Flexible circuit board

Abstract

A flexible circuit board comprises a flexible substrate, a first circuit and a second circuit, the flexible substrate is provided with an upper surface, the upper surface is provided with an upper edge, a lower edge, a first circuit setting area and a second circuit setting area, the first circuit is arranged in the first circuit setting area, the first circuit is provided with a first input end and a first output end, and the second circuit is arranged in the second circuit setting area. The first circuit is arranged in the first circuit arrangement area, the first input end is adjacent to the lower edge, the first output end is adjacent to the upper edge, the second circuit is arranged in the second circuit arrangement area, the second circuit is provided with a second input end and a second output end, the second input end is adjacent to the upper edge, and the second output end is adjacent to the lower edge.

Description

Technical Field

[0001] The invention relates to a flexible circuit board, in particular to a circuit arrangement on a flexible substrate of the flexible circuit board. Background Art

[0002] Because of its flexibility, the flexible printed circuit board can be placed on the back of the electronic device and connected to the connection terminal on the front of the electronic device through the bent part. This makes it unnecessary to reserve a place for the flexible printed circuit board on the front of the electronic device and is very suitable for borderless panels. However, as the number of pixels in the panel increases, the number of output lines of the flexible printed circuit board also increases. The difference in the number of input lines and output lines can be as much as 20 times, which makes the width of the output end of the flexible printed circuit board wider and wider, but the width of the input end changes less. Since the flexible printed circuit board is processed through a roll-to-roll process, when the width of the output end of a single flexible printed circuit board increases, the width of the tape must also be increased. What's worse, a single tape cannot hold two side-by-side flexible printed circuit boards. Because the width of the input end does not change much, the increase in the width of the output end of the flexible printed circuit board will cause most of the space on the flexible substrate to be redundant idle space, resulting in waste and a significant increase in production costs. Summary of the invention

[0003] The main purpose of the present invention is to arrange the output / input ends of two parallel circuits on a flexible substrate in opposite directions, so as to effectively utilize all the space of the flexible substrate and avoid the problem of the output end width of the circuit being too wide, which leads to an increase in manufacturing cost.

[0004] A flexible circuit board of the present invention comprises a flexible substrate, a first circuit and a second circuit. The flexible substrate has an upper surface, the upper surface has an upper edge, a lower edge, a first circuit setting area and a second circuit setting area. The first circuit is set in the first circuit setting area, wherein the first circuit has a first input end and a first output end, the first input end is adjacent to the lower edge, and the first output end is adjacent to the upper edge. The second circuit is set in the second circuit setting area, wherein the second circuit has a second input end and a second output end, the second input end is adjacent to the upper edge, and the second output end is adjacent to the lower edge.

[0005] Preferably, the first circuit has a plurality of first input circuits and a plurality of first output circuits, the plurality of first input circuits are located at the first input end and arranged along the first input end, the plurality of first output circuits are located at the first output end and arranged along the first output end, and the second circuit has a plurality of second input circuits and a plurality of second output circuits, the plurality of second input circuits are located at the second input end and arranged along the second input end, the plurality of second output circuits are located at the second output end and arranged along the second output end.

[0006] Preferably, the number of the plurality of first input circuits is equal to the number of the plurality of second input circuits, and the number of the plurality of first output circuits is equal to the number of the plurality of second output circuits.

[0007] Preferably, the number of the multiple first output lines is greater than the number of the multiple first input lines, the number of the multiple second output lines is greater than the number of the multiple second input lines, and the number of the multiple first output lines is between 1.4 and 20 times the number of the multiple first input lines, and the number of the multiple second output lines is between 1.4 and 20 times the number of the multiple second input lines.

[0008] Preferably, the first circuit comprises a first chip, a plurality of first transmission lines and a plurality of second transmission lines, the first chip having a first input side and a first output side, the first input side facing the first input end, the first output side facing the first output end, one end of each of the first transmission lines connected to the first input side of the first chip, the other end of each of the first transmission lines connected to the first input line, one end of each of the second transmission lines connected to the first output side of the first chip, the other end of each of the second transmission lines connected to the first output line, the second circuit comprises a second chip, a plurality of third transmission lines and a plurality of fourth transmission lines, the second chip having a second input side and a second output side, the second input side facing the second input end, the second output side facing the second output end, one end of each of the third transmission lines connected to the second input side of the second chip, the other end of each of the third transmission lines connected to the second input line, one end of each of the fourth transmission lines connected to the second output side of the second chip, and the other end of each of the fourth transmission lines connected to the second output line.

