Projector using guest-host liquid crystal cells for improved col

Details Projector using guest-host liquid crystal cells for improved col Projector using guest-host liquid crystal cells for improved col

1988-01-06

1989-06-13

Miller, Stanley D.

Optics: image projectors

Plural projection paths with single light source

350337, 350339F, 350349, 353 20, 353 25, 353 31, 353122, G02F 113

Patent

active

048386553

ABSTRACT:
The disclosure relates to a projector having an arrangement of polarizers and liquid crystal cells aligned on the axis of light in the order a first color polarizer colored in red, a first twisted nematic liquid crystal cell, a second twisted nematic liquid crystal cell, a second color polarizer colored in a green, a third twisted nematic liquid, a neutral polarizer and Guest-Host type colored in blue. Since, according to this, a polarizer having inferior color characteristics can be replaced by a Guest-Host type liquid crystal cell, the excitation purity and the scope of color reproduction are improved. Further, since the mixture of color is additive, the brightness of the reproduced color is also much improved.

REFERENCES:
patent: 3703329 (1972-11-01), Castellano
patent: 4241339 (1980-12-01), Ushiyama
patent: 4613207 (1986-09-01), Fergason
Vatne, R. et al., "A LC/CRT Field-Sequential Color Display," SID 83 Digest pp. 28-29 (1983).
Aruga, S. et al., "High-Resolution Full-Color Video Projector with Poly-Si TFT Array Light Valves," SID 87 Digest, pp. 75-78 (1987).
Bos, P. et al., "A Full-Color Field Sequential Color Display," Eurodisplay Research Conf. '84 Proceedings, pp. 7-9.
"Technological Development of Liquid Crystal Color Display Devices," vol. 38, No. 4 of Jour. of the Institute of Television Engineers of Japan, pp. 340-345.

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