TWM544663U - Touch panel with improved resistance against interference of noise - Google Patents

Description

Touch panel that improves noise immunity

The present invention relates to a touch panel, and more particularly to a touch panel capable of improving the anti-noise interference effect.

As shown in FIG. 5 and FIG. 6 , the touch panel includes a substrate 80 , an electrostatic layer 81 , a shielding layer 82 , and a flexible substrate 90 . The flexible substrate 90 is disposed on the touch panel. On one side of the substrate 80, a sensing area 801 and a routing area 802 are formed on the upper surface of the substrate 80. The sensing area 801 is formed with a plurality of sensing electrodes arranged at intervals, and the wiring area 802 is provided with a plurality of lead wires. The sensing electrodes are electrically connected to the corresponding sensing electrodes and the flexible substrate 90, such that the sensing electrodes are electrically connected to a touch sensing integrated circuit 91 disposed on the flexible substrate 90. The electrostatic layer 81 is disposed on the substrate 80. a surface, and a location is disposed outside the routing area 802 for protecting the sensing area 801 and the routing area 802 from being affected by static electricity. The shielding layer 82 is disposed on a lower surface of the substrate 80; In use, the touch panel is disposed on a display (not shown) of a mobile device (not shown), and the shielding layer 82 is used to protect the noise generated during the operation from the display to protect The touch panel is free from noise interference Reduce touch effect.

In order to reduce the influence of noise from the display, the touch panel of the prior art increases the thickness of the shielding layer 82 to reduce the impedance of the shielding layer 82 and improve the anti-noise interference, but increases the The thickness of the shielding layer 82 may cause the light transmittance to be deteriorated, so that the picture light presented by the display cannot effectively penetrate the touch panel, making the picture dark, blurred, etc., and when the shielding layer 82 is When the thickness is increased such that the light transmittance of the shielding layer 82 is less than 85%, the use quality of the mobile device is seriously affected. Therefore, the prior art can only balance the thickness and transmittance of the shielding layer 82, but How to effectively resist the noise interference of the display without increasing the thickness of the shielding layer 82 and reducing the transmittance is the current improvement of the prior art.

In view of the above problems in the prior art, the present invention provides a touch panel capable of improving the anti-noise interference effect, thereby providing a structure for reducing the impedance of the shielding layer, thereby effectively reducing the noise interference of the display, thereby achieving the lifting touch. The purpose of the control panel's performance.

The touch panel for improving the anti-noise interference effect includes: a substrate having an upper surface and a lower surface; and an electrostatic layer disposed along the periphery of the substrate On the upper surface of the substrate; a shielding layer which is transparent and disposed on the lower surface of the substrate; a plurality of conductive portions respectively disposed between the upper surface and the lower surface of the substrate, two of the conductive portions The terminals are respectively connected to conduct the electrostatic layer and the shielding layer.

According to the above configuration, when the touch panel is disposed on a display of the mobile device, the conductive layer and the shielding layer are connected by the conductive portions to achieve the thickness of the shielding layer without increasing the thickness of the shielding layer. The conductive portion and the electrostatic layer indirectly increase the thickness of the shielding layer, effectively reduce the impedance of the shielding layer to the ground, and reduce noise interference from the display, thereby achieving the purpose of improving the performance of the touch panel.

Referring to FIG. 1 and FIG. 2 , the first preferred embodiment of the present invention includes a first substrate 10 , an electrostatic layer 20 , and a shielding layer ( Shielding layer ). 30. A plurality of conductive portions 40 and a second substrate 50.

The first substrate 10 is transparent and has an upper surface and a lower surface. The upper surface of the first substrate 10 is provided with a sensing area 101 and a routing area 102. The sensing area 101 is provided with a plurality of sensing electrodes arranged at intervals. The routing area 102 is provided with a plurality of leads, one end of which is electrically connected to the corresponding sensing electrode.

The electrostatic layer 20 is disposed on the upper surface of the first substrate 10 along the periphery of the first substrate. The electrostatic layer 20 is used to protect the sensing area 101 and the wiring area 102 from being damaged by static electricity. The electrostatic layer 20 is mainly composed of a conductive material.

The shielding layer 30 is transparent and disposed on the lower surface of the first substrate 10. When the touch panel of the present invention is disposed on a display (not shown) of a mobile device (not shown), the shielding layer 30 is transparent. The shielding layer 30 is used to interfere with the noise generated by the display during the operation of the new touch panel.

In this embodiment, the shielding layer 30 is made of a transparent conductive material; the conductive material may be an ITO (Indium Tin Oxide, ITO, indium tin oxide, indium tin oxide, hereinafter referred to as ITO) conductive material.

