TWM514181U - A flexible printed circuit board (FPC) and a touch device using the same - Google Patents

Abstract

The invention relates to a flexible printed circuit board (FPC) and a touch device using the same. The FPC has a mounting region, multiple golden fingers and at least two positioning labels are disposed in the mounting region, wherein each positioning label is inserted between the golden fingers. The FPC is correspondingly pressed on and electrically connected to a touch panel (TP) to form the touch device. Because the positioning label is formed on a relatively inner position of the mounting region, when using the positioning label to align the FPC with the TP, the accumulated deviation of position shift between the golden fingers and signal contacts of the TP will be reduced. Therefore, the positioning accuracy between the FPC and the TP is increased to ensure a good electrically connection therebetween.

Description

Flexible circuit board and touch device thereof

This creation is about a flexible circuit board (FPC) and its application touch device, especially for a flexible circuit board that can improve the alignment accuracy.

Please refer to FIG. 9 , which is a schematic plan view of a conventional touch panel. The touch panel includes an operation area 101 and a routing area 102 surrounding the operation area 101 . The electrode has a bonding area 103 in the wiring area 102 on one side of the touch panel. A plurality of signal contacts 104 and two panel alignment targets 105 are disposed inside the bonding area 103, and the two panel alignment targets 105 are respectively located. On the opposite sides of the land 103, the shape of each of the panel alignment targets 105 is L-shaped. Referring to FIG. 10, a flexible circuit board (FPC) for connecting the touch panel includes a bonding area 201. The bonding area 201 has a plurality of gold finger contacts 202 and two circuit board alignment targets 203. The two alignment targets 203 are also distributed on opposite sides of the junction area 201.

Referring to FIG. 11 , when the flexible circuit board is aligned with the touch panel, a plurality of gold finger contacts 202 and the signal contacts 104 are respectively in contact with each other to achieve electrical connection. In the process of the alignment connection, the relative position of the target target 105 and the alignment target 203 of the circuit board can be observed to determine whether the golden finger contact 202 and the signal contact 104 are in proper contact with each other, and when the panel is aligned with the target 105 and When the positions of the board alignment targets 203 overlap, it is determined that the gold finger contacts 202 have corresponding contacts with the signal contacts 104. When the flexible circuit board is aligned with the touch panel, the panel alignment target 105 on both sides and the alignment target 203 of the circuit board are aligned first, and then thermocompression bonding is performed. However, under the action of high temperature and high pressure, the flexible circuit board will have an extension phenomenon and a slight deformation, resulting in the signal contact 104 and the soft electricity on the touch panel. There is a registration deviation between the gold finger contacts 203 on the board. Because the panel alignment target 105 and the board alignment target 203 are used as the reference reference for alignment, and the position of the panel alignment target 105 and the board alignment target 203 is located at the outermost side, the deviation amount is away from the panel pair. The direction of the target 105 and the board alignment target 203 (as indicated by arrows A1 and A2) gradually increases, and the middle portion of the junction 201 will be the place where the cumulative deviation is the greatest.

When the size of the touch panel is increased, the sensitivity requirement is increased, or a specific shape of the sensing electrode is used (for example, a single-layer non-interlaced sensing electrode arrangement), the bonding area of the touch panel and the flexible circuit board may be widened to Increasing the area of the junction area to accommodate more signal contacts and gold finger contacts can be increased by more than ten times. Referring to the flexible circuit board shown in FIG. 12, the width of the land 201 of the flexible circuit board is increased and the area is increased. It can be seen that a large number of gold finger contacts 202 are disposed inside the land 201. As described in the previous paragraph, during the nip process, the amount of alignment deviation will gradually increase in the direction away from the board target 203 (as indicated by arrows A1 and A2), and will be at the middle of the lands 201. Where the cumulative deviation is the largest, the flexible circuit board of Fig. 12 has a problem that the accumulated deviation is more serious because the joint area 201 is large and the golden finger joint 202 is large.

Referring to FIG. 13, a schematic diagram showing the alignment deviation between the signal contact 104 and the golden finger contact 202 is shown. Even if the outermost signal contact 104 and the golden finger contact 202 are correctly aligned, as the deviation displacement is accumulated, The cumulative deviation at the middle of the junction area is the most serious. The signal contact 104 on the touch panel is almost misaligned with the golden finger contact 202 on the flexible circuit board, and the electrical connection or the overlapping area is too small. The touch panel and the flexible circuit board are I am afraid that the signal will not be transmitted properly.

