High-transmittance gain type diffusion film

Abstract

The utility model discloses a high-transmittance gain type diffusion film which comprises a base material layer, a diffusion layer is arranged on the upper surface of the base material layer, the diffusion layer is of a structure which is composed of a plurality of diffusion particles with different particle sizes and has height difference, a prism layer is arranged on the lower surface of the base material layer, and the prism layer is composed of a plurality of prism structures with the same or different shapes. Wherein the base material layer is a PET or PC light-transmitting layer, and the thickness h of the base material layer is 10-100 [mu] m or 100-250 [mu] m; the coating is an AR coating; the diffusion layer is formed through diffusion particle coating or UV transfer printing or hot pressing, and the height difference L of diffusion particles is larger than or equal to 4 micrometers. The distance P between the top ends of every two adjacent prism structures is 4-200 microns, the height of each prism structure is H + delta H, and H is 2-100 microns, 0 lt; [delta] Hlt; h / 2. According to the structural design, the diffusion brightness gain of the diffusion film is larger than or equal to 4%, the gain is large, and the diffusion film has high penetrability.

Description

A high-transmittance gain diffusion film Technical Field

[0001] This utility model relates to the field of diffusion membrane technology, specifically to a high-transmittance gain type diffusion membrane. Background Technology

[0002] A diffusion film is a new type of high-performance optical material used in TFT LCD backlight modules to diffuse light as it passes through the diffusion coating, thereby uniformly distributing the light and converting point or line light sources into surface light sources.

[0003] With intensifying market competition, backlight brightness, as one of the important indicators of backlight modules, has made "ultra-high brightness" a key selling point for 3C products.

[0004] As an important component of the backlight module, how to utilize the diffusion film to improve the brightness of the entire backlight module is a current research direction.

[0005] The current diffusion film has a diffusion brightness gain of less than 4%, which is not significant and has limited impact on the backlight module. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-transmittance, high-gain diffusion film.

[0007] The technical solution of this utility model is as follows:

[0008] A high-transmittance, high-gain diffusion film includes a substrate layer, on the upper surface of which a diffusion layer is adhered by a coating. The diffusion layer is a structure with height differences composed of several diffusion particles of different sizes. A prism layer is disposed on the lower surface of the substrate layer. The prism layer is composed of several prism structures of the same or different shapes.

[0009] Furthermore, the substrate layer is a PET or PC light-transmitting layer, and its thickness h is 10-100 μm or 100-250 μm.

[0010] Furthermore, the diffusion layer is adhered to the substrate layer by a coating.

[0011] Furthermore, the coating is an AR coating.

[0012] Furthermore, the diffusion layer is formed by diffusion particle coating, UV transfer, or hot pressing.

[0013] Furthermore, the height difference L of the diffused particles in the diffusion layer is ≥ 4 μm.

[0014] Furthermore, the prism structure includes a first prism structure, a second prism structure, a third prism structure, and a fourth prism structure. The top ends of the first and second prism structures form an angle of 45° to 135°, and the top angle A1 of the first prism structure is the same as or different from the top angle A2 of the second prism structure. The top ends of the third and fourth prism structures form arcs, and the radius R1 of the arc at the top end of the third prism structure is the same as or different from the radius R2 of the arc at the top end of the fourth prism structure.

[0015] Furthermore, the distance P between the tops of two adjacent prism structures is 4–200 μm, and the height of the prism structure is H + ΔH, where H is 2–100 μm and 0 < ΔH. <H / 2。

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a diffusion layer on the upper surface of the substrate layer, which is a structure with height difference composed of several diffusion particles of different sizes, and a prism layer is provided on the lower surface of the substrate layer, which is composed of several prism structures of the same or different shapes. This structural design makes the diffusion brightness gain of the diffusion film ≥4%, which is a large gain, and at the same time has high penetration. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the structure of a high-transmittance, high-gain diffusion membrane provided by this utility model;

[0019] Figure 2 is a schematic diagram showing the dimensions of a high-transmittance, high-gain diffusion film provided by this utility model.

