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:
Jun. 15, 1993
Filed:
Sep. 17, 1990
George R Gawell, Mt. Prospect, IL (US);
Philip J Nowaczyk, Chicago, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A display monitor includes a conventional cathode ray tube display together with conventional display drive circuitry. Vertical and horizontal deflection systems are operative to provide raster scanning of the cathode ray tube. High voltage apparatus produce the required CRT beam accelerating potential. A scan modulator is coupled to the horizontal deflection system and is operative to provide stable control of the amplitude of horizontal deflection signal. A modulator drive control responds to the amplitude of horizontal deflection signal and produces a control signal utilized by the modulator in maintaining stable horizontal scan amplitude. A scan selection network is coupled to the modulator drive control to selectively alter the operating point of the scan modulator and thereby produce different scan widths for normal and expanded view operation.