WO2019062239A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2019062239A1
WO2019062239A1 PCT/CN2018/093741 CN2018093741W WO2019062239A1 WO 2019062239 A1 WO2019062239 A1 WO 2019062239A1 CN 2018093741 W CN2018093741 W CN 2018093741W WO 2019062239 A1 WO2019062239 A1 WO 2019062239A1
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WO
WIPO (PCT)
Prior art keywords
light
quantum dots
light source
backlight module
excitation
Prior art date
Application number
PCT/CN2018/093741
Other languages
English (en)
French (fr)
Inventor
陈细俊
邓天应
强科文
Original Assignee
深圳Tcl新技术有限公司
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Filing date
Publication date
Application filed by 深圳Tcl新技术有限公司 filed Critical 深圳Tcl新技术有限公司
Publication of WO2019062239A1 publication Critical patent/WO2019062239A1/zh

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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
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the present application relates to the field of electronic display technologies, and in particular, to a backlight module and a display device using the same.
  • the display device in the prior art often adopts a side-entry backlight module, and the LED light source is disposed on the side of the light guide plate, and the quantum dots are coated on the optical film to form a quantum dot film, and the LED is formed.
  • the colored light emitted by the light source forms a uniform surface light source through the light guide plate, and then forms a white light through the quantum dot film.
  • the thickness of the light guide plate is made as thin as possible to further reduce the thickness of the display device, and the size of the LED light source is also reduced in order to fit the light guide plate.
  • the smaller the size of the LED light source the lower the conversion efficiency of the light effect, the greater the difficulty of packaging, and the reduction of the size of the LED light source, resulting in poor reliability of the LED light source and unstable performance of the display device.
  • the main purpose of the present application is to provide a backlight module and a display device, which are intended to solve the technical problem of unstable product performance caused by the use of a thin light guide plate in the existing backlight module.
  • the display module of the present application includes an excitation light source and a light guiding component, the excitation light source is disposed at a side of the light guiding component, the light guiding component includes a light guiding plate, and is disposed on the excitation light source. And a light collecting rod disposed between the light guide plate, the light collecting rod is disposed to converge the light emitted by the excitation light source and refracted into the light guide plate, wherein the light collecting rod is disposed to be disposed by the excitation light source The emitted light excites quantum dots that form white light.
  • the light guide plate includes a light incident surface facing the excitation light source, and the light collecting rod is a convex lens facing the excitation light source, and a focus of the convex lens falls on the light incident surface.
  • the light exiting side of the convex lens is a convex surface
  • the light incident side of the convex lens is a convex surface, a concave surface or a plane
  • the light exiting side of the convex lens is a flat surface
  • the light incident side of the convex lens is a convex surface
  • the light guide plate has a thickness of less than 2 mm.
  • the excitation light source is a plurality of LED lamp beads arranged at intervals, the LED lamp bead comprises an LED chip, and the LED chip has a length and a width greater than a thickness of the light guide plate.
  • the quantum dot comprises one or more of a red quantum dot, a green quantum dot, and a blue quantum dot.
  • the quantum dots are inorganic perovskite quantum dots, and the inorganic perovskite quantum dot chemical formula is CsPbX 3 , wherein X is Cl, Br or I.
  • the quantum dot is any one of a first compound formed from an element in Group II and Group IV or a second compound formed from an element in Group III and Group V. Made of materials;
  • the quantum dots are made of a core-shell structure compound or a doped nanocrystalline material formed by coating at least one of the first compound and at least one of the second compounds;
  • the quantum dots are made of a plurality of the first compounds or a core-shell structure compound or a doped nanocrystalline material formed by coating a plurality of the second compounds.
  • the concentrating rod is injection molded by uniformly mixing the optical plastic having a light transmittance of more than 90% and the quantum dots.
  • the present application further provides a display device including a housing, a liquid crystal panel, and a backlight module as described above, the liquid crystal panel and the backlight module being housed in the housing. .
  • the light emitted by the excitation light source can pass through the convergence of the light collecting rod and then enter the light guiding plate to concentrate the light emitted by the excitation light source to Increasing the coupling efficiency of the excitation light source and the light guide plate; when the size of the excitation light source used is larger than the thickness of the light guide plate, the light emitted by the excitation light source may also enter the light guide plate to avoid The problem of poor light leakage; by providing the light collecting rod, the technical problem of poor product performance caused by using the excitation light source of a smaller size can be avoided; compared with the quantum film of the prior art, The quantum dots are disposed in the light collecting rod such that the quantum dots are close to the excitation light source, which is beneficial to improving the quantum dot excitation efficiency.
