WO2013155699A1 - 背光模块以及液晶显示装置 - Google Patents

背光模块以及液晶显示装置 Download PDF

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Publication number
WO2013155699A1
WO2013155699A1 PCT/CN2012/074429 CN2012074429W WO2013155699A1 WO 2013155699 A1 WO2013155699 A1 WO 2013155699A1 CN 2012074429 W CN2012074429 W CN 2012074429W WO 2013155699 A1 WO2013155699 A1 WO 2013155699A1
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Prior art keywords
light
guide plate
light guide
plane
disposed
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PCT/CN2012/074429
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English (en)
French (fr)
Inventor
黄建发
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深圳市华星光电技术有限公司
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Priority to US13/511,658 priority Critical patent/US20150029440A1/en
Publication of WO2013155699A1 publication Critical patent/WO2013155699A1/zh

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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
    • G02B6/0013—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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/045—Light guides
    • 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
    • G02B6/0033—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
    • 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
    • G02B6/0091—Positioning aspects of the light source relative to the light guide

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a backlight module and a liquid crystal display device capable of eliminating light leakage from the bottom surface of a light guide plate.
  • Liquid crystal display (Liquid Crystal Display, LCD) has been widely used in a variety of electronic products, most of which are backlit LCDs, including liquid crystal display panels and backlight modules (backlight Module).
  • the backlight module can be divided into a side-light type and a direct-light type according to the incident position of the light source (Direct-light) Type) Two to provide a backlight to the LCD panel.
  • Direct-light Direct-light
  • FIG. 1 is a schematic structural view of a conventional side-lit light-emitting backlight module.
  • 101 is a light guide plate
  • 102 is a light source
  • 103 is a reflective element
  • 104 is a reflective sheet
  • the base is 105.
  • the reflective sheet 104 due to the presence of the reflective sheet 104, the light guide plate 101 and the base 105 and the light guide plate are caused.
  • the light emitted from the light source 102 can be incident from the bottom of the light incident side of the light guide plate 101, thereby forming a mura on the corresponding display panel, which seriously affects the display effect of the liquid crystal display. .
  • the present invention provides a backlight module and a liquid crystal display device by changing the arrangement of a light guide plate and a reflection sheet, to solve the backlight module and the liquid crystal display device of the prior art, which are between the light guide plate and the base, and between the light guide plate and the reflection sheet.
  • the technical problem of spots on the corresponding display panel caused by the gap is not limited.
  • the invention relates to a backlight module, which comprises: a light guide plate; a pedestal disposed at a bottom of the light incident side of the light guide plate; a light source disposed on the pedestal; and a reflective element configured to reflect light emitted by the light source to a light incident surface of the light guide plate; And a reflective sheet disposed at a bottom of the light guide plate for reflecting light traveling to a bottom surface of the light guide plate, wherein the light guide plate and the reflective sheet are connected by a double-sided tape, and the double-sided tape is disposed on the An edge of the bottom surface of the light guide plate, a light exit surface of the light source, a bottom surface of the light guide plate, and a light exit surface of the light guide plate are parallel to each other, and a plane of the light exit surface of the light source is disposed on a plane of the bottom surface of the light guide plate And a plane of the light-emitting surface of the light guide plate; the width of the double-sided tape is D, and the distance between the plane of
  • the present invention also relates to a backlight module including: a light guide plate; a susceptor disposed at a bottom of the light incident side of the light guide plate; a light source disposed on the pedestal; and a reflective element for illuminating the light source The emitted light is reflected on a light incident surface of the light guide plate; and a reflective sheet is disposed at a bottom of the light guide plate for reflecting light traveling to a bottom surface of the light guide plate, the light guide plate and the reflective sheet
  • the double-sided tape is disposed at an edge of the bottom surface of the light guide plate, and the light-emitting surface of the light source, the bottom surface of the light guide plate, and the light-emitting surface of the light guide plate are parallel to each other, and the light source is The plane of the light exiting surface is disposed between the plane of the bottom surface of the light guide plate and the plane of the light exit surface of the light guide plate.
  • the width of the double-sided tape is D
  • the distance between the plane of the bottom surface of the light guide plate and the plane of the light-emitting surface of the light source is H
  • the refractive index of the light guide plate The rate is n
  • the ratio of H to the D is greater than 0.8*tg [acrsin(1/n)].
