WO2022222181A1 - 背光模组及量子点显示装置 - Google Patents

背光模组及量子点显示装置 Download PDF

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Publication number
WO2022222181A1
WO2022222181A1 PCT/CN2021/091484 CN2021091484W WO2022222181A1 WO 2022222181 A1 WO2022222181 A1 WO 2022222181A1 CN 2021091484 W CN2021091484 W CN 2021091484W WO 2022222181 A1 WO2022222181 A1 WO 2022222181A1
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Prior art keywords
light
quantum dot
backlight module
color conversion
emitting element
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PCT/CN2021/091484
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English (en)
French (fr)
Inventor
白雪
兰松
周淼
李冬泽
Original Assignee
深圳市华星光电半导体显示技术有限公司
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Priority to US17/295,466 priority Critical patent/US12019329B2/en
Publication of WO2022222181A1 publication Critical patent/WO2022222181A1/zh

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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
    • G02F1/133603—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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements

Definitions

  • the present invention relates to the technical field of backlight display, in particular to a backlight module and a quantum dot display device.
  • Quantum dot liquid crystal display panel has the advantages of large viewing angle and high color gamut.
  • the viewing angle of mass-produced ordinary LCD TVs sold in the existing market is about 60°, and the viewing angle of quantum dot TVs is about 80°.
  • the quantum dot film layer is introduced on the polarizing layer on one side of the thin film transistor array substrate, and is attached to the outer side of the polarizing layer (QD-POL) to increase the viewing angle to more than 120°, but due to the low excitation efficiency, it is difficult to Meet the ideal high color gamut, wide viewing angle, high energy efficiency requirements.
  • the backlight module and the quantum dot display device provided by the present invention have high color gamut, wide viewing angle and high energy efficiency.
  • the present invention provides a backlight module, comprising:
  • the color conversion layer includes phosphor powder, and the phosphor powder emits at least one of red light, green light and yellow light under the excitation of blue light.
  • the weight percentage of the phosphor powder in the color conversion layer is 0.05wt%-0.5wt%.
  • the phosphor material is rare earth phosphor or antimony, manganese activated calcium halophosphate phosphor.
  • the color conversion layer is an encapsulation layer covering the light-emitting element.
  • the backlight module includes:
  • a reflective sheet located on the upper surface of the substrate and adjacent to the light-emitting element
  • the color conversion layer is located on a side surface of the reflective sheet away from the substrate.
  • the backlight module further includes:
  • a diffuser plate located on one side of the light-emitting surface of the light-emitting element
  • the color conversion layer is formed on the surface of the diffusion plate.
  • a plurality of protrusions are formed on a surface of the color conversion layer away from the diffusion plate.
  • the diffuser plate is a transparent diffuser plate with a transmittance greater than 90%.
  • a second aspect of the present invention provides a quantum dot display device, the quantum dot display device comprising:
  • the backlight module as described above;
  • the display panel is located on one side of the light-emitting surface of the backlight module, and the display panel includes a quantum dot film layer.
  • the display panel further includes a polarizer, and the quantum dot film layer is formed on the polarizer.
  • the present invention adds a small amount of fluorescent powder in the backlight module that can convert part of the blue backlight into red light, green light or yellow light under the excitation of the blue backlight.
  • the brightness of red, green or yellow light perceived by the human eye is greater than the brightness of blue light, so the energy efficiency of the light-emitting element can be improved;
  • the energy efficiency can be improved by 10%-30%.
  • FIG. 1 is a schematic diagram of a quantum dot display device provided by the present invention.
  • FIG. 2 is a schematic diagram of a backlight module provided by the first embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a backlight module provided by a second embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a backlight module provided by a third embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a backlight module provided by a fourth embodiment of the present invention.
  • the present invention may repeat reference numerals and/or reference letters in different implementations, such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementations and/or arrangements discussed.
  • the present invention adds a small amount of at least one of red, green and yellow phosphors in the backlight module or sets the diffusion plate as a transparent diffusion plate, thereby improving the quantum dots. Displays the energy efficiency of the device.
  • a first embodiment of the present invention provides a quantum dot display device 100 .
  • the quantum dot display device 100 includes a backlight module 110 and a display panel 120 .
  • the backlight module 110 faces the display panel 120 .
  • the backlight module 110 includes at least one light-emitting element 11 , at least one color conversion layer 12 , a reflective sheet 13 and a bottom plate 14 .
  • the light-emitting element 11 is a blue light-emitting element.
  • the light emitting element 11 is a blue backlight light emitting diode.
  • the color conversion layer 12 is an encapsulation layer covering the light-emitting element 11 .
