Thin film and backlight module

Abstract

The utility model provides a thin film and backlight module, the thin film includes base material layer and structural layer, structural layer is fixed on base material layer, structural layer includes a plurality of rectangular pyramid, and the rectangular pyramid protrudes from structural layer's one side away from base material layer towards the direction away from base material layer. A plurality of rectangular pyramids are arranged on the side, away from the base material layer, of the structural layer, when light enters the rectangular pyramids, the light can be refracted when passing through the 1 / 3 faces of the rectangular pyramids, and at the moment, the light in the X-axis direction is gathered; when the light passes through the 2 / 4 surface of the rectangular pyramid, the light in the Y-axis direction can be gathered, so that the rectangular pyramid of the structural layer can simultaneously realize light angle shrinkage on the light in the two axial directions, the film has an omnibearing brightness enhancement effect, the film has a good brightness enhancement effect, the film can replace a traditional double-layer brightness enhancement film, and the brightness of the film is improved. The composition structure of the backlight module can be reduced, the production cost of the backlight module is reduced, and the brightness of the backlight module is improved.

Description

Technical Field

[0001] The utility model relates to the field of Mini LED display technology, and in particular to a film and a backlight module. Background Art

[0002] Traditional brightness enhancement film is suitable for LCD display modules of various sizes such as mobile phone displays, LCD TVs, and commercial large screens. The brightness enhancement film mainly changes the angular distribution of light. The structure of the brightness enhancement film includes a substrate layer and a prism layer. The prism layer is a triangular prism distributed in parallel. When light enters these prism angles, only about 37% of the light will be refracted into small-angle light (within the range of ±35°), and some will become large-angle light and be wasted. Moreover, a brightness enhancement film can only work on light in one axis. Two prisms with vertical distribution are needed to gather the light in two axes to achieve a higher brightness improvement. At present, Mini and MicroLED backlight modules are becoming more and more popular and widely used. Mini and MicroLED are chip-emitting, and there is no cup mouth to perform optical processing on the light output. The axial light is large, and the traditional brightness enhancement film is not ideal for improving the brightness of Mini and MicroLED backlight modules. Utility Model Content

[0003] The embodiments of the utility model provide a film and a backlight module to improve the brightness enhancement effect of the film, thereby improving the brightness of the backlight module.

[0004] The utility model provides a film, which comprises:

[0005] substrate layer;

[0006] The structural layer is fixedly arranged on the substrate layer. The structural layer comprises a plurality of quadrangular pyramids. The quadrangular pyramids are protruded from a side surface of the structural layer away from the substrate layer toward a direction away from the substrate layer.

[0007] In the film provided by the utility model, the plurality of quadrangular pyramids are distributed in an array.

[0008] In the film provided by the utility model, the bottom side edges of adjacent quadrangular pyramids are connected.

[0009] In the film provided by the utility model, the distance between the vertices of adjacent quadrangular pyramids is 40-60 mm.

[0010] In the film provided by the utility model, the vertex angle of the quadrangular pyramid is between 80° and 100°.

[0011] In the film provided by the utility model, the vertex angle of the quadrangular pyramid is 90°.

[0012] In the film provided by the utility model, the side surfaces of the quadrangular pyramids are all configured as microstructured surfaces.

[0013] In the film provided by the utility model, the side surfaces of the quadrangular pyramid are arranged in sections.

[0014] In the film provided by the utility model, the outer side surface of the quadrangular pyramid is coated with an epoxy resin layer.

[0015] The utility model also provides a backlight module, which includes:

[0016] The film is any one of the films described above.

[0017] The utility model provides a film and a backlight module, the film includes a substrate layer and a structural layer, the structural layer is fixed on the substrate layer, the structural layer includes a plurality of quadrangular pyramids, the quadrangular pyramids are protruded from the side of the structural layer away from the substrate layer toward the direction away from the substrate layer. The application provides a plurality of quadrangular pyramids on the side of the structural layer away from the substrate layer, when light enters the quadrangular pyramids, the light will be refracted when passing through 1 / 3 of the quadrangular pyramid, at this time, the light in the X-axis direction is gathered; when the light passes through 2 / 4 of the quadrangular pyramid, the light in the Y-axis direction is gathered, therefore, the quadrangular pyramids of the structural layer can simultaneously realize the light angle contraction for the light in two axes, and have an all-round brightness enhancement effect, therefore, the film has a good brightening effect, the film can replace the traditional double-layer brightness enhancement film, can reduce the composition structure of the backlight module, also reduce the production cost of the backlight module, and improve the brightness of the axial viewing angle of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural diagram of the film in the embodiment of the utility model;

