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:
Apr. 04, 2006
Filed:
May. 07, 2004
Chin-wen Chou, Hsin-Tien, TW;
Eddie Cheng, Hsin-Tien, TW;
Kuang-ming Wu, Hsin-Tien, TW;
Chin-biau Chung, Hsin-Tien, TW;
Chin-Wen Chou, Hsin-Tien, TW;
Eddie Cheng, Hsin-Tien, TW;
Kuang-Ming Wu, Hsin-Tien, TW;
Chin-Biau Chung, Hsin-Tien, TW;
Zippy Technology Corp., Taipei Hsien, TW;
Abstract
A method and apparatus for modulating light of CCFLs that couples frequency alteration and pulse width modulation (PWM) approaches to change output voltage and current of a piezoelectric transformer to modulate the luminosity of a CCFL. The invention includes a PWM controller to alter operation cycle and a frequency control IC to change resonant frequency that drives the piezoelectric transformer at different operation cycles thereby to modulate the luminosity of the CCFL and improve the life span of the piezoelectric transformer.