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:
Nov. 09, 2010
Filed:
Dec. 14, 2005
Takashi Kunimatsu, Osaka, JP;
Takashi Kunimatsu, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A light emitting diode drives a semiconductor circuit in order to drive a light emitting diode that emits light by applying the output voltage of the rectifier circuit. The light emitting diode includes a switching element connected between the light emitting diode and the ground potential. An input voltage detection circuit detects the output voltage of the rectifier circuit to output a light emitting signal or a extinction signal. A current detection circuit detects the current flowing into the switching element. A control circuit intermittently controls on/off of the switching element at a predetermined oscillating frequency based on the output signal of the current detection circuit while the input voltage detection circuit is outputting the light emitting signal.