Plasma display panel drive method of determining a subfield, having a low luminance, for performing an every-cell initialization operation and setting a width of a sustain pulse of the subfield for performing the every-cell initialization operation
View Patent ↗A plurality of subfields of a field period includes a subfield for performing an every-cell initialization causing an initial discharge in every discharge cell in an initialization period, and includes a subfield for performing a selective initialization causing the initial discharge in a predetermined discharge cell in the initialization period. In a low-luminance subfield, the every-cell initialization is performed, and a low-luminance subfield is subsequently located (in the field period) to the subfield for the every-cell initialization. In a sustain period of the subfield for performing the every-cell initialization or a sustain period of the low-luminance subfield, a width of a first sustain pulse is set wider than a width of a second sustain pulse, and the width of the second sustain pulse is set wider than the width of a third sustain pulse and subsequent others.
1. A method of driving a plasma display panel including a plurality of discharge cells for image display,
wherein a field period includes a plurality of subfields, each subfield of the plurality of subfields including an initialization period, a writing period, and a sustain period,
wherein the plurality of subfields of the field period includes (i) a subfield for performing an every-cell initialization operation, the every-cell initialization operation causing, in the initialization period of the subfield for performing the every-cell operation, an initial discharge in each of the plurality of discharge cells, and (ii) a subfield for performing a selective initialization operation, the selective initialization operation causing, in the initialization period of the subfield for performing the selective initialization operation, the initial discharge in any predetermined discharge cell of the plurality of discharge cells,
wherein the method of driving the plasma display panel includes:
performing the every-cell initialization operation in a subfield, of the plurality of subfields, of a low luminance in comparison with other subfields of the plurality of subfields, such that the field period includes, subsequent to the subfield in which the every-cell initialization operation is performed, another subfield of the low luminance;
determining a subfield group, which includes at least one subfield of the plurality of subfields that is (i) for performing the every-cell initialization operation, and (ii) of the low luminance;
in a sustain period of each subfield of the at least one subfield of the subfield group, setting a width of a first sustain pulse to be wider than a width of a second sustain pulse, and setting the width of the second sustain pulse to be wider than a width of a third sustain pulse and subsequent other sustain pulses; and
setting a width of each first sustain pulse of each of the plurality of subfields that is subsequent to the subfield group to a same predetermined value, such that the predetermined value represents a width that is smaller than the width of the first sustain pulse of each subfield of the at least one subfield of the subfield group, and
wherein, in the every-cell initialization operation, the initial discharge is performed using a ramp voltage or a wave form having a change degree of 0.1 V/μs to 10 V/μs.
2. The plasma display panel driving method of claim 1 , further comprising, in the sustain period of the subfield for performing the every-cell initialization operation, setting the width of the first sustain pulse to be wider than the width of the second sustain pulse, and setting the width of the second sustain pulse to be wider than the width of the third sustain pulse and subsequent other sustain pulses.
3. The plasma display panel driving method of claim 2 ,
wherein, the field period includes, subsequent to the subfield for performing the every-cell initialization operation, a plurality of subfields of the low luminance, and
wherein the plasma display panel driving method includes, in the sustain period of one of the plurality of subfields of the low luminance, setting the width of the first sustain pulse to be wider than the width of the second sustain pulse, and setting the width of the second sustain pulse to be wider than the width of the third sustain pulse and subsequent other sustain pulses.
4. The plasma display panel driving method of claim 1 , wherein the width of the first sustain pulse is 10 μs or wider, and the width of the second sustain pulse is at least 2 μs and narrower than 10 μs.
5. The plasma display panel driving method of claim 2 , wherein the width of the first sustain pulse is 10 μs or wider, and the width of the second sustain pulse is at least 2 μs and narrower than 10 μs.
6. The plasma display panel driving method of claim 3 , wherein the width of the first sustain pulse is 10 μs or wider, and the width of the second sustain pulse is a least 2 μs and narrower than 10 μs.
7. The plasma display panel driving method of claim 1 , wherein
a device temperature is detected for a plasma display device that is configured by housing the plasma display panel in a cabinet, and based on the device temperature, the width of the first sustain pulse and the width of the second sustain pulse are changed.
8. The plasma display panel driving method of claim 2 , wherein
a device temperature is detected for a plasma display device that is configured by housing the plasma display panel in a cabinet, and based on the device temperature, the width of the first sustain pulse and the width of the second sustain pulse are changed.
9. The plasma display panel driving method of claim 3 , wherein
a device temperature is detected for a plasma display device that is configured by housing the plasma display panel in a cabinet, and based on the device temperature, the width of the first sustain pulse and the width of the second sustain pulse are changed.
10. The plasma display panel driving method of claim 1 ,
wherein a number of subfields are included in the subfield group determined by the determining, such that the number of subfields is half or less of a number of subfields of the plurality of subfields in the field period.