WO2018157268A1

WO2018157268A1 - Method and device for touch detection

Info

Publication number: WO2018157268A1
Application number: PCT/CN2017/075085
Authority: WO
Inventors: 陈小祥; 周威
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2017-02-28
Filing date: 2017-02-28
Publication date: 2018-09-07
Also published as: CN109074201A

Abstract

A method and a device for touch detection. The method comprises: using a first signal inputting mode to input signals into a plurality of driving lines, wherein, under the first signal inputting mode, a positive signal is inputted into the first driving line among the plurality of driving lines, no signal is inputted into the second driving line, and the first driving line and the second driving line are adjacent (110); determining, according to the value of a change in the quantity of signals outputted by the plurality of driving lines under the first signal inputting mode, whether a touch surface is in a watery state (120). The method and device for touch detection can accurately detect watery state.

Description

Touch detection method and device

Technical field

Embodiments of the present invention relate to the field of information technology, and, more particularly, to a method and apparatus for touch detection.

Background technique

With the development of human-machine interface technology, touch-sensing technology has been widely used due to its comfortable operation and convenience. Especially in consumer electronics such as notebook computers, mobile phones, and MP3s, touch pads, touch screens, and touch buttons are widely used in such electronic products. Among the touch technologies, the more advanced one is capacitive touch technology.

The principle of capacitive touch sensing can be described as: detecting the capacitance between the sensing electrode itself or the two sensing electrodes through one or more capacitive sensors, and judging the change of the capacitance to determine the touch of the finger or other object on the sensing electrode ( Touch).

At present, the common coding method for capacitive screens is the mutual coupling capacitance (mutual capacitance) and the self-coupling capacitance (self-capacitance). Different coding methods will have different data characteristics for touch characterization. The identification of water states (also known as water states) has been the most common and difficult problem facing touch screens. When there is dripping water on the screen, water film and water on the finger, the touch screen may be invalid, and the finger touch may not be accurately recognized, or abnormal clicks and scribing may occur. Therefore, how to accurately detect the water state becomes a technical problem to be solved urgently.

Summary of the invention

Embodiments of the present invention provide a method and apparatus for touch detection, which can accurately detect a water state.

In a first aspect, a method of touch detection is provided, comprising:

The plurality of driving lines are coded by using a first coding mode, wherein, in the first coding mode, the first driving line of the plurality of driving lines is positive coded, and the second driving line is not coded. The first driving line and the second driving line are adjacent to each other;

Determining whether the touch surface is in a water state according to a change value of the signal amount output by the plurality of driving lines in the first coding mode.

In the embodiment of the present invention, the plurality of driving lines are coded by using the first coding mode, and according to the first The change value of the signal amount outputted by the plurality of driving lines in a coder mode determines whether the touch surface is in a water state. The technical solution of the embodiment of the present invention can accurately detect the water state, because the change value of the semaphore of the output of the drive line is different from that of the normal touch.

In some possible implementations, the multiple driving lines include 2k driving lines, where k is a positive integer, and the first driving line includes the first, third, ..., 2k of the plurality of driving lines - 1 drive line, the second drive line comprising 2, 4, ..., 2k drive lines of the plurality of drive lines.

In some possible implementations, determining whether the touch surface is in a water state according to a change value of the signal quantity output by the plurality of driving lines in the first coding mode, including:

And if the change value of the signal amount output by the second driving line is less than a predetermined threshold, determining that the touch surface is in a water state, wherein the predetermined threshold value is a negative value.

In some possible implementations, the method further includes:

The plurality of driving lines are coded by using a second coding mode, wherein, in the second coding mode, the plurality of driving lines are all playing a positive code;

Determining a touch point on the touch surface according to a change value of a signal amount output by the plurality of driving lines in the second coding mode.

In some possible implementations, the first coding mode and the second coding mode are alternately employed.

In some possible implementations, after determining that the touch surface is in a water state, the second coding mode is employed.

