WO2014015541A1 - 背光模组 - Google Patents

背光模组 Download PDF

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Publication number
WO2014015541A1
WO2014015541A1 PCT/CN2012/079907 CN2012079907W WO2014015541A1 WO 2014015541 A1 WO2014015541 A1 WO 2014015541A1 CN 2012079907 W CN2012079907 W CN 2012079907W WO 2014015541 A1 WO2014015541 A1 WO 2014015541A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
retaining wall
backlight module
plastic frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/079907
Other languages
English (en)
French (fr)
Inventor
黄建发
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/698,024 priority Critical patent/US9494722B2/en
Publication of WO2014015541A1 publication Critical patent/WO2014015541A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a backlight module for improving the brightness of a light guide plate. Background technique
  • Liquid crystal display has many advantages such as thin body, power saving, and no radiation, and has been widely used.
  • Most of the liquid crystal display devices on the market are backlight type liquid crystal display devices, which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates, and the liquid crystal molecules are controlled to change direction by energization or not, and the light of the backlight module is refracted. Come out to produce the picture. Since the liquid crystal panel itself does not emit light, the light source provided by the backlight module needs to be used to display the image normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different incident positions of the light source.
  • a light source such as a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode) is disposed behind the liquid crystal panel to directly form a surface light source for the liquid crystal panel.
  • the side-lit backlight module has a backlight LED strip (Light bar) disposed on the edge of the back panel behind the liquid crystal panel, and the light emitted by the LED strip light enters the light from the side of the light guide plate (LGP, Light Guide Plate). The surface enters the light guide plate, is reflected and diffused, and is emitted from the light exit surface of the light guide plate, and is supplied to the liquid crystal panel through the optical film group to form a surface light source.
  • LGP Light Guide Plate
  • the plastic frame there is a certain gap between the plastic frame and the light guide plate/optical film in the side-lit backlight module.
  • the light incident on the frame from the LED light source will be emitted to the outside at the gap to form a bright line, which will result in the LED light source.
  • the emitted light causes a loss of brightness of about 3%. Referring to FIG. 2, this is because a part of the light emitted by the LED light source 200 is incident on the frame 600. For this reason, the prior art solution is to oppose the LED light source 200, the light guide plate 300, and the optical frame 600.
  • a reflective layer 700 is disposed at a position of the diaphragm 500 to reflect the light incident on the plastic frame 600, but some light is still reflected into the gap between the light guide plate 300 and the plastic frame 600, thereby escaping into a bright line, thereby causing The brightness loss of light emitted by the LED light source 200.
  • narrow borders (less than 8.0mm) backlight modules are also becoming future developments. The trend, but this phenomenon has become more apparent in the narrow-frame backlight module, which is an urgent problem to be solved. Summary of the invention
  • the object of the present invention is to provide a backlight module, which solves the problem of the bright line on the light incident side of the side-entry backlight module, and improves the brightness of the light guide plate, thereby avoiding the brightness loss of the light emitted by the LED light source and improving LED light source utilization.
  • the present invention provides a backlight module, including: a backplane, a backlight disposed in the backplane, a light guide plate disposed in the backplane and disposed opposite to the backlight, and disposed on the light guide panel and the backplane a reflective sheet, an optical film set disposed on the light guide plate, a plastic frame disposed on the back plate, and a retaining wall disposed between the light guide plate and the plastic frame and disposed opposite to the backlight, the retaining wall being close to the backlight
  • the source side has a slope, and the slope is provided with a reflective layer.
  • the light guide plate has a light exiting surface, and the slope of the retaining wall is at an angle of 5-20° with the light exiting surface of the light guide plate.
  • the retaining wall is a trapezoidal retaining wall.
  • the retaining wall is a right-angled trapezoidal retaining wall.
  • the side wall of the retaining wall has a bottom surface adjacent to the light guide plate.
  • the retaining wall is fixed to the plastic frame by sticking or screwing.
  • the distance between the bottom surface and the light guide plate is 0.2 mm. After assembly, the retaining wall is fixed. Tightly guide the light board.
  • the retaining wall is made of the same material as the plastic frame.
  • the retaining wall is integrally formed with the plastic frame.
  • the reflective layer is a reflective sheet attached to the slope of the retaining wall or a reflective material applied to the slope of the retaining wall.
  • the reflective layer is specular or white diffuse.
  • the color of the glue *1 is black or dark.
