Liquid crystal display device and method for manufacturing same

A liquid crystal display device, comprising

• a pair of substrates arranged opposite to each other,
• an electrode group disposed on one side or both sides of the pair of substrates facing each other,
• a plurality of active devices connected to the electrode group,
• a liquid crystal alignment film disposed on each facing side of the pair of substrates, and
• a liquid crystal layer between the pair of substrates,
• wherein the liquid crystal alignment film is manufactured by irradiating linearly polarized light to a film obtained from polyamic acid or a derivative thereof having a photoisomerization structure in the main chain, and
• the liquid crystal layer comprises a liquid crystal composition having negative dielectric anisotropy and including at least one of liquid crystal compounds represented by Formula 1 as a first component:
• wherein R1 and R2 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons, where arbitrary hydrogen is replaced by fluorine;
• ring A and ring B are independently 1,4-cyclohexylene, tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,5-difluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2-fluoro-3-chloro-1,4-phenylene, 2,3-difluoro-6-methyl-1,4-phenylene, 2,6-naphthalenediyl, or 7,8-difluorochroman-2,6-diyl, and at least one of ring A and ring B is 2,3-difluoro-1,4-phenylene, 2-fluoro-3-chloro-1,4-phenylene, 2,3-difluoro-6-methyl-1,4-phenylene, or 7,8-difluorochroman-2,6-diyl;
• Z′ is independently a single bond, —(CH2)2—, —CH2O—, —COO—, or —CF2O—;
• j is 1, 2, or 3;
• and
• the polyamic acid or the derivative thereof having a photoisomerization structure is polyamic acid or a derivative thereof obtained by reacting tetracarboxylic dianhydride represented by AN-4-17 and at least one of a tetracarboxylic dianhydride or a diamine having a photoisomerization structure selected from Formulae (I) to (VII):
• wherein, in Formula (AN-4-17), m is an integer of 4 to 12,
• R2—C≡C—R3 (I)
• R2—C≡C—C≡C—R3 (II)
• R2—C≡C—CH═CH—R3 (III)
• R2—C≡C—R4—C≡C—R3 (IV)
• R2—C≡C—R4—CH═CH—R3 (V)
• R2—CH═CH—R3 (VI)
• R2—N═N—R3 (VII)
• wherein, in Formulae (I) to (VII), R2 and R3 are independently a monovalent organic group having —NH2 or —CO—O—CO—, and R4 is a divalent organic group including an aromatic ring.