Patent ID: 7408532

Claim:
A plasma display device comprising: a plasma display panel; and a drive unit for driving said plasma display panel, based on a plurality of subfields which are obtained by dividing one field of a display screen into the plurality of subfields, the plurality of subfields having respective weights based on gray scale levels, wherein said plasma display panel includes: a first substrate and a second substrate disposed opposite each other, the first substrate having a first surface which faces the second substrate, and the second substrate having a first surface which faces the first substrate; a plurality of sustain electrode pairs, each said sustain electrode pair having a first sustain electrode and a second sustain electrode disposed parallel to each other with a first discharge gap therebetween on the first surface of said first substrate, to generate a sustain discharge upon application of a sustain pulse; a plurality of scan electrodes disposed parallel to said sustain electrode pairs with a second discharge gap therefrom on the first surface of said first substrate and having successively applied thereto scan pulses for conducting write discharge according to a video signal; a plurality of data electrodes provided in a pattern crossing each said sustain electrode pair on the first surface of said second substrate; a plurality of unit cells formed in each intersection region of said plurality of sustain electrode pairs and said plurality of data electrodes; a first dielectric layer covering said plurality of sustain electrode pairs and scan electrodes; and a second dielectric layer covering said plurality of data electrodes, and said drive unit is configured to conduct, for each said subfield, Address-While-Display drive in which said scan pulses are applied at the same timing as said sustain pulses; and to set a first wall voltage generated by a first wall charge formed on said first dielectric layer located on said scan electrodes higher in a negative voltage direction than a second wall voltage generated by a second wall charge formed on said first dielectric layer located on said sustain electrode pairs when said scan pulses are applied to said scan electrodes.