Surface alignment of liquid crystal multilayers evaporated on a photoaligned polyimide film observed by surface profiler
In order to successfully fabricate a commercial Liquid Crystal Display, uniform orientation of the liquid crystal (LC) molecules is required. Traditionally this molecular alignment of liquid crystal is achieved by physically or chemically treating the surface. A simple method used to achieve preferred orientation is rubbing but this may produce dust, static charging and mechanical damage which deteriorates the production yield.
One of the more attractive alternatives to rubbing is the generation of a surface anisotropy of an alignment film by photochemical reaction called “photoinduced alignment”. In general, photoinduced alignment is achieved by exposing with both unpolarized and polarized ultraviolet (UV) light on a photoalignment polymer film.
Dr. Ian Birkby | EurekAlert!
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