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:
Jul. 01, 2008
Filed:
Apr. 10, 2006
Applicants:
Seiji Sakai, Tokyo, JP;
Toshiyuki Yoneda, Tokyo, JP;
Inventors:
Seiji Sakai, Tokyo, JP;
Toshiyuki Yoneda, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F21V 7/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A planar light source device includes a light source section having a plurality of light emitting diodes as a light source, and a light guiding plate guiding light from the light source section to emit planar light. The light emitting diodes being turned off detect the quantities of light from the other light emitting diodes, and adjust the quantities of light emission of the other light emitting diodes based on the detected quantities of light.