Patent ID: 7710356
Filing Date: 2010-05-04
Classification: G09G

Abstract:
1. A plasma display device for displaying an image, in a plasma display panel having a scanning electrode, a sustain electrode and a data electrode and provided with a plurality of discharge cells, by dividing one field period into a plurality of subfields each having an initialization period, a writing period and a sustain period and by performing or not performing a discharge in the plurality of discharge cells in the sustain period based on a video signal, the plasma display device comprising: a sustain pulse voltage applying section for applying, to the scan electrode and the sustain electrode, a sustain pulse voltage for allowing the discharge in the plurality of discharge cells; a lighting rate calculation section for calculating, from the video signal in advance for each subfield of the plurality of subfields, a lighting rate showing a rate of discharge in the plurality of discharge cells in the sustain period; a power supply section for supplying the sustain pulse voltage applying section with electric power; and a control section for controlling the power supply section based on the calculated lighting rate so that the sustain pulse voltage becomes constant, wherein the control section obtains a first current control signal based on the calculated lighting rate and inputs the obtained first current control signal into the power supply section for keeping an output voltage of the power supply section constant by controlling an output current of the power supply section based on the obtained first current control signal, and wherein the control section further comprises a feedback control section for obtaining a second current control signal based on the output voltage of the power supply section and for inputting the obtained second current signal into the power supply section, and the control section keeps the output voltage of the power supply section constant by controlling the output current of the power supply section based on the first current control signal and the second current control signal.