TWI818782B - Multilayer optical film structure and manufacturing method thereof - Google Patents

Abstract

A multilayer optical film structures and manufacturing method thereof is provided. The multilayer optical film structure includes a substrate, a first optical structural layer, and a second optical structural layer. The substrate has a first surface and a second surface opposite to each other. The first optical structural layer disposed on the first layer of the substrate. The second optical structural layer disposed on the second layer of the substrate. The second layer includes a first structure layer, a second structure layer, and a third structure layer. The first structure layer is between the substrate and the second structure layer, and the second structure layer is between the first structure layer and the third structure layer. A difference of the refractive index between the first structure layer and the second structure layer is larger than 0.1.

Description

Multilayer optical film structure and production method thereof

The present invention relates to an optical film structure and a manufacturing method thereof, in particular to a multi-layer optical film structure and a manufacturing method thereof.

Backlight modules are widely used in liquid crystal display devices to provide the light source required to display images. The light-emitting components in the backlight module usually use multiple arrays of light-emitting diodes (LEDs) or sub-millimeter light-emitting diodes (mini LEDs). The light beams generated are concentrated and have high directivity. In order to adjust the light beam generated by the light-emitting component, that is, to convert the point light source array generated by the light-emitting component into a surface light source, an optical component is provided on the backlight module.

In the existing technology, in order to distribute the brightness evenly, optical components usually use more optical films, such as light guide films, diffusion films, brightness-enhancing films and other optical films to take advantage of physical phenomena such as light refraction, reflection or scattering. to adjust the light. However, this cannot balance the thickness and brightness uniformity of optical components. Therefore, how to improve the diffusion effect of the optical film structure and overcome the above-mentioned defects through structural design improvements has become one of the important issues to be solved in this project.

The technical problem to be solved by the present invention is to provide an optical film structure and a manufacturing method thereof in view of the shortcomings of the existing technology. The optical film structure provided by the invention has a special structure and refractive index. The regularly arranged multi-layer structure has a good diffusion effect for point light sources and can be used in light-emitting modules of display devices.

In order to solve the above technical problems, one technical solution adopted by the present invention is to provide a multi-layer optical film structure. The multilayer optical film structure includes a base layer, a first optical structure and a second optical structure. The base layer has a first surface and a second surface opposite to the first surface. The first optical structure is disposed on the first surface of the base layer. The second optical structure is disposed on the second surface of the base layer and includes a first structural layer, a second structural layer and a third structural layer. The first structural layer is located between the base layer and the second structural layer, and the second structural layer is located between the first structural layer and the third structural layer. The difference in refractive index between the first structural layer and the second structural layer is greater than or equal to 0.1.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a method for manufacturing a multi-layer optical film structure. The method of manufacturing a multi-layer optical film structure includes: forming a base layer; forming the first optical structure on the first surface of the base layer; forming the first structural layer on the third surface of the base layer. two surfaces; forming the second structural layer on the first structural layer; and forming the third structural layer on the second structural layer.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a method for manufacturing a multi-layer optical film structure. The method of manufacturing a multi-layer optical film structure includes: forming the base layer; forming the first structural layer on the second surface of the base layer; forming the first optical structure on all surfaces of the base layer. the first surface; forming the second structural layer on the first structural layer; and forming the third structural layer on the second structural layer.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a method for manufacturing a multi-layer optical film structure. The method of manufacturing a multilayer optical film structure includes: forming the base layer; forming the first structural layer on the second surface of the base layer; The second structural layer is formed on the first structural layer; the first optical structure is formed on the first surface of the base layer; and the third structural layer is formed on the third structural layer. On the second structural layer.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a method for manufacturing a multi-layer optical film structure. The method of manufacturing a multi-layer optical film structure includes: forming the base layer; forming the first structural layer on the second surface of the base layer; forming the second structural layer on the first structural layer on; forming the third structural layer on the second structural layer; and forming the first optical structure on the first surface of the base layer.

