Patent ID: 6950080

Claim:
An active matrix display device comprising: a plurality of gate signal lines disposed in one direction on a substrate; a plurality of drain signal lines disposed in a direction different from the direction of the gate signal lines; a plurality of pixel element electrodes each selected in response to a scanning signal fed from one of the gate signal lines and each provided with an image signal fed from one of the drain signal lines; a plurality of retaining circuits disposed corresponding to the pixel element electrodes, each of the retaining circuits retaining a voltage according to the image signal; and a voltage booster circuit elevating a power supply voltage fed from outside of the display device, wherein the display device has a normal operation mode in which an analog image is formed based on the image signal, and a memory operation mode in which a digital image is formed based on the voltages retained by the retaining circuits, the retaining circuits using an output of the voltage booster circuit as a power supply voltage in the memory operation mode.