  • the invention also provides a backlight module, comprising: a back plate, a backlight disposed in the back plate, a light guide plate disposed in the back plate and disposed opposite to the backlight, and a reflective sheet disposed between the light guide plate and the back plate
  • a backlight module comprising: a back plate, a backlight disposed in the back plate, a light guide plate disposed in the back plate and disposed opposite to the backlight, and a reflective sheet disposed between the light guide plate and the back plate
  • the light guide plate has a light-emitting surface, and the slope of the retaining wall is 5-20 with the light-emitting surface of the light guide plate. Angle;
  • the retaining wall is a trapezoidal retaining wall
  • the retaining wall is a right-angled trapezoidal retaining wall;
  • the retaining wall has a bottom surface adjacent to the light guide plate, and the retaining wall is fixed to the plastic frame by pasting or screwing.
  • the distance between the bottom surface and the light guide plate is 0.2 mm. After assembly, the retaining wall is assembled. Fixedly pressing the light guide plate;
  • the retaining wall is made of the same material as the plastic frame
  • the reflective layer is a reflective sheet adhered to the inclined surface of the retaining wall or a reflective material coated on the inclined surface of the retaining wall;
  • the reflective layer is specular reflection or white diffuse reflection
  • the color of the plastic frame is black or dark.
  • the backlight module of the present invention provides a barrier wall with a reflective layer at a position relative to the backlight between the plastic frame and the light guide plate, and reflects light incident on the retaining wall into the light guide plate to avoid optical
  • the gap between the diaphragm group and the light guide plate is refracted out to form a bright line, which solves the problem of the bright line on the light-incident side of the side-entry backlight module, which has a high coupling efficiency and improves the guidance.
  • the brightness of the light plate avoids the loss of brightness of the light emitted by the LED light source and improves the utilization of the LED light source.
  • Figure 1 is a schematic diagram of a bright line of an existing display screen
  • FIG. 2 is a schematic structural view of a backlight module having a reflective layer in a conventional plastic frame
  • FIG. 3 is a schematic structural view of an embodiment of a backlight module of the present invention.
  • FIG. 4 is a schematic structural view of another embodiment of a backlight module of the present invention. detailed description
  • the present invention provides a backlight module, including: a back plate 1 , a backlight 2 disposed in the back plate 1 , a light guide plate 3 disposed in the back plate 1 and disposed opposite to the backlight 2 , and The reflective sheet 4 between the light guide plate 3 and the back plate 1 , the optical film set 5 disposed on the light guide plate 3 , the plastic frame 6 disposed on the back plate 1 , and the light guide plate 3 and the plastic frame 6 And the gear set relative to the backlight 2
  • the wall 7 has a slope 72 on the side of the backlight 2, and the slope 72 is provided with a reflective layer 8.
  • the light emitted from the backlight 2 and incident on the retaining wall 7 is reflected back to the light guide plate 3 through the reflective layer 8 on the retaining wall 7 to avoid refracting from the gap between the optical film group 5 and the light guide plate 3, which is good.
  • the problem of bright line in the existing backlight module is solved, and the light coupling efficiency is improved, and the brightness of the light guide plate 3 is increased (about 2%-3%), thereby improving energy utilization.
  • the light guide plate 3 has a light emitting surface (not shown), and the inclined surface 72 of the retaining wall 7 and the light emitting surface of the light guide plate 3 are 5-20. Angle.
  • the retaining wall 7 is a trapezoidal retaining wall, preferably a right-angled trapezoidal retaining wall.
  • the retaining wall 7 and the plastic frame 6 are separately designed and fixed to the plastic frame 6 by sticking or screwing, and the retaining wall 7 is made of the same material as the plastic frame 6.
  • the retaining wall 7 has a bottom surface adjacent to the side of the light guide plate 3, wherein the distance between the bottom surface and the light guide plate 3 is 0.2 mm as a processing and assembly tolerance. After assembly, the retaining wall 7 is in contact with the light guide plate 3 to fix The action of the light guide plate 3 is pressed.
  • the reflective layer 8 is a reflective sheet attached to the slope 72 of the retaining wall 7. Without being limited thereto, the reflective layer 8 may also be a reflective material applied to the slope 72 of the retaining wall 7.
  • the reflective layer 8 may be a specularly reflective reflective sheet or a specular reflective layer made of a reflective material, which has better coupling efficiency, and may also be a white diffuse reflective reflective sheet or a reflective diffusing layer made of a reflective material. reduce manufacturing cost.
  • the color of the frame 6 is preferably black or dark.
  • the retaining wall 7 is integrally formed with the plastic frame 6 , and the plastic frame 6 has a position corresponding to the backlight 2 and the light guide plate 3 .
