of LEDs 14 are arranged in a row on the LED mounting substrate 19.
  • a cold cathode fluorescent lamp (CCFL) may be used as the light source instead of the LED.
  • the optical sheet laminate 15 is configured by a three-layer optical sheet.
  • the three-layer optical sheet is provided with reference numerals 15a, 15b, and 15c in order from the light guide plate 13 side.
  • the first optical sheet 15a is composed of a diffusion sheet, a microlens sheet, a prism sheet, and the like
  • the second optical sheet 15b is composed of a diffusion sheet, a microlens sheet, a prism sheet, and the like, and the three layers closest to the liquid crystal panel 1
  • the optical sheet 15c of the eye is composed of a polarizing reflection sheet, a diffusion sheet, a microlens sheet, and the like.
  • the optical sheets 15a, 15b, and 15c are equal in size and their ends are aligned vertically.
  • the liquid crystal panel base 12 supports the liquid crystal panel 1 on the front surface and suppresses the optical sheet laminate 15 on the back surface.
  • the reflective sheet 16 is overlaid on the surface of the chassis 11 so that as much of the light incident on the light guide plate 13 is directed to the liquid crystal panel 1, and the light guide plate 13 is overlaid thereon.
  • a highly reflective sheet made of a polyethylene terephthalate (PET) foam or the like is used as the reflection sheet 16.
  • a gap G is provided between the edge of the optical sheet laminate 15 and the liquid crystal panel base 12.
  • the gap G has the following role. That is, when the backlight device 10 reaches a high temperature, the optical sheet laminate 15 expands. When the edge of the optical sheet laminate 15 hits the liquid crystal panel base 12 due to expansion and the optical sheet laminate 15 bends, luminance unevenness occurs in the liquid crystal panel 1. In order to prevent this, a gap G is provided between the edge of the optical sheet laminate 15 and the liquid crystal panel base 12 so that the edge does not hit the liquid crystal panel base 12 even if the optical sheet laminate 15 expands. .
  • the gap G also brings about the following harmful effects.
  • the LED 14 is caused to emit light, if there is a gap G, the emitted light from the LED 14 directly irradiates the end face of the optical sheet laminate 15 as shown in FIG. This means that an optical path through which the light emitted from the LED 14 leaks outside without passing through the light guide plate 13 is formed. Such a situation is undesirable in forming uniform planar light.
  • the optical sheets 15a, 15b, and 15c are not necessarily in close contact with each other. There are also places that have gaps. Further, the frame-shaped contact surface between the optical sheet 15c and the liquid crystal panel base 12 is not necessarily in close contact with the entire periphery, and there is a portion where a gap is generated. When the light emitted from the LED 14 enters such a gap, it is visually recognized as a bright line through the liquid crystal panel 1. Such bright lines reduce the quality of the light emitting surface. Moreover, since it is the light which does not become the emitted light from the light-guide plate 13, the utilization efficiency of the emitted light from LED14 falls.
  • the above problem does not occur only in the portion of the optical sheet laminate 15 facing the LED 14.
  • the light transmitted through the inside of the light guide plate 13 is reflected by the liquid crystal panel base 12 even at a location where the LED 14 is not arranged, that is, a location on the end surface orthogonal to the end surface facing the LED 14. Illuminate the end face of the body 15. This light can also generate bright lines.
  • the present invention has been made to improve the above-described points, and is intended to reduce the occurrence of bright lines in the optical sheet laminate that is overlaid on the edge light type light guide plate, thereby reducing the quality of the light emitting surface. .
  • the present invention provides a tray-shaped chassis, an edge light type light guide plate overlaid on the surface of the chassis, an optical sheet laminate overlaid on the surface of the light guide plate, and a mouth of the chassis.
  • a backlight device including a liquid crystal panel base fixed to an edge and holding the optical sheet stack on the back side
  • the optical sheet stack includes a plurality of optical sheets constituting the optical sheet stack supported by the liquid crystal panel base. The closer the LCD panel is, the smaller it becomes, and the edges form a staircase shape.
  • the liquid crystal panel base is subjected to back surface processing, and the back surface processing is to form a step shape corresponding to the step shape of the edge of the optical sheet laminate. preferable.
  • the stepped shape of the liquid crystal panel base has rounded corners.
  • the liquid crystal panel base is subjected to back surface processing, and the back surface processing is pasting of a reflection sheet.
  • the liquid crystal panel base is subjected to back surface processing, and the back surface processing is a coating of a reflective layer.
  • the light guide plate has a plurality of sides as incident sides, and the back surface processing of the liquid crystal panel base is performed for each incident side.
  • the back surface processing of the liquid crystal panel base is also performed on a side other than the light incident side of the light guide plate.
  • the present invention includes a liquid crystal display device in which the backlight device having the above configuration is combined with a liquid crystal panel.
  • the light emitted from the light source tends to directly shine through the gaps between the optical sheets. Leakage also increases.
  • the closer to the liquid crystal panel, the smaller the plurality of optical sheets constituting the optical sheet laminate, and when the edge of the optical sheet laminate has a staircase shape Light that illuminates the gaps between the sheets is reduced. There is not much light reflected on the back surface of the liquid crystal panel base and entering the gap between the optical sheets. Thereby, it can suppress that a bright line arises in an optical sheet laminated body, and the quality of a light emitting surface falls.
  • FIG. 6 is a schematic cross-sectional view of a partial structure perpendicular to FIG.
  • FIG. 5 in a backlight device according to a second embodiment.
  • FIG. 11 is a schematic cross-sectional view of a partial structure perpendicular to FIG. 10 in a conventional backlight device.
  • the edge of the optical sheet laminate 15 has a stepped shape.
