TWI452507B - Touch apparatus and touch sensing method thereof - Google Patents

Description

Touch device and touch sensing method thereof

The present invention relates to a touch device and a touch sensing method thereof, and more particularly to a touch device capable of eliminating low frequency noise and a touch sensing method thereof.

In order to make the portable information product have a more user-friendly interface, integrating a touch panel or a touch pad has become a trend. Relevant panel manufacturers and IC design companies have already listed the technology of touch panel as the main R&D project. Relevant technologies and products have also been applied to electronic products in daily life, such as mobile phones, computers and personal mobile assistants. And other information products.

At present, the most commonly used touch devices are mainly divided into resistive and capacitive. The main working principle of the capacitive touch device is to induce an electrical characteristic called a capacitor. When two layers of electrically conductive objects approach each other without touching, their electric fields interact to form a capacitance. The upper and lower surface of the touch panel structure are respectively conductive layers formed by electrode lines in a staggered direction. The finger is also an electrical conductor. When the finger is placed on the touchpad, a very small capacitance is formed between the electrode line of the touchpad and the finger. The position of the touched by the user is detected by the microprocessor by the change of the capacitance value.

Since the capacitive touch device is susceptible to environmental changes, such as low-frequency noise generated when a finger or other object touches, the electronic device is misjudged and wastes power.

The invention provides a touch device and a touch sensing method thereof, which can effectively remove low frequency noise in the sensing signal, such as finger noise or other low frequency noise caused by touching objects.

The present invention provides a touch device including a sensing line, a first touch unit, a second touch unit, a sensing module, and a control unit. The sensing line is disposed on a touch panel. The first touch unit is disposed on the touch panel and coupled to the sensing line, wherein the first touch unit is driven during a first line scan. The second touch unit is disposed on the touch panel and coupled to the sensing line, wherein the second touch unit is driven during a second line scan. The sensing module is coupled to the sensing line, wherein the sensing module detects the first touch unit through the sensing line during the first line scanning to output a first original signal. The sensing module detects the second touch unit through the sensing line during the second line scanning to output a second original signal. The control unit is coupled to the sensing module, and obtains a reference signal according to the second original signal, and subtracts the reference signal from the first original signal to obtain the sensing signal of the first touch unit.

In one embodiment of the present invention, the touch control device further includes a third touch unit disposed on the touch panel and coupled to the sensing line, and the third touch unit is driven during a third line scan. . The sensing module detects the third touch unit through the sensing line to output a third original signal during the third line scanning, and the control unit obtains the reference signal according to the second original signal and the third original signal.

In an embodiment of the invention, the control unit calculates an average or weighted average of the second original signal and the third original signal as a reference signal.

In one embodiment of the present invention, the touch device further includes a plurality of third touch units disposed on the touch panel and coupled to the sensing lines. The first touch unit, the second touch unit, and the plurality of third touch units are each driven during different line scans. The sensing module detects the plurality of third touch units during the different line scans through the sensing line to output a plurality of third original signals. The control unit determines the reference signal according to the second original signal and the plurality of third original signals.

In an embodiment of the invention, the control unit calculates an average or weighted average of the second original signal and the plurality of third original signals as a reference signal.

In one embodiment of the invention, the first touch unit includes a first sensing capacitor, one end of the first sensing capacitor is coupled to a first scan line, and the other end is coupled to the sensing line. The second touch unit includes a second sensing capacitor. One end of the second sensing capacitor is coupled to a second scan line, and the other end is coupled to the sensing line.

In an embodiment of the invention, the sensing module includes a first capacitor and an operational amplifier. The inverting input terminal of the operational amplifier is coupled to the first end of the first capacitor and the sensing line, the non-inverting input end of the operational amplifier is coupled to a reference voltage, and the output end of the operational amplifier is coupled to the first capacitor Two ends and a control unit.

The present invention also provides a noise cancellation method for a touch device, wherein the touch device includes a sensing line, a first touch unit, and a second touch unit. The noise cancellation method includes driving the first touch unit during a first line scan. The first touch unit is detected through the sensing line during the first line scan to obtain a first original signal. Driving the second touch unit during a second line scan. The second touch unit is detected through the sensing line during the second line scan to obtain a second original signal. A reference signal is obtained according to the second original signal. The reference signal is subtracted from the first original signal to obtain a sensing signal of the first touch unit.

In an embodiment of the invention, the first touch unit and the second touch unit are adjacent to each other.

In an embodiment of the invention, the first line scan period and the second line scan period are temporally adjacent to each other.

In an embodiment of the invention, the reference signal is a second original signal.

In one embodiment of the present invention, the touch device further includes a third touch unit, and the noise canceling method further includes: driving the third touch unit during a third line scan. The third touch unit is detected through the sensing line during the third line scanning to obtain a third original signal. The reference signal is obtained according to the second original signal and the third original signal.

In an embodiment of the invention, the step of determining the reference signal according to the second original signal and the third original signal comprises: calculating an average value or a weighted average value of the second original signal and the third original signal. The average value or the weighted average value is used as a reference signal.

In one embodiment of the present invention, the touch device further includes a plurality of third touch units, and the noise canceling method further includes: driving the plurality of third touch units separately during different line scans. The plurality of third touch units are respectively detected through the sensing lines during the different line scans to output a plurality of third original signals. And determining the reference signal according to the second original signal and the plurality of third original signals.

In an embodiment of the present invention, the step of determining the reference signal according to the second original signal and the plurality of third original signals includes: calculating an average value or a weighted average of the second original signal and the plurality of third original signals value. The average value or the weighted average value is used as a reference signal.

In an embodiment of the invention, the first touch unit includes a first sensing capacitor, and the second touch unit includes a second sensing capacitor.

Based on the above, the present invention detects a touch unit on the scan line during different scans to obtain a first original signal and a second original signal, and obtains a reference signal according to the second original signal, and uses the first original signal and the reference. The signal is subtracted to remove the low frequency noise contained in the first original signal to obtain the sensing signal of the first touch unit, thereby improving the correctness of determining the touch position.

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1 is a schematic diagram of a touch device according to an embodiment of the invention. Referring to FIG. 1 , the touch device 100 includes n scan lines P1 P Pn, m sense lines S1 S Sm, multiple touch units T (x, y), a driving module 101, and a sensing module 102. And a control unit 104, wherein the scan lines P1~Pn and the sensing lines S1~Sm are disposed on a touch panel 106, and the touch unit T(x, y) represents the intersection of the xth scan line and the yth sense line At the touch unit, n, m, x, and y are positive integers, and 1≦x≦n, 1≦y≦m. In addition, the sensing module 102 is coupled to the sensing lines S1 S Sm and the control unit 104 .

The touch unit T(x, 1) on the sensing line S1 can receive the driving signals D1 D Dn and be driven during different line scans, respectively. For example, FIG. 2 is a schematic diagram showing waveforms of driving signals of scanning lines P1 to Pn according to an embodiment of the invention. Referring to FIG. 2, the low-level period of each of the driving signals D1~Dn is the line scanning period of the corresponding scanning lines P1~Pn. For example, the low-level period of the driving signal D1 is the line scanning of the scanning line P1. During the period LS1, the low-level period of the driving signal D2 is the line scanning period LS2 of the scanning line P2, and so on. All touch units T(1,1)~T(1,m) on the scan line P1 are driven during the line scan period LS1 (that is, the period during which the drive signal D1 is at a low voltage level) (or turned on, turn on And all the touch units T(2,1)~T(2,m) on the scan line P2 are driven during the line scan period LS2 (that is, the period during which the drive signal D2 is at the low voltage level) (or Open, turn on). Similarly, the touch units T(3, 1)~T(n, 1) on the other scan lines P3~Pn are also driven by the drive signals D3~Dn, respectively. The sensing module 102 detects the sensing lines S1 to Sm to output a plurality of original signals ST(x, 1) to ST(x, m) in the line scanning periods LS1 to LSn of the respective scanning lines P1 to Pn.

