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Precurved Glass Plates for Gas Discharge Display Panels

IP.com Disclosure Number: IPCOM000086574D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 18K

Publishing Venue

IBM

Related People

Fowler, AB: AUTHOR

Abstract

One difficulty in large gas discharge display panels made from flat glass plates arises because the gas is at lower than atmospheric pressure. As a result, the plates are forced together near the center and, in large panels, may even touch. In small panels, nonuniform spacing results.

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Precurved Glass Plates for Gas Discharge Display Panels

One difficulty in large gas discharge display panels made from flat glass plates arises because the gas is at lower than atmospheric pressure. As a result, the plates are forced together near the center and, in large panels, may even touch. In small panels, nonuniform spacing results.

One technique for obviating this difficulty is to preform the panel plates in a domed-like shape. The domed-like plates are first sealed together before filling, as shown in Fig. A. Thereafter, the panel is evacuated and backfilled to a partial pressure such that the spacing is uniform, as shown in Fig. B. By so doing, it can be seen that the effect of the pressure is compensated such that the plates are not pushed together near the center and are uniform in spacing. Any of a variety of techniques may be employed to form the plates with the desired curve. For example, the plates may be formed over setter plates having a predetermined curve.

Alternatively, equal spacing may also be achieved by making only one of the plates domed-shaped with a predetermined curve. After evacuating and backfilling to the appropriate partial pressure, the plates are caused to bend in conformance with the pressures and stresses, such that each plate is curved and equidistant from the other. As is evident, the spacing may readily be adjusted by varying the partial pressure and/or the curve or arc of the precurved plates.

As is further evident, the di...