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:
Dec. 23, 1986
Filed:
Nov. 13, 1984
Karl M St John, Huntington Station, NY (US);
Hazeltine Corporation, Commack, NY (US);
Abstract
A system for the correction of nonuniformities in both color and brightness as provided for the correction of such nonuniformities in a color CRT display. The system employs correction signals which are obtained by photographing a white screen of the display at maximum brilliance. These correction signals are then added to video signals during normal operation of the display for presenting image data provided by the video signals. In the absence of any video signal, the full value of the correction signals is applied to the display. For increased amounts of video signal which cut back varying amounts of the primary colors of red, green, and blue, the correction signals are reduced in magnitude so as to provide a smaller contribution at the input video terminals of the display. Thereby, correction can be obtained over a range of varying values of intensity.