In some possible implementations, determining the touch point on the touch surface according to the change value of the signal quantity output by the multiple driving lines in the second coding mode, including:

Performing noise reduction processing on the change value of the signal quantity output by the plurality of driving lines in the second coding mode;

A touch point on the touch surface is determined based on the data after the noise reduction process.

In some possible implementations, after determining that the touch surface is in a water state, a mutual capacitance waterproofing process is performed.

In a second aspect, an apparatus for touch detection is provided, comprising means for performing the method of the first aspect or any of the possible implementations of the first aspect.

In a third aspect, an apparatus for touch detection is provided, including a processor and a memory. The memory is used to store instructions that the processor uses to execute the instructions. The processor executes the instructions stored by the memory The execution causes the processor to perform the method of the first aspect or any possible implementation of the first aspect.

According to a fourth aspect, there is provided an electronic device comprising the device of the touch detection of the second aspect or the third aspect described above.

In a fifth aspect, a computer readable medium is provided for storing a computer program, the computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.

DRAWINGS

FIG. 1 is a schematic flowchart of a method for touch detection according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a normal touch in the first coding mode according to the embodiment of the present invention.

FIG. 3 is a schematic diagram of a water state in a first coding mode according to an embodiment of the present invention.

FIG. 4 is another schematic flowchart of a method for touch detection according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a water state in a second coding mode according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a normal touch in a second coding mode according to an embodiment of the present invention.

FIG. 7 is a data curve obtained by using a second coding method according to an embodiment of the present invention.

FIG. 8 is a graph of data noise reduction processing according to an embodiment of the present invention.

9 is a schematic block diagram of an apparatus for touch detection according to an embodiment of the present invention.

FIG. 10 is a schematic block diagram of an apparatus for touch detection according to another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present invention can be applied to various touch electronic devices, such as mobile terminals, computers, and the like.

In an embodiment of the invention, the water state represents a touch surface, such as the surface of a touch screen or touch pad, in the state of water. The technical solution of the embodiment of the invention can accurately detect the water state, so that the electronic device can operate normally in the presence of water.

In the embodiment of the present invention, the term "coding" may also be referred to as "signaling". The drive line is coded to indicate the input signal to the input of the drive line.

In the embodiment of the present invention, the change value of the semaphore (also referred to as a difference value) is a change value obtained by subtracting the original semaphore from the original semaphore. It should be understood that the original semaphore can be the original semaphore as a reference. It is updated with the baseline update, not every frame.

FIG. 1 shows a schematic flow chart of a method 100 of touch detection according to an embodiment of the present invention. As shown in FIG. 1, the method 100 can include:

110. The first driving mode is used to code a plurality of driving lines, wherein, in the first coding mode, the first driving line of the plurality of driving lines is positive code, and the second driving circuit is not playing. a code, the first driving line and the second driving line are adjacent to each other;

120. Determine, according to the change value of the signal quantity output by the multiple driving lines in the first coding mode, whether the touch surface is in a water state.

In the embodiment of the present invention, the water state detection is implemented by using the first coding mode. The first coding mode is alternate coding mode, that is, one drive line is playing a positive code, the next drive line is not coded, and so on.

For example, if the plurality of driving lines include 2k driving lines, wherein k is a positive integer, the first driving line includes the first, third, ..., 2k-1 driving lines of the plurality of driving lines The second driving circuit includes 2, 4, ..., 2k driving lines of the plurality of driving lines. That is to say, the first, third, ..., 2k-1 drive lines are positive, and the 2, 4, ..., 2k drive lines are not coded.

The following two driving lines are taken as an example to describe the working principle of the first coding mode.

FIG. 2 is a schematic diagram of a normal touch in the first coding mode. In FIG. 2, TX1 is the transmitting end of the first driving line, that is, the input end, and RX1 is the receiving end of the first driving line, that is, the output end. In the first coding mode, TX1 plays a positive signal, and TX2 does not make a signal. When a normal finger is touched, C1 will increase and a human body-to-ground capacitance C2 will appear. Capacitor C1 will introduce the signal on TX1 to TX2, and RX2 will receive the signal imported through C1. At the same time, C2 will import the signals of TX1 and TX2 to the ground. Under normal circumstances, C2 is larger than C1. Therefore, most of the semaphores of TX1 and TX2 are introduced to the ground, and RX1 appears. The value detected by RX2 is smaller than the original one, and positive values appear.

Fig. 3 is a schematic view showing the water state in the first coding mode. In FIG. 3, TX1 is the transmitting end of the first driving line, that is, the input end, and RX1 is the receiving end of the first driving line, that is, the output end. In the first coding mode, TX1 plays a positive signal, and TX2 does not make a signal. In the water state, the water-to-ground capacitance can be neglected, and C1 will increase. The role of C1 is to transfer the TX1 signal to TX2. As C1 increases, RX1 will receive less signal than the original, and a positive change will occur. RX2 will receive more semaphores than the original, and a negative change will occur. The overall characteristic of all drive lines is the phenomenon of positive and negative alternating. Based on this, the water state can be well recognized.

In the embodiment of the present invention, determining whether the touch surface is in a water state according to a change value of a signal amount output by the plurality of driving lines in the first coding mode. As described above, in the water state, a negative change value occurs at the output of the second drive line. Therefore, the water state can be determined according to the change value of the signal amount outputted by the second drive line.

Optionally, in an embodiment of the present invention, if the change value of the signal quantity output by the second driving line is less than a predetermined threshold, determining that the touch surface is in a water state, wherein the predetermined threshold value is a negative value.

Specifically, in the water state, the change value of the signal amount output by the second driving line is a negative value, and therefore, the touch surface may be determined to be in a water state when the change value of the signal amount output by the second driving line is less than a predetermined threshold. Wherein the predetermined threshold is a negative value.

The accuracy of the judgment can be improved by comparing with the predetermined threshold. However, this should not be construed as limiting the embodiments of the invention. That is to say, it is also possible to determine that the touch surface is in a water state when the change value of the signal amount outputted by the second driving line is a negative value.

Optionally, the determination may also be performed according to data of multiple frames. For example, if the change value of the semaphore output by the second driving line is less than a predetermined threshold in the data of consecutive multiple frames (such as 3 frames), it is determined that the touch surface is in a water state.

Optionally, the determination may be further performed in combination with a change value of the signal amount output by the first driving line. For example, in addition to the condition of the change value of the signal amount output by the second drive line, the touch surface is determined to be in a water state in combination with the condition that the change value of the signal amount output by the first drive line is a positive value.

In the embodiment of the present invention, the plurality of driving lines are coded by using the first coding mode, and the touch surface is determined to be in a water state according to the change value of the signal quantity outputted by the plurality of driving lines in the first coding mode. The technical solution of the embodiment of the present invention can accurately detect the water state, because the change value of the semaphore of the output of the drive line is different from that of the normal touch.

The state of the water may affect the determination of the touch point, for example, there may be a point of occurrence, a point of elimination, or a disconnection.

The pointing point indicates that the screen displays a touch without a normal touch; the erasing point refers to the screen not displaying the touch in the case of a normal touch; the broken line refers to the multi-finger operation when the scribing is performed, the screen cannot completely output the drawn track.

In view of this, the embodiment of the present invention further provides another coding mode to accurately determine the touch point.

As shown in FIG. 4, the method 100 may further include:

130. Code the plurality of driving lines by using a second coding manner, where the second In the coding mode, the plurality of driving lines are all playing a positive code;

140: Determine a touch point on the touch surface according to a change value of a signal quantity output by the plurality of driving lines in the second coding mode.

Specifically, in the second coding mode, multiple driving lines are positively coded, so that the influence of water is small, and thus the true touch point can be accurately determined. Referring to FIG. 5 and FIG. 6, the working principle of the second coding mode will be described by taking two driving lines as an example.

