WO2021017249A1 - 背光模组及液晶显示装置 - Google Patents

背光模组及液晶显示装置 Download PDF

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Publication number
WO2021017249A1
WO2021017249A1 PCT/CN2019/115715 CN2019115715W WO2021017249A1 WO 2021017249 A1 WO2021017249 A1 WO 2021017249A1 CN 2019115715 W CN2019115715 W CN 2019115715W WO 2021017249 A1 WO2021017249 A1 WO 2021017249A1
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WIPO (PCT)
Prior art keywords
light
backlight module
light diffusion
diameter
diffusion layer
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Ceased
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PCT/CN2019/115715
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English (en)
French (fr)
Inventor
余朋飞
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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 US16/623,586 priority Critical patent/US11314126B2/en
Publication of WO2021017249A1 publication Critical patent/WO2021017249A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • G02F1/0009—Materials therefor
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide

Definitions

  • This application relates to the field of display technology, and in particular to a backlight module and a liquid crystal display device.
  • the display mechanism of a liquid crystal display is based on a backlight module that provides white light.
  • the liquid crystal display panel receives the white light and obtains a colorful display screen through the light imaging principle of the liquid crystal display panel.
  • the side-type liquid crystal display device includes multiple light-emitting diodes (Light Emitting Diode, LED) designed side by side as a point light source.
  • LED Light Emitting Diode
  • the light-emitting diode (Light Emitting Diode) Guide Plate, LGP) and diffusion film and other film layers work together to disperse the point light source into a surface light source to provide a backlight for the liquid crystal display panel. Since the LED light bar is composed of multiple LEDs, the misalignment of the LED light bar-LGP causes a certain distance of no light source area between adjacent LED lights.
  • the LED lamp side reflector when the LED lamp side reflector is deformed, a certain distance of no light source area and The deformation of the reflection sheet on the side of the LED lamp will cause the liquid crystal display device to form a clear LED light path and lamp shadow on the light incident side during operation, which affects the display effect of the liquid crystal display device.
  • the purpose of the present application is to provide a backlight module and a liquid crystal display device to solve the problem of obvious LED light path and lamp shadow formed on the light incident side when the liquid crystal display device is working.
  • a backlight module, the backlight module includes:
  • each of the LEDs has a light-emitting surface, and the light-emitting surface of each of the LEDs is provided with a diffusion layer.
  • the diffusion layer includes a transparent adhesive and light diffusion particles.
  • the light diffusion particles include organic light diffusion particles and inorganic light diffusion particles.
  • the ratio of the refractive index of the transparent adhesive to the refractive index of the organic light diffusion particles ranges from 1.05 to 1.08.
  • the ratio of the refractive index of the transparent adhesive to the refractive index of the inorganic light diffusion particles ranges from 0.93 to 0.98.
  • the number of the organic light diffusion particles is more than the number of the inorganic light diffusion particles.
  • the transparent adhesive is selected from at least one of epoxy resin and silicone.
  • the organic light diffusion particles are selected from at least one of acrylate, silicone and polyethylene, and the inorganic light diffusion particles are selected from at least one of barium sulfate, silicon dioxide and calcium carbonate.
  • the backlight module is an edge-type backlight module.
  • the diffusion layer includes a first diffusion layer and a second diffusion layer, the first diffusion layer is disposed between the LED light-emitting surface and the second diffusion layer, and the first diffusion layer
  • the layer includes first light diffusion particles having a first diameter
  • the second diffusion layer includes second light diffusion particles having a second diameter, wherein the first diameter is greater than the second diameter, and the first diameter Is the diameter of the smallest sphere corresponding to the first light diffusion particle, and the second diameter is the diameter of the smallest sphere corresponding to the second light diffusion particle.
  • a liquid crystal display device includes a backlight module and a plurality of LEDs, each of the LEDs has a light-emitting surface, and the light-emitting surface of each of the LEDs is provided with a diffusion layer.
