Light guide plate and light source module

Patent metadata

Field	Value
Publication number	US-9568663-B2
Application number	US-201414505511-A
Country	US
Kind code	B2
Filing date	Oct 3, 2014
Priority date	Oct 3, 2014
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A light guide plate including a first substrate, a second substrate opposite to the first substrate, a plurality of first microstructures, a plurality of second microstructures, and a plurality of third microstructures is provided. The first substrate has a light emitting surface, a first bottom surface, and a light incidence surface. The second substrate has a top surface and a second bottom surface. The top surface is located between the first substrate and the second bottom surface. The first microstructures and the second microstructures are disposed on the light emitting surface and the second bottom surface respectively and extend along a first direction parallel to the light incidence surface respectively. The third microstructures are connected between the first bottom surface and the top surface and extend along a second direction perpendicular to the light incidence surface respectively. A light source module is also provided.

First claim

What is claimed is:

1. A light guide plate, adapted to be disposed beside a light source, the light guide plate comprising:
a first substrate, having a light emitting surface, a first bottom surface, and a light incidence surface, wherein the first bottom surface is opposite to the light emitting surface, the light incidence surface connects the light emitting surface and the first bottom surface, and the light source is disposed beside the light incidence surface;
a second substrate, opposite to the first substrate, wherein the first bottom surface is located between the light emitting surface and the second substrate,
the second substrate has a top surface and a second bottom surface, and the top surface is opposite to the second bottom surface and located between the first substrate and the second bottom surface;
a plurality of first microstructures, disposed on the light emitting surface and respectively extending along a first direction parallel to the light incidence surface;
a plurality of second microstructures, disposed on the second bottom surface, and respectively extending along the first direction; and
a plurality of third microstructures, connected between the first bottom surface and the top surface, and respectively extending along a second direction perpendicular to the light incidence surface.

2. The light guide plate as claimed in claim 1 , wherein each of the first microstructures has a first side surface and a first light guide surface, the first side surface is located between the first light guide surface and the light incidence surface, and an included angle between the first light guide surface and the light emitting surface in the first substrate is greater than 0 degrees and smaller than or equal to 5 degrees, and each of the second microstructures has a second side surface and a second light guide surface, the second side surface is located between the second light guide surface and the light incidence surface, and an included angle between the second light guide surface and the second bottom surface in the second substrate ranges from 25 degrees to 35 degrees.

3. The light guide plate as claimed in claim 1 , wherein each of the third microstructures has a first connection surface, a second connection surface, a third connection surface, and a fourth connection surface, the first connection surface is connected to the first bottom surface, the second connection surface is connected to the top surface, the third connection surface and the fourth connection surface are respectively connected between the first connection surface and the second connection surface, and a width of the first connection surface in the first direction is less than a width of the second connection surface in the first direction.

4. The light guide plate as claimed in claim 3 , wherein an included angle between the third connection surface and the top surface in the third microstructure ranges from 60 degrees to 70 degrees, and an included angle between the fourth connection surface and the top surface in the third microstructure ranges from 60 degrees to 70 degrees.

5. The light guide plate as claimed in claim 1 , wherein the first substrate, the second substrate, the first microstructures, the second microstructures, and the third microstructures are formed of the same material.

6. The light guide plate as claimed in claim 1 , wherein the light emitting surface, the first bottom surface, the top surface, and the second bottom surface are parallel to each other.

7. The light guide plate as claimed in claim 1 , further comprising:
a reflective layer, disposed on the second microstructures and on an area of the second bottom surface that is not covered by the second microstructures.

8. A light source module, comprising:
a light source; and
a light guide plate, comprising:
a first substrate, having a light emitting surface, a first bottom surface, and a light incidence surface, wherein the first bottom surface is opposite to the light emitting surface, the light incidence surface connects the light emitting surface and the first bottom surface, and the light source is disposed beside the light incidence surface;
a second substrate, opposite to the first substrate, wherein the first bottom surface is located between the light emitting surface and the second substrate, the second substrate has a top surface and a second bottom surface, and the top surface is opposite to the second bottom surface and located between the first substrate and the second bottom surface;
a plurality of first microstructures, disposed on the light emitting surface and respectively extending along a first direction parallel to the light incidence surface;
a plurality of second microstructures, disposed on the second bottom surface, and respectively extending along the first direction; and
a plurality of third microstructures, connected between the first bottom surface and the top surface, and respectively extending along a second direction perpendicular to the light incidence surface.

9. The light source module as claimed in claim 8 , wherein each of the first microstructures has a first side surface and a first light guide surface, the first side surface is located between the first light guide surface and the light incidence surface, and an included angle between the first light guide surface and the light emitting surface in the first substrate is greater than 0 degrees and smaller than or equal to 5 degrees, and each of the second microstructures has a second side surface and a second light guide surface, the second side surface is located between the second light guide surface and the light incidence surface, and an included angle between the second light guide surface and the second bottom surface in the second substrate ranges from 25 degrees to 35 degrees.

10. The light source module as claimed in claim 8 , wherein each of the third microstructures has a first connection surface, a second connection surface, a third connection surface, and a fourth connection surface, the first connection surface is connected to the first bottom surface, the second connection surface is connected to the top surface, the third connection surface and the fourth connection surface are respectively connected between the first connection surface and the second connection surface, and a width of the first connection surface in the first direction is less than a width of the second connection surface in the first direction.

11. The light source module as claimed in claim 10 , wherein an included angle between the third connection surface and the top surface in the third microstructure ranges from 60 degrees to 70 degrees, and an included angle between the fourth connection surface and the top surface in the third microstructure ranges from 60 degrees to 70 degrees.

12. The light source module as claimed in claim 8 , wherein the first substrate, the second substrate, the first microstructures, the second microstructures, and the third microstructures are formed of the same material.

13. The light source module as claimed in claim 8 , wherein the light emitting surface, the first bottom surface, the top surface, and the second bottom surface are parallel to each other.

14. The light source module as claimed in claim 8 , wherein the light guide plate further comprises a reflective layer, and the reflective layer is disposed on the second microstructures and on an area of the second bottom surface that is not covered by the second microstructures.

15. The light source module as claimed in claim 8 , further comprising:
a diffuser, wherein the first microstructures

Assignees

• Winbond Electronics Corp

Inventors

• Pan Jui-Wen
• Chiang Che-Wen
• Li Chang-Yi
• Huang Yung-Chih

Classifications

• G02B6/0038

  Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide · CPC title

• G02B6/0053 Primary

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title