Patent ID: 7136057
Filing Date: 2006-11-14
Classification: G09G

Abstract:
1. 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; an oscillation circuit outputting a first AC signal and a second AC signal; a voltage booster circuit disposed on the substrate; and a plurality of circuit selection transistors each connected between the corresponding retaining circuits and the corresponding pixel element electrodes, wherein the display device has a normal operation mode in which voltages corresponding to the image signal are supplied to the pixel element electrodes, and a memory operation mode in which the first AC signal or the second AC signal corresponding to the voltage retained by the retaining circuit is supplied to a corresponding pixel element electrode, and the circuit selection transistors turning on in the memory operation mode, and the first and second AC signals supplied to the pixel element electrodes in the memory operation mode being supplied to the pixel element electrodes through the circuit selection transistors, and wherein a voltage applied to gates of the circuit selection transistors is constant and higher than a highest voltage of the first and second AC signals and is a voltage that is generated by the voltage booster circuit.