High efficiency projection displays having thin film polarizing beam-splitters
First Claim
1. A projection display system comprising:
- a light source for generating an input beam of light;
a polarizing beam discriminator employing frustrated total internal reflection and thin film interference to discriminate between s and p polarized light, said discriminator separating s and p polarized light beams from said input beam;
spatial light modulator means for encoding an image onto said respective s and p polarized beams;
means for combining said encoded s and p polarized beams into an output beam, said combining means employing frustrated total internal reflection and thin film interference; and
means for focussing the output beam onto a display means.
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Accused Products
Abstract
A projection display system includes a thin film polarizing beam splitter/combiner has first and second light transmissive substrates in the form of prisms and a plurality of thin film layers disposed between the prisms. The thin film layers and have predetermined thicknesses and refractive indices which allow unpolarized incident light to be separated into s-polarized and p-polarized light beams. Both frustrated total internal reflection and thin film interference are simultaneously employed to allow s-polarized light to be transmitted and p-polarized light to be reflected over a wide range of wavelengths and angles of incidence. The device further includes two spatial light modulators for encoding an image to be projected. By providing a different signal to each spatial light modulator, a three-dimensional display results.
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Citations
27 Claims
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1. A projection display system comprising:
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a light source for generating an input beam of light; a polarizing beam discriminator employing frustrated total internal reflection and thin film interference to discriminate between s and p polarized light, said discriminator separating s and p polarized light beams from said input beam; spatial light modulator means for encoding an image onto said respective s and p polarized beams; means for combining said encoded s and p polarized beams into an output beam, said combining means employing frustrated total internal reflection and thin film interference; and means for focussing the output beam onto a display means. - 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, 26, 27)
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Specification