Color deviation prevention device in projection display with minimized white chromaticity deviation

摘要

A projection display of the type which projects the respective images emitted from a plurality of tubes on a rectangular screen through lenses arranged correspondingly to the projection tubes, thereby to compose the images by overlapping, wherein the lenses are arranged so that the optical axis is located on the center line substantially bisecting the angle at which the pupil of each of the lenses sees both side ends of the rectangular screen with an equal angle, and wherein there is provided an arrangement for optically or electrically correcting relative deviations in the amounts of light projected from the lenses.