Liquid crystal cell using the electrically controlled birefringe

Details Liquid crystal cell using the electrically controlled birefringe Liquid crystal cell using the electrically controlled birefringe

1987-02-17

1989-12-26

Miller, Stanley D.

350339R, 350347R, G02F 113

Patent

active

048894125

ABSTRACT:
Liquid crystal cell using the electrically controlled birefringence effect and processes for the production of the cell and a uniaxial medium or material of negative optical anistropy usable therein.
The cell can comprise two crossed rectilinear polarizers, two glass plates provided with transparent electrodes and placed between said polarizers, a liquid crystal layer between the plates and, between a plate and a polarizer, a layer of a negative uniaxial thermoplastic polymer having its extraordinary axis perpendicular to the plates. This layer can be obtained by heating the polymer up to the isotropic state, under a uniform presure on the polarizers, cooling and eliminating the pressure. Application to the production of data display devices.

REFERENCES:
patent: 3694053 (1972-09-01), Kahn
patent: 4701028 (1987-10-01), Clerc et al.
Shanks, I. A., "Electro-Optical Colour Effects by Twisted Nematic Liquid Crystal," Electronics Lett., vol. 10, No. 7, (apr. 1974) pp. 90-91.
Clerc, F., "Electro-Optical Limits of the E.C.B. Effect in Nematic Liquid Crystals," Displays, (Oct. 1981), pp. 341-347.
Robert, J. "TV Image with Liquid-Crystal Display," IEEE Transactions on Electron Devices, vol. ED-26, No. 8, (Aug. 1979), pp. 1128-1133.

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