Patent ID: 8659217
Filing Date: 2014-02-25
Classification: H01J,Y10S,Y10T

Abstract:
1. A field emission device comprising: a plurality of field emitters on a cathode substrate to emit electrons, the plurality of field emitters including a plurality of nanocones having an abscised tip; a gate electrode overlying the plurality of field emitters to partially control emission from the plurality of field emitters; and an anode/phosphor assembly positioned for receiving emitted electrons, wherein the plurality of nanocones are supported by and projecting from at least two regions of the cathode substrate and include an oxidized metal shell having an empty core on the entire surfaces of each nanocone, the oxidized metal shell including a refractory metal between a first metal oxide and a second metal oxide, the refractory metal including molybdenum, niobium, and tungsten.