Pressure-touch sensor based on common electrode structure and application thereof

Abstract

The invention relates to the field of sensors, in particular to a pressure-tactile sensor based on a common electrode structure and application thereof, and the pressure-tactile sensor comprises a first electrode layer, an air dielectric layer, a conductive layer, a mixed pressure sensitive layer and a second electrode layer from top to bottom, wherein the air dielectric layer is formed at the middle position by arranging insulating cushion blocks at the edge between the first electrode layer and the conductive layer, and an output electrode layer is arranged between the insulating cushion block at one side and the conductive layer. The sensor can be used in wearable health equipment to realize health monitoring, can be integrated to a signal acquisition and processing system, and is combined with a graphical programming platform to realize accurate control of electronic piano key tones and volumes. Good application prospects and important technical development potential are shown in the fields of intelligent interaction interfaces, intelligent musical instruments, human-computer interaction and the like.

Description

Technical Field

[0001] The present invention relates to the field of sensors, and particularly to a pressure-tactile sensor based on a common electrode structure and its applications. Background Art

[0002] The skin is an important interface for the human body to perceive the external environment, capable of perceiving different degrees of external pressure, various shapes and textures, temperature and humidity changes, etc. Human exteroception can reverse the passive intention based on touch characteristics. High-precision human-computer interaction requires accurate recognition of touch control intentions so that the machine can make correct responses and decisions. Tactile perception is of great significance in intelligent motion monitoring, robotic dexterous operation, and (AR / VR) interaction. Tactile sensors can convert the amount of touch actions into signals recognizable by machines, providing important support for analyzing touch control intentions. Position and pressure are the main characteristics describing touch behaviors. The separate recognition of these two characteristics is not sufficient to fully recognize touch interaction intentions in complex environments. Comprehensive and accurate touch recognition requires the synergistic effect between touch position and pressure. However, the current main method to simultaneously obtain pressure magnitude and position information is to integrate multiple sensors into a sensing array. The tactile sensor array consists of numerous sensing units. Although only a few sensing units are stimulated during a single touch action, all sensing units send characteristic signals to the processing module, most of which are unnecessary redundant data. This increases the unnecessary processing burden brought by the separation of feature perception and parsing. In addition, the discrete arrangement of sensing units imposes limitations on the continuity of touch characteristics. This may lead to the loss of key feature information, making it impossible for the machine to accurately recognize touch control actions and their potential intentions. Summary of the Invention

[0003] In order to achieve the control of the key tone and volume of an intelligent piano and combine programming to achieve intelligent touch interaction functions, the present invention proposes a pressure-tactile sensor based on a common electrode structure. The pressure-tactile sensor includes, from top to bottom, a first electrode layer, an air dielectric layer, a conductive layer, a hybrid pressure-sensitive layer, and a second electrode layer. The air dielectric layer is formed by setting insulating pads at the edges between the first electrode layer and the conductive layer to form an air dielectric layer in the middle position, and an output electrode layer is provided between the insulating pad on one side and the conductive layer. For the convenience of measurement, the lead wires of the first electrode layer and the second electrode layer can be located on the same side, and the lead wire of the output electrode layer is located on the other side opposite to the lead wires of the first electrode layer and the second electrode layer.

[0004] Further, the first electrode layer and the output electrode layer are indium tin oxide / polyethylene terephthalate (PET), silver nanowire / polyethylene terephthalate (PET), graphene / polyethylene naphthalate (PEN), Ecoflex / polydimethylsiloxane (PDMS), or carbon nanotube / polydimethylsiloxane (PDMS). Ecoflex is a fossil-based biodegradable and compostable plastic developed by BASF. It belongs to the polybutylene terephthalate - adipate material category and has characteristics such as elasticity, waterproofness, and processability. It is widely used in the packaging and bioplastic fields.

[0005] Further, the conductive layer is made by coating a layer of graphite on a flexible paper with a microporous structure, and the side coated with graphite faces the first electrode layer.

[0006] Further, when the first electrode layer is externally excited, it makes the first electrode layer contact the conductive layer, and a circuit is formed among the first electrode layer, the conductive layer, and the output electrode layer. The contact point between the first electrode layer and the conductive layer is determined by measuring the resistance value of this circuit.

