WO2013166747A1 - 背光模组 - Google Patents

背光模组 Download PDF

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Publication number
WO2013166747A1
WO2013166747A1 PCT/CN2012/075697 CN2012075697W WO2013166747A1 WO 2013166747 A1 WO2013166747 A1 WO 2013166747A1 CN 2012075697 W CN2012075697 W CN 2012075697W WO 2013166747 A1 WO2013166747 A1 WO 2013166747A1
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WO
WIPO (PCT)
Prior art keywords
backlight
light guide
guide plate
backlight module
heat sink
Prior art date
Application number
PCT/CN2012/075697
Other languages
English (en)
French (fr)
Inventor
萧宇均
张彦学
Original Assignee
深圳市华星光电技术有限公司
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 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to DE112012006210.8T priority Critical patent/DE112012006210T5/de
Priority to US13/517,978 priority patent/US20130301297A1/en
Publication of WO2013166747A1 publication Critical patent/WO2013166747A1/zh

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Classifications

    • 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
    • G02B6/0085—Means for removing heat created by the light source from 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
    • G02B6/0081—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 in particular to a backlight module. 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 backlight module generally includes: a back sheet 100 , a reflective sheet 200 disposed in the back sheet 100 , a light guide plate 300 disposed on the reflective sheet 200 , and a backlight 400 disposed in the back sheet 100 , and a backlight
  • the heat dissipation adhesive (not shown) or a screw (not shown) is tightly fixed on the heat dissipation strip 500, and the heat generated by the backlight 400 is taken out through the heat dissipation strip 500 and transmitted to the backplane 100 to the backplane 100.
  • the bottom plate 102 exchanges heat with the outside air.
  • the heat strip 500 is generally an aluminum extruded heat strip. However, due to the high cost of the aluminum extruded heat sink, the aluminum sheet metal heat sink is used instead of the aluminum extruded heat strip, or the backlight 400 is directly fixed on the back board 100 to directly dissipate heat.
  • Thinning is the development trend of liquid crystal display devices today, and the thickness of the corresponding light guide plate 300 needs to be thinned. However, if the thickness of the light guide plate 300 is thinned, the strength of the light guide plate 300 may be deteriorated, which requires some structure to guide the light guide plate. 300 is supported to the same height as the backlight 400 to ensure the light bar Pieces.
  • the backlight module includes: a back plate 100, a reflective sheet 200 disposed in the back plate 100, and The reflective sheet 200, the light guide plate 300, the backlight 400 disposed in the back plate 100, and the aluminum hot plate 500, the aluminum sheet metal heat sink 500 is provided with a rib 502 for supporting
  • the light guide plate 300 is configured to realize the light guide plate 300 at the same height as the backlight 400.
  • the limitation of the formation causes the backlight 400 to have a distance from the coupling position, and the light guide plate 300 of the reduced thickness forms a sagging phenomenon on the light incident side due to insufficient strength (as shown in FIG. 3), resulting in
  • the error of the coupled light causes a large amount of light emitted by the backlight to be exposed, which not only deteriorates the coupling efficiency, but also causes a bright line region in the vicinity of the light incident surface of the light guide plate 300.
  • An object of the present invention is to provide a backlight module which is simple in structure, low in cost, and advantageous in thinning.
  • the present invention provides a backlight module, including: a back plate, a light guide plate disposed in the back plate, a backlight disposed in the back plate, and a light guide plate and a backlight disposed in the back plate Supporting element.
  • the support element is arranged in a stepped manner.
  • the support member includes a first support portion supporting the backlight and a second support portion connecting the first support portion and supporting the light guide plate.
  • the first support portion and the second support portion are integrally formed.
  • the first support portion and the second support portion are fixedly coupled together by gluing or screwing.
  • the support member is made of a silicone, plastic or metal material; the backlight is a linear LED light source.
  • the backplane includes a bottom plate and a side plate connected to the edge of the bottom plate.
  • the bottom plate and the side plate form an accommodating space, and the light guide plate, the backlight and the supporting component are accommodated in the accommodating space.
