Projection screen

Details Projection screen Projection screen

1994-08-30

1996-04-30

Gellner, Michael L.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

359456, 359455, 359460, 353 77, G03B 2128

Patent

active

055130364

ABSTRACT:
In a projection screen for a rear projection type television set, three lens sheets are arranged in the order of a lenticular lens sheet, a linear Fresnel lens sheet, and a circular Fresnel lens sheet when seen from a viewer's side toward a projector tube. As compared with the arrangement in which the linear and circular Fresnel lens sheets are exchanged with each other, it is possible to obtain a higher brightness and a more uniform brightness, and color uniformity in the picture plane. Further, when the light incident surface of the linear Fresnel lens sheet is matted, it is possible to eliminate white bands (seen from the viewer's side) effectively.

REFERENCES:
patent: 5408282 (1985-04-01), Nagashima et al.

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