TWI678951B - Flexible circuit board and circuit assembly - Google Patents

Abstract

A flexible circuit board includes a connection portion, an electrical connection portion, a first conductive terminal, a second conductive terminal, and a plurality of intermediate conductive terminals. The connecting portion extends along the connecting direction, and the connecting portion has two sides parallel to the connecting direction. The electrical connecting portion extends along the connecting direction and is connected to the connecting portion. The electrical connecting portion has a lateral top edge, a first beveled edge and a second bevel. Side, the first hypotenuse and the second hypotenuse respectively extend at the endpoints of the two sides of the connection portion, and the distance between the first hypotenuse and the second hypotenuse extends from the endpoint toward the lateral top edge and increases. The first conductive terminal is located at the electrical connection portion and is adjacent to the first oblique side. The second conductive terminal is located at the electrical connection portion and is adjacent to the second oblique side. The plurality of intermediate conductive terminals are located between the first conductive terminal and the second conductive terminal, and are arranged along an arrangement direction. The invention also provides a circuit assembly with a flexible circuit board.

Description

Flexible circuit board and circuit assembly

A planar circuit, especially a flexible circuit board structure. The invention also relates to a circuit assembly including a flexible circuit board structure.

With the continuous development of the panel industry, driving the demand for LCD driver IC packaging, the technology of IC packaging has continued to improve. At present, the driving IC packaging methods include thin-film chip-on-chip packaging (COF), tape-and-reel packaging (TCP), and glass-on-chip. Package (COG) and other methods. Among them, COF is a technology of flip chip bonding (Flip Chip Bonding) on a flexible printed circuit board (FPC) substrate.

Among them, the COF manufacturing process does not need to open holes, so that there is more space on the reel for passive components that were originally placed on the PCB, etc., and become a multifunctional integrated chipset.

However, when a tape-and-reel chipset is combined with a circuit board, peeling often occurs, which affects the yield of production.

An embodiment of the present invention provides a flexible circuit board including a connection portion, an electrical connection portion, a first conductive terminal, a second conductive terminal, and a plurality of intermediate conductive terminals; wherein the connection portion and the electrical connection portion are substantially in the same direction. Extension, which is defined as the connection direction, and the connection portion has two sides parallel to the connection direction; the electrical connection portion extends along the connection direction and is connected to the connection portion. The electrical connection portion has a lateral top edge, a first beveled edge, and a second beveled edge. The lateral top edge is separated from the connecting portion by a first hypotenuse and a second hypotenuse; the first hypotenuse and the second hypotenuse respectively extend at the endpoints of the two sides of the connection, and the first hypotenuse and the second hypotenuse The distance between them increases from the end point towards the lateral top edge.

The first conductive terminal is located at the electrical connection portion and is adjacent to the first beveled edge, the first extending direction of the first conductive terminal is parallel to the first inclined edge; the second conductive terminal is located at the electrical connection portion and is adjacent to the second beveled edge, The second extending direction of the second conductive terminal is parallel to the second oblique side; a plurality of intermediate conductive terminals are located between the first conductive terminal and the second conductive terminal and are arranged along an arrangement direction, wherein the arrangement direction is perpendicular to the connection direction and arranged There is a first included angle between the direction and the first extension direction, and there is a second included angle between the arrangement direction and the second extension direction.

As in the flexible circuit board described above, in one embodiment, the width of the first conductive terminal perpendicular to the first extending direction and the width of the second conductive terminal perpendicular to the second extending direction are respectively larger than the alignment directions of the intermediate conductive terminals. The width.

As in the flexible circuit board described above, in one embodiment, the first oblique edge and the second oblique edge form a first obtuse angle and a second obtuse angle with the two sides of the connection portion, respectively.

As in the flexible circuit board described above, in one embodiment, the electrical connection portion further includes a first longitudinal edge, connecting the first oblique edge and the lateral top edge, and a second longitudinal edge, connecting the second oblique edge and the lateral top edge. .

As in the flexible circuit board described above, in one embodiment, the first beveled edge and the second beveled edge respectively extend to be connected to the lateral top edge.

An embodiment of the present invention further provides a circuit assembly including a substrate and the flexible circuit board of any of the above embodiments.

The substrate includes a bonding area, and the electrical connection portion covers the bonding area. The first conductive terminal, the second conductive terminal, and the intermediate conductive terminal are connected to the bonding area, respectively.

As in the circuit assembly described above, in one embodiment, the first oblique edge and the second oblique edge respectively form a first obtuse angle and a second obtuse angle with the two sides of the connection portion, and the first obtuse angle and the second obtuse angle are on the substrate. The vertical projection position does not extend beyond the substrate.

