WO2017049605A1 - 背光模组 - Google Patents

背光模组 Download PDF

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Publication number
WO2017049605A1
WO2017049605A1 PCT/CN2015/090767 CN2015090767W WO2017049605A1 WO 2017049605 A1 WO2017049605 A1 WO 2017049605A1 CN 2015090767 W CN2015090767 W CN 2015090767W WO 2017049605 A1 WO2017049605 A1 WO 2017049605A1
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WO
WIPO (PCT)
Prior art keywords
backlight module
light guide
adjacent
backlight
sheet
Prior art date
Application number
PCT/CN2015/090767
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English (en)
French (fr)
Inventor
樊勇
Original Assignee
深圳市华星光电技术有限公司
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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 US14/785,610 priority Critical patent/US20170153497A1/en
Publication of WO2017049605A1 publication Critical patent/WO2017049605A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/133602—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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module.
  • TFT-LCD Thin Film Transistor-Liquid Crystal Display
  • an external light source is required for display, and usually such a light source is backlit.
  • the light source type has undergone an iterative development from a CCFL (Cold Cathode Fluorescent Lamp) to an LED (Light-Emitting Diode) source. LEDs have become the mainstream of backlights due to their small size, fast response time, long life, non-breaking, high color gamut and many types of packages.
  • CCFL Cold Cathode Fluorescent Lamp
  • LED Light-Emitting Diode
  • the current basic can be divided into two types of backlights such as an optical LED backlight and a direct-lit LED backlight.
  • the side-entry backlight has the advantages of low power consumption and thin thickness, but it needs to be used together with the light guide plate, the weight is heavy, and the manufacturing cost is high.
  • the direct type backlight has a relatively low cost due to the small number of light sources (with prisms) and no light guide plate, but is relatively thick due to the relatively high light box.
  • the QD (quantum dot) phosphor has a narrow full-width at half maximum (full width at half maximum), only 20 to 40 nm, and has a very high color purity, which is the highest color saturation in phosphors. Phosphors.
  • the QD phosphor is synthesized by chemical solution, and it is difficult to disperse evenly with silica gel, and it is afraid of water and oxygen, and the temperature quenching is serious. If it is directly packaged in the LED, the luminance is low and the signal resistance is poor. produce. At present, QD phosphors can be mass-produced by using a remote phosphor solution.
  • QDEF quantum dot film
  • 3M Company which uses a sandwich structure to package QD as optical.
  • QD tube the "QD tube” product represented by QD Vision, which uses QD powder in a glass tube and uses “QD tube” when used. Place it on the front of the LED and secure the “QD tube” with the support.
  • QD film is limited by the machine, no The method is more than the oversized (100inch or more) wide, which limits its application in oversized products. Since the "QD tube” can only be used for the side entry type, the glass tube is difficult to assemble due to bending and is easily broken. In addition, since the size of the light guide plate is limited in the application of the oversized product, the maximum size is only 98 inches. For various reasons, it is difficult to achieve the application of QD technology in oversize by conventional optical design methods.
  • the present invention provides a backlight module that is low in manufacturing cost and easy to implement.
  • a backlight module includes a top open back plate, a first reflective sheet disposed on a bottom surface of the back plate, a plurality of light guide plates spaced apart from the first reflective sheet, a backlight assembly, and a back cover An optical film set at a top surface of the board, the backlight assembly comprising a wedge-shaped heat sink and a light source fixed on two inclined surfaces adjacent to the heat sink, the backlight assembly being disposed on two adjacent blocks Within the gap between the light guide plates.
  • the opposite faces of the two adjacent light guide plates are respectively parallel to the two inclined faces adjacent to the heat sink, and are at an acute angle with the top surface of the light guide plate.
  • the adjacent two light guide plates have the same angle with the top surface thereof.
  • the light source is an LED or a quantum tube.
  • the backlight module further includes a diffusion plate disposed between the optical film group and the back plate.
