CN116224483A - Dual-color light guide plate and Local dimming backlight module - Google Patents

Dual-color light guide plate and Local dimming backlight module Download PDF

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Publication number
CN116224483A
CN116224483A CN202310220965.0A CN202310220965A CN116224483A CN 116224483 A CN116224483 A CN 116224483A CN 202310220965 A CN202310220965 A CN 202310220965A CN 116224483 A CN116224483 A CN 116224483A
Authority
CN
China
Prior art keywords
guide plate
light guide
double
color light
backlight module
Prior art date
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Pending
Application number
CN202310220965.0A
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Chinese (zh)
Inventor
黄磊
姚君乐
罗增昌
刘三妹
叶海霞
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.)
Huizhou Wai Chi Electronics Co ltd
Original Assignee
Huizhou Wai Chi Electronics Co ltd
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Filing date
Publication date
Application filed by Huizhou Wai Chi Electronics Co ltd filed Critical Huizhou Wai Chi Electronics Co ltd
Priority to CN202310220965.0A priority Critical patent/CN116224483A/en
Publication of CN116224483A publication Critical patent/CN116224483A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—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
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—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
    • 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
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133606—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
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

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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)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention discloses a double-color light guide plate and a Local dimming backlight module, which comprises a lamp cup layer and a lens layer, wherein the lens layer is arranged on the front side of the lamp cup layer, the lamp cup layer and the lens layer are integrally formed by injection molding, the lamp cup layer is formed by injection molding of white plastic, and the lens layer is formed by injection molding of transparent plastic; the lamp cup layer comprises a plurality of lamp cups, the lens layer comprises a plurality of lenses, and a lens is arranged on the front side of each lamp cup. The Local dimming backlight module comprises a rear mounting groove, a light-emitting assembly, a double-color light guide plate, a diaphragm assembly and a front fixing frame, wherein the double-color light guide plate is the double-color light guide plate; the light-emitting assembly comprises a lamp panel, the lamp panel is matched with the double-color light guide plate, a plurality of Mini LED light sources are arranged on the lamp panel, and each Mini LED light source is respectively arranged in one lamp cup. The invention is used in the area light control liquid crystal display.

Description

Dual-color light guide plate and Local dimming backlight module
Technical Field
The invention relates to the technical field of backlight modules, in particular to a double-color light guide plate and a Local dimming backlight module.
Background
The liquid crystal display (Liquid Crystal Display, LCD) mainly comprises a liquid crystal display panel and a backlight module, wherein the backlight module is arranged on the back of the liquid crystal display panel to provide white light for the liquid crystal display panel, and the liquid crystal display panel converts the white light emitted by the backlight module into a five-color six-color pattern on the front side of the liquid crystal display panel, so that the display function of the liquid crystal display is realized, and therefore, the backlight module is an important component of the liquid crystal display. The backlight module comprises a direct type backlight module and a side-in type backlight module, wherein the direct type backlight module is used for arranging light sources such as LEDs at the bottom of the inner side of the back plate, the light sources such as LEDs can radiate heat through the bottom of the inner side of the whole back plate when the direct type backlight module works, the radiating effect is better than that of the side-in type backlight module, and the cost of the direct type backlight module is relatively lower, so that the liquid crystal display often adopts the direct type backlight module. With the development of technology, a Local dimming technology (Local dimming) appears, and the Local dimming technology can control the intensity of the light-emitting brightness at the Local position of the backlight module, so that the display effect of the liquid crystal display can be better controlled. The backlight module of the regional light control technology generally adopts a direct type backlight module, but all light sources in the existing Local dimming backlight module are in the same space, and are easily influenced by the light emission of other nearby light sources when the Local light source light-emitting brightness is controlled, so that the regional light control effect of the Local dimming backlight module is influenced, and the intensity adjustment control effect of the Local position light-emitting brightness of the backlight module is poor. Therefore, the existing Local dimming backlight module is often provided with the reflecting structures such as the reflecting cover and the like to isolate the adjacent light sources, so that the Local dimming backlight module regional dimming effect is optimized, but the Local dimming backlight module is required to be specially provided with the reflecting structures such as the reflecting cover and the like, the complexity of the backlight module is increased, the production and the assembly of the backlight module are inconvenient, and the use stability of the backlight module is affected. For example, in the backlight module of the patent document CN201920062881.8, a direct type backlight module with a reflector needs to be specially provided with a reflector, which increases the complexity of the backlight module, is inconvenient for production and assembly of the backlight module, and affects the use stability of the backlight module.
