Optical film of cellulose ester and cellulose ether for vertical alignment liquid crystal displays
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United States of America Patent
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Dec 20, 2016
Grant Date -
Feb 4, 2016
app pub date -
Feb 7, 2014
filing date -
Mar 7, 2013
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Abstract
The optical film contains cellulose ester and cellulose ether. The cellulose ester satisfies formulae 2.0≦X+Y≦3.0 and 0≦Y≦1.6. X is an acetyl group, and Y is a propionyl group and/or a butyryl group. The mass ratio of the cellulose ester to the cellulose ether is 99.0:1.0 to 55.0:45.0. Retardations Ro and Rt of the film are 20 to 130 nm and 100 to 300 nm, respectively, and expressed as Ro=(nx−ny)×d and Rt={(nx+ny)/(2−nz)}×d. nx is an in-plane refractive index of a film in a slow axis direction, ny is an in-plane refractive index of a film in a fast axis direction, nz is a refractive index of a film in a thickness direction, and d is a thickness of a film.
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