BACKLIGHT MODULE AND PREPARING METHOD THEREOF, DISPLAY DEVICE

• US 20200133065A1
• Filed: 06/17/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Beijing Boe Chatani Electronics Co., Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing Boe Chatani Electronics Co., Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: LOU, Tengfei
• Granted Patent: US 10,921,640 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02B 6/0095 Light guides as housings, housing portions, shelves, doors, tiles, windows, or the like
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133314 Back frames
• CPC Class Codes: G02F 1/133322 Mechanical guidance or alignment of LCD panel support components
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side

Abstract

A backlight module and a preparing method thereof, and a display device are provided. The backlight module includes a back plate, a light guide plate, and an optical film sheet. The back plate includes a bottom plate, the light guide plate is located inside the back plate, the optical film sheet is disposed on a side of the light guide plate away from the back plate and fixedly connected to the light guide plate, and an orthographic projection of the optical film sheet on a plane where the bottom plate is located is located in the bottom plate.

Claims

1. A backlight module, comprising:

a back plate, comprising a bottom plate;

a light guide plate, located inside the back plate; and

an optical film sheet, disposed on a side of the light guide plate away from the back plate and fixedly connected to the light guide plate;

wherein an orthographic projection of the optical film sheet on a plane where the bottom plate is located is located within the bottom plate.

2. The backlight module according to claim 1, wherein the back plate further comprises a baffle plate, the baffle plate is disposed around the bottom plate to surround the light guide plate.

3. The backlight module according to claim 2, wherein a distance from an end of the baffle plate away from the bottom plate to the plane where the bottom plate is located is larger than or equal to a distance from a surface of the optical film sheet away from the bottom plate to the plane where the bottom plate is located.

4. The backlight module according to claim 2, wherein the baffle plate is located at an edge of the bottom plate, and the baffle plate and the bottom plate are configured to be an integral structure.

5. The backlight module according to claim 2, further comprising:

a frame, coupled to the back plate and comprising an extended portion from an outer side to an inner side of the light guide plate;

wherein the optical film sheet and the light guide plate are located between the extended portion and the bottom plate.

6. The backlight module according to claim 5, wherein an end of the baffle plate away from the bottom plate is seamlessly coupled to the extended portion.

7. The backlight module according to claim 5, wherein the light guide plate comprises a light guide plate main body, the backlight module further comprises:

a light source, disposed on a side surface of the light guide plate main body, the side surface being configured to be perpendicular to a light exiting surface of the light guide plate main body;

wherein on a side of the light guide plate main body facing the light source, an edge of the light guide plate main body is located between an edge of the optical film sheet and the baffle plate.

8. The backlight module according to claim 5, wherein on a side of the light guide plate main body which is opposite to a side of the light guide plate main body facing the light source, an edge of the optical film sheet is coincident with an edge of the light guide plate main body or located between an edge of the light guide plate main body and the baffle plate.

9. The backlight module according to claim 1, wherein the light guide plate comprises a light guide plate main body and a protrusion disposed at an edge of a side of the light guide plate main body away from the back plate, and

the light guide plate is in snap-fit connection with the optical film sheet by the protrusion.

10. The backlight module according to claim 9, wherein the optical film sheet comprises a snap-fit structure, the snap-fit structure having a shape matching the protrusion to engage with the protrusion.

11. The backlight module according to claim 10, wherein the snap-fit structure is a through hole, and the protrusion is in snap-fit connection with the through hole.

12. The backlight module according to claim 10, wherein the snap-fit structure is a groove, and the protrusion is in snap-fit connection with the groove.

13. The backlight module according to claim 10, wherein the light guide plate main body is a rectangular parallelepiped structure, and

the protrusion is located at a corner of the light guide plate main body.

14. The backlight module according to claim 13, further comprising:

a light source, disposed on a side surface of the light guide plate main body, the side surface being configured to be perpendicular to a light exiting surface of the light guide plate main body;

wherein the light guide plate comprises three protrusions, the three protrusions are respectively located at three corners of the light guide plate main body, and

three snap-fit structures in a one-to-one correspondence relationship with the three protrusions are at edges of the optical film sheet, each of the three protrusions is in snap-fit connection with a corresponding one of the three snap-fit structures.

15. The backlight module according to claim 14, wherein the three protrusions are respectively a first protrusion, a second protrusion and a third protrusion, the first protrusion and the second protrusion are respectively located at two corners of the light guide plate main body away from the light source, and the third protrusion is located at a corner of the light guide plate main body close to the light source.

16. The backlight module according to claim 15, wherein an orthographic projection of the first protrusion on the plane where the bottom plate is located and an orthographic projection of the second protrusion on the plane where the bottom plate is located are in a L-shape, and an opening of the L-shape faces a centroid of the light guide plate main body;

and/or

the third protrusion is a columnar structure.

17. The backlight module according to claim 10, wherein an orthographic projection of the protrusion on the plane where the bottom plate is located coincides with an orthographic projection of the snap-fit structure on the plane where the bottom plate is located or is located within the orthographic projection of the snap-fit structure on the plane where the bottom plate is located.

18. The backlight module according to claim 1, wherein the light guide plate is bonded to the optical film sheet.

19. A display device, comprising a display panel and the backlight module according to claim 1.

20. A method of preparing a backlight module, comprising:

providing a back plate comprising a bottom plate;

providing a light guide plate, installing the light guide plate into the back plate; and

providing an optical film sheet, installing the optical film sheet on the light guide plate and on a side of the light guide plate away from the back plate;

wherein an orthographic projection of the optical film sheet on a plane where the bottom plate is located is located in the bottom plate.