Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1995-05-01
1997-09-16
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349176, 2522997, G02F 11335, G02F 113
Patent
active
056686145
ABSTRACT:
An improvement in a light modulating chiral nematic liquid crystal adapted to form focal conic and twisted planar textures and a liquid crystal device employing such a material, the improvement wherein the liquid crystal material includes a plurality of essentially distinct regions within which the liquid crystal has different pitch lengths, whereby the liquid crystal can be made to reflect different wavelengths of light in different regions. The regions are created by including in the chiral nematic liquid crystal composition, a chiral material adapted to change its chirality upon photo-irradiation, in an amount effective to change the pitch length of the liquid crystal composition upon photo-irradiation. By exposing different regions of the material to increasing amounts of photo-irradiation, the pitch length of each region can be selectively tuned to reflect light of a different wavelength.
REFERENCES:
patent: 3585381 (1971-06-01), Hodson et al.
patent: 3600060 (1971-08-01), Churchill et al.
patent: 3620889 (1971-11-01), Baltzer
patent: 3650603 (1972-03-01), Heilmeier et al.
patent: 3656909 (1972-04-01), Dixon et al.
patent: 3663390 (1972-05-01), Fergason et al.
patent: 3680950 (1972-08-01), Haas et al.
patent: 3703331 (1972-11-01), Goldmacher et al.
patent: 3711713 (1973-01-01), Wysocki et al.
patent: 3795529 (1974-03-01), Cartmell et al.
patent: 3806230 (1974-04-01), Haas
patent: 3816786 (1974-06-01), Churchill et al.
patent: 3821720 (1974-06-01), Greuber et al.
patent: 3871904 (1975-03-01), Haas et al.
patent: 3885982 (1975-05-01), Fergason et al.
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 3947183 (1976-03-01), Haas
patent: 3969264 (1976-07-01), Davis
patent: 4022706 (1977-05-01), Davis
patent: 4070912 (1978-01-01), McNaughton
patent: 4077260 (1978-03-01), Gray et al.
patent: 4097127 (1978-06-01), Haas et al.
patent: 4161557 (1979-07-01), Suzuki et al.
patent: 4252417 (1981-02-01), Scheffer et al.
patent: 4408201 (1983-10-01), Harada
patent: 4447132 (1984-05-01), de Zwart
patent: 4671618 (1987-06-01), Wu et al.
patent: 4673255 (1987-06-01), West et al.
patent: 4685771 (1987-08-01), West et al.
patent: 4688900 (1987-08-01), Doane et al.
patent: 4890902 (1990-01-01), Doane et al.
patent: 4994204 (1991-02-01), Doane et al.
patent: 5082351 (1992-01-01), Fergason
patent: 5087387 (1992-02-01), Mullen et al.
patent: 5116528 (1992-05-01), Mullen et al.
patent: 5138472 (1992-08-01), Jones et al.
patent: 5170271 (1992-12-01), Lackner et al.
patent: 5172256 (1992-12-01), Sethofer et al.
patent: 5251048 (1993-10-01), Doane et al.
patent: 5384067 (1995-01-01), Doane et al.
patent: 5453863 (1995-09-01), West et al.
patent: 5506704 (1996-04-01), Broer et al.
Heilmeier et al, A New Electric Field Controlled Reflective Optical Storage Effect in Mixed Liquid Crystal Systems, Proc IEEE vol. 51 No. 1 pp. 34-38 (1969).
Dir et al. Cholesteric Liquid Crystal Texture Change Displays, Proc SID, vol. 13 pp. 105-113 (1972).
Hulin, Pharametric Study of the Optical Storage Effect in Mixed Liquid Crystal Systems, Appl. Phys. Lett. vol. 21 pp. 455-457 (Nov. 15, 1972).
Greubel et al., Electric Field Induced Texture Changes in Certain Nematic/Cholesteric Liquid Crystal Mixtures; Mol. Crys. Liq. Crys. vol. 24 pp. 1030-1011.
White et al. New Absorptive Mode Reflective Liquid-Crystal Display Device J. Appl. Phys vol. 45, pp. 4718-4723-Nov. 1974.
Gray, Dyestuffs and Liquid Crystals, Chimia vol. 34, p. 47 Feb. 1980.
Wysocki et al. Electric Field Induced Phase Change in Cholesteric Liquid Crystals, Physical Review Letters vol. 20 No. 19 pp. 1024-1025 (1968).
Muller, Effects of Electric Fields on Cholesterol Nonanoate Liquid Crystals, Molecular Crystals vol. 2 pp. 167-188 (1966).
Harper, Voltage Effects In Cholesteric Liquid Crystals, Molecular Crystals, vol. 1, pp. 325-332 (1966).
West, Phase Separation of Liquid Crystals in Polymers, Mol. Cryst. Liq Cryst. vol. 157 pp. 427-441 (Apr. 1988).
Mochizuki et al. A 1120.times.768 Pixel Four-Color Double-Layer Liquid Crystal Projection Display, Proc SID vol. 31 No. 2 p. 15 (1990).
