Backlight module and display device

Patent metadata

Field	Value
Publication number	US-11960113-B2
Application number	US-202218088752-A
Country	US
Kind code	B2
Filing date	Dec 26, 2022
Priority date	Aug 2, 2022
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A backlight module and a display device are disclosed. The backlight module includes a back plate, a light plate, and a plurality of lamp beads. The light plate is arranged opposite to the back plate. The plurality of lamp beads are arranged on a side of the light plate facing away from the back plate. The back plate includes a back plate body, at least one sunken groove, and a thermally conductive adhesive.

First claim

What is claimed is:

1. A backlight module, comprising:
a back plate;
a light plate, disposed opposite to the back plate;
a plurality of lamp beads, arranged on a side of the light plate facing away from the back plate;
wherein the back plate comprises a back plate body disposed opposite to and spaced apart from the light plate, at least one sunken groove disposed in a side of the back plate body opposite to the light plate, and a thermally conductive adhesive disposed in the at least one sunken groove; wherein an air channel is formed between the thermally conductive adhesive and the light plate;
wherein the back plate further comprises at least one trough connected with the at least one sunken groove, and two ends of each of the at least one trough respectively define an air inlet and an air outlet;
wherein the at least one trough is defined in the back plate body; wherein the air inlet and the air outlet are each a hole-shaped structure running through the back plate body, and do not overlap the thermally conductive adhesive; wherein a side of the thermally conductive adhesive facing the light plate forms a sawtooth structure, the sawtooth structure comprising a plurality of teeth arranged at intervals;
wherein when the backlight module is in use, a distance from the air outlet to a ground is greater than a distance from the air inlet to the ground; and wherein at least one selected from the group consisting of the following two options are used:
the first option being one in which a width of a sunken groove comparatively nearer to the air outlet is greater than a width of another sunken groove comparatively nearer to the air inlet; and
the second option being one in which in the thermally conductive adhesive, a cross-sectional area of an air channel between two adjacent teeth comparatively nearer to the air outlet is smaller than a cross-sectional area of another air channel between two adjacent teeth comparatively nearer to the air inlet.

2. The backlight module as recited in claim 1 , wherein ends of each of the plurality of teeth of the thermally conductive adhesive are in contact with the light plate, and the air channel is formed between every two adjacent teeth and the light plate.

3. The backlight module as recited in claim 1 , wherein along a width of the at least one sunken groove, a cross section of the at least one sunken groove is a triangular structure.

4. The backlight module as recited in claim 1 , wherein the at least one sunken groove comprises a plurality of sub-sunken grooves disposed in parallel, and the at least one trough comprises a plurality of sub-troughs disposed in parallel; wherein the plurality of sub-sunken grooves are disposed perpendicular to the plurality of sub-troughs; wherein both ends of each of the plurality of sub-troughs respectively define the air inlet and the air outlet.

5. The backlight module as recited in claim 1 , further comprising a heat radiation layer disposed on a side of the light plate opposite to the back plate, and wherein the air channel is formed between the heat radiation layer and the thermally conductive adhesive.

6. The backlight module as recited in claim 5 , wherein when the backlight module is in use, a distance from the air outlet to a ground is greater than a distance from the air inlet to the ground, and wherein a thickness of a portion of the heat radiation layer comparatively nearer to the air outlet is greater than a thickness of another portion of the heat radiation layer comparatively nearer to the air inlet.

7. The backlight module as recited in claim 1 ,
wherein a plurality of vent holes running through the back plate body are defined in the trough, and do not overlap the thermally conductive adhesive.

8. The backlight module as recited in claim 1 , wherein a cross-sectional area of a portion of each of the at least one trough comparatively nearer to the air inlet is greater than a cross-sectional area of another portion of the trough comparatively nearer to the air outlet, and wherein the cross-section area of the trough decreases along an air outgoing direction.

9. The backlight module as recited in claim 1 , wherein the air inlet and the air outlet are both trumpet-shaped, and each side wall of the air inlet is inclined at 45 degrees.

10. The backlight module as recited in claim 1 , wherein the thermally conductive adhesive is further disposed in the at least one trough.

11. The backlight module as recited in claim 1 , wherein an included angle is formed by two sides of each tooth of the thermally conductive adhesive, and wherein the included angle is 45°, and an interval between top surfaces of every two teeth lies in the range of 5-10 mm.

12. A backlight module, comprising a back plate, a light plate, and a plurality of lamp beads; wherein the light plate is arranged opposite to the back plate, and the plurality of lamp beads are arranged on a side of the light plate facing away from the back plate; wherein the back plate comprises a back plate body, at least one sunken groove, and a thermally conductive adhesive; the back plate body is disposed opposite to and spaced apart from the light plate; the at least one sunken groove is disposed in a side of the back plate body opposite to the light plate; the thermally conductive adhesive is disposed in the at least one sunken groove; and an air channel is arranged between the thermally conductive adhesive and the light plate;
wherein the back plate further comprises at least one trough connected with the at least one sunken groove, and two ends of each of the at least one trough respectively define an air inlet and an air outlet;
wherein the at least one trough is defined in the back plate body; the air inlet and the air outlet are each a hole-like structure running through the back plate body, and do not overlap the thermally conductive adhesive; wherein a side of the thermally conductive adhesive facing the light plate forms a sawtooth structure, which comprises a plurality of teeth arranged at intervals; wherein ends of each of the plurality of teeth of the thermally conductive adhesive are in contact with the light plate, and the air channel is formed between every two adjacent teeth and the light plate; and
wherein a distance from the air outlet to a ground is greater than a distance from the air inlet to the ground; wherein a width of a sunken groove comparatively nearer to the air outlet is greater than a width of another sunken groove comparatively nearer to the air inlet; and in the thermally conductive adhesive, a cross-sectional area of an air channel between two adjacent teeth comparatively nearer to the air outlet is smaller than a cross-sectional area of another air channel between two adjacent teeth comparatively nearer to the air inlet.

13. A display device comprising a display panel and a backlight module, wherein the backlight module comprises a back plate, a light plate, and a plurality of lamp beads; wherein the light plate is arranged opposite to the back plate, and the plurality of the lamp beads are disposed on a side of the light plate facing away from the back plate; the back plate comprises a back plate body, at least one sunken groove, and a thermally conductive adhesive; wherein the back plate body is disposed opposite to and spaced apart from the light plate; the at least one sunken groove is defined in the side of the back plate body opposite to the light plate; the thermally conductive adhesive is disposed in the sunken groove; an air channel is formed between the thermally conductive adhesive and the light plate; wherein the back plate further defines at least one trough connected with the sunken groove,

Assignees

• Hkc Corp Ltd

Inventors

• Yang Xiaohui
• Kang Baohong

Classifications

• G02B6/0085 Primary

  Means for removing heat created by the light source from the package · CPC title

• G02B6/0088

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

• G02F1/133628 Primary

  with cooling means · CPC title

• G02B6/0053

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