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:
Oct. 02, 1984
Filed:
Apr. 05, 1982
Donald Ankeny, Schaumburg, IL (US);
Gary Jones, Arlington Heights, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A system is described for synchronizing the display of characters within a character image area on a raster scanned cathode ray tube. The system's input is a composite blanking signal which includes conventional horizontal rate and vertical rate blanking pulses. In response to the composite blanking signal, the system generates a reset signal when the tube's scan reaches a reference position such as at the top of display. The reset signal and the composite blanking signal are used to develop a control signal when the composite blank signal indicates that the tube's scan has reached the character image area. Other circuitry responds to the control signal and the composite blanking signal for addressing a conventional character display circuit. The latter circuit is thus synchronized to output, to the cathode ray tube, data which is imaged within the character image area.