[0007] Further, when the first electrode layer is externally excited, the first electrode layer and the second electrode layer act as electrode plates, and the air dielectric layer and the hybrid pressure-sensitive layer act as dielectric layers to form a capacitive structure. The magnitude of the external force received by the first electrode layer is determined by measuring the capacitance value between the first electrode layer and the second electrode layer.

[0008] Further, the conductive layer is made by coating a layer of graphite on a flexible paper with a microporous structure, and the side coated with graphite faces the first electrode layer. Preferably, the flexible paper with a microporous structure can be A4 paper, grid paper, sketch paper, etc. The most preferred option is grid paper. Preferably, a graphite layer is formed by evenly coating back and forth on the paper with a pencil containing graphite of hardness grades such as 2B, 4B, 7B, 8B, etc. The most preferred option is to choose a 4B hardness grade pencil for coating.

[0009] Preferably, the insulating spacer is made of hard materials such as polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), fluorinated ethylene propylene copolymer (FEP), ethylene - tetrafluoroethylene copolymer (ETFE), etc. The most preferred option is polytetrafluoroethylene (PTFE); the thickness of its insulating spacer is between 2 mm and 4 mm, and the optimal height is 2 mm.

[0010] Further, the preparation process of the hybrid pressure-sensitive layer includes:

[0011] Disperse the high dielectric constant material powder in a non-polar solution, and perform primary deagglomeration through ultrasonic treatment for 1 h. The high dielectric filling material is one or more of graphene, single-walled carbon nanotubes, multi-walled carbon nanotubes, conductive carbon black, metal nanoparticles, and metal nanowires. The preferred option is multi-walled carbon nanotubes; the non-polar organic solvents include non-polar organic solvents such as n-hexane, n-heptane, petroleum ether, cyclohexane, and isohexane. The preferred option is n-hexane;

[0012] Inject the polymer matrix into the dispersion liquid and construct a homogeneous solution through mechanical stirring; preferably, the polymer matrix includes one or more of polydimethylsiloxane, polyethylene terephthalate, polytetrafluoroethylene, polyimide, silica gel, and BASF copolyester. The preferred option is polydimethylsiloxane PDMS; the optimal mass percentage of the high dielectric filling material to the polymer matrix is 1%

[0013] Perform degassing treatment on the homogeneous solution in a vacuum drying oven for 20 minutes to eliminate micropore defects;

[0014] Use the spin coating process to form a film on a glass substrate and thermally cure it at 90 °C for 1 h to form a hybrid pressure-sensitive layer with a thickness of 200 ± 15 μm.

[0015] The present invention also provides an application of a pressure-tactile sensor based on a common electrode structure, including a pressure-tactile sensor based on a common electrode structure. Prepare the surface of the first electrode of the pressure-tactile sensor into a piano key pattern. Connect the first electrode layer and the output electrode layer of the pressure-tactile sensor to a KEYSIGHT digital multimeter module for resistance signal acquisition, and connect the first electrode layer and the output electrode layer of the pressure-tactile sensor to an LCR digital bridge module for capacitance signal acquisition. Map the piano key pattern to the resistance signal and the capacitance signal. When it is detected that the positioning of the piano key position is triggered, map the detected resistance signal to the volume parameter corresponding to the piano key and the capacitance signal to the tone frequency parameter corresponding to the piano key.

[0016] The beneficial effects of a pressure-tactile sensor based on a common electrode structure and its application according to the present invention include:

[0017] 1. The positioning layer of the present invention forms a graphite conductive layer based on a paper substrate. Different from traditional silicon-based substrates, paper is considered a new substrate for manufacturing functional electronic products due to its low cost, easy fabrication, convenience, and recyclability. The combination of a nanoporous cellulose paper substrate and a carbon material constitutes a cost-effective energy storage device. Due to the thinness and flexibility of the paper, the device will adapt to various shape and space requirements.

[0018] 2. The present invention adopts a common electrode design to ingeniously combine the positioning layer and the pressure sensing layer, enabling the simultaneous detection of two signals, pressure and position, with a three - electrode structure. Moreover, the pressure and position respectively adopt capacitive and resistive pressure sensing principles to collect changes in capacitance values and resistance values, avoiding the problem of signal interference in general dual - mode sensors and also eliminating the complex process of requiring a signal input decoupling algorithm model, greatly reducing the back - end data processing tasks.