The present invention provides a flexible circuit board to reduce the cumulative deviation of the gold finger contact and the touch panel corresponding to the pressing.

The flexible circuit board of the present invention comprises: a circuit board bonding area disposed on a joint edge of the flexible circuit board; a plurality of gold finger contacts are arranged in parallel along a first direction and spaced apart from the board bonding area; and at least two circuit board alignment targets are disposed along the bonding edge of the board bonding area and interspersed respectively It is disposed between two adjacent gold finger joints.

Since the position of the alignment target of the circuit board is located inside the bonding area instead of the outer edge of the bonding area, when the flexible circuit board is pressed against a touch panel, the target and the touch panel are aligned by the circuit board. The upper panel alignment targets are aligned with each other, so the deviation of the alignment is accumulated from the position of the alignment target of the board to both sides. For the gold finger joint located at the outermost side, the cumulative deviation is still acceptable. Within the range, a good electrical connection relationship can be maintained between each gold finger contact and the touch panel.

10‧‧‧Soft circuit board

11‧‧‧Circuit board junction

12‧‧‧Gold Finger Contact

13‧‧‧Board alignment target

131‧‧‧ reference edge

132‧‧‧Longitudinal line segments

133‧‧‧Horizontal line segments

14‧‧‧ joint edge

Section 15‧‧‧

16‧‧‧ gap

20‧‧‧Touch panel

21‧‧‧ Panel junction area

22‧‧‧Signal contacts

23‧‧‧ Panel alignment target

231‧‧‧ openings

232‧‧‧Longitudinal line segments

101‧‧‧Operating area

102‧‧‧Drop area

103‧‧‧ junction area

104‧‧‧Signal contacts

105‧‧‧ Panel alignment target

201‧‧‧ junction area

202‧‧‧Gold Finger Contact

203‧‧‧Board alignment target

FIG. 1A is a partial plan view showing a first embodiment of the present flexible circuit board.

FIG. 1B is a partial enlarged view of FIG. 1A.

Figure 2 is a partial plan view showing a second embodiment of the present flexible circuit board.

Figure 3: Schematic diagram of the pressing action of the flexible circuit board and the touch panel.

Figure 4: Schematic diagram of the alignment action of the target board and the panel alignment target of the circuit board.

Figures 5A, 5B are plan views of other embodiments of the present application board alignment target.

Figures 6A, 6B are plan views of other embodiments of the authoring panel alignment target.

Figure 7 is a schematic illustration of the alignment of the board alignment target of Figure 5A with the panel alignment target of Figure 6A.

Figure 8 is a schematic illustration of the alignment of the board alignment target of Figure 5B with the panel alignment target of Figure 6B.

Figure 9: Schematic diagram of a conventional touch panel.

FIG. 10 is a schematic plan view of a flexible circuit board electrically connected to a touch panel.

FIG. 11 is a partial schematic view showing the electrical connection between the existing touch panel and the flexible circuit board.

Figure 12: Schematic diagram of another flexible circuit board.

Figure 13: Schematic diagram of the alignment deviation between the touch panel and the flexible circuit board.

Referring to FIG. 1A and FIG. 1B, wherein FIG. 1B is a partial enlarged view of FIG. 1A, the flexible circuit board 10 of the present invention comprises a circuit board bonding area 11, a plurality of gold finger contacts 12 and at least two circuits. The board alignment target 13, this embodiment is exemplified by two circuit board alignment targets 13. The circuit board bonding area 11 is disposed on a bonding edge 14 of the flexible circuit board 10, and the gold finger contacts 12 are arranged in parallel along a first direction (such as the X-axis direction) and are spaced apart from the circuit board bonding area 11, two The board alignment targets 13 are disposed along the bonding edge 14 at the board bonding area 11 and are interposed between the adjacent two gold finger contacts 12, respectively. One end of the gold finger contact 12 is electrically connected to a control center (not shown) through an internal circuit (not shown) of the flexible circuit board 10. The alignment target 13 of the circuit board only functions as a registration mark, and is not controlled. The center is electrically connected.

