WO2017193418A1 - 量子点背光模组 - Google Patents

量子点背光模组 Download PDF

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Publication number
WO2017193418A1
WO2017193418A1 PCT/CN2016/083065 CN2016083065W WO2017193418A1 WO 2017193418 A1 WO2017193418 A1 WO 2017193418A1 CN 2016083065 W CN2016083065 W CN 2016083065W WO 2017193418 A1 WO2017193418 A1 WO 2017193418A1
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WO
WIPO (PCT)
Prior art keywords
quantum dot
light
backlight
guide plate
light guide
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Application number
PCT/CN2016/083065
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English (en)
French (fr)
Inventor
韩梅
程艳
Original Assignee
武汉华星光电技术有限公司
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Application filed by 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to US15/112,430 priority Critical patent/US20180106938A1/en
Publication of WO2017193418A1 publication Critical patent/WO2017193418A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • 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
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • 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
    • 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
    • G02F1/133621—Illuminating devices providing coloured light
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a quantum dot backlight module.
  • TFT-LCD Thin Film Transistor-Liquid Crystal Display
  • LCD TVs mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or laptop screens, etc.
  • PDAs personal digital assistants
  • Most of the liquid crystal displays on the market are backlight type liquid crystal displays, which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to apply a driving voltage on a Thin Film Transistor Array Substrate (TFT Array Substrate) and a Color Filter (CF) to control the rotation direction of liquid crystal molecules between the two substrates.
  • TFT Array Substrate Thin Film Transistor Array Substrate
  • CF Color Filter
  • the backlight module is divided into a side-in type backlight module and a direct-type backlight module according to different incident positions of the light source.
  • a light source such as a cathode fluorescent lamp (CCFL) or a light emitting diode (LED) is disposed behind the liquid crystal panel, and a surface light source is directly formed and supplied to the liquid crystal panel.
  • the side-lit backlight module has a light bar disposed on the side of the liquid crystal panel as a backlight.
  • the color gamut level of TFT liquid crystal display devices is generally about 72%.
  • Quantum Dot backlight module technology has emerged.
  • Quantum dot luminescent materials adhere to quantum size effects, the properties of which vary with the size of the quantum dots. When stimulated by light or electricity, quantum dots emit colored light. The color of the light is related to its nature, so it can be controlled by changing its size.
  • Quantum dot luminescent materials have the advantages of concentrated luminescence spectrum and high color purity. The use of quantum dot luminescent materials in the field of display technology can greatly improve the color gamut of conventional displays and enhance the color reproduction capability of displays.
  • the quantum dot backlight module utilizes the feature of quantum dots, and uses the illumination of the LED backlight to illuminate the quantum dot layer to excite different colors of color light, and partially mixes the color light of the quantum dots to obtain white light, thereby improving the entire backlight module. Glowing effect.
  • the existing quantum dot backlight modules all have the problem of low brightness.
  • FIG. 1 is a schematic structural diagram of a conventional quantum dot backlight module, including: a color filter 1 , a TFT array layer 2 , a quantum dot film 3 , a light guide plate 4 , and The reflector 5 and the blue LED 6 disposed on one side of the light guide plate 4.
  • the blue light emitted by the blue LED 6 is reflected by the reflector 5 and guided by the light guide plate 4, and then incident on the quantum dot film 3, so that the quantum dot material 7 in the quantum dot film 3 excites red and green light and is transmitted through the quantum dot film 3.
  • the blue light is mixed into white light and then incident on the color filter 1 to generate RGB three-color light having a wide color gamut. Since the quantum dot is less efficient than the ordinary LED phosphor, the brightness provided by the quantum dot backlight module is low.
  • FIG. 2 is a schematic structural diagram of another conventional quantum backlight module, including: a color filter 1 ′, a TFT array layer 2 ′, a diffusion film 3 ′, and a light guide plate 4 which are sequentially disposed from top to bottom.
  • the quantum dot tube 7' excites the quantum dot material 8' to generate red and green light and mixes with the blue light transmitted through the quantum dot tube 7' to form white light, and further passes through the reflector 5', the light guide plate 4', and the diffusion film 3'.
