WO2015089922A1 - 一种背光模组及其散热装置 - Google Patents

一种背光模组及其散热装置 Download PDF

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Publication number
WO2015089922A1
WO2015089922A1 PCT/CN2014/070223 CN2014070223W WO2015089922A1 WO 2015089922 A1 WO2015089922 A1 WO 2015089922A1 CN 2014070223 W CN2014070223 W CN 2014070223W WO 2015089922 A1 WO2015089922 A1 WO 2015089922A1
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WO
WIPO (PCT)
Prior art keywords
heat dissipation
guide plate
light guide
dissipation member
dissipation device
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Application number
PCT/CN2014/070223
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English (en)
French (fr)
Inventor
吕城龄
张庞岭
唐国富
Original Assignee
深圳市华星光电技术有限公司
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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 US14/232,902 priority Critical patent/US9377577B2/en
Publication of WO2015089922A1 publication Critical patent/WO2015089922A1/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
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package

Definitions

  • the invention designs the field of display technology, in particular, the structural improvement of the heat sink of the backlight module.
  • the power density of the backlight module is the power density of the backlight module
  • Power Density is getting bigger and bigger, causing the backlight module to generate more heat, so the heat dissipation of the high Power Density backlight module becomes an urgent problem to be solved.
  • Power Density is related to the spacing between the light bar power and the LEDs. The use of high-power light strips and small LED spacing can result in high Power Density.
  • the existing backlight module relies on heat-dissipating components to conduct heat from the light source to the back frame, reducing the heat concentration of the light source to the light guide plate. Radiation.
  • a significant temperature gradient is typically present on the heat dissipating component.
  • the present invention provides a heat dissipating device for a backlight module, which can speed up the heat dissipation of the backlight module through a flexible combination of main and auxiliary heat dissipating members.
  • the heat dissipating device is disposed between the back frame of the backlight module and the light guide plate, and is configured to dissipate the light source corresponding to the side surface of the light guide plate, wherein the heat dissipating device comprises a main heat dissipating member and an auxiliary heat dissipating member that overlap each other;
  • the side of the main heat sink extends upwardly with a side wall for connecting with the light source;
  • the auxiliary heat sink is disposed between the bottom of the light guide plate, the side wall of the main heat sink and the middle thereof.
  • the distance between the auxiliary heat sink and the side wall of the main heat sink is 10 to 15 mm.
  • auxiliary heat sink is bonded, spliced or nut-connected to the main heat sink.
  • a heat conducting layer is disposed between the auxiliary heat sink and the main heat sink. Further, the surface of the auxiliary heat dissipating member is coated with a heat insulating layer for transmitting a heat insulating amount to the light guiding device, wherein the heat conducting layer is made of graphene; and the heat insulating layer is made of plastic or rubber. Further, a gap is further provided between the auxiliary heat sink and the light guide plate.
  • a non-thermal conductive support member is disposed between the side wall of the main heat dissipating member and the middle portion thereof to form a support for the light guide plate, so that the gap is kept stable.
  • auxiliary heat sink is provided with an air flow passage.
  • the air flow passage has a hollow rectangular shape or a hollow arc shape, and is closed around, and the two ends are connected to the atmosphere.
  • the main heat sink and/or the auxiliary heat sink are made of one of aluminum sheet metal or aluminum.
  • the present invention also provides a backlight module, including a back frame, and a light source, a heat sink, and a light guide plate mounted on the inner side of the back frame, wherein the light source corresponds to a side of the light guide plate; Between the back frame and the light guide plate, for dissipating heat from the light source, the heat sink is a heat sink as described above. Beneficial effects:
  • the invention adopts a main heat sink auxiliary heat sink which is overlapped with each other to form a new heat sink device, which effectively improves the heat dissipation efficiency of the backlight module under high Power Density, prolongs the service life of the light source and improves the optical taste.