[0009] Preferably, the first circuit has a plurality of fifth transmission lines, one end of each of the fifth transmission lines is electrically connected to each of the first input lines, and the other end of each of the fifth transmission lines is electrically connected to each of the first output lines, and the second circuit has a plurality of sixth transmission lines, one end of each of the sixth transmission lines is electrically connected to each of the second input lines, and the other end of each of the sixth transmission lines is electrically connected to each of the second output lines.

[0010] Preferably, the number of the plurality of first input circuits is not equal to the number of the plurality of second input circuits, and the number of the plurality of first output circuits is not equal to the number of the plurality of second output circuits.

[0011] Preferably, the upper surface has a left edge, a right edge, a plurality of first chain holes and a plurality of second chain holes, the plurality of first chain holes are adjacent to the left edge and arranged along the left edge, the plurality of second chain holes are adjacent to the right edge and arranged along the right edge, wherein the first circuit setting area is located between the left edge and the second circuit setting area, the second circuit setting area is located between the right edge and the first circuit setting area, the plurality of first chain holes are located between the left edge and the first circuit setting area, and the plurality of second chain holes are located between the right edge and the second circuit setting area.

[0012] Preferably, the first circuit setting area has a right bending edge, the second circuit setting area has a left bending edge, the right bending edge of the first circuit setting area and the left bending edge of the second circuit setting area are parallel to each other and adjacent to the central axis of the upper surface.

[0013] Preferably, the first circuit setting area has a left straight edge, and the second circuit setting area has a right straight edge, the left straight edge of the first circuit setting area is adjacent to the left edge of the upper surface, and the plurality of first chain holes are located between the left straight edge and the left edge, the right straight edge of the second circuit setting area is adjacent to the right edge of the upper surface, and the plurality of second chain holes are located between the right straight edge and the right edge.

[0014] The main purpose of the present invention is to arrange the first circuit and the second circuit arranged side by side on the flexible substrate in opposite directions, so that the first input end of the first circuit, which is narrower, and the second output end of the second circuit, which is wider, are arranged on the same edge, and the first output end of the first circuit, which is wider, and the second input end of the second circuit, which is narrower, are arranged on the same edge, thereby effectively utilizing the space of the flexible substrate and avoiding increasing the manufacturing cost of the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : A top view of a flexible printed circuit board according to the first embodiment of the present invention.

[0016] Figure 2 : A top view of a flexible printed circuit board according to a second embodiment of the present invention.

[0017] Figure 3 : A top view of a flexible printed circuit board according to a third embodiment of the present invention.

[0018] Figure 4 : A top view of a flexible printed circuit board according to a fourth embodiment of the present invention.

[0019]

Main component symbol description

[0020] 100: Flexible printed circuit board 110: Flexible substrate

[0021] 111: Upper surface CL: Central axis

[0022] 111a: upper edge 111b: lower edge

[0023] 111c: left edge 111d: right edge

[0024] 111e: first chain hole 111f: second chain hole

[0025] a1: first circuit setting area rb: right bending edge

[0026] ls: left straight line edge a2: second circuit setting area

[0027] lb: left curved edge rs: right straight edge

[0028] 120: first circuit i 1: first input terminal

[0029] o1: first output terminal 121: first input line

[0030] 122: first output line 123: first chip

[0031] 123a: first input side 123b: first output side

[0032] 124: first transmission line 125: second transmission line

[0033] 130: second circuit i2: second input terminal

[0034] o2: second output terminal 131: second input line

[0035] 132: second output line 133: second chip

[0036] 133a: second input side 133b: second output side

[0037] 134: third transmission line 135: fourth transmission line

[0038] 126: fifth transmission line 136: sixth transmission line DETAILED DESCRIPTION

[0039] See also Figure 1, which is a first embodiment of the present invention, a top view of a flexible circuit board 100, the flexible circuit board 100 includes a flexible substrate 110, a first circuit 120 and a second circuit 130, the flexible substrate 110 has an upper surface 111, the upper surface 111 has an upper edge 111a, a lower edge 111b, a left edge 111c, a right edge 111d, a first circuit setting area a1 and a second circuit setting area a2. The upper edge 111a, the lower edge 111b, the left edge 111c and the right edge 111d are respectively the upper, lower, left and right edges of the upper surface 111 in the figure, and since the flexible printed circuit 100 is subjected to various processes in a roll-to-roll manner before punching, in the whole roll tape, the upper edge 111a of the upper surface 111 will be connected to the lower edge 111b of the upper surface 111 of another flexible printed circuit 100, and the lower edge 111b of the upper surface 111 will be connected to the upper edge 111a of the upper surface 111 of another flexible printed circuit 100. If the size of a single flexible printed circuit 100 is small, the right edge 111d of the upper surface 111 can also be connected to the left edge 111c of the upper surface 111 of another flexible printed circuit 100 to form a roll tape with four circuits arranged side by side.

