Striating liquid crystal display substrates with ultrasonically

Details Striating liquid crystal display substrates with ultrasonically Striating liquid crystal display substrates with ultrasonically

1981-03-30

1983-11-01

Corbin, John K.

G02F 113, G02F 1137

Patent

active

044127243

ABSTRACT:
There is disclosed herein a method for producing a liquid crystal display or cell which has a liquid crystal film positioned between a pair of substrate members whose surfaces have been ultrasonically surface treated so as to cause the liquid crystal molecules to be aligned in a predetermined manner.
The method includes ultrasonically treating the surface of the substrate which contacts the liquid crystal film so as to form microgrooves or striations. The surface is treated by immersing the substrate in a liquid bath, ultrasonically forming a column of cavitation bubbles which is directed to the substrate where the cavitation bubbles collapse on the substrate, and moving the substrate through the liquid at a predetermined speed so as to form microgrooves or striate the surface of the substrate. Using two such treated substrates, a liquid crystal cell is prepared in the form of a sandwich of substrate/liquid crystal/substrate.

REFERENCES:
patent: 3787110 (1974-01-01), Berreman et al.
patent: 3821720 (1978-06-01), Gruebel et al.
patent: 3912369 (1975-10-01), Kashnow
patent: 4012118 (1977-03-01), Becker et al.
Flanders et al., "Alignment of Liquid Crystals using Submicrometer Periodicity Gratings", Appl. Phys. & Ltt., vol. 32, No. 10 Mass., May 15, 1978, pp. 597-598.
Priestly et al., Introduction to Liquid Crystals, Plenum Pub. Corp., New York.

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