  • the color filter substrate 1' is injected to generate RGB three-color light with a wide color gamut.
  • the quantum dot backlight module is provided with a quantum dot tube 7', so that the distance between the blue LED 6' and the light guide plate 4' is increased, and the light guide plate 4 is increased. 'The coupling efficiency is reduced, making it low in brightness.
  • the object of the present invention is to provide a quantum dot backlight module with high luminance and wide color gamut to improve product quality.
  • the present invention firstly provides a quantum dot backlight module, comprising: a light guide plate, a reflector disposed on one side of the light guide plate, a backlight disposed on a side of the light guide plate, and a quantum dot film on the other side of the light guide plate; the surface of the quantum dot film away from the light guide plate is provided with an optical plating layer; the optical plating layer can reflect the light emitted by the backlight to excite the quantum dot film.
  • the backlight is a blue LED; the blue light emitted by the backlight excites the quantum dot film to emit white light.
  • the optical coating can reflect blue light to re-excite the quantum dot film.
  • the optical coating has a reflectance of 40% to 60% for light having a wavelength of 340 nm to 480 nm.
  • the optical plating layer has a reflectance of 50% for light having a wavelength of 340 nm to 480 nm.
  • the present invention also provides a quantum dot backlight module, comprising: a light guide plate, a reflector disposed on one side of the light guide plate, a quantum dot tube disposed on a side of the light guide plate, and a quantum dot tube disposed away from the quantum dot tube a backlight on one side of the light guide plate;
  • the light guide plate is provided with an optical coating on a surface close to the quantum dot tube; the optical plating layer can be reversed The light emitted by the backlight source excites the quantum dot tube.
  • the backlight is a blue LED; the blue light emitted by the backlight excites the quantum dot tube to emit white light.
  • the optical coating is capable of reflecting blue light to re-excite the quantum dot tube.
  • the optical coating has a reflectance of 40% to 60% for light having a wavelength of 340 nm to 480 nm.
  • the optical plating layer has a reflectance of 50% for light having a wavelength of 340 nm to 480 nm.
  • the present invention also provides a quantum dot backlight module, comprising: a light guide plate, a reflector disposed on one side of the light guide plate, a backlight disposed on a side of the light guide plate, and a backlight disposed on the other side of the light guide plate a quantum dot film; the surface of the quantum dot film away from the light guide plate is provided with an optical plating layer; the optical plating layer can reflect the light emitted by the backlight to excite the quantum dot film;
  • the backlight is a blue LED; the blue light emitted by the backlight excites the quantum dot film to emit white light;
  • the optical coating can reflect blue light and re-excite the quantum dot film.
  • the quantum dot backlight module provided by the present invention has a quantum dot film disposed on a side of the light guide plate away from the light reflecting plate and an optical plating layer disposed on a side of the quantum dot film away from the light guiding plate, or a light guiding plate and a backlight source.
  • An optical dot tube is disposed between the quantum dot tube and an optical plating layer is disposed on a side of the light guide plate near the quantum dot tube, and the optical light is used to reflect the monochromatic light emitted by the partial backlight to the quantum dot film or the quantum dot tube. Excitation of its luminescence, increase the excitation efficiency of quantum dot film or quantum dot tube, improve the brightness and color gamut of the quantum dot backlight module, and improve product quality.
  • 1 is a schematic structural view of a conventional quantum dot backlight module
  • FIG. 2 is a schematic structural view of another conventional quantum dot backlight module
  • FIG. 3 is a schematic structural view of a first embodiment of a quantum dot backlight module of the present invention.
  • FIG. 4 is a schematic structural view of a second embodiment of a quantum dot backlight module of the present invention.
  • FIG. 3 is a schematic structural view of a first embodiment of a quantum dot backlight module of the present invention, including: a light guide plate 10, a reflective plate 20 disposed on one side of the light guide plate 10, and a light guide plate 10 disposed on the light guide plate 10. a backlight 30 on the side, and a quantum dot film 40 disposed on the other side of the light guide plate 10;
  • the surface of the quantum dot film 40 away from the light guide plate 10 is provided with an optical plating layer 11; the optical plating layer 11 can reflect the light emitted by the backlight 30 to excite the quantum dot film 40.