  • the auxiliary heat sink can be changed in various configurations, such as the air flow channel structure, or the bottom surface and the top surface of the auxiliary heat sink respectively cover the high heat conductive material and the heat insulating material, or introduce a gap between the auxiliary heat sink and the light guide plate. On the one hand, it promotes the heat transfer between the main and auxiliary components, on the other hand, it suppresses the heat transfer to the light guide plate, and further improves its optical grade.
  • the main heat sink and the auxiliary heat sink are connected in various ways, the structure is simple, the assembly is convenient, the material utilization rate is high, and the economic benefit is obvious.
  • FIG. 1 is a partial structural diagram of a backlight module according to Embodiment 1 of the present invention.
  • 2 is a schematic partial structural view of another backlight module according to Embodiment 1 of the present invention.
  • 3 is a schematic partial structural view of a backlight module according to Embodiment 2 of the present invention.
  • 4 is a schematic partial structural view of a backlight module according to Embodiment 3 of the present invention.
  • FIG. 5 is a partial schematic structural view of a backlight module according to Embodiment 4 of the present invention.
  • Embodiment 1 This embodiment provides a backlight module. As shown in FIG. 1, the backlight module includes a back frame 20 and a light source 10, a light guide plate 30, and a heat sink mounted on the inner side of the back frame 20. The light source 10 corresponds to the side of the light guide plate 30. The heat sink 40 is disposed between the back frame 20 and the light guide plate 30 for dissipating heat from the light source 10. Specifically, the heat sink 40 includes a main heat sink 41 and an auxiliary heat sink 42 that overlap each other.
  • the central portion 41b of the main heat sink 41 is upwardly extended to support the central portion of the light guide plate 30, so that the end portion of the main heat sink 41 extends upwardly.
  • the end of the light plate 30 (the portion close to the light source 10) is suspended. This structure prevents the main heat sink 41 from receiving a portion where the heat conduction of the light source 10 is more in contact with the light guide plate 30, so that the temperature of the light guide plate 30 rises.
  • the auxiliary heat sink 42 is disposed between the bottom of the light guide plate 30, the side wall 41a of the main heat sink 41 and the middle portion 41b thereof to accelerate the heat loss of the portion.
  • the auxiliary heat sink 42 forms a support for the end portion of the light guide plate 30, and also functions to keep the shape of the light guide plate 30 stable.
  • the auxiliary heat sink 42 cannot be too close to the side wall of the main heat sink 41 and the light source 10 on the side wall; nor can it be too far away, so as not to dissipate heat and support the light guide plate 30.
  • the distance D between the auxiliary heat sink 42 and the side wall 41a of the main heat sink 41 is preferably between 10 and 15 mm.
  • the main heat dissipating member 41 and the auxiliary heat dissipating member 42 are both made of a high thermal conductivity material, which facilitates rapid heat transfer.
  • the main heat dissipating member 41 can be made of aluminum sheet metal 1050
  • the auxiliary heat dissipating member 41 can be made of aluminum sheet metal 5052 or Aluminum extruded 6063 and so on.
  • the main heat dissipating member 41 and the auxiliary heat dissipating member 42 may be connected by any means of bonding, splicing or nut, and the shape of the auxiliary heat dissipating member 42 is not particularly required, as long as it is easy to assemble and achieve the purpose of accelerating heat dissipation.
  • FIG. 2 shows the structure of the heat sink 40A formed by the auxiliary heat sink 42A and the main heat sink 41 being connected by a nut.
  • the structure of the backlight module provided in this embodiment is similar to that of the first embodiment. The difference is that in the heat dissipation device 40B of the embodiment, as shown in FIG. 3, the auxiliary heat dissipation member 42B is disposed between the auxiliary heat dissipation member 42B and the main heat dissipation member 41.
  • the heat conducting layer 43 is configured to reduce the thermal resistance and accelerate the heat of the main heat dissipating member 41 to the auxiliary heat dissipating member 42B.