  • the diffusion layer includes a transparent adhesive and light diffusion particles.
  • the light diffusion particles include organic light diffusion particles and inorganic light diffusion particles.
  • the ratio of the refractive index of the transparent adhesive to the refractive index of the organic light diffusion particles ranges from 1.05 to 1.08.
  • the ratio of the refractive index of the transparent adhesive to the refractive index of the inorganic light diffusion particles ranges from 0.93 to 0.98.
  • the number of the organic light diffusion particles is greater than the number of the inorganic light diffusion particles.
  • the transparent adhesive is selected from at least one of epoxy resin and silicone.
  • the organic light diffusion particles are selected from at least one of acrylate, silicone, and polyethylene, and the inorganic light diffusion particles are selected from at least one of barium sulfate, silicon dioxide, and calcium carbonate.
  • the backlight module is an edge-type backlight module.
  • the diffusion layer includes a first diffusion layer and a second diffusion layer, the first diffusion layer is disposed between the LED light-emitting surface and the second diffusion layer, and the first diffusion layer
  • the layer includes first light diffusion particles having a first diameter
  • the second diffusion layer includes second light diffusion particles having a second diameter, wherein the first diameter is greater than the second diameter, and the first diameter Is the diameter of the smallest sphere corresponding to the first light diffusion particle, and the second diameter is the diameter of the smallest sphere corresponding to the second light diffusion particle.
  • the present application provides a backlight module and a liquid crystal display device.
  • a diffusion layer on the light-emitting surface of a plurality of LEDs, the distribution angle of the light emitted by the LEDs is increased, and the brightness of the light emitted by the LEDs in all directions is more uniform.
  • the generated LED light path and lamp shadow make the backlight module emit light of uniform brightness and improve the display quality of the liquid crystal display device.
  • FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the application
  • FIG. 2 is a schematic diagram of multiple LEDs arranged on a printed circuit board in the backlight module shown in FIG. 1.
  • FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the application
  • FIG. 2 is a schematic diagram of multiple LEDs arranged on a printed circuit board of the backlight module shown in FIG.
  • the backlight module 100 is an edge-type backlight module.
  • the backlight module 100 includes a plurality of LEDs 10, a back plate 11, a reflective sheet 12, a light guide plate 13, an optical film 14, a middle frame 15, a printed circuit board 16, and a diffusion layer 17. .
  • the plurality of LEDs 10 are used as point light sources, and the plurality of LEDs 10 are arranged on the circuit of the printed circuit board 16 through an adhesive.
  • the multiple LEDs 10 and the printed circuit board 16 constitute an LED light bar.
  • the LED light bar is arranged on the side wall 111 of the back plate 11, and the light emitting surface of the plurality of LEDs 10 faces the light incident surface of the light guide plate 13.
  • Each LED 10 has a light-emitting surface, and the light-emitting surface of each LED is provided with a diffusion layer 17.
  • a diffusion layer is coated on the entire LED light bar so that the diffusion layer 17 is formed on the light-emitting surfaces of the multiple LEDs 10 to simplify the process of forming the diffusion layer 17 on the light-emitting surfaces of the multiple LEDs 10.
  • the light emitted by multiple LEDs 10 is disrupted and atomized by the diffusion layer 17.
  • the diffusion layer 17 increases the distribution angle of the light emitted by each LED 10, and the brightness of the light emitted by the LED 10 is more uniform, realizing the transformation of the LED 10 from a point light source to a linear light source , Eliminate the dark area between two adjacent LEDs 10, so that the light entering the light guide plate 13 is light with the same brightness.
  • the light guide plate 13 is used to receive the light emitted by the plurality of LEDs 10 and mix the light, so that the light incident on the light guide plate 13 becomes a surface light source.
  • the light guide plate 13 is arranged in the back plate 11, a reflective sheet 12 is arranged between the light guide plate 13 and the bottom plate 110 of the back plate 11, the light guide plate 13 has a light incident surface close to the plurality of LEDs 10, and the optical film 14 is arranged on the light guide plate 13 The shiny side.
