Method and apparatus for implementing touchpad pressure detection based on dual sensors

Abstract

The application relates to the technical field of touchpad pressure detection, and discloses a method and device for realizing touchpad pressure detection based on double sensors, the method comprising the following steps: placing two groups of sensors on the two sides of a touchpad, and dividing the touchpad into regions; detecting the touchpad pressure through the two groups of sensors respectively, adjusting the detection results according to the regions where the touch points are located, and obtaining two groups of pressure sensing data; comparing the two groups of pressure sensing data, dynamically adjusting the weights of the two groups of pressure sensing data according to the comparison result, and obtaining a final pressure detection result. The application can comprehensively judge by combining the detection results of the double sensors, improve the accuracy of the detection result, simultaneously detect each region of the touchpad through the double sensors, dynamically adjust the weights of the two groups of pressure sensing data through comparison and analysis, achieve higher pressure detection accuracy, and the two groups of sensors are more conducive to being arranged on the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of touchpad pressure detection, and in particular to a method and device for realizing touchpad pressure detection based on double sensors. BACKGROUND

[0002] A touchpad is an important input device of many electronic devices, which can obtain position information through a finger or a touchpad supporting device. With the diversification of the functional requirements of electronic devices, the pressure information of the pressing process obtained through the touchpad can realize more diverse functions. For example, for a digital tablet for drawing, the real-time detection of the size of the brush pressure can effectively control the brush touch, thereby achieving a better simulation effect.

[0003] The existing touchpad pressure detection can be realized in various ways. For example, through conductive silicone deformation detection, conductive silicone and electrodes are arranged inside the touchpad. When a user presses, the deformation of the silicone causes the contact area with the electrodes to change. The contact area is inversely proportional to the resistance value. The pressure value is derived by measuring the resistance change, and the touch feedback instruction is generated by combining the data conversion model, thereby obtaining the pressure detection data. Or through a piezoelectric sensor, using the principle that some crystal materials will generate an electric charge inside when subjected to mechanical pressure, and then judging the pressure by the voltage size.

[0004] When the existing touchpad uses a piezoelectric sensor to detect touch pressure, the arrangement of a single piezoelectric sensor will cause errors in the detection data due to the distance between the touch point and the sensor. On the other hand, using too many sensors will increase the cost of touchpad layout and affect the structure layout. Therefore, how to improve the accuracy of touchpad pressure detection with fewer piezoelectric sensors is the fundamental problem to be solved by the present application. SUMMARY

[0005] In order to improve the accuracy of touchpad pressure detection with fewer piezoelectric sensors, the present application provides a method and device for realizing touchpad pressure detection based on double sensors.

[0006] In the first aspect, the present application provides a method for realizing touchpad pressure detection based on double sensors, which adopts the following technical solution:

[0007] The method for realizing touchpad pressure detection based on double sensors comprises the following steps:

[0008] Placing two groups of sensors on both sides of the touchpad to divide the touchpad into regions;

[0009] Detecting the pressure of the touchpad by the two groups of sensors respectively, and adjusting the detection results according to the region where the touch point is located to obtain two groups of pressure sensing data;

[0010] The two sets of pressure sensing data are compared, and the weights of the two sets of pressure sensing data are dynamically adjusted based on the comparison results to obtain the final pressure detection result.

[0011] By adopting the above technical solution, the detection results of dual sensors can be combined for comprehensive judgment, improving the accuracy of the detection results. Compared with the method of multiple sets of sensors detecting corresponding areas separately, dual sensors simultaneously detect various areas of the touchpad. Through comparative analysis, the weight of the two sets of pressure sensing data is dynamically adjusted, achieving higher pressure detection accuracy. At the same time, the two sets of sensors are more conducive to their use and placement on the device. The process of adjusting the detection results according to the area where the touch point is located is based on the accuracy of the pressure detection results in different areas during the area division process. Adjustment values ​​are obtained for different areas, and the detection results are adjusted by adjusting the adjustment values. The resulting pressure sensing data can better reflect the real pressure data in the actual use of the touchpad, thereby improving the accuracy of the final result.

[0012] Optionally, the process of comparing the two sets of pressure sensor data includes:

[0013] Obtain the real-time pressure difference between two sets of pressure sensor data, and compare the real-time pressure difference with a preset pressure threshold range [F1, F2].

[0014] If the real-time pressure difference is less than F1, the two sets of pressure sensing data are adjusted according to a 1:1 weight ratio to obtain the final pressure detection result.

[0015] If the real-time pressure difference ∈ [F1, F2], then the two sets of pressure sensing data are adjusted according to the distance between the contact area and the two sets of pressure sensing data. The weight ratio of the first pressure sensor and the second pressure sensor is: , The distance between the contact area and the first pressure sensor. The distance between the contact area and the second pressure sensor is denoted by f, which is a lookup table function.

[0016] If the real-time pressure difference is greater than F2, then the anomaly detection strategy will be executed.

[0017] By adopting the above technical solution and adjusting the weight ratio, the two sets of pressure sensing data can be adaptively adjusted, reducing the impact of the error between the two sets of pressure sensing data on the final detection result and improving the accuracy of pressure detection. When there is abnormal data in the two sets of pressure sensing data, the abnormality detection strategy is executed to judge the abnormality, identify the abnormal pressure sensing data, and thus obtain an accurate final detection result.

