Composite micro-structured sheet for diffusing and condensing light

• US 20050013001A1
• Filed: 09/24/2003
• Published: 01/20/2005
• Est. Priority Date: 07/17/2003
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Jain-Sh, Pao, Yu-Nan, Pan, I-Kai, Yau, Po-Hung
• Application Number:
  US10/668,172
• Publication Number:
  US 20050013001A1
• Time in Patent Office: Days
• US Class Current: 359/599
• CPC Class Codes: G02B 3/005 arranged along a single direction only, e.g. lenticular sheets G02B3/0043 takes precedence
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: G02B 5/0215 the surface having a regular structure
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/045 Prism arrays

Abstract

A composite micro-structured sheet for diffusing and condensing light is disclosed, which includes a substrate having a top surface and a bottom surface, wherein a plurality of straight trenches with an arc cross-section or an micro-lens array is formed on the bottom surface for diffusing the incident light on the bottom surface, and a plurality of rhombus protrusions is formed on the top surface for raising the semi-brightness angle of the light that has passed through the bottom surface.

Claims

1. A composite micro-structured sheet for diffusing and condensing light comprising a substrate having a top surface and a bottom surface, wherein a plurality of straight trenches with an arc cross-section or a micro-lens array is formed on the bottom surface for diffusing the incident light on the bottom surface, and a plurality of rhombus protrusions is formed on the top surface for raising the semi-brightness angle of the light that has passed through the bottom surface.

2. The composite micro-structured sheet as claimed in claim 1, wherein the substrate is made of polymethyl mathacrylate (PMMA) or polycarbonate (PC).

3. The composite micro-structured sheet as claimed in claim 1, wherein each straight trench with an arc cross-section is constructed of a convex pillar lens array or a concave pillar lens array.

4. The composite micro-structured sheet as claimed in claim 1, wherein the micro-lens array is composed of a convex lens array or a concave lens array.

5. The composite micro-structured sheet as claimed in claim 3, wherein the size and focal length of the lenses of the convex pillar lens array or the concave pillar lens array are all the same.

6. The composite micro-structured sheet as claimed in claim 4, wherein the spaces between the lenses of the convex lens array or the concave lens array are different.

7. The composite micro-structured sheet as claimed in claim 1, wherein the rhombus protrusions are parallel to each other.

8. The composite micro-structured sheet as claimed in claim 1, wherein an included angle between each straight trench with an arc cross-section and the respective rhombus protrusion ranges from 0 to 90 degrees.