Through the flexible circuit board and circuit assembly provided by one or more embodiments of the present invention, with this structural design, the lateral tension and vertical tension of the flexible circuit board device on the substrate can be improved, making it difficult to self Peeling from the substrate can improve the problems encountered in the prior art.

It should be understood that, although the terms "first" and "second" may be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, and / or sections should not be affected by these Restrictions on vocabulary. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section.

Please refer to FIG. 1, which is a top view of an embodiment of a flexible circuit board 1 according to the present invention. The flexible circuit board 1 includes a connection portion 12, an electrical connection portion 11, a first conductive terminal 13, a second conductive terminal 14, and a plurality of intermediate conductive terminals 15.

As shown in FIG. 1, the connection portion 12 and the electrical connection portion 11 are made of a flexible insulating material, and are integrally formed into a sheet. The connection portion 12 and the electrical connection portion 11 extend substantially in the same direction. This direction is defined as a connection direction C, that is, the connection portion 12 extends along the connection direction C, and the connection portion 12 has two sides parallel to the connection direction C. 121.

As shown in FIG. 1, the electrical connection portion 11 extends along the connection direction C and is connected to the connection portion 12. The electrical connection portion 11 has a lateral top edge 111, a first beveled edge 112, and a second beveled edge 113. The lateral top edge 111 is separated from the connection portion 12 via the first beveled edge 112 and the second beveled edge 113. The first hypotenuse 112 and the second hypotenuse 113 respectively extend at the end points 122 of the two side edges 121 of the connecting portion 12, and the distance between the first hypotenuse 112 and the second hypotenuse 113 is directed from the end points 122. The lateral top edge 111 extends and increases.

As shown in FIG. 1, the first conductive terminal 13 is located at the electrical connection portion 11 and is adjacent to the first beveled edge 112. The first extending direction L1 of the first conductive terminal 13 is parallel to the first oblique side 112. In contrast, the second conductive terminal 14 is located at the electrical connection portion 11 and is adjacent to the second beveled edge 113. The second extending direction L2 of the second conductive terminal 14 is parallel to the second beveled edge 113. The plurality of intermediate conductive terminals 15 are located between the first conductive terminal 13 and the second conductive terminal 14 and are arranged along an arrangement direction R, wherein the arrangement direction R is perpendicular to the connection direction C, and the arrangement direction R is between the first extension direction L1. It has a first included angle α and a second included angle β between the alignment direction R and the second extending direction L2. The first included angle α and the second included angle β shown in the figure are not used to limit the angle value or proportional relationship. The first included angle α and the second included angle β may have the same angle, or they may have different angles respectively. In the embodiment depicted in the figure, the first included angle α and the second included angle β are acute angles.

In one embodiment, the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 are disposed with a flexible copper foil substrate or other metal thin film attached to the sheet serving as the connection portion 12 and the electrical connection portion. Formed by etching. However, the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 of the present invention are not limited to be configured in this manner. In addition, although not shown in the figure, the connecting portion 12 is further configured with conductive lines, which are respectively connected to the first conductive terminal 13, the second conductive terminal 14, and each intermediate conductive terminal 15.

In addition, as shown in FIG. 1, in this embodiment, the width of the first conductive terminal 13 perpendicular to the first extending direction L1 and the width of the second conductive terminal 14 perpendicular to the second extending direction L2 are larger than the intermediate conductive terminals, respectively. 15 is the width of the alignment direction R. That is, as shown in FIG. 1, the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 are similar to a rectangular structure. The width of the first conductive terminal 13 and the width of the second conductive terminal 14 are larger than those of the intermediate conductive. The width of the terminal 15.

As shown in FIG. 1, in this embodiment, the first oblique edge 112 and the second oblique edge 113 respectively form a first obtuse angle a and a second obtuse angle b with the two side edges 121 of the connecting portion 12. That is to say, when looking at the sheet as the electrical connection portion 11 and the connection portion 12, it can be observed that the connection portion between the electrical connection portion 11 and the connection portion 12, that is, the two end points 122 form a two-retracted structure. The size of the indented structure is not limited, that is, the angle value or ratio of the first obtuse angle a and the second obtuse angle b is not limited.

As shown in FIG. 1, in this embodiment, the electrical connection portion 11 further includes a first longitudinal side 114 and a second longitudinal side 115. The first longitudinal edge 114 connects the first hypotenuse edge 112 and the lateral top edge 111, and the second longitudinal edge 115 connects the second hypotenuse edge 113 and the lateral top edge 111. In some embodiments, the electrical connection portion 11 does not include the first longitudinal edge 114 and the second longitudinal edge 115. Both ends of the lateral top edge 111 are connected to the first oblique edge 112 and the second oblique edge 113 respectively. That is, the first beveled edge 112 and the second beveled edge 113 are respectively extended to be connected to the lateral top edge 111, so that both sides of the electrical connection portion 11 form an acute angle structure.

