US 2002/0159109 A1 · Projection screen apparatus including holographic optical element

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.

Claims80

Dependent claims

A display apparatus, comprising:

a holographic optical element adapted to receive image light and to redirect the image light;
and
a diffuser adapted to receive the redirected image light from the holographic optical element and to scatter the redirected image light, wherein the holographic optical element and the diffuser are disposed adjacent to one another with a gap therebetween that is substantially minimized for reducing effects of chromatic dispersion.

Dependencies are inferred from the claim text.

Projection screen apparatus including holographic optical element

Life of this patent

Projection screen apparatus including holographic optical element

Life of this patent

Abstract

Claims80