To simplify the description, the implementation details of this embodiment will now be described taking the sensing line S1 as an example. The other sensing lines S2 to Sm can refer to the relevant description of the sensing line S1. The sensing module 102 senses the touch units T(1, 1), T(2, 1), . . . on the scan lines P1 P Pn through the sensing line S1 during the line scan period of each of the scan lines P1 P Pn, respectively. ., T(n-2, 1), T(n-1, 1), T(n, 1), to output a plurality of original signals ST(x, 1). For example, the sensing module 102 detects the touch unit T(1, 1) through the sensing line S1 during the line scan period LS1 of the scan line P1 to output a first original signal ST(1, 1), and on the scan line P2. During the line scan, the LS2 detects the touch unit T (2, 1) through the sensing line S1 and outputs a second original signal ST (2, 1). Similarly, during the line scan of the other scan lines P3 to Pn, the LS3~LSn sensing module 102 also detects the corresponding touch units T(3,1)~T(n,1) on the sensing line S1 and outputs the same. Corresponding original signals ST(3,1)~ST(n,1).

After receiving the original signals ST(1,1)~ST(n,1) of the sensing module 102, the control unit 104 obtains a reference signal according to the original signals. For example, an original signal is selected as the reference signal in the original signals ST(1,1)~ST(n,1), and the second original signal ST(2,1) can be selected as a reference here. Signal. After selecting the reference signal, the control unit 104 further subtracts the reference signal (that is, the second original signal ST(2, 1)) from the first original signal ST(1, 1) to remove the first original signal ST ( The low frequency noise included in 1,1) obtains the sensing signal of the touch unit T(1,1). Similarly, the sensing signals of the other touch units T (2, 1) to T (n, 1) can also be obtained in the same manner, and are not described herein again.

In this embodiment, the control unit 104 can use the two original signals adjacent in time to subtract each other for noise cancellation. For example, during the line scan period, LS1 and LS2 are adjacent in time, so the original signal ST(2, 1) of the LS2 during the line scan period can be used as the reference signal of the original signal ST(1, 1) of the line scan period LS1. The control unit 104 can subtract the reference signal (that is, ST(1,1)-ST(2,1)) from the first original signal ST(1,1) of the line scanning period LS1 to obtain the touch unit T(1). , 1) the sensing signal. By analogy, for example, the sensing signal of the touch unit T (2, 1) is ST (2, 1)-ST (3, 1), and the sensing signal of the touch unit T (n-2, 1) is ST(n-2,1)-ST(n-1,1). In other embodiments, the first original signal ST(1, 1) can be used as the reference signal of the second original signal ST(2, 1). The control unit 104 can subtract the reference signal (that is, ST(2,1)-ST(1,1)) from the second original signal ST(2,1) to obtain the sense of the touch unit T(2,1). Test signal. By analogy, for example, the sensing signal of the touch unit T(n-1, 1) is ST(n-1, 1)-ST(n-2, 1), and the touch unit T(n, 1) The sensing signal is ST(n, 1)-ST(n-1, 1).

Alternatively, the control unit 104 can subtract the original signals of the two touch units adjacent in space to cancel the noise cancellation. For example, the touch unit T (1, 1) is spatially adjacent to the T (2, 1), so the original signal ST (2, 1) of the touch unit T (2, 1) can be used as the touch unit T. Reference signal for (1,1). The control unit 104 can subtract the reference signal (that is, ST(1,1)-ST(2,1)) from the first original signal ST(1,1) of the touch unit T(1,1) to obtain the touch. The sensing signal of the control unit T (1, 1). By analogy, for example, the sensing signal of the touch unit T (2, 1) is ST (2, 1)-ST (3, 1), and the sensing signal of the touch unit T (n-2, 1) is ST(n-2,1)-ST(n-1,1). In other embodiments, the original signal ST(1,1) of the touch unit T(1,1) can be used as a reference signal of the touch unit T(2,1). The control unit 104 can subtract the reference signal (that is, ST(2,1)-ST(1,1)) from the original signal of the touch unit T(2,1) to obtain the touch unit T(2,1). Sensing signal. By analogy, for example, the sensing signal of the touch unit T(n-1, 1) is ST(n-1, 1)-ST(n-2, 1), and the touch unit T(n, 1) The sensing signal is ST(n, 1)-ST(n-1, 1).

