CN214540314U - Composite brightness enhancement film and Mini LED backlight module applying same - Google Patents

Abstract

The utility model provides a compound brightness enhancement film and use its Mini LED backlight unit relates to liquid crystal display technical field, including the clear film substrate, the upper surface and the lower surface of clear film substrate are provided with spotlight blast layer and atomizing spotlight layer respectively, and the atomizing spotlight layer includes a plurality of first refraction surfaces that are concave rhombus tetrahedron structure. The first refraction surface with the concave diamond tetrahedron structure can show the double effects of atomization diffusion and condensation brightening through repeated refraction and repeated reflection, so that the brightness of the Mini LED backlight module applying the composite brightening film is obviously improved.

Description

Composite brightness enhancement film and Mini LED backlight module applying same

Technical Field

The utility model relates to a liquid crystal display technology field especially relates to a compound brightness enhancement film and use its Mini LED backlight unit.

Background

An LCD is a light emitting display that requires a backlight source to provide light, and is composed of a liquid crystal panel and a backlight module. The Mini LED technology can integrate more LED lamp beads into one screen due to the fact that the size of the backlight lamp beads is smaller, not only is the characteristics of lightness and thinness, flexibility and energy conservation realized, but also the screen backlight partition which is finer than the screen backlight partition in the prior art is realized through local dimming, the dynamic backlight effect which is closer to pixelation is achieved, the characteristics of lightness and thinness, high image quality, low power consumption and the like of an LCD panel are realized, and the Mini LED is widely applied.

The conventional Mini LED backlight module is a direct type backlight module generally, and although the brightness and the display effect are superior to those of a traditional backlight source emitting light from the side, the defect that the display color gamut is not high and the color saturation display brightness effect is seriously influenced still exists.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem among the prior art, the utility model provides a compound brightness enhancement film and use its Mini LED backlight unit has solved the problem that compound brightness enhancement film blast effect has the limitation among the prior art.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows:

the composite brightness enhancement film comprises a transparent film substrate, wherein a light condensation brightness enhancement layer and an atomization light condensation layer are respectively arranged on the upper surface and the lower surface of the transparent film substrate, and the atomization light condensation layer comprises a plurality of first refraction surfaces with concave diamond tetrahedron structures.

Furthermore, the first refraction surfaces are uniformly arranged on the lower surface of the transparent film substrate and are concave towards one side of the transparent film substrate.

Further, the height of the first refraction surface is 5-30 μm.

Furthermore, the diagonal size of the rhombus in the first refraction surface of the concave rhombus tetrahedron structure is 30-120 μm.

Furthermore, the first refraction surface comprises four refraction planes, one ends of the four refraction planes surround a rhombus, and the other ends of the four refraction planes are gradually inclined and converged.

Further, the thickness of the transparent film substrate is 50 μm to 250 μm.

Furthermore, the light-condensing brightness-enhancing layer is of a V-cut light-condensing structure.

Furthermore, the light condensation brightening layer is of a V-cut light condensation structure and comprises a plurality of zigzag V-cut light condensation structures arranged in a height difference mode, the height difference arrangement can be formed by matching 1-7 low V-cut light condensation structures with one high V-cut light condensation structure, and the design is regularly and circularly designed; or the height difference arrangement can also be the same V-cut condensation structure height difference rule cyclic variation design, and the height difference variation range of the V-cut condensation structure is 1-5 mu m.

Furthermore, the light-gathering brightness-enhancing layer is of a V-cut light-gathering structure and comprises a plurality of zigzag V-cut light-gathering structures arranged in a height difference mode, the distance between every two adjacent zigzag V-cut light-gathering structures arranged in a height difference mode can be 20-100 micrometers, and the height of each zigzag refraction surface is 10-50 micrometers.

The utility model provides a Mini LED backlight unit, its is including being fixed in the Mini LED array on the base plate, and the top of Mini LED array overlaps in proper order and is provided with quantum dot diffusion barrier, the foretell compound brightness enhancement film of 1~3 layers at least, polarisation brightness enhancement film and LCD panel, and first compound brightness enhancement film and the compound brightness enhancement film of second are above-mentioned compound brightness enhancement film.

The utility model has the advantages that: this spotlight brightening layer of compound brightness enhancement film's cellophane substrate upper surface can play the effect of intensifying through the refracting surface of its cockscomb structure, the atomizing spotlight layer that the lower surface set up makes light pass through and reflect between its four refraction planes through the first refracting surface of a plurality of concave rhombus tetrahedron structures, and the repeated reflection can form diffraction, thereby make the atomizing spotlight layer of lower surface can enough reach atomizing diffusion effect, also can reach the effect of spotlight brightening, and then make the luminance of using this compound brightness enhancement film's Mini LED backlight unit have obvious promotion.