  • a quantum dot backlight module design with high excitation efficiency, ultra-thin, and ultra-high quality display is realized.
  • FIG. 1 is a partial cross-sectional structural view of an embodiment of a display device of the present application
  • FIG. 2 is a schematic diagram of an optical principle of an embodiment of a light collecting rod of the present application applied to a backlight module;
  • FIG. 3 is a schematic diagram of an optical principle of a second embodiment of a light collecting rod of the present application applied to a backlight module;
  • FIG. 4 is a schematic view showing the optical principle of the third embodiment of the light collecting rod of the present application applied to a backlight module;
  • FIG. 5 is a schematic diagram showing the optical principle of the fourth embodiment of the light collecting rod of the present application applied to a backlight module.
  • first”, “second”, and the like in this application are used for descriptive purposes only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” and “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • fixed may be a fixed connection, or may be a detachable connection, or may be integrated; It may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship of two elements unless explicitly defined otherwise.
  • fix may be a fixed connection, or may be a detachable connection, or may be integrated; It may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship of two elements unless explicitly defined otherwise.
  • specific meanings of the above terms in the present application can be understood on a case-by-case basis.
  • the "size" of the excitation light source in the "small-sized excitation light source” and the “large-size excitation light source” of the present application is relative to the thickness of the light guide plate unless otherwise specifically defined and defined.
  • the present application proposes a backlight module 10.
  • FIG. 1 is a partial cross-sectional structural view of an embodiment of a display device of the present application.
  • the backlight module 10 includes an excitation light source 1 and a light guiding component 3.
  • the excitation light source 1 is disposed at a side of the light guiding component 3, and the light guiding component 3 includes a light guiding plate 31 and is disposed on the excitation light source 1 and A light collecting rod 33 between the light guide plates 31, the light collecting rod 33 is arranged to converge the light emitted by the excitation light source 1 and refracted into the light guide plate 31.
  • the light collecting rod 33 is arranged to be excited by the light emitted by the excitation light source 1 to form white light. Quantum dots (not shown).
  • the light emitted from the excitation light source 1 can be collected by the light collecting rods 33 and then enter the light guide plate 31 to concentrate the light emitted from the excitation light source 1 to improve the coupling efficiency between the excitation light source 1 and the light guide plate 31.
  • the size of the excitation light source 1 is larger than the thickness of the light guide plate 31, the light emitted from the excitation light source 1 may also enter the light guide plate 31 to avoid the problem of poor light leakage; by providing the light collecting rod 33, it is possible to avoid A technical problem of poor product performance caused by a small-sized excitation light source; compared with the prior art quantum film, by placing quantum dots in the light collecting rod 33, the quantum dots are close to the excitation light source 1, It is beneficial to improve the quantum dot excitation efficiency.
  • the light guide plate 31 includes a light incident surface 311 facing the excitation light source 1, and the light collecting rod 33 is a light collecting rod 33 facing the excitation light source 1, and the focus of the light collecting rod 33 is in.
  • the light guide plate 31 is configured to diffuse the point light source or the line light source emitted by the excitation light source 1 to form a surface light source, and the distance between the excitation light source 1 and the light collecting rod 33 is small, and the light emitted by the excitation light source 1 can be regarded as parallel light.
  • the focus of the light collecting rod 33 When the focus of the light collecting rod 33 is on the light incident surface 1, the parallel light emitted from the excitation light source 1 converges at the focus, that is, converges on the light incident surface 311, thereby improving the coupling efficiency.
  • the focus of the light collecting rod 33 is on the central axis of the light incident surface 311 to improve the light intensity distribution of the surface light source emitted by the light guide plate 31 after diffusion.
  • the light guide plate 31 includes a light-emitting surface 313 and a reflection surface 315 disposed opposite to each other.
  • the light guide assembly 3 further includes a reflection sheet 35 disposed opposite to the reflection surface 315 and an optical film 37 disposed opposite to the light-emitting surface 313.
  • the light emitted from the reflecting surface 315 can be reflected by the reflecting sheet 35 into the light guide plate 31, thereby increasing the uniformity of light emitted by the backlight module 10.
  • the optical film 37 may include a brightness enhancement film, a light diffusing film, and the like, which can be selected by those skilled in the art as needed.
  • the light exiting side of the convex lens may be a convex surface, and the light incident side of the convex lens may be a convex surface, a concave surface or a plane; or the light exiting side of the convex lens may be a flat surface, and the light incident side of the convex lens may be a convex surface.
