TWI439914B - Touch sensing apparatus - Google Patents

Description

Touch sensing device

The present invention relates to a liquid crystal display; in particular, the present invention relates to a mutual inductance capacitive touch sensing device by means of an additional capacitive load between a sensing pad and a ground. Improve the signal-to-noise ratio (SNR) of the entire system, and effectively avoid the reduction of the data transfer rate and the increase in power consumption of the entire system.

With the rapid development of technology, thin film transistor liquid crystal display (TFT LCD) has gradually replaced traditional displays, and has been widely used in various electronic products such as televisions, flat panel displays, mobile phones, tablet computers and projectors. For a thin film transistor liquid crystal display with touch function, the touch sensor is one of its important modules, and its performance directly affects the overall performance of the liquid crystal display.

As shown in FIG. 1 , a conventional liquid crystal display D having a mutual-capacitive capacitive touch function includes a touch panel PL, a conductive thin film sensor ITO, and a touch control wafer TC. The conductive film sensor ITO includes a plurality of sensing lines SL and a plurality of driving lines DL, and the driving multiplexer DM of the touch control chip TC transmits driving voltages to the driving lines through the driving pads DP ₀ to DP _m DL, and a small voltage is coupled to the sensing lines SL, the touch control chip TC can sense the coupling voltage through the sensing pads SP ₀ ~SP _n , and determine whether the conductive film sensor ITO is touched according to the magnitude of the coupling voltage control.

However, the above conventional touch sensing method still has some serious shortcomings. For example, it is quite susceptible to interference caused by noise generated by the external environment and parasitic capacitance effect of the touch panel. As shown in FIG. 2A, the driving voltages input through the driving pads DP ₀ to DP _m are both V _D ; as shown in FIG. 2B, the coupling voltage difference ΔVt measured corresponding to the touch point TP (DP1*SP1) It is significantly larger than the coupled voltage difference ΔVd measured corresponding to the remaining non-touch points (DP0*SP1, DP2*SP1, . . . , DPm*SP1). This will result in a reduction in signal-to-noise ratio and severely affect the operation of the touch control chip, and even lead to misjudgment of touch points.

Although some systems are provided with filters for anti-noise, they also result in reduced data transfer rate and increased power consumption for these systems. In view of this, the present invention provides a mutual inductance capacitive touch sensing device to solve the above problems.

One aspect of the present invention is to provide a touch sensing device. In one embodiment, the touch sensing device senses a touch point of a touch panel through a conductive film sensor, and the conductive film sensor includes a plurality of sensing lines and a plurality of driving lines, and the touch The control sensing device comprises at least a plurality of sensing pads, a plurality of pins, a logic control module, at least one driving/sensing control module, at least one processing module and at least one analog/digital conversion module.

A plurality of sensing pads respectively corresponding to and coupled to the plurality of sensing lines, wherein each of the sensing pads and the ground has an additional capacitive load. The plurality of first pins of the plurality of pins are respectively coupled to the plurality of sensing lines through the plurality of sensing pads for performing sensing functions on the plurality of sensing lines from the plurality of sensing lines A plurality of coupling capacitor values are sensed. The logic control module generates a plurality of control signals for different control timings, and the control signals include a driving/sensing control signal, a processing control signal, and a analog/digital conversion control signal. The at least one driving/sensing control module defines the plurality of first pins as driving pins or sensing pins according to the driving/sensing control signals. The at least one processing module converts the plurality of coupling capacitor values into a plurality of voltage values according to the processing control signal. The at least one analog/digital conversion module converts the plurality of voltage values into a plurality of digital data according to the analog/digital conversion control signal, and transmits the plurality of digital data to the logic control module.

In one embodiment, the touch sensing device further includes a plurality of driving pads respectively corresponding to and coupled to the plurality of driving lines.

In one embodiment, the plurality of second pins of the plurality of pins are respectively coupled to the plurality of driving lines through the plurality of driving pads, when the driving/sense control module is driven/sensed according to the driving/sensing The control signal defines that when the plurality of second pins are driving pins, the plurality of second pins perform a driving function, and a driving voltage is output to the plurality of driving lines through the plurality of driving pads.

