Patent ID: 7874647

Claim:
A method for driving a liquid droplet ejecting head having a plurality of liquid droplet ejectors that eject liquid droplets from nozzles according to respective voltage changes applied to a plurality of piezoelectric elements electrically connected in a matrix including columns of piezoelectric elements and rows of piezoelectric elements, wherein a switching element is provided with respect to each piezoelectric element and capable of grounding one of a pair of terminals of the piezoelectric element, the method comprising: inputting, per unit of one column of the piezoelectric elements, a column controlling signal for switching on/off the switching element; inputting, per unit of one row of the piezoelectric elements, a row signal for switching the other of the pair of terminals of the piezoelectric element to a predetermined voltage applied state, a grounded state or an opened state; and ejecting the liquid droplet from the liquid droplet ejector by applying the voltage change between the pair of terminals of the piezoelectric element; wherein the applying the voltage change is performed by charging and discharging so as to apply a voltage having a predetermined driving waveform to between the pair of terminals of the piezoelectric element, the charging and discharging is performed by inputting, per unit of one column of the piezoelectric elements, the column controlling signal, and inputting, per unit of one row of the piezoelectric elements, the row signal such that the switching element provided at the one of the pair of terminals of the piezoelectric element is switched on/off; the other of the pair of terminals of the piezoelectric element is switched to the predetermined voltage applied state; the other of the pair of terminals of the piezoelectric element is switched to the grounded state; and the other of the pair of terminals of the piezoelectric element is switched to the opened state.