Flexible circuit board welding structure

Abstract

The utility model discloses a flexible circuit board welding structure, a flexible circuit board comprises a backlight circuit board and a display screen circuit board, one end of the backlight circuit board is connected with backlight, a display panel is arranged on the backlight, the display screen circuit board is connected with the display panel, the other end of the backlight circuit board is connected with the display screen circuit board, and the display screen circuit board is connected with the display panel. The display screen circuit board comprises a main body, the main body is provided with a fixed end and a movable end, and the fixed end is connected with a display panel; the main body is provided with a welding area, the surface of the welding area is fixedly connected with the backlight circuit board, an isolation area is arranged on the surface of the main body along the edge of the welding area, and the isolation area is used for separating the welding area from the movable end. Even if the backlight circuit board and the display screen circuit board need to be bent during assembly, the welding area is not pulled due to the fact that the welding area is separated from the movable end, and meanwhile heat generated during welding can be isolated.

Description

Technical Field

[0001] The utility model relates to the field of display screens, and particularly relates to a flexible circuit board welding structure. Background Art

[0002] Generally, a display screen module mainly consists of a liquid crystal display panel and a backlight. Both the liquid crystal display panel and the backlight are connected by FPCs, and among them, the backlight FPC needs to be welded and fixed on the liquid crystal display panel FPC (i.e., the flexible circuit board).

[0003] The representative patent document CN202322400965.7 discloses a backlight FPC welding structure. By arranging the second welding part of the backlight FPC on the back and designing no welding part on the front, it avoids exposed metal traces to reduce the pasting of insulating protective films. At the same time, when the first welding part of the main screen FPC is welded to the second welding part of the backlight FPC, it is connected to the main screen FPC by the method of downward pressing and crimping. Thus, by the crimping method, there is no exposed solder paste, and the first welding part and the second welding part are not exposed, so the pasting of the insulating protective film is not required. Thereby, the material cost is reduced.

[0004] Although the technical solution disclosed in the above patent document reduces the material cost by the crimping method, with no exposed solder paste and the first and second welding parts not being exposed, thus not requiring the pasting of the insulating protective film, there are still limitations in actual work:

[0005] Because the FPC will be bent during the application and assembly of the display screen module, and the backlight FPC will be pulled during the whole process. At this time, the welding position is easily damaged and broken;

[0006] Secondly, the liquid crystal display panel FPC is also a welding interface. If the pad position of the backlight FPC is close to the welding position of the liquid crystal display panel FPC, the heat will be conducted to the welding position of the backlight FPC when welding the liquid crystal display panel FPC, affecting the solder stability of the backlight FPC. Summary of the Utility Model

[0007] Based on this, a flexible circuit board welding structure is provided, aiming to solve the following problems in the above background art: 1. When the display screen module is applied and assembled, the FPC will be bent, and during the whole process, the backlight FPC will be pulled. At this time, the welding position is easily damaged and broken; 2. The liquid crystal display panel FPC is also a welding interface. If the pad position of the backlight FPC is close to the welding position of the liquid crystal display panel FPC, the heat will be conducted to the welding position of the backlight FPC when welding the liquid crystal display panel FPC, affecting the solder stability of the backlight FPC.

[0008] To solve the above technical problems, the utility model adopts the following technical solutions:

[0009] A flexible circuit board welding structure, the flexible circuit board includes a backlight circuit board and a display screen circuit board. One end of the backlight circuit board is connected to the backlight, a display board is provided on the backlight, the display screen circuit board is connected to the display board, and the other end of the backlight circuit board is connected to the display screen circuit board. The display screen circuit board includes:

[0010] A main body having a fixed end and a movable end, the fixed end being connected to the display board; a welding area is provided on the main body, the surface of the welding area is fixedly connected to the backlight circuit board, and along the edge of the welding area, an isolation area is provided on the surface of the main body, and the isolation area is used to separate the welding area from the movable end.

[0011] Further, the isolation area may be a strip structure provided, for example, a metal strip, and all forces are isolated by the metal strip. However, this requires a higher strength for the flexible circuit board. Therefore, with this design, the isolation area is a slotted L-shaped structure.

[0012] Further, a fixing member is provided on the back surface of the welding area for connecting to the surface of the backlight away from the display board.

