Method of driving plasma display panel and plasma display unit
View Patent ↗A method drives a panel and a plasma display unit, wherein one field includes a plurality of subfields, each having an addressing period for producing an address discharge selectively in the discharge cells, and a sustaining period for producing a sustain discharge by applying a number of sustaining pulses corresponding to a weight of brightness in a discharge cell where the address discharge has been produced. Additionally, a sustaining pulse generator circuit includes a power recovery section for controlling the rising or the falling of the sustaining pulse by producing resonance between an inter-electrode capacitance of a display electrode pair and an inductor, and a clamping section for clamping a voltage of the sustaining pulse at a predetermined potential, wherein the power recovery section is used to set twice a time of the rising of the sustaining pulse to be equal to or longer than a duration of the sustaining pulse.
1. A method of driving a plasma display panel provided with a plurality of discharge cells, each discharge cell having a display electrode pair formed of a scan electrode and a sustain electrode, one field of the plasma display comprising a plurality of subfields with each subfield having an addressing period for producing an address discharge selectively in any of the discharge cells, and a sustaining period for producing a sustain discharge by applying a number of sustaining pulses corresponding to a weight of brightness in the discharge cell where the address discharge has been produced, the method comprising the steps of:
driving a rise or a fall of sustaining pulses by producing a resonance between an inter-electrode capacitance of a display electrode pair and an inductor;
clamping a voltage of the sustaining pulses at a predetermined potential;
setting a time of the sustaining pulses so that twice a time of driving the rise of the sustaining pulses becomes equal to or longer than a duration of the sustaining pulses; and
setting a resonance cycle of the inter-electrode capacitance of the display electrode pair and the inductor to be twice or longer than the time of driving the rise of the sustaining pulses.
2. The method of driving a plasma display panel of claim 1 further comprising the step of:
setting an overlapping period for overlapping the time of driving a rise of a sustaining pulse applied to one of the display electrode pairs with a time of driving a fall of another sustaining pulse applied to another of the display electrode pairs.
3. The method of driving a plasma display panel of claim 2 , wherein the overlapping period is in the range of 200 nsec to 500 nsec.
4. A plasma display unit comprising:
a plasma display panel provided with a plurality of discharge cells, each discharge cell having a display electrode pair formed of a scan electrode and a sustain electrode; and
a sustaining pulse generator circuit for applying a sustaining pulse to each of the display electrode pairs to generate a sustain discharge, the sustaining pulse generator circuit comprising:
a power recovery section for controlling a rising or a falling of a sustaining pulse by producing a resonance between an inter-electrode capacitance of a display electrode pair and an inductor; and
a clamping section for clamping a voltage of the sustaining pulse at a predetermined potential, wherein
the power recovery section regulates the sustaining pulse so that twice a time of the rising of the sustaining pulse becomes equal to or longer than a duration of the sustaining pulses, and sets a resonance cycle of the inter-electrode capacitance of the display electrode pair and the inductor to be twice or longer than the time of the rising of the sustaining pulse.
5. The plasma display unit of claim 4 , wherein the sustaining pulse generator circuit causes a time of driving a rise of a sustaining pulse applied to one of the display electrode pairs to overlap with a time of driving a fall of another sustaining pulse applied to another of the display electrode pairs.
6. The plasma display unit of claim 4 , wherein one inductor for driving a rise of a sustaining pulse, and another inductor for driving to a fall of a sustaining pulse are independently provided.
7. The method of driving a plasma display panel of claim 1 , further comprising:
controlling an overlapping period according to an average brightness level (APL).
8. The method of driving a plasma display panel of claim 1 , further comprising:
increasing an overlapping period when an average brightness level (APL) is low, and decreasing the overlapping period when the APL is high.
9. The plasma display unit of claim 4 , wherein the sustaining pulse generator circuit controls an overlapping period according to an average brightness level (APL).
10. The plasma display unit of claim 4 , wherein the sustaining pulse generator circuit increases an overlapping period when an average brightness level (APL) is low, and decreases the overlapping period when the APL is high.