CN109633792B - Composite film capable of reducing blue light hazard, preparation process and backlight module - Google Patents

Composite film capable of reducing blue light hazard, preparation process and backlight module Download PDF

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CN109633792B
CN109633792B CN201811550367.5A CN201811550367A CN109633792B CN 109633792 B CN109633792 B CN 109633792B CN 201811550367 A CN201811550367 A CN 201811550367A CN 109633792 B CN109633792 B CN 109633792B
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base layer
light
layer
upper base
composite film
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CN109633792A (en
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曾照明
邱登明
谢超英
苏凤宜
姚述光
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APT Electronics Co Ltd
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APT Electronics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
    • G02B1/005—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of photonic crystals or photonic band gap materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/69—Details of refractors forming part of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • F21V5/005—Refractors for light sources using microoptical elements for redirecting or diffusing light using microprisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer

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

Abstract

The invention discloses a composite film capable of reducing blue light hazard, which comprises an upper base layer, a lower base layer and a microcrystalline structure layer formed by photonic crystals and arranged between the upper base layer and the lower base layer, wherein the microcrystalline structure layer can transmit light with the wavelength of more than 450nm and can reflect part or all of the light with the wavelength of less than 450 nm. The preparation process of the composite film is also disclosed, and comprises the following steps: preparing a microcrystalline structure layer: preparing an upper base layer and a lower base layer respectively: and superposing the upper base layer, the microcrystalline structure layer and the lower base layer into a whole, wherein the microcrystalline structure layer is positioned between the upper base layer and the lower base layer, and the light enhancement structure is positioned on the surface layer. Also disclosed is a backlight module comprising the composite film. The composite film disclosed by the invention has a simple structure, can accurately block blue light of a wave band below 450nm, and can not cause color cast.

