WO2016197436A1 - 一种背光模组及液晶显示装置 - Google Patents

一种背光模组及液晶显示装置 Download PDF

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Publication number
WO2016197436A1
WO2016197436A1 PCT/CN2015/084864 CN2015084864W WO2016197436A1 WO 2016197436 A1 WO2016197436 A1 WO 2016197436A1 CN 2015084864 W CN2015084864 W CN 2015084864W WO 2016197436 A1 WO2016197436 A1 WO 2016197436A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
incident
backlight module
light guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2015/084864
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English (en)
French (fr)
Inventor
陈仕祥
阙成文
李德华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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 Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/890,448 priority Critical patent/US20170168222A1/en
Publication of WO2016197436A1 publication Critical patent/WO2016197436A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from 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
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • 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
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • 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
    • G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • 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
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module and a liquid crystal display device.
  • the liquid crystal display device usually includes a front frame, a liquid crystal display, a backlight module, and a plurality of driving circuit boards.
  • the common backlight module has two types: a direct type and a side-input type.
  • the side-input type backlight module is thinner than the direct type backlight module, which is more advantageous for the design of the thinned liquid crystal display device.
  • the existing side-in-light backlight module mainly comprises a back shell, a reflective sheet, a light guide plate, a plurality of optical films, a heat dissipation bracket and an LED light bar (LB).
  • LB LED light bar
  • the number of LEDs that can be placed on the end face of the light guide plate is limited, and the larger the size of the liquid crystal display device is, the more LEDs are required, so that the large-size liquid crystal display device is usually designed with double-sided light or multiple Side light is added to increase the number of LEDs placed.
  • LB is placed on both sides or sides of the light guide plate to increase the number of LEDs placed, thereby satisfying the luminous flux required for a large-sized liquid crystal display device.
  • the technical problem to be solved by the present invention is to provide a backlight module and a liquid crystal display device, which can reduce the cost of product parts while ensuring the luminous flux of the liquid crystal display device.
  • a technical solution adopted by the present invention is to provide a backlight module, the backlight module includes: a first light guide plate, the first light guide plate has a first light incident surface, a first bottom surface, and a first a light emitting surface, the first light emitting surface is parallel to the first bottom surface, the first light incident surface is connected to the first light emitting surface and the first bottom surface; the second light guiding plate is disposed below the first light guiding plate, and includes a second light incident surface, Second illuminating surface and a second bottom surface, the second light incident surface is connected to the second light emitting surface and the second bottom surface, and is disposed flush with the first light incident surface in a vertical direction, the second light emitting surface is adjacent to the first bottom surface, and the second bottom surface is away from the second bottom
  • the light source is inclined toward the second light-emitting surface; the light source provides an incident light beam, and the incident light beam is transmitted through the first light-incident surface and the second light-incident surface in
  • A is an angle at which the second bottom faces the second illuminating surface
  • B is a illuminating half angle of the light source
  • n is a refractive index of the second light guiding plate.
  • the backlight module further includes: a heat dissipation bracket disposed outside the light source for dissipating heat generated by the light source.
  • the backlight module includes: a first light guide plate having a first light incident surface, a first bottom surface, and a first light guide plate a first light-emitting surface is parallel to the first bottom surface, the first light-incident surface is connected to the first light-emitting surface and the first bottom surface; and the second light-guiding plate is disposed under the first light guide plate, and includes a second light-incident surface a second light-emitting surface and a second bottom surface, wherein the second light-incident surface is connected to the second light-emitting surface and the second bottom surface, and is disposed flush with the first light-incident surface in a vertical direction, and the second light-emitting surface is adjacent to the first bottom surface,
  • the bottom surface is inclined toward the second light exiting surface in a direction away from the second light incident surface; the light source provides an incident light beam, and the incident light beam is in the first light guide plate and
  • the light source includes a first light bar and a second light bar respectively corresponding to the first light incident surface and the second light incident surface.
  • A is an angle at which the second bottom faces the second illuminating surface
  • B is a illuminating half angle of the light source
  • n is a refractive index of the second light guiding plate.
  • the second bottom surface is connected to the second light exit surface in a direction away from the second light incident surface.
  • the second light guide plate further includes a connecting surface disposed opposite to the second light incident surface, and the connecting surface connects the second light emitting surface and the second bottom surface in a direction away from the second light incident surface.
  • the width of the second light-emitting surface is smaller than the width of the first bottom surface, and the width of the second light-emitting surface is smaller than the width of the second bottom surface.
  • the backlight module further includes a first reflective sheet and a second reflective sheet.
  • the first reflective sheet is parallel to the first bottom surface and covers a region of the first bottom surface exposing the second light guide plate.
