WO2012145941A1 - 背光模块及其散热涂料的涂布方式 - Google Patents

背光模块及其散热涂料的涂布方式 Download PDF

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Publication number
WO2012145941A1
WO2012145941A1 PCT/CN2011/073940 CN2011073940W WO2012145941A1 WO 2012145941 A1 WO2012145941 A1 WO 2012145941A1 CN 2011073940 W CN2011073940 W CN 2011073940W WO 2012145941 A1 WO2012145941 A1 WO 2012145941A1
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Prior art keywords
coating
heat
backlight module
light source
area
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PCT/CN2011/073940
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English (en)
French (fr)
Inventor
黄建发
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/260,325 priority Critical patent/US8752997B2/en
Publication of WO2012145941A1 publication Critical patent/WO2012145941A1/zh
Anticipated expiration legal-status Critical
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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
    • G02B6/0081—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

Definitions

  • the invention relates to a coating method of a backlight module and a heat dissipating paint thereof, in particular to a backlight module having a heat dissipating coating applied to a specific area of a backing plate.
  • LCDs liquid crystal displays (Liquid Crystal) Display
  • LCDs have gradually become the display of high-resolution color screens widely used in various electronic devices such as mobile phones, personal digital assistants, digital cameras, computer screens or notebook screens.
  • the backlight module is one of the basic components of the liquid crystal display. Since the liquid crystal itself does not emit light, it is necessary to provide a desired light source through the backlight module to display the desired image; the operation principle of the backlight module is to guide the light of the backlight into a planar light source through the light guide plate to ensure brightness. Uniformity.
  • Backlights commonly used in backlight modules are, for example, cold cathode fluorescent lamps and light emitting diodes (lighting) Array Diode, LED), etc.
  • the light-emitting diode has the advantages of environmental protection, small size, long life, easy driving, low power consumption and good shock resistance, and has gradually replaced the traditional lamp in the market.
  • the heat generated by the LED backlight can be conducted to the outside through the back plate to achieve the purpose of heat dissipation.
  • the temperature of the backing plate is not evenly distributed. Therefore, there is a certain temperature difference in different parts of the backlight cavity, and the thermal expansion and contraction effect caused by this temperature difference causes stress.
  • the stress brings two disadvantages.
  • the first disadvantage is that it affects the optical properties of the optical film, the light guide plate, etc., so that birefringence is generated, and the color unevenness occurs when the liquid crystal screen generates a picture (mura).
  • the second disadvantage is that the light guide plate and the back plate may be bent and deformed, which may further affect the light transmission and the uniformity of the light guide plate.
  • the manufacturer must try to maintain a uniform temperature distribution while the backlight module is dissipating heat to avoid the aforementioned disadvantages.
  • a backlight module includes a back panel and a first light source module.
  • the backboard has a first side and a second side, and the first side and the second side are both sides of the backboard.
  • the first light source module is disposed on the first side of the backboard, and includes a first substrate and a plurality of light emitting units connected to the first substrate.
  • the backing plate is coated with a heat dissipating paint for dissipating heat generated by the plurality of light emitting units, and the heat dissipating paint is applied to a first coating area of the backing plate, the first coating area Is a closed area composed of an arc and a straight line, the straight end of the first coating area is located at the first side, and an edge of the first coating area is curved toward the second side .
  • the backlight module includes a second light source module disposed on the second side of the backplane, and the second light source module includes a second substrate and a plurality of electrical connections.
  • the light emitting unit on the second substrate is used for emitting light, and the heat dissipating paint is further applied to a second coating area of the back sheet, and the second coating area is formed by an arc and a straight line.
  • the closed area, the linear end of the second coating area is located on the second side, and the edge of the second coating area is curved toward the first side.
  • the backboard further has a third side and a fourth side, and the first side, the second side, the third side, and the fourth side are respectively
  • the backlight module further has a third light source module and a fourth light source module, respectively located on the third side and the fourth side, and the heat dissipation coating is also coated a third coating region and a fourth coating region, wherein the third coating region and the fourth coating region are each a closed region formed by an arc and a straight line, and the third coating a straight end of the cloth region is located at the third side, an edge of the third coating region is curved toward the fourth side, and a straight end of the fourth coating region is located at the fourth side An edge of the fourth coating region is curved toward the third side.
  • the heat-dissipating paint is an infrared heat-dissipating paint having a thickness of between 0.2 cm and 0.3 cm.
  • the heat sink coating has a surface roughness of less than 10 microns.
  • a backlight module includes a backplane having four sides and at least one light source module.
  • Each of the light source modules is disposed on at least one side of the backplane, and each of the light source modules includes a substrate and a plurality of light emitting units electrically connected to the substrate for emitting light.
