Photo-alignment materials for liquid crystal alignment film

A photo-alignment material comprising a repeating unit represented by the following formula 1, or a repeating unit represented by the following formula 1 and at least one repeating unit selected from the group consisting of structures represented by the following formula 2, wherein the mole ratio of repeating units having at least one photo-reactive group to repeating units not having a photo-reactive group is from about 2:8 to about 10:0:

• 42
• in which X is a hydrogen atom, fluorine atom, chlorine atom, or C1˜14 linear or branched alkyl group;
• Y is an oxygen atom or C2˜14 alkylene group;
• and R is a functional group having a structure represented by the following formula 3:
• —(R1)k—(R2)l—(R3) (3)
• in which R1 is selected from the group consisting of functional groups represented by the following formula 4;
• R2 is selected from the group consisting of functional groups represented by the following formulas 5 and 6;
• R3 is selected from the group consisting of functional groups represented by the following formula 7;
• k is an integer of from 0 to 3;
• l is an integer of from 0 to 5;
• and if there exist a plurality of R1 or R2, each R1 or R2 may be same or different:
• 43
• in which n is an integer of from 0 to 10,
• 44
• 45
• in which X in the functional groups represented by formula (7) is a hydrogen atom, fluorine atom, chlorine atom, C1˜13 alkyl or alkoxy group, or —(OCH2)pCH3 in which p is an integer of from 0 to 12, and m is an integer of from 0 to 18.