WO2019227795A1 - 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
WO2019227795A1
WO2019227795A1 PCT/CN2018/107449 CN2018107449W WO2019227795A1 WO 2019227795 A1 WO2019227795 A1 WO 2019227795A1 CN 2018107449 W CN2018107449 W CN 2018107449W WO 2019227795 A1 WO2019227795 A1 WO 2019227795A1
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WIPO (PCT)
Prior art keywords
light
fluorescent film
diffuse reflection
backlight module
primary color
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Ceased
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PCT/CN2018/107449
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English (en)
French (fr)
Inventor
张桂洋
查国伟
崔宏青
杨勇
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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 US16/215,630 priority Critical patent/US11054698B2/en
Publication of WO2019227795A1 publication Critical patent/WO2019227795A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02F1/133606—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 display, and in particular to a backlight module and a display device.
  • the light source is generally equipped with a film structure such as a diffusion film and a prism sheet (ie, brightness enhancement film, BEF) to improve the light efficiency and light mixing in a certain viewing angle range. Uniformity.
  • BEF brightness enhancement film
  • the backlight module still has the problem of uneven light mixing in the visible area, resulting in uneven brightness.
  • a display device with a backlight module displays a white screen of, for example, 255 gray levels, obvious bright and dark changes occur at different positions in the visible area, which seriously affects the overall display effect.
  • the present application provides a backlight module and a display device, which can help to improve the uniformity of light mixing and improve the uniformity of light brightness.
  • a backlight module includes a plurality of light sources, a fluorescent film, a first diffuse reflection layer located between the light source and the fluorescent film, and a first light reflecting layer located in a light emitting direction of the fluorescent film.
  • Two diffuse reflection layers the fluorescent film is located in the light emitting direction of the lamp source, the first diffuse reflection layer is only disposed directly above the light source, and the second diffuse reflection layer is located on the fluorescent film, Or embedded in the fluorescent film.
  • a backlight module includes a plurality of light sources, a fluorescent film, and at least one diffuse reflection layer, the fluorescent film is located in a light emitting direction of the light source, and at least one of the light source and the fluorescent film is The diffuse reflection layer is provided in a light emitting direction of.
  • the backlight module may further include a filter film, the filter film is located between the lamp source and the fluorescent film, the lamp source is configured to emit the first primary color light, and the fluorescent medium in the fluorescent film is When excited by the first primary color light, the second primary color light and the third primary color light are emitted, and the wavelengths of the second primary color light and the third primary color light are greater than the wavelength of the first primary color light, and the filter film allows the first primary color light to pass through The second primary color light and the third primary color light are reflected.
  • a filter film is located between the lamp source and the fluorescent film
  • the lamp source is configured to emit the first primary color light
  • the fluorescent medium in the fluorescent film is When excited by the first primary color light, the second primary color light and the third primary color light are emitted, and the wavelengths of the second primary color light and the third primary color light are greater than the wavelength of the first primary color light
  • the filter film allows the first primary color light to pass through The second primary color light and the third primary color light are reflected.
  • a backlight module includes a plurality of light sources, a fluorescent film, and at least one diffuse reflection layer.
  • the fluorescent film is located in a light emitting direction of the light source.
  • the diffuse reflection layer is provided in at least one of the light emitting directions.
  • the present application first designs a diffuse reflection layer in the light emitting direction of at least one of the light source and the fluorescent film, and the diffuse reflection layer provided above the light source diffusely reflects the pump light emitted by the light source, so that the light is compared. Uniformly enter the fluorescent film to improve the uniformity of the pump light.
  • the diffuse reflection layer provided above the fluorescent film scatters the light emitted from the fluorescent film and spreads and distributes the light to a larger range, which can help improve The uniformity of light mixing improves the uniformity of the light brightness.
  • the present application is designed to add a filter film between the light source and the fluorescent film.
  • the filter film allows the first primary color light with a short wavelength to pass, and the light with a longer reflection wavelength.
  • the second primary color light and the third primary color light can prevent the second primary color light and the third primary color light from being transmitted to the driving substrate and the reflective layer, and avoid being absorbed by the driving substrate and the reflective layer, thereby improving the light efficiency.
  • FIG. 1 is a schematic structural cross-sectional view of a backlight module according to a first embodiment of the present application
  • FIG. 2 is a schematic structural cross-sectional view of a backlight module according to a second embodiment of the present application
  • FIG. 3 is a schematic structural cross-sectional view of a backlight module according to a third embodiment of the present application.