Although only one connection portion 12 and one electrical connection portion 11 are shown in FIG. 1, in fact, the flexible circuit board 1 may include more than two electrical connection portions 11. For example, in the connection direction C, the connection portion 12 Two electrical connection portions 11 are respectively extended outward at both ends, and each electrical connection portion 11 is provided with a first conductive terminal 13, a second conductive terminal 14 and an intermediate conductive terminal 15, and two conductive lines are arranged in the connecting portion 12 to connect two The conductive terminal of the electrical connection portion 11.

Please refer to FIG. 2 to FIG. 3, which are respectively a top view and a schematic diagram of an embodiment of the circuit assembly 100 according to the present invention. The circuit assembly 100 includes a substrate and the flexible circuit board 1 of the above embodiment.

As shown in FIGS. 2 and 3, the substrate 2 is, for example, a PCB board, and the substrate 2 includes a bonding region 21. A conductive terminal (not shown) corresponding to the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 is disposed on the bonding area 21.

As shown in FIGS. 2 and 3, the electrical connection portion 11 of the flexible circuit board 1 covers the bonding region 21, and the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 are connected to the bonding region 21, respectively. In an embodiment, the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 are different conductive terminals that are pasted or welded to the bonding area 21 respectively, so that the electrical connection portion 11 is fixed to the bonding area 21, and The flexible circuit board 1 and the circuit on the substrate 2 are electrically connected.

It should be noted that in FIG. 2 and FIG. 3, the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 are visible on the upper surface of the electrical connection part 11, so as to describe the first conductive terminal 13 and the second conductive The relative positional relationship between the terminal 14 and the intermediate conductive terminal 15 does not indicate that the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 are disposed on the upper surface of the electrical connection portion 11. To be more clear, in this embodiment, the first conductive terminal 13, the second conductive terminal 14, and the intermediate conductive terminal 15 should be disposed on the lower surface of the electrical connection portion 11, that is, the side facing the substrate 2.

As shown in FIG. 2 and FIG. 3, the width of the electrical connection portion 11 in the connection direction C is the same as the width of the bonding region 21 in the connection direction C, so that the electrical connection portion 11 is entirely located on the substrate 2, and even further in-depth makes it possible The vertical projection positions of the first obtuse angle a and the second obtuse angle b of the flexible circuit board 1 on the substrate 2 do not exceed the substrate 2.

With reference to FIG. 1, when the connecting portion 12 receives a vertical tensile force perpendicular to the substrate 2 and away from the substrate 2, the first oblique edge 112 and the second oblique edge 113 form a first obtuse angle with the two side edges 121 of the connecting portion 12 respectively. a and the second obtuse angle b, the peeling tension of the electrical connection portion 11 will change the direction, and the long sides of the first conductive terminal 13 and the second conductive terminal 14 (parallel to the first beveled edge 112 and the second beveled edge 113) Side) to withstand peeling tension at an angle close to the positive direction, and increase its ability to resist peeling tension. At the same time, the width of the first conductive terminal 13 perpendicular to the first extending direction L1 and the width of the second conductive terminal 14 perpendicular to the second extending direction L2 are also increased to reduce the probability of stripping. When the connecting portion 12 receives a lateral tensile force parallel to the substrate 2 and in the vertical connection direction C, the long sides of the first conductive terminal 13 and the second conductive terminal 14 also receive shear force at an angle close to the positive direction, thereby increasing their resistance. The ability to strip shear.

In some embodiments, different from the embodiment shown in FIG. 1, the distance between adjacent intermediate conductive terminals 15 is relatively large. This structure helps to improve the verticality of the flexible circuit board 1 on the substrate 2. Pull to make it difficult to peel.

Through the flexible circuit board 1 and the circuit assembly 100 formed on the substrate 2 by the flexible circuit board 1 device provided by one or more embodiments of the present invention, the lateral and vertical tensile forces can be compared with The prior art has been improved, so that the flexible circuit board 1 is not easily peeled from the substrate 2.

1‧‧‧ flexible circuit board

11‧‧‧Electrical Connection Department

111‧‧‧ horizontal top edge

112‧‧‧first hypotenuse

113‧‧‧ second hypotenuse

114‧‧‧first longitudinal edge

115‧‧‧ second vertical edge

12‧‧‧ Connection Department

121‧‧‧ side

122‧‧‧ endpoint

13‧‧‧First conductive terminal

14‧‧‧Second conductive terminal

15‧‧‧ intermediate conductive terminal

2‧‧‧ substrate

100‧‧‧circuit assembly

21‧‧‧Combination area

α‧‧‧First angle

β‧‧‧ the second angle

a‧‧‧The first obtuse angle

b‧‧‧ second obtuse angle

C‧‧‧Connection direction

L1‧‧‧First extension direction

L2‧‧‧Second extension direction

R‧‧‧Arrangement direction

[FIG. 1] A top view of an embodiment of a flexible circuit board of the present invention. [FIG. 2] A top view of an embodiment of the circuit assembly of the present invention. [Fig. 3] A schematic diagram of an appearance of an embodiment of a circuit assembly according to the present invention.

