Patent ID: 8179341

Claim:
A plasma display device comprising: a plasma display panel in which a plurality of discharge cells having data electrodes are aligned; a data electrode drive circuit for driving the data electrodes; and an image signal processing circuit for processing an image signal and supplying image data for each subfield to the data electrode drive circuit; the image signal processing circuit including: an image data replacement circuit for replacing image data for a predetermined subfield with image data having less power consumption in the data electrode drive circuit; a power calculating circuit for calculating power consumption in the data electrode drive circuit and outputting power consumption in each field as field power; a power predicting circuit for storing calculated power consumption in the data electrode drive circuit corresponding to a subfield, predicting field power when the number of the predetermined subfields is increased or decreased based on the stored calculated power consumption and the field power, and outputting the field power obtained through prediction as predicted field power; and an SF determination circuit for determining the number of predetermined subfields based on the field power and the predicted field power; wherein the SF determination circuit: increases the number of predetermined subfields when the field power is not less than a predetermined power threshold; and decreases the number of predetermined subfields when the field power is less than the predetermined power threshold and also the predicted field power is less than the predetermined power threshold.