CN112750362A

CN112750362A - Flexible circuit board and display device

Info

Publication number: CN112750362A
Application number: CN201911038186.9A
Authority: CN
Inventors: 张齐钧; 李亮; 王国辉; 丁雪枫; 任富健; 季斌; 李天马
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2021-05-04

Abstract

The invention discloses a flexible circuit board and a display device, relates to the technical field of display, and aims to solve the problem that a plug-in end of the flexible circuit board in the display device is easy to separate from a main control circuit board. The flexible circuit board includes: a circuit board body having opposing first and second edges; the first extending part is connected with the first edge, and the end part of the first extending part, which is far away from the circuit board main body, is a first binding end; the end part of the plug-in extension part, which is far away from the circuit board main body, is a plug-in end; and the end part of the second extension part, which is far away from the circuit board main body, is a second binding end. The flexible circuit board provided by the invention is used for the display device.

Description

Flexible circuit board and display device

Technical Field

The invention relates to the technical field of display, in particular to a flexible circuit board and a display device.

Background

A Flexible Printed Circuit (FPC) has excellent characteristics of light weight, thin thickness, free bending and folding, and the like, and is widely used in a display device.

At present, a display device mainly includes a display panel, a flexible circuit board, and a main control circuit board. The binding end of the flexible circuit board is bound in the binding area of the display panel, and the inserting end of the flexible circuit board is inserted in the main control circuit board, so that the display device can display images. However, in the conventional display device, the plug end of the flexible circuit board is easily separated from the main control circuit board, so that the display device is prone to have a problem that normal display cannot be performed.

Disclosure of Invention

The invention aims to provide a flexible circuit board which is used for solving the problem that a plug-in end of the flexible circuit board is easy to separate from a main control circuit board in a display device.

In order to achieve the above purpose, the invention provides the following technical scheme:

a first aspect of the present invention provides a flexible circuit board including: a circuit board body having opposing first and second edges; the first extending part is connected with the first edge, and the end part of the first extending part, which is far away from the circuit board main body, is a first binding end; the end part of the plug-in extension part, which is far away from the circuit board main body, is a plug-in end; the end part of the second extension part, which is far away from the circuit board main body, is a second binding end; wherein, in a direction parallel to the second edge, a midpoint of a connecting line between a center of the second binding end and a center of the first binding end is located between a center of the splicing end and a center of the first binding end; alternatively, the center of the first binding end and the center of the second binding end are symmetrical about a line drawn between the center of the splicing end and the midpoint of the connecting line.

Optionally, an edge of the second extension portion adjacent to the first extension portion is connected to an edge of the first extension portion adjacent to the second extension portion.

Optionally, a dimension of the second extension in a direction parallel to the second edge is greater than or equal to 10mm and less than or equal to 15 mm.

Optionally, a ratio between a maximum dimension of the plug extension in a direction parallel to the second edge and a minimum dimension of the plug extension in a direction parallel to the second edge is greater than or equal to 1 and less than or equal to 2.

Optionally, the size of the portion of the plug extension, other than the plug end, in the direction parallel to the second edge gradually decreases from the end close to the circuit board main body to the end far from the circuit board main body.

Optionally, the plug extension comprises: one end of the first part is connected with the circuit board main body, and the other end of the first part is a plugging end; the first portion is rectangular.

Optionally, two opposite edges of the first portion extending from the mating end towards the circuit board body are perpendicular to the second edge.

Optionally, the plug extension further comprises: a second portion located on one of opposite sides of the first portion in a direction parallel to the second edge; the second portion is connected to an edge of the first portion and the second edge.

Optionally, the plug extension further comprises: a third portion located on the other of the opposite sides of the first portion in a direction parallel to the second edge; the third portion is connected to the edge of the first portion and the second edge.

Optionally, the second portion is triangular in shape; and/or the third portion is triangular in shape.

Optionally, the circuit board body has a component mounting area thereon; the distance between the boundary of the component mounting region and the second edge is greater than or equal to 14mm and less than or equal to 18 mm.

Optionally, two opposite sides of the inserting end along a direction parallel to the second edge are respectively provided with a positioning protrusion.

Optionally, the flexible circuit board further comprises: the first circuit is arranged on one side of the circuit board main body; the at least one first pin is arranged at the first binding end and is electrically connected with the first circuit; at least one second pin arranged at the second binding end; and the at least one third pin is arranged at the plugging end and is electrically connected with the first circuit.

Optionally, the flexible circuit board further comprises: and the reinforcing plate is arranged on one side of the circuit board main body, which is not provided with the circuit element.

Based on the above technical solution of the flexible circuit board, a second aspect of the present invention provides a display device, including: a display panel including a first binding pad and a second binding pad; as for the flexible circuit board in the first aspect, the pin of the first bonding end of the flexible circuit board is bonded to the first bonding pad of the display panel, and the pin of the second bonding end of the flexible circuit board is bonded to the second bonding pad.

Compared with the prior art, the flexible circuit board and the display device provided by the invention have the following beneficial effects:

the invention provides a flexible circuit board, which comprises a circuit board main body, a first extension part, a second extension part and a plug-in extension part. The circuit board main body is provided with a first edge and a second edge which are opposite, the first extending portion is connected with the first edge, and the end portion, far away from the circuit board main body, of the first extending portion is a first binding end. The second extension part is connected with the first edge, and the end part, far away from the circuit board main body, of the second extension part is a second binding end. The plug extension part is connected with the second edge, and the end part of the plug extension part, which is far away from the circuit board main body, is a plug end.

