CN108732821B - Liquid crystal display and backlight module thereof - Google Patents

Liquid crystal display and backlight module thereof Download PDF

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Publication number
CN108732821B
CN108732821B CN201810579894.2A CN201810579894A CN108732821B CN 108732821 B CN108732821 B CN 108732821B CN 201810579894 A CN201810579894 A CN 201810579894A CN 108732821 B CN108732821 B CN 108732821B
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China
Prior art keywords
light guide
fixing plate
guide plate
backlight module
plate
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CN201810579894.2A
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CN108732821A (en
Inventor
李德华
俞刚
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Huizhou China Star Optoelectronics Technology Co Ltd
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Huizhou China Star Optoelectronics Technology Co Ltd
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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
    • G02F1/133608—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
    • 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

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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

The invention discloses a liquid crystal display and a backlight module thereof. The backlight module comprises: a heat sink including first and second fixing plates facing each other and a third fixing plate connected to the same side of the first and second fixing plates; a light guide plate disposed between the first fixing plate and the second fixing plate; the light bar is arranged on the third fixing plate and faces the light incident surface of the light guide plate; and an extrusion member disposed on the second fixing plate, the extrusion member extruding the light guide plate to fix the light guide plate with the first fixing plate. Through setting up the extruded article for the light guide plate is fixed in U type is heat sink steadily under the extrusion of extruded article, thereby makes the relative position between income plain noodles of light guide plate and the lamp strip fixed steadily, thereby reaches and improves the income plain accuracy, reduces the energy consumption, improves module quality of being shaded purpose, has also saved simultaneously and has glued the frame, is favorable to backlight unit's narrow frame design.