  • the quantum dot film 40 includes a quantum dot material 41 that can excite color light of a different color than the monochromatic light emitted by the backlight 30.
  • the backlight 30 is a blue LED and emits blue light outward.
  • the quantum dot material 41 is a red quantum dot material and a green quantum dot material.
  • the quantum dot material 41 is one or more of CdSe, CdS, CdTe, ZnS, ZnSe, CuInS, ZnCuInS.
  • the optical plating layer 11 has a high reflectance to blue light, and can reflect the blue light to re-excite the quantum dot film 40.
  • the optical plating layer 11 has a reflectance of 40% to 60% for light having a wavelength of 340 nm to 480 nm.
  • the optical plating layer 11 has a reflectance of 50% for light having a wavelength of 340 nm to 480 nm.
  • the blue light emitted by the backlight 30 excites the quantum dot film 40 to emit white light.
  • the working process of the first embodiment of the quantum dot backlight module of the present invention is that the backlight 30 emits blue light into the light guide plate 10, is reflected by the light reflecting plate 20, and continues to be guided by the light guide plate 10, so that the backlight 30 is provided.
  • the emitted blue light is incident on the quantum dot film 40, and the quantum dot material 41 in the quantum dot film 40 is excited to emit red light and green light, and the blue light transmitted through the quantum dot film 40 is incident on the optical plating layer 11 because the optical plating layer 11 is blue.
  • the reflectance of the colored light is high, and the partially incident blue light is reflected back into the quantum dot film 40, and the quantum dot material 41 in the quantum dot film 40 is re-excited to emit red light and green light, and the red light and green light excited by the quantum dot material 41 are excited.
  • the light is mixed with the blue light partially transmitted through the optical plating layer 11 by the optical plating layer 11 to form white light, and the backlight is provided. Since the reflectance of the optical coating 11 to blue light is high, that is, the reflectance of light having a wavelength of 340 nm to 480 nm is 40% to 60%, the blue light emitted from the backlight 30 is reflected, and the quantum dot film is excited multiple times.
  • the quantum dot material 41 in 40 emits red light and green light. Compared with the prior art, the quantum dot film excitation efficiency is greatly increased, the brightness and color gamut of the quantum dot backlight module are improved, and the product quality is improved.
  • FIG. 4 is a schematic structural view of a second embodiment of a quantum dot backlight module of the present invention, including: a light guide plate 10', a reflective plate 20' disposed on one side of the light guide plate 10', and disposed on the guide a quantum dot tube 30' on one side of the light plate 10', and a quantum dot tube 30' disposed away from the light guide plate 10' Side backlight 40';
  • the light guide plate 10' is provided with an optical plating layer 11' on the surface close to the quantum dot tube 30'; the optical plating layer 11' can reflect the light emitted from the backlight 40' to excite the quantum dot tube 30'.
  • the quantum dot backlight module further includes a diffusion film 50' disposed on the side of the light guide plate 10' away from the light reflection plate 20'.
  • the quantum dot tube 30' includes a quantum dot material 31' that excites colored light of a different color than the monochromatic light emitted by the backlight 40'.
  • the backlight 40' is a blue LED that emits blue light outward.
  • the quantum dot material 31' is a red quantum dot material and a green quantum dot material.
  • the quantum dot material 31' is one or more of CdSe, CdS, CdTe, ZnS, ZnSe, CuInS, ZnCuInS.
  • the optical plating layer 11' has a high reflectance to blue light, and can reflect blue light to re-excite the quantum dot tube 30'.
  • the optical plating layer 11' has a reflectance of 40% to 60% for light having a wavelength of 340 nm to 480 nm.
  • the optical plating layer 11' has a reflectance of 50% for light having a wavelength of from 340 nm to 480 nm.
  • the blue light emitted by the backlight 40' excites the quantum dot tube 30' to emit white light.
  • the second embodiment of the quantum dot backlight module of the present invention works in that the backlight 40' emits blue light into the quantum dot tube 30', and the quantum dot material 31' in the quantum dot tube 30' emits red light. And the green light, the blue light passing through the quantum dot tube 30' is incident on the optical plating layer 11', and since the optical plating layer 11' has a high reflectance to the blue light, the partially incident blue light is reflected back into the quantum dot tube 30'.