Fig. 5 is a schematic view showing the water state in the second coding mode. In FIG. 5, TX1 is the transmitting end of the first driving line, that is, the input end, and RX1 is the receiving end of the first driving line, that is, the output end. In the second coding mode, both TX1 and TX2 play a positive signal. In the water state, C1 will increase, but since TX1 and TX2 are both at the same time, the potential difference between them is relatively small, and the signal flowing on C1 will be small, so the influence on the signals received by RX1 and RX2 will be smaller.

FIG. 6 is a schematic diagram of a normal touch in the second coding mode. In FIG. 6, TX1 is the transmitting end of the first driving line, that is, the input end, and RX1 is the receiving end of the first driving line, that is, the output end. In the second coding mode, both TX1 and TX2 play a positive signal. When a normal finger is touched, C1 will increase and a human body-to-ground capacitance C2 will appear. The signal passed in C1 will be small, but there will be a lot of signals flowing in C2. Therefore, the semaphores received by RX1 and RX2 will change greatly, and positive changes will occur.

From the above, in the second coding mode, the influence of water is small, so that the water caused by the water can be suppressed, thereby accurately determining the true touch point.

Optionally, the first coding mode and the second coding mode may be alternately adopted. For example, the current frame adopts the first coding mode, and the next frame adopts the second coding mode.

Optionally, after determining that the touch surface is in a water state, the second coding mode is adopted.

Specifically, after determining the water state, only the second coding mode can be used to suppress the water-induced drop, thereby accurately determining the touch point.

In the embodiment of the present invention, in the second coding mode, the touch point on the touch surface is determined according to the change value of the signal quantity output by the plurality of driving lines in the second coding mode. For example, whether or not it is a touch point can be determined according to whether the change value of the semaphore is greater than a threshold.

When all the positive codes are used, the collected self-contained data is easily disturbed, such as interference from a liquid crystal display (LCD). Therefore, optionally, the variation value of the signal quantity output by the plurality of driving lines in the second coding mode may be first subjected to noise reduction processing; and then the data on the touch surface is determined according to the data after the noise reduction processing. Touch the point.

For example, the data in the second coding mode is first subjected to noise reduction processing, and after noise reduction, it is determined whether there is a touch according to the threshold.

FIG. 7 is a data curve obtained by using the second coding method when two fingers are touched, and FIG. 8 is a curve after the data noise reduction processing of FIG. 7.

When touching two fingers on the screen, a point may pop up due to water. In this case, if the Touch column is marked according to the mutual capacitance difference value, d1, d2; d5, d6, and d7; and d11, d12, and d13 are marked. If you do not waterproof, there will be 3 points. But from the self-constrained difference (Figure 7), there are only two convex hulls. The self-tolerance difference is subjected to noise reduction processing to obtain Figure 8. The embodiment of the present invention does not limit the manner of noise reduction processing. For example, the difference between each marker point can be subtracted from the average of two adjacent unmarked points, such as d5, d6, and d7 minus (d4+d8)/2, respectively. According to Fig. 8, by the threshold judgment, the flags of d1 and d2 can be canceled, thereby suppressing the dot.

The data collected in the first coding mode and the second coding mode in the embodiment of the present invention is self-contained data. Therefore, the detection method in the embodiment of the present invention is a self-capacity detection mode.

Alternatively, the various embodiments described above may also be implemented in combination with mutual waterproofing. For example, the mutual resistance water repellent treatment may be performed after determining that the touch surface is in a water state. The mutual-capacity waterproofing process can adopt any mutual-capacity waterproofing technology, which is not limited by the embodiment of the present invention.

After the initial power-on or frequency hopping, the self-capacity reference can not be restored to normal immediately. At this time, the self-capacity water state detection and point suppression can be performed, and the mutual-capacity water state detection can be turned on. After the self-capacity reference is updated, the mutual-capacity water state detection is turned off, and the self-capacity water state detection and suppression are turned on.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

The method of touch detection of the embodiment of the present invention is described in detail above, and the apparatus for touch detection of the embodiment of the present invention will be described below.