As shown in a partially enlarged view of FIG. 1B, the position of the board alignment target 13 is not located on the opposite outer sides of the gold finger joint 12 which are arranged in parallel in the board joint region 11, but is moved inward and interspersed in gold. Between the finger contacts 12, in other words, both sides of the board alignment target 13 are adjacent to the gold finger contacts 12. The board alignment target 13 may be of the same material as the gold finger joint 12 and is formed of metal contacts.

In the embodiment shown in FIG. 1, if the total length L of the plurality of gold finger contacts 12 is arranged in parallel, the preferred positions of the two board targets 13 of the present embodiment can be respectively set at four points. One of the total length (1/4L) and three-quarters of the total length (3/4L).

In this creation, when the position of the alignment target 13 of the circuit board is moved from the outside to the inside, when the flexible circuit board 10 is pressed against the touch panel, even if the flexible circuit board 10 is slightly deformed by the hot pressing, the deviation amount is also The position of the board alignment target 13 gradually accumulates in both directions, with one of the board alignment targets 13 of the embodiment of FIG. 1A as a reference, and the gold finger located at the outermost side of the land 11 The contact 12 is farthest from the target 13 of the circuit board, and the distance value is about a quarter (1/4L) of the total length of the golden finger joint 12 arranged in the first direction, so that the outermost gold can be understood. The finger joint 12 has the largest cumulative deviation amount in this embodiment. However, compared to the prior art of FIG. 12, the board alignment target 203 is formed at the outermost side of the land 201, and the gold finger joint 202 located in the middle of the land 201 has the largest accumulated deviation amount, the gold finger joint The distance between the 202 and the target 203 of the board is about one-half of the total length (1/2 L), and the distance value (1/2 L) is significantly larger than the distance value of the creation (1/4 L), so the prior art The maximum cumulative deviation produced by the gold finger joint 202 will be much larger than the maximum cumulative deviation of the creation. In other words, in this creation, the cumulative deviation of the golden finger joint 12 can be reduced, the alignment accuracy between the flexible circuit board 10 and the touch panel can be improved, and the good electrical property between the golden finger contact 12 and the touch panel can be maintained. Connection relationship.

Referring also to FIG. 2, another embodiment of the flexible circuit board 10 is shown. The board bonding area 11 of the flexible circuit board 10 of the present embodiment is further divided into at least two side by side sections 15 by at least one notch 16, that is, arranged in the first direction (X-axis direction) as shown in FIG. The left and right sections are 15. In this regard, the aforementioned two board alignment targets 13 are respectively disposed in two different sections 15, preferably disposed at intermediate positions of the sections 15.

More specifically, the notch 16 is opened from the joint edge 14 of the flexible circuit board 10 toward a second direction (Y-axis direction) perpendicular to the first direction to be parallel to the gold finger joint 12, wherein the depth M is opened by a single one. It is preferred that the length of the gold finger joint 12 is 1 to 3 times. If a length factor of the board land 11 of the flexible circuit board 10 is considered, a plurality of notches 16 may be provided to form a plurality of side-by-side sections 15 having at least one board alignment target 13 in each section 15. In this embodiment, after the flexible circuit board 10 is divided into a plurality of segments 15 by the arrangement of the notches 16, the length of each of the segments 15 is relatively small with respect to the total length of the board land 11 of the flexible circuit board 10, thus When the press cooperative operation is performed, the extension shape variable of each segment 15 is also relatively small, thereby reducing the cumulative deviation amount when the golden finger joint 12 is pressed against the touch panel.

Referring to FIG. 3 , when the touch panel 20 is attached to the flexible circuit board 10 through a conductive adhesive (not shown), the circuit board bonding area 11 of the flexible circuit board 10 can be correspondingly connected to a panel on the touch panel 20 . Junction area 21. The panel junction area 21 includes a plurality of signal contacts 22 disposed in the first direction (X-axis direction) and at least two panel alignment targets 23, wherein the signal contacts 22 respectively correspond to the gold finger contacts 12, and the panel alignment The position of the target 23 is aligned with the board alignment target 13. As shown in Fig. 4, the board alignment target 13 is a rectangular mark in this embodiment. The end of the circuit board alignment target 13 of the present embodiment aligned with the bonding edge 14 is defined as a reference edge 131. The width of the board alignment target 13 is greater than the width of a single gold finger contact 12, for example, three. The width of the gold finger joint 12 makes the board alignment target 13 significantly different from its adjacent gold finger contact 12 for easy viewing and alignment. The corresponding panel alignment target 23 may be a rectangular mark, and a square opening 231 is formed inside one end of the panel alignment target 23, and the opening 231 has a representative in a second direction (Y-axis direction) perpendicular to the first direction. The length D of the alignment error range.