  • the ratio of the H to the D is greater than tg[acrsin(1/n)].
  • the double-sided tape is disposed on an edge of the light incident side of the bottom surface.
  • the material of the light guide plate is a photocurable resin, polymethyl methacrylate or polycarbonate.
  • the reflective element is a single-plane reflective sheet, a multi-planar reflective sheet or a curved reflective sheet.
  • the susceptor is a printed circuit board or a flexible printed circuit board.
  • the backlight module further includes an optical film disposed on a light-emitting surface of the light guide plate for improving a light-emitting effect of the backlight module.
  • the present invention also relates to a liquid crystal display device comprising: a display panel; and a backlight module comprising: a light guide plate; a base disposed at a bottom of the light incident side of the light guide plate; and a light source disposed on the base a reflective element for reflecting light emitted by the light source to a light incident surface of the light guide plate, and a reflective sheet disposed at a bottom of the light guide plate for reflecting light traveling to a bottom surface of the light guide plate
  • the light guide plate and the reflective sheet are connected by a double-sided tape, the double-sided tape is disposed at an edge of a bottom surface of the light guide plate, a light-emitting surface of the light source, a bottom surface of the light guide plate, and the light guide plate
  • the light-emitting surfaces are parallel to each other, and a plane of the light-emitting surface of the light source is disposed between a plane of the bottom surface of the light guide plate and a plane of the light-emitting surface of the light
  • the width of the double-sided tape is D
  • the distance between the plane of the bottom surface of the light guide plate and the plane of the light-emitting surface of the light source is H
  • the light guide plate is The refractive index is n
  • the ratio of H to the D is greater than 0.8*tg [acrsin(1/n)].
  • the ratio of the H to the D is larger than tg [acrsin (1/n)].
  • the double-sided tape is provided on an edge of the light incident side of the bottom surface.
  • the material of the light guide plate is a photocurable resin, polymethyl methacrylate or polycarbonate.
  • the reflective element is a single-plane reflective sheet, a multi-planar reflective sheet or a curved reflective sheet.
  • the susceptor is a printed circuit board or a flexible printed circuit board.
  • the backlight module further includes an optical film disposed on a light-emitting surface of the light guide plate for improving a light-emitting effect of the backlight module.
  • FIG. 1 is a schematic structural view of a conventional lateral light-incorporating backlight module
  • FIG. 2 is a schematic structural view of a preferred embodiment of a backlight module of the present invention.
  • FIG. 2 is a schematic structural view of a preferred embodiment of a backlight module of the present invention.
  • the backlight module 200 includes a light guide plate 201, a light source 202, a reflective element 203, a reflective sheet 204, a susceptor 205, and an optical diaphragm 206.
  • the light guide plate 201 is disposed on the back plate (not shown) for guiding the light of the light source 202; the base 205 is disposed at the bottom of the light incident side of the light guide plate 201; and the base 205 is provided with the light source 202 for The light is emitted into the light guide plate 201 and guided by the light guide plate 201.
  • the reflective element 203 is disposed on the light incident side of the light guide plate 201 for reflecting the light emitted from the light source 202 to the light incident surface of the light guide plate 201.
  • the reflection sheet 204 is disposed at the bottom of the light guide plate 201 for reflecting the light traveling to the bottom surface of the light guide plate 201.
  • the optical film 206 is disposed on the light exit surface of the light guide plate 201 for improving the light output effect of the backlight module 200. .
  • the light guide plate 201 and the reflection sheet 204 are connected by the double-sided tape 207, and the double-sided tape 207 is disposed on the light-incident side edge of the bottom surface of the light guide plate 201 (of course, it can also be disposed on all edges of the bottom surface), and the light source 202
  • the light-emitting surface, the bottom surface of the light guide plate 201, and the light-emitting surface of the light guide plate 201 are parallel to each other, and the plane of the light-emitting surface of the light source 202 is disposed between the plane of the bottom surface of the light guide plate 201 and the plane of the light-emitting surface of the light guide plate 201.
