METHOD FOR DRIVING PLASMA DISPLAY PANEL AND PLASMA DISPLAY DEVICE
The method for driving a plasma display panel effects control of the subfields as follows. The all-cell initializing operation on the discharge cell is carried out in the initializing period of at least one sub-filed; the rest of the subfields other than the aforementioned subfield selectively carry out an addressing operation in each discharge cell. Gradation display is attained by combination of a subfield having an address discharge in the address period and a sub-filed with no address discharge in the address period. In a discharge cell where an address discharge is generated in the address period of a subfield that follows the subfield having the all-cell initializing operation in the initializing period, the subfield having the all-cell initializing operation has an address period for generating an address discharge.
1 . A method for driving a plasma display panel having a plurality of discharge cells, each of the discharge cells including a display electrode pair, which is formed of a scan electrode and a sustain electrode, and a data electrode,
wherein one field is formed by a plurality of subfields, each of the subfields having:
an initializing period for generating an initializing discharge in the discharge cell;
an address period for selectively generating an address discharge in the discharge cell; and
a sustain period for generating a sustain discharge in the discharge cell where an address discharge has been generated in the address period,
wherein the one field includes an all-cell initializing subfield performing an all-cell initializing operation in which the initializing discharge is generated in all the discharge cells and a selective-cell initializing subfield performing a selective-cell initializing operation in which the initializing discharge is generated only in a discharge cell generating a sustain discharge in a previous subfield,
the method comprising:
applying a mildly increasing voltage with a ramp waveform to the scan electrodes at an end of the sustain period;
performing gradation control by arbitrarily combining
a subfield having the address period for generating the address discharge; and
a subfield having the address period for not generating the address discharge, in the selective-cell initializing subfield
providing the address period for generating the address discharge even in the address period of the subfield for performing the all-cell initializing operation
in the discharge cell where the address discharge is generated in the address period having the initializing period of any selective-cell initializing subfield that follows the subfield having the initializing period for performing the all-cell initializing operation.
2 . (canceled)
3 . A plasma display device comprising:
a plasma display panel having a plurality of discharge cells, each of the discharge cells including a display electrode pair, which is formed of a scan electrode and a sustain electrode, and a data electrode; and
a driving circuit for driving the plasma display panel,
wherein one field is formed by a plurality of subfields, each of the subfields having:
an initializing period for generating an initializing discharge in the discharge cell;
an address period for selectively generating an address discharge in the discharge cell; and
a sustain period for generating a sustain discharge in the discharge cell where an address discharge has been generated in the address period,
wherein the driving circuit performs an all-cell initializing operation for generating the initializing discharge in all the discharge cells, where images are to be displayed, in the initializing period of at least one of the subfields,
wherein a mildly increasing voltage with a ramp waveform is applied to the scan electrodes at an end of the sustain period,
wherein generation of the address discharge is controlled even in the address period of any subfield having the initializing period for performing the all-cell initializing operation in the discharge cell where the address discharge is generated in the address period of a subfield that follows the subfield having the initializing period for performing the all-cell initializing operation.