Patent ID: 11950355
Assignee: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method for preparing a flexible circuit board, comprising:
forming a first conductive layer on a first surface of a substrate layer, the first conductive layer comprising a plurality of first traces and a first conductive portion, and the first conductive portion being insulated from the first traces and being grounded;
forming a second conductive layer on a second surface of the substrate layer opposite to the first surface, the second conductive layer comprising a plurality of second traces and a second conductive portion, and the second conductive portion being insulated from the second traces and being grounded;
forming a first cover film on a side of the first conductive layer facing away from the substrate layer, a part of the first cover film overlapping the first conductive portion being provided with a plurality of first hollow portions;
forming a second cover film on a side of the second conductive layer facing away from the substrate layer, a part of the second cover film overlapping the second conductive portion being provided with a plurality of second hollow portions; wherein an orthographic projection of each of the first hollow portions on the substrate layer has an overlapping area with an orthographic projection of at least one of the second hollow portions on the substrate layer;
forming a first electromagnetic shielding layer on a side of the first cover film facing away from the substrate layer, the first electromagnetic shielding layer being coupled to the first conductive portion through the first hollow portions; and
forming a second electromagnetic shielding layer on a side of the second cover film facing away from the substrate layer, the second electromagnetic shielding layer being coupled to the second conductive portion through the second hollow portions.