Polarized Projection Display
First Claim
Patent Images
1. An automobile comprising:
- a projection display system, comprising;
a first polarizer having a first polarization direction;
a transparent screen;
second polarizer on the transparent screen, the second polarizer having a second polarization direction different from the first polarization direction; and
a projector for projecting an image through the first polarizer and onto the second polarizer, wherein the image is visible from a first side of the transparent screen to a rear passenger and invisible from a second side of the transparent screen to a driver so the driver can look through the transparent screen and out of a rear windshield of the automobile.
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Abstract
A projection display system includes (1) a first polarizer, (2) a transparent screen, (3) a second polarizer on the transparent screen, and (4) a projector for projecting an image through the first polarizer and onto the transparent screen. The first and the second polarizers have different polarization directions so that the image is visible from a first side of the transparent screen and invisible from a second side of the transparent screen.
27 Citations
22 Claims
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1. An automobile comprising:
a projection display system, comprising;
a first polarizer having a first polarization direction;
a transparent screen;
second polarizer on the transparent screen, the second polarizer having a second polarization direction different from the first polarization direction; and
a projector for projecting an image through the first polarizer and onto the second polarizer, wherein the image is visible from a first side of the transparent screen to a rear passenger and invisible from a second side of the transparent screen to a driver so the driver can look through the transparent screen and out of a rear windshield of the automobile. - View Dependent Claims (3, 4, 5)
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2. (canceled)
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6. A method for projecting an image on a transparent screen in an automobile so the image is visible from a first side of the transparent screen to a rear passenger but invisible from a second side of the transparent screen to a driver so the driver can look through the transparent screen and out of a rear windshield of the automobile, the method comprising:
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locating the transparent screen in a line of sight of the driver to the rear windshield of the automobile; and
projecting the image (1) through a first polarizer and (2) onto a second polarizer on the transparent screen, wherein the first polarizer has a first polarization direction and the second polarizer has a second polarization direction different from the first polarization direction. - View Dependent Claims (8, 9, 10)
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7. (canceled)
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11-20. -20. (canceled)
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21. An automobile, comprising:
a display system, comprising a transparent screen having an image that is visible from a first side of the transparent screen to a rear passenger and invisible from a second side of the transparent screen to a driver so the driver can look through the transparent screen and out of a rear windshield of the automobile.
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22. A method for providing display in an automobile, comprising:
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providing an image on a first side of a transparent screen in the automobile;
preventing the image from appearing on a second side of the transparent screen, wherein the image is visible from the first side of the transparent screen to a rear passenger but invisible from the second side of the transparent screen to a driver so the driver can look through the transparent screen and out of a rear windshield of the automobile.
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Specification