TWI585660B - Touch sensing apparatus - Google Patents

Description

Touch sensing device

The present disclosure relates to an inductive device, and more particularly to a touch sensing device.

In today's high-tech technology, more and more electronic product operation interfaces have begun to use touch panels, making the demand for touch sensing devices growing. The touch sensing device has almost become the basis of any push-button interface, and the touch sensing interface replaces the traditional button interface, which undoubtedly makes the interface more intuitive and easier to use.

In addition, those skilled in the art can replace the mechanical buttons required for various applications by touching the sensing control interface, such as access control, mobile phones, MP3 players, PC peripherals and remote controls, etc., thereby saving The cost of producing the product.

However, in a capacitive touch sensing device, for example, it is often necessary to provide a plurality of capacitors for performing a touch sensing operation, and the circuit layout area occupied by these capacitors is relatively large, not only making the touch sensing device The size cannot be effectively reduced, and the manufacturing cost of the touch sensing device is kept high.

In addition, in a general touch sensing device, once the circuit layout of the capacitor is determined, the sensing sensitivity of the touch sensing device itself is fixed and cannot be changed, so that the touch is performed by the touch sensing device. The touch sensing operation cannot be flexibly adjusted according to the actual situation or the user's condition.

In summary, the general touch sensing device has a problem in that the circuit layout area occupied by the capacitor is quite large, and has a problem that it cannot be elastically adjusted according to actual needs.

The present disclosure provides a touch sensing device whereby the circuit layout of the touch sensing device is improved.

One aspect of the present disclosure relates to a touch sensing device including a touch sensing line, a comparator, and a variable capacitor unit. The touch sensing circuit performs an sensing operation according to at least one first driving signal in an inductive state. The comparator includes a first comparator input and a second comparator input, and the first comparator input and the second comparator input are electrically coupled to the contact sensing circuit for receiving the sensing signal output by the touch sensing circuit . The variable capacitor unit is selectively coupled to the first comparator input or the second comparator input for receiving the first comparator input or the second comparator input according to the at least one second driving signal. The sensing signal is used for potential compensation.

Another aspect of the present disclosure is directed to a touch sensing device including a touch sensing line, a comparator, and a variable capacitor unit. The touch sensing circuit performs an sensing operation according to at least one first driving signal in an inductive state. The comparator includes a first comparator input and a second comparator input. The first comparator input is electrically coupled to the contact sensing circuit for receiving the sensing signal output by the touch sensing circuit, and the second comparator input Electrically coupled to a reference voltage source. The variable capacitor unit is coupled to the first comparator input for performing potential compensation on the sensing signal received by the first comparator input according to the at least one second driving signal.

This summary is intended to provide a simplified summary of the disclosure This Summary is not an extensive overview of the disclosure, and is intended to be illustrative of the embodiments of the invention.

The embodiments are described in detail below with reference to the accompanying drawings, but the embodiments are not intended to limit the scope of the invention, and the description of the structure operation is not intended to limit the order of execution, any component recombination The structure, which produces equal devices, is within the scope of the present invention. In addition, the drawings are for illustrative purposes only and are not drawn to the original dimensions.

As used herein, "about", "about" or "substantially" generally means that the error or range of the index value is within 20%, preferably within 10%, and more preferably It is within 5 percent. In the text, unless otherwise stated, the numerical values referred to are regarded as approximations, such as an error or range indicated by "about", "about" or "substantial", or other approximations.

In addition, as used herein, "coupled" or "connected" may mean that two or more elements are in direct physical or electrical contact with each other, or indirectly in physical or electrical contact with each other, and "coupled" It can also mean that two or more elements operate or act on each other.