In addition, the sensing signal obtaining manner of the touch unit T(x, 1) on the sensing line S1 can also be analogized to the touch units T(x, 2)~T(x, m) on the other sensing lines S2~Sm. For example, the sensing module 102 can detect the touch units T(x, 2)~T(x, m) on the sensing lines S2~Sm and output a plurality of original signals ST(x, 2)~ST(x). , m), and then find the corresponding reference signal and sensing signal, the details of which are not repeated here.

After the corresponding sensing signal is obtained by removing the low frequency noise of the original signals of the respective touch units, the remaining high frequency noise in the sensing signal can utilize a low pass filter and a digital signal processor (Digital Signal Processor, A DSP) filter (not shown) is used to filter out. In this way, the control unit 104 can determine the correct touch position according to the sensing signal after removing the high frequency noise and the low frequency noise.

It should be noted that the waveforms of the driving signals D1~Dn are not limited to the driving waveforms as shown in FIG. 2, that is, the scanning lines P1~Pn are not limited to be in accordance with P1, P2, ..., Pn-2, Pn-1. , the order of Pn is enabled. For example, it is also possible to drive/enable odd-numbered scan lines (eg, P1, P3, ...) and then drive/enable even-numbered scan lines (eg, P2, ...). In this example, the original signal ST(1,1) of the touch unit T(1,1) is temporally adjacent to the original signal ST(3,1) of the touch unit T(3,1), so The original signal ST(3,1) can be used as the reference signal of the original signal ST(1,1). The control unit 104 can subtract the reference signal (that is, ST(1,1)-ST(3,1)) from the original signal of the touch unit T(1,1) to obtain the touch unit T(1,1). Sensing signal. By analogy, the sensing signals of the remaining touch units can be obtained. In other embodiments, the first original signal ST(1, 1) can be used as the reference signal of the third original signal ST(3, 1). The control unit 104 can subtract the reference signal (that is, ST(3,1)-ST(1,1)) from the third original signal ST(3,1) to obtain the sense of the touch unit T(2,1). Test signal.

Alternatively, the reference signal can be derived from the original signal generated during two or more line scans. For example, the control unit 104 may perform an average value or a weighted average of the original signals ST(2, 1) to ST(3, 1) corresponding to the touch units T(2, 1) to T(3, 1). For the reference signal of the touch unit T (1, 1), the sensing signal of the touch unit T (1, 1) is obtained, for example, ST (1, 1) - [ST (2, 1) + ST ( 3,1)]/2, and the sensing signal of the touch unit T(n-2,1) is ST(n-2,1)-[ST(n-1,1)+ST(n,1) ]/2. Alternatively, the control unit 104 uses the average or weighted average of the original signals ST(1,1)~ST(2,1) of the touch units T(1,1)~T(2,1) as the touch. The reference signal of the unit T (3, 1) is obtained, and the sensing signal of the touch unit T (3, 1) is obtained, for example, ST (3, 1) - [ST (1, 1) + ST (2, 1) )]/2, and the sensing signal of the touch unit T(n, 1) is ST(n, 1)-[ST(n-2, 1)+ST(n-1, 1)]/2.

