Reflecting image projection screen and image projection system c

Details Reflecting image projection screen and image projection system c Reflecting image projection screen and image projection system c

1994-03-25

1996-01-23

Dowling, William C.

Optics: image projectors

Miscellaneous

353 20, 359101, 359443, G03B 2100

Patent

active

054868840

ABSTRACT:
A reflecting image projection screen (1) is described, as well as an image projection system (17) in which such a projection screen (1) is used. Viewed from the front side (3) of the projection screen (1), the image projection screen comprises, in this order, a linear polarizer (9), a .lambda./4 plate (11), a reflecting polarizer (13) in the form of a cholesteric filter and a reflecting layer (15) which is also active as a depolarizing diffuser layer. By combining a cholesteric filter (13) with a depolarizing reflecting layer (15), an image projection screen is obtained which is highly reflective to the direction of polarization supplied by the image projector (19) and substantially absorbs the other direction of polarization.

REFERENCES:
patent: 4127322 (1978-11-01), Jacobson et al.
patent: 4249801 (1981-02-01), Masubuchi
patent: 5029986 (1991-07-01), De Vaan
patent: 5193015 (1993-03-01), Shanks
Mazkedian et al., "On the Circular Dichroism and Rotary Dispersion in Cholesteric Liquid Crystals with a Pitch Gradient", Le Journal de Physique Tome 37, Jun. 1976 pp. 731-736.
PHN 14,345--Corresponds to EPA 93200055.7.
"Polarizing Color Filters made from Cholesteric LC Silicones" by R. Maurer et al, in SID International Symposium 1990, Digits of Technical Papers, pp. 110-113.
"Retardation Film for STN-LCD's 'NRF" by the firm of Nitto Denko in SID '92 Exhibit Guide, Society for Information Display, May 17-22, 1992, Boston, Mass., USA.

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