[0020] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 A top view of a film in an embodiment of the utility model;

[0022] Figure 4 A side view of a film in an embodiment of the utility model;

[0023] The reference numerals in the figures are:

[0024] 100, structural layer; 110, quadrangular pyramid; 111, vertex; 112, side. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0026] Reference Figures 1 to 4 , which shows an embodiment of the film of the utility model. The film comprises a substrate layer and a structural layer 100, wherein the structural layer 100 is fixedly arranged on the substrate layer, and the structural layer 100 comprises a plurality of quadrangular pyramids 110, wherein the quadrangular pyramids 110 are protruded from a side surface 112 of the structural layer 100 away from the substrate layer in a direction away from the substrate layer.

[0027] Specifically, the brightness enhancement film changes the angular distribution of light, thereby converging the light source and improving the brightness of the backlight module. Traditional brightness enhancement films are suitable for liquid crystal display modules of various sizes, such as mobile phone displays, LCD TVs, and commercial large screens. The current brightness enhancement film structure includes a substrate layer and a prism layer. The prism layer is a triangular prism distributed in parallel. When light enters these prism angles, only about 37% of the light will be refracted into small-angle light, and some will become large-angle light and be wasted. In addition, the current brightness enhancement film can only act on light in one axis. Therefore, two prisms with vertically distributed brightness enhancement films are needed to converge light in two axes, thereby achieving a higher brightness increase. However, the current Mini LED or Micro LED backlight modules are becoming more and more popular and are used more and more widely. Since Mini LED or Micro LED emits light from chips, there is no cup mouth to perform optical processing on the output light, and the axial light is large. The traditional brightness enhancement film is not ideal for improving the brightness of the Mini LED or Micro LED backlight module.

[0028] Therefore, the present application provides a film, which can be used as a brightness enhancement film for a traditional LED light source, a Mini LED light source or a Micro LED light source, wherein the film comprises a substrate layer and a structural layer 100, wherein the structural layer 100 is coated on the substrate layer, the substrate layer is located above the light source, the substrate layer plays a supporting role and is used to increase the thickness of the film; the structural layer 100 comprises a plurality of quadrangular pyramids 110, wherein the quadrangular pyramids 110 are protruded from a side surface 112 of the structural layer 100 away from the substrate layer in a direction away from the substrate layer. Wherein, the substrate layer and the structural layer 100 are both made of PET.

[0029] In the present application, a plurality of tetrahedrons 110 are provided on the side of the structural layer 100 away from the substrate layer. When light enters the tetrahedron 110, the light will be refracted when passing through 1 / 3 of the surface of the tetrahedron 110, and the light in the X-axis direction will be gathered at this time; when the light passes through 2 / 4 of the surface of the tetrahedron 110, the light in the Y-axis direction will be gathered. Therefore, the tetrahedron 110 of the structural layer 100 can simultaneously realize the light angle contraction for the light in two axes, and has an all-round brightness enhancement effect. Therefore, the film has a good brightening effect. The film can replace the traditional double-layer brightening film, which can not only reduce the component structure of the backlight module, but also reduce the production cost of the backlight module and improve the brightness of the axial viewing angle of the backlight module.

[0030] In particular, the structural layer 100 is configured as an integrated structure, that is, the plurality of quadrangular pyramids 110 are designed as an integrated structure, thereby improving the structural stability of the film and facilitating the production of the film.

[0031] In one embodiment, referring to Figures 1 to 4 As shown, the plurality of quadrangular pyramids 110 are distributed in an array. Specifically, the plurality of quadrangular pyramids 110 are arranged in an array distribution structure, that is, the plurality of quadrangular pyramids 110 are neatly arranged in rows and columns. The plurality of quadrangular pyramids 110 are orderly arranged on a side 112 of the structural layer 100 away from the substrate layer according to a neat array structure. The plurality of quadrangular pyramids 110 are evenly arranged in each row and each column, thereby improving the structural stability of the structural layer 100 and improving the light gathering of the quadrangular pyramids 110, thereby enhancing the brightening effect of the film; at the same time, it is convenient to arrange the plurality of quadrangular pyramids 110 on the structural layer 100, saving production costs. Among them, the quadrangular pyramids 110 are made of PET material, and the distribution of the quadrangular pyramids 110 does not need to correspond one-to-one with the center position of the Mini LED chip or the Micro LED chip, thereby facilitating the design of the position of the quadrangular pyramids 110.

