Patent ID: 8474980

Claim:
A projection autostereoscopic display, comprising: a projector, for projecting an image comprising a plurality of viewing-zone images; and a stereo screen, for receiving the image and reflecting the image back to an observing direction, wherein the stereo screen is an optical stacking layer, and counted from a side closed to the projector, the optical stacking layer comprises: a linear polarizer layer, for receiving and polarizing the image; a first microretarder layer, disposed behind the linear polarizer layer, and having a plurality of first microretarder column-shaped regions having a first phase retardation effect and a plurality of second microretarder column-shaped regions having a second phase retardation effect, wherein the first microretarder column-shaped regions and the second microretarder column-shaped regions are arranged in interlace; a second microretarder layer, disposed behind the first microretarder layer by a distance, and having a plurality of third microretarder column-shaped regions having a third phase retardation effect and a plurality of fourth microretarder column-shaped regions having a fourth phase retardation effect, wherein the third microretarder column-shaped regions and the fourth microretarder column-shaped regions are arranged in interlace; and a reflection-type polarization-reserved diffuser layer, disposed behind the second microretarder layer for reflecting and diffusing the image into various directions while maintaining a polarization state of the image.