  • a heat dissipating coating is applied to the backing plate to form at least one row of hot zones, and each row of hot zones is correspondingly disposed on one side of each of the light source modules for emitting the plurality of illuminating lights. The heat emitted by the unit.
  • the at least one row of hot zones is a closed area formed by an arc and a straight line, the straight ends of the at least one row of hot zones are located at one of the side edges, and the edge of the at least one row of hot zones is curved It is protruding toward the center of the backboard.
  • the present invention discloses a coating method for a heat-dissipating paint for applying a heat-dissipating paint to a backlight module, wherein the backlight module includes a back plate and a first light source module, the back The first light source module is disposed on the first side of the back panel, and the coating method includes: defining the back panel a first coating region, the shape of the first coating region is a closed region formed by an arc and a straight line, and the straight end of the closed region formed by the curved line and the straight line is located at the first side. The edge of the first coating region is curved toward the second side; and the first coating region is coated with a heat-dissipating paint.
  • the backlight module includes a second light source module disposed on the second side of the backboard
  • the coating method further includes: defining a second coating region
  • the shape of the second coating region is a closed region formed by an arc and a straight line, the straight end of the second coating region is located at the second side, and the edge arc of the second coating region Forming a protrusion toward the first side; and coating the heat-dissipating paint on the second coating area.
  • the backlight module of the present invention performs coating of heat-dissipating paint only in a specific area of the back sheet, and these specific areas are areas in the prior art where the temperature of the back sheet is high. Therefore, when the backlight module dissipates heat through the backplane, since the heat dissipation performance of the region where the heat-dissipating coating is applied is better, the cooling effect is more remarkable, so that the temperature uniformity of the backlight module during heat dissipation is better, thereby avoiding In the prior art, the problem of stress is generated due to temperature unevenness.
  • the backlight module of the present invention performs coating of the heat-dissipating paint only in a specific area of the back sheet, and these specific areas are areas in the prior art where the temperature of the back sheet is high. Therefore, when the backlight module dissipates heat through the backplane, since the heat dissipation performance of the region where the heat-dissipating coating is applied is better, the cooling effect is more remarkable, so that the temperature uniformity of the backlight module during heat dissipation is better, thereby avoiding In the prior art, the problem of stress is generated due to temperature unevenness.
  • FIG. 1 is a schematic view showing the structure of a side-entry backlight module in which a heat-dissipating paint is applied in a specific region of the present invention.
  • FIG. 2 is a schematic view showing a back plate of a corresponding side-entry backlight module in a coating mode according to a first embodiment of the present invention.
  • FIG 3 is a schematic view showing a back plate of a corresponding side-entry backlight module in a coating mode according to a second embodiment of the present invention.
  • FIG. 4 is a schematic view showing a back plate of a corresponding side-entry backlight module in a coating mode according to a third embodiment of the present invention.
  • FIG. 1 is a schematic structural view showing a side-lit backlight module 100 for applying heat-dissipating paint to a specific area according to the present invention.
  • the side-lit backlight module 100 can be applied to a liquid crystal display.
  • the backlight module 100 includes a back plate 110, a light source module 120, a heat sink 150, and an optical component 140.
  • the light source module 120 is carried on the heat sink 150 for generating light.
  • the optical component 140 is configured to guide the light incident by the light source module 120 to a specific direction A and to emit from a light exit surface 142.
  • the heat generated by the operation of the light source module 120 is conducted to the backing plate 110 through the heat sink 150, and then dissipated to the external environment by heat convection through the air in contact with the backing plate 110.
  • the optical component 140 can be referred to as a light guide plate.
  • the bottom surface 146 of the optical component 140 can be provided with a plurality of circular or square diffusion structures (not shown).
  • the light source module 120 will inject light from the incident surface 148 of the optical component 140.
  • the reflected light will diffuse at various angles, destroying the total reflection condition and ejecting upward from the light exit surface 142 of the optical component 140, as indicated by the arrow A.
  • the optical component 140 can be uniformly illuminated by using a dense, differently sized diffusion structure pattern design.
  • the diffusion structure may also be a granular material having a different refractive index. Light is emitted from the light exit surface 142 of the optical component 140 by the scattering between the light and the particles.
  • the light source module 120 includes a substrate 126 and a plurality of light emitting diodes 122 disposed on the substrate 126.
  • the light source module 120 is disposed on a side of the incident surface 148 of the optical component 140 for generating light and directing the light toward the incident surface 148 of the optical component 140.
  • the substrate 126 can be a printed circuit board, a flexible circuit board, or a metal substrate.
  • the backing plate 110 of the present embodiment is coated with a heat-dissipating paint on a specific coating area for dissipating heat generated by the plurality of light-emitting units 122. For an embodiment in which a heat-dissipating paint is applied to a specific coating area on the backing plate 110, see the following description.
