Method for driving plasma display panel and plasma display device
View Patent ↗The method for driving a plasma display panel effects control of the sub-fields in a manner that at least one sub-filed carries out, in its initializing period, an all-cell initializing operation on the discharge cells and the plurality of sub-fields other than the aforementioned sub-field selectively carry out an addressing operation in each discharge cell; at the same time, two or more predetermined sub-fields carry out an addressing operation only when at least one sub-field had an addressing operation after the all-cells initializing operation; and an unusual-charge erase period, where scan electrodes SC-SCn undergo application of voltage with a rectangular waveform, is provided after the initializing period of at least one sub-field of the predetermined sub-fields.
1. A method for driving a plasma display panel having a plurality of discharge cells with a display electrode that is formed of a pair of a scan electrode and a sustain electrode,
wherein the method effects gradation control of the plasma display panel in a manner that one field is formed of a plurality of sub-fields, each sub-field having an initializing period for generating an initializing discharge in the discharge cells, an address period for carrying out an addressing operation in the discharge cells and a sustain period for generating a sustain discharge in the discharge cells where an address discharge is generated by the addressing operation,
the initializing period of at least one of the sub-fields undergoes an all-cell initializing operation for carrying out the initializing operation on all of the discharge cells for image display;
when at least one sub-field carries out the addressing operation after the all-cell initializing operation, a subsequent plurality of predetermined sub-fields carry out the addressing operation in the respective address period, the predetermined sub-fields corresponding to a predetermined gradation level, and
at least one of the predetermined sub-fields includes an unusual-charge erase period between the initializing period and the address period, the unusual-charge erase period includes application of a voltage with a rectangular waveform including a positive voltage and a negative voltage applied to the scan electrode, wherein the negative voltage is following the positive voltage.
2. The method for driving a plasma display panel of claim 1 , wherein the unusual-charge erase period is included in a first of the predetermined sub-fields.
3. The method for driving a plasma display panel of claim 1 , wherein the unusual-charge erase period is included in a second of the predetermined sub-fields.
4. A plasma display device comprising:
a plasma display panel having a plurality of discharge cells with a display electrode formed of a pair of a scan electrode and a sustain electrode; and
a driving circuit for driving the plasma display panel, the driving circuit effecting gradation control of the plasma display panel in a manner that one field is formed of a plurality of sub-fields, each sub-field having an initializing period for generating an initializing discharge in the discharge cells, an address period for carrying out an addressing operation in the discharge cells and a sustain period for generating a sustain discharge in the discharge cells where an address discharge is generated by the addressing operation,
wherein, the driving circuit effects control of the sub-fields as follows:
carrying out an all-cell initializing operation at the initializing period of at least one of the subfields for generating the initializing operation on all of the discharge cells responsible for image display;
providing a subsequent plurality of predetermined sub-fields that undergo the addressing operation when at least one sub-field includes an addressing operation after the all-cell initializing operation, the predetermined sub-fields corresponding to a predetermined gradation level; and
applying a voltage with a rectangular waveform including a positive voltage and a negative voltage to the scan electrode between the initializing period and the address period of at least one sub-field of the predetermined sub-fields, wherein the negative voltage is following the positive voltage.