One of the beneficial effects of the present invention is that the multilayer optical film structure and the manufacturing method provided by the present invention can be configured by "the first optical structure is disposed on the first surface of the base layer, and the second optical structure is disposed on the third surface of the base layer." "Two surfaces", "The second optical structure includes a first structural layer, a second structural layer and a third structural layer", "The first structural layer is located between the base layer and the second structural layer, and the second structural layer is located between the first "between the structural layer and the third structural layer" and "the difference in refractive index between the first structural layer and the second structural layer is greater than or equal to 0.1" to diffuse the light beam generated by the light-emitting component.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not used to limit the present invention.

1A: Optical film structure

10: Basal layer

10a: First surface

10b: Second surface

11: First optical structure

12: Second optical structure

12L: ridge line

121: First structural layer

121A: Recessed microstructure

122A:Protruding microstructure

122S: light incident surface

122:Second structural layer

123: The third structural layer

d1~d4: distance

θ1~θ4: angle

S1~S3: Inclined surface

D1, D2: direction

S100~S408: steps

Figure 1 is a schematic diagram of the first embodiment of the present invention.

FIG. 2 is a partial three-dimensional exploded view of an optical film according to an embodiment of the present invention.

FIG. 3 is a partial three-dimensional exploded view of an optical film according to another embodiment of the present invention.

FIG. 4 is a flow chart of a method for manufacturing an optical film according to an embodiment of the present invention.

FIG. 5 is a flow chart of a method for manufacturing an optical film according to an embodiment of the present invention.

FIG. 6 is a flow chart of a method for manufacturing an optical film according to an embodiment of the present invention.

FIG. 7 is a flow chart of a method for manufacturing an optical film according to an embodiment of the present invention.

The following is a specific example to illustrate the implementation of the "multilayer optical film structure and its manufacturing method" disclosed in the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depictions based on actual dimensions, as is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of the present invention. In addition, the term "or" used in this article shall include any one or combination of more of the associated listed items depending on the actual situation.

It should be understood that although terms such as “first”, “second” and “third” may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another component or one signal from another signal. In addition, the term "or" used in this article shall include any one or combination of more of the associated listed items depending on the actual situation.

[First Embodiment]

Referring to Figure 1, Figure 1 is a schematic diagram of a first embodiment of the present invention. The first embodiment of the present invention provides a multi-layer optical film structure 1A, which includes: a base layer 10, a first optical structure 11 and a second optical structure 12 . The multilayer optical film structure 1A of the present invention can be directly or indirectly disposed on the light-emitting component. to evenly diffuse the light beam generated by the light-emitting component. Furthermore, the optical film 1A can be used as a diffusion sheet or a brightness enhancement sheet to convert point light sources or linear light sources into surface light sources. In an embodiment, the total thickness of the multilayer optical film 1A may be 40 μm to 300 μm.

Furthermore, the base layer 10 has a first surface 10a and a second surface 10b opposite to the first surface 10a. The optical film 1A has a light incident side and a light exit side opposite to the light incident side. In this embodiment, the first surface 10a of the base layer 10 faces the light emitting side, and the second surface 10b of the base layer 10 faces the light incident side. In addition, the first optical structure 11 is disposed on the first surface 10 a and is located on the light exit side of the base layer 10 . Therefore, the first optical structure 11 has a light-emitting surface facing away from the light-emitting component. In this embodiment, the thickness of the first optical structure 11 ranges from 5um to 50um. The refractive index of the first optical structure 11 is preferably 1.42 to 1.70. In this embodiment, the first optical structure 11 may be in a concave pyramid shape or a convex pyramid shape.

The base layer 10 may be made of polyethylene terephthalate (PET), polystyrene (PS), polycarbonate (PC), polyurethane (PU), polypropylene (PP), or polychloride. Ethylene (PVC), acrylic (PMMA), acrylic (MMA), etc. As long as the material constituting the base layer 10 can allow light beams to pass through, the present invention is not limited. In addition, the thickness of the base layer 10 may be 30 μm to 250 μm, preferably 50 μm to 125 μm, which is easier to process. For example, the refractive index of the base layer 10 may be 1.50 to 1.60.

