The double hysteresis loop of antiferroelectric liquid crystals at low frequency (1 Hz) produces a double symmetric optical output when polarizers are adequately oriented along the induced optical axis. The antiferroelectric (dark) state is centered at 0 V and identical gray levels are obtained for positive and negative pulses of the same amplitude. This symmetric behavior is found, for example, when the alignment of AFLC material is induced by rubbed polymer coatings such as nylon 6 or polyimide. If inner surfaces are differently coated, however, asymmetric response may be induced. A voltage shift of the entire hysteresis curve has been found when cells are assembled with buffed polymer on one plate and obliquely evaporated SiO x onto the other plate. The asymmetry lowers the threshold voltage on one side (e.g., positive voltage) while increases the threshold voltage on the other side. This voltage shift gives rise to a new addressing mode for AFLC displays.