A wide spectra color-reflective device based on polymer-sustained conical helix (PSCH) of cholesteric liquid crystal (CLC) is demonstrated. The phase-separated three-dimensional polymer network transcribes the helicoidal structure of a CLC and sustains the deformation of helices by the external electric field for wide spectrum turning. Besides the selective reflection of light, the device also demonstrates light-scattering focal conic texture in off-state and transparent homeotropic state at high electric field. The new electro-chromic devices with PSCH that can reversibly change of wide-range colors in response to ascending and descending of electric field are promising in various fields including smart windows, sensors, displays, and camouflage applications.
We experimentally demonstrate fast flexoelectro-optic switching in a liquid crystal cell containing bimesogen-doped and polymer-stabilized cholesteric. The device exhibits a response time of less than 0.7 ms and with low hysteresis and color dispersion which is suitable for potential applications including field-sequential color displays.
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