Patent ID: 7746295
Filing Date: 2010-06-29
Classification: G09G

Abstract:
1. A plasma display device comprising: a plasma display panel including at least a plurality of discharge cells each having at least an electrode pair for generating a sustain discharge for a light emission display, wherein a sustain pulse voltage is applied between said electrode pair in a respective one of said plurality of discharge cells to generate the sustain discharge, wherein at least a first-waveform voltage and a second-waveform voltage are provided for use as said sustain pulse voltage, and said first-waveform voltage is composed of a first portion having a major portion of a first voltage and having a time duration T said second waveform voltage is composed of a third portion having a major portion of a third voltage and having a time duration T (i) at least one of the following inequalities is satisfied: said third voltage>said first voltage or T (ii) at least one of the following inequalities is satisfied: said fourth voltage>said second voltage or T wherein a pre-discharge and a main discharge continuous with the pre-discharge are generated when said first-waveform voltage having a time duration T wherein one of said first-waveform and second-waveform voltages is selected based upon a load factor, which is a ratio of a number of lighted ones of said plurality of discharge cells during said sustain discharge to a total number of said plurality of discharge cells, and wherein said plasma display device further comprises a table listing a relationship among said load factors, numbers of said sustain pulses of said first-waveform and second-waveform voltages, and luminance of said discharge cells, and at a boundary load factor at which a changeover is performed from said first-waveform voltage to said second-waveform voltage, numbers of sustain pulses of said first-waveform and second-waveform voltages are selected by using said table such that two luminances produced by discharges generated by said first-waveform and second-waveform voltages, respectively, are approximately equal to each other.