WO2017156902A1 - 量子点背光模组及液晶电视 - Google Patents

量子点背光模组及液晶电视 Download PDF

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Publication number
WO2017156902A1
WO2017156902A1 PCT/CN2016/085867 CN2016085867W WO2017156902A1 WO 2017156902 A1 WO2017156902 A1 WO 2017156902A1 CN 2016085867 W CN2016085867 W CN 2016085867W WO 2017156902 A1 WO2017156902 A1 WO 2017156902A1
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WIPO (PCT)
Prior art keywords
quantum dot
light source
module
guide plate
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/CN2016/085867
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English (en)
French (fr)
Inventor
钟燮和
潘俊
陈细俊
许怀书
周兵
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.)
Shenzhen TCL New Technology Co Ltd
Original Assignee
Shenzhen TCL New Technology Co Ltd
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Filing date
Publication date
Application filed by Shenzhen TCL New Technology Co Ltd filed Critical Shenzhen TCL New Technology Co Ltd
Publication of WO2017156902A1 publication Critical patent/WO2017156902A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • 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
    • G02B6/0073—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
    • G02F1/133606—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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular to a quantum dot backlight module and a liquid crystal television using the same.
  • a conventional direct-type quantum dot backlight module is provided with a blue LED light source 12 on a PCB board 10.
  • the light of the blue LED light source 12 expands the emission area through the diffusion plate 14, and then excites the quantum dot fluorescent film 16 to generate a high color. Domain white light.
  • the blue LED light source 12 and the quantum dot fluorescent film 16 have a large distance, the excitation efficiency is lowered; and the light direction of the blue LED light source 12 is discrete, and the light in different directions is excited by the upper quantum dot fluorescent film 16 to cause color failure. Uniform phenomenon; and with the diffusion of the light source, the area of the quantum dot fluorescent film 16 needs to be increased, so that the cost of the quantum dot backlight module is high, and the thickness of the liquid crystal television is also large due to the large spacing between the PCB board 10 and the diffusion plate 14. Larger.
  • the present invention aims to solve at least one of the technical problems in the related art to some extent.
  • the present invention provides a quantum dot backlight module, which aims to reduce the thickness of the quantum dot backlight module, improve picture quality, and save cost.
  • the present invention provides a quantum dot backlight module including a plurality of quantum dot surface light source modules, each of which includes a light source, a light guide plate group, a reflective block, and a quantum dot phosphor module.
  • the light guide plate group is provided with a through hole
  • the reflective block is embedded in the through hole
  • the light source is disposed opposite to the reflective block
  • the quantum dot phosphor module is disposed on the light source and the reflective block between.
  • the light guide plate set includes a light guide plate and a reflective sheet attached to a surface of the light guide plate, the reflective sheet faces the quantum dot phosphor module, the through hole penetrates the light guide plate and the a reflective sheet, the reflective block being disposed in the light guide plate.
  • the reflective block comprises a plane facing a quantum dot phosphor module, and the curved surface is flush with a surface of the light guide plate facing away from the reflective sheet.
  • the quantum dot phosphor module comprises two oppositely disposed package plates, and a quantum dot phosphor layer filled between the package plates.
  • one end of the quantum dot phosphor module is embedded in the through hole, and the other end of the quantum dot phosphor module is attached to the light source.
  • the light source comprises an LED lamp holder and a plurality of light-emitting chips, and a side of the LED lamp holder facing the quantum dot phosphor module is provided with a groove, and the plurality of light-emitting chips are spaced apart from the groove. bottom.
  • the quantum dot phosphor module covers the groove.
  • a surface of the light guide plate that is adhered to the reflective sheet is provided with a dot.
  • the quantum dot backlight module further includes a PCB board and a diffusion board, wherein the plurality of quantum dot surface light source modules are disposed between the PCB board and the diffusion board, and the light source is attached to the PCB board .
  • Another object of the present invention is to provide a liquid crystal television comprising a quantum dot backlight module and a liquid crystal display panel, wherein the quantum dot backlight module is located on a light incident surface of the liquid crystal display panel, and the quantum dot backlight module
  • the method includes a plurality of quantum dot surface light source modules, each of the quantum dot surface light source modules includes a light source, a light guide plate group, a reflective block, and a quantum dot phosphor module, wherein the light guide plate group is provided with a through hole, and the reflective block is embedded In the through hole, the light source is disposed opposite to the reflective block, and the quantum dot phosphor module is disposed between the light source and the reflective block.
