Projection autostereoscopic display and stereo screen

A stereo screen, for receiving an image and reflecting the image back to an observing direction, the stereo screen comprising an optical stacking layer, and the optical stacking layer comprising:

• a first microretarder layer, receiving the image having a linear polarization state, 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.

A projection autostereoscopic display, comprising:

• a linear polarizer layer, located at an observing position;
• a projector, for projecting an image having a linear polarization state, wherein the image comprises a plurality of viewing-zone images;
• and
• a stereo screen, for receiving the image and reflecting the image to the linear polarizer layer, wherein the stereo screen comprises an optical stacking layer, and counted from a side closed to the projector, the optical stacking layer comprises:
• a first microretarder layer, for receiving the image having the linear polarization state, wherein the first microretarder layer has 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, wherein the second microretarder layer has 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 the polarization state of the image.