| 摘要 |
An optical film is provided and has retardations satisfying relations (1) to (3): 0≦̸Re(550)≦̸10;  (1) −25≦̸Rth(550)≦̸25; and  (2) |I|+|II|+|III|+|IV|>0.5 (nm),  (3) with definitions: I=Re(450)-Re(550); II=Re(650)-Re(550); III=Rth(450)-Rth(550); and IV=Rth(650)-Rth(550), wherein Re(450), Re(550) and Re(650) are in-plane retardations measured with lights of wavelength of 450, 550 and 650 nm, respectively; and Rth(450), Rth(550) and Rth(650) are retardations in a thickness direction of the optical film, which are measured with lights of wavelength of 450, 550 and 650 nm, respectively.
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