WO2014032325A1 - 一种背光模组及采用该背光模组的液晶显示装置 - Google Patents

一种背光模组及采用该背光模组的液晶显示装置 Download PDF

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Publication number
WO2014032325A1
WO2014032325A1 PCT/CN2012/081080 CN2012081080W WO2014032325A1 WO 2014032325 A1 WO2014032325 A1 WO 2014032325A1 CN 2012081080 W CN2012081080 W CN 2012081080W WO 2014032325 A1 WO2014032325 A1 WO 2014032325A1
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Prior art keywords
backlight module
liquid crystal
crystal display
display device
heat conduction
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PCT/CN2012/081080
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English (en)
French (fr)
Inventor
黄冲
吴泽鑫
萧宇均
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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 US13/643,087 priority Critical patent/US8858035B2/en
Priority to DE112012006359.7T priority patent/DE112012006359T5/de
Publication of WO2014032325A1 publication Critical patent/WO2014032325A1/zh

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    • 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
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia

Definitions

  • the present invention relates to the field of liquid crystal display, and in particular to a backlight module and a liquid crystal display device using the same. Background technique
  • the liquid crystal display device includes a display module.
  • the display module needs to use a backlight to provide a light source.
  • the existing backlights are mainly CCFLs and LEDs.
  • LED is a new type of light source, which has the advantages of high brightness and low power consumption. Therefore, the design of LED backlight is gradually increasing, and it is also a trend for future design. However, since LED also generates high heat at the same time, in order to ensure LED light-emitting efficiency and life. , need to design the heat dissipation for the LED.
  • the existing heat dissipation methods mainly include heat dissipation of the back plate and aluminum extrusion (aluminum extruded heat dissipation profile).
  • the heat dissipation method of the back plate requires the entire back plate to be made of aluminum or aluminum alloy, which has high cost and does not meet the low cost. Design requirements, so it is not often used;
  • aluminum extrusion heat dissipation means LED7 is packaged on MCPCB (Metal Core PCB, metal-based printed circuit board) to form LED light bar, and then LED light bar is passed through thermal adhesive The adhesive is fixed on the aluminum extrusion 8, and the aluminum extrusion 8 is placed on the back plate 9.
  • the backlight module of this structure has the following drawbacks:
  • the technical problem to be solved by the present invention is to provide a backlight module and a liquid crystal display device using the same, which can form an air circulation channel inside the heat conduction cavity to improve the heat dissipation effect; the light source and the MCPCB can be eliminated from being packaged. Forming a light bar and adhering the light bar to the aluminum extrusion process, reducing Thermal resistance interface saves assembly materials.
  • an embodiment of the present invention provides a backlight module including a light source and aluminum extrusion, the light source being fixed on the aluminum extrusion, the aluminum extrusion including at least one heat conduction cavity, the heat conduction cavity It is a hollow through structure with an opening.
  • the light source is fixed on an outer wall of the heat conduction cavity.
  • the aluminum extrusion further comprises: an extension plate for increasing the contact area with the outside air, the extension plate extending from any one of the wall surfaces of the heat conduction cavity.
  • the two side ends of the extension plate are respectively flush with the opposite open ends of the heat conduction cavity.
  • the surface of the extension plate is sprayed with a heat-dissipating paint or a heat-dissipating heat-dissipating layer.
  • the extension plate comprises a horizontal plate and a vertical plate disposed perpendicular to each other, and the horizontal plate or the vertical plate is spliced integrally with the back plate of the backlight module.
  • the heat conducting cavity has a square cross section.
  • the outer surface of the heat conducting cavity is sprayed with a heat dissipating paint or a heat dissipating heat radiating layer.
  • the invention also discloses a liquid crystal display device having the above backlight module structure.
  • the backlight module comprises a light source and aluminum extrusion
  • the aluminum extrusion comprises at least one heat conduction cavity
  • the heat conduction cavity is a hollow through structure with an opening
  • the light source LED is directly packaged
  • the backlight module can form a channel for air circulation inside the heat-conducting cavity to improve the heat-dissipating effect
  • the light source and the MCPCB can be eliminated from being packaged to form a light bar and the light bar is adhered to the aluminum extrusion process. Reduce the thermal resistance interface and save assembly materials.
  • FIG. 1 is a partial cross-sectional structural view showing a first embodiment of a backlight module of the present invention
  • FIG. 2 is a partial cross-sectional structural view showing a second embodiment of the backlight module of the present invention
  • FIG. 3 is a partial cross-sectional structural view of a backlight module in the prior art. detailed description