  • the light guide plate set includes a light guide plate and a reflective sheet attached to a surface of the light guide plate, the reflective sheet faces the quantum dot phosphor module, the through hole penetrates the light guide plate and the a reflective sheet, the reflective block being disposed in the light guide plate.
  • the reflective block comprises a plane facing a quantum dot phosphor module, and the curved surface is flush with a surface of the light guide plate facing away from the reflective sheet.
  • one end of the quantum dot phosphor module is embedded in the through hole, and the other end of the quantum dot phosphor module is attached to the light source.
  • the light source comprises an LED lamp holder and a plurality of light-emitting chips, and a side of the LED lamp holder facing the quantum dot phosphor module is provided with a groove, and the plurality of light-emitting chips are spaced apart from the groove. bottom.
  • the quantum dot phosphor module covers the groove.
  • the technical solution of the present invention provides a plurality of quantum dot surface light source modules, and the monochromatic light emitted by the light source of each quantum dot surface light source module directly excites the quantum dot phosphor layer to form white light, and the light is incident on the light guide plate group. After the reflection block in the hole, a part is directly refracted, and the other part is reflected into the light guide plate group, and is converted into a uniform surface light source by diffusion and refraction of the light guide plate group.
  • the quantum dot backlight module of the present invention has a reduced thickness and a high picture quality, and a structure in which the distance between the blue LED light source and the diffusion plate is widened to uniformly distribute the light to generate a surface light source. Reduced costs.
  • 1 is a schematic cross-sectional view of a conventional quantum dot backlight module
  • FIG. 2 is a schematic cross-sectional structural view of an embodiment of a quantum dot backlight module of the present invention
  • FIG. 3 is a cross-sectional structural view of a quantum dot surface light source module of the quantum dot backlight module of FIG. 2;
  • FIG. 4 is a schematic diagram of the optical path of the quantum dot surface light source module of FIG.
  • Label Name Label Name 10 PCB board 222 A reflective sheet 12 Blue LED light source 223 Through hole 14 Diffuser 230 Reflection block 16 Quantum dot fluorescent film 231 Plane 200 Quantum point surface light source module 232 Surface 210 Light source 240 Quantum dot phosphor module 211 LED lamp holder 241 Package board 212 Light emitting chip 242 Quantum dot phosphor layer 213 Groove 300 PCB board 220 Light guide plate set 400 Diffuser 221 Light guide
  • the terms "connected”, “fixed” and the like should be understood broadly, unless otherwise clearly defined and limited.
  • “fixed” may be a fixed connection, or may be a detachable connection, or may be integrated; It may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship of two elements unless explicitly defined otherwise.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • first, second, and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.
  • the invention provides a quantum dot backlight module.
  • FIG. 2 is a cross-sectional structural view of an embodiment of a quantum dot backlight module of the present invention
  • FIG. 3 is a cross-sectional structural view of a quantum dot surface light source module of the quantum dot backlight module of FIG. 2
  • FIG. 4 is a quantum dot surface light source of FIG. The optical path schematic of the module.
  • a quantum dot backlight module includes a plurality of quantum dot surface light source modules 200.
  • Each quantum dot surface light source module 200 includes a light source 210, a light guide plate group 220, and a reflective block.
  • 230 and the quantum dot phosphor module 240, the light guide plate group 220 is provided with a through hole 223, the reflection block 230 is embedded in the through hole 223, the light source 210 is opposite to the reflection block 230, and the quantum dot phosphor module 240 is disposed on the light source 210 and the reflection Between blocks 230.
  • the quantum dot backlight module of the present embodiment further includes a PCB board 300 and a diffusion board 400.
  • the plurality of quantum dot surface light source modules 200 are disposed between the PCB board 300 and the diffusion board 400, and the light source 210 is attached to the PCB board 300.
  • the PCB board 300 provides an electrical connection to the light source 210, which diffuses the light emitted by the plurality of quantum dot surface light source modules 200 again.
  • the plurality of quantum dot surface light source modules 200 are arrayed in an array between the PCB board 300 and the diffusion plate 400, and the number of the quantum dot surface light source modules 200 that are spliced can be 144 or more, thereby implementing Local. Dimming technology to achieve high color gamut dynamic effects.
