Abstract
An electroplated cobalt-tungsten cathode on a screen-printed nickel film and mercury processes for a dc-type plasma display panel (PDP) were examined. The nickel film cathode was electroplated after a thermal process in air. Two mercury methods, a conventional mercury-capsule method and a method of dipping in mercury immediately after plating were examined. At the same applied voltage, the discharge current of the panels with electroplated cathodes was higher than the current of panels without electroplating. These results were independent of the mercury process. The electroplated cathode made with the mercury-immersion process exhibited the highest brightness. For the electroplated cathode with Hg-capsule process, a sputtered materials attached to the inside of the window glass and they decreased brightness. Therefore, the mercury immersion process was suitable for electroplated cathodes. Since the surface of the electroplated cathode was active, it reacted with the mercury uniformly. The discharge waveforms of the panels showed a sharp onset and offset. Good chromaticity and the fast response that was advantage of the PDP were maintained. Therefore, electroplating on a cathode thick film was advantageous not only for the method of preparing cathodes, but also for the method of evaluating cathode materials.
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