  • the embodiment of the invention provides a backlight module, comprising: a light source 1 and an aluminum extrusion 2, the light source 1 is fixed on the aluminum extrusion 2, the aluminum extrusion 2 comprises at least one heat conduction cavity 21, and the heat conduction cavity 21 is a hollow through structure having an opening .
  • the backlight module of the present invention forms a passage for air circulation inside the heat conduction chamber 21 by providing the heat conduction chamber 21, thereby increasing the fluidity of the air, so that the heat on the aluminum extrusion 1 can be quickly transmitted to the outside by the heat conduction chamber 21;
  • the hollow structure of the heat conduction cavity 21 also has the effect of increasing the contact area between the aluminum extrusion 1 and the air, which is advantageous for the backlight module to dissipate heat more efficiently.
  • the structure of the backlight module will be described below.
  • the backlight module has a light source 1 and an aluminum extrusion 2, and the light source 1 is fixed on the aluminum extrusion 2.
  • the aluminum extrusion 2 consists of a heat transfer chamber 21 and an extension plate 22.
  • the heat conducting cavity 21 is formed by four side walls which are connected end to end, and has a square cross section. Openings are formed at opposite ends of the heat transfer chamber 21, and a hollow cylindrical air flow passage is formed therein, and the light source 1 is directly packaged on the outer wall of any one of the side walls of the heat transfer chamber 21.
  • the heat generated by the light source LED is conducted from the sidewall of the heat conduction cavity 21 into the heat conduction cavity 21. Since the opposite ends of the heat conduction cavity 21 are provided with openings, the air inside the heat conduction cavity 21 is heated due to the density. Goes low and directional flow occurs. At this time, a passage for air circulation is formed inside the heat conduction chamber 21 to accelerate the dissipation of heat therein; in this process, the four side walls of the heat conduction chamber 21 also participate in heat conduction simultaneously, increasing the entire aluminum extrusion and external air. The contact area enables efficient heat dissipation.
  • the aluminum extrusion process saves the assembly material; the light source LED is directly packaged on the outer wall of the heat-conducting cavity 21, and the thermal resistance is also reduced. Interface, to achieve the purpose of auxiliary heat dissipation.
  • a heat-dissipating paint or a heat-dissipating heat-dissipating layer may be sprayed on the outer surface of the heat-conducting cavity 21 to accelerate heat dissipation and achieve better heat dissipation.
  • the heat conducting cavity 21 is disposed in a square shape in cross section.
  • the surface area of the square aluminum extruded is larger than the surface area of the aluminum extruded by other cross-sectional shapes, and the heat dissipation area of the aluminum extrusion can be increased. And can guarantee the strength of aluminum extrusion.
  • the heat transfer cavity 21 can also be set to a cross section of other shapes, such as a circular shape, a common polygon, etc., to achieve the above-described more efficient heat dissipation effect.
  • the extension plate 22 extends from any one of the four side walls of the heat transfer chamber 21 for increasing the contact area of the aluminum extrusion with the outside air and accelerating the loss of heat in the heat transfer chamber 21.
  • the two side ends of the extension plate 22 may be kept flush with the opposite open ends of the heat conduction cavity 21, respectively, or all (or part of) the surface of the extension plate 22 Spray a heat-dissipating paint or a heat-dissipating heat-dissipating layer (not shown).
  • Example 2 Referring to FIG. 2, this embodiment is an embodiment in which an aluminum provided with a heat conducting cavity 21 is squeezed onto a direct type backlight module.
  • the extension plate 22 includes mutually arranged Vertical horizontal plates and risers, the light source LEDs are disposed on the outer wall of the heat transfer chamber 21 in the same plane as the horizontal plates as shown.
  • the horizontal plate provided in the embodiment can also be used as a connecting member connected to the back plate of the backlight module, and the splicing of the horizontal plate and the back plate of the backlight module can achieve low cost. Design requirements.
  • the heat transfer cavity can be set to multiple according to actual design requirements, and the heat transfer cavity can also be provided with one or more open ends according to actual heat dissipation requirements, as long as the heat conduction cavity meets the opening.
  • the hollow through structure can be.
  • the present invention also provides a liquid crystal display device comprising the backlight module of one or more of the above-described embodiments, and details are not described herein again.
  • the backlight module includes a light source and aluminum extrusion
  • the aluminum extrusion includes at least one heat conduction cavity
  • the heat conduction cavity is a hollow through structure having an opening.
  • the light source LED is directly encapsulated on the outer wall of the heat conduction cavity, and the backlight module can form a channel for air circulation inside the heat conduction cavity to improve the heat dissipation effect;
  • the light source and the MCPCB can be omitted to form a light bar and the light bar is adhered to the aluminum extrusion
  • the upper process reduces the thermal resistance interface and saves assembly materials.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