In other embodiments, the control unit 104 performs an average operation or a weighted average calculation on the original signals of all the touch units of the same sensing line to obtain a reference signal. For example, the control unit 104 uses the average or weighted average of the original signals ST(2, 1)~ST(n, 1) of the touch units T(2, 1)~T(n, 1) as the touch unit. Reference signal of T(1,1). Alternatively, the control unit 104 uses the average or weighted average of the original signals ST(1,1)~ST(n,1) as all the touch units T(1,1)~T(n, of the sensing line S1. 1) Reference signal.

FIG. 3 is a schematic diagram of a touch device according to another embodiment of the present invention. For the present embodiment, reference may be made to the related description of FIG. 1 and FIG. 2 described above. Referring to FIG. 3, in the touch device 300 of the embodiment, each touch unit T(x, y) is implemented by using a sensing capacitor Cs(x, y), wherein each sensing capacitor Cs(x, y) One end is coupled to the corresponding scan line, and the other end is coupled to the corresponding sense line. For example, one end of the sensing capacitor Cs (1, 1) is coupled to a scan line P1, and the other end is coupled to the sensing line S1; one end of the sensing capacitor Cs (2, 1) is coupled to a scan line P2, and One end is coupled to the sensing line S1, and so on.

In addition, the sensing module 102 includes a plurality of first capacitors C1 and a plurality of operational amplifiers A1 to Am. The inverting input terminals of the operational amplifiers A1 to Am are respectively coupled to the first ends of the sensing lines S1 to Sm and the corresponding first capacitor C1, and the non-inverting input terminals of the operational amplifiers A1 to Am are coupled to a reference voltage Vref. In addition, the output ends of the operational amplifiers A1 to Am are coupled to the second end of the corresponding first capacitor C1 and the control unit 104.

It is assumed that the driving signals D1~Dn in this embodiment are the driving signals D1~Dn shown in FIG. 2, wherein the driving signals D1~Dn are in the line scanning period of the scanning line at the low level, and the driving signals D1~Dn are high and low. The voltage level difference is ΔV. As shown in FIG. 3, it is assumed that the touch position of the user's finger on the touch panel 106 is the intersection of the scan line Pn-2 and the sensing line Sm, that is, the touch unit T(n-2, m). The difference in capacitance caused by the user's finger on the sensing capacitance Cs(n-2, m) of the touch unit T(n-2, m) is ΔC.

The operational amplifiers A1~Am detect the touch units on the corresponding scan lines during different line scans to output a plurality of original signals. It is assumed here that the capacitance value of all the sensing capacitors is Cs. For example, when the scan line Pn-2 is enabled, the operational amplifiers A1~Am output the original signal ST(n-2, of the touch unit T(n-2,1)~T(n-2,m), 1) ~ ST (n-2, m) to the control unit 104, the voltage values are V (n-2, 1) ~ V (n-2, m). The voltage value V(n-2, m-1) of the original signal ST(n-2, m-1) can be expressed by the following formula:

The VN(n-2, m-1) is the operational amplifier Am-1 detecting the miscellaneous signal in the original signal ST(n-2, m-1) output by the touch unit T(n-2, m-1). Signal voltage. Similarly, the voltage value V(n-2, m) of the original signal ST(n-2, m) can be expressed by the following equation:

The VN(n-2,m) is the operational amplifier Am detects the noise voltage in the original signal ST(n-2,m) output by the touch unit T(n-2,m), and the VFN is the finger. The noise voltage caused when the touch panel 106 is touched.

In addition, when the scan line Pn-1 is enabled, the operational amplifiers A1 to Am output the original signals ST(n-1, 1) of the touch units T(n-1, 1)~T(n-1, m). ~ST(n-1,m), and the voltage values of the original signals ST(n-1,1)~ST(n-1,m) are V(n-1,1)~V(n-1 respectively) , m). The voltage value V(n-1, m-1) of the original signal ST(n-1, m-1) can be expressed by the following formula:

The VN(n-1, m-1) is used by the operational amplifier Am-1 to detect the miscellaneous signals in the original signal ST(n-1, m-1) output by the touch unit T(n-1, m-1). Signal voltage. Similarly, the voltage value V(n-1, m) of the original signal ST(n-1, m) when the scan line Pn-1 is enabled can be expressed by the following equation:

The VN(n-1,m) is the operational amplifier Am detecting the noise voltage in the original signal ST(n-1,m) output by the touch unit T(n-1,m), and the VFN is the finger. The noise voltage caused when the touch panel 106 is touched.

