Flexible circuit board

Abstract

The utility model discloses a flexible circuit board. The flexible circuit board comprises a circuit board main body, the circuit board main body comprises a first main body area, a bending area and a second main body area; the bending area is connected to the side edge of the first main body area, and the second main body area is connected with the first main body area through the bending area; when the flexible printed circuit board is used, the bending area sets an angle through bending so as to guide the second main body area to be in positioning connection with the backlight or back PET of the display screen, the hardness of the bending area of the FPC can be reduced through the windowing part on the front face, and the flexible printed circuit board is different from a flexible printed circuit board in the prior art. Therefore, the strength of the bending area on the circuit board main body is reduced, the reverse stress is reduced, and the phenomenon that the FPC rebounds and warps after being assembled is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to display screen field especially involves a kind of flexible circuit board. BACKGROUND

[0002] Display screen module is an electronic module integrating display screen, driving circuit, backlight module and other key components, and is widely used in various electronic devices, such as smart phones, tablet computers, notebook computers, vehicle-mounted display screens, etc.

[0003] Display screen module is mainly composed of the following parts: display screen, including liquid crystal display (LCD) or organic light-emitting diode display (OLED), responsible for displaying images. Driving circuit: responsible for controlling the display content of the display screen, including signal processing, driving signal generation, etc. Backlight module: provides the backlight required by the display screen, so that the image can be clearly displayed in the dark. FPC (Flexible Printed Circuit Board): connects the driving circuit and the display screen, responsible for signal transmission.

[0004] In the production process of display screen module, FPC needs to be bent to the screen backlight or back PET. This step is to ensure that FPC can be correctly connected to the display screen and driving circuit to realize signal transmission.

[0005] For example, the patent document with the application number CN202220737848.2 discloses a display screen module, a display device and an electronic equipment, which includes a cover plate layer, an optical adhesive layer, a TFT glass layer and a backlight. The optical adhesive layer is arranged between the cover plate layer and the TFT glass layer. The backlight is arranged on the back of the TFT glass layer. The backlight includes FPC and a backlight rear shell glue frame. The FPC includes main FPC and backlight FPC. The FPC is bent and attached to the inside of the rear shell glue frame. The FPC also has a protruding part that protrudes from the inside of the rear shell glue frame. The protruding part is connected to the TFT glass layer. The display screen module of the utility model embodiment greatly saves resources through the design of FPC including main FPC and backlight FPC. It avoids the process of welding the existing main FPC and backlight FPC again. The FPC is arranged inside the backlight, and the design of the backlight rear shell glue frame surrounding the FPC protects the bent part of the FPC well.

[0006] The above patent document discloses a technology scheme for bending FPC, which can protect the bent part of FPC, but has certain limitations in specific use, as follows:

[0007] Because the module product delivery needs to bend the FPC to the display screen backlight or the back PET, the FPC after bending will be subjected to the reverse stress, the stress is proportional to the FPC thickness / hardness, and the reverse stress will cause the FPC to rebound and rise after assembly, thereby failing to meet the customer's whole machine structure requirements, resulting in quality failure and customer complaints.

[0008] Therefore, how to solve the above-mentioned problems in the prior art has become a research topic to be solved by the utility model. Utility model content

[0009] Therefore, it is necessary to provide a flexible circuit board in view of the technical problems in the above background technology that because the module product delivery needs to bend the FPC to the display screen backlight or the back PET, the FPC after bending will be subjected to the reverse stress, the stress is proportional to the FPC thickness / hardness, and the reverse stress will cause the FPC to rebound and rise after assembly, thereby failing to meet the customer's whole machine structure requirements, resulting in quality failure and customer complaints.

[0010] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0011] A flexible circuit board, comprising a circuit board main body;

[0012] The circuit board main body comprises a first main body area, a bending area and a second main body area;

[0013] The bending area is connected to the side edge of the first main body area, and the second main body area is connected to the first main body area through the bending area; in use, the bending area is bent to a certain angle to guide the second main body area to be positioned and connected with the display screen backlight or the back PET;

[0014] The bending area has a front surface and a back surface;

[0015] The front surface is provided with a window part.

