Plasma display unit

A frame-time sharing type plasma display unit in which a display frame for one screen comprises a plurality of sub-frames, and in which the respective luminance of each sub-frame is determined by a corresponding sustaining pulse number, said plasma display unit comprising;

• a frame length calculation circuit calculating a length of one frame from a length of one cycle of a vertical synchronization signal;
• a sub-frame condition determination circuit determining a number of sub-frames SFNUM, a respective luminance ratio WSFi of each of said sub-frames and a total sustaining pulse number NSUSmax from the length of said one frame;
• a load factor calculation circuit calculating a respective load factor DLi of each of said sub-frames, which is a ratio of a number of display cells that are illuminated to a total number of display cells in the sub-frame, from an external input signal;
• a luminance factor calculation circuit determining a maximum display luminance from a consumed power and calculating a luminance factor β;
• and
• a sustaining pulse number calculation circuit correcting the luminance drops of said respective sub-frames due to a load based on said total sustaining pulse number, said respective luminance ratios, said luminanace factor and said load factors for said respective sub-frames and calculating a corrected sustaining pulse number CSPi for each of said plurality of sub-frames of each said frame.