Projection screen and projection system comprising the same

Details Projection screen and projection system comprising the same Projection screen and projection system comprising the same

2006-06-06

2006-06-06

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural reflecting areas

C359S454000, C359S487030, C359S352000, C359S465000, C349S087000, C349S096000, C349S176000

Reexamination Certificate

active

07057813

ABSTRACT:
The present invention provides a projection screen capable of sharply displaying an image even under bright environmental light, of improving brightness distribution and viewing angle, and of providing high image visibility, and a projection system including such a projection screen. The projection screen includes: a polarized-light selective reflection layer that selectively reflects a specific polarized-light component; a substrate that supports the polarized-light selective reflection layer and a circular Fresnel lens provided on the observation side of the polarized-light selective reflection layer. The circular Fresnel lens controls the optical axis of right-handed circularly polarized light projected on the projection screen so that the light enters the polarized-light selective reflection layer nearly vertically to it regardless of the point and angle at which the light is incident on this layer.

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“Bragg Reflection From Cholesteric Liquid Crystals,” W.D. St. John, et al., Physical review E, vol. 51, No. 2, Feb. 1, 1995, pp. 1191-1198.
“Optical Properties of Diffusion-Type Cholesteric Liquid Crystalline Polymer Film,” A. Shiozawa et al., Molecular and Liquid Crystals, vol. 364, 2001, pp. 464-478.

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