Browse Prior Art Database

Magnetic Field Display Device

IP.com Disclosure Number: IPCOM000075728D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Kazan, B: AUTHOR

Abstract

This device provides a simple and compact display which directly converts information stored in a magnetic film into a visible image.

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Magnetic Field Display Device

This device provides a simple and compact display which directly converts information stored in a magnetic film into a visible image.

As seen in A, a local glow discharge is created between two electrodes 2 and 4 by potential source 6, such discharge being created at the edge of a glass envelope 8 filled with a gas such as argon. As a result of the discharge, a plasma of positive and negative charges is produced throughout the envelope, but no light is generated. A magnetic film 10, such as permalloy, stores information. Below this film, and insulated therefrom, are sets of X and Y crossed conductors for addressing the film by current pulses sent therethrough. A layer 12 of conductive phosphor, such as ZnO, lies atop of the magnetic film.

During operation of the display, a low potential of about +10 volts is maintained on the magnetic film. If the latter is uniformly magnetized, the current density of the electrons impinging on the ZnO does not vary over the surface and the phosphor emits light uniformly. However, if individual elements of the film are magnetized in accordance with simultaneous current pulses passed through X and Y conductors, a magnetization patter of magnetic fields parallel to the surface are produced in the space above the ZnO layer. The electrons arriving at the ZnO will be locally deflected, causing a nonuniform current density at the ZnO, creating a luminescent patter corresponding to the stored magnetic patte...