Browse Prior Art Database

Gas Discharge Display

IP.com Disclosure Number: IPCOM000078316D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 3 page(s) / 45K

Publishing Venue

IBM

Related People

Brown, AV: AUTHOR [+3]

Abstract

An interactive storage gas discharge display has been devised, which eliminates the complicated x-y addressing scheme encountered in conventional gas discharge displays.

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Gas Discharge Display

An interactive storage gas discharge display has been devised, which eliminates the complicated x-y addressing scheme encountered in conventional gas discharge displays.

To avoid the oomplexity of the conventional x-y addressing schemes, an electron beam is used as an addressing tool and planar technology is relied upon to manufacture gas discharge cells having high precision dimensional tolerance. Additionally, such gas discharge cells are placed on the face of a cathode-ray tube (CRT) having control grids that feed through the face plate, for switching on individual gas cells that are addressed by an electron beam. The OFF and ON states are held in their respective conditions by a flood beam, as is done in a conventional bistable storage tube.

Fig. 1 is an illustration of an operating unit comprising a storage type CRT having the usual write gun, flood guns, but with a face plate made of two glass plates, wherein one or both of the pair will have high-density conducting feedthroughs, as much as 10/6/ electrodes per square inch. With electrodes such as A(1),A(2), K, C, etc. deposited on the two glass plates, and a suitable gas inserted between them, a gas discharge panel is formed.

In operation, anode A(1) is maintained sufficiently positive relative to cathode K to cause ionization in the gas located between these two electrodes. Electrode C can be triggered into the high potential or ON state by the writing beam of the gun, and held there by the flood beams. By using the writing beam to emit secondary electrons from electrode C, the flood beams can maintain such electrode at its low potential OFF state. In the OFF state, electrode C has a negative potential or flood-gun potential) relative to cathode K such that a strong field shields the plasma extending to anode A(2), the latter being maintained at a high potential relative to cathode K.

When control electrode C is triggered into the ON state by the writing beam (secondary electron emission 0 being greater than 1), it is charged to a potential close to the collector-mesh potential. As a consequence, the shielding field is removed and the discharge is extended to A(2), the latter being held at high voltage giving a high-brightness glow.

This device is also interactive, i.e., one can add, by properly scanning and blanking the writing beam, as in the usual storage CRT with an auxiliary cursor. To erase information, one would have to have a means to change the potential on the control electrode from high t...