| 摘要 |
This invention provides a brightness enhancement film having a λ/4 plate and a reflective polarizer, wherein the λ/4 plate includes a resin layer I, the resin layer I includes a polymer having a negative intrinsic birefringence value, the polymer includes a repeating unit derived from an acid anhydride monomer, the polymer includes 5-50% by weight of the repeating unit derived from the acid anhydride monomer, the reflective polarizer includes a light reflection layer formed by fixing a cholesteric liquid crystalline phase, and in which the light reflection layer is a laminated layer with an alignment layer in direct contact with the λ/4 plate interposed therebetween. The invention further provides a liquid crystal display device using the brightness enhancement film. When installed in the liquid crystal display device, the brightness enhancement film yields a high brightness improvement rate and is able to suppress diagonal color change. |
