An antiferroelectric liquid crystal panel not exhibiting a blackening phenomenon due to temperature change and comprising a pair of substrates and an antiferroelectric liquid crystal which is interposed between the substrates and to which a chiral agent whose helical axis is generally parallel to the normal of the substrate is added. The chiral agent added may be clockwise or counterclockwise with respect to the helical axis. Alternatively, the two types are added to the antiferroelectric liquid crystal. The Jones's vector of the light emerging from a liquid crystal cell is found, and the angle of shift between the upper and lower chevrons is calculated.