Polarizing plate, method of preparing the same, and liquid crystal display apparatus including the same

摘要

A polarizing plate, a method of preparing the same and a liquid crystal display apparatus including the same are disclosed. The polarizing plate includes a polarizer and a polyester film formed on a surface of the polarizer, wherein the polyester film has a ratio of an elongation ratio in a machine direction to an elongation ratio in a transverse direction of about 1:0.8 to about 1:1.2, an in-plane retardation (Re) of about 500 nm or less at a wavelength of 550 nm, and an out-of-plane retardation (Rth) of about 10,000 nm or less at a wavelength of 550 nm.

主权项

1. A polarizing plate comprising:
a polarizer; and a polyester film on a surface of the polarizer, and an optical film on an other surface of the polarizer, the optical film having an angle of axis distortion of a fast axis of the optical film with respect to an absorption axis of the polarizer of about +0.03° or greater and less than about +0.2°; the polyester film having a ratio of an elongation ratio in a machine direction to an elongation ratio in a transverse direction of about 1:0.8 to about 1:1.2, an in-plane retardation (Re) of about 500 nm or less at a wavelength of 550 nm as calculated by Equation 1, and an out-of-plane retardation (Rth) of about 1,000 nm to about 10,000 nm at a wavelength of 550 nm as calculated by Equation 2:
Re=(nx−ny)×d  Equation 1Rth=((nx+ny)/2−nz)×d  Equation 2 wherein mc is a refractive index at a wavelength of 550 nm in an x-axis direction of the polyester film, ny is a refractive index of the polyester film at a wavelength of 550 nm in a y-axis direction of the polyester film, nz is a refractive index at a wavelength of 550 nm in a z-axis direction of the polyester film, and d is a thickness of the polyester film in nm.