Patent ID: 6313572
Filing Date: 2001-11-06
Classification: H01J

Abstract:
An electron emission device comprising:an auxiliary electrode layered over a substrate;a first gate electrode layered via a first insulation layer over said auxiliary electrode;an emitter electrode layered via a second insulation layer over said first gate electrode for emitting electrons when subjected to an electric field;a second gate layered via a third insulation layer over said emitter electrode;wherein a hole is formed through said first insulation layer, said first gate electrode, said second insulation layer, said emitter electrode, said third insulation layer, and said second gate electrode, so that said auxiliary electrode is exposed at a bottom of said hole;said first gate electrode is protruding further than said emitter electrode toward a center line of said hole;said first insulation layer having an opening end recessed further than an opening end of said first gate electrode;said second insulation layer and said third insulation layer having opening ends recessed further than opening ends of said emitter electrode and said second gate electrode;wherein if L1 is the film thickness of said second insulation layer and L2 is the protrusion amount of said first gate electrode, then L1 and L2 satisfy the relationship:0.5.ltoreq.L2/L1.ltoreq.2.0.