  • the light-emitting surface of the light source 202, the bottom surface of the light guide plate 201, and the light-emitting surface of the light guide plate 201 are parallel to each other, and the plane of the light-emitting surface of the light source 202 is disposed on the plane of the bottom surface of the light guide plate 201 and Between the planes of the light-emitting surfaces of the light guide plate 201, it can be seen from the figure that the bottom surface of the light guide plate 201 is lower than the light-emitting surface of the light source 202, and the light guide plate 201 is passed through the double-sided tape 207 on the light-incident side of the light guide plate 201. It is bonded to the reflection sheet 204 to ensure that light is not incident from the bottom surface of the light guide plate 201.
  • the double-sided tape 207 will break the total reflection of the light in the light guide plate 201 to form a bright line on the corresponding display panel, so it is necessary to ensure that the adhesive area of the double-sided tape 207 is located.
  • the light-free area of the light panel 201 As shown in FIG. 2, the width of the double-sided tape 207 is D, the distance between the plane of the bottom surface of the light guide plate 201 and the plane of the light exit surface of the light source 202 is H, and the refractive index of the light guide plate 201 is n.
  • the polymethyl methacrylate material has a refractive index n close to 1.52 and an air refractive index of 1.
  • the light in the light panel 201 has no influence, and the display quality of the corresponding display panel is ensured.
  • the user can appropriately widen the width of the double-sided tape 207. It has been experimentally proved that the ratio of the distance H to the width D is 0.8*tg [acrsin(1/n When the double-sided tape 207 has an influence on the light in the light guide plate 201, it is negligible. In this way, while ensuring the display quality of the corresponding display panel, the bonding effect of the light guide plate 201 and the reflection sheet 204 is ensured, so that the light guide plate 201 and the reflection sheet 204 are less likely to be leaked due to the detachment.
  • the material of the light guide plate 201 may be a photocurable resin, polymethyl methacrylate or polycarbonate.
  • the reflective element 203 can be a single planar reflective sheet, a multi-planar reflective sheet or a curved reflective sheet. In this embodiment, the reflective element 203 can also be a wedge-shaped reflector.
  • the light source 202 in the present invention is, for example, a cold cathode lamp (Cold) Cathode Fluorescent Lamp, CCFL), Light Emitting Diode (LED), Organic Light Emitting Diode (Organic) Light Emitting Diode, OLED), Electro-Luminescence (EL), Light Bar (Light) Bar) or any combination of the above.
  • the pedestal 205 is, for example, a printed circuit board (PCB) or a flexible printed circuit board (Flexible Printed) Circuits, FPC)
  • the reflection sheet 204 in the present invention is a reflection film having a high reflectance material.
  • the high reflectivity material may be, for example, silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, an alloy of any combination thereof, yellowing resistant and heat resistant.
  • the optical film 206 in the present invention may be a diffusion sheet, a prism sheet, or a reverse prism sheet (Turning Prism) Sheet), Brightness Enhancement Film (BEF), Reflective Brightness Enhancement Film (Dual Brightness Enhancement) Film, DBEF), Diffused Reflective Polarizer Film (DRPF) or any combination of the above.
  • BEF Brightness Enhancement Film
  • DBEF Reflective Brightness Enhancement Film
  • DRPF Diffused Reflective Polarizer Film
  • the present invention also relates to a liquid crystal display device including a display panel and a backlight module, the backlight module including a light guide plate, a base disposed at a bottom of the light incident side of the light guide plate, and reflecting light emitted from the light source to the guide A reflective element on the light incident surface of the light plate and a reflective sheet disposed at the bottom of the light guide plate for reflecting light traveling to the bottom surface of the light guide plate.
  • the light guide plate and the reflection sheet are connected by a double-sided tape, and the double-sided tape is disposed at an edge of the bottom surface of the light guide plate, and the light-emitting surface of the light source, the bottom surface of the light guide plate, and the light-emitting surface of the light guide plate are parallel to each other, and the plane of the light-emitting surface of the light source is disposed at The plane of the bottom surface of the light guide plate and the plane of the light exit surface of the light guide plate.
  • the width of the double-sided tape is D
  • the distance between the plane of the bottom surface of the light guide plate and the plane of the light exit surface of the light source is H
  • the refractive index of the light guide plate is n
  • the ratio of the distance H to the width D is greater than 0.8*tg [acrsin( 1/n)].
