Method for controlling touch sensor and touch sensing circuit thereof

Abstract

A method of controlling a touch sensor having a plurality of touch sensing electrodes and a touch sensing circuit thereof are disclosed, the method comprising the steps of: outputting an uplink signal to a first touch sensing electrode of the plurality of touch sensing electrodes; and outputting a reverse uplink signal to a second touch sensing electrode in the plurality of touch sensing electrodes. The uplink signal is switched in a first direction, and the reverse uplink signal is switched in a second direction opposite to the first direction.

Description

Technical Field

[0001] The present invention relates to a method for controlling a touch sensor and its touch sensing circuit, and particularly to a method for controlling a touch sensor applicable to a stylus and its related touch sensing circuit. Background Art

[0002] An active stylus is a common peripheral device that can be used in an electronic device with a touch screen, such as a mobile phone or a laptop computer. Most of the touch screens on the market currently are equipped with finger touch sensing and stylus control functions. When the active stylus touches or approaches the surface of the touch screen, the touch screen can communicate bidirectionally with the stylus through signal transmission.

[0003] When a user holds a stylus and inputs on the touch screen, due to the signal coupling between the touch screen and the user's hand, the signal strength received by the stylus may decrease. Summary of the Invention

[0004] Therefore, the main object of the present invention is to propose a method for enhancing the uplink signal for a stylus to improve the signal strength and solve the above problems at the same time.

[0005] An embodiment of the present invention discloses a method for controlling a touch sensor. The touch sensor has a plurality of touch sensing electrodes. The method includes the following steps: outputting an uplink signal to a first touch sensing electrode among the plurality of touch sensing electrodes; and outputting a reverse uplink signal to a second touch sensing electrode among the plurality of touch sensing electrodes. The uplink signal switches in a first direction, and the reverse uplink signal switches in a second direction opposite to the first direction.

[0006] Another embodiment of the present invention discloses a touch sensing circuit for controlling a touch sensor. The touch sensor has a plurality of touch sensing electrodes. The touch sensing circuit includes a touch front-end circuit. The touch front-end circuit is used to output an uplink signal to a first touch sensing electrode among the plurality of touch sensing electrodes and output a reverse uplink signal to a second touch sensing electrode among the plurality of touch sensing electrodes. The uplink signal switches in a first direction, and the reverse uplink signal switches in a second direction opposite to the first direction. Brief Description of the Drawings

[0007] Figure 1 Shows the interaction between a stylus and a touch screen.

[0008] Figure 2 Is a schematic diagram of an uplink transmission scheme for an embodiment of the present invention for a touch screen.

[0009] Figure 3Schematic diagram of another upstream transmission scheme for a touch screen according to an embodiment of the present invention.

[0010] Figure 4 Flow chart of a process according to an embodiment of the present invention.

[0011] Figure 5 Schematic diagram of a surface type touch sensor.

[0012] Figure 6 and Figure 7 Shows a user writing on a touch screen with a stylus held in different ways.

[0013] Figure 8 Schematic diagram of a touch control system according to an embodiment of the present invention.

[0014] Figure 9 Schematic diagram of a stacked structure of a surface type touch screen.

[0015] Figure 10 Schematic diagram of a stacked structure of an inlaid touch screen.

[0016] Among them, the reference numerals are explained as follows:

