Mutual capacitance detection device, method, control device, and computer-readable storage medium

Abstract

This application relates to the field of mutual capacitance detection technology, and provides a mutual capacitance detection device, method, control device, and computer-readable storage medium. The mutual capacitance detection device includes: a sensing chip and a sensing signal receiving channel, an excitation signal driving channel, a comparison channel, and a comparison receiving channel disposed around the sensing chip. The sensing signal receiving channel, excitation signal driving channel, comparison channel, and comparison receiving channel are all located within the sensing area of ​​the sensing chip. This application can reduce chip costs while achieving adaptive mutual capacitance detection under various environments.

Description

Technical Field

[0001] This application belongs to the field of mutual capacitance detection technology, and particularly relates to mutual capacitance detection devices, methods, control devices and computer-readable storage media. Background Technology

[0002] Current mutual capacitance detection methods typically involve adding a dummy channel outside the sensing area (e.g., inside the sensing chip). Because this dummy channel is unaffected by the proximity of external conductors, its induced signal value is fixed and can be set to 0, allowing for the calculation of induced signal values ​​for all channels. However, precisely because this dummy channel is unaffected by external conductors, its noise interference and environmental variations differ from those in the active channels. Therefore, the load resistor and capacitor of this dummy channel must be close to the loads of other channels; otherwise, the calculated induced signal values ​​for other channels will exceed their range. Consequently, the chip requires larger adjustable resistors and capacitors, increasing chip area and cost, as well as the dummy channel adjustment process. Summary of the Invention

[0003] This application provides mutual capacitance detection apparatus, method, control device, and computer-readable storage medium to reduce chip costs and achieve adaptive mutual capacitance detection under various environments.

[0004] This application is achieved through the following technical solution:

[0005] In a first aspect, embodiments of this application provide a mutual capacitance detection device, including: a sensing chip and a sensing signal receiving channel, an excitation signal driving channel, a comparison channel and a comparison receiving channel disposed around the sensing chip, wherein the sensing signal receiving channel, the excitation signal driving channel, the comparison channel and the comparison receiving channel are all located within the sensing area of ​​the sensing chip.

[0006] The comparison channel and the comparison receiving channel can be connected through the first mutual capacitance under test, and the excitation signal driving channel and the induction signal receiving channel can be connected through the second mutual capacitance under test.

[0007] The induction signal receiving channel, excitation signal driving channel, comparison receiving channel, and comparison channel are stacked in a layered structure, with the induction signal receiving channel and comparison receiving channel located in the lower layer of the stacked structure, and the excitation signal driving channel and comparison channel located in the upper layer of the stacked structure.

[0008] The driving excitation signal drives the driving channel and the comparison channel to obtain multiple induced signal quantity differences. Based on the multiple induced signal quantity differences, the capacitance values ​​of the first mutual capacitance to be measured and the second mutual capacitance to be measured are obtained. The induced signal quantity difference is the difference between the induced signal quantities of two adjacent channels in the multiple induced signal receiving channels and the comparison receiving channel.

[0009] In conjunction with the first aspect, in some possible implementations, the comparison channel and the excitation signal driving channel have the same structure, and the comparison receiving channel and the induction signal receiving channel have the same structure.

[0010] In conjunction with the first aspect, in some possible implementations, there are multiple sensing signal receiving channels, which are set up in parallel; and comparison receiving channels are set up in parallel on one side of the multiple sensing signal receiving channels.

[0011] In conjunction with the first aspect, in some possible implementations, there are multiple excitation signal driving channels, which are set in parallel; there are multiple comparison channels, which are set in parallel; the multiple excitation signal driving channels and the multiple comparison channels are located on the same straight line in a one-to-one correspondence, and there is a gap between the corresponding excitation signal driving channels and the comparison channels.

[0012] When the mutual capacitance detection device is working, multiple sets of corresponding excitation signal drive channels and comparison channels are selected and driven.

[0013] In conjunction with the first aspect, in some possible implementations, the mutual capacitance detection device further includes: a bandpass filter disposed around the sensing chip; the bandpass filter is used to filter out noise in the induced signal quantity, which is the induced signal quantity generated by the induced signal receiving channel or the comparison receiving channel.

