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The permanent image sticking phenomena were examined and compared for the two bias conditions of the address electrode during sustain discharge such as the grounded and positive-biased (or floated) address electrodes. To compare the permanent image sticking phenomena for both bias conditions, the differences in the display luminance, chromaticity coordinate, color temperature, infrared emission, and discharge current of the image sticking cells and the nonimage sticking cells were measured. It was observed that the positive-biased or floated address electrodes contributed to mitigating the permanent image sticking in comparison with the grounded address electrode during sustain discharge. This phenomenon appears due to the lesser degradation of the visible-conversion characteristics of the phosphor layer caused by the deposition of lower amounts of sputtered Mg species on the phosphor layers, as confirmed by Vt closed curve, atomic force microscope, and photoluminescence analyses.