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Method for the spatial control of the pretilt angle: (a) Planar cell filled with LC-RM mixture; (b) LC-RMs mixture separation in the external electric field (pre-cure voltage); (c) formation of the polymer layer in the vicinity of the LC cell substrates by local UV light-induced polymerization (UV curing); (d)cell with spatially varied pretilt after curing.
The angle of the director to the cell surface as a function of applied voltage and distance from the surface.
Dependency of pretilt angle on the duration of the polymerization step for different voltages applied during polymerization.
Dependency of pretilt angles on the duration of the polymerization step for different frequencies when 80 V AC is applied during polymerization.
Microphotographs of cells which were pre-cured for 5 min at 100 V 60 Hz AC,and cured at 100 V 60 Hz AC through a0.2 mm slit for 10 min. (a) Cured under 3.5 mW/cm2. (b) Cured under 28 mW/cm2.
Optical characterization of the LC cell with patterned variable pretilt angles. (a) Image of the cured area under monochromatic light; (b) pretilt angles across the cured area.
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