CN219201971U - Optical diffusion composite film and backlight module - Google Patents
Optical diffusion composite film and backlight module Download PDFInfo
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- CN219201971U CN219201971U CN202223535514.6U CN202223535514U CN219201971U CN 219201971 U CN219201971 U CN 219201971U CN 202223535514 U CN202223535514 U CN 202223535514U CN 219201971 U CN219201971 U CN 219201971U
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Abstract
The application provides an optical diffusion composite film, including first structural layer with set up in the second structural layer of the relative both sides of first structural layer, the both surfaces on first structural layer are equipped with a plurality of diffusion grooves respectively, the second structural layer deviate from the surface on first structural layer is equipped with the prism structural layer. By arranging the diffusion grooves and the prism structure layer to replace diffusion particles in the traditional technology, the optical diffusion composite film has higher brightness and light homogenizing effect. In addition, the application also provides a backlight module.
Description
Technical Field
The application relates to the field of display, in particular to an optical diffusion composite film and a backlight module.
Background
The optical diffusion film can play a role in correcting the diffusion angle in the backlight module, so that the light radiation area is increased, and a plurality of refraction, reflection and scattering phenomena can occur after light rays penetrate through the diffusion film, so that a uniform surface light source is formed, and the optical diffusion effect is achieved. Optical diffusion films are currently widely used in devices requiring a light source, such as liquid crystal displays, advertising backlights, illumination light boxes, etc., to provide uniform illumination. Along with the rapid development of display technology, the requirements for shielding performance and optical performance of the optical diffusion film are increasingly improved to meet the development trend of ultrathin display, reduced cost and functionalization.
In the prior art, the basic structure of most diffusion films is that optical light scattering particles are coated on two sides of a transparent base material (such as polyethylene terephthalate (PET)), so that the light emitted by a light guide plate can achieve a better light homogenizing effect, but only few particles with larger particle size protrude out of a coating layer, and the particle coating density is smaller, so that the structure cannot effectively shield the bright spots of the light guide plate, and the problem of serious halation is easy to occur when the structure is used as an LED backlight module. Also, the presence of a large amount of particles will cause the brightness of the light to decrease.
Disclosure of Invention
To solve at least one problem in the background art, the present application provides an optical diffusion composite film.
In addition, the application also provides a backlight module comprising the optical diffusion composite film.
The application provides an optical diffusion composite film, including first structural layer with set up in the second structural layer of the relative both sides of first structural layer, first structural layer for the both sides surface on second structural layer is equipped with a plurality of diffusion grooves respectively, the second structural layer deviates from the surface on first structural layer is equipped with the prism structural layer.
Further, the first structural layer is made of polycarbonate, and the second structural layer is made of polymethyl methacrylate.
Further, the diffusion groove comprises a smooth bottom wall and an inner wall surrounding the bottom wall, and the surface of the inner wall is provided with a roughened first fog face structure layer.
Further, the diffusion groove is in a truncated cone shape.
Further, a plurality of diffusion grooves are arranged at intervals, and accommodating spaces are formed between the adjacent diffusion grooves;
the diffusion groove on one side of the first structural layer is arranged corresponding to the accommodating space on the other side.
Further, a roughened second matte structure layer is arranged on the surface, facing the first structure layer, of the second structure layer.
Further, the optical diffusion composite film is provided with a light incident surface and a light emergent surface, and the prism structure layer positioned at one side of the light incident surface comprises a plurality of triangular cones which are closely arranged.
Further, each triangular cone comprises three straight edges connected end to end, and each straight edge is overlapped with one straight edge of the adjacent other triangular cone.
Further, the prism structure layer positioned at one side of the light-emitting surface comprises a plurality of prism columns which are arranged in parallel.
The application also provides a backlight module, which comprises the optical diffusion composite film.
The optical diffusion composite film provided by the application forms the diffusion groove at the joint of the first structural layer and the second structural layer, and light rays can be reflected, refracted and scattered in the diffusion groove, so that the light rays can be fully diffused, and the influence of halation is effectively reduced. And by arranging the prism structure layer on the surface of the second structure layer, light can be uniformly diffused in a plurality of directions in the prism structure, so that the light is reduced from directly entering the optical diffusion composite film, and the light is fully guided into the optical diffusion composite film for diffusion. Compared with the mode of arranging diffusion particles in the prior art, the optical diffusion composite film has higher brightness and light-homogenizing effect.
Drawings
Fig. 1 is a schematic cross-sectional structure of an optical diffusion composite film according to an embodiment of the present disclosure.
Fig. 2 is an exploded cross-sectional structure schematic view of the optical diffusion composite membrane shown in fig. 1.
Fig. 3 is an exploded perspective view of the optical diffusion composite membrane shown in fig. 1.
