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:
Aug. 10, 2010
Filed:
Jun. 29, 2005
Yasuhiro Kumamoto, Osaka, JP;
Yasuhiro Kumamoto, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A black insertion dimming PWM generation portion () outputs a black insertion PWM pulse VBL to drive a fluorescent lamp () in such a manner that a black insertion period during which the fluorescent lamp () is lit OFF and a light-ON period during which the fluorescent lamp () is lit ON are provided within one vertical period. A luminance dimming PWM generation portion () outputs a dimming PWM pulse Vpwmto PWM-drive the fluorescent lamp () so as to be lit ON and lit OFF repetitively during the light-ON period. An AND circuit () outputs an inverter driving signal Voutgenerated by superimposing the dimming PWM pulse Vpwmand the black insertion PWM pulse VBL. An inverter () drives the fluorescent lamp () by applying a voltage corresponding to the inverter driving signal Voutto the fluorescent lamp ().