METHOD FOR DRIVING LAMP OF BACKLIGHT CONTROL CIRCUIT

摘要

A backlight control circuit includes a secondary winding, a control circuit, a first circuit including a first capacitor and a first switching element, and a second circuit including a second switching element and a reactance element. A method for driving the backlight control circuit includes the control circuit switching off the first switching element, and the secondary winding outputting a startup AC voltage to the lamp. A first resonant circuit which includes the lamp, the secondary winding and the first circuit is formed, with a first resonant frequency suitable to light up the lamp. The control circuit switches on the first switching element, and the secondary winding outputs an operation AC voltage to the lamp. A second resonant circuit which includes the lamp, the secondary winding, the first and second circuit is formed, with a second resonant frequency suitable to keep the lamp lighted.