The midpoint of the connecting line between the center of the second binding end and the center of the first binding end, in a direction parallel to the second edge, is located between the center of the splicing end and the center of the first binding end. Therefore, the distance from the center of the inserting end to the rotating shaft corresponding to the torque of the inserting end can be reduced, the torque of the inserting end is further reduced, the problem that the inserting end is easy to separate from the inserting interface of the main control circuit board is solved, the overlarge size of the second binding end along the direction parallel to the second edge is avoided, and the whole structure of the flexible circuit board is compact and reliable.

The center of the first binding end and the center of the second binding end are symmetrical with respect to a line between the center of the splicing end and the midpoint of the connecting line, i.e. the distance between the midpoint of the connecting line and the center of the splicing end in a direction parallel to the second edge is zero. At the moment, the distance from the center of the inserting end to the rotating shaft corresponding to the torque of the inserting end is zero, namely, the acting force at the center of the inserting end does not generate the torque, so that the problem that the inserting end is easy to separate from the inserting interface of the main control circuit board can be better solved.

It should be noted that the center of the first binding end, the center of the second binding end and the center of the plugging end all refer to the respective centers of mass, i.e. the positions of the respective centers of gravity.

The beneficial effects that the display device provided by the invention can achieve are the same as those that the flexible circuit board provided by the technical scheme can achieve, and are not repeated herein.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a display device according to some embodiments of the present invention;

FIG. 2 is a front view of the display device shown in FIG. 1;

FIG. 3 is a left side view of the display device shown in FIG. 1;

FIG. 4 is a schematic view of a display panel of the display device shown in FIG. 1;

FIG. 5 is a schematic diagram of a main control circuit board in the display device shown in FIG. 1;

fig. 6 is a schematic structural diagram of a flexible circuit board according to some embodiments of the present invention;

FIG. 7 is a schematic diagram of another flexible circuit board according to some embodiments of the present invention;

FIG. 8 is a bottom view of the flexible circuit board of FIG. 7;

FIG. 9 is a rear view of the flexible circuit board of FIG. 7;

FIG. 10 is a front view of the flexible circuit board of FIG. 7;

FIG. 11 is a schematic diagram of a flexible circuit board according to some embodiments of the present invention;

FIG. 12 is a schematic diagram of a flexible circuit board according to some embodiments of the present invention;

FIG. 13 is a schematic diagram of a structure of another flexible circuit board according to some embodiments of the invention;

FIG. 14 is a schematic structural diagram of another flexible circuit board according to some embodiments of the present invention;

FIG. 15 is a schematic diagram of a flexible circuit board according to some embodiments of the present invention;

FIG. 16 is a schematic diagram of a flexible circuit board according to some embodiments of the present invention;

FIG. 17 is a schematic structural diagram of another display panel according to some embodiments of the invention;

FIG. 18 is a schematic structural diagram of a display device according to some embodiments of the present invention;

FIG. 19 is a schematic diagram of another display device according to some embodiments of the invention;

FIG. 20 is a schematic view of a display panel of the display device shown in FIG. 19;

FIG. 21 is a schematic structural view of a fastening structure provided in accordance with some embodiments of the present invention;

fig. 22 is a bottom view of the fixation structure of fig. 21.

Detailed Description

For convenience of understanding, the flexible circuit board and the display device provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Herein, the display device may be a product or a component having a display function, such as a liquid crystal screen, electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, or a navigator.

Fig. 1 to 3 show a display device 02. The display device 02 includes a display panel 021, a fixing structure 022, a main control circuit board 023, and a flexible circuit board 01.

Referring to fig. 1 to 5, a display panel 021 and a main control circuit board 023 are respectively located at two opposite sides of a fixing structure 022, a flexible circuit board 01 has a first binding end 011 and a plugging end 012, a first binding pad 0211 is disposed on the display panel 021, and a plugging interface 0231 is disposed on the main control circuit board 023. The pin of the first binding end 011 is bound on the first binding pad 0211 of the display panel 021, and the plugging end 012 is plugged in the plugging interface 0231, so that a control signal can be sent to the display panel 021 through the main control circuit board 023 and the flexible circuit board 01 to control the display panel 021 to display an image.

For example, the binding is to electrically connect the pin of the first binding port 011 with the first binding pad 0211 of the display panel 021 in a specific manner. For example, an Anisotropic Conductive Film (ACF) is disposed between the leads of the first bonding end 011 and the first bonding pad 0211 of the display panel 021, and then the leads of the first bonding end 011 are fixedly connected to the first bonding pad 0211 of the display panel 021 by hot pressing.

In the moving state of the display device 02 shown in fig. 1 to 3, the plugging terminal 012 of the flexible circuit board 01 is easily plugged from the main control circuit board 023Interface 0231 is removed. The inventor of the present disclosure found through research that: in a first direction z₁(first direction z)₁Perpendicular to the plugging direction z of the plugging terminal 012₂) In the above, the distance d between the center of the first binding end 011 and the center of the plugging end 012 is large, so the rotation axis L corresponding to the torque from the center of the plugging end 012 to the plugging end 012₀Distance D of₀(i.e., D)₀D2) is also relatively large, and the torque of the mating end 012 corresponds to the L from its center to its torque₀Distance D of₀Therefore, in the display device, the torque of the plugging end 012 of the flexible circuit board 1 is large, and the plugging end 1131 is easily separated from the plugging interface of the main control circuit board.

