Backlight assembly and display device applying the same

1. A backlight assembly, comprising:

an optical plate;

a light source, provided near the optical plate; and

a brightness redistribution film, provided above the optical plate and having a light exiting surface;

wherein, when light emitted by the light source passes through the optical plate and the brightness redistribution film, a front view angle brightness measured in a normal line direction of the light exiting surface of the brightness redistribution film has a brightness ratio relative to a maximum brightness emitted from the backlight assembly, and the brightness ratio is greater than or equal to 60% and smaller than 100%.

2. The backlight assembly according to claim 1 , wherein the maximum brightness emitted from the backlight assembly appears on horizontal is view angles between 10 degrees and 60 degrees.

3. The backlight assembly according to claim 1 , wherein the brightness redistribution film comprises a structured surface provided towards the optical plate, the structured surface comprises a plurality of protrusions and a plurality of grooves, and the plurality of protrusions and the plurality of grooves are alternately configured.

4. The backlight assembly according to claim 3 , wherein a cross section shape of one of the protrusions is triangular or trapezoidal.

5. The backlight assembly according to claim 4 , wherein one of the protrusions has a maximum width and a minimum width in a first direction, a ratio of the minimum width relative to the maximum width is a first ratio, and the first ratio is greater than or equal to 0 and smaller than or equal to 0.8.

6. The backlight assembly according to claim 3 , wherein the plurality of protrusions comprise protrusions of at least two different heights.

7. The backlight assembly according to claim 3 , wherein one of the plurality of grooves has a flat region, one of the plurality of protrusions has a maximum width in a first direction, the flat region has a flat width in the first direction, a ratio of the flat width relative to the maximum width is a second ratio, and the second ratio is greater than 0 and smaller than or equal to 5.

8. The backlight assembly according to claim 3 , further comprising:

an optical adhesive layer, located between the optical plate and the brightness redistribution film;

wherein, the plurality of protrusions of the brightness redistribution film are provided towards the optical adhesive layer, and at least a part of the plurality of protrusions are embedded into the optical adhesive layer.

9. The backlight assembly according to claim 1 , further comprising an optical film located between the optical plate and the brightness redistribution film.

10. The backlight assembly according to claim 6 , wherein the plurality of protrusions comprise m first protrusions having a first height and n second protrusions having a second height that is greater than the first height, m and n are positive integers, and 0<n/m≤1/3.

11. A display device, comprising:

a display panel;

a backlight assembly, provided on one side of the display panel, comprising:

an optical plate;

a light source, provided near the optical plate; and

a brightness redistribution film provided above the optical plate and having a light exiting surface;

wherein, when light emitted by the light source passes through the optical plate and the brightness redistribution film, a front view angle brightness measured in a normal line direction of the light exiting surface of the brightness redistribution film has a brightness ratio relative to a maximum brightness emitted from the backlight assembly, and the brightness ratio is greater than or equal to 60% and smaller than 100%.

12. The display device according to claim 11 , wherein the maximum brightness emitted from the backlight assembly appears on horizontal view angles between 10 degrees and 60 degrees.

13. The display device according to claim 11 , wherein the brightness redistribution film comprises a structured surface provided towards the optical plate, the structured surface comprises a plurality of protrusions and a plurality of grooves, and the plurality of protrusions and the plurality of grooves are alternately configured.

14. The display device according to claim 13 , wherein a cross section shape of one of the protrusions is triangular or trapezoidal.

15. The display device according to claim 14 , wherein one of the protrusions has a maximum width and a minimum width in a first direction, a ratio of the minimum width relative to the maximum width is a first ratio, and the first ratio is greater than or equal to 0 and smaller than or equal to 0.8.

16. The display device according to claim 13 , wherein the plurality of protrusions comprise protrusions of at least two different heights.

17. The display device according to claim 13 , wherein one of the plurality of grooves has a flat region, one of the plurality of protrusions has a maximum width in a first direction, the flat region has a flat width in the first direction, a ratio of the flat width relative to the maximum width is a second ratio, and the second ratio is greater than 0 and smaller than or equal to 5.

18. The display device according to claim 13 , wherein the backlight assembly further comprises:

an optical adhesive layer, located between the optical plate and the brightness redistribution film;

wherein, the plurality of protrusions of the brightness redistribution film are provided towards the optical adhesive layer, and at least a part of the plurality of protrusions are embedded into the optical adhesive layer.

19. The display device according to claim 11 , wherein the backlight assembly further comprises an optical film located between the optical plate and the brightness redistribution film.

20. The display device according to claim 16 , wherein the plurality of protrusions comprise m first protrusions having a first height and n second protrusions having a second height that is greater than the first height, m and n are positive integers, and 0<n/m≤1/3.