In this embodiment, the original signal ST(n-1, m) located on the same sensing line Sm can be set as the reference signal of the original signal ST(n-2, m). The control unit 104 can remove the low frequency noise in the original signal ST(n-2, m) by subtracting the original signal ST(n-2, m) from the corresponding reference signal ST(n-1, m). By analogy, the control unit 104 can respectively use the original signals ST(n-2, 1)~ST(n-2, m-1) and the corresponding reference signals ST(n-1, 1)~ST(n -1, m-1) subtracts to remove low frequency noise in the original signal ST(n-2,1)~ST(n-2,m-1). For example, the voltage value ΔV(n-2, m-1) of the sensing signal ST'(n-2, m-1) after removing the low frequency noise in the embodiment may be as follows:

The VHN(n-2, m-1) is the high frequency noise voltage in the sensing signal ST'(n-2, m-1) after the low frequency noise is removed. In addition, the voltage value ΔV(n-2, m) of the sensing signal ST'(n-2, m) after removing the low frequency noise can be expressed as follows:

among them The sensing voltage difference caused by the finger touching the touch panel 106, and VHN(n-2,m) is the high frequency noise in the original signal ST(n-2,m) after removing the low frequency noise. Voltage. The noise voltage VFN (low frequency noise) caused by the finger in the original signal ST (n-2, m) can be removed.

Similarly, the sensing signals of other touch units can be obtained in a similar manner, and therefore will not be described again.

After the original signal is subtracted from the corresponding reference signal by the control unit 104, only the high frequency noise voltage and the sensing voltage difference caused by the finger touching the touch panel 106 are left in the obtained sensing signal. The high-frequency noise voltage can be easily filtered by a low-pass filter or a DSP filter (not shown) of the prior art, so that the sensing signal is only caused by the finger touching the touch panel 106. Sensing the voltage difference, this can avoid the misjudgment of the touch position caused by the influence of the noise voltage.

It should be noted that the touch unit T1 is not limited to the sensing capacitor Cs. That is, the touch panel 106 is not limited to a capacitive touch panel, and may be other types of touch panels, for example. Resistive touch panel.

FIG. 4 is a flow chart of a touch sensing method of a touch device according to an embodiment of the invention. Referring to FIG. 4 , the touch sensing method of the touch device 100 may include the following steps: first, driving a first touch unit during a first line scan (eg, during a line scan of the drive signal D1) (eg, Touch unit T (1, 1)) (step S402). Then, the first touch unit is detected by the sensing line (for example, the sensing line S1) to obtain a first original signal (for example, the original signal ST(1, 1)) during the first line scanning (step S404). The unit can be, for example, a sensing capacitor. Then, the second touch unit (for example, the touch unit T(2, 1)) is driven during a second line scan period (for example, during the line scan of the drive signal D2) (step S406), wherein the reference signal can be, for example, a certain line. The original signal output by the sensing module 102 during the scanning period, or the original signal output by the sensing module 102 during the previous previous or next line scanning period, or the original signal generated during the different line scanning period. Average or weighted average. Then, during the second line scan, the second touch unit is detected through the sensing line to obtain a second original signal (for example, the original signal ST(2, 1)) (step S408). Then, a reference signal is obtained according to the second original signal (step S410). Finally, the reference signal is subtracted from the first original signal to obtain a sensing signal of the first touch unit (step S412).