[0014] In conjunction with the first aspect, in some possible implementations, the mutual capacitance detection device further includes: a charge amplifier disposed around the sensing chip; the charge amplifier is used to amplify the induced signal quantity, which is the induced signal quantity generated by the induced signal receiving channel or the comparison receiving channel.

[0015] Secondly, embodiments of this application provide a mutual capacitance detection method, which is based on a mutual capacitance detection device and includes:

[0016] The driving excitation signal drives the channel, while the comparison channel remains at a low level, thus obtaining the difference in the amount of induced signal. The difference in the amount of induced signal is the difference between the amounts of induced signal between any two adjacent channels in the multiple induced signal receiving channels and the comparison receiving channel.

[0017] The capacitance values ​​of multiple mutual capacitors are calculated based on the difference in the induced signal quantity.

[0018] In conjunction with the second aspect, in some possible implementations, the mutual capacitance is calculated based on the difference in induced signal quantities, including:

[0019] Based on the difference in the amount of inductive signal, the amount of inductive signal received by each inductive signal receiving channel and the amount of inductive signal received by the comparison receiving channel are obtained.

[0020] Based on the induced signal value of each induced signal receiving channel and the induced signal value of the comparison receiving channel, the capacitance values ​​of multiple mutual capacitors are obtained.

[0021] Thirdly, embodiments of this application provide a control device, including: a processor and a memory, the memory being used to store a computer program, wherein the processor executes the computer program to implement the mutual capacitance detection method as described in any of the second aspects.

[0022] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the mutual capacitance detection method as described in any of the second aspects.

[0023] Fifthly, embodiments of this application provide a computer program product that, when run on a control device, causes the control device to execute the mutual capacitance detection method described in any of the second aspects above.

[0024] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0025] The beneficial effects of the embodiments in this application compared with the prior art are:

[0026] The sensing signal receiving channel, excitation signal driving channel, comparison channel, and comparison receiving channel of this application are set in the sensing area of ​​the sensing chip, so that the sensing chip does not need to add adjustable resistors and capacitors, which can reduce chip cost and avoid adjustment process. Since the noise interference of each channel is consistent in the sensing area, noise interference can be avoided to the greatest extent when the difference is calculated, and the capacitance value of mutual capacitance can be obtained more accurately.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a mutual capacitance detection device provided in an embodiment of this application;

[0030] Figure 2This is a top view of the stacked structure of a mutual capacitance detection device provided in an embodiment of this application;

[0031] Figure 3 This is a schematic flowchart of a mutual capacitance detection method provided in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of a mutual capacitance detection circuit provided in an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the structure of a control device provided in an embodiment of this application. Detailed Implementation

[0034] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0035] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0036] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0037] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0038] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0040] Figure 1 This is a schematic diagram of a mutual capacitance detection device provided in an embodiment of this application. The mutual capacitance detection device includes: a sensing chip 10 and a sensing signal receiving channel (such as...) disposed around the sensing chip 10. Figure 1 The examples 101 to 105 are illustrated using five sensing signal receiving channels as an example, but are not limited to these. The excitation signal driving channel 201, the comparison channel 301, and the comparison receiving channel 401 are all located within the sensing area of ​​the sensing chip.

[0041] The comparison channel 301 and the comparison receiving channel 401 can be connected through the first mutual capacitance under test C1, and the excitation signal driving channel 201 and the sensing signal receiving channel 101 can be connected through the second mutual capacitance under test C2.

[0042] Specifically, the excitation signal driving channel 201 and the sensing signal receiving channel 102 can be connected through the third mutual capacitance under test C3; the excitation signal driving channel 201 and the sensing signal receiving channel 103 can be connected through the fourth mutual capacitance under test C4; the excitation signal driving channel 201 and the sensing signal receiving channel 104 can be connected through the fifth mutual capacitance under test C5; and the excitation signal driving channel 201 and the sensing signal receiving channel 105 can be connected through the sixth mutual capacitance under test C6.

[0043] The induction signal receiving channel 101, the excitation signal driving channel 201, the comparison channel 301 and the comparison receiving channel 401 are stacked in a layered structure. The induction signal receiving channel and the comparison receiving channel 401 are located in the lower layer of the stacked structure, and the excitation signal driving channel 201 and the comparison channel 301 are located in the upper layer of the stacked structure.

