Backlight Module and Display Device

Patent metadata

Field	Value
Publication number	US-2025093572-A1
Application number	US-202218727584-A
Country	US
Kind code	A1
Filing date	Sep 23, 2022
Priority date	Sep 23, 2022
Publication date	Mar 20, 2025
Grant date	—

Abstract

A backlight module includes first and second light guide plates, an anti-peeping film, and first and second light sources. The anti-peeping film is located on a first light exit surface of the first light guide plates. The second light guide plate is located on a side of the anti-peeping film away from the first light guide plate. The first light source is opposite a first light incident surface of the first light guide plate. The second light source includes a first portion extending along the direction perpendicular to the reference plane and opposite a second light incident surface of the second light guide plate. A side of the first light source proximate to the fist light guide plate is staggered from a side of the second light source proximate to the second light guide plate, and closer to center of the first light guide plate than the second light source.

First claim

1 . A backlight module, comprising:
a first light guide plate having a first light exit surface and a first light incident surface intersecting the first light exit surface; an anti-peeping film located on a side of the first light exit surface of the first light guide plate; a second light guide plate located on a side of the anti-peeping film away from the first light guide plate, the second light guide plate having a second light exit surface away from the anti-peeping film and a second light incident surface intersecting the second light exit surface, wherein the second light incident surface and the first light incident surface are located at a same side of the first light guide plate; and a first light source and a second light source that are arranged along a direction perpendicular to a reference plane, the first light source being opposite the first light incident surface; wherein the second light source includes a first portion, the first portion extending along the direction perpendicular to the reference plane and being opposite the second light incident surface; a side of the first light source proximate to the first light guide plate is staggered from a side of the second light source proximate to the second light guide plate, and the side of the first light source proximate to the first light guide plate is closer to a center of the first light guide plate than the second light source; and the reference plane is a plane where the first light exit surface is located.

2 . The backlight module according to claim 1 , wherein the second light source further includes a second portion connected to the first portion, the second portion of the second light source being opposite the first light incident surface; and the first light source is located between the first light incident surface and the second portion of the second light source.

3 . The backlight module according to claim 1 , further comprising a light-shielding component, wherein
in the direction perpendicular to the reference plane, the light-shielding component is located between the first light source and the second light guide plate; and an orthographic projection of the light-shielding component on the reference plane covers an orthographic projection of at least a portion of the first light source on the reference plane.

4 . The backlight module according to claim 3 , wherein in a direction parallel to the reference plane, the light-shielding component extends to a space between the first light guide plate and the second light guide plate; and the second light incident surface extends beyond the first light incident surface;
and/or a partial boundary, away from second light source, of a boundary of the orthographic projection of the light-shielding component on the reference plane, and a partial boundary, away from the second light source, of a boundary of an orthographic projection of the first light source on the reference plane a distance therebetween, and the distance is greater than or equal to 3.5 mm.

5 . (canceled)

6 . The backlight module according to claim 3 , further comprising:
a light adjustment layer located between the anti-peeping film and the first light guide plate, the light adjustment layer including a third portion extending to a top of the first light source; and a first light-shielding layer located on a surface, facing the first light guide plate, of the third portion of the light adjustment layer, wherein the first light-shielding layer and the third portion of the light adjustment layer form the light-shielding component.

7 . The backlight module according to claim 6 , wherein the light adjustment layer includes:
a diffusion sheet located between the anti-peeping film and the first light guide plate; and a prism layer located between the anti-peeping film and the diffusion sheet; wherein a portion of the diffusion sheet extending to the top of the first light source forms the third portion, and the first light-shielding layer is located on a side of the diffusion sheet proximate to the first light guide plate; and/or the third portion of the light adjustment layer and the second portion of the second light source have a gap therebetween.

8 . (canceled)

9 . The backlight module according to claim 6 , wherein the first light source includes: a first light-emitting device and a first substrate arranged sequentially along a direction away from the first light incident surface, an extension direction of the first substrate being substantially perpendicular to the reference plane; and
the orthographic projection of the light-shielding component on the reference plane covers an orthographic projection of the first light-emitting device on the reference plane, and an orthographic projection of a portion of the first substrate on the reference plane.

10 . (canceled)

11 . The backlight module according to claim 4 , wherein the second light guide plate further has a second non-light incident surface intersecting the second light exit surface, and the second non-light incident surface and the second light incident surface surround the second light exit surface; and
the backlight module further comprises: a light adjustment layer located between the anti-peeping film and the first light guide plate; a back plate having an installation depression, wherein the first light guide plate, the anti-peeping film, the light adjustment layer, the second light guide plate, the first light source, and the second light source are located within the installation depression; and a plastic frame fastened to the back plate and including a first bending edge, wherein the first bending edge is located at a top of the back plate; wherein an orthographic projection of the first bending edge on the reference plane, covers an orthographic projection of an edge portion, corresponding to the second non-light incident surface, of the second light guide plate, an orthographic projection of an edge portion, corresponding to the second non-light incident surface, of the anti-peeping film, and an orthographic projection of an edge portion, corresponding to the second non-light incident surface, of the light adjustment layer.

12 . The backlight module according to claim 3 , further comprising a fixing component connected to the light-shielding component, wherein
the fixing component is located between the first light source and the second portion of the second light source.

13 . The backlight module according to claim 12 , wherein
the orthographic projection of the light-shielding component on the reference plane covers an orthographic projection of the first light source on the reference plane; and the fixing component is connected to a side surface of the light-shielding component proximate to the second light source to form a Structure, and along a direction perpendicular to an extension direction of the structure, a cross-section pattern of the structure of the light-shielding component and the fixing component is L-shaped.

14 . The backlight module according to claim 12 ,
wherein the second light guide plate further has a second non-light incident surface and a bottom surface, the bottom surface facing away from the second light exit surface; wherein the second non-light incident surface intersects and is perpendicular to the second light exit surface; and the backlight module further comprises: a second light-shielding layer covering the second non-light incident surface, and a third light-shielding layer covering a portion of the bottom surface proximate to the second non-light incident surface, the third light-shielding layer being

Assignees

• Fuzhou Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Guo Zhijie
• Chen Geng
• Diao Kai
• Hu Long
• Zhang Han
• Chen Ming
• Lin Yuhang
• Ren Liangliang
• Chen Zhiying

Classifications

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02B6/0068 Primary

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G02B6/0088

  of the light guide or other optical sheets in the package · CPC title

• G02B6/0076

  Stacked arrangements of multiple light guides of the same or different cross-sectional area · CPC title

• G02B6/0051 Primary

  Diffusing sheet or layer · CPC title