Plasma display, controller and driving method thereof with simultaneous driving when maximum grayscale is higher than reference level

A driving method of a plasma display including a plurality of row electrodes, a plurality of column electrodes, and a plurality of discharge cells respectively defined by the plurality of row electrodes and the plurality of column electrodes, the driving method for driving the plasma display including dividing a field into a plurality of subfields, the driving method comprising:

• determining a maximum grayscale level of a video signal input for the field;
• comparing the maximum grayscale level of the video signal to a reference level;
• and
• driving the plasma display in accordance with the comparing, wherein,
• when the maximum grayscale level of the video signal is greater than the reference level, driving a plurality of subsequent subfields after a first subfield of the plurality of subfields includes:
• dividing the plurality of row electrodes into first and second row electrode groups, and
• sustain-discharging light emitting cells in a second subgroup of the second row electrode group while selecting non-light emitting cells from a plurality of light emitting cells in a first subgroup of the first row electrode group;
• and
• when the maximum grayscale level of the video signal is less than the reference level, driving the plurality of subfields includes, for each of the plurality of subfields:
• selecting light emitting cells from the plurality of discharge cells, and
• sustain discharging the selected light emitting cells.