  • the backlight module and the liquid crystal display device of the present invention solve the technical problem that the corresponding display panel has spots due to the gap between the light guide plate and the pedestal and the light guide plate and the reflection sheet by changing the arrangement of the light guide plate and the reflection sheet. At the same time, it is ensured that the double-sided tape does not affect the light in the light guide plate, and the display quality of the corresponding display panel is ensured.

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

Abstract

一种背光模块以及相应的液晶显示装置，背光模块包括导光板（201）、基座（205）、光源（202）、反射元件（203）以及反射片（204），导光板（201）与反射片（204）通过双面胶连接，双面胶设置在导光板底面的边缘，光源的出光面所在平面设置在导光板的底面所在平面以及导光板出光面所在平面之间。通过改变导光板和反射片的设置解决了相应显示面板出现斑点的问题。

Description

背光模块以及液晶显示装置 技术领域
本发明涉及液晶显示领域，特别是涉及一种可消除导光板底面漏光的背光模块以及液晶显示装置。
 背景技术
液晶显示器(Liquid Crystal Display，LCD)已被广泛应用于各种电子产品中，液晶显示器大部分为背光型液晶显示器，其包括液晶显示面板及背光模块(backlight module)。背光模块可依照光源入射位置的不同分成侧向式入光(Side-light type)与直下式入光(Direct-light type)两种，以便提供背光源至液晶显示面板。
如图1所示，图1为现有的侧向式入光的背光模块的结构示意图。其中101为导光板，102为光源，103为反射元件，104为反射片，基座为105，从图中可见，由于反射片104的存在，导致导光板101与基座105之间以及导光板101与反射片104之间均存在间隙，光源102射出的光线可以从导光板101的入光侧的底部入射，从而在相应的显示面板上形成斑点（mura），严重的影响液晶显示器的显示效果。
故，有必要提供一种背光模块以及液晶显示装置，以解决现有技术所存在的问题。
 技术问题
本发明提供一种通过改变导光板和反射片的设置的背光模块以及液晶显示装置，以解决现有技术的背光模块以及液晶显示装置由于导光板与基座、以及导光板与反射片之间的间隙导致的相应显示面板出现斑点的技术问题。
 技术解决方案
本发明涉及一种背光模块，其中包括：导光板； 基座，设置在所述导光板的入光侧的底部；光源，设置在所述基座上；反射元件，用于将所述光源发出的光反射到所述导光板的入光面上；以及反射片，设置在所述导光板的底部，用于反射行进至导光板的底面上的光线，所述导光板和所述反射片通过双面胶连接，所述双面胶设置在所述导光板的底面的边缘，所述光源的出光面、所述导光板的底面以及所述导光板的出光面相互平行，且所述光源的出光面所在平面设置在所述导光板的底面所在平面以及所述导光板的出光面所在平面之间；所述双面胶的宽度为D，所述导光板的底面所在平面与所述光源的出光面所在平面之间的距离为H，所述导光板的折射率为n，所述H与所述D的比值大于0.8*tg[acrsin（1/n）]；所述双面胶设置在所述底面的入光侧的边缘。
本发明还涉及一种背光模块，其中包括：导光板；基座，设置在所述导光板的入光侧的底部；光源，设置在所述基座上；反射元件，用于将所述光源发出的光反射到所述导光板的入光面上；以及反射片，设置在所述导光板的底部，用于反射行进至导光板的底面上的光线，所述导光板和所述反射片通过双面胶连接，所述双面胶设置在所述导光板的底面的边缘，所述光源的出光面、所述导光板的底面以及所述导光板的出光面相互平行，且所述光源的出光面所在平面设置在所述导光板的底面所在平面以及所述导光板的出光面所在平面之间。
