WO2012129824A1 - 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
WO2012129824A1
WO2012129824A1 PCT/CN2011/073023 CN2011073023W WO2012129824A1 WO 2012129824 A1 WO2012129824 A1 WO 2012129824A1 CN 2011073023 W CN2011073023 W CN 2011073023W WO 2012129824 A1 WO2012129824 A1 WO 2012129824A1
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WO
WIPO (PCT)
Prior art keywords
convex portion
backlight module
light source
display device
light
Prior art date
Application number
PCT/CN2011/073023
Other languages
English (en)
French (fr)
Inventor
周革革
郭仪正
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/128,524 priority Critical patent/US20120249926A1/en
Priority to CN201180009518.6A priority patent/CN102971662B/zh
Publication of WO2012129824A1 publication Critical patent/WO2012129824A1/zh

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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
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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 disposed on the light incident side of the light guide plate.
  • the heat of the LED is likely to accumulate on one side of the liquid crystal display, causing a problem of uneven heat dissipation, which affects the luminous efficiency of the LED 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 liquid crystal display.
  • a main object of the present invention is to provide a backlight module, the backlight module including: a back plate having opposite first and second faces, wherein the back plate includes a plurality of protrusions formed on the second And a light source disposed on the first surface of the backing plate; wherein at least a portion of the convex portion is located in a high temperature region of a temperature profile of the backing plate, the temperature distribution The figure is pre-measured before the convex portion is formed on the back plate.
  • Another object of the present invention is to provide a backlight module, the backlight module including: a back plate having opposite first and second faces, wherein the back plate includes a plurality of protrusions formed on the first And a light source disposed on the first surface of the backing plate; wherein at least a portion of the convex portion is located in a high temperature region of a temperature profile of the backing plate, the temperature The distribution map is pre-measured before the convex portion is formed on the backboard, The temperature in the high temperature region is greater than the intermediate temperature, which is the average of the highest temperature and the lowest temperature of the backing plate.
  • Still another object of the present invention is to provide a display device including: a display panel; and a backlight module including: a back plate having opposite first and second faces, wherein the back plate includes a plurality of a convex portion formed on the second surface; and a light source disposed on the first surface of the back plate; wherein at least a portion of the convex portion is a temperature distribution on the back plate In a high temperature region of the figure, the temperature profile is pre-measured before the protrusions are formed on the backing plate.
  • the convex portion is a plurality of elongated protrusions.
  • the convex portion is a plurality of scattered dot-like convex portions.
  • the backlight module further includes a light guide plate disposed on the back plate, the light source is disposed on one side of the light guide plate, and the convex portion is arranged on the back plate.
  • the side, and the arrangement of the protrusions is a triangle.
  • the backlight module further includes a light guide plate disposed on the back plate, and the light source is disposed on the opposite first side and the second side of the back plate, the convex portion Arranging on the first side and the second side of the backboard, and the arrangement of the protrusions is a triangle.
  • the arrangement area, the arrangement density or the number of the convex portions on the first side of the backboard is smaller than the arrangement area and arrangement of the convex portions on the second side. Density or quantity.
  • the convex portion has a circular arc shape, a triangular shape or a rectangular shape.
  • the protrusions have a higher density of arrangement at the intermediate portion of the backing plate than on both sides of the backing plate.
  • the light source is interspersed on the first surface of the backboard, and the convex portion is formed at least in an intermediate position of the backboard.
  • the convex portion is integrally formed on the second surface.
  • 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.
  • 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.
  • FIG. 1 is a schematic view of a first embodiment of a display device of the present invention
  • Figure 2 is a bottom plan view of the first embodiment of the back sheet of the present invention.
  • Figure 3 is a cross-sectional view showing a first embodiment of the back sheet of the present invention.
  • FIG. 4 is a schematic view of a second embodiment of a backlight module of the present invention.
  • Figure 5 is a perspective view of a second embodiment of the backboard of the present invention.
  • FIG. 6 is a temperature distribution diagram of a second embodiment of a backlight module of the present invention.
