Two dimensional moire reduction type projection display

Details Two dimensional moire reduction type projection display Two dimensional moire reduction type projection display

1993-07-29

1994-11-15

Wintercorn, Richard A.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

359460, G03B 2160

Patent

active

053653696

ABSTRACT:
A screen is constituted by one sheet of Fresnel lens and two sheets of lenticular lenses, and the following relationships are fulfilled: 0.9 To<vy.multidot.dy
and 0.9 To<vx.multidot.dy<3 To where vx and vy denote respectively angles, which are obtained when viewing a projection lens from the side of the lenticular lenses through the Fresnel sheet, dx and dy denote respectively distances between a surface of the Fresnel lens and focal planes of the lenticular lenses, n denotes a refractive index of a medium, and To denotes a pitch of the Fresnel lens, whereby radial two dimensional moire disturbance appearing in a rear projection display can be reduced to one-fifth the amplitude of the prior art one.

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patent: 4432010 (1984-02-01), Oguino
patent: 4531812 (1985-07-01), Oguino
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patent: 5066099 (1991-11-01), Yoshida et al.
patent: 5076661 (1991-12-01), Bradley
patent: 5206761 (1993-04-01), Ogino
patent: 5289311 (1994-02-01), McClelland et al.
patent: 5296922 (1994-03-01), Mitani et al.

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