  • the backlight module further includes a support column fixed on the light guide plate, and the support column is used to support the diffusion plate.
  • the backlight module further includes a dot diffusion film that is attached between the two adjacent light guide plates and covers the gap.
  • the sidewall of the backboard includes a first portion adjacent to the bottom surface of the back panel and a second portion folded outwardly from the first portion, the first portion and the inner surface of the second portion are both A second reflective sheet is attached.
  • an angle between the portion of the second reflection sheet that is bonded to the first portion and the bottom surface of the back sheet is not more than 90°.
  • a height of a portion of the second reflection sheet that is bonded to the first portion with respect to a bottom surface of the back sheet is greater than a thickness of the light guide plate.
  • the first reflective sheet on the bottom surface of the back panel of the backlight module of the present invention is provided with a plurality of light guide plates spaced apart from each other, and the light source is disposed at the gap between the adjacent two light guide plates, thereby greatly reducing the width and thickness of the backlight module.
  • the backlight module can be better applied to a large-sized display device, and the QD technology can also realize the application of the QD technology in an oversized size, and can also effectively reduce the number of light sources and reduce the manufacturing cost;
  • the side wall adjacent to the bottom surface of the back plate is attached with a reflection sheet, and is reasonablely By designing the height and the tilt angle of the reflective sheet, the defects of the dark band around the conventional backlight module can be effectively eliminated.
  • FIG. 1 is a partial schematic structural view of a backlight module according to Embodiment 1 of the present invention.
  • FIG. 2 is a cross-sectional structural view of a backlight module according to Embodiment 1 of the present invention.
  • FIG. 3 is a cross-sectional structural view of a backlight module according to Embodiment 2 of the present invention.
  • the present invention provides a backlight module, including a back panel 10 having a top opening, a first reflection sheet 20a disposed on a bottom surface of the back panel 10, and a spacer disposed on the first reflection sheet 20a. a plurality of light guide plates 30, a backlight assembly 40, and an optical film set 50 disposed at a top surface opening of the back plate 10.
  • the backlight assembly 40 includes a wedge-shaped heat sink 41 and a light source 42 fixed on two adjacent inclined faces.
  • the backlight assembly 40 is disposed in the gap G between the adjacent two light guide plates 30.
  • the back plate 10 of the embodiment has a horn shape, and the bottom surface and the side wall of the back plate are respectively attached with the first reflective sheet 20a and the second reflective sheet 20b, and the sidewall of the peripheral light guide plate 30 is closely attached to the second reflective sheet.
  • the inner surface of 20b, and the end faces of the adjacent two light guide plates 30 are separated by a distance.
  • the point light sources 42 of the backlight assembly 40 are arranged in a row in the gap G between each two adjacent two light guide plates 30.
  • the heat sink 41 has an isosceles triangle and two adjacent ones.
  • Light guide plate 30 The end faces are all inclined, and the two inclined faces adjacent to the heat sink 41 are parallel, and the angle between the two inclined faces and the top surface of the light guide plate 30 is 45° acute.
  • the light source 42 is an LED or a quantum tube, and the light emitted by the light source 42 can be incident perpendicularly into the light guide plate 30.
  • the heat dissipation frame 41 in each gap G of the present embodiment is integrally formed or a plurality of independent individuals spaced apart along the length direction of the gap G.
  • a diffusion plate 60 is attached to the opening of the back plate 10, and the diffusion plate 60 is attached to the back surface of the optical film group 50.
  • the upper surface of the light guide plate 30 is fixed with a plurality of spaced-apart support columns 70 which are perpendicular to the light guide plate 30 and extend to the opening of the back plate 10, and the ends thereof are spaced apart from the diffusion plate 60 for The diffusion plate 60 is supported to prevent the diffusion plate 60 from being deformed.
  • a dot diffusion film 80 is attached between the adjacent two light guide plates 30, and the dots are attached.
