Photoalignment materials and liquid crystal display device and method for fabricating the same with said materials

A photoalignment material comprising polyamideimide illustrated in Chemical Formula 2 and a polyamideimide precursor illustrated in Chemical Formula 3, wherein a photosensitive diamine derivative compound with a side chain is connected to a main chain, respectively;

• 8
• where subscripts a and b are integral numbers from 0 to 4;
• components X1 and X2 are selected from a group comprising —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components R1 and R2 are functional groups selected from a group comprising hydrogen, halogen, cyano, nitro, amino, alkyl (C1-C100), haloalkyl, cyanoalkyl, nitroalkyl, hydroxyalkyl, cyanohaloalkyl, nitrohaloalkyl, cyanonitroalkyl, hydroxyhaloalkyl, cyanohydroxyalkyl, hydroxynitroalkyl, aryl (C6-C100), alkylaryl, haloaryl, haloalkylaryl, nitroaryl, nitroalkylaryl, cyanoaryl, cyanoalkylaryl, nitroaryl, nitroalkylaryl, hydroxyaryl, hydroxyalkylaryl, cyanohaloaryl, and cyanohaloalkylaryl;
• and Ar is selected from the group comprising:
• 9

A liquid crystal display device, comprising:

• a first substrate;
• a second substrate;
• a liquid crystal layer between the first substrate and the second substrate;
• and
• an alignment film having a photoalignment material on the first substrate,
• wherein the photoalignment material has Chemical Formula 1;
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• where subscripts a and b are integral numbers from 0 to 4;
• components X1 and X2 are selected from a group comprising —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components R1 and R2 are functional groups selected from a group comprising hydrogen, halogen, cyano, nitro, amino, alkyl (C1-C100), haloalkyl, cyanoalkyl, nitroalkyl, hydroxyalkyl, cyanohaloalkyl, nitrohaloalkyl, cyanonitroalkyl, hydroxyhaloalkyl, cyanohydroxyalkyl, hydroxynitroalkyl, aryl (C6-C100), alkylaryl, haloaryl, haloalkylaryl, nitroaryl, nitroalkylaryl, cyanoaryl, cyanoalkylaryl, nitroaryl, nitroalkylaryl, hydroxyaryl, hydroxyalkylaryl, cyanohaloaryl, and cyanohaloalkylaryl;
• and Ar is selected from the group comprising:
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A liquid crystal display device, comprising:

• a first substrate;
• a second substrate;
• a liquid crystal layer between the first substrate and the second substrate;
• and
• an alignment film having a photoalignment material on the first substrate,
• wherein the photoalignment material has a Chemical Formula;
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• where subscripts a and b are integral numbers from 0 to 4;
• components X1 and X2 are selected from a group comprising —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components R1 and R2 are functional groups selected from a group comprising hydrogen, halogen, cyano, nitro, amino, alkyl (C1-C100), haloalkyl, cyanoalkyl, nitroalkyl, hydroxyalkyl, cyanohaloalkyl, nitrohaloalkyl, cyanonitroalkyl, hydroxyhaloalkyl, cyanohydroxyalkyl, hydroxynitroalkyl, aryl (C6-C100), alkylaryl, haloaryl, haloalkylaryl, nitroaryl, nitroalkylaryl, cyanoaryl, cyanoalkylaryl, nitroaryl, nitroalkylaryl, hydroxyaryl, hydroxyalkylaryl, cyanohaloaryl, and cyanohaloalkylaryl;
• and Ar is selected from the group comprising:
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A method for fabricating a liquid crystal display device, comprising:

• preparing a first substrate and a second substrate;
• forming an alignment film having a photoalignment material illustrated in Chemical Formula 1 on the first substrate;
• and
• locating a liquid crystal layer between the first substrate and the second substrate,
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• where subscripts a and b are integral numbers from 0 to 4;
• components X1 and X2 are selected from a group comprising —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components R1 and R2 are functional groups selected from a group comprising hydrogen, halogen, cyano, nitro, amino, alkyl (C1-C100), haloalkyl, cyanoalkyl, nitroalkyl, hydroxyalkyl, cyanohaloalkyl, nitrohaloalkyl, cyanonitroalkyl, hydroxyhaloalkyl, cyanohydroxyalkyl, hydroxynitroalkyl, aryl (C6-C100), alkylaryl, haloaryl, haloalkylaryl, nitroaryl, nitroalkylaryl, cyanoaryl, cyanoalkylaryl, nitroaryl, nitroalkylaryl, hydroxyaryl, hydroxyalkylaryl, cyanohaloaryl, and cyanohaloalkylaryl;
• and Ar is selected from the group comprising:
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A method for fabricating a liquid crystal display device comprising:

• preparing a first substrate and a second substrate;
• forming an alignment film having a photoalignment material as illustrated in Chemical Formula 2 on the first substrate;
• and
• interposing a liquid crystal between the first substrate and the second substrate,
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• where subscripts a and b are integral numbers from 0 to 4;
• components X1 and X2 are selected from a group comprising —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components R1 and R2 are functional groups selected from the group comprising hydrogen, halogen, cyano, nitro, amino, alkyl (C1-C100), haloalkyl, cyanoalkyl, nitroalkyl, hydroxyalkyl, cyanohaloalkyl, nitrohaloalkyl, cyanonitroalkyl, hydroxyhaloalkyl, cyanohydroxyalkyl, hydroxynitroalkyl, aryl (C6-C100), alkylaryl, haloaryl, haloalkylaryl, nitroaryl, nitroalkylaryl, cyanoaryl, cyanoalkylaryl, nitroaryl, nitroalkylaryl, hydroxyaryl, hydroxyalkylaryl, cyanohaloaryl, and cyanohaloalkylaryl;
• and, Ar is selected from the group comprising:
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