Light guide plate

1. A light guide plate, comprising:

a main body, comprising:

a light-incident surface;

a first main surface; and

a second main surface opposite to the first main surface,

wherein the first main surface and the second main surface are respectively connected to the light-incident surface; and

a plurality of trapezoid-like structures disposed on at least one of the first main surface and the second main surface, wherein the trapezoid-like structures extend along a direction from one side of the main body near the light-incident surface to the other side of the main body away from the light-incident surface, wherein each of the trapezoid-like structures has a width gradually increasing from one end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface, wherein each of the trapezoid-like structures comprises a flat surface and two side surfaces, and the side surfaces are respectively connected to two sides of the flat surface.

2. The light guide plate of claim 1 , wherein the first main surface is a light-emitting surface, and the second main surface is a reflecting surface.

3. The light guide plate of claim 1 , wherein both the first main surface and the second main surface are light-emitting surfaces.

4. The light guide plate of claim 1 , wherein the trapezoid-like structures are disposed respectively on the first main surface and second main surface.

5. The light guide plate of claim 1 , wherein ends of the trapezoid-like structures near the light-incident surface are arranged discontinuously.

6. The light, guide plate of claim 1 , wherein ends of the trapezoid-like structures away from the light-incident surface are arranged continuously or discontinuously.

7. The light guide plate of claim 1 , wherein every two adjacent trapezoid-like structures are spaced at a gap, and a ratio of a distance between the sides of the flat surface to the gap is in a range from 5% to 50%.

8. The light guide plate of claim 1 wherein each of the trapezoid-like structures is a convex portion or a concave portion.

9. A light guide plate, comprising:

a main body, comprising:

a light-incident surface;

a first main surface; and

a second main surface opposite to the first main surface,

wherein the first main surface and the second main surface are respectively connected to the light-incident surface; and

a plurality of trapezoid-like structures disposed on at least one of the first main surface and the second main surface, wherein the trapezoid-like structures extend along a direction from one side of the main body near the light-incident surface to the other side of the main body away from the light-incident surface, wherein each of the trapezoid-like structures has a width gradually increasing from one end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface, wherein each of the trapezoid-like structures comprises a flat surface and two side surfaces, and the side surfaces are respectively connected to two sides of the flat surface;

wherein each of the trapezoid-like structures is a convex portion, a height of the convex portion is gradually increasing from the end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface.

10. The light guide plate of claim 9 , wherein a ratio of the height of the convex portion to a thickness of the main body is in a range from 1% to 10%.

11. A light guide plate, comprising:

a main body, comprising:

a light-incident surface;

a first main surface; and

a second main surface opposite to the first main surface,

wherein the first main surface and the second main surface are respectively connected to the light-incident surface; and

a plurality of trapezoid-like structures disposed on at least one of the first main surface and the second main surface, wherein the trapezoid-like structures extend along a direction from one side of the main body near the light-incident surface to the other side of the main body away from the light-incident surface, wherein each of the trapezoid-like structures has a width gradually increasing from one end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface, wherein each of the trapezoid-like structures comprises a flat surface and two side surfaces, and the side surfaces are respectively connected to two sides of the flat surface;

wherein each of the trapezoid-like structures is a concave portion, a depth of the concave portion is gradually increasing from the end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface.

12. The light guide plate of claim 11 , wherein a ratio of the depth of the concave portion to a thickness of the main body is in a range from 1% to 10%.

13. The light guide plate of claim 1 , wherein a distribution area the trapezoid-like structures occupies 20% to 80% of a total area of one of the first main surface the second main surface.

14. The light guide plate of claim 1 , wherein an angle is included between the side surfaces, and the angle is in a range from 10 degrees to 160 degrees.

15. The light guide plate of claim 14 , wherein the side surfaces are directly connected to the sides of the flat surface respectively, and the angle is in a range from 30 degrees to 160 degrees.

16. The light guide plate of claim 14 , wherein the side surfaces are directly connected to the sides of the flat surface respectively, and each of the side surfaces is an arc surface.

17. The light guide plate of claim 14 , wherein the side surfaces are respectively connected to the sides of the flat surface by two arc surfaces, wherein a width between the sides of the flat surface is defined by an inequality:

W

<

R

⁡

(

1

-

sin

⁢

ϕ

2

)

wherein W represents the width, R represents a curvature radius of the arc surfaces, and φ represents the angle.

18. The light guide plate of claim 17 , wherein the curvature radius is in a range from 5 μm to 200μm.

19. The light guide plate of claim 1 , wherein the plurality of trapezoid-like structures are arranged in a plurality of microstructure regions, and a plurality of non-microstructure regions are located between any two adjacent microstructure regions.

20. The light guide plate of claim 1 , wherein each of the trapezoid-like structures has a bottom portion which has the width gradually increasing from one end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface; and

wherein the flat surface of each of the trapezoid-like structures has a constant width as the distance from the light-incident surface increases from one end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface.