Alignment technique for liquid crystal devices

Details Alignment technique for liquid crystal devices Alignment technique for liquid crystal devices

1985-04-26

1987-05-12

Griffin, Donald A.

350350S, G02F 1133, G02F 116

Patent

active

046644806

ABSTRACT:
In a liquid crystal device one interior surface of the cell is coated with a polymer (e.g., a crystalline polymer such as PET) which, when rubbed, produces alignment of the liquid crystal molecules, and the opposite interior surface is coated with a material (e.g., an amorphous polymer, such as PMMA) which, even if rubbed, does not produce such alignment. Also described is a combination of an aligning polymer and a non-aligning, non-polymer (e.g., a silane surfactant or bare ITO). This technique is particularly useful in producing alignment of relatively thick, ferroelectric smectic liquid crystal cells.

REFERENCES:
patent: 3930716 (1976-01-01), Robert
patent: 4030997 (1977-06-01), Miller et al.
patent: 4165922 (1979-08-01), Morrissy
patent: 4257682 (1981-03-01), Suzuki et al.
patent: 4469409 (1984-09-01), Nakano et al.
"A Reliable Method of Alignment for Smectic Liquid Crystals," Ferroelectrics, vol. 59 (1984), pp. 137-144, J. S. Patel et al.

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