Patent ID: 7990341

Claim:
A plasma display device comprising: a plasma display panel including opposing first and second substrates sectioned by barrier ribs and a phosphor layer arranged between the barrier ribs, and a discharge space filled with a discharge gas; and a circuit driving an electrode group which is formed in the plasma display panel, wherein: in the first substrate, a plurality of first and second electrodes are arranged roughly in parallel alternately in a first direction, and a third electrode is arranged between the first and second electrodes, in the second substrate, a fourth electrode is arranged so as to cross the first, second, and third electrodes in a second direction, and in a sustain period, the circuit applies sustain pulses of a number corresponding to a display load ratio to the first and second electrodes, and the circuit supplies a fixed potential to the third electrode when the display load ratio is low and the number of the sustain pulses is large, or the circuit applies a narrow pulse having a width narrower than that of a sustain pulse when the display load ratio is high and the number of the sustain pulses is small.