Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent
1997-08-18
2000-11-14
Gray, David M.
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
359452, 359455, G03B 2160
Patent
active
061478016
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.
REFERENCES:
patent: 4184746 (1980-01-01), Coale
patent: 5005945 (1991-04-01), Van De Ven
patent: 5064273 (1991-11-01), Lee
patent: 5066099 (1991-11-01), Yoshida et al.
patent: 5206761 (1993-04-01), Ogino
Goldenberg Jill F.
Huang Qiang
van de Ven Johannes C.
Faller F. Brice
Gray David M.
Mahoney Christopher E.
Philips Electronics North America Corp.
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