  • the color conversion layer 12 includes a small amount of phosphors 121 , and the phosphors 121 emit at least one of red light, green light and yellow light when excited by blue light. That is to say, the phosphor 121 may be at least one of red phosphor, green phosphor and yellow phosphor.
  • the material of the phosphor 121 may be at least one of rare earth phosphors such as yttrium aluminum garnet (YAG), antimony and manganese activated calcium halophosphate phosphors, and the like.
  • the weight percentage of the phosphor 121 in the color conversion layer 12 is 0.05wt%-0.5wt%.
  • the brightness of red light, green light or yellow light perceived by human eyes is greater than that of blue light, so a small amount of red phosphor, green phosphor or yellow phosphor is added to the backlight module. , which can increase the light extraction rate and improve the energy efficiency of the light-emitting element.
  • the energy efficiency can be improved by 10% to 30%.
  • the color conversion layer 12 further includes a sealant layer 122 , the sealant layer 122 at least partially covers the light-emitting element 11 , and the phosphors 121 are uniformly dispersed in the sealant layer 122 .
  • the material of the sealing layer 122 may be pressure sensitive. sensitive adhesive, PSA) adhesive, ultraviolet (ultraviolet ray, UV) curing adhesive, etc.
  • the reflective sheet 13 is adjacent to the light-emitting element 11, and the reflective sheet 13 is used to reflect the blue light irradiated on the reflective sheet 13, so as to reduce the loss of blue light.
  • the bottom plate 14 is used for driving the light-emitting element 11 to emit blue light, and the light-emitting element 11 and the reflection sheet 13 are both formed on the bottom plate 14 .
  • the bottom plate 14 is a circuit board, and the light-emitting element 11 is electrically connected to the bottom plate 14 .
  • the base plate 14 may also be a base plate including a circuit board or a substrate.
  • the backlight module 110 may further include a diffuser plate 15 , and the diffuser plate 15 is located on one side of the light-emitting surface of the light-emitting element 11 .
  • the quantum dot polarizer 20 faces the diffusion plate 15 .
  • the backlight module 110 may not include the diffusion plate 15 .
  • the quantum dot polarizer 20 includes a film layer with light diffusing particles.
  • the display panel 120 includes a display panel body 30 and a quantum dot polarizer 20 , and the quantum dot polarizer 20 is disposed on the surface of the display panel body 30 facing the backlight module 110 . superior.
  • the quantum dot polarizer 20 includes a core layer 21 , a polarizer 22 and a quantum dot film layer 23 , and the polarizer 22 and the quantum dot film layer 23 are located on opposite sides of the core layer 21 . . Specifically, the polarizer 22 is attached to a surface of the core layer 21 through a first adhesive layer 24 , and the quantum dot film layer 23 is attached to the core through a second adhesive layer 25 . on the other surface of layer 21 . The quantum dot film layer 23 faces the backlight module 110 .
  • the material of the core layer 21 includes triacetate cellulose.
  • the polarizer 22 is an iodine-based polarizing film or a dye-based polarizing film; the material of the polarizer 22 includes polyvinyl alcohol.
  • the quantum dot film layer 23 is a film material containing quantum dots, which can be a quantum dot film obtained by mixing quantum dots with other materials through a film forming process, or a quantum dot film prepared from quantum dots alone. .
  • the quantum dots in the quantum dot film layer 23 can be a mixture of one or more, preferably, the quantum dots in the quantum dot film layer 23 are a combination of multiple quantum dots, such as red emitting light Quantum dots and quantum dots that emit green light to achieve better color gamut enhancement and mixing effects.
  • the red light material of the quantum dots in the quantum dot film layer 23 includes one or more of CdSe, Cd2SeTe and InAs;
  • the green light material of the quantum dots in the quantum dot film layer 23 includes ZnCdSe2 One or more of , InP and Cd2SSe.
  • the quantum dots may be quantum dots modified by a surface grafting method or a surface coating method, so that they can achieve a more uniform and stable mixing effect in a solvent.
  • the quantum dots are oil-soluble or water-soluble.
  • the quantum dots are nanoparticles with a diameter of 0-20 nm.
  • the film forming process of the quantum dot film layer 23 is a process such as spray coating, spin coating, printing, or slit coating.
  • the quantum dot film layer 23 excites excitation light with a narrower half-width, thereby increasing the color gamut range of the display device and improving the picture quality.
  • quantum dots themselves have the ability to convert light.
  • the quantum dot polarizer 20 can be used as the lower polarizer of the liquid crystal display panel; since the quantum dots in the quantum dot film layer 23 have luminescent properties, they can increase the color gamut coverage.