  • FIG. 2 is a schematic diagram showing a backplane of a corresponding side-entry backlight module in a coating mode according to a first embodiment of the present invention.
  • the backlight module 100 is a single-sided light-input backlight.
  • the light source module 120 is disposed on the left side of the backlight module 100, and no light source module is disposed on the other side.
  • the light emitted by the light source module 120 is conducted through the optical assembly 140 into a uniform planar light source to provide the brightness required for the liquid crystal display screen. Since the backplane temperature in the prior art is not uniformly distributed, the backing plate closer to the light source module 120 has a higher temperature.
  • the temperature of the central portion of the light source module 120 is higher than the temperature of the two portions of the light source module 120.
  • the heat transfer distance of the middle portion of the light source module 120 is greater than that of the light source module 120.
  • the sides of the module 120 are further apart. Therefore, in order to uniform the temperature of the backing plate 110, the heat-dissipating paint 130 is applied to the backing plate 110.
  • the coated area of the heat-dissipating paint 130 can be regarded as a heat-dissipating area (that is, a hatched area in FIGS. 2 to 4) having a specific position and shape to conduct heat energy.
  • the heat-dissipating paint 130 can be made of an infrared heat-dissipating paint, and the material thereof is selected from materials having an infrared emissivity of more than 0.96, an emission wavelength of 750 to 16,000 nm, and a power emissivity of more than 400 watts per square meter.
  • the coating area of the heat-dissipating paint 130 also needs to consider the heat radiation factor.
  • the coating of the heat-dissipating paint is only performed at a place where the temperature of the backing plate 110 is high, which is a preferred embodiment of the present invention. If the coating is applied in a lower temperature region, the heat-dissipating effect may be adversely affected. Therefore, in order to optimize the heat dissipation capability of the heat-dissipating paint during the coating of the heat-dissipating paint, the present invention facilitates the definition of a specific coating area on the back plate 110, and the coating area is a closed area formed by an arc and a straight line.
  • the straight end is located on the side of the light source module 120 (the left side of the back plate 110), and the edge of the closed area is curved toward the right side of the back plate 110.
  • the coated area is substantially the back plate 110.
  • the temperature of the back plate 110 is greater than 40 degrees Celsius, so the closed area formed by the arc and the straight line is only an embodiment, and different temperature distributions are better.
  • the coating area of different shapes is used. For example, if the structure of the backlight module itself and the position of the light source are changed, the coating area is correspondingly changed according to the temperature distribution thereof.
  • the backlight module when the backlight module is performing heat dissipation, since the area where the heat-dissipating paint 130 is applied is a region with a relatively high temperature, the heat dissipation performance after the heat-dissipating paint 130 is applied is better, and therefore, the cooling effect is more remarkable.
  • the temperature difference between the coating area and the other areas can be reduced, and the temperature uniformity of the backlight module 100 during heat dissipation can be better, thereby avoiding the problem of stress generated in the prior art due to temperature unevenness.
  • FIG. 3 is a schematic diagram showing a backplane of a corresponding side-entry backlight module in a coating mode according to a second embodiment of the present invention.
  • the backlight module 200 includes a back plate 110 and two light source modules (light Bar) 120.
  • the two light source modules 120 are respectively disposed on the left and right sides of the backlight module 200, and no light source modules are disposed on the upper and lower sides.
  • the back panel 110 and the two light source modules are disposed. 120 has the same functions and operations as the first embodiment, and thus its detailed functions will not be described again.
  • the heat dissipation coating 130 is also coated on the back plate 110.
  • the coating area of the heat dissipation coating 130 is different from that of the second embodiment, as shown in FIG.
  • the coated area of 130 in addition to the coated area of the first embodiment, adds another coated area to the right side.
  • the light source module 120 on the right side is added, and the light source module 120 also causes an increase in the temperature of the back plate 110. Therefore, the heat-radiating paint 130 should also be applied to this higher temperature region.
  • the heat-dissipating paint 130 symmetrically adds a corresponding coating area on the right side, and the shape is substantially the same as the left side. It is hereby disclosed that it should be understood by those skilled in the art, and therefore will not be described again.
  • FIG. 4 is a schematic diagram showing a backplane of a corresponding side-entry backlight module in a coating mode according to a third embodiment of the present invention.
  • the backlight module 300 includes a backplane 110 and a four-light source module 120.
  • the backlight module 300 is a four-side light-receiving backlight, in other words, the upper and lower sides of the backplane 110.
  • Each of the sides is provided with a light source module 120. Therefore, in this embodiment, the coating area of the heat-dissipating paint 130 should also be adjusted according to the installation position of the light source module 120.
