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:
Sep. 26, 2006
Filed:
Apr. 10, 2002
Hidenao Kubota, Yokohama, JP;
Hirofumi Sakamoto, Fujisawa, JP;
Masahiko Umeda, Yokohama, JP;
Masatoshi Sudo, Yokohama, JP;
Hidenao Kubota, Yokohama, JP;
Hirofumi Sakamoto, Fujisawa, JP;
Masahiko Umeda, Yokohama, JP;
Masatoshi Sudo, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention solves the problem that the color temperature of initial setting is changed, when a PDP is driven for a long period of time, due to the non-uniform deterioration of red, green and blue fluorescent materials that is caused by the ultraviolet rays generated for discharge. Color temperature correction is performed by setting the numbers of discharge pulses for fluorescent materials in accordance with a discharge pulse number correction curve with respect to the cumulative elapsed driven time of a PDP.