a picture signal processor that performs a predetermined video signal processing for an input picture signal to produce picture signals to be displayed on a plasma display panel;

said picture signal processor is provided with a first and a second frame memory, with the second frame memory storing several frames of image data scaled by a scaler;

a plasma display panel module that displays said picture signals via an XY drive circuit that inputs said picture signals produced by said picture signal processor;

a frame shift processor that shifts, by several pixels, the image to be displayed on said plasma display panel, in one of the up, down, left, and right directions;

a state detection processor that detects the state of the image based on the picture signal to be output to said plasma display panel module;

said state detection processor is provided with a first and a second motion detector, with the second motion detector determining the difference in image data between successive frames input to said second frame memory; and

an automatic shift-time adjusting processor that changes the shift time interval for said frame according to the state of said image detected by said state detection processor.