Patent ID: 7619592

Claim:
A driving method of a plasma display panel in which scan electrode lines and sustain electrode lines are parallel to each other and address electrode lines are spaced from and intersect the scan electrode lines and the sustain electrode lines, the method comprising: temporally dividing a unit frame into a plurality of subfields; generating a driving signal having a reset period, an address period, and a sustain period for each subfield; detecting an average signal level for the unit frame; alternately applying a first sustain pulse to the scan electrode lines and a second sustain pulse to the sustain electrode lines, wherein each of the first sustain pulse and the second sustain pulse reaches a first voltage with a rising slope and reaches a second voltage, lower than the first voltage, with a falling slope; and controlling a timing of alternately applying in accordance with the average signal level for the unit frame, wherein, when the average signal level is less than a predetermined value, controlling the timing includes having the first voltage in the first sustain pulse and in the second sustain pulse simultaneously.