  • Figure 7 is a bottom plan view of a second embodiment of the back sheet of the present invention.
  • Figure 8 is a partial cross-sectional view showing a third embodiment of the backlight module of the present invention.
  • Figure 9 is a bottom plan view of a fourth embodiment of the back sheet of the present invention.
  • Figure 10 is a cross-sectional view showing a fifth embodiment of the back sheet of the present invention.
  • Figure 11 is a cross-sectional view showing a sixth embodiment of the back sheet of the present invention.
  • Figure 12 is a cross-sectional view showing a seventh embodiment of the back sheet of the present invention.
  • the backlight module 100 is a laterally-lit 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 includes a back plate 110, at least one light source 120, a light guide plate 130, a reflective layer 140, and an optical film 150.
  • the back plate 110 is used to mount the light source 120, the light guide plate 130, the reflective layer 140, and the optical film 150.
  • the light source 120 is disposed on one side of the light guide plate 130 for laterally emitting light into the light guide plate 130, and is guided by the light guide plate 130 to emit light.
  • the reflective layer 140 is formed between the back plate 110 and the light guide plate 130 for reflecting the light of the light source 120.
  • the optical film 150 is disposed on the light guide plate 130 to improve the optical effect.
  • FIG. 2 is a bottom view of a first embodiment of the back sheet of the present invention
  • FIG. 3 is a cross-sectional view of the first embodiment of the back sheet of the present invention.
  • the back sheet 110 of the embodiment is made of an opaque material, such as a plastic material, a metal material, or a combination thereof.
  • the backplane 110 has a first surface 111 and a second surface 112.
  • the backplane 110 includes a plurality of protrusions 113 formed on the second surface 112 for increasing the heat dissipation area of the backplane 110. Cooling effect.
  • These convex portions 113 can be manufactured by an integral molding method such as pressing, precision casting, casting, machining, die casting, or forging, as needed.
  • these 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 convex portions 113 may be a plurality of elongated convex portions (as shown in FIG. 2). Wherein, at least a portion of the convex portion 113 is located in a high temperature region of a temperature profile of the back plate 110, and the temperature profile is pre-measured before the convex portion 113 is formed on the back plate 110 for learning the back The heat concentration of the board 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.
  • the light source 120 of this embodiment is, for example, a cold cathode fluorescent lamp (Cold Cathode Fluorescent). Lamp, CCFL), Light Emitting Diode (LED), Organic Light Emitting (Organic Light Emitting) Diode, OLED), Electro-Luminescence (EL), Light Bar, or any combination of the above.
  • Lamp CCFL
  • Light Emitting Diode LED
  • Organic Light Emitting Organic Light Emitting
  • OLED Organic Light Emitting
  • EL Electro-Luminescence
  • Light Bar or any combination of the above.
  • the light source 120 can be, for example, a light strip, which can include a circuit board and a light assembly (for example, LED), the circuit board is, for example, a printed circuit board (PCB) or a flexible printed circuit board (Flexible Printed) Circuits, FPC), the lighting components are set on the circuit board.
  • a light strip which can include a circuit board and a light assembly (for example, LED)
  • the circuit board is, for example, a printed circuit board (PCB) or a flexible printed circuit board (Flexible Printed) Circuits, FPC)
  • the lighting components are set on the circuit board.
  • the light guide plate 130 of the present embodiment utilizes injection molding (Injection). Molding) is made of a photocurable resin, polymethyl methacrylate (PMMA) or polycarbonate (PC) for guiding the light of the light source 120 to the liquid crystal display panel 101.
  • the light guide plate 130 has a light emitting surface 131, a light reflecting surface 132, and a side light incident surface 133.
  • the light-emitting surface 131 is formed on one side of the light guide plate 130 and faces the liquid crystal display panel 101.
  • the light-emitting surface 131 may have a matte surface treatment or a scattering point design to uniformize the light output of the light guide plate 130 and reduce the light unevenness (Mura). phenomenon.