In summary, in this embodiment, the original signal obtained during different line scans is used to obtain a reference signal, and each original signal is respectively subtracted from the corresponding reference signal to remove the low frequency noise included in the original signal to obtain a corresponding signal. The sensing signal is such that only the high frequency noise voltage is left in the sensing signal and the sensing voltage difference caused by the finger touching the touch panel. The high-frequency noise voltage can be easily filtered by a low-pass filter or a DSP filter of the prior art, so that only the sensing voltage difference caused by the finger touching the touch panel remains in the sensing signal. In this way, the sensing result is prevented from being affected by the noise voltage, and the correctness of determining the touch position is improved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100, 300. . . Touch device

102. . . Sensing module

104. . . control unit

106. . . Touch panel

P1~Pn. . . Scanning line

S1~Sm. . . Sensing line

T(1,1)~T(n,m). . . Touch unit

ST(1,1)~ST(n,m). . . Original signal

Cs, C1. . . capacitance

A1~Am. . . Operational Amplifier

Vref. . . Reference voltage

D1~Dn. . . Drive signal

ΔV. . . Drive signal high and low voltage level difference

S402~S412. . . Touch sensing method steps of touch device

FIG. 1 is a schematic diagram of a touch device according to an embodiment of the invention.

FIG. 2 is a schematic diagram showing waveforms of driving signals of respective scanning lines according to an embodiment of the invention.

FIG. 3 is a schematic diagram of a touch device according to another embodiment of the present invention.

FIG. 4 is a flow chart of a touch sensing method of a touch device according to an embodiment of the invention.

S402~S410. . . Touch sensing method steps of touch device

Claims (21)

