WO2013170503A1 - 背光模块及显示装置 - Google Patents

背光模块及显示装置 Download PDF

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Publication number
WO2013170503A1
WO2013170503A1 PCT/CN2012/076387 CN2012076387W WO2013170503A1 WO 2013170503 A1 WO2013170503 A1 WO 2013170503A1 CN 2012076387 W CN2012076387 W CN 2012076387W WO 2013170503 A1 WO2013170503 A1 WO 2013170503A1
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WO
WIPO (PCT)
Prior art keywords
back plate
backlight module
protrusions
recess
degrees
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/CN2012/076387
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English (en)
French (fr)
Inventor
顾毓波
贾沛
杨流洋
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
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/697,765 priority Critical patent/US8915638B2/en
Publication of WO2013170503A1 publication Critical patent/WO2013170503A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • 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
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the present invention relates to a backlight module and a display device, and more particularly to a backlight module and a display device capable of improving heat dissipation efficiency.
  • Liquid crystal display (Liquid Crystal Display, LCD) has been widely used in a variety of electronic products, most of the liquid crystal display is a backlight type liquid crystal display, which is composed of a liquid crystal display panel and a backlight module (backlight Module).
  • the backlight module can be divided into a side-light type and a direct-light type according to the incident position of the light source (Direct-light) Type) Two to provide a backlight to the LCD panel.
  • Direct-light Direct-light
  • the heat dissipation method of the liquid crystal display is quite important.
  • the light source is, for example, a light emitting diode (Light) Emitting Diode, LED), which is set on the backplane.
  • the heat of the light-emitting diode is easily accumulated in a specific area of the backlight module, causing a problem of uneven heat dissipation, which affects the light-emitting efficiency of the light-emitting diode and the display quality of the liquid crystal display.
  • the invention provides a backlight module and a display device to solve the heat dissipation problem of the backlight module.
  • a main purpose of the present invention is to provide a backlight module.
  • the backlight module includes: a back plate having opposite first and second faces, wherein the back plate includes a plurality of back plate protrusions and corresponding back plate recesses thereof.
  • the back plate convex portion is formed on the first surface, and the back plate convex portion has a reflective inclined surface, the back plate concave portion is formed on the second surface; and a plurality of light sources are disposed on the back surface
  • the first side of the board is located between the protrusions of the back board.
  • the backlight module includes: a back plate having opposite first and second faces, wherein the back plate includes a plurality of back plate protrusions and corresponding back plate recesses thereof
  • the back plate convex portion is formed on the first surface, and the back plate convex portion has a reflective inclined surface, the back plate concave portion is formed on the second surface, the reflective inclined surface and the back plate
  • the angle between is between 135 degrees and 180 degrees; and a plurality of light sources disposed on the first side of the backboard and located between the back panel protrusions, wherein the backplane
  • the height of the protrusion is lower than the height of the top surface of the light source.
  • the backlight module includes: a back plate having opposite first and second faces, wherein the back plate includes a plurality of back plate protrusions and corresponding back plate recesses, and the back plate protrusions are formed on the first And the back plate convex portion has a reflective inclined surface, the back plate concave portion is formed on the second surface; and a plurality of light sources are disposed on the first surface of the back plate, and are located at the Between the convex portions of the back plate.
  • the reflective slope is an inclined plane or an inclined curved surface.
  • the angle between the reflective bevel and the backing plate is between 135 and 180 degrees.
  • the angle between the reflective slope and the backing plate is between 165 degrees and 180 degrees.
  • the height of the back plate protrusion is lower than the height of the top surface of the light source.
  • the at least a portion of the back plate recess is located in a high temperature region of a temperature profile of the backing plate, and the temperature profile is formed in the back plate recess
  • the backing plate is previously measured in advance.
  • the back plate recess is a plurality of scattered dot-shaped recesses.
  • the backlight module further includes a plurality of fluid passages for circulating a heat dissipation fluid, and at least a portion of the fluid passages are received in the recess of the back plate.
  • the fluid passage is a U-shaped metal tube or an S-shaped metal tube.
  • the backlight module and the display device of the present invention can increase the heat dissipation area of a partial area of the back plate, which is determined according to the position of the light source, so that the light source can be efficiently dissipated.
