Method and apparatus for cancellation of Moire interference in c

Details Method and apparatus for cancellation of Moire interference in c Method and apparatus for cancellation of Moire interference in c

1991-01-18

1992-04-21

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358150, G09G 104, H01J 2956, H04N 506

Patent

active

051071886

ABSTRACT:
Visible Moire 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 Moire interference associated with that video line, is also alternately shifted. The phase of the Moire 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 Moire interference patterns results.

REFERENCES:
patent: 4887010 (1989-12-01), Fujimura

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