  • the quantum dot material 31' in the quantum dot tube 30' is re-excited to emit red light and green light, and the quantum dot material 31' in the quantum dot tube 30' emits red light and green light through the optical plating layer 11 and partially through the optical plating layer.
  • the blue light of 11' is mixed to form white light, reflected by the light reflecting plate 20, and continues to be guided by the light guide plate 10 to complete the supply of the backlight. Since the reflectance of the optical coating 11 to blue light is high, that is, the reflectance of light having a wavelength of 340 nm to 480 nm is 40% to 60%, the blue light emitted from the backlight 40' can be reflected, and the quantum is excited multiple times.
  • the quantum dot material 31' in the spot tube 30' emits red light and green light. Compared with the prior art, the quantum dot tube excitation efficiency is greatly increased, the brightness and color gamut of the quantum dot backlight module are improved, and the product quality is improved.
  • a quantum dot film is disposed on a side of the light guide plate away from the light reflecting plate, and an optical plating layer is disposed on a side of the quantum dot film away from the light guiding plate, or is disposed between the light guiding plate and the backlight.
  • the quantum dot tube is provided with an optical coating on the side of the light guide plate near the quantum dot tube, and the monochromatic light emitted by the partial backlight is reflected by the optical plating layer under the premise of emitting a white backlight.
  • the light to the quantum dot film or the quantum dot tube re-excites the luminescence, increases the excitation efficiency of the quantum dot film or the quantum dot tube, improves the brightness and color gamut of the quantum dot backlight module, and improves the product quality.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
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  • Liquid Crystal (AREA)

Abstract