Description

Composite film capable of reducing blue light hazard, preparation process and backlight module
Technical Field
The invention belongs to the technical field of LEDs, and particularly relates to a composite film capable of reducing blue light hazard, a preparation process and a backlight module.
Background
Medical research reports indicate that the destruction of the retina by violet and blue light in the visible light is greatest. Visible light with a wavelength between 500 and 800nm has substantially no damaging effect on the retina, while violet and blue light with a wavelength between 400 and 500nm, with shorter wavelengths, increased photon energy, and a rapid increase in the extent of damage to the retina. In the past, the mechanism of how blue light damages the retina was not known enough, nor has it been appreciated by the eye. Scientists have begun to recognize in the last two or three years that retinal cells contain an abnormal retinoid called A2E. The A2E is toxic to retinal pigment epithelium in the absence of light darkness, whereas the A2E toxicity is greatly increased in the presence of light. A2E has two absorption peaks: a wavelength of 335nm in the ultraviolet region; and the other at 435nm in the blue region. The damaging effect of blue light on the retina is a chain reaction: firstly, because the absorption peaks are arranged in the ultraviolet region and the blue light region, the ultraviolet light or the blue light can excite the A2E to release free radical ions; the radical particles further increase the damage of A2E to the retinal pigment epithelium, thereby causing atrophy of the retinal pigment epithelium and further leading to death of the photosensitive cells. The function of the photosensitive cells is to receive incident light and convert optical signals into electric signals, and then the electric signals are transmitted to the brain through vision nerves for imaging. Thus, death of the light-sensitive cells will directly result in a gradual decrease or even complete loss of vision.
The optical principle of the blue light prevention technology is relatively simple, and high-energy short-wave blue light is reflected out mainly through the blocking of special materials, so that the aim of protecting eyes from being damaged by the blue light is fulfilled. The real difficulty is that: the blue light wave band is UV400-500, and the high-energy short-wave blue light of the wave band below 450nm is the biggest to eyes, so how to accurately block the high-energy short-wave blue light of the wave band below 450nm of blue light is mainly considered, and meanwhile, the chromatic aberration is controlled, and the light transmittance is increased.
Currently, in the technical field of LEDs, the following blue light protection scheme is mainly adopted, where:
1, the Ming-base software filters blue, the eye protection effect is really obvious, but the color cast is yellow.
2, the hardware of the Guangdong ABL product filters blue, and the eye protection effect, namely the blue light filtering effect is poor although the problem of yellow and color cast is solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides the composite film capable of reducing the damage of blue light, which has a simple structure, can accurately and effectively block blue light of a wave band below 450nm, reduces the damage of blue light of a high-energy wave band to human eyes, and does not cause color cast.
The invention adopts the following technical scheme:
the utility model provides a can reduce complex film of blue light harm, includes basic unit, lower basic unit, locates the microcrystalline structure layer that constitutes by photonic crystal between basic unit and the lower basic unit, microcrystalline structure layer can the transmission wavelength be above 450nm light, can be with the light partial or total reflection return of wavelength below 450nm simultaneously.
Further, the lower base layer is made of one or a combination of polymethyl methacrylate, polycarbonate, polystyrene and styrene-methyl methacrylate copolymer;
the upper base layer is made of one or a combination of polymethyl methacrylate, polycarbonate, polystyrene and styrene-methyl methacrylate copolymer.
Furthermore, the surface layer of the upper base layer is provided with a light enhancement structure, and the light enhancement structure is a conical microstructure uniformly distributed on the surface of the upper base layer.
Further, the microstructure is produced by rolling a roller press on the upper substrate surface.
Further, the thickness of the upper base layer is 100-200 um;
the thickness of the lower base layer is 100-200 um.
Further, the refractive index of the upper base layer is 1.41-1.6;
the refractive index of the lower base layer is 1.41-1.6.
The invention also provides a preparation process of the composite film, which comprises the following steps:
preparing a microcrystalline structure layer: the photonic crystals are orderly arranged and then are solidified and formed, and the thickness of the microcrystalline structure layer is 200-500 um;
preparing an upper base layer and a lower base layer respectively: preparing an upper base layer and a lower base layer respectively by using one of polymethyl methacrylate, polycarbonate, polystyrene and styrene-methyl methacrylate copolymer or a combination material thereof; the surface layer of the upper base layer is provided with a light enhancement structure, and the light enhancement structure is a conical microstructure uniformly distributed on the surface of the upper base layer;
and superposing the upper base layer, the microcrystalline structure layer and the lower base layer into a whole, wherein the microcrystalline structure layer is positioned between the upper base layer and the lower base layer, and the light enhancement structure is positioned on the surface layer.
The invention also provides a backlight module, which comprises the composite film.
Further, the LED lamp further comprises a white light conversion film, a diffusion plate, a back plate and a PCB board, wherein the PCB board is provided with a light emitting module and a lens, and the composite film, the white light conversion film, the diffusion plate, the back plate and the PCB board are sequentially overlapped in parallel from top to bottom.
