WO2020107786A1 - 背光模组及具有该背光模组的显示装置 - Google Patents

背光模组及具有该背光模组的显示装置 Download PDF

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Publication number
WO2020107786A1
WO2020107786A1 PCT/CN2019/083987 CN2019083987W WO2020107786A1 WO 2020107786 A1 WO2020107786 A1 WO 2020107786A1 CN 2019083987 W CN2019083987 W CN 2019083987W WO 2020107786 A1 WO2020107786 A1 WO 2020107786A1
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Prior art keywords
backlight module
layer
light
module according
fluorescent film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/083987
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English (en)
French (fr)
Inventor
杨勇
查国伟
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US16/603,677 priority Critical patent/US20210333634A1/en
Publication of WO2020107786A1 publication Critical patent/WO2020107786A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • 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
    • G02B6/0013—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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4256—Details of housings
    • G02B6/4257—Details of housings having a supporting carrier or a mounting substrate or a mounting plate
    • G02B6/4259—Details of housings having a supporting carrier or a mounting substrate or a mounting plate of the transparent type
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133612—Electrical details
    • 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 invention relates to the field of displays, in particular to a backlight module and a display device having the backlight module.
  • Mini-LED also known as "sub-millimeter light-emitting diode" means an LED with a grain size of about 100 microns.
  • Mini-LED has been widely concerned by many manufacturers because of its advantages such as high brightness, flexibility, low power consumption, light and thin, and the ability to make narrow frame samples.
  • FIG. 2 is a cross-sectional view of the backlight module adopting the light mixing method of FIG.
  • the backlight column 91 shown in FIG. 1 cannot be added to the backlight module 9
  • the structure results in a hollow gap between the surface light source 94 and the diffuser 90.
  • the diffuser 90 causes the diaphragm to loosen or fall off, causing the hollow gap to change, resulting in uneven light mixing of the miniLED. Therefore, for a light mixing method that uses a single diffusion sheet 90 and reserves a certain light mixing distance, in the process of assembling the backlight module 9, due to the limitation of the frame glue 8, mass production cannot be achieved, and there is also a large reliability Risk, and the light mixing method using multiple diffusion membranes will reduce the light efficiency of Mini-LED. How to realize the feasibility of the Mini-LED backlight module on the premise of ensuring the light effect and the light mixing effect has become a problem that needs to be solved in the Mini-LED application process.
  • the present invention provides a backlight module and a display device having the backlight module.
  • the transparent glue film layer is used to increase the light mixing distance to replace the cushion pillar and the air layer, so that the diffusion sheet is
  • the backlight module has a support, and on the premise of ensuring a high light efficiency, the number of layers of the diffusion sheet in the backlight module is reduced to achieve the purpose of uniformly mixing light and thinning the backlight module.
  • the technical solution to the above problem is to provide a backlight module including a surface light source with a light-emitting surface; a fluorescent film covering the light-emitting surface of the surface light source; and a supporting layer provided on the fluorescent film,
  • the support layer is a transparent adhesive film layer; a diffusion sheet covers the support layer.
  • the thickness of the transparent adhesive film layer is d
  • d d1(n22-n12sin2 ⁇ )0.5/(n02-n12sin2 ⁇ )0.5;
  • d1 is the thickness required when the support layer is an air layer
  • n0 is the refractive index of the air layer
  • n1 is the refractive index of the fluorescent film
  • n2 is the refractive index of the transparent adhesive film layer
  • ⁇ is The angle of incidence of light rays entering the support layer from the fluorescent film.
  • the refractive index of the fluorescent film is 1.1-1.4.
  • the surface light source includes a substrate, wherein a surface has a plurality of metal traces; and a plurality of chips are provided on the substrate and correspondingly connected to the metal traces.
  • the surface light source further includes a reflective layer, and the reflective layer overlies one of the surfaces of the substrate with metal traces.
  • the reflective material used for the reflective layer is one of phenolic resin, epoxy resin, polyimide resin, polyester resin, and white oil.
  • the chip is a blue light chip; the size of the chip is 100 ⁇ m-500 ⁇ m.
  • the number of layers of the diffusion sheet is one layer.
  • the backlight module further includes a prism sheet, which is disposed on the diffusion sheet.
  • the invention also provides a display device having the backlight module and an encapsulation frame, the encapsulation frame covering the side of the backlight module.
  • the beneficial effects of the present invention are: the backlight module of the present invention and the display device with the backlight module increase the light mixing distance through the transparent adhesive film layer to replace the cushion column and the air layer, so that the diffusion sheet is in the backlight Supported in the group, on the premise of ensuring high light efficiency, reducing the number of layers of the diffuser in the backlight module, increasing the light transmittance, thus achieving a better light mixing effect and efficient light extraction effect
  • FIG. 1 is a cross-sectional view of a backlight module in the prior art.