  • FIG. 4 is a schematic structural cross-sectional view of a display device according to an embodiment of the present application.
  • the primary purpose of this application is to design a diffuse reflection layer in the light emitting direction of at least one of the light source and the fluorescent film, and the diffuse reflection layer located above the light source diffusely reflects the pump light emitted by the light source, so that the light is compared. Uniformly enter the fluorescent film to improve the uniformity of the pump light.
  • the diffuse reflection layer located above the fluorescent film scatters the light emitted from the fluorescent film and spreads and distributes the light to a larger range, which is conducive to improving the mixing Light uniformity, improving the uniformity of light brightness.
  • FIG. 1 is a schematic structural cross-sectional view of a backlight module according to a first embodiment of the present application.
  • the backlight module 10 includes a driving substrate 11 and various layer structures disposed on the driving substrate 11: a reflective layer 12, a plurality of light sources 13, a first diffuse reflection layer 14, a fluorescent film 15, and a second structure. Diffuse reflection layer 16.
  • the driving substrate 11 can be regarded as a back plate of the backlight module 10, and is not only used to support the above-mentioned structural elements of the backlight module 10, but also can be arranged to drive multiple light sources 13 to emit light.
  • the reflective layer 12 is disposed on the driving substrate 11, and an upper surface thereof can reflect light.
  • the plurality of light sources 13 are located on the same layer. Specifically, the plurality of light sources 13 may be disposed in the flat layer 131, and an upper surface of the flat layer 131 is a flat surface to facilitate the bonding of the filter film 18.
  • the plurality of light sources 13 are connected to a driving circuit and emit light of a predetermined color, such as blue light, under the driving of the driving circuit.
  • the light source 13 may be an LED, and the driving circuit may be a PCB (Printed Circuit Board) carried on the driving substrate 11.
  • the fluorescent film 15 is disposed in the light emitting direction of the light source 13.
  • the first diffuse reflection layer 14 and the second diffuse reflection layer 16 are located on the upper and lower sides of the fluorescent film 15, respectively.
  • the first diffuse reflection layer 14 is located on the light source 13.
  • the second diffuse reflection layer 16 is located in the light emitting direction of the fluorescent film 15.
  • the first diffuse reflection layer 14 may not be a full-surface structure, but may only cover a layer structure having a predetermined pattern directly above the light source 13.
  • the method for manufacturing the first diffuse reflection layer 14 in the present application includes, but is not limited to: First, a full-surface transparent dielectric layer is first formed, and the thickness of the transparent dielectric layer may be 0.3 ⁇ m to 5 ⁇ m, which includes PET (polyparaphenylene terephthalate). Ethylene formate), PCT (poly 1,4-cyclohexane dimethanol terephthalate), PMMA (polymethyl methacrylate), or SiO 2 (silicon dioxide), etc. can achieve diffuse reflection of light The particle size of the particles can be 0.1 ⁇ m to 1 ⁇ m.
  • the first diffuse reflection layer 14 is directly formed by using the same material as the first method by using a mask.
  • the fluorescent film 15 may be prepared by a thermal compression method in the present application. Since the material for preparing the fluorescent film 15 is in a molten state at a high temperature ( ⁇ 300 ° C.), the finally obtained fluorescent film 15 is in close contact with the first diffuse reflection layer 14. At this time, the first diffuse reflection layer 14 can be regarded as embedded in In the fluorescent film 15. Among them, the refractive indices of the first diffuse reflection layer 14 and the fluorescent film 15 are not the same, and the larger the difference in refractive index between the two is, the more obvious the diffuse reflection and scattering effects of the first diffuse reflection layer 14 are.
  • the second diffuse reflection layer 16 may be located on the fluorescent film 15, that is, the two are separate film structures. At this time, it is equivalent to setting a layer of air gap above the fluorescent film 15, so it is beneficial to reduce the graininess when the LED is used as the light source 13 while improving the uniformity of the backlight.
  • the second diffuse reflection layer 16 may be set in the fluorescent film 15 in the present application.
  • the second diffuse reflection layer 16 may be regarded as a part of the fluorescent film 15. The sum of the thicknesses of the two is equal to the fluorescent film 15. thickness of.
