WO2017219397A1 - Lcd显示装置、基于量子点的背光模组及其制作方法 - Google Patents

Lcd显示装置、基于量子点的背光模组及其制作方法 Download PDF

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Publication number
WO2017219397A1
WO2017219397A1 PCT/CN2016/089709 CN2016089709W WO2017219397A1 WO 2017219397 A1 WO2017219397 A1 WO 2017219397A1 CN 2016089709 W CN2016089709 W CN 2016089709W WO 2017219397 A1 WO2017219397 A1 WO 2017219397A1
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Prior art keywords
guide plate
quantum dots
light guide
monochromatic light
light source
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Ceased
Application number
PCT/CN2016/089709
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English (en)
French (fr)
Inventor
王亚楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US15/116,905 priority Critical patent/US10317601B2/en
Publication of WO2017219397A1 publication Critical patent/WO2017219397A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0003—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 doped with fluorescent agents
    • 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
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
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    • 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
    • G—PHYSICS
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    • 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
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    • 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
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    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • 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 flat panel display technologies, and in particular, to an LCD display device, a quantum dot based backlight module, and a method of fabricating the same.
  • quantum dots Quantum Dots (QDs for short) is a nano-scale material with concentrated luminescence spectrum, high color purity, and easy luminescence color through the size, structure or composition of quantum dot materials. These characteristics can be applied by using quantum dots. In the display device to effectively enhance the color gamut and color reproduction capabilities of the display device.
  • the invention provides an LCD display device, a quantum dot-based backlight module and a manufacturing method thereof.
  • the quantum dot is used on the backlight module, so that the backlight module can realize thin transparent display and improve the color gamut display effect.
  • a first aspect of the present invention provides a quantum dot-based backlight module including a monochromatic light source and a light guide plate.
  • the monochromatic light source is disposed on a side of the light guide plate, and the lower surface of the light guide plate is formed with a plurality of recessed portions, and the recessed portion is formed therein.
  • the transparent dielectric layer and the metal reflective layer are sequentially coated, wherein the transparent dielectric layer is doped with dichroic quantum dots, and the wavelength of the monochromatic light emitted by the monochromatic light source is different from the wavelength of the dichroic quantum dots.
  • the monochromatic light source is a blue light emitting diode
  • the two-color quantum dots are red quantum dots and green quantum dots.
  • the lower surface of the light guide plate is further formed with a flat portion connecting the plurality of recessed portions.
  • the flat portion is a transparent structure.
  • a second aspect of the present invention provides an LCD display device including a display panel and a backlight module.
  • the backlight module includes a monochromatic light source and a light guide plate.
  • the monochromatic light source is disposed on a side of the light guide plate, and the lower surface of the light guide plate is formed.
  • a plurality of depressed portions are sequentially coated with a transparent dielectric layer and a metal reflective layer, wherein the transparent dielectric layer is doped with dichroic quantum dots, and the wavelength of the monochromatic light emitted by the monochromatic light source and the wavelength of the dichroic quantum dots are respectively Not the same.
  • the monochromatic light source is a blue light emitting diode
  • the two-color quantum dots are red quantum dots and green quantum dots.
  • the lower surface of the light guide plate is further formed with a flat portion connecting the plurality of recessed portions, and the flat portion has a transparent structure.
  • a third aspect of the present invention provides a method for fabricating a backlight module, including:
  • Patterning etching is performed on the lower surface of the light guide plate by using a photoresist to form a plurality of recessed portions and a flat portion connecting the recessed portions on the lower surface of the light guide plate;
  • the metal reflective layer and the transparent dielectric layer on the flat portion are removed.
  • the production method also includes:
  • a monochromatic light source is disposed on the side of the light guide plate, and the wavelength of the monochromatic light emitted by the monochromatic light source is different from the wavelength of the two-color quantum dot.
  • the monochromatic light source is a blue light emitting diode
  • the two-color quantum dots are red quantum dots and green quantum dots.
  • the beneficial effects of the present invention are: different from the prior art, the LCD display device of the present invention, the backlight module uses a side light-introducing light guide plate, and the monochromatic light source is disposed on one side of the light guide plate, a plurality of recessed portions are formed on a lower surface of the light guide plate, and a transparent dielectric layer doped with a dichroic quantum dot and a metal reflective layer are sequentially coated in the recessed portion, and the structure of the light guide plate is optimized by the above manner to realize a thin transparent display, and The monochromatic light emitted by the monochromatic light source is mixed with the two-color quantum dots to emit white light, thereby realizing the excellent light-emitting characteristics of the quantum dots, improving the wavelength distribution of the light emitted by the light guide plate, and improving the color gamut performance of the display panel.