[0017] 100, 200 Stylus

[0018] 120, 220 Touch screen

[0019] 102, 202 Tip

[0020] 110, 210 Hand

[0021] VT Upstream signal

[0022] VS, VB Signals

[0023] VI Reverse upstream signal

[0024] 40 Process

[0025] 402~408 Steps

[0026] 50 Surface type touch sensor

[0027] R_1~R_N Row electrodes

[0028] C_1~C_M Column electrodes

[0029] 80 Touch control system

[0030] 800 Touch sensor

[0031] 810 Touch sensing circuit

[0032] 820 Host

[0033] 812 Touch Front-End Circuit

[0034] 814 Touch Controller

[0035] 816 Selection Circuit

[0036] 90 Surface-Type Touch Screen

[0037] 902, 1002 Pixel Array

[0038] 904, 1004 Color Filter Substrate

[0039] 906, 1006 Glass Cover Plate

[0040] 1000 In-Cell Touch Screen Detailed Implementation Manner

[0041] Figure 1 Illustrated is the interaction between a stylus 100 and a touch screen 120. As described above, the stylus 100 and the touch screen 120 can perform two-way communication. More specifically, the touch screen 120 can transmit an upstream signal to the stylus 100, and the stylus 100 can transmit a downstream signal to the touch screen 120, where the stylus 100 can be an active stylus having the function of actively outputting signals. The touch screen 120 can include a touch sensor composed of a plurality of touch sensing electrodes, and these touch sensing electrodes can transmit upstream signals to the stylus 100 and receive downstream signals from the stylus 100. The touch screen 120 can be integrated with a display screen to implement display and touch / stylus control functions; or the touch screen 120 can also be an independent touchpad without a display function. The touch screen 120 can be controlled by a touch sensing circuit or any appropriate control circuit.

[0042] The upstream signal can carry instructions that the touch sensing circuit wants to send to the stylus 100 to control the operation of the stylus 100. For example, an upstream instruction signal can notify the stylus 100 to change its operation mode or settings; or, the output of an upstream signal can be used to search for the stylus 100 that is in contact with or close to the touch screen 120. After the stylus 100 receives this upstream signal, it can send back a corresponding downstream signal to the touch screen 120, enabling the touch sensing circuit to determine the position of the stylus 100.

[0043] As Figure 1As shown, the touch screen 120 needs to transmit an uplink signal VT to the stylus 100 through touch sensing electrodes provided on the touch screen 120. This uplink signal VT can be received by the stylus 100 through the nib 102. However, due to signal coupling between the touch screen 120 and the user's hand 110, the signal VS actually received by the stylus 100 may be less than the transmitted uplink signal VT. In this case, a signal VB will be coupled to the body of the stylus 100 through the hand 110, causing the actually received signal VS to become VS = VT - VB. The decrease in signal strength reduces the efficiency of uplink transmission. For example, the sensing range of the stylus is reduced or the accuracy of stylus position detection decreases.

[0044] It can be seen therefrom that the uplink signal VT can be transmitted to the nib 102 to generate an effective signal component, but at the same time it is coupled to the body through the user's hand 110 to form a reducing component (i.e., VB). To improve the overall signal strength, in one embodiment, the touch screen can output an uplink signal through a touch sensing electrode that is interacting with the nib (such as contacting the nib or being closest to the nib when hovering), and at the same time output a reverse uplink signal through another touch sensing electrode that is in contact with the user's hand. In this case, the reverse uplink signal can be coupled to the body through the user's hand to enhance the uplink signal, thereby increasing the strength of the uplink signal actually received by the stylus.

[0045] Figure 2 FIG. is a schematic diagram of an uplink transmission scheme for a touch screen 220 according to an embodiment of the present invention. The touch screen 220 can interact with a stylus 200 held by a user's hand 210. The touch screen 220 can include a touch sensor having a plurality of touch sensing electrodes provided on the touch surface of the touch screen 220. The detailed operation modes of the stylus 200 and the touch screen 220 are similar to those of the stylus 100 and the touch screen 120 in Figure 1 and will not be repeated here.

[0046] In this example, the touch sensing electrodes included in the area interacting with the nib 202 of the stylus 200 can transmit an uplink signal VT; the touch sensing electrodes in the area where the user's hand 210 (such as the wrist, joint and / or palm) contacts can transmit a reverse uplink signal VI. In other words, the touch sensing circuit used to control the touch sensor and the touch screen 220 can output the uplink signal VT to the touch sensing electrodes located in the area where the nib 202 contacts (or the closest to the nib 202 when hovering), and at the same time output the reverse uplink signal VI to other touch sensing electrodes including the touch sensing electrodes contacted by the hand 210, where the reverse uplink signal VI can be a signal that is substantially opposite to the uplink signal VT. Therefore, the signal VS actually received by the stylus 200 will become VS = VT - VI, which is greater than the uplink signal VT transmitted by the touch screen 220.