[0016] In the above scheme, the window part on the front surface can reduce the hardness of the FPC bending area, which is different from the flexible circuit board in the prior art. The window part is arranged on the front surface in the embodiment, so that the thickness of the FPC is reduced, and therefore the strength of the bending area on the circuit board main body is reduced, and the reverse stress is reduced, thereby avoiding the phenomenon that the FPC rebounds and rises after assembly.

[0017] Further, the back surface has a softening layer, and the softening layer is arranged in matching with the bending area.

[0018] Further, the window part is a rectangular structure through hole, and at least two through holes are arranged, and the existence of the through hole can bring better softening effect.

[0019] Further, the adjacent through holes have conductor areas for conducting lines.

[0020] Further, the through hole and the edge of the circuit board body in the height direction are at a set angle, which can be between 0 and 90, so that the strength of the bending area 2 is reduced, that is, the stress is also reduced.

[0021] Further, the through hole and the edge of the circuit board body in the height direction are at an acute angle or parallel state.

[0022] The through hole is provided with a connecting piece.

[0023] Further, when the through hole and the edge of the circuit board body in the height direction are at an acute angle,

[0024] The connecting piece is a long connecting strip, and the two ends of the connecting strip are connected to the center of the edge in the length direction of the through hole.

[0025] Further, the center of the connecting strip is provided with a reinforcing block, which can enhance the strength and stability of the connecting strip. Since the length of the connecting strip on the circuit board body can be relatively long, the reinforcing block can prevent the connecting strip from bending or deforming due to the excessive length, thereby ensuring the continuity and reliability of the circuit. At the same time, the reinforcing block at the center of the connecting strip can prevent the center of the connecting strip from being broken.

[0026] Further, when the through hole and the edge of the circuit board body in the height direction are at a parallel state, the connecting piece includes a fixed strip arranged in the through hole, the through hole has four peripheral surfaces, and the two opposite peripheral surfaces of the through hole are provided with expansion blocks connected with the fixed strip.

[0027] The center of the expansion block is provided with a center block, and two auxiliary expansion blocks are arranged on the center block and are positioned and connected with the other two peripheral surfaces of the through hole.

[0028] Further, the length of the expansion block is equal to the width of the through hole.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] The utility model can reduce the hardness of the FPC bending area through the window part on the front face, which is different from the flexible circuit board of the prior art. The window part is arranged on the front face, so that the thickness of the FPC is reduced, and the strength of the bending area on the circuit board body is reduced, and the reverse stress is reduced, thereby avoiding the phenomenon of FPC rebounding after assembly. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The through hole structure schematic view provided by the utility model is shown in the figure.

[0032] Figure 2 The softening layer structure schematic view is provided for the utility model;

[0033] Figure 3 The reinforcing block structure schematic view is provided for the utility model;

[0034] Figure 4 The auxiliary expansion block structure schematic view is provided for the utility model.

[0035] The figure mark explanation is as follows:

[0036] 1, first main body area, 2, bending area, 3, second main body area, 4, front, 5, back, 6, softening layer, 7, through hole, 8, connecting strip, 9, reinforcing block, 10, fixed strip, 11, expansion block, 12, center block, 13, auxiliary expansion block. DETAILED DESCRIPTION

[0037] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely in the embodiment of the utility model below, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor should belong to the protection scope of the utility model.

[0038] Because the module product delivery needs to bend FPC to the display screen backlight or back PET, the FPC after bending will be subjected to reverse stress, and the stress is proportional to the thickness / hardness of FPC, and the reverse stress will cause the FPC to rebound and rise after assembly, so as to meet the customer's whole machine structure requirement, resulting in quality failure and customer complaint problem.

[0039] In order to solve this technical problem, the utility model provides a flexible circuit board.

[0040] Specifically, please refer to Figures 1-4 Flexible circuit board, including circuit board main body;

[0041] The circuit board main body includes first main body area 1, bending area 2 and second main body area 3;

[0042] The bending area 2 is connected to the side of the first main body area 1, and the second main body area 3 is connected to the first main body area 1 through the bending area 2;When using, the bending area 2 is bent to set angle to guide the second main body area 3 and display screen backlight or back PET positioning connection;

[0043] The bending area 2 has front 4 and back 5.

[0044] The front face 4 is provided with a windowed portion.

[0045] The back PET (polyethylene terephthalate) is a kind of protective material commonly used in electronic display screen module.

