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:
Apr. 09, 1996
Filed:
Mar. 15, 1994
Applicant:
Inventors:
Gyun-gyoo Lee, Kwacheon, KR;
Sun-jeong Choi, Suwon, KR;
Assignee:
Samsung Display Devices Co., Ltd., Kyungki, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315167 ; 315162 ; 445 35 ; 445 46 ; 313364 ;
Abstract
A field emission cathode includes first and second cathode layers having respective projections and disposed on the surface of a substrate. An insulating layer having an opening and disposed on the surface of the cathode layer surrounds the projections. A field emission tip includes the projections, one of which is annular and projects beyond the other so that the field emission tip has a crater-like shape which improves the electron emission characteristic of the cathode.