一种背光模组，包括光源（1）和铝挤（2），光源（1）固定在铝挤（2）上，铝挤（2）包括至少一个导热腔（21），导热腔（21）是具有开口的中空的贯通结构。一种具有该背光模组结构的液晶显示装置。该背光模组及采用该背光模组的液晶显示装置，可在导热腔的内部形成空气流通的通道，提升散热效果；还可以减少工序，减小热阻界面，节省装配材料。

Description

一种背光模组及采用该背光模组的液晶显示装置 本申请要求于 2012年 8月 31 日提交中国专利局、申请号为 201210317933.4
、 发明名称为 "一种背光模组及采用该背光模组的液晶显示装置" 的中国专利 申请的优先权， 上述专利的全部内容通过引用结合在本申请中。 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及采用该背光模组的液 晶显示装置。 背景技术
液晶显示装置包括显示模组， 显示模组为了显示图像， 都需要用到背光来 提供光源， 现有的背光源主要为 CCFL和 LED。 目前 LED作为较新型的光源， 具有高亮度低功耗的优点， 故采用 LED背光的设计逐渐增多， 亦为未来设计发 展趋势； 但由于 LED同时会产生高热量， 因此为保证 LED出光效率和寿命， 需 针对 LED进行散热设计。
现有散热方式主要有背板散热和铝挤（铝制挤出式散热型材）散热， 背板 散热方式由于要求整个背板都采用铝或铝质合金制成， 成本较高， 不符合低成 本设计要求， 故不常采用； 如图 3所示， 铝挤散热方式是指： 将 LED7封装于 MCPCB ( Metal Core PCB, 金属基印刷电路板）形成 LED灯条， 再将 LED灯 条通过导热胶粘附固定在铝挤 8上， 铝挤 8设置在背板 9上。 该结构的背光模 组存在如下缺陷：
1、 需要进行 LED与 MCPCB进行封装形成灯条以及将灯条粘附在铝挤 8 上的工序， 耗费工时及材料；
2、 结构繁杂， 导致热阻界面增加， 不利于提升散热性能。 发明内容
本发明所要解决的技术问题在于， 提供一种背光模组及采用该背光模组的 液晶显示装置， 可在导热腔的内部形成空气流通的通道， 提升散热效果； 可以 免去光源与 MCPCB 进行封装形成灯条以及将灯条粘附在铝挤上的工序， 减小 热阻界面， 节省装配材料。
为了解决上述技术问题， 本发明的实施例提供了一种背光模组， 包括光源 和铝挤， 所述光源固定在所述铝挤上， 所述铝挤包括至少一个导热腔， 所述导 热腔是具有开口的中空贯通结构。
优选的， 所述光源固定在所述导热腔的外壁上。
优选的， 所述铝挤还包括： 用以增加与外部空气接触面积的延长板， 所述 延长板自所述导热腔的任一壁面延伸设置。
优选的， 所述延长板的两侧端分别与所述导热腔的两相对开口端保持平齐。 优选的， 所述延长板的表面喷涂散热漆或辐照散热的散热层。
优选的， 所述延长板包括设置相互垂直的横板和竖板， 所述横板或竖板与 所述背光模组的背板拼接为一体。
优选的， 所述导热腔的截面呈方形。
优选的， 所述导热腔的外表面喷涂散热漆或辐照散热的散热层。
本发明还公开了一种具有上述背光模组结构的液晶显示装置。
本发明所提供的背光模组及采用该背光模组的液晶显示装置， 背光模组包 括光源和铝挤， 铝挤包括至少一个导热腔， 导热腔是具有开口的中空贯通结构， 光源 LED直接封装在导热腔的外壁上， 背光模组可在导热腔的内部形成空气流 通的通道， 提升散热效果； 可以免去光源与 MCPCB 进行封装形成灯条以及将 灯条粘附在铝挤上的工序， 减小热阻界面， 节省装配材料。 附图说明
图 1是本发明背光模组实施例一的局部剖视结构示意图；
图 2是本发明背光模组实施例二的局部剖视结构示意图；
图 3是现有技术中的背光模组的局部剖视结构示意图。 具体实施方式
下面参考附图对本发明的优选实施例进行描述。
