Light guide assembly, fabrication method thereof, backlight module and display device

1. A light guide assembly, comprising:

a light guide plate comprising a light exit surface, a back surface opposite to the light exit surface, and a side surface contacting the light exit surface and the back surface;

a first reflective layer on the light exit surface and comprising a plurality of light transmissive holes; and

a diffusion layer on a side of the first reflective layer facing away from the light guide plate, wherein the diffusion layer comprises a plate and a plurality of protrusions on a surface of the plate, and wherein the plurality of protrusions are in one-to-one correspondence with the plurality of the light transmissive holes such that a respective light transmissive hole of the plurality of light transmissive holes receives a corresponding protrusion of the plurality of protrusions.

2. The light guide assembly according to claim 1 , further comprising:

a second reflective layer on at least a part of the side surface and at least a part of the back surface.

3. The light guide assembly according to claim 2 , wherein the first reflective layer, the diffusion layer, and the second reflective layer are formed by a coating, printing, spraying, or plating process.

4. The light guide assembly according to claim 1 , wherein the plurality of protrusions of the diffusion layer are integral to the plate of the diffusion layer.

5. The light guide assembly according to claim 1 wherein the back surface comprises a plurality of microstructures.

6. The light guide assembly according to claim 1 , wherein:

a part of the side surface defines a light entrance surface; and

along a direction away from the light entrance surface, a sum of areas of the light transmissive holes per unit area on the first reflective layer gradually decreases.

7. The light guide assembly according to claim 1 , wherein:

respective areas of the plurality of light transmissive holes are equal;

a part of the side surface defines a light entrance surface; and

along a direction away from the light entrance surface, a distance between two adjacent light transmissive holes of the plurality of light transmissive holes gradually decreases.

8. The light guide assembly according to claim 1 , wherein:

a distance between two adjacent light transmissive holes of the plurality of light transmissive holes is constant;

a part of the side surface defines a light entrance surface; and

along a direction away from the light entrance surface, respective areas of the light transmissive holes gradually increase.

9. The light guide assembly according to claim 1 , wherein:

the light guide plate further comprises a light entrance surface; and

the light entrance surface comprises a light source receiving groove.

10. A backlight module, comprising:

a light guide assembly according to claim 1 ; and

a light source on a light entrance surface of the light guide plate.

11. The backlight module of according to claim 10 , wherein the light source is a light emitting diode (LED) light source, and the LED light source comprises:

a LED flexible circuit board; and

a LED light strip on a surface of the LED flexible circuit board,

wherein the light entrance surface comprises a light source receiving groove, and wherein the LED light strip is in the light source receiving groove.

12. The backlight module according to claim 11 , wherein a light emitting surface of the LED light strip is parallel to a surface of the LED flexible circuit board.

13. A display device comprising the backlight module according to claim 10 .

14. The display device according to claim 13 , wherein the light source is a light emitting diode (LED) light source, and the LED light source comprises:

a LED flexible circuit board; and

a LED light strip on a surface of the LED flexible circuit board;

wherein the light entrance surface comprises a light source receiving groove, and wherein the LED light strip is in the light source receiving groove.

15. A method for fabricating a light guide assembly, the method comprising:

providing a light guide plate comprising a light exit surface, a back surface opposite the light exit surface, and a side surface contacting the light exit surface and the back surface;

forming a first reflective layer on the light exit surface, the first reflective layer comprising a plurality of light transmissive holes; and

forming a diffusion layer on a side of the first reflective layer facing away from the light guide plate, the diffusion layer comprising a plate and a plurality of protrusions on a surface of the plate, the plurality of protrusions being in one-to-one correspondence with the plurality of the light transmissive holes with a respective light transmissive hole of the plurality of light transmissive holes receiving a corresponding protrusion of the plurality of protrusions.

16. The method according to claim 15 , wherein the first reflective layer and the diffusion layer are formed by a coating, printing, spraying, or plating process.

17. The method according to claim 15 , further comprising:

forming a second reflective layer on at least a part of the side surface and at least a part of the back surface, the second reflective layer being formed by a coating, printing, spraying, or plating process.

18. The method according to claim 17 , further comprising:

performing a matting treatment on at least a part of the side surface before forming the second reflective layer.

19. The method according to claim 15 , further comprising:

performing a cutting treatment or a surface grinding treatment on the light exit surface before forming the first reflective layer.

20. The method according to claim 15 , wherein forming the first reflective layer on the light exit surface comprises:

forming a mask on the light exit surface, a pattern of the mask corresponding to a pattern of the plurality of light transmissive holes;

forming the first reflective layer by a coating, printing, spraying, or plating process; and

removing the mask.