Liquid crystal device alignment

G - Physics – 02 – F

Patent

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G02F 1/139 (2006.01) G02F 1/1337 (2006.01) G02F 1/1335 (2006.01) G02F 1/1339 (2006.01)

Patent

CA 2182963

A twisted nematic type of liquid crystal device comprises two cell walls enclosing a layer of a nematic or long pitch cholesteric liquid crystal material. The device has both an alignment direction and a surface tilt provided by an asymmetric groove structure alignment on one or both walls. The alignment treatment may be provided by a shaped layer of a photolithographic material. Embossing, ruling, or transferred from a carrier layer material may alternatively provide the alignment. The amount of twist may be multiples of about 90° and the device arranged between two polarisers.

Un dispositif à cristaux liquides de type nématique en hélice se compose de deux parois de cellule renfermant une couche de substance de cristal liquide nématique ou cholestérique à pas long. Le dispositif est caractérisé à la fois par un sens d'orientation et une inclinaison de surface assurée par un sens de structure de sillon asymétrique sur l'une des parois ou sur les deux parois. Le traitement d'orientation peut être assuré par la forme de surface d'une substance photolithographique. L'orientation est assurée par nervurage, par rainurage, ou par transfert de substance depuis une couche support. Les valeurs d'hélice peuvent être des multiples d'environ 90~, le dispositif étant disposé entre deux polariseurs.

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