Patent ID: 11951730
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC B  H  G | IPC B

Claim 0:
1. A back film for a flexible display device, comprising:
a release layer; and
a first base material layer bounded on the release layer via a transparent first adhesive layer, and a second base material layer bounded on the release layer via a second adhesive layer, wherein there is a gap between orthographic projections of the first base material layer and the second base material layer on the release layer;
wherein,
the first base material layer has a transmittance of 85% or more and a haze of 5% or less;
the second base material is different from the first base material;
the second base material has an elastic modulus and/or a breaking strength greater than those of the first base material; and
the first adhesive has an elastic modulus greater than that of the second adhesive.