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Gaseous Discharge Display Panel with Electroluminescent Output

IP.com Disclosure Number: IPCOM000079978D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 45K

Publishing Venue

IBM

Related People

Hall, JJ: AUTHOR [+2]

Abstract

In a conventional gas discharge display panel, the visible light output of an active display element is produced by the recombination of electrons and ions in the gas during the discharge. The color of the emitted light is characteristic of the gas or mixture of gases contained in the panel, and the efficiency of conversion of electrical input power to visible light output power is approximately 1/10 of one percent. An alternative method of light generation from the AC gas discharge display panel is suggested which permits not only higher power conversion efficiency, but also a wide range of choices for the color of the emitted light. The suggested structure preferentially permits the emission of light of different color from different discharge sites in a display panel with a single-gas envelope.

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Gaseous Discharge Display Panel with Electroluminescent Output

In a conventional gas discharge display panel, the visible light output of an active display element is produced by the recombination of electrons and ions in the gas during the discharge. The color of the emitted light is characteristic of the gas or mixture of gases contained in the panel, and the efficiency of conversion of electrical input power to visible light output power is approximately 1/10 of one percent. An alternative method of light generation from the AC gas discharge display panel is suggested which permits not only higher power conversion efficiency, but also a wide range of choices for the color of the emitted light. The suggested structure preferentially permits the emission of light of different color from different discharge sites in a display panel with a single-gas envelope.

Illustrated is a schematic cross section of a single cell of a conventional gas discharge display panel. The gaseous medium, which typically may be neon gas with minor additions of other gases, is contained within a dielectric envelope, usually of glass, on the outside of which are disposed electrical conductors. In operation, the surface of the dielectric layer serves as a charge-storage medium, alternately being charged and discharged by charged particles from the gas discharge produced in response to the externally applied voltage. For a typical panel cell, the voltage appearing across the dielectric layer, between its surface and the underlying electrode, varies approximately +/-100 V during each cycle when the cell is in the lit state, whereas it varies less than +/-5 V when the cell is in the off state. A typical operating frequency for a gas discharge display panel is approximately 30 kHz.

The use of an electroluminescent phosphor material as the dielectric layer, or as part of the dielectric layer, shown in the figure, is suggested. The magnitude and the frequency of the voltage appearing across such an electroluminescent dielectric layer for a cell in the lit state is sufficient to produce relatively efficient light output, approximately 1% or more, from the dielectric region contained be...