[0013] Further, the fixing member is a double-sided adhesive. With this design, the welding area can be quickly fixed to the back of the backlight, and no auxiliary operations such as heating are required during the connection process.

[0014] Further, in order to prevent the connection area between the welding area and the backlight from tilting, a guiding portion is provided on the surface of the backlight away from the display board for limiting the connection area between the welding area and the backlight.

[0015] Further, the guiding portion is a groove or a protruding portion.

[0016] Further, when the guiding portion is a groove, the groove is provided along the edge of the welding area connected to the backlight. With this design, the position of the welding area during fixation can be limited, and at the same time, the setting of the backlight is not affected.

[0017] Further, there is a bending portion between the welding area and the fixed end, and the welding area can deflect around one end of the bending portion close to the fixed end until it is connected to the backlight. The bending portion is provided to ensure a sufficient distance between the welding area and the backlight.

[0018] By limiting the connection area between the welding area and the backlight through the guiding portion, when the welding area is pasted on the backlight, it can prevent the bending portion from rubbing against the backlight due to a close distance caused by position offset.

[0019] Further, an anti-scratch strip is provided on the surface of the bending portion.

[0020] Further, the scratch-resistant strip is located on the same side of the fixing member, and the length of the scratch-resistant strip is not less than the width of the bending portion.

[0021] Compared with the prior art, the beneficial effects and principles of the present utility model are as follows:

[0022] The present utility model can separate the welding area from the movable end through the isolation area, so that the welding position exists independently. Even when the backlight circuit board and the display circuit board need to be bent during assembly, since the welding area is separated from the movable end, the welding area will not be pulled, and at the same time, the heat during welding can be isolated.

[0023] During fixation, it can be deflected around one end of the bending portion close to the fixed end until it is connected to the backlight. During connection, the double-sided adhesive can quickly fix the welding area to the back of the backlight, and no auxiliary operations such as heating are required during the connection process. At the same time, the guiding portion can limit the position of the welding area during fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a display circuit board in the prior art;

[0025] Figure 2 is a schematic side view structural diagram of a display circuit board in the prior art;

[0026] Figure 3 is a schematic structural diagram of a display circuit board provided by the present utility model;

[0027] Figure 4 is a schematic structural diagram of the double-sided adhesive provided by the present utility model;

[0028] Figure 5 is a schematic structural diagram of the welding area during fixation provided by the present utility model;

[0029] Figure 6 is a schematic structural diagram of the guiding portion provided by the present utility model;

[0030] Figure 7 is a schematic structural diagram of the welding area being limited by the guiding portion during fixation provided by the present utility model;

[0031] Figure 8 is a schematic structural diagram of the bending portion provided by the present utility model;

[0032] Figure 9 is a schematic structural diagram of the bending portion during bending provided by the present utility model.

[0033] The markings in the figures are explained as follows:

[0034] 1. Backlight circuit board; 2. Display screen circuit board; 3. Backlight; 4. Display board; 5. Main body; 6. Fixed end; 7. Movable end; 8. Welding area; 9. Groove; 10. Double-sided adhesive; 11. Guide portion; 12. Bending portion; 13. Scratch-proof strip. Detailed implementation manner

[0035] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0036] As described in the background art, when the display screen module is bent during application and assembly, the backlight FPC will be pulled during the whole process. At this time, the welding position is easily damaged and broken. Secondly, the FPC of the liquid crystal display panel is also a welding interface. If the welding pad position of the backlight FPC and the welding position of the FPC of the liquid crystal display panel are relatively close, the heat will be conducted to the welding position of the backlight FPC when welding the FPC of the liquid crystal display panel, affecting the solder stability of the backlight FPC.

[0037] To solve this technical problem, the present utility model provides a flexible circuit board welding structure.

[0038] Specifically, please refer to Figures 1-9 , for the flexible circuit board welding structure, the flexible circuit board includes a backlight circuit board 1 and a display screen circuit board 2. One end of the backlight circuit board 1 is connected to the backlight 3, a display board 4 is provided on the backlight 3, the display screen circuit board 2 is connected to the display board 4, the other end of the backlight circuit board 1 is connected to the display screen circuit board 2, and the display screen circuit board 2 includes:

[0039] A main body 5 having a fixed end 6 and a movable end 7, the fixed end 6 is connected to the display board 4; a welding area 8 is provided on the main body 5, the surface of the welding area 8 is fixedly connected to the backlight circuit board 1, and along the edge of the welding area 8, an isolation area is provided on the surface of the main body 5, and the isolation area is used to separate the welding area 8 from the movable end 7.