[0019] 3. The present invention adopts a common electrode design, integrating the positioning layer into a part of the capacitance layer, greatly simplifying the architecture of the designed device.

[0020] 4. Through the flexible position - pressure intelligent tactile sensor of the present invention, when identifying the electrical signals of the external mechanical stimulus position and pressure, a dedicated data - processing program is developed on the MATLAB platform to read the serial data stream of the digital bridge in real - time; further, a graphical piano simulation interface is constructed, and an algorithm is designed to achieve the feature analysis of the resistance - capacitance signals, where the resistance value is dynamically mapped to the piano volume parameter, and the capacitance value corresponds to the tone frequency parameter in real - time; finally, through signal threshold division and pattern recognition algorithms, an accurate correspondence between tactile input and music output is established to complete the development of an intelligent piano system with tactile interaction function. This work not only opens up new potential for the application of paper - like devices in robot tactile perception but also brings new ideas for the preparation and development of interactive electronic products related to humans. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a pressure - tactile sensor based on a common electrode structure of the present invention;

[0022] Figure 2 It is a positioning operation mechanism diagram of a pressure - tactile sensor based on a common electrode structure of the present invention;

[0023] Figure 3 It is a pressure measurement operation mechanism diagram of a pressure - tactile sensor based on a common electrode structure of the present invention;

[0024] Figure 4 It is a graph of the linear curve of the positioning layer and the sensitivity curve of the pressure sensing layer of a flexible position - pressure intelligent tactile sensor based on a common electrode structure of the present invention;

[0025] Figure 5 It is an embodiment of the application of a pressure - tactile sensor based on a common electrode structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the mapping relationship between the piano key pattern and the resistance signal and capacitance signal in the application of a pressure - tactile sensor based on a common electrode structure of the present invention;

[0027] Among them, 1. The first electrode layer; 2. The insulating spacer; 3. The output electrode; 4. The conductive layer; 5. The hybrid pressure-sensitive layer; 6. The second electrode layer. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The present invention proposes a pressure-tactile sensor based on a common electrode structure, such as Figure 1 , the pressure-tactile sensor includes a first electrode layer, an air dielectric layer, a conductive layer, a hybrid pressure-sensitive layer, and a second electrode layer from top to bottom. The air dielectric layer forms an air dielectric layer at the middle position by setting insulating spacers at the edges between the first electrode layer and the conductive layer, and an output electrode layer is arranged between the insulating spacer on one side and the conductive layer.

[0030] In the solution of the present invention, a positioning layer is formed by the first electrode layer, the air dielectric layer, the conductive layer, the insulating spacer, and the output electrode layer. As Figure 2 shown, in the absence of external contact, the air dielectric layer prevents direct contact between the conductive layer and the first electrode layer. When an external mechanical stimulus is applied to the surface of the positioning layer, the first electrode layer contacts the conductive layer, and the resistance between the first electrode layer and the output electrode is:

[0031] R = R1(X) + R2 + R3(X)

[0032] Wherein, R is the resistance between the first electrode layer and the output electrode; R1(X) is the resistance from the output lead end of the first electrode layer to the contact point, and this resistance is related to the dielectric constant of the first electrode layer and the straight-line distance from the output lead end of the first electrode layer to its contact with the conductive layer; R2 is the contact resistance between the first electrode layer and the conductive layer; R3(X) is the resistance from the output lead end of the output electrode layer to the contact point, and this resistance is related to the dielectric constant of the graphite layer, the dielectric constant of the output electrode layer, and the straight-line distance between the contact point and the output electrode layer; those skilled in the art can obtain the above relationship through experimental fitting, and this embodiment will not be elaborated further.

