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Applications of Integrated Thermionic Technology to Single Beam Crts

IP.com Disclosure Number: IPCOM000040762D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Burstell, CB: AUTHOR [+3]

Abstract

High frequency (>100 MHz) modulation of cathodes in cathode ray tubes using low integrated circuit driver voltages can be achieved by using integrated thermionic chips (ITC) as the cathode. The chips can be mounted in an otherwise standard cathode assembly requiring minimum changes to existing assemblies. The integrated thermionic circuit consists of cathode and grid electrodes which are patterned and etched from a thin metal film deposited on a dielectric substrate. Oxide cathode material is deposited and photolithographically patterned on the cathode metal electrodes. Because of the close proximity of the grid to the cathode, the cutoff voltages can be very low. The adaptation of ITCs to a single beam is straightforward.

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Applications of Integrated Thermionic Technology to Single Beam Crts

High frequency (>100 MHz) modulation of cathodes in cathode ray tubes using low integrated circuit driver voltages can be achieved by using integrated thermionic chips (ITC) as the cathode. The chips can be mounted in an otherwise standard cathode assembly requiring minimum changes to existing assemblies. The integrated thermionic circuit consists of cathode and grid electrodes which are patterned and etched from a thin metal film deposited on a dielectric substrate. Oxide cathode material is deposited and photolithographically patterned on the cathode metal electrodes. Because of the close proximity of the grid to the cathode, the cutoff voltages can be very low.

The adaptation of ITCs to a single beam is straightforward. By utilizing the standard cathode's indirect heater, small changes need to be made in the manufacture of an electron gun using the ITC so that the ITC carrier can substitute for the normal cathode structure and the electrical connection to the cathode. The cathode area would be similar to that of the standard cathode and beam size defined by the aperture in G1 (grid 1), as in the standard arrangement. The ITC/G1 combination can be viewed as a triode extractor structure compared to the normal diode extractor. The amplification resulting from the grid on the ITC yields the gain which lowers the drive requirements. It is possible to drive the triode structure in a common grid or common cathode configuration depending on drive considerations. There are many variations possible with this...