Backlight module

Patent metadata

Field	Value
Publication number	US-12585156-B2
Application number	US-202418616226-A
Country	US
Kind code	B2
Filing date	Mar 26, 2024
Priority date	Jul 19, 2023
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A backlight module includes a reflective element, a plurality of light-emitting elements, and a light diffusion plate. The reflective element has a first surface, a second surface, and a plurality of light source grooves. The first surface is opposite to the second surface. The light source groove extends from the first surface to the second surface and has a light-emitting outlet on the first surface. The light-emitting elements are respectively disposed in the light source grooves. The light diffusion plate is disposed opposite to the first surface, where a distance between the light diffusion plate and the first surface is 0.5 mm to 4 mm.

First claim

What is claimed is:

1 . A backlight module, comprising:
a reflective element, having a first surface, a second surface, and a plurality of light source grooves, wherein the first surface is opposite to the second surface, the light source grooves extend from the first surface to the second surface, and each of the light source grooves has a light-emitting outlet on the first surface; a plurality of light-emitting elements, respectively disposed in the light source grooves; and a light diffusion plate, disposed opposite to the first surface, wherein a distance between the light diffusion plate and the first surface is 0.5 mm to 4 mm; the backlight module further comprising a support element, wherein the support element is fixed to the reflective element and abuts against the light diffusion plate so that the distance is formed between the light diffusion plate and the first surface; wherein the first surface has an outer edge, the outer edge surrounds the light-emitting outlets, and the support element is fixed to the reflective element along the outer edge; wherein the support element comprises a plurality of segments along the outer edge and separated from each other, and a gap is formed between the two segments next to each other; wherein the light diffusion plate has a light emitting surface and a light incident surface, the light emitting surface faces away from the first surface and is opposite to the light incident surface, and the light emitting surface and/or the light incident surface comprises a plurality of optical microstructures; wherein the light diffusion plate further has a plurality of diffusion areas, and each of the diffusion areas has eight of the optical microstructures surrounding and adjacent to a point of the diffusion area, a shape of each of the optical microstructures comprises a triangular pyramid, and each of the optical microstructures has an inclined surface, the inclined surface stands on the light emitting surface and/or the light incident surface and is inclined with respect to the light emitting surface and the light incident surface, wherein two inclined surfaces of each adjacent microstructure face each other and form a connection line, an included angle is formed between the two inclined surfaces and the included angle ranges from 30 degrees to 150 degrees, and the connection lines of all the optical microstructures intersect at the point.

2 . The backlight module according to claim 1 , wherein the support element and the reflective element are formed integrally or separately.

3 . The backlight module according to claim 2 , wherein a material of the support element and the reflective element comprises rubber, polycarbonate, polypropylene, polyethylene terephthalate, or polyethylene.

4 . The backlight module according to claim 1 , wherein each of the light source grooves comprises a bottom portion and a reflective portion, the bottom portions are respectively opposite to the light-emitting outlets and are suitable for arranging the light-emitting elements, the reflective portion is located between the light-emitting outlet and the bottom portion and is suitable for surrounding the light-emitting element, the reflective portion comprises a first reflective surface and a second reflective surface, the first reflective surface is located between the second reflective surface and the bottom portion, the second reflective surface is located between the first reflective surface and the light-emitting outlet, a slope of the first reflective surface with respect to the second surface is smaller than a slope of the second reflective surface with respect to the second surface, or a curvature of the first reflective surface is greater than a curvature of the second reflective surface.

5 . The backlight module according to claim 1 , wherein each of the light-emitting elements has a top surface and a bottom surface, the top surfaces are opposite to the bottom surfaces, the top surfaces respectively face the light-emitting outlets, each of the top surfaces has a normal vector, an included angle between a peak angle of luminance of each of the light-emitting elements and the normal vector is 50 degrees to 90 degrees, and a beam angle of the light-emitting elements is 140 degrees to 180 degrees.

6 . The backlight module according to claim 5 , further comprising a plurality of light-blocking elements, wherein the light-emitting element has a top surface and a bottom surface, the top surface is opposite to the bottom surface and faces the light-emitting outlet, and the light-blocking elements are disposed on the top surface.

7 . The backlight module according to claim 1 , wherein each of the light-emitting elements has a top surface and a bottom surface, the top surfaces are opposite to the bottom surfaces, respectively face the light-emitting outlets and each have a normal vector, an included angle between a peak angle of luminance of the light-emitting element and the normal vector is-5 degrees to 5 degrees, and a beam angle of the light-emitting element is 120 degrees to 140 degrees.

8 . The backlight module according to claim 1 , wherein there is a spacing between the two adjacent light-emitting outlets in the first surface, and the spacing is 0.01 mm to 2 mm.

9 . The backlight module according to claim 1 , further comprising an optical film, wherein the optical film is disposed on a side of the light diffusion plate facing away from the reflective element.

Assignees

• Darwin Precisions Corp

Inventors

• Shen wen-tai
• Xu jia wei

Classifications

• G02F1/133608

  including particular frames or supporting means · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F1/133605

  including specially adapted reflectors · CPC title

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F1/133611 Primary

  including means for improving the brightness uniformity · CPC title