| abstract |
The polyester film according to the embodiment adjusts the deformed dimension compared to the initial in the cycle of stretching and relaxing the film, and in particular, by adjusting the ratio between the deformed dimension for two perpendicular directions in the plane to a specific range, it is not originally even for multiple repetitive folding. The characteristics of can be maintained. Accordingly, the polyester film may be applied to a cover of a flexible display device, particularly a foldable display device, and exhibit excellent properties. |