Switching FPC (Flexible Printed Circuit) for solving problem of micro-short metal wiring of touch screen

Abstract

The utility model discloses a switching FPC (Flexible Printed Circuit) for solving the problem of micro-short metal wiring of a touch screen, which comprises a first metal wiring layer and a second metal wiring layer, the first metal wiring layer comprises a first connecting part and a first binding part, the first binding part is connected with the first connecting part, and the first binding part comprises a plurality of first binding contact ends; the second metal wiring layer comprises a second connecting part and a plurality of second binding parts, the second connecting part is connected with the second binding parts, and the second binding parts comprise a plurality of second binding contact ends; the first binding contact ends and the second binding contact ends are alternately arranged at intervals. The first binding contact end and the second binding contact end correspond to the positive electrode and the negative electrode respectively, so that binding connection with the adjacent metal wires on the touch screen can be carried out in sequence, then only the positive electrode and the negative electrode of the FPC body need to be electrified, and the micro-short problem between the adjacent channels of the touch screen can be tested; therefore, a sample which is slightly short can be repaired correspondingly, and the production yield can be further improved.

Description

Technical Field

[0001] The utility model relates to the field of touch screen production, in particular to a transfer FPC for solving the problem of short metal wiring of a touch screen. Background Art

[0002] Touch screens are equipped with metal traces. During the production process, touch screen products often have a functional problem of micro-short metal traces, that is, a slight short circuit occurs in the metal traces, which will make the channel unable to work normally. At the same time, micro-shorts often cause unstable functional problems, which may cause the touch screen to fail before shipment or at the customer end. It is also possible that it may fail when used in the market. Therefore, it will not only bring serious economic losses, but also cause unnecessary customer complaints. Usually, the problem of micro-short metal traces is caused by the incomplete etching of the gap between two metal traces, that is, the micro-short defects are between adjacent channels.

[0003] Existing testing tools usually detect touch screen defects by testing capacitors, but it is difficult to detect the defect of metal trace micro-shorts by testing capacitors. Therefore, a transfer FPC for solving the problem of metal trace micro-shorts in touch screens is proposed. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a transfer FPC for solving the problem of short metal wiring on a touch screen.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A transfer FPC for solving the problem of short metal wiring of a touch screen comprises: an FPC body, on which a first metal wiring layer and a second metal wiring layer are arranged; the first metal wiring layer comprises a first connecting portion and a first binding portion, the first binding portion is connected to the first connecting portion, and the first binding portion comprises a plurality of first binding contact terminals; the second metal wiring layer comprises a second connecting portion and a plurality of second binding portions, the second connecting portion is connected to the second binding portion, and the second binding portion comprises a plurality of second binding contact terminals; each of the first binding contact terminals and each of the second binding contact terminals are alternately arranged at intervals.

[0007] In one embodiment, the FPC body includes a first covering film, a first metal wiring layer, a base film, a second metal wiring layer and a second covering film which are stacked in sequence.

[0008] In one embodiment, the first covering film is a PI covering film.

[0009] In one embodiment, the first metal wiring layer is a copper metal wiring layer.

[0010] In one embodiment, the substrate film is a PI substrate film.

[0011] In one embodiment, the second metal wiring layer is a copper metal wiring layer.

[0012] In one embodiment, the second cover film is a PI cover film.

[0013] In one embodiment, a relief groove is formed on the FPC body, and the relief groove is located between the first connecting portion and the second connecting portion.

[0014] In one embodiment, a first reinforcing plate is provided at the plug-in end of the first connecting portion, and a second reinforcing plate is provided at the plug-in end of the second connecting portion.

[0015] In one embodiment, the first reinforcement plate is a PI reinforcement plate, and the second reinforcement plate is a PI reinforcement plate.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] The utility model discloses a transfer FPC for solving the problem of micro-short of metal wiring of a touch screen, which is provided with a first metal wiring layer and a second metal wiring layer, that is, two layers of metal wiring layers are adopted, and metal wiring layers of different layers respectively form a plurality of first binding contact terminals and a plurality of second binding contact terminals, and at the same time, each first binding contact terminal and each second binding contact terminal are arranged alternately and sequentially, and the first binding contact terminal and the second binding contact terminal correspond to positive and negative electrodes respectively, that is, the positive and negative electrodes are arranged alternately and sequentially, so that the adjacent metal wirings on the touch screen can be bound and connected in sequence, and then only the positive and negative electrodes of the FPC body need to be energized, so that the micro-short problem between adjacent channels of the touch screen can be tested, and after energization, the micro-short part can be burned, so that the micro-short products can be repaired accordingly, thereby improving the production yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the structure of a transfer FPC for solving the problem of short metal wiring on a touch screen in one embodiment of the utility model;