  • the concentrating bar 33 may specifically be a convex-convex lens, a plano-convex lens, a convex flat lens, a meniscus lens, or the like. Among them, a condenser lens having a structure of the concentrating bar 33 can be selected as needed by those skilled in the art. Embodiments of concentrating bars 33 having different configurations are provided below for reference.
  • the light collecting rod 33 is a convex convex lens, and both the light emitting side and the light incident side are convex.
  • the light collecting rod 33 includes a first side surface 331a that is convex toward the excitation light source 1 and a second side surface 333a that is convex toward the light incident surface 311.
  • the distance between the excitation light source 1 and the first side surface 331a is L, and the light emitted from the excitation light source 1 is refracted twice by the first side surface 331a and the second side surface 333a, and is concentrated and then enters the light guide plate 31.
  • the distance between the light collecting rod 33 and the light guide plate 31 is adjusted to be F1.
  • the second embodiment is different from the first embodiment in that the light collecting rod 33b is a convex flat lens having a convex side on the light incident side and a flat surface on the light exiting side.
  • the light collecting rod 33b includes a first side surface 331b that protrudes toward the excitation light source 1 and a second side surface 333b that faces the light incident surface 311, and the second side surface 333b is a flat surface.
  • the distance between the excitation light source 1 and the first side surface 331b is L, and the light emitted from the excitation light source 1 is once refracted through the first side surface 331b, and is concentrated and then enters the light guide plate 31.
  • the distance between the light collecting rod 33 and the light guide plate 31 is adjusted to be F2.
  • the third embodiment is different from the first embodiment in that the light collecting rod 33c is a plano-convex lens having a plane on the light incident side and a convex side on the light exiting side.
  • the light collecting rod 33c includes a first side surface 331c facing the excitation light source 1 and a second side surface 333c protruding toward the light incident surface 311, and the first side surface 331c is a flat surface.
  • the distance between the excitation light source 1 and the first side surface 331c is L, and the light emitted from the excitation light source 1 is once refracted through the second side surface 333c, and is concentrated and then enters the light guide plate 31.
  • the distance between the light collecting rod 33 and the light guide plate 31 is adjusted to be F3.
  • the fourth embodiment is different from the first embodiment in that the light collecting rod 33d is a meniscus lens having a concave side on the light incident side and a convex side on the light exiting side.
  • the light collecting rod 33d includes a first side surface 331d and a second side surface 333d which are oppositely disposed, and the first side surface 331d and the second side surface 333d are convex toward the light incident surface 311.
  • the distance between the excitation light source 1 and the first side surface 331d is L, and the light emitted by the excitation light source 1 is twice refracted through the first side surface 331d and the second side surface 333d, and is concentrated and then enters the light guide plate 31, wherein scattering occurs through the first side surface 331d. .
  • the distance between the light collecting rod 33d and the light guide plate 31 is adjusted to be F4.
  • the distance L between the excitation light source 1 and the first side surface is the same, and the light collecting rods 33 of different structures are used, so that the focus concentrated by the light collecting rods 33 falls on the light incident surface 311, and the light guide plate 31 and the light collecting layer The distance between the bars 33 is different. Therefore, those skilled in the art can select different structures of the light collecting rods 33 according to actual conditions to satisfy the positional relationship between the light guide plate 31 and the light collecting rods 33.
  • the light collecting rod 33 is a convex and convex lens to minimize the space position required by the light collecting rod 33 and the light guide plate 31, which is advantageous for the thin design of the display module.
  • the thickness of the light guide plate 31 is less than 2 mm.
  • the excitation light source 1 is a plurality of LED lamp beads (not shown) arranged at intervals, and the LED lamp beads comprise LED chips, and the length and width of the LED chips are both greater than the thickness of the light guide plate 31.
  • the excitation light source 1 is a light bar formed by a plurality of LED lamp beads, and the LED lamp bead further includes an encapsulant coated on the LED chip, and the LED chip has a size of 70 mm ⁇ 20 mm.
  • the light guide plate 31 can meet the thin design, and a larger size LED chip can be used, thereby avoiding the display module having a smaller LED bead size and packaging. Poor technical problems that cause poor performance.
  • the backlight module 10 further includes a first support block (not labeled) and a second support block (not labeled) disposed to fix the light collecting rod 33.
  • the first support block and the second support block are respectively located on the excitation light source 1
  • opposite sides of the light collecting rod 33 are fixedly connected to the first supporting block and the second supporting block, respectively.
  • the quantum dots comprise one or more of red quantum dots, green quantum dots, and blue quantum dots.
  • a person skilled in the art can select different excitation light sources 1 to emit light of different wavelengths according to different quantum dots, so that the light emitted by the excitation light source 1 and the light excited by the light emitted by the excitation light source 1 are mixed to obtain white light.
