Method for actuating radio frequency transformer for brightness control of cold cathode lamp in backlight of LCD, involves providing nominal pulse width for pulses in nominal phase, which is completed when check signal is eliminated

摘要

The method involves connecting a transformer with a high frequency voltage (8) at an on-interval. The on-interval is divided into three phases such as initialization phase (10), transitional phase (11), and a nominal phase (12). The initialization phase is initiated when a check signal (4) is switched on, where pulses (15) of high frequency voltage lie in the initialization phase. A nominal pulse width is provided for the pulses in the nominal phase, which is completed when the check signal is eliminated. A constant pause (19) is applied to the transformer according to the pulses.