一种量子点背光模组，在导光板（10）远离反光板（20）一侧设置量子点薄膜（40）并在量子点薄膜（40）远离导光板（10）一侧设置光学镀层（11），或在导光板（10'）与背光源（40'）之间设置量子点管（30'）并在导光板（10'）靠近量子点管（30'）的一侧设置光学镀层（11'），在完成发出白色背光的前提下，利用光学镀层（11，11'）反射部分背光源（30，40'）发射的单色光至量子点薄膜（40）或量子点管（30'）重新激发其发光，增加量子点薄膜（40）或量子点管（30'）的激发效率，提高量子点背光模组的亮度及色域，提升产品品质。

Description

量子点背光模组 技术领域
本发明涉及液晶显示技术领域，尤其涉及一种量子点背光模组。
背景技术
薄膜晶体管液晶显示器(Thin Film Transistor-Liquid Crystal Display，TFT-LCD)具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。如：液晶电视、移动电话、个人数字助理(PDA)、数字相机、计算机屏幕或笔记本电脑屏幕等，在平板显示领域中占主导地位。现有市场上的液晶显示器大部分为背光型液晶显示器，其包括液晶面板及背光模组(Backlight Module)。液晶面板的工作原理是在薄膜晶体管阵列基板(Thin Film Transistor Array Substrate，TFT Array Substrate)与彩色滤光片基板(Color Filter，CF)上施加驱动电压来控制两基板之间液晶分子的旋转方向，以将背光模组的光线折射出来产生画面。
由于液晶显示面板本身不发光，需要借由背光模组提供的光源来正常显示影像，因此背光模组成为液晶显示器的关键组件之一。背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光模组两种。直下式背光模组是将发光光源例如阴极萤光灯管(Cold Cathode Fluorescent Lamp，CCFL)或发光二极管(Light Emitting Diode，LED)设置在液晶面板后方，直接形成面光源提供给液晶面板。而侧入式背光模组是将LED灯条(Light bar)设于液晶面板的侧后方作为背光源。
目前，TFT液晶显示器件的色域水平一般在72％左右，为了进一步地提高色域水平，量子点(Quantum Dot)背光模组技术应运而生。量子点发光材料遵守量子尺寸效应，其性质随量子点的尺寸变化而变化。当受到光或电的刺激时，量子点会发出有色光线，光线的颜色与其性质有关，因此可以通过改变其尺寸对其发出的光线进行控制。量子点发光材料具有发光光谱集中、色纯度高等优点。将量子点发光材料利用于显示技术领域，可以大幅度提高传统显示器的色域，使显示器的色彩还原能力得到增强。量子点背光模组利用了量子点的这一特点，利用LED背光的照射对量子点层进行照射激发不同颜色的色光，并同部分透过量子点的色光混合得到白光，从而提升整个背光模组的发光效果。但是，现有的量子点背光模组均存在亮度偏低的问题。
请参阅图1，为一种现有的量子点背光模组的结构示意图，包括：由上至下依次设置的彩色滤光片1、TFT阵列层2、量子点薄膜3、导光板4、及反光板5，以及设置于导光板4一侧面的蓝光LED6。蓝光LED6发射的蓝色光经反光板5反射及导光板4导光后射入量子点薄膜3，使量子点薄膜3中的量子点材料7激发红色及绿色光并与透过量子点薄膜3的蓝色光混合成白光后射入彩色滤光片1，产生色域宽的RGB三色光，由于量子点比普通的LED荧光粉激发效率低，使该量子点背光模组提供的亮度偏低。
请参阅图2，为另一种现有的量子背光模组的结构示意图，包括：由上至下依次设置的彩色滤光片1’、TFT阵列层2’、扩散膜3’、导光板4’、及反光板5’，以及设置于导光板4’一侧面的蓝光LED6’及设置在蓝光LED6’与导光板4’之间的量子点管7’，蓝光LED6’发出的蓝色光射入量子点管7’中激发量子点材料8’产生红色及绿色光并与透过量子点管7’的蓝色光混合成白光，进而通过反光板5’、导光板4’、及扩散膜3’射入彩色滤光基片1’，产生色域宽的RGB三色光，该量子点背光模组由于设置了量子点管7’，使蓝光LED6’与导光板4’的距离增加，导光板4’的耦合效率降低，使其亮度偏低。
发明内容
本发明的目的在于提供一种量子点背光模组，具有高发光亮度及宽色域，提升产品品质。
为实现上述目的，本发明首先提供一种量子点背光模组，包括：导光板、设置于所述导光板一面的反光板、设置于所述导光板一侧的背光源、及设置于所述导光板另一面的量子点薄膜；所述量子点薄膜远离导光板的表面设有光学镀层；所述光学镀层能反射背光源发出的光线对量子点薄膜进行激发。
所述背光源为蓝光LED；所述背光源发出的蓝光激发所述量子点薄膜发出白光。
所述光学镀层能反射蓝色光重新激发量子点薄膜。
