Selective reflecting
First Claim
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1. Apparatus comprising:
- a projection screen,said projection screen having structure constructed and arranged (i) to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions, and (ii) to significantly attenuate reflection of incident optical energy in bands of optical wavelength regions outside frequency ranges contained in said predetermined number of narrow bands;
wherein said projection screen comprises a polarizing layer for transmitting light polarized in a given direction and for absorbing light not polarized in said given direction; and
wherein said structure further comprises a plurality of diffusing layers, which are separate from the polarizing layer.
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Abstract
Selective reflective optical apparatus includes a projection screen. The projection screen has structure constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions.
138 Citations
6 Claims
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1. Apparatus comprising:
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a projection screen, said projection screen having structure constructed and arranged (i) to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions, and (ii) to significantly attenuate reflection of incident optical energy in bands of optical wavelength regions outside frequency ranges contained in said predetermined number of narrow bands; wherein said projection screen comprises a polarizing layer for transmitting light polarized in a given direction and for absorbing light not polarized in said given direction; and wherein said structure further comprises a plurality of diffusing layers, which are separate from the polarizing layer. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus comprising:
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a projection screen, said projection screen having structure constructed and arranged (i) to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions, and (ii) to significantly attenuate reflection of incident optical energy in bands of optical wavelength regions outside frequency ranges contained in said predetermined number of narrow bands; wherein said projection screen comprises a polarizing layer for transmitting light polarized in a given direction and for absorbing light not polarized in said given direction; wherein said structure comprises a diffusing layer, which is separate from the polarizing layer; and said apparatus further comprising layers of dielectric material of alternating high index of refraction and low index of refraction; wherein said polarizing layer is between said diffusing layer and said layers of dielectric material.
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Specification