TWM451597U - Double-side bonded touch panel - Google Patents

Abstract

A double-side bonded touch panel includes plural first electrode lines formed on a transparent substrate. Plural connecting-pad pairs correspond to the first electrode lines respectively, and each connecting-pad pair includes separated first connecting pad and second connecting pad. A first end of the first electrode line is connected to the corresponding first connecting pad via a first trace, and a second end of the first electrode line is connected to the corresponding second connecting pad via a second trace.

Description

Double-wound pressed touch panel

This creation relates to a touch panel, and more particularly to a double-sided (two-side) touch panel.

Touch display is an input/output device formed by combining sensing technology and display technology, and is commonly used in electronic devices, such as portable and handheld electronic devices.

A capacitive touch panel is a commonly used touch panel that utilizes a capacitive coupling effect to detect a touch position. When the finger touches the surface of the capacitive touch panel, the capacitance of the corresponding position is changed, and the touch position is detected.

The first A-picture shows a schematic diagram of a conventional touch panel, which is disclosed in Taiwan Patent No. M364913, entitled "Touchpad Line Avoiding Signal Attenuation". The conventional touch panel is mainly composed of a vertical axial electrode array 11A and a horizontal axial electrode array 11B. In order to avoid the attenuation of the signal caused by the excessive impedance, the two ends of the electrode columns 11A, 11B are respectively connected by the wires 12 and 13 and then connected to the connection pad 14, as shown in the first B diagram. formula. Although the architecture shown in the first A/B diagram can reduce the impedance, it is not convenient to use a RC meter to measure the resistance and capacitance of the touch panel.

FIG. 2A shows a schematic diagram of another conventional touch panel, which is also disclosed in the aforementioned Taiwan Patent No. M364913, and the second B diagram shows a single electrode array 11A/B of the second A diagram. Different from the first A/B diagram, both ends of the electrode array 11A/B are respectively connected to the connection pads 14A and 14B by the wires 12 and 13, and the two connection pads 14A and 14B are connected by another wire 15. Electrically connected. The number of connection pads 14A, 14B used in the architecture shown in the second A/B diagram is doubled to that shown in the first A/B diagram, so that the area of the flexible printed circuit board 2 is increased, the cost is also increased, and the limitation is greatly limited. The space required for the design of the organization.

Therefore, it is urgent to propose a novel touch panel that not only reduces the impedance but also increases the number of connection pads and the area of the flexible printed circuit board.

In view of the above, one of the purposes of the present embodiment is to provide a double-wound pressed touch panel, which can achieve the purpose of reducing impedance without increasing the number of connection pads or the area of the connector. In addition, the touch panel can additionally set dummy or virtual connection pads to avoid signal interference or electrical short circuit.

According to the present embodiment, the double-wound pressed touch panel includes a transparent substrate, a plurality of first electrode columns, a plurality of pairs of connection pads, a plurality of first traces, and a plurality of second traces. The first electrode columns are formed on a transparent substrate. The pair of connection pads respectively correspond to the first electrode columns, and each pair of connection pads comprises a first connection pad and a second connection pad, which are disconnected from each other. The first traces respectively correspond to the first electrode columns, and the first ends of the first electrode columns are connected to the corresponding first connection pads by respective first traces. The second traces respectively correspond to the first electrode columns, and the second ends of the first electrode columns are connected to the corresponding second connection pads by corresponding second traces.

