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:
Feb. 28, 1984
Filed:
Jun. 21, 1982
Joseph Bujalski, Roselle, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A scanning CRT visual display system is provided in which the operation of the CRT controller which provides video blanking pulses and horizontal and vertical sync pulses for controlling the CRT display is temporarily halted when a larger than normal vertical spacing between horizontal scan lines is desired. During the time that the operation of the CRT controller is halted, which is accomplished by the selective blocking of clock timing pulses to the controller, an auxiliary synchronous counter circuit effectively counts the clock timing pulses and provides a substitute horizontal sync pulse for the CRT display such that during the implementation of a larger than normal vertical step for the scanning CRT display system, horizontal sync pulses are always provided even though the operation of the CRT controller is temporarily suspended during this time.