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:
Nov. 09, 1993
Filed:
Jan. 31, 1992
Applicant:
Inventor:
Willard A Young, Brampton, CA;
Assignee:
Litton Systems Canada Limited, Etobicoke, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
307139 ; 307113 ; 361246 ; 345211 ;
Abstract
Presented is a device and method for providing a means of driving capacitive cells, such as those comprising suspended particle light valve windows, with a squarewave voltage signal at a select frequency with high efficiency and low power requirements. The invention uses an inductive circuit in parallel with the capacitive load of the capacitive cell, a dc voltage source, and a fast switching means connected to timely control the polarity of the voltage source to the capacitive cell.