Composite inverse prism diffusion film and liquid crystal display backlight module

Abstract

The utility model provides a composite inverse prism diffusion film and a liquid crystal display backlight module, and belongs to the technical field of liquid crystal displays. The composite inverse prism diffusion film comprises a transparent film base material layer, the light-out surface and the light-in surface of the transparent film base material layer are respectively provided with an atomization light-gathering layer and a reverse light-gathering brightening layer, and the atomization light-gathering layer comprises a plurality of convex hemispherical particle size structures which are arranged in an array mode. The liquid crystal display backlight module comprises a backlight source, a reflecting film, a light guide plate, a lower composite brightness enhancement film, an upper composite brightness enhancement film, a polarized light brightness enhancement film and a liquid crystal panel, the reflecting film, the light guide plate, the lower composite brightness enhancement film, the upper composite brightness enhancement film, the polarized light brightness enhancement film and the liquid crystal panel are sequentially stacked from bottom to top, the backlight source is arranged on one side of the light guide plate, and the composite inverse prism diffusion film is arranged between the light guide plate and the lower composite brightness enhancement film. The composite inverse prism diffusion film has the effects of light condensation, brightening and atomization, and the liquid crystal display backlight module applying the composite inverse prism diffusion film has the advantages of being brighter and longer in endurance time.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal displays, in particular to a composite inverse prism diffusion film and a liquid crystal display backlight module. Background Art

[0002] Liquid crystal display is a display that uses liquid crystal as material, mainly composed of a liquid crystal panel and a backlight module. The backlight module includes a light guide plate, a backlight source is arranged on one side of the light guide plate, and the light emitted by the backlight source diffuses out from the light exiting surface of the light guide plate. A lower diffusion film is arranged on the light exiting surface of the light guide plate, and a reflective film is arranged on the backlight surface. Two layers of brightness enhancement film are arranged on the lower diffusion film along the light exiting direction of the light guide plate, and the liquid crystal panel is sealed on the brightness enhancement film.

[0003] In some mobile devices, the LCD is powered by batteries. When in strong light, it is often necessary to increase the output power of the LCD to increase the brightness so that the content on the display can be seen clearly. However, increasing the output power will shorten the battery life, which makes the LCD used in some mobile devices unable to meet the needs of working in strong light for a long time. Utility Model Content

[0004] In view of the above problems, the utility model provides a composite inverse prism diffusion film and a liquid crystal display backlight module.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A composite inverse prism diffusion film is provided, comprising a transparent film substrate layer, wherein the light emitting surface and the light incident surface of the transparent film substrate layer are respectively provided with an atomized light focusing layer and a reverse light focusing brightening layer, wherein the atomized light focusing layer comprises a plurality of convex hemispherical particle size structures arranged in an array, and the reverse light focusing brightening layer comprises a plurality of V-cut prism light focusing structures which are arranged and have a sawtooth cross section.

[0007] Furthermore, the convex hemispherical particle size structure includes a base arranged on the light-emitting surface of the transparent film substrate layer, and a hemispherical first refractive surface is convexly arranged on the base.

[0008] Furthermore, the outer diameter of the convex hemispherical particle size structure in the cross section is 3 μm to 50 μm, and the height of the convex hemispherical particle size structure is 3 um to 25 um.

[0009] Furthermore, the convex hemispherical particle size structure is formed by optical grade acrylate with a low refractive index, and the refractive index of the optical grade acrylate is 1.46-1.62.

[0010] Furthermore, the V-cut prism focusing structure includes two second refractive surfaces, one end of the two second refractive surfaces is fixed to the transparent film substrate layer, and the other ends of the two second refractive surfaces are inclined in a direction away from the transparent film substrate layer and converge into a sawtooth tip.

[0011] Furthermore, the spacing between two adjacent V-cut prism focusing structures is 5 μm to 50 μm.

[0012] Furthermore, the sawtooth height of the V-cut prism focusing structure is 2.5 μm to 25 μm.

[0013] Provided is a liquid crystal display backlight module, comprising a backlight source and a reflective film, a light guide plate, a lower composite brightness enhancement film, an upper composite brightness enhancement film, a polarized brightness enhancement film and a liquid crystal panel stacked in sequence from bottom to top, wherein the backlight source is arranged on one side of the light guide plate, and the above-mentioned composite inverse prism diffusion film is arranged between the light guide plate and the lower composite brightness enhancement film.

