RETARDATION FILM, LUMINANCE-IMPROVING FILM, POLARIZING PLATE, METHOD FOR PRODUCING RETARDATION FILM, AND LIQUID CRYSTAL DISPLAY

WIPO Patent Application WO/2008/010497

A1

Disclosed is a retardation film which enables to obtain a polarizing plate having excellent durability and view angle compensation function by being used as a polarizing plate protection film. Specifically disclosed is a retardation film comprising an optically anisotropic film wherein the refractive index nx in the in-plane slow axis direction and the refractive index ny in the in-plane fast axis direction satisfy the following relation of nx > ny, and a retardation layer formed on the optically anisotropic film and containing a liquid crystal material, in which retardation layer the refractive indexes nx and ny in arbitrary x and y directions perpendicular to each other in the in-plane direction and the refractive index nz in the thickness direction satisfy the following relation of nx ≤ ny < nz. This retardation film is characterized in that a transparent substrate composed of a cellulose derivative is used for the optically anisotropic film.

NAKAMURA RUNA (JP)
NAKAGAWA HIROKI (JP)
KURODA TAKASHI (JP)
INOMATA YUYA (JP)
FUKUDA MASANORI (JP)

PCT/JP2007/064119

January 24, 2008

July 17, 2007

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DAINIPPON PRINTING CO LTD (JP)
NAKAMURA RUNA (JP)
NAKAGAWA HIROKI (JP)
KURODA TAKASHI (JP)
INOMATA YUYA (JP)
FUKUDA MASANORI (JP)

G02B5/30; B32B7/02; B32B23/04; B32B27/00; B32B27/32; G02F1/13363

JP2004004150A	2004-01-08
JPH0713022A	1995-01-17
JP2005070098A	2005-03-17
JP2003121853A	2003-04-23
JP3132122B2	2001-02-05
JP2002174725A	2002-06-21

YAMASHITA, Akihiko et al. (3rd Floor Oak Building Kyobashi,16-10, Kyobashi 1-chome,Chuou-k, _Tokyo 31, JP)

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