Patent ID: 8580358
Filing Date: 2013-11-12
Classification: C08J,C08K,C08L,C09K,G02B,G02F

Abstract:
1. An in-plane switching mode display comprising a liquid crystal cell and a polarizing plate on at least a viewer side of the liquid crystal cell, the polarizing plate comprising a polarizer and a cellulose ester film on at least one of the surfaces of the polarizer, wherein the cellulose ester film does not contain any compounds containing an aromatic ring and comprises a polyester represented by Formula (1) or a polyester represented by Formula (2), wherein B wherein B (i) an in-plane retardation value of the cellulose ester film (Ro) is 0 to 5 nm and a retardation value in a thickness direction of the cellulose ester film (Rt) is −20 to 10 nm, Ro and Rt are represented by the following formulas, respectively, wherein d is thickness (nm) of the film, nx is the maximum in-plane refractive index of the film, ny is the in-plane refractive index of the film in the direction orthogonal to the axis direction having the maximum in-plane refraction index, and nz is the refractive index in the thickness direction of the film, and Ro and Rt are values measured under a condition of 23° C. and 55% RH employing a 590 nm wavelength light; (ii) a weight content of the polyester represented by Formula (1) or the polyester represented by Formula (2) is 2 to 30 weight % based on a weight of the cellulose ester; (iii) a weight average molecular weight (mw) of the polyester represented by Formula (1) or the polyester represented by Formula (2) is not more than 20,000; (iv) a thickness of the cellulose ester film is 20 to 80 μm; and (v) the polyester represented by Formula (1) or the polyester represented by Formula (2) has a function to lower retardation values Ro and Rt.