  • the heat conductive layer 43 may be filled with a high heat conductive material, such as a novel heat conductive material graphene, which has a thermal conductivity of 5600 w/mk; and the heat insulating layer 44 is made of a heat insulating material such as plastic or rubber.
  • a high heat conductive material such as a novel heat conductive material graphene, which has a thermal conductivity of 5600 w/mk
  • the heat insulating layer 44 is made of a heat insulating material such as plastic or rubber.
  • an air flow channel 45 is defined in the auxiliary heat sink 42C.
  • the air flow channel 45 has a hollow rectangular shape or a hollow arc shape, or other hollow geometry that can be implemented; and the air flow channel 45 is closed around the air passage through the two ends.
  • This design allows the auxiliary heat sink 42C to absorb heat from the main heat sink 41 while dissipating the absorbed heat to the ambient atmosphere through the air flow passage 45, preventing the heat from continuing to be transmitted upward to the light guide plate 30.
  • such a structure is not limited to the embodiment, and can be applied to other embodiments without conflicting structures.
  • the structure of the backlight module provided in this embodiment is similar to that of the first embodiment. The difference is that in the heat dissipation device 40D of the embodiment, as shown in FIG.
  • a gap is reserved between the auxiliary heat dissipation member 42D and the light guide plate 30. 46, the auxiliary heat sink 42D is not in direct contact with the light guide plate 30, and the heat radiation of the auxiliary heat sink 42D to the light guide plate 30 is further reduced.
  • both ends of the light guide plate 30 are suspended above the main heat sink 41, so that the light guide plate 30 may be deformed downwardly at both ends after being used for a period of time.
  • the gap 46 is gradually reduced, and the light source 10 cannot be accurately aligned with the side of the light guide plate 30, which directly affects the performance of the backlight module. Therefore, a non-thermal support is provided between the side wall 41a of the main heat sink 41 and the middle portion 41b thereof.
  • the member 47 forms a support for the light guide plate 30, and the shape of the light guide plate 30 is stably maintained by the support member 47, and the gap 46 before the auxiliary heat sink 42D and the light guide plate 30 is stabilized, thereby effectively preventing heat from being transmitted upward to the light guide plate 30, thereby ensuring
  • the light guide plate 30 has a good grade.
  • the material of the support member 47 may be selected from a material having poor thermal conductivity, such as rubber.
  • such a structure is not limited to the embodiment, and can be applied to other embodiments without conflicting structures.
  • Those skilled in the art can know that, in the case that the various embodiments do not conflict, they can be used in combination with each other, which can improve the heat dissipation efficiency of the heat sink to the light source, thereby prolonging the life of the light source, improving the quality and performance of the backlight module, and further improving.
  • the purpose of optical grade can be used in combination with each other, which can improve the heat dissipation efficiency of the heat sink to the light source, thereby prolonging the life of the light source, improving the quality and performance of the backlight module, and further improving.
  • the purpose of optical grade is not limited to the embodiment, and can be applied to other embodiments without conflicting structures.