  • the shape of the through hole 223 of the light guide plate group 220 in this embodiment may be a circular hole or a square hole or other shape. Of course, the shape of the reflection block 230 embedded in the through hole 223 should match.
  • the technical solution of the present invention is spliced between the PCB board 300 and the diffusion board 400 through a plurality of quantum dot surface light source modules 200, thereby realizing conversion from a point source to a quantum point surface light source to achieve local light control.
  • the quantum dot surface light source module 200 is provided with a light source 210, a light guide plate set 220, a reflective block 230 disposed opposite the light source 210, and a quantum dot phosphor module 240 located between the light source 210 and the reflective block 230. Referring to FIG. 4, the light source 210 The emitted monochromatic light directly excites the quantum dot phosphor module 240 to form a white light.
  • the quantum dot backlight module of the present invention reduces the distance between the PCB board 300 and the diffusion plate 400 by expanding the distance between the blue LED light source 12 and the diffusion plate 14 to generate a surface light source ( OD), the OD can be reduced from the conventional 15 mm or more to 6 mm or less, so that the thickness of the quantum dot backlight module of the present invention is greatly reduced.
  • the light source 210 directly excites the quantum dot phosphor module 240, and the light diffusion is small.
  • the required quantum dot phosphor module 240 has a small area, which reduces the cost.
  • the light source 210 excites the quantum dot phosphor module 240 to have substantially the same angle, which can be improved. The efficiency is stimulated and the displayed color is uniform and the picture quality is high.
  • the light guide plate set 220 includes a light guide plate 221 and a reflective sheet 222 attached to a surface of the light guide plate 221 .
  • the reflective sheet 222 faces the quantum dot phosphor module 240 , and the through hole 223 extends through the light guide plate 221 and reflects The sheet 222 and the reflection block 230 are disposed in the light guide plate 221 .
  • the main material of the light guide plate 221 is acrylic PMMA (polymethyl methacrylate), which has high light transmittance and strong impact resistance.
  • a reflective sheet 222 is disposed on the surface of the light guide plate 221 facing the quantum dot phosphor module 240. The reflective sheet 222 can reflect more light in the light guide plate 221 to the light exit surface of the light guide plate 221, thereby improving light utilization. .
  • the reflective block 230 includes a plane 231 and a curved surface 232.
  • the curved surface 232 faces the quantum dot phosphor module 240, and the plane 231 and the light guide plate 221 are flush with the surface of the reflective sheet 222.
  • the material of the reflective block 230 may be acrylic or other material.
  • the shape of the reflection block 230 should match the shape of the through hole 223.
  • the reflection block 230 may be a hemisphere; when the shape of the through hole 223 is a square, the shape of the plane 231 of the reflection block 230 is Square.
  • the curved surface 232 of the reflective block 230 faces the quantum dot phosphor module 240, that is, the curved surface 232 is the light incident surface of the reflective block 230, and the light source 210 excites the white light emitted by the quantum dot phosphor module 240 to the curved surface 232.
  • the curved surface 232 can reflect more light to the light guide plate 221 in a surface reflection manner, and the reflected light is more uniformly directed to the light guide plate 221, and the light enters the light guide plate 221 and is evenly distributed in the light guide plate 221, so that the light guide plate is uniformly distributed.
  • the light emitted in 221 is more uniform.
  • the quantum dot phosphor module 240 includes two oppositely disposed package plates 241 and a quantum dot phosphor layer 242 filled between the package plates 241.
  • the quantum dot phosphor layer 242 is generally formed by mixing quantum dot phosphor particles with a colloid, and the colloid can make the quantum dot phosphors more uniformly mixed and less prone to agglomeration.
  • the quantum dot phosphor particles in the quantum dot phosphor layer 242 have many advantages over the ordinary phosphors.
  • the quantum dot phosphor particles have a quantum size effect because the particle size is much smaller than that of ordinary phosphor particles;
  • the quantum dot phosphor particles have high luminescent color purity, and are more suitable for high color gamut liquid crystal display devices because their luminescence spectra are less than 50 nanometers, while ordinary fluorophores have luminescence spectra greater than 50 nanometers.
  • the material of the package board 241 is usually glass, and may be other materials other than glass which have good airtightness, high light transmittance, and good thermal stability.
