OPTICAL POLYESTER FILM, AND POLARIZATION PLATE AND TRANSPARENT CONDUCTIVE FILM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a polyester film that can suppress interference colors when mounted in a display device such as a liquid crystal display with a large screen, regardless of being a biaxially oriented polyester film.SOLUTION: There is provided a laminated polyester film of at least two or more layers having a polyester A layer and a polyester B layer with a fusing point lower than that of the polyester A layer, where the maximum value (P max) and the minimum value (P min) of a photoelastic coefficient within a range of 10 square centimeters of the film satisfy the following formula (I): P max/P min≤2.3.