Method and apparatus for cancellation of moiré interference in color cathode ray tube displays

Visible Moiré interference is eliminated by alternately shifting the phase of the horizontal sync signal or video signals such that the phase of each video line, and hence the phase of the resulting Moiré interference associated with that video line, is also alternately shifted. The phase of the Moi...

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Bibliographic Details
Main Author ABRAHAM E RINDAL
Format Patent
LanguageEnglish
Published 26.05.1995
Edition5
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:Visible Moiré interference is eliminated by alternately shifting the phase of the horizontal sync signal or video signals such that the phase of each video line, and hence the phase of the resulting Moiré interference associated with that video line, is also alternately shifted. The phase of the Moiré interferences are shifted such that persistence of vision in the human eye averages oppositely phased phosphor intensity variations occurring on alternating scan lines and/or vertical fields. When viewed by a user of the CRT, optical cancellation of the Moiré interference patterns results.
Bibliography:Application Number: HK19950000755