[0040] The first circuit setting area a1 of the upper surface 111 is the range surrounded by the left dotted line in the figure, and the second circuit setting area a2 of the upper surface 111 is the range surrounded by the right dotted line in the figure. The first circuit setting area a1 and the second circuit setting area a2 are side by side with each other. The first circuit setting area a1 is located between the left edge 111c and the second circuit setting area a2, and the second circuit setting area a2 is located between the right edge 111d and the first circuit setting area a1. The first circuit setting area a1 and the second circuit setting area a2 are areas of actual circuits formed after punching along the dotted lines in subsequent processes.

[0041] Preferably, the upper surface 111 also has a plurality of first chain holes 111e and a plurality of second chain holes 111f, wherein the plurality of first chain holes 111e are adjacent to the left edge 111c and are arranged along the left edge 111c, and the plurality of second chain holes 111f are adjacent to the right edge 111d and are arranged along the right edge 111d, wherein the plurality of first chain holes 111e are located between the left edge 111c and the first circuit setting area a1, and the plurality of second chain holes 111f are located between the right edge 111d and the second circuit setting area a2, and the plurality of first chain holes 111e and the plurality of second chain holes 111f are used for roll-to-roll equipment to move each of the flexible circuit boards 100.

[0042] The first circuit 120 is disposed in the first circuit arrangement area a1, and has a first input terminal i1, a first output terminal o1, a plurality of first input lines 121, a plurality of first output lines 122, a first chip 123, a plurality of first transmission lines 124, and a plurality of second transmission lines 125. The first input terminal i1 of the first circuit 120 is adjacent to the lower edge 111b, and the first output terminal o1 of the first circuit 120 is adjacent to the upper edge 111a. The first input terminal i1 and the first output terminal o1 are respectively a signal receiving terminal and a signal output terminal of the first circuit 120. The plurality of first input lines 121, the plurality of first output lines 122, the plurality of first transmission lines 124, and the plurality of second transmission lines 125 are formed on the upper surface 111 by copper electroplating and pattern etching, and the first chip 123 is disposed on the upper surface 111 by a flip chip process and is electrically connected to the plurality of first transmission lines 124 and the plurality of second transmission lines 125.

[0043] The multiple first input lines 121 are located at the first input end i1 and arranged along the first input end i1, the multiple first output lines 122 are located at the first output end o1 and arranged along the first output end o1, and the first chip 123 has a first input side 123a and a first output side 123b, the first input side 123a faces the first input end i1, and the first output side 123b faces the first output end o1. One end of each of the first transmission lines 124 is connected to the first input side 123a of the first chip 123, and the other end of each of the first transmission lines 124 is connected to the multiple first input lines 121. The interconnected first input lines 121 and the first transmission lines 124 are essentially the same line located at different positions. The multiple first input lines 121 are used to connect to other electronic components (such as an external driving circuit board), and the multiple first transmission lines 124 are used to provide electrical connections between the multiple first input lines 121 and the multiple first input sides 123a of the first chip 123. One end of each of the second transmission lines 125 is connected to the first output side 123b of the first chip 123, and the other end of each of the second transmission lines 125 is connected to the multiple first output lines 122. The interconnected first output lines 122 and the second transmission lines 125 are essentially the same line located at different positions. The multiple first output lines 122 are used to connect to other electronic components (such as panels), and the multiple second transmission lines 125 are used to provide electrical connections between the multiple first output lines 122 and the first output sides 123b of the multiple first chips 123.