  • the manufacturing materials, thicknesses, and manufacturing methods of the second diffuse reflection layer 16 and the first diffuse reflection layer 14 may be the same, and will not be repeated here.
  • the second diffuse reflection layer 16 has a whole surface structure, which can facilitate uniform bonding of the upper film such as the diffusion film 17 and the prism sheet 18.
  • one light source 13 is provided corresponding to a plurality of vertex angles of the prism sheet 18, that is, a plurality of vertex angles of the prism sheet 18 are disposed above a working area of one light source 13.
  • the backlight module 10 of the present application also includes other structural elements, such as two layers of diffusion film 17 and one layer of prism sheet 18, wherein one layer of diffusion film 17 is disposed on fluorescent film 15, and prism sheet 18 is disposed on the layer to diffuse On the film 17, another layer of the diffusion film 17 is disposed on the prism sheet 18.
  • other structural elements such as two layers of diffusion film 17 and one layer of prism sheet 18, wherein one layer of diffusion film 17 is disposed on fluorescent film 15, and prism sheet 18 is disposed on the layer to diffuse On the film 17, another layer of the diffusion film 17 is disposed on the prism sheet 18.
  • the first diffuse reflection layer 14 diffusely reflects the light (can be called pump light) emitted from the light source 13 so that the light can enter the fluorescent film 15 more uniformly, thereby improving the uniformity of the pump light.
  • the second diffuse reflection layer 16 scatters the light emitted from the fluorescent film 15, scatters and distributes the light to a larger range, and further improves the uniformity of the backlight.
  • the second diffuse reflection layer 16 may also have a layer structure with a predetermined pattern instead of a whole-surface structure.
  • the second diffuse reflection layer 16 may be disposed only below the vertex angle of the prism sheet 18, that is, the second diffuse reflection layer 16 is disposed adjacent to the vertex angle bisector of the prism sheet 18.
  • the second diffuse reflection layer 16 may be disposed only directly above the light source 13.
  • the backlight module 10 may further be provided with a filter film 19, and the filter film 19 and the fluorescent film 15 are sequentially disposed in a light emitting direction of the light source 13.
  • the refractive index of the fluorescent film 15 may be 1.5 to 1.8, and the thickness may be 100 ⁇ m to 500 ⁇ m.
  • the fluorescent film 15 may be composed of a fluorescent medium (also called photoluminescent particles), haze particles, and an adhesive (such as silica gel). Mixed and formed, and by controlling the ratio of the fluorescent medium and the haze particles, the wavelength of light emitted from the fluorescent film 15 and the uniformity of mixed light can be fine-tuned.
  • the fluorescent medium emits light with a longer wavelength when excited by light with a shorter wavelength.
  • the fluorescent medium is The second primary color light and the third primary color light may be emitted during excitation, and the wavelengths of the second primary color light and the third primary color light are both larger than the wavelength of the first primary color light.
  • the filter film 19 is located between the light source 13 and the fluorescent film 15 and allows the first primary color light to pass through and reflects the second primary color light and the third primary color light.
  • Ta 2 O 5 penentoxide The tantalum (tantalum), TiO 2 (titanium dioxide), or other inorganic materials, or organic materials such as transparent resin are used to make the filter film 19, but of course it is not limited to this.
  • the present application may adopt appropriate methods, such as vacuum evaporation, deposition, magnetron sputtering, or thermocompression, to prepare the filter film 19.
  • the present application may apply Ta 2 O 5 or TiO 2 forms the filter film 19 by sputtering or evaporation, and the transparent resin is stacked to form the filter film 19 by thermocompression bonding.
  • the thickness of the filter film 19 may be 1 ⁇ m to 10 ⁇ m.
  • the filter film 19 blocks the second primary color light and the third primary color light from being transmitted toward the reflective layer 12, and only allows the two primary color lights to be transmitted toward the light emitting direction of the backlight module 10, thereby avoiding the two primary color lights. It is conducted to the driving substrate 11 and the reflective layer 12 to avoid being absorbed by the driving substrate 11 and the reflective layer 12, so that the light efficiency can be improved.
  • the light source 13 as a blue LED as an example
  • blue light conceived as the first primary color light
  • the fluorescent medium in the fluorescent film 15 is excited and emits red light (considered as the second primary color light) and Green light (think of it as the third primary color light)
  • red light and green light are transmitted only in the light emitting direction of the backlight module 10, and part of blue light is transmitted in the light emitting direction of the backlight module 10.