所述光学镀层对波长为340nm—480nm的光的反射率为40％-60％。
所述光学镀层对波长为340nm—480nm的光的反射率为50％。
本发明还提供一种量子点背光模组，包括：导光板、设置于所述导光板一面的反光板、设置于所述导光板一侧的量子点管、及设置于所述量子点管远离导光板一侧的背光源；
所述导光板在靠近量子点管的表面设有光学镀层；所述光学镀层能反 射背光源发出的光线对量子点管进行激发。
所述背光源为蓝光LED；所述背光源发出的蓝光激发所述量子点管发出白光。
所述光学镀层能反射蓝色光重新激发量子点管。
所述光学镀层对波长为340nm—480nm的光的反射率为40％-60％。
所述光学镀层对波长为340nm—480nm的光的反射率为50％。
本发明还提供一种量子点背光模组，包括：导光板、设置于所述导光板一面的反光板、设置于所述导光板一侧的背光源、及设置于所述导光板另一面的量子点薄膜；所述量子点薄膜远离导光板的表面设有光学镀层；所述光学镀层能反射背光源发出的光线对量子点薄膜进行激发；
其中，所述背光源为蓝光LED；所述背光源发出的蓝光激发所述量子点薄膜发出白光；
其中，所述光学镀层能反射蓝光重新激发量子点薄膜。
本发明的有益效果：本发明提供的量子点背光模组，在导光板远离反光板一侧设置量子点薄膜并在量子点薄膜远离导光板一侧设置光学镀层，或在导光板与背光源之间设置量子点管并在导光板靠近量子点管的一侧设置光学镀层，在完成发出白色背光的前提下，利用光学镀层反射部分背光源发射的单色光至量子点薄膜或量子点管重新激发其发光，增加量子点薄膜或量子点管的激发效率，提高量子点背光模组的亮度及色域，提升产品品质。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为一种现有的量子点背光模组的结构示意图；
图2为另一种现有的量子点背光模组的结构示意图；
图3为本发明的量子点背光模组的第一实施例的结构示意图；
图4为本发明的量子点背光模组的第二实施例的结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图3，为本发明的量子点背光模组的第一实施例的结构示意图，包括：导光板10、设置于所述导光板10一面的反光板20、设置于所述导光板10一侧的背光源30、及设置于所述导光板10另一面的量子点薄膜40；
所述量子点薄膜40远离导光板10的表面设有光学镀层11；所述光学镀层11能反射背光源30发出的光线对量子点薄膜40进行激发。
具体地，所述量子点薄膜40包括可激发出与背光源30发出的单色光不同颜色的色光的量子点材料41。
具体地，在本实施例中，所述背光源30为蓝光LED，向外发射蓝色光。
具体地，所述量子点材料41为红色量子点材料及绿色量子点材料。
优选地，所述量子点材料41为CdSe，CdS，CdTe，ZnS，ZnSe，CuInS，ZnCuInS中的一种或多种。
具体地，所述光学镀层11对蓝色光的的反射率高，能反射蓝色光重新激发量子点薄膜40。
优选地，所述光学镀层11对波长为340nm—480nm的光的反射率为40％-60％。
更优选地，所述光学镀层11对波长为340nm—480nm的光的反射率为50％。
具体地，所述背光源30发出的蓝色光激发所述量子点薄膜40发出白光。
具体地，本发明的量子点背光模组第一实施例的工作过程为：背光源30发射蓝色光进入导光板10，经反光板20反射，并继续由导光板10导光，使背光源30发射的蓝色光射入量子点薄膜40，激发量子点薄膜40中的量子点材料41发出红色光与绿色光，透过量子点薄膜40的蓝色光射入光学镀层11，由于光学镀层11对蓝色光的反射率高，将部分射入的蓝色光反射回量子点薄膜40中，重新激发量子点薄膜40中的量子点材料41发出红色光与绿色光，量子点材料41激发的红色光与绿色光通过光学镀层11与部分透过光学镀层11的蓝色光混合形成白光，完成背光的提供。由于所述光学镀层11对蓝色光的反射率高，即对波长为340nm—480nm的光的反射率为40％-60％，对背光源30发射的蓝色光进行反射，多次激发量子点薄膜40中的量子点材料41发出红色光与绿色光，与现有技术相比，大大增加量子点薄膜的激发效率，提高量子点背光模组的亮度及色域，提升产品品质。
请参阅图4，为本发明的量子点背光模组的第二实施例的结构示意图，包括：导光板10’、设置于所述导光板10’一面的反光板20’、设置于所述导光板10’一侧的量子点管30’、及设置于所述量子点管30’远离导光板10’一 侧的背光源40’；
所述导光板10’在靠近量子点管30’的表面设有光学镀层11’；所述光学镀层11’能反射背光源40’发出的光线对量子点管30’进行激发。
具体地，所述的量子点背光模组还包括设置在所述导光板10’上远离反光板20’一侧的扩散膜50’。
