US-20260129752-A1 - FLEXIBLE PRINTED CIRCUIT AND ELECTRONIC DEVICE

Abstract

This application provides a flexible printed circuit and an electronic device. The flexible printed circuit comprises at least one moving section arranged along its length direction. By providing a dividing groove in at least one moving section, the dividing groove divides the moving section into a first portion and a second portion. The dividing groove may absorb a deformation generated when the flexible printed circuit bends, and the first portion and the second portion are completely divided and do not affect each other, reducing the deformation of the first portion and the second portion, reducing the overall arching degree of the flexible printed circuit, and reducing the pressure exerted by the flexible printed circuit on adjacent components. As a result, issues such as abnormal pressing noise and film printing of the electronic device can be improved.

Inventors

• Kangle Xue
• Pinrui ZHOU
• Wenhao Wang
• Lijun Yang

Assignees

• HONOR DEVICE CO., LTD.

Dates

Publication Date

20260507

Application Date

20251231

Priority Date

20230711

Claims (20)

1. 1 . An electronic device, comprising: a flexible printed circuit, the flexible printed circuit comprising at least one moving section arranged along a length direction of the flexible printed circuit, and the at least one moving section being movable in the electronic device; wherein the at least one moving section is provided with a dividing groove, and the dividing groove divides the moving section into a first portion and a second portion along a width direction of the flexible printed circuit.
2. 2 . The electronic device according to claim 1 , wherein the first portion is an integrated portion, and at least a portion of the second portion is a multilayer section, and wherein the multilayer section comprises at least two structural layers arranged along a thickness direction of the flexible printed circuit, and the structural layers are separated from each other.
3. 3 . The electronic device according to claim 2 , wherein a plurality of radio frequency signal lines are arranged in the flexible printed circuit, and at least a portion of the radio frequency signal lines are distributed to the first portion.
4. 4 . The electronic device according to claim 1 , wherein the dividing groove comprises a main groove section, and wherein an extending direction of the main groove section forms an angle with the width direction of the flexible printed circuit, and the main groove section extends to both ends of the moving section.
5. 5 . The electronic device according to claim 4 , wherein two sides of the flexible printed circuit in the width direction are configured as a first side and a second side, respectively, and wherein the main groove section is located near the first side, and the first portion is located between the first side and the main groove section.
6. 6 . The electronic device according to claim 4 , wherein at least a portion of the main groove section extends along the length direction of the flexible printed circuit.
7. 7 . The electronic device according to claim 4 , wherein the dividing groove further comprises at least one branch groove section, and the branch groove section intersects with and communicates with the main groove section.
8. 8 . The electronic device according to claim 7 , wherein the branch groove section is located in the second portion, and wherein one end of the branch groove section communicates with the main groove section, and another end of the branch groove section extends in a direction away from the main groove section.
9. 9 . The electronic device according to claim 8 , wherein the branch groove section is connected to a middle portion of the main groove section.
10. 10 . The electronic device according to claim 8 , wherein the branch groove section is connected to an end of the main groove section.
11. 11 . The electronic device according to claim 10 , wherein the main groove section is an arc-shaped section, and the branch groove section extends along a tangential direction of the main groove section.
12. 12 . The electronic device according to claim 4 , wherein the at least one moving section provided with the dividing groove is a bending section, and the bending section bends toward a side where the first portion is located.
13. 13 . The electronic device according to claim 12 , wherein a corner portion of the bending section is provided with a crack arrest groove, and an extending shape of the main groove section matches a shape of the crack arrest groove.
14. 14 . The electronic device according to claim 1 , the flexible printed circuit further comprising at least two fixing portions, wherein each of the fixing portions is arranged at intervals along the length direction of the flexible printed circuit, the fixing portions are configured to be fixedly connected to components of the electronic device, and the moving section is located between adjacent fixing portions.
15. 15 . The electronic device according to claim 14 , wherein the at least two fixing portions comprise two end fixing portions and at least one middle fixing portion, and wherein the two end fixing portions are located at both ends of the flexible printed circuit, respectively, the end fixing portions are configured to connect with the components in the electronic device, and the middle fixing portion is located between the two end fixing portions; wherein the moving section between at least one of the end fixing portions and the adjacent middle fixing portion is provided with the dividing groove.
16. 16 . The electronic device according to claim 15 , wherein in the moving section provided with the dividing groove and located between the end fixing portion and the middle fixing portion, two side regions of the second portion are multilayer sections, and a middle region thereof is an integrated section.
17. 17 . The electronic device according to claim 15 , wherein the moving section between the adjacent middle fixing portions is the multilayer section.
18. 18 . The electronic device according to claim 4 , wherein along the extending direction of the main groove section, the main groove section comprises a first section, a middle section, and a second section connected in sequence, and a maximum width of the first section and a maximum width of the second section are both smaller than a minimum width of the middle section; wherein a width of the main groove section gradually decreases from a center of the main groove section toward an edge of the main groove section.