Description

Liquid crystal display and backlight module thereof
Technical Field
The invention belongs to the technical field of display, and particularly relates to a liquid crystal display and a backlight module thereof.
Background
Liquid crystal display devices have been widely used in the display field because of their advantages such as low radiation and low power consumption. With the continuous progress of the liquid crystal industry technology, the large size and the thin type of the liquid crystal display device have become the mainstream demands of the household appliance market. The liquid crystal display device generally includes a liquid crystal panel and a backlight module, wherein the backlight module provides a light source for the whole device, and the structural design thereof determines the large size and the thin type of the liquid crystal display device to a great extent, so that the narrow frame of the backlight module frame becomes a trend in the backlight industry. However, as the frame of the liquid crystal display device becomes narrower and thinner, the thickness of the liquid crystal display device becomes thinner and thinner, and how to ensure the light coupling precision of the backlight with high precision is a technical problem to be solved by the industry.
Disclosure of Invention
In order to solve the above-mentioned deficiencies of the prior art, the present invention provides a backlight module and a liquid crystal display, which can improve the light coupling precision and facilitate the design of a narrow frame.
In order to achieve the purpose, the invention adopts the following technical scheme:
a backlight module includes:
a heat sink including first and second fixing plates facing each other and a third fixing plate connected to the same side of the first and second fixing plates;
a light guide plate disposed between the first fixing plate and the second fixing plate;
the light bar is arranged on the third fixing plate and faces the light incident surface of the light guide plate;
and an extrusion member disposed on the second fixing plate, the extrusion member extruding the light guide plate to fix the light guide plate with the first fixing plate.
Preferably, the backlight module further comprises a pressing strip, wherein the pressing strip is arranged on the extrusion piece and the light guide plate, and the extrusion piece extrudes the pressing strip so that the pressing strip extrudes the light guide plate.
Preferably, the backlight module further comprises a positioning column fixed on the second fixing plate, and the positioning column penetrates through the pressing strip.
Preferably, the backlight module further comprises a back plate and a reflective sheet, the back plate is arranged between the pressing strip and the light guide plate, and the reflective sheet is arranged between the back plate and the light guide plate.
Preferably, the backlight module further includes a buffer sheet disposed between the light guide plate and the first fixing plate.
Preferably, the buffer sheet is adhered to the first fixing plate.
Preferably, the extrusion piece is a screw, a second through hole is formed in the second fixing plate, and the extrusion piece is connected to the second through hole in a threaded mode so as to extrude the light guide plate.
Or, the extruded part is a screw, a second through hole is formed in the second fixing plate, and the extruded part is in threaded connection with the second through hole so as to extrude the pressing strip.
Preferably, the pressing member is an elastic member, the pressing member is located between the second fixing plate and the light guide plate, and both ends of the pressing member elastically press the second fixing plate and the light guide plate, respectively.
The invention also discloses a liquid crystal display, which comprises a front frame, a display panel and any one of the backlight modules, wherein the display panel is arranged on the backlight module, and the front frame is covered on the display panel.
The invention has the beneficial effects that: according to the liquid crystal display and the backlight module thereof disclosed by the invention, the extrusion piece is arranged, so that the light guide plate is stably fixed in the U-shaped heat sink under the extrusion action of the extrusion piece, and the relative position between the light incident surface of the light guide plate and the light bar is stably fixed, thereby achieving the purposes of improving the light incident precision, reducing the backlight light leakage, reducing the energy consumption and improving the backlight taste of the module, simultaneously saving the rubber frame and being beneficial to the narrow frame design of the backlight module.
Drawings
Fig. 1 is a cross-sectional view of a backlight module according to a first embodiment of the invention;
fig. 2 is a diagram of a heat sink, a positioning column and a pressing bar according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view of a backlight module according to a second embodiment of the present invention;
fig. 4 is a cross-sectional view of a liquid crystal display according to a third embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in fig. 1, the backlight assembly according to the present embodiment includes a heat sink 10, a light bar 20, a light guide plate 30, and an extrusion member 40. Wherein, the heat sink 10 includes a first fixing plate 12 and a second fixing plate 13 disposed to face each other and a third fixing plate 11 connected to the same side of the first fixing plate 12 and the second fixing plate 13, i.e., the heat sink 10 has a U-shaped structure. The extrusion member 40 is disposed on the second fixing plate 13, the light guide plate 30 is disposed between the first fixing plate 12 and the extrusion member 40, and the extrusion member 40 serves to extrude the light guide plate 30 such that the light guide plate 30 is fixed on the first fixing plate 12. The light bar 20 is mounted on the third fixing plate 11 and faces the light incident surface of the light guide plate 30. Like this, under extruded article 40's extrusion effect, light guide plate 30 is fixed on first fixed plate 12 steadily for relative position between light guide plate 30 and the lamp strip 20 is fixed steadily, the displacement space has been reduced, thereby reach and improve the income light precision, reduce the light leak in a poor light, reduce the energy consumption, improve module class purpose in a poor light, the frame of gluing has also been saved simultaneously, directly utilize heat sink 10 to fix lamp strip 20 and light guide plate 30, can also dispel the heat to the heat that lamp strip 20 produced.
As a preferred embodiment, the pressing member 40 is a screw, the second fixing plate 13 is opened with a second through hole 13a, one end of the pressing member 40 is screwed with the second through hole 13a, the other end of the pressing member 40 presses the light guide plate 30, and the pressing member 40 is tightened to realize stable fixing of the light guide plate 30.
