Image tiling technique based on electrically switchable holograms

摘要

A projection system and a method displaying a high resolution composite image on a projection screen include a number of reconfigurable holographic optical elements (HOEs) in the projection optics of the system. The reconfigurable HOEs of the projection optics allow the system to direct multiple image segments of the composite image that are projected from a single image source toward different regions of the projection screen to form the composite image on the screen. The image segments have a high resolution due to the fact that they have been magnified by a relatively small degree. Consequently, the displayed composite image formed by the image segments has an equally high resolution. Each reconfigurable HOE includes a hologram that is sandwiched between two electrode layers. The hologram is a holographic photopolymeric film that has been combined with liquid crystal. The hologram has an optical property that changes in response to an applied electrical field. The reconfigurable HOEs of the projection optics operate to selectively diffract the image segments projected from an image generator to different regions of the projection screen when enabled to a diffractive state. The image segments that are diffracted by the projection optics produce the composite image on the projection screen.