  • the other part can be conducted to the reflective layer 12 through the filter film 19.
  • the reflective layer 12 For the blue light transmitted to the reflective layer 12, a part of it is absorbed by the reflective layer 12 and the driving substrate 11, and the remaining part is reflected by the reflective layer 12 and continues to be transmitted to the fluorescent film 15, which continues to excite the fluorescent medium to emit red and green light, which is further beneficial Improve light efficiency.
  • the present application also provides a display device.
  • the display device 40 includes a backlight module 41 and a liquid crystal panel 42 disposed in a light emitting direction of the backlight module 41.
  • the backlight module 41 may be the backlight module 10 of any of the above embodiments.
  • the display device 40 also has the beneficial effects that the backlight module 10 can produce.

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

一种背光模组及显示装置，背光模组（10）包括多个灯源（13）、荧光膜（15）以及至少一漫反射层（14、16），荧光膜（15）位于灯源（13）的出光方向上，灯源（13）和荧光膜（15）中至少一者的出光方向上设有漫反射层（14、16），设置于灯源（13）上方的漫反射层（14）对灯源（13）发出的泵浦光进行漫反射，提高泵浦光的均匀性，设置于荧光膜（15）上方的漫反射层（16）对从荧光膜（15）出射的光进行散射，将光打散并分布到更大的范围，从而能够有利于提升混光均匀性，改善出光亮度的均匀性。

Description

背光模组及显示装置 【技术领域】
本申请涉及显示领域，具体涉及一种背光模组及显示装置。
【背景技术】
在主流的背光模组中，灯源的出光方向上一般搭载有扩散膜、棱镜片(即增亮片，Brightness Enhancement Film，BEF)等膜层结构，来提高一定视角范围内的光效和混光均匀性。但是，在实际使用过程中，背光模组仍会在可视区域内出现混光不均匀的问题，导致出光亮度不均匀。具有背光模组的显示装置在显示例如255灰阶的白画面时，可视区的不同位置会出现明显的亮暗变化，严重影响整体显示效果。
【发明内容】
有鉴于此，本申请提供一种背光模组及显示装置，能够有利于提升混光均匀性，改善出光亮度的均匀性。
本申请一实施例的背光模组，包括多个灯源、荧光膜、位于所述灯源和所述荧光膜之间的第一漫反射层、以及位于所述荧光膜的出光方向上的第二漫反射层，所述荧光膜位于所述灯源的出光方向上，所述第一漫反射层仅设置于所述光源的正上方，所述第二漫反射层位于所述荧光膜上，或者镶嵌于所述荧光膜中。
本申请一实施例的背光模组，包括多个灯源、荧光膜以及至少一漫反射层，所述荧光膜位于所述灯源的出光方向上，所述灯源和荧光膜中至少一者的出光方向上设有所述漫反射层。
进一步地，所述背光模组还可以包括滤光膜，所述滤光膜位于灯源和荧光膜之间，所述灯源用于发出第一原色光，所述荧光膜中的荧光介质在被第一原色光激发时发出第二原色光和第三原色光，且所述第二原色光和第三原色光的波长均大于第一原色光的波长，所述滤光膜允许第一原色光通过而反射第二原色光和第三原色光。
