Field emission device with increased current of emitted...

Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube

Reexamination Certificate

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Details

C313S296000, C313S308000

Reexamination Certificate

active

07741768

ABSTRACT:
A field emission device (5) includes cathode electrodes (51), emitters (52) formed on the cathode electrodes, grid electrodes (54) formed over the cathode electrodes at a distance apart from the emitters, and isolated films (55) formed on surfaces of the grid electrodes neighboring the emitters. Preferably, the isolated film has a thickness ranging from 0.1 to 1 microns. The isolated film may be a film made of one or more insulating materials, such as SiO2and Si3N4. Alternatively, the one or more insulating materials can be selected from a material having a high secondary electron emission coefficient, such as MgO, Al2O3and ZnO. Additionally, the isolated film can be further formed on a second surface of the grid electrode distal from the emitter.

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