WO2017071030A1 - 背光单元、背光模组、背光模组及显示装置 - Google Patents

背光单元、背光模组、背光模组及显示装置 Download PDF

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Publication number
WO2017071030A1
WO2017071030A1 PCT/CN2015/098336 CN2015098336W WO2017071030A1 WO 2017071030 A1 WO2017071030 A1 WO 2017071030A1 CN 2015098336 W CN2015098336 W CN 2015098336W WO 2017071030 A1 WO2017071030 A1 WO 2017071030A1
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Prior art keywords
light
plate
disposed
backlight
backlight module
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Ceased
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PCT/CN2015/098336
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English (en)
French (fr)
Inventor
樊勇
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/905,263 priority Critical patent/US20170227817A1/en
Publication of WO2017071030A1 publication Critical patent/WO2017071030A1/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
    • G02F1/133605—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
    • G02B6/0013—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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • 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
    • 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
    • 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
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in 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
    • G02F1/133606—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
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a backlight unit, a backlight module, a backlight module, and a display device.
  • Liquid crystal displays are the mainstream display device technology on the market today.
  • the display device requires a backlight to illuminate the liquid crystal display as a light source.
  • the conventional backlight module is mainly divided into a direct type backlight and a side-in type backlight.
  • a side-lit backlight requires a light guide plate, and the larger the size of the light guide plate, the higher the cost.
  • the straight-down type is thicker.
  • it is mainly realized by increasing the number of lamps or increasing the light distribution of the LED lens. By adopting these two methods, the cost is higher in the case of large size.
  • the invention provides a backlight unit and a backlight module, so as to realize the purpose of thinning the backlight module and saving cost.
  • the invention also provides a display device.
  • the backlight unit provided by the present invention comprises a main reflection sheet, a light guide plate disposed on the reflection surface of the main reflection sheet, a light source and a sub-reflection sheet;
  • the light guide plate includes a light-emitting surface and a groove located at a middle portion of the light-emitting surface.
  • the light source is disposed in the groove, the secondary reflection sheet is mounted on the light emitting surface and covers the groove, and the reflective surface of the secondary reflection sheet faces the light source.
  • the backlight module includes a back plate, a plurality of backlight units, and a diffusion plate, and the back plate forms a receiving slot.
  • the backlight unit includes a main reflection sheet, a light guide plate disposed on a reflective surface of the main reflection sheet, a light source and a sub-reflection sheet; the light guide plate includes a light-emitting surface and a groove located at a middle portion of the light-emitting surface, the lamp
  • the source is disposed in the recess
  • the sub-reflective sheet is mounted on the light-emitting surface and covers the recess, and the reflective surface of the sub-reflective sheet faces the light source;
  • the plurality of backlight units are arranged at intervals The bottom surface of the receiving groove, the diffusing plate closes the receiving groove and is disposed opposite to the light emitting surface.
  • the plurality of backlight units are arranged in a matrix, and a support body is disposed between each of the two backlight units, and the opposite ends of the support body respectively abut the bottom surface and the diffusion plate.
  • the backlight unit further includes a heat sink disposed on a surface of the main reflective sheet facing the bottom surface and opposite to a position of the light source.
  • the reflectance of the secondary reflection sheet is greater than the reflectance of the primary reflection sheet.
  • the groove penetrates the light guide plate, and the light source is installed in the groove on the main reflection sheet.
  • the backing plate includes a bottom plate and a side plate disposed on a periphery of the bottom plate, and the side plate and the bottom plate together define the receiving groove, and a surface of the bottom plate located in the receiving groove is the bottom surface.
  • the side panel includes a connecting section and a beveled edge extending from the connecting section, the connecting section is connected to the bottom board, the inclined surface connects the connecting section and the diffusing plate, and the connecting section and the oblique side are oriented
  • the surface of the receiving groove is provided with a side reflection sheet.
  • the backlight module further includes an optical film, and the optical film is disposed on a surface of the diffusing plate in a light emitting direction.
  • the light source is a CSP package LED lamp.
  • the present invention further provides a display device comprising the backlight module and the liquid crystal panel, wherein the liquid crystal panel is mounted on the backlight module opposite to the light emitting surface of the light guide plate.
  • the backlight module of the present invention provides a light source by a plurality of independent backlight units, each of which uses a separate light guide plate for a single light source, and is fully utilized on the material of the light guide plate to ensure light distribution without increasing
  • the light-expanding lens saves back-thickness and saves cost compared to using an integral light guide.
  • FIG. 1 is a schematic structural view of a backlight unit of a backlight module in a preferred embodiment of the present invention.