[0014] Furthermore, an anti-scratch layer is provided between the composite inverse prism diffusion film and the light guide plate.

[0015] The beneficial effects of the utility model are:

[0016] The composite inverse prism diffusion film in the present application has a reverse focusing brightening layer on the light incident surface of the transparent film substrate layer. The reverse focusing brightening layer is composed of a plurality of uniformly arranged serrated V-cut prism focusing structures, which allows 60% of the light to penetrate and be focused and brightened, so that the light is effectively utilized, and the other 40% of the light is reflected back to the light incident side for reuse; the light emitting surface of the transparent film substrate layer is provided with an atomized focusing layer, and the convex hemispherical particle size structure on the atomized focusing layer can refract light to achieve the dual effects of light diffusion and brightening. That is: the composite inverse prism diffusion film in the present application can produce a more uniform and bright light transmission effect due to the reverse refraction and reflection and re-focusing of the serrated refractive surface of the prism structure, thereby achieving the performance of increasing brightness, and the atomized diffusion effect of the convex hemispherical particle size structure can also achieve the focusing and brightening effect. As a result, the backlight module of the liquid crystal display using the composite inverse prism diffusion film can have the advantages of being brighter and having a longer battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a composite inverse prism diffusion film according to Example 1 of the present application.

[0018] Figure 2 This is a schematic diagram of the top view structure of the atomized focusing layer of a composite inverse prism diffusion film in Example 1 of the present application.

[0019] Figure 3 This is a schematic diagram of the structure of a reverse focusing brightening layer of a composite inverse prism diffusion film in Example 1 of the present application.

[0020] Figure 4 This is an optical principle diagram of a composite inverse prism diffusion film according to Example 1 of the present application.

[0021] Figure 5 This is a schematic diagram of the overall structure of a liquid crystal display backlight module according to Example 2 of the present application.

[0022] Among them, 1. composite inverse prism diffusion film; 11. transparent film substrate layer; 12. atomized light-gathering layer; 121. base; 122. first refractive surface; 13. reverse light-gathering brightening layer; 131. second refractive surface; 2. backlight source; 3. reflective film; 4. light guide plate; 5. lower composite brightening film; 6. upper composite brightening film; 7. polarized brightening film; 8. liquid crystal panel; 9. anti-scratch layer. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Example 1

[0025] The present application embodiment discloses a composite inverse prismatic diffusion film, referring to Figure 1 , Figure 2 and Figure 3 , comprising a transparent film substrate layer 11, a light-emitting surface of the transparent film substrate layer 11 is integrally provided with an atomized light-gathering layer 12, and a light-entering surface thereof is integrally provided with a reverse light-gathering and brightening layer 13. The atomized light-gathering layer 12 comprises a plurality of convex hemispherical particle size structures arranged in an array, and the reverse light-gathering and brightening layer 13 comprises a plurality of V-cut prism light-gathering structures arranged in a zigzag cross section.

[0026] In the embodiment of the present application, when the light passes through the reverse light-concentrating and brightening layer 13, it is refracted and concentrated by the sawtooth V-cut prism light-concentrating structure, and the light-concentrating and brightening effect can be achieved; when the light passes through the atomized light-concentrating layer 12, it is refracted and diffused by the convex hemispherical particle size structure, and the atomization and brightening effect can be produced. This makes the composite reverse prism diffusion film 1 of the present application have the effects of light-concentrating and brightening and atomization.

[0027] Specifically, the convex hemispherical particle size structure includes a base 121 disposed on the light-emitting surface of the transparent film substrate layer 11 , and a hemispherical first refractive surface 122 is convexly disposed on the base 121 .

[0028] In the embodiment of the present application, the shape of the base 121 includes but is not limited to a hexagon, and may also be a quadrilateral, pentagon or other shape base 121, or there is no base 121. The manufacturing method of the convex hemispherical particle size structure is as follows:

[0029] First, select an appropriate roller body and use micro-engraving cutting technology to make a micron jig of the required specifications;

[0030] Secondly, the micron jig made by micro-engraving cutting technology is used to micro-engraving the wheel surface of the roller body under CNC technology operation to obtain a wheel surface with a concave hemispherical particle size having an optical microstructure;

[0031] Next, install the roller body into the UV coating machine;

[0032] Finally, the haze light-collecting layer 12 having a convex hemispherical particle structure is formed on the surface of the transparent film base material layer 11 .