[0044] The driving excitation signal drives channel 201 and comparison channel 301 to obtain multiple induced signal quantity differences. Based on the multiple induced signal quantity differences, the capacitance values ​​of the first mutual capacitance C1 and the second mutual capacitance C2 to be measured are obtained. The induced signal quantity difference is the difference between the induced signal quantities of two adjacent channels in the multiple induced signal receiving channels and comparison receiving channels.

[0045] Specifically, with Figure 1 For example, the capacitance values ​​of the mutual capacitances to be tested are C1, C2, C3, C4, C5 and C6.

[0046] For example, the comparison channel 301 has the same structure as the excitation signal driving channel 201, and the comparison receiving channel 401 has the same structure as the sensing signal receiving channel 101.

[0047] For example, there are multiple sensing signal receiving channels, which are arranged in parallel; comparison receiving channels are arranged in parallel on one side of the multiple sensing signal receiving channels.

[0048] For example, there are multiple excitation signal driving channels 201 arranged in parallel; there are multiple comparison channels arranged in parallel; the multiple excitation signal driving channels and the multiple comparison channels are located on the same straight line in a one-to-one correspondence, and there is a gap between the corresponding excitation signal driving channels and the comparison channels.

[0049] When the mutual capacitance detection device is working, multiple sets of corresponding excitation signal drive channels and comparison channels are selected and driven.

[0050] Specifically, such as Figure 2 As shown, the excitation signal drive channel is: TX m+1,L TX m,L and TX m-1,L The comparison channel is: TX m+1,R TX m,R and TX m-1,R The induction signal receiving channel is: RX n-2 RX n-1 RX n RX n+1 The receiving channel for comparison is: RX non Inductive signal receiving channel (RX) n-2 RX n-1 RX n RX n+1 ) and the comparison receiving channel (RX) non Located on the same layer, and in the lower layer of the stacked structure; excitation signal drive channel (TX) m+1,L TX m,L and TX m-1,L ) and contrast channel (TX)m+1,R TX m,R and TX m-1,R Located on the same layer, and on the upper layer of the stacked structure. From a top-down view, the angle between the upper and lower layers of the stacked structure is 90°, meaning the angle between the straight line containing the excitation signal driving channel and the straight line containing the induction signal receiving channel is 90°. This is done to maximize the mutual capacitance value to be measured. In other feasible solutions, the angle can be other angles, such as 60°, 45°, or 30°, which can be adjusted according to the specific environment.

[0051] Specifically, when the mutual capacitance detection device is working, it is not a set of corresponding excitation signal drive channels and comparison channels that are working, but multiple sets of excitation signal drive channels and comparison channels are working. At this time, multiple sets of mutual capacitance values ​​can be obtained. In order to make the detected mutual capacitance values ​​more accurate, the capacitance values ​​of multiple sets of mutual capacitance values ​​can be averaged to obtain the average mutual capacitance value. The mutual capacitance value at this time is more accurate.

[0052] For example, the mutual capacitance detection device further includes: a bandpass filter disposed around the sensing chip; the bandpass filter is used to filter out noise in the sensed signal, the sensed signal being the sensed signal generated by the sensed signal receiving channel or the comparison receiving channel.

[0053] For example, the mutual capacitance detection device further includes: a charge amplifier disposed around the sensing chip; the charge amplifier is used to amplify the induced signal quantity, which is the induced signal quantity generated by the induced signal receiving channel or the comparison receiving channel.

[0054] The following combination Figure 1 The mutual capacitance detection method of this application is described in detail.

[0055] Figure 3 This is a schematic flowchart of a mutual capacitance detection method provided in an embodiment of this application, with reference to... Figure 3 The mutual capacitance detection method is described in detail below:

[0056] Step 101: Drive the excitation signal driving channel, keep the comparison channel at a low level, and obtain the difference in the amount of sensed signal. The difference in the amount of sensed signal is the difference in the amount of sensed signal between any two adjacent channels in the multiple sensed signal receiving channels and the comparison receiving channel.

[0057] Step 102: Calculate the capacitance values ​​of multiple mutual capacitors based on the difference in the induced signal quantity.

