Liquid crystal display device, polarizer and protective film

A protective film comprising a polyethylene terephthalate-based resin film, the polyethylene terephthalate-based resin film satisfying the following (1)-(3):

• (1) the polyethylene terephthalate-based resin film has an in-plane retardation of 3000 to 30000 nm;
• (2) a contrast transfer function (CTF) value of periodic unevenness of an x value of chromaticity at an observation angle of 55 degrees is 1.2 or less when the polyethylene terephthalate-based resin film is bonded to the light source side of a light-source-side protective film of a light-source-side polarizer in a liquid crystal display device comprising as a backlight light source a white-light-emitting diode that has one or more peak tops in an emission spectrum in each of wavelength regions of 400 nm or more and less than 495 nm, 495 nm or more and less than 600 nm, and 600 nm or more and 780 nm or less and comprises K2SiF6:Mn4+ as a phosphor;
• and
• (3) the polyethylene terephthalate-based resin film has a rigid amorphous fraction of 33 wt % or more.