(under subclass 745) Subject matter wherein a raster scan pattern of at least one projection device is modified to cancel out a distortion due to an angular placement of the tube in relation to the optical projection axis or due to the use of non-planar optical elements.
(1) Note. Raster scanning is scanning by means of a line-by-line sweep across the entire display surface to generate a complete display image.
(2) Note. Example of distortions are keystoning which refers to a trapezoidal distortion and pincushion distortion which emulates a square having curved sides.
