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

2007-04-17

2007-04-17

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural reflecting areas

C359S449000, C359S487030, C359S492010, C359S452000, C349S087000, C349S096000, C349S176000, C349S185000

Reexamination Certificate

active

10954351

ABSTRACT:
A projection screen for displaying an image by reflecting imaging light projected from a projector, including a substrate and a projected-image-receiving layer formed on the substrate. The projected-image-receiving layer has the function of selectively reflecting a specific polarized-light component and the function of diffusing the specific polarized-light component. Further, the projected-image-receiving layer includes two or more selective reflection layers having different reflection wave ranges, and, of these selective reflection layers, the selective reflection layer having a reflection wave range covering the shorter wavelength side is situated apart from the observation side as compared with the selective reflection layer having a reflection wave range covering the longer wavelength side.

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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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