[0046] The utility model discloses a windowed portion of the front face 4 can reduce the hardness of FPC bending area, unlike the flexible circuit board of prior art, the windowed portion of the front face 4 of the embodiment is set, so that the thickness of FPC reduces, and therefore the strength of the bending area 2 on the circuit board main body reduces, and the reverse stress will reduce, thereby the phenomenon of FPC rebounding after assembly is avoided.

[0047] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings.

[0048] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0049] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0050] The flexible circuit board comprises a circuit board main body;

[0051] The circuit board main body comprises a first main body area 1, a bending area 2 and a second main body area 3;

[0052] The bending area 2 is connected to the side edge of the first main body area 1, and the second main body area 3 is connected to the first main body area 1 through the bending area 2; when used, the bending area 2 is bent to set an angle to guide the second main body area 3 to be positioned and connected with the display screen backlight or back PET;

[0053] The bending area 2 has a front face 4 and a back face 5;

[0054] The front face 4 is provided with a windowed portion.

[0055] The back PET (polyethylene terephthalate) is a kind of protective material commonly used in electronic display screen module.

[0056] The utility model discloses a windowed portion of the front face 4 can reduce the hardness of FPC bending area, unlike the flexible circuit board of prior art, the windowed portion of the front face 4 of the embodiment is set, so that the thickness of FPC reduces, and therefore the strength of the bending area 2 on the circuit board main body reduces, and the reverse stress will reduce, thereby the phenomenon of FPC rebounding after assembly is avoided.

[0057] In some embodiments, the back surface 5 has a softening layer 6, which is arranged in matching with the bending area 2, and the softening layer 6 is a bending softening filter area.

[0058] The window part can also be a ring groove, for example, a HuaXing open with an opening.

[0059] In some embodiments, the window part is a rectangular structure through hole 7, and at least two through holes 7 are arranged. The presence of the through hole 7 can bring better softening effect.

[0060] In some embodiments, the adjacent through holes 7 have a wire area. The wire area is used for wiring.

[0061] In some embodiments, the through hole 7 is arranged at a set angle with the edge of the circuit board body height direction.

[0062] The set angle can be between 0-90, so that the strength of the bending area 2 is reduced, that is, the stress is also reduced.

[0063] In some embodiments, the through hole 7 is arranged at an acute angle or parallel state with the edge of the circuit board body height direction.

[0064] The through hole 7 is provided with a connecting piece.

[0065] Because the presence of the through hole 7 makes the inside corner of the through hole 7 easy to tear when the bending area 2 is bent, so the connecting piece makes the strength of the through hole 7 not affected.

[0066] In some embodiments, when the through hole 7 is arranged at an acute angle with the edge of the circuit board body height direction,

[0067] The connecting piece is a long strip-shaped connecting strip 8, and the two ends of the connecting strip 8 are connected to the center of the edge in the length direction of the through hole 7.

[0068] The two ends of the connecting strip 8 are connected to the center of the edge in the length direction of the through hole 7, which can ensure that the fixed position of the connecting strip 8 on the circuit board body is uniform, which helps to maintain the stability of the circuit and the reliability of signal transmission. At the same time, it can also ensure that the strength of the two sides of the through hole 7 is sufficient, and the bending or distortion phenomenon will not appear.

[0069] In some embodiments, the center of the connecting strip 8 is provided with a reinforcing block 9, which can enhance the strength and stability of the connecting strip 8. Because the length of the connecting strip 8 on the circuit board body can be relatively long, the reinforcing block 9 can prevent the connecting strip 8 from bending or deforming due to the length being too long, thereby ensuring the continuity and reliability of the circuit.

[0070] The reinforcing block 9 at the center of the connecting strip 8 can prevent the center of the connecting strip 8 from being broken when the flexible circuit board is played.

[0071] In some embodiments, the through hole 7 is in an acute angle state or a parallel state with the edge of the height direction of the circuit board body.

[0072] The through hole 7 is provided with a connecting piece.

[0073] The through hole 7 is provided with a connecting piece.

[0074] However, once the length of the connecting piece is too long, the end part is also prone to breakage.

[0075] In some embodiments, when the through hole 7 is in a parallel state with the edge of the height direction of the circuit board body, the connecting piece comprises a fixing strip 10 arranged in the through hole 7, the through hole 7 has four peripheral surfaces, and the opposite two peripheral surfaces of the through hole 7 are provided with expansion blocks 11 connected with the fixing strip 10.

