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. 26, 1983
Filed:
Dec. 22, 1980
Applicant:
Inventor:
Randahl B Lloyd, San Marcos, CA (US);
Assignee:
Hughes Aircraft Company, El Segundo, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340784 ; 340805 ; 340812 ; 340793 ; 340719 ; 350333 ;
Abstract
Apparatus which is utilized with a liquid crystal display for applying alternating current driving signals thereto, derived from applied direct current analog signals. The apparatus includes circuitry which samples and stores the applied analog signal. The apparatus also includes circuitry which level shifts the sampled signals so as to have voltage levels which are symmetrically disposed above and below a reference level associated with the liquid crystal display during alternating field times. The symmetrically disposed signals constitute applied alternating current signals to the display, with respect to the reference level.