JP2004233972A5 - - Google Patents

Claims (8)

X-axis direction in which the refractive index of the film plane is maximum, Y-axis and a direction perpendicular to the X-axis, the thickness direction of the film as Z-axis, the refractive indices of the respective axial nx _1, ny _1, nz _{If 1
Nz = (nx 1 -nz 1)} / Nz coefficient expressed by (nx ₁ -ny ₁₎ is,
An optical film (1) whose three-dimensional refractive index is controlled so as to satisfy Nz ≦ 0.9;
Is formed of a material showing optically negative uniaxial property, and an optical film in which the material is oriented inclined (2),
X-axis direction in which the refractive index of the film plane is maximum, Y-axis and a direction perpendicular to the X-axis, the thickness direction of the film as Z-axis, the refractive indices of the respective axial nx _3, ny _3, nz If _{the 3} and was,
An optical film (3) that satisfies nx ₃ > ny ₃ ≈nz ₃ and exhibits optically positive uniaxiality, and is laminated.   The laminated optical film according to claim 1, wherein the Nz coefficient of the optical film (1) having a controlled three-dimensional refractive index satisfies Nz≤0.3.   The laminated optical film according to claim 1 or 2, wherein the optically negative uniaxial material forming the optical film (2) is a discotic liquid crystal compound.   The optically negative uniaxial material forming the optical film (2) has an inclination angle of 5 ° to 50 ° between the average optical axis and the normal direction of the optical film (2). The laminated optical film according to claim 1, wherein the laminated optical film is oriented. An optical film having a controlled three-dimensional refractive index between an optical film (3) exhibiting optically positive uniaxiality and an optical film (2) obtained by obliquely orienting a material exhibiting optically negative uniaxiality The laminated optical film according to any one of claims 1 to 4, wherein a film (1) is disposed. The laminated optical film in any one of Claims 1-5 , and the polarizing plate are laminated | stacked, The elliptically polarizing plate characterized by the above-mentioned. The polarizing plate is laminated | stacked on the optical film (3) side of the laminated optical film in any one of Claims 1-5, The elliptically polarizing plate of Claim 6 characterized by the above-mentioned. The image display apparatus characterized by laminated optical film according to any one of claims 1 to 5 or claim 6 or 7 elliptically polarizing plate according are laminated.