  • the trapezoidal retaining wall T is provided with a reflective layer 8 on the inclined surface 72' of the trapezoidal retaining wall 7', and the light emitted from the backlight 2 and incident on the retaining wall 7 is reflected back to the light guide plate 3 to avoid the optical film group.
  • the present invention provides a backlight module that reflects a light incident on a retaining wall into a light guide plate by providing a retaining wall with a reflective layer at a position relative to the backlight between the plastic frame and the light guide plate. Avoid refracting from the gap between the optical film group and the light guide plate to form a bright line, which solves the problem of bright line on the light-incident side of the side-entry backlight module, and has high coupling efficiency while at the same time Improve the brightness of the light guide plate, avoid the loss of brightness of the light emitted by the LED light source, and improve the utilization of the LED light source.

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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)

Description

背光模组 技术领域
本发明涉及液晶显示领域， 尤其涉及一种提高导光板亮度的背光模 组。 背景技术
液晶显示装置（LCD, Liquid Crystal Display )具有机身薄、 省电、 无 辐射等众多优点， 得到了广泛的应用。 现有市场上的液晶显示装置大部分 为背光型液晶显示装置， 其包括液晶面板及背光模组 （ backlight module ) 。 液晶面板的工作原理是在两片平行的玻璃基板当中放置液晶分 子， 两片玻璃基板中间有许多垂直和水平的细小电线， 通过通电与否来控 制液晶分子改变方向， 将背光模组的光线折射出来产生画面。 由于液晶面 板本身不发光， 需要借由背光模组提供的光源来正常显示影像， 因此， 背 光模组成为液晶显示装置的关键组件之一。 背光模组依照光源入射位置的 不同分成侧入式背光模组与直下式背光模组两种。 直下式背光模组是将发 光光源例如 CCFL(Cold Cathode Fluorescent Lamp , 阴极萤光灯管）或 LED(Light Emitting Diode发光二极管)设置在液晶面板后方， 直接形成面 光源提供给液晶面板。 而侧入式背光模组是将背光源 LED 灯条（Light bar ) 设于液晶面板侧后方的背板边缘， LED 灯条发出的光线从导光板 ( LGP , Light Guide Plate ) 一侧的入光面进入导光板， 经反射和扩散后 从导光板出光面射出， 在经由光学膜片组， 以形成面光源提供给液晶面 板。
请参阅图 1 , 侧入式背光模组中的胶框与导光板 /光学膜片之间存在一 定的空隙。 在正常使用的情况中， 胶框会由于受热或其它原因变形， 或者 空隙较大时， 从 LED 光源入射到胶框上的光会在该缝隙处出射到外面， 形成亮线， 会导致 LED光源发出的光造成 3%左右的亮度损失。 请参阅图 2, 这是因为 LED 光源 200发出的光会有一部分入射到胶框 600上造成 的， 针对该原因， 现有的技术方案是在胶框 600相对 LED光源 200、 导光 板 300及光学膜片 500的位置上设置反射层 700, 将入射胶框 600的光反 射回去， 但仍会有部分光线反射到导光板 300与胶框 600之间的缝隙中， 从而逸出成为亮线， 造成 LED光源 200发出的光的亮度损失。 随着 LED 灯条作为背光源的发展， 窄边框（小于 8.0mm ) 背光模组也成为未来发展 的趋势， 但该现象在窄边框的背光模组中变得尤为明显， 是一个急需解决 的问题。 发明内容