Disclosure of Invention
The invention solves the technical problems that the existing regional light control backlight module needs to be specially provided with a reflecting structure such as a reflecting shade and the like, the complexity of the backlight module is increased, the production and the assembly of the backlight module are inconvenient, and the use stability of the backlight module is affected.
In order to solve the technical problems, the technical scheme of the invention is as follows: the double-color light guide plate comprises a lamp cup layer and a lens layer, wherein the lens layer is arranged on the front side of the lamp cup layer, the lamp cup layer and the lens layer are integrally formed by injection molding, the lamp cup layer is formed by white plastic injection molding, and the lens layer is formed by transparent plastic injection molding; the lamp cup layer comprises a plurality of lamp cups, the lens layer comprises a plurality of lenses, and a lens is arranged on the front side of each lamp cup.
Further, each of the lenses is a convex lens.
Further, each lamp cup is of a square structure.
A Local dimming backlight module utilizing the double-color light guide plate, comprising a rear mounting groove, a light-emitting component, the double-color light guide plate, a diaphragm component and a front fixing frame, wherein the double-color light guide plate is the double-color light guide plate according to any one of claims; the light emitting assembly is fixed at the bottom of the inner side of the rear mounting groove, the double-color light guide plate is arranged at the position in front of the light emitting assembly in the rear mounting groove, the diaphragm assembly is overlapped on the double-color light guide plate, the front fixing frame is fixed on the rear mounting groove, and the front fixing frame presses and fixes the light emitting assembly, the double-color light guide plate and the diaphragm assembly in the rear mounting groove; the light-emitting assembly comprises a lamp panel, the lamp panel is matched with the double-color light guide plate, a plurality of Mini LED light sources are arranged on the lamp panel, and each Mini LED light source is respectively arranged in one lamp cup.
Further, the light emitting assembly further comprises a reflecting sheet, and the reflecting sheet is arranged on the front side of the lamp panel.
Further, the reflector plate sets up a plurality ofly, all set up a reflector plate around every Mini LED light source of lamp plate, each the reflector plate is all adhered and is fixed in the lamp plate front side through reflector plate bonding double sided adhesive.
Further, the diaphragm assembly comprises a light scattering film, a light intensifying film and a peep-proof film, and the light scattering film, the light intensifying film and the peep-proof film are sequentially overlapped on the double-color light guide plate.
Further, the front side of the double-color light guide plate is provided with a positioning clamping block, the light scattering film, the light intensifying film and the peep-proof film are all provided with positioning clamping holes, the positioning clamping block is matched with the positioning clamping holes, and the positioning clamping block is inserted into the positioning clamping holes.
Furthermore, the light-scattering film, the light-intensifying film and the peep-proof film are all adhered and fixed on the double-color light guide plate through the film fixing double-sided adhesive tape.
Further, the two-color light guide plate outside is provided with spacing trip, be provided with spacing draw-in groove on the back mounting groove inside wall, spacing trip and spacing draw-in groove looks adaptation, spacing trip joint is fixed in spacing draw-in groove.
The double-color light guide plate has the advantages that: the bicolor light guide plate comprises a lamp cup layer and a lens layer, wherein the lens layer is arranged on the front side of the lamp cup layer, the lamp cup layer comprises a plurality of lamp cups, the lens layer comprises a plurality of lenses, the lamp cup layer is formed by white plastic injection, the lens layer is formed by transparent plastic injection, and therefore the interval between adjacent Mini LED light sources of the backlight module can be kept away through the white lamp cup, the intensity of the luminous brightness at the local position of the backlight module is difficult to control due to mutual light channeling of the adjacent Mini LED light sources of the backlight module, so that the luminous effect of the regional light control backlight module can be better controlled, the lamp cup layer and the lens layer of the light guide plate are integrally formed by double-color injection, regional light control can be realized by the bicolor light guide plate which is manufactured at one time, the Mini LED point light source can be converted into a surface light source, the bicolor light guide plate is easy to manufacture, and the production and assembly of the backlight module are convenient, and the use is stable.
