Anisotropic light-scattering film

摘要

Use in made of a film (anisotropic light-scattering film) having a light scattering characteristic F(θ) satisfying the following relation relevant to the relation between the angle of light scatteringθand the intensity of scattered light F over a range ofθ= 4 to 30 DEG : Fy(θ)/Fx(θ)>5 where Fx(θ) represents the scattering characteristic in the direction of the X-axis of the film 10 and Fy(θ) represents the scattering characteristic in the direction of the Y-axis of the film 10. This film 10 is composed of a continuous phase and a particulate dispersed phase 11, the difference in the index of refraction between which is not less than 0.001, with the mean aspect ratio of dispersed phase particles being not less than 1 and the direction of the major axis of each dispersed phase particle being oriented in the direction of the X-axis of the film 10. The continuous phase can be composed of a crystalline resin and the dispersed phase can be composed of a noncrystalline resin. The film may contain a compatibilizing agent. The anisotropic light-scattering film assures a uniform surface emission with close tolerances and without compromise in luminance.