It should be understood that the apparatus in the embodiments of the present invention may perform the method in the embodiment of the present invention, and have the function of executing the corresponding method.

FIG. 9 shows a schematic block diagram of a device 900 for touch detection in accordance with an embodiment of the present invention. As shown in FIG. 9, the apparatus 900 can include:

a plurality of drive lines 920;

The coding module 930 is configured to code the plurality of driving lines 920 by using a first coding mode, wherein, in the first coding mode, the first driving line of the plurality of driving lines 920 is played a positive code, the second driving line is not coded, and the first driving line and the second driving line are adjacent to each other;

The processing module 940 is configured to determine, according to the change value of the signal quantity output by the plurality of driving lines 920 in the first coding mode, whether the touch surface is in a water state.

Optionally, in the embodiment of the present invention, the multiple driving lines 920 include 2k driving lines, where k is a positive integer, and the first driving line includes the first and third of the plurality of driving lines. , ..., 2k-1 drive lines, the second drive line comprising 2, 4, ..., 2k drive lines of the plurality of drive lines.

Optionally, in the embodiment of the present invention, the processing module 940 is configured to: if the change value of the semaphore output by the second driving line is less than a predetermined threshold, determine that the touch surface is in a water state, wherein The predetermined threshold is a negative value.

Optionally, in the embodiment of the present invention, the coding module 930 is configured to code the multiple driving lines 920 by using a second coding mode, where, in the second coding mode, The plurality of driving lines 920 are all positively coded;

The processing module 940 is configured to determine a touch point on the touch surface according to a change value of a signal quantity output by the plurality of driving lines 920 in the second coding mode.

Optionally, in the embodiment of the present invention, the coding module 930 is configured to alternately adopt the first coding mode and the second coding mode.

Optionally, in the embodiment of the present invention, the coding module 930 is configured to adopt the second coding mode after determining that the touch surface is in a water state.

Optionally, in the embodiment of the present invention, the processing module 940 is configured to perform noise reduction processing on a change value of a signal quantity output by the multiple driving lines in the second coding mode; The subsequent data determines touch points on the touch surface.

Optionally, in the embodiment of the present invention, the processing module 940 is configured to perform mutual capacitance waterproof processing after determining that the touch surface is in a water state.

The touch detection device 900 of the embodiment of the present invention may correspond to the execution body of the touch detection method of the embodiment of the present invention, and the above and other operations and/or functions of the respective modules in the touch detection device 900 are respectively for the foregoing respective methods. The corresponding process, for the sake of brevity, will not be described here.

FIG. 10 shows a schematic block diagram of a device 1000 for touch detection according to another embodiment of the present invention. As shown in FIG. 10, the apparatus 1000 includes a plurality of drive lines 1020, a processor 1030, and a memory 1040.

The memory 1040 is for storing programs. Specifically, the program may include program code, the process The sequence code includes computer operating instructions. Memory 1040 can include read only memory and random access memory and provides instructions and data to processor 1030. The memory 1040 may include a high-speed random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage.

Alternatively, a program for implementing the method of touch detection of the embodiment of the present invention described above may be stored in the memory 1040.

Optionally, the processor 1030 executes a program stored in the memory 1040 for performing the touch detection method of the embodiment of the present invention described above.

Processor 1030 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1030 or an instruction in a form of software. The processor 1030 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc., or may be a digital signal processor (DSP), dedicated. Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 1040, and the processor 1030 reads the information in the memory 1040 and performs the steps of the above method in combination with its hardware.

The embodiment of the invention further provides an electronic device, which may include the device for touch detection in the above embodiment of the invention.

It is to be understood that the specific embodiments of the present invention are not intended to limit the scope of the embodiments of the invention.

