Laminated optical film, and polarizing plate and liquid crystal display including the same

摘要

A laminated optical film which exhibit a high front contrast ratio and even brightness, improve viewing angle characteristics of a liquid crystal display of a horizontal alignment mode, and have high durability.;A laminated optical film comprising: a B layer; and a C layer, wherein the B layer satisfies the following three formulae (Ib) to (IIIb), the C layer satisfies the following two formulae (Ic) and (IIc), and the absolute value |ΔSP value| of a difference in SP value between the primary components of the B and C layers is not more than 1.5, the SP value being determined by Hoy's method.
1.0≦Nz≦3.0;  (Ib):70 nm≦Re (550); and  (IIb):0 nm≦Rth (550)≦200 nm,  (IIIb):Re (550)≦10 nm; and  (Ic):−200 nm≦Rth (550)≦−50 nm  (IIc):

主权项

1. A laminated optical film comprising:
a B layer; and a C layer, wherein the B layer satisfies the following three formulae (Ib) to (IIIb):
1.0≦Nz≦3.0;   (Ib):70 nm≦Re(550); and  (IIb):0 nm≦Rth(550)≦200 nm,   (IIIb): the C layer satisfies the following two formulae (Ic) and (IIc):
Re(550)≦10 nm; and   (Ic):−200 nm≦Rth(550)≦−50 nm, and absolute value |ΔSP value | of a difference in SP value between primary components of the B and C layers is not more than 1.5, where:   (IIc): Re(550) and Rth(550) are retardation (nm) in plane and retardation (nm) along the thickness direction, respectively, at a wavelength of 550 nm, Nz =(nx-nz)/(nx-ny), wherein nx represents a refractive index in the in-plane slow axis direction; ny represents a refractive index in the in-plane direction perpendicular to nx; and nz represents a refractive index in the direction perpendicular to nx and ny, the SP value refers to the value of the solubility parameter determined by Hoy's method, and the primary component indicates a component of the highest content.