  • the second reflective sheet is parallel to the second bottom surface. Covering the second bottom surface.
  • the backlight module further includes: a heat dissipation bracket disposed outside the light source for dissipating heat generated by the light source.
  • the second illuminating surface is bonded to the first bottom surface by a transparent colloid, and the transparent colloid comprises an optical UV glue.
  • the liquid crystal display device includes a backlight module
  • the backlight module includes: a first light guide plate, and the first light guide plate has a first input a light surface, a first bottom surface and a first light emitting surface, the first light emitting surface is parallel to the first bottom surface, the first light incident surface is connected to the first light emitting surface and the first bottom surface; and the second light guiding plate is disposed below the first light guiding plate
  • the second light incident surface is connected to the second light emitting surface and the second bottom surface, and is disposed flush with the first light incident surface in the vertical direction, and the second The light emitting surface is adjacent to the first bottom surface, and the second bottom surface is inclined toward the second light emitting surface in a direction away from the second light incident surface;
  • the light source provides an incident light beam, and the incident light beam is first through the first light incident surface and the second light incident surface After being transmitted in the light guide plate and the second light guide plate,
  • the light source includes a first light bar and a second light bar respectively corresponding to the first light incident surface and the second light incident surface.
  • A is an angle at which the second bottom faces the second illuminating surface
  • B is a illuminating half angle of the light source
  • n is a refractive index of the second light guiding plate.
  • the second bottom surface is connected to the second light exit surface in a direction away from the second light incident surface.
  • the second light guide plate further includes a connecting surface disposed opposite to the second light incident surface, and the connecting surface connects the second light emitting surface and the second bottom surface in a direction away from the second light incident surface.
  • the width of the second light-emitting surface is smaller than the width of the first bottom surface, and the width of the second light-emitting surface is smaller than the width of the second bottom surface.
  • the backlight module further includes a first reflective sheet and a second reflective sheet.
  • the first reflective sheet is parallel to the first bottom surface and covers a region of the first bottom surface exposing the second light guide plate.
  • the second reflective sheet is parallel to the second bottom surface. Covering the second bottom surface.
  • the backlight module further includes: a heat dissipation bracket disposed outside the light source for dissipating heat generated by the light source.
  • the second illuminating surface is bonded to the first bottom surface by a transparent colloid, and the transparent colloid comprises an optical UV glue.
  • the backlight module of the present invention includes a first light guide plate and a second light guide plate disposed under the first light guide plate, wherein the first light guide plate is first inserted.
  • the smooth surface and the second light incident surface of the second light guide plate are flush disposed in a vertical direction, each of which receives an incident light beam supplied from the light source.
  • the second bottom surface of the second light guide plate is inclined toward the second light exit surface in a direction away from the second light incident surface, so that the incident light beam received by the second light incident surface of the second light guide plate can be guided to the first light guide.
  • the direction of the light plate is conducted and finally exits by the first light guide plate.
  • the present invention provides two light-incident surfaces on the incident beam side, so that LB can be disposed only on the two light-incident side to achieve the luminous flux required for the large-sized liquid crystal display device, so only two inputs are required.
  • a heat-dissipating bracket is provided on the glossy side to dissipate heat from the LB, thereby reducing the cost of the product parts.
  • FIG. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a second light guide plate in the backlight module shown in FIG. 1;
  • FIG. 3 is another schematic structural view of a second light guide plate in the backlight module shown in FIG. 1;
  • FIG. 4 is a schematic structural view of a light source in the backlight module shown in FIG. 1.
  • FIG. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention.
  • the liquid crystal display device 10 of the embodiment of the present invention includes a backlight module 100 , a liquid crystal panel 200 , a front frame 300 , a back frame 400 , and a middle frame 500 .
  • the front frame 300 and the back frame 400 cooperate to form an accommodating space for accommodating the backlight module 100, the liquid crystal panel 200, and the middle frame 500.
  • the backlight module 100 is disposed on the back frame 400.
  • the middle frame 500 presses the backlight module 100 and receives the liquid crystal panel 200 such that the liquid crystal panel 200 is located in the light emitting direction of the backlight module 100.
  • the backlight module 100 includes a first light guide plate 11 , a second light guide plate 12 , a light source 13 , and a heat dissipation bracket 14 .
  • the first light guide plate 11 has a first light incident surface 110, a first bottom surface 111, and a first light exit surface 112.
  • the first light-emitting surface 112 is parallel to the first bottom surface 111
  • the first light-incident surface 110 is connected to the first light-emitting surface 112 and the first bottom surface 111 .
