Display apparatus and display driving method for enhancing grayscale display capable of low luminance portion without increasing driving time
View Patent ↗A display apparatus driving method for a field time division type display apparatus displays grayscale by combining a plurality of subfields into which one field has been divided. Each subfield includes a resetting, an addressing, and a sustaining. At least one extra subfield is additionally provided which does not have a resetting, and which stays always ON with a luminance level higher than a prescribed input luminance level.
1. A driving method for a plasma display apparatus having address electrodes, scan electrodes and common electrodes forming display cells and display one field of image by using a plurality of subfields, the driving method comprising:
applying a reset pulse to adjust charges in the cells in a reset period;
applying an address pulse to an address electrode and a scan pulse to a scan electrode in a cell to be lit during a sustain period in accordance with display data to generate an address discharge in an address period;
applying sustain pulses to the scan electrodes and the common electrodes, alternately, to generate a sustain discharge in sustain period,
wherein the address pulse is always applied to the address electrode in at least one specific subfield of the plurality of subfields for turning ON the specific subfield when the display data does not show a black image, the specific subfield has a least luminance weight among the plurality of subfields, the specific subfield does not have the reset period, and the subfield subsequent to the specific subfield having the reset period; and
wherein a plurality of the specific subfields are provided, and the plurality of the specific subfields are arranged as a first subfield and a second subfield.
2. A plasma display apparatus comprising:
a display panel having address electrodes, scan electrodes and common electrodes forming display cells;
a driver driving said display panel;
and a control circuit receiving an image signal and converting said image signal into image data suitable for displaying on said display panel,
wherein said control circuit controls said driver to drive said display panel by using a plurality of subfields for displaying one field of image, to apply a reset pulse to adjust charges in the cells, to apply an address pulse to the address electrode and a scan pulse to the scan electrode in a cell to be lit in accordance with the image data to generate an address discharge, and to apply sustain pulses to the scan electrodes and common electrodes to generate a sustain discharge,
wherein the address pulse is always applied to the address electrode in at least one specific subfield of the plurality of subfields for turning ON the specific subfield when the image signal has luminance level higher than “0”, the specific has a least luminance weight among the plurality of subfields, the reset pulse is not applied in the specific subfield and the reset pulse is applied in the subfield subsequent to the specific subfield, and
wherein a plurality of the specific subfields are provided and arranged as a first subfield and a second subfield.