  • the surface of the diffusion film 80 is provided with a plurality of scattering mesh points for scattering, and is located above the light source 42 and covers the gap G.
  • the light emitted from the top of the light source 42 is uniformly emitted after being homogenized by the dot diffusion film 80, thereby avoiding the light guide plate 30.
  • the excessive brightness at the gap G between them affects the backlight effect, so that the light mixing distance (the distance between the light guide plate 30 and the diffusion plate 60) can be reduced.
  • the side wall of the back sheet 10 of the present embodiment and the second reflection sheet 20b bonded to the side wall are different in structure.
  • the sidewall of the back plate 10 of the embodiment is formed to be opposite to the bottom surface of the back plate 10.
  • the first portion 11 of the adjacent portion and the second portion 12 of the bell-shaped portion that is folded outwardly from the first portion, the inner surfaces of the first portion 11 and the second portion 12 are respectively fitted with the second reflective sheet 20b.
  • the two reflective sheets 20b have the same shape as the side walls of the back sheet 10, and the angle ⁇ between the portion where the second reflection sheet 20b is bonded to the first portion 11 and the bottom surface of the back sheet 10 is not more than 90°, and the second reflection sheet 20b
  • the portion of the second portion 11 that is in contact with the first portion 11 is larger than the thickness of the light guide plate 30, and the portion of the second reflection sheet 20b that is in contact with the first portion 11 is spaced apart from the light guide plate 30 by a distance.
  • the portion of the second reflection sheet 20b to be bonded to the first portion 11 is higher than the thickness of the light guide plate 30 by 2 mm or more with respect to the height of the bottom surface of the back sheet 10.
  • the portion of the light guide plate 30 that is incident on the second reflection sheet 20b and the first portion 11 does not protrude toward the light exit surface, thereby avoiding the occurrence of bright and dark bands around the backlight module caused by the conventional reflection sheet. problem.