  • the periphery of the package board 241 may be sealed by a sealant to completely close the quantum dot phosphor layer 242.
  • the quantum dot phosphor layer 242 is encapsulated between two package boards 241.
  • the two package boards 241 can effectively protect the quantum dot phosphor layer 242, thereby improving the stability of the quantum dot phosphor layer 242. Reliability, prolonging the service life of the quantum dot phosphor layer 242, the luminous efficiency is stable, and the uniformity of light color is good.
  • One end of the quantum dot phosphor module 240 is embedded in the through hole 221, and the other end of the quantum dot phosphor module 240 facing away from the through hole 221 is attached to the light source 210.
  • one end of the quantum dot phosphor module 240 is embedded in the through hole 223, and the shape of the quantum dot phosphor module 240 needs to match the shape of the through hole 223, so that the quantum dot phosphor layer 242 is emitted.
  • the white light is more received by the reflective block 230, further improving the light absorption rate and utilization.
  • the other end of the quantum dot phosphor module 240 facing away from the through hole 223 is attached to the light source 210, so that the light emitted by the light source 210 directly excites the quantum dot phosphor layer 242, and the intensity of the excited light wave band is uniform, and the obtained liquid crystal television picture is more Uniform, not easy to produce chromatic aberration.
  • the light source 210 includes an LED socket 211 and a plurality of light-emitting chips 212.
  • a side of the LED socket 211 facing the quantum dot phosphor module 240 is provided with a recess 213.
  • the plurality of light-emitting chips 212 are spaced apart from the bottom of the recess 213.
  • the light-emitting chip 212 can be monochromatic light.
  • the technical solution of the present invention uses a blue-light chip. Because of its high spectrum of the blue light source, different wavelengths can be generated, which can meet the backlight requirements of high color gamut.
  • the composition of the quantum dot phosphor layer 242 includes at least CdSe, Mn/CaS or ZnS which emit red and green light.
  • the light-emitting chip 212 can also be a light source of other colors, and the quantum dot phosphor layer 242 needs to be matched so as to be mixed into uniform white light after excitation.
  • the LED lamp holder 211 can be an aluminum alloy or a copper material, and the LED lamp holder 211 can provide certain protection for the light-emitting chip 212, and can also provide support for the quantum dot phosphor module 240.
  • the light-emitting chips 212 are arranged in an array such that the original light source is uniformly emitted.
  • the quantum dot phosphor module 240 covers the recess 213.
  • the quantum dot phosphor module 240 completely covers the recess 213, and the area of the quantum dot phosphor layer 242 is matched with the area of the light source 210, so that the light emitted by the light source 210 can be totally transmitted to the vector sub-point phosphor module 240, which is the largest. The degree of light utilization is improved. At the same time, the quantum dot phosphor layer 242 in the quantum dot phosphor module 240 can be excited to the greatest extent, thereby avoiding waste of the quantum dot phosphor layer 242 and saving cost.
  • the surface of the light guide plate 221 and the reflective sheet 222 is further provided with a plurality of dots (not shown).
  • the surface of the light guide plate 221 may be provided with a plurality of dots by printing, laser or injection molding.
  • the shape of the dots is semicircular, circular, elliptical, and hexagonal.
  • the area of the dots adjacent to the through holes 223 is larger than the distance from the through holes 223.
  • the area of the dot, the setting of the dot can enhance the diffusion of light.
  • a plurality of dots are disposed on a surface of the light guide plate 221 and the reflective sheet 222. When the light reaches the plurality of dots of the light guide plate 221, the light is sufficiently scattered to exhibit better reflection and refraction effects. Moreover, the light loss is less, so that the light guide plate 221 has higher light-emitting brightness and better light-emitting uniformity.
  • Another object of the present invention is to provide a liquid crystal television (not shown) including a quantum dot backlight module and a liquid crystal display panel (not shown).
  • the quantum dot backlight module is located on the light incident surface of the liquid crystal display panel, and the quantum dot The backlight module is the above quantum dot backlight module. Since the quantum dot backlight module of the liquid crystal television adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are not repeated herein.

