Rear projection screen with enhanced contrast
First Claim
Patent Images
1. A projection screen assembly, comprising:
- a dispersing layer having an input side to receive light from a light source;
a first retarding layer disposed to alter polarization of the light transmitted by the dispersing layer;
a first polarizer disposed to substantially transmit light received from the first retarding layer in a first polarization state and to absorb light received from the first retarding layer in a second polarization state orthogonal to the first polarization state; and
a second retarding layer disposed to transmit the light prior to entering the input side of the dispersing layer.
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Accused Products
Abstract
Projection screen assemblies include one or more birefringent retarding layers and one or more polarizing layers. The retarding and polarizing layers reduce the unwanted reflection of ambient and image light. One embodiment of a screen assembly includes a dispersing layer having an input side to receive light from a light source and a first retarding layer disposed to alter the polarization of the light transmitted by the dispersing film. A first polarizer substantially transmits light received from the first retarding layer in a first polarization state and absorbs light received from the first retarding layer in a second polarization state orthogonal to the first polarization state.
92 Citations
44 Claims
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1. A projection screen assembly, comprising:
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a dispersing layer having an input side to receive light from a light source;
a first retarding layer disposed to alter polarization of the light transmitted by the dispersing layer;
a first polarizer disposed to substantially transmit light received from the first retarding layer in a first polarization state and to absorb light received from the first retarding layer in a second polarization state orthogonal to the first polarization state; and
a second retarding layer disposed to transmit the light prior to entering the input side of the dispersing layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A projection system comprising:
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a screen, including a light dispersing layer, a first polarizing layer;
and a first retarding layer between the light dispersing layer and the first polarizing layer; and
a second retarding layer on an input side of the light dispersing element to convert the image to a second polarization state and an image projector projecting an image having a first polarization state to the screen;
wherein the first retarding layer is oriented to convert the second polarization state to a transmission polarization state substantially parallel to a transmitted polarization direction of the polarizing layer. - View Dependent Claims (27, 28, 29, 30)
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31. A screen assembly, comprising:
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dispersing means for dispersing light from a light source;
first birefringent retarding means for retarding light received light from the dispersing means;
first polarizing means for polarizing light received from the first birefringent retarding means; and
second birefringent retarding means for retarding light transmitted to the dispersing means. - View Dependent Claims (32)
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33. A screen assembly for displaying an image having a first polarization state, comprising:
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a first polarizing layer oriented to substantially transmit light in the first polarization state;
a first retarding layer disposed to receive light from the first polarizing layer; and
a light dispersing layer disposed to receive light from the first retarding layer. - View Dependent Claims (34, 35, 36, 37, 38)
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39. An image display system, comprising
a source producing an image with light in a first polarization state; -
a first retarder disposed to change polarization of the image light to a second polarization state; and
a glare suppressor having a second retarder disposed to change polarization of the image light from the second polarization state to the first polarization state and a first linear polarizer disposed to transmit the image light in the first polarization state. - View Dependent Claims (40, 41, 42, 43, 44)
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Specification