Backlight module, display module and display device

Patent metadata

Field	Value
Publication number	US-11366264-B2
Application number	US-201916961810-A
Country	US
Kind code	B2
Filing date	Sep 18, 2019
Priority date	Sep 18, 2019
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A backlight module, a display module, and a display device are provided in the present disclosure, which belong to the technical filed field of display devices. A display device includes a light guide plate and a light-shielding member. The light guide plate includes a light exiting surface and a bottom surface that are oppositely arranged, and a light incident surface and a light shielding surface both connected with the light exiting surface and the bottom surface. The light shielding member is disposed on the light shielding surface, where the light-shielding member includes a light reflecting layer and a light absorbing layer, and the light-absorbing layer is located on a side of the light reflecting layer away from the light shielding surface.

First claim

What is claimed is:

1. A backlight module, comprising:
a light guide plate having a light exiting surface and a bottom surface that are oppositely arranged, and a light incident surface and a light shielding surface both connected with the light exiting surface and the bottom surface; and
a light shielding member disposed on the light shielding surface, the light-shielding member having a light reflecting layer and a light absorbing layer,
wherein the light-absorbing layer is located on a side of the light reflecting layer away from the light shielding surface, the light shielding member further comprises a substrate, and the light reflecting layer and the light absorbing layer are disposed on opposite sides of the substrate.

2. The backlight module according to claim 1 , further comprising:
a light source disposed on the light incident surface of the light guide plate;
wherein a color of the light reflecting layer is the same as a color of light rays emitted by the light source, and a color of the light absorbing layer is different from the color of light rays emitted by the light source.

3. The backlight module according to claim 2 , wherein the color of the light absorbing layer and the color of light rays emitted by the light source are complementary colors.

4. The backlight module according to claim 1 , wherein the light reflecting layer is formed of a white, light reflecting material, and the light absorbing layer is formed of a black, light absorbing material.

5. The backlight module according to claim 4 , wherein a material of the light reflecting layer comprises white glue or white optical ink, and a material of the light absorbing layer comprises black glue or black optical ink.

6. The backlight module according to claim 1 , wherein:
the light guide plate appears as a rectangular shape, the light guide plate having the light exiting surface and the bottom surface disposed opposite to each other, and four side surfaces being connected to the light exiting surface and the bottom surface; and
at least one of the side surfaces is the light incident surface, and remaining side surfaces are the light shielding surfaces, and the light shielding member is located on at least one of the side surfaces.

7. The backlight module according to claim 1 , further comprising:
a back plate having a bottom plate and a border provided on the bottom plate, wherein the light guide plate is disposed on the bottom plate, the border surrounds the light guide plate, and a notch is disposed on a side of the border away from the bottom plate;
an optical functional layer disposed on a side of the light guide plate away from the bottom plate, the optical functional layer having an optical functional layer body and a protrusion portion, wherein one end of the protrusion portion is connected with edge of the optical functional layer body, and the other end of the protrusion portion extends toward a position of the border and is located in the notch; and
a middle frame disposed on the side of the border away from the bottom plate to fix the optical functional layer.

8. The backlight module according to claim 7 , wherein an orthographic projection of the optical functional layer body on the bottom plate and an orthographic projection of the middle frame on the bottom plate have an overlapping region, and an orthographic projection of the protrusion portion on the bottom plate and the orthographic projection of the middle frame on the bottom plate have an overlapping region.

9. The backlight module according to claim 8 , wherein the orthographic projection of the middle frame on the bottom plate completely covers the orthographic projection of the protrusion portion on the bottom plate.

10. The backlight module according to claim 7 , wherein a length of the protrusion portion in an extending direction thereof is greater than 0.5 mm.

11. The backlight module according to claim 7 , wherein a plurality of the protrusion portions and a plurality of the notches are provided, and each of the notches corresponds to a protrusion portion respectively.

12. The backlight module according to claim 11 , wherein the plurality of protrusion portions are distributed in the circumferential direction of the optical functional layer body.

13. A display module, comprising:
a backlight module; and
a display panel disposed at a light exiting side of the backlight module, wherein the backlight module comprises:
a light guide plate having a light exiting surface and a bottom surface that are oppositely arranged, and a light incident surface and a light shielding surface both connected with the light exiting surface and the bottom surface; and
a light shielding member disposed on the light shielding surface, the light-shielding member having a light reflecting layer and a light absorbing layer, the light-absorbing layer being located on a side of the light reflecting layer away from the light shielding surface;
wherein the light shielding member further comprises a substrate, and the light reflecting layer and the light absorbing layer are disposed on opposite sides of the substrate.

14. The display module according to claim 13 , wherein the backlight module further comprises a light source disposed on the light incident surface of the light guide plate, wherein a color of the light reflecting layer is the same as a color of light rays emitted by the light source and a color of the light absorbing layer is different from the color of light rays emitted by the light source.

15. The display module according to claim 13 , wherein the light reflecting layer is formed of a white, light reflecting material, and the light absorbing layer is formed of a black, light absorbing material.

16. The display module according to claim 13 , wherein:
the light guide plate appears as a rectangular shape;
the light guide plate has the light exiting surface and the bottom surface disposed opposite to each other, and four side surfaces connected to the light exiting surface and the bottom surface;
at least one of the side surfaces is the light incident surface;
remaining side surfaces are the light shielding surfaces; and
the light shielding member is located on at least one of the side surfaces.

17. The display module according to claim 13 , wherein the backlight module further comprises:
a back plate having a bottom plate and a border provided on the bottom plate, the light guide plate is disposed on the bottom plate, the border surrounds the light guide plate, and a notch is disposed on a side of the border away from the bottom plate;
an optical functional layer disposed on a side of the light guide plate away from the bottom plate, the optical functional layer having an optical functional layer body and a protrusion portion, one end of the protrusion portion is connected with edge of the optical functional layer body, the other end of the protrusion portion extends toward a position of the border and is located in the notch; and
a middle frame disposed on the side of the border away from the bottom plate to fix the optical functional layer.

18. A display device, comprising:
a display module comprising a backlight module and a display panel disposed at a light exiting side of the backlight module, wherein the backlight module comprises:
a light guide plate having a light exiting surface and a bottom surface that are oppositely arranged, and a light incident surface and a light shielding surface both connected with the light exiting surface and the bottom surface; and
a light shielding member dispos

Assignees

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

Inventors

• Wang Fengping
• Han Rui
• Cui Dong
• Tong Zeyuan
• Zhang Zhipeng
• Li Wenyang
• Zhai Yue
• Zhang Zan
• Leng Shouyang
• Chi Weining
• Tan Rui
• Dong Chang

Classifications

• G02B6/0055 Primary

  Reflecting element, sheet or layer · CPC title

• G02B5/003

  Light absorbing elements · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02B6/0088

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

• G02B6/0053

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