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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.:

US 6433458 B1

PDFFull Text
Expired
Date of Patent:
Aug. 13, 2002

Filed:

Apr. 13, 2001

Method and unit for driving piezoelectric transformer used for controlling luminance of cold-cathode tube

Applicant:
Inventors:

Hiroshi Nakatsuka, Osaka, JP;

Katsunori Moritoki, Osaka, JP;

Toshiyuki Asahi, Hyogo, JP;

Kojiro Okuyama, Nara, JP;

Osamu Kawasaki, Kyoto, JP;

Assignee:

Matsushita Electric Industrial Co., Ltd., Osaka, JP;

Attorney:

Merchant & Gould PC

Primary Examiner:

Mark O Budd

Int. Cl.
CPC ...
H01L 4/108 ;
U.S. Cl.
CPC ...
H01L 4/108 ;
Abstract

A method and unit for driving a small high-efficiency piezoelectric transformer allowing a cold-cathode tube to have stable luminance by detecting only an active current flowing in the cold-cathode tube based on a phase difference between an output current and voltage of the piezoelectric transformer, removing a reactive current caused by stray capacitance formed between the cold-cathode tube and a reflector, and accurately controlling driving of the piezoelectric transformer so that a constant active current is detected.

Find Patent Forward Citations

Nakatsuka, Hiroshi. (2002). Method and unit for driving piezoelectric transformer used for controlling luminance of cold-cathode tube (U.S. Patent No. 6433458). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6433458

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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