[0020] Figure 2 for Figure 1The schematic diagram of the structure of the transfer FPC for solving the problem of short metal wiring of the touch screen only shows the first metal wiring layer;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure of the transfer FPC that only displays the second metal wiring layer for solving the problem of short metal wiring of the touch screen;

[0022] Figure 4 for Figure 1 A local enlarged structural diagram of the transfer FPC at A used to solve the problem of short metal wiring on the touch screen;

[0023] Figure 5 This is a schematic diagram of the stacking structure of the transfer FPC used to solve the problem of short metal wiring on the touch screen in one embodiment of the utility model;

[0024] Figure 6 for Figure 5 A schematic diagram of the partially enlarged structure of the B portion of the transfer FPC used to solve the problem of short metal wiring on the touch screen; DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0026] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a transfer FPC 10 for solving the problem of short metal wiring of a touch screen includes: an FPC body, on which a first metal wiring layer 100 and a second metal wiring layer 200 are arranged; the first metal wiring layer 100 includes a first connecting portion 110 and a first binding portion 120, the first binding portion 120 is connected to the first connecting portion 110, and the first binding portion 120 includes a plurality of first binding contact terminals 121; the second metal wiring layer 200 includes a second connecting portion 210 and a plurality of second binding portions 220, the second connecting portion 210 is connected to the second binding portion 220, and the second binding portion 220 includes a plurality of second binding contact terminals 221; each first binding contact terminal 121 and each second binding contact terminal 221 are alternately arranged at intervals.

[0027] It should be noted that the micro-short problem of the touch screen is usually caused by the problem of unclean etching in the gap between two adjacent metal traces. Therefore, in the present invention, a corresponding transfer FPC is provided to perform micro-short detection on the metal traces of the touch screen; specifically, a first metal trace layer 100 and a second metal trace layer 200 are provided on the FPC body, and the first metal trace layer 100 forms a first connecting portion 120 and a first binding portion 120, and the first binding portion 120 forms a plurality of mutually connected first binding contact terminals 121. In the present embodiment, the first binding contact terminal 121 corresponds to the positive electrode; similarly, the second metal trace layer 200 forms a second connecting portion 210 and a second binding portion 220, and the second binding portion 220 forms a plurality of mutually connected first binding contact terminals 121. Two binding contact terminals 121, in the present embodiment, the second binding contact terminal 121 corresponds to the negative pole; thus, the first binding contact terminal 121 corresponding to the positive pole and the second binding contact terminal 221 corresponding to the negative pole are alternately arranged at intervals, thereby forming a transfer FPC metal wiring structure in which positive and negative poles are alternately arranged in sequence, so that the two adjacent metal wirings on the touch screen can be bound and connected, and by testing the resistance between the two adjacent metal wirings, the defective touch screen products with micro-short problems can be effectively detected; further, since the common micro-short problems on touch screens are caused by the problem of unclean etching in the gap between two adjacent wirings, by energizing the FPC body 100, the micro-short parts can be burned, so that the micro-short products can be repaired accordingly, thereby improving the production yield.

[0028] For further information, see Figure 5 and Figure 6 As shown, the FPC body 100 includes a first cover film 300 , a first metal wiring layer 100 , a base film 400 , a second metal wiring layer 200 and a second cover film 500 which are stacked in sequence.

[0029] It should be noted that the first metal wiring layer 100 and the second metal wiring layer 200 are formed on the substrate film 400 through an etching process; the first covering film 300 and the second covering film 500 serve as protective films and insulating layers to provide insulation protection for the first metal wiring layer 100 and the second metal wiring layer 200. Furthermore, the first covering film 300 corresponding to each first binding contact terminal 121 on the first metal wiring layer 100 has a window, so that the first binding contact terminal 121 is exposed; at the same time, a hole is opened at the substrate film 400, so that each second binding contact terminal 221 on the second metal wiring layer 200 is on the same plane as the first binding contact terminal 121. It should be noted that the first binding contact terminal 121 does not contact the second binding contact terminal 221 to avoid short circuit. Furthermore, each layer structure can be connected by bonding with an adhesive; in addition, it should be noted that in the present invention, the FPC body adopts a double-sided FPC structure, and its production and processing technology is the same as that of the conventional double-sided FPC structure, so it will not be repeated here.

