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Hermetic Sealing a Gas Discharge Panel

IP.com Disclosure Number: IPCOM000081354D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 3 page(s) / 45K

Publishing Venue

IBM

Related People

Chaikin, A: AUTHOR [+4]

Abstract

In the fabrication of a gaseous discharge display panel, conductor arrays 3 are formed on the glass plates or substrates 5 and a layer of dielectric 7 formed over the arrays, by spraying and reflowing glass frit. To protect the surface of the dielectric 7 against ion bombardment during operation of the panel, the surface of the dielectric exposed to the gas is protected with an overcoat of a refractory material 9.

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Hermetic Sealing a Gas Discharge Panel

In the fabrication of a gaseous discharge display panel, conductor arrays 3 are formed on the glass plates or substrates 5 and a layer of dielectric 7 formed over the arrays, by spraying and reflowing glass frit. To protect the surface of the dielectric 7 against ion bombardment during operation of the panel, the surface of the dielectric exposed to the gas is protected with an overcoat of a refractory material 9.

By utilizing a refractory material 9 having a high coefficient of secondary emission, the operating voltage on the display system can be reduced. When the dielectric surface has been appropriately treated, the two plates are positioned so that the conductor arrays 3 are substantially orthogonal, and the panel is sealed about its edges during an oven sealing cycle to provide a gaseous envelope.

One material having both refractory and secondary emission characteristics is magnesium oxide. When the two plates with associated conductor arrays 3, dielectric 7 and refractory coating 9 are positioned and placed in the oven for hermetic sealing, the magnesium oxide overcoat has a tendency to develop cracks or crazes at the sealing temperature which modify the electrical operating characteristics of the panel, and expose the dielectric surface at the crazed areas to degradation by ion bombardment.

In conventional gas panel fabrication, the seal glass flows to provide the desired hermetic seal. These dual requirements tend to conflict in sealing techniques in that to avoid crazing of the MgO film, a refractory dielectric is desired; to provide a hermetic seal, a high degree of interaction between the seal glass and the dielectric provided by a more fluid but less refractory dielectric is required. While one requirement can be...