  • the equivalent sub-point is a green quantum dot
  • an excitation light source 1 emitting wavelengths of 620 nm to 760 nm and 430 nm to 450 nm may be used; when the equivalent sub-point is a red quantum dot, the emission wavelength may be 620 nm.
  • the quantum dots are inorganic perovskite quantum dots, and the chemical formula of the inorganic perovskite quantum dots is CsPbX 3 , wherein X is Cl, Br or I.
  • the inorganic perovskite quantum dots have high fluorescence quantum efficiency, adjustable fluorescence wavelength, and cover the entire visible light wave with narrow line width.
  • the quantum dot is any one of a first compound formed from an element of Group II and Group IV or a second compound formed from an element of Group III and Group V. Made of a material; or, the quantum dot is made of a core-shell structure compound or a doped nanocrystalline material formed by coating at least one of the first compound and at least one of the second compound; or, the quantum dot is A plurality of or a plurality of the second compound in a compound are coated with a core-shell structure compound or a doped nanocrystalline material.
  • the first compound may specifically be CdSe, CdTe, MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe, and CdS
  • the second compound may specifically be GaN, GaP, GaAs, InN, InP, and InAs.
  • the light collecting rod 33 is uniformly injection-molded by optical plastics and quantum dots having a light transmittance of more than 90%, thereby reducing the amount of quantum dots used.
  • the optical plastic may be one or more of PMMA, MS, PC, PS, and the like.
  • the concentrating rod is uniformly injection-molded by an optical plastic having a light transmittance of more than 90% and the quantum dots in a certain ratio, and then injection-molded.
  • the present application further provides a display device including a housing 20, a liquid crystal panel 40, and a backlight module 10 as described above.
  • the liquid crystal panel 40 and the backlight module 10 are housed in the housing 20.
  • the housing 20 includes a surface housing 21, a rear housing 22, a back plate 23, a heat sink 24, and a plastic frame 25.
  • the rear housing 20 is connected to the surface housing 21 to form a cavity, and the liquid crystal panel 40 is clamped to the plastic frame 25.