Specifically, the backlight module further includes a pressing strip 50, wherein the pressing strip 50 is disposed between the extrusion member 40 and the light guide plate 30, such that the extrusion member 40 extrudes the pressing strip 50 to drive the pressing strip 50 to extrude the light guide plate 30. On one hand, the arrangement of the pressing strip 50 can prevent the extrusion piece 40 from directly contacting the light guide plate 30 to damage the light guide plate 30; on the other hand, the setting of the pressing strip 50 enables the stress of the light guide plate 30 to be more uniform, and the light guide plate 30 is more stably fixed on the first fixing plate 12, so that the relative position between the light guide plate 30 and the light bar 20 is more stable.
Furthermore, the position of the pressing strip 50 corresponding to the screw is provided with a blind hole, and the screw is in threaded connection with the blind hole, so that the screw is in threaded connection with the second through hole 13a and the blind hole, the connection between the screw and the pressing strip is more stable, and the positioning of the pressing strip 50 is more accurate.
Further, as shown in fig. 2, the backlight module further includes a positioning column 60, the positioning column 60 is fixed on the second fixing plate 13, and the positioning column 60 is disposed on the pressing strip 50 in a penetrating manner. The layering 50 can be along the extrusion direction of extruded article 40 for reference column 60 activity, on the one hand, carries out prepositioning to layering 50 through reference column 60, guarantees that the initial position of layering 50 is accurate, and on the other hand, through reference column 60's limiting displacement, can prevent that extruded article 40 from promoting the process of layering 50, layering 50 takes place the skew in other directions, guarantees that the location of layering 50 is accurate to guarantee that the location of light guide plate 30 is accurate.
As a preferred embodiment, the pressing strip 50 is provided with a plurality of first through holes 51, the number of the positioning columns 60 is a plurality, and each positioning column 60 is in clearance fit with the corresponding first through hole 51, so that pre-positioning of the pressing strip 60 is realized, and the pressing strip 50 is ensured not to deviate in the moving process.
As a preferred embodiment, the backlight module further includes a back plate 70, a reflective sheet 80 and an optical film 90, wherein the back plate 70 is disposed between the pressing strip 50 and the light guide plate 30, and the reflective sheet 80 is disposed between the light guide plate 30 and the first fixing plate 12.
Further, the backlight module further includes a buffer sheet 91, the buffer sheet 91 is disposed between the optical film 90 and the first fixing plate 12, on one hand, the buffer sheet 91 can protect the optical film, and on the other hand, the buffer sheet 91 has a certain deformation amount, which can ensure that the light guide plate 30 is more stably fixed on the first fixing plate 12.
As a preferred embodiment, the buffer sheet 91 is adhered to the first fixing plate 12 by double-sided adhesive, and the light bar 20 is adhered to the third fixing plate 11 by double-sided adhesive.
As a preferred embodiment, the pressing member 40 is a screw, and the pressing member 40 is screw-coupled with the first through hole 13a to achieve stable pressing of the light guide plate 30.
Further, the heat sink 10 further includes a first bending plate 14 formed by bending the second fixing plate 13 and a second bending plate 15 formed by bending the first bending plate 14, wherein the second bending plate 15 is used for pre-positioning the back plate 70, the reflective sheet 80, the light guide plate 30 and the optical film 90. Specifically, the assembly process of the backlight module is as follows:
the back plate 70, the reflective sheet 80, the light guide plate 30 and the optical film 90 are sequentially stacked on the second bending plate 15, and then the back plate 70, the reflective sheet 80, the light guide plate 30 and the optical film 90 are simultaneously pushed, so that the back plate 70, the reflective sheet 80, the light guide plate 30 and the optical film 90 are inserted between the first fixing plate 12 and the second fixing plate 13, and then the extrusion member 40 is screwed, so that the extrusion member 40 pushes the back plate 70 until the back plate 70, the reflective sheet 80, the light guide plate 30 and the optical film 90 are stably fixed on the first fixing plate 12, thereby ensuring that the relative position between the light incident surface of the light guide plate 30 and the light bar 20 is stable and unchanged.
According to the backlight module disclosed by the invention, the extrusion piece is arranged, so that the light guide plate is stably fixed in the U-shaped heat sink under the pushing action of the extrusion piece, and the relative position between the light incident surface of the light guide plate and the light bar is stably fixed, so that the purposes of improving light incident precision, reducing backlight light leakage, reducing energy consumption and improving the backlight taste of the module are achieved, meanwhile, a rubber frame is omitted, and the narrow frame design of the backlight module is facilitated.
Example two
As shown in fig. 3, the difference between the backlight module according to the second embodiment and the backlight module according to the first embodiment is: the pressing member 40 of the second embodiment is an elastic member, such as a spring, the pressing member 40 is located between the second fixing plate 13 and the light guide plate 30, and both ends of the pressing member 40 elastically press the second fixing plate 13 and the light guide plate 30, respectively, so that the light guide plate 30 is stably fixed on the first fixing plate 12, and the relative position between the light guide plate 30 and the light bar 20 is stably fixed. The second fixing plate 13 in the second embodiment does not need to be provided with the second through hole 13 a. It should be noted that, except for the above differences, other structures of the backlight module of the second embodiment are the same as those of the backlight module of the first embodiment, and are not described herein again.
EXAMPLE III
As shown in fig. 4, the lcd according to the embodiment of the invention includes a front frame 200, a display panel 300 and the backlight module 100 of the first embodiment or the second embodiment, wherein the display panel 300 is disposed on the backlight module 100, and the front frame 200 covers the display panel 300. Through the pushing action of the extrusion piece, the relative position between the lamp strip and the light guide plate is stable and unchanged, the light incidence precision is improved, the glue frame is omitted, and the narrow frame design of the liquid crystal display is facilitated.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents, and that such changes and modifications are intended to be within the scope of the invention.

