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:
May. 28, 1996
Filed:
Nov. 05, 1993
Anthony V Gioiosa, Justice, IL (US);
Display Technologies Inc., Carthage, MO (US);
Abstract
In monitor circuitry, a simple circuit separates out the horizontal synchronization pulses from the composite synchronization signal and removes undesired horizontal synchronization pulses during the vertical blanking period. By using a pulse-width modulated signal having the same frequency as the horizontal rate but not necessarily with the same phase, and having at least a 50% duty cycle, the undesired pulses are gated out before being coupled to the horizontal synchronization circuit of the monitor, thus, the monitor system will not attempt to lock at a double frequency, nor cause visible distortion of the raster. The effect of the pulse width modulated signal is inhibited when a user changes the horizontal synchronization frequency and until the monitor achieves lock on the new frequency.