High-brightness optical film and backlight system

Abstract

The utility model discloses a highlight optical film and a backlight system, comprising a substrate and a plurality of continuous embossment diffraction elements, and the plurality of continuous embossment diffraction elements are arranged on the upper surface of the substrate in a matrix adjacent arrangement or matrix equidistant arrangement. The high-brightness optical film has the advantages that the continuous embossment diffraction elements are adjacently arranged on the upper surface of the substrate in a matrix manner or arranged on the upper surface of the substrate in a matrix manner at equal intervals, so that the brightness of a light source emitted from the high-brightness optical film can be improved, and the uniformity of the light source emitted from the high-brightness optical film can be ensured; in addition, the overall thickness of the backlight system can be reduced, light intensity distribution is controlled through refraction, total reflection, light accumulation and the like when light rays penetrate through fine microstructures on the surface layers of the continuous embossment diffraction elements, then light rays scattered by a light source are concentrated towards the front face, light which is not used outside a visual angle is recycled through light reflection, light loss is reduced, and the light quality is improved. And meanwhile, the overall brightness and uniformity are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical films, in particular to a high-brightness optical film and a backlight system. Background Art

[0002] Most of the LCD displays on the market are backlit displays. Since the LCD screen itself does not emit light, the backlight module on the back of the LCD screen is required to provide a light source to display the image. The brightness and brightness uniformity of the display are directly determined by the backlight module. Generally, a double-layer orthogonal prism brightness enhancement film and diffusion film are added to the backlight module to improve the brightness and uniformity of the backlight. Therefore, it is of great significance to realize a backlight system that can improve brightness and uniformity while reducing thickness.

[0003] As key technologies in the field of liquid crystal display, backlight module thinning technology and brightness enhancement technology have always attracted much attention. At present, domestic and foreign research on this aspect mainly focuses on using special structures to replace certain film structures, or directly processing microstructures on the light guide plate to achieve the purpose, which causes a lot of light loss, not only reducing the brightness of the light, but also failing to ensure the uniformity of the light. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to improve the brightness of light and ensure the uniformity of light.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A high-brightness optical film comprises a substrate and continuous relief diffraction elements, wherein a plurality of continuous relief diffraction elements are arranged adjacent to each other in a matrix or are arranged equidistantly in a matrix on the upper surface of the substrate.

[0007] By arranging multiple continuous embossed diffraction elements adjacent to each other in a matrix or equidistantly in a matrix on the upper surface of the substrate, not only the brightness of the light source emitted from the high-brightness optical film can be improved, but also the uniformity of the light source emitted from the high-brightness optical film can be ensured; in addition, the overall thickness of the backlight system can be reduced. When light passes through the fine microstructure on the surface of the continuous embossed diffraction element, it is refracted, totally reflected, and accumulated to control the light intensity distribution, thereby concentrating the scattered light from the light source toward the front, and recycling the unused light outside the viewing angle through light reflection, thereby reducing light loss and improving the overall brightness and uniformity.

[0008] Preferably, the thickness A of the substrate is 50-150 μm.

[0009] Preferably, the height H of the continuous relief diffraction element is 15-30 μm.

[0010] Preferably, the cone angle R of the continuous relief diffraction element is 15°-45°.

[0011] Preferably, the bottom surface of the continuous relief diffraction element is rectangular, and the side length B is 10-100 μm.

[0012] Preferably, a plurality of continuous relief diffraction elements are equidistantly arranged in a matrix on the upper surface of the substrate, and a spacing C between two adjacent continuous relief diffraction elements is no greater than half of the side length B.

[0013] The utility model also provides a backlight system, including a backlight source, a diffusion film and a high-brightness optical film, wherein the diffusion film is located between the backlight source and the high-brightness optical film, and a side of the high-brightness optical film having a continuous embossed diffraction element is arranged close to the diffusion film.

[0014] Preferably, the backlight source is LED, mini LED or micro LED.

[0015] Preferably, the backlight source is arranged in an edge-on or direct-down manner.

[0016] Preferably, the backlight source is arranged in an edge-entry manner, and comprises a backlight source body, a light guide plate, and a reflective film. The backlight source body is arranged at the end of the light guide plate, and the light guide plate is arranged between the reflective film and the diffusion film.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] By arranging multiple continuous embossed diffraction elements adjacent to each other in a matrix or equidistantly in a matrix on the upper surface of the substrate, not only the brightness of the light source emitted from the high-brightness optical film can be improved, but also the uniformity of the light source emitted from the high-brightness optical film can be ensured; in addition, the overall thickness of the backlight system can be reduced. When light passes through the fine microstructure on the surface of the continuous embossed diffraction element, it is refracted, totally reflected, and accumulated to control the light intensity distribution, thereby concentrating the scattered light from the light source toward the front, and recycling the unused light outside the viewing angle through light reflection, thereby reducing light loss and improving the overall brightness and uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0020] Figure 2 This is a schematic structural diagram of a high-brightness optical film according to a first embodiment of the utility model;

[0021] Figure 3 This is a cross-sectional view of a continuous relief diffraction element according to Embodiment 1 of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of a high-brightness optical film according to the second embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the third embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to facilitate those skilled in the art to understand the technical solution of the utility model, the technical solution of the utility model is further explained in conjunction with the drawings in the specification.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying opposite importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically limited.

[0027] Embodiment 1

[0028] See also Figure 1 This embodiment discloses a backlight system, including a backlight source 1, a diffusion film 2 and a highlight optical film 3, wherein the diffusion film 2 is located between the backlight source 1 and the highlight optical film 3. The light emitted by the backlight source 1 passes through the diffusion film 2 and the highlight optical film 3 in sequence. In this embodiment, the backlight source 1 is an LED or a mini LED or a microLED and is arranged in a direct-down manner. Specifically, the backlight source 1 is composed of 3×3 mini LED lamp beads.