  • the first light guide plate 11 is preferably a rectangular structure, and the first light incident surface 110 is disposed perpendicular to the first light exit surface 112 and the first bottom surface 111.
  • the second light guide plate 12 is disposed under the first light guide plate 11.
  • the second light guide plate 12 includes a second light incident surface 120, a second light exit surface 121, and a second bottom surface 122.
  • the second light incident surface 120 is connected to the second light emitting surface.
  • 121 and the second bottom surface 122 are disposed flush with the first light incident surface 110 in the vertical direction, the second light exit surface 121 is adjacent to the first bottom surface 111, and the second bottom surface 122 is oriented away from the second light incident surface 120.
  • the second light-emitting surface 121 is inclined such that the second light guide plate 12 has a wedge-shaped structure.
  • the light source 113 provides an incident light beam that is transmitted through the first light-incident surface 110 and the second light-incident surface 120 in the first light guide plate 11 and the second light guide plate 12 and then exits from the first light-emitting surface 112.
  • the light source 13 of this embodiment may be an LED light source.
  • the heat dissipation bracket 14 is disposed outside the light source 13 for dissipating heat generated by the light source 13.
  • the present invention can satisfy the luminous flux of the large-sized liquid crystal display device.
  • the light source 13 is disposed only on one side of the first light incident surface 110 and the second light incident surface 120, so that heat dissipation is only required on one side of the first light incident surface 110 and the second light incident surface 120.
  • the bracket 14 reduces the cost of the product parts and optimizes the light-incident structure of the backlight module 100 compared to the prior art solution of providing the heat-dissipating bracket on both sides or sides of the light guide plate.
  • the light guide plate used in the liquid crystal display device 10 is generally a plate having a uniform thickness
  • the width of the light incident surface is the same as the thickness of the plate. If the width of the light incident surface of the light guide plate is directly increased, a thicker light guide plate is required.
  • the raw material causes an increase in the thickness of the entire liquid crystal display device 10, which is disadvantageous for the thin design.
  • the two-layer light guide plate of the first light guide plate 11 and the second light guide plate 12 is disposed at the light entrance of the light source 13.
  • the first light guide plate 11 is a large plate body and serves as a main light guiding element.
  • the width of the light incident surface can be increased without increasing the thickness of the large plate body of the light guide plate, and more light flux can be obtained without increasing the overall thickness of the liquid crystal display device 10.
  • the second light-emitting surface 121 is parallel to the first bottom surface 111, and the second light-emitting surface 121 and the first bottom surface 111 are bonded by a transparent colloid, and the transparent colloid includes an optical UV glue.
  • the width of the second light exit surface 121 is smaller than the width of the first bottom surface 111.
  • the width of the second light-emitting surface 121 is preferably greater than or equal to twice the thickness of the second light guide plate 12.
  • the width of the second light-emitting surface 121 is smaller than the width of the second bottom surface 122.
  • the structure of the second light guide plate 12 includes the following two types:
  • FIG. 2 is a schematic view showing the first structure of the second light guide plate 12 according to the embodiment of the present invention.
  • the second light incident surface 120 of the second light guide plate is disposed perpendicular to the second light exit surface 122.
  • the second bottom surface 122 is connected to the second light-emitting surface 121 in a direction away from the second light-incident surface 120.
  • the second bottom surface 122 further includes an inclined portion 1220 and a flat portion 1221.
  • the flat portion 1221 is perpendicularly connected to the second light incident surface 120 at an end away from the inclined portion 1220 .
  • the inclined portion 1220 is inclined toward the second light-emitting surface 121 in a direction away from the flat portion 1221 , and one end of the inclined portion 1220 away from the flat portion 1221 is in contact with the second light-emitting surface 121 .
  • the inclined portion 1220 is inclined at an angle Meet the following relationship
  • A is an angle at which the inclined portion 1220 of the second bottom surface 122 is inclined toward the second light-emitting surface 121
  • B is a half-angle of light emission of the light source 13
  • n is a refractive index of the second light guide plate 12.
  • the second light guide plate 12 is easily clamped when the second light guide plate 12 is formed to ensure the accuracy of the slope shape of the inclined portion 1220 of the second light guide plate 12.
  • FIG. 3 is a second schematic structural diagram of the second light guide plate 12 according to an embodiment of the present invention.
  • the second light guide plate 120 includes a second light-incident surface 120, a second light-emitting surface 121, and a second bottom surface 122, and a connecting surface 124 disposed opposite to the second light-incident surface 120.
  • the connecting surface 124 of the embodiment is parallel to the second light incident surface 120, and the length of the connecting surface 124 is smaller than the length of the second light incident surface 120.