  • the heat sink 24 includes a bottom wall 243 disposed along the back plate 23 and a side wall 241 extending from the bottom wall 243 toward the liquid crystal panel 40, the bottom wall
  • the escape groove 245 for escaping the excitation light source 1 is provided on the 243 such that the excitation light source 1, the light collecting rod 33, and the light guide plate 31 share the same central axis.
  • the excitation light source 1 is disposed on the side wall 241, and the reflection sheet 35 is laid on the bottom wall 243.
  • the light emitted from the excitation light source 1 enters the light collecting rod 33, and the quantum dots in the light collecting rod 33 are excited to obtain white light of a high color gamut, and at the same time, the light emitted from the excitation light source 1 is concentrated by the convergence of the light collecting rod 33. In the light panel 31.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种背光模组及显示装置，其中，背光模组（10）包括激发光源（1）和导光组件（3），激发光源（1）设于导光组件（3）的侧边，导光组件（3）包括导光板（31）和设于激发光源（1）和导光板（31）之间的聚光棒（33），聚光棒（33）设置为汇聚激发光源（1）发出的光并折射进入导光板（31），聚光棒（33）内设有设置为受激发光源（1）发出的光激发形成白光的量子点。通过设置聚光棒（33）和量子点，背光模组（10）提高了光利用效率和光激发效率，从而实现高激发效率、超薄、超高画质显示。

Description

背光模组及显示装置
技术领域
本申请涉及电子显示技术领域，具体涉及一种背光模组和应用该背光模组的显示装置。
背景技术
为满足薄型化设计，现有技术中的显示装置常采用侧入式背光模组，将LED光源设置于导光板的侧边，在光学膜片上涂布量子点，形成量子点膜片，LED光源发出的有色光通过导光板形成均匀的面光源，再通过量子点膜片形成白光。
在现有技术中，将导光板的厚度尽可能的薄化，以进一步减小显示装置的厚度，为了配合导光板，LED光源的尺寸也一并减小。LED光源的尺寸越小光效转换率越低，封装难度越大，减小LED光源的尺寸，从而导致LED光源可靠性不佳、显示装置的性能不稳定。
因此，有必要提供一种新型的背光模组和显示装置，以解决上述技术问题。
申请内容
本申请的主要目的是提供一种背光模组及显示装置，旨在解决现有背光模组采用较薄的导光板所导致的产品性能不稳定的技术问题。
为实现上述目的，本申请提出的显示模组包括激发光源和导光组件，所述激发光源设于所述导光组件的侧边，所述导光组件包括导光板和设于所述激发光源和所述导光板之间的聚光棒，所述聚光棒设置为汇聚所述激发光源发出的光并折射进入所述导光板，所述聚光棒内设有设置为受所述激发光源发出的光激发形成白光的量子点。
可选地，所述导光板包括正对所述激发光源的入光面，所述聚光棒为正对所述激发光源的凸透镜，所述凸透镜的焦点落在所述入光面上。
可选地，所述凸透镜的出光侧为凸面，且所述凸透镜的入光侧为凸面、凹面或者平面；
或者，所述凸透镜的出光侧为平面，且所述凸透镜的入光侧为凸面。
可选地，所述导光板的厚度小于2mm。
可选地，所述激发光源为多个间隔排列设置的LED灯珠，所述LED灯珠包括LED芯片，所述LED芯片的长度和宽度均大于所述导光板的厚度。
可选地，所述量子点包括红色量子点、绿色量子点和蓝色量子点中的一种或多种。
可选地，所述量子点为无机钙钛矿量子点，所述无机钙钛矿量子点化学式为CsPbX3，式中X为Cl、Br或I。
可选地，所述量子点由第II族和第IV族中的元素形成的第一化合物中的任意一种或第III族和第V族中的元素形成的第二化合物中的任意一种材料制成；
或者，所述量子点由所述第一化合物中的至少一种与所述第二化合物中的至少一种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成；
或者，所述量子点由所述第一化合物中的多种或所述第二化合物中的多种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成。
可选地，所述聚光棒由透光率大于90%的光学塑料和所述量子点均匀混合后注塑成型。
本申请还提供一种显示装置，所述显示装置包括壳体、液晶面板和如前述的背光模组，所述液晶面板和所述背光模组收容于所述壳体内。。