19. 19 . The electronic device according to claim 1 , further comprising a housing assembly, wherein the flexible printed circuit is located in the housing assembly, and the flexible printed circuit is connected with at least two components in the housing assembly.
20. 20 . The electronic device according to claim 19 , wherein the housing assembly comprises a first middle frame, a second middle frame, and a rotating shaft, and the first middle frame and the second middle frame are movably connected to two sides of the rotating shaft, respectively; wherein a first end of the flexible printed circuit is connected with components installed to the first middle frame, and a second end of the flexible printed circuit passes through the rotating shaft and is connected with components installed to the second middle frame; the electronic device further comprises a first display screen and a second display screen; wherein the first display screen is attached to a first side of the first middle frame and of the second middle frame; wherein the second display screen is attached to a second side of the second middle frame, and the second side is opposite to the first side; and wherein the moving section near the second end of the flexible printed circuit is provided with the dividing groove.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2024/083001, filed on Mar. 21, 2024, which claims priority to Chinese Patent Application No. 202310851357.X, filed on Jul. 11, 2023, both of which are incorporated herein by reference in their entireties. TECHNICAL FIELD This application relates to the field of electronic devices, and in particular, to a flexible printed circuit and an electronic device. BACKGROUND A foldable electronic device is typically provided therein with a through-shaft FPC (Flexible Printed Circuit, flexible printed circuit), where the through-shaft FPC is configured to pass through a rotating shaft and connect components located in middle frames on both sides of the rotating shaft to enable new signal transmission between the components in the middle frames on two sides. Due to tolerances of the components of the electronic device during production and installation, it is usually necessary to reserve a certain redundant length for the through-shaft FPC to compensate for the tolerances of these components and to meet a bending requirement of the through-shaft FPC. However, under a condition where the components are well installed, the redundant length of the through-shaft FPC cannot be effectively utilized. On the contrary, there are phenomena such as accumulating, bending, and arching in the through-shaft FPC, and in severe cases, the through-shaft FPC may adhere closely to and squeeze adjacent components, causing issues such as abnormal pressing noise. SUMMARY This application provides a flexible printed circuit and an electronic device, where the flexible printed circuit may address issues such as redundant warping and abnormal pressing noise caused by squeezing the components. On one hand, this application provides a flexible printed circuit configured to be installed in an electronic device. The flexible printed circuit comprises at least one moving section arranged along a length direction of the flexible printed circuit, and the moving section is movable in the electronic device; wherein the at least one moving section is provided with a dividing groove, and the dividing groove divides the moving section into a first portion and a second portion along a width direction of the flexible printed circuit. The flexible printed circuit provided by this application comprises at least one moving section arranged along its length direction. By providing the dividing groove on at least one moving section, the moving section is divided into the first portion and the second portion along the width direction of the flexible printed circuit by utilizing the dividing groove. The dividing groove may absorb deformations generated when the flexible printed circuit is bent, and the first portion and the second portion are completely divided and do not affect each other, which may reduce the deformations of the first portion and the second portion, reduce an overall arching degree of the flexible printed circuit, and reduce the pressure exerted by the flexible printed circuit on the adjacent components. As a result, issues such as the abnormal pressing noise and film printing of the electronic device may be improved. In a possible implementation, the first portion is an integrated portion, and at least a portion of the second portion is a multilayer section, where the multilayer section comprises at least two structural layers arranged along a thickness direction of the flexible printed circuit, and the structural layers are separated from each other. By designing the first portion as the integrated portion and designing at least a portion of the second portion as a multilayer region, the multilayer region comprises at least two structural layers that are sequentially stacked and separated from each other. The dividing groove completely divides the first portion and the second portion, where the first portion has a relatively higher overall hardness and better resistance to deformation, which may reduce the arching degree, and the second portion has a relatively low hardness and high flexibility due to its multilayer region. Due to the presence of an air layer between the structural layer of the multilayer region, the pressure exerted on the adjacent components is relatively small, and an overall deformation degree of the flexible printed circuit may be reduced, and the pressure of the flexible printed circuit on the adjacent components may be lowered. In a possible implementation, at least a portion of radio frequency signal lines in the flexible printed circuit are distributed to the first portion. By arranging a portion or even all of the radio frequency signal lines in the first portion, where the first portion is an integrated portion, the performance of the radio frequency signal lines may be ensured, avoiding radio frequency signal loss, and contributing to improve a communication efficiency and a call quality of the electroni