Laminated phase retarder film and a liquid crystal display using the same
AssigneeSumitomo Chemical Company, Limited
InventorAkiko Shimizu
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Abstract
The objective of the present invention is to provide a laminated phase retarder film that is superior in evenness, exhibits a biaxial optical property as a whole, and makes it possible to set the biaxial optical property over a wide range. This object is achieved by a laminated phase retarder film comprising a transparent resin film as a substrate and at least one coat layer having a refractive-index anisotropy laminated on at least one surface of the substrate, wherein a in-plane retardation value (R0) is not less than 20 nm, a retardation value (R′) in the film-thickness direction, which is calculated from a retardation value (R40) measured by inclining by 40 degrees around the slow axis of the film and the in-plane retardation value (R0), is greater than 40 nm.
Claims7
A laminated phase retarder film comprising a transparent resin film as a substrate and at least one coat layer having a refractive-index anisotropy laminated on at least one surface of the substrate, wherein an in-plane retardation value (R0) is more than 50 nm, a retardation value (R′) in the film-thickness direction, which is calculated from a retardation value (R40) measured by inclining by 40 degrees around the slow axis of the film and the in-plane retardation value (R0), is greater than 40 nm, and
- wherein the coat layer having a refractive-index anisotropy comprises at least one kind of an organic clay compound which can be dispersed in an organic solvent.
Dependencies are inferred from the claim text.