The third A diagram shows a schematic diagram of the double side press-fitted touch panel 300 of the first embodiment of the present invention. In the present embodiment, the touch panel 300 includes a plurality of first electrode columns 31 (the third A is illustrated as six first electrode columns 31), which are substantially parallel to each other and formed on the transparent substrate 3. The material of the transparent substrate 3 is an insulating material such as glass, a photosensitive material or polyethylene terephthalate (PET), but is not limited thereto. A plurality of first traces 32, a plurality of second traces 33, and a plurality of connecting pads 34 are formed on the transparent substrate 3, respectively corresponding to the first electrode columns 31. Each of the pair of connection pads 34 includes a first connection pad 341 and a second connection pad 342, and the distance between the two is adjusted as needed for the application. In one embodiment, the distance between the first connection pad 341 and the second connection pad 342 is 10-40 microns, preferably 20 microns. In detail, the first end 311 of the first electrode array 31 is connected to the first connection pad 341 by the first trace 32, and the second end 312 of the first electrode array 31 is connected to the second trace 33. Two connection pads 342. [00010] The third B diagram shows a first electrode array 31 and its corresponding first trace 32, second trace 33, first connection pad 341 and second connection pad 342 in the third A diagram. The third panel B additionally shows a connector 4, such as a flexible printed circuit board (FPC), having a plurality of bonding pads 41 corresponding to the pads 34. When the bonding pad 41 and the connection pad 34 are pressed together, the first connection pad 341 and the second connection pad 342 are electrically connected. According to the touch panel 300 disclosed in FIG. 3A and FIG. 3B, the first trace 32 and the second trace 33 form a double-wound structure, which can be used to reduce the overall impedance of the first electrode array 31. . The first connection pad 341 and the second connection pad 342 are disconnected before being pressed together with the connector 4, and therefore, it is suitable to use a measuring instrument for performing the test of the touch panel 300, for example, using a resistive capacitance. A RC meter is used to measure the resistance and capacitance of the touch panel 300. In contrast, the conventional touch panel (for example, as shown in the first A/B diagram), before the soft circuit board is pressed, the traces at both ends of the electrode column are electrically connected, so that the resistance capacitance measurement cannot be performed. [0001] In addition, after the bonding pad 34 of the embodiment is pressed into the bonding pad 41, the first trace 32 and the second trace 33 at both ends of the first electrode array 31 can be electrically connected. The connector 4 transmits the signal of the touch panel 300 to a controller (not shown). Compared with the conventional touch panel (for example, as shown in the second A/B diagram), the number of the connection pads 34 used in this embodiment is only half of that of the conventional touch panel, thereby reducing the area of the connector 4, not only Reduce costs, simplify processes, and provide more space for institutional design. [00013] FIG. 4A is a schematic view showing the double-wound press-fitted touch panel 400 of the second embodiment of the present invention. Unlike the first embodiment, in this embodiment, in addition to the (vertical direction) complex first electrode array 31A, a plurality of (horizontal) plural second electrode columns 31B are formed. In addition, the insulating block 30 is disposed at a position where the first electrode array 31A and the second electrode array 31B are in contact with each other, so that the first electrode array 31A and the second electrode array 31B are electrically insulated from each other. The first electrode array 31A and the second electrode array 31B may be substantially perpendicular, but are not limited thereto. Wherein, each of the first electrode columns 31A includes a plurality of first electrodes 310A connected in series (for example, six series-connected diamond-shaped electrodes are illustrated); each of the second electrode columns 31B includes a plurality of second electrodes 310B connected in series (for example) Seven series of diamond electrodes are shown in series). [00014] FIG. 4B shows a first electrode array 31A and its corresponding first trace 32A, second trace 33A and connection pad 34A in the fourth A diagram (which includes the first connection pads 341A and the second Connection pad 342A). In a similar situation, the fourth C diagram shows a second electrode array 31B and its corresponding first trace 32B, second trace 33B and connection pad 34B in the fourth A diagram (which includes the first connection pad 341B and the Two connection pads 342B). [00015] The fifth figure shows a simplified block diagram of the touch panel 400 of FIG. The first electrode array 31A and the second electrode array 31B are located in the touch active area 51, and each of the upper and lower sides has an X trace (corresponding to the first trace 32A and the second trace of the first electrode array 31A). 33A), thus forming a double-wound architecture. The left and right sides of the touch active area 51 have Y traces (corresponding to the first trace 32B and the second trace 33B of the second electrode array 31B), and a double-wound architecture is also formed. In the present specification, the X trace is also referred to as a first axial trace, and the Y trace is also referred to as a second axial trace. The fifth figure also shows a dummy trace 52 disposed between the X trace and the Y trace to reduce interference between signals. [00016] According to another feature of this embodiment, a dummy connection pad 35 may be additionally disposed between the connection pads 34A/B or between the connection pads 34A/B and a power pad (such as GND). As illustrated in the sixth figure. When the connection pads 34A/B are pressed against the connector 4, the dummy connection pads 35 can avoid electrical shorts between the connection pads 34A/B or between the connection pads 34A/B and the power pad. [00017] The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the patent application; the equivalent changes or modifications that are not included in the spirit of the disclosure should include It is within the scope of the following patent application.