Fig. 4 is a schematic perspective view of the first structural layer shown in fig. 3.
Fig. 5 is a schematic structural diagram of the first structural layer shown in fig. 4.
Fig. 6 is a schematic structural diagram of the light incident surface of the optical diffusion composite film shown in fig. 2.
Fig. 7 is a schematic structural diagram of a light-emitting surface of the optical diffusion composite film shown in fig. 2.
Fig. 8 is a schematic side view of a prism structure layer of the light incident surface shown in fig. 2.
Fig. 9 is a schematic perspective view of a prism structure layer of the light incident surface shown in fig. 2.
Fig. 10 is a schematic view of the diffusion principle of light in the optical diffusion composite film shown in fig. 2.
Fig. 11 is a schematic view of the diffusion principle of light in the optical diffusion composite film shown in fig. 2.
Fig. 12 is a schematic diagram of a backlight module according to an embodiment of the disclosure.
Description of the main reference signs
Optical diffusion composite film 100
First structural layer 10
Accommodation space R
Second structural layer 20
Diffusion body 22
Second matte structural layer 24
Vertex 262
Light incident surface A
Light-emitting surface B
First direction V1
Second direction V2
Light ray L
The following detailed description will further illustrate the application in conjunction with the above-described figures.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application.
Referring to fig. 1, 2 and 3, an embodiment of the present application provides an optical diffusion composite film 100, and the optical diffusion composite film 100 can be applied to a backlight module 200.
The optical diffusion composite film 100 includes a first structural layer 10 and a second structural layer 20 disposed on opposite sides of the first structural layer 10. The first structural layer 10 includes a substrate body 12, a plurality of diffusion grooves 14 are formed on two surfaces of the substrate body 12 facing the second structural layer 20 in a concave manner, each diffusion groove 14 has a trapezoid cross-sectional shape, the diffusion groove 14 includes an opening 142, an inner wall 144 and a bottom wall 146, the opening 142 faces the second structural layer 20, the opening 142 and the bottom wall 146 are oppositely disposed, the inner wall 144 is an inclined plane compared with the bottom wall 146, and one side of the inner wall 144 is disposed around the bottom wall 146. The inner wall 144 is embossed or sandblasted to form a roughened first matte finish 16. The second structural layer 20 includes a diffusion body 22, and a surface of the diffusion body 22 facing the first structural layer 10 is embossed or sandblasted to form a roughened second matte structural layer 24, and the second matte structural layer 24 is in contact with the diffusion groove 14. The surface of the diffusion body 22 facing away from the first structural layer 10 is provided with a prismatic structural layer 26. The prism structure layer 26 of one of the second structure layers 20 is used as a light incident surface a, the prism structure layer 26 of the other second structure layer 20 is used as a light emergent surface B, and the light L enters the optical diffusion composite film 100 from the light incident surface a and then exits from the optical diffusion composite film 100 from the light emergent surface B.
The substrate body 12 and the diffusion body 22 are both made of transparent materials, specifically, the substrate body 12 is made of Polycarbonate (PC), and the diffusion body 22 is made of polymethyl methacrylate (PMMA).
Wherein, the Polycarbonate (PC) has better toughness and impact strength than polymethyl methacrylate (PMMA), but has poorer light transmittance of only 86-89 percent. And polymethyl methacrylate (PMMA) is a brittle material, but the light transmittance can reach 92%. The Polycarbonate (PC) has better temperature resistance than polymethyl methacrylate (PMMA), the glass transition temperature (Tg) of the Polycarbonate (PC) reaches 120 ℃, and the glass transition temperature of the polymethyl methacrylate (PMMA) is 85 ℃. The scratch resistance of Polycarbonate (PC) surfaces is far less than polymethyl methacrylate (PMMA). Polycarbonate (PC), which is subject to yellowing by ultraviolet light, does not absorb water. The use of polymethyl methacrylate (PMMA) and Polycarbonate (PC) in combination in the present application can complement the deficiencies in the optical properties of a single material (i.e., polycarbonate) while maintaining mechanical properties such as toughness, impact strength, and the like.
Referring to fig. 2, 4 and 5, the optical diffusion composite film 100 has a first direction V1 and a second direction V2 perpendicular to the first direction V1, a plurality of diffusion grooves 14 are uniformly spaced along the first direction V1 and the second direction V2, and gaps 18 are disposed between adjacent diffusion grooves 14, so that an accommodating space R is defined between adjacent 4 diffusion grooves 14, the diffusion grooves 14 on the first side surface 11 of the first structural layer 10 are disposed corresponding to the accommodating space R on the other second side surface 12, and therefore, after entering the light incident surface a of one second structural layer 20, the light L entering the diffusion groove 14 on the first side surface 11 of the first structural layer 10 and not passing through the diffusion groove 14 on the first side surface 11 can be diffused through the diffusion groove 14 on the second side surface 12, and then exit through the light exiting surface B of the second structural layer 20.