In addition, the optical film 1A further includes a second optical structure 12 disposed on the second surface 10b of the base layer 10 and located on the light incident side of the optical film 1A. That is to say, the first optical structure 11 is disposed on the light-emitting side of the base layer 10 , and the second optical structure 12 is disposed on the light-incoming side of the base layer 10 .

In this embodiment, the second optical structure 12 includes a first structural layer 121, a second structural layer 122 and a third structural layer 123. In detail, the first structural layer 121 is located between the base layer 10 and the second structural layer 122 , and the second structural layer 122 is located between the first structural layer 121 and the third structural layer 123 . That is to say, when the second optical structure 12 is disposed on the light incident side of the base layer 10, the first structure The layer 121 is closest to the base layer 10 , and the third structural layer 123 is farthest from the base layer 10 .

Accordingly, when the optical film 1A is disposed on the light-emitting component, the third structural layer 123 has a light incident surface facing the light-emitting component. That is to say, the light beams generated by the multiple light-emitting units in the light-emitting component will enter the optical film 1A through the light incident surface of the third structural layer 123, and then pass through the second structural layer 122, the first structural layer 121, and the base layer 10 , and emitted from the light exit surface of the first optical structure 11 .

Furthermore, the surface of the first optical structure 11 includes a plurality of first inclined surfaces S1, and each two connected first inclined surfaces S1 jointly form a first included angle θ1. In addition, in the second optical structure 12 , the interface between the first structural layer 121 and the second structural layer 122 includes a plurality of second inclined surfaces S2 , and each second inclined surface S2 is inclined relative to the thickness direction of the base layer 10 . In this embodiment, each two connected second inclined surfaces S2 together form a second included angle θ2 (or a third included angle θ3). The surface of the third structural layer 123 includes a plurality of third inclined surfaces S3, and each two connected third inclined surfaces S3 jointly form a fourth included angle θ4.

In other words, the first optical structure 11 has a plurality of first sharp corners with an angle θ1, the first structural layer 121 has a plurality of second sharp corners with an angle θ2, and the second structural layer 122 has a plurality of third sharp corners with an angle θ2. sharp corners having an angle θ3, and the third structural layer 123 has a plurality of fourth sharp corners having an angle θ4. In this embodiment, the angles of the first sharp angle θ1 and the fourth sharp angle θ4 are both larger than the angle θ2 of the second sharp angle and the angle θ3 of the third sharp angle. For example, the angle θ1 of the first sharp angle and the angle θ4 of the fourth sharp angle are 70 to 100 degrees, preferably 90 degrees, to facilitate total reflection of the light beam. The angle between the second sharp angle θ2 and the third sharp angle θ3 is 40 to 60 degrees, preferably 50 degrees.

On the other hand, there is a distance d1 between two adjacent first sharp corners, a distance d2 between two adjacent second sharp corners, a distance d3 between two adjacent third sharp corners, and There is a distance d4 between two adjacent fourth sharp corners. In this embodiment, both the distance d1 and the distance d4 are larger than the distance d2 and the distance d3.

It should be noted that the surface profile of the first structural layer 121 is consistent with the surface profile of the second structural layer 122 Surface profiles can be matched to each other. The first structural layer 121 has multiple microstructures. Each microstructure can be a triangular prism, a trapezoidal column, an arcuate column, a convex pyramid, a concave pyramid or other pyramids, wherein the concave pyramid structure can be a three-sided concave pyramid structure or A four-sided concave pyramid structure and a convex pyramid structure may be a three-sided convex pyramid structure or a four-sided convex pyramid structure, but the invention is not limited thereto.

