Provided are an optically anisotropic film which has excellent moisture-heat resistance and can have a reduction in the thickness, an optical film, a polarizing plate, and an image display device. The optically anisotropic film is obtained by polymerizing a polymerizable liquid crystal composition, in which the polymerizable liquid crystal composition contains a polymerizable liquid crystal compound represented by Formula (1): L1-SP1-(E3-A1)m-E1-G1-D1-Ar1-D2-G2-E2-(A2-E4)n-SP2-L2 and a polymerizable liquid crystal compound represented by Formula (2): L1-SP1-(E3-A1)m-E1-G1-D1-Ar2-D2-G2-E2-(A2-E4)n-SP2-L2, and the optically anisotropic film satisfies Formula (3): Re(450)/Re(550)<1 or Formula (4): Rth(450)/Rth(550)<1, and has a degree of alignment as measured by Raman spectroscopy of 0.4 or more.
本发明提供了一种光学各向异性薄膜、一种光学薄膜、一种偏光板和一种图像显示装置,该光学各向异性薄膜具有优异的耐湿热性,并能减小厚度。该光学各向异性薄膜是通过聚合可聚合液晶组合物获得的,其中可聚合液晶组合物含有由式(1)表示的可聚合液晶化合物:L1-
SP1-(E3-A1)m-E1-G1-D1-Ar1-D2-G2-E2-(A2-E4)n-
SP2-
L2 和由式(2)表示的可聚合液晶化合物:L1-
SP1-(E3-A1)m-E1-G1-D1-Ar2-D2-G2-E2-(A2-E4)n-
SP2-
L2,且光学各向异性薄膜满足式(3):Re(450)/Re(550)<1或式(4)Rth(450)/Rth(550)<1,并且拉曼光谱测量的对准度为 0.4 或以上。