  • a schematic plan view of the backlight device 10 is arranged at the center, and a graph of luminance distribution at a location along the line AA ′ in the schematic plan view is arranged at the top.
  • a graph of the luminance distribution at the location along the line BB ′ is arranged below.
  • the solid line in the graph represents the luminance distribution according to the structure of the first embodiment, and the broken line represents the luminance distribution according to the conventional structure shown in FIGS.
  • the luminance unevenness is large in the conventional structure, whereas the luminance unevenness is small in the structure of the first embodiment. This indicates that the bright line can be visually recognized in the conventional structure, whereas the bright line is hardly visible in the structure of the first embodiment.
  • the luminance of the conventional structure is low overall, whereas the luminance of the structure of the first embodiment is high. This indicates that the light emitted from the light source is more effectively utilized in the structure of the first embodiment.
  • FIG. 5 shows a second embodiment.
  • the second embodiment is characterized by the structure of the liquid crystal panel base 12. That is, the back surface processing is performed on the liquid crystal panel base 12, and the back surface processing is the formation of the step shape 12 a corresponding to the step shape of the edge of the optical sheet laminate 15.
  • the staircase shape 12a By forming the staircase shape 12a on the back surface of the liquid crystal panel base 12, the gap between the optical sheets 15a, 15b and 15c and the liquid crystal panel base 12 is secured, and the ratio of the light emitted from the LED 14 entering the gap is smaller. it can. Thereby, it is possible to further reduce luminance unevenness and suppress generation of bright lines as compared to the first embodiment. Further, the overall brightness of the optical sheet laminate 15 can be increased.
  • the reason why the staircase shape 12a is formed on the back surface of the liquid crystal panel base 12 is not only the side of the light guide plate 13 where the LEDs 14 face each other (hereinafter referred to as “light incident side”). As shown in FIG. 6, a staircase shape 12 a is also formed on a side other than the light incident side. Again, while ensuring a gap between the optical sheets 15a, 15b, and 15c and the liquid crystal panel base 12, the ratio of the light emitted from the LED 14 to the gap is reduced to reduce unevenness in luminance and suppress the generation of bright lines. can do. Further, the overall brightness of the optical sheet laminate 15 can be increased.
  • FIG. 7 shows a third embodiment.
  • the feature of the third embodiment is that the corner of the stepped shape 12a on the back surface of the liquid crystal panel base 12 is rounded to form a rounded portion 12b.
  • the optical sheets 15c, 15b, 15a are scratched at sharp angles, or the optical sheets 15c, 15b, 15a are damaged. You can avoid doing that.
  • FIG. 8 shows a fourth embodiment.
  • the feature of the fourth embodiment is that, as the back surface processing of the liquid crystal panel base 12, in addition to the formation of the staircase shape 12a and the formation of the rounded portion 12b, a reflection sheet 17 is attached.
  • a highly reflective sheet similar to the reflection sheet 16 is selected. That is, a white PET reflective sheet or liquid crystal polymer having a high reflectance (reflectance of about 70 to 95%) is selected.
  • FIG. 9 shows a fifth embodiment.
  • the feature of the fifth embodiment is that, as the back surface processing of the liquid crystal panel base 12, in addition to the formation of the stepped shape 12a and the formation of the rounded portion 12b, the reflective layer 18 is coated.
  • the reflective layer 18 can be formed by, for example, specular reflection silver plating.
  • specular reflection silver plating layer can be highly reflective with a reflectance of about 70 to 95%.
  • the highly reflective reflective layer 18 By forming the highly reflective reflective layer 18 in this way, the rate at which the light emitted from the LED 14 is absorbed by the liquid crystal panel base 12 when reflected by the back surface of the liquid crystal panel base 12 is reduced, and the light is more effectively used. Can be used.
  • two opposite sides of the light guide plate 13 are incident sides.
  • the present invention is widely applicable to edge light type backlights.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A backlight device (10) is provided with: a tray-shaped chassis (11); an edge light type light guide plate (13) that is placed over the surface of the chassis; an optical sheet laminated body (15) that is placed over the surface of the light guide plate; and a liquid crystal panel base (12) that is secured to an opening edge part of the chassis, supports a liquid crystal panel (1) by the surface, and holds the optical sheet laminated body by the back surface. The optical sheets (15a, 15b, 15c) that constitute the optical sheet laminated body become smaller closer to the liquid crystal panel, and the edge parts form a stepped shape.

Description

バックライト装置及びそれを備えた液晶表示装置Backlight device and liquid crystal display device including the same
　本発明は表示パネルのバックライト装置及びそれを備えた液晶表示装置に関する。 The present invention relates to a backlight device for a display panel and a liquid crystal display device including the same.
　自ら発光することのない表示パネル、例えば液晶パネルには、通常、バックライト装置が組み合わせられる。液晶パネルに組み合わせられるバックライト装置の例が特許文献１に記載されている。 A backlight device is usually combined with a display panel that does not emit light by itself, such as a liquid crystal panel. An example of a backlight device combined with a liquid crystal panel is described in Patent Document 1.