  • FIG. 1 is a schematic flow chart of a method for fabricating a backlight module according to an embodiment of the invention
  • FIG. 2 is a schematic view showing a plurality of recessed portions and flat portions formed on a lower surface of a light guide plate of the backlight module of FIG. 1;
  • FIG. 3 is a schematic view of the surface region of the depressed portion of FIG. 2 and a transparent dielectric layer doped with a dichroic quantum dot on the flat portion;
  • FIG. 4 is a schematic view of the metal reflective layer on the transparent dielectric layer of FIG. 3;
  • FIG. 5 is a schematic structural view of a quantum dot-based backlight module formed by the fabrication method of FIG. 1;
  • FIG. 6 is an enlarged schematic view showing a recessed portion of the backlight module of FIG. 5;
  • FIG. 7 is a schematic structural diagram of an LCD display device according to an embodiment of the present invention.
  • FIG. 1 is a schematic flow chart of a method for fabricating a backlight module according to an embodiment of the present invention. As shown in FIG. 1, the manufacturing method of the backlight module 10 of this embodiment includes:
  • a light guide plate 100 is provided.
  • Light guide plate 100 (light guide Plate; referred to as LGP) is a high-tech material that uses optical grade acrylic (PMMA, methyl methacrylate) or PC (polycarbonate), mixed with extremely high reflectivity and does not absorb light, printed on the underside of PMMA or PC sheet. The upper light spot is formed.
  • PMMA optical grade acrylic
  • PC polycarbonate
  • Pattern etching is performed on the lower surface of the light guide plate 100 by using the photoresist 105 to form a plurality of recessed portions 101 and a flat portion 102 connecting the recessed portions 101 on the lower surface of the light guide plate 100.
  • a transparent photoresist 105 material is coated on the lower surface of the light guide plate 100 by spin coating or slit coating, and the photoresist 105 material is further processed using a photomask (not shown). Exposure and development process.
  • the photomask comprises a light transmitting portion and an opaque portion, and the light transmitting portion and the opaque portion are disposed adjacent to each other, and in the process of exposing the light guide plate 100 coated with the photoresist 105, corresponding to the mask
  • the photoresist 105 of the light portion is polymerized and cured under illumination, and the photoresist 105 corresponding to the opaque portion of the mask is not cured by polymerization under illumination.
  • the cured photoresist 105 is not washed away and is retained, while the uncured photoresist 105 is washed away by the developer and corresponds to the uncured photoresist.
  • the light guide plate 100 under 105 is also partially washed away by the developer to form spaced apart recess portions 101 and flat portions 102 connecting the recess portions 101, as shown in FIG. 2, and the outer surface of the flat portion 102 remains. Photoresist 105.
  • the plurality of recesses 101 and the flat portions 102 connecting the recesses 101 may be formed by patterning on the lower surface of the light guide plate 100 using a dry etching process.
  • a transparent dielectric layer 103 doped with the dichroic quantum dots 104 is coated on the surface region of the depressed portion 101 and on the flat portion 102.
  • the material of the transparent dielectric layer 103 is formed by mixing red quantum dots 1041, green quantum dots 1042, and transparent medium 1031.
  • the surface area of the depressed portion 101 on the lower surface of the light guide plate 100 is applied by spin coating or slit coating.
  • the transparent dielectric layer 103 doped with the red quantum dots 1041 and the green quantum dots 1042 is coated on the flat portion 102.
  • the thickness of the transparent dielectric layer 103 of the surface region of the recessed portion 101 is larger than that of the transparent medium on the flat portion 102.
  • the thickness of the layer 103, however, the recess 101 is not completely filled by the transparent dielectric layer 103, and those skilled in the art can adjust the curvature and size of the recess 101 by adjusting the thickness of the transparent dielectric layer 103 of the surface region of the recess 101. .
  • the transparent dielectric layer 103 doped with the dichroic quantum dots 104 is coated on the light-guide plate 100 that has been patterned, as shown in FIG. 3 , wherein the flat portion 102 is sequentially covered with the photoresist 105 and transparent.