本申请技术方案中，通过设置所述聚光棒，使得所述激发光源发出的光可通过所述聚光棒的汇聚后再进入所述导光板，将所述激发光源发出的光集中，以提高所述激发光源与所述导光板的耦合效率；当采用的所述激发光源的尺寸比所述导光板的厚度大时，所述激发光源发出的光也可以全部进入所述导光板，避免漏光不良的问题；通过设置所述聚光棒，可避免因使用较小尺寸的所述激发光源所导致的产品性能不佳的技术问题；相较于现有技术中的量子膜，通过将所述量子点设于所述聚光棒中，使得所述量子点与所述激发光源的距离近，有利于提高所述量子点激发效率。从而实现高激发效率、超薄、超高画质显示的量子点背光模组设计。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本申请显示装置一实施例的部分剖面结构示意图；
图2为本申请聚光棒一实施例应用于背光模组中的光学原理示意图；
图3为本申请聚光棒第二实施例应用于背光模组中的光学原理示意图；
图4为本申请聚光棒第三实施例应用于背光模组中的光学原理示意图；
图5为本申请聚光棒第四实施例应用于背光模组中的光学原理示意图。
第一实施例的附图标号说明：
标号 名称 标号 名称
10 背光模组 1 激发光源
3 导光组件 31 导光板
311 入光面 313 出光面
315 反射面 35 反射片
37 光学膜片 33 聚光棒
331a 第一侧面 333a 第二侧面
20 壳体 21 面壳
22 后壳 23 背板
24 散热器 241 侧壁
243 底壁 25 胶框
40 液晶面板
第二实施例的附图说明：
33b 凸透镜 331b 第一侧面
333b 第二侧面
第三实施例的附图说明：
33c 凸透镜 331c 第一侧面
333c 第二侧面
第四实施例的附图说明：
33d 凸透镜 331d 第一侧面
333d 第二侧面
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本申请实施例中的附图，对本申请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申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明，本申请实施例中所有方向性指示（诸如上、下、左、右、前、后……）仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本申请中如涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本申请中，除非另有明确的规定和限定，术语“连接”、“固定”等应做广义理解，例如，“固定”可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
另外，本申请各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
在本申请中，除非另有明确的规定和限定，本申请的“小尺寸的激发光源”和“大尺寸的激发光源”中激发光源的“尺寸”均是相对于导光板的厚度而言。
本申请提出一种背光模组10。
请参照图1，为本申请显示装置一实施例的部分剖面结构示意图。
在本申请一实施例中，背光模组10包括激发光源1和导光组件3，激发光源1设于导光组件3的侧边，导光组件3包括导光板31和设于激发光源1和导光板31之间的聚光棒33，聚光棒33设置为汇聚激发光源1发出的光并折射进入导光板31，聚光棒33内设有设置为受激发光源1发出的光激发形成白光的量子点（未图示）。
通过设置聚光棒33，使得激发光源1发出的光可通过聚光棒33的汇聚后再进入导光板31，将激发光源1发出的光集中，以提高激发光源1与导光板31的耦合效率；当采用的激发光源1的尺寸比导光板31的厚度大时，激发光源1发出的光也可以全部进入导光板31，避免漏光不良的问题；通过设置聚光棒33，可避免因使用较小尺寸的激发光源所导致的产品性能不佳的技术问题；相较于现有技术中的量子膜，通过将量子点设于聚光棒33中，使得量子点与激发光源1的距离近，有利于提高量子点激发效率。
请参阅图2，在一实施例中，导光板31包括正对激发光源1的入光面311，聚光棒33为正对激发光源1的聚光棒33，聚光棒33的焦点在入光面311上。具体地，导光板31用于将激发光源1发出的点光源或线光源扩散形成面光源，激发光源1与聚光棒33的距离较小，可将激发光源1发出的光看成平行光，当聚光棒33的焦点在入光面1上，激发光源1发出的平行光汇聚于焦点，即汇聚于入光面311上，从而提高耦合效率。可选地，聚光棒33的焦点在入光面311的中轴线上，以提高经导光板31扩散后发出的面光源光强度分布更均匀。
具体地，导光板31包括相对设置的出光面313和反射面315，导光组件3还包括正对反射面315设置的反射片35和正对出光面313设置的光学膜片37。通过反射片35能将从反射面315射出的光反射进入导光板31，增加背光模组10发出光的均匀性。光学膜片37可包括增光膜和散光膜等，本领域技术人员可根据需要进行选择。
进一步地，凸透镜的出光侧可为凸面，且凸透镜的入光侧为凸面、凹面或者平面；或者，凸透镜的出光侧可为平面，且凸透镜的入光侧为凸面。即，聚光棒33具体可以为凸凸透镜、平凸透镜、凸平透镜或凹凸透镜等，其中，聚光棒33为何种结构的凸透镜，本领域技术人员可以根据需要进行选择。以下提供具有不同结构的聚光棒33的实施例，以供参考。
请参阅图2，在第一实施例中，聚光棒33为凸凸透镜，其出光侧和入光侧均为凸面。具体地，聚光棒33包括向激发光源1凸起的第一侧面331a和向入光面311凸起的第二侧面333a。激发光源1与第一侧面331a的距离为L，激发光源1发出的光经过第一侧面331a和第二侧面333a发生两次折射，汇聚后进入导光板31。为使聚光棒33的焦点落在入光面311上，调整聚光棒33与导光板31的距离为F1。
