OPTICAL COMPENSATING POLARIZING PLATE FOR IN-PLANE SWITCHING MODE LIQUID CRYSTAL DISPLAY DEVICE, IMAGE DISPLAY DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical compensating polarizing plate for improving display contrast and viewing field angle characteristics of display colors without decreasing front contrast when applied to an in-plane switching mode liquid crystal display device.;SOLUTION: In the optical compensating polarizing plate for the in-plane switching mode liquid crystal display device, an optical compensating layer is laminated on one side of a polarizing plate which is made by laminating transparent protective films on both sides of a polarizer. At least the transparent protective film of an optical compensating layer side is a cellulose acylate film, whose front retardation value Re and retardation value Rth in a film thickness direction satisfy a formula (I): |Re|≤10, formula (II): |Rth|≤25, and further a formula (VII): |Re_{(4 0 0)}-Re_{(7 0 0)}|≤10 and |Rth_{(4 0 0)}-Rth_{(7 0 0)}|≤35. A Nz factor and front retardation value Re₁ of the optical compensating layer satisfy a formula(V): 0.4≤Nz≤0.6, and a formula (VI): 100≤Re₁≤350.;COPYRIGHT: (C)2008,JPO&INPIT