Backlight module and display device

1. A backlight module, comprising:

at least two light-emitting diode (LED) lamp boards arranged in parallel, wherein a splicing seam is between two adjacent LED lamp boards; and

a light refraction structure, disposed on a light-emitting side of the LED lamp boards and covering the splicing seam, wherein side surfaces of the light refraction structure adjacent to the two adjacent LED lamp boards are a first refraction surface and a second refraction surface,

wherein at least one of the first refraction surface and the second refraction surface is provided with grooves.

2. The backlight module according to claim 1 , wherein both the first refraction surface and the second refraction surface are cambered surfaces.

3. The backlight module according to claim 2 , wherein a radius of each of the cambered surfaces gradually decreases along a light-emitting direction of the LED lamp boards.

4. The backlight module according to claim 1 , wherein a light reflection film layer is disposed on a bottom surface of the light refraction structure.

5. The backlight module according to claim 1 , wherein there are a plurality of grooves; the LED lamp boards comprise a printed circuit board and LED lamps arranged on the printed circuit board in an array, and each of the plurality of grooves corresponds to each row of the LED lamps on the LED lamp boards adjacent to the plurality of grooves.

6. The backlight module according to claim 5 , wherein an orthogonal projection of each row of the LED lamps on the light refraction structure is located in one of the plurality of grooves corresponding to the LED lamps.

7. The backlight module according to claim 6 , wherein widths of the plurality of grooves in a column direction gradually decrease along a light-emitting direction of the LED lamp boards.

8. The backlight module according to claim 6 , wherein a contour curve of a cross-sectional shape of each of the plurality of grooves parallel to a light-emitting plane of the LED lamp boards satisfies a following curve equation:

X

2

a

2

+

Y

2

b

2

=

1

,

where a is greater than 0, b is greater than 0, X is a coordinate value of a point on the contour curve on an x-axis, and Y is a coordinate value of the point on the contour curve on a y-axis.

9. The backlight module according to claim 8 , wherein the X ranges between-2.81 mm and 2.81 mm.

10. The backlight module according to claim 1 , further comprising:

a diffuser plate disposed on the light-emitting side of the LED lamp boards and located above the light refraction structure.

11. The backlight module according to claim 10 , wherein a top of the light refraction structure abuts a bottom surface of the diffuser plate.

12. A display device comprising a display panel and a backlight module, wherein the backlight module comprises:

at least two light-emitting diode (LED) lamp boards arranged in parallel, wherein a splicing seam is between two adjacent LED lamp boards; and

a light refraction structure disposed on a light-emitting side of the LED lamp boards and covering the splicing seam, wherein side surfaces of the light refraction structure adjacent to the two adjacent LED lamp boards are a first refraction surface and a second refraction surface;

wherein at least one of the first refraction surface and the second refraction surface is provided with grooves.

13. The display device according to claim 12 , wherein both the first refraction surface and the second refraction surface are cambered surfaces.

14. The display device according to claim 13 , wherein a radius of each of the cambered surfaces gradually decreases along a light-emitting direction of the LED lamp boards.

15. The display device according to claim 12 , wherein a light reflection film layer is disposed on a bottom surface of the light refraction structure.

16. The display device according to claim 12 , wherein there are a plurality of grooves; the LED lamp boards comprise a printed circuit board and LED lamps arranged on the printed circuit board in an array, and each of the plurality of grooves corresponds to each row of the LED lamps on the LED lamp boards adjacent to the plurality of grooves.

17. The display device according to claim 16 , wherein an orthogonal projection of each row of the LED lamps on the light refraction structure is located in one of the plurality of grooves corresponding to the LED lamps.

18. The display device according to claim 17 , wherein widths of the plurality of grooves in a column direction gradually decrease along a light-emitting direction of the LED lamp boards.