[0044] The second circuit 130 is disposed in the second circuit arrangement area a2, and the second circuit 130 has a second input terminal i2, a second output terminal o2, a plurality of second input lines 131, a plurality of second output lines 132, a second chip 133, a plurality of third transmission lines 134, and a plurality of fourth transmission lines 135. The second input terminal i2 of the second circuit 130 is adjacent to the upper edge 111a, the second output terminal o2 of the second circuit 130 is adjacent to the lower edge 111b, and the second input terminal i2 and the second output terminal o2 are respectively the signal receiving terminal and the signal output terminal of the second circuit 130. The plurality of second input lines 131, the plurality of second output lines 132, the plurality of third transmission lines 134, and the plurality of fourth transmission lines 135 are formed on the upper surface 111 by electroplating copper and pattern etching, and the second chip 133 is disposed on the upper surface 111 by a flip chip process and is electrically connected to the plurality of third transmission lines 134 and the plurality of fourth transmission lines 135.

[0045] The plurality of second input lines 131 are located at the second input end i2 and arranged along the second input end i2, the plurality of second output lines 132 are located at the second output end o2 and arranged along the second output end o2, the second chip 133 has a second input side 133a and a second output side 133b, the second input side 133a faces the second input end i2, and the second output side 133b faces the second output end o2. One end of each of the third transmission lines 134 is connected to the second input side 133a of the second chip 133, and the other end of each of the third transmission lines 134 is connected to the plurality of second input lines 131. The second input lines 131 and the third transmission lines 134 connected to each other are actually the same line located at different positions. The plurality of second input lines 131 are used to connect to other electronic components (such as an external driving circuit board), and the plurality of third transmission lines 134 are used to provide electrical connection between the plurality of second input lines 131 and the plurality of second input sides 133a of the second chip 133. One end of each of the fourth transmission lines 135 is connected to the second output side 133b of the second chip 133, and the other end of each of the fourth transmission lines 135 is connected to the multiple second output lines 132. The interconnected second output lines 132 and the fourth transmission lines 135 are actually the same line located at different positions. The multiple second output lines 132 are used to connect with other electronic components (such as a panel), and the multiple fourth transmission lines 135 are used to provide electrical connections between the multiple second output lines 132 and the second output sides 133b of the multiple second chips 133.

[0046] See also Figure 1In this embodiment, the number of the plurality of first output lines 122 of the first circuit 120 is greater than the number of the plurality of first input lines 121 of the first circuit 120, and the first output end o1 of the first circuit 120 faces the upper edge 111a of the upper surface 111, and the first input end i1 of the first circuit 120 faces the lower edge 111b of the upper surface 111, so the first circuit 120 presents a profile that is wide at the top and narrow at the bottom. The number of the plurality of second output lines 132 of the second circuit 130 is greater than the number of the plurality of second input lines 131 of the second circuit 130, and the second output end o2 of the second circuit 130 faces the lower edge 111b of the upper surface 111, and the second input end i2 of the second circuit 130 faces the upper edge 111a of the upper surface 111, so the second circuit 130 presents a profile that is narrow at the top and wide at the bottom. Therefore, the arrangement of the first circuit 120 and the second circuit 130 in opposite directions can effectively utilize the space of the upper surface 111 to reduce the problem of increased manufacturing cost of the flexible substrate 110 due to excessive redundant space.

[0047] In this embodiment, the number of the plurality of first output circuits 122 is between 1.4 and 20 times the number of the plurality of first input circuits 121, and the number of the plurality of second output circuits 132 is between 1.4 and 20 times the number of the plurality of second input circuits 131. If the difference between the number of the plurality of first output circuits 122 and the number of the plurality of first input circuits 121 is greater, this embodiment can more effectively utilize the space of the upper surface 111 by arranging the first circuit 120 and the second circuit 130 in opposite directions.

[0048] Alternatively, in other embodiments, the number of the multiple first output circuits 122 of the first circuit 120 is smaller than the number of the multiple first input circuits 121 of the first circuit 120, so that the first circuit 120 will present a profile that is narrow at the top and wide at the bottom, and the number of the multiple second output circuits 132 of the second circuit 130 is smaller than the number of the multiple second input circuits 131 of the second circuit 130, so that the second circuit 130 will present a profile that is wide at the top and narrow at the bottom. Similarly, the space on the upper surface 111 can be effectively utilized by arranging the first circuit 120 and the second circuit 130 in opposite directions.

[0049] See also Figure 1In this embodiment, the first circuit 120 and the second circuit 130 are the same circuit, and only the setting direction on the flexible substrate 110 is different. Therefore, the number of the plurality of first input circuits 121 is equal to the number of the plurality of second input circuits 131, the number of the plurality of first output circuits 122 is equal to the number of the plurality of second output circuits 132, and the outer contours of the first circuit setting area a1 and the second circuit setting area a2 are the same.

