CN215181301U

CN215181301U - Gain diffusion film and backlight module

Info

Publication number: CN215181301U
Application number: CN202120431834.3U
Authority: CN
Inventors: 敖光印
Original assignee: Huizhou Longli Technology Development Co ltd
Current assignee: Huizhou Longli Technology Development Co ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-12-14
Anticipated expiration: 2031-02-26

Abstract

The utility model discloses a gain diffusion film and a backlight module, wherein the gain diffusion film comprises a substrate, a prism layer arranged on the substrate and used for refraction and light splitting, and a microstructure layer used for improving the light-emitting brightness and the light uniformity; the prism layer and the micro-structural layer are respectively arranged on two sides of the substrate. The utility model provides a gain diffusion barrier, structural design is simple, refracts and disperses light to the microstructure layer through the prism structure on prism layer, and the microstructure layer can avoid the excessive weakening of unit area's luminous intensity to improve the light-emitting brightness and evenly shoot out; the brightness gain of the backlight module applying the gain diffusion film reaches 13-14%.

Description

Gain diffusion film and backlight module

Technical Field

The utility model relates to a backlight unit field especially relates to a gain diffusion barrier and backlight unit.

Background

BackLight module (BackLight) is a device for providing light source behind a Liquid Crystal Display (LCD), and its light emitting effect directly affects the visual effect of the liquid crystal display module (LCM). The liquid crystal itself does not emit light and it displays graphics or characters as a result of its modulation of the light produced by the backlight module. As shown in fig. 1, the diffusion film 1 includes a substrate 11, a lower light diffusion layer 12, and an upper light diffusion layer 13, and modifies a point light source into a uniform surface light source through the diffusion film to achieve optical diffusion, but light is refracted, reflected, and scattered in the diffusion film for multiple times to reduce light intensity per unit area, so that conversion efficiency of converting the point light source into the surface light source is low, and luminance is insufficient, thereby affecting visual effect of a display screen of the liquid crystal display.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a gain diffusion film and backlight module.

The utility model discloses a solve the technical scheme that its problem adopted and be:

a gain diffusion film comprises a substrate, a prism layer arranged on the substrate and used for refraction and light splitting, and a microstructure layer used for improving the light-emitting brightness and light uniformity; the prism layer and the micro-structural layer are respectively arranged on two sides of the substrate.

The utility model provides a gain diffusion barrier, structural design is simple, and the prism structure through prism layer refracts light and disperses to the micro-structure layer, and the micro-structure layer can avoid unit area's luminous intensity to excessively weaken in order to improve light-emitting luminance and evenly jet out.

Further, the prism layer is a prism structure arranged in an array.

Further, the micro-structure layer is a frosted layer structure.

Further, the substrate is a transparent plate.

The utility model also provides a backlight module, include the light guide plate, establish the light source in light guide plate one side and establish the optics diaphragm in the light guide plate top, still include foretell gain diffusion barrier, the gain diffusion barrier is established between light guide plate and optics diaphragm, just the prism layer sets up towards the light guide plate, the micro-structure layer sets up towards the optics diaphragm.

The utility model provides a backlight module, through gain diffusion barrier with the light refraction and the dispersion back of light guide plate reflection, the number of times of light refraction, reflection and scattering in the diffusion barrier reduces, and the light luminance that jets out to the optics diaphragm through the micro-structure layer is high and even, and luminance gain reaches 13% ~ 14%.

Furthermore, the optical film comprises an upper intensifying film and a lower intensifying film, and the prism directions of the upper intensifying film and the lower intensifying film are orthogonal.

Furthermore, the prism direction of the upper intensifying film is consistent with the light conduction direction of the light source, and the prism direction of the gain diffusion film is consistent with the prism direction of the upper intensifying film.

Furthermore, the prism direction of the lower intensifying film is consistent with the light conduction direction of the light source, and the prism direction of the gain diffusion film is consistent with the prism direction of the lower intensifying film.

Further, the light source is a light emitting diode.

To sum up, the utility model discloses a gain diffusion barrier and backlight unit thereof has following technological effect:

Drawings

FIG. 1 is a schematic structural diagram of a conventional diffusion membrane;

FIG. 2 is a schematic structural diagram of the diffusion membrane of the present invention;

FIG. 3 is an exploded view of the backlight module according to the present invention;

fig. 4 is a schematic cross-sectional view of the backlight module of the present invention;

fig. 5 is a schematic view of the light transmission direction determination simulation analysis in the diffusion film of the present invention.

Description of reference numerals:

1. a diffusion membrane; 11. a substrate; 12. a lower light diffusion layer; 13. an upper light diffusion layer; 2. a light source; 3. a light guide plate; 4. a gain diffusion film; 41. a substrate; 42. a prism layer; 43. a microstructure layer; 5. an optical film; 51. a lower intensifying membrane; 52. an upper intensifying membrane; 6. a projection screen; 7. a laser.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 2-4, the present invention provides a gain diffusion film, which comprises a substrate 41, a prism layer 42 disposed on the substrate 41 for refraction and light splitting, and a microstructure layer 43 for improving the brightness and uniformity of the light; the prism layer 42 and the microstructure layer 43 are respectively disposed on two sides of the substrate 41.

Specifically, the prism layer 42 is a prism structure arranged in an array. The microstructure layer 43 is a frosted finish structure. The substrate 41 is a transparent plate.

In the conventional diffusion film 1, a particle of chemical particle diffuser is mainly added to the diffusion film substrate 11 as the scattering particle, and the scattering particle in the conventional diffusion film is dispersed between the resin layers of the substrate 11, so that light rays continuously pass through two media with different refractive indexes when passing through the diffusion film, and thus, the light rays are subjected to a plurality of refraction, reflection and scattering phenomena, thereby causing the optical diffusion effect. The utility model discloses in do not contain the diffusant in the base plate, nevertheless be greater than 99% through setting up its haze of micro-structure, can reach fine optics diffusion effect.