　特許文献１に記載されたバックライト装置はエッジライト方式の導光板を備える。導光板には光学シート群が重ねられる。光学シート群にはプリズムシートが含まれるものであり、高温高湿の状況下で用いてもプリズムシートが変形しないように、プリズムシートとそれを収容する枠体との寸法が次のように設定されている。すなわちプリズムシートは第１縁辺とこれに交差する第２縁辺を有し、枠体はプリズムシートの第１縁辺に沿う第１側壁と第２縁辺に沿う第２側壁を有し、第１縁辺の長さと第１側壁の長さの差が、第２縁辺と第２側壁の長さの差より大きい。これにより、プリズムシートと枠体との接触又は干渉によるプリズムシートの変形を防止することとされている。 The backlight device described in Patent Document 1 includes an edge light type light guide plate. An optical sheet group is overlaid on the light guide plate. The optical sheet group includes a prism sheet, and the dimensions of the prism sheet and the frame that accommodates it are set as follows so that the prism sheet does not deform even when used under high temperature and high humidity conditions. Has been. That is, the prism sheet has a first edge and a second edge intersecting with the first edge, and the frame has a first side wall along the first edge and a second side wall along the second edge of the prism sheet, The difference between the length and the length of the first sidewall is larger than the difference between the length of the second edge and the second sidewall. Accordingly, the prism sheet is prevented from being deformed due to contact or interference between the prism sheet and the frame.
特開２０１０－７３４５８号公報JP 2010-73458 A
　エッジライト方式の導光板を備えたバックライト装置の構成例を図１０から図１２に示す。液晶パネル１に組み合わせられるバックライト装置１０はトレイ状のシャーシ１１を有する。シャーシ１１は平面形状矩形であり、板金のプレス加工または合成樹脂の射出成型で形成される。シャーシ１１の開口部には液晶パネル１を支持する液晶パネル台１２が固定される。シャーシ１１の内部には平面形状略矩形の導光板１３が配置される。導光板１３は、位置決め等の目的で縁に切り欠きが設けられ、輪郭が不整になった矩形であることも多い。 10 to 12 show configuration examples of a backlight device including an edge light type light guide plate. The backlight device 10 combined with the liquid crystal panel 1 has a tray-like chassis 11. The chassis 11 has a rectangular shape in plan and is formed by sheet metal pressing or synthetic resin injection molding. A liquid crystal panel base 12 that supports the liquid crystal panel 1 is fixed to the opening of the chassis 11. Inside the chassis 11, a light guide plate 13 having a substantially rectangular planar shape is disposed. In many cases, the light guide plate 13 is a rectangle having a notch at the edge and an irregular outline for the purpose of positioning or the like.
　導光板１３の端面には光源となる発光ダイオード（以下「ＬＥＤ」と称する）１４が向き合わせられ、導光板１３はＬＥＤ１４からの出射光を端面から受け入れる。導光板１３の複数の端面に対しＬＥＤ１４が配置されることもある。導光板１３に入射した光は導光板１３の裏面に形成されたシボパターン（ドットパターン）で反射され、導光板１３の表面側から出射する。その光が液晶パネル１を裏面から照射する。図１１に示す通り、ＬＥＤ１４は複数のものがＬＥＤ実装基板１９に１列に配置されている。なおＬＥＤに代え冷陰極蛍光ランプ（ＣＣＦＬ）を光源とすることとしてもよい。 A light emitting diode (hereinafter referred to as “LED”) 14 serving as a light source faces the end surface of the light guide plate 13, and the light guide plate 13 receives light emitted from the LED 14 from the end surface. The LEDs 14 may be disposed on a plurality of end faces of the light guide plate 13. The light incident on the light guide plate 13 is reflected by a texture pattern (dot pattern) formed on the back surface of the light guide plate 13 and is emitted from the front surface side of the light guide plate 13. The light irradiates the liquid crystal panel 1 from the back surface. As shown in FIG. 11, a plurality of LEDs 14 are arranged in a row on the LED mounting substrate 19. A cold cathode fluorescent lamp (CCFL) may be used as the light source instead of the LED.
　導光板１３から出射する光は、導光板１３の表面に重ねられる光学シート積層体１５を通じて液晶パネル１を照射する。図１０から図１２に示す構成例では、光学シート積層体１５は３層の光学シートにより構成される。３層の光学シートには、導光板１３の側より順に、１５ａ、１５ｂ、１５ｃの符号が付されている。１層目の光学シート１５ａは拡散シート、マイクロレンズシート、プリズムシート等からなり、２層目の光学シート１５ｂは拡散シート、マイクロレンズシート、プリズムシート等からなり、液晶パネル１に最も近い３層目の光学シート１５ｃは偏光反射シート、拡散シート、マイクロレンズシート等からなる。 The light emitted from the light guide plate 13 irradiates the liquid crystal panel 1 through the optical sheet laminate 15 superimposed on the surface of the light guide plate 13. In the configuration example shown in FIGS. 10 to 12, the optical sheet laminate 15 is configured by a three-layer optical sheet. The three-layer optical sheet is provided with reference numerals 15a, 15b, and 15c in order from the light guide plate 13 side. The first optical sheet 15a is composed of a diffusion sheet, a microlens sheet, a prism sheet, and the like, and the second optical sheet 15b is composed of a diffusion sheet, a microlens sheet, a prism sheet, and the like, and the three layers closest to the liquid crystal panel 1 The optical sheet 15c of the eye is composed of a polarizing reflection sheet, a diffusion sheet, a microlens sheet, and the like.
　光学シート１５ａ、１５ｂ、１５ｃはサイズが等しく、端が上下に整列している。液晶パネル台１２は、表面で液晶パネル１を支持するとともに、裏面で光学シート積層体１５を抑え込むものとされている。 The optical sheets 15a, 15b, and 15c are equal in size and their ends are aligned vertically. The liquid crystal panel base 12 supports the liquid crystal panel 1 on the front surface and suppresses the optical sheet laminate 15 on the back surface.
