Research progress on liquid crystal optical devices with viewing angle control characteristics
Benefiting from optical anisotropy and adaptive stimulus-responsive properties,liquid crystals(LCs)have been utilized as critical materials in the preparation of various functional optical devices.Among these,optical devices with viewing angle control characteristics,such as LC display and LC smart window,show great potential in fields like display privacy protection,sunlight modulation,light field shaping and anti-reflection.As the core components of such devices,a series of optical units with angle-dependent light transmission properties have been designed and integrated in recent years,enabling LC devices to meet the viewing angle control requirements of different application scenarios,such as narrow viewing angle control,specified viewing angle control,or dynamic viewing angle adjust ability.This article introduces viewing angle control units based on different types of LC or non-LC materials,summarizes the differences in their view angle control mechanisms,discusses the challenges they face in practical applications,and offers a perspective on their future development trends and potential application scenarios.
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