  • the surface of the light guide plate 13 close to the reflective sheet 12 is provided with dots (not shown).
  • the middle frame 15 is fixed on the side wall 111 of the back plate 11 for fixing a liquid crystal display panel and the like.
  • the light with uniform brightness is incident on the light-incident surface of the light guide plate 13, part of the light is incident on the reflective sheet 12, and then reflected to the light guide plate 13, and the light in the light guide plate 13 After reflection by the dots, the light is uniformly mixed through multiple reflections in the light guide plate 13, so that the brightness of the light emitted from the light exit surface of the light guide plate 13 is more uniform.
  • the light emitted from the light-emitting surface of the light guide plate 13 undergoes processing such as diffusion and aggregation by the optical film 14, and the brightness becomes more uniform.
  • the light emitted by the light guide plate 13 is processed by a lower diffusion sheet (not shown), a lower prism sheet (not shown), an upper prism sheet (not shown), and an upper diffusion sheet (not shown) in order to make the backlight mold
  • the brightness of the light emitted by the group 100 is more uniform.
  • the diffusion layer 17 includes a first diffusion layer and a second diffusion layer.
  • the first diffusion layer is disposed between the light exit surface of the LED 10 and the second diffusion layer.
  • the first diffusion layer includes first light diffusion particles with a first diameter
  • the diffusion layer includes second light diffusion particles having a second diameter, wherein the first diameter is greater than the second diameter, the first diameter is the diameter of the smallest sphere corresponding to the first light diffusion particles, and the second diameter is the second light diffusion The diameter of the smallest sphere corresponding to the particle.
  • the second light diffusion particles with the second diameter are further diffused, the light distribution angle is further increased, and the brightness of the light in different directions is further uniformized.
  • the dark area between two adjacent LEDs 10 disappears, and each angle The brightness of the light incident on the light guide plate 13 is uniform.
  • the first diffusion layer includes a first transparent adhesive and first light diffusion particles with a first diameter
  • the second diffusion layer includes a second transparent adhesive and second light diffusion particles with a second diameter.
  • the first transparent adhesive The ratio of the refractive index of the adhesive to the refractive index of the first light diffusion particles is greater than the refractive index of the second transparent adhesive and the refractive index of the second light diffusion particles, so as to further improve the light diffusion effect of the diffusion layer 17.
  • the refractive index of the first diffusion particle and the refractive index of the second diffusion particle may be the same or different.
  • Both the first diffusion particles and the second diffusion particles are organic light diffusion particles, which are beneficial to increase the transmittance of the light emitted by the LED 10 in the diffusion layer 17.
  • the refractive index of the first transparent adhesive is greater than the refractive index of the second transparent adhesive, so that the light emitted by the LED has a good diffusion effect in the diffusion layer 17 and at the same time increases the light transmittance in the diffusion layer 17.
  • the diffusion layer 17 includes a transparent adhesive and light diffusion particles.
  • Light diffusion particles include organic light diffusion particles and inorganic light diffusion particles.
  • Organic light diffusion particles have good light transmittance, and light is refracted, reflected and scattered between the organic light diffusion particles and the transparent adhesive, so that the LED10 emits While the light diffuses, the light emitted by the LED has a high transmittance in the diffusion layer 17; the inorganic light diffusion particles have good thermal conductivity, which prevents the high temperature of the LED10 from causing the high temperature of the diffusion layer 17 and affecting the diffusion layer 17 to the LED10.
  • the light diffusion effect, and the light will also be refracted, reflected and scattered between the inorganic light diffusion particles and the transparent adhesive, and also play a role in diffusing the light emitted by the LED, that is, the light diffusion particles include organic light diffusion particles and Inorganic light diffusion particles make the light emitted by the LED have a large distribution angle and better brightness uniformity.
