Patent ID: 6057642
Filing Date: 2000-05-02
Classification: H01J

Abstract:
A field emission device comprising:a substrate with a first main surface and a second main surface;an insulating layer formed on said first main surface of said substrate;a first conductive layer (a) selectively formed on said insulating layer, and (b) having a plurality of windows formed therein;said insulating layer having a like plurality of holes located just below said respective widows of said first conductive layer to expose portions of the first main surface of said substrate;said first conductive layer having a first part serving as a gate electrode and a second part serving as an interconnection for said gate electrode;said first conductive layer having an asymmetric plan shape with respect to said first part;a plurality of cathodes formed on portions said exposed first main surface of said subtstrate and extending into respective holes of said insulating layer;each said cathode having a conical shape having a central axis running between a bottom and tip thereof, the bottom of which is connected to said first main surface of said substrate and the tip of which is directed toward said gate electrode; anda second conductive layer formed on the second main surface of said substrate;wherein the central axis of each said cathode (a) is tilted at an angle with respect to a normal of said second main surface of said substrate toward an opposite side to said second part of said first conductive layer, and (b) runs parallel to the other axes;wherein electrons emitted from the tops of each said cathode travel through said windows of said first conductive layer on application of a voltage across said first conductive layer and said substrate; andwherein the direction of said emitted electrons is approximately parallel to said normal of said second main surface of said substrate.