Plasma display device and driving method thereof

A plasma display device comprising:

• a plasma display panel having a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the first electrodes and the second electrodes;
• a controller for dividing a frame into a plurality of subfields having a reset period, an address period, and a sustain period, and in an extrinsic vertical synchronization signal of a second frequency lower than a first frequency, allocating at least a part of a difference between one frame time according to the first frequency and one frame time according to the second frequency to a width of an address pulse applied to the third electrode of a discharge cell to be selected in the address period;
• a driving circuit for respectively applying a scan pulse and the address pulse to the first electrode and the third electrode of the discharge cell to be selected in the address period.