  • the dielectric layer 103, the photoresist 105 on the flat portion 102, is retained in the exposure and development process of the previous step.
  • the surface area of the depressed portion 101 has only the transparent dielectric layer 103.
  • the metal reflective layer 106 is further formed on the light guide plate 100 on which the transparent dielectric layer 103 is formed by physical vapor deposition.
  • the metal reflective layer 106 covers the transparent dielectric layer 103 on the surface region of the recess 101 and covers the transparent dielectric layer 103 on the flat portion 102.
  • FIG. 4 The schematic view after vapor deposition of the metal reflective layer on the transparent dielectric layer 103 of the light guiding layer is shown in FIG. 4 .
  • the metal reflective layer 106 and the transparent dielectric layer 103 on the flat portion 102 are sequentially removed by using an etching process, and the photoresist 105 on the flat portion 102 is further removed.
  • the etching process used is a conventional process, and details are not described herein. .
  • a monochromatic light source 107 is disposed on the side of the light guide plate 100.
  • the backlight module 10 is formed by vapor deposition.
  • the wavelength of the monochromatic light emitted by the monochromatic light source 107 is smaller than the wavelength of the quantum dots doped in the transparent dielectric layer 103.
  • the monochromatic light source 107 preferably has blue light emission corresponding to the wavelengths of the red quantum dots 1041 and the green quantum dots 1042.
  • the diode 107 (in the present invention, the monochromatic light source and the blue light emitting diode are uniformly used with the reference numeral 107), wherein the wavelength of the blue light is smaller than the wavelengths of the red light and the green light.
  • a blue light emitting diode 107 is disposed on one side of the light guide plate 100. Therefore, the blue light emitted by the blue light emitting diode 107 excites the red quantum dot 1041 and the green quantum dot 1042, and the blue light is incident on the metal reflective layer 106 and the transparent medium of the light guide plate 100. After the layer 103, the reflected light is mixed into white light, so that the monochromatic light source 107 in the backlight module 10 can improve the color gamut performance of the display panel 20 by utilizing the excellent luminescent performance of the quantum dots.
  • the monochromatic source 107 can select a monochromatic illuminator that can have other wavelengths
  • the dichroic quantum dot 104 can select a quantum dot having a different wavelength than the wavelength of the ray emitted by the monochromatic illuminator.
  • quantum doping of other wavelengths may be used for mixed doping, which is not limited herein.
  • the wavelength of the dichroic quantum dot 104 is greater than the wavelength of the light emitted by the monochromatic illuminator.
  • the monochromatic light source 107 can select the violet light emitting diode as the monochromatic light source 107, and the dichroic quantum dot 104 can select the yellow quantum dot and the blue quantum dot or the blue quantum dot that match the wavelength of the violet light emitted by the violet light emitting diode. , a mixture of red quantum dots and green quantum dots.
  • the backlight module 10 includes a light guide plate 100 and a monochromatic light source 107.
  • the monochromatic light source 107 is disposed on one side of the light guide plate 100.
  • the lower surface of the light guide plate 100 is formed with a plurality of recessed portions 101 and a flat portion 102 connecting the recessed portions 101.
  • the recessed portion 101 is sequentially coated with a transparent dielectric layer 103 and a metal reflective layer 106, and the transparent dielectric layer 103 is doped therein.
  • the monochromatic light source 107 is preferably a blue light emitting diode 107.
  • the dichroic quantum dots 104 doped in the transparent dielectric layer 103 are red quantum dots 1041 and green quantum dots 1042 matched with the blue light emitting diode 107.
  • the illuminating performance improves the wavelength distribution of the light emitted by the light guide plate 100 to achieve a high color gamut display effect.
  • An enlarged schematic view of the recessed portion 101 is shown in FIG. 6.
  • the flat portion 102 is a transparent structure, which does not have reflective performance, and the transparent non-reflective structure of the flat portion 102 can cause the backlight module 10 to have a low brightness or a light source when the monochromatic light source 107 is low. Transparent display using ambient light.
  • other optical components are disposed on the light guide plate 100.
  • the monochromatic light source 107 can select an illuminant that can have other wavelengths, and the transparent dielectric layer 103 can be doped to match the wavelength of the light emitted by the other illuminants.
  • Quantum dots having other wavelengths generally require that the wavelength of the monochromatic light emitted by the monochromatic light source 107 be smaller than the wavelength of the light emitted by the excited quantum dots, that is, the monochromatic light source 107 emits a monochromatic light having a wavelength smaller than that of the transparent dielectric layer.