[0033] In the embodiment of the present application, the transparent film substrate layer 11 is made of polyethylene terephthalate (PET), and the thickness is preferably 25 μm to 250 μm. The convex hemispherical particle size structure is formed by combining and replicating a roller body with an optical microstructure (i.e., a concave hemispherical particle size) on a liquid optical grade acrylate with a low refractive index, and the refractive index of the optical grade acrylate is 1.46 to 1.62.

[0034] Specifically, the outer diameter of the convex hemispherical particle size structure in the cross section is 3 μm to 50 μm, and the height of the convex hemispherical particle size structure is 3 um to 25 um.

[0035] Specifically, the sawtooth tip of the V-cut prism focusing structure is located at a side away from the transparent film substrate layer 11. Preferably, the spacing between the two sawtooth V-cut prism focusing structures is 5 μm to 50 μm, that is, Figure 3 The distance L shown in FIG. The sawtooth height of the V-cut prism focusing structure is 2.5 μm to 25 μm. The V-cut prism focusing structure includes two second refractive surfaces 131, one end of the two second refractive surfaces 131 is inclined and converged in a direction away from the transparent film substrate layer 11, and the other end is located on the light incident surface of the transparent film substrate layer 11, and the angle between the two second refractive surfaces 131 is 60 to 120 degrees.

[0036] In another embodiment of the present application, the reverse focusing brightening layer 13 may be composed of a plurality of V-cut prism focusing structures of the same strip arranged in a circular pattern according to a height difference, and the height difference between the plurality of V-cut prism focusing structures ranges from 1 μm to 3 μm. The sawtooth tip of the V-cut prism focusing structure meanders along the length direction of the V-cut prism focusing structure to form a tortuous prism-like structure. In other embodiments of the present application, the reverse focusing brightening layer 13 may also be composed of different V-cut prism focusing structures arranged in a circular pattern according to a height difference.

[0037] Reference Figure 4In the composite inverse prism diffusion film 1 in the embodiment of the present application, when the light passes through the second refractive surface 131, as shown at B, the prism angle is reduced, and the light refraction surface is increased. About 60% of the incident light will be reversely refracted and focused, and effectively penetrate into the transparent film substrate layer 11 to ensure effective light utilization; the other part, as shown at A, the incident light is repeatedly reflected, and about 40% of the incident light will be reflected back for reuse. The light penetrating into the transparent film substrate layer 11 is transmitted to the atomized light-gathering layer 12 as shown at C, and then refracted and scattered on the first refractive surface 122, thereby achieving an atomization effect.

[0038] Example 2

[0039] Provide a liquid crystal display backlight module, referring to Figure 5 , comprising a backlight source 2 and a reflective film 3, a light guide plate 4, a lower composite brightness enhancement film 5, an upper composite brightness enhancement film 6, a polarized brightness enhancement film 7 and a liquid crystal panel 8 stacked in sequence from bottom to top, the backlight source 2 is arranged on one side of the light guide plate 4, and the composite inverse prism diffusion film 1 in Example 1 is arranged between the light guide plate 4 and the lower composite brightness enhancement film 5. The reverse focusing brightness enhancement layer 13 of the composite inverse prism diffusion film 1 is arranged on a side of the transparent film substrate layer 11 close to the light guide plate 4, and the atomized focusing layer 12 of the composite inverse prism diffusion film 1 is arranged on a side of the transparent film substrate layer 11 close to the lower composite brightness enhancement film 5.

