Liquid Crystal Alignment Agent, Liquid Crystal Alignment Film Using the Same, and Liquid Crystal Display Device Including the Liquid Crystal Alignment Film

A liquid crystal alignment agent, comprising

• a polymer including polyamic acid including a repeating unit represented by the following Chemical Formula 1, polyimide including a repeating unit represented by the following Chemical Formula 2, or a combination thereof:
• wherein, in Chemical Formulae 1 and 2,
• X1 and X2 are the same or different and are each independently a tetravalent organic group derived from alicyclic acid dianhydride or aromatic acid dianhydride, and
• Y1 and Y2 are the same or different and are each independently a divalent organic group derived from diamine, wherein the diamine includes a photodiamine represented by the following Chemical Formula 3 and a functional diamine represented by the following Chemical Formula 5,
• wherein, in Chemical Formula 3,
• R1, R3, and R6 are the same or different and are each independently hydrogen or substituted or unsubstituted C1 to C10 alkyl,
• R2 and R4 are the same or different and are each independently a single bond, substituted or unsubstituted C1 to C10 alkylene, —O—, —CO—O—, —CO—NH—, —NH—CO—, or —O—CO—,
• R5 is substituted or unsubstituted C1 to C30 alkyl, substituted or unsubstituted C1 to C30 alkoxy, or a substituted or unsubstituted C2 to C30 ether group,
• n1 is an integer ranging from 0 to 3, n3 and n6 are the same or different and are each independently integers ranging from 0 to 4, and
• m is an integer ranging from 1 to 5,
• wherein, in Chemical Formula 5,
• each R7 is independently hydrogen, substituted or unsubstituted C1 to C20 alkyl, substituted or unsubstituted C6 to C30 aryl, or substituted or unsubstituted C2 to C30 heteroaryl,
• R8 is a single bond, —O—, —S—, —NH—, —CO—, —CO—O—, —O—CO—, —CO—NH—, or —NH—CO—,
• R9 is hydrogen, a substituted or unsubstituted C1 to C40 aliphatic organic group, a substituted or unsubstituted C2 to C40 aromatic organic group, or a substituted or unsubstituted C3 to C40 alicyclic organic group, and
• n7 is an integer ranging from 0 to 3.