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:
Jun. 07, 2005
Filed:
May. 29, 2003
Applicants:
Norikazu Yamamoto, Yawata, JP;
Teruaki Shigeta, Neyagawa, JP;
Nobuhiro Shimizu, Nara, JP;
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F001/00 ;
U.S. Cl.
CPC ...
Abstract
A discharge lamp device which drives a discharge tube filled with a rare gas and has a first electrode mounted at the inside of the tube and a second electrode mounted at the outside of the tube. The lamp device includes a driving circuit that applies a voltage between the first and second electrodes. The driving circuit applies a positive rectangular wave voltage to the first electrode with a potential of the second electrode being a reference potential (0V) A backlight includes at least one discharge tube and the discharge lamp device.