Inkjet printhead having piezoelectric actuator and method of driving the piezoelectric actuator

1. An inkjet printhead comprising:

a flow channel substrate including a pressure chamber; and

a piezoelectric actuator formed on the flow channel substrate to apply a driving force to the pressure chamber to eject ink, and including a piezoelectric layer formed on the flow channel substrate to correspond to the pressure chamber, and a plurality of common electrodes and a plurality of driving electrodes alternately arranged in a length direction of the piezoelectric layer,

wherein the plurality of common electrodes and the plurality of driving electrodes are formed on a same surface of the piezoelectric layer.

2. The inkjet printhead of claim 1 , further comprising:

an insulating layer formed between the flow channel substrate and the piezoelectric actuator.

3. A method of driving a piezoelectric actuator of an inkjet printhead including a flow channel substrate having a pressure chamber, wherein the piezoelectric actuator is formed on the flow channel substrate to apply a driving force to the pressure chamber to eject ink, the method comprising:

dividing a piezoelectric layer of the piezoelectric actuator into a plurality of sections in a length direction of the piezoelectric layer by a plurality of common electrodes and a plurality of driving electrodes alternatively disposed on a same surface of the piezoelectric layer; and

applying a driving electric field to each of the sections in the length direction through the plurality of common electrodes and the plurality of driving electrodes,

wherein the sections of the piezoelectric layer are polarized in the length direction of the piezoelectric layer.