Referring to fig. 6 and 7, some embodiments of the present disclosure provide a flexible circuit board 1, where the flexible circuit board 1 includes a circuit board main body 110, a first extension portion 111, a second extension portion 112, and a plug extension portion 113.

The circuit board body 110 has opposite first edges a₁And a second edge a₂A first extension 111 and a first edge a₁In connection, an end of the first extension portion 111 away from the circuit board main body 110 is a first binding end 1111. The second extension portion 112 and the first edge a₁In this connection, an end of the second extending portion 112 away from the circuit board main body 110 is a second binding end 1121. The plug-in extension 113 and the second edge a₂In this connection, the end of the plug extension 113 away from the circuit board main body 110 is a plug end 1131.

In a direction parallel to the second edge a₂In the direction X, the distance between the inserting end 1131 and the first binding end 1111 is greater than zero, and the second binding end 1121 is located at one side of the first binding end 1111, which is close to the inserting end 1131. This design is advantageous for reducing the center O of the plug extension 113₃The distance from the rotation axis corresponding to the torque of the plug extension 113 is L if the second extension 112 is not provided, as shown in FIG. 6₁(L₁And parallel to the second edge a₂Perpendicular to each other) of the center O of the plug-in extension 113₃Torque-responsive rotational axis L to plug-in extension 113₁A distance ofD₁(D₁Is the center O of the plug-in extension 113₃Center O with first binding end 1111₁In a direction parallel to the second edge a₂Half the pitch of direction X); in the case of the second extension 112, the rotation axis corresponding to the plug extension 113 is L₁Is changed into L₂(L₂And parallel to the second edge a₂Are perpendicular to each other), the center O of the plug-in extension 113 is now at this point₃The distance D from the rotating shaft corresponding to the torque of the plug extension 113₁Is changed into D₂，D₂Is less than D₁. And the torque of the plug-in extension 113 and its center O₃The distance from the rotating shaft to the torque thereof is positive correlation, so the torque of the plug extension portion 113 is reduced, i.e. the torque of the plug end 1131 of the plug extension portion 113 is correspondingly reduced, and thus, after the flexible circuit board 1 is plug-connected with the main control circuit board in the display device, the plug end 1131 of the plug extension portion 113 is not easy to be separated from the plug interface of the main control circuit board.

Note that the center O of the first binding end 1111 is₁And the center O of the plug-in extension 113₃Refer to the respective centers of mass, i.e. the positions at which the respective centers of gravity are located. Furthermore, referring to fig. 6, when the center O of the plug extension 113 is inserted₃When the direction of the acting force F is at a certain angle with the plane of the inserting extension 113, the acting force F needs to be resolved into the acting force F perpendicular to the plane₁And a force F parallel to the plane₂Wherein the torque-generating force is a force F perpendicular to the plane₁I.e. force F₁For calculating the torque of the plug extension. Wherein, it can be understood that the torque of the plug extension 113 corresponds to the rotation axis L₁In the plane of the plug extension 113.

In some embodiments, as shown in FIG. 6, the second edge a is parallel to the first edge₂Direction X of the second binding end 1121, center O of the second binding end 1121₂Center O with the first binding end 1111₁Midpoint O of connecting line therebetween₄At the center O of the inserting end 1131₀Center O with first binding end 1111₁Between. Thus, the center O of the mating end 1131 can be reduced₀The distance from the rotating shaft corresponding to the torque of the inserting end 1131 is further reduced, the torque of the inserting end 1131 is improved, the problem that the inserting end 1131 is easily separated from the inserting interface of the main control circuit board is solved, and the edge of the second binding end 1121 is not parallel to the second edge a₂Is too large, i.e. the overall structure of the flexible circuit board 1 is made compact and reliable.

In other embodiments, center O of first binding end 1111₁Center O of the second binding end 1121₂Center O of plug end 1131₀And the midpoint O of the connecting line₄Is symmetrical with respect to the connecting line, i.e. the midpoint O of said connecting line₄To the center O of the spigot end 1131₀In parallel to the second edge a₂Is zero in the direction X. At this point, center O of spigot end 1131₀The distance from the torque-responsive shaft of the insertion end 1131 is zero, i.e., the center O of the insertion end 1131₀The acting force does not generate torque, so that the problem that the plugging end 1131 is easy to be separated from the plugging interface of the main control circuit board can be better solved.

It should be noted that the center O of the second binding end 1121₂And center O of spigot end 1131₀Refer to the respective centers of mass, i.e. the positions at which the respective centers of gravity are located.

Illustratively, as shown in FIG. 6, the center O of the mating end 1131₀With the center O of the plug-in extension 113₃On the same axis L₃Upper, axis L₃And parallel to the second edge a₂Are perpendicular to each other.

In some embodiments, as shown in fig. 7, an edge of the second extension 112 near the first extension 111 is connected to an edge of the first extension 111 near the second extension 112. At this time, the first extension portion 111 and the second extension portion 112 are of an integrated structure, so that the overall structure of the flexible circuit board 1 is compact, and the overall structure strength of the flexible circuit board 1 is improved, and the flexible circuit board 1 is more stable after being connected with a display panel and a main control circuit board in a display device.

