Electron-emitting devices having variously constituted electron-emissive elements, including cones or pedestals
AssigneeSilicon Video Corporation
InventorsChristopher J. Spindt, John M. Macaulay
Life of this patent
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Abstract
A gated electron-emitting device contains a multiplicity of electron-emissive elements, each formed with a pedestal (98) and an overlying cone (94.sub.1). In each electron-emissive element, the base diameter of the cone is greater than the element, the base diameter of the cone is greater than the diameter of the pedestal. With the pedestal being electrically conductive, the cone may be electrically resistive. Alternatively, each electron-emissive element can be an elongated element (30B) that reaches a maximum diameter at a point between, and spaced apart from, both ends of the element.
Claims32
An electron-emitting structure comprising:
- a lower electrically conductive region;
- and
- a multiplicity of laterally separated electron-emissive elements contacting the lower conductive region, each electron-emissive element comprising (a) a highly resistive portion situated over the lower conductive region and (b) a corresponding electron-emissive portion situated over the highly resistive portion, the electron-emissive portion comprising material generally in the shape of a cone pointing away from the lower conductive region, the diameter of the cone at its base being greater than the maximum diameter of the underlying highly resistive portion.
An electron-emitting structure comprising:
- a lower electrically conductive region;
- and
- a multiplicity of elongated laterally separated electron-emissive elements having respective lower ends that contact the lower conductive region, each electron-emissive element reaching a maximum diameter at a point between, and spaced apart from, both ends of that electron-emissive element.
An electron-emitting structure comprising:
- a lower electrically conductive region;
- and
- a multiplicity of laterally separated electron-emissive elements, each comprising (a) an electrically conductive pedestal situated over the lower conductive region and (b) an electron-emissive portion situated over the pedestal, the electron-emissive portion being generally in the shape of a cone that points away from the lower conductive region, the diameter of the cone at its base being greater than the maximum diameter of the pedestal.
An electron-emitting structure comprising:
- a lower electrically conductive region which comprises (a) a highly conductive part and (b) a highly resistive part situated over the highly conductive part;
- and
- a multiplicity of laterally separated electron-emissive elements situated on the highly resistive part above the highly conductive part, each electron-emissive element comprising (a) an electrically conductive pedestal situated over the highly resistive part and (b) an electron-emissive portion situated over the pedestal, the electron-emissive portion being generally in the shape of a cone that points away from the highly resistive part, the diameter of the cone at its base being greater than the maximum diameter of the pedestal.
Dependencies are inferred from the claim text.