[0050] See also Figure 1 The first circuit setting area a1 has a right bending edge rb, and the second circuit setting area a2 has a left bending edge lb. The right bending edge rb of the first circuit setting area a1 and the left bending edge lb of the second circuit setting area a2 are arranged side by side and adjacent to the central axis CL of the upper surface 111, so that the central area of ​​the upper surface 111 can be effectively utilized. Preferably, the right bending edge rb of the first circuit setting area a1 is parallel to the left bending edge lb of the second circuit setting area a2, so that the upper surface 111 of the flexible substrate 110 can be used to the maximum extent. In addition, the first circuit setting area a1 also has a left straight edge ls, and the left straight edge ls of the first circuit setting area a1 is adjacent to the left edge 111c of the upper surface 111, and the plurality of first chain holes 111e are located between the left straight edge ls and the left edge 111c. The second circuit arrangement area a2 further has a right straight edge rs, the right straight edge rs of the second circuit arrangement area a2 is adjacent to the right edge 111d of the upper surface 111, and the plurality of second chain holes 111f are located between the right straight edge rs and the right edge 111d. Thus, the left straight edge ls of the first circuit arrangement area a1 can be aligned with the plurality of first chain holes 111e, and the right straight edge rs of the second circuit arrangement area a2 can be aligned with the plurality of second chain holes 111f, so that the area of ​​the upper surface 111 adjacent to the left edge 111c and the right edge 111d can also be effectively utilized.

[0051] See also Figure 2, which is the second embodiment of the present invention, and the difference between the first embodiment and the first embodiment is that the first circuit 120 further comprises a plurality of fifth transmission lines 126, one end of each of the fifth transmission lines 126 is electrically connected to each of the first input lines 121, and the other end of each of the fifth transmission lines 126 is electrically connected to each of the first output lines 122, and the second circuit 130 further comprises a plurality of sixth transmission lines 136, one end of each of the sixth transmission lines 136 is electrically connected to each of the second input lines 131, and the other end of each of the sixth transmission lines 136 is electrically connected to each of the second output lines 132. Each of the fifth transmission lines 126 is used for directly transmitting signals to each of the first input lines 121 and each of the first output lines 122 connected thereto without passing through the first chip 123, and the plurality of sixth transmission lines 136 are used for directly transmitting signals to each of the second input lines 131 and each of the second output lines 132 connected thereto without passing through the second chip 133.

[0052] See also Figure 3 , which is the third embodiment of the present invention. The difference between the third embodiment and the first embodiment is that the left side of the first circuit setting area a1 is not a straight line but a bend, and the right side of the second circuit setting area a2 is not a straight line but a bend. However, this embodiment can still effectively utilize the upper surface 111 of the flexible substrate 110 by arranging the input / output ends of the first circuit 120 and the second circuit 130 in opposite directions.

[0053] See also Figure 4 , which is the fourth embodiment of the present invention, and the difference between the fourth embodiment and the first embodiment is that the first circuit 120 and the second circuit 130 are not the same circuits. Therefore, in this embodiment, the number of the plurality of first input lines 121 is not equal to the number of the plurality of second input lines 131, and the number of the plurality of first output lines 122 is also not equal to the number of the plurality of second output lines 132. Although the first circuit 120 and the second circuit 130 are different circuits, this embodiment can still effectively utilize the upper surface 111 of the flexible substrate 110 by setting the input / output ends of the first circuit 120 and the second circuit 130 in opposite directions, and setting different circuits on the same flexible substrate 110 can make the use of the tape more flexible, for example, a large-area circuit is matched with a small-area circuit, so that the flexible substrate 110 can be more effectively utilized.

[0054] The main purpose of the present invention is to arrange the first circuit 120 and the second circuit 130 arranged side by side on the flexible substrate 110 in opposite directions, so that the narrower first input terminal i1 of the first circuit 120 and the wider second output terminal o2 of the second circuit 130 are arranged on the same edge, and the wider first output terminal o1 of the first circuit 120 and the narrower second input terminal i2 of the second circuit 130 are arranged on the same edge, thereby effectively utilizing the space of the flexible substrate 110 and avoiding increasing the manufacturing cost of the flexible circuit board 100.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A flexible circuit board, characterized in that: Include: The flexible substrate has an upper surface, wherein the upper surface has an upper edge, a lower edge, a first circuit setting area, and a second circuit setting area; A first circuit is arranged in the first circuit arrangement area, wherein the first circuit has a first input terminal and a first output terminal, the first input terminal is adjacent to the lower edge, and the first output terminal is adjacent to the upper edge; as well as The second circuit is arranged in the second circuit arrangement area, wherein the second circuit has a second input terminal and a second output terminal, the second input terminal is adjacent to the upper edge, and the second output terminal is adjacent to the lower edge.

