Plasma display unit

摘要

A frame time-sharing type plasma display unit, in which a display frame for one screen is constituted by a plurality of sub-frames, and in which the luminance of the respective sub-frames is determined by a sustaining pulse number, comprises: a frame length calculation circuit (12) for calculating the length of one frame from the length of one cycle of a vertical synchronization signal; a sub-frame condition determination circuit (22) for determining from the length of one frame the number of sub-frames, the luminance of the sub-frame and a total sustaining pulse number; a load factor calculation circuit (11) for calculating a load factor, which is a ratio of a number of display cells that are illuminated to a total number of display cells, from an external input signal; a luminance factor calculation circuit (23) for determining a maximum display luminance from the consumed power and calculating a luminance factor; and a sustaining pulse number calculation circuit (24) for correcting the luminance drop due to load from the total sustaining pulse number, the luminance ratio and the load factor for the respective sub-frame and calculating sustaining pulse numbers for the respective sub-frames. The use of a luminance table is thereby avoided.