Patent ID: 6414421
Filing Date: 2002-07-02
Classification: H01J

Abstract:
A field emission cold cathode comprising:(a) an electrically conductive substrate; (b) a plurality of emitter cones formed at a surface of said substrate; (c) a gate electrode being comprised of a first resistive layer and a second resistive layer formed on said first resistive layer, said first resistive layer having a resistivity higher than a resistivity of said second resistive layer; (d) an insulating layer sandwiched between said substrate and said gate electrode, said gate electrode and said insulating layer being formed with a plurality of openings in alignment to each other, said emitter cones being formed in said openings, said emitter cones being grouped into a plurality of groups each of which includes the predetermined number of said emitter cones, said substrate being formed with trenches dividing a surface of said substrate into a plurality of regions in each of which each of said groups is located, said trenches being filled with an electrical insulator, said second resistive layer overlapping a part of said trenches so that said second resistive layer surrounds at least two of said regions when viewed in a direction of a normal line of said substrate.