[0020] Figure 3 is a magnified micrograph of the diffusion layer described in this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0023] Example

[0024] Please refer to Figures 1 and 2. This embodiment provides a high-transmittance, high-gain diffusion film, including a substrate layer 1. A diffusion layer 3 is adhered to the upper surface of the substrate layer 1 through an AR coating 2. As shown in Figure 3, the diffusion layer 3 is a structure with height differences composed of several diffusion particles of different sizes. The greater the height difference, the higher the luminance. A prism layer 4 is disposed on the lower surface of the substrate layer 1. The prism layer 4 is composed of several prism structures of the same or different shapes. The AR coating 2 enhances the transmittance of the diffusion film, the height difference structure of the diffusion layer 3 helps to improve the diffusion brightness gain, and the greater the difference in the parameters of each prism structure in the prism layer 4, the better the brightness.

[0025] Specifically, the substrate layer 1 is a PET or PC light-transmitting layer with a thickness h of 10-100 μm or 100-250 μm.

[0026] Specifically, the diffusion layer 3 is formed by coating with diffusion particles, UV transfer, or hot pressing, and the height difference of the diffusion particles L is ≥ 4 μm.

[0027] By testing different differences in the height of diffusing particles:

[0028]

[0029]

[0030] Tests show that the larger the height difference L of the diffused particles, the higher the brightness gain. When the height difference L ≥ 4 μm, the brightness gain is ≥ 4%.

[0031] Specifically, the prism structure includes a first prism structure 41, a second prism structure 42, a third prism structure 43, and a fourth prism structure 44. The tops of the first prism structure 41 and the second prism structure 42 form an angle of 45° to 135°, and the angle A1 at the top of the first prism structure 41 may be the same as or different from the angle A2 at the top of the second prism structure 42. The tops of the third prism structure 43 and the fourth prism structure 44 form arcs, and the radius R1 of the arc at the top of the third prism structure 43 may be the same as or different from the radius R2 of the arc at the top of the fourth prism structure 44. The distance P between the tops of two adjacent prism structures is 4 to 200 μm, and the height of the prism structure is H + ΔH, where H is 2 to 100 μm and 0 < ΔH. <H / 2。

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-transmittance, high-gain diffusion film, comprising a substrate layer, characterized in that: The upper surface of the substrate layer is provided with a diffusion layer, which is a structure with height difference composed of several diffusion particles of different sizes. The lower surface of the substrate layer is provided with a prism layer, which is composed of several prism structures of the same or different shapes.

2. The high-transmittance, high-gain diffusion film according to claim 1, characterized in that: The substrate layer is a PET or PC light-transmitting layer with a thickness h of 10-100 μm or 100-250 μm.

3. The high-transmittance gain diffusion film according to claim 1, characterized in that: The diffusion layer is adhered to the substrate layer by a coating.

4. The high-transmittance gain diffusion film according to claim 3, characterized in that: The coating is an AR coating.

5. The high-transmittance, high-gain diffusion film according to claim 1, characterized in that: The diffusion layer is formed by diffusion particle coating, UV transfer, or hot pressing.

6. The high-transmittance gain diffusion film according to claim 1, characterized in that: The height difference L of the diffused particles in the diffusion layer is ≥4 μm.

7. The high-transmittance gain diffusion film according to claim 1, characterized in that: The prism structure includes a first prism structure, a second prism structure, a third prism structure, and a fourth prism structure. The top ends of the first and second prism structures form an angle of 45° to 135°, and the top angle A1 of the first prism structure and the top angle A2 of the second prism structure may be the same or different. The top ends of the third and fourth prism structures form arcs, and the radius R1 of the arc at the top end of the third prism structure and the radius R2 of the arc at the top end of the fourth prism structure may be the same or different.

8. The high-transmittance, high-gain diffusion film according to claim 7, characterized in that: The distance P between the tops of two adjacent prism structures is 4–200 μm, and the height of the prism structure is H + ΔH, where H is 2–100 μm and 0 < ΔH. <H / 2。

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