Method and apparatus for tilted alignment of liquid crystals...

Details Method and apparatus for tilted alignment of liquid crystals... Method and apparatus for tilted alignment of liquid crystals...

G - Physics

02

F

117/128, 345/8

G02F 1/133 (2006.01) B05D 3/10 (2006.01) G02F 1/1337 (2006.01)

Patent

CA 1328380

METHOD AND APPARATUS FOR TILTED ALIGNMENT OF LIQUID CRYSTALS WITH IMPROVED PHOTOSTABILITY ABSTRACT OF THE DISCLOSURE Liquid crystals are induced to assume a uniform tilted alignment in the absence of an applied field by treating the surface of a substrate to provide a desired tilted surface microstructure and free hydroxyl groups. A long chain alcohol having the formula ROH, where R is a carbon chain having at least about 6 carbon atoms therein, is chemically reacted with the tilted surface microstruc- ture and the alkoxy groups derived therefrom are chemi- cally bonded to the microstructure. Subsequently intro- duced liquid crystals assume a tilted-perpendicular align- ment at a tilt angle of about 0.5° to about 6°. The liquid crystals exhibit a significantly greater photostability than has previously been achieved. The microstructure is preferably obtained by depositing sequential layers of SiOx at medium and shallow grazing angles, where x is from 1 to 2, with the substrate rotated 90° between deposi- tions.

546815

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