Rear-projection screen and a rear projection image display emplo

Details Rear-projection screen and a rear projection image display emplo Rear-projection screen and a rear projection image display emplo

1994-11-09

1996-04-30

Braun, Fred L.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

G03B 2160

Patent

active

055130372

ABSTRACT:
A rear-projection screen for a rear-projection image display comprises a Fresnel lens sheet (2) and a lenticular lens sheet (3), or a Fresnel lens sheet (2), a lenticular lens sheet (3) and a light absorbing sheet (4). The entrance surface (21) of the Fresnel lens sheet (2) or the entrance surface (41) of the light absorbing sheet (4) is formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. The thickness of the Fresnel lens sheet (2) is approximately equal to that of the lenticular lens sheet (3). The entrance surface (31) and the exit surface (32) of the lenticular lens sheet (3) are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material, which is essential to the prior art rear-projection screen, are not necessarily dispersed in the base sheet (30) of the lenticular lens sheet (3). The rear-projection image display 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: 4054907 (1977-10-01), Itoh et al.
patent: 4432010 (1984-02-01), Oguino
patent: 4536056 (1985-08-01), Oguino
patent: 4725134 (1988-02-01), Ogino
patent: 4762393 (1988-08-01), Gerritsen et al.
patent: 4919515 (1990-04-01), Hasegawa et al.

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