Backlight module and display device

Patent metadata

Field	Value
Publication number	US-12487490-B2
Application number	US-202418783567-A
Country	US
Kind code	B2
Filing date	Jul 25, 2024
Priority date	Jul 26, 2022
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

A backlight module, including a light-emitting unit, emergent light of which passes through a packaging layer and then is transmitted to a surface of a first reflective layer, then passes through the surface of the first reflective layer and passes through the packaging layer again, enters a light-transmitting substrate from the packaging layer, and is emitted from the side of the light-transmitting substrate distant from the light-emitting unit. The thicknesses of the packaging layer and the light-transmitting substrate are effectively utilized to increase an optical path, thereby reducing the thickness of the backlight module. The first reflective layer is Lambertian. The side of the first reflective layer near the light-transmitting substrate and the side distant from the light-transmitting substrate allow the emergent light transmitted to the surface thereof to be scattered and homogenized to increase the optical path again, and can also function as diffusor plates.

First claim

What is claimed is:

1 . A backlight module, comprising:
a light-emitting substrate, comprising a transparent substrate and a plurality of light-emitting units, wherein the plurality of light-emitting units are arranged in an array on a side of the transparent substrate; an encapsulation layer, disposed on a side of the plurality of light-emitting units away from the transparent substrate, wherein an orthographic projection of the encapsulation layer on the transparent substrate at least covers an orthographic projection of the plurality of light-emitting units on the transparent substrate; and a first reflective layer, disposed on a side of the encapsulation layer away from the transparent substrate, wherein an orthographic projection of the first reflective layer on the transparent substrate at least covers the orthographic projection of the plurality of light-emitting units on the transparent substrate, and wherein the first reflective layer is a Lambertian body, wherein the encapsulation layer wraps a color conversion particle of at least one color, wherein the backlight module further comprises a first driving layer group, and the first driving layer group comprises: a first conductive layer, disposed on a same side of the transparent substrate as the light-emitting units, and the first conductive layer comprises a plurality of first wirings; a first insulating layer, disposed on a side of the first conductive layer away from the transparent substrate and is located between two adjacent first wirings, and the first insulating layer is provided with a first opening for exposing the first conductive layer; a second conductive layer, disposed on a side of the first insulating layer away from the transparent substrate, the second conductive layer comprises a plurality of second wirings, the second wirings pass through the first opening and are connected to the first wirings and are connected to the light-emitting units; and a second insulating layer, disposed on a side of the second conductive layer away from the transparent substrate and is located between two adjacent second wirings, wherein a portion of the first insulating layer located between two adjacent first wirings is provided with a second opening, and/or a portion of the second insulating layer located between two adjacent second wirings is provided with a third opening.

2 . The backlight module according to claim 1 , wherein a side of the first reflective layer close to the transparent substrate is a rough surface, and a roughness of the rough surface is greater than 2 microns.

3 . The backlight module according to claim 2 , wherein the first reflective layer is a bubble reflector, wherein the first reflective layer comprises a plurality of bubbles and a protective film wrapped around the plurality of bubbles, and diameters of the bubbles are greater than 2 microns.

4 . The backlight module according to claim 1 , wherein the encapsulation layer comprises a plurality of sub-layers, the plurality of sub-layers are respectively a first barrier layer, a color conversion layer and a second barrier layer, the first barrier layer is arranged on a side of the plurality of light-emitting units away from the transparent substrate, the color conversion layer is arranged on a side of the first barrier layer away from the transparent substrate, the second barrier layer is arranged on a side of the color conversion layer away from the transparent substrate, and the color conversion layer contains a color conversion particle of at least one color.

5 . The backlight module according to claim 1 , wherein the encapsulation layer comprises a plurality of sub-parts, each of the sub-parts wraps one of the light-emitting units, and each of the sub-parts wraps a color conversion particle of at least one color.

6 . The backlight module according to claim 5 , wherein the first reflective layer comprises a plurality of first reflective parts, and each of the first reflective parts wraps one of the sub-parts.

7 . The backlight module according to claim 1 , wherein a material of the color conversion particle is nitride phosphor or fluoride phosphor.

8 . The backlight module according to claim 1 , wherein the first driving layer group further comprises a second reflective layer, the second reflective layer is arranged between the second conductive layer and the second insulating layer, an orthographic projection of the second reflective layer on the transparent substrate overlaps at least partially with an orthographic projection of the first wirings on the transparent substrate, and an orthographic projection of the second reflective layer on the transparent substrate overlaps at least partially with an orthographic projection of the second wirings on the transparent substrate.

9 . The backlight module according to claim 1 , wherein the first insulating layer and the second insulating layer are both optical adhesives, and a transmittance of the optical adhesive to an outgoing light of the light-emitting unit is greater than 95%.

10 . The backlight module according to claim 1 , wherein the first driving layer group further comprises a third reflective layer, the third reflective layer is disposed between the transparent substrate and the first conductive layer, an orthographic projection of the third reflective layer on the transparent substrate covers an orthographic projection of the first wirings on the transparent substrate, and an orthographic projection of the third reflective layer on the transparent substrate covers an orthographic projection of the second wirings on the transparent substrate.

11 . The backlight module according to claim 1 , wherein the first wirings and the second wirings are reflective parts, a portion of the first insulating layer located between the first wirings and a portion of the second insulating layer located between the second wirings are transparent parts, and an orthographic projection area of the transparent part on the transparent substrate accounts for more than 87% of an orthographic projection of the first driving layer group on the transparent substrate.

12 . The backlight module according to claim 11 , wherein the backlight module comprises a plurality of light-emitting areas, and in different light-emitting areas, a pitch differs between two adjacent first wirings, and a pitch differs between two adjacent second wirings.

13 . The backlight module according to claim 1 , wherein the plurality of light-emitting units are arranged into a plurality of mutually interlaced equilateral triangle light-emitting groups, each of the equilateral triangle light-emitting groups comprises three light-emitting units, the three light-emitting units are respectively arranged at three vertices of the equilateral triangle light-emitting group, and two adjacent equilateral triangle light-emitting groups share two light-emitting units.

14 . The backlight module according to claim 1 , wherein the backlight module further comprises:
a polarizing layer, arranged on another side of the transparent substrate away from the light-emitting unit; a diffusion layer, arranged on a side of the polarizing layer away from the transparent substrate.

15 . A display device, comprising the backlight module according to claim 1 .

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Meng Xianqin
• Qu Yan
• Peng Weiting
• He Wei
• Wang Wei
• Zhang Chunfang
• Ling Qiuyu
• Liang Pengxia
• Chen Xiaochuan
• Dong Xue

Classifications

• G02F1/133605

  including specially adapted reflectors · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02F1/133612

  Electrical details · CPC title

• G02F1/133606

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

• G02F1/1336

  Illuminating devices · CPC title