  • FIG. 2 is a cross-sectional view of the packaged backlight module in FIG. 1.
  • FIG 3 is a cross-sectional view of a backlight module according to an embodiment of the invention.
  • FIG. 4 is a cross-sectional view of a surface light source according to an embodiment of the invention.
  • FIG. 5 is a distribution structure diagram of metal traces and pads of a substrate according to an embodiment of the present invention.
  • FIG. 6 is a light path diagram of light rays refracted in the air layer in the prior art.
  • FIG. 7 is an optical path diagram of light rays refracted in the transparent adhesive film layer according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, which mainly embodies the structure of the packaged backlight module.
  • the backlight module 10 of the present invention includes a surface light source 110, a fluorescent film 120, a support layer 130, a diffusion sheet 140, and a prism sheet 150.
  • the surface light source 110 has a light-emitting surface 114.
  • the surface light source 110 includes a substrate 111, a number of chips 112, and a reflective layer 113.
  • One surface of the substrate 111 has a plurality of metal traces 1111 and a plurality of pads 1112.
  • FIG. 5 is a distribution structure of the metal traces 1111 and the pads 1112 of the substrate 111.
  • the chip 112 is disposed on the substrate 111 and the chip 112 is correspondingly soldered to the pad 1112 on the metal trace 1111.
  • the reflective layer 113 covers the surface of the substrate 111 having the metal trace 1111.
  • a layer of reflective material is coated on the one surface of the substrate 111 to form a reflective layer 113, and the reflective layer 113 covers the metal trace 1111 on the substrate 111, thereby Increasing the refractive index and reflective rate can effectively improve the brightness of the lamp beads after sealing.
  • the reflective material may be phenol resin, epoxy resin, polyimide resin, polyester resin, white oil, etc.
  • the material used for the reflective layer 113 in this embodiment is white oil.
  • the chips 112 are arranged in an array on the substrate 111.
  • the size of the chips 112 is 100 ⁇ m-500 ⁇ m, and 20-50 chips 112 are provided per square centimeter of area. If a six-inch screen is used, the number of the chips 112 on the corresponding substrate 111 is 100-5000. Due to the need to consider the production cost and other issues, the surface light source 110 uses as small a chip 112 as possible, and the number of the chip 112 needs to be controlled within a relatively small range, per square centimeter In the area, 30 of the chips 112 are preferred, and the size of the chips 112 is preferably 200 ⁇ m.
  • the fluorescent film 120 covers the light emitting surface 114 of the surface light source 110; that is, after the chip 112 is arranged, a fluorescent film 120 is laminated on the chip 112 to pass the fluorescent light
  • the film 120 realizes color conversion.
  • the chip 112 is selected as a blue light chip 112
  • the fluorescent film 120 is a color conversion device, which partially converts the light emitted by the blue light chip 112 into green light and red light.
  • the supporting layer 130 is disposed on the fluorescent film 120.
  • the supporting layer 130 is a transparent adhesive film layer 132 (see FIG. 3).
  • a transparent adhesive film layer 132 see FIG. 3
  • one of organic silicone, acrylic resin, unsaturated polyester, polyurethane, and epoxy resin can be used as the material of the transparent adhesive film layer 132.
  • the transparent adhesive film layer 132 can be attached to the surface of the fluorescent film 120 by hot pressing or adhesive.
  • FIG. 6 is an optical path diagram of light refracted in the air layer 92 in the prior art.
  • the pillar 91 and the air layer 92 shown in FIG. 1 are used as the supporting layer 93 to increase the light mixing distance.
  • FIG. 7 is a light path diagram of light rays of the present invention refracted in the transparent adhesive film layer 132.
  • the transparent adhesive film layer 132 is used as a support layer 130 to increase the light mixing distance.
  • the thickness of the transparent adhesive film layer in this embodiment is set to d
  • d1 is the thickness required when the support layer 130 is the air layer 92
  • n0 is the refractive index of the air layer 92
  • n1 is the refractive index of the fluorescent film 120
  • n2 is the refractive index of the transparent adhesive film layer 132
  • ⁇ is the incident angle of light entering the support layer 130 from the fluorescent film 120.
  • the thickness of the transparent adhesive film layer 132 is related to the refractive index of the fluorescent film 120, and the use of a transparent medium material with a lower refractive index helps to reduce the thickness of the transparent adhesive film layer 132. Therefore, in this embodiment, the refractive index of the fluorescent film 120 is 1.1-1.4.
