Optics: image projectors – Cabinet encloses projector and one side of screen – Reflector between lamp and screen
Patent
1994-05-25
1996-11-12
Dowling, William C.
Optics: image projectors
Cabinet encloses projector and one side of screen
Reflector between lamp and screen
353 98, G03B 2128
Patent
active
055733247
ABSTRACT:
A compact and efficient image projection system is described. The 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.
REFERENCES:
patent: 4127322 (1978-11-01), Jacobson et al.
patent: 4969732 (1990-11-01), Wright et al.
patent: 5193015 (1993-03-01), Shanks
patent: 5280178 (1994-01-01), Engelen et al.
patent: 5309265 (1994-05-01), Buchecker et al.
patent: 5335022 (1994-08-01), Braun et al.
"Polarizing Color Filters Made From Cholesteric LC Silicones", by R. Maurer et al, SID International Symposium 1990, Digest of Technical Papers, pp. 110-113.
"Retardation Film of STN-LCDs `NRF`" by the firm of Nitto Denko in SID '92 Exhibit Guide, Society for Information Display, May 17-22, 1992, Boston, MA, USA.
Dowling William C.
Schmitt Michael E.
U.S. Philips Corporation
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