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:
Jul. 27, 1999
Filed:
Nov. 03, 1997
Hideo Makishima, Tokyo, JP;
Masaaki Takahashi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A field-emission cold cathode has a conductive cold-cathode substrate on which a plurality of conical emitters and a base insulator layer are formed. A ring-shaped gate electrode, a plate-shaped inner electrode, and a ring-shaped outer electrode are formed on the base insulator layer with the ring-shaped gate electrode disposed between the plate-shaped inner electrode and the ring-shaped outer electrode. A voltage supplying unit supplies the ring-shaped gate electrode, the plate-shaped inner electrode, and the ring-shaped outer electrode with a gate voltage, an inner electrode voltage, and an outer electrode voltage, each referenced to a substrate potential of the conductive cold-cathode substrate, wherein the gate voltage is higher than each of the inner electrode voltage and the outer electrode voltage.