  • the light-emitting surface 131 may be provided with a plurality of protruding structures (not shown) to further correct the direction of the light to increase the light collecting effect and improve the front luminance.
  • the protruding structures may be, for example, prismatic or semi-circular convex or concave structures.
  • the light reflecting surface 132 is formed on the other side of the light guiding plate 130 opposite to the light emitting surface 131 for reflecting light to the light emitting surface 131.
  • the light reflecting surface 132 of the light guide plate 130 is parallel to the light emitting surface 131.
  • the light reflecting surface 132 may be provided with a light guiding structure (not shown) for reflecting the guiding light to be emitted from the light emitting surface 131.
  • the light guiding structure of the light reflecting surface 132 is, for example, a continuous V-shaped structure, that is, a V-Cut structure, a matte surface structure, and a scattering point structure, so that the light guiding the light source 120 is sufficiently emitted from the light emitting surface 131.
  • the side light incident surface 133 is formed on one side or opposite sides of the light guide plate 130 , and corresponds to the light source 120 for allowing the light emitted by the light source 120 to enter the light guide plate 130 .
  • the side light incident surface 133 may have, for example, a V-shaped structure (V-Cut), an S-shaped wave structure, or a surface roughening treatment (not shown), thereby improving the incidence efficiency and optical coupling efficiency of the light.
  • the side light incident surface 133 is a plane that is perpendicular to the light reflecting surface 132.
  • the reflective layer 140 (or the reflective sheet) of the present embodiment is preferably a surface on which the light reflecting surface 132 of the light guide plate 130 is formed, and only the side light incident surface 133 for allowing light to enter is exposed and used for A light emitting surface 131 that emits light.
  • the reflective layer 140 can be made of a high reflectivity material such as silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, alloys of any combination thereof, resistant A yellowish, heat-resistant white reflective paint or any combination of the above materials to reflect light.
  • the optical film 150 of the present embodiment is, for example, a diffusion sheet, a prism sheet, and a reverse prism sheet (Turning Prism).
  • Sheet 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 thereof, is disposed on the light guide plate 130 to improve the optical effect of the light emitted from the light guide plate 130.
  • the position of the convex portion 113 of the back plate 110 of the present embodiment may be determined according to the position of the light source 120, that is, at least a portion of the convex portion 113 is located at or near the light source 120.
  • the light source 120 can be disposed only on one side of the light guide plate 130, that is, on one side of the back plate 110.
  • the convex portion 113 may be formed on the back surface (the second surface 112) of the back plate 110 and arranged adjacent to the side of the back plate 110 to facilitate heat dissipation of the light source 120, and may uniformize the back plate 110. Temperature distribution.
  • the arrangement shape, arrangement density, or number of the convex portions 113 of the back plate 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 general, a backlight module having a light source disposed on one side of a backplane may have a substantially triangular heat distribution.
  • the convex portions 113 may be arranged in a triangle corresponding to the heat distribution of the back plate 110 (the high temperature region of the temperature profile) to increase the heat dissipation area of the intermediate portion of the back plate 110, and thus may correspond The heat dissipation effect of the back plate 110 is improved, and the temperature distribution of the back plate 110 can be uniformized.
  • the convex portion 113 may be arranged in other shapes according to the heat distribution of the backlight module 100.
  • FIG. 3 there is shown a partial cross-sectional view of a backing plate in accordance with a first embodiment of the present invention.
  • the partial backing plate 110 is bent toward the second surface 112 (as shown in FIGS. 4 and 5), so that the convex portions 113 are integrally formed on the second surface 112.
  • the back surface of the back plate 110 is provided with a plurality of convex portions 113 at positions corresponding to the light source 120, heat dissipation efficiency near the light source 120 can be increased, and the light source can be avoided.
  • the heat of 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.
  • FIG. 4 is a schematic view of a second embodiment of a backlight module according to the present invention
  • FIG. 5 is a perspective view of a second embodiment of the backplane of the present invention. Only the differences between the present embodiment and the first embodiment will be described below, and the similarities are not described herein again.
