Image display device with optical feedback to cathode

Details Image display device with optical feedback to cathode Image display device with optical feedback to cathode

1977-02-10

1979-02-27

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Secondary emissive electrode

313105R, H01J 3148, H01J 4300

Patent

active

041421230

ABSTRACT:
An image display device includes at least one display cell having the following in spaced relation: a photocathode; multiplier dynodes, an anode electrode; and a cathodoluminescent screen. In addition to an optical feedback fluorescent material, the anode electrode includes a material which exhibits slow fluorescence, e.g., Y.sub.2 O.sub.3 :Gd3%, such that it emits light energy for a finite time period after it has been excited by electrons. In the operation of the display device, an electrical discharge is employed to produce the desired optical output at the cathodoluminescent screen. Some of the electrons created in the discharge strike the anode electrode, causing light energy to be directed to the photocathode where it is converted into free electrons. The presence of these free electrons ensures the rapid initiation of subsequent electrical discharges. In other embodiments, the electrical discharge may be obtained through ion feedback or plasma discharge.

REFERENCES:
patent: 2231691 (1941-02-01), Snyder
patent: 2727183 (1955-12-01), Marshall
patent: 3767968 (1973-10-01), Ogle
patent: 3825922 (1974-07-01), Ralph
patent: 3904923 (1975-09-01), Schwartz
patent: 4001619 (1977-01-01), Endriz et al.
patent: 4001620 (1977-01-01), Endriz
patent: 4029984 (1977-06-01), Endriz
patent: 4034255 (1977-07-01), Catanese et al.

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