  • FIG. 2 is a schematic view showing a cross section of the entire structure of a backlight module of the present invention.
  • FIG 3 is a schematic cross-sectional view of a display device having a backlight module of the present invention.
  • a backlight unit and a backlight module 10 are used as a light source of a backlight module, and the backlight module is used to provide a light source for a display device in a display device.
  • the backlight module 10 is of a direct type, and includes a back plate 11 , a plurality of backlight units 13 , and a diffusion plate 15 .
  • the backing plate 11 forms a receiving groove 12.
  • the backlight unit 13 includes a main reflection sheet 131, a light guide plate 132 provided on a reflection surface of the main reflection sheet 131, a light source 133, and a sub-reflection sheet 134.
  • the light guide plate 132 includes a light emitting surface 135 and a groove 136 located at a middle portion of the light emitting surface.
  • the light source 133 is disposed in the groove 136.
  • the sub-reflecting sheet 134 is mounted on the light-emitting surface 135 and covers the groove 136.
  • the reflecting surface of the secondary reflection sheet 134 faces the light source 133.
  • the plurality of backlight units 13 are arranged at intervals on the bottom surface 121 of the accommodating groove 12, and the diffusion plate 15 closes the accommodating groove 12 and is disposed opposite to the light-emitting surface 135.
  • the backlight module 10 is provided with a plurality of independent backlight units, and each backlight unit uses a separate light guide plate 132 for a single light source 133, and is fully utilized on the light guide plate material to ensure light distribution without Increasing the light enlargement lens saves the overall space and thickness of the backplane; and for a large-size backlight module, it is more cost effective than using an integral light guide plate.
  • the light source 133 is a CSP packaged LED lamp, which has a large power and can emit light on five sides.
  • the light source cost can be reduced by the cooperation with the backlight unit 13, and the overall cost does not need to be increased.
  • the thickness of the backing plate ensures sufficient light source efficiency.
  • the back plate 11 includes a bottom plate 111 and a side plate 112 disposed on a periphery of the bottom plate 111.
  • the side plate 112 and the bottom plate 111 together define the receiving groove 12, and the surface of the bottom plate 111 located in the receiving groove 12 is the bottom surface 121.
  • the side plate 112 includes a connecting portion 114 and a beveled edge 115 extending from the connecting portion 114, and the connecting portion 114 is connected to the bottom plate 111,
  • the inclined surface 115 connects the connecting portion 114 and the diffusion plate 15, and the connecting portion 114 and the oblique side 115 are provided with a side reflection sheet 116 toward the surface of the receiving groove 12.
  • the side reflection sheet 116 can avoid the phenomenon that a bright band or a dark frame appears at the side position of the back plate 11.
  • the receiving groove 12 is substantially rectangular, and the periphery of the diffusing plate 15 abuts the side plate 112 to close the receiving groove 12, and the diffusing plate 15 is used to break the light flux and let the light Uniform distribution also controls the angle of exit.
  • An optical film 16 is further superposed on the surface of the diffusing plate 15 in the light emitting direction. The optical film 16 is used to uniformly diffuse the incident light source into a divergent light source, so that the light becomes very uniform and can solve the problem of the spot generated by the optical module.
  • the plurality of backlight units 13 are arranged in a matrix, and a support body 14 is disposed between each of the two backlight units 13.
  • the opposite ends of the support body 14 respectively abut the bottom surface 121 and the diffusion plate 15 .
  • the support body 14 supports the diffusion plate 15 to maintain a certain light mixing distance between the backlight unit 13 and the diffusion plate 15 and to prevent the diffusion plate 15 from collapsing.
  • the main reflection sheet 131 is placed on the bottom surface 121 of the accommodating groove 12, the reflection surface of the main reflection sheet 131 faces the light source 133, and the sub-reflection sheet 134 is located at the light guide plate 132.
  • the reflection surface 1341 of the sub-reflecting sheet 134 faces the light source 133.
  • the groove 136 extends through the light guide plate 132, and the light source 133 is mounted on the main reflection sheet 131 in the groove 136.
  • the two opposite sidewalls 137, the main reflective sheet 131 and the secondary reflective sheet 134 of the recess 136 together define a space, and the light source 133 is located in the space.
  • the reflectance of the secondary reflection sheet 134 is greater than the reflectance of the primary reflection sheet 141.
  • the backlight module light source 133 When the backlight module light source 133 is illuminated, the light portion of the light source 133 enters the light guide plate 132 through the two opposite sidewalls 137 of the recess 136, and passes through the light exit surface of the light guide plate 132. 135 is emitted, and finally, after the diffusion plate 15 and the optical film 16 act, the backlight module is emitted; and the light source 133 and some of the light are reflected by the main reflection sheet 131 and the sub-reflection sheet 134, and then enter the light guide plate 132. Then, it is emitted through the light-emitting surface 135 of the light guide plate 132, and the light of the light source 133 is fully utilized.