在本发明所述的背光模块中，所述双面胶的宽度为D，所述导光板的底面所在平面与所述光源的出光面所在平面之间的距离为H，所述导光板的折射率为n，所述H与所述D的比值大于0.8*tg[acrsin（1/n）]。
在本发明所述的背光模块中，所述H与所述D的比值大于tg[acrsin（1/n）]。
在本发明所述的背光模块中，所述双面胶设置在所述底面的入光侧的边缘。
在本发明所述的背光模块中，所述导光板的材料为光硬化型树脂、聚甲基丙烯酸甲酯或聚碳酸酯。
在本发明所述的背光模块中，所述反射元件为单平面反射片、多平面反射片或曲面反射片。
在本发明所述的背光模块中，所述基座为印刷电路板或软性印刷电路板。
在本发明所述的背光模块中，所述背光模块还包括光学膜片，所述光学膜片设置在所述导光板的出光面上，用于改善所述背光模块的出光效果。
本发明还涉及一种液晶显示装置，其中包括：显示面板；以及背光模块，包括：导光板；基座，设置在所述导光板的入光侧的底部；光源，设置在所述基座上；反射元件，用于将所述光源发出的光反射到所述导光板的入光面上；以及反射片，设置在所述导光板的底部，用于反射行进至导光板的底面上的光线，所述导光板和所述反射片通过双面胶连接，所述双面胶设置在所述导光板的底面的边缘，所述光源的出光面、所述导光板的底面以及所述导光板的出光面相互平行，且所述光源的出光面所在平面设置在所述导光板的底面所在平面以及所述导光板的出光面所在平面之间。
在本发明所述的液晶显示装置中，所述双面胶的宽度为D，所述导光板的底面所在平面与所述光源的出光面所在平面之间的距离为H，所述导光板的折射率为n，所述H与所述D的比值大于0.8*tg[acrsin（1/n）]。
在本发明所述的液晶显示装置中，所述H与所述D的比值大于tg[acrsin（1/n）]。
在本发明所述的液晶显示装置中，所述双面胶设置在所述底面的入光侧的边缘。
在本发明所述的液晶显示装置中，所述导光板的材料为光硬化型树脂、聚甲基丙烯酸甲酯或聚碳酸酯。
在本发明所述的液晶显示装置中，所述反射元件为单平面反射片、多平面反射片或曲面反射片。
在本发明所述的液晶显示装置中，所述基座为印刷电路板或软性印刷电路板。
在本发明所述的液晶显示装置中，所述背光模块还包括光学膜片，所述光学膜片设置在所述导光板的出光面上，用于改善所述背光模块的出光效果。
 有益效果
通过改变导光板和反射片的设置，以解决现有技术的背光模块以及液晶显示装置由于导光板与基座、以及导光板与反射片之间的间隙导致的相应显示面板出现斑点的技术问题。
 附图说明
图1为现有的侧向式入光的背光模块的结构示意图；
图2为本发明的背光模块的优选实施例的结构示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
在图中，结构相似的单元是以相同标号表示。
请参照图2，图2为本发明的背光模块的优选实施例的结构示意图。背光模块200包括导光板201、光源202、反射元件203、反射片204、基座205以及光学膜片206。导光板201设置在背板（图中未示出）上，用于引导光源202的光线；基座205设置在导光板201的入光侧的底部；基座205上设置有光源202，用于侧向发光至导光板201内，并由导光板201来引导出光；反射元件203设置在导光板201的入光侧的顶部，用于将光源202发出的光反射到导光板201的入光面上；反射片204设置在导光板201的底部，用于反射行进至导光板201的底面上的光线；光学膜片206设置在导光板201的出光面上，用于改善背光模块200的出光效果。在本实施例中，导光板201和反射片204通过双面胶207连接，双面胶207设置在导光板201底面的入光侧的边缘（当然也可设置在底面的全部边缘），光源202的出光面、导光板201的底面以及导光板201的出光面相互平行，且光源202的出光面所在平面设置在导光板201的底面所在平面以及导光板201的出光面所在平面之间。
本实施例的背光模块200使用时，由于光源202的出光面、导光板201的底面以及导光板201的出光面相互平行，且光源202的出光面所在平面设置在导光板201的底面所在平面以及导光板201的出光面所在平面之间，从图中可以看出，即导光板201的底面低于光源202的出光面，同时在导光板201的入光侧通过双面胶207将导光板201和反射片204粘贴在一起，从而确保了光线不会从导光板201的底面射入。