[0047] In one embodiment, the reverse upward signal VI can be completely opposite to the upward signal VT, that is, the reverse upward signal VI and the upward signal VT have the same amplitude but different switching directions. Alternatively, the reverse upward signal VI and the upward signal VT may not be completely opposite signals. For example, the upward signal VT may have a first amplitude, and the reverse upward signal VI may have a second amplitude different from the first amplitude. The second amplitude can be set according to the first amplitude such that the signal strength of the reverse upward signal VI is equal to a specific ratio of the signal strength of the upward signal VT. As long as the upward signal VT switches in one direction while the reverse upward signal VI switches in the other direction relative to the switching direction of the upward signal VT, the related embodiments should fall within the scope of the present invention.

[0048] It should be noted that the transmission of the upward signal VT and the reverse upward signal VI can also be carried out in another way. Figure 3 FIG. is a schematic diagram of another upward transmission scheme for the touch screen 220 according to an embodiment of the present invention. In this example, one or more first touch sensing electrodes included in the area interacting with the tip 202 of the stylus 200 can transmit the upward signal VT; one or more second touch sensing electrodes in the area where the user's hand 210 contacts can transmit the reverse upward signal VI. At least one high-impedance area can be provided between the area interacting with the tip 202 and the area where the hand 210 contacts. One or more third touch sensing electrodes located in the high-impedance area can be controlled to be floating, and the third touch sensing electrodes can be located between the first touch sensing electrodes and the second touch sensing electrodes.

[0049] Through the floating control in the high-impedance area, it is possible to avoid adjacent touch sensing electrodes from receiving the upward signal VT and the reverse upward signal VI respectively. In this case, the interference between the upward signal VT and the reverse upward signal VI can be reduced or eliminated. It should be noted that the upward signal VT and the reverse upward signal VI are opposite to each other. Therefore, if these two signals are simultaneously applied to adjacent touch sensing electrodes, a huge capacitive load will be generated, and the setting of the high-impedance area can solve this problem.

[0050] In order to successfully output the upward signal VT to the tip 202 and output the reverse upward signal VI to the hand 210, before the upward signal VT and the reverse upward signal VI are output, a touch sensing operation can be performed to detect the position of the tip 202 and / or the position of the hand 210.

[0051] Figure 4 FIG. is a flowchart of a process 40 according to an embodiment of the present invention. The process 40 can be implemented in a touch sensing circuit for controlling a touch sensor and a touch screen, and this touch screen can be Figure 2 or Figure 3 the touch screen 220 inFigure 4 As shown, process 40 includes the following steps:

[0052] Step 402: Perform finger touch sensing to determine the position of the hand.

[0053] Step 404: Perform stylus sensing to determine the position of the tip of the stylus.

[0054] Step 406: Calculate the relative position between the tip of the stylus and the hand.

[0055] Step 408: According to the relative position, determine which touch sensing electrodes to output the upward signal to and which touch sensing electrodes to output the reverse upward signal to.

[0056] According to process 40, the touch sensing circuit can first perform finger touch sensing to determine the position of the hand 210 on the touch screen 220 (step 402). More specifically, the hand 210 of the user holding the stylus 200 may contact the touch screen 220 through the wrist, joints, and / or palm, and the contact position can be detected through the finger touch sensing operation. In addition, the touch sensing circuit can perform stylus sensing to determine the position of the tip 202 of the stylus 200 on the touch screen 220 (step 404). It should be noted that in another embodiment, the execution order of the finger touch sensing and the stylus sensing can also be interchanged without affecting the efficacy. Then, the touch sensing circuit can calculate the relative position between the tip 202 and the hand 210 (step 406), so as to determine the touch sensing electrode setting for upward signal transmission according to the position information obtained from the touch / stylus sensing results.

