In an ac-PDP, it is necessary to shorten statistical time lag, t_s, and formative time lag, t_f of gas discharge because several micro second long pulses are used to control on/off switch of discharge cells. The time lags arc evaluated for a parallel plane ac discharge cell with He-Xe gas mixture. The results were in agreement with the feature of the Wijsman model, which could determine t_<sm>^<-1>(t_σ), i.e. priming intensity at a time, t_σ, elapsed from the primary discharge. The priming effect, of which t_<sm>^<-1>(tσ) decreases with increasing t_σ, is probably caused by metastable state Xe destruction of fast exponential decay, and by ion-electron recombination. Discharge characteristics caluculated with the priming effect, were compared with those of ac-PDPs.
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