[0032] In a specific embodiment, refer to Figures 1 to 4As shown, the sides of the bottom surfaces of adjacent quadrangular pyramids 110 are connected. Specifically, the plurality of quadrangular pyramids 110 are distributed in an array structure on the side of the structural layer 100 away from the substrate layer, and the sides of the bottom surfaces of adjacent quadrangular pyramids 110 are connected, that is, the plurality of quadrangular pyramids 110 are arranged closely, and the sides of the bottom surfaces of adjacent quadrangular pyramids 110 are in a connected state, so that the plurality of quadrangular pyramids 110 are neatly arranged on the structural layer 100, and there is no gap on the structural layer 100, thereby increasing the distribution area of ​​the quadrangular pyramids 110, thereby ensuring that when light passes through the substrate layer to the structural layer 100, most of it can be gathered by the quadrangular pyramids 110, thereby enhancing the brightening effect of the film, and finally improving the brightness of the backlight module.

[0033] In one embodiment, referring to Figures 1 to 4 As shown, the spacing between the vertices 111 of the adjacent quadrangular pyramids 110 is 40-60 mm. Specifically, the vertex 111 of the quadrangular pyramid 110 refers to the vertex 111 relative to the bottom surface of the quadrangular pyramid 110, the common vertex 111 of the four side surfaces 112 of the quadrangular pyramid 110, that is, the highest vertex 111 of the quadrangular pyramid 110; the spacing between the vertices 111 of the adjacent quadrangular pyramids 110 is designed to be 40-60 mm, so as to ensure the distance between the several quadrangular pyramids 110. Under the spacing, the several quadrangular pyramids 110 are evenly distributed on the structural layer 100, and the number of the quadrangular pyramids 110 is increased as much as possible, which further ensures that the quadrangular pyramids 110 gather light and improves the brightening effect of the film.

[0034] In a specific embodiment, the vertex angle of the quadrangular pyramid 110 is between 80° and 100° (not shown in the figure). Specifically, the vertex angle of the quadrangular pyramid 110 refers to the angle formed between two opposite side surfaces 112 at the common vertex 111 of the four side surfaces 112 of the quadrangular pyramid 110. The quadrangular pyramid 110 has two vertex angles. The vertex angle of the quadrangular pyramid 110 is set between 80° and 100°, so that the quadrangular pyramid 110 has a better light gathering effect. The quadrangular pyramid 110 can enhance the brightness in all directions, and enhance the brightening effect of the quadrangular pyramid 110 on the brightness of the axial viewing angle of the backlight module, thereby further improving the brightening effect of the film on the backlight module and improving the brightness of the backlight module.

[0035] In one embodiment, the vertex angle of the quadrangular pyramid 110 is 90° (not shown in the figure). Specifically, the vertex angle of the quadrangular pyramid 110 refers to the angle formed between two opposite side surfaces 112 at the common vertex 111 of the four side surfaces 112 of the quadrangular pyramid 110. The quadrangular pyramid 110 has two vertex angles. The vertex angle of the quadrangular pyramid 110 is set to 90°. The quadrangular pyramid 110 at the vertex angle has a better light gathering effect, thereby further improving the brightening effect of the film on the backlight module, improving the brightness of the backlight module, and improving the structural stability of the quadrangular pyramid 110.

[0036] In particular, the tetrahedron 110 in the present embodiment is a regular tetrahedron 110. Since the light distribution in the X-axis and Y-axis directions of a general LED light output is consistent, the tetrahedron 110 is set as a regular tetrahedron 110, which further improves the focusing effect of the tetrahedron 110, improves the brightening effect of the film, and is simple to produce.

[0037] In a specific embodiment, the side surfaces 112 of the quadrangular pyramid 110 are all provided with microstructured surface types (not shown in the figure). Specifically, the side surfaces 112 of the quadrangular pyramid 110 refer to the other four side surfaces 112 of the quadrangular pyramid 110 except the bottom surface; the microstructured surface type refers to modulating the light source, establishing a set of equations based on Snell's law and the principle of edge light, and iterating the set of equations to obtain the microstructured surface type of the side surface 112 of the quadrangular pyramid 110. The microstructured surface type can be a sawtooth surface, a circular surface, a diamond surface, an oblique surface or other polynomial surface types, and different microstructured surface types correspond to different reflection and refraction effects. Therefore, the surface type of the four sides 112 of the quadrangular pyramid 110 is specially processed, that is, they are all set to microstructure surface type, and the four sides 112 are designed according to different light source types and different light type distributions of the backlight module. The microstructure surface type can be defined arbitrarily, that is, the four sides 112 of the quadrangular pyramid 110 can be the same at the same time, or different at the same time, or partially the same or partially different microstructure surface types. Users can customize the settings according to actual needs and adjust the surface type of the side 112 of the quadrangular pyramid 110 for different light sources, so as to achieve better focusing effect according to the actual light source conditions and achieve better brightness effect of the backlight module; the microstructure surface type can be suitable for Mini LED and Micro LED light sources with large divergence angles, and finally achieve higher brightness gain. In this embodiment, the microstructure surface type can be a sawtooth shape similar to a Fresnel lens to increase the focusing effect of the quadrangular pyramid 110, thereby improving the brightening effect of the film.

