| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a retardation film and a method for manufacturing the film, by which a retardation film satisfying Nz<1 is inexpensively manufactured by stretching a liquid crystal layer having fixed homeotropic alignment, the three-dimensional refractive index distribution of the retardation film is accurately controlled, and problems such as cracks are prevented during stretching a film. <P>SOLUTION: The retardation film is obtained by subjecting a liquid crystal composition showing positive uniaxial property to homeotropic alignment in a liquid crystal state, and then stretching the liquid crystal layer with the homeotropic alignment, as the alignment fixed. The film has a principal refractive index nx1 in the plane of the stretched liquid crystal layer, a refractive index ny1 in a direction orthogonal to nx1 (where nx1≥ny1), a principal refractive index nz1 in the thickness direction, thickness d1, in-plane retardation Re1 and retardation Rth1 in the thickness direction, wherein Nz1 represented by Nz1=Rth1/Re1+0.5 satisfies Nz1<1.0. <P>COPYRIGHT: (C)2010,JPO&INPIT |