In some embodiments, the second extension 112 is parallel to the second edge a₂Dimension D in the direction X of₃Greater than or equal to 10mm and less than or equal to 15 mm. Thus, on one hand, the second binding end 1121 of the second extension portion 112 can be reliably bound to the display panel in the display device, and the second binding end 1121 of the second extension portion 112 is not easily extended beyond the display panel. On the other hand, it is beneficial to reduce the torque of the plug extension portion 113 and improve the problem that the plug end 1131 is easily separated from the plug interface of the main control circuit board.

Illustratively, the second extension 112 is parallel to the second edge a₂Dimension D in the direction X of₃10mm, 11mm, 12mm, 13mm, 14mm or 15 mm. When the second extension 112 is parallel to the second edge a₂Dimension D in the direction X of₃When the thickness is 10mm or close to 10mm, the overall mass of the flexible circuit board 1 is smaller, so that the second binding end 1121 of the second extension portion 112 is conveniently located on a display panel in the display device, and the problem that the plugging end 1131 is easily separated from the plugging interface of the main control circuit board is improved. When the second extension 112 is parallel to the second edge a₂Dimension D in the direction X of₃When the thickness is 15mm or close to 15mm, the connection portion between the second binding end 1121 of the second extension portion 112 and the display panel can be increased, so as to better solve the problem that the plugging end 1131 is easily separated from the plugging interface of the main control circuit board.

Illustratively, the first edge a₁And a second edge a₂The flexible circuit board 1 is parallel to each other, so that the flexible circuit board 1 is neat in structure, and the stability of the flexible circuit board 1 in the display device is improved.

In some embodiments, as shown in fig. 8, the flexible circuit board 1 further includes a first circuit disposed on the circuit board body 110 and at least one second pin 1122 disposed on the second bonding end 1121 and not electrically connected to the first circuit. By such a design, the second binding end 1121 of the flexible circuit board 1 is only mechanically connected to the display panel in the display device through the at least one second pin 1122, but is not electrically connected, that is, the second binding end 1121 is only configured to improve the problem that the inserting end 1131 is easily separated from the inserting interface of the main control circuit board, and the original circuit structure of the flexible circuit board 1 is not affected, so that the flexible circuit board 1 is convenient to produce and manufacture.

Illustratively, the first circuit includes, but is not limited to, a power supply circuit, a filter circuit, a rectifier circuit, and the like.

Illustratively, as shown in fig. 7 and 8, a component mounting area 1101 is disposed on the circuit board main body 110 of the flexible circuit board 1, and each circuit component in the first circuit, such as an inductor, a resistor, a capacitor, an inductor, etc., is disposed in the component mounting area 1101 of the circuit board main body 110.

In some embodiments, as shown in fig. 8 and 9, the flexible circuit board 1 further includes at least one first pin 1112 and at least one third pin 1132. The at least one first pin 1112 is disposed at the first binding end 1111, and the at least one first pin 1112 is electrically connected to the first circuit. The at least one third pin 1132 is disposed at the inserting end 1131, and the at least one third pin 1132 is electrically connected to the first circuit. By the design, under the condition that the first binding end 1111 of the flexible circuit board 1 is bound on the display panel and the inserting end 1131 of the flexible circuit board 1 is inserted into the main control circuit board, the main control circuit board can be electrically connected with the display panel, so that the display panel can be controlled by the main control circuit board to display images.

In some embodiments, as shown in fig. 9, the flexible circuit board 1 further includes a reinforcing plate 12, the reinforcing plate 12 is disposed on a side of the circuit board main body 110 away from the circuit components, and an orthographic projection of the reinforcing plate 12 on the circuit board main body 110 coincides with the circuit board main body 110. By such a design, the structural strength of the circuit board main body 110 is improved, thereby improving the structural stability of the flexible circuit board 1.

Illustratively, the stiffener 12 is a polyimide flexible substrate.

In some embodiments, referring to fig. 6 and 7, the circuit board main body 110, the first extension 111, the second extension 112 and the plug extension 113 are an integrally formed substrate 11. Illustratively, the substrate 11 is a polyimide flexible substrate.

In some embodiments, as shown in fig. 7, at least one first fixing hole 1102 is respectively disposed on the circuit board main body 110 at positions on opposite sides of the component mounting region 1101. The flexible circuit board 1 can be fixed on the fixing structure by at least one connecting member (e.g., a screw or a bolt) passing through the at least one first fixing hole 1102 and being connected to the fixing structure in the display device, so as to further improve the reliability of the display device, and make the plugging end 1131 of the flexible circuit board 1 not easily come off from the plugging interface of the main control circuit board.

On this basis, as shown in fig. 9, the reinforcing plate 12 is provided with at least one second fixing hole 121, and the at least one second fixing hole 121 is in one-to-one correspondence with the at least one first fixing hole 1102.

Illustratively, the first fixing hole 1102 is a kidney-shaped hole (shown in fig. 7), a circular hole or a square hole, and the second fixing hole 112 is a kidney-shaped hole (shown in fig. 9), a circular hole or a square hole. It is understood that the shapes of the first fixing hole 1102 and the second fixing hole 112 in the present disclosure are various, and only some examples are provided above for illustration.