本发明实施例提供了一种背光模组， 包括： 光源 1和铝挤 2, 光源 1固定在 铝挤 2上， 铝挤 2包括至少一个导热腔 21 , 导热腔 21是具有开口的中空贯通结 构。 本发明的背光模组通过设置导热腔 21 ,在导热腔 21的内部形成空气流通的 通道， 增加了空气的流动性， 使铝挤 1上的热量能够由导热腔 21迅速的传递到 外部； 此外， 导热腔 21的中空结构还具有增大铝挤 1与空气接触面积的效果， 有利于背光模组更高效地散热。 以下具有说明背光模组的结构。
实施例 1:
参见图 1 , 背光模组具有光源 1和铝挤 2, 光源 1固定在铝挤 2上。 铝挤 2 由导热腔 21和延长板 22组成。 其中， 导热腔 21是由首尾相接的四侧侧壁围挡 而成， 截面呈方形。 导热腔 21的相对两端设置开口， 并在内部形成中空的呈柱 状的空气流通通道， 光源 1被直接封装在导热腔 21的任意一个侧壁的外壁上。
本发明的背光模组在实施时， 光源 LED产生的热量由导热腔 21 的侧壁传 导到导热腔 21中， 由于导热腔 21的相对两端设置开口， 导热腔 21内部的空气 因受热而密度变低并发生定向流动。 此时， 在导热腔 21的内部便形成了空气流 通的通道， 加速其中热量的散失； 在此过程中， 导热腔 21的四侧侧壁也同步参 与热量传导， 增大整个铝挤与外部空气的接触面积， 实现高效散热。
通过设置导热腔 21 , 在提升散热效率的同时， 也因具有更优的散热性能， 铝挤上的工序， 节省装配材料； 光源 LED直接封装在导热腔 21的外壁上， 同 时也减少了热阻界面， 达到辅助散热的目的。
优选的， 可以在导热腔 21的外表面喷涂散热漆或辐照散热的散热层（图未 示）， 加速热量的散失， 达到更好的散热效果。
上述实施例中将导热腔 21设置为截面呈方形形状的作用是： 材料使用量相 等的情况下， 截面呈方形铝挤的表面积大于其他截面形状铝挤的表面积， 可以 增大铝挤的散热面积， 并能保证铝挤的强度。 当然， 导热腔 21也可设置为其他 形状的截面， 如圆形， 常见多边形等， 均能够达到上述更高效地散热的效果。
延长板 22 自导热腔 21的四侧侧壁中的任一个壁面延伸设置， 其用于增加 铝挤与外部空气的接触面积， 加速导热腔 21中热量的散失。
优选的， 为使延长板 22能够达到最佳的散热性能， 可以保持延长板 22的 两侧端分别与导热腔 21的两相对开口端平齐，或是在延长板 22的表面全部（或 部分）喷涂散热漆或辐照散热的散热层（图未示）。
实施例 2: 参见图 2, 本实施例是将设有导热腔 21的铝挤应用在直下式背光模组上的 实施例， 该实施例与上述实施例 1的不同之处在于： 延长板 22包括有设置相互 垂直的横板和竖板，光源 LED设置在与如图所示横板处于同一平面的导热腔 21 的外壁上。 该实施方式中设置的横板除具有提升散热效果的功效外， 其还可以 作为与背光模组的背板相连接的连接件， 通过横板与背光模组的背板的拼接， 达到低成本设计的要求。
本发明背光模组的其他实施方式中， 导热腔可以根据实际的设计要求设置 为多个， 导热腔也可以根据实际的散热需求设置一个或两个以上的开口端， 只 要满足导热腔是具有开口的中空贯通结构即可。
本发明还开了一种液晶显示装置， 该液晶显示装置包括上述的一种或多种 实施结构的背光模组， 具体实施方式不再赘述。
实施本发明的背光模组及采用该背光模组的液晶显示装置， 具有如下有益 效果： 背光模组包括光源和铝挤， 铝挤包括至少一个导热腔， 导热腔是具有开 口的中空贯通结构， 光源 LED直接封装在导热腔的外壁上， 背光模组可在导热 腔的内部形成空气流通的通道， 提升散热效果； 可以免去光源与 MCPCB 进行 封装形成灯条以及将灯条粘附在铝挤上的工序， 减小热阻界面， 节省装配材料。