The width W1 of the board alignment target 13 is equal to the width W2 of the panel alignment target 23 (W1=W2), but the length L2 of the panel alignment target 23 is slightly larger than the length L1 of the board alignment target 13 (L2>L1). . When the flexible circuit board 10 is attached to the touch panel 20, the board alignment target 13 is aligned with the panel alignment target 23, because the widths of the two are equal to W1=W2, if the two are aligned at the edge of the Y-axis direction, It can be determined that the alignment is correctly aligned in the X-axis direction; and the alignment of the Y-axis direction can be judged by the position of the reference edge 131 of the board alignment target 13 as long as the reference edge 131 falls within the range of the opening 231 , representing the correct alignment in the Y-axis direction.

Referring to FIGS. 5A and 5B, for other possible embodiments of the board alignment target 13, the board alignment target 13 is composed of a plurality of parallel longitudinal segments 132 and at least one transverse segment 133, in three longitudinal directions. The line segment 132 and a transverse line segment 133 are taken as an example. The width of each longitudinal line segment 132 may be equivalent to the width of a single gold finger joint 12, and the horizontal line segment 133 is perpendicularly connected to each longitudinal line segment 132 to make the circuit board alignment target 13 as a whole. In this case, a grid-like mark is formed. The position of the horizontal line segment 133 is not Alternatively, one end of each longitudinal line segment 132 may be connected as shown in FIG. 5A or at the middle portion of each longitudinal line segment 132 as shown in FIG. 5B. The circuit board alignment target 13 is designed as a grid mark, so that the gap between the adjacent longitudinal line segments 132 can allow the anisotropic conductive adhesive (ACF) during the pressing of the flexible circuit board 10 with the touch panel 20. Filling in, the board alignment target 13 has a uniform force with its adjacent gold finger joint 12. After the horizontal line segment 133 is connected to each of the longitudinal line segments 132, the circuit board alignment target 13 can be formed into a pattern different from the surrounding gold finger contact 12, which can improve the recognition degree of the circuit board alignment target 13 and is beneficial to the golden finger. The junction 12 is separated.

Referring to FIGS. 6A and 6B , in terms of the touch panel 20 , the panel alignment target 23 may be a longitudinal line segment 232 and two along a second direction (Y in a plurality of strips arranged in a first direction (X-axis direction). The axial direction is formed by parallel transverse line segments 233, here exemplified by three longitudinal line segments 232 with two transverse line segments 233. The width of each longitudinal segment 232 is equivalent to the width of a single signal contact 22, and the two transverse segments 233 are perpendicularly connected to the longitudinal segments 232 to define an opening 231. One transverse segment 233 is connected to one end of each longitudinal segment 232. A transverse line segment 233 connects the mid-segment positions of the longitudinal line segments 232, and the two transverse line segments 233 are spaced apart from the aforementioned length D representing the length of the alignment error range. The longitudinal segments 232 may be of equal length or may be of unequal length. For example, one of the longitudinal segments 232 of FIG. 6A is shorter and does not pass through the opening 231, and the longitudinal segment 232 of FIG. 6B passes through the opening 231. Overall, the panel alignment target 23 is also a grid-like mark, which is also advantageous for achieving a uniform force during the pressing process.

The circuit board alignment target 13 and the panel alignment target 23 of the different embodiments described above can be used in combination with each other. For example, the alignment diagram shown in FIG. 7 is the alignment target 13 of the circuit board of FIG. 5A and FIG. 6A. The panel alignment target 23 is used in combination; the alignment diagram shown in FIG. 8 is to combine the board alignment target 13 of FIG. 5B with the panel alignment target 23 of FIG. 6B.

In summary, this creation moves the board alignment target from the original edge inward, so that the board alignment target is interposed between the gold finger contacts on the opposite inner side of the joint area, and in terms of the touch panel. The panel alignment target is also designed to make the phase of the panel alignment target in the junction area. Interspersed between the signal contacts for the inner side. Therefore, the cumulative deviation between the gold finger contact and the signal contact is reduced when the flexible circuit board and the touch panel are pressed together, the alignment accuracy is improved, and the flexible circuit board and the touch panel are ensured to have good performance. Electrical connection.