　導光板１３に入射した光のできるだけ多くの部分が液晶パネル１に向かうよう、シャーシ１１の表面に反射シート１６が重ねられ、その上に導光板１３が重ねられる。反射シート１６としては、ポリエチレンテレフタレート（ＰＥＴ）の発泡体などからなる、反射率の高いものが用いられる。 The reflective sheet 16 is overlaid on the surface of the chassis 11 so that as much of the light incident on the light guide plate 13 is directed to the liquid crystal panel 1, and the light guide plate 13 is overlaid thereon. As the reflection sheet 16, a highly reflective sheet made of a polyethylene terephthalate (PET) foam or the like is used.
　光学シート積層体１５の縁と液晶パネル台１２の間には隙間Ｇが設けられている。隙間Ｇは次のような役割を持つ。すなわちバックライト装置１０が高温になると光学シート積層体１５が膨張する。膨張により光学シート積層体１５の縁が液晶パネル台１２に当たり、光学シート積層体１５が撓むと、液晶パネル１に輝度ムラが生じてしまう。これを防ぐため、光学シート積層体１５の縁と液晶パネル台１２の間に隙間Ｇを設け、光学シート積層体１５が膨張しても縁が液晶パネル台１２に当たらないようにしているのである。 A gap G is provided between the edge of the optical sheet laminate 15 and the liquid crystal panel base 12. The gap G has the following role. That is, when the backlight device 10 reaches a high temperature, the optical sheet laminate 15 expands. When the edge of the optical sheet laminate 15 hits the liquid crystal panel base 12 due to expansion and the optical sheet laminate 15 bends, luminance unevenness occurs in the liquid crystal panel 1. In order to prevent this, a gap G is provided between the edge of the optical sheet laminate 15 and the liquid crystal panel base 12 so that the edge does not hit the liquid crystal panel base 12 even if the optical sheet laminate 15 expands. .
　上記隙間Ｇは、一方では次のような弊害ももたらす。ＬＥＤ１４を発光させたとき、隙間Ｇがあると、図１２に示す通りＬＥＤ１４からの出射光が直接光学シート積層体１５の端面を照射するといったことが起こる。これはＬＥＤ１４からの出射光が導光板１３を通らずに外部に漏れる光路が形成されることを意味する。このような事態は均一な面状光を形成する上で望ましくない。 The gap G also brings about the following harmful effects. When the LED 14 is caused to emit light, if there is a gap G, the emitted light from the LED 14 directly irradiates the end face of the optical sheet laminate 15 as shown in FIG. This means that an optical path through which the light emitted from the LED 14 leaks outside without passing through the light guide plate 13 is formed. Such a situation is undesirable in forming uniform planar light.
　光学シート１５ａ、１５ｂ、１５ｃは、必ずしも互いの全面で密着状態となっている訳ではない。隙間を生じている箇所も存在する。また光学シート１５ｃと液晶パネル台１２の間の額縁状の接触面も、必ずしも全周で密着状態となっている訳ではなく、隙間を生じている箇所も存在する。このような隙間にＬＥＤ１４の出射光が入り込むと、それは液晶パネル１を通じ輝線として視認される。このような輝線は発光面の品位を低下させる。また導光板１３からの出射光とはならない光であるから、ＬＥＤ１４からの出射光の利用効率が低下する。 The optical sheets 15a, 15b, and 15c are not necessarily in close contact with each other. There are also places that have gaps. Further, the frame-shaped contact surface between the optical sheet 15c and the liquid crystal panel base 12 is not necessarily in close contact with the entire periphery, and there is a portion where a gap is generated. When the light emitted from the LED 14 enters such a gap, it is visually recognized as a bright line through the liquid crystal panel 1. Such bright lines reduce the quality of the light emitting surface. Moreover, since it is the light which does not become the emitted light from the light-guide plate 13, the utilization efficiency of the emitted light from LED14 falls.
　図１３に示す通り、導光板１３の対向２端面に対しＬＥＤ１４が配置されていれば、図１２で説明した問題が導光板１３の対向２端面で生じることになる。 As shown in FIG. 13, if the LEDs 14 are arranged with respect to the opposite two end surfaces of the light guide plate 13, the problem described in FIG. 12 occurs on the opposite two end surfaces of the light guide plate 13.
　上記のような問題は、光学シート積層体１５の中でＬＥＤ１４に面する箇所においてのみ生じる訳ではない。図１４に示す通り、ＬＥＤ１４が配置されていない箇所、すなわちＬＥＤ１４に面する端面に直交する端面の箇所でも、導光板１３の内部を伝ってきた光が液晶パネル台１２で反射され、光学シート積層体１５の端面を照らす。この光も輝線を発生させ得る。 The above problem does not occur only in the portion of the optical sheet laminate 15 facing the LED 14. As shown in FIG. 14, the light transmitted through the inside of the light guide plate 13 is reflected by the liquid crystal panel base 12 even at a location where the LED 14 is not arranged, that is, a location on the end surface orthogonal to the end surface facing the LED 14. Illuminate the end face of the body 15. This light can also generate bright lines.
　本発明は上記の点を改善すべくなされたものであり、エッジライト方式の導光板に重ねられる光学シート積層体に輝線が生じて発光面の品位を低下させることを少なくしようとするものである。 The present invention has been made to improve the above-described points, and is intended to reduce the occurrence of bright lines in the optical sheet laminate that is overlaid on the edge light type light guide plate, thereby reducing the quality of the light emitting surface. .
