Backlight module and display device

Patent metadata

Field	Value
Publication number	US-12204131-B2
Application number	US-202318286463-A
Country	US
Kind code	B2
Filing date	Jan 10, 2023
Priority date	Jan 24, 2022
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

Backlight module and display device are disclosed. The backlight module includes a light source structure and a light guide plate, which includes a body structure and a wedge-shaped structure disposed on the body structure and located at a side adjacent to the light source structure. The body structure includes a light incident surface of body structure. The wedge-shaped structure includes a bottom surface, a wedge surface and a light incident surface of wedge-shaped structure. The light source structure includes a light source, light emitted by which enters the light guide plate through the light incident surface of body structure and the light incident surface of wedge-shaped structure. In a direction perpendicular to the bottom surface, a ratio of thickness of the body structure to thickness of light-exiting surface of the light source is less than or equal to 88%.

First claim

What is claimed is:

1. A backlight module, comprising: a light source structure and a light guide plate;
wherein the light guide plate comprises a body structure and a wedge-shaped structure, the wedge-shaped structure is disposed on the body structure and located at a side adjacent to the light source structure;
the body structure comprises a light incident surface of the body structure; the wedge-shaped structure comprises a bottom surface, a wedge surface and a light incident surface of the wedge-shaped structure, the bottom surface is disposed in surface contact with the body structure; the light incident surface of the wedge-shaped structure, the wedge surface and the bottom surface form a protrusion on the body structure, and a thickness of the wedge-shaped structure gradually decreases in a direction from the light incident surface of the body structure, extending along the body structure and away from the light source structure; and
the light source structure comprises a light source and a carrier carrying the light source; the light incident surface of the body structure is located at a side of the body structure facing the light source, and the light incident surface of the wedge-shaped structure is located at a side of the wedge-shaped structure facing the light source; a light emitted by the light source enter the light guide plate through the light incident surface of the body structure and the light incident surface of the wedge-shaped structure; in a direction perpendicular to the bottom surface, a ratio of a thickness of the body structure to a thickness of a light-exiting surface of the light source is less than or equal to 88%.

2. The backlight module according to claim 1 , wherein in a direction perpendicular to a light-exiting surface of the body structure, a maximum thickness d 1 of the body structure satisfies: 0.24 mm≤ d1≤0.32 mm; and
a distance d 4 between the light incident surface of the body structure and a boundary of a light-exiting area of the backlight module satisfies: d4≤1.65 mm.

3. The backlight module according to claim 2 , wherein in the direction perpendicular to the bottom surface, a maximum thickness F of the wedge-shaped structure satisfies: F≤0.04 mm;
in the direction perpendicular to the light-exiting surface of the body structure, a maximum thickness d 2 of the light guide plate satisfies: 0.27 mm≤ d2≤0.33 mm;
a length d 3 of an orthographic projection of a first edge of the wedge surface onto the bottom surface satisfies: 0.3 mm≤ d3≤0.55 mm, and an included angle between the first edge and the light incident surface of the wedge-shaped structure is greater than 0 degrees; and
an included angle Z between the wedge surface and the bottom surface satisfies: Z≤4.5 degrees.

4. The backlight module according to claim 1 , wherein a plurality of first microstructures is disposed on the light-exiting surface of the body structure, the plurality of first microstructures is arranged along a direction parallel to the light incident surface of the body structure, and each of the plurality of first microstructures on the light-exiting surface of the body structure extends in a direction that is perpendicular to a direction for arranging the plurality of the first microstructures;
a cross section of the first microstructure, along the direction for arranging the plurality of the first microstructures and in the direction perpendicular to the light-exiting surface, has a first arc shape, and a radius R 1 of the first arc shape satisfies: 80 μm≤R1≤100 μm;
a distance P 1 between centers of two adjacent first microstructures satisfies: 140 μm≤P1≤ 160 μm; and
in the direction perpendicular to the light-exiting surface, a maximum height H 1 of the first microstructure satisfies: 2.2 μm≤H1≤2.6 μm.

