Light-emitting device and backlight module thereof

Patent metadata

Field	Value
Publication number	US-2022137280-A1
Application number	US-202117448351-A
Country	US
Kind code	A1
Filing date	Sep 21, 2021
Priority date	Oct 30, 2020
Publication date	May 5, 2022
Grant date	—

Abstract

The present disclosure proposes a light-emitting device and a backlight module thereof. The light-emitting elements includes a substrate, a plurality of light-emitting elements, a light guide layer, a plurality of first light adjustment patterns, and a plurality of second light adjustment patterns. The light-emitting elements are disposed on the substrate. The light guide layer covers the substrate and the light-emitting elements. The first light adjustment patterns are disposed over or embedded within the light guide layer, and each of the first light adjustment patterns is located above each of the light-emitting elements, respectively. The second light adjustment patterns are disposed on or embedded in the light guide layer, and the second light adjustment patterns surround the corresponding first light adjustment patterns, respectively. The first light adjustment patterns and second light adjustment patterns have a refractive index smaller than that of the light guide layer.

First claim

What is claimed is:

1 . A light-emitting device, comprising:
a substrate; a plurality of light-emitting elements, disposed on the substrate; a light guide layer, covering the substrate and the plurality of light-emitting elements; a plurality of first light adjustment patterns, disposed on the light guide layer or embedded within the light guide layer, wherein each of the plurality of first light adjustment patterns is respectively located above each of the plurality of light-emitting elements; and a plurality of second light adjustment patterns, disposed on the light guide layer or embedded in the light guide layer, wherein the plurality of second light adjustment patterns respectively surrounds the corresponding first light adjustment patterns, wherein the plurality of first light adjustment patterns and the plurality of second light adjustment patterns have a refractive index smaller than that of the light guide layer.

2 . The light-emitting device of claim 1 , wherein the plurality of first light adjustment patterns and the plurality of second light adjustment patterns partially refract and partially reflect light beams emitted from the plurality of light-emitting elements.

3 . The light-emitting device of claim 1 , wherein each of the plurality of first light adjustment patterns comprises a first mesh dot, and each of the plurality of second light adjustment patterns comprises a plurality of second mesh dots.

4 . The light-emitting device of claim 3 , wherein an area of the first mesh dot is larger than an area of each of the plurality of light-emitting elements, and an area of the first mesh dot is larger than an area of each of the plurality of second mesh dots.

5 . The light-emitting device of claim 4 , wherein sizes of the plurality of second mesh dots are arranged from large to small along a direction away from the first mesh dot.

6 . The light-emitting device of claim 4 , wherein densities of the plurality of second mesh dots are arranged from dense to sparse or from sparse to dense along a direction away from the first mesh dot.

7 . The light-emitting device of claim 4 , wherein the plurality of second mesh dots have a center point, the plurality of second dots being disposed between each of the first mesh dots and arranged symmetrically about the center point.

8 . The light-emitting device of claim 4 , wherein the plurality of second mesh dots take a center point of the first mesh dot as a center of circle, and are arranged around the center of circle concentrically.

9 . The light-emitting device of claim 1 , wherein a total area of the plurality of first light adjustment patterns and the plurality of second light adjustment patterns is less than 50% of a total area of the substrate.

10 . The light-emitting device of claim 1 , wherein the light guide layer has a rough upper surface.

11 . The light-emitting device of claim 1 , wherein the light guide layer includes a plurality of scattering particles dispersed in the light guide layer.

12 . The light-emitting device of claim 1 , wherein the light guide layer includes a plurality of anti-precipitation particles dispersed in the light guide layer.

13 . The light-emitting device of claim 1 , wherein the substrate is a light-transmissive substrate.

14 . The light-emitting device of claim 13 , wherein the light-transmissive substrate is a glass substrate.

15 . The light-emitting device of claim 1 , further comprising a circuit layer disposed over the substrate, wherein the plurality of light-emitting elements are disposed on portions of the circuit layer.

16 . The light-emitting device of claim 15 , further comprising a reflective layer, disposed on the circuit and covered by the light guide layer.

17 . The light-emitting device of claim 16 , wherein a material of the reflective layer comprises aluminum and silicon dioxide, silver and silicon dioxide, gallium nitride, titanium dioxide, ceramic materials, Distributed Bragg Reflectors or a combination thereof.

18 . The light-emitting device of claim 1 , wherein the plurality of light-emitting elements are light-emitting diode elements.

19 . The light-emitting device of claim 1 , wherein the plurality of light-emitting elements emit blue light.

20 . A backlight module, comprising the light-emitting device of claim 1 .

Assignees

• Lextar Electronics Corp

Inventors

• Lai Lung-Kuan
• Liang Jian-Chin

Classifications

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/856

  Reflecting means · CPC title

• H10H29/142 Primary

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• G02B6/0061 Primary

  to provide homogeneous light output intensity · CPC title

• G02B6/004

  Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles · CPC title