In some embodiments, as shown in fig. 10 and 11, the plug extension 113 is parallel to the second edge a₂Of the direction X of (A) and a maximum dimension R in the direction X of (B)₁Parallel to the second edge a with the plug-in extension 113₂Of the direction X of (A) is a minimum dimension R₂The ratio therebetween is greater than or equal to 1 and less than or equal to 2. This allows the width of the plug (the width of the plug being such that the plug end 113 is parallel to the second edge a)₂Has a dimension R in the direction X of₂It can be understood that the plugging width is determined by the number of the third pins 1132 on the plugging end 1131, i.e. the larger the number of the third pins 1132, the larger the plugging width), while the plugging extension 113 is reduced to be parallel to the second edge a₂Of the direction X of (A) and a maximum dimension R in the direction X of (B)₁Thereby being beneficial to reducing the overall quality of the plug extension part 113 under the condition of a certain plug width. The acting force generated by the inserting extension part 113 is positively correlated with the overall quality of the inserting extension part 113, and the inserting extension partThe torque of the extension portion 113 is positively correlated to the acting force generated by the inserting extension portion 113, so that the torque of the inserting extension portion 113 can be reduced by reducing the overall mass of the inserting extension portion 113, that is, the torque of the inserting end 1131 can be correspondingly reduced, and thus, after the flexible circuit board 1 is inserted and connected with the main control circuit board in the display device, the inserting end 1131 of the inserting extension portion 113 is not easy to be separated from the inserting interface of the main control circuit board.

In this embodiment, it should be noted that the flexible circuit board 1 may include a second extension portion 112, as shown in fig. 10; the second extension portion 112 may not be included, that is, the flexible circuit board 1 in this embodiment may only include the circuit board main body 110, the first extension portion 111 and the plug extension portion 113, as shown in fig. 11. And whether the above-mentioned embodiment includes the second extension part 112 or not, it can be parallel to the second edge a by the insertion extension part 113₂Of the direction X of (A) and a maximum dimension R in the direction X of (B)₁Parallel to the second edge a with the plug-in extension 113₂Of the direction X of (A) is a minimum dimension R₂The ratio between the two is greater than or equal to 1 and less than or equal to 2, so that the overall mass of the plug extension part is reduced, the torque of the plug extension part 113 can be reduced, and the plug end 1131 of the plug extension part 113 is prevented from being separated from the plug interface of the main control circuit board.

Here, in the case that the flexible circuit board 1 does not include the second extension portion 112, referring to fig. 11, the circuit board main body 110, the first extension portion 111, and the plug extension portion 113 are the substrate base 11 formed integrally. Illustratively, the substrate 11 is a polyimide flexible substrate.

In some embodiments, as shown in fig. 12, a portion 1133 of the plug extension 113, except for the plug end 1131, extends from an end close to the circuit board main body 110 to an end far away from the circuit board main body 110, and is parallel to the second edge a₂Gradually decreases in size in the direction X. Due to the design, the circuit elements in the element mounting area 1101 are conveniently communicated with the third pin 1132 of the plugging end 113 through the conductive wire, and the situation that the conductive wire needs to be bent for multiple times to mount the element due to the excessively complicated shape of the plugging extension part is avoidedThe circuit elements in the region 1101 are communicated with the pins of the plug-in terminal 113, so that the phenomenon that the conductive wire is broken off in the whole bending process of the flexible circuit board due to too many times of bending or too large bending angle of the conductive wire is not easy to occur.

In some embodiments, as shown in fig. 13, the plug extension 113 includes a first portion 1134, one end of the first portion 1134 is connected to the circuit board main body 110, the other end of the first portion 1134 is a plug end 1131, and the first portion 1134 is rectangular, for example, the first portion 1134 extends from an end close to the circuit board main body 110 to an end far from the circuit board main body 110, and is parallel to the second edge a₂Is constant in size in the direction X. Due to the design, the overall mass of the plug extension portion 113 can be greatly reduced, so that the acting force generated by the plug extension portion 113 in a motion state can be reduced, that is, the torque of the plug extension portion 113 is also reduced, and the torque of the plug end 1131 of the plug extension portion 113 is also correspondingly reduced, so that after the flexible circuit board 1 is in plug connection with a main control circuit board in a display device, the plug end 1131 of the plug extension portion 113 is not easy to be separated from a plug interface of the main control circuit board.

In some embodiments, as shown in fig. 13, two opposing edges (e.g., edge a) of the first portion 1134 extending from the mating end 1131 toward the circuit board body 110₃) And a second edge a₂Are perpendicular to each other. Therefore, after the plugging end 1131 of the flexible circuit board 1 is plugged and connected with the plugging interface on the main control circuit board of the display device, the connection is more stable and is not easy to be separated from the plugging interface.

Illustratively, as shown in fig. 7 and 13, the plugging direction Y of the plugging end 1131 is perpendicular to the second edge a₂The central axis of the inserting end 1131 along the inserting direction is L₃(i.e., passing through the center O of the spigot end₀And an axis parallel to the plugging direction Y) divides the plugging extension 113 into a first region P₁And a second region P₂. The inventor of the present disclosure found through research that: first region P₁Center O of₃₁A force F perpendicular to the plane of the plug extension 113 is generated₁₁And the first region P₁Is positively correlated with the quality of the first region P₁Torque ofAnd the first region P₁Center O of₃₁The force F generated at the position is vertical to the plane of the plug extension part₁₁Positive correlation; second region P₂Center O of₃₂The force F generated at the position is vertical to the plane of the plug extension part₁₂And the first region P₂Is positively correlated with the quality of the second region P₂Torque and second region P₂Center O of₃₂A force F perpendicular to the plane of the plug extension 113 is generated₁₂And (4) positively correlating. Note that the first region P is₁Center O of₃₁And a second region P₂Center O of₃₂Refer to the respective centers of mass, i.e. the positions at which the respective centers of gravity are located.

