Patent ID: 6970162

Claim:
An image display apparatus comprising: wiring; a circuit which applies a predetermined potential to said wiring as a potential of a signal to be supplied to said wiring; and an image forming device which is set in a driven state when a voltage is applied to said image forming device by supplying the signal to said wiring, the circuit having: a final output section which outputs the signal to said wiring, a pre-stage output section which is connected as a stage before said final output section, and which outputs a control signal for on/off control of said final output section, and a power supply which supplies a potential to said pre-stage output section, wherein said final output section has such a characteristic that its ON resistance is determined according to an amplitude value of the control signal input from said pre-stage output section, said pre-stage output section has a final output section control circuit which changes the amplitude of the control signal according to the potential supplied from said power supply, and said power supply comprises a variable power supply capable of changing the potential to be supplied, and a constant power supply for supplying a predetermined potential, and said final output section control circuit includes a power supply change circuit which selectively outputs the potentials supplied from said variable power supply and said constant power supply.