Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1999-01-26
1999-10-19
Parker, Kenneth
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349181, G02F 113
Patent
active
059697857
ABSTRACT:
An optical display employs a liquid crystal cell with a d.DELTA.n/.lambda. of approximately 0.2-0.8, allowing the cell's optical transmissivity to be modulated by an applied electric field through a dominant non-polarization rotation effect. For visible wavelengths, d.DELTA.n is approximately 0.1-0.4 microns, with a preferred value of about 0.25 microns. Applications include a reflective projection display in which input light is polarized at a greater than 0.degree. and less than 90.degree. angle, preferably about 20.degree., to the input LC directors of a twisted nematic cell; a reflective direct view system in which a quarter-wave plate is substituted for a polarization analyzer; and both a reflective and a transmissive guest-host system in which optical absorption by dye molecules is the dominant modulation mechanism.
REFERENCES:
patent: 4252417 (1981-02-01), Scheffer et al.
patent: 4291949 (1981-09-01), Wada et al.
patent: 4396250 (1983-08-01), Wada et al.
patent: 4398803 (1983-08-01), Pohl et al.
patent: 4527864 (1985-07-01), Dir
patent: 4556286 (1985-12-01), Uchida et al.
patent: 4944577 (1990-07-01), Yoshida
patent: 5361151 (1994-11-01), Sonehara
patent: 5490003 (1996-02-01), Van Sprang
patent: 5555113 (1996-09-01), Mulkens
Bahadur, "Liquid Crystal Applications and Uses", vol. 3, chapter 11, Singapore, 1992.
Schadt and Helfrich, "Voltage-Dependent Optical Activity of a Twisted Nematic Liquid Crystal", Applied Physics Letters, vol. 18, No. 4, Feb. 15, 1971, pp. 127-128.
Gooch and Tarry, "The optical properties of twisted nematic liquid crystal structures with twist angles .ltorsim.90.degree.", J. Phys. D:Appl. Phys., vol. 8, 1975, pp. 1575-1584.
Born and Wolf, Principals of Optics--Electromagnetic Theory of Propagation, Interference and Diffraction of Light, 6th ed., Pergamon Press, 1980, pp. 694-696.
Cole and Kashnow, "A new reflective dichronic liquid-crystal display device", Applied Physics Letters, vol. 30, No. 12, Jun. 15, 1977, pp. 619-621.
Duraiswamy V. D.
Hughes Electronics Corporation
Parker Kenneth
Sales M. W.
LandOfFree
Reflective-type liquid crystal display using polarizer free mixe does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reflective-type liquid crystal display using polarizer free mixe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reflective-type liquid crystal display using polarizer free mixe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2062923