[0058] For example, calculating mutual capacitance based on the difference in induced signal quantities includes: obtaining the induced signal quantity value of each induced signal receiving channel and the induced signal quantity value of the comparison receiving channel based on the difference in induced signal quantities; and obtaining the capacitance values ​​of multiple mutual capacitances based on the induced signal quantity values ​​of each induced signal receiving channel and the comparison receiving channel.

[0059] In the above mutual capacitance detection method, the sensing signal receiving channel, the excitation signal driving channel, the comparison channel, and the comparison receiving channel are set in the sensing area of ​​the sensing chip. This eliminates the need to add adjustable resistors and capacitors to the sensing chip, reducing chip costs and avoiding adjustment processes. Furthermore, since the noise interference of each channel is consistent within the sensing area, noise interference can be minimized during differential calculation, resulting in a more accurate determination of the mutual capacitance value.

[0060] Figure 4 This is a schematic diagram of a mutual capacitance detection circuit provided in an embodiment of this application. The excitation signal driving channel is: TX m,L The comparison channel is: TX m,R The induction signal receiving channel is: RX n-3 RX n-2 RX n-1 RX n The receiving channel for comparison is: RX n+1 The capacitor to be tested is C m,n+1 C m,n C m,n-1 C m,n-2 and C m,n-3 BPF is a bandpass filter, and F1 and F2 are signal receivers. Vn represents the noise signal, and the Cs capacitor connected to it represents the capacitance relative to ground for each of the different induced signal receiving channels. Since the induced signal receiving channels have the same structure, theoretically the Cs capacitance value is the same.

[0061] Specifically, in this embodiment, the comparison channel level is always low.

[0062] Specifically, the difference in the induced signal is obtained using the following formula:

[0063]

[0064] Among them, Data n RX is the difference in the amount of induced signal between any two adjacent channels. n RX represents the induced signal quantity value of the induced signal receiving channel. non To compare the induced signal values ​​of the receiving channels, the above formula, after simplification, yields the induced signal value of the receiving channel for each channel:

[0065]

[0066] Based on the above formula, the induced signal value of each channel is obtained, and the capacitance value of the mutual capacitance to be measured can be calculated based on the induced signal value of each channel.

[0067] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0068] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0069] This application also provides a control device, see [link to relevant documentation] Figure 5 The control device 500 may include at least one processor 510 and a memory 520, the memory 520 being used to store a computer program 521. The processor 510 is used to call and run the computer program 521 stored in the memory 520 to implement the steps in any of the above method embodiments, for example... Figure 3 Steps 101 to 102 in the illustrated embodiment.

[0070] For example, computer program 521 may be divided into one or more modules / units, one or more of which are stored in memory 520 and executed by processor 510 to complete this application. The one or more modules / units may be a series of computer program segments capable of performing specific functions, which describe the execution process of the computer program in control device 500.

[0071] Those skilled in the art will understand that Figure 5 This is merely an example of a control device and does not constitute a limitation on the control device. It may include more or fewer components than shown, or combine certain components, or different components, such as input / output devices, network access devices, buses, etc.

[0072] The processor 510 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0073] The memory 520 can be an internal storage unit of the control device or an external storage device, such as a plug-in hard drive, a smart media card (SMC), a secure digital card (SD), or a flash card. The memory 520 is used to store the computer program and other programs and data required by the control device. The memory 520 can also be used to temporarily store data that has been output or will be output.

[0074] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0075] The mutual capacitance detection method provided in this application can be applied to dedicated mutual capacitance detection equipment, computers, wearable devices, vehicle-mounted devices, tablet computers, laptop computers, netbooks, and other devices. This application does not impose any restrictions on the specific type of control device.

[0076] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps in the various embodiments of the mutual capacitance detection method described above.

[0077] This application provides a computer program product that, when run on a mobile terminal, enables the mobile terminal to implement the steps in the various embodiments of the mutual capacitance detection method described above.

[0078] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying the computer program code to the photographing device / control device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, such as a USB flash drive, a portable hard drive, a magnetic disk, or an optical disk.