  • the wavelength of the quantum dots doped in 103 is not limited.
  • the spectrum of the monochromatic light source needs to be complementary to the spectrum of the quantum dot, so that the monochromatic light and the quantum dot are mixed to emit white light.
  • FIG. 7 is a schematic structural diagram of an LCD display device according to an embodiment of the present invention.
  • the LCD display device 1 of the present embodiment includes a display panel 20 and a backlight module 10 , wherein the display panel 20 is a conventional liquid crystal display panel 20 , including an array substrate 201 , a color filter substrate 202 , and two The liquid crystal layer 203 between the substrates, the backlight module 10 is the backlight module 10 of the above embodiment, and details are not described herein.
  • the LCD display device 1 of the present embodiment can improve the wavelength distribution of the light emitted by the light guide plate 100 by utilizing the excellent luminescent properties of the quantum dots, so that the light emitted from the monochromatic light source 107 has a higher color expression, and the color of the display panel 20 is improved.
  • the LCD display device, the quantum dot-based backlight module, and the manufacturing method thereof are different from the prior art, wherein the backlight module adopts a side-in type structure, and the monochromatic light source is disposed on the light guide plate.
  • the backlight module adopts a side-in type structure
  • the monochromatic light source is disposed on the light guide plate.
  • One side, and a plurality of recesses are formed on the lower surface of the light guide plate, and the surface area of the recessed portion is sequentially coated with a transparent medium layer doped with dichroic quantum dots and a metal reflective layer, thereby causing monochromatic light emitted by the monochromatic light source
  • white light is emitted, thereby realizing the excellent light-emitting characteristics of the quantum dots, improving the wavelength distribution of the light emitted by the light guide plate, and improving the color gamut performance of the display panel.