Further, the LED display device also comprises a light emitting module, a light guide plate and a white light conversion film which is arranged between the light guide plate and the composite film in parallel, wherein the light emitting module is positioned at one side of the light guide plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the composite film is characterized in that a microcrystalline structure layer prepared from photonic crystals is arranged between an upper base layer and a lower base layer, and the microcrystalline structure layer can transmit light rays with the wavelength of 500-700nm at all angles. When the angle range of the crystal grains is 25-75 degrees, the crystal grains can transmit blue/purple light with the wavelength of more than 450 nm; when the angle of the crystal grains is not in the range of 25-75 degrees, blue/purple light with the wavelength of 400-500 nm can be reflected back to the fluorescent conversion layer. That is, the microcrystalline structure layer can selectively absorb blue/violet light with the wavelength in the range of 400-500 nm, and can realize that only blue light with the wavelength below 450nm and most harmful to human eyes is totally reflected, and normal wavelength light with the wavelength above 450nm and color requirements is not affected. The method not only realizes the accurate blocking of the high-energy short-wave blue light with the wave band below 450nm, but also can lighten the color shift and yellow shift phenomenon, control the color difference of the composite film after the filtering, and increase the light transmittance.
2. The composite film prepared by the preparation process can realize accurate blocking of the high-energy short-wave blue light with the wave band below 450nm, can reduce the phenomenon of color cast and yellow cast, controls the color difference of the composite film after filtering, and increases the light transmittance.
3. According to the backlight module, the composite film is adopted, so that the backlight module can fully transmit light with the wavelength of more than 500nm, blue/purple light with the wavelength of less than 450nm can be reflected back to the fluorescent conversion layer of the backlight module, the reflected light further increases excitation of fluorescent powder in the fluorescent conversion layer, the light emitting efficiency of the fluorescent conversion layer is greatly improved, the problem of color cast and yellowing of the backlight module is reduced while accurate filtering of high-energy blue light with the wavelength of less than 450nm is realized, and the light transmittance of the backlight module is increased.
Drawings
The technology of the present invention will be described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic structural view of a composite membrane according to the present invention;
FIG. 2 is a graph comparing spectra of composite films according to the present invention.
Fig. 3 is a schematic diagram of a backlight module in embodiment 1;
fig. 4 is a schematic structural diagram of a backlight module in embodiment 2.
Marking:
100-a composite membrane; 101-a lower base layer; 102-a microcrystalline structure layer; 103-upper base layer; 104-a light enhancement structure;
201—a white light conversion film; 202-a diffusion plate; 203-a back plate; 204—a PCB board; 205-a lens; 206-blue LED; 301-white light conversion film; 302—a light guide plate; 303-a light emitting module.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
The invention discloses a composite film 100 capable of reducing blue light hazard, which comprises an upper base layer 103, a lower base layer 101 and a microcrystalline structure layer 102 which is arranged between the upper base layer 103 and the lower base layer 101 and is formed by orderly arranging photonic crystals, wherein the microcrystalline structure layer 102 can transmit light with the wavelength of more than 450nm and can reflect part or all of the light with the wavelength of less than 450 nm. Wherein, ordered arrangement means that crystals are arranged in the same orientation and angle. In the same microstructure layer, the photonic crystal shape, size, and arrangement pitch all tend to be the same. In practical production and use, microcrystalline structure layers formed by photonic crystals with different sizes and arrangement pitches can be selected according to the light filtering requirement.
Generally, the greater the thickness of the microcrystalline structure layer 102, the better its barrier to blue light and the better its production processability. In this embodiment, the thickness of the microcrystalline structure layer 102 is about 200-500 um, based on the total thickness of the composite film. The thickness of the microcrystalline structure is determined by the overall thickness requirements of the composite film 100. The total thickness of the composite film 100 is generally about 0.5mm to 1 mm;
the photonic crystal constituting the microcrystalline structure layer 102 is capable of transmitting light rays with a wavelength of 500-700nm at all angles. When the angle range of the crystal grains is 25-75 degrees, the crystal grains can transmit blue/purple light with the wavelength of more than 450 nm; when the angle of the crystal grains is not in the range of 25-75 degrees, blue/purple light with the wavelength of 400-500 nm can be reflected back to the fluorescent conversion layer. That is, the microcrystalline structure layer 102 can selectively absorb blue/violet light in the wavelength band of 400-500 nm, which can realize total reflection of only blue light in the wavelength band below 450nm, which is most harmful to human eyes, without affecting normal wavelength light with the wavelength above 450nm for color requirements. The method not only realizes the accurate blocking of the high-energy short-wave blue light with the wave band below 450nm, but also can lighten the color shift and yellow shift phenomenon, control the color difference of the composite film 100 after the filtering, and increase the light transmittance.
