Patent ID: 6075315
Filing Date: 2000-06-13
Classification: H01J

Abstract:
In a field-emission cold cathode which comprises a substrate, as least one surface of the substrate being conductive, an insulating layer aggregation and a conductive gate layer formed on said conductive surface of substrate, and an emitter electrode disposed in a cavity formed in said insulating layer and said conductive gate layer, an improvement comprising:said insulating layer aggregation being composed of at least two piled-up insulating layers, wherein a wall surface is formed by end portions of said insulating layers and said gate layer, said wall surface forming said cavity with a section structure such that one end portion of at least one of said insulating layers other than an insulating layer closest to said gate layer is indented, andwherein an opening defined by surfaces of said wall surface formed by end portions of an insulating layer of said insulating layers closest to said gate layer has a diameter Di, and an opening defined by a surface of said wall surface formed by end portions of said gate layer has a diameter Dg, and Di and Dg have relative sizes such that -Dg/2<Dg-Di<Dg/3.