Influence of sustaining pulse-width on electro-luminous efficiency in AC plasma display panels

The influence of sustaining pulse-width on electro-luminous efficiency has been experimentally investigated for the surface discharge of AC plasma display panels. A square driving voltage pulse with a variable duty ratio and a fixed rise time of 300 ns has been used in this experiment. It is found that the firing voltage decreases as the sustaining pulse-width increases from 2 mu s to 8 mu s under a given driving frequency, and also decreases as the frequency increases from 10 kWz to 50 kHz. The memory coefficient is found to be significantly increased from 0.16 to 0.71, as the sustaining pulse-width increases from 3 mu s to 4 mu s, beyond which it maintains a nearly constant value of approximately 0.8 for the driving frequency range from 30 kHz to 50 kHz. The optimal sustaining pulse-width is shown to be in the range of 3 mu s and 4 mu s for driving frequencies of 30 kHz and 50 kHz, based on the observations of memory coefficient, wall charge, wall voltage and luminous efficiency.