Polyester protection film for polarising plate, polarising plate comprising same, and liquid crystal display apparatus comprising same

A polyester protective film for polarizing plates having a yellow index (YI) of 1.0 or less, wherein the polyester protective film includes a UV absorber represented by Formula 1 and a UV absorber represented by Formula 2:

• wherein the polyester protective film has an out-of-plane retardation of 2,500 nm to 12,000 nm as measured at a wavelength of 550 nm and represented by Equation 3:
• Rth=((nx+ny)/2−nz)×d <Equation 3>
• wherein in Equation 3, Rth is the out-of-plane retardation, nx, ny and nz are indices of refraction in the slow axis, fast axis, and thickness directions of the polyester protective film at the wavelength of 550 nm respectively, and d is a thickness of the polyester protective film with a unit of nm, and
• wherein the polyester protective film has a change in yellow index (ΔYI) of 0.7 or less, as calculated according to Equation 4:
• Change in yellow index=YI2−YI1 <Equation 4>
• wherein YI1 denotes an initial yellow index of the polyester protective film and YI2 denotes a yellow index measured after irradiation with light at a fluence of 0.68 W/m2 at a wavelength of 340 nm at 63° C. and 40% RH for 500 hours.