Compensation method of antiferroelectric liquid crystal device characteristic variation caused by temperature changing

摘要

The antiferroelectric liquid crystal (AFLC) display is promising for it's tristable switching, no-ghost effect and good mechanical stability. Recently, Yamamoto et al. have realized the full-color AFLC display with analog gradation based on in-pixel domain switching. One of the advantages of AFLC device compared with FLC device is that it can realize gray level display. But AFLCD characteristics has dependence of temperature. In our experiment, AFLCD was prepared to study this problem. The panel's threshold voltage, cone angle, response time, contrast ratio and electro-optical curves was measured at variable temperature. And we discussed the mechanism of gray level's distortion while the temperature changed in the case of the same driving scheme applied. At last we brought out a proposal to solve this problem. The electro-optic curves of AFLCD in a temperature range was measured. Some temperature sensors were put on the panel to detect it's temperature, and we set a temperature standard. Compared the detected temperature and the standard, and then adjust the electric wave forms to get the same gray levels at variable temperature.