  • the heat-dissipating paint 130 is coated on the upper, lower, left, and right sides of the backing plate 110, and is coated.
  • the cloth area is determined in a manner similar to that of the first embodiment, and is a closed area formed by an arc and a straight line, and protrudes from the curved edge to the opposite side according to the temperature distribution. Those skilled in the art will understand that it will not be further described herein.
  • the heat-dissipating paint 130 is coated at a coating area having a thickness of between 0.2 cm (mm) and 0.3 mm, and a surface roughness of less than 10 micrometers ( ⁇ m) has an optimum heat dissipation performance, which is based on It is known from the results of the experiment.
  • the heat-dissipating paint 130 may be implemented by other thicknesses or roughnesses and is not limited to the above values.
  • the heat-dissipating paint 130 may be applied by spraying the spray gun to the backing plate 110 or by brushing the surface of a specific region of the backing plate 110.
  • the present invention does not limit the manner in which the heat-dissipating paint is applied, and the mode is merely an embodiment and is not a limitation of the present invention.
  • the present invention uses the special coating method of the heat-dissipating paint 130 to make the heat dissipation efficiency of each region of the back plate 110 different, so that the region with a higher temperature can be cooled by the heat-dissipating paint 130.
  • the backlight module of the present invention can reduce the temperature difference of each region of the back plate 110 and achieve the purpose of uniformizing the temperature of each region, thereby improving the stress problem of the prior art and improving the display effect of the liquid crystal display.

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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)

Description

背光模块及其散热涂料的涂布方式 技术领域
本发明涉及一种背光模块及其散热涂料的涂布方式，尤指一种具有将散热涂料涂布至背板特定区域的背光模块。
 背景技术
功能先进的显示器渐成为现今消费电子产品的重要特色，其中液晶显示器(Liquid Crystal Display, LCD)已经逐渐成为各种电子设备如移动电话、个人数字助理、数字相机、计算机屏幕或笔记本电脑屏幕所广泛应用具有高分辨率彩色屏幕的显示器。
背光模块为液晶显示器的基础零件之一。由于液晶本身不会发光，需通过背光模块提供所需的光源，方能显示所需的影像；背光模块的操作原理，是通过导光板将背光源的光线导引成平面光源，来确保亮度的均匀性。背光模块常用的背光源例如有冷阴极荧光灯以及发光二极管(lighting emitting diode，LED)等。近年来，由于相较于传统灯管，发光二极管具有环保、体积小、寿命长、驱动容易、耗电量少以及耐震性佳等优点，在市场上已有逐渐取代传统灯管的趋势。
