POWER SUPPLY CIRCUIT AND DISPLAY DEVICE INCLUDING SAME

摘要

A power supply circuit including a charge pump boost section which does not cause threshold reduction even if only N-channel type transistors are used as switching elements. Control signals to be given to gate terminals of transistors (Q1, Q3) and (Q2, Q4) connected respectively to one ends of capacitors (C1) and (C2) in a boost section (11a) are generated in a drive section (11b). Clock signals (DCK2, DCK2B) whose voltages alternately change between -VDD and VDD are given, as signals obtained by shifting the levels of clock signals (DCK1, DCK1B) to be given to the other ends of the capacitors (C1, C2), to input terminals (Ti3, Ti4) connected to capacitors (C3, C4) of the drive section (11b) (VDD is an input power supply voltage from outside). Thus, the drive section (11b) generates signals whose voltages alternately change between VDD and 3VDD as the control signals.