  • the connecting surface 124 connects the second light emitting surface 121 and the second bottom surface 122 in a direction away from the second light incident surface 120, specifically, the inclined portion 1220 that connects the second bottom surface 122.
  • the structures of the second light-incident surface 120, the second light-emitting surface 121, and the second bottom surface 122 shown in FIG. 3 are the same as those shown in FIG. 2, and details are not described herein again.
  • the second light guide plate 12 shown in FIG. 3 adds a connecting surface 124 to form a trapezoidal structure, thereby avoiding the sharp corner structure at the junction of the inclined portion 1220 and the second light exiting surface 121 of the second light guiding plate 12 shown in FIG. It is advantageous to increase the strength of the second light guide plate 12.
  • the backlight module 100 of the present embodiment further includes a reflective sheet 15 covering the second bottom surface 122 and the first bottom surface 111 of the second light guide plate 12 .
  • the emission sheet 15 includes a first reflection sheet 151 and a second reflection sheet 152.
  • the first reflective sheet 151 is parallel to the first bottom surface 111 and covers a region of the first bottom surface 111 exposing the second light guide plate 12 .
  • the second reflective sheet 152 is parallel to the second bottom surface 122 and covers the second bottom surface 122 .
  • FIG. 4 is a schematic structural diagram of a light source 13 according to an embodiment of the present invention.
  • the light source 13 of the embodiment of the present invention includes a PCB board 130 and a pair of first light incident surfaces 110 disposed on the PCB board 130.
  • the first light bar 131 and the second light bar 132 should be disposed corresponding to the second light incident surface 120.
  • the first light bar 131 and the second light bar 132 are disposed in parallel, and respectively include a plurality of LED lamp beads 133 and 134, and LED lamp beads 134 are disposed between two adjacently disposed LED lamp beads 133, so that the LED light beads 133 and 134 misplaced settings. Thereby the incident beam emitted by the source 13 is made more uniform.
  • the heat dissipation bracket 14 of the embodiment has an L-shaped structure.