Based on this, see fig. 13, in a direction parallel to the second edge a₂In the direction X of the connecting line, the midpoint O of said connecting line₄To the center O of the spigot end 1131₀With a zero pitch between them, the first region P₁And the second region P and the rotating shaft corresponding to the torque₂The rotating shafts corresponding to the torque are all L₃. In this case, the plug extension 113 comprises only a first portion 1134, a first region P₁And a second region P₂Are equal in area, i.e. the first region P₁And a second region P₂Is equal, in the motion state, the first region P₁And the second region P and the force at the center of₂Is equal and the first region P₁From the center to the rotation axis L₃And the second region P₂From the center to the rotation axis L₃Are equal, and thus, the first region P₁And the second region P₂The torque of the main control circuit board is equal, so that the problem that the plugging end 1131 is easily separated from the plugging interface of the main control circuit board can be better solved.

In some embodiments, as shown in fig. 14, the plug extension 113 further includes a second portion 1135, the second portion 1135 is located at the first portion 1134 along a direction parallel to the second edge a₂On either of two opposite sides of the direction X, the second portion 1135 is connected to the edge of the first portion 1134 and the second edge a₂. So designed as to be in the first placeThe conductive wires connecting the circuit elements in the element mounting region 1101 and the pins (i.e., the third pins 1132) of the mating end 1131 are disposed on the two portions 1135, so that the phenomenon that the conductive wires are easily broken during the movement of the flexible circuit board 1 due to an excessively large bending angle of the conductive wires is not easily generated.

Illustratively, as shown in FIG. 14, along a line parallel to the second edge a₂The second portion 1135 is located on a side of the first portion 1134 away from the first extension 111 (e.g., located in the second region P)₂Away from the first region P₁To facilitate the arrangement of the conductive lines.

On this basis, for example, as shown in fig. 14, the second portion 1135 is located at the interface between the first portion 1134 and the circuit board main body 110, so that the conductive wire can be arranged along the edge of the second portion 1135, which makes the conductive wire less prone to generating a right angle and breaking during the bending process of the flexible circuit board 1.

Illustratively, as shown in fig. 14, the second portion 1135 has a triangular shape, i.e., an orthographic projection of the second portion 1135 in a reference plane parallel to the circuit board body has a triangular shape. At this time, the conductive line may be along the oblique side a parallel to the second portion 1135₄The conductive wires are not easy to be right-angled, and the conductive wires are not easy to break under the condition that the flexible circuit board 1 is bent. The second portion 1135 having a triangular shape has a stable mechanical effect, so that the stability of the flexible circuit board 1 can be improved.

In some embodiments, as shown in fig. 15, the plug extension 113 further includes a third portion 1137, the third portion 1137 is located at the first portion 1134 along a direction parallel to the second edge a₂Is directed along the other of the two opposite sides of the direction X (i.e. along a direction parallel to the second edge a)₂The third portion 1137 is located at a side of the first portion 1134 close to the first extension 111), the third portion 1137 is connected to the edge of the first portion 1134 and the second edge a₂. In this way, the conductive wire can be arranged along the edge of the third portion 1137, so that the conductive wire is not easily subjected to right angle, and the conductive wire is not easily broken during the bending process of the flexible circuit board 1.

Illustratively, as shown in fig. 15, the third portion 1137 has a triangular shape, i.e., an orthographic projection of the third portion 1137 in a reference plane parallel to the circuit board body has a triangular shape. At this time, the conductive line may be arranged in a direction parallel to the oblique side of the third portion 1137, which makes the conductive line less prone to a right angle, and the conductive line is less prone to break in the case where the flexible circuit board 1 is bent. The triangular third portion 1137 has a stable mechanical effect, so that the stability of the flexible circuit board 1 can be improved.

The second portion 1135 and the third portion 1137 may be provided at the same time, or only one of them may be provided.

Referring to fig. 7 and 15, the second edge a is parallel to the first edge₂In the direction X of the connecting line, the midpoint O of said connecting line₄At the center O of the inserting end 1131₀Center O with first binding end 1111₁In between, illustratively, as shown in FIG. 15, only the third portion 1137 is disposed, i.e., the third portion 1137 is disposed at the midpoint O of the first portion 1134 near the connecting line₄At this time, with the central axis L₃As a boundary, the midpoint O of the plug extension 113 near the connection line₄Has a greater mass than the midpoint O of the plug extension 113 remote from the connection line₄I.e. the midpoint O of the plug extension 113 near the connection line₄Is greater than the midpoint O of the plug extension 113 away from the connection line₄The force generated by the part of (a). At the same time, the midpoint O of the plug-in extension 113 near the connection line₄Center of part (a) O₃₁The rotation axis L corresponding to the torque to the part₂Is less than the midpoint O of the plug extension 113 away from the connection line₄Center of part (a) O₃₂The rotation axis L corresponding to the torque to the part₂Thus, it is advantageous to have the plug extension 113 near the midpoint O of the connection line₄With the midpoint O of the plug extension 113 away from the connection line₄Are equal or close in torque, thereby improving the ease with which the plug end 1131 of the plug extension 113 can be easily removed from the master controlThe problem of separation in the plug-in interface of the circuit board.