  • the backlight unit 13 further includes a heat sink 138 disposed on a surface of the main reflection sheet 131 facing the bottom surface 121 and opposite to the position of the light source 133, and the light source can be realized.
  • the heat dissipation of the source 133 is not limited to the above-detain.
  • the present invention further provides a display device including the backlight module 10 and
  • the liquid crystal panel 20 is mounted on the backlight module 10 and disposed opposite to the light emitting surface of the light guide plate 132.
  • the light source is transmitted through the optical film 16 to provide a light source to the liquid crystal panel 20, thereby realizing picture display.

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

Abstract

一种背光模组（10）及显示装置，所述背光模组（10）包括背板（11）、数个背光单元（13）及扩散板（15），所述背板（11）形成容纳槽（12），所述背光单元（13）包括主反射片（131）、设于所述主反射片（131）的反射面上的导光板（132）、灯源（133）及副反射片（134）；所述导光板（132）包括出光面（135）及位于出光面（135）中部的凹槽（136），所述灯源（133）设于凹槽（136）内，所述副反射片（134）装于所述出光面（135）上并遮盖所述凹槽（136），所述副反射片（134）的反射面（1341）朝向所述灯源（133）；所述数个背光单元（13）间隔排列于所述容纳槽（12）的底面（121），所述扩散板（15）封闭所述容纳槽（12）与所述出光面（135）相对设置。

Description

背光单元、背光模组、背光模组及显示装置
本发明要求2015年10月29递交的发明名称为“背光单元、背光模组、背光模组及显示装置”的申请号201510724162.4的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及液晶显示技术领域，特别涉及背光单元、背光模组、背光模组及显示装置。
背景技术
液晶显示器是当今市场上的主流显示装置技术。而显示装置都需要背光来作为光源点亮液晶显示器。传统的背光模组主要分为直下式背光和侧入式背光。侧入式背光需要导光板，导光板尺寸越大，成本越高。直下式厚度较厚，为了减小灯箱厚度，主要采取增加灯的数目或增加LED透镜扩大光分布的方式来实现，采取这两种方式，在大尺寸的情况下成本更高。
因此随着大尺寸显示器等显示装置竞争越来越激烈，提升大尺寸的规格并降低成本成为提升产品竞争力的重要考量。如何实现大尺寸直下式背光的薄型化，并降低直下式背光的成本，成为目前技术开发的重要方向。
发明内容
本发明提供一种背光单元及背光模组，以实现背光模组薄型化而节省成本的目的。
本发明还提供一种显示装置。
本发明提供的背光单元包括主反射片、设于所述主反射片的反射面上的导光板、灯源及副反射片；所述导光板包括出光面及位于出光面中部的凹槽，所述灯源设于凹槽内，所述副反射片装于所述出光面上并遮盖所述凹槽，所述副反射片的反射面朝向所述灯源。
所述背光模组包括背板、数个背光单元及扩散板，所述背板形成容纳槽， 所述背光单元包括主反射片、设于所述主反射片的反射面上的导光板、灯源及副反射片；所述导光板包括出光面及位于出光面中部的凹槽，所述灯源设于凹槽内，所述副反射片装于所述出光面上并遮盖所述凹槽，所述副反射片的反射面朝向所述灯源；所述数个背光单元间隔排列于所述容纳槽的底面，所述扩散板封闭所述容纳槽与所述出光面相对设置。
其中，所述数个背光单元成矩阵排列设置，每两个背光单元之间设有支撑体，所述支撑体相对两端分别抵持所述底面与所述扩散板。
其中，所述背光单元还包括散热器，所述散热器设于所述主反射片朝向所述底面的表面上并与所述灯源所在位置相对。
