Projection screen apparatus including holographic optical element
First Claim
1. A screen apparatus, comprising:
- a holographic optical element adapted to receive image light and to redirect the image light; and
a non-holographic diffuser adapted to receive the redirected image light from the holographic optical element and to scatter the redirected image light.
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Accused Products
Abstract
A screen apparatus includes a holographic optical element and a diffuser. The holographic optical element may be constructed using standard techniques known in the field of holography. The holographic optical element may be used to replace a typical Fresnel lens used in projection screen apparatuses. In operation, the holographic optical element receives image light from an image engine or projector and redirects the image light to the diffuser for scattering. The holographic optical element can be designed to substantially collimate, converge, or diverge the image light. The combination of the holographic optical element and the diffuser provides improved illumination uniformity that can be perceived by a viewer as the viewer moves in directions transverse to the screen apparatus. The screen apparatus may be designed to provide improved illumination uniformity to optimized or optimal locations in a viewing region. The screen apparatus may be advantageously employed in display apparatuses.
53 Citations
28 Claims
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1. A screen apparatus, comprising:
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a holographic optical element adapted to receive image light and to redirect the image light; and
a non-holographic diffuser adapted to receive the redirected image light from the holographic optical element and to scatter the redirected image light. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
a projection apparatus configured to produce an image to be displayed on a display surface; and
at least one reflector, wherein the image to be displayed is reflected off of the at least one reflector before passing through the holographic optical element and the diffuser.
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23. The display apparatus of claim 22, wherein the at least one reflector comprises at least two reflectors and wherein the image to be displayed is reflected off of the at least two reflectors before passing through the holographic optic element and the diffuser.
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24. The display apparatus of claim 22, further comprising:
an optical device, wherein an image to be displayed reaches the optical device twice on its way to the display surface.
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25. The display apparatus of claim 24, wherein the optical device is a reflecting polarizer.
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26. The display apparatus of claim 24, wherein the image to be displayed passes through the optical device prior to passing through the holographic optical element and the diffuser.
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27. The display apparatus of claim 24, further comprising:
a reflector, wherein at least a portion of the image to be displayed first reaches the optical device and is reflected therefrom, reaches the reflector and is reflected therefrom, and then reaches the optical device again and passes therethrough.
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28. The display apparatus of claim 27, further comprising a polarizer disposed between the reflector and the optical device.
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3. A screen apparatus, comprising:
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a holographic optical element adapted to receive image light and to redirect the image light in a non-collimated form; and
a diffuser adapted to receive the redirected image light from the holographic optical element and to scatter the redirected image light. - View Dependent Claims (4)
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Specification