Diffusion film and backlight source module

Abstract

The utility model provides a diffusion film, and relates to the technical field of liquid crystal screen light source assemblies. Comprising a PET base material layer, a mirror surface bottom film layer is attached to the back face of the PET base material layer, and a matte diffusion layer is attached to the front face of the PET base material layer; the mirror surface bottom film layer is a one-way perspective film, and the mirror surface of the mirror surface bottom film layer faces the PET base material layer; micro-convex or micro-concave structures are uniformly distributed on the matte diffusion layer; the curvature d of the micro convex surface or the micro concave surface meets 0 lt; dlt; 2 mm. The problems of thickness, light transmittance, energy consumption and the like caused by the fact that two layers of diffusion films are used in an existing backlight module are solved, multiple losses of light are reduced, the light transmittance is improved, dependence on light source power is reduced, energy conservation and environmental protection are facilitated, needed materials and machining steps are reduced, and control over the manufacturing cost is facilitated; the light can be uniformly diffused, and the brightness uniformity of the screen is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal screen light source components, in particular to a diffusion film and a backlight source module. Background Art

[0002] With the development of science and technology, display screens, as important electronic devices, have played an important role in production and life. LCD screens are now the mainstream display screens, and their brightness and clarity are getting better and better.

[0003] In the structure of the LCD screen, the light source is an important component and has a great influence on the image display effect, and its backlight structure is its main light source. Its backlight source is mainly composed of the light source part, reflective film, light-transmitting film, upper and lower diffusion films, and upper and lower brightness enhancement films.

[0004] In the current backlight module, in order to make the light more uniform, two diffusion films are generally used, that is, the upper and lower diffusion films are stacked together, which increases the thickness of the diffusion film. Moreover, since the light transmittance of the diffusion film is generally between 70% and 80%, after being stacked twice, its overall light transmittance will further decrease. When the brightness of the screen needs to be increased, the power of the light source needs to be further increased, which is not conducive to energy saving. Moreover, the thickness and cost are increased after the two pieces are stacked. Therefore, the utility model proposes a diffusion film and a backlight module to at least partially solve the problems that may exist in the prior art. Utility Model Content

[0005] In order to overcome the above problems or at least partially solve the above problems, the embodiments of the present invention provide a diffusion film and a backlight module to at least partially solve the problems that may exist in the prior art.

[0006] The embodiment of the utility model is achieved as follows:

[0007] The present application provides a diffusion film, comprising:

[0008] The PET substrate layer has a mirror surface bottom film layer laminated on its back side and a matte surface diffusion layer laminated on its front side;

[0009] The mirror bottom film layer is a one-way perspective film, and its mirror surface faces the PET substrate layer;

[0010] The matte diffusion layer is uniformly distributed with micro-convex or micro-concave structures; and the curvature d of the micro-convex or micro-concave surface satisfies 0 <d<2mm。

[0011] In some embodiments of the present invention, the matte diffusion layer has a black silk-screen printing area of ​​0.8 mm.

[0012] In some embodiments of the present utility model, a light source shielding strip is connected to the bottom of the matte diffusion layer, and at least one side facing the mirror bottom film layer is white; there is a black glue stamping area where the light source shielding strip and the black silk printing area overlap by 0.5 mm.

[0013] In some embodiments of the present utility model, the light source shielding strip is made of black and white single-sided adhesive, and the side facing the same direction as the front of the matte diffusion layer is black, and the other side is white.

[0014] In some embodiments of the present utility model, a first positioning piece extends outward from the edge of the diffusion film.

[0015] An embodiment of the present application further provides a backlight module, including an outer frame, and an upper light enhancement film, a lower light enhancement film, a diffusion layer, a light transmissive layer, and a reflective film are sequentially stacked in the outer frame from top to bottom;

[0016] A light source is disposed on one side of the light transmissive layer; the diffusion layer is a diffusion film.

[0017] In some embodiments of the present utility model, a positioning groove is provided on the inner edge of the outer frame; the positioning groove corresponds to the position of the first positioning piece on the diffusion film.

[0018] In some embodiments of the present utility model, both the upper light enhancement film and the lower light enhancement film are provided with second positioning pieces having the same position and size as the first positioning piece.

[0019] In some embodiments of the present utility model, the light source is electrically connected to an FPC, and the FPC extends from a hole in the outer frame to the outside thereof.

[0020] Compared with the prior art, the embodiments of the present utility model have at least the following advantages or beneficial effects:

[0021] Through a PET substrate layer, a mirror bottom film layer is attached to the back thereof, and a matte diffusion layer is attached to the front thereof; the mirror bottom film layer is a one-way perspective film, and its mirror surface faces the PET substrate layer; the matte diffusion layer is uniformly distributed with micro-convex or micro-concave surface structures; and the curvature d of the micro-convex or micro-concave surface satisfies 0 < d < 2 mm. It solves the problems of thickness, light transmittance, and energy consumption faced by using two diffusion films in the current backlight module. By reducing the multiple losses of light, the light transmittance is improved, the dependence on the light source power is reduced, which is beneficial to energy conservation and environmental protection, reduces the required materials and processing steps, helps to control the manufacturing cost, and through the micro-convex or micro-concave surface structure, the light can be evenly diffused, improving the brightness uniformity of the screen. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the front structure of a diffusion membrane provided in one embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the back structure of a diffusion membrane provided in one embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the hierarchical structure of a diffusion membrane provided in one embodiment of the utility model;

[0026] Figure 4 A schematic diagram of a micro-concave structure of a matte diffusion layer of a diffusion membrane provided in one embodiment of the utility model;

[0027] Figure 5 A schematic diagram of a micro-convex structure of a matte diffusion layer of a diffusion membrane provided in one embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the front structure of a backlight module provided in one embodiment of the utility model;

[0029] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure of part A;

[0030] Figure 8 A schematic cross-sectional structure diagram of a backlight module provided in one embodiment of the utility model;

[0031] Fig. 9 for Figure 8 Schematic diagram of the three-dimensional structure of part B.

[0032] In the figure: 101, PET substrate layer; 102, mirror bottom film layer; 103, matte diffusion layer; 104, light source shielding strip; 105, first positioning sheet; 106, black silk screen area; 107, black glue embossing area; 201, outer frame; 202, reflective film; 203, light-transmitting layer; 204, diffusion layer wheel; 205, lower brightness enhancement sheet; 206, upper brightness enhancement sheet; 207, FPC; 208, positioning groove. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0034] Embodiment 1

[0035] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. Without conflict, the various embodiments and the various features in the embodiments can be combined with each other.

[0036] Please refer to Figures 1 to 5 As shown, the embodiment of the present utility model provides a diffusion film, which includes: a PET substrate layer 101, a mirror bottom film layer 102 is attached to the back surface thereof, and a matte diffusion layer 103 is attached to the front surface thereof; the mirror bottom film layer 102 is a one-way perspective film, and its mirror surface faces the PET substrate layer 101; the matte diffusion layer 103 is evenly distributed with micro-convex or micro-concave surface structures; and the curvature d of the micro-convex or micro-concave surface satisfies 0 < d < 2 mm. The above PET substrate layer 101 is a substrate layer made of polyethylene terephthalate material.

[0037] In this embodiment, the above diffusion film includes a PET substrate layer 101, a mirror bottom film layer 102, and a matte diffusion layer 103. Among them, the mirror bottom film layer 102 is a one-way perspective film, and the matte diffusion layer 103 is evenly distributed with micro-convex or micro-concave surface structures, and its curvature satisfies 0 < d < 2 mm. When light irradiates from the mirror bottom film layer 102, since it is one-way light-transmitting, the light cannot be transmitted in the reverse direction, and its mirror effect enables it to be further reflected forward. The light passes through the above PET substrate layer 101 and is then diffused by the diffusion layer 103 with micro-convex or micro-concave surfaces, such as Figure 4 and Figure 5As shown, a micro-convex or micro-concave surface structure with a curvature satisfying 0 < d < 2 mm can help diffuse light, enabling the light to be more evenly distributed after passing through the diffusion layer. This reduces the phenomenon of uneven brightness in the backlight source, improves the consistency and visual comfort of the overall display effect, and helps scatter the light, reducing the light spots and mosaic effects that appear on the surface of the liquid crystal screen, and improving the clarity and visibility of the display. Only one layer of the above diffusion film is needed, which solves the problems of poor light transmittance and high cost caused by the need to use two layers in the current backlight module. The diffusion layer with the above micro-convex or micro-concave surface structure has a lower cost. It also solves the problem of the current backlight module using two layers of diffusion films, which increases the thickness and reduces the light transmittance, resulting in the need to further increase the light source power. Specifically, the above mirror bottom film layer 102 uses a one-way perspective film to guide the light to a specific direction, and the matte diffusion layer 103 uses a uniformly distributed micro-convex or micro-concave surface structure, which helps to diffuse the light more evenly, reduces the need to use two layers of diffusion films, and reduces the dependence on the second layer of diffusion film. In addition, the use of the one-way perspective film reduces the loss of energy between multiple layers, helps to improve the overall light transmittance, reduces the power requirement, reduces the necessity of using two layers of diffusion films, thereby reducing the overall thickness and manufacturing cost, and is also conducive to reducing the thickness of the overall backlight module, meeting the requirements of thin and light design.

[0038] Embodiment 2

[0039] An embodiment of the present utility model provides a diffusion film, which includes that the matte diffusion layer 103 has a black silk screen area 106 of 0.8 mm.

[0040] By increasing the black silk screen area 106 in the matte diffusion layer 103, it can effectively prevent the interference and reflection of external light, reduce the reflection problem of the screen in a strong light environment, improve the visibility of the screen, and can also selectively absorb or reflect light, which helps to more precisely control the brightness and color performance of the screen, and improve the accuracy and stability of the display effect.

[0041] As a preferred implementation manner, a light source blocking strip 104 is connected to the bottom of the matte diffusion layer 103, and at least one side facing the mirror bottom film layer 102 is white; the light source blocking strip 104 and the black silk screen area 106 have a black glue imprinting area 107 that overlaps by 0.5 mm. Through the above light source blocking strip 104, light leakage from the edge position can be prevented.

[0042] As a preferred implementation manner, the light source blocking strip 104 is made of black and white single-sided adhesive, and the side facing the same direction as the front of the matte diffusion layer 103 is black, and the other side is white; the white light source blocking strip 104 enables the light to be better reflected.

[0043] As a preferred implementation, the edge of the diffusion membrane is further extended outwardly to be provided with a first positioning piece 105 for positioning the product during production and during assembly, so as to facilitate production and assembly.

[0044] Example 3

[0045] Based on the same concept, the present utility model embodiment provides a backlight module, referring to Figures 6 to 9 As shown, it includes an outer frame 201, in which an upper brightness enhancement sheet 206, a lower brightness enhancement sheet 205, a diffusion layer 204, a light-transmitting layer 203 and a reflective film 202 are stacked in sequence from top to bottom; a light source is arranged on one side of the light-transmitting layer 203; and the diffusion layer 204 is the above-mentioned diffusion film.

[0046] By using the above-mentioned diffusion film as the diffusion layer 204 of the above-mentioned backlight source module, only one layer of diffusion film is used as the diffusion layer 204, which solves the problem that the current backlight module needs to use two layers, resulting in poor light transmittance and high cost, and solves the problem that the current use of double-layer diffusion film increases thickness and reduces light transmittance. When using the same light source, the brightness of the display can be improved.

[0047] Example 4

[0048] Based on the same concept, the embodiment of the utility model provides a backlight module, wherein the inner edge of the outer frame 201 is provided with a positioning groove 208; the positioning groove 208 corresponds to the position of the first positioning piece 105 on the diffusion film. Through the positioning groove 208, in conjunction with the first positioning piece 105, the diffusion film can be more stably installed in the outer frame 201, preventing the diffusion film from being offset in the outer frame 201.

[0049] As a preferred embodiment, the upper brightness enhancement sheet 206 and the lower brightness enhancement sheet 205 are both provided with a second positioning sheet having the same position and size as the first positioning sheet 105. The second positioning sheet enables the upper brightness enhancement sheet 206 and the lower brightness enhancement sheet 205 to be better installed in the outer frame 201.

[0050] As a preferred embodiment, the light source is electrically connected to a FPC207 (Flexible Printed Circuit), and the FPC207 extends from the hole of the outer frame 201 to the outside thereof. The FPC207 can be bent and folded on surfaces of different shapes and sizes, and has good impact resistance and vibration resistance, and has high reliability. In addition, the FPC207 also has excellent electrical properties, including low loss, low crosstalk and other characteristics.

[0051] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. Although optional embodiments of the utility model embodiments have been described, once those skilled in the art know the basic creative concept, they can make additional changes and modifications to these embodiments. Therefore, the attached claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0052] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0053] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A diffusion membrane, characterized in that: include: A PET substrate layer (101) having a mirror-surface bottom film layer (102) laminated on its back side and a matte-surface diffusion layer (103) laminated on its front side; The mirror bottom film layer (102) is a one-way perspective film, and its mirror surface faces the PET substrate layer (101); The matte diffusion layer (103) is uniformly distributed with micro-convex or micro-concave structures; and the curvature d of the micro-convex or micro-concave surface satisfies 0 <d<2mm。 2. The diffusion membrane according to claim 1, characterized in that The matte diffusion layer (103) has a 0.8 mm black silk-screen printing area (106).

3. The diffusion membrane according to claim 2, characterized in that The bottom of the matte diffusion layer (103) is connected to a light source shielding strip (104), at least one side of which is white and faces the mirror bottom film layer (102); the light source shielding strip (104) and the black silk-screen area (106) have a black glue embossed area (107) that overlaps by 0.5 mm.

4. The diffusion membrane according to claim 3, characterized in that The light source shielding strip (104) is made of black and white single-sided adhesive, and the side thereof facing the same front side as the matte diffusion layer (103) is black, and the other side is white.

5. The diffusion membrane according to claim 1, characterized in that A first positioning piece (105) is also provided on the edge of the diffusion membrane extending outward.

6. A backlight module, characterized in that: It comprises an outer frame (201), wherein an upper brightness enhancement sheet (206), a lower brightness enhancement sheet (205), a diffusion layer (204), a light-transmitting layer (203) and a reflective film (202) are sequentially stacked in the outer frame from top to bottom; A light source is arranged on one side of the light-transmitting layer (203); and the diffusion layer (204) is the diffusion film according to any one of claims 1 to 5.

7. The backlight module according to claim 6, characterized in that: A positioning groove (208) is provided on the inner edge of the outer frame (201); the positioning groove (208) corresponds to the position of the first positioning piece (105) on the diffusion membrane.

8. The backlight module according to claim 7, characterized in that: The upper brightness enhancement sheet (206) and the lower brightness enhancement sheet (205) are both provided with a second positioning sheet having the same position and size as the first positioning sheet (105).

9. The backlight module according to claim 6, characterized in that: The light source is electrically connected to an FPC (207), and the FPC (207) extends from a hole in the outer frame (201) to the outside thereof.

Images