  • the light emitted by the LED has a high transmittance through the diffusion layer 17, and can prevent the high temperature of the LED from affecting the diffusion The role of layer 17.
  • the transparent adhesive is selected from at least one of epoxy resin and silicone.
  • the organic light diffusing particles are selected from acrylate, silicone, and polyethylene.
  • the inorganic light diffusion particles are selected from at least one of barium sulfate, silica, and calcium carbonate.
  • the size of the organic light diffusion particles is larger than the size of the inorganic light diffusion particles.
  • the size of inorganic light diffusion particles is on the nanometer level, and the size of organic light diffusion particles is on the micrometer level.
  • the number of organic light diffusion particles is greater than the number of inorganic light diffusion particles to ensure that the diffusion layer 17 has a good diffusion effect on the light emitted by the LED 10 and at the same time further improve the light transmittance through the diffusion layer 17.
  • the ratio of the refractive index of the transparent adhesive to the refractive index of the organic light-diffusing particles ranges from 1.05-1.08 to prevent the large refractive index of the transparent adhesive from causing the light emitted by the LED 10 to fall on the transparent adhesive. Total reflection occurs at the interface with the air, which causes the light transmittance of the light passing through the diffusion layer 17 to be too small, and the light flux reaching the light guide plate 13 is small.
  • the transparent adhesive is epoxy resin
  • the organic light diffusion particles are organic silicon particles.
  • the ratio of the refractive index of the transparent adhesive to the refractive index of the inorganic light diffusion particles ranges from 0.93 to 0.98 to ensure that the reflection and scattering of light between the inorganic light diffusion particles and the transparent adhesive are further improved.
