Patent ID: 8823909

Claim:
An optical film having retardations satisfying relations (1) to (3): 0≦Re(550)≦5; (1) −15≦Rth(550)≦15; 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, and wherein I, II, III and IV satisfy relations (4-A) to (7-A): −50≦I≦0; (4-A) 0≦II≦50; (5-A) −50≦III<0; and (6-A) 0<IV≦50, (7-A) wherein a material for forming the optical film comprises at least one resin selected from an acrylic polymer, a styrenic polymer, and cellulose acylate, wherein the optical film has a spectral transmittance, at a wavelength of 380 nm, of 45 to 95%, and wherein −15≦Rth(550)≦0.