[0033] In the present invention, the first electrode layer, the air dielectric layer, the conductive layer, the hybrid pressure-sensitive layer, the second electrode layer, the insulating spacer, and the output electrode layer together form a pressure sensor. The working principle of a traditional capacitive pressure sensor is similar to that of a parallel plate capacitor, which consists of an elastic dielectric layer in the middle and upper and lower electrode layers. The definition formula of capacitance is:

[0034] C = ε0ε r / Ad

[0035] Where C is the capacitance value, ε0 is the permittivity of free space, ε r is the relative permittivity of the dielectric layer, A is the overlapping area of the upper and lower electrode plates, and d is the distance between the upper and lower electrode plates. In the pressure sensor of the present invention, the overlapping area of the electrode plates is not affected by the applied pressure, and ε0 is a constant value. Therefore, the change in capacitance (C) is mainly determined by the relative permittivity ε r and the distance d between the upper and lower electrodes.

[0036] To more precisely illustrate the pressure sensing principle of the fabricated sensor, Figure 3 a simplified equivalent circuit diagram is given. When the sensor is not under pressure, the capacitance of the entire sensor can be represented by the series connection of two parts: C1 represents the air layer separated by an insulating gasket, and C2 represents the capacitance with a hybrid sensitive layer formed by mixing a high permittivity material and a polymer matrix as the dielectric layer. When a slight pressure is applied to the sensor, the air layer is compressed, and the distance d between the two electrode plates decreases. On the other hand, the compression of air and the increase in density can cause ε r to increase slightly, but this effect is usually much smaller than the influence of the spacing change; when the pressure is further increased, the air is gradually replaced by the high permittivity hybrid sensitive layer, and its composite material follows the percolation threshold theory.

[0037] The hybrid pressure-sensitive layer at the core of the pressure sensing is fabricated by a simple mixing process of a high permittivity material and a polymer matrix, specifically including:

[0038] First, the high permittivity material powder is dispersed in a non-polar solution, and primary deagglomeration is achieved by ultrasonic treatment for 1 h. The mass ratio of the high permittivity material powder to the non-polar solution is 1:2, and the mass ratio of the high permittivity material to the polymer matrix is 1% - 2.6%, with an optimal mass ratio of 2%;

[0039] Then, the polymer matrix is injected into the dispersion, and a homogeneous solution is constructed by mechanical stirring (600 rpm, 1 h);

[0040] Subsequently, degassing treatment is carried out in a vacuum drying oven for 20 minutes to eliminate micropore defects;

[0041] Then, a film is formed on a glass substrate by spin coating (250 rpm, 20 s), and finally thermally cured at 90 °C for 1 h to form a dielectric layer with a thickness of 200 ± 15 μm (surface roughness Ra = 8.2 μm);

[0042] Finally, the fabricated hybrid sensitive dielectric layer is cut into a shape consistent with the positioning layer and placed on the electrode film.

[0043] Example 1

[0044] In this example, ITO / PET is selected for the first electrode layer 1 and the output electrode layer 6 to form parallel electrode plates. Polytetrafluoroethylene with a thickness of 2 mm is selected as the insulating spacer 2. A conductive layer 4 is prepared by coating a 4B pencil on graph paper to form uniform graphite. A copper film is set on the graphite at the edge of the conductive layer to form the output electrode 3, and MWCNT / PDMS is selected as the capacitive sensitive layer. The specific structure is as Figure 1 shown.

[0045] As an alternative implementation, the four sides of 3M tape are fixed on the surface of the graph paper, and then a 4B pencil is used for two-way repeated friction. The tape is peeled off to form a continuous and uniform graphite conductive layer in the target area of the graph paper; a 25-μm-thick copper foil (purity ≥ 99.9%) is used to construct a circuit connection point at the right end edge of the graphite layer; the graph paper covered with the graphite layer is placed face to face with the ITO / PET electrode, and polytetrafluoroethylene pads (about 2 mm) are used at both ends to maintain a small gap.

[0046] In this example, the hybrid pressure-sensitive layer is prepared by a simple mixing process of MWCNTs and PDMS, which specifically includes the following steps:

[0047] First, 0.1 g of MWCNTs powder (purity > 98%, diameter 20 - 30 nm) is dispersed in 15 ml of n-hexane solution, and primary deagglomeration is achieved by ultrasonic treatment for 1 h;

[0048] Then, 4.95 g of PDMS (Sylgard 184, mass ratio of base gel to curing agent 10:1) is injected into the dispersion liquid, and a uniform solution is constructed by mechanical stirring (600 rpm, 1 h);

[0049] Subsequently, degassing treatment is carried out in a vacuum drying oven for 20 minutes to eliminate micropore defects;

[0050] Then, a spin coating process (250 rpm, 20 s) is used to form a film on a glass substrate, and finally, thermal curing is carried out at 90 °C for 1 h to form a dielectric layer with a thickness of 200 ± 15 μm (surface roughness Ra = 8.2 μm);

[0051] Then, the prepared MWCNT / PDMS dielectric layer is cut into a shape consistent with the size of the positioning layer and placed on the ITO / PET film;

[0052] Finally, the positioning layer and the pressure sensing layer are fixed together in layers through 3M tape to form a touchable positioning sensor.