  • the diffusion effect of the diffusion layer 17 on the light emitted by the plurality of LEDs 10 is further improved.
  • the transparent adhesive is organic silicon
  • the inorganic light diffusion particles are nano-calcium carbonate.
  • the present application also provides a liquid crystal display device.
  • the liquid crystal display device includes the above-mentioned backlight module and a liquid crystal display panel.
  • the liquid crystal display panel is arranged on the side of the light emitting surface of the backlight module.
  • the liquid crystal display device of the present application forms a diffusion layer on the light-emitting surface of a plurality of LEDs to increase the distribution angle of the light emitted by the LED, and make the brightness of the light emitted from each direction of the LED more uniform, so as to realize the LED from a point light source to a linear light source Transform to eliminate the dark area between two adjacent LEDs, so that the light entering the light guide plate is light with the same brightness, which can effectively reduce the lamp shadow and LED light path caused by the misalignment between the LED and the light guide plate and the deformation of the reflector. , So that the backlight module emits light with uniform brightness, thereby improving the display quality of the liquid crystal display device.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
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  • Dispersion Chemistry (AREA)
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Abstract

本申请提供一种背光模组及液晶显示装置，通过在多个LED的出光表面上形成扩散层，可有效避免由于LED与导光板之间错位以及反射片变形而产生的灯影及LED光路，使背光模组发出均一亮度的光，提高液晶显示装置的显示品质。

Description

背光模组及液晶显示装置 技术领域
本申请涉及显示技术领域，尤其涉及一种背光模组及液晶显示装置。
 背景技术
液晶显示装置（Liquid Crystal Display，LCD）的显示机理是基于背光模组提供白光，液晶显示面板接收白光并通过液晶显示面板的光成像原理而得到丰富多彩的显示画面。
侧入式液晶显示装置包括多颗并排设计的发光二极管（Light Emitting Diode，LED）以作为点光源，液晶显示装置工作时，多颗发光二极管同时点亮，通过导光板（Light Guide Plate，LGP）及扩散膜等膜层的共同作用，将点光源分散为面光源以为液晶显示面板提供背光源。由于LED灯条为多颗LED等组成，LED灯条-LGP发生错位使得相邻的LED灯间存在一定距离的无光源区，另外，LED灯侧反射片变形时，一定距离的无光源区以及LED灯侧反射片变形均会导致液晶显示装置在工作时在入光侧会形成明显的LED光路及灯影，影响液晶显示装置的显示效果。