然而，在目前以LED作为背光源的背光模块中，LED背光源产生的热量可通过背板传导至外部，以达到散热的目的。但是，在散热过程中，背板温度并不是均匀分布的，因此，在背光腔不同部位会有一定的温差，而这个温差所导致的热胀冷缩效应，会产生应力。
所述应力会带来两个缺点，第一个缺点是影响光学膜片，导光板等的光学性能，使其产生双折射，进而使液晶屏幕产生画面时，发生色彩不均匀的状况(mura)。而第二个缺点是可能导致导光板与背板弯曲变形，进一步会影响导光板的光传导及匀光能力。
因此，业者必须设法使背光模块于散热时，仍能保持均匀的温度分布，以避免前述缺点的产生。
 技术问题
本发明的目的是提供一种散热涂料涂布至背板特定区域的背光模块，可使背光模块于散热时仍能保持均匀的温度分布，进而解决现有技术的问题。
 技术解决方案
根据本发明的实施例，本发明揭露一种背光模块，包含一背板及一第一光源模块。所述背板具有一第一侧边和一第二侧边，所述第一侧边和所述第二侧边为所述背板的两侧边。所述第一光源模块设置于所述背板的所述第一侧边上，其包含有一第一基板以及数个连接于所述第一基板上的发光单元。所述背板涂布有散热涂料，用来散发所述数个发光单元所发出的热，所述散热涂料涂布于所述背板的一第一涂布区域，所述第一涂布区域是由弧形与直线所构成的封闭区域，所述第一涂布区域的直线端位于所述第一侧边，所述第一涂布区域的边缘弧形是朝所述第二侧边突起。
根据本发明的实施例，所述背光模块包含一第二光源模块，设置于所述背板的所述第二侧边上，所述第二光源模块包含一第二基板以及数个电性连接于所述第二基板上的发光单元，用来发光，所述散热涂料还涂布于所述背板的一第二涂布区域，所述第二涂布区域是由弧形与直线所构成的封闭区域，所述第二涂布区域的直线端位于所述第二侧边，所述第二涂布区域的边缘弧形是朝所述第一侧边突起。所述背板还具有一第三侧边与一第四侧边，所述第一侧边、所述第二侧边、所述第三侧边、以及所述第四侧边分别为所述背板的四个侧边，所述背光模块还具有一第三光源模块与一第四光源模块，分别位于所述第三侧边与所述第四侧边上，所述散热涂料还涂布于一第三涂布区域以及一第四涂布区域，所述第三涂布区域与所述第四涂布区域的形状均为由弧形与直线所构成的封闭区域，所述第三涂布区域的直线端位于所述第三侧边，所述第三涂布区域的边缘弧形是朝所述第四侧边突出，所述第四涂布区域的直线端位于所述第四侧边，且所述第四涂布区域的边缘弧形是朝所述第三侧边突出。
根据本发明的实施例，所述散热涂料是一红外线散热涂料，所述散热涂料的厚度介于0.2厘米与0.3厘米之间。所述散热涂料的表面粗糙度小于10微米。
根据本发明的实施例，本发明揭露一种背光模块，包含具有四侧边的背板及至少一光源模块。所述至少一光源模块分别设置于所述背板的至少一侧边上，每一光源模块包含有一基板以及数个电性连接所述基板上的发光单元，用来发光。一散热涂料涂布于所述背板上以形成至少一排热区，每一排热区对应设置于每一光源模块位于所述背板的一侧边上，用来散发所述数个发光单元发出的热。所述至少一排热区是由弧形与直线所构成的封闭区域，所述至少一排热区的直线端位于其中一所述侧边位置处，所述至少一排热区的边缘弧形是朝所述背板的中心突出。
根据本发明的实施例，本发明揭露一种散热涂料的涂布方式，用来将散热涂料涂布于一背光模块，其中所述背光模块包含有一背板以及一第一光源模块，所述背板具有一第一侧边以及一第二侧边，所述第一光源模块设置于所述背板的所述第一侧边上，所述涂布方式包含有：于所述背板定义出一第一涂布区域，所述第一涂布区域的形状为一弧形与直线所构成的封闭区域，所述弧形与直线所构成的封闭区域的直线端位于所述第一侧边，所述第一涂布区域的边缘弧形是朝所述第二侧边突起；以及于所述第一涂布区域，涂布散热涂料。
根据本发明的实施例，所述背光模块包含一第二光源模块，设置于所述背板的所述第二侧边上，所述涂布方式另包含有：定义出一第二涂布区域，所述第二涂布区域的形状为弧形与直线所构成的封闭区域，所述第二涂布区域的直线端位于所述第二侧边，且所述第二涂布区域的边缘弧形是朝所述第一侧边突起；以及于所述第二涂布区域，涂布散热涂料。
相较于现有技术，本发明背光模块仅于背板的特定区域进行散热涂料的涂布，而这些特定区域便为原本现有技术中，背板温度较高的区域。因此，当背光模块透过背板进行散热时，由于涂布散热涂料的区域散热效能较佳，因此降温的效果较为显着，如此便可使背光模块散热时的温度均匀性更佳，进而避免现有技术中，因为温度不均而产生应力的问题。
 有益效果
本发明背光模块仅于背板的特定区域进行散热涂料的涂布，而这些特定区域便为原本现有技术中，背板温度较高的区域。因此，当背光模块透过背板进行散热时，由于涂布散热涂料的区域散热效能较佳，因此降温的效果较为显着，如此便可使背光模块散热时的温度均匀性更佳，进而避免现有技术中，因为温度不均而产生应力的问题。
附图说明
图1是显示本发明在特定区域涂布散热涂料的侧入式背光模块的结构示意图。
图2是显示本发明第一实施例的涂布方式下对应侧入式背光模块的背板示意图。
图3是显示本发明第二实施例的涂布方式下对应侧入式背光模块的背板示意图。
图4是显示本发明第三实施例的涂布方式下对应侧入式背光模块的背板示意图。
