Patent ID: 8659728

Claim:
A liquid crystal display device, comprising: first and second substrates each having a positive photo-elastic constant property and being an optical isotropic body when stress is not applied to the first and second substrates, the first and second substrates being the thickest among members constituting the liquid crystal display device and having the most retardation when an external force is applied to the liquid crystal display device such that the retardation in the substrates becomes retardation in the liquid crystal display device; a liquid crystal layer disposed between the first and second substrates and in direct contact with the first and second substrates; and first and second compensation films in direct contact with the first and second substrates, respectively, each compensation film having a negative photo-elastic constant (NPEC), wherein the first and second compensation films remove a photo-elastic effect of the first and second substrates that occurs when stress is applied to one of the first and second substrates to minimize retardation of light, and wherein the first and second NPEC compensation films are formed of a high polymer that includes styrene maleic anhydride.