Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent
1995-02-13
1996-01-16
Gellner, Michael L.
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
359460, G03B 2160
Patent
active
054853087
ABSTRACT:
A rear-projection screen for a rear-projection image display apparatus comprises a Fresnel lens sheet, a first lenticular lens sheet, and a second lenticular lens sheet or a Fresnel lens sheet, first and second lenticular lens sheets and a light absorbing sheet. A light entrance surface of the first lenticular lens sheet or a light exit surface thereof, or both of these surfaces are formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. A thickness of the first lenticular lens sheet is selected to be the thinner than thicknesses of the Fresnel lens sheet, the second lenticular lens sheet, and the light absorbing sheet. The entrance surface and the exit surface of the second lenticular lens sheet are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material are not necessarily dispersed in the base sheet of the second lenticular lens sheet. The rear-projection image display apparatus provided with this rear-projection screen has satisfactory focusing characteristics and enhanced vertical directional characteristics and is capable of displaying an image in high brightness and high contrast.
REFERENCES:
patent: 4399455 (1983-08-01), Alvarez
patent: 4859027 (1989-08-01), Kishida
patent: 4919518 (1989-04-01), Ogino et al.
patent: 5066099 (1991-11-01), Yoshida et al.
Hirata Koji
Matuda Yutaka
Muranaka Masayuki
Osawa Atsuo
Yoshida Takahiko
Gellner Michael L.
Hitachi , Ltd.
Malley D. P.
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