| Summary: | 博士 === 國立交通大學 === 機械工程系所 === 102 === The dynamic behavior of LC molecules is an interesting phenomenon among liquid crystal optical responses. The dynamics of LCs is related not only to material properties of LCs, electric field, and magnetic fields. Ripple-like expansion is observed when displays are subject to tactile forces. This dissertation contributes to liquid crystal dynamics subject to tactile forces. Since nematic LCs can flow as easily as an isotropic fluid, there is a coupling between the translational motion and molecule's rotation of LCs. According to the visco-elasticity theory and the continuum theory of Ericksen-Leslie, this study constructs theoretical models for nematic liquid crystals in order to investigate the cause of ripple propagation. The governing equation is derived by using visco-elastic and wave equations. Experimental results show that each display panel has its own wave propagation velocity, which is not changed by different touch speeds. In addition, displays with a larger amount of liquid crystals lead to slower ripple speed. Based on the Ericksen-Leslie theory, tactile-force effects are taken into account to derive the molecule equation of motion for LCs. The comparison results show that analytical solutions are consistent with numerical solutions. Finally, factors that affect tilt angles are investigated for different LC materials and coefficients.
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