The Local dimming backlight module has the beneficial effects that: the Local dimming backlight module comprises a rear mounting groove, a light-emitting assembly, a double-color light guide plate, a diaphragm assembly and a front fixing frame. The regional light control can be realized through the double-color light guide plate, and the conversion of the Mini LED point light source into the surface light source can be realized, so that the Local dimming backlight module has the advantages of simple structure, easy production and assembly and stable use. The uniformity and the brightness of the light emission of the Local dimming backlight module can be further improved through the diaphragm assembly. The luminous component, the double-color light guide plate and the diaphragm component can be installed together to form an integral backlight module through the rear mounting groove and the front fixing frame, so that the use stability of the backlight module is improved.
Drawings
FIG. 1 is a schematic perspective view of a dual-color light guide plate according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of the portion A in FIG. 1;
FIG. 3 is a schematic perspective view of another angle of a dual-color light guide plate according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of the portion B in FIG. 3;
FIG. 5 is a schematic view of a structure of a side of a cup layer of a dual-color light guide plate according to an embodiment of the present invention;
fig. 6 is a schematic view illustrating a longitudinal cross-sectional structure of a bi-color light guide plate according to an embodiment of the present invention;
FIG. 7 is an enlarged schematic view of the portion C in FIG. 6;
fig. 8 is an exploded schematic view of a Local dimming backlight module (including a surface adhesive and a surface protective film) according to an embodiment of the present invention;
fig. 9 is an exploded view of a Local dimming backlight module (excluding a surface adhesive and a surface protective film) according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a Local dimming backlight module light board according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a Local dimming backlight module reflector adhered on a reflector adhesive double sided tape in an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a light diffusing film, a light intensifying film and a peep-proof film of a Local dimming backlight module according to an embodiment of the present invention.
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limiting the present patent.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and examples for the understanding of those skilled in the art.
Example 1
Referring to fig. 1 to 7, a dual-color light guide plate is formed by dual-color injection molding and is used in a Local dimming backlight module. The bicolor light guide plate comprises a lamp cup layer 11 and a lens layer 12, wherein the lens layer 12 is arranged on the front side of the lamp cup layer 11, and the lamp cup layer 11 and the lens layer 12 of the light guide plate are integrally formed by bicolor injection molding. The lens layer 12 is formed by injection molding of transparent plastic, the lens layer 12 is provided with a plurality of lenses 121, the lamp cup layer 11 is provided with a plurality of lamp cups 111, and the front side of each lamp cup 111 is provided with one lens 121. Each lamp cup is respectively provided with a Mini LED light source of the backlight module, and spot light emitted by the Mini LED light source of the backlight module is converted into a parallel-luminous area light source through the lens layer 12, so that the luminous uniformity of the backlight module can be improved; the lamp cup layer 11 is formed by white plastic injection molding, so that adjacent Mini LED light sources of the backlight module can be separated through the white lamp cup, the situation that the intensity of the luminous brightness at the local position of the backlight module is difficult to control due to mutual light channeling of the adjacent Mini LED light sources of the backlight module is avoided, and the luminous effect of the regional light control backlight module can be better controlled.
The double-color light guide plate comprises a lamp cup layer 11 and a lens layer 12, wherein the lens layer 12 is arranged on the front side of the lamp cup layer 11, the lamp cup layer 11 comprises a plurality of lamp cups 111, the lens layer 12 comprises a plurality of lenses 121, the lamp cup layer 11 is formed by white plastic injection molding, and the lens layer 12 is formed by transparent plastic injection molding, so that the adjacent Mini LED light sources of the backlight module can be separated through the white lamp cups, the situation that the intensity of the luminous brightness at the local position of the backlight module is difficult to control due to mutual light channeling of the adjacent Mini LED light sources of the backlight module is avoided, and the luminous effect of the regional light control backlight module can be better controlled; and the lamp cup layer 11 and the lens layer 12 of the light guide plate are integrally injection molded by double-shot injection molding, so that the double-shot light guide plate is easy to mold and manufacture.
