Polymer film, flexible light emitting element display device, and rollable display device

A polymer film comprising:

• a binder resin having a weight average molecular weight of 30,000 to 800,000;
• and
• a polyrotaxane including a macrocycle to which a lactone-based compound is bonded, a linear molecule penetrating into the macrocycle, and a blocking group arranged at both ends of the linear molecule to prevent the macrocycle from being separated,
• wherein a rate of a polyrotaxane in which an end of the lactone-based compound is substituted by a (meth)acrylate-based compound in the entire polyrotaxane is 40 mol % to 70 mol %, and
• the polymer film is bent over a mandrel having a diameter of 10 mm or less without cracking in a mandrel test.