Patent ID: 6980177

Claim:
An image altering apparatus for providing confidential viewing of a fundamental display image by a viewer, comprising: a. a display comprised of a plurality of pixels; b. means for generating a fundamental image on said display, said fundamental image having a plurality of fundamental color components corresponding to each of said pixels; c. Beans for modifying said fundamental image to generate a compound image on said display which is substantially featureless and renders said fundamental image non-viewable to the naked eye, said compound image including a plurality of compound color components corresponding to each of said pixels; d. each of said compound color components being comprised of at least one said fundamental color component of a predetermined intensity and wavelength, time multiplexed with at least one corresponding related color component of the same said wavelength; e. said plurality of compound color components corresponding to each of said pixels having a display sequence characterized in that at least one of said fundamental color components is always displayed out of time-phase with the remainder of said fundamental color components corresponding to the same said pixel; and f. Beans for extracting said fundamental image from said compound for viewing only by the viewer on said display.