Cholesteric liquid crystal screen which reflects substantially a

Details Cholesteric liquid crystal screen which reflects substantially a Cholesteric liquid crystal screen which reflects substantially a

1990-10-05

1993-03-09

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 70, 359101, 359443, 352 86, 353 84, G02F 1133, G02F 11335, G03B 2156, G03B 2132

Patent

active

051930153

ABSTRACT:
A screen for use in a front projection system includes a section capable of reflecting light of certain, predetermined wavelengths more than light of other wavelengths. The screen appears black or dark gray when viewed in broadband light. The screen provides for enhanced contrast between incident projected and ambient light. A projector for use with the screen has a light source capable of emitting the predetermined wavelengths.

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Scheffer, "Twisted Nematic Display with Cholesteric Reflector", Journal of Physics D=Applied Physics, vol. 8, 1975, pp. 1441-1448.

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