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:
Dec. 01, 1987
Filed:
Aug. 21, 1984
Applicant:
Inventors:
Marcel Dubois, Paris, FR;
Pierre Fagard, Montigny le Bretonneux, FR;
Assignee:
Societe Francaise d'Equipements pour la Navigation Aerienne, Velizy Villacoublay, FR;
Primary Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340784 ; 340805 ;
Abstract
A method and device for displaying symbols by means of a liquid crystal matrix. The device comprises an automation driven by a clock which feeds cyclically to the control circuit of a liquid crystal matrix the bits representative of the elementary images contained in a random access memory. The memory has a capacity greater than k (n+m) bits, k being the multiplexing coefficient and n and m being respectively the number of lines and columns of the liquid crystal matrix. The memory is refreshed by a central computer during the interval of emission of the bits.