High-contrast cholesteric liquid crystal displays under pulse modulation: dark-state-initiated driving scheme

This study investigates the contrast performance of cholesteric liquid crystal (CLC) reflective displays under panel-relevant short driving times. When the device starts from the planar state, shortened driving time leads to incomplete dark-state formation, increased dark-state reflectance, and contrast degradation. In contrast, starting from the focal conic state preserves the low-reflectance dark state more effectively, maintaining relatively stable contrast below 10 ms. These results indicate that the initial state is a critical parameter in short-time CLC operation and that the dark-state-initiated driving scheme provides an effective approach for preserving contrast performance.