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:
Mar. 20, 2012
Filed:
Mar. 26, 2009
Hirofumi Konishi, Osaka, JP;
Shin Ukegawa, Kyoto, JP;
Minoru Maehara, Osaka, JP;
Masanao Okawa, Nara, JP;
Hirofumi Takaki, Aichi, JP;
Hirofumi Konishi, Osaka, JP;
Shin Ukegawa, Kyoto, JP;
Minoru Maehara, Osaka, JP;
Masanao Okawa, Nara, JP;
Hirofumi Takaki, Aichi, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
Provision of a light emitting device having functionality for restoring to normal even if a low-voltage error occurs, by temporarily applying a reverse current to a low-voltage error light emitting element using a direction inverting circuit, and repairing portions in which impedance has fallen by applying the current. An illuminating device of a light emitting device using a lamp (light emitting element) is provided with a control power source circuit for generating a control voltage, a step-down chopper circuit for converting a direct-current voltage into power needed for the lamps comprising organic electroluminescent elements as light emitting elements, a lamp current detecting circuit for detecting a current flowing to the lamps, a direction inverting circuit including a plurality of lamps and capable of inverting the direction of the connection of the plurality of lamps, a control circuit for generating a control signal for supplying desired power to the lamps, and the lamp current command circuit for controlling the current flowing to the lamps.