  • the backlight module 200 of the second embodiment includes a back plate 210, two light sources 220, a light guide plate 230, a reflective layer 240, and an optical film 250.
  • the light source 220 of the second embodiment is, for example, a light bar disposed on the opposite first side 215 and the second side 216 of the back plate 210
  • the light guide plate 230 is disposed between the light sources 220 .
  • the back plate 210 has an opposite first surface 211 and a second surface 212.
  • the back plate 210 includes a plurality of protrusions 213 formed on the second surface 212 and adjacent to the first side 215 and the second side of the back plate 210, respectively.
  • the side 216 is configured to increase the heat dissipation area of the back plate 210 at the first side 215 and the second side 216 to facilitate heat dissipation of the light source 220.
  • FIG. 6 is a temperature distribution diagram of a second embodiment of the backlight module of the present invention
  • FIG. 7 is a bottom view of the second embodiment of the back panel of the present invention.
  • the position, arrangement shape, arrangement density or number of the convex portions 213 of the back plate 210 can be determined according to a temperature profile of the back plate 210, which is formed before the convex portion 213 is formed on the back plate 210. Pre-measurement.
  • the temperature profile can be measured using a temperature detector to indicate the temperature distribution of the backing plate 210 prior to forming the protrusions 213.
  • the first side 215 and the second side 216 of the back plate 210 are respectively located above and below the display device.
  • the high temperature region of the back plate 210 (as shown in FIG. 6 , the temperature of the high temperature region is about 32° C. or higher) is respectively close to the first side 215 and The second side 216, and the high temperature region of the backlight module 200 is approximately triangular. Therefore, the convex portions 213 of the back plate 210 may be arranged on the first side 215 and the second side 216, respectively, and are arranged in a triangular shape.
  • the arrangement area, the arrangement density or the number of the convex portions 213 located on the first side 215 of the back plate 210 may be smaller than The arrangement area, arrangement density, or number of the convex portions 213 of the second side 216 (corresponding to the lower side of the display device). Therefore, the convex portion 213 can be configured in advance according to the pre-measured temperature profile of the back plate 210 to uniformly dissipate heat of the backlight module 200, thereby ensuring the display quality of the display device.
  • FIG. 8 is a partial cross-sectional view showing a third embodiment of a backlight module of the present invention.
  • the backlight module of the third embodiment may be a direct-lighting type light-emitting backlight module.
  • the light source 320 is, for example, a plurality of light-emitting light strips, which are arranged in a distributed manner on the first surface 311 of the back-plate 310, and the back-plate 310
  • the convex portion 313 is formed on the second surface 312 and located between the light sources 320, and the convex portion 313 is preferably formed at least at an intermediate position of the back plate 310 to prevent the heat of the light source 320 from being concentrated in the middle position of the back plate 310. Homogenize the temperature distribution of the backlight module. Therefore, the convex portion 313 of the back plate 310 can improve the heat dissipation effect to ensure the display quality of the display device.
  • FIG. 9 is a bottom view of a fourth embodiment of the backboard of the present invention.
  • the convex portions 413 of the back plate 410 may be a plurality of scattered dot-like convex portions, which may be arranged in a triangle to distribute the heat corresponding to the back plate 410 to increase the heat dissipation area of the intermediate portion of the back plate 410, and thus correspondingly The heat dissipation effect of the backing plate 410 is improved, and the temperature distribution of the backing plate 410 can be uniformized.
  • FIG. 10 is a cross-sectional view showing a fifth embodiment of the back sheet of the present invention.
  • the convex portions 513 can have a higher arrangement density at the intermediate portion of the back plate 510, that is, a plurality of convex portions 513 are provided at the intermediate portion of the back plate 510.
  • the spacing between the convex portions 513 at the intermediate portion of the backing plate 510 is small to increase the heat dissipation area of the intermediate portion of the backing plate 510, and the heat concentration can be improved.
  • FIG. 11 is a cross-sectional view showing a sixth embodiment of the back sheet of the present invention.
  • a portion of the back plate 610 may protrude from the second face 612, thereby integrally forming the protrusions 613.
  • FIG. 12 is a cross-sectional view showing a seventh embodiment of the back sheet of the present invention.
  • the protrusions 713 can also be attached to the second surface 712 of the backing plate 710 by using a thermal conductive adhesive 714.
  • the backlight module and the display device of the present invention can increase the heat dissipation area through the convex portion of the back plate, and the arrangement of the convex portion is determined according to the installation position of the light source, thereby efficiently dissipating the heat of the light source and improving the light source.
  • the problem of heat concentration. 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.

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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。在侧向式入光背光模块中，光源例如为发光二极管(Light Emitting Diode，LED)，其设置导光板的入光面一侧。然而，发光二极管的热量容易累积在液晶显示器的一侧，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，以解决液晶显示器的散热问题。
技术解决方案
本发明的主要目的在于提供一种背光模块，所述背光模块包括：背板，具有相对的第一面及第二面，其中所述背板包括多个凸部，其形成于所述第二面上；以及光源，设置于所述背板的所述第一面上；其中，至少部分的所述凸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凸部形成于所述背板之前所预先量测。
本发明的另一目的在于提供一种背光模块，所述背光模块包括：背板，具有相对的第一面及第二面，其中所述背板包括多个凸部，其形成于所述第二面上；以及光源，设置于所述背板的所述第一面上；其中，至少部分的所述凸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凸部形成于所述背板之前所预先量测, 所述高温区域内的温度是大于中间温度，所述中间温度为所述背板的最高温度与最低温度的平均。
本发明的又一目的在于提供一种显示装置，所述显示装置包括：显示面板；以及背光模块，其包括：背板，具有相对的第一面及第二面，其中所述背板包括多个凸部，其形成于所述第二面上；以及光源，设置于所述背板的所述第一面上；其中，至少部分的所述凸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凸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，所述凸部为多个长条状凸部。
在本发明的一实施例中，所述凸部为多个散布点状凸部。
在本发明的一实施例中，所述背光模块还包括导光板，设置于所述背板上，所述光源设置于所述导光板的一侧，所述凸部排列于所述背板的所述侧，且所述凸部的排列形状为三角形。
在本发明的一实施例中，所述背光模块还包括导光板，设置于所述背板上，所述光源设置于所述背板的相对的第一侧和第二侧，所述凸部排列于所述背板的所述第一侧与所述第二侧，且所述凸部的排列形状为三角形。
在本发明的一实施例中，位于所述背板的所述第一侧的所述凸部的排列面积、排列密度或数量是小于所述第二侧的所述凸部的排列面积、排列密度或数量。
在本发明的一实施例中，所述凸部的剖面形状为圆弧形、三角形或矩形。
在本发明的一实施例中，相较于在所述背板的两侧，所述凸部在所述背板的中间部分处具较高的排列密度。
在本发明的一实施例中，所述光源散布地排列于所述背板的所述第一面上，所述凸部是至少形成于所述背板的中间位置。
在本发明的一实施例中，所述凸部是一体地形成于所述第二面上。
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。