  • the quantum dot polarizer 20 can not only ensure the polarization, but also can effectively improve the color gamut coverage of the display device 100, and at the same time, can realize a wide viewing angle of the display device 100, and the preparation process is simple.
  • the display panel main body 30 includes a first substrate (not shown), a second substrate (not shown), and a liquid crystal layer between the first substrate and the second substrate.
  • the first substrate is an array substrate
  • the second substrate is a color filter substrate
  • the polarizer 22 is formed on a surface of the first substrate close to the backlight module 110 .
  • a second quantum dot film layer (not shown) may also be formed on the first substrate of the display panel 120 , and the second quantum dot film layer is located between the first substrate and the polarizer 22 .
  • the structure and material of the second quantum dot film layer are the same as those of the first quantum dot film layer 23 .
  • the second quantum dot film layer can further improve the color gamut coverage of the display device 100 , and at the same time, can realize a wide viewing angle of the display device 100 .
  • the quantum dot film layer 23 and the polarizer 22 may not be combined together, and the quantum dot film layer 23 is directly formed on the display panel 120 facing the backlight module 110 . on one side surface.
  • the quantum dot display device 100 may further include an upper polarizer (not shown), and the upper polarizer is formed on a surface of the second substrate away from the first substrate.
  • a second embodiment of the present invention provides a quantum dot display device 200 and a backlight module 210 .
  • the quantum dot display device 200 is similar in structure to the quantum dot display device 100 , and the difference is that the backlight module 210 of the quantum dot display device 200 is different from the backlight module 110 of the quantum dot display device 100 . .
  • the backlight module 210 includes at least one light-emitting element 41 , at least one color conversion layer 42 , a reflection sheet 43 and a bottom plate 44 .
  • the reflection sheet 43 is located on one side of the light-emitting element 41 , and the light-emitting element 41 and the reflection sheet 43 are both formed on the bottom plate 44 .
  • the light-emitting element 41 is a blue light-emitting element.
  • the light emitting element 41 is a blue backlight light emitting diode.
  • the color conversion layer 42 is formed on the reflective sheet 43, and the color conversion layer 42 includes a small amount of phosphor 421, and the phosphor 421 emits red when excited by blue light light, green or yellow. That is to say, the phosphor 421 may be at least one of red phosphor, green phosphor and yellow phosphor. Specifically, the material of the phosphor 421 may be at least one of rare earth phosphors such as yttrium aluminum garnet (YAG) and antimony and manganese activated calcium halophosphate phosphors.
  • YAG yttrium aluminum garnet
  • the percentage by weight of the phosphor 421 in the color conversion layer 42 is 0.05wt%-0.5wt%.
  • the color conversion layer 42 is patterned.
  • the phosphor 421 in the color conversion layer 42 is excited by the light reflected by the reflection sheet 43 to emit red light, green light or yellow light, where the excitation is performed during the light reflection process.
  • the reflection sheet 43 is used for reflecting the blue light irradiated on the reflection sheet 43 to reduce the loss of the blue light.
  • the bottom plate 44 is used for driving the light-emitting element 41 to emit blue light.
  • the backlight module 210 may further include a diffuser plate 45 located above the light-emitting element 41 and in the light-emitting direction of the light-emitting element 41 .
  • the quantum dot polarizer 20 faces the diffusion plate 45 .
  • the backlight module 210 may not include the diffusion plate 45 .
  • the color conversion layer 42 may be formed on the light-emitting element 41 and the reflection sheet 43 at the same time.
  • a third embodiment of the present invention provides a quantum dot display device 300 and a backlight module 310 .
  • the quantum dot display device 300 is similar in structure to the quantum dot display device 100 , and the differences are The point is that the backlight module 310 of the quantum dot display device 200 is different from the backlight module 110 of the quantum dot display device 100 .
  • the backlight module 310 includes at least one light-emitting element 51 , at least one color conversion layer 52 , a reflection sheet 53 , a bottom plate 54 and a diffuser plate 55 .
  • the reflection sheet 53 is adjacent to the light-emitting element 51 , the light-emitting element 51 and the reflection sheet 53 are both formed on the bottom plate 54 , and the diffusion plate 55 is located on the light-emitting surface side of the light-emitting element 51 . .
  • the light-emitting element 51 is a blue light-emitting element. In an optional embodiment of the present invention, the light emitting element 51 is a blue backlight light emitting diode.
  • the color conversion layer 52 is formed on the diffusion plate 55, and the color conversion layer 52 includes a small amount of phosphor 521, and the phosphor 521 emits red when excited by blue light light, green or yellow. That is to say, the phosphor 521 may be at least one of red phosphor, green phosphor and yellow phosphor. Specifically, the material of the phosphor 521 may be at least one of rare earth phosphors such as yttrium aluminum garnet (YAG), and calcium halophosphate phosphors activated by antimony and manganese.