[0053] To test the performance of the flexible position-pressure intelligent tactile sensor, in this embodiment, a flexible position-pressure intelligent tactile sensor with dimensions of 7 cm × 0.5 cm × 0.4 cm was fabricated to demonstrate touch positioning and pressure sensing performance. As Figure 4 shown in A, there is a strong linear relationship between the position and the corresponding resistance value, and the linear fitting coefficient (R2) exhibits an excellent linearity of 0.996. The excellent response time of the positioning layer enables the sensor to quickly detect external stimuli, thus achieving a rapid response. The surface of the 2wt% MWCNT / PDMS composite material exhibits a spontaneous wrinkled structure, and the irregular and randomly distributed wrinkles generated due to the aggregation of carbon nanotubes contribute to the formation of microstructures on the surface of the dielectric layer, thereby improving the sensor sensitivity. The sensitivity test curve of the pressure sensing layer is shown in Figure 4 (B), demonstrating its excellent sensitivity and wide measurement range. According to the sensitivity to pressure, the curve can be divided into two different regions, with sensitivities of 5.65416 KPa -1 (1 - 20 KPa), 0.07696 KPa -1 (20 - 45 KPa), and 0.02576 KPa -1 (45 - 180 KPa), respectively.

[0054] Example 2

[0055] This embodiment is implemented on the basis of Example 1. The surface of the first electrode of the pressure-tactile sensor in the example is prepared as a piano key pattern. The first electrode layer and the output electrode layer of the pressure-tactile sensor are connected to the KEYSIGHT digital multimeter module for resistance signal acquisition, and the first electrode layer and the output electrode layer of the pressure-tactile sensor are connected to the LCR digital bridge module for capacitance signal acquisition. The piano key pattern is mapped to the resistance signal and the capacitance signal. When the positioning of the piano key position is detected and triggered, the detected resistance signal is mapped to the volume parameter corresponding to the piano key, and the capacitance signal is mapped to the tone frequency parameter corresponding to the piano key.

[0056] Figure 3 shows the basic circuit diagram for intelligent piano development, including a pressure-tactile sensor, a KEYSIGHT digital multimeter for collecting the resistance signal of the pressure-tactile sensor, an LCR digital bridge module for collecting the capacitance signal of the pressure-tactile sensor, and a host computer for analyzing signals, mapping signals, and playing according to the mapping relationship.

[0057] As Figure 6As shown, in this embodiment, the piano pattern provided on the surface of the first electrode layer of the pressure-tactile sensor is divided into seven parts corresponding to the tones of Do, Re, Mi, Fa, Sol, La, and Xi. When a certain part is touched, each part feeds back different touch positions to trigger the corresponding tone. Despite large variations in pressure, the accuracy of position perception is basically not affected. In addition, gradient volume control is an important factor in musical expression and is difficult to achieve using common location-based interfaces. In this embodiment, by setting capacitance thresholds, the touch pressure is divided into three categories: light pressure (<20 kPa), medium pressure (>20 kPa and <45 kPa), and heavy pressure (>45 kPa). According to the triggered tone, these pressure categories respectively correspond to low, medium, and high volumes, which enables users to precisely adjust the intensity of the triggered tone. Additionally, those skilled in the art can divide more intervals for mapping according to actual needs to overcome the limitations of location-based interfaces in adjusting the conducting intensity in the application of the present invention. To visualize volume control, in specific implementation, a graphical programming tool can be used to color-code the virtual piano keys as blue, green, or red on the host computer. When the third section is touched with light pressure, the audio of Mi is played at a low volume, and the corresponding virtual piano key Mi turns blue. When medium and heavy pressures are respectively applied to the La and Ti sections, the tactile sensor transmits accurate tactile information and plays the La and Ti tones at medium and high volumes. This seamless integration of position and pressure on the tactile interface opens up new dimensions of user interaction and creative expression.