  • the heat sink further includes a heat sink disposed on a bottom plate of the back plate and a reflective sheet disposed on a side of the light guide plate adjacent to the bottom plate, the heat sink includes a vertical portion and a horizontal portion connecting the vertical portion, and the backlight is mounted on the backlight On the vertical portion of the heat sink, the support member is disposed on a horizontal portion of the heat sink, and the second support portion supports the reflective sheet.
  • the heat sink is made of aluminum iridium.
  • the horizontal portion of the heat sink is provided with a rib, and the reflective sheet is supported on the rib.
  • the backlight module of the present invention supports the backlight simultaneously through the supporting member
  • the source and the light guide plate form a stable alignment relationship between the backlight and the light guide plate, thereby increasing the stability of the optical coupling, and the structure is simple, and the cost is low, which is advantageous for achieving thinning.
  • FIG. 1 is a schematic structural view of a conventional backlight module
  • FIG. 2 is a schematic structural view of a backlight module of a conventional thinned liquid crystal display device
  • FIG. 3 is a schematic structural view showing deformation of the light guide plate and the reflective sheet of FIG. 2;
  • FIG. 4 is a schematic structural view of a backlight module of the present invention.
  • FIG. 5 is a schematic perspective view of a backlight module of the present invention.
  • FIG. 6 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 2 , a light guide plate 4 disposed in the back plate 2 , a backlight 6 disposed in the back plate 2 , and a back plate 2 .
  • a backlight module including: a back plate 2 , a light guide plate 4 disposed in the back plate 2 , a backlight 6 disposed in the back plate 2 , and a back plate 2 .
  • Supporting the light guide plate 4 and the supporting member 8 of the backlight 6 the supporting member 8 simultaneously supporting the light guide plate 4 and the backlight 6 , thereby forming a stable alignment relationship between the light guide plate 4 and the backlight 6 , and increasing the optical coupling. stability.
  • the support member 8 is disposed in a stepped manner, and includes a first support portion 82 supporting the backlight 6 and a second support portion 84 connected to the first support portion 82 and supporting the light guide plate 4.
  • the first support portion and the second support portion 82, 84 of the support member 8 are integrally formed from a material such as silicone rubber, plastic or metal.
  • the backboard 2 includes a bottom plate 22 and a side plate 24 connected to an edge of the bottom plate 22, the bottom plate
  • An accommodating space 224 is formed between the light guide plate 4, the backlight 6 and the supporting member 8 in the accommodating space 224.
  • the backlight module further includes a heat sink 7 disposed on the bottom plate 22 of the back plate 2 and a reflective sheet 9 disposed on a side of the light guide plate 4 adjacent to the bottom plate 22, the heat sink 7 including a vertical portion 72 and a connection portion
  • the horizontal portion 74 of the vertical portion 72 is mounted on the vertical portion 72 of the heat sink 7 to enhance the heat dissipation effect.
  • the heat sink 7 is made of inexpensive aluminum sheet metal.
  • the support member 8 is disposed on the horizontal portion 74 of the heat sink 7, and the second support portion 84 supports the reflective sheet 9 to indirectly support the light guide plate 4.
  • the backlight 6 is a linear LED light source, and the light emitted by the backlight 6 is reflected directly or through the reflective sheet 7 and enters the light guide plate 4, thereby providing a uniform surface light source.
  • the horizontal portion 74 of the heat sink 7 is further provided with a plurality of ribs 742, and the reflection sheet 9 is supported on the rib 742 to position and support the light guide plate 4.
  • the supporting component 8 includes a first supporting portion 82 and a first connecting portion 82 .
  • the second supporting portion 84, the first and second supporting portions 82, 84 are fixedly connected by gluing, screwing or other means, and the first and second supporting portions 82, 84 may be made of the same material. It can also be made of different materials.
  • the first supporting portion 82 is made of a metal material to improve the thermal conductivity of the backlight module
  • the second supporting portion 84 is made of a plastic material to reduce the production cost.
  • the backlight module of the invention supports the backlight and the light guide plate simultaneously by the supporting component, so that the backlight and the light guide plate form a stable alignment relationship, thereby increasing the stability of the optical coupling, and the structure is simple, the cost is low, and the realization is favorable. Thin.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

一种背光模组包括背板（2）、设于背板（2）内的导光板（4）、设于背板（2）内的背光源（6）及设于背板（2）内且支撑导光板（4）与背光源（6）的支撑元件（8）。通过支撑元件（8）同时支撑背光源（6）与导光板（4），使得背光源（6）与导光板（4）形成稳定的对位关系，增加了光耦合的稳定性，且结构简单，成本低，有利于实现薄型化。

