High contrast front projection display screen
OwnerRichard B. Lewisinventor
Life of this patent
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Abstract
Disclosed is a front projection display screen formed from a multiplicity of optical cells juxtaposed to define a surface. Each of the cells comprises a directional filter and light converging optics. The directional filter, which covers substantially all of the face of the optical cell, is adapted to pass light from the direction of the projector and to absorb light from other directions except at a small, transparent return aperture. The light converging optics are adapted to focus the substantially parallel light from the projector at the return aperture part of the directional filter and to spread it into a large solid angle. The combination provides an image of improved visual contrast by absorbing background light and returning image light to viewers.
Claims5
A projection screen (23) for displaying optical images projected onto the front thereof by a projector, comprising a multiplicity of optical cells, each of said cells (FIG. 3) comprising:
- a. means (44) for converging light from said projector at a determined focal region (47) within said cell, and
- b. directional filter means (40) covering substantially all of the face of said cell, said directional filter means comprising a transparent return aperture (46) located at said focal region and light propagation control means (45) to pass a substantial fraction of light incident from the direction of said projector and to absorb substantially all light incident from other directions.
Dependencies are inferred from the claim text.