  • YAG yttrium aluminum garnet
  • calcium halophosphate phosphors activated by antimony and manganese.
  • the percentage by weight of the phosphor 521 in the color conversion layer 52 is 0.05wt%-0.5wt%.
  • the surface of the color conversion layer 52 facing the display panel 120 is patterned to form a pattern, which can increase the light extraction rate.
  • the phosphor 521 in the color conversion layer 52 is excited by the light reflected by the reflection sheet 53 to emit red light, green light or yellow light in the process of light reflection.
  • a plurality of protrusions 523 are formed on a surface of the color conversion layer 52 away from the light-emitting element 51 , and the protrusions 523 can increase the diffusion range of light.
  • the diffusion plate 55 After the light emitted by the light-emitting element 51 is diffused by the diffusion plate 55, most of the light passes through the diffusion plate 55 and enters the quantum dot polarizer 20, and a small part of the light passes through the diffusion plate 55 and irradiates to the quantum dot polarizer 20.
  • the phosphor powder 521 in the color conversion layer 52 the phosphor powder 521 emits red light, green light or yellow light.
  • the reflection sheet 53 is used for reflecting the blue light irradiated on the reflection sheet 53 to reduce the loss of the blue light.
  • a fourth embodiment of the present invention provides a quantum dot display device 400 and a backlight module 410 .
  • the quantum dot display device 400 is similar in structure to the quantum dot display device 100 , and the differences are The point is that the backlight module 410 in the quantum dot display device 400 is different from the backlight module 110 of the quantum dot display device 100 .
  • the backlight module 410 includes at least one light-emitting element 61 , a reflection sheet 63 , a bottom plate 64 and a diffuser plate 65 .
  • the reflection sheet 63 is located on one side of the light-emitting element 61 , the light-emitting element 61 and the reflection sheet 63 are both formed on the bottom plate 64 , the light-emitting element 61 is electrically connected to the bottom plate 64 , and the The diffusion plate 65 is located above the light-emitting element 61 and is located in the light-emitting direction of the light-emitting element 61 .
  • the light-emitting element 61 is a blue light-emitting element.