[0079] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0080] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0081] In the embodiments provided in this application, it should be understood that the disclosed apparatus / network devices and methods can be implemented in other ways. For example, the apparatus / network device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0082] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0083] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A mutual capacitance detection device, characterized in that, It includes a sensing chip and a sensing signal receiving channel, an excitation signal driving channel, a comparison channel, and a comparison receiving channel disposed around the sensing chip. The sensing signal receiving channel, the excitation signal driving channel, the comparison channel, and the comparison receiving channel are all located within the sensing area of ​​the sensing chip; the comparison channel is kept at a low level. The comparison channel and the comparison receiving channel can be connected through a first mutual capacitance under test, and the excitation signal driving channel and the sensing signal receiving channel can be connected through a second mutual capacitance under test. The sensing signal receiving channel, the excitation signal driving channel, the comparison receiving channel, and the comparison channel are stacked in a layered structure. The sensing signal receiving channel and the comparison receiving channel are located in the lower layer of the stacked structure, and the excitation signal driving channel and the comparison channel are located in the upper layer of the stacked structure. The excitation signal driving channel and the comparison channel are driven to obtain multiple induced signal quantity differences. Based on the multiple induced signal quantity differences, the capacitance values ​​of the first mutual capacitance to be tested and the second mutual capacitance to be tested are obtained. The induced signal quantity difference is the difference between the induced signal quantities of two adjacent channels in the multiple induced signal receiving channels and the comparison receiving channel. The excitation signal driving channels are multiple, and the multiple excitation signal driving channels are arranged in parallel; the comparison channels are multiple, and the multiple comparison channels are arranged in parallel; the multiple excitation signal driving channels and the multiple comparison channels are located on the same straight line in a one-to-one correspondence, and there is a gap between the corresponding excitation signal driving channels and the comparison channels; When the mutual capacitance detection device is working, it selects and drives multiple sets of corresponding excitation signal driving channels and comparison channels.

2. The mutual capacitance detection device as described in claim 1, characterized in that, The comparison channel has the same structure as the excitation signal driving channel, and the comparison receiving channel has the same structure as the sensing signal receiving channel.

3. The mutual capacitance detection device as described in claim 1, characterized in that, The induction signal receiving channel is multiple, and the multiple induction signal receiving channels are arranged in parallel; the comparison receiving channel is arranged in parallel on one side of the multiple induction signal receiving channels.

4. The mutual capacitance detection device as described in claim 1, characterized in that, The mutual capacitance detection device further includes: a bandpass filter disposed around the sensing chip; the bandpass filter is used to filter out noise in the sensed signal, the sensed signal being the sensed signal generated by the sensed signal receiving channel or the comparison receiving channel.

5. The mutual capacitance detection device as described in claim 1, characterized in that, The mutual capacitance detection device further includes: a charge amplifier disposed around the sensing chip; the charge amplifier is used to amplify the induced signal quantity, which is the induced signal quantity generated by the induced signal receiving channel or the comparison receiving channel.

6. A method for detecting mutual capacitance, characterized in that, The mutual capacitance detection method is based on the mutual capacitance detection device as described in any one of claims 1 to 5, and includes: A drive excitation signal drive channel is used, while a comparison channel remains at a low level to obtain a difference in the amount of sensed signal. This difference in sensed signal is the difference in the amount of sensed signal between any two adjacent channels in the plurality of sensed signal receiving channels and the comparison receiving channel. The drive excitation signal drive channel is a plurality of channels arranged in parallel. The comparison channel is also a plurality of channels arranged in parallel. Each drive excitation signal drive channel and each comparison channel corresponds to one another and is located on the same straight line, with a gap between the corresponding drive excitation signal drive channel and the comparison channel. Based on the difference in the sensed signal, the capacitance values ​​of multiple mutual capacitors are calculated.

7. The mutual capacitance detection method as described in claim 6, characterized in that, The calculation of mutual capacitance based on the difference in the sensed signal quantity includes: Based on the difference in the amount of sensed signal, the sensed signal value of each sensed signal receiving channel and the sensed signal value of the comparison receiving channel are obtained. Based on the induced signal value of each induced signal receiving channel and the induced signal value of the comparison receiving channel, the capacitance values ​​of multiple mutual capacitors are obtained.

8. A control device, characterized in that, include: A processor and a memory, the memory for storing a computer program, the processor for calling and running the computer program stored in the memory to implement the mutual capacitance detection method as described in any one of claims 6 to 7.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the mutual capacitance detection method as described in any one of claims 6 to 7.

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