　上記目的を達成するため、本発明は、トレイ状のシャーシと、前記シャーシの表面に重ねられるエッジライト方式の導光板と、前記導光板の表面に重ねられる光学シート積層体と、前記シャーシの口縁部に固定され、裏面で前記光学シート積層体を抑え込む液晶パネル台とを備えたバックライト装置において、前記光学シート積層体は、それを構成する複数の光学シートが前記液晶パネル台に支持される液晶パネルに近いものほど小さくなり、縁部が階段形状をなす。 In order to achieve the above object, the present invention provides a tray-shaped chassis, an edge light type light guide plate overlaid on the surface of the chassis, an optical sheet laminate overlaid on the surface of the light guide plate, and a mouth of the chassis. In a backlight device including a liquid crystal panel base fixed to an edge and holding the optical sheet stack on the back side, the optical sheet stack includes a plurality of optical sheets constituting the optical sheet stack supported by the liquid crystal panel base. The closer the LCD panel is, the smaller it becomes, and the edges form a staircase shape.
　上記構成のバックライト装置において、前記液晶パネル台には裏面加工が施されるものであり、前記裏面加工は前記光学シート積層体の縁部の階段形状に対応する階段形状の形成であることが好ましい。 In the backlight device having the above-described configuration, the liquid crystal panel base is subjected to back surface processing, and the back surface processing is to form a step shape corresponding to the step shape of the edge of the optical sheet laminate. preferable.
　上記構成のバックライト装置において、前記液晶パネル台の階段形状は、角が丸められていることが好ましい。 In the backlight device configured as described above, it is preferable that the stepped shape of the liquid crystal panel base has rounded corners.
　上記構成のバックライト装置において、前記液晶パネル台には裏面加工が施されるものであり、前記裏面加工は反射シートの貼り付けであることが好ましい。 In the backlight device having the above-described configuration, it is preferable that the liquid crystal panel base is subjected to back surface processing, and the back surface processing is pasting of a reflection sheet.
　上記構成のバックライト装置において、前記液晶パネル台には裏面加工が施されるものであり、前記裏面加工は反射層のコーティングであることが好ましい。 In the backlight device having the above configuration, it is preferable that the liquid crystal panel base is subjected to back surface processing, and the back surface processing is a coating of a reflective layer.
　上記構成のバックライト装置において、前記導光板は複数の辺を入光辺とするものであり、前記入光辺毎に前記液晶パネル台の裏面加工が施されることが好ましい。 In the backlight device having the above-described configuration, it is preferable that the light guide plate has a plurality of sides as incident sides, and the back surface processing of the liquid crystal panel base is performed for each incident side.
　上記構成のバックライト装置において、前記導光板の入光辺以外の辺においても前記液晶パネル台の裏面加工が施されることが好ましい。 In the backlight device having the above-described configuration, it is preferable that the back surface processing of the liquid crystal panel base is also performed on a side other than the light incident side of the light guide plate.
　また本発明には、上記構成のバックライト装置を液晶パネルに組み合わせた液晶表示装置が含まれる。 Further, the present invention includes a liquid crystal display device in which the backlight device having the above configuration is combined with a liquid crystal panel.
　図１０から図１２に示す構成例のように、光学シート積層体を構成する複数の光学シートの端が整列していると、光源からの出射光が光学シート間の隙間を直射しやすく、光漏れも多くなる。これに対し本発明のように、光学シート積層体を構成する複数の光学シートが液晶パネルに近いものほど小さくなり、光学シート積層体の縁部が階段形状をなしていると、直射状態で光学シート間の隙間を照らす光が減る。液晶パネル台の裏面で反射して光学シート間の隙間に入る光は多くない。これにより、光学シート積層体に輝線が生じて発光面の品位が低下することを抑制できる。 When the ends of a plurality of optical sheets constituting the optical sheet laminate are aligned as in the configuration examples shown in FIGS. 10 to 12, the light emitted from the light source tends to directly shine through the gaps between the optical sheets. Leakage also increases. On the other hand, as in the present invention, the closer to the liquid crystal panel, the smaller the plurality of optical sheets constituting the optical sheet laminate, and when the edge of the optical sheet laminate has a staircase shape, Light that illuminates the gaps between the sheets is reduced. There is not much light reflected on the back surface of the liquid crystal panel base and entering the gap between the optical sheets. Thereby, it can suppress that a bright line arises in an optical sheet laminated body, and the quality of a light emitting surface falls.
本発明の第１実施形態に係るバックライト装置の部分構造を示す概略断面図である。It is a schematic sectional drawing which shows the partial structure of the backlight apparatus which concerns on 1st Embodiment of this invention. 第１実施形態に係るバックライト装置の概略平面図である。It is a schematic plan view of the backlight device according to the first embodiment. 第１実施形態に係るバックライト装置の部分構造を示す概略断面図であって、光源が発光した時の状態を示すものである。It is a schematic sectional drawing which shows the partial structure of the backlight apparatus which concerns on 1st Embodiment, Comprising: The state when a light source light-emits is shown. 第１実施形態に係るバックライト装置における輝度の分布について説明する図である。It is a figure explaining the distribution of the brightness | luminance in the backlight apparatus which concerns on 1st Embodiment. 本発明の第２実施形態に係るバックライト装置の部分構造を示す概略断面図である。It is a schematic sectional drawing which shows the partial structure of the backlight apparatus which concerns on 2nd Embodiment of this invention. 第２実施形態に係るバックライト装置において、図５と直角をなす部分構造の概略断面図である。FIG. 6 is a schematic cross-sectional view of a partial structure perpendicular to FIG. 5 in a backlight device according to a second embodiment. 本発明の第３実施形態に係るバックライト装置の部分構造を示す概略断面図である。It is a schematic sectional drawing which shows the partial structure of the backlight apparatus which concerns on 3rd Embodiment of this invention. 本発明の第４実施形態に係るバックライト装置の部分構造を示す概略断面図である。It is a schematic sectional drawing which shows the partial structure of the backlight apparatus which concerns on 4th Embodiment of this invention. 本発明の第５実施形態に係るバックライト装置の部分構造を示す概略断面図である。It is a schematic sectional drawing which shows the partial structure of the backlight apparatus which concerns on 5th Embodiment of this invention. 従来のバックライト装置の部分構造を示す概略断面図である。It is a schematic sectional drawing which shows the partial structure of the conventional backlight apparatus. 従来のバックライト装置の概略平面図である。It is a schematic plan view of a conventional backlight device. 従来のバックライト装置の部分構造を示す概略断面図であって、光源が発光した時の状態を示すものである。It is a schematic sectional drawing which shows the partial structure of the conventional backlight apparatus, Comprising: The state when a light source light-emits is shown. 従来のバックライト装置の他の構成例を示す図である。It is a figure which shows the other structural example of the conventional backlight apparatus. 従来のバックライト装置において、図１０と直角をなす部分構造の概略断面図である。FIG. 11 is a schematic cross-sectional view of a partial structure perpendicular to FIG. 10 in a conventional backlight device.
