Optical film, elliptically polarizing plate, circularly...

G - Physics – 02 – B

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G02B 5/30 (2006.01) G02F 1/1335 (2006.01) G02F 1/13363 (2006.01) C08F 20/30 (2006.01) C08F 20/36 (2006.01) C08F 230/08 (2006.01)

Patent

CA 2592415

In an optical film (10), a plurality of optical anisotropic layers (13) are stacked. In the optical anisotropic layer, a photo-alignment layer ((A)11) having liquid crystal alignment capability generated by light irradiation, and a polymer layer ((B)12), which contains a liquid crystal compound having a polymer group and is polymerized by being aligned by the photo-alignment layer ((A)11), are covalently-linked. The optical anisotropic layer (13) may be an optical anisotropic layer (13) having a function of a 1/2 wavelength plate or an optical anisotropic layer (13) having a function of a 1/4 wavelength plate.

Selon l~invention on empile dans un film optique (10) une pluralité de couches anisotropes optiques (13). Dans la couche anisotrope optique, une couche de photo-alignement ((A)11) ayant une capacité d~alignement de cristaux liquides générée par irradiation de lumière et une couche polymère ((B)12), contenant un composé à cristaux liquides ayant un groupe polymère et se trouvant polymérisée par alignement par la couche de photo-alignement ((A)11), sont liées par covalence. La couche anisotrope optique (13) peut être une couche anisotrope optique (13) ayant une fonction de plaque d~une demie longueur d~onde ou bien une couche anisotrope optique (13) ayant une fonction de plaque d~un quart de longueur d~onde.

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