Uniform curved surface structure of a brightness unit for a brightness enhancement film

• US 6,759,113 B1
• Filed: 05/06/2003
• Issued: 07/06/2004
• Est. Priority Date: 03/24/2003
• Status: Active Grant

• Current Assignee: Zhejiang Jinhui Optoelectronic Material Co., Ltd
• Original Assignee: Shih-Chieh Tang
• Inventors: Tang, Shih-Chieh
• Primary Examiner(s): Loney, Donald J.
• Application Number:
  US10/429,719
• Time in Patent Office: 427 Days
• Field of Search: 428/141, 428/156, 428/167, 428/172, 428/409, 428/913, 359/321, 359/454, 359/459, 359/530
• US Class Current: 428/156
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/2457 Parallel ribs and/or grooves

Abstract

A brightness enhancement film includes a top surface, a bottom surface and a plurality of brightness units arranged to form an array on the top surface. The brightness unit is consisted of a first cured surface and a second curved surface. Each of the first cured surface and the second curved surface is extended downward to terminate at a curved bottom edge so as to form a uniform curvature of the curved surface.

Claims

1. A brightness enhancement film having a uniform curved surface structure, comprising:

a waved film including a top surface and a bottom surface through which penetrating light that is refracted;

a plurality of brightness units arranged on the top surface of the waved film to form an array, each of the brightness units able to refract light in two dimensions for condensing light; and

a plurality of curved bottom edges located at a bottom portion of each of the brightness units so that an adjacent surface to the curved bottom edge formed with a uniform curved surface that has an adequate curvature to generate a two-dimensional retraction with respect to the top surface of the wave film.

2. The brightness enhancement film having the uniform curved surface structure as defined in claim 1, wherein each of the brightness units is comprised of a first curved surface and a second curved surface;

the first curved surface and the second curved surface are extended downward and terminated at a first curved bottom edge and a second curved bottom edge respectively that the curved surfaces adjacent to the curved bottom edges have uniform curvatures.

3. The brightness enhancement film having the uniform curved surface structure as defined in claim 1, wherein the brightness units are arranged in disorder to form the waved film.