In one embodiment, each of the driving lines and each of the sensing lines has a coupling capacitor CM, and each of the sensing lines and the ground has an equivalent capacitance CS, and each of the sensing pads and the ground has an additional capacitance. Load Cy, the variation of the coupling capacitance between each drive line and each sense line is ΔCM, the equivalent capacitance change between each sense line and the ground end is Ch, and a touch point falls on the complex number a first driving line Y1 of the strip driving line and a junction (X ₁ , Y ₁ ) intersecting one of the plurality of sensing lines, and a second sense of the plurality of sensing lines The line X2 is adjacent to the first sensing line X1.

In one embodiment, the driving voltage V _d is output to the second driving line Y2 of the plurality of driving lines, and the junction (X ₁ , Y ₂ ) of the second driving line Y2 intersects with the first sensing line X1. Voltage V _{x_x1y2} = V _d (CM/CS+Cy+Ch+n*CM- _ΔCM ), voltage V _{x_x2y2} of the junction (X ₂ , Y ₂ ) at which the second drive line Y2 intersects the second sensing line X2 = V _d (CM/CS+Cy+n*CM), where n is the number of complex sensing lines. The voltage V _{x_x2y2} and the voltage V _{x_x1y2} have a first voltage difference ΔV _s =V _d [CM( _Ch-ΔCM )]/[(CS+Cy+n*CM)(CS+Cy+Ch+n*CM -△CM)].

In one embodiment, the driving voltage V _d is output to the first driving line Y1, and the voltage of the junction (X ₁ , Y ₁ ) of the first driving line Y1 and the first sensing line X1 is V _{x_x1y1} = V _d [ (CM-ΔCM)/(CS+Cy+Ch+n*CM-ΔCM)], the voltage of the junction (X ₂ , Y ₁ ) at which the first driving line Y1 intersects the second sensing line X2 is V _{x_x2y1} = V _d (CM/CS+Cy+n*CM), where n is the number of complex sensing lines. _There is a second voltage difference ΔV _t =V _d between the voltage V _{x_x1y1} and the voltage V _{x_x2y1} [CM*Ch+ _ΔCM (CS+Cy+(n-1)*CM)]/[(CS+Cy+n*CM) (CS+Cy+Ch+n*CM-△CM)].

In one embodiment, the signal-to-noise ratio (SNR) of the touch sensing device that touches the touch panel through the conductive film sensor is a second voltage difference ΔV _t and The ratio of the first voltage difference ΔV _s , that is, the signal-to-noise ratio is [CM*Ch+ΔCM(CS+Cy+(n-1)*CM)]/[CM(Ch-ΔCM)]. As the additional capacitive load Cy between each of the sensing pads and the ground is increased, the signal-to-noise ratio is also increased.

Compared with the prior art, the touch sensing device according to the present invention utilizes an additional capacitive load between the sensing pad and the ground to improve the signal-to-noise ratio (SNR) of the entire system. Not only can the noise generated by the liquid crystal display panel and the external environment be effectively interfered with when the touch sensing device senses the touch point, nor does it cause the data transfer rate of the entire system to decrease and Power consumption increases. Therefore, the touch sensing device of the present invention can more accurately sense the touch point of the touch display panel to greatly reduce the probability of misjudgment.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

A touch sensing device according to an embodiment of the invention. In this embodiment, the touch sensing device may be a mutual-capacitive capacitive touch sensing device, but is not limited thereto. Please refer to FIG. 3. FIG. 3 is a functional block diagram of the touch sensing device of the present invention.

As shown in FIG. 3 , the touch sensing device 1 includes at least a logic control module 10 , a pin 20 , a driving/sensing control module 30 , a processing module 40 , a contact pad 50 , and an analogy . /Digital conversion module 60. The logic control module 10 is coupled to the driving/sensing control module 30, the processing module 40, and the analog/digital conversion module 60; the driving/sensing control module 30 is coupled to the pin 20 and the processing module 40. The pin 20 is coupled to the contact pad 50; the processing module 40 is coupled to the analog/digital conversion module 60.

Please refer to FIG. 4 , which is a schematic diagram of the touch sensing device 1 of the present invention sensing the touch point of the touch panel 70 through the conductive film sensor 100 . As shown in FIG. 4 , the touch panel 70 is generally attached to the conductive film sensor 100 , but is not limited thereto. The conductive film inductor 100 includes n sensing lines 80 and m driving lines 90 that are vertically distributed from each other. n and m are positive integers. It should be noted that the driving line 90 and the sensing line 80 are interchangeable, that is, the 90 in FIG. 4 can actually be used as the sensing line, and the 80 in FIG. 4 can actually be the driving line, and can be touched. The sensing device 1 controls the switching of its functions.