Claims

权 利 要 求
1、 一种背光模组， 包括光源和铝挤， 所述光源固定在所述铝挤上， 其中， 所述铝挤包括至少一个导热腔， 所述导热腔是具有开口的中空贯通结构。
2、 如权利要求 1所述的背光模组， 其中， 所述光源固定在所述导热腔的外 壁上。
3、 如权利要求 1所述的背光模组， 其中， 所述铝挤还包括： 用以增加与外 部空气接触面积的延长板， 所述延长板自所述导热腔的任一壁面延伸设置。
4、 如权利要求 3所述的背光模组， 其中， 所述延长板的两侧端分别与所述 导热腔的两相对开口端保持平齐。
5、 如权利要求 4所述的背光模组， 其中， 所述延长板的表面喷涂散热漆或 辐照散热的散热层。
6、 如权利要求 3所述的背光模组， 其中， 所述延长板包括设置相互垂直的 横板和竖板， 所述横板或竖板与所述背光模组的背板拼接为一体。
7、 如权利要求 1所述的背光模组， 其中， 所述导热腔的截面呈方形。
8、 如权利要求 1所述的背光模组， 其中， 所述导热腔的外表面喷涂散热漆 或辐照散热的散热层。
9、 一种液晶显示装置， 包括背光模组， 其中， 所述背光模组包括： 光源和 铝挤， 所述光源固定在所述铝挤上， 其中， 所述铝挤包括至少一个导热腔， 所 述导热腔是具有开口的中空贯通结构。
10、 如权利要求 9所述的液晶显示装置， 其中， 所述光源固定在所述导热 腔的外壁上。
11、 如权利要求 9所述的液晶显示装置， 其中， 所述铝挤还包括： 用以增 加与外部空气接触面积的延长板， 所述延长板自所述导热腔的任一壁面延伸设 置。
12、 如权利要求 11所述的液晶显示装置， 其中， 所述延长板的两侧端分别 与所述导热腔的两相对开口端保持平齐。
13、 如权利要求 12所述的液晶显示装置， 其中， 所述延长板的表面喷涂散 热漆或辐照散热的散热层。
14、 如权利要求 11所述的液晶显示装置， 其中， 所述延长板包括设置相互 垂直的横板和竖板， 所述横板或竖板与所述背光模组的背板拼接为一体。
15、 如权利要求 9所述的液晶显示装置， 其中， 所述导热腔的截面呈方形。
16、 如权利要求 9所述的液晶显示装置， 其中， 所述导热腔的外表面喷涂 散热漆或辐照散热的散热层。
17、 一种液晶显示装置， 包括背光模组， 其中， 所述背光模组包括： 光源 和铝挤， 所述铝挤包括至少一个导热腔， 所述导热腔是具有开口的中空贯通结 构， 所述铝挤还包括： 用以增加与外部空气接触面积的延长板， 所述延长板自 所述导热腔的任一壁面延伸设置；
所述光源固定在所述导热腔的外壁上。
18、 如权利要求 17所述的液晶显示装置， 其中， 所述延长板的表面喷涂散 热漆或辐照散热的散热层。
19、 如权利要求 17所述的液晶显示装置， 其中， 所述延长板包括设置相互 垂直的横板和竖板， 所述横板或竖板与所述背光模组的背板拼接为一体；
所述延长板的两侧端分别与所述导热腔的两相对开口端保持平齐。
20、如权利要求 17所述的液晶显示装置， 其中， 所述导热腔的截面呈方形。
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