Plasma display device and plasma display panel driving method

A plasma display device comprising:

• a plasma display panel,
• the plasma display panel being driven by a subfield method in which a plurality of subfields is set in one field, each of the subfields has an initializing period, an address period, and a sustain period, a luminance weight is set for each of the subfields, and sustain pulses corresponding in number to the luminance weight are generated in the sustain period for gradation display,
• the plasma display panel having a plurality of discharge cells, the discharge cells having display electrode pairs, each of the display electrode pairs being formed of a scan electrode and a sustain electrode;
• and
• an image signal processing circuit for converting an input image signal into image data showing light emission and no light emission in the discharge cells in each subfield,
• the image signal processing circuit including:
• the number of lit cells calculator for calculating the number of discharge cells to be lit in each display electrode pair, in each subfield;
• a load value calculator for calculating a load value of each of the discharge cells, according to the calculation result in the number of lit cells calculator;
• a correction gain calculator for calculating a correction gain of each of the discharge cells, according to a position of the discharge cell and the calculation result in the load value calculator such that the correction gain is smaller in a central portion than in a peripheral portion on an image display surface of the plasma display panel;
• and
• a corrector for subtracting a multiplication result of output from the correction gain calculator and the input image signal, from the input image signal.