Drawings

FIG. 1 is a front view of a composite brightness enhancement film.

Fig. 2 is a projection view in the direction a in fig. 1.

Fig. 3 is a perspective view in the direction B in fig. 1.

Fig. 4 is a front view of the Mini LED backlight module.

Wherein, 1, a transparent film substrate; 2. a light-condensing brightness-enhancing layer; 21. a second refraction surface; 3. an atomized light-focusing layer; 31. a first refractive surface; 4. a substrate; 5. a Mini LED array; 6. a quantum dot diffusion film; 7. compounding a brightness enhancement film; 9. a polarized brightness enhancement film; 10. an LCD panel.

Detailed Description

The embodiment of the utility model provides a through providing a compound brightness enhancement film and use its Mini LED backlight unit, solved among the prior art compound brightness enhancement film blast effect have the problem of limitation.

For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.

As shown in fig. 1, the composite brightness enhancement film comprises a transparent film substrate 1, wherein the upper surface and the lower surface of the transparent film substrate 1 are respectively provided with a light-condensing brightness enhancement layer 2 and an atomized light-condensing layer 3. The transparent film substrate 1 is made of polyethylene terephthalate (PET) and preferably has a thickness of 50-250 μm, the light-gathering brightness enhancement layer 2 and the atomized light-gathering layer 3 are integrally formed on the upper surface and the lower surface of the transparent film substrate 1, and the vertical direction refers to the thickness direction of the transparent film substrate 1 shown in FIG. 1.

As shown in FIG. 1 and FIG. 3, the light-condensing brightness-enhancing layer 2 is a V-cut light-condensing structure, which includes a plurality of zigzag V-cut light-condensing structures arranged in a height-difference manner, and the height-difference variation range of the V-cut light-condensing structure is 1-5 μm. The height difference arrangement can be 1-7 low V-cut light condensation structures matched with a high V-cut light condensation structure, and the design is regularly and circularly designed.

The height difference arrangement may also be a height difference regular cyclic variation design of the same V-cut light-gathering structure, as shown in fig. 3, the second zigzag refraction surfaces 21 extend up and down in a wavy shape along the length direction thereof, the second refraction surfaces 21 are arranged along the same preset direction, the cross section of each second refraction surface 21 perpendicular to the length direction thereof is triangular, and the second refraction surface is in a periodic up and down state relative to the film thickness direction in the length direction thereof, thereby presenting a wavy triangular prism strip shape.

Preferably, the distance between the zigzag V-cut light-gathering structures arranged in the adjacent height difference ranges from 20 to 100 micrometers, that is, the distance between two adjacent second refraction surfaces 21 ranges from 20 to 100 micrometers, and the height of the zigzag second refraction surface 21 ranges from 10 to 50 micrometers.

The composite brightness enhancement film can generate a more uniform and bright light transmission effect by matching with the refraction and condensation of the second zigzag refraction surface 21, so that the effects of focusing light and increasing brightness are achieved; the second refraction surface 21 is waved up and down along the length direction, so that the light leakage phenomenon caused by long-distance fitting can be reduced, flaws are not easily generated in the preparation process, and static electricity and waterproof ripples can be prevented.

As shown in fig. 1 and 2, the atomizing light-concentrating layer 3 includes a plurality of first refraction surfaces 31 having a concave rhomboid tetrahedral structure, and the plurality of first refraction surfaces 31 are uniformly arranged on the lower surface of the transparent film substrate 1 and are recessed toward one side of the transparent film substrate 1.

The "concave" in the concave rhombohedral tetrahedron structure means that the first refractive surface 31 is formed so as to be concave to the side where the clear film substrate 1 is attached, and the "rhombohedral tetrahedron structure" means that the first refractive surface 31 includes four refractive planes, one end of which is surrounded in a rhombohedral shape and the other end is gradually inclined and converges, that is, the first refractive surface 31 has a rhombohedral shape in cross section perpendicular to the film thickness direction. The first refraction surface 31 is four sides of the concave rhomboid tetrahedron, which are four refraction planes. Light passes through at the reciprocal refraction between four refraction planes, can play the effect of spotlight brightening, and light also can be the reciprocal reflection between four refraction planes simultaneously, and repeated reflection can form diffraction to reach atomizing diffusion's effect. Therefore, the atomizing light-condensing layer 3 can simultaneously perform the dual functions of atomizing and brightening by virtue of the structure of the first refractive surface 31 in the concave rhombic tetrahedral structure.