Referring to fig. 6 and 7, each lens 121 adopts a convex lens, so that light emitted by the Mini LED light source of the backlight module is converted into parallel light after passing through the lens 121 and then emitted from the backlight module, so that the brightness of the backlight module can be improved, and the parallel light is emitted from the backlight module to the liquid crystal display panel, which is beneficial to improving the brightness of the liquid crystal display. The lamp cup 111 may have a cylindrical structure or a square structure, and the lamp cup 111 shown in this embodiment has a square structure.
Referring to fig. 1 to 7, the bicolor light guide plate of the embodiment is manufactured by bicolor injection molding, the lamp cup layer is manufactured by injection molding of white plastic material, and the lens layer is manufactured by injection molding of transparent plastic material; the temperature resistance of the plastic material adopted by the injection molding of the lamp cup layer is higher than that of the plastic material adopted by the injection molding of the lens layer, so that the double-shot injection integrated molding of the lamp cup layer and the lens layer is realized conveniently. During double-color injection molding, a mold is used for injection molding of a lamp cup layer with relatively high material temperature, and white plastic materials are used for injection molding; then the mould is rotated 180 degrees, and the transparent plastic material is used for injection molding of the lens layer with lower injection temperature. When the bicolor light guide plate is used, the bicolor light guide plate is arranged on the front side of a lamp panel in the backlight module, a Mini LED light source is arranged in each lamp cup 111, the Mini LED light source is arranged on the focus of a lens 121, point light emitted by the Mini LED light source of the backlight module is converted into a parallel luminous surface light source through the lens 121 of the lens layer 12, and therefore a Local dimming backlight module with uniform luminous performance is formed. When the bicolor light guide plate is used for regional light control of the backlight module, the adjacent Mini LED light sources are spaced by the white lamp cups, so that the luminous effect of the regional light control backlight module can be better controlled.
Example two
Referring to fig. 1 to 12, a Local dimming backlight module using a dual-color light guide plate in the first embodiment includes a rear mounting groove 2, a light emitting component 3, a dual-color light guide plate 1, a diaphragm component 4 and a front fixing frame 5, wherein the dual-color light guide plate 1 is the dual-color light guide plate in the first embodiment. The rear mounting groove 2 and the front fixing frame 5 are the mounting support structures of the Local dimming backlight module, and the light emitting component 3, the double-color light guide plate 1 and the diaphragm component 4 are all mounted in the rear mounting groove 2 and are pressed and fixed in the rear mounting groove 2 through the front fixing frame 5. The rear mounting groove 2 adopts a metal groove-shaped structure with an open front side, and the front fixing frame 5 adopts an injection molding plastic frame. The luminous component 3 is fixed at the bottom of the inner side of the rear mounting groove 2, the double-color light guide plate 1 is arranged at the position in front of the luminous component 3 in the rear mounting groove 2, the diaphragm component 4 is overlapped on the double-color light guide plate 1, the front fixing frame 5 is fixed on the rear mounting groove 2, and the front fixing frame 5 presses and fixes the luminous component 3, the double-color light guide plate 1 and the diaphragm component 4 in the rear mounting groove 2. The light emitting assembly 3 comprises a lamp plate 31, the lamp plate 31 is matched with the bicolor light guide plate 1, a plurality of Mini LED light sources 311 are arranged on the lamp plate 31, the size, the appearance, the position and the number of the Mini LED light sources 311 on the lamp plate 31 are matched with those of the lamp cups 111 and the lenses 121 on the bicolor light guide plate 1, each Mini LED light source 311 is respectively arranged in one lamp cup 111, and each lens 121 respectively converts light rays emitted by the Mini LED light sources 311 in the lamp cup 111 at the rear side into parallel light rays and emits the parallel light rays to the front side of the backlight module.
Referring to fig. 8 to 11, the light emitting assembly 3 further includes a reflective sheet 32, where the reflective sheet 32 is disposed on the front side of the lamp panel 31, and more light emitted from the lamp panel 31 can be reflected to the front side of the backlight module by the reflective sheet 32, so as to improve the brightness of the backlight module and reduce the energy consumption of the backlight module. The reflecting sheets 32 are arranged in plurality, and the reflecting sheets 32 are arranged around each Mini LED light source of the lamp panel 31, namely, each lens 121 and the rear side of the lamp cup 111 are provided with one reflecting sheet 32, so that the double-color light guide plate 1 can be supported and installed on the lamp panel 31 conveniently, and the stability of the double-color light guide plate 1 installed on the lamp panel 31 is improved. Each reflector plate 32 is adhered and fixed on the front side of the lamp panel 31 through a reflector plate adhesive double faced adhesive tape 33, and the reflector plate adhesive double faced adhesive tape 33 is of an integral structure, so that the double-color light guide plate 1 can be adhered on the lamp panel 31 through the reflector plate adhesive double faced adhesive tape 33, the stability of the double-color light guide plate 1 on the lamp panel 31 is improved, the double-color light guide plate 1 can be adhered and the reflector plate 32 can be adhered through one reflector plate adhesive double faced adhesive tape 33, and the production and the assembly of the Local dimming backlight module are facilitated.