Specifically, the material used for the lower base layer 101 is one of polymethyl methacrylate, polycarbonate, polystyrene, styrene-methyl methacrylate copolymer or a combination thereof; the thickness of the lower base layer 101 is 100-200 um, preferably 100um; the refractive index of the lower base layer 101 is 1.41 to 1.6, preferably 1.41.
The upper base layer 103 is made of one or a combination of polymethyl methacrylate, polycarbonate, polystyrene, and styrene-methyl methacrylate copolymer. The thickness of the upper base layer 103 is 100-200 um; the upper base layer 103 has a refractive index of 1.41 to 1.6, preferably 1.41;
in order to further increase the light transmittance of the composite film 100, the surface layer of the upper base layer 103 is further provided with a light enhancing structure 104, wherein the light enhancing structure 104 is a microstructure uniformly distributed on the surface of the upper base layer 103, and the microstructure is generally cone-shaped. The microstructure is produced by rolling a roller press on the surface of the upper base layer 103. Wherein, the uniform distribution means that the shape, size and angle of the microstructure tend to be uniform, and the size of the microstructure is generally in the order of um. In practical use, microstructures with different shapes, sizes and angles can be selected according to the brightness enhancement requirement.
The invention also discloses a preparation process of the composite film 100 capable of reducing blue light hazard, which is used for preparing the composite film 100 and comprises the following steps:
preparing a microcrystalline structure layer 102: the photonic crystals are orderly arranged and then are solidified and formed, and the thickness of the microcrystalline structure layer 102 is 200-500 um;
the upper base layer 103 and the lower base layer 101 are prepared separately: preparing upper and lower base layers 103 and 101 respectively using one of polymethyl methacrylate, polycarbonate, polystyrene, styrene-methyl methacrylate copolymer or a combination thereof; wherein, the surface layer of the upper base layer 103 is provided with a light enhancement structure 104, and the light enhancement structure 104 is a cone-shaped microstructure uniformly distributed on the surface of the upper base layer 103; the microstructure is produced by rolling a roller on the surface of the upper base layer 103.
The prepared upper base layer 103, the microcrystalline structure layer 102 and the lower base layer 101 are overlapped into a whole, wherein the microcrystalline structure layer 102 is positioned between the upper base layer 103 and the lower base layer 101, and the light enhancement structure 104 is positioned on the surface layer.
The invention also discloses a backlight module capable of reducing blue light hazard, which comprises the composite film 100. By adopting the composite film 100, the backlight module can fully transmit light with the wavelength of more than 500nm, and simultaneously can reflect blue/violet light with the wavelength of less than 450nm back to the fluorescent conversion layer of the backlight module, and the reflected light further increases the excitation of fluorescent powder in the fluorescent conversion layer, so that the light-emitting efficiency of the fluorescent conversion layer is greatly improved.
Example 1
The backlight module of this embodiment adopts a direct-type LED backlight module structure, as shown in fig. 3, the direct-type LED backlight module includes the above-mentioned composite film 100, and further includes a white light conversion film 201, a diffusion plate 202, a back plate 203 and a PCB 204, wherein the PCB 204 is provided with a light emitting module and a lens 205, and the composite film 100, the white light conversion film 201, the diffusion plate 202, the back plate 203 and the PCB 204 are sequentially stacked in parallel from top to bottom.
Specifically, the lower surface of the composite film 100 is connected to the diffusion plate 202 through the white light conversion film 201; the diffusion plate 202 is disposed on the upper surface of the back plate 203, the PCB 204 is disposed on the lower surface of the back plate 203, and the lower surface of the PCB 204 is provided with a lens 205 and a light emitting module, so that the blue light source is amplified by the lens to uniformly distribute the blue light on the diffusion plate 202. The light emitting module includes a blue LED206, and the white light conversion die 201 may be a blue excited fluorescent film or a quantum film.
Example 2
In this embodiment, the backlight module adopts an LED side-entry backlight module structure, as shown in fig. 4, and the LED side-entry backlight module includes the above-mentioned compound die 100, a light emitting module 303, a light guide plate 302, and a white light conversion film 301 disposed in parallel between the light guide plate 302 and the compound film 100, where the light emitting module 303 is located at one side of the light guide plate 302.
The light emitting module 303 includes a blue LED and a PCB board for mounting the blue LED, so that the blue LED and the PCB board are connected into a whole and then mounted on one side of the light guide plate 302. The white light conversion film 301 disposed on the upper surface of the light guide plate may be a fluorescent film or a quantum film excited by blue light, the blue light emitted by the light emitting module 303 passes through the light guide plate 302 and then totally reflects through its dots, the blue light is guided out from the surface of the light guide plate, converted into white light by the white light conversion film 301, and then reflected back by the composite film 100, thereby preventing the low-wavelength harmful blue light from being emitted.
In the present invention, the directions, such as up, down, left and right, are shown by reference to the drawings.
The composite film capable of reducing blue light hazard, the preparation process and other contents of the backlight module are referred to in the prior art, and are not described herein.
The present invention is not limited to the preferred embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present invention are within the scope of the technical proposal of the present invention.

