Electromagnetic shielding film, flexible circuit board and display device

Patent metadata

Field	Value
Publication number	US-11765873-B2
Application number	US-202017425991-A
Country	US
Kind code	B2
Filing date	Aug 26, 2020
Priority date	Aug 26, 2020
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present disclosure provides an electromagnetic shielding film, a flexible circuit board and a display device. The electromagnetic shielding film includes a central portion and an edge portion. The central portion has a plurality of surrounding side edges; and the edge portion is provided on at least one side edge of the central portion, and includes a plurality of protruding units protruding away from the central portion. The plurality of protruding units are arranged in an extending direction of the side edge where the edge portion is located. The electromagnetic shielding film is used to attach on a flexible circuit board body, the central portion is located on a non-bending area, and the edge portion is located on a bending area, so that the flexible circuit board is formed.

First claim

What is claimed is:

1. An electromagnetic shielding film, comprising:
a central portion, having a plurality of surrounding side edges; and
an edge portion, provided on at least one side edge of the central portion, and comprising a plurality of protruding units protruding away from the central portion, the plurality of protruding units being arranged in an extending direction of the side edge where the edge portion is located,
wherein the electromagnetic shielding film is flexible, comprises an insulating layer, a metal shielding layer and a conductive adhesive layer, and is configured to shield electromagnetic waves, and
wherein the plurality of protruding units each has a shape of at least one of a triangle, a semicircle, or a semiellipse, and the plurality of protruding units are directly connected with each other in the extending direction of the side edge where the edge portion is located.

2. The electromagnetic shielding film according to claim 1 , wherein the central portion comprises a first side edge and a second side edge, and the electromagnetic shielding film comprises a first edge portion and a second edge portion,
the first edge portion is located on the first side edge and comprises a plurality of first protruding units protruding away from the central portion, and the plurality of first protruding units are arranged in an extending direction of the first side edge, and
the second edge portion is located on the second side and comprises a plurality of second protruding units protruding away from the central portion, and the plurality of second protruding units are arranged in an extending direction of the second side edge.

3. The electromagnetic shielding film according to claim 2 , wherein shapes or areas of the plurality of first protruding units are same, and shapes or areas of the plurality of second protruding units are same, and the first protruding unit has a same shape or area as that of the second protruding unit.

4. The electromagnetic shielding film according to claim 3 , wherein the first protruding unit and the second protruding unit have a shape of a rectangle, a triangle, a semicircle, or a semiellipse.

5. The electromagnetic shielding film according to claim 2 , wherein the central portion of the electromagnetic shielding film has a rectangular shape, and the first side edge and the second side edge are arranged opposite to each other.

6. A flexible circuit board, comprising:
a flexible circuit board body, comprising a non-bending area and a bending area located on at least one side edge of the non-bending area; and
at least one electromagnetic shielding film, covering the flexible circuit board body,
wherein the electromagnetic shielding film comprises:
a central portion, having a plurality of surrounding side edges; and
an edge portion, provided on at least one side edge of the central portion, and comprising a plurality of protruding units protruding away from the central portion, the plurality of protruding units being arranged in an extending direction of the side edge where the edge portion is located,
wherein the electromagnetic shielding film is flexible, comprises an insulating layer, a metal shielding layer and a conductive adhesive layer, and is configured to shield electromagnetic waves,
wherein the plurality of protruding units each has a shape of at least one of a triangle, a semicircle, or a semiellipse, and the plurality of protruding units are directly connected with each other in the extending direction of the side edge where the edge portion is located, and
wherein the central portion of the electromagnetic shielding film is located on the non-bending area, and the edge portion of the electromagnetic shielding film is located on the bending area.

7. The flexible circuit board according to claim 6 , wherein the edge portion of the electromagnetic shielding film is located at a side, close to the non-bending area, of a bending axis of the bending area.

8. The flexible circuit board according to claim 7 , wherein the central portion of the electromagnetic shielding film comprises a first side edge and a second side edge, and the electromagnetic shielding film comprises a first edge portion and a second edge portion; the first edge portion is located on the first side edge and comprises a plurality of first protruding units protruding away from the central portion, and the plurality of first protruding units are arranged in an extending direction of the first side edge; the second edge portion is located on the second side edge and comprises a plurality of second protruding units protruding away from the central portion, and the plurality of second protruding units are arranged in an extending direction of the second side edge; and the flexible circuit board body comprises a first bending area at a side of the non-bending area and a second bending area at another side of the non-bending area, and
wherein the central portion of the electromagnetic shielding film is located on the non-bending area of the flexible circuit board body; the first edge portion of the electromagnetic shielding film is located on the first bending area of the flexible circuit board body and is located at a side, close to the non-bending area, of a bending axis of the first bending area; and the second edge portion of the electromagnetic shielding film is located on the second bending area of the flexible circuit board body and is located at a side, close to the non-bending area, of a bending axis of the second bending area.

9. The flexible circuit board according to claim 8 , wherein the flexible circuit board comprises two said electromagnetic shielding films that respectively are a first electromagnetic shielding film and a second electromagnetic shielding film, the flexible circuit board body comprises a first surface and a second surface opposite to each other, the first electromagnetic shielding film covers the first surface of the flexible circuit board body, and the second electromagnetic shielding film covers the second surface of the flexible circuit board body; and
wherein the central portions of the first electromagnetic shielding film and the second electromagnetic shielding film are both located on the non-bending area of the flexible circuit board body, the first edge portions of the first electromagnetic shielding film and the second electromagnetic shielding film are both located on the first bending area and are both located at the side, close to the non-bending area, of the bending axis of the first bending area, and the second edge portions of the first electromagnetic shielding film and the second electromagnetic shielding film are both located on the second bending area and are both located at the side, close to the non-bending area, of the bending axis of the first bending area.

10. The flexible circuit board according to claim 9 , wherein a projection of the first edge portion of the first electromagnetic shielding film on the flexible circuit board body does not overlap with a projection of the first edge portion of the second electromagnetic shielding film on the flexible circuit board body, and/or a projection of the second edge portion of the first electromagnetic shielding film on the flexible circuit board body does not overlap with a projection of the second edge portion of the second electromagnetic shielding film on the flexible circuit board body.

11. The flexible circuit board according to claim 9 , wherein the non-bending area of the flexible circuit board body, the central portion of the first electromagnetic shielding film, and the central portion of the second electromagnetic shielding portion have a rectangular shape, the first bending

Assignees

• Boe Technology Group Co Ltd

Inventors

• Li Yuanyuan
• Zheng Meizhu
• Wang Jiuzhen
• Xiang Dalin
• Liu Lina
• Bo Zewen

Classifications

• H05K1/0216 Primary

  Reduction of cross-talk, noise or electromagnetic interference (grounding H05K1/0215) · CPC title

• H05K9/0081 Primary

  Electromagnetic shielding materials, e.g. EMI, RFI shielding (H05K9/0003 takes precedence) · CPC title

• H01B5/14

  comprising conductive layers or films on insulating-supports · CPC title

• H05K2201/0715

  provided by an outer layer of PCB · CPC title

• H05K1/189

  characterised by the use of flexible or folded printed circuits · CPC title