The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 2012
Filed:
Aug. 25, 2008
Applicants:
Hirokazu Aritake, Kawasaki, JP;
Satoshi Maeda, Kawasaki, JP;
Inventors:
Hirokazu Aritake, Kawasaki, JP;
Satoshi Maeda, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
Abstract
LEDs (light sources) are disposed in a row in the width direction of a light-guiding plate near the edge surface of the light-guiding plate. In the edge surface of the light-guiding plate, diffractive optical elements (DOEs) are disposed to face the LEDs, respectively. These DOEs are constituted of binary concave and convex patterns, and the diffusion angle of the DOEs disposed near the center is set smaller than that of the other DOEs disposed near the edge.