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Abstract

一种LCD显示装置（1）、基于量子点的背光模组（10）及其制作方法，其中，背光模组（10）采用侧入式结构，将发出单色光的背光源（107）设置在导光板（100）的一侧，通过在导光板（100）的下表面形成多个凹陷部（101），凹陷部（101）内依次涂覆掺杂有二色量子点（104）的透明介质层（103）及金属反射层（106）。因此，优化了导光板（100）的结构，从而使得单色光源（107）发出的单色光在经过导光板（100）的二色量子点（104）混合后射出白光，实现了利用量子点优异的发光特性，改善导光板（100）发出的光线波长分布，提高显示面板的色域表现，实现薄型透明显示。

Description

LCD显示装置、基于量子点的背光模组及其制作方法
【技术领域】
本发明涉及平板显示技术领域，特别是涉及LCD显示装置、基于量子点的背光模组及其制作方法。
【背景技术】
随着科技的进步，显示行业的呈现方式也逐渐趋于多样化，厚度更薄，颜色更艳丽，显示更逼真，应用更广泛。其中，量子点（Quantum Dots，简称QDs）是一种纳米级材料，具有发光光谱集中，色彩纯度较高，且发光颜色可通过量子点材料的尺寸、结构或成分进行简易调节等特性，利用量子点的这些特性可以应用在显示装置中以有效提升显示装置的色域及色彩还原能力。
【发明内容】
本发明提供一种LCD显示装置、基于量子点的背光模组及其制作方法，通过在背光模组上使用量子点，使得背光模组可以实现薄型透明显示，并且提高色域显示效果。
本发明的第一方面提供一种基于量子点的背光模组，包括单色光源及导光板，单色光源设置于导光板的侧边，导光板的下表面形成有多个凹陷部，凹陷部内依次涂覆有透明介质层及金属反射层，其中透明介质层中掺杂有二色量子点，单色光源发出的单色光的波长与二色量子点的波长各不相同。
其中，单色光源为蓝光发光二极管，二色量子点为红色量子点及绿色量子点。
其中，导光板的下表面还形成有连接多个凹陷部的平坦部。
其中，平坦部为透明结构。
本发明的第二方面提供一种LCD显示装置，包括显示面板及背光模组，背光模组包括单色光源及导光板，单色光源设置于导光板的侧边，导光板的下表面形成有多个凹陷部，凹陷部内依次涂覆有透明介质层及金属反射层，其中透明介质层中掺杂有二色量子点，单色光源发出的单色光的波长与二色量子点的波长各不相同。
其中，单色光源为蓝光发光二极管，二色量子点为红色量子点及绿色量子点。
其中，导光板的下表面还形成有连接多个凹陷部的平坦部，平坦部为透明结构。
本发明的第三方面提供一种背光模组的制作方法，包括：
提供一导光板；
在导光板的下表面采用光刻胶进行图案刻蚀，以在导光板的下表面形成多个凹陷部和连接凹陷部的平坦部；
在凹陷部的表面区域及在平坦部上涂覆掺杂有二色量子点的透明介质层；
在透明介质层上蒸镀金属反射层；
去除平坦部上的金属反射层及透明介质层。
其中，制作方法还包括：
在导光板的侧边设置单色光源，单色光源发出的单色光的波长与二色量子点的波长各不相同。
其中，单色光源为蓝光发光二极管，二色量子点为红色量子点及绿色量子点。
通过上述方案，本发明的有益效果是：区别于现有技术，本发明的LCD显示装置，背光模组使用侧入光式的导光板，将单色光源设置在导光板的一侧，通过在导光板的下表面形成多个凹陷部，并在凹陷部内依次涂覆掺杂有二色量子点的透明介质层及金属反射层，通过以上方式优化导光板的结构，实现薄型透明显示，并且可以使得单色光源发出的单色光线与二色量子点混合后发出白光，实现利用量子点优异的发光特性，改善导光板发出的光线波长分布，提高显示面板的色域表现。
【附图说明】
图1是本发明一实施例的背光模组的制作方法的流程示意图；
图2是图1中背光模组的导光板下表面形成多个凹陷部和平坦部的示意图；
图3是图2中在凹陷部的表面区域及在平坦部上涂覆掺杂有二色量子点的透明介质层后的示意图；
图4是图3中在透明介质层上蒸镀金属反射层后的示意图；
图5是由图1的制作方法形成的基于量子点的背光模组的结构示意图；
图6是图5中的背光模组的凹陷部的放大示意图；
图7是本发明一实施例的LCD显示装置的结构示意图。
【具体实施方式】
为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚、明白，以下结合附图和实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
请参看图1，图1是本发明一实施例的背光模组的制作方法的流程示意图。如图1所示，本实施例的背光模组10的制作方法包括：
S11：提供一导光板100。
导光板100（light guide plate；简称LGP）为利用光学级的亚克力（PMMA，甲基丙烯酸甲脂）或PC（聚碳酸酯）板材，混合具有极高反射率且不吸光的高科技材料，在PMMA或PC板材底面印上导光点形成。