[0058] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made therein without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure-tactile sensor based on a common electrode structure, characterized in that, The pressure-tactile sensor includes, from top to bottom, a first electrode layer, an air dielectric layer, a conductive layer, a second electrode hybrid pressure-sensitive layer, and a second electrode layer. The air dielectric layer is formed by setting insulating pads at the edges between the first electrode layer and the conductive layer, so that an air dielectric layer is formed at the middle position, and an output electrode layer is provided between the insulating pad on one side and the conductive layer.

2. The pressure-tactile sensor based on the common electrode structure according to claim 1, characterized in that, The conductive layer is made by coating a layer of graphite on a flexible paper with a microporous structure, and the side coated with graphite faces the first electrode layer.

3. The pressure-tactile sensor based on a common electrode structure according to claim 1 or 2, characterized in that, When the first electrode layer is externally excited, the first electrode layer comes into contact with the conductive layer, and a circuit is formed among the first electrode layer, the conductive layer, and the output electrode layer. The contact point between the first electrode layer and the conductive layer is determined by measuring the resistance value of this circuit.

4. The pressure-tactile sensor based on a common electrode structure according to claim 1 or 2, characterized in that, When the first electrode layer is externally excited, the first electrode layer and the second electrode layer serve as electrode plates, and the air dielectric layer and the hybrid pressure-sensitive layer serve as dielectric layers to form a capacitive structure. The magnitude of the external force received by the first electrode layer is determined by measuring the capacitance value between the first electrode layer and the second electrode layer.

5. The pressure-tactile sensor based on the common electrode structure according to claim 1, characterized in that, The first electrode layer and the output electrode layer are flexible electrode material films.

6. The pressure-tactile sensor based on the common electrode structure according to claim 5, wherein The first electrode layer and the output electrode layer are indium tin oxide / polyethylene terephthalate (ITO / PET), silver nanowire / polyethylene terephthalate (AgNW / PET), graphene / polyethylene naphthalate (PEN), Ecoflex / polydimethylsiloxane (PDMS), or carbon nanotube / polydimethylsiloxane (CNT / PDMS).

7. The pressure-tactile sensor based on the common electrode structure according to claim 1, characterized in that, The preparation process of the hybrid pressure-sensitive layer includes: Disperse the high dielectric constant material powder in a non-polar solution, and perform ultrasonic treatment for 1 h to achieve primary deagglomeration; Inject the polymer matrix into the dispersion liquid, and construct a homogeneous solution by mechanical stirring; Perform degassing treatment on the homogeneous solution in a vacuum drying oven for 20 minutes to eliminate micropore defects; Use a spin coating process to form a film on a glass substrate, and perform thermal curing at 90 °C for 1 h to form a hybrid pressure-sensitive layer with a thickness of 200 ± 15 μm.

8. The pressure-tactile sensor based on the common electrode structure according to claim 7, characterized in that, The mass ratio of the high dielectric constant material to the polymer matrix is 1% - 2.6%.

9. The pressure-tactile sensor based on a common electrode structure according to claim 1, wherein, The insulating pad is polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), fluorinated ethylene propylene copolymer (FEP), or ethylene-tetrafluoroethylene copolymer (ETFE) with a thickness between 2 mm and 4 mm.

10. Application of a pressure-tactile sensor based on a common electrode structure, characterized in that, Including the pressure-tactile sensor based on the common electrode structure according to any one of claims 1 to 9, prepare the surface of the first electrode of the pressure-tactile sensor into a piano key pattern, connect the first electrode layer and the output electrode layer of the pressure-tactile sensor to a KEYSIGHT digital multimeter module for resistance signal acquisition, connect the first electrode layer and the output electrode layer of the pressure-tactile sensor to an LCR digital bridge module for capacitance signal acquisition, map the piano key pattern with the resistance signal and the capacitance signal, and when it is detected that the positioning of the piano key position is triggered, map the detected resistance signal to the volume parameter corresponding to the piano key and the capacitance signal to the tone frequency parameter corresponding to the piano key.

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