[0040] The present utility model can separate the welding area 8 from the movable end 7 through the isolation area, so that the welding position exists independently. Even if the backlight circuit board 1 and the display screen circuit board 2 need to be bent during assembly, because the welding area 8 is separated from the movable end 7, the welding area 8 will not be pulled, and at the same time, the heat during welding can also be isolated.

[0041] To enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0042] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] Please refer to Figures 1-3 , the flexible circuit board includes a backlight circuit board 1 and a display screen circuit board 2. One end of the backlight circuit board 1 is connected to the backlight 3. A display board 4 is provided on the backlight 3. The display screen circuit board 2 is connected to the display board 4. The other end of the backlight circuit board 1 is connected to the display screen circuit board 2. The display screen circuit board 2 includes:

[0045] A main body 5, the main body 5 has a fixed end 6 and a movable end 7, and the fixed end 6 is connected to the display board 4; a welding area 8 is provided on the main body 5, and the surface of the welding area 8 is fixedly connected to the backlight circuit board 1. Along the edge of the welding area 8, an isolation area is provided on the surface of the main body 5, and the isolation area is used to separate the welding area 8 from the movable end 7. The present utility model can separate the welding area 8 from the movable end 7 through the isolation area, so that the welding position exists independently. Even when the backlight circuit board 1 and the display screen circuit board 2 need to be bent during assembly, because the welding area 8 is separated from the movable end 7, the welding area 8 will not be pulled, and at the same time, the heat during welding can be isolated.

[0046] In some specific embodiments, the isolation area may be a strip structure provided, for example, a metal strip, and all forces are isolated by the metal strip. However, this requires a higher strength for the flexible circuit board. Therefore, the isolation area is a slot 9 with an L-shaped structure.

[0047] The welding structure of the flexible circuit board provided in Embodiment 1 is further optimized. In order to further separate the welding area 8 from the main body 5, a fixing member is provided on the back surface of the welding area 8 for connecting to the surface of the backlight 3 away from the display board 4. Through the above design, the welding area 8 can be further away from the main body 5, and during welding, the heat will not affect each other.

[0048] In some specific embodiments, the fixing member is a double-sided adhesive 10. With this design, the welding area 8 can be quickly fixedly connected to the back surface of the backlight 3, and no auxiliary operations such as heating are required during the connection process.

[0049] The flexible circuit board welding structure provided in Embodiment 1 or 2 is further optimized. In order to prevent the connection area between the welding area 8 and the backlight 3 from tilting, a guiding portion 11 is provided on the surface of the backlight 3 away from the display board 4 for limiting the connection area between the welding area 8 and the backlight 3.

[0050] In some specific embodiments, the guiding portion 11 is a groove or a protrusion (the protrusion can be made of a metal part or other materials. Its main function is to block the welding area 8 when it is fixed. However, the presence of the protrusion will cause a protruding area on the backlight 3, so a groove is selected).

[0051] In some specific embodiments, when the guiding portion 11 is a groove, the groove is arranged along the edge of the welding area 8 connected to the backlight 3. Such an arrangement can limit the position of the welding area 8 when it is fixed, and at the same time, it will not affect the setting of the backlight 3.

[0052] In some specific embodiments, there is a bending portion 12 between the welding area 8 and the fixed end 6. The welding area 8 can deflect around the end of the bending portion 12 close to the fixed end 6 until it is connected to the backlight 3. The bending portion 12 is provided to ensure that the distance between the welding area 8 and the backlight 3 is sufficient.

[0053] By limiting the connection area between the welding area 8 and the backlight 3 through the guiding portion 11, when the welding area 8 is pasted on the backlight 3, it will not occur that due to position deviation, the distance between the bending portion 12 and the backlight 3 is too close, resulting in rubbing between the bending portion 12 of the backlight 3.

[0054] In the further optimization of the flexible circuit board welding structure provided in the above embodiments, an anti-scratch strip 13 is provided on the surface of the bending portion 12. Since the welding area 8 can deflect around the end of the bending portion 12 close to the fixed end 6 until it is connected to the backlight 3, the anti-scratch strip 13 is provided to always maintain a gap between the surface of the bending portion 12 and the backlight 3, so that even if the backlight 3 shakes, there will be no rubbing with the bending portion 12.