本发明的目的在于提供一种背光模组， 很好地解决侧入式背光模组中 入光侧的亮线问题， 并提高导光板的亮度， 避免了 LED 光源发出的光的 亮度损失， 提高 LED光源利用率。
为实现上述目的， 本发明提供一种背光模组， 包括： 背板、 设于背板 内的背光源、 设于背板内且相对背光源设置的导光板、 设于导光板与背板 之间的反射片、 设于导光板上的光学膜片组、 设于背板上的胶框、 及设于 导光板与胶框之间且相对背光源设置的挡墙， 所述挡墙靠近背光源侧具有 一斜面， 所述斜面上设有一反射层。
所述导光板具有一出光面， 所述挡墙斜面与导光板的出光面成 5-20° 的角度。
所述挡墙为一梯形挡墙。
所述挡墙为一直角梯形挡墙。
所述挡墙靠近导光板一侧具有一底面， 所述挡墙通过粘贴或螺丝锁紧 固定于胶框上， 所述底面与导光板的距离为 0.2mm, 组装后， 所述挡墙固 定压紧导光板。
所述挡墙采用与胶框相同的材质制作而成。
所述挡墙与胶框一体成型。
所述反射层为一粘贴于挡墙斜面上的反射片或涂覆于挡墙斜面上的反 射性材料。
所述反射层为镜面反射或者白色漫反射。
所述胶 *1的颜色为黑色或深色。
本发明还提供一种背光模组， 包括： 背板、 设于背板内的背光源、 设 于背板内且相对背光源设置的导光板、 设于导光板与背板之间的反射片、 设于导光板上的光学膜片组、 设于背板上的胶框、 及设于导光板与胶框之 间且相对背光源设置的挡墙， 所述挡墙靠近背光源侧具有一斜面， 所述斜 面上设有一反射层；
其中， 所述导光板具有一出光面， 所述挡墙斜面与导光板的出光面成 5-20。 的角度；
其中， 所述挡墙为一梯形挡墙；
其中， 所述挡墙为一直角梯形挡墙； 其中， 所述挡墙靠近导光板一侧具有一底面， 所述挡墙通过粘贴或螺 丝锁紧固定于胶框上， 所述底面与导光板的距离为 0.2mm, 组装后， 所述 挡墙固定压紧导光板；
其中， 所述挡墙采用与胶框相同的材质制作而成；
其中， 所述反射层为一粘贴于挡墙斜面上的反射片或涂覆于挡墙斜面 上的反射性材料；
其中， 所述反射层为镜面反射或者白色漫反射；
其中， 所述胶框的颜色为黑色或深色。
本发明的有益效果： 本发明背光模组通过在胶框与导光板之间相对背 光源的位置设置一带有反射层的挡墙， 将入射到挡墙的光线反射进导光板 中， 避免从光学膜片组和导光板之间的缝隙中折射出去， 形成亮线， 4艮好 地解决侧入式背光模组中入光侧的亮线问题， 具有较高的耦光效率的同时 又提高导光板的亮度， 避免了 LED 光源发出的光的亮度损失， 提高 LED 光源利用率。
为了能更进一步了解本发明的特征以及技术内容， 请参阅以下有关本 发明的详细说明与附图， 然而附图仅提供参考与说明用， 并非用来对本发 明加以限制。 附图说明
下面结合附图， 通过对本发明的具体实施方式详细描述， 将使本发明 的技术方案及其它有益效果显而易见。
附图中，
图 1为现有显示屏的亮线示意图；
图 2为现有胶框具有反射层的背光模组的结构示意图；
图 3为本发明背光模组一实施例的结构示意图；
图 4为本发明背光模组另一实施例的结构示意图。 具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果， 以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图 3 , 本发明提供一种背光模组， 包括： 背板 1、 设于背板 1 内的背光源 2、 设于背板 1 内且相对背光源 2设置的导光板 3、 设于导光 板 3与背板 1之间的反射片 4、 设于导光板 3上的光学膜片组 5、 设于背 板 1上的胶框 6、 及设于导光板 3与胶框 6之间且相对背光源 2设置的挡 墙 7, 所述挡墙 7靠近背光源 2侧具有一斜面 72, 所述斜面 72上设有一 反射层 8。 通过挡墙 7上的反射层 8将背光源 2发出、 入射到该挡墙 7的 光线反射回导光板 3 , 避免从光学膜片组 5和导光板 3之间的缝隙中折射 出去， 很好地解决了现有背光模组中的亮线问题， 具有较高的耦光效率的 同时又提高了导光板 3的亮度（约 2%-3% ) , 提高能源利用率。
所述导光板 3具有一出光面 （未标示） ， 所述挡墙 7斜面 72与导光 板 3的出光面成 5-20。 的角度。 在本较佳实施例中， 所述挡墙 7为一梯形 挡墙， 优选为一直角梯形挡墙。
