Image projection system

Details Image projection system Image projection system

1997-04-30

1999-03-09

Dowling, William

Optics: image projectors

Reflector

353 77, G03B 2128

Patent

active

058790675

ABSTRACT:
A projection beam supplied by a projector is incident on a beam splitter in the form of a cholesteric filter. The cholesteric filter reflects circularly polarized radiation having a wavelength which corresponds to the pitch of the molecular helix and having a direction of rotation which corresponds to the direction of the molecular helix to a reflector. The circular direction of polarization reflected by the cholesteric filter is inverted on the reflector so that the beam is subsequently passed to the screen by the cholesteric filter.

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patent: 5573324 (1996-11-01), DeVaan
patent: 5626408 (1997-05-01), Heynderickx et al.
"Polarizing Color Filters Made From Cholesteric LC Silicones" by Maurer et al, SID 90 Digest, pp. 110-113.
"Retardation Film for STN-LCDs `NRF`", Society for Information Display '92 Exhibit Guide, May 17-22, 1992, pp. 8-13.

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