Selective reflecting
First Claim
Patent Images
1. A projection system, comprising:
- a projector for projecting light in wavelength bands, comprising a non-laser light source;
a screen comprising at least two metallic layers separated by a layer of dielectric material constructed and arranged to reflect light in the wavelength bands and to not reflect light not in the wavelength bands.
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Accused Products
Abstract
A projection system that includes a projector that projects light in wavelength bands, including a non-laser light source and a screen that includes at least two metal layers separated by a layer of dielectric material. The screen is constructed and arranged to reflect light in the wavelength bands projected by the projector and to not reflect light not in the wavelength bands.
138 Citations
32 Claims
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1. A projection system, comprising:
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a projector for projecting light in wavelength bands, comprising a non-laser light source;
a screen comprising at least two metallic layers separated by a layer of dielectric material constructed and arranged to reflect light in the wavelength bands and to not reflect light not in the wavelength bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
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11. A projection system in accordance with 1, wherein the projector projects light in wavelength bands that are greater than 50 nm wide at full-width half-maximum.
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13. A projection system, comprising:
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a screen, comprising at least two metallic layers separated by a layer of dielectric material constructed and arranged to reflect light in the wavelength bands and to not reflect light not in the wavelength bands; and
a projector, constructed and arranged to emit light in the pre-determined wavelength bands, comprising a non-laser light source having a non-flat emission spectrum having an emission peak in a first of the wavelength bands; and
an emission spectrum modifier to modify the non-flat emission spectrum by increasing the energy in a second of the pre-determined wavelength bands relative to the energy in the first wavelength band. - View Dependent Claims (14, 15, 16, 17)
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18. A method for constructing a projection system, comprising:
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a projector having a broadband spectral emission pattern having an emission peak at a predetermined wavelength; and
a screen constructed and arranged to preferentially reflect light in a plurality of wavelength bands, one of the plurality of predetermined wavelength bands including the predetermined wavelength, the screen comprising at least two metallic layers separated by a layer of dielectric material.
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19. A projection system, comprising:
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a projector for projecting light in wavelength bands, the projector comprising a light source with a non-flat broadband emission spectrum having an emission peak at an emission peak wavelength;
a screen comprising a first metallic layer and a second metallic separated by a first layer of dielectric material, constructed and arranged to reflect light in the wavelength bands and to not reflect light not in the wavelength bands, wherein a first of the wavelength bands includes the emission peak wavelength. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A projection screen constructed and arranged so that the reflectivity of light in a plurality of predetermined wavelength bands is significantly greater than the reflectivity of light in other wavelength bands, comprising:
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a first and second layer of reflective material, separated by a layer of a dielectric material, wherein the central wavelengths of the wavelength bands of greater reflectivity are given by where values of λ
are the central wavelengths of the wavelength bands;
n is the index of refraction of the dielectric material;
D is the thickness of the layer of dielectric material in nanometers;
M is the thickness of the second reflective layer in nanometers;
C is a constant depending on the material of the first reflective layer; and
m is an integer that represents the number of the peak. - View Dependent Claims (30, 31, 32)
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Specification