Patent ID: 8605070

Claim:
An operational amplifier comprising: an output circuit that outputs a voltage in a voltage range determined either from a highest voltage that is an upper limit of a predetermined power source range, or from a lowest voltage that is a lower limit of the predetermined power source range, to an intermediate voltage that is a voltage between the highest voltage and the lowest voltage; and a differential circuit comprising a first MOS transistor to which a driving signal for driving a display cell of a display panel is input and a second MOS transistor to which a given input signal is input, the first MOS transistor and the second MOS transistor being connected in parallel, and a differential input-permissible-range of the differential circuit being larger than the voltage range of the output circuit, wherein the first MOS transistor and the second MOS transistor are NMOS transistors, and the differential input-permissible-range has an upper limit of the highest voltage and a lower limit of a given voltage between the lowest voltage and the intermediate voltage.