[0055] In some specific embodiments, the anti-scratch strip 13 is located on the same side of the fixing member, and the length of the anti-scratch strip 13 is not less than the width of the bending portion 12. Such an arrangement is to ensure that when the bending portion 12 is tilted, the anti-scratch strip 13 protruding from the edge of the bending portion 12 can also play a role in preventing rubbing.

[0056] The usage process of the flexible circuit board welding structure provided by the present utility model is as follows:

[0057] Taking the end of the bending portion 12 close to the fixed end 6 as the center, it deflects until it is connected to the backlight 3. When connecting, the double-sided adhesive 10 can quickly fix the welding area 8 to the back of the backlight 3, and no auxiliary operations such as heating are required during the connection process. At the same time, the guiding portion 11 can limit the position of the welding area 8 when it is fixed.

[0058] Because the display module will bend the FPC during application and assembly, and the backlight FPC will be pulled during the whole process. At this time, the welding position is prone to breakage. To solve this problem, the welding area 8 can be separated from the movable end 7 through the isolation area.

[0059] The FPC of the liquid crystal display panel is also a welding interface. If the pad position of the backlight FPC and the welding position of the FPC of the liquid crystal display panel are relatively close, the heat will be conducted to the welding position of the backlight FPC when welding the FPC of the liquid crystal display panel, which will affect the solder stability of the backlight FPC. This is initially solved by the slot 9. At the same time, the presence of the double-sided adhesive 10 can quickly fix the welding area 8 to the back of the backlight 3, and no auxiliary operations such as heating are required during the connection process. Thus, this problem is solved.

[0060] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0061] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all embodiments. The preferred embodiments of the present utility model are given in the drawings, but they do not limit the patent scope of the present utility model. The present utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present utility model in other related technical fields shall be within the scope of the patent protection of the present utility model by the same token.

Claims

1. A flexible circuit board welding structure, the flexible circuit board includes a backlight circuit board (1) and a display screen circuit board (2), one end of the backlight circuit board (1) is connected to a backlight (3), a display board (4) is provided on the backlight (3), the display screen circuit board (2) is connected to the display board (4), and the other end of the backlight circuit board (1) is connected to the display screen circuit board (2), characterized in that, The display circuit board (2) includes: A main body (5) having a fixed end (6) and a movable end (7), the fixed end (6) being connected to the display board (4); a welding area (8) is provided on the main body (5), the surface of the welding area (8) is fixedly connected to the backlight circuit board (1), and along the edge of the welding area (8), an isolation area is provided on the surface of the main body (5), and the isolation area is used to separate the welding area (8) from the movable end (7).

2. The flexible circuit board welding structure according to claim 1, wherein The isolation area is a slot (9) with an L-shaped structure.

3. The flexible circuit board welding structure according to claim 2, characterized in that, A fixing member is provided on the back surface of the welding area (8) for connecting to the surface of the backlight (3) on the side away from the display board (4).

4. The flexible circuit board welding structure according to claim 3, wherein The fixing member is a double-sided adhesive (10).

5. The flexible circuit board welding structure according to claim 1, wherein A guiding portion (11) is provided on the surface of the backlight (3) on the side away from the display board (4) for limiting the connection area between the welding area (8) and the backlight (3).

6. The flexible circuit board welding structure according to claim 5, wherein, The guiding portion (11) is a groove or a protruding portion.

7. The flexible circuit board soldering structure according to claim 6, wherein, When the guiding portion (11) is a groove, the groove is provided along the edge of the welding area (8) connected to the backlight (3).

8. The flexible circuit board welding structure according to claim 3, wherein There is a bending portion (12) between the welding area (8) and the fixed end (6), and the welding area (8) can deflect around the end of the bending portion (12) close to the fixed end (6) until it is connected to the backlight (3).

9. The flexible circuit board soldering structure according to claim 8, wherein, An anti-scratch strip (13) is provided on the surface of the bending portion (12).

10. The flexible circuit board welding structure according to claim 9, wherein, The anti-scratch strip (13) is on the same side as the fixing member, and the length of the anti-scratch strip (13) is not less than the width of the bending portion (12).

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