DC VOLTAGE CONVERSION CIRCUIT OF LIQUID CRYSTAL DISPLAY APPARATUS

摘要

PURPOSE: A direct current voltage conversion circuit of a liquid crystal display device is provided to correspond to the dispersion of broad threshold voltage by applying positive gate source voltage when turning on a TFT(Thin Film Transistor), and applying negative gate source voltage when turning off the TFT. CONSTITUTION: A main pumping circuit part(710) comprises multiple TFTs(M1-M8). The multiple TFTs are turned on and off by turns. A main pumping circuit part outputs voltage for driving a liquid crystal display device. A switch control signal generating part(720) controls the voltage applied to the gate of multiple thin film transistors with a clock signal inversion.