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Browse Prior Art Database

Cyclic Gaseous Discharge Display Panel

IP.com Disclosure Number: IPCOM000050850D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 55K

Publishing Venue

IBM

Related People

Aboelfotoh, MO: AUTHOR

Abstract

This article describes a cyclic discharge display panel in which limitations imposed on panel size and light output by duty factor considerations are eliminated.

This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately 52% of the total text.

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Cyclic Gaseous Discharge Display Panel

This article describes a cyclic discharge display panel in which limitations imposed on panel size and light output by duty factor considerations are eliminated.

Referring to Fig. 1, display electrodes 5 and common electrodes 7 are deposited, respectively, on plate glass substrates 1 and 3. Display electrodes 5 are overcoated with a dielectric layer 11, which may be made of lead-borosilicate glass containing a high percentage of lead oxide and having a thickness of about 25 microns. Priming electrodes 9 are then formed over the dielectric glass layer
11. Common electrodes 7 and priming electrodes 9 are isolated from direct contact with the gas by layers 13 and 15. Layers 13 and 15 may be made of a mixture of an insulator having high secondary-electron emission characteristics, such as magnesium oxide, and a refractory metal having a low sputtering rate under low-energy ion-bombardmant, such as molybdenum or tungsten, and may have a thickness ranging from 100 Angstroms to 2,000 Angstroms. The concentration of the refractory metal is chosen such that the magnesium oxide/ refractory metal layer exhibits enough resistivity to prevent electrical cross talk between adjacent electrodes, yet exhibits enough conductivity to allow the priming cells to be broken down by a DC voltage. The two plate glass substrates 1 and 3 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.

The device shown in Fig. 1 operates as follows: A square-wave sustaining voltage is applied to display electrodes 5 and common electrodes 7, as shown in Fig. 2, such as to give a sustaining voltage, V(s), of approximately V(s) min. + 1/2 (V(s) max. - V(s) min.) across all display cells, where V(s) max. and V(s) min. are, respectively, the maximum and minimum sustaining voltages of the discharge. Column of priming cel...