[0057] For example, in an on-cell or out-cell touch sensor, the touch sensing electrodes can be strip-shaped electrodes, and multiple row electrodes and multiple column electrodes therein intersect with each other to perform touch sensing. Figure 5 FIG. 50 is a schematic diagram of an on-cell touch sensor, which includes multiple row electrodes R_1 to R_N having horizontal strip shapes and multiple column electrodes C_1 to C_M having vertical strip shapes, where M and N can be any integers. The row electrodes R_1 to R_N and the column electrodes C_1 to C_M can be arranged in adjacent two layers to achieve mutual capacitive touch sensing.

[0058] The surface touch sensor 50 has both touch sensing and stylus control functions. In the touch sensing mode, the row electrodes R_1 to R_N can be used to output touch driving signals, and the column electrodes C_1 to C_M can be used to receive touch sensing signals; alternatively, the column electrodes C_1 to C_M can be used to output touch driving signals, and the row electrodes R_1 to R_N can be used to receive touch sensing signals. In the stylus mode, both the row electrodes R_1 to R_N and the column electrodes C_1 to C_M can be used to communicate with the stylus. Specifically, during the upstream transmission period, one or both of the row electrodes R_1 to R_N and the column electrodes C_1 to C_M can be used to transmit upstream signals; during the downstream transmission period, one or both of the row electrodes R_1 to R_N and the column electrodes C_1 to C_M can be used to receive downstream signals.

[0059] Based on the relative positions of the nib 202 and the hand 210 indicated by the finger touch and stylus sensing results, the touch sensing circuit can determine to output the upstream signal VT and the reverse upstream signal VI to the row electrodes R_1 to R_N or the column electrodes C_1 to C_M. In other words, the row electrodes R_1 to R_N or the column electrodes C_1 to C_M can be selectively applied with the upstream signal VT and the reverse upstream signal VI.

[0060] It should be noted that a general surface touch screen may include a plurality of transmission electrodes and a plurality of receiving electrodes. Among them, the upstream signal must be applied to the transmission electrodes, and the receiving electrodes can only receive the downstream signals but cannot be used to transmit the upstream signals. In contrast, the touch sensing circuit of the present invention can adopt different settings for the touch sensing electrodes according to the touch sensing results, and / or select different touch sensing electrodes to transmit the upstream signals, so that the nib and the user's hand can receive different upstream signals.

[0061] In one embodiment, the user can hold the stylus 200 in the manner shown in Figure 6 and write or draw on the touch screen 220. The touch sensing circuit can detect that the nib 202 is located in the upper region and the hand 210 touches the lower region of the touch screen 220. In this case, the row electrodes R_1 to R_N can be selected for signal transmission to effectively apply different upstream signals to the nib 202 and the hand 210. For example, the row electrodes interacting with the nib 202 (or additionally including some adjacent row electrodes) can be applied with the upstream signal VT, and the other row electrodes including the row electrodes in contact with the hand 210 can be applied with the reverse upstream signal VI.

[0062] In another embodiment, the user can hold the stylus in the manner as shown in Figure 7Hold the stylus 200 as shown and write or draw on the touch screen 220. The touch sensing circuit can detect that the tip 202 of the pen is located in the left area while the hand 210 touches the right area of the touch screen 220. In this case, column electrodes C_1 to C_M can be selected for signal transmission to effectively apply different upward signals to the tip 202 and the hand 210. For example, the column electrodes in contact with the hand 210 (or additionally including some adjacent column electrodes) can be applied with an inverted upward signal VI, while other column electrodes including the column electrodes interacting with the tip 202 can be applied with an upward signal VT.

[0063] Therefore, when the tip 202 of the pen and the user's hand 210 are approximately on the same horizontal line, it is preferably to use the column electrodes C_1 to C_M to transmit upward signals (including VT and VI) so that the tip 202 and the hand 210 can receive different upward signals. When the tip 202 of the pen and the user's hand 210 are approximately on the same vertical line, it is preferably to use the row electrodes R_1 to R_N to transmit upward signals (including VT and VI) so that the tip 202 and the hand 210 can receive different upward signals. In fact, the setting of the touch sensing electrodes can be configured and controlled in any way to apply the original upward signal VT to the touch sensing electrodes interacting with or in contact with the tip 202, while applying the inverted upward signal VI to the touch sensing electrodes in contact with the user's hand 210. Other touch sensing electrodes not in contact with any object can be applied with the upward signal VT or the inverted upward signal VI, or controlled to be floating according to system requirements.