The conductive portions 40 are respectively disposed between the upper surface and the lower surface of the first substrate 10 and are arranged at intervals. One end of the conductive portions 40 is connected to the electrostatic layer 20, and the other end of the conductive portions 40 The shielding layer 30 is connected, and the electrostatic layer 20 and the shielding layer 30 are connected to each other through the conductive portions 40.

In this embodiment, the conductive portions 40 are mainly formed with a via hole formed in the electrostatic layer 20, the first substrate 10, and the shielding layer 30, and are respectively filled in the via holes to have a The conductive conductive material is formed to connect and electrically connect the electrostatic layer 20 and the shielding layer 30; the conductive material may be a silver paste.

The second substrate 50 is disposed on the lower side of the upper surface of the first substrate 10, and is grounded together with the electrostatic layer 20 (not shown). The second substrate 50 is provided with a touch sensing integrated circuit 51. The other end of the lead wire on the wiring area 102 is electrically connected to the second substrate 50 and electrically connected to the touch sensing integrated circuit 51. In this embodiment, the second substrate 50 is a flexible circuit. Flexible Print Circuit (FPC).

To illustrate the result of the grounding impedance measured by the shielding layer 30 of the conductive layer 40 with or without the touch panel, please refer to FIG. 3 for the purpose of measuring the shielding layer 30 for measurement. The position of the 25 measuring points of the shielding layer 30 to the ground impedance is measured. When the conductive layer 40 is not disposed on the touch panel, the ground impedance of the 25 measuring points selected by the shielding layer 30 is measured. The result is shown in the following table 1:         <TABLE border="1" borderColor="#000000" width="_0002"><TBODY><tr><td> Table 1 </td></tr><tr><td> Location</td>< Td> resistance value (Ω) </td><td> position </td><td> resistance value (Ω) </td><td> position </td><td> resistance value (Ω) </td ><td> Location </td><td> Resistance (Ω) </td><td> Location </td><td> Resistance (Ω) </td></tr><tr><td > 1 </td><td> 823 </td><td> 6 </td><td> 593 </td><td> 11 </td><td> 553 </td><td> 16 </td><td> 555 </td><td> 21 </td><td> 756 </td></tr><tr><td> 2 </td><td> 668 </td ><td> 7 </td><td> 470 </td><td> 12 </td><td> 447 </td><td> 17 </td><td> 460 </td>< Td> 22 </td><td> 586 </td></tr><tr><td> 3 </td><td> 625 </td><td> 8 </td><td> 436 </td><td> 13 </td><td> 412 </td><td> 18 </td><td> 433 </td><td> 23 </td><td> 563 </ Td></tr><tr><td> 4 </td><td> 611 </td><td> 9 </td><td> 418 </td><td> 14 </td>< Td> 353 </td><td> 19 </td><td> 413 </td><td> 24 </td><td> 560 </td></tr><tr><td> 5 </td><td> 788 </td><td> 10 </td><td> 472 </td><td> 15 </td><td> 224 </td><td> 20 </ Td><td> 473 </td><td> 25 </td><td> 703 </td></tr></ TBODY></TABLE>

When the touch panel has the conductive portions 40, the result of the ground impedance of the 25 measurement points selected by the shield layer 30 is as shown in the following table 2:         <TABLE border="1" borderColor="#000000" width="_0003"><TBODY><tr><td> Form 2 </td></tr><tr><td> Location</td>< Td> resistance value (Ω) </td><td> position </td><td> resistance value (Ω) </td><td> position </td><td> resistance value (Ω) </td ><td> Location </td><td> Resistance (Ω) </td><td> Location </td><td> Resistance (Ω) </td></tr><tr><td > 1 </td><td> 433 </td><td> 6 </td><td> 322 </td><td> 11 </td><td> 307 </td><td> 16 </td><td> 309 </td><td> 21 </td><td> 404 </td></tr><tr><td> 2 </td><td> 381 </td ><td> 7 </td><td> 315 </td><td> 12 </td><td> 317 </td><td> 17 </td><td> 315 </td>< Td> 22 </td><td> 334 </td></tr><tr><td> 3 </td><td> 421 </td><td> 8 </td><td> 313 </td><td> 13 </td><td> 312 </td><td> 18 </td><td> 301 </td><td> 23 </td><td> 355 </ Td></tr><tr><td> 4 </td><td> 375 </td><td> 9 </td><td> 316 </td><td> 14 </td>< Td> 277 </td><td> 19 </td><td> 295 </td><td> 24 </td><td> 401 </td></tr><tr><td> 5 </td><td> 416 </td><td> 10 </td><td> 340 </td><td> 15 </td><td> 205 </td><td> 20 </ Td><td> 293 </td><td> 25 </td><td> 501 </td></tr></ TBODY></TABLE>