但是当光线入射到双面胶207粘贴的区域时，双面胶207会破坏导光板201中光线的全反射而在相应的显示面板上形成亮线，因此要确保双面胶207粘贴区域位于导光板201的无光线区域。如图2中所示，双面胶207的宽度为D，导光板201的底面所在平面与光源202的出光面所在平面之间的距离为H，导光板201的折射率为n。下面以聚甲基丙烯酸甲酯材料的导光板201为例，聚甲基丙烯酸甲酯材料的折射率n接近1.52，空气折射率为1。根据光学折射定律，导光板201中的最大折射角Ө不会超过acrsin（1/n），即41.1度。因此当距离H与宽度D的比值大于tg[acrsin（1/n）]=0.87时，入射到导光板201中的光线将不会射到双面胶207上，确保了双面胶207对导光板201中的光线无影响，保证了相应显示面板的显示品质。
同时由于大角度入射导光板201的光线非常稀少，因此使用者可以将双面胶207的宽度适当的放宽，经试验证明，当距离H与宽度D的比值为0.8*tg[acrsin（1/n）]时，双面胶207对导光板201中光线的影响可以忽略不计。这样在保证相应显示面板的显示品质的同时，还确保了导光板201和反射片204的粘贴效果，使得导光板201和反射片204不易因脱离而导致导光板201的底面漏光。
本发明的背光模块200中，导光板201的材料可为光硬化型树脂、聚甲基丙烯酸甲酯或聚碳酸酯。反射元件203可为单平面反射片、多平面反射片或曲面反射片。在本实施例中，反射元件203也可为楔形反射件。本发明中的光源202例如为冷阴极灯管(Cold Cathode Fluorescent Lamp，CCFL)、发光二极管(Light Emitting Diode，LED)、有机发光二极管(Organic Light Emitting Diode，OLED)、电激发光组件(Electro-Luminescence，EL)、发光灯条(Light Bar)或上述的任意组合。基座205例如为印刷电路板(Printed circuit board，PCB)或软性印刷电路板(Flexible Printed Circuits，FPC)
本发明中的反射片204为反射膜片，其具有高反射率材料。此高反射率材料可例如为银、铝、金、铬、铜、铟、铱、镍、铂、铼、铑、锡、钽、钨、锰、上述任意组合的合金、耐黄化且耐热的白色反射漆料或上述材料的任意组合，以反射光线。
本发明中的光学膜片206可为扩散片、棱镜片、逆棱镜片(Turning Prism Sheet)、增亮膜(Brightness Enhancement Film，BEF)、反射式增亮膜(Dual Brightness Enhancement Film，DBEF)、非多层膜式反射偏光片(Diffused Reflective Polarizer Film，DRPF)或上述的任意组合。
本发明还涉及一种液晶显示装置，其中包括显示面板以及背光模块，背光模块包括导光板、设置在导光板的入光侧的底部的基座、用于将光源发出的光反射到所述导光板的入光面上的反射元件以及设置在所述导光板的底部，用于反射行进至导光板的底面上的光线的反射片。导光板和反射片通过双面胶连接，双面胶设置在导光板的底面的边缘，光源的出光面、导光板的底面以及导光板的出光面相互平行，且光源的出光面所在平面设置在导光板的底面所在平面以及导光板的出光面所在平面之间。双面胶的宽度为D，导光板的底面所在平面与光源的出光面所在平面之间的距离为H，导光板的折射率为n，距离H与宽度D的比值大于0.8*tg[acrsin（1/n）]。本发明的液晶显示装置的工作原理和有益效果与上述的背光模块的具体实施例中描述的相同或相似，具体请参见上述背光模块的具体实施例。
由上述可知，本发明的背光模块和液晶显示装置通过改变导光板和反射片的设置解决了相应显示面板由于导光板与基座、以及导光板与反射片之间的间隙出现斑点的技术问题，同时确保了双面胶对导光板中的光线不会产生影响，保证了相应显示面板的显示品质。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
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Claims (17)