Claims (9)

1. A backlight module, comprising:
a heat sink (10) including a first fixing plate (12) and a second fixing plate (13) facing each other and a third fixing plate (11) connected to the same side of the first fixing plate (12) and the second fixing plate (13);
a light guide plate (30) disposed between the first fixing plate (12) and the second fixing plate (13);
the light bar (20) is arranged on the third fixing plate (11) and faces the light incident surface of the light guide plate (30);
a pressing member (40) disposed on the second fixing plate (13), the pressing member (40) pressing the light guide plate (30) to fix the light guide plate (30) with the first fixing plate (12);
and a pressing strip (50) disposed between the pressing member (40) and the light guide plate (30), the pressing member (40) pressing the pressing strip (50) so that the pressing strip (50) presses the light guide plate (30).
2. The backlight module according to claim 1, further comprising a positioning post (60) fixed on the second fixing plate (13), wherein the positioning post (60) is inserted into the pressing bar (50).
3. The backlight module according to claim 1, further comprising a back plate (70) and a reflective sheet (80), wherein the back plate (70) is disposed between the bead (50) and the light guide plate (30), and the reflective sheet (80) is disposed between the back plate (70) and the light guide plate (30).
4. The backlight module according to claim 1, further comprising a buffer sheet (91), wherein the buffer sheet (91) is disposed between the light guide plate (30) and the first fixing plate (12).
5. The backlight module as claimed in claim 4, wherein the buffer sheet (91) is adhered to the first fixing plate (12).
6. The backlight module according to claim 1, wherein the pressing member (40) is a screw, the second fixing plate (13) has a second through hole (13a), and the pressing member (40) is screwed into the second through hole (13a) to press the light guide plate (30).
7. The backlight module according to claim 1 or 2, wherein the pressing member (40) is a screw, the second fixing plate (13) has a second through hole (13a), and the pressing member (40) is screwed into the second through hole (13a) to press the pressing bar (50).
8. A backlight module according to claim 1, wherein the pressing member (40) is an elastic member, the pressing member (40) is located between the second fixing plate (13) and the light guide plate (30), and both ends of the pressing member (40) elastically press the second fixing plate (13) and the light guide plate (30), respectively.
9. A liquid crystal display, comprising a front frame (200), a display panel (300) and the backlight module (100) of any one of claims 1 to 8, wherein the display panel (300) is disposed on the backlight module (100), and the front frame (200) covers the display panel (300).
CN201810579894.2A 2018-06-07 2018-06-07 Liquid crystal display and backlight module thereof Active CN108732821B (en)

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CN108732821B true CN108732821B (en) 2021-07-16

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Publication number Priority date Publication date Assignee Title
CN110928052A (en) * 2019-12-25 2020-03-27 中航华东光电有限公司 Liquid crystal display backlight module

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104728788A (en) * 2013-12-19 2015-06-24 纬创资通股份有限公司 Backlight module
CN205691907U (en) * 2016-05-18 2016-11-16 京东方科技集团股份有限公司 Backlight module and display device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102798042B (en) * 2012-07-31 2014-09-17 深圳市华星光电技术有限公司 Backlight module and liquid crystal display
CN103047588B (en) * 2013-01-06 2015-09-02 深圳市华星光电技术有限公司 Backlight module and liquid crystal display thereof
CN105759505B (en) * 2016-05-13 2019-03-26 青岛海信电器股份有限公司 A kind of backlight module and liquid crystal display
CN206093550U (en) * 2016-09-20 2017-04-12 苏州茂立光电科技有限公司 Heat sink structure and backlight module and display used thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104728788A (en) * 2013-12-19 2015-06-24 纬创资通股份有限公司 Backlight module
CN205691907U (en) * 2016-05-18 2016-11-16 京东方科技集团股份有限公司 Backlight module and display device

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