其中，所述副反射片的反射率大于所述主反射片的反射率。
其中，所述凹槽贯穿所述导光板，所述灯源于凹槽内装于所述主反射片上。
其中，所述背板包括底板及设于底板周缘的侧板，所述侧板与所述底板共同围成所述容纳槽，所述底板的位于容纳槽内的表面为所述底面。
其中，所述侧板包括连接段及有连接段延伸的斜边，所述连接段与所述底板连接，所述斜面连接连接段与所述扩散板，所述连接段与所述斜边朝向所述容纳槽的表面设有侧反射片。
其中，所述背光模组还包括光学薄膜，所述光学薄膜设于所述扩散板出光方向的表面上。
其中，所述灯源为CSP封装LED灯。
本发明还提供一种显示装置，其包括以上所述的背光模组及液晶面板，所述液晶面板装于背光模组上与所述导光板出光面相对设置。
本发明所述背光模组由数个独立的背光单元提供光源，每个背光单元使用独立的导光板供单个的灯源使用，在导光板材料上得到充分利用，可以保证光线的分布，无需增加光线扩大透镜，节省背板厚度尺寸，相较于使用整体导光板节省成本。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述 中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明较佳实施方式中的背光模组的背光单元结构示意图。
图2是本发明的背光模组整体结构的截面的示意图。
图3是本发明具有背光模组的显示装置的截面示意图。
具体实施方式
下面将结合本发明实施方式中的附图，对本发明实施方式中的技术方案进行清楚、完整地描述。
请参阅图1与图2，本发明一种背光单元及背光模组10，背光单元做为背光模组的光源，所述背光模组用于显示装置中为显示装置提供光源。所述背光模组10为直下式，其包括背板11、数个背光单元13及扩散板15。所述背板11形成容纳槽12。所述背光单元13包括主反射片131、设于所述主反射片131的反射面上的导光板132、灯源133及副反射片134。所述导光板132包括出光面135及位于出光面中部的凹槽136，所述灯源133设于凹槽136内。所述副反射片134装于所述出光面135上并遮盖所述凹槽136。所述副反射片134的反射面朝向所述灯源133。所述数个背光单元13间隔排列于所述容纳槽12的底面121，所述扩散板15封闭所述容纳槽12与所述出光面135相对设置。
所述背光模组10由数个独立的背光单元提供光源，每个背光单元使用独立的导光板132供单个的灯源133使用，在导光板材料上得到充分利用，可以保证光线的分布，无需增加光线扩大透镜，节省背板整体空间及厚度尺寸；而且对于大尺寸背光模组来说，在成本上相比使用整体的导光板更具有成本效益。同时，所述灯源133为CSP封装LED灯，功率较大，可以5面发光，在不需要增加灯源数量的基础上，与所述背光单元13配合可以降低光源成本，整体上不需要增加背板的厚度空间即可保证足够的光源效率。
本实施例中，所述背板11包括底板111及设于底板111周缘的侧板112。所述侧板112与所述底板111共同围成所述容纳槽12，所述底板111的位于容纳槽12内的表面为所述底面121。进一步的，所述侧板112包括连接段114及有连接段114延伸的斜边115，所述连接段114与所述底板111连接，所述 斜面115连接连接段114与所述扩散板15，所述连接段114与所述斜边115朝向所述容纳槽12的表面设有侧反射片116。侧反射片116可以避免背板11侧边位置出现亮带或暗框的现象。
本实施例中，所述容纳槽12大致为矩形槽状，所述扩散板15周缘抵持所述侧板112将所述容纳槽12封闭，所述扩散板15用于打散光通量，让光均匀分布还可以控制出射角度。所述扩散板15出光方向的表面上还叠加设有光学薄膜16。所述光学膜片16用于将入射的光源光线均匀扩散而变成发散光源射出，这样光线变得非常均匀，可以背解决光模组产生的光斑问题。
进一步的，所述数个背光单元13成矩阵排列设置，每两个背光单元13之间设有支撑体14，所述支撑体14相对两端分别抵持所述底面121与所述扩散板15。所述支撑体14支撑所述扩散板15，以保持背光单元13与扩散板15之间有一定的混光距离，并避免扩散板15塌陷。
本实施例中，所述主反射片131放置于所述容纳槽12的底面121上，所述主反射片131的反射面朝向所述灯源133，所述副反射片134位于导光板132的出光面135上，副反射片134的反射面1341朝向所述灯源133。所述凹槽136贯穿所述导光板132，所述灯源133于凹槽136内装于所述主反射片131上。其中，所述凹槽136的两个相对侧壁137、主反射片131及副反射片134共同围成一空间，所述灯源133位于空间内。其中，所述副反射片134的反射率大于所述主反射片141的反射率。
