Driving method of plasma display panel and plasma display device
View Patent ↗In a sustain operation in an ALIS PDP device, a combination in which a basic first waveform and a second waveform in which a discharge peak is separated are mixed is applied. In the combination, the probability that the second waveform occurs successively is sufficiently reduced to less than 20%, and the number of times of sustain discharges of various intensities is made equal in the lines to be driven. By this means, the 2L nonuniformity can be prevented, and the deterioration of Vsmin can be reduced.
1. A driving method of a plasma display panel, in which driving waveforms are applied to at least two types of display electrodes to perform display sustain discharges between the two types of display electrodes,
wherein a drive control in a sustain operation period in a plurality of subfields obtained by dividing one field corresponding to a predetermined display period based on time for grayscale expression is performed,
as driving waveforms for the sustain discharges between the two types of electrodes, a driving waveform by a periodic first combination in which at least two or more types of waveforms including a first-type waveform and a second-type waveform are mixed is sequentially applied to the two types of display electrodes,
the first combination is comprised of a plurality of subsidiary combinations having a shorter period than that of the first combination, and
probability that the second-type waveform is applied successively in the first combination is less than 20%.
2. The driving method of a plasma display panel according to claim 1 ,
wherein, in a structure of the first combination, the number of time of sustain discharges of various intensities by the two or more types of waveforms and total luminance thereof are made almost equal in a display line group to be driven.
3. The driving method of a plasma display panel according to claim 1 ,
wherein the plurality of subsidiary combinations are mainly formed by alternate repetition of the first-type waveform and the second-type waveform, and
in a first subsidiary combination and a second subsidiary combination of the plurality of subsidiary combinations, arrangement of the first-type waveform and the second-type waveform is revered.
4. The driving method of a plasma display panel according to claim 1 ,
wherein the first combination is comprised of the first and second subsidiary combinations,
the first subsidiary combination is formed by two or more repetitions of a pair of the first-type waveform and the subsequent second-type waveform, and
the subsidiary combination subsequent to the first subsidiary combination is formed by two or more repetitions of a pair of the second-type waveform and the subsequent first-type waveform.
5. The driving method of a plasma display panel according to claim 1 ,
wherein the first-type waveform is a waveform for generating a sustain discharge having one discharge peak, and
the second-type waveform is a waveform for generating a sustain discharge relatively weaker than the first-type waveform and having two discharged peaks.
6. The driving method of a plasma display panel according to claim 5 ,
wherein the two-types of electrodes are X electrodes for sustain driving and Y electrodes for sustain and scan driving, and
by application of the first combination, sustain discharge of the first-type waveform, relatively weak discharge of the second-type waveform in which the X electrode shows positive polarity, and relatively strong discharge of the second-type waveform in which the Y electrode shows positive polarity are generated.
7. A driving method of a plasma display panel, in which driving waveforms are applied to at least two types of display electrodes to perform display sustain discharges between the two types of display electrodes,
wherein, as driving waveforms applied to the two types of display electrodes for generating sustain discharges in a sustain operation period in a field and a subfield, a driving waveform by a periodic first combination in which at least two or more types of waveforms including a first-type waveform and a second-type waveform are mixed is sequentially applied to the two types of display electrodes,
the first combination is comprised of a plurality of subsidiary combinations having a shorter period than that of the first combination, and
second and subsequent subfields in the field start by taking over surplus of the first combination of their previous subfields.
8. A driving method of a plasma display panel, in which driving waveforms are applied to at least two types of display electrodes to perform display sustain discharges between the two types of display electrodes,
wherein, as driving waveforms applied to the two types of display electrodes for generating sustain discharges in a sustain operation period in a field and a subfield, a driving waveform by a periodic first combination in which at least two or more types of waveforms including a first-type waveform and a second-type waveform are mixed is sequentially applied to the two types of display electrodes,
the first combination is comprised of a plurality of subsidiary combinations having a shorter period than that of the first combination, and
in the first combination and repetition thereof, only in a point where the second-type waveform occurs successively, the latter second-type waveform is exchanged to the first-type waveform.
9. A plasma display device comprising: a plasma display panel in which at least two types of display electrodes are formed; and a circuit unit for driving and controlling the electrodes of the plasma display panel, in which display sustain discharges are performed between the two types of electrodes by applying driving waveforms from the circuit unit to the two types of electrodes,
wherein a drive control in a sustain operation period in a plurality of subfields obtained by dividing one field corresponding to a predetermined display period of the plasma display panel based on time for grayscale expression is performed,
as driving waveforms for the sustain discharges between the two types of electrodes, a driving waveform by a periodic first combination in which at least two or more types of waveforms including a first-type waveform and a second-type waveform are mixed is sequentially applied to the two types of display electrodes,
the first combination is comprised of a plurality of subsidiary combinations having a shorter period than that of the first combination, and
probability that the second-type waveform is applied successively in the first combination is less than 20%.
10. The plasma display device according to claim 9 ,
wherein, in a structure of the first combination, the number of times of sustain discharges of various intensities by the two or more types of waveforms and total luminance thereof are made almost equal in a display line group to be driven.
11. The plasma display device according to claim 9 ,
wherein second and subsequent subfields in the field start by taking over surplus of the first combination of their previous subfields.
12. The plasma display device according to claim 9 ,
wherein, in the first combination and repetition thereof, only in a point where the second-type waveform occurs successively, the latter second-type waveform is exchanged to the first-type waveform.