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. 17, 2011
Filed:
Dec. 26, 2006
Shuichi Naijo, Chiba, JP;
Shuji Gomi, Chiba, JP;
Takeo Watanabe, Chiba, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
A light guide member capable of reducing an unevenness of luminescent color and further a nonuniformity in luminance when obtaining a white color by a color mixture using a plurality of light sources. Also disclosed are a flat light source device and a display device. A protrusion () of a cylindrical shape is formed upward a plurality color of LED light sourcesR,G,B, e.g., RGB color at a backside face of a light guide member (), and a conical depression () is disposed at the position directly over the protrusion. Lights of each color from LED light sourcesR,G,B are mixed at the protrusion (), thereafter reflect at the depression () and propagate in a horizontal direction at a light guide portion ().