Patent ID: 7184285

Claim:
A DC—DC conversion circuit, comprising: a first reference voltage source; a first capacitor in which a first clock signal source is connected to one end; a second capacitor of which one end is connected to a second clock signal source which outputs an inverted signal of a first clock signal; a third capacitor for outputting a voltage outputted from the first reference voltage source and boosted; a first n-ch thin film transistor of which gate is connected to the other end of the first capacitor, source is connected to the first reference voltage source, and drain is connected to the other end of the second capacitor; a first p-ch thin film transistor of which gate is connected to the other end of the first capacitor, source is connected to the third capacitor, and drain is connected to the other end of the second capacitor; a first diode connected in a forward direction from the other end of the first capacitor toward the first reference voltage source; a second n-ch thin film transistor of which gate is connected to the other end of the second capacitor, source is connected to the first reference voltage source, and drain is connected to the other end of the first capacitor; and a second p-ch thin film transistor of which gate is connected to the other end of the second capacitor, source is connected to the third capacitor, and drain is connected to the other end of the first capacitor.