Light source module

Patent metadata

Field	Value
Publication number	US-2018106950-A1
Application number	US-201715499675-A
Country	US
Kind code	A1
Filing date	Apr 27, 2017
Priority date	Oct 19, 2016
Publication date	Apr 19, 2018
Grant date	—

Abstract

A light source module includes a light guide plate, a light source, a first prism sheet and a reflection sheet. The light guide plate includes a light exit surface, a bottom surface opposite to the light exit surface, and a light entrance surface connected to the light exit surface and the bottom surface. The light source is disposed beside the light entrance surface and adapted to emit a light beam to the light entrance surface. The first prism sheet is disposed on the light exit surface and includes first prism units. A surface of the first prism units faces away from the light exit surface. The reflection sheet is disposed on the bottom surface. The light guide plate is located between the reflection sheet and the first prism sheet. The reflection sheet includes microstructures. A surface of the microstructures faces the bottom surface of the light guide plate.

First claim

What is claimed is:

1 . A light source module, comprising:
a light guide plate, comprising a light exit surface, a bottom surface opposite to the light exit surface, and a light entrance surface connected to the light exit surface and the bottom surface; a light source, disposed beside the light entrance surface of the light guide plate, wherein the light source is adapted to emit a light beam to the light entrance surface; a first prism sheet, disposed on the light exit surface of the light guide plate and comprising a plurality of first prism units, wherein a surface of the first prism units faces away from the light exit surface; and a reflection sheet, disposed on the bottom surface of the light guide plate, wherein the light guide plate is located between the reflection sheet and the first prism sheet, the reflection sheet comprises a plurality of microstructures, and a surface of the microstructures faces the bottom surface of the light guide plate.

2 . The light source module according to claim 1 , wherein the reflection sheet further comprises a substrate, the substrate has a top surface facing the bottom surface, the microstructures are connected to the top surface, the surface of each one of the microstructures comprises a first slope surface adjacent to the light source and a second slope surface far away the light source, the first slope surface adjoins the second slope surface, a first included angle is between the first slope surface and the top surface, and a second included angle is between the second slope surface and the top surface.

3 . The light source module according to claim 2 , wherein an angle of the first included angle is θ 1 , and 16 degrees≤θ 1 ≤55 degrees.

4 . The light source module according to claim 3 , wherein an angle of the second included angle is θ 2 , and 16 degrees≤θ 2 ≤55 degrees.

5 . The light source module according to claim 1 , wherein the first prism units of the first prism sheet have a first extending direction, and the first extending direction is parallel with the light entrance surface of the light guide plate.

6 . The light source module according to claim 1 , further comprising a second prism sheet, wherein the first prism sheet is located between the second prism sheet and the light exit surface of the light guide plate, the second prism sheet comprises a plurality of second prism units, and a surface of the second prism units faces away from the light exit surface.

7 . The light source module according to claim 6 , wherein the first prism units have a first extending direction, the second prism units have a second extending direction, the first extending direction is parallel with the light entrance surface of the light guide plate, and the second extending direction is perpendicular to the first extending direction.

8 . The light source module according to claim 6 , wherein the first prism sheet further comprises a first substrate, the first substrate has a first surface and a second surface opposite to the first surface, the first surface is opposite to the light exit surface of the light guide plate, and the first prism units are disposed on the second surface.

9 . The light source module according to claim 8 , wherein the second prism sheet further comprises a second substrate, the second substrate has a third surface and a fourth surface opposite to the third surface, the third surface is opposite to the second surface of the first substrate, and the second prism units are disposed on the fourth surface.

10 . The light source module according to claim 1 , further comprising a diffusion sheet, wherein the first prism sheet is located between the diffusion sheet and the light guide plate, and the surface of the first prism units of the first prism sheet faces the diffusion sheet.

11 . The light source module according to claim 1 , wherein the microstructures of the reflection sheet are adapted to reflect a portion of the light beam passing through the bottom surface to form a reflection light beam transmitted toward the light guide plate, the reflection light beam is emitted out from the light exit surface, an included angle is between the reflection light beam and a normal line of the light exit surface, an angle of the included angle is θ, and 30 degrees≤θ≤60 degrees.

12 . The light source module according to claim 11 , wherein the reflection light beam passing through the first prism sheet overlaps the normal line of the light exit surface.

Assignees

• Young Lighting Technology Inc

Inventors

• Kuo Hao-Jan
• Weng Chao-Hung
• Ke Ming-Ta

Classifications

• G02B6/0053 Primary

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

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02B6/0033

  Means for improving the coupling-out of light from the light guide · CPC title