 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。
附图说明
图1为本发明显示装置的第一实施例的示意图；
图2为本发明背板的第一实施例的仰视图；
图3为本发明背板的第一实施例的剖面图；
图4为本发明背光模块的第二实施例的示意图；
图5为本发明背板的第二实施例的立体示意图
图6为本发明背光模块的第二实施例的温度分布图；
图7为本发明背板的第二实施例的仰视图；
图8为本发明背光模块的第三实施例的部分剖面图；
图9为本发明背板的第四实施例的仰视图；
图10为本发明背板的第五实施例的剖面图；
图11为本发明背板的第六实施例的剖面图；以及
图12为本发明背板的第七实施例的剖面图。
 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，其为本发明显示装置的第一实施例的示意图。在本实施例中，背光模块100为侧向式入光的背光模块，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包括有背板110、至少一光源120、导光板130、反射层140及光学膜片150。背板110用于装设光源120、导光板130、反射层140及光学膜片150。光源120设置于导光板130的一侧，用以侧向发光至导光板130内，并由导光板130来导引出光。反射层140形成于背板110与导光板130之间，用以反射光源120的光线。光学膜片150设置于导光板130上，以改善光学效果。
请参照图2至图3，图2为本发明背板的第一实施例的仰视图，图3为本发明背板的第一实施例的剖面图。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具有相对的第一面111和第二面112，其中背板110包括多个凸部113，其形成于第二面112上，用以增加背板110的散热面积，改善背板110的散热效果。这些凸部113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，这些凸部113可为多个长条状凸部(如图2所示)。其中，至少部分的凸部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。
如图1所示，本实施例的光源120例如为冷阴极萤光灯管(Cold Cathode Fluorescent Lamp，CCFL)、发光二极管(Light Emitting Diode，LED)、有机发光二极管(Organic Light Emitting Diode，OLED)、电激发光组件(Electro-Luminescence，EL)、发光灯条(Light Bar)或上述的任意组合。
在一实施例中，光源120可例如为发光灯条，其可包括电路板和发光组件 (例如LED)，电路板例如为印刷电路板(Printed circuit board，PCB)或软性印刷电路板(Flexible Printed Circuits，FPC)，发光组件是设置电路板上。
如图1所示，本实施例的导光板130是利用射出成型(Injection Molding)的方式来制成，其材料为光硬化型树脂、聚甲基丙烯酸甲酯(PMMA)或聚碳酸酯(PC)，用以导引光源120的光线至液晶显示面板101。导光板130具有出光面131、光反射面132及侧入光面133。出光面131形成于导光板130的一侧，并面对液晶显示面板101，出光面131可具有雾面处理或散射点设计，以便均匀化导光板130的出光，减少出光不均(Mura)的现象。在另一实施例中，出光面131更可设有若干个突出结构(未绘示)，以便进一步修正光线的方向，来增加聚光效果，并提高正面辉度。其中此些突出结构可例如为：棱形或半圆形的凸起或凹陷结构等。光反射面132是形成导光板130相对出光面131的另一侧，用以反射光线至出光面131。在本实施例中，导光板130的光反射面132平行于出光面131。光反射面132可设有导光结构(未绘示)，以反射导引光线由出光面131射出。光反射面132的导光结构例如是呈连续性的V形结构，亦即V-Cut结构、雾面结构、散射点结构，以便导引光源120的光线充分的由出光面131射出。侧入光面133形成于导光板130的一侧或相对两侧，其对应于光源120，用以允许光源120所发出的光线可进入导光板130内。且此侧入光面133可具有例如V形结构(V-Cut)、S形波浪结构或表面粗糙化处理(未绘示)，以此提升光线的入射效率和光耦合效率。在本实施例中，此侧入光面133为一平面，其垂直于光反射面132。
如图1所示，本实施例的反射层140(或反射片)优选是形成导光板130的光反射面132的表面，而仅暴露出用以允许光线进入的侧入光面133以及用以发出光线的出光面131。反射层140可由高反射率材料所制成，例如银、铝、金、铬、铜、铟、铱、镍、铂、铼、铑、锡、钽、钨、锰、上述任意组合的合金、耐黄化且耐热的白色反射漆料或上述材料的任意组合，以反射光线。