10‧‧‧Soft circuit board

11‧‧‧Circuit board junction

12‧‧‧Gold Finger Contact

13‧‧‧Board alignment target

14‧‧‧ joint edge

20‧‧‧Touch panel

21‧‧‧ Panel junction area

22‧‧‧Signal contacts

23‧‧‧ Panel alignment target

Claims (15)

A flexible circuit board comprising: a circuit board bonding area disposed on a bonding edge of the flexible circuit board; a plurality of gold finger contacts arranged in parallel along a first direction and spaced apart from the board bonding area; and At least two circuit board alignment targets are disposed along the bonding edge of the circuit board bonding area, and are respectively interposed between two adjacent gold finger contacts. The flexible circuit board of claim 1, wherein the gold finger contacts are arranged in parallel to extend a total length, and the at least two circuit board alignment targets are respectively set at one quarter and three quarters of the total length. At the office. The flexible circuit board of claim 1, wherein the board bonding area is further divided into at least two side-by-side sections by at least one notch, and each of the sections has at least one of the board alignment targets. The flexible circuit board of claim 3, wherein the notch is opened from the bonding edge toward a second direction perpendicular to the first direction, the opening depth of the notch being a single one of the lengths of the gold finger contacts Three times, and the at least two circuit board alignment targets are respectively disposed at intermediate positions of the respective sections. The flexible circuit board of claim 1, wherein each of the circuit board alignment targets is a rectangular mark. The flexible circuit board of claim 1, wherein each of the circuit board alignment targets is a grid mark. The flexible circuit board of claim 6, wherein each of the circuit board alignment targets comprises a plurality of longitudinal line segments and at least one transverse line segment arranged in parallel along the first direction, and the horizontal line segments are vertically connected to the longitudinal line segments. The flexible circuit board of claim 7, wherein each of the circuit board alignment targets comprises three longitudinal line segments and one transverse line segment, the transverse line segments connecting one end of each of the longitudinal line segments, and each of the longitudinal line segments has a width and a single one. The gold finger joints have the same width. The flexible circuit board of claim 7, wherein each of the circuit board alignment targets includes three longitudinal line segments and a transverse line segment, wherein the horizontal line segment is connected to the middle portion of each of the longitudinal line segments, and the width of each of the longitudinal line segments is a single one. The gold finger joints have the same width. A touch device comprising: the flexible circuit board according to any one of claims 1 to 9; and a touch panel having a panel joint region and including a plurality of edges disposed on the panel joint region The first direction is a parallel arrangement of the signal contacts and the at least two panel alignment targets, wherein the touch panel is adhered to the flexible circuit board by a conductive adhesive, and the signal contacts are respectively connected to the plurality of signal contacts. The gold finger contacts, the at least two panel alignment targets are respectively aligned with the at least two circuit board alignment targets. The touch device of claim 10, wherein the panel alignment target is a rectangular mark and has an opening, the width of the panel alignment target being equal to the width of the board alignment target, the opening being perpendicular to The second direction of the first direction has a length representing a range of alignment errors. The touch device of claim 10, wherein the panel alignment target is a grid mark and has an opening, the width of the panel alignment target being equal to the width of the alignment target of the circuit board, the opening being perpendicular to The second direction of the first direction has a length representing a range of alignment errors. The touch device of claim 11 or 12, wherein the alignment target of the circuit board is defined as a reference edge at an end aligned with the joint edge, and the reference edge is attached to the touch on the flexible circuit board. The panel is located within the range of the opening. The touch device of claim 12, wherein the panel alignment target comprises a plurality of longitudinal line segments arranged in parallel along the first direction and two transverse line segments arranged in parallel along the second direction and intersecting the longitudinal line segments, Wherein the two lateral line segments of the panel alignment target are separated from the length representing the length of the alignment error range, and wherein one of the lateral segments of the panel alignment target is connected to one end of the longitudinal segments of the panel alignment target . The touch device of claim 14, wherein the width of each of the longitudinal segments of the panel alignment target is equal to the width of a single one of the signal contacts.