Patent ID: 7638205

Claim:
An optical laminate film comprising: a layer (A) comprising a material having a negative intrinsic birefringence value as a primary component; and a layer (B) comprising a transparent resin as a primary component which is laminated to at least one side of the layer (A); wherein the following conditions are met; (a) n z >(n x +n y )/2 (b) 0≦ dispersion of retardation Re≦10 nm, wherein retardation Re is represented by the formula: [|n x −n y |×D] where D represents thickness (μm) of the laminated film, n z represents a refractive index in the thickness direction, and n x and n y each represent a refractive index, respectively in two directions orthogonal to each other and both of which are perpendicular to the thickness direction, all of the refractive indices being measured using light with wavelength of 550 nm, wherein the material having a negative intrinsic birefringence value in the layer (A) has a glass transition temperature (Tg A ) higher than glass transition temperature (Tg B ) of the transparent resin in the layer (B).