It should be understood that in the embodiment of the present invention, the term "and/or" is merely an association relationship describing an associated object, indicating that there may be three relationships. For example, A and/or B may indicate that A exists separately, and A and B exist simultaneously, and B cases exist alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. Including a plurality of instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the methods of the various embodiments of the present invention Step by step. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention by any person skilled in the art. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A method for touch detection, comprising:

The plurality of driving lines are coded by using a first coding mode, wherein, in the first coding mode, the first driving line of the plurality of driving lines is positive coded, and the second driving line is not coded. The first driving line and the second driving line are adjacent to each other;

Determining whether the touch surface is in a water state according to a change value of the signal amount output by the plurality of driving lines in the first coding mode.
The method of claim 1 wherein said plurality of drive lines comprises 2k drive lines, wherein k is a positive integer, said first drive line comprising a first of said plurality of drive lines, 3, ..., 2k-1 drive lines, the second drive line comprising 2, 4, ..., 2k drive lines of the plurality of drive lines.
The method according to claim 1 or 2, wherein the determining whether the touch surface is in a water state according to a change value of the signal amount output by the plurality of driving lines in the first coding mode comprises:

And if the change value of the signal amount output by the second driving line is less than a predetermined threshold, determining that the touch surface is in a water state, wherein the predetermined threshold value is a negative value.
The method according to any one of claims 1 to 3, further comprising:

The plurality of driving lines are coded by using a second coding mode, wherein, in the second coding mode, the plurality of driving lines are all playing a positive code;

Determining a touch point on the touch surface according to a change value of a signal amount output by the plurality of driving lines in the second coding mode.
The method according to claim 4, wherein said first coding mode and said second coding mode are alternately employed.
The method according to claim 4 or 5, wherein the second coding mode is employed after determining that the touch surface is in a water state.
The method according to any one of claims 4 to 6, wherein the determining on the touch surface is based on a change value of a signal amount output by the plurality of driving lines in the second coding mode Touch points, including:

Performing noise reduction processing on the change value of the signal quantity output by the plurality of driving lines in the second coding mode;

A touch point on the touch surface is determined based on the data after the noise reduction process.
The method according to any one of claims 1 to 7, wherein after determining that the touch surface is in a water state, a mutual capacitance waterproofing process is performed.
A device for touch detection, comprising:

Multiple drive lines;

a coding module, configured to code the plurality of driving lines by using a first coding mode, wherein, in the first coding mode, a first one of the plurality of driving lines is positive coded, The second driving line is not coded, and the first driving line and the second driving line are adjacent to each other;

And a processing module, configured to determine, according to the change value of the signal quantity output by the plurality of driving lines in the first coding mode, whether the touch surface is in a water state.
The apparatus according to claim 9, wherein said plurality of driving lines comprise 2k driving lines, wherein k is a positive integer, said first driving line comprising a first one of said plurality of driving lines, 3, ..., 2k-1 drive lines, the second drive line comprising 2, 4, ..., 2k drive lines of the plurality of drive lines.
The device according to claim 9 or 10, wherein the processing module is configured to determine that the touch surface is in a water state if a change value of a signal amount output by the second driving line is less than a predetermined threshold. Wherein the predetermined threshold is a negative value.
The apparatus according to any one of claims 9 to 11, wherein the coding module is configured to code the plurality of driving lines by using a second coding mode, wherein, in the second In the coding mode, the plurality of driving lines are all playing a positive code;

The processing module is configured to determine a touch point on the touch surface according to a change value of a signal amount output by the plurality of driving lines in the second coding mode.
The apparatus according to claim 12, wherein said coding module is configured to alternately adopt said first coding mode and said second coding mode.
The device according to claim 12 or 13, wherein the coding module is configured to adopt the second coding mode after determining that the touch surface is in a water state.
The apparatus according to any one of claims 12 to 14, wherein the processing module is configured to reduce a change value of a signal quantity output by the plurality of driving lines in the second coding mode Noise processing; determining touch points on the touch surface based on the data after the noise reduction processing.
The apparatus according to any one of claims 9 to 15, wherein the processing module is configured to perform a mutual capacitance waterproofing process after determining that the touch surface is in a water state.