| 摘要 |
Disclosed is a thin and lightweight birefringent film which has a refractive index ellipsoid satisfying the relation of nx >= nz > ny, while having a desired Nz coefficient. Specifically disclosed is a birefringent film which contains a first acenaphto[1,2-b]quinoxaline derivative having lyotropic liquid crystallinity and a second acenaphto[1,2-b]quinoxaline derivative having lyotropic liquid crystallinity, while having a refractive index ellipsoid satisfying the relation of nx >= nz > ny. This birefringent film preferably has an Nz coefficient of 0-0.5.
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