  • the heat. Therefore, the backlight module and the display device of the present invention can improve the heat dissipation effect and uniformize the temperature distribution to ensure the display quality of the display device.
  • light reflection at the gap of the light source can be increased to improve the unevenness of light emission between the light sources, and to ensure uniformity of light emission of the backlight module.
  • FIG. 1 is a schematic view of an embodiment of a display device of the present invention
  • FIG. 2A is a partial cross-sectional view showing an embodiment of a backlight module of the present invention
  • 2B and 2C are partial cross-sectional views showing an embodiment of a back sheet of the present invention.
  • Figure 3 is a bottom plan view of an embodiment of the back sheet of the present invention.
  • Figure 4 is a bottom plan view of another embodiment of the back sheet of the present invention.
  • Figure 5 is a partial cross-sectional view showing still another embodiment of the backlight module of the present invention.
  • FIG. 1 is a schematic view of an embodiment of a display device according to the present invention
  • FIG. 2A is a partial cross-sectional view showing an embodiment of a backlight module of the present invention
  • the backlight module 100 can be, for example, a direct type backlight module that is disposed relative to a display panel 101 (eg, a liquid crystal display panel) to form a display device (eg, a liquid crystal display device).
  • the backlight module 100 can include a back plate 110, a light source 120, an optical film 130, and a support post 140.
  • the back plate 110 is used to carry the light source 120 and the optical film 130.
  • the light source 120 is disposed on the back plate 110 for emitting light to provide light to the display panel 101.
  • the optical film 130 is disposed above the light source 120 to improve the uniformity of illumination or the luminous efficiency of the light source 120.
  • the support post 140 is disposed on the back plate 110 for supporting the optical film 130 on the light source 120.
  • FIG. 2A to 3C, FIG. 2B and FIG. 2C are partial cross-sectional views showing an embodiment of a back sheet of the present invention
  • FIG. 3 is a bottom view of an embodiment of the back sheet of the present invention.
  • the back sheet 110 of the present embodiment is made of an opaque material, such as a plastic material, a metal material or a combination of the above materials.
  • the material of the back sheet 110 is preferably a metal having good thermal conductivity, such as aluminum.
  • the back plate 110 has opposite first and second faces 111 and 112, wherein the back plate 110 includes a plurality of back plate protrusions 113 and a corresponding plurality of back plate recesses 114.
  • the back plate protrusions 113 are formed on the first side.
  • the back plate recess 114 is formed on the second surface 112 (back surface) to increase the heat dissipation area of the back plate 110 and improve the heat dissipation effect of the back plate 110.
  • These back plate convex portions 113 and their corresponding back plate concave portions 114 can be manufactured by an integral molding method such as pressing, precision casting, casting, machining, die casting, or forging, as needed.
  • These back plate protrusions 113 may have different cross-sectional shapes such as a circular arc shape, a triangular shape, a rectangular shape, or any other shape.
  • the back plate protrusions 113 may be a plurality of elongated protrusions arranged between the light sources 120.
  • the back plate protrusions 113 are located in a high temperature region of a temperature profile of the backing plate 110, the temperature profile being pre-formed before the back plate protrusions 113 are formed on the backing plate 110.
  • the measurement is used to know the heat concentration of the backing plate 110.
  • the temperature in the high temperature region of the temperature profile is about greater than the intermediate temperature, which is the average of the highest and lowest temperatures of the backing plate 110. Therefore, the back plate recess 114 (the back plate convex portion 113) may be disposed only in a partial region (high temperature region) of the back plate 110 to improve the heat concentration of the back plate 110.
  • the backplate recesses 114 may be arranged in all areas on the second side 112 of the backing plate 110.
  • the light source 120 can be, for example, a light emitting diode (Light-Emitting). Diode, LED), Organic Light Emitting Diode (OLED), Cold Cathode Fluorescent Tube (Cold Cathode) Fluorescent Lamp, CCFL), Electro-Luminescence (EL) component or LED strip (light) Bar).
  • the light source 120 can be an LED light bar arranged on the first surface 111 of the back plate 110.
  • Each LED light bar can be composed of a plurality of LED die 121 and a circuit board 122 (eg, a printed circuit board).
  • the LED die 121 can be disposed on the circuit board 122 for illumination.