如图1所示，本实施例的光学膜片150例如为：扩散片、棱镜片、逆棱镜片(Turning Prism Sheet)、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，其设置于导光板130上，用以改善由导光板130出光的光学效果。
如图1至图2所示，本实施例的背板110的凸部113的形成位置亦可依据光源120的位置来决定，亦即至少部分的凸部113是位于或靠近于光源120的下方，以有利于光源120的散热，并改善光源120的热量集中问题。在本实施例中，光源120可仅设置于导光板130的一侧，亦即位于背板110的一侧。此时，凸部113可形成于背板110的背面(第二面112)上，并排列于来靠近背板110的所述侧，以有利于光源120的散热，并可均匀化背板110的温度分布。
如图2至图3所示，本实施例的背板110的凸部113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，一般，具有光源设置于背板一侧的背光模块，其可能具有实质三角形的热量分布。因此，在本实施例中，凸部113可排列成一三角形，其对应于背板110的热量集中分布(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，凸部113亦可依据背光模块100的热量分布情形来排列成其它形状。
如图3所示，其显示依照本发明的第一实施例的背板的部分剖面图。在本实施例中，部分背板110是朝第二面112来弯曲(如图4及图5所示)，因而一体地形成这些凸部113于第二面112上。
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的位置设有多个凸部113，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。
请参照图4及图5，图4为本发明背光模块的第二实施例的示意图，图5为本发明背板的第二实施例的立体示意图。以下仅就本实施例与第一实施例间的相异处进行说明，而其相似处则在此不再赘述。第二实施例的背光模块200包括背板210、二光源220、导光板230、反射层240及光学膜片250。相较于第一实施例，第二实施例的光源220例如为发光灯条，其设置于背板210的相对的第一侧215和第二侧216，导光板230设于光源220之间。背板210具有相对的第一面211和第二面212，背板210包括多个凸部213，其形成于第二面212上，且分别靠近于背板210的第一侧215与第二侧216，用以增加背板210在第一侧215与第二侧216处的散热面积，以有利于光源220的散热。
请参照图6及图7，图6为本发明背光模块的第二实施例的温度分布图，图7为本发明背板的第二实施例的仰视图。再者，背板210的凸部213形成位置、排列形状、排列密度或数量可依据背板210的一温度分布图来决定，所述温度分布图是在凸部213形成于背板210之前所预先量测。此温度分布图可利用一温度侦测器来量测，用以表示背板210在形成凸部213之前的温度分布情形。例如，当显示装置为直立且为开启状态时，背板210的第一侧215与第二侧216是分别位于显示装置的上方及下方。此时，由背光模块200(背板210)的温度分布图可知，背板210的高温区域(如图6所示，高温区域的温度约为32℃以上)是分别靠近于第一侧215与第二侧216，且背光模块200的高温区域是近似于三角形。因此，背板210的凸部213可分别排列于第一侧215与第二侧216，且其排列形状是呈三角形。又，由于显示装置在直立时的上方处的散热效果较佳，因此，位于背板210的第一侧215(对应于显示装置的上方)的凸部213的排列面积、排列密度或数量可小于第二侧216(对应于显示装置的下方)的凸部213的排列面积、排列密度或数量。因此，凸部213可预先依据背板210的所预先量测的温度分布图来配置，以均匀背光模块200的散热，进而确保显示装置的显示质量。
请参照图8，其为本发明背光模块的第三实施例的部分剖面图。第三实施例的背光模块可为直下式入光式背光模块，此时，光源320例如为多个发光灯条，其散布地排列于背板310的第一面311上，而背板310的凸部313形成于第二面312上，并位于光源320之间，且凸部313优选至少形成于背板310的中间位置，以避免光源320的热量集中于背板310的中间位置，而可均匀化背光模块的温度分布。因此，背板310的凸部313可改善散热效果，以确保显示装置的显示质量。
请参照图9，其为本发明背板的第四实施例的仰视图。背板410的这些凸部413可为多个散布点状凸部，其可排列成一三角形来对应于背板410的热量集中分布，以提高背板410的中间部分的散热面积，因而可对应地改善背板410的散热效果，并可均匀化背板410的温度分布。
请参照图10，其为本发明背板的第五实施例的剖面图。相较于在背板510的两侧，这些凸部513在背板510的中间部分处可具较高的排列密度，亦即在背板510的中间部分处设有较多的凸部513，或者在背板510的中间部分处的凸部513之间的间距较小，以提高背板510的中间部分的散热面积，而可改善热量集中的情形。