  • the invention effectively reduces the width and thickness of the backlight module, and is advantageous for the narrow frame and the ultra-thin design.
  • the backlight module can be better applied to a large-sized display device, and the QD technology can also realize the application of the QD technology in an oversized size, and can also effectively reduce the number of light sources and reduce the manufacturing cost;
  • the side wall adjacent to the bottom surface of the back plate is attached with a reflection sheet, and is reasonablely

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

Abstract

一种背光模组，包括顶面开口的背板（10）、设于背板（10）底面上的第一反射片（20a）、间隔设于第一反射片（20a）上的多块导光板（30）、背光源组件（40）和设于背板（10）顶面开口处的光学膜片组（50），背光源组件（40）包括楔形的散热器（41）和固定在散热器（41）相邻的两个斜面上的光源（42），背光源组件（40）设于相邻的两块导光板（30）之间的间隙（G）内。背光模组有利于窄边框和超薄化设计，降低了制造成本；背光一致性好，有利于减小混光距离；还可有效消除传统背光模组中四周出现量暗带的缺陷。

Description

背光模组 技术领域
本发明涉及显示技术领域，尤其涉及一种背光模组。
背景技术
在传统的TFT-LCD(Thin Film Transistor-Liquid Crystal Display，即薄膜场效应晶体管液晶显示器)中，由于TFT-LCD面板本身并不发光，需要借助外加光源才能进行显示，通常这样的光源有背光式光源和反射式光源两种，由于背光式光源的发光受环境因素的变化影响非常小，所以目前的TFT-LCD显示器中的光源几乎都为背光式光源。
在TFT-LCD背光式光源中，光源类型经历了从CCFL(Cold Cathode Fluorescent Lamp，即冷阴极荧光灯管)到LED(Light-Emitting Diode，即发光二极管)光源的迭代发展。由于LED具有体积小，响应时间快、寿命长、不易碎、色域高、封装体种类多等优点，目前已成为背光源的主流。
在LED背光中，目前基本可以分为侧如光式LED背光和直下式LED背光两种背光形式。侧入式背光具有功耗小、厚度薄等优点，但由于需要与导光板配合使用，重量较重，制造成本较高。而直下式背光由于使用光源数目少(带棱镜)、无导光板，因此成本相对较低，但是由于灯箱相对较高，外观上较厚。
QD(quantum dot，即量子点)荧光粉由于发光光谱FWHM(full width at half maximum，半峰宽)窄，仅20～40nm，颜色色纯度极高，是目前荧光粉中可实现色彩饱和度最高的荧光粉。但QD荧光粉由于采用化学溶液方式合成，和硅胶较难分散均匀，且怕水怕氧、发光方面温度淬灭严重，如果直接封装在LED中，发光亮度低，信耐性差，目前无法实现批量生产。目前QD荧光粉可以量产应用的方法皆为采用远程荧光粉方案，其中具有代表性的一种是以3M公司为代表的量子点薄膜“QDEF”产品，即采用夹层结构，把QD封装如光学膜片中，使用时和其他光学膜片搭配使用；另一种是以QD vision公司为代表的“QD tube”产品，该产品采用把QD粉封装如玻璃管中，使用时把“QD tube”放在LED前面，并用支撑装置固定“QD tube”即可。但目前由于QD膜受到机台限制，无 法做到超过超大尺寸(100inch以上)的宽幅，限制了其在超大尺寸产品上的应用。“QD tube”由于仅能用于侧入式，由于玻璃管弯曲后组装困难且极易破损，此外，在超大尺寸产品应用方面由于导光板尺寸受到限制，目前最大仅能做到98inch。基于各种原因，目前采用常规的光学设计手段很难实现QD技术在超大尺寸上的应用。
发明内容
鉴于现有技术存在的不足，本发明提供了一种制造成本低、易于实现的背光模组。
