Electric lamp and discharge devices – Discharge devices having a thermionic or emissive cathode
Patent
1996-08-06
1997-08-12
O'Shea, Sandra L.
Electric lamp and discharge devices
Discharge devices having a thermionic or emissive cathode
313336, 313346R, H01J 102, H01J 116, H01J 1910, H01J 114, H01J 1906
Patent
active
056568835
ABSTRACT:
This disclosure is directed toward field emission surfaces, and is more particularly directed toward improvements in cold, low field, high current, low noise field emission devices and surfaces. Such devices are used in field emission display devices such as video displays and information displays. The device utilizes a cermet with graded concentration of insulative and conductive particles deposited on the truncated point of a conical emitter. The emission surface of the cermet is insensitive to gases that oxidize or poison the emission surface. Such gases and other contaminants emanate from a phosphor when the emission device is used in phosphor display devices. The field emission device is operated at lower potentials thereby reducing power requirements and minimizing heat dissipation requirements. Further, the field emission device which operates at lower field in order to reduce mechanically and temporally unstable emission sites which result in current bursts and current deficits at these sites. Still further, the field emission device incorporates internal resistors which provide series resistance to limit noise at affected emission areas thereby eliminating the need to limit noise by incorporating high-valued resistors, typically in series with the cathode terminal of the emission device, which reduce the potential to the entire emission surface and increasing potentials required to produce current sufficient to excite display phosphor.
REFERENCES:
patent: 4498952 (1985-02-01), Christensen
patent: 4663559 (1987-05-01), Christensen
Haynes Mack
O'Shea Sandra L.
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