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:
Sep. 09, 1997
Filed:
Jul. 06, 1994
Applicant:
Inventors:
Stefan Wurster, Livermore, CA (US);
Haim Shafir, Sacramento, CA (US);
Ralph Andersson, Grass Valley, CA (US);
Assignee:
Level One Communications, Inc., Sacramento, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
345 83 ;
Abstract
A pair of electrical display elements, LEDs, is driven by a three-state buffer driver circuit. The LEDs have associated current-limiting resistors. The driver circuit applies different selected voltage levels at different selected predetermined frequencies to the LEDs. By having two predetermined frequencies to a pair of LEDs, there can be exhibited at least five different display conditions from the pair of LEDs.