本申请一实施例的显示装置，其背光模组包括多个灯源、荧光膜以及至少一漫反射层，所述荧光膜位于所述灯源的出光方向上，所述灯源和荧光膜中至少一者的出光方向上设有所述漫反射层。
有益效果：本申请首先设计灯源和荧光膜中至少一者的出光方向上设有漫反射层，设置于灯源上方的漫反射层对灯源发出的泵浦光进行漫反射，使得光线比较均匀的进入荧光膜，提高泵浦光的均匀性，设置于荧光膜上方的漫反射层对从荧光膜出射的光进行散射，将光打散并分布到更大的范围，从而能够有利于提升混光均匀性，改善出光亮度的均匀性，其次本申请设计在灯源和荧光膜之间增加滤光膜，该滤光膜允许波长较短的第一原色光通过，而反射波长较长的第二原色光和第三原色光，以此避免第二原色光和第三原色光被传导至驱动基板和反射层，避免被驱动基板和反射层吸收，从而能够提升光效。
【附图说明】
图1是本申请第一实施例的背光模组的结构剖面示意图；
图2是本申请第二实施例的背光模组的结构剖面示意图；
图3是本申请第三实施例的背光模组的结构剖面示意图；
图4是本申请一实施例的显示装置的结构剖面示意图。
【具体实施方式】
本申请的首要目的是：设计灯源和荧光膜中至少一者的出光方向上设有漫反射层，位于灯源上方的漫反射层对灯源发出的泵浦光进行漫反射，使得光线比较均匀的进入荧光膜，提高泵浦光的均匀性，位于荧光膜上方的漫反射层对从荧光膜出射的光进行散射，将光打散并分布到更大的范围，以此有利于提升混光均匀性，改善出光亮度的均匀性。
下面结合附图对本申请的各个实施例的技术方案进行清楚、完整地描述。在不冲突的情况下，下述实施例及其技术特征可以相互组合。并且，全文所采用的方向性术语，例如“上”、“下”等，均是为了更好的描述各个实施例，并非用于限制本申请的保护范围。
图1是本申请第一实施例的背光模组的结构剖面示意图。请参阅图1，所述背光模组10包括驱动基板11以及设置于该驱动基板11的各层结构：反射层12、 多个灯源13、第一漫反射层14、荧光膜15以及第二漫反射层16。
驱动基板11可视为背光模组10的背板，不仅用于承托背光模组10的上述结构元件，还可以排布驱动多个灯源13发光的走线。
反射层12设置于驱动基板11上，且其上表面能够反射光。
多个灯源13位于同一层，具体地，多个灯源13可以设置于平坦层131中，平坦层131的上表面为平面，以有利于滤光膜18的贴合。所述多个灯源13与驱动电路连接，并在驱动电路的驱动下发出预定颜色的光，例如蓝光。该灯源13可以为LED，驱动电路可以为承载于驱动基板11的PCB(Printed Circuit Board，印刷电路板)。
荧光膜15设置于灯源13的出光方向上，第一漫反射层14和第二漫反射层16分别位于荧光膜15的上下两侧，其中，所述第一漫反射层14位于灯源13的出光方向上，而第二漫反射层16位于荧光膜15的出光方向上。
第一漫反射层14可以并非为一整面结构，而是仅覆盖光源13正上方的具有预定图案的层结构。本申请制造所述第一漫反射层14的方式包括但不限于：一，首先形成一整面透明介质层，该透明介质层的厚度可以为0.3μm～5μm，其中包含PET(聚对苯二甲酸乙二酯)、PCT(聚对苯二甲酸1，4-环己烷二甲醇酯)、PMMA(聚甲基丙烯酸甲酯)、或者SiO 2(二氧化硅)等能够对光实现漫反射的颗粒，该颗粒的粒径可以为0.1μm～1μm，接着利用刻蚀方式仅保留该透明介质层的位于光源13正上方的部分，其余部分予以去除，透明介质层的剩余部分即为第一漫反射层14。二，采用与第一种方式相同的材料，利用掩膜板直接形成第一漫反射层14。
在第一漫反射层14制备完成后，本申请可以通过热压合方式制备所述荧光膜15。由于制备荧光膜15的材料在高温(＜300℃)下为熔融状态，因此最终制得的荧光膜15与第一漫反射层14紧密接触，此时第一漫反射层14可视为镶嵌于荧光膜15中。其中，第一漫反射层14与荧光膜15的折射率不相同，并且两者的折射率差异越大，第一漫反射层14的漫反射及散射效果越明显。
