Fluorescent display arrangement having field electrode adjacent

Details Fluorescent display arrangement having field electrode adjacent Fluorescent display arrangement having field electrode adjacent

1983-08-04

1986-11-18

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340761, 340781, 313410, 313513, G09G 312

Patent

active

046238824

ABSTRACT:
A display arrangement utilizes a fluorescent screen 3 to provide readily alterable bright displays. The arrangement can provide a fairly large display surface, but can be of very small thickness. It contains electron emissive cathodes 5, and field electrodes 7 positioned closely adjacent to the cathode to control the emission of free electrons. Electrons which are freely emitted are accelerated to a mesh electrode 4 which is held at a modest positive voltage. A fluorescent screen 3 having a positive potential of several thousand volts is positioned closely in front of the mesh electrode. In preferred embodiments of the invention, a number of separate cathodes and/or separate field electrodes are provided, so that selected regions of the screen can be illuminated to provide desired display patterns. Individual regions of the screen can be switched on and off (i.e. rendered bright or dark) by the application of very low switching potentials to the field electrodes and/or the cathodes.

REFERENCES:
patent: 3673448 (1972-06-01), Nakamura
patent: 3958150 (1976-05-01), Kobayakana et al.
patent: 4004186 (1977-01-01), Bylander
patent: 4070599 (1978-01-01), Uchikoba et al.
patent: 4227117 (1980-10-01), Watanabe et al.
patent: 4243986 (1981-01-01), Nixon
patent: 4280125 (1981-07-01), Kazan
patent: 4306178 (1981-12-01), Nixon

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