Light guide plate and backlight module

1 . A light guide plate, comprising:

a first surface, a second surface, and a third surface, the second surface and the third surface connected to two opposite sides of the first surface, and the second surface and the third surface opposite to each other, the second surface having a plurality of light-scattering microstructures, wherein each of the light-scattering microstructures has a body portion and an edge portion, the body portion is surrounded by the edge portion, the body portion protrudes from the second surface, the edge portion is recessed into the second surface, the edge portion has a bottom portion, an inner side surface, an outer side surface, and a first depth being recessed into the second surface, the inner side surface is opposite to the outer side surface, the bottom portion is located between the inner side surface and the outer side surface, the inner side surface is connected to the body portion, and the outer side surface is connected to the second surface, in a normal direction of the second surface, a distance between the bottom portion and the second surface is the first depth, and the first depth ranges from 0.2 μm to 1.4 μm.

2 . The light guide plate according to claim 1 , wherein the body portion has a top portion protruding from the second surface, the body portion further has a second height between the second surface and the top portion in the normal direction of the second surface, and the second height ranges from 3.8 μm to 24 μm.

3 . The light guide plate according to claim 1 , wherein the second surface further has an imaginary surface, the imaginary surface extends to and penetrates through the body portion, a contour the body portion forming on the imaginary surface is circular, and a diameter of the contour of the body portion ranges from 17.3 μm to 30 μm.

4 . The light guide plate according to claim 1 , wherein the outer side surface of the edge portion has a top edge, the top edge is adjoined to the second surface, a contour the top edge forming on the second surface is circular, and a diameter of the contour of the top edge ranges from 21.22 μm to 32.4 μm.

5 . The light guide plate according to claim 1 , wherein the first height and the first depth range from 0.26 μm to 1.34 μm.

6 . A light guide plate, comprising:

a first surface, a second surface, and a third surface, the second surface and the third surface connected to two opposite sides of the first surface, and the second surface and the third surface opposite to each other, the second surface having a plurality of light-scattering microstructures, wherein each of the light-scattering microstructures has a body portion and an edge portion, the body portion is surrounded by the edge portion, the body portion is recessed into the second surface, the edge portion protrudes from the second surface, the edge portion has a top portion, an inner side surface, an outer side surface, and a first height protruding from the second surface, the inner side surface is opposite to the outer side surface, the top portion is located between the inner side surface and the outer side surface, the inner side surface is connected to the body portion, and the outer side surface is connected to the second surface, in a normal direction of the second surface, a distance between the top portion and the second surface is the first height, and the first height ranges from 0.2 μm to 1.4 μm.

7 . The light guide plate according to claim 6 , wherein the outer side surface of the edge portion has a bottom edge, the bottom edge is adjoined to the second surface, the body portion has a bottom portion recessed into the second surface, the body portion further has a second depth between the bottom edge and the bottom portion in the normal direction of the second surface, and the second depth ranges from 3.8 μm to 24 μm.

8 . The light guide plate according to claim 6 , wherein the body portion has an opening, the opening is located in the second surface, the second surface further has an imaginary surface extending to the opening, a contour the opening forming on the imaginary surface is circular, and a diameter of the contour of the opening ranges from 17.3 μm to 30 μm.

9 . The light guide plate according to claim 6 , wherein the outer side surface of the edge portion has a bottom edge, the bottom edge is adjoined to the second surface, a contour the bottom edge forming on the second surface is circular, and a diameter of the contour of the bottom edge ranges from 21.22 μm to 32.4 μm.

10 . A backlight module, comprising:

a light guide plate comprising a first surface, a second surface, and a third surface, the second surface and the third surface connected to two opposite sides of the first surface, and the second surface and the third surface opposite to each other, the second surface having a plurality of light-scattering microstructures, wherein each of the light-scattering microstructures has a body portion and an edge portion, the body portion is surrounded by the edge portion, the body portion protrudes from the second surface, the edge portion is recessed into the second surface, the edge portion has a bottom portion, an inner side surface, an outer side surface, and a first depth being recessed into the second surface, the inner side surface is opposite to the outer side surface, the bottom portion is located between the inner side surface and the outer side surface, the inner side surface is connected to the body portion, and the outer side surface is connected to the second surface, in a normal direction of the second surface, a distance between the bottom portion and the second surface is the first depth, and the first depth ranges from 0.2 μm to 1.4 μm; and

a light-emitting element disposed opposite to the first surface of the light guide plate.

11 . The backlight module according to claim 10 , further comprising an inverse prism sheet, wherein the inverse prism sheet is disposed opposite to the third surface of the light guide plate.

12 . The backlight module according to claim 11 , further comprising a reflective sheet, wherein the reflective sheet is disposed opposite to the second surface of the light guide plate.

13 . The backlight module according to claim 10 , further comprising a first diffuser sheet, a second diffuser sheet, a first prism sheet and a second prism sheet, wherein the first diffuser sheet is disposed opposite to the third surface of the light guide plate, the first prism sheet is disposed on a side of the first diffuser sheet facing away from the light guide plate, the second prism sheet is disposed on a side of the first prism sheet facing away from the light guide plate, and the second diffuser sheet is disposed on a side of the second prism sheet facing away from the light guide plate.

14 . A backlight module, comprising:

a light guide plate comprising a first surface, a second surface, and a third surface, the second surface and the third surface being connected to two opposite sides of the first surface, the second surface and the third surface being opposite to each other, the second surface having a plurality of light-scattering microstructures, wherein each of the light-scattering microstructures has a body portion and an edge portion, the body portion is surrounded by the edge portion, the body portion is recessed into the second surface, the edge portion protrudes from the second surface, the edge portion has a top portion, an inner side surface, an outer side surface, and a first height protruding from the second surface, the inner side surface is opposite to the outer side surface, the top portion is located between the inner side surface and the outer side surface, the inner side surface is connected to the body portion, and the outer side surface is connected to the second surface, in a normal direction of the second surface, a distance between the top portion and the second surface is the first height, and the first height ranges from 0.2 μm to 1.4 μm; and

a light-emitting element disposed opposite to the first surface of the light guide plate.