Amorphic diamond film flat field emission cathode
First Claim
Patent Images
1. A method of operating a cathode, comprising the steps of:
- causing an electrical current to flow through a layer of conducting material; and
directing said current through a layer of low work-function material deposited over said conductive material, said low effective work-function material having a relatively flat emission surface comprising a plurality of distributed localized electron emission sites, wherein said emission surface is greater than 20,106.19 square nanometers in area.
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Abstract
A field emission cathode for use in flat panel displays is disclosed comprising a layer of conductive material and a layer of amorphic diamond film, functioning as a low effective work-function material, deposited over the conductive material to form emission sites. The emission sites each contain at least two sub-regions having differing electron affinities. Use of the cathode to form a computer screen is also disclosed along with the use of the cathode to form a fluorescent light source.
256 Citations
16 Claims
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1. A method of operating a cathode, comprising the steps of:
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causing an electrical current to flow through a layer of conducting material; and directing said current through a layer of low work-function material deposited over said conductive material, said low effective work-function material having a relatively flat emission surface comprising a plurality of distributed localized electron emission sites, wherein said emission surface is greater than 20,106.19 square nanometers in area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of operating a cathode, comprising the steps of:
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causing an electrical current to flow through a layer of conductive material; and directing said current through a layer of low work function material deposited over said conductive material, said low effective work function material having an emission surface comprising a plurality of distributed localized electron emission sites, wherein some of said low effective work function material is amorphic diamond.
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16. A method of operating a cathode, comprising the steps of:
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causing an electrical current to flow through a layer of conductive material; and directing said current through a layer of low work-function material deposited over said conductive material, said low effective work-function material having an emission surface comprising a plurality of distributed localized electron emission sites, wherein some of said low effective work-function material is amorphic diamond and said amorphic diamond is comprised of SP2 and SP3 crystallites.
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Specification