盒厚约束下液晶过压驱动光学反弹的非对称弛豫特性OA

Overdriving technology(OD)accelerates the response of liquid crystal(LC)devices but frequently induces significant optical bounce(OB).Based on the Ericksen-Leslie continuum theory,this paper establishes a finite-difference model and reveals that the physical origin of OB lies in the asynchronous relaxation of LC directors within the confined space.By simulating the spatial distributions of director tilt angle and angular velocity,it is found that the interlayer angular velocity difference induced by overdrive is the microscopic source triggering OB.Focusing on the cell gap(5～15 µm)as a key geometric parameter,this paper reveals the evolutionary laws of asynchronous relaxation constrained by cell gap and its regulatory mechanism on the asymmetric OB characteristics under overdrive modes.The simulated and experimental results exhibit consistent trends.The results demonstrate that,under a constant overdrive voltage difference,overshoot and undershoot driving exhibit opposite relaxation trends:during undershoot driving,the elastic restoring force decays quadratically with cell gap,making it difficult for thicker cells to suppress interlayer asynchronous relaxation;the bounce depth ratio(BDR)increases from approximately 2%at 5 µm to over 20%at 15 µm.During overshoot driving,the internal electric field attenuates linearly with cell gap,weakening the interlayer angular velocity difference at its source;the BDR decreases from 15.7%to below 4%.After eliminating the interference of driving field attenuation through constant electric field control experiments and constant average tilt-angle simulations,the BDR for both modes increases monotonically with cell gap.From the perspective of asynchronous relaxation,this study clarifies the dominant role of cell gap in governing asymmetric OB,providing a theoretical basis for the dimensional optimization of high-speed LC devices.