Patent ID: 7751005

Claim:
An IPS (In Plane Switching) mode type liquid crystal display apparatus comprising a liquid crystal cell, a first polarizing plates provided on a viewing side of the liquid crystal cell, and a second polarizing plate provided on a backlight light-source side of the liquid crystal cell, wherein the second polarizing plate comprising a polarizer, a first polarizing plate protective film provided on a liquid crystal cell side of the polarizer, a second polarizing plate protective film provided on a backlight light-source side, and the second polarizing plate protective film is a cellulose ester film having a film thickness of 20-50 μm, wherein the cellulose ester film comprises a compound exhibiting negative orientation birefringence, and Ro of the polarizing plate protective film of the second polarizing plate, Ro being expressed by the following Expression (i), satisfies the following relationship: 0 nm≦Ro≦2 nm and Rt of the polarizing plate protective film of the second polarizing plate, Rt being expressed by the following Expression (ii), satisfies the following relationship: −5 nm≦ Rt≦ 5 nm and in the second polarizing plate protective film, temperature fluctuation ΔRt (t) defined below satisfies the following relationship; 0 nm≦ΔRt(t)≦7 nm and humidity fluctuation ΔRt (h) defined below satisfies the following relationship; 0 nm≦ΔRt(h)≦20 nm wherein Ro =( nx−ny )× d Expression (i) Rt =[( nx+ny )/2− nz]×d Expression (ii) wherein nx is a refractive index in the retardation axis direction in the film plane of the cellulose ester film, ny is a refractive index in the direction perpendicular to the retardation axis, nz is a refractive index in the film thickness direction, and d is a film thickness (nm); temperature fluctuation ΔRt (t): difference between Rt value under the environment of 23° C. and 55% RH for 24 hours, and Rt value under the environment of 35° C. and 27% RH for 24 hours; and humidity fluctuation ΔRt (h): difference between Rt value under the environment of 23° C. and 20% RH for 24 hours, and Rt value under the environment of 23° C. and 80% RH for 24 hours.