In addition, the sensing pads SP ₀ to SP _n and the driving pads DP ₀ to DP _m in FIG. 4 belong to the contact pads 50 in FIG. 3 . The sensing pads SP ₀ ~ SP _n are respectively corresponding to and coupled to the n sensing lines 80; the driving pads DP ₀ ~ DP _m are respectively corresponding to and coupled to the m driving lines 90. Each of the driving lines 90 and the grounding end respectively has a capacitance CD; each of the sensing lines 80 and the grounding end respectively has a capacitance CS; each of the driving lines 90 and each of the sensing lines 80 respectively have a coupling capacitance CM; An additional capacitive load Cy is provided between each of the sensing pads SP ₀ ~ SP _n and the ground.

The pin 20 is coupled to the sensing pads SP ₀ ~ SP _n , the driving pads DP ₀ ~ DP _m and the driving / sensing control module 30; the driving / sensing control module 30 is coupled to the logic control module 10 The processing module 40 is coupled to the logic control module 10, the driving/sensing control module 30, and the analog/digital conversion module 60; the analog/digital conversion module 60 is coupled to the logic control Module 10 and processing module 40.

In this embodiment, the logic control module 10 is configured to generate a plurality of control signals for different control timings, such as driving/sensing control signals, processing control signals, and analog/digital conversion control signals, and the logic control module 10 The driving/sensing control signal, the processing control signal, and the analog/digital conversion control signal are respectively output to the driving/sense control module 30, the processing module 40, and the analog/digital conversion module 60, but are not limited thereto.

In practical applications, the pins 20 not only have a single function, but can switch between different functions according to actual needs, such as a driving function, a sensing function, a ground function, or Floating function, but not limited to this. For example, the driving/sensing control module 30 can define the pin 20 as a driving pin for performing a driving function according to the driving control signal in the control signals, and the driving pin 20 is respectively output through the driving pads DP ₀ to DP _m . The driving voltage V _{D is} to the corresponding driving lines 90 on the conductive film inductor 100. In addition, the driving/sensing control module 30 can also define the sensing pin of the sensing function according to the sensing control signal in the control signals, and the sensing pin 20 respectively passes through the sensing pad SP _{0 .} ~SP _n senses the complex coupling capacitance value from the corresponding sensing line 80 on the conductive film sensor 100.

Then, the processing module 40 converts the complex coupling capacitance value into a plurality of voltage values according to the processing control signal. Since the voltage values are still analog signals, the analog/digital conversion module 60 converts the voltage values into digital data according to the analog/digital conversion control signal, and outputs the converted digital data to the logic control mode. Group 10.

Next, a signal-noise when the touch sensing device 1 touches the touch panel 70 through the conductive film sensor 100 will be described with a practical example (n=5 and m=5). The relationship between the Signal-Noise Ratio (SNR) and the additional capacitive load Cy.

Please refer to FIG. 5. FIG. 5 is a schematic diagram showing the equivalent capacitance of all the driving lines Y1~Y5 and the sensing lines X1~X5 when the driving voltage V _{D is} output to the driving line Y5 that does not correspond to the touch point TP. As shown in FIG. 5, each of the driving lines Y1~Y5 and each of the sensing lines X1~X5 respectively have a coupling capacitor CM, and each sensing line X1~X5 and the grounding end respectively have an equivalent capacitance CS, sensing There is an additional capacitive load Cy between pads SP ₃ , SP ₄ and ground. The touch point TP falls on the junction (X ₃ , Y ₃ ) where the driving line Y3 intersects the sensing line X3, and the sensing line X4 is adjacent to the sensing line X3. The equivalent capacitance change amount between the sensing line X3 corresponding to the touch point TP and the ground terminal is Ch. The touch point TP causes the coupling capacitance variation amount between the driving line Y3 and the sensing line X3 to be ΔCM, so that the coupling capacitance between the driving line Y3 corresponding to the touch point TP and the sensing line X3 is (CM-ΔCM). .

Since the driving voltage V _D in FIG. 5 is output to the driving line Y5, the voltage of the contact (X ₃ , Y ₅ ) at which the driving line Y5 intersects the sensing line X3 is V _{x_x3y5} = V _D (CM/CS+Cy+Ch) +5*CM- _ΔCM ), the voltage of the junction (X ₄ , Y ₅ ) at which the drive line Y5 intersects the sensing line X4 is V _{x_x4y5} = V _D (CM/CS+Cy+5*CM). Therefore, assuming that the first voltage difference between the voltage V _{x_x3y5} and the voltage V _{x_x4y5} is ΔV _s , then ΔV _s =V _{x_x4y5} -V _{x_x3y5} =V _D [CM(Ch-CM)]/[(CS+Cy+ 5*CM) (CS+Cy+Ch+5*CM-△CM)].

