Field emission cathode with uniform emission

Details Field emission cathode with uniform emission Field emission cathode with uniform emission

1997-09-25

1999-05-18

O'Shea, Sandra

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

313309, 313351, 3151691, H01J1/30;19/24

Patent

active

059053305

ABSTRACT:
A field emission type cold cathode includes a gate electrode (5), and insulating layer (4) disposed under the gate electrode (5), and emitter cones (7) respectively disposed in cavities penetrating through the insulating layer (4) and the gate electrode (5). The cathode includes a conductive layer (3) which is in contact with the emitter cones (7), and a second insulating layer (2) in the form of a plurality of islands and disposed between the conductive layer (3) and a substrate (1). The conductive layer (3) is electrically connected to the substrate (1) at contact regions. In a preferred embodiment, the conductive layer (3) has pocket regions (3c) for connecting the conductive layer (3) with the substrate (1). The pockets (3c) have a first conductivity, wherein the conductive layer (3) has a second conductivity in the regions that are proximate to the areas in contact with the cones (7). The second conductivity is greater than the first conductivity. The cathode of the present invention provides for uniform operation of the emitter cones (7).

REFERENCES:
patent: 3771026 (1973-11-01), Asai et al.
patent: 4074304 (1978-02-01), Shiba
patent: 5075595 (1991-12-01), Kane
patent: 5283500 (1994-02-01), Kochanski
patent: 5557160 (1996-09-01), Makishima et al.
patent: 5585689 (1996-12-01), Imura
C.A. Spindt, "A Thin-Film Field-Emission Cathode", Journal of Applied Physics, vol. 39, 1968, pp. 3504-3505 (no month).

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