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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)
  • Microelectronics & Electronic Packaging (AREA)
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Abstract

一种量子点背光模组及液晶电视，量子点背光模组包括多个量子点面光源模块（200）。每一量子点面光源模块（200）包括光源（210）、导光板组（220）、反射块（230）及量子点荧光粉模块（240）。导光板组（220）设有通孔（223），反射块（230）嵌设于通孔（223），光源（210）与反射块（230）相对设置，量子点荧光粉模块（240）设于光源（210）与反射块（230）之间。该量子点背光模组可大大减小量子点背光模组的厚度，并提高画面质量，节约成本。

Description

量子点背光模组及液晶电视
技术领域
本发明涉及液晶显示技术领域，特别涉及一种量子点背光模组及应用该量子点背光模组的液晶电视。
背景技术
量子点技术应用于液晶显示设备，可大幅度提升显示设备的色域和色彩鲜艳度，并降低能耗，应用量子点技术的液晶电视再搭配区域调光（Local Dimming）技术可获得高动态对比度（HDR），达到画质逼真的液晶显示效果。参考图1，传统的直下式量子点背光模组，是在PCB板10上设置蓝光LED光源12，蓝光LED光源12的光线经过扩散板14扩大发射面积，再激发量子点荧光膜16产生高色域白光。由于蓝光LED光源12与量子点荧光膜16存在较大的距离，造成激发效率下降；并且蓝光LED光源12的光线方向性为离散型，不同方向的光激发上方量子点荧光膜16会造成色彩不均匀现象；而且随着光源的扩散，量子点荧光膜16的面积需要增加，使得量子点背光模组的成本较高，同时由于PCB板10与扩散板14的间距大，也使得液晶电视的厚度较大。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本发明提出一种量子点背光模组，旨在减小量子点背光模组的厚度，并提高画面质量，节约成本。
为实现上述目的，本发明提出一种量子点背光模组，包括多个量子点面光源模块，每一所述量子点面光源模块包括光源、导光板组、反射块及量子点荧光粉模块，所述导光板组设有通孔，所述反射块嵌设于所述通孔，所述光源与所述反射块相对设置，所述量子点荧光粉模块设于所述光源与所述反射块之间。
优选地，所述导光板组包括导光板及贴合于所述导光板一表面的反射片，所述反射片面向所述量子点荧光粉模块，所述通孔贯穿所述导光板及所述反射片，所述反射块设于所述导光板内。
优选地，所述反射块包括一平面及一曲面，所述曲面面向所述量子点荧光粉模块，所述平面与所述导光板背离所述反射片的表面平齐。
优选地，所述量子点荧光粉模块包括两相对设置的封装板，及填充于所述封装板之间的量子点荧光粉层。
优选地，所述量子点荧光粉模块一端嵌设于所述通孔，所述量子点荧光粉模块另一端贴合于所述光源。
优选地，所述光源包括LED灯座及多个发光芯片，所述LED灯座面向所述量子点荧光粉模块的一侧设有凹槽，所述多个发光芯片间隔设于所述凹槽底部。
优选地，所述量子点荧光粉模块覆盖所述凹槽。
优选地，所述导光板与所述反射片贴合的表面设有网点。
优选地，该量子点背光模组还包括PCB板及扩散板，所述多个量子点面光源模块设于所述PCB板与所述扩散板之间，所述光源贴合于所述PCB板。
本发明的另一目的在于提出一种液晶电视，包括量子点背光模组以及液晶显示面板，所述量子点背光模组位于所述液晶显示面板的入光面，所述的量子点背光模组包括多个量子点面光源模块，每一所述量子点面光源模块包括光源、导光板组、反射块及量子点荧光粉模块，所述导光板组设有通孔，所述反射块嵌设于所述通孔，所述光源与所述反射块相对设置，所述量子点荧光粉模块设于所述光源与所述反射块之间。
优选地，所述导光板组包括导光板及贴合于所述导光板一表面的反射片，所述反射片面向所述量子点荧光粉模块，所述通孔贯穿所述导光板及所述反射片，所述反射块设于所述导光板内。
优选地，所述反射块包括一平面及一曲面，所述曲面面向所述量子点荧光粉模块，所述平面与所述导光板背离所述反射片的表面平齐。