　以下、図１から図９までの図面に基づき本発明に係るバックライト装置の第１実施形態から第５実施形態までを説明する。いずれの実施形態においても、図１０以下の従来のバックライト装置と機能的に共通する構成要素については図１０以下で用いた符号をそのまま付し、説明は省略する。 Hereinafter, the first to fifth embodiments of the backlight device according to the present invention will be described with reference to FIGS. 1 to 9. In any of the embodiments, constituent elements that are functionally common to the conventional backlight device of FIG. 10 and below are denoted by the same reference numerals used in FIG.
　図１から図３に第１実施形態を示す。第１実施形態のバックライト装置１０では、光学シート積層体１５を構成する３層の光学シート１５ａ、１５ｂ、１５ｃが、液晶パネル台１２に支持される液晶パネル１に近いものほど小さくされ、その結果、光学シート積層体１５の縁部が階段形状をなしている。 1 to 3 show a first embodiment. In the backlight device 10 of the first embodiment, the three optical sheets 15a, 15b, and 15c constituting the optical sheet laminate 15 are made smaller as they are closer to the liquid crystal panel 1 supported by the liquid crystal panel base 12, As a result, the edge of the optical sheet laminate 15 has a stepped shape.
　光学シート１５ａ、１５ｂ、１５ｃの端と液晶パネル台１２の間には隙間が存在するので、図３に示すようにＬＥＤ１４が発光すると、ＬＥＤ１４からの出射光の一部が隙間の方に漏れる。しかしながら、光学シート間の隙間を直射状態で照らす光は少ない。これにより、光学シート積層体１５に輝線が生じて光学シート積層体１５の発光面の品位が低下することが抑制される。 Since there is a gap between the ends of the optical sheets 15a, 15b, and 15c and the liquid crystal panel base 12, when the LED 14 emits light as shown in FIG. 3, part of the light emitted from the LED 14 leaks toward the gap. However, there is little light that illuminates the gaps between the optical sheets in a direct state. Thereby, it is suppressed that a bright line arises in the optical sheet laminated body 15, and the quality of the light emission surface of the optical sheet laminated body 15 falls.
　ＬＥＤ１４から出射した後液晶パネル１２の裏面で反射した光は導光板１３に入光される。これにより入光効率が向上し、導光板１３の面輝度を向上させることができる。 The light reflected from the back surface of the liquid crystal panel 12 after being emitted from the LED 14 enters the light guide plate 13. Thereby, the light incident efficiency is improved, and the surface luminance of the light guide plate 13 can be improved.
　図４では、中央にバックライト装置１０の概略平面図が配置され、概略平面図の中のＡ－Ａ′線に沿った箇所の輝度分布のグラフが上方に配置され、概略平面図の中のＢ－Ｂ′線に沿った箇所の輝度分布のグラフが下方に配置されている。グラフ中の実線は実施形態１の構造による輝度分布、破線は図１０から図１２に示した従来構造による輝度分布を表している。 In FIG. 4, a schematic plan view of the backlight device 10 is arranged at the center, and a graph of luminance distribution at a location along the line AA ′ in the schematic plan view is arranged at the top. A graph of the luminance distribution at the location along the line BB ′ is arranged below. The solid line in the graph represents the luminance distribution according to the structure of the first embodiment, and the broken line represents the luminance distribution according to the conventional structure shown in FIGS.
　Ａ－Ａ′線に沿った箇所の輝度分布を比較すると、従来構造では輝度のムラが大きいのに対し、実施形態１の構造では輝度のムラが小さい。これは、従来構造では輝線を視認できる可能性があり得るのに対し、実施形態１の構造では輝線は殆ど視認できないことを示す。 Comparing the luminance distributions along the line AA ′, the luminance unevenness is large in the conventional structure, whereas the luminance unevenness is small in the structure of the first embodiment. This indicates that the bright line can be visually recognized in the conventional structure, whereas the bright line is hardly visible in the structure of the first embodiment.
　Ｂ－Ｂ′線に沿った箇所の輝度分布を比較すると、従来構造では輝度が全体的に低いのに対し、実施形態１の構造では輝度が高くなっている。これは、実施形態１の構造では光源からの出射光がより有効に活用されていることを示す。 Comparing the luminance distributions along the line BB ′, the luminance of the conventional structure is low overall, whereas the luminance of the structure of the first embodiment is high. This indicates that the light emitted from the light source is more effectively utilized in the structure of the first embodiment.
　図５に第２実施形態を示す。第２実施形態は液晶パネル台１２の構造に特徴を有する。すなわち液晶パネル台１２には裏面加工が施されるものであり、その裏面加工は光学シート積層体１５の縁部の階段形状に対応する階段形状１２ａの形成である。 FIG. 5 shows a second embodiment. The second embodiment is characterized by the structure of the liquid crystal panel base 12. That is, the back surface processing is performed on the liquid crystal panel base 12, and the back surface processing is the formation of the step shape 12 a corresponding to the step shape of the edge of the optical sheet laminate 15.