请参阅图3，第二实施例与第一实施例不同之处在于聚光棒33b为凸平透镜，其入光侧为凸面，出光侧为平面。具体地，聚光棒33b包括向激发光源1凸起的第一侧面331b和朝向入光面311的第二侧面333b，第二侧面333b为平面。激发光源1与第一侧面331b的距离为L，激发光源1发出的光经过第一侧面331b发生一次折射，汇聚后进入导光板31。为使聚光棒33的焦点落在入光面311上，调整聚光棒33与导光板31的距离为F2。
请参阅图4，第三实施例与第一实施例不同之处在于聚光棒33c为平凸透镜，其入光侧为平面，出光侧为凸面。具体地，聚光棒33c包括朝向激发光源1的第一侧面331c和向入光面311凸起的第二侧面333c，第一侧面331c为平面。激发光源1与第一侧面331c的距离为L，激发光源1发出的光经过第二侧面333c发生一次折射，汇聚后进入导光板31。为使聚光棒33的焦点落在入光面311上，调整聚光棒33与导光板31的距离为F3。
请参阅图5，第四实施例与第一实施例不同之处在于聚光棒33d为凹凸透镜，其入光侧为凹面，出光侧为凸面。具体地，聚光棒33d包括相对设置的第一侧面331d和第二侧面333d，第一侧面331d和第二侧面333d向入光面311凸起。激发光源1与第一侧面331d距离为L，激发光源1发出的光经过第一侧面331d和第二侧面333d发生两次折射，汇聚后进入导光板31，其中，经过第一侧面331d发生散射作用。为使聚光棒33的焦点落在入光面311上，调整聚光棒33d与导光板31的距离为F4。
以上各个实施例中，激发光源1到第一侧面的距离L相同，采用不同结构的聚光棒33，为使得聚光棒33汇聚的焦点落在入光面311上，导光板31和聚光棒33之间的距离不同。所以，本领域技术人员可根据实际情况，选择不同的聚光棒33结构，以满足导光板31和聚光棒33之间的位置关系。优选的，聚光棒33为凸凸透镜，以使聚光棒33和导光板31所需的空间位置最小，有利于显示模组薄型化设计。
请再次参阅图1和图2，在一实施例中，导光板31的厚度小于2mm。以满足薄型化设计。进一步地，激发光源1为多个间隔排列设置的LED灯珠（未图示），LED灯珠包括LED芯片，LED芯片的长度和宽度均大于导光板31的厚度。在本实施例中，激发光源1为多个LED灯珠形成的灯条，LED灯珠还包括包覆于LED芯片上的封装胶，LED芯片尺寸为70mm×20mm。通过设置LED芯片的长度和宽度均大于导光板31的厚度，使得导光板31满足薄型化设计的同时，可采用较大尺寸的LED芯片，从而避免显示模组因LED灯珠尺寸较小、封装不良导致性能不佳的技术问题。
具体地，背光模组10还包括设置为固定聚光棒33的的第一支撑块（未标示）与第二支撑块（未标示），第一支撑块与第二支撑块分别位于激发光源1两侧，聚光棒33的相对两侧分别与第一支撑块与第二支撑块固定连接。
在一实施例中，量子点包括红色量子点、绿色量子点和蓝色量子点中的一种或多种。本领域技术人员可根据量子点的不同，选择不同的激发光源1发出不同波长的光，以使激发光源1发出的光和量子点受激发光源1发出的光激发得到的光混合获到白光。具体地，当量子点为绿色量子点时，可采用发出波长为620纳米~760纳米和430纳米~450纳米的激发光源1；当量子点为红色量子点时，可采用发出波长为620纳米~760纳米和490纳米~580纳米的激发光源1；当量子点为红色量子点和绿色量子点时，可采用发出波长为430纳米~455纳米的激发光源1；当量子点为红色量子点、绿色量子点和蓝色量子点时，可采用发出波长为380纳米~430纳米的激发光源1。采用能发出不同波长的激发光源1，从而增加显示模组10的色域。
在一实施例中，量子点为无机钙钛矿量子点，无机钙钛矿量子点的化学式为CsPbX3，式中X为Cl、Br或I。无机钙钛矿量子点的荧光量子效率高、荧光波长可调，且覆盖整个可见光波、线宽窄。
在另一实施例中，量子点由第II族和第IV族中的元素形成的第一化合物中的任意一种或第III族和第V族中的元素形成的第二化合物中的任意一种材料制成；或者，量子点由第一化合物中的至少一种与第二化合物中的至少一种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成；或者，量子点由第一化合物中的多种或第二化合物中的多种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成。第一化合物具体可以是CdSe、CdTe、MgS、MgSe、MgTe、CaS、CaSe、CaTe、SrS、SrSe、SrTe、BaS、BaSe、BaTe、ZnS、ZnSe、ZnTe和CdS，第二化合物具体可以是GaN、GaP、GaAs、InN、InP和InAs。
进一步地，聚光棒33由透光率大于90%的光学塑料和量子点均匀混合后注塑成型，从而减小量子点的使用量。具体地，光学塑料可以是PMMA、MS、PC、PS等材料中的一种或多种。所述聚光棒由透光率大于90%的光学塑料和所述量子点按照一定的比例均匀混合后注塑成型。
本申请还提供一种显示装置，包括壳体20、液晶面板40和如前述的背光模组10，液晶面板40和背光模组10收容于所述壳体20内。
具体地，壳体20包括面壳21、后壳22、背板23、散热器24和胶框25，后壳20与面壳21相连接并形成容腔，液晶面板40夹持于胶框25和面壳21之间，背板23和散热器24设于容腔内，散热器24包括沿背板23设置的底壁243和自底壁243向液晶面板40延伸的侧壁241，底壁243上设有避让激发光源1的避让槽245，以使激发光源1、聚光棒33和导光板31的共用同一中心轴。激发光源1设于侧壁241上，反射片35铺设于底壁243上。
