公开(公告)号：US20230174826A1

公开(公告)日：2023-06-08

申请号：US17922258

申请日：2021-04-29

Applicant: Huawei Technologies Co., Ltd.

Inventor： Huan Pang ,  Chengwen Hu ,  Junyan Tan ,  Yujia Zhou ,  Yin Li ,  Yihong Huang

IPC: C09J7/29 ,  C09J7/38 ,  G02B1/14 ,  G02B1/111

CPC classification number: C09J7/29 ,  C09J7/385 ,  G02B1/14 ,  G02B1/111 ,  C09J2203/326 ,  C09J2301/41 ,  C09J2467/006 ,  C09J2479/086 ,  C09J2475/006 ,  C09J2433/006 ,  C09J2433/00 ,  C09J2471/006 ,  C09J2483/006 ,  G02B1/16

Abstract: A protective film includes an adhesive layer and a base film layer that are stacked. The adhesive layer is configured to adhere to a foldable display. The base film layer includes one or more layers of high-modulus base film and one or more layers of low-modulus base film. An elastic modulus of the high-modulus base film is greater than an elastic modulus of the low-modulus base film. The high-modulus base film and the low-modulus base film are alternately stacked. A surface layer in the base film layer and non-adjacent to the adhesive layer is the high-modulus base film. The protective film is configured to be firmly attached to the foldable display, resists rebounding and warping when the display is bent, and protects the foldable display.