Polyester film and image display devices using the same

Abstract

A polyester film is provided, which has high in-plane hysteresis, excellent thickness uniformity, and good manufacturability, workability, and planarity. The polyester film disclosed has an in-plane hysteresis of 3000 nm to 30000 nm, an area alignment degree of 0.128 to 0.155, and a thickness non-uniformity of 8% or less in the film flow direction (furthermore, the thickness non-uniformity is a value calculated as (maximum thickness - minimum thickness) / average thickness × 100 (%)).

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