  • each of the back plate protrusions 113 has a reflective slope 115, and the reflection slope 115 is formed on a side surface of the back plate protrusion 113 for reflecting light between the light sources 120 to the display panel.
  • 101 is emitted to increase the amount of light emitted at the gap of the light source 120 to homogenize the light of the plurality of light sources 120, thereby improving the uneven illumination between the light sources 120, that is, hot spots (hot) Spot) question.
  • the reflective slope 115 of the back plate protrusion 113 may be an inclined plane or an inclined curved surface, and the angle ⁇ between the reflective slope 115 and the back plate 110 (the first surface 111) is preferably between 135 degrees and 180 degrees.
  • the height of the back plate protrusion 113 is preferably lower than the top surface of the light source 120 (for example, the light emitting surface of the LED die 121). The height is to ensure the amount of light emitted at the gap of the light source 120.
  • the optical film 130 of the present embodiment is, for example, a diffusion sheet, a prism sheet, and a brightness enhancement film (Brightness). Enhancement Film, BEF), Reflective Brightness Enhancement Film (Dual Brightness Enhancement) Film, DBEF), non-multilayer film reflective polarizer (Diffused Reflective Polarizer) Film, DRPF) or any combination of the above, located on light source 120.
  • Enhancement Film BEF
  • Reflective Brightness Enhancement Film Dual Brightness Enhancement
  • DBEF Reflective Brightness Enhancement Film
  • DBEF Reflective Brightness Enhancement Film
  • DRPF non-multilayer film reflective polarizer
  • the support post 140 of the present embodiment is disposed on the first surface 111 of the back plate 110 for supporting the optical film 130, and the optical film 130 is easily deformed due to its own weight.
  • the support post 140 can be integrally formed on the back plate 110.
  • the support post 140 can also be disposed on the back plate 110 by welding, adhesive or screwing.
  • the inner side surface of the back sheet 110 may be attached or coated with a high reflectance material to form a reflective layer (not shown).
  • the high reflectivity material is, for example, silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, an alloy of any combination thereof, or yellowing resistance and heat resistance.
  • White reflective paint to reflect light is, for example, silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, an alloy of any combination thereof, or yellowing resistance and heat resistance.
  • White reflective paint to reflect light is, for example, silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, an alloy of any combination thereof, or
  • the arrangement shape, arrangement density or number of the back plate recesses 114 of the back sheet 110 of the present embodiment may be determined according to the heat distribution of the backlight module 100. If the position of the light source 120 on the backplane 110 has been determined, the backlight module 100 may have a specific heat distribution situation (temperature profile) after the light source 120 is normally illuminated for a predetermined period of time. For example, in a direct type backlight module, the heat of the light source may be concentrated in the middle area of the back sheet. Therefore, in the present embodiment, the back plate recess 114 may be arranged in an intermediate portion of the back plate 110, which corresponds to the heat concentrated distribution area of the back plate 110 (the high temperature region of the temperature profile) to increase the middle portion of the back plate 110.
  • the heat dissipation area can correspondingly improve the heat dissipation effect of the back plate 110 and uniformize the temperature distribution of the back plate 110.
  • the back plate recesses 114 may be arranged in other areas according to the heat distribution of the backlight module 100.
  • the back surface of the back plate 110 is provided with a plurality of back plate recesses 114 at positions corresponding to the light source 120, heat dissipation efficiency in the vicinity of the light source 120 can be increased to avoid The heat of the light source 120 is concentrated, and the luminous efficiency of the light source 120 can be ensured. Therefore, the back plate 110 of the backlight module 100 can improve the heat dissipation effect and uniformize the temperature distribution of the backlight module 100 to ensure the display quality of the display device. Moreover, by the reflective slope 115 of the back plate protrusion 113, the light reflection at the gap of the light source 120 can be increased to improve the uneven illumination between the light sources 120.
  • the back plate recess 214 of the back plate 110 may be a plurality of scattered dot-shaped recesses, that is, the back plate protrusions may be scattered dot-like protrusions.
  • the back plate recesses 214 may be arranged in the heat concentration distribution area of the back plate 110 and located between the light sources 120 to increase the heat dissipation area of the middle portion of the back plate 110, thereby correspondingly improving the heat dissipation effect of the back plate 110, and The temperature distribution of the backing plate 110 is homogenized.