优选地，所述量子点荧光粉模块一端嵌设于所述通孔，所述量子点荧光粉模块另一端贴合于所述光源。
优选地，所述光源包括LED灯座及多个发光芯片，所述LED灯座面向所述量子点荧光粉模块的一侧设有凹槽，所述多个发光芯片间隔设于所述凹槽底部。
优选地，所述量子点荧光粉模块覆盖所述凹槽。
本发明技术方案通过设置多个量子点面光源模块，每一量子点面光源模块的光源所发出的单色光直接激发量子点荧光粉层混合形成白光，光线射入嵌于导光板组的通孔内的反射块后，一部分直接折射出去，另一部分反射到导光板组中，通过导光板组的扩散与折射转化为均匀的面光源射出。相对于现有的量子点背光模组采用拉开蓝光LED光源与扩散板间距以使光线均匀分布而产生面光源的结构，本发明的量子点背光模组的厚度减小，画面质量高，并且降低了成本。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为现有的量子点背光模组的截面结构示意图；
图2为本发明量子点背光模组一实施例的截面结构示意图；
图3为图2中量子点背光模组的的量子点面光源模块的截面结构示意图；
图4为图3中量子点面光源模块的光路原理图。
附图标号说明：
标号 名称 标号 名称
10 PCB板 222 反射片
12 蓝光LED光源 223 通孔
14 扩散板 230 反射块
16 量子点荧光膜 231 平面
200 量子点面光源模块 232 曲面
210 光源 240 量子点荧光粉模块
211 LED灯座 241 封装板
212 发光芯片 242 量子点荧光粉层
213 凹槽 300 PCB板
220 导光板组 400 扩散板
221 导光板
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明，本发明实施例中所有方向性指示（诸如上、下、左、右、前、后……）仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
在本发明中，除非另有明确的规定和限定，术语“连接”、“固定”等应做广义理解，例如，“固定”可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
另外，在本发明中如涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
本发明提出一种量子点背光模组。
图2为本发明量子点背光模组一实施例的截面结构示意图；图3为图2中量子点背光模组的量子点面光源模块的截面结构示意图；图4为图3中量子点面光源模块的光路原理图。
请结合参照图2和图3，本发明一实施例的量子点背光模组，包括多个量子点面光源模块200，每一量子点面光源模块200包括光源210、导光板组220、反射块230及量子点荧光粉模块240，导光板组220设有通孔223，反射块230嵌设于通孔223，光源210与反射块230相对设置，量子点荧光粉模块240设于光源210与反射块230之间。
本实施例量子点背光模组还包括PCB板300及扩散板400，多个量子点面光源模块200设于PCB板300与扩散板400之间，光源210贴合于PCB板300。PCB板300对光源210提供电路连接，扩散板400将多个量子点面光源模块200发出的光再次均匀化。多个量子点面光源模块200于PCB板300与扩散板400之间阵列拼接，进行拼接的量子点面光源模块200的数量可为144以上，以此来实现Local Dimming技术，达到高色域动态效果。本实施例贯穿导光板组220的通孔223的形状可以为圆孔，也可以是方孔或者其他形状，当然嵌于通孔223的反射块230的形状应与之相匹配。
本发明技术方案通过多个量子点面光源模块200拼接设于PCB板300与扩散板400之间，实现由点光源转换为量子点面光源，达到局部控光作用。量子点面光源模块200设有光源210、导光板组220、与光源210相对设置的反射块230及位于光源210与反射块230之间的量子点荧光粉模块240，请参照图4，光源210发出的单色光直接激发量子点荧光粉模块240混合形成白光，光线射入嵌于导光板组220的通孔223内的反射块230后，一部分直接折射出去，另一部分反射到导光板组220中，光线通过导光板组220的折射与反射均匀射出从而形成面光源。相对于传统量子点背光模组通过拉大蓝光LED光源12与扩散板14的间距而产生面光源的方案，本发明的量子点背光模组缩小了PCB板300到扩散板400之间的距离（OD），OD可以由传统的15毫米以上缩小到6毫米以内，使得本发明的量子点背光模组厚度大为减小。并且光源210直接激发量子点荧光粉模块240，光线扩散少，所需要的量子点荧光粉模块240的面积小，降低了成本；同时光源210激发量子点荧光粉模块240的角度大致相同，可提高激发效率且显示的色彩均匀，画面质量高。
