Patent
1986-10-14
1991-04-30
Miller, Stanley D.
350341, G02F 113
Patent
active
050112678
ABSTRACT:
Liquid crystals are induced to assume a uniform tilted alignment in the absence of an applied field by treating the surface of a substrate to provide a desired tilted surface microstructure and free hydroxyl groups. A long chain alcohol having the formula ROH, where R is a carbon chain having at least about 6 carbon atoms therein, is chemically reacted with the tilted surface microstructure and the alkoxy groups derived therefrom are chemically bonded to the microstructure. Subsequently introduced liquid crystals assume a tilted-perpendicular alignment at a tilt angle of about 0.5.degree. to about 6.degree.. The liquid crystals exhibit a significantly greater photostability than has previously been achieved. The microstructure is preferably obtained by depositing sequential layers of SiO.sub.x at medium and shallow grazing angles, where x is from 1 to 2, with the substrate rotated 90.degree. between depositions.
REFERENCES:
patent: 3834792 (1974-09-01), Janning
patent: 3967883 (1976-07-01), Meyerhofer et al.
patent: 4022934 (1977-05-01), Miller
patent: 4030997 (1977-06-01), Miller et al.
patent: 4196974 (1980-04-01), Hareng et al.
patent: 4256377 (1981-03-01), Krueger et al.
patent: 4464134 (1984-08-01), Lackner et al.
Wilson et al., "Alignment of LC on Surfaces with Films Deposited Oliquely at Low and High Rates", Mol. Cryst. Liq. Crystal, 1983, vol. 94, pp. 359-366.
E. P. Raynes et al., "Liquid Crystal Surface Alignment Treatment Giving Controlled Low angle Tilt", Molecular Crystal Liquid Crystal Letters, vol. 34, 1976, Gordon and Breach Science Publishers Ltd. (New York), pp. 105-110.
Grinberg et al., "Photoactivated Birefringent Liquid Crystal Light Valve for Color Symbology Display", IEEE Transactions on Electron Devices, vol. ED-22, pp. 775-783, Sept., 1975.
W. Urbach et al., "Alignment of Nematics and Smectics on Evaportated Films", Applied Physics Letters, vol. 25, No. 9, Nov. 1974, pp. 479-481.
K. Fahrenschon et al., "Properties of Pretilted Liquid Crystal Structures", J. of Electrochem Society, vol. 124, No. 6, Jun. 1977, pp. 953-955.
D. Armitage, "Alignment of Liquid Crystals on Obliquely Evaporated Silicon Oxide Films", J. Appl. Phys. 51 (5), 1980, pp. 2552-2555.
J. D. Margerum et al., "Effects of Molecular Length on Nematic Mixtures . . .", Molecular Crystals and Liquid Crystals, vol. 68, pp. 157-174, (1981).
L. J. Miller et al., "A New Method For Inducing Homeotropic and Tilted Silica Surfaces Alignments of Nematic Liquid Crystals", Liquid Crystal and Ordered Fluids, vol. 3, Plenum Pub. Corp., 1978, pp. 513-530.
M. J. Little et al., "A New Method for Inducing Homogeneous Alignment of Nematic Liquid Crystals", Liquid Crystal and Ordered Fluids, vol. 3, Plenum Publishing Corp., 1978, pp. 497-511.
Milo R. Johnson, et al., "Low-Tilt-Angle Nematic Alignment Compatible with Frit Sealing", IEEE Transactions on electron Devices, vol. ED -24, No. 7, Jul. 1977, pp. 805-807.
F. Y. Yamagishi et al., "Photochemical and Thermal Stability Studies on a Liquid Crystal Mixture of Cyanobiphenyls", Liquid Crystals and Ordered Fluids, Pub. Elenum Press, NY, vol. 3, 1978, pp. 475-496.
W. R. Heffner et al., "Liquid Crystal alignment of Surfactant Treated Obliquely Evaporated Surfaces", Applied Physics Letters, 36 (2), Jan. 15, 1980, pp. 144-146.
L. Rousille et al., "Liquid Crystal Quasihomeotropic Orientation Induced by a Polymer Deposited on a SiO Surface", J. Appl. Phys. 50 (6), Jun. 1979, pp. 3975-3977.
Lackner Anna M.
Margerum J. David
Miller Leroy J.
Smith, Jr. Willis H.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Aircraft Company
Miller Stanley D.
Phan Trong
LandOfFree
Method for tilted alignment of liquid crystals with improved pho does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for tilted alignment of liquid crystals with improved pho, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for tilted alignment of liquid crystals with improved pho will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-636729