  • the backlight module 100 may further include a plurality of fluid passages 360 for circulating a heat dissipation fluid 361 to rapidly conduct heat of the backing plate 110 to homogenize the temperature distribution on the backing plate 110.
  • the back plate recess 114 of the back plate 110 is an elongated recess, and at least a portion of the fluid passage 360 can be received in the back plate recess 114 of the back plate 110.
  • the fluid passage 360 can be, for example, a U-shaped metal tube or a continuous S-shaped metal tube, and the heat-dissipating fluid 361 can be a gas (such as air, N2, H2, He, Ar) or a liquid (such as water or coolant), which can be in a Flow is performed at a preset pressure, i.e., there may be a pressure differential between the inlet and outlet of the fluid passage 360, which may be generated by a pressurizing assembly, such as a pump (not shown). If necessary, the two ends of each of the two adjacent fluid passages 360 may be connected to each other by an appropriate passage to integrally form an S-shaped circulation system. Therefore, heat exchange by the flowing heat-dissipating fluid 361 can greatly improve the heat dissipation efficiency of the backing plate 110 in a limited space, and can effectively improve the deformation problem of the backing plate due to temperature unevenness.
  • a gas such as air, N2, H2, He, Ar
  • a liquid such as water or cool
  • the backlight module and the display device of the present invention can increase the heat dissipation area through the recess of the back plate of the back plate, and the arrangement of the concave portion of the back plate can be determined according to the position of the light source, so that the heat of the light source can be efficiently dissipated. Improve the heat concentration of the light source.
  • the light reflection at the light source gap can be increased by the reflection slope of the convex portion of the back plate to improve the uneven illumination between the light sources and ensure the uniformity of illumination of the backlight module.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Description

背光模块及显示装置 技术领域
本发明涉及一种背光模块及显示装置，特别是涉及一种可改善散热效率的背光模块及显示装置。
 背景技术
