Video projecting apparatus with raster distortion correction

Details Video projecting apparatus with raster distortion correction Video projecting apparatus with raster distortion correction

1978-08-25

1980-07-01

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

315370, 315371, H04N 916

Patent

active

042109299

ABSTRACT:
A video projecting apparatus for projecting a compound color image on a projection screen including a plurality of color cathode ray tubes, each of the cathode ray tubes having a phosphor screen for producing a color image, each of the color images being of a different color, a plurality of projecting lenses for projecting the color images on the projection screen with predetermined elevation and horizontal deflection angles, and a pre-distorting device for distorting a raster shape of each of the color images on the respective phosphor screen to compensate for distortion of the projected color image, in which the center of the longest horizontal scanning line of each of the color images coincides with the center of a respective horizontal line of the respective one of the phosphor screens of the color cathode ray tubes.

REFERENCES:
patent: 2989584 (1961-06-01), Mengle
patent: 3015691 (1962-01-01), Poorter

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