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  • 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

一种背光模组的散热装置（40）以及采用这种散热装置（40）的背光模组结构，背光模组的散热装置（40），设置于背框（20）和导光板（30）之间，用于对光源（10）进行散热，散热装置（40）包括相互搭接的主散热件（41）和辅散热件（42），主散热件（41）端部向上延伸一侧壁（41a）用于与光源（10）连接，辅散热件（42）设置于主散热件（41）和导光板（30）之间。采用了相互搭接的主散热件（41）辅散热件（42）构成新的散热装置（40），有效提高了高效率密度下背光模组的散热效率，延长了光源（10）的使用寿命，提高光学品位。

Description

一种背光模组及其散热装置
技术领域
本发明设计显示器技术领域， 尤其是指对背光模组的散热装置的结构改进。
说
背景技术
目前， 为了提高液晶显示器的亮度和穿透率等品味， 背光模组的功率密度
书
(Power Density) 越来越大， 导致背光模组将产生更多的热量， 因此高 Power Density背光模组的散热成为亟待解决的问题。 Power Density与灯条功率和 LED 等之间的间距有关。 使用高的功率灯条和较小的 LED间距都有可能造成高的 Power Density 一方面，现有的背光模组中依靠散热元件将光源的热量传导至背 框上， 减少光源热量集中对导光板的辐射。 另一方面， 散热元件上一般呈现明 显的温度梯度。 越靠近光源的散热元件部分， 吸收的热量越多， 温度越高； 随 着离光源越来越远， 散热元件的温度逐渐降低。 但是， 这种传统的、 单一的散 热元件， 已经不能满足较大 Power Density背光模组的散热要求，若单纯通过增加 散热元件的宽幅和厚度， 对加工成型要求高， 且材料利用率低， 经济效益不明 显。 因此， 有必要对现有散热元件进行改进。 发明内容
为了解决上述问题， 本发明提供一种背光模组的散热装置， 通过灵活组合 的主、 辅散热件达到加快背光模组散热的效率。
这种散热装置， 其设置于背光模组的背框和导光板之间， 用于对导光板侧 面所对应的光源进行散热， 所述散热装置包括相互搭接的主散热件和辅散热件； 所述主散热件端部向上延伸一侧壁用于与所述光源连接； 所述辅散热件设 置于所述导光板底部、 所述主散热件的侧壁及其中部之间。
进一歩地， 所述辅散热件与所述主散热件侧壁的距离 10〜15mm。
进一歩地， 所述辅散热件与所述主散热件粘接、 悍接或螺母连接。
进一歩地， 所述辅散热件与所述主散热件之间设有导热层。 进一歩地， 所述辅散热件表面包覆绝热层， 用于阻隔热量传递至所述导光 进一歩地， 所述导热层的材质为石墨烯； 所述绝热层的材质为塑料或橡胶。 进一歩地， 所述辅散热件与所述导光板之间还设有间隙。
进一歩地， 所述主散热件侧壁及其中部之间设有一非导热支撑件对所述导 光板形成支撑， 使得所述间隙保持稳定。
进一歩地， 所述辅散热件设有气流通道。
进一歩地， 所述气流通道呈现空心矩形或空心弓形， 四周封闭， 两端与大 气贯通。
进一歩地， 所述主散热件和 /或辅散热件的材质为铝钣金或铝挤中的一种。 本发明还提供一种背光模组， 包括背框， 以及安装于所述背框内侧的光源、 散热装置和导光板， 所述光源与所述导光板侧面对应； 所述散热装置设置于所 述背框和所述导光板之间， 用于对光源进行散热， 该散热装置为如上所述的散 热装置。 有益效果：
1、 本发明采用了相互搭接的主散热件辅散热件构成新的散热装置， 有效提 高了高 Power Density下背光模组的散热效率， 延长了光源的使用寿命， 提高光 学品味。
2、 辅散热件可以采用多种构型变化， 如气流通槽结构， 或辅散热件底面和 顶面分别覆盖高导热材料和绝热材料， 或在辅散热件与导光板之间引入间隙。 一方面促进主、 辅元件之间的热传递， 另一方面抑制热量向上传递至导光板， 进一歩提高其光学品位。