所述挡墙 7与胶框 6分体设计， 并通过粘贴或螺丝锁紧固定于胶框 6 上， 所述挡墙 7采用与胶框 6相同的材质制作而成。 所述挡墙 7靠近导光 板 3 —侧具有一底面， 其中作为加工以及组装公差， 所述底面与导光板 3 的距离为 0.2mm, 组装后， 挡墙 7与导光板 3接触， 起到固定压紧导光板 3的作用。
所述反射层 8为一粘贴于挡墙 7斜面 72上的反射片。 然不限于此， 所述反射层 8也可以为涂覆于挡墙 7斜面 72上的反射性材料。 所述反射 层 8可以采用镜面反射的反射片或者通过反射材料制成镜面反射层， 耦光 效率更佳， 亦可以采用白色漫反射的反射片或者通过反射材料制成白色漫 反射层， 可以进一步降低生产成本。
为了获得较佳的光学效果， 所述胶框 6的颜色优选为黑色或深色。 请参阅图 4, 作为可供选择的一较佳实施例， 所述挡墙 7，与胶框 6，一 体成型， 所述胶框 6，上对应背光源 2及导光板 3 的地方长出一梯形挡墙 T , 所述梯形挡墙 7'的斜面 72'上设有一反射层 8 , 将背光源 2发出、 入射 到该挡墙 7，的光线反射回导光板 3 , 避免从光学膜片组 5和导光板 3之间 的缝隙中折射出去， 很好地解决了现有背光模组中亮线的问题， 具有较高 的耦光效率的同时又提高了导光板 3的亮度（约 2%-3% ) , 提高能源利用 率。
综上所述， 本发明提供一种背光模组， 通过在胶框与导光板之间相对 背光源的位置设置一带有反射层的挡墙， 将入射到挡墙的光线反射进导光 板中， 避免从光学膜片组和导光板之间的缝隙中折射出去， 形成亮线， 很 好地解决侧入式背光模组中入光侧的亮线问题， 具有较高的耦光效率的同 时又提高导光板的亮度， 避免了 LED 光源发出的光的亮度损失， 提高 LED光源利用率。
以上所述， 对于本领域的普通技术人员来说， 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形， 而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
1、 一种背光模组， 包括： 背板、 设于背板内的背光源、 设于背板内 且相对背光源设置的导光板、 设于导光板与背板之间的反射片、 设于导光 板上的光学膜片组、 设于背板上的胶框、 及设于导光板与胶框之间且相对 背光源设置的挡墙， 所述挡墙靠近背光源侧具有一斜面， 所述斜面上设有 一反射层。
2、 如权利要求 1 所述的背光模组， 其中， 所述导光板具有一出光 面， 所述挡墙斜面与导光板的出光面成 5-20。 的角度。
3、 如权利要求 2所述的背光模组， 其中， 所述挡墙为一梯形挡墙。
4、 如权利要求 3 所述的背光模组， 其中， 所述挡墙为一直角梯形挡 墙。
5、 如权利要求 3 所述的背光模组， 其中， 所述挡墙靠近导光板一侧 具有一底面， 所述挡墙通过粘贴或螺丝锁紧固定于胶框上， 所述底面与导 光板的距离为 0.2mm, 组装后， 所述挡墙固定压紧导光板。
6、 如权利要求 1 所述的背光模组， 其中， 所述挡墙采用与胶框相同 的材质制作而成。
7、 如权利要求 6 所述的背光模组， 其中， 所述挡墙与胶框一体成 型。
8、 如权利要求 1 所述的背光模组， 其中， 所述反射层为一粘贴于挡 墙斜面上的反射片或涂覆于挡墙斜面上的反射性材料。
9、 如权利要求 8 所述的背光模组， 其中， 所述反射层为镜面反射或 者白色漫反射。
10、 如权利要求 1 所述的背光模组， 其中， 所述胶框的颜色为黑色或 深色。
11、 一种背光模组， 包括： 背板、 设于背板内的背光源、 设于背板内 且相对背光源设置的导光板、 设于导光板与背板之间的反射片、 设于导光 板上的光学膜片组、 设于背板上的胶框、 及设于导光板与胶框之间且相对 背光源设置的挡墙， 所述挡墙靠近背光源侧具有一斜面， 所述斜面上设有 一反射层；
其中， 所述导光板具有一出光面， 所述挡墙斜面与导光板的出光面成 5-20。 的角度；
其中， 所述挡墙为一梯形挡墙； 其中， 所述挡墙为一直角梯形挡墙；
其中， 所述挡墙靠近导光板一侧具有一底面， 所述挡墙通过粘贴或螺 丝锁紧固定于胶框上， 所述底面与导光板的距离为 0.2mm, 组装后， 所述 挡墙固定压紧导光板；
其中， 所述挡墙采用与胶框相同的材质制作而成；
其中， 所述反射层为一粘贴于挡墙斜面上的反射片或涂覆于挡墙斜面 上的反射性材料；
其中， 所述反射层为镜面反射或者白色漫反射；
其中， 所述胶框的颜色为黑色或深色。
PCT/CN2012/079907 2012-07-27 2012-08-10 背光模组 Ceased WO2014015541A1 (zh)

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