液晶显示器(Liquid Crystal Display，LCD)已被广泛应用于各种电子产品中，液晶显示器大部分为背光型液晶显示器，其是由液晶显示面板及背光模块(backlight module)所组成。背光模块可依照光源入射位置的不同分成侧向式入光(Side-light type)与直下式入光(Direct-light type)两种，以便提供背光源至液晶显示面板。
由于液晶显示器工作时所产生的热量会影响液晶显示器的效能，因而液晶显示器的散热方式相当地重要。在直下式背光模块中，光源例如为发光二极管(Light Emitting Diode，LED)，其设置背板上。然而，发光二极管的热量容易累积在背光模块的特定区域中，造成散热不均的问题，而影响发光二极管的发光效率及液晶显示器的显示质量。
故，有必要提供一种背光模块及显示装置，以解决现有技术所存在的问题。
 技术问题
本发明提供一种背光模块及显示装置，以解决背光模块的散热问题。
 技术解决方案
本发明的主要目的在于提供一种背光模块，背光模块包括：背板，具有相对的第一面及第二面，其中所述背板包括多个背板凸部及其对应的背板凹部，所述背板凸部形成于所述第一面上，且所述背板凸部具有反射斜面，所述背板凹部形成于所述第二面上；以及多个光源，设置于所述背板的所述第一面上，且位于所述背板凸部之间。
本发明的另一目的在于提供一种背光模块，背光模块包括：背板，具有相对的第一面及第二面，其中所述背板包括多个背板凸部及其对应的背板凹部，所述背板凸部形成于所述第一面上，且所述背板凸部具有反射斜面，所述背板凹部形成于所述第二面上，所述反射斜面与所述背板之间的角度是介于135度与180度之间；以及多个光源，设置于所述背板的所述第一面上，且位于所述背板凸部之间，其中所述背板凸部的高度是低于所述光源的顶面的高度。
本发明的又一目的在于提供一种显示装置，显示装置包括：背光模块；以及液晶显示面板。背光模块包括：背板，具有相对的第一面及第二面，其中所述背板包括多个背板凸部及其对应的背板凹部，所述背板凸部形成于所述第一面上，且所述背板凸部具有反射斜面，所述背板凹部形成于所述第二面上；以及多个光源，设置于所述背板的所述第一面上，且位于所述背板凸部之间。
在本发明的一实施例中，所述反射斜面为倾斜平面或倾斜曲面。
在本发明的一实施例中，所述反射斜面与所述背板之间的角度是介于135度与180度之间。
在本发明的一实施例中，所述反射斜面与所述背板之间的角度是介于165度与180度之间。
在本发明的一实施例中，所述背板凸部的高度是低于所述光源的顶面的高度。
在本发明的一实施例中，所述至少部分的所述背板凹部是位于所述背板的一温度分布图的一高温区域中，所述温度分布图是在所述背板凹部形成于所述背板之前所预先量测。
在本发明的一实施例中，所述背板凹部为多个散布点状凹部。
在本发明的一实施例中，背光模块还包括多个流体通道，用于流通一散热流体，至少部分的所述流体通道是容设于所述背板凹部内。
在本发明的一实施例中，所述流体通道为U形金属管或S形金属管。
 有益效果
相较于现有的背光模块具有热量集中的问题，本发明的背光模块和显示装置可增加背板的局部区域的散热面积，其是依据光源的设置位置来决定，因而可有效率地散逸光源的热量。因此，本发明的背光模块和显示装置可改善散热效果，并可均匀化温度分布，以确保显示装置的显示质量。再者，通过通过背板凸部的反射斜面，可增加光源间隙处的光反射，以改善光源之间的发光不均匀情形，确保背光模块的发光均匀性。
 附图说明
图1为本发明显示装置的一实施例的示意图；
图2A为本发明背光模块的一实施例的部分剖面图；
图2B及图2C为本发明背板的一实施例的部分剖面图；
图3为本发明背板的一实施例的下视图；
图4为本发明背板的另一实施例的下视图；以及
图5为本发明背光模块的又一实施例的部分剖面图。
 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的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」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。
在图中，结构相似的单元是以相同标号表示。
请参照图1及图2A，图1为本发明显示装置的一实施例的示意图，图2A为本发明背光模块的一实施例的部分剖面图。在本实施例中，背光模块100可例如为直下式背光模块，其相对于一显示面板101(例如液晶显示面板)来设置，而形成一显示装置(例如液晶显示装置)。背光模块100可包括背板110、光源120、光学膜片130及支撑柱140。背板110是用以承载光源120和光学膜片130。光源120是设置于背板110上，用以发光来提供光线至显示面板101。光学膜片130是设置于光源120上方，用以改善光源120的发光均匀性或发光效率。支撑柱140是设置于背板110上，用以支撑光学膜片130于光源120上。