  • the heat dissipation bracket 14 includes a first portion 140 and a second portion 141 that are perpendicular to each other, wherein the first portion 140 is disposed to be disposed on a side of the light source 13 where the light bar is not disposed, and the second portion 141 is disposed on the back frame, such that The heat received by the first portion 140 can be conducted to the second portion 141 for dissipation.
  • the heat dissipation bracket 14 is usually made of a material with good heat dissipation effect such as aluminum.
  • the heat dissipation bracket 14 can also be configured in a ⁇ shape.
  • the liquid crystal panel of the embodiment of the invention can reduce the cost of the product parts and optimize the light-in structure of the backlight module.

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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)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

一种背光模组及液晶显示装置。背光模组(100)包括第一导光板(11)、第二导光板(12)和光源(13)。其中，第二导光板(12)设置在第一导光板(11)的下方，第二导光板(12)的第二出光面(121)邻接第一导光板(11)的第一底面(111)，第二底面(122)在远离第二入光面(120)的方向上朝向第二出光面(121)倾斜；光源(13)提供入射光束，入射光束在第一导光板(11)和第二导光板(12)中传输后由第一出光面(112)出射。通过上述方式能够降低产品零件成本。

Description

一种背光模组及液晶显示装置 【技术领域】
本发明涉及显示技术领域，特别是涉及一种背光模组及液晶显示装置。
【背景技术】
液晶显示装置通常包含一前框、液晶显示屏、背光模组以及若干驱动电路板。常见的背光模组有直下式和侧入光式两种，侧入光式背光模组在厚度上较直下式背光模组薄，更有利于薄型化液晶显示装置的造型设计。
现有的侧入光式背光模组主要包含一后壳、反射片、导光板、若干光学膜片、散热支架和LED灯条(LB)。通常一条LB上只设置有一行LED灯珠，并将其安置在导光板的端面，令其发出的光线可射入导光板内部进行混光。然而，由于导光板端面所能放置的LED颗数有限，且液晶显示装置尺寸越大时所需要的LED颗数越多，因此通常在大尺寸液晶显示装置设计时会采用双侧入光或者多侧入光的方式来增加LED放置的颗数。具体而言，即在导光板的两个侧面或多个侧面上放置LB，以增加LED放置的颗数，从而满足大尺寸液晶显示装置所需要的光通量。
但是LED灯条(LB)的增加，会导致LED散热支架也会随之对应的增加，所以其散热成本上升，且不利于产品造型设计。
【发明内容】
本发明主要解决的技术问题是提供一种背光模组及液晶显示装置，可以在保证液晶显示装置的光通量的情况下，降低产品零件成本。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种背光模组，该背光模组包括：第一导光板，第一导光板具有第一入光面、第一底面和第一出光面，第一出光面平行于第一底面，第一入光面连接第一出光面和第一底面；第二导光板，设置在第一导光板的下方，其包括第二入光面、第二出光面和第 二底面，第二入光面连接第二出光面和第二底面且与第一入光面在竖直方向上齐平设置，第二出光面邻接第一底面，第二底面在远离第二入光面的方向上朝向第二出光面倾斜；光源，提供入射光束，入射光束经由第一入光面和第二入光面在第一导光板和第二导光板中传输后由第一出光面出射；散热支架，设置在光源外侧，用于散除光源产生的热量；其中，光源包括分别与第一入光面对应和第二入光面对应设置的第一灯条和第二灯条；
第二底面朝向第二出光面倾斜的角度满足以下关系：
Figure PCTCN2015084864-appb-000001
其中，A为第二底面向第二出光面倾斜的角度，B为光源的发光半角，n为第二导光板的折射率。
其中，背光模组还包括：散热支架，设置在光源外侧，用于散除光源产生的热量。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种背光模组，该背光模组包括：第一导光板，第一导光板具有第一入光面、第一底面和第一出光面，第一出光面平行于第一底面，第一入光面连接第一出光面和第一底面；第二导光板，设置在第一导光板的下方，其包括第二入光面、第二出光面和第二底面，第二入光面连接第二出光面和第二底面且与第一入光面在竖直方向上齐平设置，第二出光面邻接第一底面，第二底面在远离第二入光面的方向上朝向第二出光面倾斜；光源，提供入射光束，入射光束经由第一入光面和第二入光面在第一导光板和第二导光板中传输后由第一出光面出射；散热支架，设置在光源外侧，用于散除光源产生的热量。