FIG. 1 is a schematic diagram of a touch sensing device according to a first embodiment of the present invention. As shown in FIG. 1 , the touch sensing device 100 includes a touch sensing circuit 110 , a comparator 120 , and a variable capacitor unit 130 . In the sensing state, the touch sensing circuit 110 performs sensing operation according to at least one first driving signal (eg, driving signal L+), so that the touch sensing circuit 110 outputs and touches events (eg, the touch sensing line 110 passes the finger, The stylus...etc. touches the corresponding sensing signal. The comparator 120 includes a first comparator input 122, a second comparator input 124, and a comparator output 126, wherein the first comparator input 122 and the second comparator input 124 are permeable to path S and path R, respectively. The electrically coupled contact sensing circuit 110 is configured to receive the sensing signal output by the touch sensing line 110. The variable capacitor unit 130 is selectively coupled to the first ratio through the path S The comparator input 122 is coupled to the second comparator input 124 for the first comparator input 122 or the second comparison according to the at least one second driving signal (eg, the driving signal VL+). The sensing signal received at the input 124 of the device is subjected to potential compensation. In an embodiment, the first driving signal and the second driving signal may be the same signal or different signals. In another embodiment, the level of the second drive signal may be a multiple of the level of the first drive signal (eg, 4 or 1/4 times).

Specifically, the path S and the path R each have a corresponding potential. When the driving signal L+ or L− is applied to the touch sensing line 110, when the touch sensing line 110 passes through an object (eg, a finger, a stylus) When touched, the touch sensing line 110 outputs a corresponding sensing signal through the path S or the path R, where the sensing signal can represent the voltage or potential change of the path S and the path R, respectively.

In detail, there is a capacitor (generally referred to as "compatibility") between the touch sensing line 110 and the path S and the path R, and another capacitor exists between the path S, the path R and the ground. (generally referred to as "self-capacity"), because the capacitance between the touch sensing line 110 and the path S or the path R changes when the touch sensing line 110 is touched by an object, so that the path S or path The potential of R is changed correspondingly. At this time, the variable capacitor unit 130 can be selectively coupled to the first comparator input terminal 122 through the path S, or coupled to the second comparator input terminal 124 through the path R, thereby driving according to the driving. The signal VL+ or VL- correspondingly compensates the potential of the path S (eg, the first comparator input 122) or the path R (eg, the second comparator input 124) such that the potential of the path S and the path R is Balance each other to obtain the potential or capacitance change corresponding to the touch sensing operation for subsequent processing of the data.

For example, in the case where the driving signal L+ (eg, a pulse signal having a voltage of 5 V) is applied to the touch sensing line 110, when the touch sensing line 110 is touched by an object, The touch sensing line 110 outputs a corresponding sensing signal through the path S, that is, the potential of the path S changes. At this time, the variable capacitor unit 130 is coupled to the second comparator input terminal 124 through the path R, and correspondingly compensates the potential of the path R according to the driving signal VL+, so that the potentials of the path S and the path R are balanced with each other to obtain Touching the potential or capacitance change of the path S corresponding to the sensing operation for subsequent processing of the data.

At this time, the sensing signal is transmitted on the path S and the path R according to the corresponding touch event, and there is a capacitive (or electrostatic) difference or unbalance between the two, and the variable capacitor unit 130 selectively pairs The sensing signal on the path S or the path R is subjected to potential compensation, so that the difference or the unbalanced portion can be quantified, and thereby the touch position on the touch sensing line 110 corresponding to the output sensing signal can be known. In addition, the comparator 120 processes the received sensing signal to output a differential signal for subsequent conversion to a corresponding digital data signal, and then the other components in the touch sensing device 100 perform related operations, and the user The result of the touch operation on the touch sensing line 110 can be obtained.

Next, as shown in FIG. 1 , the touch sensing device 100 further includes a controller 140 , and the controller 140 is electrically coupled to the comparator output 126 of the comparator 120 for output according to the comparator 120 . The signal correspondingly outputs the digital data signal, and generates a control signal to the variable capacitor unit 130 according to the output of the comparator 120 to adjust the equivalent capacitance of the variable capacitor unit 130 to further depend on the second driving signal (eg, driving). Signal VL+) correspondingly compensates for the induced signal received by first comparator input 122 or second comparator input 124.

In addition, the controller 140 can determine whether the touch sensing line 110 is touched according to the foregoing potential compensation amount, thereby obtaining the touch position on the touch sensing line 110.

Furthermore, the touch sensing device 100 further includes a substrate 108, wherein the substrate 108 is packaged Including a Thin Film Transistor Liquid Crystal Panel, an Organic Light-Emitting Diode Panel (OLED Panel), an Electronic Paper Panel, and a Micro Electro Mechanical Panel (MEMS Panel), a glass substrate or a transparent substrate. When the touch sensing circuit 110 of the present invention is disposed on a glass substrate, the touch sensing device 100 is a touch panel. The touch sensing circuit 110 can also be attached to the thin film transistor liquid crystal panel, the organic light emitting diode panel, the electronic paper panel or a microelectromechanical panel. An integrated (or monolithic) touch panel. In addition, the touch sensing line 110 can also be integrated into the display cell (Cell) layer of the thin film transistor liquid crystal panel or the organic light emitting diode panel.

In addition, the touch sensing line 110 can include a plurality of first electrodes 112 and a plurality of second electrodes 114, and the first electrodes 112 and the second electrodes 114 are alternately arranged. In one embodiment, the first electrode 112 and the second electrode 114 are arranged perpendicular to each other and are staggered, and the first electrode 112 is an electrode in the Y-axis direction, and the second electrode 114 is an electrode in the X-axis direction. In one embodiment, the first electrode 112 and the second electrode 114 are alternately arranged to form a sensing array, and at least one of the first electrodes 112 is driven (eg, driven by the driving signal L+) and the second electrode At least one of the 114s is coupled to form a sensing capacitor, and the sensing array generates a corresponding sensing signal according to the change of the sensing capacitance. It should be noted that the so-called first electrode 112 is driven by a driving signal, and does not fixedly drive a specific electrode, but dynamically drives the first electrode 112 by a driving signal, for example, from left to right.

In another embodiment, the first electrode 112 may be an X-axis electrode, and the second electrode 114 may be an Y-axis electrode, and the aforementioned components other than the touch sensing line 110 may be correspondingly configured or adjusted. In still another embodiment, the first electrode 112 and the second electrode 114 may also be arranged in an interdigital manner in the same horizontal plane. In the next embodiment, The first electrode 112 and the second electrode 114 may not necessarily be perpendicular to each other.

In practice, the first electrode 112 can be a stimulating electrode and the second electrode 114 can be a sensing electrode. In one embodiment, the stimulating electrodes are located in opposite upper layers and the sensing electrodes are located in opposite lower layers, while in another embodiment, the stimulating electrodes are located in opposite lower layers and the sensing electrodes are located in opposite upper layers.

In summary, regarding the arrangement or arrangement of the first electrode 112 and the second electrode 114, any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present invention, that is, As long as the first electrode 112 and the second electrode 114 can be coupled to form a sensing capacitor, it is an implementation scope of the present invention.

2 is a schematic view of a variable capacitor unit as shown in FIG. 1 according to an embodiment of the invention. As shown in FIGS. 1 and 2, the variable capacitor unit 130 includes a plurality of switchable capacitors (eg, switchable capacitors SC1, SC2, SC3, SC4), and switchable capacitors SC1, SC2, SC3, The SC4s are coupled in parallel with each other, wherein one ends of the switchable capacitors SC1, SC2, SC3, and SC4 are used to collectively receive a second driving signal (eg, a driving signal VL+), and the other of the switchable capacitors SC1, SC2, SC3, and SC4 One end is coupled to the first comparator input 122 through the path S according to the received second driving signal, or coupled to the second comparator input 124 via the path R.

In an embodiment, when the controller 140 outputs a control signal to the variable capacitor unit 130, the switches K1, K2, K3, and K4 corresponding to the switchable capacitors SC1, SC2, SC3, and SC4 are respectively switched to be turned on according to the control signals. Or the off state, so that the switchable capacitors SC1, SC2, SC3, SC4 are each turned on or off, thereby allowing the equivalent capacitance of the variable capacitor unit 130 to be adjusted accordingly according to the control signal.

In this way, in the touch sensing device 100, a relatively sensitive touch sensing operation can be achieved with a limited capacitor to save the capacitor setting, thereby reducing the capacitor occupation. The layout area of the circuit enables the size of the touch sensing device 100 to be effectively reduced, and the manufacturing cost is effectively reduced.

On the other hand, as shown in FIG. 1 and FIG. 2, the touch sensing line 110 can perform a touch sensing operation according to a plurality of first driving signals (eg, driving signals L+ and L-), and the variable capacitor unit 130 The first comparator input 122 or the second comparator input 124 can be selectively coupled to the first comparator input 122 or according to the second drive signal (eg, the drive signals VL+ and VL-) The induced signal received by the second comparator input 124 is subjected to potential compensation. The first driving signals L+ and L- and the second driving signals VL+ and VL- may be the same signal or different signals.

