DRIVE DEVICE FOR LIQUID CRYSTAL DISPLAY DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A power supply IC adjusts the frequency of a clock signal outputted from an EXT terminal such that the voltage inputted into a VFB terminal turns to a desired voltage. The power supply IC outputs a clock signal when the control signal inputted into the OE terminal is turned on. The control unit turns on the control signal only in a period that has a time length obtained by adding a slight allowance time to the period required for completion of pixel charge and turns off the control signal upon lapse of the time length. Thus, the power supply circuit outputs an analog voltage only in an initial part in one horizontal period and outputs no analog voltage in the remaining part of the one horizontal period.