In this embodiment, the diffusion groove 14 has a truncated cone shape, the opening 142 and the bottom wall 146 have a circular shape, and the diameter of the opening 142 is larger than the diameter of the bottom wall 146. The cross-sectional shape of the inner wall 144 is trapezoidal. The bottom wall 146 is smooth and planar so as to refract and reflect more light L. In other embodiments, the shape of the opening 142 and the bottom wall 146 may each be, independently, elliptical, polygonal, or other irregular shapes.
The diffusion groove 14 may be integrally formed or adhesively formed, and in this embodiment, the substrate body 12 and the diffusion groove 14 are integrally formed. The diffusion groove 14 is not limited in its manufacturing method, and may be formed on the substrate body 12 by hot pressing, uv curing, molding, or the like.
Referring to fig. 3, 6, 7, 8 and 9, the prism structure layer 26 on one side of the light incident surface a is formed by closely arranging a plurality of triangular pyramids 261, each triangular pyramid 261 includes an apex 262 and three straight sides 263, each straight side 263 coincides with one straight side 263 of another adjacent triangular pyramid 261, that is, each triangular pyramid 261 is co-bordered by another three triangular pyramids 261, so that the plurality of triangular pyramids 261 are closely arranged in a plane formed by the first direction V1 and the second direction V2 to form the prism structure layer 26, so that light L can uniformly spread in a plurality of directions in the triangular pyramid structure, the light L is reduced from directly entering the optical diffusion composite film 100, and the light L is fully guided to the optical diffusion composite film 100 for diffusion.
The prism structure layer 26 on the light-emitting surface B side is formed by arranging a plurality of prism columns 264 in parallel, each prism column 264 extends along the first direction V1, and a plurality of prism columns 264 are arranged in parallel along the second direction V2 and are connected to each other. The cross-sectional shape of each of the prism columns 264 is triangular.
The prism structure layer 26 may be concavely or convexly disposed on the diffusion body 22, and in this embodiment, is concavely disposed on the diffusion body 22. The prism structure layer 26 may be integrally formed or adhesively formed, and in this embodiment, the diffusion body 22 and the prism structure layer 26 are integrally formed. The prism structure layer 26 may be formed on the diffusion body 22 by hot pressing, uv curing, molding, etc., without limitation.
In the specific manufacturing of the optical diffusion composite film 100, the PC transparent plastic may be extruded by using a slit Die (slit Die) and then extruded by a roller to form the first structural layer 10. Wherein, there is a trapezoid bump on the roller, the polishing of short side top is mirror surface (corresponding to the bottom wall 146), the oblique sides of two sides are provided with sand blasting fog structures (corresponding to the inner wall 144 and the first fog structure layer 16) with different diameters of about 1-20 microns, the stamping depth can be adjusted, and different roughness and haze can be obtained by different depths. Then, the PMMA transparent plastic is molded into the second structural layer 20 by using two slit dies (slit Die), the temperature is about 230 to 250 ℃, the PMMA films with the thickness of 50 to 100 micrometers are respectively molded, the films are embossed with rollers to form a structural surface with a mist structure on one side, and the structural surface is provided with a sand blasting mist structure (namely the second mist structural layer 24) with different thickness of about 1 to 20 micrometers. Finally, when the temperature of the PC layer is reduced to about 180 ℃, the PC layer and the PMMA films are simultaneously subjected to hot press molding by rollers, and the optical diffusion composite film 100 is obtained.
Referring to fig. 10 and 11, the light L passes through the second structural layer 20 via the prism structural layer 26, most of the junctions between the second structural layer 20 and the first structural layer 10 are provided with diffusion grooves 14, the inner walls 144 of the diffusion grooves 14 are provided with first hazy structural layers 16, and a side of the second structural layer 20 facing the first structural layer 10 is provided with a second hazy structural layer 24. After the light L enters, the light L passes through the second matte structure layer 24 and is diffused in the diffusion groove 14, and the bottom wall 146 of the diffusion groove 14 is a smooth plane, so that more light can be refracted and reflected. The circular arc-shaped inner wall 144 and the first matte structure layer 16 can diffuse the light ray around, so that the light ray L can be scattered farther.
Therefore, whether the light L is directly injected into the substrate body 12 or scattered through the diffusion groove 14, the light L travels in the first structural layer 10 in the following two manners: (1) When the light reaches the smooth bottom wall 146, more light is refracted and reflected, and the light is more uniformly diffused. (2) When the light enters the diffusion groove 14 from the substrate body 12 through the inner wall 144 with the first haze structure layer 16, the light enters the other diffusion body 22 through the second haze structure layer 24 in the diffusion groove 14, and exits through the prism structure layer 26 of the light exit surface.