请参照图3、图4，导光板组220包括导光板221及贴合于导光板221一表面的反射片222，反射片222面向量子点荧光粉模块240，通孔223贯穿导光板221及反射片222，反射块230设于导光板221内。
导光板221的主要材质为亚克力PMMA（聚甲基丙烯酸甲酯），其具有很高的透光率，抗冲击能力强。本实施例中，在导光板221面向量子点荧光粉模块240的表面设置反射片222，反射片222可将导光板221内更多的光线反射至导光板221的出光面，提高光的利用率。
本实施例中反射块230包括一平面231及一曲面232，曲面232面向量子点荧光粉模块240，平面231与导光板221背离反射片222的表面平齐。
反射块230的材料可以是亚克力或者其他材料。反射块230的形状应与通孔223的形状相匹配，当通孔223为圆孔时，反射块230可以是半球体；当通孔223的形状为方形时，反射块230的平面231形状为方形。
在本实施例中，反射块230的曲面232面向量子点荧光粉模块240，即该曲面232为反射块230的入光面，光源210激发量子点荧光粉模块240射出的白光射向曲面232，曲面232可以使更多的光线以表面反射的方式反射至导光板221，并且反射的光线更加均匀地射向到导光板221，光线进入导光板221后于导光板221内分布均匀，使得导光板221内射出的光线更均匀。
请再次参照图3，量子点荧光粉模块240包括两相对设置的封装板241及填充于封装板241之间的量子点荧光粉层242。
量子点荧光粉层242一般由量子点荧光粉颗粒与胶体混合而成，胶体可以使量子点荧光粉混合得更加均匀，并且不容易发生团聚。量子点荧光粉层242内的量子点荧光粉颗粒相比于普通荧光粉有很多优点：首先，量子点荧光粉颗粒具有量子尺寸效应，因其颗粒尺寸远小于普通荧光粉颗粒的尺寸；再者，量子点荧光粉颗粒发光色纯度高，更适用于高色域液晶显示装置，因为其发光光谱小于50纳米，而普通荧光粉的发光光谱则大于50纳米。
封装板241的材质通常为玻璃，还可以是除玻璃之外的具备气密性好、透光率高、热稳定性好的其他材料。封装过程中可对封装板241四周通过密封胶进行封边，以对量子点荧光粉层242进行完全封闭。本实施例将量子点荧光粉层242封装于两个封装板241之间，两个封装板241可以对量子点荧光粉层242进行有效的保护，提高了量子点荧光粉层242的稳定性和可靠性，延长量子点荧光粉层242的使用寿命，发光效率稳定，同时光色均匀性好。
量子点荧光粉模块240一端嵌于通孔221，量子点荧光粉模块240背离通孔221的另一端贴合于光源210。
本实施例中将量子点荧光粉模块240的一端嵌设于通孔223，量子点荧光粉模块240的形状需与通孔223的形状相匹配，这样可以使激发量子点荧光粉层242后发出的白光较多的由反射块230接收，进一步提高光的吸收率和利用率。同时量子点荧光粉模块240背离通孔223的另一端与光源210贴合，可以使光源210发出的光直接激发量子点荧光粉层242，激发出的光波波段强度一致，得到的液晶电视画面更加均匀，不易产生色差。
光源210包括LED灯座211及多个发光芯片212，LED灯座211面向量子点荧光粉模块240的一侧设有凹槽213，多个发光芯片212间隔设于凹槽213底部。
发光芯片212可以是单色光，本发明技术方案使用蓝光芯片，因其蓝光光源频谱较高，可以产生不同的波长，能满足高色域的背光要求。对应地，量子点荧光粉层242组成成分至少包括发红绿光的CdSe，Mn/CaS或ZnS。当然发光芯片212还可以是其他颜色的光源，量子点荧光粉层242需与之相配合，以使激发后可以混合成均匀的白光。
本实施例中LED灯座211可以是铝合金或者铜材料，LED灯座211可为发光芯片212提供一定的保护，也可以为量子点荧光粉模块240提供支撑。发光芯片212阵列式排列，这样可以使最初的光源均匀射出。
请再次参照图3，量子点荧光粉模块240覆盖所述凹槽213。
