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US 6,147,801 AGranted
Rear projection screen with reduced speckle
AssigneePhilips Electronics North America Corporation
InventorsJill F. Goldenberg, Qiang Huang, Johannes C. Van De Ven
Life of this patent
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Abstract
A rear projection screen which includes a front lenticular surface, a diffusion region behind the lenticular surface, a non-diffusion region behind the diffusion region, and a rear phase grating surface, when used with high magnification projection systems, exhibits reduced speckle when compared to other rear projection screen without such a grating.
Claims10
A rear projection screen comprising:
- a front surface, defined by an array of mutually parallel lenticules for spreading light horizontally into an audience space, first diffusion means for diffusing light into the audience space, second diffusion means located behind the first diffusion means, and a non-diffusing region between the first and second diffusion means, wherein the thickness of the non-diffusing region is 1 to 5 mm.
Dependencies are inferred from the claim text.