Disclosed herein is a polar nematic liquid crystal assembly. The liquid crystal assembly comprises 5˜7.5% by weight of a dopant having the structure of Formula 1 below: (wherein X is an alkyl, alkenyl or heteroalkyl group having three or more carbon atoms) and 92.5˜95% by weight of smectic liquid crystal molecules having a linear alkyl chain wherein the N-bonding moiety of the dopant is spontaneously bonded to the alkyl chain of the smectic liquid crystal molecules to induce macroscopic spontaneous polarization in a particular direction.