| 摘要 |
PURPOSE: A method of compensating phase shift and brightness according to viewing angle of reflective polarizer improves the phase shift and the brightness according to the viewing angle of a reflective cholesteric liquid crystal polarizer using a liquid crystal film homeotropically aligned by using an alignment layer. CONSTITUTION: An optical alignment layer has a carbon-carbon triple bond and a carbon-carbon double bond as a photoreaction-functional group. A homeotropically-aligned film is manufactured by fixing the alignment state through the light irradiation after a thermosetting nematic liquid crystal is homeotropically aligned by using the alignment layer. Exactly, an optical alignment material is dissolved in an organic solvent of MEK, THF and toluene then this solution is thinly coated on a plastic of PET, PC and TAC by using a roll coating method. The coated film passes through a dryer to remove the solvent, then it is irradiated by using a UV irradiator or is rewound without irradiating with UV ray. A hypergolic nematic liquid crystal is irradiated with the UV ray after it is coated on the film and dried, Therefore, the homeotropically-aligned film is formed by fixing the homeotropically aligned state after the curing process. |
