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:
Jan. 16, 2007
Filed:
Jan. 28, 2004
Seiichi Mizukoshi, Kanagawa, JP;
Nobuyuki Mori, Saitama, JP;
Kouichi Onomura, Kanagawa, JP;
Makoto Kohno, Kanagawa, JP;
Seiichi Mizukoshi, Kanagawa, JP;
Nobuyuki Mori, Saitama, JP;
Kouichi Onomura, Kanagawa, JP;
Makoto Kohno, Kanagawa, JP;
Eastman Kodak Company, Rochester, NY (US);
Abstract
To appropriately adjust luminance and a black level even when characteristics of an organic EL display element should be changed due to an environmental change or heat self-generation, to display a stable image. A current detector detects a level of a total panel current flowing in an organic EL panel. The detected level is subjected to A/D conversion before being supplied to an adder. Meanwhile, a video signal is supplied to a current calculatorto be converted into data corresponding to the level of a total panel current, before being supplied to the adder. The adder then compares an average total panel current level, estimated based on a video signal, and an actual total panel current level, to obtain a difference so that a black level for image data to be supplied to the panel is adjusted according to the difference.