Color moirés in contact-type three-dimensional displays

Color moires induced at contact-type multiview three-dimensional and light-field imaging are reviewed, slanted color moires are introduced, and the reason why they become invisible as the slanting angle increases is explained. The color moires in the imaging are induced by the structural uniqueness of the imaging, i.e., viewing zone-forming optics (VZFO) on the display panel. The moires behave differently from those by the beating effect. They are (1) basically chirped, (2) their fringe numbers and phases are also varying according to the changes in viewer’s viewing positions and viewing angles at a given viewing distance, (3) the pattern period of the VZFO is at least more than several times that of the pixel pattern, and (4) they are colored. The color moires can hardly be eliminated because they are induced structurally, but they can be minimized by either reducing the regularity of the pixel pattern using a diffuser between the panel and the VZFO or aligning VZFO’s pattern to have a certain slanting angle with the pixel pattern in the panel.