  • the light emitting element 61 is a blue backlight light emitting diode.
  • the reflection sheet 63 is used for reflecting the blue light irradiated on the reflection sheet 63 to reduce the loss of the blue light.
  • the diffuser plate 65 is a transparent diffuser plate.
  • the penetration rate of the diffuser plate is greater than 90%. Setting the diffuser plate 65 of the backlight module 410 as a transparent diffuser plate can increase the transmittance of the backlight, thereby reducing the loss of the backlight and improving the energy efficiency of the light-emitting element. In the present invention, the energy efficiency can be improved by 10% to 30%.
  • the backlight modules 110 , 210 , 310 and 410 may be applied to the two liquid crystal display modes of VA and IPS in one or a combination. That is to say, the color conversion layer can be formed on any two or three of the light-emitting element, the reflection sheet and the diffuser plate at the same time, and the diffuser plate can also be set as a transparent diffuser plate. At the same time, a color conversion layer is included, and the color conversion layer may be disposed on at least one of the light-emitting element, the reflection sheet and the diffusion plate.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Manufacturing & Machinery (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

本申请提供一种背光模组及量子点显示装置，本申请通过对量子点显示装置的背光进行更改来提升能效。具体地，通过在背光模组中添加少量的荧光粉或将扩散板设置成透明的扩散板来提升发光元件的能效。另外，本申请提供的量子点显示装置既具有所述背光装置又具有量子点膜层和偏光片。

Description

背光模组及量子点显示装置 技术领域
本发明涉及背光显示技术领域，尤其涉及一种背光模组及量子点显示装置。
 背景技术
目前由于量子点材料(Quantum Dot，QD)本身所具有的高色纯度、光谱连续可调等优异性质，使其成为21世纪最为优秀的发光材料，可以在显示色域上大幅度提高现有LCD的色彩表现，因此近年来其显示应用被广泛研究。现有的QD-OC(量子点液晶显示面板)具有视角极大，色域较高的优势。现有市场销售的量产普通液晶电视的视角约为60°，量子点电视的视角约为80°。现有技术，将量子点膜层引入薄膜晶体管阵列基板一侧的偏光层上，贴合于偏光层的外侧(QD-POL)提高视角到120°以上，但是由于激发效率低的原因，较难满足理想的高色域、广视角、高能效要求。
 技术问题
本发明提供的背光模组及量子点显示装置具有高色域、广视角及高能效。
 技术解决方案
为解决上述问题，本发明提供的技术方案如下：
本发明提供一种背光模组，包括：
发光元件，所述发光元件发蓝光；及
色转换层，所述色转换层中包括荧光粉，所述荧光粉在蓝光的激发下发出红光、绿光和黄光中的至少一种。
在本发明一可选实施例中，所述色转换层中，所述荧光粉占所述色转换层的重量百分比为0.05wt%-0.5wt%。
在本发明一可选实施例中，所述荧光粉材料为稀土荧光粉或锑、锰激活的卤磷酸钙荧光粉。
在本发明一可选实施例中，所述色转换层为覆盖所述发光元件的封装层。
在本发明一可选实施例中，所述背光模组包括：
基板，所述发光元件形成在所述基板上；
反射片，位于所述基板上表面且与所述发光元件相邻；
所述色转换层位于所述反射片的远离所述基板的一侧表面。
在本发明一可选实施例中，所述背光模组还包括：
扩散板，位于所述发光元件的出光面一侧；
所述色转换层形成在所述扩散板的表面。
在本发明一可选实施例中，所述色转换层的远离所述扩散板的表面上形成有多个凸起。
在本发明一可选实施例中，所述扩散板为穿透率大于90%的透明扩散板。
本发明第二方面提供一种量子点显示装置，所述量子点显示装置包括：
如上所述的背光模组；及
显示面板，位于所述背光模组的出光面的一侧，且所述显示面板包括量子点膜层。
