Method for driving an AC type plasma display panel
This disclosure relates to a method for driving an AC type plasma display panel. According to this disclosure, an elapse time period between an end time point of ramp-down and a time when a first scan pulse is applied is maintained to be uniform even when a ramp-down slope is different in such a manner that a comparator of a scan electrode driving circuit compares an output voltage with a reference voltage and a logic control circuit outputs a control signal to a logic control circuit when the output voltage is equal to the reference voltage. Accordingly, the method for driving the AC type plasma display panel is capable of improving an address characteristic and a driving margin.
1. A method for driving an AC type plasma display panel having a three-electrode structure in which one frame is divided into plural subfields, each of the plural subfields is divided into a reset period, an address period, and a sustain period, and all periods of the last subfield end within a time of one frame, the method for driving the AC type plasma display panel comprising:
allowing a comparator of a scan electrode driving circuit to compare a reference voltage with an output voltage in a ramp-down discharge period of a scan electrode;
allowing the comparator to simultaneously output a control signal to both the scan electrode driving circuit and to a logic control circuit when the output voltage arrives at the reference voltage;
allowing the scan electrode driving circuit to apply a predetermined voltage Vyl to all cells in response to the control signal; and
allowing the logic control circuit to differently set an output time point of the control signal in response to the control signal, to maintain an elapse time period to be uniform even when a ramp-down slope is different between a time point when the predetermined voltage Vyl is applied to all cells and a time point when the address period starts to be uniform even when a first scan pulse is applied.
2. The method for driving the AC type plasma display panel according to claim 1 , wherein a scan voltage Vsc is used as the reference voltage.
3. The method for driving the AC type plasma display panel according to claim 1 , wherein a voltage changed from a scan voltage Vsc by V (V being a voltage less than Vsc) is used as the reference voltage.