Electro-optical devices using liquid crystals having a twist in

Details Electro-optical devices using liquid crystals having a twist in Electro-optical devices using liquid crystals having a twist in

1983-04-21

1986-01-14

Corbin, John K.

350346, 350332, G02F 113

Patent

active

045642664

ABSTRACT:
An electro-optical method and apparatus uses liquid crystals. The method includes the step of filling a space between two parallel transparent plates with a material which comprises molecules having nematic properties, the structure of the molecules initially defining a substantially rectilinear nematic director perpendicular to the plates. A structure is then conferred on the material defining a second nematic director curved at least once in a plane perpendicular to the plate by application of a high frequency electrical field to the material, such that the second nematic director arrives substantially perpendicularly at at least one of the two plates. A twist is imparted to the second nematic director along a component at right angles to said plane perpendicular to the plates to impart a twist in the second nematic director. Light is caused to arrive with an incidence substantially at right angles to one of the plates to pass through the material, a rotation of polarization of the light, at an outlet from the plates, depending on the twist imparted to the second nematic director.

REFERENCES:
patent: 4114990 (1978-09-01), Mash et al.
patent: 4214819 (1980-07-01), Pohl et al.
"Deformation of a Pretilted Nematic Liquid Crystal Layer in an Electric Field", K. Fahrenschon, H. Gruler & M. F. Schiekel, Applied Physics, vol. 11, pp. 67-74, 1976.
"Field-Induced Deformation of Hybrid-Aligned Nematic Liquid Crystals: New Multicolor Liquid Crystal Display", S. Matsumoto, M. Kawamoto & K. Mizunoya, Journal of Applied Physics, vol. 47, No. 9. pp. 3842-3845, Sep. 1976.

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