当所述背光模组灯源133工点亮作时，所述灯源133的光线部分经过所述凹槽136的两个相对侧壁137进入所述导光板132，通过导光板132的出光面135射出，最后经所述扩散板15及光学薄膜16作用后射出背光模组；所述灯源133还有部分光线经主反射片131及副反射片134反射后再进入所述导光板132，然后通过导光板132的出光面135射出，将所述灯源133的光线充分利用。
进一步的，所述背光单元13还包括散热器138，所述散热器138设于所述主反射片131朝向所述底面121的表面上并与所述灯源133所在位置相对，可以实现对灯源133的散热。
请参照图3，本发明还提供一种显示装置，其包括所述的背光模组10及 液晶面板20，所述液晶面板20装于背光模组10上与所述导光板132出光面相对设置。通过透过所述光学膜片16的光线为所述液晶面板20提供光源，进而实现画面显示。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (17)

  1. 一种背光单元，其特征在于，所述背光单元包括主反射片、设于所述主反射片的反射面上的导光板、灯源及副反射片；所述导光板包括出光面及位于出光面中部的凹槽，所述灯源设于凹槽内，所述副反射片装于所述出光面上并遮盖所述凹槽，所述副反射片的反射面朝向所述灯源。
  2. 一种背光模组，其特征在于，所述背光模组包括背板、数个背光单元及扩散板，所述背板形成容纳槽，所述背光单元包括主反射片、设于所述主反射片的反射面上的导光板、灯源及副反射片；所述导光板包括出光面及位于出光面中部的凹槽，所述灯源设于凹槽内，所述副反射片装于所述出光面上并遮盖所述凹槽，所述副反射片的反射面朝向所述灯源；所述数个背光单元间隔排列于所述容纳槽的底面，所述扩散板封闭所述容纳槽与所述出光面相对设置。
  3. 如权利要求2所述的背光模组，其特征在于，所述数个背光单元成矩阵排列设置，每两个背光单元之间设有支撑体，所述支撑体相对两端分别抵持所述底面与所述扩散板。
  4. 如权利要求2所述的背光模组，其特征在于，所述背光单元还包括散热器，所述散热器设于所述主反射片朝向所述底面的表面上并与所述灯源所在位置相对。
  5. 如权利要求2所述的背光模组，其特征在于，所述副反射片的反射率大于所述主反射片的反射率。
  6. 如权利要求2所述的背光模组，其特征在于，所述背板包括底板及设于底板周缘的侧板，所述侧板与所述底板共同围成所述容纳槽，所述底板的位于容纳槽内的表面为所述底面。
  7. 如权利要求6所述的背光模组，其特征在于，所述侧板包括连接段及有连接段延伸的斜边，所述连接段与所述底板连接，所述斜面连接连接段与所述扩散板，所述连接段与所述斜边朝向所述容纳槽的表面设有侧反射片。
  8. 如权利要求2所述的背光模组，其特征在于，所述背光模组还包括光学薄膜，所述光学薄膜设于所述扩散板出光方向的表面上。
  9. 如权利要求2所述的背光模组，其特征在于，所述灯源为CSP封装LED 灯。
  10. 一种显示装置，包括背光模组及液晶面板，所述液晶面板装于背光模组上与所述导光板出光面相对设置；其特征在于，所述背光模组包括背板、数个背光单元及扩散板，所述背板形成容纳槽，所述背光单元包括主反射片、设于所述主反射片的反射面上的导光板、灯源及副反射片；所述导光板包括出光面及位于出光面中部的凹槽，所述灯源设于凹槽内，所述副反射片装于所述出光面上并遮盖所述凹槽，所述副反射片的反射面朝向所述灯源；所述数个背光单元间隔排列于所述容纳槽的底面，所述扩散板封闭所述容纳槽与所述出光面相对设置。
  11. 如权利要求10所述的显示装置，其特征在于，所述数个背光单元成矩阵排列设置，每两个背光单元之间设有支撑体，所述支撑体相对两端分别抵持所述底面与所述扩散板。
  12. 如权利要求10所述的显示装置，其特征在于，所述背光单元还包括散热器，所述散热器设于所述主反射片朝向所述底面的表面上并与所述灯源所在位置相对。
  13. 如权利要求11所述的显示装置，其特征在于，所述副反射片的反射率大于所述主反射片的反射率。
  14. 如权利要求11所述的显示装置，其特征在于，所述背板包括底板及设于底板周缘的侧板，所述侧板与所述底板共同围成所述容纳槽，所述底板的位于容纳槽内的表面为所述底面。
  15. 如权利要求14所述的显示装置，其特征在于，所述侧板包括连接段及有连接段延伸的斜边，所述连接段与所述底板连接，所述斜面连接连接段与所述扩散板，所述连接段与所述斜边朝向所述容纳槽的表面设有侧反射片。
  16. 如权利要求11所述的显示装置，其特征在于，所述背光模组还包括光学薄膜，所述光学薄膜设于所述扩散板出光方向的表面上。
  17. 如权利要求11任一项所述的显示装置，其特征在于，所述灯源为CSP封装LED灯。
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