为了实现上述的目的，本发明采用了如下的技术方案：
一种背光模组，包括顶面开口的背板、设于所述背板底面上的第一反射片、间隔设于所述第一反射片上的多块导光板、背光源组件和设于背板顶面开口处的光学膜片组，所述背光源组件包括楔形的散热器和固定在所述散热器相邻的两个斜面上的光源，所述背光源组件设于相邻的两块所述导光板之间的间隙内。
进一步地，相邻的两个所述导光板相对的面分别与所述散热器相邻的两个斜面平行，且与所述导光板的顶面夹角均呈锐角。
进一步地，相邻的两个所述导光板与其顶面的夹角相同。
进一步地，所述光源为LED或量子管。
进一步地，所述的背光模组还包括扩散板，所述扩散板设于所述光学膜片组和所述背板之间。
进一步地，所述的背光模组还包括固定于所述导光板上的支撑柱，所述支撑柱用于支撑所述扩散板。
进一步地，所述的背光模组还包括贴付于相邻的两块所述导光板之间并覆盖所述间隙的网点扩散膜。
进一步地，所述背板的侧壁包括与所述背板底面相邻的第一部分和自所述第一部分朝外翻折的第二部分，所述第一部分和所述第二部分内表面均贴合有第二反射片。
进一步地，所述第二反射片与所述第一部分贴合的部分与所述背板底面之间的夹角不大于90°。
进一步地，所述第二反射片与所述第一部分贴合的部分相对于所述背板底面的高度大于所述导光板的厚度。
本发明的背光模组的背板底面的第一反射片上间隔布置有多块导光板，并将光源设于相邻的两块导光板的间隙处，大幅减少了背光模组的宽度和厚度，使得背光模组能够更好地应用在大尺寸的显示装置中，与QD技术结合还能实现QD技术在超大尺寸上的应用，还可以有效减少光源的数量，降低制造成本；同时，光源上方设有网点扩散膜，光学膜片组底部贴付有扩散板，背光一致性好，且有利于减小混光距离；背板上与其底面相邻的侧壁部分贴付有反射片，并通过合理设计该反射片的高度和倾斜角度，可以有效消除传统背光模组中四周出现量暗带的缺陷。
附图说明
图1为本发明实施例1的背光模组的部分结构示意图。
图2为本发明实施例1的背光模组的剖视结构示意图。
图3为本发明实施例2的背光模组的剖视结构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例1
参阅图1和图2，本发明设计了一种背光模组，包括顶面开口的背板10、设于背板10底面上的第一反射片20a、间隔设于第一反射片20a上的多块导光板30、背光源组件40和设于背板10顶面开口处的光学膜片组50，背光源组件40包括楔形的散热器41和固定在相邻的两个斜面上的光源42，背光源组件40设于相邻的两块导光板30之间的间隙G内。本实施例的背板10为喇叭形，背板的底面和侧壁分别贴合有第一反射片20a和第二反射片20b，位于外围的导光板30的侧壁紧贴在第二反射片20b内表面，且相邻的两个导光板30的端面隔开一段距离。
背光源组件40的点光源42成排布置于每两个相邻的两块导光板30之间的间隙G内，本实施例中，散热器41的截面为等腰三角形，相邻的两个导光板30 的端面均为斜面，分别与散热器41相邻的两个斜面平行，且两斜面与导光板30顶面的夹角均呈45°锐角。这样，经过背光源组件40朝两侧的导光板30发出的光线一致，均匀性高。光源42为LED或者量子管，光源42发出的光可垂直射入导光板30内。本实施例的每个间隙G内的散热架41一体成型或为多个沿间隙G的长度方向间隔设置的独立的个体。
在背板10的开口处安装有一层扩散板60，扩散板60贴合于光学膜片组50的背面。导光板30的上表面固定有多根间隔设置的支撑柱70，这些支撑柱70垂直于导光板30，并延伸至背板10的开口，其端部与扩散板60隔开一定距离，用于支撑扩散板60，防止扩散板60变形。
另外，由于两块导光板30的拼接处容易出现亮度较亮、入光面边缘较厚的情况，本实施例在相邻的两块导光板30之间贴付有网点扩散膜80，该网点扩散膜80表面设有多个起到散射作用的散射网点，位于光源42上方并覆盖间隙G，光源42顶部发出的光线经过该网点扩散膜80匀光后可均匀射出，避免了导光板30之间的间隙G处亮度过高影响背光效果，从而可以缩小混光距离(导光板30到扩散板60的距离)。
实施例2
如图3所示，与实施例1不同的是，本实施例的背板10的侧壁以及与该侧壁贴合的第二反射片20b结构不同。
由于当混光距离缩小到一定程度，如小于20mm时，容易在背光模组四周出现亮、暗带，为改善光学品味，本实施例的背板10的侧壁形成为与背板10底面相邻的第一部分11和自第一部分朝外翻折的喇叭口形的第二部分12，第一部分11和第二部分12内表面均贴合有第二反射片20b，在一种实施方式中，第二反射片20b与背板10的侧壁形状一致，且第二反射片20b与第一部分11贴合的部分与背板10底面之间的夹角α不大于90°，且第二反射片20b与第一部分11贴合的部分相对于背板10底面的高度大于导光板30的厚度，第二反射片20b与第一部分11贴合的部分与导光板30隔开一段距离。进一步地，第二反射片20b与第一部分11贴合的部分相对于背板10底面的高度比导光板30的厚度尺寸高出2mm以上为宜。通过这样的设置，导光板30上射入到第二反射片20b与第一部分11贴合的部分后不会朝向出光面射出，避免了传统反射片引起的背光模组四周出现亮、暗带的问题。
