Patent ID: 8031134
Filing Date: 2011-10-04
Classification: G09G

Abstract:
1. A method of driving a plasma display panel, the plasma display panel including discharge cells, each discharge cell formed at an intersection of a scan electrode and a sustain electrode, and a data electrode, the method comprising: dividing one field period into a plurality of sub-fields, each sub-field having an initializing period, followed by a writing period, and followed by a sustaining period; and in the initializing periods of the plurality of sub-fields, selecting between all-cell initializing operation and selective initializing operation based on an average picture level (APL) of signals of an image to be displayed, wherein, the all-cell initializing operation causes initializing discharge in all the discharge cells for displaying an image, and the selective initializing operation selectively causes initializing discharge only in the discharge cells subjected to sustaining discharge in the preceding sub-field, wherein a sub-field in which the all-cell initializing operation is selected immediately precedes or immediately follows a sub-field in which the selective initializing operation is selected; wherein, each of the initializing periods for performing the all-cell initializing operation has a former half part, followed by a latter half part, and an abnormal charge erasing part, in the former half part, application of an ascending ramp waveform voltage with a polarity to the scan electrodes causes a first initializing discharge using the scan electrodes as anodes and the sustain electrodes and data electrodes as cathodes, in the latter half part, application of a descending ramp waveform voltage which is ranging from a voltage with the same polarity as the voltage applied during the former half part of initialization period to a voltage reverse in polarity thereto, to the scan electrodes causes a second initializing discharge using the scan electrodes as the cathodes and the sustain electrodes and data electrodes as the anodes, and in an abnormal charge erasing part which is provided after the latter half part and before the writing period, applying a positive rectangular waveform voltage to the scan electrodes for a predetermined period of time and then applying a negative rectangular waveform voltage for a shorter period than the predetermined period of time; and wherein, in the initializing periods for performing the selective initializing operation, only a descending ramp waveform voltage is applied to the scan electrodes, using the scan electrodes as cathodes and the sustain electrodes and data electrodes as anodes while the sustain electrodes are maintained at a positive voltage, wherein the sustain electrodes are maintained at zero voltage during the former half part and the abnormal charge erasing part, and the sustain electrodes are maintained at the positive voltage during the latter half part.