请参照图2A至图3，图2B及图2C为本发明背板的一实施例的部分剖面图，图3为本发明背板的一实施例的下视图。本实施例的背板110是由不透光材质所制成，例如：塑胶材料、金属材料或上述材料的组合，背板110的材料优选为具有良导热性的金属，例如铝。背板110具有相对的第一面111和第二面112，其中背板110包括多个背板凸部113及其对应的多个背板凹部114，背板凸部113是形成于第一面111上，背板凹部114是对应于背板凸部113，而形成于第二面112(背面)上，用以增加背板110的散热面积，改善背板110的散热效果。这些背板凸部113及其对应的背板凹部114及可依需求而利用例如冲压、精密铸造、铸造、机械加工、压铸或锻造等一体成型方式来制造。这些背板凸部113可具有不同的剖面形状，例如圆弧形、三角形、矩形或其它任意形状。在本实施例中，这些背板凸部113可为排列于光源120之间的多个长条状凸部。在一实施例中，至少部分的背板凸部113是位于背板110的一温度分布图的一高温区域中，所述温度分布图是在背板凸部113形成于背板110之前所预先量测，用以得知背板110的热量集中情形。一般，此温度分布图的高温区域内的温度是约大于中间温度，此中间温度为背板110的最高温度与最低温度的平均。因此，背板凹部114(背板凸部113)可仅配置于背板110的局部区域(高温区域)中，以改善背板110的热量集中情形。然不限于此，在一些实施例中，背板凹部114可排列于背板110的第二面112上的全部区域。
如图1所示，光源120可例如为发光二极管(Light-Emitting Diode，LED)、有机发光二极管(Organic Light Emitting Diode，OLED)、冷阴极荧光灯管(Cold Cathode Fluorescent Lamp，CCFL)、电激发光(Electro-Luminescence，EL)组件或LED灯条(light bar)。在本实施例中，光源120可为LED灯条，其排列于背板110的第一面111上，每一LED灯条可由多个发光二极管晶粒121和电路板122(例如印刷电路板)所组成，发光二极管晶粒121可设置于电路板122上，以进行发光。
在本实施例中，如图2A所示，每一背板凸部113具有反射斜面115，反射斜面115是形成于背板凸部113的侧面，用于反射光源120之间的光线向显示面板101发出，以增加光源120间隙处的出光量，均匀化所述多个光源120的出光，而可改善光源120之间的发光不均匀情形，亦即热点(hot spot)问题。又，背板凸部113的反射斜面115可为倾斜平面或倾斜曲面，且反射斜面115与背板110(第一面111)之间的角度θ优选是介于135度与180度之间，例如介于165度与180度之间，又例如是介于135度与157.5度之间，以有效地反射光源120之间的光线来朝显示面板101发出，因而可改善背光模块100的热点问题。其中，背板凸部113的高度优选是低于光源120的顶面(例如发光二极管晶粒121的发光面) 的高度，以确保光源120间隙处的出光量。
如图2A所示，本实施例的光学膜片130例如为：扩散片、棱镜片、增亮膜(Brightness Enhancement Film，BEF)、反射式增亮膜(Dual Brightness Enhancement Film，DBEF)、非多层膜式反射偏光片(Diffused Reflective Polarizer Film，DRPF)或上述的任意组合，其位于光源120上。
如图2A所示，本实施例的支撑柱140是设置于背板110的第一面111上，用以支撑光学膜片130，而改善光学膜片130易因本身重量而发生挠曲的情形。此支撑柱140可一体成型于背板110上，然不限于此，支撑柱140亦可利用焊接、黏着或螺固等方式来设置于背板110上。
如图2A所示，在本实施例中，背板110的内侧面上(包括背板凸部113的表面)可贴附或涂布有高反射率材料，以形成反射层(未显示)。此高反射率材料例如为银、铝、金、铬、铜、铟、铱、镍、铂、铼、铑、锡、钽、钨、锰、其上述任意组合的合金或耐黄化且耐热的白色反射漆料，用以反射光线。
本实施例的背板110的背板凹部114的排列形状、排列密度或数量可依据背光模块100的热量分布情形来决定。若光源120在背板110上的位置已被决定，在光源120正常地发光一段预设时间后，背光模块100可具有特定的热量分布情形(温度分布图)。例如，在直下式背光模块中，光源的热量可能集中于背板的中间区域。因此，在本实施例中，背板凹部114可排列于背板110的中间区域，其对应于背板110的热量集中分布区(温度分布图的高温区域)，以提高背板110的中间部分的散热面积，因而可对应地改善背板110的散热效果，并可均匀化背板110的温度分布。然不限于此，背板凹部114亦可依据背光模块100的热量分布情形来排列于其它区域。
当背光模块100的光源120发光来提供背光至显示面板101时，由于背板110的背面在对应于光源120的位置设有多个背板凹部114，因而可增加光源120附近的散热效率，避免光源120的热量集中，且可确保光源120的发光效率。因此，背光模块100的背板110可改善散热效果，并均匀化背光模块100的温度分布，以确保显示装置的显示质量。再者，通过背板凸部113的反射斜面115，可增加光源120间隙处的光反射，以改善光源120之间的发光不均匀情形。
请参照图4，其为本发明背板的另一实施例的下视图。在另一实施例中，背板110的背板凹部214可为多个散布点状凹部，亦即背板凸部可为散布点状凸部。背板凹部214可排列于背板110的热量集中分布区中，且位于光源120之间，以提高背板110的中间部分的散热面积，因而可对应地改善背板110的散热效果，并可均匀化背板110的温度分布。
