We investigated the dynamics of E-field induced Freedericksz transition in the Nematic Liquid Crystal(NLC) cells having homogeneous alignments through the measurements of electro-optic transmittances and dielectric constants. The explicit relation between the phase difference and the distribution of directors in the measurement of electro-optic transmittances were approximately established within the scope of $(E-E_{th})/E_{th}≪1$. The time-dependence of the experimentally acquired phase differences in the switching-on and off processes with the E-field applied for a relatively short time(~100 ms) were in good agreement with the prediction of the theory which only included the rotation of directors by external fields.
In the measurement of dielectric constants with the E-field applied for a relatively long time(~100 ms), we observed the tendency that after the completion of the transition the deformation of directors were slowly reduced as time went on. This seems to be the phenomenon having relation with the fluidity of NLC and ionic motions, which can affect director motion.