Wysocki, Electric Field Induced Phase Change in Cholesteric Liquid Crystals, Research Laboratories, Xerox Corp pp. 47-65--date unknown.
Gerber, Voltage Induced Cholesteric Structure Transformation in Thin Layers, Z. Naturforsch. pp. 718-726 (1981).
Hikmet, Structure of Cholesteric Gels & Their Electrically Induced Light Scattering & Color Changes, Liquid Crystals vol. 12 No. 2 pp. 319-336 (1992).
Hikmet, Electrically Induced Light Scattering From Anisotropic Gels J. Appl. Appl. Phys. vol. 68 No. 9 pp. 4406-4412 (Nov. 1, 1990).
Hikmet, Anisotropic Gels & Plasticized Networks Formed by Liquid Crystal Molecules, Liquid Crystals, vol. 98, pp. 405-416 (1991).
Wu et al. Zero Field, Multistable Cholesteric Liquid Crystal Displays Submitted for presentation at Workshop on Display Material date unknown.
Yang et al, Cholesteric Liquid Crystal/Polymer Gel Dispersion Bistable at Zero Field--1991 IEEE pp. 49-52 (Aug. 1991).
Yang et al. Cholesteric Liquid Crystal/Polymer Dispersion For Haze Free Shutters--Appl. Phys. Lett 60, pp. 3101-3104 (1992).
Doane--Front-Lit Panel Display Form Polymer Stabilized Cholesteric Textures, Oct. 1992.
Yang et al., Cholesteric Liquid Crystal/Polymer Gel Dispersion Reflective Display Application, May 1992.
Doane et al, Current Trends in Polymer Dispersed Liquid Crystals, 1991 IEEE pp. 175-178 (Aug. 1991).
Jiang et al., Electro-Optics of Multi-Cholesteric Focal Conic Texture with Polymer, Chem Express vol. 6, pp. 1005-1003 (1991).
Aliev, Three State of a Cholesteric Liquid Crystal In Micropores CA Selects-Liquid Crystals 12 pp. 1-7 (1985).
Candau et al. Magnetic Field Effects in Nematic & Cholesteric Droplets Suspended In An Isotropic Liquid--Mol. Cryst. vol. 23 pp. 283-287 (73).
Terao, et al. Fabrication of Fine Barrier ribs for Color Plasma Display Panels by Sandblasting, SID 92 Digest, pp. 724-727.
Hochgesand et al, New Chiral Dopants with High Helical Twisting Power in Nematic Liquid Crystals, pp. 3-22 (Jul. 1989).
L. T. Thompson, Introduction to Microlithography, ACS Symposium Series 219, pp. 3-11 (Mar. 1983).
Binkley et al., Photoremovable Protecting Groups pp. 375-423.
Turro, Photofragmentation Reactions, Modern Molecular Photochemistry, pp. 532-571.
Lewis et al, Cage Effects in the Photochemistry of (S)-(+)-2-Phenylpropiophenone, Journal of American Chemical, pp. 5973-5976 (Sep. 1973).
Coyle, Photochemistry of Organic Carbonly Compounds, Introduction of Organic Photochemistry, pp. 106-125 (1986).
Reetz, Enantioselective Addition of Chirally Modified Methyltitanium Reagents . . . Tetrahedron Letters vol. 27--No. 47--pp. 5111-5114.
Sur et al. ESR Characterizations and Photochemistry of the Free Radical Species . . . Spectroscopy Letters 22(8) pp. 965-971 (1989).
Haas et al. Interaction Between UV Radiation & Cholesteric Liquid Crystals, Molecular Crystals & Liquid Crystals vol. 7, pp. 371-379 (1969).
Yarmolenko et al., Photosensitive Chiral Dopants with High Twisting Power, Liquid Crystals, vol. 16 No. 5 pp. 877-882 (1994).
Maurer et al. Cholesteric Reflectors with a Color Pattern, SID 94 Digest, pp. 399-402.
Haberle et al, Right & Left Circular Polarizing Colorfilters Made from Crosslinkable Cholesteric LC-Silicones-pp. 57-59 (1991).
Cram et al, Electrophilic Substitutions at Saturated Carbon Stereochemical Capabilites . . . vol. 83, (May 20, 1961).
Cameron et al, Photogeneration of Organic Bases from o-Nitrobenzyl derived Carbamates , J. Am. Chem. pp. 4303-4313 (1991).
Heppke et al., Blue Phase Mixtures Exhibiting Low Fractions of a Chiral Compound . . . Liquid Crystals, vol. 8, pp. 407-418 (1990).
Heppke et al, Angular Dependence of Blue Phase Selective Feflection in the Electric Field, Mol. Cryst. Liq. Cryst. vol. 150b pp. 265-276 (87).
Heppke et al. Electrostriction of the Colesteric Blue Phases BPI & BPII in Mixtures with Positive . . . J. Phys. pp. 2991-2998 (1989).
Davidson et al, Mechanism of the Photoinduce Decarboxylation of Carboxylic Acids . . . pp. 1357-1362 (1972).
Chien Liang-Chy
Doane Joseph William
Kent State University
Miller Charles
Sikes William L.
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