2‧‧‧Soft printed circuit board
11A‧‧‧Vertical axial electrode column
11B‧‧‧Horizontal axial electrode column
12‧‧‧ wire
13‧‧‧Wire
14‧‧‧Connecting mat
15‧‧‧Wire
300‧‧‧ touch panel
400‧‧‧ touch panel
3‧‧‧Transparent substrate
30‧‧‧Insulation block
31, 31A, 31B‧‧‧ first electrode column
310A‧‧‧first electrode
310B‧‧‧second electrode
311‧‧‧ first end
312‧‧‧ second end
32, 32A, 32B‧‧‧ first line
33, 33A, 33B‧‧‧ second trace
34, 34A, 34B‧‧‧ connection pads
341, 341A, 341B‧‧‧ first connection pad
342, 342A, 342B‧‧‧ second connection pad
35‧‧‧Virtual connection pad
4‧‧‧Connecting parts
41‧‧‧Material pads
51‧‧‧ touch active area
52‧‧‧Virtual Trace

[00018] The first A diagram shows a schematic diagram of a conventional touch panel. The first B-picture shows a single electrode column of the first A-picture. Figure 2A shows a schematic diagram of another conventional touch panel. The second B-picture shows a single electrode column of the second A-picture. FIG. 3A is a schematic view showing the double-wound press-fitted touch panel of the first embodiment of the present invention. Figure 3B shows a single first electrode column of Figure AA. FIG. 4A is a schematic view showing the double-wound press-fitted touch panel of the second embodiment of the present invention. Figure 4B shows a single first electrode column of Figure AA. The fourth C-picture shows a single second electrode column of the fourth A-picture. The fifth figure shows a simplified block diagram of the touch panel of the fourth A. The sixth figure shows the virtual connection pads and the general connection pads.

400‧‧‧ touch panel

31A‧‧‧First electrode column

310A‧‧‧first electrode

32A‧‧‧First line

33A‧‧‧Second line

34A‧‧‧ connection pad

341A‧‧‧First connection pad

342A‧‧‧Second connection pad

4‧‧‧Connecting parts

41‧‧‧Material pads

Claims (9)

A double-side pressed touch panel includes: a transparent substrate; a plurality of first electrode columns formed on the transparent substrate; and a plurality of pairs of connection pads respectively corresponding to the first electrode columns, each The connection pad includes a first connection pad and a second connection pad, which are disconnected from each other; a plurality of first traces respectively corresponding to the first electrode columns, and the first end of the first electrode column is corresponding to the first electrode a first connection pad is connected to the first connection pad; and a plurality of second traces respectively corresponding to the first electrode columns, and the second end of the first electrode column is connected to the corresponding one by the corresponding second trace Second connection pad. A double-wound pressed touch panel according to [Recommendation 1], wherein the transparent substrate comprises an insulating material. A double-wound pressed touch panel according to [Recommendation 2], wherein the insulating material comprises glass, a photosensitive material or polyethylene terephthalate (PET). The double-wound pressed touch panel according to [Recommendation 1] further includes a connecting member including a plurality of bonding pads respectively corresponding to the connecting pads. A double-wound pressed touch panel as described in [Recommendation 4], wherein the connector comprises a flexible printed circuit board (FPC). The double-winding touch panel of the present invention, further comprising a plurality of second electrode columns formed on the transparent substrate, wherein the second electrode column is connected to the corresponding one by the corresponding first trace a first connection pad connected to the corresponding second connection pad by the corresponding second trace. The double-wound pressed touch panel according to [Recommendation 6], wherein the first electrode column includes a plurality of first electrodes connected in series, and each of the second electrode columns includes a plurality of second electrodes connected in series. The double-winding touch panel according to [Recommendation 6] further includes a dummy trace disposed between the first axial trace and the second axial trace, wherein the first axis The trace is formed by the first trace and the second trace of the first electrode columns, and the second axial trace is formed by the first trace and the second trace of the second electrode array Formed. The double-wound-type touch panel as claimed in [Recommendation 1] further includes at least one dummy connection pad disposed between the connection pads or between the connection pad and the power pad.