  • the refractive index may be 1.12, 1.13, 1.15; 1.21, 1.33, etc.
  • the diffusion sheet 140 covers the support layer 130.
  • the diffusion sheet 140 may adopt a single-layer structure or a multi-layer structure. In this embodiment, a single-layer structure is used.
  • the prism sheet 150 is provided on the diffusion sheet 140.
  • the single layer of the diffusion sheet 140 increases the transmittance of the module, thereby achieving a better light mixing effect and an efficient light emitting effect.
  • the present invention also provides a display device 1.
  • the display device 1 according to the present invention may be a Mini-LED display device.
  • the following uses the Mini-LED display device as an example. To further explain its structure.
  • the Mini-LED display device has the backlight module 10 and an encapsulating plastic frame 20.
  • the encapsulating plastic frame 20 is wrapped around the side of the backlight module 10. Since the diffusion sheet 140 in the backlight module 10 falls on the transparent adhesive film layer 132, the transparent adhesive film layer 132 forms a support, which enhances the mechanical reliability of the backlight module 10, and at the same time, The presence of the transparent adhesive film layer 132 also achieves the light mixing distance of the Mini-LED display device 1, and in this embodiment, the diffusion sheet 140 is a layer, which increases the light transmittance, thereby achieving Good light mixing effect and efficient light output effect.
  • the main design point of the present invention lies in the structure of the backlight module 10, and other structures such as display panels, frames, etc. will not be described in detail.

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

Abstract

一种背光模组（10）及具有该背光模组（10）的显示装置（1），背光模组（10）包括面光源（110），具有一发光面（114）；荧光膜（120），覆于面光源（110）的发光面（114）；支撑层（130），设于荧光膜（120）上，支撑层（130）为透明胶膜层（132）；扩散片（140），覆于支撑层（130）上。背光模组（10）及具有该背光模组（10）的显示装置（1），在保证较高的光效的前提下，减少背光模组（10）中扩散片（140）的层数，增加了光线的透过率，从而实现了较好的混光效果和高效的出光效果实现均匀混光和减薄背光模组（10）的目的。

Description

背光模组及具有该背光模组的显示装置 技术领域
本发明涉及显示器领域，具体为一种背光模组及具有该背光模组的显示装置。
 背景技术
Mini-LED又名“次毫米发光二极管”，意指晶粒尺寸约在100微米的LED。Mini-LED由于其高亮、柔性、低功耗、轻薄以及可以制作窄边框样品等诸多优势受到诸多厂商的广泛关注。