According to the results of the ground impedance of the 25 measurement points selected by the shielding layer 30, the measured or not the conductive portions 40 are provided on the touch panel as described in Tables 1 and 2 above. The impedance of the ground layer of the shielding layer 30 of the touch panel in which the conductive portions 40 are not provided is higher than the impedance of the shield layer 30 of the touch panel provided with the conductive portions 40. Therefore, the grounding resistance is high. The conductive portion 40 connects the electrostatic layer 20 and the shielding layer 30, and the ground impedance of the shielding layer 30 can be effectively reduced without increasing the thickness of the shielding layer 30.

In order to illustrate a second preferred embodiment of the touch panel of the present invention which can improve the anti-noise interference effect, please refer to FIG. 4, which is substantially the same as the first preferred embodiment. The second preferred embodiment is provided with a greater number of conductive portions 40. By providing a larger number of conductive portions 40, the impedance of the shielding layer 30 can be more effectively reduced to further enhance the shielding layer 30 against the display. The effect of noise interference generated.

According to the above configuration, the conductive layer 40 is disposed on the first substrate 10 to connect the electrostatic layer 20 and the shielding layer 30, thereby not only increasing the thickness of the shielding layer 30, but not The light transmittance of the shielding layer 30 is reduced, and the impedance of the shielding layer 30 to the ground is effectively reduced to improve the ability of the shielding layer 30 to resist the noise interference generated by the display during the operation, thereby effectively reducing The noise interferes with the touch effect of the touch panel to improve the performance of the touch panel.

10‧‧‧First substrate
101, 801‧‧‧ Sensing area
102,802‧‧‧Drop area
20,81‧‧‧Electrostatic layer
30,82‧‧‧Shield
40‧‧‧Electrical Department
50‧‧‧second substrate
51,91‧‧‧Touch sensing integrated circuit
80‧‧‧Substrate
90‧‧‧Soft substrate

1 is a schematic view of a first preferred embodiment of the present invention. Figure 2 is a cross-sectional view taken along line A-A of Figure 1 of the first preferred embodiment of the present invention. 3 is a schematic diagram of measuring the impedance position on the shield layer in the first preferred embodiment of the present invention. Figure 4 is a schematic illustration of a second preferred embodiment of the present invention. FIG. 5 is a schematic diagram of a conventional touch panel. Figure 6 is a schematic cross-sectional view taken along line B-B of Figure 5.

10‧‧‧First substrate

101‧‧‧ Sensing area

102‧‧‧Drop area

20‧‧‧Electrostatic layer

40‧‧‧Electrical Department

50‧‧‧second substrate

51‧‧‧Touch-sensitive integrated circuit

Claims (10)

A touch panel capable of improving anti-noise interference effects, comprising: a first substrate having an upper surface and a lower surface; and an electrostatic layer disposed on an upper surface of the first substrate along a circumference of the first substrate a shielding layer, which is transparent and disposed on a lower surface of the first substrate; a plurality of conductive portions respectively disposed between the upper surface and the lower surface of the first substrate, the two ends of the conductive portions respectively The connection turns on the electrostatic layer and the shielding layer. The touch panel of claim 1 , wherein the conductive portions form a conductive hole, and a conductive material is disposed in the conductive holes. The touch panel of claim 2, wherein the conductive material is a silver paste. The touch panel of claim 1 , wherein the upper surface of the first substrate is provided with a sensing area and a routing area, and the static layer is disposed outside the routing area. The touch panel of claim 4, wherein the sensing area is provided with a plurality of sensing electrodes arranged at intervals; the wiring area is provided with a plurality of leads, and the leads are electrically connected to Corresponding sensing electrodes. The touch panel of claim 5, wherein a second substrate is disposed on one side of the first substrate, and a touch sensing integrated circuit is disposed on the second substrate. They are electrically connected to the second substrate and electrically connected to the touch sensing integrated circuit. The touch panel of claim 6, wherein the second substrate is a flexible circuit board. The touch panel according to any one of claims 1 to 7, wherein the shielding layer is a transparent conductive material. The touch panel of claim 8 is characterized in that the conductive material of the shielding layer is an ITO conductive material. The touch panel according to any one of claims 1 to 7, wherein the first substrate is transparent, and the electrostatic layer is mainly composed of a conductive material.