 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之特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「顶」、「底」、「水平」、「垂直」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。
请参阅图1，图1是显示本发明在特定区域涂布散热涂料的侧入式背光模块100的结构示意图。侧入式背光模块100可应用于液晶显示器之中，背光模块100包含一背板110、一光源模块120、一散热件150以及一光学组件140。光源模块120承载于散热件150上，用来产生光线。光学组件140用来将光源模块120射入的光线导引至一特定方向A并从一出光面142射出。光源模块120运作时产生的热量，会通过散热件150传导至背板110，再透过与背板110接触的空气以热对流的方式散逸至外部环境。
光学组件140可以是指一导光板，较佳地，光学组件140的底面146可以设置数个圆形或方形的扩散结构(未图示)。光源模块120会从光学组件140的入射面148射入的光线。当光线在底面146经过扩散结构作用后，反射光会往各个角度扩散，破坏全反射条件而自光学组件140的出光面142向上射出，如箭头A所示。利用疏密、大小不同的扩散结构图案设计，可使光学组件140均匀发光。扩散结构也可以是不同折射率的颗粒状材质。利用光与颗粒间的散射作用，让光从光学组件140的出光面142射出。
光源模块120包含基板126和多个放置于基板126上的发光二极管122。光源模块120设置于光学组件140的入射面148的侧边，用来产生光线，并将光线射向光学组件140的入射面148。优选地，基板126可以是印刷电路板、软性电路板或是金属基板。本实施例的背板110上在特定的涂布区域涂布有散热涂料，用来散发数个发光单元122发出的热。有关在背板110上特定的涂布区域涂布散热涂料的实施例，请见以下说明。
请参阅图2，图2是显示本发明第一实施例的涂布方式下对应侧入式背光模块的背板示意图。于本实施例中，背光模块100是采用单侧入光式背光，换言之，光源模块120设置于背光模块100的左侧，而其他侧并未设置任何光源模块。光源模块120所发出的光，通过光学组件140传导成均匀的平面光源，以提供液晶显示屏幕所须的亮度。由于在现有技术的背板温度并不是均匀分布的，越靠近光源模块120的背板具有较高的温度。对于一般长条状的光源模块120而言，位于光源模块120中心部分的温度较光源模块120两侧部分的温度更高，换而言之，光源模块120的中间部分的热传递的距离比光源模块120两侧的部分更远。因此，为了均匀背板110的温度，会把散热涂料130涂布背板110上。散热涂料130的涂布区域可视为排热区(也就是在图2至图4中的斜线区域)，所述排热区具有特定的位置与形状，以传导热能。优选地，散热涂料130可用红外线散热涂料，其材质是选用红外线发射率超过0.96，发射波长介于750～16000纳米，功率发射率大于400瓦每平方米的材料。
此外，散热涂料130的涂布区域还需要考虑热辐射因素。在背板110上，散热涂料130所附着位置与未附着散热涂料130的位置的温度存在温差。依据斯特凡-波尔兹曼定律(Stefan Boltzmann law)，R=σT4，其中R是每单位面积的幅射功率，T是物体的绝对温度，σ是斯特凡-波尔兹曼常数，因此将散热涂料130涂布在背板100靠近光源模块120中间部分的温度较高区域，其辐射效率会大于涂布在背板100靠近光源模块120两侧部分温度较低的区域。但另一方面，散热涂料130的热传导率不如金属背板110，因此会阻碍背板110与空气的热对流。因此，仅仅只在背板110温度较高的地方进行散热涂料的涂布，为本发明较佳的实作方式，若在温度较低的区域涂布，可能反而会影响其散热效果。因此，在进行散热涂料涂布时，为了优化散热涂料的散热能力，本发明便于背板110上，定义出了特定的涂布区域，此涂布区域呈一弧形与直线所构成的封闭区域，其直线端位于光源模块120侧(背板110的左侧边)，而该封闭区域的边缘弧形往背板110的右侧边突出，基本上，这个涂布区域大致上为背板110涂布散热涂料130前且室温摄氏25度时，背板110温度大于摄氏40度的区域，因此前述的弧形与直线所构成的封闭区域仅为一实施例，不同的温度分布较佳地会使用不同形状的涂布区域，举例来说，若改变背光模组自身结构以及光源设置位置，那么涂布区域也会根据其温度分布而对应地加以改变。
如此一来，当背光模块在进行散热时，由于涂布散热涂料130的区域均是温度较高的区域，涂布散热涂料130之后的散热效能较佳，因此，降温的效果较为显着，如此便可降低所述涂布区域与其他区域的温差，使背光模块100散热时的温度均匀性更佳，进而避免现有技术中，因为温度不均而产生应力的问题。
请参阅图3，图3是显示本发明第二实施例的涂布方式下对应侧入式背光模块的背板示意图。背光模块200包含有一背板110以及两光源模块(light bar)120。请注意，于本实施例中，两光源模块120分别设置于背光模块200的左右两侧，而上下两侧并无设置任何光源模块；此外，于本实施例中，背板110与两光源模块120与第一实施例具有相同的功能与操作，因此其详细功能便不再赘述。
