Optical assembly

• US 20090147539A1
• Filed: 07/18/2008
• Published: 06/11/2009
• Est. Priority Date: 12/07/2007
• Status: Abandoned Application

• Current Assignee: Lite-On Technology Corporation, Silitek Electronic Company Limited (Lite-On Technology Corporation)
• Original Assignee: Lite-On Technology Corporation, Silitek Electronic Company Limited (Lite-On Technology Corporation)
• Inventors: Chen, Ching-Hung, Wang, Hsu-Tsu, Wang, Tzu-Wei, Tsai, Tzeng-Guang
• Application Number:
  US12/219,277
• Publication Number:
  US 20090147539A1
• Time in Patent Office: Days
• US Class Current: 362/623
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Abstract

An optical assembly includes a light source for generating and emitting light, a light guide plate, and a light transmissive plate. The light transmissive plate is disposed above the light guide plate and has a plurality of asymmetric V-shaped structures on a bottom surface thereof. The V-shaped structures may divert the light emitted from an optical element to exit at a collimation angle, thereby enhancing a light utilization, reducing loss of the light, and facilitating the enhancement of a positive gray level. Further, the optical assembly has a simple structure and a low cost.

Claims

1. An optical assembly, comprising:

a light source, for generating and emitting light;

a light guide plate, having a first light incident surface, a first light reflecting surface and a first light-exiting surface connected to the first light incident surface respectively, wherein light emitted from the light source are incident into the first light incident surface, and the first light-exiting surface and the first light reflecting surface are disposed opposite to each other; and

a light transmissive plate, having a bottom surface and a second light-exiting surface, wherein the light transmissive plate and the light guide plate are disposed opposite to each other, so that the bottom surface faces the first light-exiting surface of the light guide plate and the bottom surface has a plurality of V-shaped structures.

2. The optical assembly according to claim 1, wherein the V-shaped structures are asymmetric V-shaped structures.

3. The optical assembly according to claim 1, wherein the V-shaped structures are bar-shaped structures arranged side by side.

4. The optical assembly according to claim 1, wherein the V-shaped structures and the light transmissive plate are integrally formed.

5. The optical assembly according to claim 1, wherein the light transmissive plate is a plastic plate.

6. The optical assembly according to claim 1, wherein each of the V-shaped structures has a second incident surface, and an included angle formed between the second incident surface and the bottom surface of the light transmissive plate is in a range of 70°

-115°

.

7. The optical assembly according to claim 1, wherein each of the V-shaped structures has a second light reflecting surface, and a included angle formed between the second light reflecting surface and the light transmissive plate is in a range of 30°

-60°

.

8. The optical assembly according to claim 1, wherein the second light-exiting surface has a plurality of rectangular pyramids.

9. The optical assembly according to claim 8, wherein the rectangular pyramids are distributed in an array on the second light-exiting surface.

10. The optical assembly according to claim 8, wherein the rectangular pyramids and the light transmissive plate are integrally formed.