  1. 一种背光模块，其中包括：
    导光板；
    基座，设置在所述导光板的入光侧的底部；
    光源，设置在所述基座上；
    反射元件，用于将所述光源发出的光反射到所述导光板的入光面上；以及
    反射片，设置在所述导光板的底部，用于反射行进至导光板的底面上的光线，
    所述导光板和所述反射片通过双面胶连接，所述双面胶设置在所述导光板的底面的边缘，所述光源的出光面、所述导光板的底面以及所述导光板的出光面相互平行，且所述光源的出光面所在平面设置在所述导光板的底面所在平面以及所述导光板的出光面所在平面之间；
    所述双面胶的宽度为D，所述导光板的底面所在平面与所述光源的出光面所在平面之间的距离为H，所述导光板的折射率为n，所述H与所述D的比值大于0.8*tg[acrsin（1/n）]；
    所述双面胶设置在所述底面的入光侧的边缘。
  2. 一种背光模块，其中包括：
    导光板；
    基座，设置在所述导光板的入光侧的底部；
    光源，设置在所述基座上；
    反射元件，用于将所述光源发出的光反射到所述导光板的入光面上；以及
    反射片，设置在所述导光板的底部，用于反射行进至导光板的底面上的光线，
    所述导光板和所述反射片通过双面胶连接，所述双面胶设置在所述导光板的底面的边缘，所述光源的出光面、所述导光板的底面以及所述导光板的出光面相互平行，且所述光源的出光面所在平面设置在所述导光板的底面所在平面以及所述导光板的出光面所在平面之间。
  3. 根据权利要求2所述的背光模块，其中所述双面胶的宽度为D，所述导光板的底面所在平面与所述光源的出光面所在平面之间的距离为H，所述导光板的折射率为n，所述H与所述D的比值大于0.8*tg[acrsin（1/n）]。
  4. 根据权利要求3所述的背光模块，其中所述H与所述D的比值大于tg[acrsin（1/n）]。
  5. 根据权利要求2所述的背光模块，其中所述双面胶设置在所述底面的入光侧的边缘。
  6. 根据权利要求2所述的背光模块，其中所述导光板的材料为光硬化型树脂、聚甲基丙烯酸甲酯或聚碳酸酯。
  7. 根据权利要求2所述的背光模块，其中所述反射元件为单平面反射片、多平面反射片或曲面反射片。
  8. 根据权利要求2所述的背光模块，其中所述基座为印刷电路板或软性印刷电路板。
  9. 根据权利要求2所述的背光模块，其中所述背光模块还包括光学膜片，所述光学膜片设置在所述导光板的出光面上，用于改善所述背光模块的出光效果。
  10. 一种液晶显示装置，其中包括：
    显示面板；以及
    背光模块，包括：
    导光板；
    基座，设置在所述导光板的入光侧的底部；
    光源，设置在所述基座上；
    反射元件，用于将所述光源发出的光反射到所述导光板的入光面上；以及
    反射片，设置在所述导光板的底部，用于反射行进至导光板的底面上的光线，
    所述导光板和所述反射片通过双面胶连接，所述双面胶设置在所述导光板的底面的边缘，所述光源的出光面、所述导光板的底面以及所述导光板的出光面相互平行，且所述光源的出光面所在平面设置在所述导光板的底面所在平面以及所述导光板的出光面所在平面之间。
  11. 根据权利要求10所述的液晶显示装置，其中所述双面胶的宽度为D，所述导光板的底面所在平面与所述光源的出光面所在平面之间的距离为H，所述导光板的折射率为n，所述H与所述D的比值大于0.8*tg[acrsin（1/n）]。
  12. 根据权利要求11所述的液晶显示装置，其中所述H与所述D的比值大于tg[acrsin（1/n）]。
  13. 根据权利要求10所述的液晶显示装置，其中所述双面胶设置在所述底面的入光侧的边缘。
  14. 根据权利要求10所述的液晶显示装置，其中所述导光板的材料为光硬化型树脂、聚甲基丙烯酸甲酯或聚碳酸酯。
  15. 根据权利要求10所述的液晶显示装置，其中所述反射元件为单平面反射片、多平面反射片或曲面反射片。
  16. 根据权利要求10所述的液晶显示装置，其中所述基座为印刷电路板或软性印刷电路板。
  17. 根据权利要求10所述的液晶显示装置，其中所述背光模块还包括光学膜片，所述光学膜片设置在所述导光板的出光面上，用于改善所述背光模块的出光效果。
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