请继续参阅图3，于本实施例中，背板110上也涂布有散热涂料130，但是，散热涂料130的涂布区域与第二实施例有所差异，如图3所示，散热涂料130的涂布区域，除了第一实施例的涂布区域之外，于右侧增加了另一个涂布区域。相同地，这是由于本实施例中，新增了右侧的光源模块120，光源模块120也会造成背板110温度的增加，因此，这个较高温的区域，也应涂布散热涂料130。散热涂料130于右侧对称地增加了一个对应的涂布区域，形状与左侧大致相同，揭露至此，此领域具有通常知识者应可理解，故不再赘述。
请参阅图4，图4是显示本发明第三实施例的涂布方式下对应侧入式背光模块的背板示意图。背光模块300包含有一背板110以及四光源模块120；在此请注意，于本实施例中，背光模块300是采四侧入光式背光，换而言之，于背板110之上下左右四个侧边，均设置有光源模块120。因此，于本实施例中，散热涂料130的涂布区域也应根据光源模块120的设置位置而作相应的调整，散热涂料130于背板110的上下左右四侧，都有涂布，而涂布区域的决定方式则与第一实施例的方式类似，呈一弧形与直线所构成的封闭区域，且根据温度的分布而由弧形边缘突出至对面一侧。本领域中的技术人员应可理解，故不另赘述于此。
此外，因为散热涂料130涂覆在背板110后，其表面容易粗糙不平，而这个厚度的起伏会影响散热。太厚的涂料涂层会影响“热传导”和“热对流”散热，而粗糙的表面会降低热对流的效果。因此，优选地，散热涂料130涂布在涂布区域的厚度在0.2厘米(mm)与0.3mm之间，且表面粗糙度小于10微米(μm)时会有最佳的散热性能，这是根据实验的结果而得知。然而，此仅为本发明的较佳实施例，并非本发明的限制，在实作上，散热涂料130也可其他厚度或粗糙度加以实施并不以上述数值为限。
此外，散热涂料130的涂布方式可以用喷枪喷射于背板110或是用刷子涂刷背板110的特定区域的表面。然而，本发明并未限制散热涂料的涂布方式，所述的方式仅为一实施例，并非本发明的限制。
简而言之，本发明通过散热涂料130的特殊涂布方式，使背板110各区域的散热效率而有所不同，使原本温度较高的区域，可通过散热涂料130，以较高的散热速率而散逸热量，因此，本发明背光模块可以降低背板110各区域的温度差，达到各区域温度均匀化的目的，进而改善现有技术的应力问题，使液晶显示器的显示效果更佳。
综上所述，虽然本发明已以较佳实施例揭露如上，但该较佳实施例并非用以限制本发明，该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
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Claims (15)

  1. 一种背光模块，包含：
    一背板，具有一第一侧边和一第二侧边，所述第一侧边和所述第二侧边为所述背板的相对两侧边；及
    一第一光源模块，设置于所述背板的所述第一侧边上，所述第一光源模块包含有一第一基板以及数个电性连接于所述第一基板上的发光单元，用来发光；
    其中所述背板涂布有散热涂料，用来散发所述数个发光单元发出的热，所述散热涂料涂布于所述背板的一第一涂布区域，所述第一涂布区域是由弧形与直线所构成的封闭区域，所述第一涂布区域的直线端位于所述第一侧边，所述第一涂布区域的边缘弧形是朝所述第二侧边突起。
  2. 根据权利要求1所述的背光模块，其特征在于：所述背光模块包含一第二光源模块，设置于所述背板的所述第二侧边上，所述第二光源模块包含一第二基板以及数个电性连接于所述第二基板上的发光单元，用来发光，所述散热涂料还涂布于所述背板的一第二涂布区域，所述第二涂布区域是由弧形与直线所构成的封闭区域，所述第二涂布区域的直线端位于所述第二侧边，所述第二涂布区域的边缘弧形是朝所述第一侧边突起。
  3. 根据权利要求2所述的背光模块，其特征在于：所述背板还具有一第三侧边与一第四侧边，所述第一侧边、所述第二侧边、所述第三侧边、以及所述第四侧边分别为所述背板的四个侧边，所述背光模块还具有一第三光源模块与一第四光源模块，分别位于所述第三侧边与所述第四侧边上，所述散热涂料还涂布于一第三涂布区域以及一第四涂布区域，所述第三涂布区域与所述第四涂布区域的形状均为由弧形与直线所构成的封闭区域，所述第三涂布区域的直线端位于所述第三侧边，所述第三涂布区域的边缘弧形是朝所述第四侧边突出，所述第四涂布区域的直线端位于所述第四侧边，且所述第四涂布区域的边缘弧形是朝所述第三侧边突出。
  4. 根据权利要求1所述的背光模块，其特征在于：所述散热涂料的厚度介于0.2厘米与0.3厘米之间。
  5. 根据权利要求1所述的背光模块，其特征在于：所述散热涂料的表面粗糙度小于10微米。
  6. 根据权利要求1所述的背光模块，其特征在于：所述散热涂料是红外线散热涂料。
  7. 一种背光模块，包含：
    一背板，具有四侧边；及
    至少一光源模块，所述至少一光源模块分别设置于所述背板的至少一侧边上，每一光源模块包含有一基板以及数个电性连接所述基板上的发光单元，用来发光；
    其中一散热涂料涂布于所述背板上以形成至少一排热区，每一排热区对应设置于每一光源模块位于所述背板的一侧边上，用来散发所述数个发光单元发出的热。
  8. 根据权利要求7所述的背光模块，其特征在于：所述至少一排热区是由弧形与直线所构成的封闭区域，所述至少一排热区的直线端位于其中一所述侧边位置处，所述至少一排热区的边缘弧形是朝所述背板的中心突出。