[0064] Figure 8 It is a schematic diagram of a touch control system 80 according to Embodiment 1 of the present invention. The touch control system 80 includes a touch sensor 800, a touch sensing circuit 810, and a host 820. The touch sensor 800 can be a touch sensing device implemented on a touch screen (such as the touch screen 220 in the above embodiment). The touch sensor 800 can include a plurality of touch sensing electrodes disposed on the touch surface of the touch screen, wherein the touch sensing electrodes can include the above row electrodes and column electrodes, but are not limited thereto.

[0065] The touch sensing circuit 810 is a circuit device responsible for controlling the touch sensor 800. The touch sensing circuit 810 includes a touch front-end circuit 812 and a touch controller 814. The touch front-end circuit 812 can be an Analog Front-End (AFE) circuit, which can serve as an analog interface for signal transmission and reception with the touch sensor 800. In some embodiments, the touch front-end circuit 812 can output an up-signal and / or a reverse up-signal to a target touch sensing electrode in the touch sensor 800, so that the touch sensing electrode further transmits a signal to the stylus. The down-signal received by the touch sensing electrode from the stylus can also be transmitted to the inside of the touch sensing circuit 810 through the touch front-end circuit 812. In some embodiments, when the touch sensor 800 performs finger touch sensing, the touch front-end circuit 812 can also be used to process and send touch drive and sensing signals. In this case, the touch front-end circuit 812 can switch to different modes in response to the touch sensing and stylus control operations of the touch sensing circuit 810.

[0066] As Figure 8 shown, the touch front-end circuit 812 can include a selection circuit 816, which can provide an original up-signal and a reverse up-signal with different voltage swing directions. Each channel of the touch front-end circuit 812 can take out the original up-signal or the reverse up-signal from the selection circuit 816 to output to the target touch sensing electrode.

[0067] The touch controller 814 can be used to control the operation of the touch sensing circuit 810. For example, during a stylus control period, the touch controller 814 can control the touch front-end circuit 812 to output an up-signal to one or more specific touch sensing electrodes, or receive a down-signal from one or more specific touch sensing electrodes. During a touch sensing period, the touch controller 814 can control the touch front-end circuit 812 to perform touch sensing, such as outputting a touch drive signal to the row electrodes and correspondingly receiving a touch sensing signal from the column electrodes, and vice versa. In some embodiments, if the up-signal is output according to the touch sensing result, the touch controller 814 can determine the relative position of the pen tip and the user's hand, thereby controlling the setting of the touch sensing electrode and controlling the up-signal transmission of the touch front-end circuit 812. For example, based on the relative position of the pen tip and the user's hand, the touch controller 814 can determine which touch sensing electrode(s) the up-signal should be output to, and which touch sensing electrode(s) the reverse up-signal should be output to.

[0068] The touch controller 814 can be a core processor or controller for processing various operations of the touch sensing circuit 810. Examples of the touch controller 814 include, but are not limited to, a digital signal processing (DSP) circuit and a microcontroller unit (MCU). In one embodiment, the touch controller 814 can include or be coupled to a memory for storing necessary information (such as position information). For simplicity, the memory is omitted in Figure 8 the

[0069] The host 820 can be the main controller or processor of an electronic device including the touch sensor 800 and / or the corresponding touch screen. The host 820 is equipped with sufficient computing power to handle more complex operations. For example, by receiving the touch sensing signals from the touch controller 814, the host 820 can calculate the precise position of the touching finger or stylus, thereby implementing various functions.

