Optical film, elliptically polarizing plate, circularly polarizing plate, liquid crystal display element, and method of producing optical film
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United States of America Patent
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Nov 13, 2012
Grant Date -
Feb 14, 2008
app pub date -
Dec 27, 2005
filing date -
Dec 27, 2004
priority date (Note) -
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Abstract
An optical film 10 of the present invention includes a plurality of optically anisotropic layers 13 which are laminated, wherein the optically anisotropic layer including: a photoalignment layer (A) 11, in which a liquid crystal aligning capability has been generated by means of photoirradiation; and a polymer layer (B) 12, which contains a liquid crystal compound that has a polymerizable group, and which is obtained by polymerization in a state where it has been aligned by the photoalignment layer (A) 11, wherein the photoalignment layer (A) 11 and the polymer layer (B) 12 are bonded by covalent bonding. The plurality of optically anisotropic layers 13 may be an optically anisotropic layer 13 having a function of a one-half wavelength plate, and an optically anisotropic layer 13 having a function of a one-quarter wavelength plate.
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