Mini-LED在组装背光模组时，需要满足混光均匀以及尽可能高的光效特性。混光均匀性即要求Mini-LED在使用单张扩散片时，具有一定的混光距离；或采用多张扩散片相互叠加的方式进行混光。如图1所示，现有的背光模组9在使用单张扩散片90时，利用垫高柱91和空气层92来作为支撑层93以增加混光距离。但是，混光距离的存在给Mini-LED背光源的实际量产带来较大的挑战，会造成良率偏低，不利于其成本降低。详细来讲，如图2所示，图2为采用图1混光方式的背光模组的剖视图，从图2中可以看出，背光模组9中无法加入图1所示的垫高柱91的结构，导致面光源94和扩散片90间存在一镂空间隙，但是扩散片90由于重力或振荡等因素导致膜片松动或者脱落，造成镂空间隙改变，导致miniLED的混光不均。因此，对于采用单张扩散片90并预留一定混光距离的混光方式，在组装背光模组9过程中，由于框胶8的限制无法实现大规模量产，信赖性也存在较大的风险，而采用多张扩散膜片的混光方式会降低Mini-LED的光效。如何在保证光效和混光效果的前提下实现Mini-LED背光模组的可行性，成为Mini-LED应用过程中需要重点解决的问题。
 技术问题
为了解决上述技术问题，本发明提供了一种背光模组及具有该背光模组的显示装置，通过透明胶膜层来增加混光距离，以代替垫高柱和空气层，从而使扩散片在背光模组中具有支撑，在保证较高的光效的前提下，减少背光模组中扩散片的层数，实现均匀混光和减薄背光模组的目的。
 技术解决方案
解决上述问题的技术方案是：提供一种背光模组，包括一面光源，具有一发光面；一荧光膜，覆于所述面光源的发光面；一支撑层，设于所述荧光膜上，所述支撑层为透明胶膜层；一扩散片，覆于所述支撑层上。
在本发明一实施例中，所述透明胶膜层的厚度为d，
d=d1(n22-n12sin2α)0.5/(n02-n12sin2α)0.5；
其中d1为所述支撑层为空气层时所需的厚度，n0为所述空气层的折射率，n1为所述荧光膜的折射率，n2为所述透明胶膜层的折射率，α为光线从所述荧光膜进入所述支撑层的入射角。
在本发明一实施例中，所述荧光膜的折射率为1.1-1.4。
在本发明一实施例中，所述面光源包括基板，其中一表面具有多个金属走线；以及若干芯片，设于所述基板上且对应的连接于所述金属走线。
在本发明一实施例中，所述面光源还包括反射层，所述反射层覆于所述基板的具有金属走线的所述其中一表面上。
在本发明一实施例中，所述反射层所用的反光材料为酚醛树脂、环氧树脂、聚酰亚胺树脂、聚酯树脂、白油中的一种。
在本发明一实施例中，所述芯片为蓝光芯片；所述芯片的尺寸为100μm-500μm。
在本发明一实施例中，所述扩散片的层数为一层。
在本发明一实施例中，所述的背光模组还包括棱镜片，设于所述扩散片上。
本发明还提供了一种显示装置，具有所述的背光模组以及封装胶框，所述封装胶框包覆于所述背光模组的边侧。
 有益效果
本发明的有益效果是：本发明的背光模组及具有该背光模组的显示装置，通过透明胶膜层来增加混光距离，以代替垫高柱和空气层，从而使扩散片在背光模组中具有支撑，在保证较高的光效的前提下，减少背光模组中扩散片的层数，增加了光线的透过率，从而实现了较好的混光效果和高效的出光效果实现均匀混光和减薄背光模组的目的。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
下面结合附图和实施例对本发明作进一步解释。
图1是现有技术中的背光模组的剖视图。
图2图1中封装后的背光模组的剖视图。
图3是本发明实施例的背光模组的剖视图。
图4是本发明实施例的面光源的剖视图。
图5是本发明实施例基板的金属走线和焊盘的一种分布结构图。
图6是现有技术中光线在空气层内发生折射的光路图。
图7是本发明实施例的光线在透明胶膜层内发生折射的光路图。
图8是本发明实施例的显示装置的结构示意图，主要体现封装后的背光模组结构。
附图标记为：
1显示装置，
10背光模组；           20封装胶框；
110面光源；            120荧光膜；
130支撑层；            140扩散片；
150棱镜片；            111基板；
112芯片；              113反射层；
114发光面；
1111金属走线；          1112焊盘；
9现有的背光模组；       8胶框；
90扩散片；              91垫高柱；
92空气层；              93支撑层。
 本发明的实施方式
下面详细描述本发明的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
以下实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「顶」、「底」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
如图3所示，在一实施例中，本发明背光模组10包括面光源110、荧光膜120、支撑层130、扩散片140以及棱镜片150。
如图4所示，所述面光源110具有一发光面114。本实施例中，所述面光源110包括基板111、若干芯片112以及反射层113。所述基板111的其中一表面具有多个金属走线1111及多个焊盘1112，如图5所示，图5为所述基板111的金属走线1111和焊盘1112的一种分布结构。
请同时参照图4、图5，所述芯片112设于所述基板111上且所述芯片112对应的焊接于所述金属走线1111上的焊盘1112。所述反射层113覆于所述基板111的具有金属走线1111的所述其中一表面。
在固晶作业时，先在所述基板111的所述其中一表面涂覆一层反光材料，形成反射层113，所述反射层113覆盖所述基板111上的所述金属走线1111，从而提高折射率和反光率，在封胶后能有效的提高灯珠亮度。所述反光材料可采用酚醛树脂、环氧树脂、聚酰亚胺树脂、聚酯树脂、白油等，本实施例中的反射层113所用材料采用白油。然后在所述基板111上采用回流焊工艺进行固晶作业。