其中，光源包括分别与第一入光面对应和第二入光面对应设置的第一灯条和第二灯条。
其中，第二底面朝向第二出光面倾斜的角度满足以下关系：
Figure PCTCN2015084864-appb-000002
其中，A为第二底面向第二出光面倾斜的角度，B为光源的发光半角，n为第二导光板的折射率。
其中，第二底面在远离第二入光面的方向上与第二出光面连接。
其中，第二导光板还包括与第二入光面相对设置的连接面，连接面在远离第二入光面的方向上连接第二出光面和第二底面。
其中，第二出光面的宽度小于第一底面的宽度，第二出光面的宽度小于第二底面的宽度。
其中，背光模组进一步包括第一反射片和第二反射片，第一反射片与第一底面平行且覆盖第一底面的露出第二导光板的区域，第二反射片与第二底面平行且覆盖第二底面。
其中，背光模组还包括：散热支架，设置在光源外侧，用于散除光源产生的热量。
其中，第二出光面与第一底面通过透明胶体粘合，透明胶体包括光学UV胶。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种液晶显示装置，该液晶显示装置包括背光模组，背光模组包括：第一导光板，第一导光板具有第一入光面、第一底面和第一出光面，第一出光面平行于第一底面，第一入光面连接第一出光面和第一底面；第二导光板，设置在第一导光板的下方，其包括第二入光面、第二出光面和第二底面，第二入光面连接第二出光面和第二底面且与第一入光面在竖直方向上齐平设置，第二出光面邻接第一底面，第二底面在远离第二入光面的方向上朝向第二出光面倾斜；光源，提供入射光束，入射光束经由第一入光面和第二入光面在第一导光板和第二导光板中传输后由第一出光面出射。
其中，光源包括分别与第一入光面对应和第二入光面对应设置的第一灯条和第二灯条。
其中，第二底面朝向第二出光面倾斜的角度满足以下关系：
Figure PCTCN2015084864-appb-000003
其中，A为第二底面向第二出光面倾斜的角度，B为光源的发光半角，n为第二导光板的折射率。
其中，第二底面在远离第二入光面的方向上与第二出光面连接。
其中，第二导光板还包括与第二入光面相对设置的连接面，连接面在远离第二入光面的方向上连接第二出光面和第二底面。
其中，第二出光面的宽度小于第一底面的宽度，第二出光面的宽度小于第二底面的宽度。
其中，背光模组进一步包括第一反射片和第二反射片，第一反射片与第一底面平行且覆盖第一底面的露出第二导光板的区域，第二反射片与第二底面平行且覆盖第二底面。
其中，背光模组还包括：散热支架，设置在光源外侧，用于散除光源产生的热量。
其中，第二出光面与第一底面通过透明胶体粘合，透明胶体包括光学UV胶。
本发明的有益效果是：区别于现有技术的情况，本发明的背光模组包括第一导光板和设置在第一导光板下方的第二导光板，其中，第一导光板的第一入光面和第二导光板的第二入光面在竖直方向上齐平设置，其均接收来自光源提供的入射光束。进一步的，第二导光板的第二底面在远离第二入光面的方向上朝向第二出光面倾斜，使得可以引导第二导光板的第二入光面接收到的入射光束往第一导光板的方向传导，并最终由第一导光板出射。通过上述方式，本发明在入射光束侧设置了两个入光面，使得只在两个入光面侧设置LB即可达到大尺寸的液晶显示装置所需的光通量，因此只需要在两个入光面侧设置散热支架来对LB进行散热即可，从而降低了产品零件成本。
【附图说明】
图1是本发明实施例提供的一种液晶显示装置的结构示意图；
图2是图1所示的背光模组中的第二导光板的一种结构示意图；
图3是图1所示的背光模组中的第二导光板的另一种结构示意图；
图4是图1所示的背光模组中的光源的结构示意图。
【具体实施方式】
请参考图1，图1是本发明实施例提供的一种液晶显示装置的结构示意图。如图1所示，本发明实施例的液晶显示装置10包括背光模组100、液晶面板200、前框300、背框400以及中框500。前框300和背框400配合形成一容置空间，以收容背光模组100、液晶面板200以及中框500。其中，背光模组100设置在背框400上，中框500压持背光模组100，并且承接液晶面板200，使得液晶面板200位于背光模组100的出光方向上。
其中，背光模组100包括第一导光板11、第二导光板12、光源13以及散热支架14。第一导光板11具有第一入光面110、第一底面111和第一出光面112。第一出光面112平行于第一底面111，第一入光面110连接第一出光面112和第一底面111。本实施例中，第一导光板11优选为矩形结构，第一入光面110均与第一出光面112和第一底面111垂直设置。
第二导光板12设置在第一导光板11的下方，第二导光板12包括第二入光面120、第二出光面121和第二底面122，第二入光面120连接第二出光面121和第二底面122且与第一入光面110在竖直方向上齐平设置，第二出光面121邻接第一底面111，第二底面122在远离第二入光面120的方向上朝向第二出光面121倾斜，使得第二导光板12为一楔形结构。
光源113提供入射光束，该入射光束经由第一入光面110和第二入光面120在第一导光板11和第二导光板12中传输后由第一出光面112出射。本实施例的光源13可为LED光源。
散热支架14设置在光源13外侧，用于散除光源13产生的热量。