 技术问题
本申请的目的在于提供一种背光模组及液晶显示装置，以解决液晶显示装置工作时会在入光侧形成明显的LED光路及灯影的问题。
 技术解决方案
一种背光模组，所述背光模组包括：
多个LED，每个所述LED具有一出光表面，每个所述LED的出光表面设置有扩散层。
在上述背光模组中，所述扩散层包括透明胶黏剂和光扩散粒子。
在上述背光模组中，所述光扩散粒子包括有机光扩散粒子和无机光扩散粒子。
在上述背光模组中，所述透明胶黏剂的折射率与所述有机光扩散粒子的折射率的比值的取值范围为1.05-1.08。
在上述背光模组中，所述透明胶黏剂的折射率与所述无机光扩散粒子的折射率的比值的取值范围为0.93-0.98。
在上述背光模组中，所述有机光扩散粒子的数目多于所述无机光扩散粒子的数目。
在上述背光模组中，所述透明胶黏剂选自环氧树脂以及有机硅中的至少一种。
在上述背光模组中，所述有机光扩散粒子选自丙烯酸酯、有机硅以及聚乙烯中的至少一种，所述无机光扩散粒子选自硫酸钡、二氧化硅以及碳酸钙中的至少一种。
在上述背光模组中，所述背光模组为侧入式背光模组。
在上述背光模组中，所述扩散层包括第一扩散层和第二扩散层，所述第一扩散层设置于所述LED出光表面和所述第二扩散层之间，所述第一扩散层包括具有第一直径的第一光扩散粒子，所述第二扩散层包括具有第二直径的第二光扩散粒子，其中，所述第一直径大于所述第二直径，所述第一直径为所述第一光扩散粒子所对应的最小球体的直径，所述第二直径为所述第二光扩散粒子所对应的最小球体的直径。
一种液晶显示装置，所述液晶显示装置包括背光模组，多个LED，每个所述LED具有一出光表面，每个所述LED的出光表面设置有扩散层。
在上述液晶显示装置中，所述扩散层包括透明胶黏剂和光扩散粒子。
在上述液晶显示装置中，所述光扩散粒子包括有机光扩散粒子和无机光扩散粒子。
在上述液晶显示装置中，所述透明胶黏剂的折射率与所述有机光扩散粒子的折射率的比值的取值范围为1.05- 1.08。
在上述液晶显示装置中，所述透明胶黏剂的折射率与所述无机光扩散粒子的折射率的比值的取值范围为0.93-0.98。
在上述液晶显示装置中，所述有机光扩散粒子的数目多于所述无机光扩散粒子的数目。
在上述液晶显示装置中，所述透明胶黏剂选自环氧树脂以及有机硅中的至少一种。
在上述液晶显示装置中，所述有机光扩散粒子选自丙烯酸酯、有机硅以及聚乙烯中的至少一种，所述无机光扩散粒子选自硫酸钡、二氧化硅以及碳酸钙中的至少一种。
在上述液晶显示装置中，所述背光模组为侧入式背光模组。
在上述液晶显示装置中，所述扩散层包括第一扩散层和第二扩散层，所述第一扩散层设置于所述LED出光表面和所述第二扩散层之间，所述第一扩散层包括具有第一直径的第一光扩散粒子，所述第二扩散层包括具有第二直径的第二光扩散粒子，其中，所述第一直径大于所述第二直径，所述第一直径为所述第一光扩散粒子所对应的最小球体的直径，所述第二直径为所述第二光扩散粒子所对应的最小球体的直径。
 有益效果
本申请提供一种背光模组及液晶显示装置，通过在多个LED的出光表面上形成扩散层，以使LED发出光线的分布角度增大，且使LED各方向发出的光线亮度更加均一化，实现LED从点光源向线光源转变，消除相邻两个LED之间的暗区，使进入到导光板中的光线为同一亮度的光，从而避免由于LED与导光板之间错位以及反射片变形而产生的LED光路以及灯影，使背光模组发出均一亮度的光，提高液晶显示装置的显示品质。
 附图说明
图1为本申请实施例背光模组的示意图；
图2为图1所示背光模组中印刷电路板上设置多个LED的示意图。
 本发明的实施方式
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。
请参阅图1及图2，图1为本申请实施例背光模组的示意图，图2为图1所示背光模组中印刷电路板上设置多个LED的示意图。背光模组100为侧入式背光模组，背光模组100包括多个LED10、背板11、反射片12、导光板13、光学膜片14、中框15、印刷电路板16以及扩散层17。
多个LED10作为点光源，多个LED10通过胶黏剂设置于印刷电路板16的电路上。多个LED10和印刷电路板16构成LED灯条。LED灯条设置于背板11的侧壁111上，且多个LED10的出光面朝向导光板13的入光面。每个LED10具有一出光表面，每个LED的出光表面设置有扩散层17。通过在整个LED灯条上涂覆一层扩散层以使扩散层17形成于多个LED10的出光表面上，以简化在多个LED10的出光表面上形成扩散层17的工艺。