Referring to fig. 1 to 12, in the production and assembly of the Local dimming backlight module of the present embodiment, a lamp panel 31 is adhered and fixed to the bottom of the inner side of the rear mounting groove 2 through a heat-conducting double sided tape 34, then a double-color light guide plate 1 and each reflective sheet 32 are adhered and fixed to the lamp panel 31 through a reflective sheet adhering double sided tape 33, then a membrane assembly 4 is mounted on the double-color light guide plate 1, finally a front fixing frame 5 is fixed to the rear mounting groove 2, and a light emitting assembly 3, the double-color light guide plate 1 and the membrane assembly 4 are pressed and fixed in the rear mounting groove 2 through the front fixing frame 5. The Local dimming backlight module is used as a backlight module of a liquid crystal display.
Example III
Referring to fig. 1 to 12, the Local dimming backlight module of the present embodiment is the same as that of the second embodiment, and the structure of the diaphragm assembly 4 is improved based on the second embodiment, and the same points as that of the second embodiment are referred to as the second embodiment, and the improvement is described below.
Referring to fig. 1 to 4, 8, 9 and 12, the film assembly 4 includes a light diffusing film 41, a light intensifying film 42 and a peep preventing film 43, where the light diffusing film 41, the light intensifying film 42 and the peep preventing film 43 are sequentially stacked on the two-color light guide plate 1, so that the uniformity of light emission of the backlight module can be improved through the light diffusing film 41, the brightness of light emission of the backlight module can be improved through the light intensifying film 42, and the privacy of the display content of the liquid crystal display when the backlight module is installed on the liquid crystal display is improved through the peep preventing film 43.
Referring to fig. 1 to 4, 8, 9 and 12, the front side of the bi-color light guide plate 1 is provided with a positioning clamping block 13, the light-scattering film 41, the light-intensifying film 42 and the peep-proof film 43 are all provided with positioning clamping holes 44, the positioning clamping block 13 is matched with the positioning clamping holes 44, that is, the size, the shape, the position and the number of the positioning clamping blocks 13 are consistent with those of the positioning clamping holes 44, so that the positioning clamping blocks 13 can be just inserted into the positioning clamping holes 44, and the light-scattering film 41, the light-intensifying film 42 and the peep-proof film 43 are positioned and installed on the bi-color light guide plate 1. In this embodiment, the two sides and the middle position of the long side of the bi-color light guide plate 1 are provided with the positioning clamping blocks 13, and the two sides and the middle position of the long side of the light-diffusing film 41, the light-intensifying film 42 and the peep-proof film 43 are provided with the open positioning clamping holes 44, so that the light-diffusing film 41, the light-intensifying film 42 and the peep-proof film 43 are positioned and installed on the bi-color light guide plate 1.
Referring to fig. 8 and 9, in order to further enhance the stability of fixing the light-diffusing film 41, the light-intensifying film 42 and the peep-preventing film 43 on the bi-color light guide plate 1, the light-diffusing film 41, the light-intensifying film 42 and the peep-preventing film 43 are all adhered and fixed on the bi-color light guide plate 1 by the film fixing double sided tape 45. Three film fixing double-sided tapes 45 are provided, the light diffusion film 41 is fixed on the double-color light guide plate 1 by bonding one film fixing double-sided tape 45, the brightness enhancement film 42 is fixed on the light diffusion film 41 by bonding one film fixing double-sided tape 45, and the peep prevention film 43 is fixed on the brightness enhancement film 42 by bonding one film fixing double-sided tape 45.