3、 主散热件和辅散热件的连接方式多样， 结构简单， 组装方便， 材料利用 率高， 具有明显的经济效益。 附图说明
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述中所 需要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明 的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图， 其中： 图 1为本发明实施例 1的背光模组局部结构示意图。 图 2为本发明实施例 1的另一背光模组局部结构示意图。 图 3为本发明实施例 2的背光模组局部结构示意图。 图 4为本发明实施例 3的背光模组局部结构示意图。 图 5为本发明实施例 4的背光模组局部结构示意图。 具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅是本发明的一部分实施例， 而不是 全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。 实施例 1 本实施例提供一种背光模组， 如图 1所示， 这种背光模组包括背框 20以及 安装于所述背框 20内侧的光源 10、导光板 30和散热装置。所述光源 10与所述 导光板 30侧面对应； 所述散热装置 40则设置于所述背框 20和所述导光板 30 之间， 用于对光源 10进行散热。 具体地， 所述散热装置 40包括相互搭接的主 散热件 41和辅散热件 42。
其中， 所述主散热件 41端部向上延伸一侧壁 41a与所述光源 10背侧连接； 所述主散热件 41的中部 41b向上凸出用于支撑所述导光板 30中部位置， 使导 光板 30端部 （接近光源 10的部分） 悬空。 这种结构避免主散热件 41接受光源 10热传导较多的部分接触到导光板 30， 使导光板 30温度升高。
同时， 将所述辅散热件 42设置于所述导光板 30底部、 所述主散热件 41的 侧壁 41a及其中部 41b之间， 加快这部分的热量散失。 在本实施例中， 辅散热 件 42对导光板 30的端部形成支撑， 也起到保持导光板 30形状稳定的作用。
其中， 所述辅散热件 42不能太过于接近所述主散热件 41侧壁及该侧壁上 的光源 10; 也不能距离太远， 这样也起到不散热及支撑导光板 30的作用。 为了 协调散热和支撑效果， 所述辅散热件 42与所述主散热件 41侧壁 41a的距离 D 优选 10〜15mm之间。
其中， 所述主散热件 41和辅散热件 42均选用高导热性材质， 有利于热量 快速传递， 如主散热件 41可选用铝钣金 1050， 辅散热件 41的材质可用铝钣金 5052或铝挤 6063等。 进一歩地， 所述主散热件 41和辅散热件 42可通过粘接、 悍接或螺母任一 种方式连接， 并且辅散热件 42的形状没有特殊要求， 只要便于组装及达到加快 散热的目的均可以， 因此所形成的散热结构 40也是多变的。 例如， 图 2展示了 辅散热件 42A与主散热件 41通过螺母连接所形成的散热装置 40A结构。 实施例 2 本实施例所提供的背光模组结构与实施例 1相似， 不同的是本实施例的散 热装置 40B中， 如图 3所示， 辅散热件 42B与主散热件 41之间设有导热层 43， 用于降低热阻， 加快主散热件 41的热量向辅散热件 42B扩散； 进一歩地， 所述 辅散热件 42B表面包覆绝热层 44， 用于阻隔热量传递至所述导光板 30。 其中， 导热层 43可采用高导热材质填充， 如新型导热材料石墨烯， 其导热系数达到 5600w/mk; 绝热层 44的材质则选用绝热材质， 如塑料或橡胶。 本领域技术人员可知， 这种结构并不限于本实施例， 在结构不冲突的情况 下也可以应用到其他实施例中。 实施例 3 本实施例所提供的背光模组结构与实施例 1相似， 不同的是本实施例的散 热装置 40C中， 如图 4所示， 在辅散热件 42C内部开设有气流通道 45。 其中， 该气流通道 45呈现空心矩形或空心弓形， 或其他可实施的空心几何形状； 且气 流通道 45四周封闭， 通过两端与大气贯通。这种设计使得辅散热件 42C—边从 主散热件 41吸收热量， 一边将吸收的热量通过气流通道 45往环境大气散失， 阻止热量继续向上传递至导光板 30。 类似地， 这种结构并不限于本实施例， 在 结构不冲突的情况下也可以应用到其他实施例中。 实施例 4 本实施例所提供的背光模组结构与实施例 1相似， 不同的是本实施例的散 热装置 40D中， 如图 5所示， 辅散热件 42D与导光板 30之间保留一间隙 46， 使得辅散热件 42D与导光板 30不直接接触， 进一歩减少辅散热件 42D对导光 板 30的热辐射。
