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Described is a DC gaseous discharge display panel which utilizes a cermet layer over the metal cathodes of the panel, which significantly improves the stability of the operating voltage.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
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Stable Cermet Layer For DC Gas Discharge Display Panel
Described is a DC gaseous discharge display panel which utilizes a cermet
layer over the metal cathodes of the panel, which significantly improves the
stability of the operating voltage.
The cermet layer may be made of a mixture of an insulator, such as
magnesium oxide, aluminum oxide or a mixture of magnesium oxide and
aluminum oxide, and a refractory metal having a low sputtering rate, such as
molybdenum, tungsten or tantalum.
The DC gaseous discharge display panels with which this article deals may
be of the kind described in U.S. Patent 4,297,613. Such panels may be
fabricated by forming cathode and anode electrodes on plate glass substrates,
and utilizing a coating made of a mixture of an insulator, such as magnesium
oxide, and a metal, such as gold, over the metal cathodes to protect the metal
cathodes against degradation from ion bombardment and provide lower
operating voltages. The gold concentration is chosen such that the magnesium
oxide/gold layer exhibits enough conductivity to prevent the build-up of any
significant surface charge during DC operation. The two plate glass substrates
are then edge-sealed, the panel is evacuated, and a Penning gas mixture, such
as neon-argon, is introduced into the panel under a less than atmospheric
pressure during a backfill operation.
During DC operation, ion bombardment depletes the surface of the
magnesium oxide/gold layer of gold because of the relatively high...