In this embodiment, the first structural layer 121 has a plurality of recessed microstructures 121A, and the second structural layer 122 fills the plurality of recessed microstructures 121A and has a light incident surface 122S. Specifically, the first structural layer 121 having a plurality of recessed microstructures 121A can be first produced, and then the glue material is filled into the plurality of recessed microstructures 121A to form the second structural layer 122 . Therefore, the second structural layer 122 will have a plurality of protruding microstructures 122A.

Please refer to FIG. 2 , which is a partially exploded schematic diagram of an optical film according to an embodiment of the present invention. In this embodiment, the first optical structure 11 has a plurality of recessed microstructures, and the recessed microstructures are recessed toward the direction of the base layer 10 . The recessed microstructure 121A is a concave pyramid microstructure, and the protruding microstructure 122A is a convex pyramid microstructure. The recessed microstructure 121A may include four interconnected triangular bevels, and the four triangular bevels will be connected to each other so that the recessed microstructure 121A has a closed open end, which helps the light beam entering the second optical structure 12 to be redirected. Reflected and refracted many times. In another embodiment, each recessed microstructure 121A (or protruding microstructure 122A) may also have three triangular slopes, but the invention is not limited thereto.

When the light beam generated by one of the light-emitting units enters the second optical structure 12 , it can be transmitted laterally for a certain distance in the second optical structure 12 through multiple reflections and refractions, and then enters the base layer 10 . In this way, the light equalizing effect of the optical film 2A can be increased.

Please refer to FIG. 3 , which is a partial three-dimensional exploded view of an optical film according to another embodiment of the present invention. In the embodiment shown in FIG. 3 , the first structural layer 121 includes a plurality of triangular prisms, each triangular prism having a ridge 12L extending along the second direction D2. Corresponding to the first structural layer 121, the second structural layer 122 also includes a plurality of triangular prisms extending along the second direction D2. However, in another aspect of the present invention In one embodiment, the ridge lines 12L of the plurality of triangular prisms of the first structural layer 121 and the plurality of triangular prisms of the second structural layer 122 may extend along the first direction D1. In this embodiment, the plurality of triangular prisms can have different widths and depths. For example, the width of the triangular prisms can be 5um to 50um, and the depth can be 5um to 50um.

It should be noted that when a light beam enters a medium with a lower refractive index from a medium with a higher refractive index, and the incident angle of the light beam is greater than the critical angle, the light beam will be totally reflected. On the contrary, when a light beam enters a medium with a higher refractive index from a medium with a lower refractive index, the light beam will not be totally reflected, but will be divided into refracted light and reflected light. In this article, high refractive index refers to the refractive index range between 1.50 and 1.70, and low refractive index refers to the refractive index range between 1.40 and 1.50.

Therefore, in this embodiment, the higher the refractive index of the first optical structure 11 is, the better, preferably above 1.70. Specifically, the first optical structure 11 is a high refractive index layer, and the first structural layer 121 is a low refractive index layer. The refractive index layer, the second structural layer 122 and the third structural layer 123 are combined into a high refractive index layer. In other words, the refractive index of the second structural layer 122 and the third structural layer 123 may be the same. It should be noted that the difference in refractive index between the first structural layer 121 and the second structural layer 122 must be greater than or equal to 0.1 in order to achieve a good light uniformity effect. If the difference in refractive index between the first structural layer 121 and the second structural layer 122 is less than 0.1, the brightness cannot be uniformly distributed.

In this embodiment, the refractive index of the first structural layer 121 is smaller than the refractive index of the second structural layer 122 and the third structural layer 123 . Specifically, the refractive index of the first optical structure 11 is 1.63, the refractive index of the base layer is 1.57, the refractive index of the first structural layer 121 is 1.45, the refractive index of the second structural layer 122 is 1.63, and the refractive index of the third structural layer 123 The refractive index is 1.63.

