Reflective display device
A reflective display device includes a reflective display panel, a cover plate on the reflective display panel, and a front light module between the reflective display panel and the cover plate. The front light module includes a light source and a light guide plate. The light guide plate includes a main body, a first microstructure, a second microstructure and a third microstructure. The main body has a first surface, a second surface and a light incident surface. The light source is disposed on the light incident surface. The first surface is between the second surface and the cover plate. The second surface is between the reflective display panel and the first surface. The first microstructure is disposed on the first surface, the second microstructure is disposed on the first microstructures and covers a portion of the first microstructure, and the third microstructure is disposed on the second surface.
1 . A reflective display device, comprising:
a reflective display panel;
a cover plate, disposed on the reflective display panel; and
a front light module, disposed between the reflective display panel and the cover plate, and comprising:
a light source; and
a light guide plate, comprising:
a main body, having a first surface, a second surface and a light incident surface, wherein the light source is disposed on the light incident surface, the first surface is located between the second surface and the cover plate, and the second surface is located between the reflective display panel and the first surface;
a first microstructure, disposed on the first surface;
a second microstructure, disposed on the first microstructure, and covering a portion of the first microstructure; and
a third microstructure, disposed on the second surface.
2 . The reflective display device of claim 1 , wherein the other portion of the first microstructure is free of being covered by the second microstructure.
3 . The reflective display device of claim 1 , wherein a material of the main body comprises glass.
4 . The reflective display device of claim 1 , wherein an air gap exists between the light guide plate and the cover plate.
5 . The reflective display device of claim 4 , wherein a difference between a refractive index of the first microstructure and a refractive index of the air gap is not less than 0.35.
6 . The reflective display device of claim 4 , wherein a difference between a refractive index of the second microstructure and a refractive index of the air gap is not less than 0.35.
7 . The reflective display device of claim 4 , wherein the cover plate comprises:
a plate body, having a lower surface facing the light guide plate and an upper surface opposite to the lower surface; and
a fourth microstructure, disposed on the lower surface, wherein the air gap exists between the fourth microstructure and the light guide plate.
8 . The reflective display device of claim 4 , wherein the cover plate comprises:
a plate body, having a lower surface facing the light guide plate and an upper surface opposite to the lower surface, wherein the air gap exists between the lower surface and the light guide plate; and
a fifth microstructure, disposed on the upper surface.
9 . The reflective display device of claim 4 , wherein the cover plate comprises:
a plate body, having a lower surface facing the light guide plate and an upper surface opposite to the lower surface;
a fourth microstructure, disposed on the lower surface, wherein the air gap exists between the fourth microstructure and the light guide plate; and
a fifth microstructure, disposed on the upper surface.
10 . The reflective display device of claim 1 , wherein the first microstructure comprises a plurality of protrusions, and the protrusions are evenly distributed from the light incident surface to a direction away from the light incident surface.
11 . The reflective display device of claim 10 , wherein a refractive index of the second microstructure is not greater than a refractive index of the main body and is not greater than a refractive index of the first microstructure, wherein the second microstructure comprises a plurality of dots, and the dots are distributed from dense to sparse from the light incident surface to the direction away from the light incident surface.
12 . The reflective display device of claim 10 , wherein a refractive index of the second microstructure is greater than a refractive index of the main body and is greater than a refractive index of the first microstructure, wherein the second microstructure comprises a plurality of dots, and the dots are distributed from sparse to dense from the light incident surface to the direction away from the light incident surface.
13 . The reflective display device of claim 1 , wherein the third microstructure comprises a plurality of dots, and the dots are distributed from sparse to dense from the light incident surface to a direction away from the light incident surface.
14 . A reflective display device, comprising:
a reflective display panel;
a cover plate, disposed on the reflective display panel; and
a front light module, disposed between the reflective display panel and the cover plate, and comprising:
a light source; and
a light guide plate, comprising:
a main body, having a first surface, a second surface and a light incident surface, wherein the light source is disposed on the light incident surface, the first surface is located between the second surface and the cover plate, and the second surface is located between the reflective display panel and the first surface;
a first microstructure, disposed on the first surface and comprising a plurality of protrusions, wherein the protrusions are evenly distributed from the light incident surface to a direction away from the light incident surface;
a second microstructure, disposed on the first surface, and covering a portion of the first microstructure; and
a third microstructure, disposed on the second surface.
15 . The reflective display device of claim 14 , wherein a material of the main body comprises glass.
16 . The reflective display device of claim 14 , wherein an air gap exists between the light guide plate and the cover plate.
17 . The reflective display device of claim 16 , wherein a difference between a refractive index of the first microstructure and a refractive index of the air gap is not less than 0.35.
18 . The reflective display device of claim 16 , wherein a difference between a refractive index of the second microstructure and a refractive index of the air gap is not less than 0.35.
19 . The reflective display device of claim 14 , wherein a refractive index of the second microstructure is not greater than a refractive index of the main body and is not greater than a refractive index of the first microstructure, wherein the second microstructure comprises a plurality of dots, and the dots are distributed from dense to sparse from the light incident surface to the direction away from the light incident surface.
20 . The reflective display device of claim 14 , wherein a refractive index of the second microstructure is greater than a refractive index of the main body and is greater than a refractive index of the first microstructure, wherein the second microstructure comprises a plurality of dots, and the dots are distributed from sparse to dense from the light incident surface to the direction away from the light incident surface.