The discharge characteristics of PDPs with the protective layers of MgO based ternary oxides are investigated. The panels with a gas mixture of Ne-Xe20% are manufactured by "all-invacuum" process, in which the front panels are processed without an exposure to ambient air after the deposition of protective layer. Compared with PDPs with conventional MgO protective layer, a discharge voltage is lowered by 40V and a discharge time lag is shortened within 1 μs.
We developed a new PDP manufacturing method in which protective layer deposition and sealing were performed continuously in high vacuum (pressure range 10-6 Pa), to keep the protective layer surface as clean as possible (``all-in-vacuum''). Thè`a ll-in-vacuum'' panel shows high performance: 1) short aging time, 2) lowˆring voltage, and 3) short statistical time lag. Especially, the short statistical time lag is not obtained once the MgO layer is annealed in ambient air, even though the annealed MgO layer is activated in high vacuum.
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