Patent ID: 9599833
Date: 2017-03-21
CPC Classifications: B01J,G02B

Claim:
1. An optical device comprising an optical layer and an alignment film coming in contact with the optical layer, wherein the optical layer comprises a shift region, of which optical axes or light absorption axes are changed according to one direction, wherein an interface between regions, of which optical axes or light absorption axes are different from each other in the shift region, are not observed and no domain is observed in the optical layer, wherein the alignment film comprises an alignment compound having reversibility and the alignment compound has characteristics that an orientation direction determined by one alignment treatment is affected by another additional alignment treatment, and wherein the shift region has a rotation angle (w) of 40° or more, as measured according to the following Equation 4: wherein the “φ” represents the rotation angle (unit: °), the “V” represents the average rate (unit: °/mm) of change, and the “L” represents a length (unit: mm) of the shift region.