Patent ID: 8421714

Claim:
A plasma display device comprising: a plasma display panel having a plurality of discharge cells, each of the discharge cells including a display electrode pair formed of a scan electrode and a sustain electrode; a cumulative time calculating circuit for calculating a cumulative current-carrying time of the plasma display panel; and a driving circuit for driving the plasma display panel having a sustain-pulse generating circuit, the sustain-pulse generating circuit including: a power-recovery circuit for collecting electric power accumulated in an inter-electrode capacitor of the display electrode pair, and supplying the collected power to the display electrode pair; and a clamping circuit for clamping each display electrode pair to a power-supply voltage and a base potential, wherein, the display electrode pair is clamped to base potential, in a period between a sustain pulse for generating a last sustain discharge and an immediately preceding sustain pulse in a sustain period of each of a plurality of subfields, and a length of the period is increased when the cumulative current-carrying time calculated by the cumulative time calculating circuit exceeds a threshold, and a pulse width of the sustain pulse for generating a last sustain discharge and a pulse width of the immediately preceding sustain pulse are independent of the cumulative current-carrying time.