本发明有效地减少了背光模组的宽度和厚度，有利于窄边框和超薄化设计， 使得背光模组能够更好地应用在大尺寸的显示装置中，与QD技术结合还能实现QD技术在超大尺寸上的应用，还可以有效减少光源的数量，降低制造成本；同时，光源上方设有网点扩散膜，光学膜片组底部贴付有扩散板，背光一致性好，且有利于减小混光距离；背板上与其底面相邻的侧壁部分贴付有反射片，并通过合理设计该反射片的高度和倾斜角度，可以有效消除传统背光模组中四周出现量暗带的缺陷。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (20)

  1. 一种背光模组，其中，包括顶面开口的背板、设于所述背板底面上的第一反射片、间隔设于所述第一反射片上的多块导光板、背光源组件和设于背板顶面开口处的光学膜片组，所述背光源组件包括楔形的散热器和固定在所述散热器相邻的两个斜面上的光源，所述背光源组件设于相邻的两块所述导光板之间的间隙内。
  2. 根据权利要求1所述的背光模组，其中，相邻的两个所述导光板相对的面分别与所述散热器相邻的两个斜面平行，且与所述导光板的顶面夹角均呈锐角。
  3. 根据权利要求2所述的背光模组，其中，相邻的两个所述导光板与其顶面的夹角相同。
  4. 根据权利要求1所述的背光模组，其中，所述光源为LED或量子管。
  5. 根据权利要求1所述的背光模组，其中，还包括扩散板，所述扩散板设于所述光学膜片组和所述背板之间。
  6. 根据权利要求5所述的背光模组，其中，还包括固定于所述导光板上的支撑柱，所述支撑柱用于支撑所述扩散板。
  7. 根据权利要求1所述的背光模组，其中，还包括贴付于相邻的两块所述导光板之间并覆盖所述间隙的网点扩散膜。
  8. 根据权利要求1所述的背光模组，其中，所述背板的侧壁包括与所述背板底面相邻的第一部分和自所述第一部分朝外翻折的第二部分，所述第一部分和所述第二部分内表面均贴合有第二反射片。
  9. 根据权利要求8所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分与所述背板底面之间的夹角不大于90°。
  10. 根据权利要求8所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分相对于所述背板底面的高度大于所述导光板的厚度。
  11. 根据权利要求2所述的背光模组，其中，所述背板的侧壁包括与所述背板底面相邻的第一部分和自所述第一部分朝外翻折的第二部分，所述第一部分和所述第二部分内表面均贴合有第二反射片。
  12. 根据权利要求11所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分与所述背板底面之间的夹角不大于90°。
  13. 根据权利要求11所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分相对于所述背板底面的高度大于所述导光板的厚度。
  14. 根据权利要求3所述的背光模组，其中，所述背板的侧壁包括与所述背板底面相邻的第一部分和自所述第一部分朝外翻折的第二部分，所述第一部分和所述第二部分内表面均贴合有第二反射片。
  15. 根据权利要求14所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分与所述背板底面之间的夹角不大于90°。
  16. 根据权利要求14所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分相对于所述背板底面的高度大于所述导光板的厚度。
  17. 根据权利要求7所述的背光模组，其中，所述背板的侧壁包括与所述背板底面相邻的第一部分和自所述第一部分朝外翻折的第二部分，所述第一部分和所述第二部分内表面均贴合有第二反射片。
  18. 根据权利要求17所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分与所述背板底面之间的夹角不大于90°。
  19. 根据权利要求17所述的背光模组，其中，所述第二反射片与所述第一部分贴合的部分相对于所述背板底面的高度大于所述导光板的厚度。
  20. 一种背光模组，其中，包括顶面开口的背板、设于所述背板底面上的第一反射片、间隔设于所述第一反射片上的多块导光板、背光源组件、设于所述背板顶面开口处的光学膜片组以及网点扩散膜，所述背光源组件包括楔形的散热器和固定在所述散热器相邻的两个斜面上的光源，所述背光源组件设于相邻的两块所述导光板之间的间隙内，所述网点扩散膜贴付于相邻的两块所述导光板之间并覆盖所述间隙。
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