[Second Embodiment]

This embodiment is substantially the same as the first embodiment, and the differences are explained as follows. In this embodiment, the first optical structure 11 and the second structural layer 122 are high refractive index layers, and the first structural layer 121 and the third structural layer 123 are combined into a low refractive index layer. In other words, the refractive index of the second structural layer 122 and the third structural layer 123 may be different. In this embodiment, the refractive index of the second structural layer 122 is large The refractive index of the first structural layer 121 and the third structural layer 123. Specifically, the refractive index of the first optical structure 11 is 1.63, the refractive index of the base layer is 1.57, the refractive index of the first structural layer 121 is 1.45, the refractive index of the second structural layer 122 is 1.63, and the refractive index of the third structural layer 123 The refractive index is 1.45.

For example, the high refractive index glue material may contain zirconia particles, and the low refractive index glue material may contain fluoride particles or silicon oxide particles. However, the above examples are only one of the possible embodiments and are not intended to limit the present invention.

[Third Embodiment]

This embodiment is substantially the same as the first embodiment, and the differences are explained as follows. In this embodiment, the first optical structure 11, the first structural layer 121 and the third structural layer 123 are high refractive index layers, and the second structural layer 122 is a low refractive index layer. In this embodiment, the refractive index of the second structural layer 122 is smaller than the refractive index of the first structural layer 121 and the third structural layer 123 . Specifically, the refractive index of the first optical structure 11 is 1.63, the refractive index of the base layer is 1.57, the refractive index of the first structural layer 121 is 1.63, the refractive index of the second structural layer 122 is 1.45, and the refractive index of the third structural layer 123 The refractive index is 1.63.

[Fourth Embodiment]

This embodiment is substantially the same as the first embodiment, and the differences are explained as follows. In this embodiment, the first optical structure 11 and the first structural layer 121 are high refractive index layers, and the second structural layer 122 and the third structural layer 123 are low refractive index layers. In this embodiment, the refractive index of the first structural layer 121 is greater than the refractive index of the second structural layer 122 and the third structural layer 123 . Specifically, the refractive index of the first optical structure 11 is 1.63, the refractive index of the base layer is 1.57, the refractive index of the first structural layer 121 is 1.63, the refractive index of the second structural layer 122 is 1.45, and the refractive index of the third structural layer 123 The refractive index is 1.45.

It should be noted that since the incident light is reflected by the first optical structure 11 and then moves in the opposite direction, the light is reflected again by the second optical structure 12 and returns to the light emitting surface. Therefore, in the second optical structure 12 of the present invention, the refractive indexes of the first structural layer 121, the second structural layer 122 and the third structural layer 123 can be set oppositely, so that through multiple refraction, reflection or total reflection, The light distribution is more even.

Regarding the above-mentioned first to fourth embodiments, refer to FIGS. 4 to 7 , which provide a flow chart of a manufacturing method of an optical film according to the present invention.

In an embodiment of the present invention, referring to Figure 4, it includes at least the following steps: S100: forming the base layer 10; S102: forming the first optical structure 11 on the first surface 10a of the base layer 10; S104: The first structural layer 121 is formed on the second surface 10b of the base layer 10; S106: the second structural layer 122 is formed on the first structural layer 121; and S108: the third structural layer 123 is formed on the second structural layer 122 .

In another embodiment of the present invention, referring to Figure 5, the present invention provides a flow chart of a manufacturing method of an optical film, which at least includes the following steps: S200: forming the base layer 10; S202: converting the first structural layer 121 is formed on the second surface 10b of the base layer 10; S204: Form the first optical structure 11 on the first surface 10a of the base layer 10; S206: Form the second structural layer 122 on the first structural layer 121; and S208 : The third structural layer 123 is formed on the second structural layer 122.

In another embodiment of the present invention, referring to Figure 6, the present invention provides a flow chart of a manufacturing method of an optical film, which at least includes the following steps: S300: forming the base layer 10; S302: converting the first structural layer 121 is formed on the second surface 10b of the base layer 10; S304: Form the second structural layer 122 on the first structural layer 121; S306: Form the first optical structure 11 on the first surface 10a of the base layer 10; and S308 : The third structural layer 123 is formed on the second structural layer 122.