在本发明一可选实施例中，所述显示面板还包括偏光片，所述量子点膜层形成在所述偏光片上。
 有益效果
本发明的有益效果为：一方面，本发明在背光模组内增加少量的能够在蓝色背光的激发下将部分蓝色背光转换为红光、绿光或黄光的荧光粉，由于在相同功率下，人眼感受到的红光、绿光或黄光的亮度大于蓝光的亮度，因此，可以提升发光元件的能效；另一方面，将背光模组的扩散板设置成透明扩散板，可以增大背光的透过率，减少背光的损耗，提升发光元件的能效。在本发明中，所述能效能够提升10%-30%。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例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，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本发明提供的一种量子点显示装置的示意图；
图2为本发明第一实施例提供的一种背光模组的示意图；
图3为本发明第二实施例提供的一种背光模组的示意图；
图4为本发明第三实施例提供的一种背光模组的示意图；及
图5为本发明第四实施例提供的一种背光模组的示意图。
 本发明的实施方式
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。
在本发明的描述中，需要理解的是，术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示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一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体地限定。
本发明可以在不同实施中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。
本发明针对现有的量子点显示装置能效低的技术问题，在背光模组中添加少量的红、绿、黄荧光粉中的至少一种或者将扩散板设置成透明扩散板，从而提升量子点显示装置的能效。
以下将结合具体实施例对本发明的背光模组及量子点电视装置进行详细描述。
请参阅图1-2，本发明第一实施例提供一种量子点显示装置100。所述量子点显示装置100包括一背光模组110及一显示面板120。所述背光模组110面向所述显示面板120。
具体地，请参阅图2，所述背光模组110包括至少一发光元件11、至少一色转换层12、一反射片13及一底板14。
其中，所述发光元件11为蓝光发光元件。在本发明一可选实施例中，所述发光元件11为蓝背光发光二极管。
在本实施例中，所述色转换层12为覆盖所述发光元件11的封装层。所述色转换层12中包括少量荧光粉121，所述荧光粉121在蓝光的激发下会发出红光、绿光及黄光中的至少一种。也即是说，所述荧光粉121可以为红色荧光粉、绿色荧光粉及黄色荧光粉中的至少一种。具体地，所述荧光粉121的材料可以是钇铝石榴石（YAG）等稀土荧光粉及锑、锰激活的卤磷酸钙荧光粉等中的至少一种。
在本发明一可选实施例中，所述荧光粉121占所述色转换层12的重量百分比为0.05wt%-0.5wt%。
由于在相同功率下，人眼感受到的红光、绿光或黄光的亮度要大于蓝光的亮度，因此，在所述背光模组中增加少量的红色荧光粉、绿色荧光粉或黄色荧光粉，可以增加出光率并提升发光元件的能效。在本发明中，所述能效可以提升10%~30%。
其中，所述色转换层12还包括封胶层122，所述封胶层122至少部分包覆所述发光元件11，所述荧光粉121均匀分散在所述封胶层122内。
所述封胶层122的材质可以为压敏（pressure sensitive adhesive，PSA）胶、紫外光（ultraviolet ray，UV）固化胶等。
其中，所述反射片13与所述发光元件11相邻，所述反射片13用于反射照射到所述反射片13上的蓝光，以减少蓝光的损耗。
其中，所述底板14用于驱动所述发光元件11发出蓝光，所述发光元件11及所述反射片13均形成在所述底板14上。在本发明一可选实施例中，所述底板14为电路板，所述发光元件11与所述底板14电连接。在本发明其他实施例中，所述底板14还可以是包含有电路板的底板或者是衬底。
在本发明一可选实施例中，所述背光模组110还可以包括一扩散板15，所述扩散板15位于所述发光元件11的出光面一侧。所述量子点偏光片20面向所述扩散板15。
在其他实施例中，所述背光模组110还可以不所述扩散板15。当然，这是在所述量子点偏光片20中包括具有光扩散粒子的膜层的前提下才可以实现的。
在本实施例中，所述显示面板120包括一显示面板主体30及一量子点偏光片20，所述量子点偏光片20设置在所述显示面板主体30的面向所述背光模组110的表面上。
所述量子点偏光片20包括一核心层21、一偏光片22及一量子点膜层23，所述偏光片22及所述量子点膜层23位于所述核心层21的相背的两侧。具体地，所述偏光片22通过一第一粘胶层24贴合在所述核心层21的一表面上，所述量子点膜层23通过一第二粘胶层25贴合在所述核心层21的另一表面上。所述量子点膜层23面向所述背光模组110。
在本发明一可选实施例中，所述核心层21的材料包含三醋酸纤维素。
在本发明一可选实施例中，所述偏光片22为碘系偏光膜、或染料系偏光膜；所述偏光片22的材料包含聚乙烯醇。
所述量子点膜层23为含有量子点的膜材，其可以是由量子点与其他材料混合后经成膜工艺得到的量子点膜，也可以是单独由量子点制备而成的量子点膜。
具体地，所述量子点膜层23内的量子点可以为一种或多种的混合，优选地，所述量子点膜层23中的量子点为多种量子点的组合，例如发红光的量子点和发绿光的量子点，以达到较好的色域提升效果和混合效果。