[0038] In one embodiment, the side surface 112 of the quadrangular pyramid 110 is segmented (not shown in the figure). Specifically, the four side surfaces 112 of the quadrangular pyramid 110 are all set as microstructure surface types according to the actual light source conditions, and the four side surfaces 112 of the quadrangular pyramid 110 are all segmented. The segmented setting refers to segmenting the side surface 112 of the quadrangular pyramid 110 along the direction parallel to the side edge of the bottom surface of the quadrangular pyramid 110. The segmented setting refers to segmenting the distribution of incident light on the side surface 112 of the quadrangular pyramid 110, and different microstructure surface types are designed for different segmented positions of the side surface 112 of the quadrangular pyramid 110, thereby further improving the focusing effect of the quadrangular pyramid 110 and improving the brightening effect of the film.

[0039] In a specific embodiment, an epoxy resin layer (not shown in the figure) is coated on the outer surface of the tetrahedral pyramid 110. Specifically, the epoxy resin is a high molecular polymer, which refers to a general term for a class of polymers containing two or more epoxy groups in the molecule. It is a condensation product of epichlorohydrin and bisphenol A or polyols. Due to the chemical activity of the epoxy group, it can be opened with a variety of compounds containing active hydrogen, cured and cross-linked to form a network structure, so it is a thermosetting resin. The epoxy resin has excellent chemical resistance, especially alkali resistance, strong paint film adhesion, especially to metal, has good heat resistance and electrical insulation, and good paint film color retention. The epoxy resin is known as a universal glue. The outer surface of the quadrangular pyramid 110 refers to the four side surfaces 112 of the quadrangular pyramid 110. An epoxy resin layer is coated on the outer surface of the quadrangular pyramid 110. The epoxy resin is easy to cure and has good physical properties and strong adhesion after curing, thereby improving the adhesion between the quadrangular pyramid 110 and other structures, that is, improving the adhesion between the structural layer 100 and other structures.

[0040] The present application also provides a backlight module (not shown in the figure), which includes a film, and the film is any of the films described above. Since the film is described in detail in the above embodiments, it will not be repeated here.

[0041] Since the backlight module adopts the film in this embodiment, the film has a simple structure, improves the brightness of the axial viewing angle, achieves a higher brightness gain, and has a strong brightening effect, so it can replace the traditional double-layer brightening film to reduce the component structure of the backlight module, improve the brightness of the backlight module, and reduce production costs.

[0042] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A film, characterized in that: include: substrate layer; The structural layer is fixedly arranged on the substrate layer. The structural layer comprises a plurality of quadrangular pyramids. The quadrangular pyramids are protruded from a side surface of the structural layer away from the substrate layer toward a direction away from the substrate layer.

2. The film according to claim 1, characterized in that The plurality of quadrangular pyramids are distributed in an array.

3. The film according to claim 2, characterized in that The sides of the base surfaces of adjacent quadrangular pyramids are connected.

4. The film according to any one of claims 1 to 3, characterized in that: The distance between the vertices of adjacent quadrangular pyramids is 40-60 mm.

5. The film according to any one of claims 1 to 3, characterized in that: The vertex angle of the quadrangular pyramid is between 80° and 100°.

6. The film according to claim 5, characterized in that The vertex angle of the quadrangular pyramid is 90°.

7. The film according to claim 1, characterized in that The side surfaces of the quadrangular pyramids are all configured as microstructure surfaces.

8. The film according to claim 7, characterized in that The side surfaces of the quadrangular pyramid are arranged in sections.

9. The film according to claim 1, characterized in that The outer side surface of the quadrangular pyramid is coated with an epoxy resin layer.

10. A backlight module, characterized in that: include: The film is the film according to any one of claims 1 to 9.

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