具体地，所述量子点管30’包括可激发出与背光源40’发出的单色光不同颜色的色光的量子点材料31’。
具体地，在本实施例中，所述背光源40’为蓝光LED，向外发射蓝色光。
具体地，所述量子点材料31’为红色量子点材料及绿色量子点材料。
优选地，所述量子点材料31’为CdSe，CdS，CdTe，ZnS，ZnSe，CuInS，ZnCuInS中的一种或多种。
具体地，所述光学镀层11’对蓝色光的的反射率高，能反射蓝色光重新激发量子点管30’。
优选地，所述光学镀层11’对波长为340nm—480nm的光的反射率为40％-60％。
更优选地，所述光学镀层11’对波长为340nm—480nm的光的反射率为50％。
具体地，所述背光源40’发出的蓝光激发所述量子点管30’发出白光。
具体地，本发明的量子点背光模组第二实施例的工作过程为：背光源40’发射蓝色光进入量子点管30’，激发量子点管30’中的量子点材料31’发出红色光及绿色光，透过量子点管30’的蓝色光射入光学镀层11’，由于光学镀层11’对蓝色光的反射率高，将部分射入的蓝色光反射回量子点管30’中，重新激发量子点管30’中的量子点材料31’发出红色光与绿色光，量子点管30’中的量子点材料31’发出红色光与绿色光透过光学镀层11与部分透过光学镀层11’的蓝色光混合形成白光，经反光板20反射，并继续由导光板10导光，完成背光的提供。由于所述光学镀层11对蓝色光的反射率高，即对波长为340nm—480nm的光的反射率为40％-60％，能够对背光源40’发射的蓝色光进行反射，多次激发量子点管30’中的量子点材料31’发出红色光与绿色光，与现有技术相比，大大增加量子点管的激发效率，提高量子点背光模组的亮度及色域，提升产品品质。
综上所述，本发明的量子点背光模组，在导光板远离反光板一侧设置量子点薄膜并在量子点薄膜远离导光板一侧设置光学镀层，或在导光板与背光源之间设置量子点管并在导光板靠近量子点管的一侧设置光学镀层，在完成发出白色背光的前提下，利用光学镀层反射部分背光源发射的单色 光至量子点薄膜或量子点管重新激发其发光，增加量子点薄膜或量子点管的激发效率，提高量子点背光模组的亮度及色域，提升产品品质。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (13)

  1. 一种量子点背光模组，包括：导光板、设置于所述导光板一面的反光板、设置于所述导光板一侧的背光源、及设置于所述导光板另一面的量子点薄膜；所述量子点薄膜远离导光板的表面设有光学镀层；所述光学镀层能反射背光源发出的光线对量子点薄膜进行激发。
  2. 如权利要求1所述的量子点背光模组，其中，所述背光源为蓝光LED；所述背光源发出的蓝光激发所述量子点薄膜发出白光。
  3. 如权利要求2所述的量子点背光模组，其中，所述光学镀层能反射蓝光重新激发量子点薄膜。
  4. 如权利要求3所述的量子点背光模组，其中，所述光学镀层对波长为340nm—480nm的光的反射率为40％-60％。
  5. 如权利要求3所述的量子点背光模组，其中，所述光学镀层对波长为340nm—480nm的光的反射率为50％。
  6. 一种量子点背光模组，包括：导光板、设置于所述导光板一面的反光板、设置于所述导光板一侧的量子点管、及设置于所述量子点管远离导光板一侧的背光源；
    所述导光板在靠近量子点管的表面设有光学镀层；所述光学镀层能反射背光源发出的光线对量子点管进行激发。
  7. 如权利要求6所述的量子点背光模组，其中，所述背光源为蓝光LED；所述背光源发出的蓝光激发所述量子点管发出白光。
  8. 如权利要求7所述的量子点背光模组，其中，所述光学镀层能反射蓝光重新激发量子点管。
  9. 如权利要求7所述的量子点背光模组，其中，所述光学镀层对波长为340nm—480nm的光的反射率为40％-60％。
  10. 如权利要求7所述的量子点背光模组，其中，所述光学镀层对波长为340nm—480nm的光的反射率为50％。
  11. 一种量子点背光模组，包括：导光板、设置于所述导光板一面的反光板、设置于所述导光板一侧的背光源、及设置于所述导光板另一面的量子点薄膜；所述量子点薄膜远离导光板的表面设有光学镀层；所述光学镀层能反射背光源发出的光线对量子点薄膜进行激发；
    其中，所述背光源为蓝光LED；所述背光源发出的蓝光激发所述量子点薄膜发出白光；
    其中，所述光学镀层能反射蓝光重新激发量子点薄膜。
  12. 如权利要求11所述的量子点背光模组，其中，所述光学镀层对波长为340nm—480nm的光的反射率为40％-60％。
  13. 如权利要求11所述的量子点背光模组，其中，所述光学镀层对波长为340nm—480nm的光的反射率为50％。
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