具体地，所述量子点膜层23内的量子点的红光材料包括CdSe、Cd2SeTe及InAs等中的一种或多种；所述量子点膜层23内的量子点的绿光材料包括ZnCdSe2、InP及Cd2SSe等中的一种或多种。
具体地，所述量子点可以为经过表面接枝法、或表面包覆法进行改性处理后的量子点，从而可以使其在溶剂中达到更均匀更稳定的混合效果。
具体地，所述量子点为油溶性或水溶性。
优选地，所述量子点为直径为0~20nm的纳米粒子。
具体地，所述量子点膜层23的成膜工艺为喷涂、旋涂、打印、或狭缝涂布等工艺。
具体地，当光从所述发光元件11射出时，经所述量子点膜层23后激发出较窄半高宽的激发光，从而可提升显示装置的色域范围，改善画面品质。这是由于量子点本身具备光转换能力，在受到蓝光激发的情况下，发生电子跃迁，而后以荧光辐射的形式完成电子空穴的复合；作为典型的零维纳米材料，量子点在各个方向均具有量子限域范围内的尺寸，因此其荧光辐射不存在方向选择性，受激发后可以360°无差别地辐射荧光，从而能够有效平衡液晶显示器的各视角亮度。
所述量子点偏光片20可用作液晶显示面板的下偏光片；由于量子点膜层23中的量子点具有发光特性，从而可以起到增加色域覆盖率的作用。所述量子点偏光片20既保证了偏光性，还能够有效提高显示装置100的色域覆盖率，同时还能实现显示装置100的广视角，且制备工艺简单。
其中，所述显示面板主体30包括一第一基板(图未示)、一第二基板(图未示)及位于所述第一基板和所述第二基板之间的液晶层。其中，所述第一基板为阵列基板，所述第二基板为彩膜基板，所述偏光片22形成在所述第一基板的靠近所述背光模组110的表面上。
其中，所述显示面板120的第一基板上还可以形成有一第二量子点膜层(图未示)，第二量子点膜层位于所述第一基板和所述偏光片22之间。所述第二量子点膜层的结构及材料与所述第一量子点膜层23的结构和材质相同。第二量子点膜层可以进一步提高显示装置100的色域覆盖率，同时还能实现显示装置100的广视角。
在其他实施例中，所述量子点膜层23和所述偏光片22还可以不复合在一起，所述量子点膜层23直接形成在所述显示面板120的面向所述背光模组110的一侧表面上。
所述量子点显示装置100还可以包括一上偏振片(图未示)，所述上偏光片形成在所述第二基板的远离所述第一基板的表面上。
请参阅图1及图3，本发明第二实施例提供一种量子点显示装置200及一背光模组210。所述量子点显示装置200与所述量子点显示装置100的结构相似，其区别点在于：所述量子点显示装置200中的背光模组210与量子点显示装置100的背光模组110的不同。
所述背光模组210包括至少一发光元件41、至少一色转换层42、一反射片43及一底板44。所述反射片43位于所述发光元件41的一侧，所述发光元件41及所述反射片43均形成在所述底板44上。
其中，所述发光元件41为蓝光发光元件。在本发明一可选实施例中，所述发光元件41为蓝背光发光二极管。
在本发明第二实施例中，所述色转换层42形成在所述反射片43上，所述色转换层42中包括少量荧光粉421，所述荧光粉421在蓝光的激发下会发出红光、绿光或黄光。也即是说，所述荧光粉421可以为红色荧光粉、绿色荧光粉及黄色荧光粉中的至少一种。具体地，所述荧光粉421的材料可以是钇铝石榴石（YAG）等稀土荧光粉及锑、锰激活的卤磷酸钙荧光粉中的至少一种。
在本发明第二实施例中，以重量百分比计，所述荧光粉421占所述色转换层42的百分比为0.05wt%-0.5wt%。
所述色转换层42呈图案化。所述色转换层42中的荧光粉421被经过所述反射片43反射的光激发，发出红光、绿光或黄光，这里的激发是在光反射过程中进行的。
所述反射片43用于反射照射到所述反射片43上的蓝光，以减少蓝光的损耗。
所述底板44用于驱动所述发光元件41发出蓝光。
所述背光模组210还可以包括一扩散板45，所述扩散板45位于所述发光元件41的上方且位于所述发光元件41的出光方向上。所述量子点偏光片20面向所述扩散板45。在其他实施例中，所述背光模组210还可以不包括所述扩散板45。
当然，在其他实施例中，所述色转换层42可以同时形成在所述发光元件41和所述反射片43上。
请参阅图1及图4，本发明第三实施例提供一种量子点显示装置300及一背光模组310，所述量子点显示装置300与所述量子点显示装置100的结构相似，其区别点在于所述量子点显示装置200中的背光模组310与量子点显示装置100的背光模组110的不同。
所述背光模组310包括至少一发光元件51、至少一色转换层52、一反射片53、一底板54及一扩散板55。所述反射片53与所述发光元件51相邻，所述发光元件51及所述反射片53均形成在所述底板54上，所述扩散板55位于所述发光元件51的出光面一侧。
其中，所述发光元件51为蓝光发光元件。在本发明一可选实施例中，所述发光元件51为蓝背光发光二极管。
在本发明第三实施例中，所述色转换层52形成在所述扩散板55上，所述色转换层52中包括少量荧光粉521，所述荧光粉521在蓝光的激发下会发出红光、绿光或黄光。也即是说，所述荧光粉521可以为红色荧光粉、绿色荧光粉及黄色荧光粉中的至少一种。具体地，所述荧光粉521的材料可以是钇铝石榴石（YAG）等稀土荧光粉及锑、锰激活的卤磷酸钙荧光粉中的至少一种。
在本发明第三实施例中，以重量百分比计，所述荧光粉521占所述色转换层52的百分比为0.05wt%-0.5wt%。
其中，所述色转换层52的面向所述显示面板120的表面被图案化处理，使之形成图案，可以增加出光率。
所述色转换层52中的荧光粉521被经过所述反射片53反射的光激发而发出红光、绿光或黄光是在光反射过程中进行的。
