The image in a plasma display panel is formed when a mixture of several rare gases are activated and discharged .and Xe is excited. Because of limitation as to the increase Xe gas, the luminous efficiency of PDP is lower than that of cathode ray tube (CRT). In this paper we show by numerical simulation that the excitation efficiency in He-Xe mixture is lower than that in a Ne-Xe mixture. Unlike the case of Ne-Xe mixture adding a small amount of Ar to He-Xe mixtures does not enhance cell excitation efficiency effectively. However employing He-Xe is useful when color purity in the plasma display panel is desired.
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