Rear-projection screen

Details Rear-projection screen Rear-projection screen

1994-05-31

1995-07-11

Wintercorn, Richard A.

Optical: systems and elements

Projection screen

Rear projection screen

G03B 2160

Patent

active

054326362

ABSTRACT:
In a rear-projection screen comprising a Fresnel lens and a light-diffusing member such as a lenticular lens sheet, a rise angle in a central region of the Fresnel lens is smaller than a rise angle in an intermediate region thereof (e.g., the former is not larger than 3.degree. and the latter is larger than 3.degree. ). The rise angles may preferably gradually increase from the central region of the Fresnel lens toward the intermediate region thereof. The central region of the Fresnel lens may preferably be a region extending within the range of from 1/4 to 1/3 from the middle point of a diagonal of the rear-projection screen. Such a Fresnel lens is effective for improving white uniformity in the intermediate region of the rear-projection screen and eliminating color corn in the central region thereof.

REFERENCES:
patent: 4053208 (1977-10-01), Kato et al.
patent: 4083626 (1978-04-01), Miyahara et al.
patent: 5146365 (1992-09-01), Minoura et al.

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