High efficiency two-SLM projector employing total-internal-reflection prism
First Claim
1. A display comprising:
- a light source for providing polarized light;
a wheel having front and back surfaces displaced from each other, said front and back surfaces each having segments of different colors for separating the polarized light into a plurality of colors having the same polarization;
at least two light valves each receiving different ones of said plurality of colors and providing an image forming light; and
a projection lens for projecting the image forming light onto a screen.
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Accused Products
Abstract
A display is disclosed operating in a field-sequential color mode having at least two light valves which are simultaneously illuminated with different color beams having the same polarization provided from a color wheel. The light valves provide an image forming light to a projection lens for projecting the image forming light onto a screen. The wheel has front and back surfaces which are displaced from each other and have segments of different colors for separating a polarized light into the simultaneous different color beams when the different colors of the front and back color segments overlap. The two beams from the front and back surfaces are parallel to each other when the front and back surfaces are parallel. Alternatively, when the front and back surfaces meet to form a wedge, the two beams have different directions. The front and back color segments are offset relative to each other and each has clear segments so that one colored beam is provided to one of the light valves. The front and back clear segments are also offset relative to each other. The wheel is rotated for sequentially illuminating the light valves with different colors simultaneously.
190 Citations
28 Claims
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1. A display comprising:
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a light source for providing polarized light; a wheel having front and back surfaces displaced from each other, said front and back surfaces each having segments of different colors for separating the polarized light into a plurality of colors having the same polarization; at least two light valves each receiving different ones of said plurality of colors and providing an image forming light; and a projection lens for projecting the image forming light onto a screen. - 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 color wheel for field-sequential color projection comprising:
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a first surface having first color segments separated by first transparent segments, said first color segments converting a white light to different colors; and a second surface having second color segments separated by second transparent segments, said second color segments converting said white light to said different colors; said first color segments being offset from said second color segments to simultaneously provide two beams of light having different colors when said first and second color segments overlap, and said first transparent segments being offset from said second transparent segments to transmit said white light. - View Dependent Claims (27, 28)
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Specification