Backlight module and display device

Patent metadata

Field	Value
Publication number	US-12541129-B2
Application number	US-202318729851-A
Country	US
Kind code	B2
Filing date	Aug 23, 2023
Priority date	Aug 23, 2023
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

A backlight module and a display device are provided. In the backlight module, the middle frame includes a connecting portion covering the side wall and located at an end of the side wall away from the bottom wall, a surface of the connecting portion facing the optical sheet is provided with a plurality of supporting portions configured to support the optical sheet, and the plurality of supporting portions are arranged at intervals, a gap is provided between the optical sheet and a surface of a part of the middle frame facing the optical sheet and located between adjacent supporting portions.

First claim

What is claimed is:

1 . A backlight module, comprising:
a backplane, comprising a bottom wall and a side wall, wherein the side wall is connected with the bottom wall and arranged at a periphery of the bottom wall, and the bottom wall and the side wall form a receiving cavity; a middle frame, arranged around a circumference of the side wall, wherein the side wall is configured to support the middle frame; and an optical sheet, located at a side of the middle frame away from the bottom wall and arranged opposite to the bottom wall, wherein the middle frame comprises a connecting portion covering the side wall and located outside the side wall, and the connecting portion is located at an end of the side wall away from the bottom wall, a surface of the connecting portion facing the optical sheet is provided with a plurality of supporting portions configured to support the optical sheet, and the plurality of supporting portions are arranged at intervals, a gap is provided between the optical sheet and a surface of a part of the middle frame facing the optical sheet and located between adjacent supporting portions of the plurality of supporting portions, wherein the plurality of supporting portions are arranged at intervals along an edge of the middle frame, a minimum distance between two adjacent supporting portions is greater than a size of each of the plurality of supporting portions in an arrangement direction of the plurality of supporting portions.

2 . The backlight module according to claim 1 , wherein in the arrangement direction of the plurality of the supporting portions, the minimum distance between the two adjacent supporting portions is 40 to 60 times the size of the supporting portion.

3 . The backlight module according to claim 1 , wherein in the arrangement direction of the plurality of the supporting portions, the minimum distance between the two adjacent supporting portions is 45 mm to 50 mm, and/or
wherein in the arrangement direction of the plurality of the supporting portions, the size of the supporting portion is 1 mm to 1.5 mm.

4 . The backlight module according to claim 1 , further comprises a light source, wherein the light source is located on the bottom wall, and the gap is configured to transmit at least part of light emitted from the light source,
a surface of the connecting portion away from the side wall comprises a first side surface, the gap is located between the first side surface and the optical sheet, an angle between the first side surface and a first plane is 20° to 29°, and the first plane is parallel to a surface of the optical sheet facing the bottom wall.

5 . The backlight module according to claim 4 , wherein a surface of the middle frame facing the optical sheet comprises a first portion and a second portion that are connected with each other, the plurality of supporting portions are arranged on the first portion, and the gap is located between the second portion and the optical sheet.

6 . The backlight module according to claim 4 , wherein a minimum distance between a surface of the connecting portion facing the side wall and the first side surface is 8 mm to 9 mm.

7 . The backlight module according to claim 6 , wherein the surface of the connecting portion away from the side wall further comprises a second side surface and a third side surface, the first side surface is connected with the second side surface, the second side surface is connected with the third side surface, the third side surface is closer to the bottom wall than the first side surface, and an angle between the second side surface and the first plane is 60° to 65°,
herein in a normal direction of the first plane, a minimum distance between the optical sheet and the bottom wall is 28 mm to 35 mm.

8 . The backlight module according to claim 6 , wherein a surface of each of the plurality of supporting portions facing the optical sheet is parallel to the first plane, and a cross section of the supporting portion taken by the second plane is triangular, and the second plane is perpendicular to the first plane and perpendicular to an arrangement direction of the plurality of the supporting portions.

9 . The backlight module according to claim 1 , wherein each of the plurality of supporting portions and the middle frame are of an integrated structure and are made of a same material,
wherein an orthographic projection of the middle frame on the first plane is in a shape of a rectangular ring.

10 . The backlight module according to claim 4 , wherein an orthographic projection of the middle frame on the first plane is in a shape of a rectangular ring,
wherein a count of supporting portions among the plurality of supporting portions in a length direction of the rectangular ring is 20 to 30; a count of supporting portions among the plurality of supporting portions in a width direction of the rectangular ring is 12 to 18.

11 . The backlight module according to claim 1 , wherein a surface of the connecting portion away from the side wall comprises a first side surface, an angle between the first side surface and a first plane is 60° to 65°, and the first plane is parallel to a surface of the optical sheet facing the bottom wall.

12 . The backlight module according to claim 11 , wherein a surface of the middle frame away from the side wall further comprises a second side surface, the first side surface is connected with the second side surface, the second side surface is closer to the bottom wall than the first side surface, an angle between the second side surface and the first plane is 85° to 90°, and/or
wherein a size of each of the plurality of supporting portions in a normal direction of the first plane is 7 mm to 7.5 mm.

13 . The backlight module according to claim 1 , wherein each of the plurality of supporting portions and the middle frame are of separate structures and are made of different materials,
wherein the supporting portion comprises a transparent material.

14 . The backlight module according to claim 1 , wherein in a normal direction of a first plane, a minimum distance between the optical sheet and the bottom wall is 38 mm to 42 mm, and the first plane is parallel to a surface of the optical sheet facing the bottom wall.

15 . The backlight module according to claim 12 , wherein a cross section of each of the plurality of supporting portions taken by a third plane is quadrilateral, and an interval is provided between the first side surface and an end surface of the supporting portion close to a center of the optical sheet, the third plane is perpendicular to the first plane, and the third plane is perpendicular to an arrangement direction of the plurality of the supporting portions.

16 . A display device, comprising:
the backlight module according to claim 1 ; and a display panel, located at a side of the backlight module away from the bottom wall, wherein the backlight module is configured to provide backlight to the display panel.

17 . A backlight module, comprising:
a backplane, comprising a bottom wall and a side wall, wherein the side wall is connected with the bottom wall and arranged at a periphery of the bottom wall, and the bottom wall and the side wall form a receiving cavity; a middle frame, arranged around a circumference of the side wall, wherein the side wall is configured to support the middle frame; and an optical sheet, located at a side of the middle frame away from the bottom wall and arranged opposite to the bottom wall, wherein the middle frame comprises a connecting portion covering the side w

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Xue Peng
• Xu Zhuang
• Wang Zhen
• Shi Haijun
• Han Tianyang
• Wang Beibei

Classifications

• G02F1/133608 Primary

  including particular frames or supporting means · CPC title

• G02F1/133317

  Intermediate frames, e.g. between backlight housing and front frame · CPC title

• G02F1/1336

  Illuminating devices · CPC title