[0070] It should be noted that the object of the present invention is to propose a method for enhancing the uplink signal for a stylus and its related touch sensing circuit. Those skilled in the art can make modifications or variations accordingly, which are not limited thereto. For example, the strip-shaped electrodes used in the above embodiments are only an example for illustrating the selection and setting of the touch sensing electrodes. In another embodiment, the touch sensing electrodes can have another shape or pattern, and the touch sensing circuit can select to output the uplink signal and the reverse uplink signal to any appropriate touch sensing electrodes according to the results of touch / stylus sensing. For example, assuming that the touch sensing electrodes of the touch sensor can be divided into a first group of touch sensing electrodes and a second group of touch sensing electrodes, according to the touch sensing results, the touch sensing circuit can output the uplink signal and / or the reverse uplink signal to the first group of touch sensing electrodes, or output the uplink signal and / or the reverse uplink signal to the second group of touch sensing electrodes.

[0071] In addition, in the above embodiments, the method of selecting to output the uplink signal and applying the reverse uplink signal can be implemented on a surface type touch screen. In another embodiment, the method proposed by the present invention can also be applied to an in-cell touch screen. The following describes the structural comparison between the surface type touch screen and the in-cell touch screen.

[0072] Figure 9A schematic diagram of the stacked structure of a surface type touch screen 90. The surface type touch screen 90 includes a display pixel array 902. A color filter (CF) substrate 904 is stacked on the pixel array 902, and a touch sensor can be implemented on the color filter substrate 904. In an embodiment, the touch sensor may include a plurality of row electrodes and a plurality of column electrodes that are interlaced with each other. Then, a cover glass (CG) 906 is stacked on the color filter substrate 904 to protect the internal materials and provide a touch surface.

[0073] Figure 10 A schematic diagram of the stacked structure of an in-cell touch screen 1000. The in-cell touch screen 1000 includes a display pixel array 1002, which can be integrated with a touch sensor array. In an embodiment, several display pixels can be coupled to each other to form a touch sensing electrode. A color filter substrate 1004 is stacked on the pixel array 1002. Then, a cover glass 1006 is stacked on the color filter substrate 1004 to protect the internal materials and provide a touch surface.

[0074] In the in-cell touch screen 1000, since the touch sensing electrodes are arranged in an array form, the touch sensing electrodes can be combined in an appropriate manner to transmit and receive stylus control signals, such as up signals and down signals. Therefore, according to the relative positions of the pen tip and the user's hand, the touch sensing electrodes can be combined horizontally or vertically, so that the pen tip and the user's hand can receive different up signals.

[0075] In summary, the present invention proposes a method for enhancing the up signal for a stylus and its related touch sensing circuit. During an up control period for the stylus, the touch sensing circuit outputs not only an up signal to the touch sensing electrode interacting with the pen tip, but also an inverse up signal to the touch sensing electrode contacted by the user's hand. In this case, the signal coupled from the user's hand to the pen body will enhance the strength of the up signal. In an embodiment, a high impedance region can be set between the region interacting with the pen tip and the region contacted by the hand, and the touch sensing electrodes located in the high impedance region can be controlled to be floating, so as to reduce the interference between the up signal and the inverse up signal. In an embodiment, the up signal can be output according to a touch sensing result indicating the relative positions of the pen tip and the user's hand, so that the pen tip and the hand can respectively receive the original up signal and the inverse up signal.

[0076] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling a touch sensor, the touch sensor having a plurality of touch sensing electrodes, characterized in that, The method includes: Output an upward signal to a first touch sensing electrode among the plurality of touch sensing electrodes; and Output a reverse upward signal to a second touch sensing electrode among the plurality of touch sensing electrodes; wherein, the upward signal switches in a first direction, and the reverse upward signal switches in a second direction opposite to the first direction.

2. The method according to claim 1, wherein The reverse upward signal is substantially opposite to the upward signal.

3. The method according to claim 1, characterized in that The upward signal has a first amplitude, and the reverse upward signal has a second amplitude, wherein the second amplitude is set according to the first amplitude.

4. The method according to claim 1, wherein The reverse upward signal and the upward signal are output simultaneously.

5. The method according to claim 1, characterized in that It further includes: Control a third touch sensing electrode among the plurality of touch sensing electrodes to float; wherein, the third touch sensing electrode is located between the first touch sensing electrode and the second touch sensing electrode.

