The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2000
Filed:
Jun. 15, 1998
Hisashi Takemura, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A field-emission cold cathode includes a substrate having a sharply pointed emitter disposed on a surface thereof and serving as an emitter electrode, an insulating film disposed on the substrate, and a gate electrode disposed on the insulating film and having an opening defined therein and having an edge surrounding the emitter. The gate electrode and the emitter are spaced from each other across a cavity near the emitter. The insulating film and the substrate have a boundary surface therebetween which is lower than the surface of the substrate. The substrate has a step positioned between the boundary surface and the surface of the substrate on which the emitter is disposed, the step being disposed between the insulating film and the emitter. The insulating film supports the gate electrode and has a thickness greater than the distance between the emitter and the gate electrode.