Means for improving contrast or colour purity, e.g. black matrix or light shielding means

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Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs > Constructional details > Vessels, containers or parts thereof, e.g. substrates > Optical arrangements or shielding arrangements, e.g. filters or lenses > Means for improving contrast or colour purity, e.g. black matrix or light shielding means