Patent Number: 7,786,680

Title: High efficiency and low cost cold cathode fluorescent lamp driving apparatus for LCD backlight

Abstract: The invention is a driving apparatus and circuit for efficiently converting a direct current (DC) signal into an alternating current (AC) signal to drive a fluorescent lamp. A semi class E configuration which utilizes only one transistor is employed in the invention. The invention comprises a power transistor, a transformer wherein a primary winding is used as a load for the power transistor and a secondary winding is used to transfer energy to the load for the driving apparatus, i.e. the CCFL tube, and control means which extracts the frequency and current of the power transistor and corrects the deviation between the frequency of the power transistor and that of the control means.

Inventors: Bai; Shwang-Shi (Tainan, TW), Huang; Yu-Pei (Tainan, TW), Liang; Shen-Yao (Tainan, TW), Chang; Shu-Ming (Tainan, TW)

Assignee: Himax Technologies Limited

International Classification: H05B 37/02 (20060101)

Expiration Date: 8/31/12018