因此，本实施例中，由于设置了第一导光板11和第二导光板12来接收入射光束，使得本发明能够满足大尺寸的液晶显示装置的光通量。进一步的，本发明实施例只在第一入光面110和第二入光面120的一侧设置光源13，使得只需在第一入光面110和第二入光面120的一侧散热支架14，相比于现有技术的要在导光板的两侧或多侧设置散热支架的技术方案，本发明实施例降低了产品零件成本，并且优化了背光模组100的入光结构。
更进一步的，因为液晶显示装置10所用的导光板一般为厚度均匀的板材，其入光面宽度和其板材厚度一致，若选用直接增加导光板入光面的宽度则需选用更厚的导光板原材，导致液晶显示装置10整体的厚度增加，不利于薄型化设计。本发明实施例在光源13的入光处设置第一导光板11和第二导光板12这双层导光板。其中第一导光板11为大板体，作为主要导光的元件。本发明实施例可在不增加导光板大板体厚度的情况下增加入光面的宽度，在不增加液晶显示装置10整体厚度的情况下可获得更多的入光光通量。
本实施例中，第二出光面121与第一底面111平行，并且第二出光面121与第一底面111通过透明胶体粘合，该透明胶体包括光学UV胶。第二出光面121的宽度小于第一底面111的宽度。为了便于加工，第二出光面121的宽度优选大于或等于第二导光板12的厚度的两倍。
进一步的，第二出光面121的宽度小于第二底面122的宽度。具体而言，第二导光板12的结构包括以下两种：
第一种结构：请参阅图2所示，图2为本发明实施例的第二导光板12的第一种结构示意图。如图2所示，第二导光板的第二入光面120与第二出光面122垂直设置。第二底面122在远离第二入光面120的方向上与第二出光面121连接。具体而言，第二底面122还包括相接的倾斜部1220和平坦部1221。其中，平坦部1221在远离倾斜部1220的一端与第二入光面120垂直相接。倾斜部1220在远离平坦部1221的方向上朝向第二出光面121倾斜，并且倾斜部1220的远离平坦部1221的一端与第二出光面121相接。其中，倾斜部1220倾斜的角度 满足以下关系
Figure PCTCN2015084864-appb-000004
其中，A为第二底面122的倾斜部1220向第二出光面121倾斜的角度，B为光源13的发光半角，n为第二导光板12的折射率。
本实施例中，由于设置了平坦部1221，使得制作第二导光板12时方便夹持，以保证第二导光板12的倾斜部1220的斜面形状的精度。
第二种结构：请参阅图3，图3为本发明实施例的第二导光板12的第二种结构示意图。如图3所示，第二导光板120除了包括第二入光面120、第二出光面121以及第二底面122外，还包括与第二入光面120相对设置的连接面124，优选的，本实施例的连接面124与第二入光面120平行，并且连接面124的长度小于第二入光面120的长度。连接面124在远离第二入光面120的方向上连接第二出光面121和第二底面122，具体为连接第二底面122的倾斜部1220。其中，图3所示的第二入光面120、第二出光面121以及第二底面122的结构分别与图2所示的相同，在此不再赘述。
图3所示第二导光板12增加了连接面124，形成了一梯形结构，从而避免了图2所示的第二导光板12的倾斜部1220和第二出光面121连接处的尖角结构，有利于提高第二导光板12的强度。
请再参阅图1，本实施例的背光模组100进一步包括反射片15，反射片15覆盖第二底面122及第一底面111的露出第二导光板12的区域。具体的，发射片15包括第一反射片151和第二反射片152。第一反射片151与第一底面111平行且覆盖第一底面111的露出第二导光板12的区域，第二反射片152与第二底面122平行且覆盖第二底面122。
为了保证入射到第一导光板11和第二导光板12的光通量，本发明实施例设置了分别与第一导光板11和第二导光板12对应的灯条。具体请参阅图4，图4是本发明实施例提供的光源13的结构示意图。如图4所示，本发明实施例的光源13包括PCB板130以及设置在PCB板130上的分别与第一入光面110对 应和第二入光面120对应设置的第一灯条131和第二灯条132。其中，第一灯条131和第二灯条132平行设置，且分别包含多个LED灯珠133和134，并且两相邻设置的LED灯珠133之间设置LED灯珠134，使得LED灯珠133和134错位设置。从而使得光源13发出的入射光束更加均匀。
请再参阅图1，本实施例的散热支架14为L型结构。具体而言，散热支架14包括相互垂直的第一部分140和第二部分141，其中第一部分140与光源13的未设置灯条的一侧贴合设置，第二部分141设置在背框上，使得第一部分140接收到的热量可以传导到第二部分141上来进行散除。其中，散热支架14通常为铝等散热效果好的材料制成。
在其他实施例中，散热支架14还可以设置为匚型。
综上所述，本发明实施例的液晶面板能够降低产品零件成本，并优化背光模组的入光结构。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (20)

  1. 一种背光模组，其中，所述背光模组包括：
    第一导光板，所述第一导光板具有第一入光面、第一底面和第一出光面，所述第一出光面平行于所述第一底面，所述第一入光面连接所述第一出光面和所述第一底面；
    第二导光板，设置在所述第一导光板的下方，其包括第二入光面、第二出光面和第二底面，所述第二入光面连接所述第二出光面和所述第二底面且与所述第一入光面在竖直方向上齐平设置，所述第二出光面邻接所述第一底面，所述第二底面在远离所述第二入光面的方向上朝向所述第二出光面倾斜；
    光源，提供入射光束，所述入射光束经由所述第一入光面和所述第二入光面在所述第一导光板和所述第二导光板中传输后由所述第一出光面出射；
    其中，所述光源包括分别与所述第一入光面对应和所述第二入光面对应设置的第一灯条和第二灯条；
    所述第二底面朝向所述第二出光面倾斜的角度满足以下关系：
    Figure PCTCN2015084864-appb-100001
    其中，所述A为所述第二底面向所述第二出光面倾斜的角度，所述B为所述光源的发光半角，所述n为所述第二导光板的折射率。
  2. 根据权利要求1所述的背光模组，其中，所述背光模组还包括：
    散热支架，设置在所述光源外侧，用于散除所述光源产生的热量。
  3. 一种背光模组，其中，所述背光模组包括：
    第一导光板，所述第一导光板具有第一入光面、第一底面和第一出光面，所述第一出光面平行于所述第一底面，所述第一入光面连接所述第一出光面和所述第一底面；
    第二导光板，设置在所述第一导光板的下方，其包括第二入光面、第二出光面和第二底面，所述第二入光面连接所述第二出光面和所述第二底面且与所述第一入光面在竖直方向上齐平设置，所述第二出光面邻接所述第一底面，所 述第二底面在远离所述第二入光面的方向上朝向所述第二出光面倾斜；
    光源，提供入射光束，所述入射光束经由所述第一入光面和所述第二入光面在所述第一导光板和所述第二导光板中传输后由所述第一出光面出射。
  4. 根据权利要求3所述的背光模组，其中，所述光源包括分别与所述第一入光面对应和所述第二入光面对应设置的第一灯条和第二灯条。
  5. 根据权利要求3所述的背光模组，其中，所述第二底面朝向所述第二出光面倾斜的角度满足以下关系：
    Figure PCTCN2015084864-appb-100002
    其中，所述A为所述第二底面向所述第二出光面倾斜的角度，所述B为所述光源的发光半角，所述n为所述第二导光板的折射率。
  6. 根据权利要求3所述的背光模组，其中，所述第二底面在远离所述第二入光面的方向上与所述第二出光面连接。
  7. 根据权利要求3所述的背光模组，其中，所述第二导光板还包括与所述第二入光面相对设置的连接面，所述连接面在远离所述第二入光面的方向上连接所述第二出光面和第二底面。
  8. 根据权利要求3所述的背光模组，其中，所述第二出光面的宽度小于所述第一底面的宽度，所述第二出光面的宽度小于所述第二底面的宽度。
  9. 根据权利要求8所述的背光模组，其中，所述背光模组进一步包括第一反射片和第二反射片，所述第一反射片与所述第一底面平行且覆盖所述第一底面的露出所述第二导光板的区域，所述第二反射片与所述第二底面平行且覆盖所述第二底面。
  10. 根据权利要求3所述的背光模组，其中，所述背光模组还包括：
    散热支架，设置在所述光源外侧，用于散除所述光源产生的热量。
  11. 根据权利要求3所述的背光模组，其中，所述第二出光面与所述第一底面通过透明胶体粘合，所述透明胶体包括光学UV胶。
  12. 一种液晶显示装置，其中，所述液晶显示装置包括背光模组，所述背 光模组包括：
    第一导光板，所述第一导光板具有第一入光面、第一底面和第一出光面，所述第一出光面平行于所述第一底面，所述第一入光面连接所述第一出光面和所述第一底面；
    第二导光板，设置在所述第一导光板的下方，其包括第二入光面、第二出光面和第二底面，所述第二入光面连接所述第二出光面和所述第二底面且与所述第一入光面在竖直方向上齐平设置，所述第二出光面邻接所述第一底面，所述第二底面在远离所述第二入光面的方向上朝向所述第二出光面倾斜；
    光源，提供入射光束，所述入射光束经由所述第一入光面和所述第二入光面在所述第一导光板和所述第二导光板中传输后由所述第一出光面出射。
  13. 根据权利要求12所述的液晶显示装置，其中，所述光源包括分别与所述第一入光面对应和所述第二入光面对应设置的第一灯条和第二灯条。
  14. 根据权利要求12所述的液晶显示装置，其中，所述第二底面朝向所述第二出光面倾斜的角度满足以下关系：
    Figure PCTCN2015084864-appb-100003
    其中，所述A为所述第二底面向所述第二出光面倾斜的角度，所述B为所述光源的发光半角，所述n为所述第二导光板的折射率。
  15. 根据权利要求12所述的液晶显示装置，其中，所述第二底面在远离所述第二入光面的方向上与所述第二出光面连接。
  16. 根据权利要求12所述的液晶显示装置，其中，所述第二导光板还包括与所述第二入光面相对设置的连接面，所述连接面在远离所述第二入光面的方向上连接所述第二出光面和第二底面。
  17. 根据权利要求12所述的液晶显示装置，其中，所述第二出光面的宽度小于所述第一底面的宽度，所述第二出光面的宽度小于所述第二底面的宽度。
  18. 根据权利要求17所述的液晶显示装置，其中，所述背光模组进一步包括第一反射片和第二反射片，所述第一反射片与所述第一底面平行且覆盖所述 第一底面的露出所述第二导光板的区域，所述第二反射片与所述第二底面平行且覆盖所述第二底面。
  19. 根据权利要求12所述的液晶显示装置，其中，所述背光模组还包括：
    散热支架，设置在所述光源外侧，用于散除所述光源产生的热量。
  20. 根据权利要求12所述的液晶显示装置，其中，所述第二出光面与所述第一底面通过透明胶体粘合，所述透明胶体包括光学UV胶。
PCT/CN2015/084864 2015-06-08 2015-07-23 一种背光模组及液晶显示装置 Ceased WO2016197436A1 (zh)

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