请参照图5，其为本发明背光模块的又一实施例的部分剖面图。在又一实施例中，背光模块100可更包括多个流体通道360，流体通道360是用于流通一散热流体361，以快速地传导背板110的热量，均匀化背板110上的温度分布。此时，背板110的背板凹部114为长条形的凹部，而至少部分的流体通道360可容设于背板110的背板凹部114内。流体通道360可例如为U形金属管或呈连续的S形金属管，散热流体361可为气体(如空气、N2、H2、He、Ar)或液体(如水或冷却剂)，其可在一预设压力下进行流动，亦即流体通道360的入口和出口之间可具有一压力差，此预设压力可通过一加压组件来产生，例如泵(未显示)。必要时，各二相邻流体通道360的两端另可利用适当通道相互连接，以使整体形成S形循环系统。因此，通过流动的散热流体361来进行热交换，可在有限的空间内大幅地提升背板110的散热效率，且可有效地改善背板因温度不均匀而产生的变形问题。
由上述可知，本发明的背光模块和显示装置可通过背板的背板凹部来增加散热面积，且背板凹部的配置可依据光源的设置位置来决定，因而可有效率地散逸光源的热量，改善光源的热量集中问题。再者，通过背板凸部的反射斜面，可增加光源间隙处的光反射，以改善光源之间的发光不均匀情形，确保背光模块的发光均匀性。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本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 (17)

  1. 一种背光模块，包括：
    背板，具有相对的第一面及第二面，其中所述背板包括多个背板凸部及其对应的背板凹部，所述背板凸部形成于所述第一面上，且所述背板凸部具有反射斜面，所述背板凹部形成于所述第二面上，所述反射斜面与所述背板之间的角度是介于135度与180度之间；以及
    多个光源，设置于所述背板的所述第一面上，且位于所述背板凸部之间，其中所述背板凸部的高度是低于所述光源的顶面的高度。
  2. 根据权利要求1所述的背光模块，其中所述反射斜面为倾斜平面或倾斜曲面。
  3. 根据权利要求1所述的背光模块，其中所述反射斜面与所述背板之间的角度是介于165度与180度之间。
  4. 根据权利要求1所述的背光模块，其中所述至少部分的所述背板凹部是位于所述背板的一温度分布图的一高温区域中，所述温度分布图是在所述背板凹部形成于所述背板之前所预先量测。
  5. 根据权利要求1所述的背光模块，其中所述背板凹部为多个散布点状凹部。
  6. 根据权利要求1所述的背光模块，还包括多个流体通道，用于流通一散热流体，至少部分的所述流体通道是容设于所述背板凹部内。
  7. 根据权利要求6所述的背光模块，其中所述流体通道为U形金属管或S形金属管。
  8. 一种背光模块，包括：
    背板，具有相对的第一面及第二面，其中所述背板包括多个背板凸部及其对应的背板凹部，所述背板凸部形成于所述第一面上，且所述背板凸部具有反射斜面，所述背板凹部形成于所述第二面上；以及
    多个光源，设置于所述背板的所述第一面上，且位于所述背板凸部之间。
  9. 根据权利要求8所述的背光模块，其中所述反射斜面为倾斜平面或倾斜曲面。
  10. 根据权利要求8所述的背光模块，其中所述反射斜面与所述背板之间的角度是介于135度与180度之间。
  11. 根据权利要求10所述的背光模块，其中所述反射斜面与所述背板之间的所述角度是介于165度与180度之间。
  12. 根据权利要求8所述的背光模块，其中所述背板凸部的高度是低于所述光源的顶面的高度。
  13. 根据权利要求8所述的背光模块，其中所述至少部分的所述背板凹部是位于所述背板的一温度分布图的一高温区域中，所述温度分布图是在所述背板凹部形成于所述背板之前所预先量测。
  14. 根据权利要求8所述的背光模块，其中所述背板凹部为多个散布点状凹部。
  15. 根据权利要求8所述的背光模块，还包括多个流体通道，用于流通一散热流体，至少部分的所述流体通道是容设于所述背板凹部内。
  16. 根据权利要求15所述的背光模块，其中所述流体通道为U形金属管或S形金属管。
  17. 一种显示装置，包括：
    显示面板；以及
    背光模块，包括：
    背板，具有相对的第一面及第二面，其中所述背板包括多个背板凸部及其对应的背板凹部，所述背板凸部形成于所述第一面上，且所述背板凸部具有反射斜面，所述背板凹部形成于所述第二面上；以及
    多个光源，设置于所述背板的所述第一面上，且位于所述背板凸部之间。
PCT/CN2012/076387 2012-05-15 2012-06-01 背光模块及显示装置 Ceased WO2013170503A1 (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105098089A (zh) * 2014-05-21 2015-11-25 乐金显示有限公司 有机发光二极管
EP3267245A1 (en) * 2016-07-04 2018-01-10 LG Electronics Inc. Display device
CN114779532A (zh) * 2018-12-05 2022-07-22 友达光电股份有限公司 背光模块

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105319773A (zh) * 2015-11-03 2016-02-10 青岛海信电器股份有限公司 一种背光模组和液晶显示设备