激发光源1发出的光进入聚光棒33，激发聚光棒33中的量子点获得高色域的白光，同时通过聚光棒33的汇聚作用，从激发光源1发出的光汇聚后射入导光板31中。
以上所述仅为本申请的优选实施例，并非因此限制本申请的专利范围，凡是在本申请的构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。

Claims (19)

  1. 一种背光模组，所述背光模组包括激发光源和导光组件，所述激发光源设于所述导光组件的侧边，其中，所述导光组件包括导光板和设于所述激发光源和所述导光板之间的聚光棒，所述聚光棒设置为汇聚所述激发光源发出的光并折射进入所述导光板，所述聚光棒内设有设置为受所述激发光源发出的光激发形成白光的量子点。
  2. 如权利要求1所述的背光模组，其中，所述导光板包括正对所述激发光源的入光面，所述聚光棒为正对所述激发光源的凸透镜，所述凸透镜的焦点落在所述入光面上。
  3. 如权利要求2所述的背光模组，其中，所述凸透镜的出光侧为凸面，且所述凸透镜的入光侧为凸面、凹面或者平面；
    或者，所述凸透镜的出光侧为平面，且所述凸透镜的入光侧为凸面。
  4. 如权利要求2所述的背光模组，其中，所述量子点包括红色量子点、绿色量子点和蓝色量子点中的一种或多种。
  5. 如权利要求2所述的背光模组，其中，所述量子点为无机钙钛矿量子点，所述无机钙钛矿量子点化学式为CsPbX3，式中X为Cl、Br或I。
  6. 如权利要求2所述的背光模组，其中，所述量子点由第II族和第IV族中的元素形成的第一化合物中的任意一种或第III族和第V族中的元素形成的第二化合物中的任意一种材料制成；
    或者，所述量子点由所述第一化合物中的至少一种与所述第二化合物中的至少一种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成；
    或者，所述量子点由所述第一化合物中的多种或所述第二化合物中的多种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成。
  7. 如权利要求1所述的背光模组，其中，所述导光板的厚度小于2mm。
  8. 如权利要求7所述的背光模组，其中，所述激发光源为多个间隔排列设置的LED灯珠，所述LED灯珠包括LED芯片，所述LED芯片的长度和宽度均大于所述导光板的厚度。
  9. 如权利要求1所述的背光模组，其中，所述量子点包括红色量子点、绿色量子点和蓝色量子点中的一种或多种。
  10. 如权利要求1所述的背光模组，其中，所述量子点为无机钙钛矿量子点，所述无机钙钛矿量子点化学式为CsPbX3，式中X为Cl、Br或I。
  11. 如权利要求1所述的背光模组，其中，所述量子点由第II族和第IV族中的元素形成的第一化合物中的任意一种或第III族和第V族中的元素形成的第二化合物中的任意一种材料制成；
    或者，所述量子点由所述第一化合物中的至少一种与所述第二化合物中的至少一种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成；
    或者，所述量子点由所述第一化合物中的多种或所述第二化合物中的多种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成。
  12. 如权利要求1所述的背光模组，其中，所述聚光棒由透光率大于90%的光学塑料和所述量子点均匀混合后注塑成型。
  13. 一种显示装置，其中，所述显示装置包括壳体、液晶面板和背光模组，所述液晶面板和所述背光模组收容于所述壳体内，所述背光模组包括激发光源和导光组件，所述激发光源设于所述导光组件的侧边，所述导光组件包括导光板和设于所述激发光源和所述导光板之间的聚光棒，所述聚光棒设置为汇聚所述激发光源发出的光并折射进入所述导光板，所述聚光棒内设有设置为受所述激发光源发出的光激发形成白光的量子点。
  14. 如权利要求13所述的显示装置，其中，所述导光板包括正对所述激发光源的入光面，所述聚光棒为正对所述激发光源的凸透镜，所述凸透镜的焦点落在所述入光面上。
  15. 如权利要求14所述的显示装置，其中，所述凸透镜的出光侧为凸面，且所述凸透镜的入光侧为凸面、凹面或者平面；
    或者，所述凸透镜的出光侧为平面，且所述凸透镜的入光侧为凸面。
  16. 如权利要求13所述的显示装置，其中，所述导光板的厚度小于2mm。
  17. 如权利要求13所述的显示装置，其中，所述量子点包括红色量子点、绿色量子点和蓝色量子点中的一种或多种。
  18. 如权利要求13所述的显示装置，其中，所述量子点为无机钙钛矿量子点，所述无机钙钛矿量子点化学式为CsPbX3，式中X为Cl、Br或I。
  19. 如权利要求13所述的显示装置，其中，所述量子点由第II族和第IV族中的元素形成的第一化合物中的任意一种或第III族和第V族中的元素形成的第二化合物中的任意一种材料制成；
    或者，所述量子点由所述第一化合物中的至少一种与所述第二化合物中的至少一种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成；
    或者，所述量子点由所述第一化合物中的多种或所述第二化合物中的多种包覆形成的核壳结构化合物或者掺杂纳米晶材料制成。
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