请继续参阅图1，第二漫反射层16可以位于所述荧光膜15上，即两者为单独的膜层结构。此时，相当于在荧光膜15上方设置了一层空气间隙，因此在提高背光均匀性的同时有利于降低LED作为灯源13时的颗粒感。当然，本申请也可以设置所述第二漫反射层16镶嵌在荧光膜15中，于此，第二漫反射层16可视为荧光膜15的一部分，两者的厚度之和等于荧光膜15的厚度。在本申请 中，第二漫反射层16和第一漫反射层14的制造材料、厚度及制造方式可以相同，此处不再予以赘述。不同的是，如图1所示，第二漫反射层16为一整面结构，能够有利于扩散膜17、棱镜片18等上层膜片的均匀贴合。其中，一个灯源13与棱镜片18的多个顶角对应设置，也就是说，一个灯源13的工作区域上方设置有棱镜片18的多个顶角。
应理解，本申请的背光模组10还包括其他结构元件，例如两层扩散膜17和一层棱镜片18，其中一层扩散膜17设置于荧光膜15上，棱镜片18设置于该层扩散膜17上，另一层扩散膜17设置于棱镜片18上，这些结构元件的设置方式和工作原理可参阅现有技术。
在本实施例中，第一漫反射层14对灯源13发出的光(可称泵浦光)进行漫反射，使得光线能够比较均匀的进入荧光膜15，提高泵浦光的均匀性，第二漫反射层16对从荧光膜15出射的光进行散射，将光打散并分布到更大的范围，进一步提高背光的均匀性。
基于该工作原理，在本申请的其他实施例中，第二漫反射层16也可以为具有预定图案的层结构，而非一整面结构。例如，如图2所示，第二漫反射层16可以仅设置于棱镜片18的顶角的下方，即，第二漫反射层16邻近棱镜片18的顶角平分线设置。又例如，如图3所示，第二漫反射层16也可以仅设置于灯源13的正上方。
请继续参阅图1，所述背光模组10还可以设置有滤光膜19，该滤光膜19和荧光膜15依次设置于灯源13的出光方向上。其中，荧光膜15的折射率可以为1.5～1.8，厚度可以为100μm～500μm，该荧光膜15可以由荧光介质(又称光致发光粒子)、雾度粒子和粘合胶(例如硅胶)等混合形成，并且，通过控制荧光介质和雾度粒子的比例可以微调荧光膜15出射光的波长和混光均匀性。所述荧光介质在被波长较短的光激发时会发出波长较长的光，具体地，若将灯源13发出的光视为第一原色光，则荧光介质在被所述第一原色光激发时可以发出第二原色光和第三原色光，该第二原色光和第三原色光的波长均大于第一原色光的波长。所述滤光膜19位于灯源13和荧光膜15之间，其允许第一原色光通过而反射第二原色光和第三原色光，为实现此，本申请可采用Ta 2O 5(五氧化二钽)或者TiO 2(二氧化钛)等无机材料，或者采用透明树脂等有机材料来制得该滤光膜19，当然并不限于此。另外，根据材料的不同，本申请可采用适当方式，例如真空蒸镀、沉积、磁控溅射或者热压合等方式来制备滤光膜19，具体 地，本申请可以对Ta 2O 5或者TiO 2通过溅射或蒸镀方式形成滤光膜19，而对透明树脂采用热压合方式堆叠形成滤光膜19。该滤光膜19的厚度可以为1μm～10μm。
在背光模组10的工作过程中，滤光膜19阻挡第二原色光和第三原色光朝向反射层12传导，仅允许两原色光朝向背光模组10的出光方向传导，以此避免两原色光被传导至驱动基板11和反射层12，避免被驱动基板11和反射层12吸收，从而能够提升光效。
以灯源13为蓝光LED为例，蓝光(可视为第一原色光)传导至荧光膜15时，荧光膜15中的荧光介质被激发并发出红光(可视为第二原色光)和绿光(可视为第三原色光)，在滤光膜19的反射下，红光和绿光仅朝向背光模组10的出光方向传导，而蓝光的一部分朝向背光模组10的出光方向传导，另一部分可以通过滤光膜19传导至反射层12。对于传导至反射层12的蓝光，其中一部分被反射层12和驱动基板11吸收，剩余部分被反射层12反射并继续传导至荧光膜15，继续激发荧光介质发出红光和绿光，进一步有利于提升光效。
本申请还提供一种显示装置。如图4所示，所述显示装置40包括背光模组41以及设置于背光模组41的出光方向上的液晶面板42。该背光模组41可以为上述任一实施例的背光模组10。于此，所述显示装置40也具有背光模组10所能产生的有益效果。
再次说明，以上所述仅为本申请的实施例，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，例如各实施例之间技术特征的相互结合，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。

Claims (20)