S12：在导光板100的下表面采用光刻胶105进行图案刻蚀，以在导光板100的下表面形成多个凹陷部101和连接凹陷部101的平坦部102。
采用旋涂或狭缝式涂布的方式在所述导光板100的下表面涂覆上一层透明的光刻胶105材料，并进一步使用光罩（图未示）对光刻胶105材料进行曝光、显影的制程。其中，光罩包括透光部和不透光部，透光部和不透光部相邻设置，在对涂覆有光刻胶105的导光板100进行曝光的过程中，对应于光罩透光部的光刻胶105在光照下发生聚合反应固化，对应于光罩的不透光部的光刻胶105在光照下不发生聚合反应而未固化。在进一步的显影制程中，固化的光刻胶105不会被洗掉，从而被保留下来，而未固化的光刻胶105将会被显影液清洗掉，并且，对应于未固化的光刻胶105下的导光板100也会部分被显影液清洗掉，从而形成间隔设置的凹陷部101和连接该凹陷部101的平坦部102，如图2所示，并且平坦部102的外表面还保留有光刻胶105。
在其他的实施例中，也可以使用干刻工艺在导光板100的下表面进行图案化处理形成多个凹陷部101和连接该凹陷部101的平坦部102。
S13：在凹陷部101的表面区域及在平坦部102上涂覆掺杂有二色量子点104的透明介质层103。
透明介质层103的材料为由红色量子点1041、绿色量子点1042及透明介质1031混合形成。本实施例中通过将红色量子点1041及绿色量子点1042与透明介质1031进行混合后，采用旋涂或狭缝式涂布的方式在导光板100的下表面的凹陷部101的表面区域及在平坦部102上涂覆该掺杂有红色量子点1041及绿色量子点1042的透明介质层103。
由于导光板100已经进行图案化处理形成有多个凹陷部101及连接该凹陷部101的平坦部102，因此，凹陷部101的表面区域的透明介质层103的厚度大于平坦部102上的透明介质层103的厚度，但是，凹陷部101不会被透明介质层103完全填满，本领域技术人员可通过调整凹陷部101的表面区域的透明介质层103的厚度进而调整凹陷部101的弧度及大小。
其中，在已经图案化处理的导光板100上涂覆掺杂有二色量子点104的透明介质层103后的图如图3所示，其中，平坦部102上依次覆盖光刻胶105及透明介质层103，平坦部102上的光刻胶105是在上一步骤的曝光显影制程中保留下来的。凹陷部101的表面区域仅有透明介质层103。
S14：在透明介质层103上蒸镀金属反射层106。
采用物理气相沉积法在形成有透明介质层103的导光板100上进一步形成金属反射层106。其中，金属反射层106覆盖在凹陷部101表面区域的透明介质层103上及覆盖在平坦部102上的透明介质层103上。
其中，在导光层的透明介质层103上蒸镀金属反射层后的示意图如图4所示。
S15：去除平坦部102上的金属反射层106及透明介质层103。
使用刻蚀工艺依次去除平坦部102上的金属反射层106及透明介质层103，并且进一步除平坦部102上的光刻胶105，其中所采用的刻蚀工艺为传统工艺，在此不再赘述。
S16：在导光板100的侧边设置单色光源107。
在本实施例中，使用蒸镀法制作背光模组10，通常是要求单色光源107发出的单色光的波长小于透明介质层103中掺杂的量子点的波长。例如，当透明介质层103中掺杂的二色量子点104为红色量子点1041及绿色量子点1042时，对应于红色量子点1041及绿色量子点1042的波长，单色光源107优选为蓝光发光二极管107（在本发明中，单色光源及蓝光发光二极管统一使用107标号），其中，蓝光的波长小于红光及绿光的波长。在导光板100的一侧设置蓝光发光二极管107，因此，蓝光发光二极管107发出的蓝色光会激发红色量子点1041及绿色量子点1042，在蓝色光射向导光板100的金属反射层106及透明介质层103后，反射出来的光被混合成白色光出射，从而使得背光模组10中的单色光源107可以利用量子点优异的发光性能，提高显示面板20的色域表现。
在其他实施例中，单色光源107可以选择可以具有其他波长的单色发光体，二色量子点104可以选择与单色发光体发出的光线的波长不同的具有其他波长的量子点，通过在形成透明介质层103的步骤中使用其他波长的量子点进行混合掺杂即可，在此不作限制，优选的，二色量子点104的波长大于单色发光体发出的光线的波长。例如，单色光源107可以选择紫光发光二极管为单色光源107，二色量子点104可以选择与紫光发光二极管发出的紫光的波长相匹配的黄色量子点及蓝色量子点或者是蓝色量子点、红色量子点及绿色量子点的混合。
由上述方法制得的基于量子点的背光模组的结构示意图如图5所示，背光模组10包括导光板100及单色光源107，单色光源107设置于导光板100的一侧。其中，导光板100的下表面形成有多个凹陷部101及连接该凹陷部101的平坦部102，凹陷部101内依次涂覆有透明介质层103及金属反射层106，透明介质层103中掺杂有二色量子点104。在本实施例中，单色光源107优选为蓝光发光二极管107，透明介质层103中掺杂的二色量子点104为与蓝光发光二极管107相匹配的红色量子点1041及绿色量子点1042，以使得蓝光发光二极管107发出的蓝色光在射向导光板100时，经过金属反射层106及透明介质层103后，与红色量子点1041及绿色量子点1042混合后射出白色光，实现利用量子点的优异发光性能，改善导光板100发出的光线波长分布，达到高色域的显示效果。其中，凹陷部101的放大示意图如图6所示。
