For the purpose of developing liquid crystalline microactuators, we have proposed a one-dimensional simple model which combines the motion of the upper plate of a liquid crystal cell and the flow of a liquid crystal. The model is able to predict qualitatively the motion of the upper plate. We have studied the rotation of the director and it is clarified that when the electric field is released, the molecule at the middle position between two plates returns to the initial angle completely at 1 Hz of the frequency of the applied voltage, it does not return to the initial angle but it takes approximately 40 deg at 10 Hz, and it oscillates between 90 deg and 96 deg. at 100 Hz. The so-called kickback effect is dominant in this oscillation with small amplitude.