For example, as shown in fig. 14 and 15, two opposite sides of the inserting end 1131 along a direction parallel to the second edge are respectively provided with a positioning protrusion 1136, and the inserting end 1131 can be clamped in the inserting interface of the main control circuit board through the positioning protrusions 1136, so that the connection reliability is improved.

In some embodiments, as shown in fig. 16, the boundary of the component mounting region 1101 is the second edge a₂A distance R therebetween₃Greater than or equal to 14mm and less than or equal to 18 mm. Due to the design, after the area of the plug extension 113 is reduced, the conductive wire is convenient for connecting the circuit element in the element mounting area 1101 and the pin of the plug end 1131, and a large break angle of the conductive wire is not easy to occur due to an excessively small wiring area of the element mounting area 1101 close to one side of the plug extension 113, so that the conductive wire is not easy to break in the bending process of the flexible circuit board 1. Illustratively, the boundary of the component mounting region 1101 is the second edge a₂A distance R therebetween₃14mm, 15mm, 16mm, 17mm or 18 mm. At the boundary of the component mounting region 1101 and the second edge a₂A distance R therebetween₃When the thickness is equal to or close to 14mm, the overall mass of the flexible circuit board 1 is small, and the flexible circuit board is not easy to bend after being installed on a display device; at the boundary of the component mounting region 1101 and the second edge a₂A distance R therebetween₃Equal to or close to 18mm, the component mounting area and the second edge a₂The larger distance therebetween facilitates the arrangement of conductive wires for connecting the circuit components in the component mounting region 1101 with the pins of the mating terminals 1131.

Referring to fig. 17, some embodiments of the present disclosure provide a display panel 2 including a substrate and a second circuit, a first bonding pad 21, and a second bonding pad 22 disposed on the substrate, the first bonding pad 21 being electrically connected to the second circuit, and the second bonding pad 22 not being electrically connected to the second circuit. By such a design, after the at least one second pin 1122 of the second binding end 1121 of the flexible circuit board 1 is bound to the second binding pad 22 of the display panel 2, the at least one second pin 1122 is only mechanically connected to the second binding pad 22, and the at least one second pin 1122 is electrically disconnected from the second circuit of the display panel, i.e., the second binding pad 22 is only configured to fix the second binding end 1121 of the flexible circuit board 1, so as to improve the problem that the plugging end 1131 is easily separated from the plugging interface of the main control circuit board, and the original circuit structures of the display panel 2 and the flexible circuit board 1 are not affected, thereby facilitating the production and manufacturing of the display panel 2 and the flexible circuit board 1.

In some examples, as shown in fig. 17, the display panel 2 includes a liquid crystal module 23 and a backlight 24, the liquid crystal module 23 is installed in the backlight 24, and then the liquid crystal module 23 is installed in the cavity of the fixed structure together with the backlight 24. In other examples, the display panel includes an organic light emitting diode display panel having a self-light emitting function without the backlight 24. At this time, the oled display panel is directly mounted in the cavity of the fixing structure 22.

Referring to fig. 18, some embodiments of the present disclosure provide a display device 3, where the display device 3 includes a main control circuit board 31, a display panel 2 as described in any of the above embodiments, and a flexible circuit board 1 as described in any of the above embodiments. The main control circuit board 31 has a plug interface, the plug end 1131 of the flexible circuit board 1 is inserted into the plug interface, the pin (i.e., the first pin 1112 shown in fig. 8) of the first binding end 1111 of the flexible circuit board 1 is bound to the first binding pad 21 of the display panel 2, and the pin (i.e., the second pin 1122 shown in fig. 8) of the second binding end 1121 of the flexible circuit board 1 is bound to the second binding pad 22 of the display panel 2.

Referring to fig. 19, some embodiments of the present disclosure provide another display device 3, where the display device 3 includes a main control circuit board 31, a display panel 2A, and a flexible circuit board 1 as in any of the above embodiments. The main control circuit board 31 has a plug interface thereon, the display panel 2A includes a first binding pad 21, the plug end socket 1131 of the flexible circuit board 1 is connected in the plug interface, and a pin (i.e., the first pin 1112 shown in fig. 8) of the first binding end 1111 of the flexible circuit board 1 is bound to the first binding pad 21 of the display panel 2.

Illustratively, as shown in fig. 21, the fixing structure 32 is provided with a mounting cavity 321, and both the display panel 2 shown in fig. 17 and the display panel 2A shown in fig. 20 can be mounted in the mounting cavity 321. For example, one of the display panel and the fixing structure 32 is provided with an elastic clamping table, and the other is provided with an elastic buckle, so that the elastic clamping table and the elastic buckle are clamped by pressing, and the display panel is clamped and fixed in the mounting cavity 321 of the fixing structure 32. For another example, a double-sided tape is disposed between the display panel and the fixing structure 32, and the display panel is fixed in the mounting recess 321 of the fixing structure 32 by bonding with the double-sided tape.