In another embodiment of the present invention, referring to Figure 7, the present invention provides a flow chart of a manufacturing method of an optical film, which at least includes the following steps: S400: forming the base layer 10; S402: converting the first structural layer 121 is formed on the second surface 10b of the base layer 10; S404: form the second structural layer 122 on the first structural layer 121; S406: form the third structural layer 123 on the second structural layer 122; and S408: form The first optical structure 11 is formed on the first surface 10a of the base layer 10.

In the present invention, the optical film can be produced layer by layer by roll to roll or molding. In addition, the base layer 10 may be made of polyethylene terephthalate (PET), polystyrene (PS), polycarbonate (PC), polyurethane (PU), polypropylene (PP), polyvinyl chloride ( Made of PVC), acrylic (PMMA), acrylic (MMA), etc. However, as long as the material constituting the base layer 10 can allow the light beam to pass through, the present invention is not limited. Considering subsequent processing and application, the thickness of the base layer 10 may be 30 μm to 250 μm, preferably 50 μm to 125 μm.

It should be noted that, from a side view, the first optical structure 11 has a plurality of first sharp corners, the first structural layer 121 has a plurality of second sharp corners, and the second structural layer 122 has a plurality of third sharp corners. And the third structural layer 123 has a plurality of fourth sharp corners. Further, the first sharp corner has an angle θ1, the second sharp corner has an angle θ2, the third sharp corner has an angle θ3, and the fourth sharp corner has an angle θ4. In an embodiment of the invention, the angles of the first sharp angle θ1 and the fourth sharp angle θ4 are both greater than the angle θ2 of the second sharp angle and the angle θ3 of the third sharp angle.

Specifically, the angle θ1 of the first sharp angle can be set to 70 to 100 degrees, preferably 90 degrees. The angle θ2 of the second sharp angle can be set to 40 to 60 degrees, preferably 50 degrees. The angle θ3 of the third sharp angle can be set to 40 to 60 degrees, preferably 50 degrees. The angle θ4 of the fourth sharp angle can be set to 70 to 100 degrees, preferably 90 degrees. In one embodiment, since the angle θ4 of the fourth sharp angle approaches 90 degrees, it is beneficial to total reflection of the light beam.

[Beneficial effects of the embodiment]

One of the beneficial effects of the present invention is that the multilayer optical film structure and the manufacturing method provided by the present invention can be configured by "the first optical structure is disposed on the first surface of the base layer, and the second optical structure is disposed on the third surface of the base layer." "Two surfaces", "The second optical structure includes a first structural layer, a second structural layer and a third structural layer", "The first structural layer is located between the base layer and the second structural layer, and the second structural layer is located between the first "between the structural layer and the third structural layer" and "refraction of the first structural layer The refractive index difference between the refractive index and the second structural layer is greater than or equal to 0.1" to diffuse the light beam generated by the light-emitting component.

Furthermore, by setting the angle θ4 of the fourth sharp angle to be close to 90 degrees, the probability of the light beam generated by the light-emitting unit being totally reflected when it is first projected onto the third slope S3 can be greatly increased, thereby improving the Light expansion effect.

Compared with the existing backlight module, the multi-layer optical film structure of the embodiment of the present invention can output diffused point light sources through the arrangement of structural layers. Accordingly, the multilayer optical film structure of the present invention can replace the conventional method of using additional diffusion sheets and brightness enhancement sheets. Even if the number of optical films in the optical assembly is reduced, uniform brightness distribution can still be achieved in the display area. In this way, the total thickness of the optical component and the size of the display device can be further reduced.

In addition, the second optical layer of the multilayer optical film structure of the present invention is composed of three structural layers. Even if there are no bubbles inside the first optical structure (or the second optical structure), the refraction, reflection and scattering of the light beam can be increased. This achieves the effect of diffusing the beam.

