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

2007-01-02

2007-01-02

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

C359S454000, C359S459000, C359S600000, C359S492010, C359S452000, C359S599000, C359S487030, C349S185000, C349S087000, C349S096000, C349S176000, C349S115000

Reexamination Certificate

active

10942090

ABSTRACT:
A projection screen includes a polarized-light selective reflection layer having a cholesteric liquid crystalline structure, capable of selectively diffuse-reflecting a specific polarized-light component; a substrate for supporting the polarized-light selective reflection layer; and an optical member provided on the observation side of the polarized-light selective reflection layer. The optical member diffuses imaging light which the polarized-light selective reflection layer diffuse-reflects, while maintaining the state of polarization of the imaging light. The optical member diffuses right-handed circularly polarized light that is projected on the projection screen, when the light travels from the observation side to the polarized-light selective reflection layer. The diffused light (31a1) enters the polarized-light selective reflection layer and is diffuse-reflected owing to the scattering property of the polarized-light selective reflection layer (the property of diffusing light that is selectively reflected, owing to structural non-uniformity in the cholesteric liquid crystalline structure containing a plurality of helical structure parts, the helical axes of which extend in different directions). The optical member further diffuses this diffused light (31a2) when the light travels from the polarized-light selective reflection layer toward the observation side. The thus diffused light (31a3) finally emerges toward the observation side.

REFERENCES:
patent: 5193015 (1993-03-01), Shanks
patent: 5296965 (1994-03-01), Uetsuki et al.
patent: 5486884 (1996-01-01), De Vaan
patent: 6381068 (2002-04-01), Harada et al.
patent: 6906764 (2005-06-01), Kashima et al.

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