Disclosed is an optical film having low wavelength dispersibility which is obtained by stretching a film formed of a fluorine-containing cyclic olefin polymer including at least one selected from a repeating structural unit represented by the formula described below, wherein a phase difference at a wavelength of 550 nm is greater than or equal to 50 nm, wavelength dispersibility represented by a ratio Re (400 nm)/Re (550 nm) of a phase difference Re (400 nm) at a wavelength of 400 nm to a phase difference Re (550 nm) at a wavelength of 550 nm is 1.00 to 1.05, wavelength dispersibility represented by a ratio Re (400 nm)/Re (800 nm) of a phase difference Re (400 nm) at a wavelength of 400 nm to a phase difference Re (800 nm) at a wavelength of 800 nm is 1.00 to 1.05, and total light transmittance is greater than or equal to 92%.
本发明公开了一种具有低波长色散性的光学薄膜,该光学薄膜是通过拉伸由含
氟环状烯烃聚合物形成的薄膜而获得的,该聚合物包括至少一种选自下式所代表的重复结构单元、其中,波长 550 nm 处的相位差大于或等于 50 nm,波长色散性由波长 400 nm 处的相位差 Re (400 nm)/Re (550 nm)与波长 550 nm 处的相位差 Re (550 nm)之比 Re (400 nm)/Re (550 nm)1.00 至 1.05,波长色散性由波长为 400 纳米时的相位差 Re (400 纳米)与波长为 800 纳米时的相位差 Re (800 纳米)之比 Re (400 纳米)/Re (800 纳米)表示,为 1.00 至 1.05,总透光率大于或等于 92%。