Field emission cold cathode and method for manufacturing the same
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United States of America Patent
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Jul 29, 1997
Issued Date -
N/A
app pub date -
Nov 21, 1995
filing date -
Jun 8, 1993
priority date (Note) -
Expired
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Abstract
A field emission cold cathode comprises a conductive substrate, an insulating layer formed on the substrate and having plural cavities each for receiving an emitter, a gate electrode for applying a high electric field to the tips of emitters. An annular portion of the gate electrode each defining an opening overlapping corresponding cavity is located at a distance from the substrate smaller than the distance between another portion of the gate electrode and the substrate. Parasitic capacitance between the gate electrode and the cold cathode including the substrate and the emitter is reduced due to the large distance between the another portion of the gate electrode and the substrate. Between the another portion and the substrate, a second insulating layer or a gap is disposed. The field emission is cold cathode can function in a high frequency range while fabricating conical emitters with a small height due to the small distance between the annular portions and the substrate.
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