Patent ID: 7230759
Filing Date: 2007-06-12
Classification: G02B

Abstract:
1. An autostereoscopic projection screen simultaneously providing parallax images for left and right eyes of viewers, a right projector installed with a first polarizer, left projector installed with a second polarizer allowing polarization states of the parallax images from the left projector and the right projector, the polarization states of the parallax images being perpendicular to each other, and the distance between the autostereoscopic projection screen and the projector being adjustable by the users, the autostereoscopic projection screen comprising: a first microretarder, which allows the parallax images to pass through and contains a plurality of first phase delay zones and a plurality of second phase delay zones disposed in an interlacing way, wherein the phase difference between the first phase delay zone and the second phase delay zone is 180 degrees; a polarization-reserved diffuser, which is installed on a first surface of the first microretarder for the parallax images to pass through and maintain their polarizations; a third polarizer, which allows specifically polarized images to pass through the first phase delay zones and the second phase delay zones, wherein the third polarizer is installed either at a side of the first microretarder closer to a parallax element or at a side of the parallax element closer to the viewer for specifically polarized images to pass through; and the parallax element, which has a specific distance from the first microretarder to separate the parallax images for the left and right eyes so that the left-eye parallax image and the right-eye parallax image enter a left-eye zone and a right-eye zone of the viewer, respectively.