The present application provides the optical diffusion composite film 100, by forming the diffusion groove 14 at the joint of the first structural layer 10 and the second structural layer 20, the light L can be reflected, refracted and scattered in the diffusion groove 14, so that the light L can be fully diffused, thereby effectively reducing the influence of halation, i.e. having an excellent light homogenizing effect. By providing the prism structure layer 26 on the surface of the second structure layer 20, the light L can be uniformly diffused in a plurality of directions in the prism structure, and the light is reduced from directly entering the optical diffusion composite film 100, and is sufficiently guided to the optical diffusion composite film 100 to be diffused. In addition, by providing the second matte structure layer 24 on the surface of the second structure layer 20 facing the first structure layer 10, the incident light can be diffused around, so that the light can be more sufficiently diffused.
The second structural layer 20 in the optical diffusion composite film 100 has no diffusion particles and thus has higher brightness. By setting the material of the second structural layer 20 as a PMMA layer, PMMA has high light transmittance and is compounded with the first structural layer 10 of PC, so that the optical diffusion composite film 100 has high light transmittance.
In summary, the optical diffusion composite film 100 has high brightness and light-equalizing effect. The light L passes through the prism structure layer 26, enters the second structure layer 20, and passes through the first structure layer 10 and the second structure layer 20, and by arranging the diffusion grooves 14, the first matte structure layer 16 and the second matte structure layer 24, many phenomena of refraction, reflection and scattering occur on the light, so that the light can be modified into a uniform surface light source to achieve the effect of optical diffusion, the light radiation area is increased, and the light intensity per unit area is reduced. After the light-emitting source is diffused by the optical diffusion composite film 100, a regenerated light source with higher brightness and better uniformity is formed.
Referring to fig. 12, the embodiment of the present application further provides a side-light type backlight module 200, where the backlight module 200 includes a light source 201, a light guide plate 202, and the optical diffusion composite film 100. The light source 201 may be any one of an electroluminescent source (EL), a small Cold Cathode Fluorescent Lamp (CCFL), and a Light Emitting Diode (LED).
Hereinabove, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that various changes and substitutions can be made in the specific embodiments of the present application without departing from the spirit and scope of the present application. Such modifications and substitutions are intended to be within the scope of the present application.
Claims (10)
1. The optical diffusion composite film is characterized by comprising a first structural layer and second structural layers arranged on two opposite sides of the first structural layer, wherein a plurality of diffusion grooves are respectively formed in two surfaces of the first structural layer, and prism structural layers are arranged on surfaces, deviating from the first structural layer, of the second structural layer.
2. The optical diffusion composite membrane of claim 1, wherein the first structural layer is polycarbonate and the second structural layer is polymethyl methacrylate.
3. The optical diffusion composite membrane of claim 1, wherein the diffusion channel comprises a smooth bottom wall and an inner wall surrounding the bottom wall, the surface of the inner wall being provided with a roughened first matte finish.
4. The optical diffusion composite membrane of claim 1, wherein said diffusion channel is frustoconical.
5. The optical diffusion composite membrane of claim 1, wherein a plurality of said diffusion grooves are arranged at intervals, and a receiving space is formed between adjacent ones of the plurality of diffusion grooves;
the diffusion groove on one side of the first structural layer is arranged corresponding to the accommodating space on the other side.
6. The optical diffusion composite membrane of claim 1, wherein a surface of the second structural layer facing the first structural layer is provided with a roughened second matte structural layer.
7. The optical diffusion composite film according to claim 1, wherein the optical diffusion composite film has an incident surface and an exit surface, and the prism structure layer on one side of the incident surface comprises a plurality of closely arranged triangular pyramids.
8. The optical diffusion composite membrane of claim 7, wherein each of said triangular pyramids comprises three straight edges connected end to end, each straight edge coinciding with one of the straight edges of an adjacent other of said triangular pyramids.
9. The optical diffusion composite membrane of claim 7, wherein said prismatic structure layer on the light exit side comprises a plurality of prismatic columns arranged in parallel.
10. A backlight module comprising the optical diffusion composite film according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223535514.6U CN219201971U (en) | 2022-12-29 | 2022-12-29 | Optical diffusion composite film and backlight module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223535514.6U CN219201971U (en) | 2022-12-29 | 2022-12-29 | Optical diffusion composite film and backlight module |
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| Publication Number | Publication Date |
|---|---|
| CN219201971U true CN219201971U (en) | 2023-06-16 |
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| CN202223535514.6U Active CN219201971U (en) | 2022-12-29 | 2022-12-29 | Optical diffusion composite film and backlight module |
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