5. The backlight module according to claim 4 , wherein a plurality of second microstructures is disposed on the wedge surface, the plurality of second microstructures is arranged in a direction parallel to the light incident surface of the wedge-shaped structure, and the second microstructure on the wedge surface extends in a direction that is perpendicular to a direction for arranging the plurality of second microstructures;
a cross section of the second microstructure, along the direction for arranging the plurality of second microstructures and in a direction perpendicular to the wedge surface, has a second arc shape, a radius R 2 of the second arc shape satisfies: 80 μm≤R2≤100 μm;
a distance P 2 between centers of two adjacent second microstructures satisfies: 34 μm≤P2≤ 44 μm; and
in the direction perpendicular to the wedge surface, a maximum height H 2 of the second microstructure satisfies: 1.8 μm≤H2≤2.2 μm.

6. The backlight module according to claim 5 , wherein the light incident surface of the wedge-shaped structure and the light incident surface of the body structure are coplanar to be a light incident surface of the light guide plate; a plurality of third microstructures is disposed on the light incident surface of the light guide plate, the plurality of third microstructures is arranged in a direction parallel to the light-exiting surface of the body structure, and the third microstructure extend in a direction that is perpendicular to a direction for arranging the plurality of third microstructures;
a cross section of the third microstructure, along the direction for arranging the plurality of third microstructures and in a direction perpendicular to the light incident surface has a third arc shape, a radius R 3 of the third arc shape satisfies: 90 μm≤R3≤110 μm;
a distance P 3 between centers of two adjacent third microstructures satisfies: 340 μm≤P3≤ 360 μm; and
in the direction perpendicular to the light incident surface, a maximum height H 3 of the third microstructure satisfies: 29.5 μm≤H3≤30.5 μm.

7. The backlight module according to claim 6 , wherein P3>P2>P1.

8. The backlight module according to claim 1 , wherein the backlight module further comprises: an optical film, a support black bar and a light-shielding film; the optical film and the support black bar are located on a light-exiting surface of the body structure, and at least a portion of the support black bar is located between the wedge surface and the optical film; a first portion of the light-shielding film is located between the support black bar and the light-exiting surface, and a second portion of the light-shielding film is located between the optical film and the light-exiting surface;
a distance d 5 between the optical film and the support black bar satisfies: 0≤ d5≤0.1 mm;
a thickness d 6 of the support black bar satisfies: 0.12 mm≤ d6≤0.15 mm; and
a thickness d 7 of the light-shielding film satisfies: 0.013 mm≤ d7≤0.017 mm.

9. The backlight module according to claim 1 , wherein the backlight module further comprises:
a reflective sheet, located at a side of the body structure facing away from the light-exiting surface; and
wherein a first portion of the carrier is located at the side of the body structure facing away from the light-exiting surface, and a distance d 8 between an orthographic projection of the first portion of the carrier onto the body structure and an orthographic projection of the reflective sheet onto the body structure satisfies: 0.1 mm≤ d8≤0.3 mm.

10. The backlight module according to claim 9 , wherein the backlight module further comprises:
a housing, wherein the light source structure, the light guide plate and the reflective sheet are located inside the housing, and an opening of the housing faces to a light-exiting side of the backlight module; a thickness d 9 of a bottom of the housing satisfies: 0.065 mm≤ d9≤0.075 mm; and
a mold frame, wherein at least

Assignees

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

Inventors

• Wang Yaodong
• Zhang Luo
• Zheng Yangli
• Zhang Xiaoping
• Ren Jian
• Liu Fangyi
• Gao Xiaojuan
• Zhou Zhenguo
• Yin Siqi

Classifications

• G02F1/1339

  Gaskets; Spacers; Sealing of cells · CPC title

• G02F1/133615 Primary

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02B6/0043

  provided on the surface of the light guide · CPC title