Referring to FIG. 6, FIG. 6 shows when the driving voltage V _d is outputted to the corresponding driving line Y3 of the touch point TP, Y1 ~ Y5 schematic equivalent capacitance of the sensing line X1 ~ X5 driving lines of all lines. 6, since the driving voltage V _d is the drive train output corresponding to the touch point TP the line Y3, Y3 lines and sense lines intersect the contact X3 is driven (X _3, Y ₃₎ of the voltage _V x_x3y3 = V _D [(CM-△CM)/(CS+Cy+Ch+5*CM-△CM)], the voltage of the junction (X ₄ , Y ₃ ) at which the drive line Y3 intersects the sensing line X4 V _{x_x4y3} = V _D (CM/CS+Cy+5*CM). Therefore, assuming that the second voltage difference between the voltage V _{x_x3y3} and the voltage V _{x_x4y3} is ΔV _t , then ΔV _t =V _{x_x4y3} -V _{x_x3y3} =V _D [CM*Ch+ _ΔCM (CS+Cy+4*CM )]/[(CS+Cy+5*CM)(CS+Cy+Ch+5*CM-△CM)].

In summary, the signal-to-noise ratio (SNR) of the touch sensing device 1 through the conductive film sensor 100 for touch point sensing is defined as the second The ratio of the voltage difference ΔV _t to the first voltage difference ΔV _s , that is, its signal-to-noise ratio = ΔV _t / ΔV _s = [CM * Ch + ΔCM (CS + Cy + 4 * CM)] / [CM(Ch-△CM)].

Therefore, when the additional capacitive load Cy connected in series between each of the sensing pads SP ₀ to SP _n and the ground is increased, the touch sensing device 1 touches the touch panel 70 through the conductive film sensor 100. The point-sensing signal-noise ratio will be improved. That is to say, the user can change the signal-to-noise ratio of the system by adjusting the size of the additional capacitive load Cy connected between the sensing pads SP ₀ ~ SP _n and the ground.

Compared with the prior art, the touch sensing device according to the present invention utilizes an additional capacitive load between the sensing pad and the ground to improve the signal-to-noise ratio of the entire system, which can effectively reduce the liquid crystal display. The noise generated by the panel and the external environment may not cause the data transmission return rate and the power consumption of the entire system to be reduced when the touch sensing device senses the touch point. Therefore, the touch sensing device of the present invention can more accurately sense the touch point of the touch display panel to greatly reduce the probability of misjudgment.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

D. . . LCD Monitor

PL. . . Touch panel

TC. . . Touch control chip

DM. . . Drive multiplexer

SM. . . Sensing multiplexer

SB. . . Sensing unit

ADC. . . Analog digital converter

DLC. . . Digital logic controller

DP ₀ ~DP _m . . . Drive pad

SP ₀ ~SP _n . . . Sensing pad

V _D . . . Driving voltage

TP (X ₃ , Y ₃ ). . . Touch point

△Vt, △Vd. . . Coupling voltage difference

1. . . Touch sensing device

10. . . Logic control module

20. . . Pin

30. . . Drive/sense control module

40. . . Processing module

ITO, 100. . . Conductive film sensor

70. . . Touch panel

50. . . Contact pad

60. . . Analog/digital conversion module

SL, 80. . . Sensing line

DL, 90. . . Drive line

V _out . . . The output voltage

Gnd. . . Ground voltage

Y1~Y5. . . Drive line

X1~X5. . . Sensing line

CM. . . Coupling capacitance between the drive line and the sense line

CS. . . Equivalent capacitance between the sense line and the ground

CD. . . Capacitance between the drive line and the ground

Cy. . . Additional capacitive load between the sense pad and ground

A(X ₃ , Y ₅ ), B(X ₄ , Y ₅ ), C(X ₄ , Y ₃ ). . . contact

△CM. . . The touch point causes a change in the coupling capacitance between the corresponding drive line and the sense line

FIG. 1 is a schematic diagram showing a touch point sensing of a conductive film sensor by a touch sensing device of a conventional liquid crystal display.

2A and 2B respectively show the driving voltage input by the driving pad and the coupling voltage difference measured by the sensing pad.

