Selective reflecting
First Claim
1. An optical device, comprising:
- a projection screen, comprisinga first broadband reflective layer;
a second broadband reflective layer;
substantially continuous layers of dielectric material, each layer consisting essentially of a material having a different index of refraction (n) than the material of an adjacent layer, the layers disposed between the first reflective layer and the second reflective layer, constructed and arranged so that an optical output of the optical device includes substantially more light with wavelengths in a plurality of narrow wavelength bands than light with wavelengths not in the plurality of wavelength bands.
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Accused Products
Abstract
A projection screen that includes a multilayer, multiband, single stack device that selectively reflects light with wavelengths in plurality of narrow wavelength bands, and methods for making the screen. The multilayer, multiband, single stack device may be an etalon device. The multiple layers may be deposited on a diffusing substrate. The projection screen may also include a polarizer that coacts with a projector. The projector polarizes the projected light in the narrow wavelength bands into the same polarity and the screen reflects the light with the same polarization and does not reflect light of another polarization. The polarizer may include substrate with a thin polarizing coating. The screen may include a matte surfaced diffuser.
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Citations
15 Claims
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1. An optical device, comprising:
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a projection screen, comprising a first broadband reflective layer; a second broadband reflective layer; substantially continuous layers of dielectric material, each layer consisting essentially of a material having a different index of refraction (n) than the material of an adjacent layer, the layers disposed between the first reflective layer and the second reflective layer, constructed and arranged so that an optical output of the optical device includes substantially more light with wavelengths in a plurality of narrow wavelength bands than light with wavelengths not in the plurality of wavelength bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising
at a projection screen receiving projected light and ambient light, processing the light, and preferentially reflecting portions of the light that are within at least two narrow spectral bands relative to reflection of light that is not within the narrow spectral bands, the processing occurring within consecutive layers of higher and lower index-of-refraction materials wherein the processing the light comprises reflecting the light, by a first and second broadband reflective layer constructed and arranged so that the consecutive layers of higher and lower index of refraction materials are between the first and the second reflective layer, so that light with wavelengths not in the plurality of narrow bands of wavelengths destructively interferes.
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13. An optical device, comprising:
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a projection screen, comprising a first reflective layer and a second reflective layer for reflecting light toward each other through substantially continuous layers of dielectric material, each layer consisting essentially of a material having a different index of refraction (n) than the material of an adjacent layer, so that light of at least one wavelength band destructively interferes in a space between the first reflective layer and the second reflective layer, so that incident light of said at least one wavelength band is attenuated by the device.
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14. An optical device comprising:
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a projection screen comprising a first reflective layer and a second reflective layer for reflecting light toward each other through substantially continuous layers of dielectric material, each layer consisting essentially of a material having a different index of refraction (n) than the material of an adjacent layer, so that light of at least one wavelength band destructively interferes in a space between the first reflective layer and the second reflective layer, so that incident light of said at least one wavelength band is attenuated by the device, wherein the first reflective layer and the second reflective layer reflect light of all wavelength bands in the visible spectrum.
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15. An optical device, comprising:
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a projection screen, comprising a first reflective layer and a second reflective layer, for reflecting light of substantially all wavelengths in the visible spectrum; and substantially continuous layers of dielectric material, each layer consisting essentially of a material having a different index of refraction (n) than the material of an adjacent layer, the layers disposed between the first reflective layer and the second reflective layer, constructed and arranged so that an optical output of the optical device includes substantially less light with wavelengths in at least one wavelength bands than an optical input to the optical device.
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Specification