Projection Display with Holographic Screen

A method for projecting an image on a holographic screen so the image is visible from a first side of the holographic screen but invisible from a second side of the holographic screen, the method comprising:

• polarizing the image from a projector with a polarizer so the image has light of substantially one polarization;
• and
• projecting the image onto the holographic screen to utilize holographic elements for:
• redirecting the image out from the first side of the holographic screen;
• and
• preventing light of said one polarization from passing so the image is not visible from the second side of the holographic screen.

A projection display system, comprising:

• a semi-permeable screen selected from the group consisting of:
• a holographic screen having holographic optical elements for redirecting an image to a first side of the semi-permeable screen and for passing light of a first polarizing direction so the image is not visible from a second side of the holographic screen;
• a perforated screen with mechanical perforations and a polarizer on the perforated screen for passing light of the first polarizing direction;
• an optical screen with one of an optical film and an optical coating, and the polarizer on the optical screen;
• and
• a magnesium screen with a magnesium film and the polarizer;
• a retarder plate optically following the holographic screen on the first side of the semi-permeable screen;
• a mirror optically following the retarder plate on the first side of the semi-permeable screen;
• and
• a projector on a second side of the semi-permeable screen, wherein:
• the projector projects an image through the semi-permeable screen, the retarder plate, and onto the mirror;
• and
• the mirror reflects the image back onto the semi-permeable screen so that the reflected image is visible from the first side of the semi-permeable screen and invisible from the second side of the semi-permeable screen.

A method for projecting an image on a semi-permeable screen so the image is visible from a first side of the screen but invisible from a second side of the screen, the method comprising:

• projecting the image through the semi-permeable screen, wherein the semi-permeable screen is selected from the group consisting of:
• a holographic screen with holographic optical elements for redirecting an image to a first side of the semi-permeable screen and passing light of a first polarizing direction so the image is not visible from a second side of the semi-permeable screen;
• a perforated screen with mechanical perforations and a polarizer on the perforated screen for passing light of the first polarizing direction;
• an optical screen with one of an optical film and an optical coating, and the polarizer on the optical screen;
• and
• a magnesium screen with a magnesium film and the polarizer on the magnesium screen;
• passing the image through a retarder plate after the semi-permeable screen, wherein the retarder plate rotates polarization of the image;
• and
• reflecting the image back onto the polarizer on the screen, wherein the image is visible on the first side of the semi-permeable screen and invisible on the second side of the semi-permeable screen.