The height of the first refraction surface 31 is 5-30 μm, specifically, the distance between the convergence end of the four refraction surfaces and the diamond-shaped opening end. The diagonal size of the rhombus in the concave rhombus tetrahedron structure is 30-120 μm, and specifically, the diagonal size of the rhombus section of the first refraction surface 31 in the direction perpendicular to the film thickness is 30-120 μm.

The concave rhombohedral tetrahedron structure is formed by combining and copying convex rhombohedral tetrahedron with optical microstructure and liquid high-refractive-index optical-grade acrylate.

When the composite brightness enhancement film is used, the composite brightness enhancement film only needs to be arranged on the quantum dot film of the light-emitting surface of the existing Mini LED, so that the atomized light-condensing layer and the light-emitting surface of the Mini LED are in the same direction. The composite brightness enhancement film can achieve the atomization and diffusion effect on the Mini LED point-shaped light source and can achieve the condensation and brightness enhancement effect. In this embodiment, a specific application is a Mini LED backlight module, which includes a Mini LED array 5, the composite brightness enhancement film is disposed on one side of the light emitting surface of the Mini LED array 5, and the atomizing light-gathering layer 3 is located between the Mini LED array and the light-gathering brightness enhancement layer 2, that is, the first refraction surface 31 of the atomizing light-gathering layer 3 faces the light emitting side of the Mini LED array 5.

In the Mini LED backlight module, as shown in fig. 4, preferably, the Mini LED array is disposed on the substrate, and a quantum dot diffusion film 6, at least 1 to 3 layers of composite brightness enhancement films 7, a polarization brightness enhancement film 9, and an LCD panel 10 are sequentially stacked on one side of the Mini LED array 5 away from the substrate 4.

It should be apparent to those skilled in the art that while the preferred embodiments of the present invention have been described, additional variations and modifications to these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the technical range equivalent to the machine of the claims, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The composite brightness enhancement film is characterized by comprising a transparent film substrate (1), wherein a light condensation brightness enhancement layer (2) and an atomization light condensation layer (3) are respectively arranged on the upper surface and the lower surface of the transparent film substrate (1), and the atomization light condensation layer (3) comprises a plurality of first refraction surfaces (31) with concave diamond tetrahedron structures.

2. The composite brightness enhancing film according to claim 1, wherein a plurality of the first refractive surfaces (31) are uniformly arranged on the lower surface of the transparent film substrate (1) and are recessed toward one side of the transparent film substrate (1).

3. The composite brightness enhancing film according to claim 1, wherein the first refractive surface (31) has a height of 5 μm to 30 μm.

4. The composite brightness enhancing film according to claim 1, wherein the diagonal dimension of the diamonds in the first refractive surface (31) of the concave diamond tetrahedron structure is from 30 μ ι η to 120 μ ι η.

5. The composite brightness enhancing film according to claim 1, wherein the first refractive surface (31) comprises four refractive planes, one end of which enclosing a diamond shape and the other end of which being gradually inclined and converging.

6. The composite brightness enhancing film according to claim 1, wherein the transparent film substrate (1) has a thickness of 50 μm to 250 μm.

7. The composite brightness enhancing film according to claim 1, wherein the light concentrating brightness enhancing layer (2) is a V-cut light concentrating structure.

8. The composite brightness enhancement film according to claim 7, wherein the light-condensing brightness enhancement layer (2) comprises a plurality of zigzag V-cut light-condensing structures arranged in different heights, the different heights are arranged in a way that 1 to 7 low V-cut light-condensing structures are matched with one high V-cut light-condensing structure, and the V-cut light-condensing structures are designed in a regular cycle manner, or the different heights are arranged in a way that the V-cut light-condensing structures are designed in a way that the different heights are regularly changed in a cyclic manner, and the different heights of the V-cut light-condensing structures range from 1 to 5 μm.

9. The composite brightness enhancement film according to claim 8, wherein a pitch of the zigzag V-cut light-condensing structures arranged in adjacent steps is 20 to 100 μm, and a height of the zigzag second refraction surface (21) is 10 to 50 μm.

10. A Mini LED backlight module applying a composite brightness enhancement film is characterized by comprising a Mini LED array (5) fixed on a substrate (4), wherein a quantum dot diffusion film (6), 1-3 layers of composite brightness enhancement films (7) according to any one of claims 1-9, a polarization brightness enhancement film (9) and an LCD panel (10) are sequentially overlapped above the Mini LED array (5).

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