Patent ID: 7119781

Claim:
A precharge system, appropriate for an active matrix display device having a plurality of data lines, a plurality of scan lines, a plurality of pixels, a first voltage source, and a second voltage source, comprising a precharge circuit having: a plurality of first transistors, having gate electrode and drain electrode connected together to function as a diode, of which a first terminal is coupled to the first voltage source; a second transistor of which a first terminal is coupled to the second terminals of the first transistors, of which a second terminal is coupled to the data lines, and a control terminal receives a positive precharge signal; a plurality of third transistors, having gate electrode and drain electrode connected together to function as a diode, of which a first terminal is coupled to the second voltage source; and a fourth transistor of which a first terminal is coupled to the second terminals of the third transistors, of which a second terminal is coupled to the corresponding data lines, and a control terminal receives a negative precharge signal.