Patent ID: 7501998

Claim:
A plasma display device comprising: a plasma display panel including a first electrode and a second electrode forming a discharge cell; a driver for dividing a frame into a plurality of subfields having respective weights, driving the plurality of subfields, and alternately applying sustain discharge pulses to the first and second electrodes in a sustain period, wherein the subfields are divided into at least two groups; and a first voltage of a first sustain discharge pulse of a first subfield of the subfields belonging to a first group of the at least two groups, the first group including at least the subfield having the lowest weight in the sustain period, wherein the first voltage is less than a second voltage of a second sustain discharge pulse of a second subfield belonging to a second group of the at least two groups in the sustain period, wherein the first electrode comprises a first bus electrode and a first discharge electrode formed in the discharge cell and coupled to the first bus electrode, the second electrode comprises a second bus electrode and a second discharge electrode formed in the discharge cell and coupled to the second bus electrode, and a first region at which a discharge is spread at the first and second discharge electrodes by the first sustain discharge pulse of the first voltage is narrower than a second region at which a discharge is spread at the first and second discharge electrodes by the second sustain discharge pulse of the second voltage; and wherein the first discharge electrode includes a third region formed within the discharge cell and a fourth region for coupling the third region and the first bus electrode, the second discharge electrode includes a fifth region formed within the discharge cell and a sixth region for coupling the fifth region and the second bus electrode, and the second region includes at least part of the fourth and sixth regions.