2. The flexible printed circuit board according to claim 1, characterized in that: The first circuit has a plurality of first input lines and a plurality of first output lines, wherein the plurality of first input lines are located at the first input end and arranged along the first input end, and the plurality of first output lines are located at the first output end and arranged along the first output end. The second circuit has a plurality of second input lines and a plurality of second output lines, wherein the plurality of second input lines are located at the second input end and arranged along the second input end, and the plurality of second output lines are located at the second output end and arranged along the second output end.

3. The flexible printed circuit board according to claim 2, characterized in that: The number of the plurality of first input lines is equal to the number of the plurality of second input lines, and the number of the plurality of first output lines is equal to the number of the plurality of second output lines.

4. The flexible printed circuit board according to claim 3, characterized in that: The number of the multiple first output lines is greater than the number of the multiple first input lines, the number of the multiple second output lines is greater than the number of the multiple second input lines, and the number of the multiple first output lines is between 1.4 and 20 times the number of the multiple first input lines, and the number of the multiple second output lines is between 1.4 and 20 times the number of the multiple second input lines.

5. The flexible printed circuit board according to claim 2, characterized in that: The first circuit comprises a first chip, a plurality of first transmission lines and a plurality of second transmission lines, the first chip comprises a first input side and a first output side, the first input side faces the first input end, the first output side faces the first output end, one end of each of the first transmission lines is connected to the first input side of the first chip, the other end of each of the first transmission lines is connected to the first input line, one end of each of the second transmission lines is connected to the first output side of the first chip, and the other end of each of the second transmission lines is connected to the first output line, the second circuit comprises a second chip, a plurality of third transmission lines and a plurality of fourth transmission lines, the second chip comprises a second input side and a second output side, the second input side faces the second input end, the second output side faces the second output end, one end of each of the third transmission lines is connected to the second input side of the second chip, the other end of each of the third transmission lines is connected to the second input line, one end of each of the fourth transmission lines is connected to the second output side of the second chip, and the other end of each of the fourth transmission lines is connected to the second output line.

6. The flexible printed circuit board according to claim 5, characterized in that: The first circuit has a plurality of fifth transmission lines, one end of each of the fifth transmission lines is electrically connected to each of the first input lines, and the other end of each of the fifth transmission lines is electrically connected to each of the first output lines. The second circuit has a plurality of sixth transmission lines, one end of each of the sixth transmission lines is electrically connected to each of the second input lines, and the other end of each of the sixth transmission lines is electrically connected to each of the second output lines.

7. The flexible printed circuit board according to claim 2, characterized in that: The number of the first input lines is not equal to the number of the second input lines, and the number of the first output lines is not equal to the number of the second output lines.

8. The flexible printed circuit board according to claim 1, characterized in that: The upper surface has a left edge, a right edge, a plurality of first chain holes and a plurality of second chain holes, the first chain holes are adjacent to the left edge and arranged along the left edge, the plurality of second chain holes are adjacent to the right edge and arranged along the right edge, wherein the first circuit setting area is located between the left edge and the second circuit setting area, the second circuit setting area is located between the right edge and the first circuit setting area, the plurality of first chain holes are located between the left edge and the first circuit setting area, and the plurality of second chain holes are located between the right edge and the second circuit setting area.

9. The flexible printed circuit board according to claim 8, characterized in that: The first circuit arrangement area has a right bending edge, and the second circuit arrangement area has a left bending edge. The right bending edge of the first circuit arrangement area and the left bending edge of the second circuit arrangement area are arranged side by side and are adjacent to the central axis of the upper surface.

10. The flexible printed circuit board according to claim 9, characterized in that: The first circuit setting area has a left straight edge, and the second circuit setting area has a right straight edge. The left straight edge of the first circuit setting area is adjacent to the left edge of the upper surface, and the plurality of first chain holes are located between the left straight edge and the left edge. The right straight edge of the second circuit setting area is adjacent to the right edge of the upper surface, and the plurality of second chain holes are located between the right straight edge and the right edge.

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