Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1998-12-18
2000-06-20
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349117, 349113, 25229901, G02F 11335, C09K 1952
Patent
active
060783745
ABSTRACT:
This invention provides achromatic compound retarders, achromatic polarization switches, and achromatic shutters using the liquid crystal compound retarders. It further provides achromatic variable retardance smectic liquid crystal retarders. The achromatic compound retarder of this invention comprises a central liquid crystal retarder unit and two outer retarders positioned in series with and on either side of the liquid crystal retarder unit. The liquid crystal retarder unit comprises either (1) a rotatable smectic liquid crystal half-wave retarder or (2) first and second liquid crystal variable retarders having retardance switchable between zero and half-wave. The outer retarders have substantially the same retardance and orientation. Design equations determine the retardance of the outer retarders and their orientation relative to the central retarder to obtain a particular achromatic retardance for the compound structure.
REFERENCES:
patent: 4711530 (1987-12-01), Nakanowatari et al.
patent: 4770500 (1988-09-01), Kalmanash et al.
patent: 4884876 (1989-12-01), Lipton et al.
patent: 4967268 (1990-10-01), Lipton et al.
patent: 5020882 (1991-06-01), Makow
patent: 5033825 (1991-07-01), Ishikawa et al.
patent: 5117302 (1992-05-01), Lipton et al.
patent: 5122890 (1992-06-01), Makow
patent: 5126864 (1992-06-01), Akiyama et al.
patent: 5132826 (1992-07-01), Johnson et al.
patent: 5187603 (1993-02-01), Bos
patent: 5231521 (1993-07-01), Johnson et al.
patent: 5237438 (1993-08-01), Miyashita et al.
patent: 5243455 (1993-09-01), Johnson et al.
patent: 5247378 (1993-09-01), Miller
patent: 5347378 (1994-09-01), Handschy et al.
patent: 5784139 (1998-07-01), Chigrinov et al.
patent: 5818548 (1998-10-01), Funfschilling et al.
"Achromatic phase-shifters: 2. A quantized ferroelectric liquid-crystal system", P. Hariharan et al., 2319 Optics Communications 117 (1995) May 15, Nos. 1/2, Amsterdam, NL, pp. 13-15.
"Achromatic retardation plates", Alan M. Title et al., SIPE vol. 307 Polarizers and Applications (1981), pp. 120-125.
Pancharatnam, S., "Achromatic Combinations of Birefringent Plates, Part II. An Achromatic Quarter-Wave Plate," Indian Academy Science Proceed. (1955) 41:137-144.
Koester, Charles J., "Achromatic Combinations of Half-Wave Plates," J. Opt. Soc. Of America (Apr. 1959) 49(4):405-409.
"Improvement of Birefringent Filters. 2:Achromatic Waveplates", Alan M. Title, Jan. 1975/ vol. 14, No. 1/ Applied Optics, pp. 229-237.
McIntyre, C.M. and Harris, S.E., "Achromatic Wave Plates for the Visible Spectrum," J. Opt. Soc. of America (Dec. 1968) 58(12): 1575-1580.
Title, A.M., "Improvement of Birefringent Filters. 2: Achromatic Waveplates," Applied Optics (Jan. 1975) 14(1):229-237.
Pancharatnam, S., "Achromatic Combinations of Birefringent Plates," Indian Academy Science Proceed. (1955) 41:130-136.
"Continuous view of dc-balanced images on a ferroelectric liquid-crystal spatial light modulator", Douglas J. McKnight, Optical Society of America (1994).
Johnson Kristina M.
Sharp Gary D.
Chowdhury Tarifur R.
ColorLink, Inc.
Sikes William L.
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