Inducing tilted parallel alignment in liquid crystals

Details Inducing tilted parallel alignment in liquid crystals Inducing tilted parallel alignment in liquid crystals

1994-08-02

1996-04-30

Nguyen, Nam

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

20419215, 20419226, 427108, 427167, 427344, C23C 1434

Patent

active

055121489

ABSTRACT:
A substrate is treated prior to use to induce a near-parallel orientation of a liquid crystal director relative to the substrate. A layer of silica is deposited on the substrate by in-line magnetron sputtering as the substrate is moved past the sputtering target, and the silica-coated substrate is thereafter treated with an alcohol that is selected from one of two classes of alcohols: (1) alcohols having an aromatic ring structure on one end of an aliphatic chain and a hydroxy group on the other end, with or without at least one ether group in the chain, and (2) an aliphatic chain having a hydroxy group at one end and at least one ether linkage in the chain. An example is 2-phenylethanol. The alcohol-treated substrate is covered with a layer of the liquid crystal. The process of the invention induces a tilt to the director of the liquid crystal. The tilt is about 0.5.degree. to 4.degree., as measured parallel to the surface of the substrate.

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W. P. Bleha, "Progress in Liquid Crystal Light Valves", Laser Focus/Electro-Optics, pp. 111-120 (Oct. 1983).
J. L. Janning, "Thin film surface orientation for liquid crystals", Applied Physics Letters, vol. 21, pp. 173-174 (1972).

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