Polarization preserving front projection screen microstructures
First Claim
1. A contoured reflective microstructure, comprising:
- a substrate; and
at least one generating kernel distributed over at least one surface of the substrate, wherein the at least one generating kernel has a topographical shape operable to substantially eliminate secondary reflections of light within a predetermined incident angle range.
11 Assignments
0 Petitions
Accused Products
Abstract
Polarization preserving front projection screens and diffusers provide optimum polarization preservation for stereoscopic 3D viewing, as well as improved light control for enhanced brightness, uniformity, and contrast for both 2D and 3D systems. Generally, the disclosed screens direct light from a projector toward viewers within a diffusion locus, while maintaining optimum gain characteristics. More specifically, light incident on a region of the front projection screen from a predetermined projection direction is reflected by an engineered surface to a predetermined diffusion locus after undergoing substantially single reflections. The engineered surface, comprised of generating kernels, is used to optimally diffuse illumination light into a range of viewing angles, within the diffusion locus, with suitable gain profile, while optimally preserving polarization for 3D applications. Such a screen, when combined with matched polarization analyzing eyewear, provides extremely low cross-talk from any observation point.
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Citations
20 Claims
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1. A contoured reflective microstructure, comprising:
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a substrate; and at least one generating kernel distributed over at least one surface of the substrate, wherein the at least one generating kernel has a topographical shape operable to substantially eliminate secondary reflections of light within a predetermined incident angle range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A contoured reflective microstructure for a projection screen, comprising:
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a substrate; and at least one generating kernel disposed on a surface of the substrate, the at least one generating kernel operable to reflect polarized light to substantially all viewing locations, the polarized light being projected toward the microstructure from within a predetermined incident angle range; wherein the at least one generating kernel has a topographical shape operable to substantially eliminate secondary reflections of the polarized light incident from within the predetermined incident angle range to the viewing locations, and wherein the polarized light maintains substantially the same state of polarization before and after reflection from the microstructure. - View Dependent Claims (12, 13, 14)
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15. A contoured reflective microstructure for a projection screen, comprising:
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a substrate; and a plurality of generating kernels distributed over at least one surface of the substrate, wherein each of the plurality of generating kernels has a topographical shape operable to substantially eliminate secondary reflections of light within a predetermined incident angle range, and wherein at least two of the plurality of generating kernels are overlapping and at least one of the overlapping generating kernels is disposed to pre-correct for an offset resulting from an overlapping adjacent generating kernel. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification