Optical film, circularly polarizing plate, and image display device
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United States of America Patent
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Nov 22, 2016
Grant Date -
Sep 3, 2015
app pub date -
Feb 19, 2013
filing date -
Feb 22, 2012
priority date (Note) -
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Abstract
A optical film includes a thermoplastic resin and a compound wherein: (1) the absorption spectrum of said compound in solution has at least two absorption maxima in the 200-350 nm wavelength range; (2) letting λmax1 represent the wavelength of a first absorption maximum (one of the aforementioned absorption maxima) and letting λmax2 represent the wavelength of a second absorption maximum (another of the aforementioned absorption maxima) at a shorter wavelength than the first absorption maximum, (λmax1−λmax2) is at least 20 nm; (3) the aspect ratio of the molecules of the compound is at least 1.70; (4) each molecule of the compound has a non-aromatic hydrocarbon ring, a non-aromatic heterocycle, or an aromatic heterocycle; (5) the in-plane-retardation increase sensitivity of the compound is at least 0.1; 110 nm≦R0(550)≦170 nm; 0.72≦R0(450)/R0(550)≦0.96; and 0.83≦R0(550)/R0(650)≦0.97.
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