在本实施例中，平坦部102为透明结构，其并不具有反射性能，平坦部102的透明不反射结构可以使得背光模组10在单色光源107亮度较低或光源被关闭的情况下，利用外界环境光进行透明显示。此外，导光板100上还设置有其他未图示的光学组件。
在其他实施例中，如果光源选择为单色光源107，则单色光源107可以选择可以具有其他波长的发光体，透明介质层103可以掺杂与其他发光体所发出的光的波长相匹配的具有其他波长的量子点，通常是要求单色光源107发出的单色光的波长小于被激发的量子点所发出的光的波长，即单色光源107发出的单色光的波长小于透明介质层103中掺杂的量子点的波长。进一步的，如果要使单色光源发出的单色光与量子点发出的光混合为白光，则需要单色光源的光谱与量子点的光谱互补，以使得单色光与量子点混合后射出白光。
请进一步参看图7，图7是本发明一实施例的LCD显示装置的结构示意图。如图7所示，本实施例的LCD显示装置1包括显示面板20及背光模组10，其中，显示面板20为传统的液晶显示面板20，包括阵列基板201、彩膜基板202及设置于两个基板之间的液晶层203，背光模组10为上述实施例的背光模组10，在此不再赘述。本实施例的LCD显示装置1可以利用量子点的优异发光性能，改善导光板100发出的光线的波长分布，使得单色光源107发出的光具有更高的色彩表现力，提高显示面板20的色域表面，并且由于平坦部102的无反射透明结构，使得在背光模组10中的单色光源107的发光亮度较低或光源被关闭的情况下，可以利用环境光进行透明显示，提高光的利用率。
综上所述，区别于现有技术，本发明的LCD显示装置、基于量子点的背光模组及其制作方法，其中，背光模组采用侧入式结构，将单色光源设置在导光板的一侧，并且在导光板的下表面形成多个凹陷部，凹陷部的表面区域依次涂覆掺杂有二色量子点的透明介质层及金属反射层，从而使得单色光源发出的单色光在经过导光板的二色量子点混合后射出白光，实现利用量子点优异的发光特性，改善导光板发出的光线的波长分布，提高显示面板的色域表现。
以上参照附图说明了本发明的优选实施例，并非因此局限本发明的权利范围。本领域技术人员不脱离本发明的范围和实质内所作的任何修改、等同替换和改进，均应在本发明的权利范围之内。

Claims (10)

  1. 一种基于量子点的背光模组，其中，包括单色光源及导光板，所述单色光源设置于所述导光板的侧边，所述导光板的下表面形成有多个凹陷部，所述凹陷部内依次涂覆有透明介质层及金属反射层，其中所述透明介质层中掺杂有二色量子点，所述单色光源发出的单色光的波长与所述二色量子点的波长各不相同。
  2. 根据权利要求1所述的背光模组，其中，所述单色光源为蓝光发光二极管，所述二色量子点为红色量子点及绿色量子点。
  3. 根据权利要求1所述的背光模组，其中，所述导光板的下表面还形成有连接所述多个凹陷部的平坦部。
  4. 根据权利要求3所述的背光模组，其中，所述平坦部为透明结构。
  5. 一种LCD显示装置，其中，包括显示面板及背光模组，所述背光模组包括单色光源及导光板，所述单色光源设置于所述导光板的侧边，所述导光板的下表面形成有多个凹陷部，所述凹陷部内依次涂覆有透明介质层及金属反射层，其中所述透明介质层中掺杂有二色量子点，所述单色光源发出的单色光的波长与所述二色量子点的波长各不相同。
  6. 根据权利要求5所述的LCD显示装置，其中，所述单色光源为蓝光发光二极管，所述二色量子点为红色量子点及绿色量子点。
  7. 根据权利要求5所述的LCD显示装置，其中，所述导光板的下表面还形成有连接所述多个凹陷部的平坦部，所述平坦部为透明结构。
  8. 一种背光模组的制作方法，其中，包括：
    提供一导光板；
    在所述导光板的下表面采用光刻胶进行图案刻蚀，以在所述导光板的下表面形成多个凹陷部和连接所述凹陷部的平坦部；
    在所述凹陷部的表面区域及在所述平坦部上涂覆掺杂有二色量子点的透明介质层；
    在所述透明介质层上蒸镀金属反射层；
    去除所述平坦部上的金属反射层及所述透明介质层。
  9. 根据权利要求8的制作方法，其中，所述制作方法还包括：
    在所述导光板的侧边设置单色光源，所述单色光源发出的单色光的波长与所述二色量子点的波长各不相同。
  10. 根据权利要求9的制作方法，其中，所述单色光源为蓝光发光二极管，所述二色量子点为红色量子点及绿色量子点。
PCT/CN2016/089709 2016-06-23 2016-07-12 Lcd显示装置、基于量子点的背光模组及其制作方法 Ceased WO2017219397A1 (zh)

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