In this regard, as shown in fig. 21, an avoidance groove 322 is provided on a side wall of the mounting cavity 221. The avoidance groove 322 is configured to pass the first binding end 1111 of the flexible circuit board 1, or the avoidance groove 322 is configured to pass the second binding end 1121 of the flexible circuit board 1, or the avoidance groove 322 is configured to pass the first binding end 1111 and the second binding end 1121 of the flexible circuit board 1.

Referring to fig. 18 and 19, the main control circuit board 31 is disposed on a side of the fixing structure 32 away from the display panel, and the main control circuit board 31 and the fixing structure 32 are fixed relatively. It should be noted that there are various ways of fixing the main control circuit board 31 and the fixing structure 32 relatively, for example, referring to fig. 22, a plurality of first connection holes 324 are provided on the fixing structure 32, at this time, a plurality of second connection holes are provided on the main control circuit board 31 shown in fig. 18 and 19, the plurality of second connection holes correspond to the plurality of first connection holes 324 one by one, and one first connection hole 324 and one second connection hole which are correspondingly provided are connected through a connector (for example, a screw and a bolt), so that the main control circuit board 31 and the fixing structure 32 are relatively fixed. Illustratively, as shown in fig. 22, four first connection holes 324 are provided on the fixing structure 32, and correspondingly, four second connection holes are also provided on the main control circuit board 31 shown in fig. 18 and 19, and the four second connection holes are arranged in one-to-one correspondence with the four first connection holes 324.

For example, as shown in fig. 21, at least one third fixing hole 323 is further disposed on the fixing structure 32, the at least one third fixing hole 323 corresponds to at least one first fixing hole 1102 on the circuit board main body 110 shown in fig. 7 one-to-one, and the flexible circuit board 1 can be fixed on the fixing structure 32 by passing each connector (e.g., a screw) through the corresponding first fixing hole 1102 and one third fixing hole 323, so as to further improve the reliability of the display device 3, and make the plugging end 1131 of the flexible circuit board 1 not easily fall out of the plugging interface of the main control circuit board.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A flexible circuit board, comprising:

a circuit board body having opposing first and second edges;

the first extending part is connected with the first edge, and the end part, far away from the circuit board main body, of the first extending part is a first binding end;

the end part of the plug-in extension part, which is far away from the circuit board main body, is a plug-in end;

the second extending part is connected with the first edge, and the end part, far away from the circuit board main body, of the second extending part is a second binding end;

wherein a midpoint of a connecting line between a center of the second binding end and a center of the first binding end, in a direction parallel to the second edge, is located between a center of the splicing end and a center of the first binding end; or,

the center of the first binding end and the center of the second binding end are symmetrical about a connecting line between the center of the plugging end and the midpoint of the connecting line.

2. The flexible circuit board of claim 1, wherein an edge of the second extension portion adjacent to the first extension portion is connected to an edge of the first extension portion adjacent to the second extension portion.

3. The flexible circuit board of claim 1, wherein a dimension of the second extension in a direction parallel to the second edge is greater than or equal to 10mm and less than or equal to 15 mm.

4. The flexible circuit board according to any one of claims 1 to 3, wherein a ratio between a maximum dimension of the plug extension in a direction parallel to the second edge and a minimum dimension of the plug extension in a direction parallel to the second edge is greater than or equal to 1 and less than or equal to 2.

5. The flexible circuit board according to any one of claims 1 to 3, wherein a dimension of a portion of the plug extension other than the plug end in a direction parallel to the second edge is gradually reduced from an end close to the circuit board main body to an end away from the circuit board main body.

6. The flexible circuit board of any one of claims 1 to 3, wherein the plug extension comprises:

one end of the first part is connected with the circuit board main body, and the other end of the first part is the inserting end; the first portion is rectangular in shape.

7. The flexible circuit board of claim 6, wherein two opposing edges of the first portion extending from the mating end to the circuit board body are perpendicular to the second edge.

8. The flexible circuit board of claim 6, wherein the plug extension further comprises:

a second portion, and/or the second portion is located on one of two opposite sides of the first portion in a direction parallel to the second edge;

the second portion is connected to an edge of the first portion and the second edge.

9. The flexible circuit board of claim 8, wherein the plug extension further comprises:

a third portion located on the other of the opposite sides of the first portion in a direction parallel to the second edge;

the third portion is connected to an edge of the first portion and the second edge.

10. The flexible circuit board of claim 9, wherein the second portion is triangular in shape; and/or the third portion is triangular in shape.

11. The flexible circuit board according to any one of claims 1 to 3, wherein the circuit board main body has a component mounting area thereon; the distance between the boundary of the component mounting region and the second edge is greater than or equal to 14mm, and less than or equal to 18 mm.

12. The flexible circuit board according to any one of claims 1 to 3, further comprising:

the first circuit is arranged on one side of the circuit board main body;

at least one first pin, which is arranged at the first binding end and is electrically connected with the first circuit;

at least one second pin disposed at the second binding end;

and the at least one third pin is arranged at the plug end and is electrically connected with the first circuit.

13. A display device, comprising:

a display panel including a first binding pad and a second binding pad;

the flexible circuit board of any one of claims 1 to 12, wherein a pin of a first bonding end of the flexible circuit board is bonded to a first bonding pad of the display panel, and a pin of a second bonding end of the flexible circuit board is bonded to a second bonding pad.