The contents disclosed above are only preferred and feasible embodiments of the present invention, and do not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

1A: Optical film structure 10: Basal layer 10a: First surface 10b: Second surface 11: First optical structure 12: Second optical structure 121: First structural layer 122:Second structural layer 123: The third structural layer d1~d4: distance θ1~θ4: angle S1~S3: Inclined surface

Claims (16)

A multilayer optical film structure, which includes: a base layer having a first surface and a second surface opposite to the first surface; a first optical structure disposed on the first surface of the base layer surface; and a second optical structure, which is provided on the second surface of the base layer and includes a first structural layer, a second structural layer and a third structural layer, wherein the first structure The layer is located between the base layer and the second structural layer, and the second structural layer is located between the first structural layer and the third structural layer; wherein the refraction of the first structural layer The refractive index difference between the refractive index and the second structural layer is greater than or equal to 0.1; wherein the first optical structure has a plurality of first sharp corners, the first structural layer has a plurality of second sharp corners, and the second The structural layer has a plurality of third sharp corners, and the third structural layer has a plurality of fourth sharp corners. The angles of the first sharp corners and the angles of the fourth sharp corners are both larger than the second sharp corners. The angle is the angle with the third sharp angle. The multilayer optical film structure according to claim 1, wherein the first structural layer and the second structural layer include a pyramid structure or a triangular prism structure. The multilayer optical film structure according to claim 2, wherein the pyramid structure is a three-sided concave pyramid structure or a four-sided concave pyramid structure. The multilayer optical film structure according to claim 2, wherein the pyramid structure is a three-sided convex pyramid structure or a four-sided convex pyramid structure. The multilayer optical film structure according to claim 1, wherein the light incident surface of the multilayer optical film structure includes a plurality of inclined planes, and two connected inclined planes form an included angle. The multilayer optical film structure according to claim 1, wherein the surface of the third structural layer includes a plurality of third inclined planes, and each two connected third inclined planes jointly form a fourth included angle. The multilayer optical film structure according to claim 1, wherein the angle between the first sharp angle and the fourth sharp angle is 70 to 100 degrees. The multilayer optical film structure according to claim 1, wherein the angle between the second sharp angle and the third sharp angle is 40 to 60 degrees. A method for manufacturing the multilayer optical film structure as claimed in claim 1, which sequentially includes: forming the base layer; forming the first optical structure on the first surface of the base layer; A first structural layer is formed on the second surface of the base layer; the second structural layer is formed on the first structural layer; and the third structural layer is formed on the second structural layer superior. A method for manufacturing the multilayer optical film structure as claimed in claim 1, which sequentially includes: forming the base layer; forming the first structural layer on the second surface of the base layer; A first optical structure is formed on the first surface of the base layer; the second structural layer is formed on the first structural layer; and the third structural layer is formed on the second structural layer superior. A method for manufacturing the multilayer optical film structure as claimed in claim 1, which sequentially includes: forming the base layer; forming the first structural layer on the second surface of the base layer; A second structural layer is formed on the first structural layer; the first optical structure is formed on the first surface of the base layer; to and forming the third structural layer on the second structural layer. A method for manufacturing the multilayer optical film structure as claimed in claim 1, which sequentially includes: forming the base layer; forming the first structural layer on the second surface of the base layer; A second structural layer is formed on the first structural layer; the third structural layer is formed on the second structural layer; and the first optical structure is formed on the first part of the base layer. surface. The method according to any one of claims 9 to 12, wherein the first optical structure, the first structural layer, the second structural layer and the third structural layer are formed by rollers or molds. Made by press molding. The method according to any one of claims 9 to 12, wherein the light incident surface of the multilayer optical film structure includes a plurality of inclined planes, and two connected inclined planes form an included angle. The method according to any one of claims 9 to 12, wherein the surface of the third structural layer includes a plurality of third bevels, and each two connected third bevels jointly form a fourth bevel. angle. The method of claim 14, wherein the angle between the first sharp corner and the fourth sharp corner is 70 to 100 degrees, and the angle between the second sharp corner and the third sharp corner is 40 to 100 degrees. 60 degrees.

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