Referring to fig. 8 and 9, in order to enhance the stability of the installation of the bi-color light guide plate 1 on the rear installation groove 2, a limiting hook 14 is disposed on the outer side of the bi-color light guide plate 1, a limiting groove (not shown in the figure) is disposed on the inner side wall of the rear installation groove 2, and the limiting hook 14 is adapted to the limiting groove, that is, the size, the shape, the position and the number of the limiting hooks 14 are matched with the size, the shape, the position and the number of the limiting grooves, so that the limiting hook 14 can be just fastened and fixed in the limiting groove, and the bi-color light guide plate 1 is fastened on the inner side wall of the rear installation groove 2, thereby improving the stability of the installation of the bi-color light guide plate 1 on the rear installation groove 2 and further enhancing the stability of the backlight module.
Referring to fig. 8, when the local dimming backlight module is assembled, after the front fixing frame 5 is fixedly installed on the rear mounting groove 2, a layer of protective film 7 is fixedly adhered on the front fixing frame 5 through the double faced adhesive tape 6 to protect the diaphragm assembly 4, so that the diaphragm assembly 4 is prevented from being scratched and damaged. When the Local dimming backlight module is used, the protective film 7 is torn off.
Referring to fig. 1 to 12, in the process of producing and assembling the Local dimming backlight module of the present embodiment, the lamp panel 31 is adhered and fixed to the bottom of the inner side of the rear mounting groove 2 through the heat-conducting double sided tape 34, then the double-color light guide plate 1 and each reflective sheet 32 are adhered and fixed to the lamp panel 31 through the reflective sheet adhering double sided tape 33, then the light-diffusing film 41, the light-intensifying film 42 and the peep-proof film 43 are sequentially mounted on the double-color light guide plate 1, finally the front fixing frame 5 is fixed to the rear mounting groove 2, and the light-emitting component 3, the double-color light guide plate 1 and the film component 4 are pressed and fixed in the rear mounting groove 2 through the front fixing frame 5. The Local dimming backlight module is used as a backlight module of a liquid crystal display.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. A bi-color light guide plate, characterized in that: the LED lamp comprises a lamp cup layer (11) and a lens layer (12), wherein the lens layer (12) is arranged on the front side of the lamp cup layer (11), the lamp cup layer (11) and the lens layer (12) are integrally formed by injection molding, the lamp cup layer (11) is formed by white plastic injection molding, and the lens layer (12) is formed by transparent plastic injection molding; the lamp cup layer (11) comprises a plurality of lamp cups (111), the lens layer (12) comprises a plurality of lenses (121), and one lens (121) is arranged on the front side of each lamp cup (111).
2. The bi-color light guide plate of claim 1, wherein: each of the lenses (121) is a convex lens.
3. The two-color light guide plate according to claim 2, wherein: each lamp cup (111) is of a square structure.
4. A Local dimming backlight module using the dual-color light guide plate of any one of claims 1 to 3, wherein: the light guide plate comprises a rear mounting groove (2), a light emitting component (3), a double-color light guide plate (1), a membrane component (4) and a front fixing frame (5), wherein the double-color light guide plate (1) is the double-color light guide plate according to any one of claims 1-3; the light emitting assembly (3) is fixed at the bottom of the inner side of the rear mounting groove (2), the double-color light guide plate (1) is arranged at the position in front of the light emitting assembly (3) in the rear mounting groove (2), the diaphragm assembly (4) is overlapped on the double-color light guide plate (1), the front fixing frame (5) is fixed on the rear mounting groove (2), and the front fixing frame (5) presses and fixes the light emitting assembly (3), the double-color light guide plate (1) and the diaphragm assembly (4) in the rear mounting groove (2); the light emitting assembly (3) comprises a lamp panel (31), the lamp panel (31) is matched with the double-color light guide plate (1), a plurality of Mini LED light sources (311) are arranged on the lamp panel (31), and each Mini LED light source (311) is respectively arranged in one lamp cup (111).
5. The Local dimming backlight module of claim 4, wherein: the light emitting assembly (3) further comprises a reflecting sheet (32), and the reflecting sheet (32) is arranged on the front side of the lamp panel (31).