A touch device includes: a sensing line disposed on a touch panel; a first touch unit disposed on the touch panel and coupled to the sensing line, wherein during a first line scan The first touch unit is driven; a second touch unit is disposed on the touch panel and coupled to the sensing line, wherein the second touch unit is driven during a second line scan; The module is coupled to the sensing line, wherein the sensing module detects the first touch unit through the sensing line during the first line scanning to output a first original signal, and the sensing module is configured by the sensing module The second touch unit is configured to detect a second original signal through the sensing line; and a control unit is coupled to the sensing module to use the second original signal as a reference signal. And subtracting the reference signal from the first original signal to obtain a sensing signal of the first touch unit. The touch device of claim 1, wherein the first touch unit and the second touch unit are adjacent to each other. The touch device of claim 1, wherein the first line scan period and the second line scan period are temporally adjacent to each other. The touch device of claim 1, wherein the first touch unit comprises a first sensing capacitor, one end of the first sensing capacitor is coupled to a first scan line, and the other end is coupled The second sensing unit is coupled to a second scan line, and the other end is coupled to the sensing line. The second sensing unit is coupled to the second sensing line. The touch device of claim 1, wherein the sensing module comprises: a first capacitor; and an operational amplifier, the inverting input end of the operational amplifier is coupled to the first of the first capacitor The non-inverting input terminal of the operational amplifier is coupled to a reference voltage, and the output end of the operational amplifier is coupled to the second end of the first capacitor and the control unit. A touch device includes: a sensing line disposed on a touch panel; a first touch unit disposed on the touch panel and coupled to the sensing line, wherein during a first line scan The first touch unit is driven; a second touch unit is disposed on the touch panel and coupled to the sensing line, wherein the second touch unit is driven during a second line scan; The module is coupled to the sensing line, wherein the sensing module detects the first touch unit through the sensing line during the first line scanning to output a first original signal, and the sensing module is configured by the sensing module The second touch unit is configured to detect a second original signal through the sensing line; a third touch unit is disposed on the touch panel and coupled to the sensing line, the third The touch unit is driven during a third line scan, wherein the sensing module detects the third touch unit through the sensing line to output a third original signal during the third line scan; and a control unit coupled Connecting the sensing module, calculating the second original signal and the Average or weighted average of the original three signals to the reference signal as well as the first subtracting the original signal to obtain the first reference signal The sensing signal of the touch unit. The touch device of claim 6, wherein the first touch unit and the second touch unit are adjacent to each other. The touch device of claim 6, wherein the first line scan period and the second line scan period are adjacent to each other in time. A touch device includes: a sensing line disposed on a touch panel; a first touch unit disposed on the touch panel and coupled to the sensing line, wherein during a first line scan The first touch unit is driven; a second touch unit is disposed on the touch panel and coupled to the sensing line, wherein the second touch unit is driven during a second line scan; The module is coupled to the sensing line, wherein the sensing module detects the first touch unit through the sensing line during the first line scanning to output a first original signal, and the sensing module is configured by the sensing module The second touch unit is configured to detect the second touch unit to output a second original signal during the second line scan; the plurality of third touch units are disposed on the touch panel and coupled to the sensing line; The first touch unit, the second touch unit, and the third touch units are each driven during different line scans; the sensing module detects the plurality of lines during the different line scans through the sensing line The third touch unit outputs a plurality of third original signals; and one The unit is coupled to the sensing module, and calculates an average or weighted average of the second original signal and the third original signals as the reference signal, and subtracts the reference signal from the first original signal. To get the first A sensing signal of a touch unit. The touch device of claim 9, wherein the first touch unit and the second touch unit are adjacent to each other. The touch device of claim 9, wherein the first line scanning period and the second line scanning period are temporally adjacent to each other. A method for removing noise in a touch device, wherein the touch device includes a sensing line, a first touch unit, and a second touch unit, the noise canceling method includes: driving the first line scan period The first touch unit detects the first touch unit through the sensing line to obtain a first original signal during the first line scan; and drives the second touch unit during a second line scan; The second touch unit is detected by the sensing line to obtain a second original signal; the second original signal is used as a reference signal; and the first original signal is subtracted from the reference signal. Obtaining a sensing signal of the first touch unit. The noise cancellation method of the touch device of claim 12, wherein the first touch unit and the second touch unit are adjacent to each other. The method of removing noise of a touch device according to claim 12, wherein the first line scanning period and the second line scanning period are temporally adjacent to each other. The method for removing noise of a touch device according to claim 12, wherein the first touch unit includes a first sensing capacitor, and The second touch unit includes a second sensing capacitor. A method for removing noise in a touch device, wherein the touch device includes a sensing line, a first touch unit, a second touch unit, and a third touch unit, and the noise canceling method includes: The first touch unit is driven during the first line scan; the first touch unit is detected by the sensing line to obtain a first original signal during the first line scan; and the first line is driven during a second line scan The second touch unit detects the second touch unit through the sensing line to obtain a second original signal during the second line scan; and drives the third touch unit during a third line scan; Detecting the third touch unit through the sensing line to obtain a third original signal; calculating an average or weighted average of the second original signal and the third original signal; and weighting the average value or weighting The average value is used as a reference signal; and the first original signal is subtracted from the reference signal to obtain a sensing signal of the first touch unit. The noise cancellation method of the touch device of claim 16, wherein the first touch unit and the second touch unit are adjacent to each other. The noise cancellation method of the touch device of claim 16, wherein the first line scanning period and the second line scanning period are temporally adjacent to each other. A method for removing noise in a touch device, wherein the touch device includes a sensing line, a first touch unit, a second touch unit, and a plurality of third touch units, and the noise canceling method includes: Driving the first touch unit during a first line scan; detecting the first touch unit through the sensing line to obtain a first original signal during the first line scan; and driving the second line scan during the second line scan The second touch unit detects the second touch unit through the sensing line to obtain a second original signal during the second line scan; and drives the third touch units during different line scans; Detecting the third touch units through the sensing lines to output a plurality of third original signals during the different line scans; calculating an average or weighted average of the second original signals and the third original signals; The average value or the weighted average value is used as a reference signal; and the first original signal is subtracted from the reference signal to obtain a sensing signal of the first touch unit. The noise cancellation method of the touch device of claim 19, wherein the first touch unit and the second touch unit are adjacent to each other. The noise cancellation method of the touch device of claim 19, wherein the first line scanning period and the second line scanning period are adjacent to each other in time.