  1. 一种背光模组，其中，所述背光模组包括多个灯源、荧光膜、位于所述灯源和所述荧光膜之间的第一漫反射层、以及位于所述荧光膜的出光方向上的第二漫反射层，所述荧光膜位于所述灯源的出光方向上，所述第一漫反射层仅设置于所述光源的正上方，所述第二漫反射层位于所述荧光膜上，或者镶嵌于所述荧光膜中。
  2. 根据权利要求1所述的背光模组，其中，所述荧光膜采用热压合方式形成于所述第一漫反射层上。
  3. 根据权利要求1所述的背光模组，其中，所述背光模组还包括位于所述荧光膜的出光方向上的棱镜片，所述第二漫反射层设置于所述棱镜片的顶角的下方。
  4. 根据权利要求1所述的背光模组，其中，所述第二漫反射层仅设置于所述灯源的正上方其中，或者，所述第二漫反射层为设置于所述荧光膜的出光方向上的一整面结构。
  5. 根据权利要求1所述的背光模组，其中，所述背光模组还包括滤光膜，所述滤光膜位于所述灯源和荧光膜之间，所述灯源用于发出第一原色光，所述荧光膜中的荧光介质在被所述第一原色光激发时发出第二原色光和第三原色光，且所述第二原色光和第三原色光的波长均大于所述第一原色光的波长，所述滤光膜允许所述第一原色光通过而反射所述第二原色光和第三原色光其中。
  6. 一种背光模组，其中，所述背光模组包括多个灯源、荧光膜以及至少一漫反射层，所述荧光膜位于所述灯源的出光方向上，所述灯源和荧光膜中至少一者的出光方向上设有所述漫反射层。
  7. 根据权利要求6所述的背光模组，其中，所述背光模组包括位于所述灯源和所述荧光膜之间的第一漫反射层，所述第一漫反射层仅设置于所述光源的正上方。
  8. 根据权利要求7所述的背光模组，其中，所述荧光膜采用热压合方式形成于所述第一漫反射层上。
  9. 根据权利要求6所述的背光模组，其中，所述背光模组包括位于所述荧光膜的出光方向上的第二漫反射层，所述第二漫反射层位于所述荧光膜上，或者镶嵌于所述荧光膜中。
  10. 根据权利要求9所述的背光模组，其中，所述背光模组还包括位于所述荧光膜的出光方向上的棱镜片，所述第二漫反射层设置于所述棱镜片的顶角的下方。
  11. 根据权利要求9所述的背光模组，其中，所述第二漫反射层仅设置于所述灯源的正上方。
  12. 根据权利要求9所述的背光模组，其中，所述第二漫反射层为设置于所述荧光膜的出光方向上的一整面结构。
  13. 根据权利要求6所述的背光模组，其中，所述背光模组还包括滤光膜，所述滤光膜位于所述灯源和荧光膜之间，所述灯源用于发出第一原色光，所述荧光膜中的荧光介质在被所述第一原色光激发时发出第二原色光和第三原色光，且所述第二原色光和第三原色光的波长均大于所述第一原色光的波长，所述滤光膜允许所述第一原色光通过而反射所述第二原色光和第三原色光。
  14. 根据权利要求12所述的背光模组，其中，所述滤光膜的制造材料包括五氧化二钽Ta 2O 5、二氧化钛TiO 2、透明树脂中的一者。
  15. 一种显示装置，其中，所述显示装置包括背光模组，所述背光模组包括多个灯源、荧光膜以及至少一漫反射层，所述荧光膜位于所述灯源的出光方向上，所述灯源和荧光膜中至少一者的出光方向上设有所述漫反射层。
  16. 根据权利要求15所述的显示装置，其中，所述背光模组包括位于所述灯源和所述荧光膜之间的第一漫反射层，所述第一漫反射层仅设置于所述光源的正上方。
  17. 根据权利要求15所述的显示装置，其中，所述背光模组包括位于所述荧光膜的出光方向上的第二漫反射层，所述第二漫反射层位于所述荧光膜上，或者镶嵌于所述荧光膜中。
  18. 根据权利要求17所述的显示装置，其中，所述背光模组还包括位于所述荧光膜的出光方向上的棱镜片，所述第二漫反射层设置于所述棱镜片的顶角的下方。
  19. 根据权利要求17所述的显示装置，其中，所述第二漫反射层仅设置于所述灯源的正上方，或者，所述第二漫反射层为设置于所述荧光膜的出光方向上的一整面结构。
  20. 根据权利要求15所述的显示装置，其中，所述背光模组还包括滤光膜，所述滤光膜位于所述灯源和荧光膜之间，所述灯源用于发出第一原色光，所述 荧光膜中的荧光介质在被所述第一原色光激发时发出第二原色光和第三原色光，且所述第二原色光和第三原色光的波长均大于所述第一原色光的波长，所述滤光膜允许所述第一原色光通过而反射所述第二原色光和第三原色光。
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