A semi-empirical equation for the response time of in-plane switching liquid crystal display and measurement of twist elastic constant

Liquid crystal display using combined fringe and in-plane electric fields Appl. Twist angle effects on the dynamic response of in-plane-switching liquid crystal displays Appl. A robust design against comb electrode spacing variations for in-plane switching mode thin-film transistor liquid-crystal displays Threshold behavior analysis of in-plane switching mode liquid-crystal cells with asymmetrical surface condition Appl. A semi-empirical equation is developed to characterize the optical decay time of in-plane switching (IPS) and fringe field switching (FFS) liquid crystal displays. This equation takes the effects of elastic constants, cell gap, liquid crystal material, rubbing angle, and anchoring strength into account simultaneously. Good agreement between simulation and experiment is obtained. Moreover, this equation can be used to measure the twist elastic constant K 22 of liquid crystals. The measured temperature-dependent K 22 values of 5CB agree well with previously published results. Hence, our equation not only describes the response time of IPS and FFS cells but also provides a simple yet accurate method to determine the twist elastic constant of liquid crystal materials .