Claims (5)

1. A composite film capable of reducing blue light hazard, characterized in that: the light source comprises an upper base layer, a lower base layer and a microcrystalline structure layer which is arranged between the upper base layer and the lower base layer and is formed by orderly arranging photonic crystals, wherein the microcrystalline structure layer can transmit light with the wavelength of more than 450nm and can reflect part or all of the light with the wavelength of less than 450 nm;
the surface layer of the upper base layer is provided with a light enhancement structure, and the light enhancement structure is a conical microstructure uniformly distributed on the surface of the upper base layer;
the microstructure is manufactured by rolling on the surface of the upper base layer through a roller press;
the thickness of the upper base layer is 100-200 um;
the thickness of the lower base layer is 100-200 um;
the thickness of the microcrystalline structure layer is 200-500 um;
when the incidence angle of the crystal grains of the microcrystalline structure layer is 25-75 degrees, the microcrystalline structure layer can transmit blue light and purple light with the wavelength of more than 450 nm.
2. The blue light hazard reducing composite film according to claim 1, wherein: the lower base layer is made of one or a combination of polymethyl methacrylate, polycarbonate, polystyrene and styrene-methyl methacrylate copolymer;
the upper base layer is made of one or a combination of polymethyl methacrylate, polycarbonate, polystyrene and styrene-methyl methacrylate copolymer.
3. The blue light hazard reducing composite film according to claim 1, wherein:
the refractive index of the upper base layer is 1.41-1.6;
the refractive index of the lower base layer is 1.41-1.6.
4. A process for preparing a composite film capable of reducing blue light hazard according to any one of claims 1 to 3, comprising the steps of:
preparing a microcrystalline structure layer: curing and forming after orderly arrangement by utilizing photonic crystals;
preparing an upper base layer and a lower base layer respectively: preparing an upper base layer and a lower base layer respectively by using polymethyl methacrylate, polycarbonate, polystyrene, and one of styrene-methyl methacrylate copolymer or a combination material thereof; the surface layer of the upper base layer is provided with a light enhancement structure, and the light enhancement structure is a conical microstructure uniformly distributed on the surface of the upper base layer; the microstructure is manufactured by rolling on the surface of the upper base layer through a roller press;
and superposing the upper base layer, the microcrystalline structure layer and the lower base layer into a whole, wherein the microcrystalline structure layer is positioned between the upper base layer and the lower base layer, and the light enhancement structure is positioned on the surface layer.
5. A backlight module capable of reducing blue light hazard is characterized in that: a composite film comprising the blue light hazard reducing composition of any one of claims 1 to 3;
the LED lamp further comprises a white light conversion film, a diffusion plate, a back plate and a PCB board, wherein the PCB board is provided with a light emitting module and a lens, and the composite film, the white light conversion film, the diffusion plate, the back plate and the PCB board are sequentially overlapped in parallel from top to bottom;
or the light emitting module is positioned at one side of the light guide plate, and the white light conversion film is arranged between the light guide plate and the composite film in parallel.
CN201811550367.5A 2018-12-18 2018-12-18 Composite film capable of reducing blue light hazard, preparation process and backlight module Active CN109633792B (en)

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