Plasma display device and plasma display panel drive method

A plasma display device comprising:

• a plasma display panel having at a front substrate side:
• pluralities of scan electrodes and sustain electrodes extending in a first direction;
• a first dielectric layer covering the scan and sustain electrodes;
• and a protective layer covering the first dielectric layer, and having at a rear substrate side:
• a plurality of address electrodes extending in a second direction intersecting the first direction;
• a second dielectric layer covering the address electrodes;
• barrier ribs at both sides of the address electrode;
• and a phosphor between the barrier ribs, wherein the front substrate side and the rear substrate side are combined, so that cells are configured in a matrix corresponding to intersections of the scan electrodes and sustain electrodes and the address electrodes;
• driving circuits which apply a voltage waveform for driving to the respective pluralities of scan electrodes, sustain electrodes, and address electrodes;
• and
• a control circuit which controls the voltage waveform, wherein:
• in drive control of a display area of the display panel, there are provided:
• a reset period for generating a discharge for forming and adjusting charges to the cell;
• an address period for performing a discharge for selecting a target On cell;
• and a sustain period for performing a discharge for display by applying a sustain pulse at the selected cell,
• a first voltage waveform having a rising slope and a second voltage waveform having a falling slope are applied to the electrodes of the plasma display panel in the reset period,
• a slope of one of the first voltage waveform and the second voltage waveform from a start of application of the one voltage waveform to a first predetermined timing is a first slope, and a slope of the one voltage waveform from the first predetermined timing to an end of application of the one voltage waveform is a second slope, and
• the second slope is steeper while an accumulated operation time from a start of using the plasma display panel of the plasma display device is from zero to a first time than after the first time.