　液晶パネル台１２の裏面に階段形状１２ａを形成したことにより、光学シート１５ａ、１５ｂ、１５ｃと液晶パネル台１２との隙間を確保しつつ、ＬＥＤ１４からの出射光がその隙間に入る割合をより少なくできる。これにより、第１実施形態よりもさらに輝度のムラを小さくして輝線の発生を抑制することができる。また光学シート積層体１５の全般的な輝度を高めることができる。 By forming the staircase shape 12a on the back surface of the liquid crystal panel base 12, the gap between the optical sheets 15a, 15b and 15c and the liquid crystal panel base 12 is secured, and the ratio of the light emitted from the LED 14 entering the gap is smaller. it can. Thereby, it is possible to further reduce luminance unevenness and suppress generation of bright lines as compared to the first embodiment. Further, the overall brightness of the optical sheet laminate 15 can be increased.
　液晶パネル台１２の裏面に階段形状１２ａが形成されるのは、導光板１３の中でＬＥＤ１４が向き合わせられた辺（以下これを「入光辺」と称する）だけではない。図６に示す通り、入光辺以外の辺にも階段形状１２ａが形成されている。ここでも光学シート１５ａ、１５ｂ、１５ｃと液晶パネル台１２との隙間を確保しつつ、ＬＥＤ１４からの出射光がその隙間に入る割合をより少なくし、輝度のムラを小さくして輝線の発生を抑制することができる。また光学シート積層体１５の全般的な輝度を高めることができる。 The reason why the staircase shape 12a is formed on the back surface of the liquid crystal panel base 12 is not only the side of the light guide plate 13 where the LEDs 14 face each other (hereinafter referred to as “light incident side”). As shown in FIG. 6, a staircase shape 12 a is also formed on a side other than the light incident side. Again, while ensuring a gap between the optical sheets 15a, 15b, and 15c and the liquid crystal panel base 12, the ratio of the light emitted from the LED 14 to the gap is reduced to reduce unevenness in luminance and suppress the generation of bright lines. can do. Further, the overall brightness of the optical sheet laminate 15 can be increased.
　図７に第３実施形態を示す。第３実施形態の特徴とする点は、液晶パネル台１２の裏面の階段形状１２ａの角が丸められ、アール部１２ｂとされている点である。これにより、振動や衝撃で光学シート１５ｃ、１５ｂ、１５ａが液晶パネル台１２に接触したとしても、鋭い角で光学シート１５ｃ、１５ｂ、１５ａに傷がつき、あるいは光学シート１５ｃ、１５ｂ、１５ａが破損することを避けることができる。 FIG. 7 shows a third embodiment. The feature of the third embodiment is that the corner of the stepped shape 12a on the back surface of the liquid crystal panel base 12 is rounded to form a rounded portion 12b. As a result, even if the optical sheets 15c, 15b, 15a come into contact with the liquid crystal panel base 12 due to vibration or impact, the optical sheets 15c, 15b, 15a are scratched at sharp angles, or the optical sheets 15c, 15b, 15a are damaged. You can avoid doing that.
　図８に第４実施形態を示す。第４実施形態の特徴とする点は、液晶パネル台１２の裏面加工として、階段形状１２ａの形成及びアール部１２ｂの形成に加え、反射シート１７が貼り付けられている点である。 FIG. 8 shows a fourth embodiment. The feature of the fourth embodiment is that, as the back surface processing of the liquid crystal panel base 12, in addition to the formation of the staircase shape 12a and the formation of the rounded portion 12b, a reflection sheet 17 is attached.
　反射シート１７には反射シート１６と同様の高反射のものが選択される。すなわち白色ＰＥＴ反射シートや液晶ポリマー等で反射率の高いもの（反射率約７０～９５％）のものが選択される。 As the reflection sheet 17, a highly reflective sheet similar to the reflection sheet 16 is selected. That is, a white PET reflective sheet or liquid crystal polymer having a high reflectance (reflectance of about 70 to 95%) is selected.
　このように高反射の反射シート１７を貼り付けたことにより、ＬＥＤ１４からの出射光が液晶パネル台１２の裏面で反射する際に液晶パネル台１２によって吸収される率が少なくなり、光をより有効に活用できる。 By attaching the highly reflective reflection sheet 17 in this way, the rate at which the light emitted from the LED 14 is absorbed by the liquid crystal panel base 12 when reflected by the back surface of the liquid crystal panel base 12 is reduced, making the light more effective. Can be used for
　図９に第５実施形態を示す。第５実施形態の特徴とする点は、液晶パネル台１２の裏面加工として、階段形状１２ａの形成及びアール部１２ｂの形成に加え、反射層１８のコーティングが施されている点である。 FIG. 9 shows a fifth embodiment. The feature of the fifth embodiment is that, as the back surface processing of the liquid crystal panel base 12, in addition to the formation of the stepped shape 12a and the formation of the rounded portion 12b, the reflective layer 18 is coated.
　反射層１８は、例えば鏡面反射の銀メッキにより形成することができる。鏡面反射の銀メッキ層は、反射率約７０～９５％と高反射にすることができる。 The reflective layer 18 can be formed by, for example, specular reflection silver plating. The specular reflection silver plating layer can be highly reflective with a reflectance of about 70 to 95%.
