Optical compensation film with hybrid arrangement of nematic liquid crystals consisting of connected mesogens with an angle and the method of manufacturing the same

An optical compensation film, comprising:

• a substrate layer;
• an aligning layer disposed on the top of the substrate layer;
• and
• a coating layer with hybrid alignment, disposed on the top of the aligning layer,
• wherein the coating layer with hybrid alignment in which the alignment of a nematic liquid crystal compound including a compound represented by Chemical Formula 1 varies gradually along the thickness direction from the surface of the aligning layer:
• [A]m-B-[A′]n [Chemical Formula 1]
• wherein m and n independently represent a natural number ranging from 1 to 12;
• A and A′ are the same or different and each represents a discotic type mesogen or rod-like mesogen, wherein A′ and A′ or A and A are linked to each other via direct bonding between the two mesogens or by way of a spacer;
• wherein A or A′ is a compound represented by Chemical Formula 2:
• wherein R1 through R4 independently represent (C1-C14)alkyl, (C1-C14)alkoxy, (C1-C14)alkylcarbonyl, (C6-C20)aryl, (C6-C20)arylcarbonyl, (C1-C14)alkoxycarbonyl, (C6-C20)aryloxycarbonyl, carbamoyl or sulfamoyl;
• wherein the alkyl, the alkyl at the alkylcarbonyl, the alkoxy, and the alkoxy at the alkoxycarbonyl of R1 through R4 may include a linear or branched, saturated or unsaturated bond, and the alkyl, aryl, alkanoyl, alkenoyl, alkynoyl, aryloyl, alkoxycarbonyl, aryloxycarbonyl, carbamoyl or sulfamoyl of R1 through R4 may be further substituted with at least one substituent selected from the group consisting of halogen, cyano and hydroxyl;
• and
• B is a functional group maintaining a geometrically constant binding angle.

A method for producing an optical compensation film, comprising:

• forming an aligning layer on a substrate film;
• coating a liquid crystal solution containing a nematic liquid crystal compound including a compound of Chemical Formula 1 on the top of the aligning layer to form a film with a hybrid liquid crystal alignment structure;
• and
• irradiating the resultant film with ultraviolet rays at 50-150° C. to immobilize the hybrid liquid crystal alignment structure:
• [A]m-B-[A′]n [Chemical Formula 1]
• wherein m and n independently represent a natural number ranging from 1 to 12;
• A and A′ are the same or different and each represents a discotic type mesogen or rod-like mesogen;
• A or A′ is a compound represented by Chemical Formula 2:
• wherein R1 through R4 independently represent (C1-C14)alkyl, (C1-C14)alkoxy, (C1-C14)alkylcarbonyl, (C6-C20)aryl, (C6-C20)arylcarbonyl, (C1-C14)alkoxycarbonyl, (C6-C20)aryloxycarbonyl, carbamoyl or sulfamoyl;
• wherein the alkyl, the alkyl at the alkylcarbonyl, the alkoxy, and the alkoxy at the alkoxycarbonyl of R1 through R4 may include a linear or branched, saturated or unsaturated bond, and the alkyl, aryl, alkanoyl, alkenoyl, alkynoyl, aryloyl, alkoxycarbonyl, aryloxycarbonyl, carbamoyl or sulfamoyl of R1 through R4 may be further substituted with at least one substituent selected from the group consisting of halogen, cyano and hydroxyl;
• and
• B is a functional group maintaining a geometrically constant binding angle.