请参照图11，其为本发明背板的第六实施例的剖面图。在第六实施例中，部分的背板610可突出于第二面612上，因而一体形成这些凸部613。
请参照图12，其为本发明背板的第七实施例的剖面图。在第七实施例中，这些凸部713亦可利用一导热胶714来贴合于背板710的第二面712上。
由上述可知，本发明的背光模块和显示装置可通过背板的凸部来增加散热面积，且凸部的配置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，改善光源的热量集中问题。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。
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
工业实用性
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Claims (20)

  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凸部，其形成于所述第二面上；以及
    光源，设置于所述背板的所述第一面上；
    其中，至少部分的所述凸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凸部形成于所述背板之前所预先量测, 所述高温区域内的温度是大于中间温度，所述中间温度为所述背板的最高温度与最低温度的平均。
  2. 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凸部，其形成于所述第二面上；以及
    光源，设置于所述背板的所述第一面上；
    其中，至少部分的所述凸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凸部形成于所述背板之前所预先量测。
  3. 根据权利要求2所述的背光模块，其中所述凸部为多个长条状凸部。
  4. 根据权利要求2所述的背光模块，其中所述凸部为多个散布点状凸部。
  5. 根据权利要求2所述的背光模块，还包括导光板，设置于所述背板上，所述光源设置于所述导光板的一侧，所述凸部排列于所述背板的所述侧，且所述凸部的排列形状为三角形。
  6. 根据权利要求2所述的背光模块，还包括导光板，设置于所述背板上，所述光源设置于所述背板的相对的第一侧和第二侧，所述凸部排列于所述背板的所述第一侧与所述第二侧，且所述凸部的排列形状为三角形。
  7. 根据权利要求6所述的背光模块，其中位于所述背板的所述第一侧的所述凸部的排列面积、排列密度或数量是小于所述第二侧的所述凸部的排列面积、排列密度或数量。
  8. 根据权利要求2所述的背光模块，其中所述凸部的剖面形状为圆弧形、三角形或矩形。
  9. 根据权利要求2所述的背光模块，其中相较于在所述背板的两侧，所述凸部在所述背板的中间部分处具较高的排列密度。
  10. 根据权利要求2所述的背光模块，其中所述光源散布地排列于所述背板的所述第一面上，所述凸部是至少形成于所述背板的中间位置。
  11. 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凸部，其形成于所述第二面上；以及
    光源，设置于所述背板的所述第一面上；
    其中，至少部分的所述凸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凸部形成于所述背板之前所预先量测。
  12. 根据权利要求11所述的显示装置，其中所述凸部为多个长条状凸部。
  13. 根据权利要求11所述的显示装置，其中所述凸部为多个散布点状凸部。
  14. 根据权利要求11所述的显示装置，还包括导光板，设置于所述背板上，所述光源设置于所述导光板的一侧，所述凸部排列于所述背板的所述侧，且所述凸部的排列形状为三角形。
  15. 根据权利要求11所述的显示装置，还包括导光板，设置于所述背板上，所述光源设置于所述背板的相对的第一侧和第二侧，所述凸部排列于所述背板的所述第一侧与所述第二侧，且所述凸部的排列形状为三角形。
  16. 根据权利要求15所述的显示装置，其中位于所述背板的所述第一侧的所述凸部的排列面积、排列密度或数量是小于所述第二侧的所述凸部的排列面积、排列密度或数量。
  17. 根据权利要求11所述的显示装置，其中所述凸部的剖面形状为圆弧形、三角形或矩形。
  18. 根据权利要求11所述的显示装置，其中相较于在所述背板的两侧，所述凸部在所述背板的中间部分处具较高的排列密度。
  19. 根据权利要求11所述的显示装置，其中所述光源散布地排列于所述背板的所述第一面上，所述凸部是至少形成于所述背板的中间位置。
  20. 根据权利要求11所述的显示装置，其中所述凸部是一体地形成于所述第二面上。
PCT/CN2011/073023 2011-03-31 2011-04-19 背光模块及显示装置 WO2012129824A1 (zh)

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