　このように高反射の反射層１８を形成したことにより、ＬＥＤ１４からの出射光が液晶パネル台１２の裏面で反射する際に液晶パネル台１２によって吸収される率が少なくなり、光をより有効に活用できる。 By forming the highly reflective reflective layer 18 in this way, the rate at which the light emitted from the LED 14 is absorbed by the liquid crystal panel base 12 when reflected by the back surface of the liquid crystal panel base 12 is reduced, and the light is more effectively used. Can be used.
　第５実施形態では、導光板１３の対向２辺が入光辺となっている。 In the fifth embodiment, two opposite sides of the light guide plate 13 are incident sides.
　第２実施形態の場合と同様に、第３実施形態から第５実施形態までの液晶パネル台１２の裏面加工を、入光辺以外の辺においても施すことが可能である。 Similarly to the case of the second embodiment, it is possible to perform the back surface processing of the liquid crystal panel base 12 from the third embodiment to the fifth embodiment on the sides other than the light incident side.
　以上、本発明の実施形態につき説明したが、本発明の範囲はこれに限定されるものではなく、発明の主旨を逸脱しない範囲で種々の変更を加えて実施することができる。 The embodiment of the present invention has been described above, but the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention.
　本発明はエッジライト方式のバックライトに広く適用可能である。 The present invention is widely applicable to edge light type backlights.
　　　１　　液晶パネル
　　　１０　バックライト装置
　　　１１　シャーシ
　　　１２　液晶パネル台
　　　１２ａ　階段形状
　　　１２ｂ　アール部
　　　１３　導光板
　　　１４　ＬＥＤ
　　　１５　光学シート積層体
　　　１５ａ、１５ｂ、１５ｃ　光学シート
　　　１６　反射シート
　　　１７　反射シート
　　　１８　反射層 DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 10 Backlight apparatus 11 Chassis 12 Liquid crystal panel stand 12a Staircase shape 12b Earl part 13 Light guide plate 14 LED
DESCRIPTION OF SYMBOLS 15 Optical sheet laminated body 15a, 15b, 15c Optical sheet 16 Reflective sheet 17 Reflective sheet 18 Reflective layer

Claims (8)

  1. 　バックライト装置であって、以下の構成を備えるもの：
    　トレイ状のシャーシと、前記シャーシの表面に重ねられるエッジライト方式の導光板と、前記導光板の表面に重ねられる光学シート積層体と、前記シャーシの口縁部に固定され、裏面で前記光学シート積層体を抑え込む液晶パネル台とを備えたバックライト装置において、
    　前記光学シート積層体は、それを構成する複数の光学シートが前記液晶パネル台に支持される液晶パネルに近いものほど小さくなり、縁部が階段形状をなす。     Backlight device having the following configuration:
    A tray-shaped chassis, an edge light type light guide plate overlaid on the surface of the chassis, an optical sheet laminate overlaid on the surface of the light guide plate, and the optical sheet fixed on the mouth edge of the chassis and on the back surface In a backlight device having a liquid crystal panel base for suppressing the laminate,
    In the optical sheet laminate, the closer the optical sheet constituting the optical sheet is to the liquid crystal panel supported by the liquid crystal panel base, the smaller the edge, and the edges form a stepped shape.
  2. 　請求項１のバックライト装置であって、以下の構成を備えるもの：
    　前記液晶パネル台には裏面加工が施されるものであり、前記裏面加工は前記光学シート積層体の縁部の階段形状に対応する階段形状の形成である。     The backlight device of claim 1, comprising the following configuration:
    The liquid crystal panel base is subjected to back surface processing, and the back surface processing is formation of a step shape corresponding to the step shape of the edge of the optical sheet laminate.
  3. 　請求項２のバックライト装置であって、以下の構成を備えるもの：
    　前記液晶パネル台の階段形状は、角が丸められている。     The backlight device according to claim 2, comprising the following configuration:
    The step shape of the liquid crystal panel base has rounded corners.
  4. 　請求項１のバックライト装置であって、以下の構成を備えるもの：
    　前記液晶パネル台には裏面加工が施されるものであり、前記裏面加工は反射シートの貼り付けである。     The backlight device of claim 1, comprising the following configuration:
    The liquid crystal panel base is subjected to back surface processing, and the back surface processing is pasting of a reflection sheet.
  5. 　請求項１のバックライト装置であって、以下の構成を備えるもの：
    　前記液晶パネル台には裏面加工が施されるものであり、前記裏面加工は反射層のコーティングである。     The backlight device of claim 1, comprising the following configuration:
    The liquid crystal panel base is subjected to back surface processing, and the back surface processing is a coating of a reflective layer.
  6. 　請求項２のバックライト装置であって、以下の構成を備えるもの：
    　前記導光板は複数の辺を入光辺とするものであり、前記入光辺毎に前記液晶パネル台の裏面加工が施される。     The backlight device according to claim 2, comprising the following configuration:
    The light guide plate has a plurality of sides as incident sides, and the back surface of the liquid crystal panel base is processed for each incident side.
  7. 　請求項２のバックライト装置であって、以下の構成を備えるもの：
    　前記導光板の入光辺以外の辺においても前記液晶パネル台の裏面加工が施される。     The backlight device according to claim 2, comprising the following configuration:
    The back surface processing of the liquid crystal panel base is also performed on sides other than the light incident side of the light guide plate.
  8. 　液晶表示装置であって、以下の構成を備えるもの：
    　請求項１から７のいずれかのバックライト装置を液晶パネルに組み合わせた。     A liquid crystal display device having the following configuration:
    The backlight device according to any one of claims 1 to 7 is combined with a liquid crystal panel.
PCT/JP2012/073405 2011-11-11 2012-09-13 Backlight device and liquid crystal display device provided with same WO2013069371A1 (en)

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