6. The method according to claim 1, wherein It further includes: Before outputting the upward signal and the reverse upward signal, output a touch driving signal to the plurality of touch sensing electrodes to perform touch sensing, so as to generate a touch sensing result.

7. The method according to claim 6, wherein It further includes: According to the touch sensing result, determine a setting of the plurality of touch sensing electrodes.

8. The method according to claim 6, characterized in that The plurality of touch sensing electrodes include a first group of touch sensing electrodes and a second group of touch sensing electrodes, and the method further includes: According to the touch sensing result, determine to output the upward signal and the reverse upward signal to the first group of touch sensing electrodes or the second group of touch sensing electrodes.

9. The method according to claim 6, wherein The touch sensing result includes the relative position of a pen tip and a hand.

10. The method according to claim 9, characterized in that, The plurality of touch sensing electrodes include a plurality of row electrodes and a plurality of column electrodes, and the method further includes: According to the relative position of the pen tip and the hand, determine to output the upward signal and the reverse upward signal to the plurality of row electrodes or the plurality of column electrodes.

11. The method according to claim 10, wherein The plurality of touch sensing electrodes are strip-shaped electrodes, each of the plurality of row electrodes has a horizontal long strip shape, and each of the plurality of column electrodes has a vertical long strip shape.

12. The method according to claim 1, characterized in that, The upward signal is transmitted to a touch pen.

13. A touch sensing circuit for controlling a touch sensor having a plurality of touch sensing electrodes, characterized in that, The touch sensing circuit includes a touch front-end circuit, and the touch front-end circuit is used to: Output an upward signal to a first touch sensing electrode among the plurality of touch sensing electrodes; and Output a reverse upward signal to a second touch sensing electrode among the plurality of touch sensing electrodes; wherein, the upward signal switches in a first direction, and the reverse upward signal switches in a second direction opposite to the first direction.

14. The touch sensing circuit according to claim 13, wherein The reverse upward signal is substantially opposite to the upward signal.

15. The touch sensing circuit according to claim 13, characterized in that, The upward signal has a first amplitude, and the reverse upward signal has a second amplitude, wherein the second amplitude is set according to the first amplitude.

16. The touch sensing circuit according to claim 13, wherein The touch front-end circuit outputs the reverse upward signal and the upward signal simultaneously.

17. The touch sensing circuit according to claim 13, wherein The touch front-end circuit is further used to control a third touch sensing electrode among the plurality of touch sensing electrodes to float; wherein, the third touch sensing electrode is located between the first touch sensing electrode and the second touch sensing electrode.

18. The touch sensing circuit according to claim 13, wherein It further includes a touch controller, which is used to control the touch front-end circuit to output a touch driving signal to the plurality of touch sensing electrodes to perform touch sensing before the upward signal and the reverse upward signal are output, so as to generate a touch sensing result.

19. The touch sensing circuit according to claim 18, wherein, The touch controller also determines a setting of the plurality of touch sensing electrodes according to the touch sensing result.

20. The touch sensing circuit according to claim 18, wherein, The plurality of touch sensing electrodes include a first group of touch sensing electrodes and a second group of touch sensing electrodes, and the touch controller also determines to output the upward signal and the reverse upward signal to the first group of touch sensing electrodes or the second group of touch sensing electrodes according to the touch sensing result.

21. The touch sensing circuit according to claim 18, wherein, The touch sensing result includes a relative position between a pen tip and a hand.

22. The touch sensing circuit according to claim 21, wherein The plurality of touch sensing electrodes include a plurality of row electrodes and a plurality of column electrodes, and the touch controller also determines to output the upward signal and the reverse upward signal to the plurality of row electrodes or the plurality of column electrodes according to the relative position between the pen tip and the hand.

23. The touch sensing circuit according to claim 22, wherein The plurality of touch sensing electrodes are strip-shaped electrodes, each of the plurality of row electrodes has a horizontal long strip shape, and each of the plurality of column electrodes has a vertical long strip shape.

24. The touch sensing circuit according to claim 13, wherein The upward signal is transmitted to a stylus.

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