The utility model also provides a backlight module, including light guide plate 3, establish the light source 2 in 3 one sides of light guide plate and establish the optics diaphragm 5 in 3 tops of light guide plate, still include foretell gain diffusion barrier 4, gain diffusion barrier 4 is established between light guide plate 3 and optics diaphragm 5, just prism layer 42 sets up towards the light guide plate, micro-structure layer 43 sets up towards the optics diaphragm.

In the present embodiment, the optical film 5 includes an upper light-increasing film 52 and a lower light-increasing film 51, and the upper light-increasing film 52 is disposed orthogonal to the prism direction of the lower light-increasing film 51. The light source 2 is a light emitting diode.

Specifically, the prism direction of the upper intensifying film 52 coincides with the light transmission direction of the light source 2, and the prism direction of the gain diffusing film 4 coincides with the prism direction of the upper intensifying film 52.

Alternatively, the prism direction of the lower intensifying film 51 coincides with the light transmission direction of the light source 2, and the prism direction of the gain diffusing film 4 coincides with the prism direction of the lower intensifying film 51.

Whether the gain diffusion film 4 is correctly installed or not affects the light emitting effect of the backlight module, and therefore, before installing the gain diffusion film 4, the light transmission direction in the gain diffusion film 4 needs to be judged to determine the prism direction of the gain diffusion film 4. Fig. 5 is a schematic diagram of a light transmission direction determination simulation analysis in the gain diffusion film, in which the gain diffusion film 4 is disposed perpendicular to the projection screen 6, and the laser 7 is disposed on the plane of the vertical projection screen 6 and the gain diffusion film 4. The method for determining the light transmission direction of the gain diffusion film 4 is as follows: emitting light to a prism layer 42 of the gain diffusion film 4 by using a laser 7, wherein the light passes through the gain diffusion film 4, is emitted after passing through a microstructure layer 43, and is projected onto a projection screen 6 to obtain a projection point; then measuring and recording a first included angle formed by the light emitted by the laser 7 and the gain diffusion film 4 and a second included angle formed by the light emitted from the microstructure layer 43 and the gain diffusion film 4; the refractive index of the gain diffusion film 4 can be calculated according to the first included angle and the second included angle, the prism direction of the gain diffusion film 4 can be judged according to the position of the projection point on the projection screen 6, if the position of the projection point is deviated to the right side of the plane of the vertical projection screen 6 and the gain diffusion film 4, the prism direction of the current gain diffusion film 4 can be preliminarily judged to be left-inclined, and if the position of the projection point is deviated to the left side of the plane of the vertical projection screen 6 and the gain diffusion film 4, the prism direction of the current gain diffusion film 4 can be preliminarily judged to be right-inclined; the laser 7 is moved, and the prism direction of the gain diffusion film 4 is determined from the obtained plurality of test results. If no proxels are currently displayed on the screen 6, the gain diffuser film 4 may be rotated or the laser 7 may be moved until a proxel appears on the screen 6.

To sum up, the utility model discloses a gain diffusion barrier and backlight unit has following technological effect:

the utility model provides a gain diffusion barrier, structural design is simple, and prism structure through prism layer 42 refracts light and disperses to micro-structure layer 43, and micro-structure layer 43 can avoid unit area's luminous intensity to weaken excessively in order to improve light-emitting brightness and evenly jet out.

The utility model provides a backlight module, through gain diffusion barrier 4 with the light refraction and the dispersion back of light guide plate reflection, the number of times of light refraction, reflection and scattering in gain diffusion barrier 4 reduces, and the light luminance that jets out to optical film 5 through micro-structure layer 43 is high and even, and luminance gain reaches 13% ~ 14%.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims

1. The gain diffusion film is characterized by comprising a substrate (41), a prism layer (42) arranged on the substrate (41) and used for refracting and splitting light, and a microstructure layer (43) used for improving the light-emitting brightness and the light uniformity; the prism layer (42) and the microstructure layer (43) are respectively arranged on two sides of the substrate (41).

2. The gain diffuser film as set forth in claim 1, wherein the prism layer (42) is a prism structure arranged in an array.

3. The gain diffuser film as set forth in claim 1, wherein the micro-structured layer (43) is a frosted finish structure.

4. The gain diffusion membrane according to any one of claims 2 to 3, wherein the substrate (41) is a transparent plate material.

5. A backlight module comprising a light guide plate (3), a light source (2) arranged at one side of the light guide plate (3) and an optical film (5) arranged above the light guide plate (3), characterized by further comprising a gain diffusing film (4) according to any one of claims 1 to 4, wherein the gain diffusing film (4) is arranged between the light guide plate (3) and the optical film (5), and the prism layer (42) is arranged towards the light guide plate (3), and the microstructure layer (43) is arranged towards the optical film (5).

6. The backlight module according to claim 5, wherein the optical film (5) comprises an upper light-enhancing film (52) and a lower light-enhancing film (51), and the upper light-enhancing film (52) is disposed orthogonally to the prism direction of the lower light-enhancing film (51).

7. The backlight module according to claim 6, wherein the prism direction of the upper intensifying film (52) is the same as the light transmission direction of the light source (2), and the prism direction of the gain diffusing film (4) is the same as the prism direction of the upper intensifying film (52).

8. The backlight module according to claim 6, wherein the prism direction of the lower intensifying film (51) is the same as the light transmission direction of the light source (2), and the prism direction of the gain diffusing film (4) is the same as the prism direction of the lower intensifying film (51).

9. A backlight module according to claim 5, characterized in that the light sources (2) are light emitting diodes.