  9. 根据权利要求7所述的背光模块，其特征在于：所述散热涂料的厚度介于0.2厘米与0.3厘米之间。
  10. 根据权利要求7所述的背光模块，其特征在于：所述散热涂料的表面粗糙度小于10微米。
  11. 根据权利要求7所述的背光模块，其特征在于：所述散热涂料是红外线散热涂料。
  12. 一种散热涂料的涂布方式，用来将散热涂料涂布于一背光模块，其中所述背光模块包含有一背板以及一第一光源模块，所述背板具有一第一侧边以及一第二侧边，所述第一光源模块设置于所述背板的所述第一侧边上，所述涂布方式包含有：于所述背板定义出一第一涂布区域，所述第一涂布区域的形状为一弧形与直线所构成的封闭区域，所述第一涂布区域的直线端位于所述第一侧边，所述第一涂布区域的边缘弧形是朝所述第二侧边突起；以及于所述第一涂布区域，涂布散热涂料。
  13. 根据权利要求12所述的散热涂料的涂布方式，其特征在于：所述背光模块包含一第二光源模块，设置于所述背板的所述第二侧边上，所述涂布方式另包含有：
    定义出一第二涂布区域，所述第二涂布区域的形状为弧形与直线所构成的封闭区域，所述第二涂布区域的直线端位于所述第二侧边，且所述第二涂布区域的边缘弧形是朝所述第一侧边突起；以及
    于所述第二涂布区域，涂布散热涂料。
  14. 根据权利要求12所述的散热涂料的涂布方式，其特征在于：所述散热涂料的厚度介于0.2厘米与0.3厘米之间，所述散热涂料的表面粗糙度小于10微米。
  15. 根据权利要求12所述的散热涂料的涂布方式，其特征在于：所述散热涂料是红外线散热涂料。
PCT/CN2011/073940 2011-04-28 2011-05-11 背光模块及其散热涂料的涂布方式 Ceased WO2012145941A1 (zh)

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CN102829399A (zh) * 2012-09-04 2012-12-19 京东方科技集团股份有限公司 背板、背光模组及显示装置
TWI475267B (zh) * 2013-09-06 2015-03-01 茂林光電科技股份有限公司 導光結構
CN103644480A (zh) * 2013-12-26 2014-03-19 苏州茂立光电科技有限公司 灯具

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101017282A (zh) * 2007-02-27 2007-08-15 友达光电股份有限公司 液晶显示器及其使用的背光模块
JP2008299182A (ja) * 2007-06-01 2008-12-11 Hitachi Ltd 液晶表示装置
CN101338869A (zh) * 2008-08-11 2009-01-07 友达光电股份有限公司 背光模块及其组装方法
US20090096957A1 (en) * 2007-10-15 2009-04-16 Ikuo Hiyama Liquid Crystal Display Device
CN102003662A (zh) * 2010-11-18 2011-04-06 深圳市华星光电技术有限公司 局部加强散热的侧入式背光模块

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101070448A (zh) * 2006-05-11 2007-11-14 国研氮化股份有限公司 散热涂层及其制备方法和制作该散热涂层的组合物
KR20070112991A (ko) * 2006-05-24 2007-11-28 삼성전자주식회사 액정표시장치
CN101556008B (zh) * 2007-03-09 2012-02-01 友达光电股份有限公司 侧光式背光模块的组装方法
CN101290429B (zh) * 2007-04-19 2011-12-28 奇美电子股份有限公司 液晶显示器及其背光模组
JP2010073476A (ja) * 2008-09-18 2010-04-02 Fujifilm Corp バックライトユニットおよびこれを備えた液晶表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101017282A (zh) * 2007-02-27 2007-08-15 友达光电股份有限公司 液晶显示器及其使用的背光模块
JP2008299182A (ja) * 2007-06-01 2008-12-11 Hitachi Ltd 液晶表示装置
US20090096957A1 (en) * 2007-10-15 2009-04-16 Ikuo Hiyama Liquid Crystal Display Device
CN101338869A (zh) * 2008-08-11 2009-01-07 友达光电股份有限公司 背光模块及其组装方法
CN102003662A (zh) * 2010-11-18 2011-04-06 深圳市华星光电技术有限公司 局部加强散热的侧入式背光模块

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