6. The Local dimming backlight module of claim 5, wherein: the LED lamp comprises a lamp panel (31), a plurality of reflecting sheets (32), a reflecting sheet (32) and a double faced adhesive tape (33) for bonding the reflecting sheets (32), wherein the reflecting sheets (32) are arranged around each Mini LED light source of the lamp panel (31), and the reflecting sheets are bonded and fixed on the front side of the lamp panel (31) through the reflecting sheet bonding double faced adhesive tape (33).
7. The Local dimming backlight module of claim 6, wherein: the film assembly (4) comprises a light scattering film (41), a light intensifying film (42) and a peep-proof film (43), and the light scattering film (41), the light intensifying film (42) and the peep-proof film (43) are sequentially stacked on the double-color light guide plate (1).
8. The Local dimming backlight module of claim 7, wherein: the double-color light guide plate is characterized in that a positioning clamping block (13) is arranged on the front side of the double-color light guide plate (1), positioning clamping holes (44) are formed in the light scattering film (41), the light intensifying film (42) and the peep-proof film (43), the positioning clamping block (13) is matched with the positioning clamping holes (44), and the positioning clamping block (13) is inserted into the positioning clamping holes (44).
9. The Local dimming backlight module of claim 8, wherein: the light-scattering film (41), the light-intensifying film (42) and the peep-proof film (43) are all adhered and fixed on the double-color light guide plate (1) through a film fixing double-sided adhesive tape (45).
10. The Local dimming backlight module of claim 9, wherein: the double-color light guide plate is characterized in that a limiting clamp hook (14) is arranged on the outer side of the double-color light guide plate (1), a limiting clamp groove is formed in the inner side wall of the rear mounting groove (2), the limiting clamp hook (14) is matched with the limiting clamp groove, and the limiting clamp hook (14) is clamped and fixed in the limiting clamp groove.
CN202310220965.0A 2023-03-08 2023-03-08 Dual-color light guide plate and Local dimming backlight module Pending CN116224483A (en)

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CN101188261A (en) * 2007-12-17 2008-05-28 天津理工大学 LED with high dispersion angle and surface light source
CN209514253U (en) * 2019-01-15 2019-10-18 惠州伟志电子有限公司 A kind of down straight aphototropism mode set with reflector
CN210294753U (en) * 2019-08-01 2020-04-10 河源鸿祺电子技术有限公司 High-brightness dodging backlight source structure
CN111323966A (en) * 2020-03-05 2020-06-23 惠州市隆利科技发展有限公司 Direct type backlight device and electronic equipment
CN112631025A (en) * 2020-12-30 2021-04-09 深圳市隆利科技股份有限公司 Direct type backlight device
CN113281937A (en) * 2021-01-25 2021-08-20 深圳市隆利科技股份有限公司 Direct type Mini-LED backlight module with mura compensation
CN214669983U (en) * 2021-05-11 2021-11-09 伟志光电（深圳）有限公司 Side-in backlight module with internally-connected front frame
CN215265334U (en) * 2021-03-19 2021-12-21 佛山市国星光电股份有限公司 Backlight module
CN218122411U (en) * 2022-09-17 2022-12-23 伟志光电（深圳）有限公司 Light source lens structure and backlight module with same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101188261A (en) * 2007-12-17 2008-05-28 天津理工大学 LED with high dispersion angle and surface light source
CN209514253U (en) * 2019-01-15 2019-10-18 惠州伟志电子有限公司 A kind of down straight aphototropism mode set with reflector
CN210294753U (en) * 2019-08-01 2020-04-10 河源鸿祺电子技术有限公司 High-brightness dodging backlight source structure
CN111323966A (en) * 2020-03-05 2020-06-23 惠州市隆利科技发展有限公司 Direct type backlight device and electronic equipment
CN112631025A (en) * 2020-12-30 2021-04-09 深圳市隆利科技股份有限公司 Direct type backlight device
CN113281937A (en) * 2021-01-25 2021-08-20 深圳市隆利科技股份有限公司 Direct type Mini-LED backlight module with mura compensation
CN215265334U (en) * 2021-03-19 2021-12-21 佛山市国星光电股份有限公司 Backlight module
CN214669983U (en) * 2021-05-11 2021-11-09 伟志光电（深圳）有限公司 Side-in backlight module with internally-connected front frame
CN218122411U (en) * 2022-09-17 2022-12-23 伟志光电（深圳）有限公司 Light source lens structure and backlight module with same

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