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 , 背光模组一般包括： 背板 100、 设置于背板 100 内的反 射片 200、 设置于反射片 200上的导光板 300及设置于背板 100内的背光 源 400, 背光源 400 以导热胶（未图示）或螺丝 （未图示） 紧密固定于散 热条 500上， 将背光源 400发出的热量透过散热条 500引出并传导至背板 100 上， 以背板 100 的底板 102 与外界的空气进行热交换散热。 散热条 500 一般为铝挤散热条， 但由于铝挤散热条成本较高， 后续渐渐以铝钣金 散热片代替铝挤散热条， 或将背光源 400 直接固定于背板 100 上直接散 热。
薄型化是现今液晶显示装置的发展趋势， 相应的导光板 300厚度就需 要减薄， 但减薄导光板 300的厚度， 会造成导光板 300的强度变差， 这就 需要一些结构来将导光板 300支撑至与背光源 400相同高度以保证入光条 件。
请参阅图 2, 为现有的一种薄型化液晶显示装置的背光模组的结构示 意图， 该背光模组包括： 背板 100，、 设置于背板 100，内的反射片 200，、 设 置于反射片 200，上的导光板 300，、 设置于背板 100，内的背光源 400，及铝钣 热片 500，， 该铝钣金散热片 500，上设置有一凸肋 502，， 用以支撑导光 板 300，， 以实现导光板 300，与背光源 400，位于同一高度。
但因凸肋 502，成形的限制造成背光源 400，耦光位置有一段距离， 并且 减薄厚度的导光板 300，由于强度不足而在入光侧形成下垂现象（如图 3所 示） ， 造成耦光的误差， 使大量的背光源发出的光线外露， 不仅耦光效率 变差， 而且易于在导光板 300，入光面附近造成亮线区域。 发明内容
本发明的目的在于提供一种背光模组， 其结构筒单， 成本低， 且有利 于薄型化。
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 内的导光板、 设于背板内的背光源及设于背板内且支撑导光板与背光源的 支撑元件。
所述支撑元件呈台阶状设置。
所述支撑元件包括支撑背光源的第一支撑部及连接第一支撑部且支撑 导光板的第二支撑部。
所述第一支撑部与第二支撑部一体成型制成。
所述第一支撑部与第二支撑部通过胶粘或螺釘锁合方式固定连接在一 起。
所述支撑元件由硅胶、 塑胶或金属材料制成； 所述背光源为线性 LED 光源。
所述背板包括底板及连接于该底板边缘的侧板， 该底板与侧板形成一 容置空间， 所述导光板、 背光源及支撑元件均容置于该容置空间内。
还包括设于背板底板上的散热片及设于导光板靠近底板一侧的反射 片， 所述散热片包括一竖直部与一连接该竖直部的水平部， 所述背光源安 装于该散热片的竖直部上， 所述支撑元件设于该散热片的水平部上， 所述 第二支撑部支撑所述反射片。
所述散热片由铝钣金制成。
所述散热片的水平部设有凸肋， 所述反射片被支撑于该凸肋上。
本发明的有益效果： 本发明的背光模组， 通过支撑元件同时支撑背光 源与导光板， 使得背光源与导光板形成稳定的对位关系， 增加了光耦合的 稳定性， 且结构筒单， 成本低， 有利于实现薄型化。
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为现有背光模组的结构示意图；
图 2为现有的一种薄型化液晶显示装置的背光模组的结构示意图； 图 3为图 2中导光板与反射片变形的结构示意图；
图 4为本发明背光模组的结构示意图；
图 5为本发明背光模组的立体结构示意图；
图 6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 4及图 5 , 本发明提供一种背光模组， 包括： 背板 2、 设于 背板 2内的导光板 4、 设于背板内 2的背光源 6及设于背板 2内且支撑导 光板 4与背光源 6的支撑元件 8, 该支撑元件 8同时支撑导光板 4与背光 源 6, 进而使得导光板 4与背光源 6形成稳定的对位关系， 增加了光耦合 的稳定性。
所述支撑元件 8呈台阶状设置， 其包括支撑背光源 6的第一支撑部 82 及连接于该第一支撑部 82且支撑导光板 4的第二支撑部 84。
优选的， 所述支撑元件 8 的第一支撑部和第二支撑部 82、 84 由硅 胶、 塑胶或金属等材料一体成型制成。
所述背板 2 包括底板 22及连接于该底板 22边缘的侧板 24, 该底板
22与侧板 24形成一容置空间 224, 所述导光板 4、 背光源 6及支撑元件 8 均容置于该容置空间 224内。
