Liquid crystal device alignment layer having an asymmetric profile grating on its surface
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United States of America Patent
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Mar 3, 1998
Grant Date -
N/A
app pub date -
Aug 6, 1996
filing date -
Feb 9, 1994
priority date (Note) -
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Abstract
The invention provides a liquid crystal device having an aligned and surface tilted liquid crystal layer contained between two cell walls. The cell walls carry electrodes for applying voltages across the layer thickness to provide a display. The alignment is provided by a layer of a material that undergoes optically induced ordering during cross linking. That is, a material capable of aligning liquid crystal molecules after cross linking with polarized light. One such material is polyvinylcinnamate. The aligning layer is profiled with an asymmetric grating, eg approximately sawtooth in cross section by interferometer, oblique incidence photolithography, or embossing. The shape of the grating provides the surface tilt. The liquid crystal material may be nematic, cholesteric, or smectic.
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