进一歩地， 由于间隙 46的存在使得导光板 30两端部在主散热件 41上方悬 空， 这样导光板 30在使用一段时间后会出现两端部往下塌陷变形。 间隙 46逐 渐减少， 导致光源 10不能准确对准导光板 30的侧面， 直接影响背光模组的使 用性能。 因此， 所述主散热件 41侧壁 41a及其中部 41b之间设有一非导热支撑 件 47对所述导光板 30形成支撑， 利用支撑件 47稳定保持导光板 30的形状、 以及辅散热件 42D与导光板 30之前的间隙 46稳定， 有效阻止热量向上传递至 导光板 30， 保证了导光板 30具有良好的品位。 其中， 支撑件 47的材质可选用 导热性差的材料， 如橡胶。
类似地， 这种结构并不限于本实施例， 在结构不冲突的情况下也可以应用 到其他实施例中。 本领域技术人员可知， 在各种实施方式不冲突的情况下， 可以相互组合使 用， 均可以提高散热装置对光源的散热效率， 达到延长光源寿命、 提高背光模 组的质量和性能， 进一歩提高光学品位的目的。

Claims

权 利 要 求 书
1、 一种背光模组的散热装置， 其设置于背光模组的背框和导光板之间， 用于对所述导光板侧面所对应的光源进行散热， 其中， 所述散热装置包括相互 搭接的主散热件和辅散热件；
所述主散热件端部向上延伸一侧壁用于与所述光源连接； 所述辅散热件设 置于主散热件和导光板之间。
2、 根据权利要求 1所述的散热装置， 其中， 所述辅散热件与所述主散热 件侧壁的距离为 10〜15mm。
3、 根据权利要求 2所述的散热装置， 其中， 所述辅散热件与所述主散热 件粘接、 悍接或螺母连接。
4、 根据权利要求 1所述的散热装置， 其中， 所述辅散热件与所述主散热 件之间设有导热层。
5、 根据权利要求 4所述的散热装置， 其中， 所述辅散热件表面包覆绝热 层， 用于阻隔热量传递至所述导光板。
6、 根据权利要求 5所述的散热装置，其中，所述导热层的材质为石墨烯; 所述绝热层的材质为塑料或橡胶。
7、 根据权利要求 1所述的散热装置， 其中， 所述辅散热件与所述导光板 之间还设有间隙。
8、 根据权利要求 7所述的散热装置， 其中， 所述主散热件侧壁及其中部 之间设有一非导热支撑件对所述导光板形成支撑， 使得所述间隙保持稳定。
9、 根据权利要求 1所述的散热装置， 其特征在于， 所述辅散热件设有气 流通道。
10、 根据权利要求 9所述的散热装置， 其中， 所述气流通道呈现空心矩形 或空心弓形， 四周封闭， 两端与大气贯通。
11、 根据权利要求 1所述的散热装置， 其中， 所述主散热件和 /或辅散热件 的材质为铝钣金或铝挤的中的一种。
12、 一种背光模组的散热装置， 其设置于背光模组的背框和导光板之间， 用于对所述导光板侧面所对应的光源进行散热， 其中， 所述散热装置包括相互 搭接的主散热件和辅散热件；
所述主散热件端部向上延伸一侧壁用于与所述光源连接； 所述辅散热件设 置于主散热件和导光板；所述辅散热件与所述主散热件侧壁的距离为 10〜15mm。
13、 一种背光模组， 包括背框， 以及安装于所述背框内侧的光源、 散热装 置和导光板， 所述光源与所述导光板侧面对应； 所述散热装置设置于所述背框 和所述导光板之间， 用于对所述导光板侧面所对应的光源进行散热， 其中， 所 述散热装置包括相互搭接的主散热件和辅散热件；
所述主散热件端部向上延伸一侧壁用于与所述光源连接； 所述辅散热件设 置于主散热件和导光板之间。
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