所述色转换层52靠远离所述发光元件51的一侧表面上形成有多个凸起523，所述凸起523可以增大光的扩散范围。
所述发光元件51发出的光经过所述扩散板55扩散后，大部分光穿过所述扩散板55进入所述量子点偏光片20中，小部分光穿过所述扩散板55并照射到所述色转换层52中的所述荧光粉521上，使得所述荧光粉521发出红光、绿光或黄光。
所述反射片53用于反射照射到所述反射片53上的蓝光，以减少蓝光的损耗。
请参阅图1及图5，本发明第四实施例提供一种量子点显示装置400及一背光模组410，所述量子点显示装置400与所述量子点显示装置100的结构相似，其区别点在于所述量子点显示装置400中的背光模组410与量子点显示装置100的背光模组110的不同。
所述背光模组410包括至少一发光元件61、一反射片63、一底板64及一扩散板65。所述反射片63位于所述发光元件61的一侧，所述发光元件61及所述反射片63均形成在所述底板64上，所述发光元件61与所述底板64电连接，所述扩散板65位于所述发光元件61的上方且位于所述发光元件61的出光方向上。
其中，所述发光元件61为蓝光发光元件。在本发明一可选实施例中，所述发光元件61为蓝背光发光二极管。所述反射片63用于反射照射到所述反射片63上的蓝光，以减少蓝光的损耗。
所述扩散板65是透明的扩散板。优选地，所述扩散板的穿透率大于90%。将所述背光模组410的所述扩散板65设置为透明的扩散板，可以增加背光的透过率，进而减少背光的损耗，以提升发光元件的能效。在本发明中，所述能效可以提升10%~30%。
当然，在其他实施例中，所述背光模组110、210、310及410可以择一或组合应用到VA和IPS两种液晶显示模式中。也即是说，所述色转换层可以同时形成在所述发光元件、所述反射片及所述扩散板中的任意两个或三个之上，还可以在将扩散板设置成透明扩散板的同时，包括色转换层，并且色转换层可以设置在所述发光元件、所述反射片及所述扩散板中的至少一个之上。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种背光模组，包括：
    发光元件，所述发光元件发蓝光；及
    色转换层，所述色转换层中包括荧光粉，所述荧光粉在蓝光的激发下发出红光、绿光和黄光中的至少一种。
  2. 如权利要求1所述的背光模组，其中，所述色转换层中，所述荧光粉占所述色转换层的重量百分比为0.05wt%-0.5wt%。
  3. 如权利要求2所述的背光模组，其中，所述荧光粉材料为稀土荧光粉或锑、锰激活的卤磷酸钙荧光粉。
  4. 如权利要求3所述的背光模组，其中，所述色转换层为覆盖所述发光元件的封装层。
  5. 如权利要求4所述的背光模组，其中，所述色转换层还包括封胶层，所述封胶层至少部分包覆所述发光元件，所述荧光粉均匀分散在所述封胶层内。
  6. 如权利要求3所述的背光模组，其中，所述背光模组包括：
    基板，所述发光元件形成在所述基板上；
    反射片，位于所述基板上表面且与所述发光元件相邻；
    所述色转换层位于所述反射片的远离所述基板的一侧表面。
  7. 如权利要求3所述的背光模组，其中，所述背光模组还包括：
    扩散板，位于所述发光元件的出光面一侧；
    所述色转换层形成在所述扩散板的表面。
  8. 如权利要求7所述的背光模组，其中，所述色转换层的远离所述扩散板的表面上形成有多个凸起。
  9. 如权利要求7所述的背光模组，其中，所述扩散板为穿透率大于90%的透明扩散板。
  10. 一种量子点显示装置，其中，所述量子点显示装置包括：
    背光模组；所述背光模组包括：
    发光元件，所述发光元件发蓝光；及
    色转换层，所述色转换层中包括荧光粉，所述荧光粉在蓝光的激发下发出红光、绿光和黄光中的至少一种；及
    显示面板，位于所述背光模组的出光面的一侧，且所述显示面板包括量子点膜层。
  11. 如权利要求10所述的量子点显示装置，其中，所述显示面板还包括偏光片，所述量子点膜层形成在所述偏光片上。
  12. 如权利要求10所述的量子点显示装置，其中，所述色转换层中，所述荧光粉占所述色转换层的重量百分比为0.05wt%-0.5wt%。
  13. 如权利要求12所述的量子点显示装置，其中，所述荧光粉材料为稀土荧光粉或锑、锰激活的卤磷酸钙荧光粉。
  14. 如权利要求13所述的量子点显示装置，其中，所述色转换层为覆盖所述发光元件的封装层。
  15. 如权利要求13所述的量子点显示装置，其中，所述背光模组包括：
    基板，所述发光元件形成在所述基板上；
    反射片，位于所述基板上表面且与所述发光元件相邻；
    所述色转换层位于所述反射片的远离所述基板的一侧表面。
  16. 如权利要求13所述的量子点显示装置，其中，所述背光模组还包括：
    扩散板，位于所述发光元件的出光面一侧；
    所述色转换层形成在所述扩散板的表面。
  17. 如权利要求16所述的量子点显示装置，其中，所述色转换层的远离所述扩散板的表面上形成有多个凸起。
  18. 如权利要求16所述的量子点显示装置，其中，所述扩散板为穿透率大于90%的透明扩散板。
  19. 如权利要求14所述的量子点显示装置，其中，所述色转换层还包括封胶层，所述封胶层至少部分包覆所述发光元件，所述荧光粉均匀分散在所述封胶层内。
  20. 如权利要求19所述的量子点显示装置，其中，所述封胶层的材质为压敏胶或紫外光固化胶。
PCT/CN2021/091484 2021-04-22 2021-04-30 背光模组及量子点显示装置 WO2022222181A1 (zh)

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