Photoalignment materials and liquid crystal display fabricated with such photoalignment materials

A photoalignment material comprising a diamine compound with a side branch and in accord with Chemical Formula 2;

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• where subscripts y and z are integral numbers from 0 to 4;
• components A2 and A3 are selected from a group consisting of —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components B2 and B3 are functional groups selected from a group consisting of 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.

A photoalignment material, wherein a diamine with a side branch in a main chain is a polyamide according to Chemical Formula 3;

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• where subscript x is an integral number from 0 to 4;
• component A1 is selected from a group consisting of —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—, respectively;
• and component B1 is a functional group selected from a group consisting of 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.

A photoalignment material, wherein a diamine with a side branch in a main chain is a polyamide according to Chemical Formula 4;

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• where subscripts y and z are integral numbers from 0 to 4;
• components A2 and A3 are selected from a group consisting of —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components B2 and B3 are functional groups selected from a group consisting of 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.

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 on the first substrate and having a photoalignment material according to the formula;
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• where subscript x is an integral number from 0 to 4;
• component A1 is selected from a group consisting of —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and component B1 is a functional group selected from a group consisting of 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.

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 on the first substrate and including a photoalignment material according to the formula;
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• where subscripts y and z are integral numbers from 0 to 4;
• components A2 and A3 are selected from a group consisting of —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and, components B2 and B3 are functional groups selected from a group consisting of 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.

A method for fabricating a liquid crystal display device, comprising:

• forming an alignment film having an photoalignment material according to Chemical Formula 3 on a first substrate;
• and
• forming a liquid crystal layer between the first substrate and a second substrate,
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• where subscript x is an integral number from 0 to 4;
• component Al is selected from a group consisting of —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and component B1 is a functional group selected from a group consisting of 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.

A method for fabricating a liquid crystal display device comprising:

• forming an alignment film having a photoalignment material of Chemical Formula 4 on a first substrate;
• and
• locating a liquid crystal layer between the first substrate and a second substrate,
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• where substrate y and z are integral numbers from 0 to 4;
• components A2 and A3 are selected from a group consisting of —CH2—, —CH═, —O—, —COO—, —OOC—, —NHCO—, and —CONH—;
• and components B2 and B3 are functional groups selected from a group consisting of 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.