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:
Dec. 02, 2008
Filed:
Aug. 22, 2006
Nobuaki Honbo, Kawasaki, JP;
Nobuaki Honbo, Kawasaki, JP;
NEC LCD Technologies, Ltd., Kanagawa, JP;
Abstract
A cold cathode tube lighting device is provided which is capable of achieving stable luminance when driven by applying driving pulses to input terminals on both sides of each of two or more cold cathode tubes. Each of currents flowing through coils in each of coil units on both sides of each of two or more cold cathode tubes is detected by voltage detecting sections and a tube current flowing through each of the cold cathode tubes based on a value obtained by adding each of the currents using an adder and a duty ratio of each of driving pulses is controlled so that the tube current becomes a specified current value to keep the luminance of the cold cathode tubes constant.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile