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30.3: Master Parameter Governing the Response Time of Reflective Cholesteric Liquid Crystal Displays

We investigated theoretically and experimentally the response time of cholesteric liquid crystal displays (ChLCDs). It turned out that the response time depended more on the structural change of twisted layers of ChLCs than the speed of the individual reorientation of LC directors. Numerical calculations showed that the surface anchoring energy of the substrates governed the transition from the homeotropic to the planar texture: ChLCs anchored weakly (Ws ≤ 10−5J/m2) on the bounding substrates undergo homogeneous transition, which is fast, while ChLCs anchored strongly (Ws ≥ 10−3J/m2) undergo defect‐assisted heterogeneous transition, which is slow. Experimental results agreed well with the theoretical results.