本实施例中量子点荧光粉模块240完全覆盖凹槽213，量子点荧光粉层242的面积与光源210的面积相匹配，可以使光源210发出的光全部射向量子点荧光粉模块240，最大程度提高光的利用率；同时，量子点荧光粉模块240内的量子点荧光粉层242可以被最大程度地激发，避免了量子点荧光粉层242的浪费，节约了成本。
本实施例中导光板221与反射片222贴合的表面还设有多个网点（未标示）。
导光板221的表面可以通过印刷、激光或者射出成型的方式设置多个网点，网点的形状有半圆形、圆形、椭圆形以及六角形等，靠近通孔223的网点面积大于远离通孔223的网点面积，网点的设置可提升光线的扩散效果。本实施例中，在导光板221与反射片222贴合的一面设有多个网点，当光线到达导光板221的多个网点时会被充分打散，表现出更好的反射与折射效果，且光线损失较少，从而使导光板221具有较高的出光亮度及更好的出光均匀度。
本发明的另一目的在于提出一种液晶电视（未图示），包括量子点背光模组以及液晶显示面板（未图示），量子点背光模组位于液晶显示面板的入光面，量子点背光模组为上述的量子点背光模组。由于液晶电视的量子点背光模组采用了上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (15)

  1. 一种量子点背光模组，其中，包括多个量子点面光源模块，每一所述量子点面光源模块包括光源、导光板组、反射块及量子点荧光粉模块，所述导光板组设有通孔，所述反射块嵌设于所述通孔，所述光源与所述反射块相对设置，所述量子点荧光粉模块设于所述光源与所述反射块之间。
  2. 如权利要求1所述的量子点背光模组，其中，所述导光板组包括导光板及贴合于所述导光板一表面的反射片，所述反射片面向所述量子点荧光粉模块，所述通孔贯穿所述导光板及所述反射片，所述反射块设于所述导光板内。
  3. 如权利要求2所述的量子点背光模组，其中，所述反射块包括一平面及一曲面，所述曲面面向所述量子点荧光粉模块，所述平面与所述导光板背离所述反射片的表面平齐。
  4. 如权利要求1所述的量子点背光模组，其中，所述量子点荧光粉模块包括两相对设置的封装板，及填充于所述封装板之间的量子点荧光粉层。
  5. 如权利要求4所述的量子点背光模组，其中，所述量子点荧光粉模块一端嵌设于所述通孔，所述量子点荧光粉模块另一端贴合于所述光源。
  6. 如权利要求1所述的量子点背光模组，其中，所述光源包括LED灯座及多个发光芯片，所述LED灯座面向所述量子点荧光粉模块的一侧设有凹槽，所述多个发光芯片间隔设于所述凹槽底部。
  7. 如权利要求6所述的量子点背光模组，其中，所述量子点荧光粉模块覆盖所述凹槽。
  8. 如权利要求3所述的量子点背光模组，其中，所述导光板与所述反射片贴合的表面设有网点。
  9. 如权利要求1所述的量子点背光模组，其中，该量子点背光模组还包括PCB板及扩散板，所述多个量子点面光源模块设于所述PCB板与所述扩散板之间，所述光源贴合于所述PCB板。
  10. 一种液晶电视，包括量子点背光模组以及液晶显示面板，所述量子点背光模组位于所述液晶显示面板的入光面，其中，所述量子点背光模组包括多个量子点面光源模块，每一所述量子点面光源模块包括光源、导光板组、反射块及量子点荧光粉模块，所述导光板组设有通孔，所述反射块嵌设于所述通孔，所述光源与所述反射块相对设置，所述量子点荧光粉模块设于所述光源与所述反射块之间。
  11. 如权利要求10所述的液晶电视，其中，所述导光板组包括导光板及贴合于所述导光板一表面的反射片，所述反射片面向所述量子点荧光粉模块，所述通孔贯穿所述导光板及所述反射片，所述反射块设于所述导光板内。
  12. 如权利要求11所述的液晶电视，其中，所述反射块包括一平面及一曲面，所述曲面面向所述量子点荧光粉模块，所述平面与所述导光板背离所述反射片的表面平齐。
  13. 如权利要求10所述的液晶电视，其中，所述量子点荧光粉模块一端嵌设于所述通孔，所述量子点荧光粉模块另一端贴合于所述光源。
  14. 如权利要求10所述的液晶电视，其中，所述光源包括LED灯座及多个发光芯片，所述LED灯座面向所述量子点荧光粉模块的一侧设有凹槽，所述多个发光芯片间隔设于所述凹槽底部。
  15. 如权利要求14所述的液晶电视，其中，所述量子点荧光粉模块覆盖所述凹槽。
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