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. 15, 2014
Filed:
Oct. 17, 2011
Kazuma Kitadani, Suwa, JP;
Kazuma Kitadani, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An illumination device includes an organic EL panel having a light emission layer provided between a first electrode and a second electrode, a power source, a power switcher, a control circuit, and a plurality of power supply portions connected to the first electrode. The control circuit controls the power switcher in such a way that, when a first power supply portion of the plurality of power supply portions is connected to the power source, a second power supply portion is not connected to the power source. The power supply portions that supply power to the first electrode are switched sequentially at a high speed. Therefore, a user will feel as if the illumination device emits light without any unevenness of brightness two-dimensionally.