Patent ID: 8026867

Claim:
A plasma display device comprising: a Plasma Display Panel (PDP) having scan electrodes and sustain electrodes; and a first driving circuit for initializing discharge cells by applying rising waveforms and falling waveforms to the scan electrodes in a reset period; a second driving unit for applying a positive polarity waveform to the sustain electrodes and a negative polarity waveform to the scan electrodes, in a pre-reset period prior to the reset period, wherein: the first driving circuit is adapted to apply a rising waveform, which has a slope different from a slope of a rising waveform applied in a reset period of a first sub-field, in a reset period of a second sub-field disposed immediately after the first sub-field, the first subfield and the second subfield being included in a same frame, a part of the positive polarity waveform overlaps all of the negative polarity waveform, the rising waveform of the first sub-field has a first rising waveform of a first slope and a second rising waveform of a second slope, a voltage of the first rising waveform increasing in a substantially linear manner from a ground voltage to a first voltage and a voltage of the second rising waveform increasing in a substantially linear manner from the first voltage to a second voltage higher than the first voltage, the rising waveform of the second sub-field has a third rising waveform of a third slope and a fourth rising waveform of a fourth slope, a voltage of the third rising waveform increasing in a substantially linear manner from a ground voltage to a third voltage and a voltage of the fourth rising waveform increasing in a substantially linear manner from the third voltage to a fourth voltage higher than the third voltage, the third voltage is substantially equal to the first voltage, a time interval for the first rising waveform is applied is more than a time interval for the third rising waveform is applied, the first slope of the first rising waveform is greater than the second slope of the second rising waveform, and the third slope of the third rising waveform is greater than the fourth slope of the fourth rising waveform, and the third slope of the third rising waveform is greater than the first slope of the first rising waveform, and the fourth slope of the fourth rising waveform is greater than the second slope of the second rising waveform.