Patent ID: 7965259
Filing Date: 2011-06-21
Classification: G09G

Abstract:
1. A plasma display device for displaying an image on a plasma display panel in accordance with an input video signal, said plasma display panel having a plurality of row electrode pairs, and a plurality of column electrodes intersecting with said plurality of row electrode pairs, so as to form display cells at the intersections, respectively, and a display period for one field of the input video signal being configured of a plurality of subfields each formed of an address period and a sustain period for the image display, said plasma display device comprising: an addressing portion which selectively generates address discharge in each of said display cells in accordance with pixel data based on the video signal in the address period; and a sustaining portion which applies a sustain pulse having a leading period between row electrodes forming each of said row electrode pairs by a number of times previously determined for each of the plurality of subfields, in said sustain period; wherein said sustaining portion has a first transition portion which resonantly transits a potential on one of the row electrodes from a first potential to a second potential, a first clamping portion which clamps the potential on the one row electrode to the second potential, a second transition portion which resonantly transits the potential on the one row electrode from the second potential to the first potential, and a second clamping portion which clamps the potential on the one row electrode at the first potential, wherein the sustain pulse is generated by sequentially executing a first step for transiting from the first potential to the second potential, a second step for clamping to the second potential, a third step for transiting from the second potential to the first potential, and a fourth step for clamping to the first potential, and wherein the leading period of the sustain pulse is a period between a first time point at which the first step is started and a second time point at which the second step is started, and a length of the leading period is shortened as an accumulated light emission time or an accumulated use time of the plasma display panel increases.