Plasma display device and plasma display panel driving method

A plasma display apparatus comprising:

• a plasma display panel having a plurality of discharge cells where a plurality of subfields having a luminance weight is disposed in one field and as many sustain pulses as a number corresponding to the luminance weight are applied in a sustain period of each of the subfields to emit light;
• an image signal processing circuit for converting an input image signal into image data representing light emission and no light emission in each discharge cell in each subfield;
• a sustain pulse generation circuit for generating the sustain pulses corresponding in number to the luminance weight and applying the sustain pulses to the discharge cells in the sustain period;
• an all-cell light-emitting rate detection circuit for detecting a rate of the number of discharge cells to be lit with respect to the number of all discharge cells on an image display surface of the plasma display panel, as an all-cell light-emitting rate in each subfield;
• a partial light-emitting rate detection circuit for dividing the image display surface of the plasma display panel into a plurality of regions and detecting a rate of the number of discharge cells to be lit with respect to the number of discharge cells in each of the regions, as a partial light-emitting rate in each subfield;
• and
• a timing generation circuit that generates timing signals for controlling the sustain pulse generation circuit, and includes a number-of-sustain-pulses corrector for controlling the number of sustain pulses to be generated in the sustain pulse generation circuit,
• wherein the number-of-sustain-pulses corrector includes a lookup table that has stored a plurality of correction coefficients correlated with the all-cell light-emitting rates and the partial light-emitting rates,
• in each subfield, the number-of-sustain-pulses corrector adjusts a first correction coefficient that is read out from the lookup table in response to the all-cell light-emitting rate and the partial light-emitting rate and is set for each subfield, and a recorrection coefficient that is set based on the first correction coefficient, by using an adjustment gain having been preset for each subfield in response to a magnitude of the luminance weight, and
• the number-of-sustain-pulses corrector corrects the number of sustain pulses set for each subfield based on the input image signal and the luminance weight, by using the first correction coefficient and the recorrection coefficient that have been adjusted with the adjustment gain.