多个LED10发出的光线通过扩散层17打乱且雾化，扩散层17使每个LED10发出光线的分布角度增大，且LED10发出的光线亮度更加均一化，实现LED10从点光源向线光源转变，消除相邻两个LED10之间的暗区，使进入到导光板13中的光线为同一亮度的光。即使LED10与导光板13之间错位，由于每个LED10发出的光的分布角度增大使得相邻两个LED10之间不存在暗区或者暗区明显减小，使得在导光板13的入光面不会出现暗区，也就不会出现多个LED发出的光由于明暗相衬而出现LED光路；且由于每个LED10发出的光线亮度均一性更好，即使反射片12变形，也不会明显影响光被变形反射片12反射至导光板13中的亮度，也就不会产生LED10光路以及灯影。
导光板13用于将接收的多个LED10发出的光并将光进行混合，以将入射至导光板13的光变为面光源。导光板13设置于背板11内，导光板13与背板11的底板110之间设置有反射片12，导光板13具有靠近多个LED10的入光面，光学膜片14设置于导光板13的出光面。导光板13靠近反射片12的表面设置有网点（未示出）。中框15固定于背板11的侧壁111上以用于固定液晶显示面板等。
多个LED10发出的光经过扩散层17后，亮度均一的光入射至导光板13的入光面，部分光射入至反射片12后，经反射至导光板13，而导光板13中的光经过网点反射后，在导光板13中经过多次反射等使得光被均匀混合，使得从导光板13的出光面射出的光亮度更加均一化。导光板13的出光面射出的光经过光学膜片14的扩散以及聚集等处理，亮度变得更加均一化。其中，导光板13发出的光依次经过下扩散片（未示出）、下棱镜片（未示出）、上棱镜片（未示出）以及上扩散片（未示出）处理，使背光模组100发出的光的亮度更加均一化。
扩散层17包括第一扩散层和第二扩散层，第一扩散层设置于LED10出光表面和第二扩散层之间，第一扩散层中包括具有第一直径的第一光扩散粒子，第二扩散层中包括具有第二直径的第二光扩散粒子，其中，第一直径大于第二直径，第一直径为第一光扩散粒子所对应的最小球体的直径，第二直径为第二光扩散粒子所对应的最小球体的直径。LED10发出的光经过比表面积较小的具有第一直径的第一光扩散粒子扩散后，光的分布角度被初步地增大并且不同方向的光亮度被初步的均匀化，再经过比表面积较大的具有第二直径的第二光扩散粒子进一步地扩散，光的分布角度被进一步地增大且不同方向的光亮度被进一步地均匀化，相邻两个LED10之间的暗区消失，各个角度入射至导光板13中的光亮度均一。
第一扩散层包括第一透明胶黏剂和具有第一直径的第一光扩散粒子，第二扩散层包括第二透明胶黏剂和具有第二直径的第二光扩散粒子，第一透明胶黏剂的折射率与第一光扩散粒子的折射率的比值大于第二透明胶黏剂的折射率与第二光扩散粒子的折射率，以进一步地提高扩散层17对光扩散效果。第一扩散粒子的折射率和第二扩散粒子的折射率可以相同或不相同。第一扩散粒子和第二扩散粒子均为有机光扩散粒子，有利于提高LED10发出的光在扩散层17中的透过率。第一透明胶黏剂的折射率大于第二透明胶黏剂的折射率以使得LED发出的光在扩散层17中的扩散效果佳的同时，提高光在扩散层17中的透过率。
扩散层17包括透明胶黏剂和光扩散粒子。光扩散粒子包括有机光扩散粒子和无机光扩散粒子，有机光扩散粒子具有良好的透光性，且光在有机光扩散粒子和透明胶黏剂之间发生折射、反射以及散射，使LED10发出的光扩散的同时，LED发出的光在扩散层17的透过率高；无机光扩散粒子具有良好的导热性，避免LED10工作时温度高而导致扩散层17温度高，影响扩散层17对LED10发出光的扩散效果，且光在无机光扩散粒子和透明胶黏剂之间也会发生折射、反射以及散射，也起到使LED发出的光扩散的作用，即光扩散粒子包括有机光扩散粒子和无机光扩散粒子，使LED发出的光具有大的分布角度以及更好的亮度均一性的同时，LED发出的光穿过扩散层17的透光率高，且能避免LED温度较高而影响扩散层17的作用。透明胶黏剂选自环氧树脂以及有机硅中的至少一种。有机光扩散粒子选自丙烯酸酯、有机硅以及聚乙烯。无机光扩散粒子选自硫酸钡、二氧化硅以及碳酸钙中的至少一种。
有机光扩散粒子的尺寸大于无机光扩散粒子的尺寸。无机光扩散粒子的尺寸为纳米级，有机光扩散粒子的尺寸为微米级。扩散层17中，有机光扩散粒子的数目大于无机光扩散粒子的数目，以保证扩散层17对LED10发出的光具有良好的扩散效果的同时，进一步地提高光通过扩散层17的透过率。
进一步地，透明胶黏剂的折射率与有机光扩散粒子的折射率的比值的取值范围为1.05-1.08，避免透明胶黏剂的折射率较大而导致LED10发出的光在透明胶黏剂和空气之间的界面发生全反射，而导致光穿过扩散层17的透光率太小，到达导光板13的光通量较少。具体地，透明胶黏剂为环氧树脂，有机光扩散粒子为有机硅粒子。
