Apparatus for reducing moire interference in color cathode ray t

Details Apparatus for reducing moire interference in color cathode ray t Apparatus for reducing moire interference in color cathode ray t

1996-03-14

1998-07-07

Lee, Michael H.

Television

Video display

Cathode-ray tube

348607, 348806, 315370, 3153821, H04N 521

Patent

active

057776989

ABSTRACT:
An apparatus for reducing Moire interference in a color cathode ray tube produced due to inconsistent spacing of scanning lines with respect to the dot pitches of a shadow mask during the display of video signals. The apparatus includes a sync signal dividing section for dividing by 2 horizontal and vertical sync signals separated from an input video signal, a vertical position control signal output section for outputting to a vertical position control section a voltage signal which varies according to a scanning Moire control signal selectively inputted by a user, and a horizontal position control signal output section for outputting to a horizontal oscillation control section a voltage signal which varies according to a video Moire control signal selectively inputted by the user, so that the vertical position of the even or odd scanning lines as well as the horizontal position of the even or odd image dots are adjusted to suppress the Moire interference.

REFERENCES:
patent: 5430502 (1995-07-01), Yamazaki et al.
patent: 5440353 (1995-08-01), Yamazaki et al.
patent: 5473223 (1995-12-01), Murakami
Moire Cancelation Circuit; Japio Abstract Accession No. 05015279 & JP 070307879 A (Hitachi) 21.22.95.
Method for Suppressing Moire Fringe Displayed on Color Cathode-Ray Tube; Japio Abstract Accession No. 03495994 & JP 030158894 A (Hitachi) Jul. 8, 1991.
Method and Device for Canceling Moire; Japio Abstract Accession No. 04469277 & JP 060113177 A (Sony) Apr. 22, 1994.

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