3 is a functional block diagram of a touch sensing device of the present invention.

FIG. 4 is a schematic diagram showing the touch sensing of the display panel by the touch sensing device of the present invention through the conductive film sensor.

FIG. 5 is a schematic diagram showing the equivalent capacitance of all driving lines and sensing lines when the driving voltage is output to a driving line that does not correspond to a touch point.

FIG. 6 is a schematic diagram showing the equivalent capacitance of all driving lines and sensing lines when the driving voltage is output to the driving line corresponding to the touch point.

1. . . Touch sensing device

10. . . Logic control module

20. . . Pin

30. . . Drive/sense control module

40. . . Processing module

50. . . Contact pad

60. . . Analog/digital conversion module

Claims (8)

A touch sensing device performs touch point sensing on a touch panel through a conductive film sensor, the conductive film sensor includes a plurality of sensing lines and a plurality of driving lines, and the touch sensing device is at least The method includes: a plurality of sensing pads respectively corresponding to and coupled to the plurality of sensing lines, wherein each of the sensing pads and the ground has an additional capacitive load; a plurality of driving pads, Correspondingly coupled to the plurality of driving lines; a plurality of pins, wherein the plurality of first pins are coupled to the plurality of sensing lines through the plurality of sensing pads respectively Performing a sensing function on the plurality of sensing lines to sense a plurality of coupling capacitance values from the plurality of sensing lines; and a logic control module for generating a plurality of control signals of different control timings, the control The signal includes a driving/sensing control signal, a processing control signal, and a analog/digital conversion control signal. The at least one driving/sensing control module is coupled to the logic control module and the plurality of pins for According to the The driving/sensing control signal defines that the plurality of first pins are driving pins or sensing pins; at least one processing module is coupled to the logic control module and the driving/sense control module for Converting the plurality of coupling capacitor values into a plurality of voltage values according to the processing control signal; and at least one analog/digital conversion module coupled between the logic control module and the processing module for using the analogy And the digital conversion control signal converts the plurality of voltage values into a plurality of digital data, and transmits the plurality of digital data to the logic control module; wherein the plurality of second pins of the plurality of pins respectively transmit the plurality of pins The plurality of driving pads are coupled to the plurality of driving lines. When the driving/sense control module defines the plurality of second pins as driving pins according to the driving/sense control signal, the plurality of second connections The pin performs a driving function, and outputs a driving voltage to the plurality of driving lines through the plurality of driving pads, and each of the driving lines and each of the sensing lines respectively has a coupling capacitor CM, and each sensing line and the grounding end respectively An equivalent capacitor CS is provided, and each of the sensing pads and the grounding end respectively has the additional capacitive load Cy, and a touch point falls on one of the plurality of driving lines, the first driving line Y1 and the plurality of sensing lines One of the first sensing lines X1 intersects the contact point (X ₁ , Y ₁ ), and one of the plurality of sensing lines is adjacent to the first sensing line X1, the first sense The equivalent capacitance change between the line X1 and the ground is Ch, and the touch point causes the coupling capacitance variation between the first driving line Y1 and the first sensing line X1 to be ΔCM, so that the first driving The coupling capacitance between the line Y1 and the first sensing line X1 is (CM-ΔCM), and the driving voltage V _d is output to one of the plurality of driving lines, and the second driving line is The voltage of the junction (X ₁ , Y ₂ ) at which Y2 intersects the first sensing line X1 is V _{x_x1y2} = V _d (CM/CS+Cy+Ch+n*CM- _ΔCM ), and the second driving line Y2 is The voltage of the junction (X ₂ , Y ₂ ) at which the second sensing line X2 intersects is V x — x _{2 y2} = V _d (CM/CS+Cy+n*CM), where n is the number of the plurality of sensing lines. The touch sensing device of claim 1, wherein the voltage V _{x_x2y2} and the voltage V _{x_x1y2} have a first voltage difference ΔV _s =V _d [CM( _Ch-ΔCM )]/[( CS+Cy+n*CM)(CS+Cy+Ch+n*CM-△CM)]. The touch sensing device of claim 2, wherein the driving voltage V _d is output to the first driving line Y1, and the first driving line Y1 meets the first sensing line X1 (X ₁ , Y ₁ ) voltage V _{x_x1y1} = V _d [(CM - _ΔCM ) / (CS + Cy + Ch + n * CM - _ΔCM )], the first driving line Y1 and the second sensing line The voltage at which the junction of X2 intersects (X ₂ , Y ₁ ) is V x — x _{2 y1} = V _d (CM/CS + Cy + n * CM), where n is the number of the plurality of sensing lines. The touch sensing device of claim 3, wherein the voltage V _{x_x1y1} and the voltage V _{x_x2y1} have a second voltage difference ΔV _t =V _d [CM*Ch+ _ΔCM (CS+Cy+(n -1) *CM)]/[(CS+Cy+n*CM)(CS+Cy+Ch+n*CM-△CM)]. The touch sensing device of claim 4, wherein the touch sensing device performs a touch point sensing signal-to-noise ratio on the touch panel through the conductive film sensor (Signal- The noise ratio (SNR) is the ratio of the second voltage difference ΔV _t to the first voltage difference ΔV _s , that is, the signal-to-noise ratio is [CM*Ch+ΔCM(CS+Cy+(n-1) ) *CM)]/[CM(Ch-△CM)]. The touch sensing device of claim 5, wherein the signal-to-noise ratio is increased when the additional capacitive load Cy connected in series between each of the sensing pads and the ground is increased. Get promoted. A touch sensing device performs touch point sensing on a touch panel through a conductive film sensor, the conductive film sensor includes a plurality of sensing lines and a plurality of driving lines, and the touch sensing device is at least The method includes: a plurality of sensing pads respectively corresponding to and coupled to the plurality of sensing lines, wherein each of the sensing pads and the ground has an additional capacitive load; a plurality of driving pads, Correspondingly coupled to the plurality of driving lines; a plurality of pins, wherein the plurality of first pins are coupled to the plurality of sensing lines through the plurality of sensing pads respectively Performing a sensing function on the plurality of sensing lines to sense a plurality of coupling capacitance values from the plurality of sensing lines; and a logic control module for generating a plurality of control signals of different control timings, the control The signal includes a driving/sensing control signal, a processing control signal, and a analog/digital conversion control signal. The at least one driving/sensing control module is coupled to the logic control module and the plurality of pins for according to The driving/sensing control signal defines that the plurality of first pins are driving pins or sensing pins; at least one processing module is coupled to the logic control module and the driving/sense control module for Converting the plurality of coupling capacitor values into a plurality of voltage values according to the processing control signal; and at least one analog/digital conversion module coupled between the logic control module and the processing module for using the analogy And the digital conversion control signal converts the plurality of voltage values into a plurality of digital data, and transmits the plurality of digital data to the logic control module; wherein the plurality of second pins of the plurality of pins respectively pass through the The plurality of driving pads are coupled to the plurality of driving lines. When the driving/sense control module defines the plurality of second pins as driving pins according to the driving/sense control signal, the plurality of second connections The pin performs a driving function, and outputs a driving voltage to the plurality of driving lines through the plurality of driving pads, and each of the driving lines and each of the sensing lines respectively has a coupling capacitor CM, and each sensing line and the grounding end respectively An equivalent capacitor CS is provided, and each of the sensing pads and the grounding end respectively has the additional capacitive load Cy, and a touch point falls on one of the plurality of driving lines, the first driving line Y1 and the plurality of sensing lines One of the first sensing lines X1 intersects the contact point (X ₁ , Y ₁ ), and one of the plurality of sensing lines is adjacent to the first sensing line X1, the first sense The equivalent capacitance change between the line X1 and the ground is Ch, and the touch point causes the coupling capacitance variation between the first driving line Y1 and the first sensing line X1 to be ΔCM, so that the first driving The coupling capacitance between the line Y1 and the first sensing line X1 is (CM-ΔCM), and the driving voltage V _d is output to the first driving line Y1, then the first driving line Y1 and the first sensing line The voltage of the junction (X ₁ , Y ₁ ) at which X1 intersects is V _{x_x1y1} = V _d [(CM - _ΔCM ) / (CS + Cy + Ch + n * CM - _ΔCM )], the first drive line Y1 and The voltage of the junction (X ₂ , Y ₁ ) at which the second sensing line X2 intersects is V x — x _{2 y1} = V _d (CM/CS+Cy+n*CM), where n is the number of the plurality of sensing lines. The touch sensing device of claim 7, wherein the voltage V _{x_x1y1} and the voltage V _{x_x2y1} have a second voltage difference ΔV _t =V _d [CM*Ch+ _ΔCM (CS+Cy+(n -1) *CM)]/[(CS+Cy+n*CM)(CS+Cy+Ch+n*CM-△CM)].