Claims (9)

A flexible circuit board includes: a connection portion extending along a connection direction, and the connection portion has two sides parallel to the connection direction; and an electrical connection portion extending along the connection direction and connected to the connection portion Connected, the electrical connection portion has a lateral top edge, a first hypotenuse and a second hypotenuse; the lateral top edge is separated from the connection portion by the first hypotenuse and the second hypotenuse; the first hypotenuse The edge and the second beveled edge respectively extend at the endpoints of the two sides of the connecting portion, and the distance between the first beveled edge and the second beveled edge extends from the endpoints toward the lateral top edge. Increase; a first conductive terminal located at the electrical connection portion and adjacent to the first beveled edge, the entirety of the first conductive terminal is parallel to the first beveled edge along a first extension direction; a second conductive terminal Located at the electrical connection portion and adjacent to the second beveled edge, the entirety of the second conductive terminal is parallel to the second beveled edge along a second extending direction; and a plurality of intermediate conductive terminals are located at the first conductive Arranged between a terminal and the second conductive terminal along an arrangement direction; wherein the arrangement Perpendicular to the connecting direction, the arrangement direction between the first extension having a first angle with the direction, and the arrangement direction extending between the second direction having a second angle. The flexible circuit board according to claim 1, wherein a width of the first conductive terminal perpendicular to the first extending direction and a width of the second conductive terminal perpendicular to the second extending direction are larger than each of the intermediate conductive The width of the terminals in this arrangement direction. The flexible circuit board according to claim 1, wherein the first oblique edge and the second oblique edge form a first obtuse angle and a second obtuse angle with the two sides of the connection portion, respectively. The flexible circuit board according to claim 1, wherein the electrical connection portion further includes: a first longitudinal edge connected to the first beveled edge and the lateral top edge; and a second longitudinal edge connected to the first longitudinal edge Two hypotenuse edges and the horizontal top edge. The flexible circuit board according to claim 1, wherein the first beveled edge and the second beveled edge respectively extend to be connected to the lateral top edge. A circuit assembly includes: a substrate including a bonding area; and a flexible circuit board including: a connection portion extending along a connection direction, and the connection portion has two sides parallel to the connection direction; An electrical connection portion covering the bonding area, the electrical connection portion extending along the connection direction and connected to the connection portion, the electrical connection portion having a lateral top edge, a first beveled edge and a second beveled edge; The lateral top edge is separated from the connecting portion by the first beveled edge and the second beveled edge; the first beveled edge and the second beveled edge respectively extend at the ends of the two side edges of the connection portion, and the The distance between the first hypotenuse and the second hypotenuse extends from the end points toward the lateral top edge, wherein the first hypotenuse and the second hypotenuse are respectively connected to the two sides of the connection portion. Forming a first obtuse angle and a second obtuse angle, and the vertical projection position of the first obtuse angle and the second obtuse angle on the substrate does not exceed the substrate; a first conductive terminal is located at the electrical connection portion and is adjacent to The first hypotenuse, a first extension direction of the first conductive terminal and the first hypotenuse Line, and is connected to the bonding area; a second conductive terminal is located in the electrical connection portion and is adjacent to the second beveled edge, a second extending direction of the second conductive terminal is parallel to the second beveled edge, And are connected to the bonding area; and a plurality of intermediate conductive terminals are located between the first conductive terminal and the second conductive terminal and are arranged along an arrangement direction; wherein the arrangement direction is perpendicular to the connection direction, and the arrangement direction and the There is a first included angle between the first extension directions, and a second included angle between the arrangement direction and the second extension direction. The intermediate conductive terminals are connected to the bonding area. The circuit assembly according to claim 6, wherein a width of the first conductive terminal perpendicular to the first extending direction and a width of the second conductive terminal perpendicular to the second extending direction are larger than each of the intermediate conductive terminals. The width of the arrangement direction. The circuit assembly according to claim 6, wherein the electrical connection portion further includes: a first longitudinal edge connected to the first hypotenuse and the lateral top edge; and a second longitudinal edge connected to the second hypotenuse With that lateral top edge. The circuit assembly according to claim 6, wherein the first hypotenuse and the second hypotenuse respectively extend to be connected to the lateral top edge.