Plasma display apparatus and method of driving plasma display panel

A method of driving a plasma display panel in a plasma display apparatus which includes

• a plasma display panel having a plurality of sustain electrodes and a plurality of scan electrodes,
• a driver circuit to apply sustain pulses to the plurality of sustain electrodes and the plurality of scan electrodes to generate sustain discharges, and
• a control circuit to control the driver circuit such that a total light emitting pulse count defined as a total number of sustain pulses in one display frame is set equal to a predetermined pulse count defined as a function of a display load ratio, and such that the total light emitting pulse count is set lower than the predetermined pulse count upon detecting a predetermined condition, said method comprising the steps of:
• causing the driver circuit to selectively generate first sustain pulses with timing for clamping to a predetermined voltage being first timing and second sustain pulses with timing for clamping to the predetermined voltage being second timing,
• setting a ratio between the number of the first sustain pulses and the number of the second sustain pulses to a first ratio in a case of the total light emitting pulse count being the predetermined pulse count;
• and
• setting a ratio between the number of the first sustain pulses and the number of the second sustain pulses to a second ratio different from the first ratio in a case of the total light emitting pulse count being smaller than the predetermined pulse count.