所述背光模组还包括设于背板 2底板 22上的散热片 7及设于导光板 4 靠近底板 22—侧的反射片 9, 所述散热片 7包括一竖直部 72与一连接该 竖直部 72的水平部 74, 所述背光源 6安装于该散热片 7的竖直部 72上， 以增强散热效果， 在本实施例中， 所述散热片 7 由价格便宜的铝钣金制 成， 进而降低生产成本； 所述支撑元件 8 设于该散热片 7 的水平部 74 上， 所述第二支撑部 84支撑所述反射片 9, 进而间接支撑导光板 4。
所述背光源 6 为线性 LED 光源， 其发出的光线直接或经由反射片 7 反射后进入导光板 4中， 进而提供均匀的面光源。
值得一提的是， 所述散热片 7的水平部 74上还设有数个凸肋 742, 所 述反射片 9支撑于该凸肋 742上， 对导光板 4进行定位支撑。
请参阅图 6, 为本发明背光模组的另一实施例的结构示意图， 在本实 施例中， 所述支撑元件 8，包括第一支撑部 82，与连接于第一支撑部 82，的第 二支撑部 84，， 该第一与第二支撑部 82，、 84，通过胶粘、 螺釘锁合或其它 方式固定连接在一起， 该第一、 第二支撑部 82，、 84，可由相同材料制成， 也可由不同材料制成， 优选的， 第一支撑部 82，由金属材料制成， 提高背 光模组的导热性， 第二支撑部 84，由塑胶材料制成， 降低生产成本。
本发明的背光模组， 通过支撑元件同时支撑背光源与导光板， 使得背 光源与导光板形成稳定的对位关系， 增加了光耦合的稳定性， 且结构筒 单， 成本低， 有利于实现薄型化。
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
I、 一种背光模组， 包括： 背板、 设于背板内的导光板、 设于背板内 的背光源及设于背板内且支撑导光板与背光源的支撑元件。
2、 如权利要求 1 所述的背光模组， 其中， 所述支撑元件呈台阶状设 置。
3、 如权利要求 2 所述的背光模组， 其中， 所述支撑元件包括支撑背 光源的第一支撑部及连接第一支撑部且支撑导光板的第二支撑部。
4、 如权利要求 3 所述的背光模组， 其中， 所述第一支撑部与第二支 撑部一体成型制成。
5、 如权利要求 3 所述的背光模组， 其中， 所述第一支撑部与第二支 撑部通过胶粘或螺釘锁合方式固定连接在一起。
6、 如权利要求 1 所述的背光模组， 其中， 所述支撑元件由硅胶、 塑 胶或金属材料制成； 所述背光源为线性 LED光源。
7、 如权利要求 1 所述的背光模组， 其中， 所述背板包括底板及连接 于该底板边缘的侧板， 该底板与侧板形成一容置空间， 所述导光板、 背光 源及支撑元件均容置于该容置空间内。
8、 如权利要求 7 所述的背光模组， 还包括设于背板底板上的散热片 及设于导光板靠近底板一侧的反射片， 所述散热片包括一竖直部与一连接 该竖直部的水平部， 所述背光源安装于该散热片的竖直部上， 所述支撑元 件设于该散热片的水平部上， 所述第二支撑部支撑所述反射片。
9、 如权利要求 8 所述的背光模组， 其中， 所述散热片由铝钣金制 成。
10、 如权利要求 8所述的背光模组， 其中， 所述散热片的水平部设有 凸肋， 所述反射片被支撑于该凸肋上。
II、 一种背光模组， 包括： 背板、 设于背板内的导光板、 设于背板内 的背光源及设于背板内且支撑导光板与背光源的支撑元件；
其中， 所述支撑元件呈台阶状设置；
其中， 所述支撑元件包括支撑背光源的第一支撑部及连接第一支撑部 且支撑导光板的第二支撑部；
其中， 所述第一支撑部与第二支撑部一体成型制成；
其中， 所述支撑元件由硅胶、 塑胶或金属材料制成； 所述背光源为线 性 LED光源； 其中， 所述背板包括底板及连接于该底板边缘的侧板， 该底板与侧板 形成一容置空间， 所述导光板、 背光源及支撑元件均容置于该容置空间 内；
其中， 所述背光模组还包括设于背板底板上的散热片及设于导光板靠 近底板一侧的反射片， 所述散热片包括一竖直部与一连接该竖直部的水平 部， 所述背光源安装于该散热片的竖直部上， 所述支撑元件设于该散热片 的水平部上， 所述第二支撑部支撑所述反射片；
其中， 所述散热片由铝钣金制成；
其中， 所述散热片的水平部设有凸肋， 所述反射片被支撑于该凸肋 上。
PCT/CN2012/075697 2012-05-09 2012-05-18 背光模组 WO2013166747A1 (zh)

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