Backlight module including annular light-shielding structure and display device including the same

Patent metadata

Field	Value
Publication number	US-11536890-B2
Application number	US-202117478031-A
Country	US
Kind code	B2
Filing date	Sep 17, 2021
Priority date	Sep 17, 2020
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A backlight module and a display device are provided. The backlight module includes: a light source unit; a light guide plate, for guiding light to a display panel; an optical component for uniformly irradiating the display panel; and a back plate, at least including a bottom plate, for accommodating the light guide plate, the light source unit, and the optical component. The light guide plate and the optical component are provided with a hole penetrating through the two, a part of the back plate at the hole is bent and inserted into the hole to form a side wall, a side end surface of the optical component close to the hole is inclined regarding an axis of the hole, and an annular light-shielding structure is around a top surface of the hole.

First claim

What is claimed is:

1. A backlight module, comprising:
a light source unit, configured to emit light;
a light guide plate, wherein at least one side surface of the light guide plate is a light incident surface, the light incident surface is close to the light source unit, and the light guide plate is configured to guide the light to a display panel;
an optical component, attached to a light-exiting surface of the light guide plate and configured to uniformly irradiate the display panel with the light; and
a back plate, at least comprising a bottom plate, for accommodating the light guide plate, the light source unit, and the optical component;
wherein the light guide plate and the optical component are provided with a hole penetrating through the light guide plate and the optical component, a part of the back plate at the hole is bent and inserted into the hole to form a side wall, a side end surface of the optical component that is close to the hole is inclined with respect to an axis of the hole, and an annular light-shielding structure is provided around a top surface of the hole,
wherein a top surface of the side wall is flush with a top surface of the optical component,
wherein the light-shielding structure is on the top surface of the side wall, the top surface of the optical component, and the inclined side end surface of the optical component.

2. A backlight module, comprising:
a light source unit, configured to emit light;
a light guide plate, wherein at least one side surface of the light guide plate is a light incident surface, the light incident surface is close to the light source unit, and the light guide plate is configured to guide the light to a display panel;
an optical component, attached to a light-exiting surface of the light guide plate and configured to uniformly irradiate the display panel with the light; and
a back plate, at least comprising a bottom plate, for accommodating the light guide plate, the light source unit, and the optical component;
wherein the light guide plate and the optical component are provided with a hole penetrating through the light guide plate and the optical component, a part of the back plate at the hole is bent and inserted into the hole to form a side wall, a side end surface of the optical component that is close to the hole is inclined with respect to an axis of the hole, and an annular light-shielding structure is provided around a top surface of the hole,
wherein the optical component comprises a diffusion sheet and a composite prism sheet arranged in a stack, the diffusion sheet is attached to the light-exiting surface of the light guide plate, and a side end surface of the composite prism sheet that is close to the hole is inclined with respect to the axis of the hole.

3. The backlight module according to claim 1 , wherein the composite prism sheet comprises two prism sheets arranged in a stack, and extension directions of prism structures of the two prism sheets are perpendicular to each other.

4. The backlight module according to claim 1 , wherein an inclination angle between the side end surface of the optical component and the axis of the hole ranges from 20 degrees to 70 degrees, inclusively.

5. The backlight module according to claim 1 , wherein a top surface of the side wall is flush with a top surface of the optical component.

6. The backlight module according to claim 5 , wherein the light-shielding structure is on the top surface of the side wall and the top surface of the optical component.

7. The backlight module according to claim 5 , wherein the light-shielding structure is on the top surface of the side wall, the top surface of the optical component, and the inclined side end surface of the optical component.

8. The backlight module according to claim 1 , wherein a side surface of the side wall that is close to the light guide plate is coated with a light absorbing material.

9. The backlight module according to claim 1 , wherein a surface of the light guide plate that is away from the light-exiting surface is provided with a reflective sheet.

10. The backlight module according to claim 1 , wherein the annular light-shielding structure is an annular light-shielding tape, and the annular light-shielding tape is adhered around the top surface of the hole.

11. A display device, comprising a backlight module, wherein the backlight module comprises:
a light source unit, configured to emit light;
a light guide plate, wherein at least one side surface of the light guide plate is a light incident surface, the light incident surface is close to the light source unit, and the light guide plate is configured to guide the light to a display panel;
an optical component, attached to a light-exiting surface of the light guide plate and configured to uniformly irradiate the display panel with the light; and
a back plate, at least comprising a bottom plate, for accommodating the light guide plate, the light source unit, and the optical component;
wherein the light guide plate and the optical component are provided with a hole penetrating through the light guide plate and the optical component, a part of the back plate at the hole is bent and inserted into the hole to form a side wall, a side end surface of the optical component that is close to the hole is inclined with respect to an axis of the hole, and an annular light-shielding structure is provided around a top surface of the hole,
wherein the optical component comprises a diffusion sheet and a composite prism sheet arranged in a stack, the diffusion sheet is attached to the light-exiting surface of the light guide plate, and a side end surface of the composite prism sheet that is close to the hole is inclined with respect to the axis of the hole.

12. The display device according to claim 11 , wherein the composite prism sheet comprises two prism sheets arranged in a stack, and extension directions of prism structures of the two prism sheets are perpendicular to each other.

13. The display device according to claim 11 , wherein an inclination angle between the side end surface of the optical component and the axis of the hole ranges from 20 degrees to 70 degrees, inclusively.

14. The display device according to claim 11 , wherein a top surface of the side wall is flush with a top surface of the optical component.

15. The display device according to claim 14 , wherein the light-shielding structure is on the top surface of the side wall and the top surface of the optical component.

16. The display device according to claim 14 , wherein the light-shielding structure is on the top surface of the side wall, the top surface of the optical component, and the inclined side end surface of the optical component.

17. The display device according to claim 11 , wherein a side surface of the side wall that is close to the light guide plate is coated with a light absorbing material.

18. The display device according to claim 11 , wherein a surface of the light guide plate that is away from the light-exiting surface is provided with a reflective sheet.

19. The display device according to claim 11 , wherein the annular light-shielding structure is an annular light-shielding tape, and the annular light-shielding tape is adhered around the top surface of the hole.

Assignees

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

Inventors

• Ma Xiao
• Wu Hao
• Cui Libao
• An Na
• Ci Gang
• Zhang Zheng
• Yang Dang
• Meng Jia
• Luo Zhenhua
• Yu Zuoxin
• Zong Zheng
• Cao Xuewen

Classifications

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title

• G02F1/133524

  Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides · CPC title

• G02F1/133314

  Back frames · CPC title

• G02B6/0051 Primary

  Diffusing sheet or layer · CPC title

• G02B6/0088

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