BACKLIGHT INVERTER OF LCD

摘要

PURPOSE: A backlight inverter is provided to prevent a mis-operation at an initial driving state while performing a stable output control against the change of input voltage at an opening of a corresponding lamp when plural lamps are used for a backlight. CONSTITUTION: Rectifiers are equipped in each feedback signal to detect the size of voltage according to an on/off status of each backlight lamp. The rectifiers level the input feedback signals. Switching devices are turned on/off according to the state of the rectified feedback signals by connecting with the rectifiers one to one. A comparator receives and compares a reference voltage through a non-inversion terminal and a charging voltage of a condenser in an inversion terminal, feeds a voltage signal according to the compared result to a buck switch and controls the operation of the buck switch. A charging/discharging path control device forms charging/discharging paths of the condenser to be accessed to the inversion terminal of the comparator according to the on/off state of the switching devices.