| 摘要 |
An optical film includes at least one kind of humidity dependency improver that improves DeltaRe, wherein the optical film has a ratio of Re/Rth which is larger as a wavelength is longer in the visible wavelength region; and Re which is larger as a wavelength is longer in the visible wavelength region, wherein Re represents an in-plane retardation (unit: nm) of the optical film; Rth represents a retardation (unit: nm) in a thickness direction of the optical film; and DeltaRe represents a humidity dependency of Re defined by the following formula (1): <?in-line-formulae description="In-line Formulae" end="lead"?>DeltaRe=|Re(550)10%RH-Re(550)80%RH|,: Formula (1)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein Re(550)10%RH represents Re at a wavelength of 550 nm, at a temperature of 25° C. and at a relative humidity of 10%; and Re(550)80%RH represents Re at a wavelength of 550 nm, at a temperature of 25° C. and at a relative humidity of 80%.
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