Accordingly, in the embodiment shown in FIG. 2, the switch K0 can be switched according to the control signal, and one end of the switchable capacitors SC1, SC2, SC3, SC4 can receive the second drive together by switching of the switch K0. One of the signals (ie, drive signal VL+ or VL-), and the other end of the switchable capacitors SC1, SC2, SC3, SC4 is in common transmission path according to the received second drive signal (drive signal VL+ or VL-) S is coupled to the first comparator input 122 or coupled to the second comparator input 124 via the path R. Similarly, the switches K1, K2, K3, and K4 corresponding to the switchable capacitors SC1, SC2, SC3, and SC4 can be switched to the on or off state according to the control signals, so that the switchable capacitors SC1, SC2, SC3, and SC4 are respectively Turning on or off, thereby allowing the equivalent capacitance of the variable capacitor unit 130 to be adjusted accordingly according to the control signal.

Secondly, in a case where the first driving signals L+, L- are different from the second driving signals VL+, VL-, the levels of the second driving signals VL+, VL- may be the levels of the first driving signals L+, L-. A multiple, where the multiple can be an integer (eg, 4 times), a fraction (eg, 1/4 times), or an arbitrary number. For example, in the case where the maximum equivalent capacitance of the variable capacitor unit 130 is already fixed, when the signals on the path S and the path R are induced to each other When the capacitive difference or the imbalance portion is too large, the level of the second driving signal VL+, VL- can be adjusted to 4 times the level of the first driving signal L+, L- by the programmable element or the amplifying element, so that The variable capacitor unit 130 can be received by the first comparator input 122 (path S) or the second comparator input 124 (path R) according to the second drive signal VL+ or VL- having the amplification level. The sensing signal is subjected to potential compensation, or by increasing the value of the driving signal VL+ or VL- to reduce the capacitance required for the variable capacitor unit 130 (taking Q=CV as an example, when the charge or potential is constant, when the voltage is increased) When the capacitance is reduced accordingly).

In this way, in the touch sensing device 100, the sensing sensitivity of the touch sensing device 100 itself can be adjusted by the change of the driving signal VL+ or VL- in the case where the configuration of the maximum equivalent capacitance is already fixed. The touch sensing operation performed by the entire touch sensing device 100 can be flexibly adjusted according to external actual conditions or user conditions.

In addition, in the embodiment shown in FIG. 1 , the touch sensing device 100 further includes switches SW1 and SW2 , wherein the first driving signals L+ and L− can selectively drive the first electrode 112 through the switch SW1, respectively. The two drive signals VL+ and VL- are selectively input to the variable capacitor unit 130 through the switch SW2, respectively. Secondly, the touch sensing device 100 can also include switches SW3, SW4, SW5 and SW6, wherein the variable capacitor unit 130 can be electrically connected to the first comparator input 122 and the second comparator input 124 via switches SW3 and SW4, respectively. The first comparator input 122 and the second comparator input 124 are electrically coupled through the switches SW5 and SW6, respectively. In operation, in a start state (eg, the touch sensing device 100 does not perform a touch sensing operation), the first comparator input 122 and the second comparator input 124 can be switched by the switches SW5 and SW6. An initial voltage V0 is coupled to the sensing state (eg, the touch sensing device 100 performs touch sensing) Operation), the variable capacitor unit 130 can be selectively coupled to the first comparator input 122 or the second comparator input 124 by switching of the switches SW3 and SW4.

It should be noted that the components other than the touch sensing circuit 110 can be integrated into a signal processing circuit (such as an analog digital conversion circuit), and the driving signals can be pulse signals, voltage signals, etc. Different types of operation signals, which can be dynamically adjusted by a microcontroller (MCU), and whose level can also be adjusted by programmable elements or amplifying elements, not limited to the foregoing. .