CN105739179A (zh) * 2016-04-05 2016-07-06 深圳市华星光电技术有限公司 一种背光模组以及液晶显示器
CN112433408A (zh) * 2018-12-20 2021-03-02 海信视像科技股份有限公司 显示装置
CN110297357B (zh) 2019-06-27 2021-04-09 厦门天马微电子有限公司 一种曲面背光模组的制备方法、曲面背光模组及显示装置
CN113192435B (zh) * 2021-05-31 2024-12-10 常州明耀半导体科技有限公司 一种光电半导体显示屏
CN116661195B (zh) * 2022-10-26 2025-12-30 惠科股份有限公司 背光模组及显示装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004342587A (ja) * 2003-04-22 2004-12-02 Advanced Display Inc バックライトおよびそれを用いた液晶表示装置
CN1664673A (zh) * 2005-04-14 2005-09-07 友达光电股份有限公司 背光模块及其形成方法
CN1808231A (zh) * 2005-01-19 2006-07-26 财团法人工业技术研究院 一种背光模块散热设计
CN1932603A (zh) * 2005-09-16 2007-03-21 鸿富锦精密工业（深圳）有限公司 直下式背光模组
CN201314495Y (zh) * 2008-12-18 2009-09-23 上海广电光电子有限公司 直下式背光模组
CN101676769A (zh) * 2008-09-18 2010-03-24 株式会社日立制作所 液晶显示装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1300632C (zh) * 2003-07-24 2007-02-14 友达光电股份有限公司 直下式背光模块
CN100371792C (zh) * 2004-12-30 2008-02-27 联准实业有限公司 直下式背光模块
KR100727856B1 (ko) * 2005-08-08 2007-06-14 희성전자 주식회사 발광다이오드를 광원으로 하는 직하형 백라이트의 반사판구조 및 이를 이용한 백라이트 장치
KR100790497B1 (ko) * 2005-10-11 2008-01-02 희성전자 주식회사 직하형 백라이트 장치
CN100517018C (zh) * 2006-03-10 2009-07-22 友达光电股份有限公司 背光模块
CN200993709Y (zh) * 2006-12-27 2007-12-19 上海广电光电子有限公司 背光模组

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004342587A (ja) * 2003-04-22 2004-12-02 Advanced Display Inc バックライトおよびそれを用いた液晶表示装置
CN1808231A (zh) * 2005-01-19 2006-07-26 财团法人工业技术研究院 一种背光模块散热设计
CN1664673A (zh) * 2005-04-14 2005-09-07 友达光电股份有限公司 背光模块及其形成方法
CN1932603A (zh) * 2005-09-16 2007-03-21 鸿富锦精密工业（深圳）有限公司 直下式背光模组
CN101676769A (zh) * 2008-09-18 2010-03-24 株式会社日立制作所 液晶显示装置
CN201314495Y (zh) * 2008-12-18 2009-09-23 上海广电光电子有限公司 直下式背光模组

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105098089A (zh) * 2014-05-21 2015-11-25 乐金显示有限公司 有机发光二极管
EP2947708A1 (en) * 2014-05-21 2015-11-25 LG Display Co., Ltd. Organic light emitting diode
US9680126B2 (en) 2014-05-21 2017-06-13 Lg Display Co., Ltd. Organic light emitting diode
EP3267245A1 (en) * 2016-07-04 2018-01-10 LG Electronics Inc. Display device
US10185176B2 (en) 2016-07-04 2019-01-22 Lg Electronics Inc. Display device
CN114779532A (zh) * 2018-12-05 2022-07-22 友达光电股份有限公司 背光模块
CN114779532B (zh) * 2018-12-05 2023-09-08 友达光电股份有限公司 背光模块

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