[0030] Preferably, the first cover film 300 is a PI (polyimide) cover film. Since polyimide has excellent high temperature resistance, chemical stability and mechanical properties, the first cover film 300 can protect the first metal wiring layer 100.

[0031] Preferably, the first metal wiring layer 100 is a copper metal wiring layer.

[0032] Preferably, the substrate film 400 is a PI substrate film. Similarly, since polyimide has excellent high temperature resistance, chemical stability, mechanical properties and cold resistance, it can ensure that the FPC can still maintain stable performance in harsh environments.

[0033] Preferably, the second metal wiring layer 200 is a copper metal wiring layer.

[0034] Preferably, the second cover film is a PI cover film. Since polyimide has excellent high temperature resistance, chemical stability and mechanical properties, the second cover film 500 can protect the second metal wiring layer 200.

[0035] In one embodiment, a relief groove 600 is formed on the FPC body, and the relief groove 600 is located between the first connection portion 110 and the second connection portion 210 .

[0036] It should be noted that the first connection part 110 corresponds to the positive electrode, and the second connection part 210 corresponds to the negative electrode. In order to make the first connection part 110 and the second connection part 210 separately connected to the power supply end, the first connection part 110 and the second connection part 210 are separated by opening an avoidance groove 600, and the avoidance groove 600 is punched and rounded to avoid stress concentration during bending, which may cause the FPC body to tear.

[0037] In one embodiment, a first reinforcing plate is disposed at the plug-in end of the first connection portion 110 , and a second reinforcing plate 211 is disposed at the plug-in end of the second connection portion 210 .

[0038] It should be noted that the plug-in end on the first connection part 110, that is, the first connection part 110 extends toward the edge of the FPC body to form a positive gold finger for plugging. By setting a first reinforcement plate on the back of the FPC corresponding to the positive gold finger, the hardness of the plug-in end can be increased to facilitate plug-in and unplugging operations; similarly, the plug-in end on the second connection part 210, that is, the second connection part 210 extends toward the edge of the FPC body to form a negative gold finger for plugging. By setting a second reinforcement plate 211 on the back of the FPC corresponding to the negative gold finger, the hardness of the plug-in end can be increased to facilitate plug-in and unplugging operations. Preferably, the first reinforcement plate is a PI reinforcement plate, and the second reinforcement plate 211 is a PI reinforcement plate. It should also be noted that the negative gold finger of the second connection part 210 is also opened on the substrate film 400, so that the negative gold finger and the positive gold finger are on the same side.

[0039] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A transfer FPC for solving the problem of short metal wiring on a touch screen, characterized in that: include: An FPC body, wherein a first metal wiring layer and a second metal wiring layer are arranged on the FPC body; The first metal wiring layer includes a first connecting portion and a first binding portion, the first binding portion is connected to the first connecting portion, and the first binding portion includes a plurality of first binding contact terminals; The second metal wiring layer includes a second connecting portion and a plurality of second binding portions, the second connecting portion is connected to the second binding portion, and the second binding portion includes a plurality of second binding contact terminals; The first binding contact ends and the second binding contact ends are arranged alternately and at intervals.

2. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 1 is characterized in that: The FPC body includes a first covering film, a first metal wiring layer, a base film, a second metal wiring layer and a second covering film which are stacked in sequence.

3. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 2 is characterized in that: The first covering film is a PI covering film.

4. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 3 is characterized in that: The first metal wiring layer is a copper metal wiring layer.

5. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 4 is characterized in that: The substrate film is a PI substrate film.

6. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 5 is characterized in that: The second metal wiring layer is a copper metal wiring layer.

7. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 6 is characterized in that: The second covering film is a PI covering film.

8. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 7 is characterized in that: The FPC body is provided with an escape groove, and the escape groove is located between the first connecting portion and the second connecting portion.

9. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 1, characterized in that: The plug-in end on the first connection part is provided with a first reinforcement plate, and the plug-in end on the second connection part is provided with a second reinforcement plate.

10. The transfer FPC for solving the problem of short metal wiring on a touch screen according to claim 9, characterized in that: The first reinforcing plate is a PI reinforcing plate, and the second reinforcing plate is a PI reinforcing plate.

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