[0029] The diffusion film 2 is a film with a light transmittance of 95%, which has an atomizing effect on light.

[0030] See also Figures 2 to 3 The high-brightness optical film 3 includes a substrate 31 and a continuous relief diffraction element 32. A plurality of continuous relief diffraction elements 32 are adjacently arranged in a matrix on the upper surface of the substrate 31. The side of the high-brightness optical film 3 where the continuous relief diffraction element is provided is arranged close to the diffusion film 2.

[0031] The thickness A of the substrate 31 is 50-150 μm, the height H of the continuous relief diffraction element 32 is 15-30 μm, the cone angle R of the continuous relief diffraction element 32 is 15°-45°, and the bottom surface of the continuous relief diffraction element 32 is rectangular with a side length B of 10-100 μm.

[0032] Specifically, in this embodiment, the thickness A of the substrate 31 is 100 μm, the height H of the continuous relief diffraction element 32 is 15 μm, the cone angle R is 45°, and the side length B is 50 μm.

[0033] In this embodiment, a plurality of continuous embossed diffraction elements 32 are arranged adjacent to each other in a matrix on the upper surface of the substrate 31, which can not only improve the brightness of the light source emitted from the high-brightness optical film 3, but also ensure the uniformity of the light source emitted from the high-brightness optical film 3; in addition, the overall thickness of the backlight system can be reduced, and when the light passes through the fine microstructure on the surface of the continuous embossed diffraction element 32, the light intensity distribution is controlled by refraction, total reflection, light accumulation, etc., so that the light scattered by the light source is concentrated to the front, and the unused light outside the viewing angle is recycled through light reflection, thereby reducing light loss and improving the overall brightness and uniformity.

[0034] Embodiment 2

[0035] See also Figure 4 The difference between this embodiment and embodiment 1 is that a plurality of continuous relief diffraction elements 32 are arranged in a matrix at equal intervals on the upper surface of the substrate 31, and the spacing C between two adjacent continuous relief diffraction elements 32 is not greater than half of the side length B of the continuous relief diffraction element 32. In this embodiment, the spacing C between two adjacent continuous relief diffraction elements 32 is 20 μm.

[0036] Similarly, in this embodiment, multiple continuous embossed diffraction elements 32 are evenly arranged in a matrix on the upper surface of the substrate 31, which can not only improve the brightness of the light source emitted from the high-brightness optical film 3, but also ensure the uniformity of the light source emitted from the high-brightness optical film 3; in addition, it can also reduce the overall thickness of the backlight system.

[0037] Embodiment 3

[0038] See also Figure 5 The difference between this embodiment and the first embodiment is that the backlight source 1 is arranged in an edge-entry type, and the backlight source 1 includes a backlight source body 11, a light guide plate 12, and a reflective film 13. The backlight source body 11 is arranged at one side end of the light guide plate 12, and the light guide plate 12 is arranged between the reflective film 13 and the diffusion film 2.

[0039] Specifically, the backlight source body 11 uses LED as a lamp bead, and the backlight source body 11 is composed of 3 LED lamp beads arranged in a row on one side. The light guide plate 12 uses a conventional rectangular light guide plate to guide the light emitted by the LED into a uniform surface light source. The reflective film 13 uses ESR (Enhanced Specular Reflector, silver reflective film) to improve the utilization rate of light.

[0040] The light emitted by the backlight source body 11 is guided by the light guide plate 12 to become a uniform surface light source, thereby increasing the brightness of the output light and making the brightness of the plate surface uniform.

[0041] The light leaking from the light guide plate 12 is reflected back to the incident surface of the diffusion film by the reflection film 13 to improve the utilization rate of light energy.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] The above-described embodiments merely represent implementation methods of the utility model, and the protection scope of the utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and all of these belong to the protection scope of the utility model.

Claims

1. A high brightness optical film, characterized in that: It comprises a substrate and continuous relief diffraction elements, wherein a plurality of continuous relief diffraction elements are arranged adjacent to each other in a matrix or are arranged equidistantly in a matrix on the upper surface of the substrate; The height H of the continuous relief diffraction element is 15-30 μm; the cone angle R of the continuous relief diffraction element is 15°-45°; the bottom surface of the continuous relief diffraction element is rectangular, and the side length B is 10-100 μm.

2. The high brightness optical film according to claim 1, characterized in that: The thickness A of the substrate is 50-150 μm.

3. The high brightness optical film according to claim 1, characterized in that: A plurality of continuous relief diffraction elements are equidistantly arranged in a matrix on the upper surface of the substrate, and a distance C between two adjacent continuous relief diffraction elements is no greater than half of the side length B.

4. A backlight system, characterized in that: It comprises a backlight source, a diffusion film and the high-brightness optical film as claimed in any one of claims 1 to 3, wherein the diffusion film is located between the backlight source and the high-brightness optical film, and a side of the high-brightness optical film having a continuous embossed diffraction element is arranged close to the diffusion film.

5. A backlight system according to claim 4, characterized in that: The backlight source is LED, miniLED or micro LED.

6. A backlight system according to claim 4, characterized in that: The backlight source is arranged in an edge-on or direct-down manner.

7. A backlight system according to claim 6, characterized in that: The backlight source is arranged in an edge-entry style and comprises a backlight source body, a light guide plate and a reflective film. The backlight source body is arranged at the end of the light guide plate, and the light guide plate is arranged between the reflective film and the diffusion film.

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