We demonstrate for the first time a color filter system, based on reflective cholesteric polymers, which has no major absorptive components. We report the principles of operation, process outline, optical properties, color coordinates, extinction curves, evidence for light recycling, brightness enhancement and related issues.
Thin liquid crystal films in the range from 0.4 to 10 μm were thermally evaporated on solid surfaces. Semistable films were maintained on obliquely evaporated SiO surfaces that induce homeotropic, homogeneous, or tilted alignment. Realignment which violates the boundary conditions was observed in the smectic phase of thin films. The nematic phase of homogeneously aligned films has a peculiar two-domain texture indicative of a spontaneous twist due to conflicting and degenerate boundary conditions.
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