FIG. 3 is a schematic diagram of a touch sensing device according to a second embodiment of the present invention. As shown in FIG. 3 , the touch sensing device 300 includes a touch sensing circuit 310 , a comparator 320 , and a variable capacitor unit 330 . In the sensing state, the touch sensing circuit 310 performs sensing operation according to at least one first driving signal (eg, driving signal L+), so that the touch sensing circuit 310 outputs and touches events (eg, the touch sensing circuit 310 passes the finger, The stylus...etc. touches the corresponding sensing signal. The comparator 320 includes a first comparator input 322, a second comparator input 324, and a comparator output 326. The first comparator input 322 is electrically coupled to the sensing line 310 through the path S for receiving the touch. The second comparator input 324 is electrically coupled to a reference voltage source Vref, wherein the voltage level of the reference voltage source Vref can be between a power supply voltage level and a ground voltage. Between the levels. The variable capacitor unit 330 is coupled to the first comparator input 322 via the path S for receiving the first comparator input 322 according to the at least one second driving signal (eg, the driving signal VL+ or VL-). The sensing signal is used for potential compensation.

For example, in the case where the driving signals L+ and L- are simultaneously applied to the touch sensing line 310, if the position of the touch sensing is relatively biased toward the electrode of the receiving signal L+, the variable capacitor unit 330 is coupled through the path S. a comparator input 322, and according to, for example, a drive The motion signal VL- accordingly compensates for the induced signal received by the first comparator input 322.

In an embodiment, the first driving signal and the second driving signal may be the same signal or different signals. In another embodiment, the level of the second drive signal may be a multiple of the level of the first drive signal (eg, 4 or 1/4 times). The foregoing potential compensation operation is similar to the embodiment shown in FIG. 1, and therefore will not be described herein.

As shown in FIG. 3, the touch sensing device 300 further includes a controller 340, and the controller 340 is electrically coupled to the comparator output 326 of the comparator 320 for outputting a digital data signal according to the comparison. The output of the device 320 generates a control signal to the variable capacitor unit 330 to adjust the equivalent capacitance of the variable capacitor unit 330 to further input the first comparator according to the second driving signal (eg, the driving signal VL+). The sensing signal received at terminal 322 is subjected to potential compensation.

In addition, the touch sensing device 300 further includes a substrate 308, wherein the substrate 308 includes a Thin Film Transistor Liquid Crystal Panel and an Organic Light-Emitting Diode Panel (OLED). Panel), an electronic paper panel, a MEMS panel, a glass substrate or a transparent substrate. When the touch sensing circuit 310 of the present invention is disposed on a glass substrate, the touch sensing device 300 is a touch panel. The touch sensing circuit 310 can also be attached to the thin film transistor liquid crystal panel, the organic light emitting diode panel, the electronic paper panel or a microelectromechanical panel. An integrated (or monolithic) touch panel. In addition, the touch sensing line 310 can also be integrated into the display cell (Cell) layer of the thin film transistor liquid crystal panel or the organic light emitting diode panel.

In addition, the touch sensing circuit 310 can include a plurality of first electrodes 312 and a plurality of The second electrode 314 is disposed, and the first electrode 312 and the second electrode 314 are alternately arranged. In this embodiment, the configuration and operation of the first electrode 312 and the second electrode 314 are similar to those of the embodiment shown in FIG. 1 , and thus are not described herein again.

Secondly, the variable capacitor unit 330 can also include a plurality of switchable capacitors (eg, switchable capacitors SC1, SC2, SC3, SC4) as shown in FIG. 2, and the switchable capacitors are coupled in parallel with each other, wherein One end of the switched capacitor is used to receive the second driving signal (eg, the driving signal VL+), and the other end of the switchable capacitor is coupled to the first comparator input 322 through the path S according to the received second driving signal. The operation of the switchable capacitor in the variable capacitor unit 330 is similar to the embodiment shown in FIG. 2, and therefore will not be described herein.

In this way, in the touch sensing device 100, a relatively sensitive touch sensing operation can be achieved with a limited capacitor to save the capacitor setting, thereby reducing the circuit layout area occupied by the capacitor, so that the touch sensing device The size of 100 is effectively reduced, and the manufacturing cost is effectively reduced.

On the other hand, as shown in FIG. 3, the touch sensing circuit 310 can perform touch sensing operation according to a plurality of first driving signals (eg, driving signals L+ and L-), and the variable capacitor unit 330 can be based on several The second driving signals (such as the driving signals VL+ and VL-) are coupled to the first comparator input 322, wherein the first driving signals L+ and L- and the foregoing second driving signals VL+ and VL- may be the same signal or It is a different signal.

