Patent ID: 7034787

Claim:
An output circuit for gray scale control, comprising: a power-supply voltage supply unit; a first current supply unit; a first MISFET which is provided between the first current supply unit and the power-supply voltage supply unit and has a gate electrode connected to the power-supply voltage supply unit; a plurality of gray scale control units each having an output buffer unit including a first transistor, and a differential circuit including a second transistor which constitutes a current mirror together with the first transistor; a bias supply line which is connected to the gate electrode of the first MISFET and controls currents flowing to the first transistor and the second transistor; a first power-supply voltage supply wire connected to the power-supply voltage supply unit for supplying a power-supply voltage to the output buffer unit; and a second power-supply voltage supply wire connected to the power-supply voltage unit for supplying the power-supply voltage to the differential circuit.