进一步地，透明胶黏剂的折射率与无机光扩散粒子的折射率的比值的取值范围为0.93-0.98，以保证进一步地提高光在无机光扩散粒子和透明胶粘剂之间进行反射以及散射的效果，进一步地提高扩散层17对多个LED10发出的光的扩散效果。具体地，透明胶黏剂为有机硅，无机光扩散粒子为纳米碳酸钙。
本申请还提供一种液晶显示装置，液晶显示装置包括上述背光模组以及液晶显示面板，液晶显示面板设置于背光模组的出光面所在侧。
本申请液晶显示装置通过在多个LED的出光表面上形成扩散层，以使LED发出光线的分布角度增大，且使LED各方向发出的光线亮度更加均一化，实现LED从点光源向线光源转变，消除相邻两个LED之间的暗区，使进入到导光板中的光线为同一亮度的光，可有效降低由于LED与导光板之间错位以及反射片变形而产生的灯影以及LED光路，使背光模组发出亮度均一的光，从而提高液晶显示装置的显示品质。
以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (20)

  1. 一种背光模组，其中，所述背光模组包括：
    多个LED，每个所述LED具有一出光表面，每个所述LED的出光表面设置有扩散层。
  2. 根据权利要求1所述的背光模组，其中，所述扩散层包括透明胶黏剂和光扩散粒子。
  3. 根据权利要求2所述的背光模组，其中，所述光扩散粒子包括有机光扩散粒子和无机光扩散粒子。
  4. 根据权利要求3所述的背光模组，其中，所述透明胶黏剂的折射率与所述有机光扩散粒子的折射率的比值的取值范围为1.05-1.08。
  5. 根据权利要求3所述的背光模组，其中，所述透明胶黏剂的折射率与所述无机光扩散粒子的折射率的比值的取值范围为0.93-0.98。
  6. 根据权利要求3所述的背光模组，其中，所述有机光扩散粒子的数目多于所述无机光扩散粒子的数目。
  7. 根据权利要求3所述的背光模组，其中，所述透明胶黏剂选自环氧树脂以及有机硅中的至少一种。
  8. 根据权利要求3所述的背光模组，其中，所述有机光扩散粒子选自丙烯酸酯、有机硅以及聚乙烯中的至少一种，所述无机光扩散粒子选自硫酸钡、二氧化硅以及碳酸钙中的至少一种。
  9. 根据权利要求1所述的背光模组，其中，所述背光模组为侧入式背光模组。
  10. 根据权利要求1所述的背光模组，其中，所述扩散层包括第一扩散层和第二扩散层，所述第一扩散层设置于所述LED出光表面和所述第二扩散层之间，所述第一扩散层包括具有第一直径的第一光扩散粒子，所述第二扩散层包括具有第二直径的第二光扩散粒子，其中，所述第一直径大于所述第二直径，所述第一直径为所述第一光扩散粒子所对应的最小球体的直径，所述第二直径为所述第二光扩散粒子所对应的最小球体的直径。
  11. 一种液晶显示装置，其中，所述液晶显示装置包括背光模组，所述背光模组包括：
    多个LED，每个所述LED具有一出光表面，每个所述LED的出光表面设置有扩散层。
  12. 根据权利要求11所述的液晶显示装置，其中，所述扩散层包括透明胶黏剂和光扩散粒子。
  13. 根据权利要求12所述的液晶显示装置，其中，所述光扩散粒子包括有机光扩散粒子和无机光扩散粒子。
  14. 根据权利要求13所述的液晶显示装置，其中，所述透明胶黏剂的折射率与所述有机光扩散粒子的折射率的比值的取值范围为1.05- 1.08。
  15. 根据权利要求13所述的液晶显示装置，其中，所述透明胶黏剂的折射率与所述无机光扩散粒子的折射率的比值的取值范围为0.93-0.98。
  16. 根据权利要求13所述的液晶显示装置，其中，所述有机光扩散粒子的数目多于所述无机光扩散粒子的数目。
  17. 根据权利要求3所述的液晶显示装置，其中，所述透明胶黏剂选自环氧树脂以及有机硅中的至少一种。
  18. 根据权利要求13所述的液晶显示装置，其中，所述有机光扩散粒子选自丙烯酸酯、有机硅以及聚乙烯中的至少一种，所述无机光扩散粒子选自硫酸钡、二氧化硅以及碳酸钙中的至少一种。
  19. 根据权利要求11所述的液晶显示装置，其中，所述背光模组为侧入式背光模组。
  20. 根据权利要求11所述的液晶显示装置，其中，所述扩散层包括第一扩散层和第二扩散层，所述第一扩散层设置于所述LED出光表面和所述第二扩散层之间，所述第一扩散层包括具有第一直径的第一光扩散粒子，所述第二扩散层包括具有第二直径的第二光扩散粒子，其中，所述第一直径大于所述第二直径，所述第一直径为所述第一光扩散粒子所对应的最小球体的直径，所述第二直径为所述第二光扩散粒子所对应的最小球体的直径。
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