Similarly, in a case where the first driving signals L+, L- are different from the second driving signals VL+, VL-, the levels of the second driving signals VL+, VL- may be the levels of the first driving signals L+, L-. a multiple of which may be an integer (eg, 1, 2, 3, 4, . . . times), a score (eg, 1/2, 1/3, 1/4, . . . times) or Any number. For example, in the case where the maximum equivalent capacitance of the variable capacitor unit 330 is already fixed, when the path S and When the capacitive difference or imbalance between the induced signals on the path R is too large, the levels of the second driving signals VL+, VL- may be adjusted to the first driving signals L+, L- by a programmable element or an amplifying element. 4 times of the level, the variable capacitor unit 330 can accordingly perform a potential on the sensing signal received by the first comparator input 322 (path S) according to the second driving signal VL+ or VL- having the amplification level. make up.

In this way, in the touch sensing device 300, the sensing sensitivity of the touch sensing device 300 itself can be adjusted by the change of the driving signal VL+ or VL- in the case where the configuration of the maximum equivalent capacitance is already fixed. The touch sensing operation performed by the entire touch sensing device 300 can be flexibly adjusted according to external actual conditions or user conditions.

In addition, in the embodiment shown in FIG. 3, the touch sensing device 300 further includes switches SW1, SW2, SW3, and SW4, wherein the first driving signals L+ and L- are selectively driven by the switch SW1, respectively. The electrode 312, the second drive signals VL+ and VL- can be selectively input to the variable capacitor unit 330 through the switch SW2, respectively. The switch SW3 is coupled between the first comparator input 322 and the touch sensing circuit 310. The switch SW4 is coupled between the first comparator input 322 and the second comparator input 324. In operation, in a start state (eg, the touch sensing device 300 does not perform a touch sensing operation), the switch SW4 turns on the first comparator input terminal 322 and the second comparator input terminal 324, and the switch SW3 is turned off. In an inductive state (eg, the touch sensing device 300 performs a touch sensing operation), the switch SW4 is turned off, and the switch SW3 turns on the first comparator input terminal 322 and the touch sensing line 310.

Similarly, the components other than the touch sensing line 110 can be integrated into a signal processing circuit (such as an analog digital conversion circuit), and the driving signals can be different types such as a pulse signal, a voltage signal, and the like. Operation signal and can be controlled by a microcontroller (MCU) is dynamically adjusted, and its level can also be adjusted by a programmable element or an amplifying element, which is not limited to the foregoing.

Compared with the prior art, the embodiment of the present invention can achieve a relatively sensitive touch sensing operation with a limited capacitor to save the capacitor setting, thereby reducing the circuit layout area occupied by the capacitor. Therefore, the size of the touch sensing device can be effectively reduced, and the manufacturing cost can be effectively reduced, and the touch sensing device itself can be further adjusted by the change of the driving signal even when the configuration of the maximum equivalent capacitance is fixed. The sensing sensitivity enables the touch sensing operation performed by the entire touch sensing device to be flexibly adjusted according to external actual conditions or user conditions.

The present invention has been disclosed in the above embodiments, but it is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100, 300‧‧‧ touch sensing device

108, 308‧‧‧ substrate

110, 310‧‧‧ touch sensing lines

112, 312‧‧‧ first electrode

114, 314‧‧‧ second electrode

120, 320‧‧‧ comparator

122, 322‧‧‧ first comparator input

124, 324‧‧‧ second comparator input

126, 326‧‧‧ Comparator output

130, 330‧‧‧variable capacitor unit

140, 340‧‧ ‧ controller

SC1~SC4‧‧‧Switchable capacitor

FIG. 1 is a schematic diagram of a touch sensing device according to a first embodiment of the present invention.

2 is a schematic view of a variable capacitor unit as shown in FIG. 1 according to an embodiment of the invention.