[0040] In a liquid crystal display backlight module of an embodiment of the present application, the backlight source 2 emits light and is emitted from a side of the light guide plate 4 close to the composite inverse prism diffusion film 1, and then passes through the reverse focusing brightening layer 13, the transparent film substrate layer 11 and the atomized light focusing layer 12 of the composite inverse prism diffusion film 1 in sequence. When the light passes through the reverse focusing brightening layer 13, it is reversely refracted and focused by the second refractive surface 131, which can improve the light transmission effect, and part of the reflected light can also be reflected on the reflective film 3 for reuse. Subsequently, the light passes through the transparent film substrate layer 11 and is transmitted to the atomized light focusing layer 12. When the light passes through the first refractive surface 122 of the atomized light focusing layer 12, refraction and scattering will occur, achieving the effects of focusing brightening and atomization. Next, the light passing through the atomized light focusing layer 12 passes through the lower composite brightening film 5 and the upper composite brightening film 6 in sequence, which can achieve the brightening effect again. Next, the light passes through the polarized brightness enhancement film 7, which can eliminate strong reflected light and scattered light, making the light soft. Finally, the light is projected onto the liquid crystal panel 8 so that the user can clearly observe the information on the liquid crystal panel 8.

[0041] Furthermore, an anti-scratch layer 9 is provided between the composite inverse prismatic diffusion film 1 and the light guide plate 4 .

[0042] In the embodiment of the present application, the anti-scratch layer 9 is made of melamine formaldehyde resin, to which spacer particles are added, and the spacer particles are particles of polyethylene wax material modified by polytetrafluoroethylene. The anti-scratch layer 9 can effectively prevent scratches caused by friction between the composite inverse prism diffusion film 1 and the light guide plate 4.

[0043] Compared with traditional liquid crystal displays, the composite inverse prism diffusion film 1 and liquid crystal display backlight module of the utility model can increase the light output intensity of the display by relying on its own composite inverse prism diffusion film 1, and can adapt to strong light environments without excessively adjusting the output power of the display, thereby having the effect of improving the brightness and battery life of the display.

[0044] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A composite inverse prism diffusion film, characterized in that: The invention comprises a transparent film substrate layer (11), wherein the light emitting surface and the light incident surface of the transparent film substrate layer (11) are respectively provided with an atomized light-gathering layer (12) and a reverse light-gathering brightening layer (13), wherein the atomized light-gathering layer (12) comprises a plurality of convex hemispherical particle size structures arranged in an array, and the reverse light-gathering brightening layer (13) comprises a plurality of V-cut prism light-gathering structures arranged in a zigzag shape in cross section.

2. The composite inverse prismatic diffusion film according to claim 1, characterized in that: The convex hemispherical particle size structure comprises a base (121) arranged on the light-emitting surface of the transparent film substrate layer (11), and a hemispherical first refractive surface (122) is convexly arranged on the base (121).

3. The composite inverse prismatic diffusion film according to claim 2, characterized in that: The outer diameter of the convex hemispherical particle size structure in the cross section is 3 μm to 50 μm, and the height of the convex hemispherical particle size structure is 3 um to 25 um.

4. The composite inverse prismatic diffusion film according to claim 1, characterized in that: The convex hemispherical particle size structure is formed by optical grade acrylate with a low refractive index, and the refractive index of the optical grade acrylate is 1.46-1.

62.

5. The composite inverse prismatic diffusion film according to claim 1, characterized in that: The V-cut prism focusing structure comprises two second refractive surfaces (131), one end of the two second refractive surfaces (131) is fixed to the transparent film substrate layer (11), and the other ends of the two second refractive surfaces (131) are inclined in a direction away from the transparent film substrate layer (11) and converge into a sawtooth tip.

6. The composite inverse prismatic diffusion film according to claim 5, characterized in that: The distance between two adjacent V-cut prism focusing structures is 5 μm to 50 μm.

7. The composite inverse prismatic diffusion film according to claim 5, characterized in that: The sawtooth height of the V-cut prism focusing structure is 2.5 μm to 25 μm.

8. A liquid crystal display backlight module, characterized in that: The invention comprises a backlight source (2) and a reflective film (3), a light guide plate (4), a lower composite brightness enhancement film (5), an upper composite brightness enhancement film (6), a polarized brightness enhancement film (7) and a liquid crystal panel (8) stacked in sequence from bottom to top, wherein the backlight source (2) is arranged on one side of the light guide plate (4), and a composite inverse prism diffusion film (1) according to any one of claims 1 to 7 is arranged between the light guide plate (4) and the lower composite brightness enhancement film (5).

9. The liquid crystal display backlight module according to claim 8, characterized in that: An anti-scratch layer (9) is provided between the composite inverse prism diffusion film (1) and the light guide plate (4).

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