Fluorescent discharge cold cathode for an image display device
AssigneeRCA Corporation
InventorJohn Guiry Endriz
Life of this patent
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Abstract
A cathodoluminescent image display device utilizes a cold cathode as the source of electrons. The cold cathode comprises a photocathode, an electron multiplier and a fluorescent anode. The structure of the cathode is such that a portion of the light given off by the fluorescent anode is free to feedback and impinge upon the photocathode. The cold cathode disclosed herein is thus a closed loop device having a loop gain G. The electron multiplier has a gain G.sub.m such that the loop gain G of the device is maintained at a value greater than or equal to one thus causing a sustained electron discharge.
Claims10
An image display device comprising an evacuated envelope within which is disposed a plurality of cathodoluminescent cells in a matrix array, each cell including:
- a. a source of electrons comprising:
- 1. An anode electrode having means for producing electromagnetic radiation in response to bombardment by electrons;
- 2.
A structure for an image display device, comprising:
- an evacuated envelope including a transparent front panel and a back panel spaced from said front panel, said front panel having a cathodoluminescent screen thereon, said back panel including a cathode electrode having means for emitting electrons in response to impinging electromagnetic radiation;
- a plurality of first vanes substantially perpendicular to and contacting said back panel, said first vanes being spaced from and parallel to each other, at least some of said first vanes including an anode electrode having means for producing electromagnetic radiation in response to bombardment by electrons, a fraction of the electromagnetic radiation produced by said anode electrode being free to feed back to and impinge upon said cathode electrode, at least some of said first vanes including dynodes for multiplying electrons;
- a plurality of second vanes, substantially perpendicular to and contacting said front panel, said second vanes being spaced from and parallel to each other and transverse to said first vanes, said first and second vanes being mutually supporting;
- and
- said first and second vanes having electroding thereon for controlling operation of said device.
Dependencies are inferred from the claim text.