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

100‧‧‧Touch sensing device

108‧‧‧Substrate

110‧‧‧Touch sensing circuit

112‧‧‧First electrode

114‧‧‧second electrode

120‧‧‧ comparator

122‧‧‧First comparator input

124‧‧‧Second comparator input

126‧‧‧ Comparator output

130‧‧‧Variable capacitor unit

140‧‧‧ Controller

Claims (14)

A touch sensing device includes: a touch sensing circuit, wherein the touch sensing circuit performs sensing operation according to at least one first driving signal in an inductive state; and a comparator, the comparator includes a first comparator input end And a second comparator input end, the first comparator input end and the second comparator input end are electrically coupled to the touch sensing line for receiving the sensing signal output by the touch sensing line; a variable capacitor unit for selectively receiving a second driving signal and a third driving signal, and selectively coupling the first comparator input or the second comparator input; wherein, when When the comparator input receives the sensing signal, the variable capacitor unit compensates the second comparator input according to one of the second driving signal and the third driving signal; wherein the variable capacitor The unit includes a switch for switching one of the second driving signal and the third driving signal to receive the other of the second driving signal and the third driving signal, wherein The third driving signal and the second driving signal is a positive potential at a negative potential, when the third driving signal to a second positive potential of the driving signal is a negative potential. The touch sensing device of claim 1, wherein the variable capacitor unit further comprises: a plurality of switchable capacitors coupled in parallel with each other, wherein one of the switchable capacitors is used Receiving the second driving letter by the switch And the third driving signal, the other end of the switchable capacitors being coupled to the first comparator input or the second comparator input. The touch sensing device of claim 1, further comprising: a controller for generating a control signal to the variable capacitor unit according to an output of the comparator to adjust an equivalent of the variable capacitor unit capacitance. The touch sensing device of claim 3, wherein the variable capacitor unit further comprises: a plurality of switchable capacitors coupled to the first comparator input or the second in parallel with each other At the comparator input, the switchable capacitors are each selectively turned on or off in accordance with the control signal. The touch sensing device of claim 1, wherein the first driving signal is the same as or different from the second driving signal. The touch sensing device of claim 1, further comprising: a controller, wherein the controller determines whether the touch sensing circuit is touched according to the potential compensation amount, thereby obtaining the touch sensing line Touch the location. The touch sensing device of claim 2, further comprising: a controller for generating a control signal according to the output of the comparator to control whether each of the switchable capacitors is turned on or off. A touch sensing device includes: a touch sensing circuit, wherein the touch sensing circuit performs sensing operation according to at least one first driving signal in an inductive state; and a comparator, the comparator includes a first comparator input end And a second comparator input, the first comparator input is electrically coupled to the touch sensing circuit for receiving the sensing signal output by the touch sensing circuit, and the second comparator input is electrically coupled And a variable capacitor unit coupled to the first comparator input for selectively receiving a second driving signal and a third driving signal, the variable capacitor The unit is configured to perform potential compensation on the sensing signal received by the input end of the first comparator according to one of the second driving signal and the third driving signal; wherein the variable capacitance unit comprises a switch, the switch And switching one of the second driving signal and the third driving signal to receive the other of the second driving signal and the third driving signal, wherein the second driving signal Different potential of the third drive signal. The touch sensing device of claim 8, wherein the variable capacitor unit further comprises: a plurality of switchable capacitors coupled in parallel with each other, wherein one of the switchable capacitors is used The other end of the switchable capacitors is coupled to the first comparator input terminal by the switch receiving the second drive signal and the third drive signal. The touch sensing device of claim 8, further comprising: a controller for generating a control signal to the variable capacitor unit according to an output of the comparator to adjust an equivalent of the variable capacitor unit capacitance. The touch sensing device of claim 10, wherein the variable capacitor unit further comprises: a plurality of switchable capacitors coupled to the first comparator input in parallel with each other, The switched capacitors are each selectively turned on or off in accordance with the control signal. The touch sensing device of claim 8, wherein in the sensing state, the touch sensing circuit performs a touch sensing operation according to the plurality of first driving signals, and the variable capacitor unit is configured according to the second driving signal One of the third driving signals correspondingly performs potential compensation on the sensing signal received by the first comparator input, and the first driving signals are the same as or different from one of the second driving signal and the third driving signal. The touch sensing device of claim 12, wherein the variable capacitor unit further comprises: a plurality of switchable capacitors coupled in parallel with each other, wherein one of the switchable capacitors is used Optionally receiving, by the switch, one of the second driving signal and the third driving signal, the other ends of the switchable capacitors are commonly coupled to the first comparator input. The touch sensing device of claim 12, wherein the second driving signal and the third driving signal are different from the first driving signals, and the second driving signal and the third driving signal are at a level a multiple of the level of the first drive signal.