[0076] The center of the expansion block 11 is provided with a center block 12, and the center block 12 is provided with two auxiliary expansion blocks 13 arranged in position and connected with the other two peripheral surfaces of the through hole 7.

[0077] In some embodiments, the length of the expansion block 11 is equal to the width of the through hole 7.

[0078] When the bending area 2 is bent, the expansion block 11 makes the strength of the fixing strip 10 sufficient, and the length of the expansion block 11 is equal to the width of the through hole 7, so that tearing phenomenon can be prevented at the peripheral surface of the through hole 7 and the expansion block 11.

[0079] Meanwhile, when the bending area 2 is bent, the fixing strip 10 has the same effect as the connecting strip 8, and then, when the fixing strip 10 is bent, the center block 12 can have sufficient strength to prevent the fixing strip 10 from being broken, and after the fixing strip 10 is bent, the auxiliary expansion block 13 can also have a protection effect to prevent the center block 12 from shaking.

[0080] The use process of the flexible circuit board provided by the utility model is as follows:

[0081] The utility model can reduce the hardness of the FPC bending area through the window part of the front surface 4, and is different from the flexible circuit board of the prior art. The window part is arranged on the front surface 4, so that the thickness of the FPC is reduced, and the strength of the bending area 2 on the circuit board body is reduced, the reverse stress is reduced, and the phenomenon of FPC rebounding and warping after assembly is avoided.

[0082] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element mutual action relation, unless another definite limitation.For ordinary skilled person in the art, can understand the above terms in the utility model specific meaning according to specific circumstances.

[0083] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, and not all the embodiments, the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model.The utility model can be realized in many different forms, and contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.Although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing each specific embodiment can be modified, or part of the technical features can be replaced equivalently.For equivalent structures made by using the contents of the utility model specification and drawings, direct or indirect application in other related technical fields, are also within the patent protection scope of the utility model.

Claims

1. A flexible circuit board, characterized in that, Including the main body of the circuit board; The circuit board body includes a first main body area (1), a bending area (2), and a second main body area (3); The bending area (2) is connected to the side of the first main body area (1), and the second main body area (3) is connected to the first main body area (1) through the bending area (2); in use, the bending area (2) is bent at a set angle to guide the second main body area (3) to be positioned and connected to the backlight of the display screen or the back (5) PET. The bending area (2) has a front (4) and a back (5); The front (4) is provided with a window.

2. The flexible circuit board according to claim 1, characterized in that, The back side (5) has a softening layer (6) that is matched with the bending area (2).

3. The flexible circuit board according to claim 1, characterized in that, The opening portion is a rectangular through hole (7), and at least two through holes (7) are provided.

4. The flexible circuit board according to claim 2 or 3, characterized in that, There is a conductor zone between adjacent through holes (7).

5. The flexible circuit board according to claim 4, characterized in that, The through hole (7) is at a set angle to the edge of the circuit board body in the height direction.

6. The flexible circuit board according to claim 5, characterized in that, The through hole (7) is at an acute angle or parallel to the edge of the circuit board body in the height direction; A connector is provided inside the through hole (7).

7. The flexible circuit board according to claim 6, characterized in that, When the through hole (7) forms an acute angle with the side of the circuit board body in the height direction, The connector is a long strip (8), and the two ends of the connector (8) are connected to the center of the side along the length of the through hole (7).

8. The flexible circuit board according to claim 7, characterized in that, The connecting strip (8) has a reinforcing block (9) at its center.

9. The flexible circuit board according to claim 6, characterized in that, When the through hole (7) is parallel to the edge of the circuit board body in the height direction, the connector includes a fixing strip (10) disposed in the through hole (7). The through hole (7) has four peripheral surfaces, and each of the two opposite peripheral surfaces in the through hole (7) is provided with an extension block (11) connected to the fixing strip (10). The center of the extension block (11) is provided with a central block (12), and the central block (12) is provided with two auxiliary expansion blocks (13). The two auxiliary expansion blocks (13) are positioned and connected to the other two peripheral surfaces of the through hole (7).

10. The flexible circuit board according to claim 9, characterized in that, The length of the extension block (11) is equal to the width of the through hole (7).

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