3-D IMAGE DISPLAY

摘要

The 3-D image display uses a ferroelectric liquid crystal spatial light modulator FLC SLM (12) as a varifocal lens in an imaging system. The FLC SLM is programmed to perform as a Fresnel zone plate, FZP, with a plurality of different programmable focal lengths. The FLC SLM rapidly sequences through each of the focal lengths thereby forming, one after another, images of an object at different focal lengths. As long as the sequencing is sufficiently rapid, the human eye combines the sequence images and perceives the images as a single 3-D image. Additionally, the FLC SLM is programmed to incorporate a symmetry breaking filter in its performance as FZP so that only the positive (or negative) focal length of the FZP predominates in the centre of the image. As there are no parts requiring mechanical movement to ensure the creation of images at different focal lengths, the 3-D image system is particularly suited for use in a head-mounted display.