本实施例中，所述芯片112阵列排布于所述基板111上，所述芯片112的尺寸为100μm-500μm，每平方厘米的面积中，设置20-50颗所述芯片112。若采用六寸屏，那么所对应的基板111上的所述芯片112的数量在100-5000颗。由于需要考虑生产成本等方面的问题，因此，在制备时所述面光源110，尽可能利用小尺寸的芯片112，而所述芯片112数量也需要控制在较少的范围内，每平方厘米的面积中，优选30颗所述芯片112，所述芯片112的尺寸优选为200μm。
如图3所示，所述荧光膜120覆于所述面光源110的发光面114；即布置完所述芯片112后，在所述芯片112的上压覆一荧光膜120，通过所述荧光膜120实现颜色转换。本实施例中，所述芯片112选用为蓝光芯片112，所述荧光膜120为颜色转换装置，将所述蓝光芯片112发出的光部分转换成绿光和红光。
所述支撑层130设于所述荧光膜120上，本实施例中，所述支撑层130为透明胶膜层132（见图3）。如可选用有机硅胶、丙烯酸型树脂及不饱和聚酯、聚氨酯、环氧树脂中的一种作为透明胶膜层132的材料。所述透明胶膜层132可以通过热压或胶粘的方式贴合于所述荧光膜120的表面。
由于混光效率与所述透明胶膜层132的折射率、厚度等相关，因此同时参见图6和图7所示，图6为现有技术中光线在空气层92内发生折射的光路图，图6中是采用如图1所示垫高柱91和空气层92来作为支撑层93以增加混光距离的。图7为本发明的光线在所述透明胶膜层132内发生折射的光路图，图7中是利用所述透明胶膜层132作为支撑层130来增加混光距离的。
本实施例中的所述透明胶膜层的厚度若设为d，则
d=d1(n22-n12sin2α)0.5/(n02-n12sin2α)0.5，
其中d1为所述支撑层130为空气层92时所需的厚度，n0为所述空气层92的折射率，n1为所述荧光膜120的折射率，n2为透明胶膜层132的折射率，α为光线从所述荧光膜120进入所述支撑层130的入射角。
由此可见，所述透明胶膜层132的厚度与所述荧光膜120的折射率有关，其中采用折射率较低的透明介质材料，有助于减薄所述透明胶膜层132厚度。因此，本实施例中，所述荧光膜120的折射率为1.1-1.4，如折射率可以选择1.12，1.13，1.15；1.21,1.33等等。
如图3所示，所述扩散片140覆于所述支撑层130上。一般情况下，所述扩散片140可以采用单层结构也可以采用多层结构，本实施例采用的是单层结构。所述棱镜片150设于所述扩散片140上。单层的所述扩散片140增加了模组透过率，从而实现了较好的混光效果和高效的出光效果。
如图8所示，在其一实施例中，本发明还提供了一种显示装置1，本发明所述的显示装置1可以是Mini-LED显示装置，下面就以Mini-LED显示装置为例，对其结构进行进一步说明。
所述Mini-LED显示装置具有所述背光模组10以及封装胶框20，所述封装胶框20包覆于所述背光模组10的边侧。由于所述背光模组10中的扩散片140落于所述透明胶膜层132的上方，所述透明胶膜层132形成支撑，增强了所述背光模组10的机械信赖性，同时，所述透明胶膜层132的存在也实现了Mini-LED显示装置1的混光距离，而且，本实施例中，所述扩散片140为一层，增加了光线的透过率，从而实现了较好的混光效果和高效的出光效果。
本发明的主要设计要点在于背光模组10结构，对于显示面板、框架等其他结构不再一一赘述。
以上仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种背光模组，其包括
    面光源，具有一发光面；
    荧光膜，覆于所述面光源的发光面；
    支撑层，设于所述荧光膜上，所述支撑层为透明胶膜层；以及
    扩散片，覆于所述支撑层上。
  2. 根据权利要求1所述的背光模组，其中，所述透明胶膜层的厚度设为d，d=d 1(n 2 2-n 1 2sin 2α) 0.5/(n 0 2-n 1 2sin 2α) 0.5；其中d 1为所述支撑层为空气层时所需的厚度，n 0为所述空气层的折射率，n 1为所述荧光膜的折射率，n 2为所述透明胶膜层的折射率，α为光线从所述荧光膜进入所述支撑层的入射角。
  3. 根据权利要求2所述的背光模组，其中，所述荧光膜的折射率为1.1-1.4。
  4. 根据权利要求1所述的背光模组，其中，所述面光源包括
    基板，在其中一表面具有多个金属走线；以及
    若干芯片，设于所述基板上且对应的连接于所述金属走线。
  5. 根据权利要求4所述的背光模组，其中，所述面光源还包括反射层，所述反射层覆于所述基板的具有金属走线的所述其中一表面上。
  6. 根据权利要求5所述的背光模组，其中，所述反射层所用的反光材料为酚醛树脂、环氧树脂、聚酰亚胺树脂、聚酯树脂、白油中的一种。
  7. 根据权利要求4所述的背光模组，其中，所述芯片为蓝光芯片；所述芯片的尺寸为100μm-500μm。
  8. 根据权利要求1所述的背光模组，其中，所述扩散片的层数为一层。
  9. 根据权利要求1所述的背光模组，其还包括棱镜片，设于所述扩散片上。
  10. 一种显示装置，其具有如权利要求1所述的背光模组以及封装胶框，所述封装胶框包覆于所述背光模组的边侧。
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