Patent ID: 11934226
Assignee: TOYOBO CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  B  C  H  Y | IPC G

Claim 0:
1. A foldable display comprising a surface protection film and a polarizer, wherein
the surface protection film comprises a polyester film,
the angle made by the slow axis of the polyester film with the absorption axis of the polarizer is 10 to 80°, and
the polyester film satisfies the following conditions:
(1) the polyester film has a refractive index in the bending direction of 1.590 to 1.606,
(2) the polyester film has a refractive index in the direction of a folding portion of 1.670 to 1.700,
(3) the polyester film has a refractive index in the thickness direction of 1.520 or less, and
(4) the polyester film has a density of 1.380 g/cm3 or more,
wherein the bending direction refers to a direction orthogonal to the folding portion of the polyester film to be folded,
wherein the polyester film is a biaxially stretched polyethylene terephthalate film,
wherein the foldable display comprises an easy-to-adhere layer on at least one surface of the polyester film and a hard coating layer having a thickness of 1 to 50 μm on at least one surface of the polyester film, and
wherein the hard coating layer is present on the easy-to-adhere layer on at least one surface of the polyester film.