[0018] Optionally, the anomaly detection strategy includes:

[0019] Acquire the voltage change curves of each group of sensors and select a time window T to obtain the voltage peak value within the time window T for each group of sensors. and the cumulative energy value E, where, , Let N be the sampling interval, and N be the number of sampling intervals. j is a positive integer and j∈[1,N], Let be the average voltage value of the j-th sampling interval;

[0020] The peak voltage of the two sets of sensors The cumulative energy value E of the two sets of sensors is compared with the preset voltage threshold V1.

[0021] If one of the sensor sets appears If one or more of the following conditions are met (e > E1), the weight of the pressure sensing data corresponding to that group of sensors is adjusted to zero.

[0022] If both sets of sensors show If one or more of the following conditions are met (E > E1), the touchpad function will be paused and a reminder will be issued;

[0023] If both sets of sensors simultaneously satisfy When E≤E1, the combined peak voltage is... It is compared with the preset voltage threshold V1.

[0024] By adopting the above technical solution, the signal glitches caused by high-frequency vibration or electromagnetic interference are detected by the voltage peak detection result, the cumulative pressure within the time window is judged by the cumulative energy value, and the influence of abnormal detection results on the final pressure detection result is eliminated through the comparison process. The two sets of pressure detection results are adjusted by adjusting the weights, so that the final detection result can better reflect the true force state of the touchpad.

[0025] Optionally, when both sets of sensors simultaneously meet the requirements... When E≤E1, the combined peak voltage The process of comparing the voltage with the preset voltage threshold V1 includes:

[0026] Through formula Calculate and obtain the state coefficients The mean state coefficient obtained based on valid historical data ;

[0027] Two sets of sensors The pressure sensor data weight corresponding to the maximum value is adjusted to zero to obtain the final pressure detection result.

[0028] By adopting the technical scheme, the two groups of sensors can simultaneously meet When E and E are less than or equal to E1, the adjustment process of the weight and the feedback process of the exception are realized, the two groups of pressure detection results are adjusted through the adjusted weight, and the final detection result obtained is more capable of reflecting the real force state of the touch panel.

[0029] Optionally, the method further comprises:

[0030] The overall analysis is performed according to the historical pressure sensing data before the current time point, the sensor running stability is judged according to the overall analysis result, and the next detection process is adjusted according to the judgment result.

[0031] By adopting the technical scheme, the sensor is analyzed for stability according to the historical pressure sensing data, the running state is judged, and the performance of the sensor is judged.

[0032] Optionally, the process of judging the sensor running stability according to the overall analysis result comprises:

[0033] The real-time pressure difference value p in the historical continuous data is obtained, the pressure difference value standard deviation s of the real-time pressure difference value p is calculated, and the pressure difference value standard deviation s is compared with the preset threshold st:

[0034] If s is less than or equal to st, it is judged that the sensor running stability is normal, and the next detection process is not adjusted;

[0035] If s is greater than st, it is judged that the sensor running stability is abnormal, and the next detection process is adjusted according to the judgment result.

[0036] By adopting the technical scheme, the running stability of the sensor is judged according to the standard deviation s of the real-time pressure difference value in the historical continuous data, and the next detection process is adjusted according to the judgment result when the running stability of the sensor is judged to be abnormal, so that the sensor exception can be judged in time, and the accuracy of the final detection result is ensured.

[0037] Optionally, when s is greater than st, the process of adjusting the next detection process comprises:

[0038] The lower limit value F2 of the preset pressure threshold interval is adjusted to F2+D , wherein, is an adjustment amount lookup table function.

[0039] By adopting the technical scheme, when there is an unstable factor in the pressure detection process, the triggering condition of the abnormal detection strategy is reduced through adjustment of the F2 value, that is, timely abnormal detection of the sensor is realized when the sensor is unstable, and the accuracy of the final detection result is ensured.

[0040] In a second aspect, the application provides a device for realizing touchpad pressure detection based on double sensors, which adopts the following technical scheme:

[0041] The device for realizing touchpad pressure detection based on double sensors is used to execute the method for realizing touchpad pressure detection based on double sensors according to any one of the preceding aspects.

[0042] By adopting the technical scheme, the detection result accuracy can be improved through comprehensive judgment of the detection results of the double sensors, and compared with the mode in which a plurality of groups of sensors detect corresponding regions respectively, the two groups of sensors are more conducive to their arrangement on the equipment while achieving high pressure detection accuracy through simultaneous detection of each region of the touchpad by the double sensors, dynamic adjustment of the weight of the two groups of pressure sensing data through comparison and analysis, and adjustment of the detection result according to the region where the touch point is located, which is based on the accuracy of the test pressure detection result of different regions in the region division process, obtaining the adjustment value of different regions, adjusting the detection result through the adjustment value, and then obtaining pressure sensing data that can better reflect the real pressure data in the actual use process of the touchpad, and further improving the accuracy of the final result.

[0043] In summary, the application has at least one of the following beneficial technical effects:

[0044] Firstly, the application can improve the accuracy of the detection result through comprehensive judgment of the detection results of the double sensors, and compared with the mode in which a plurality of groups of sensors detect corresponding regions respectively, the two groups of sensors are more conducive to their arrangement on the equipment while achieving high pressure detection accuracy through simultaneous detection of each region of the touchpad by the double sensors, dynamic adjustment of the weight of the two groups of pressure sensing data through comparison and analysis, and adjustment of the detection result according to the region where the touch point is located, which is based on the accuracy of the test pressure detection result of different regions in the region division process, obtaining the adjustment value of different regions, adjusting the detection result through the adjustment value, and then obtaining pressure sensing data that can better reflect the real pressure data in the actual use process of the touchpad, and further improving the accuracy of the final result.

[0045] Secondly, the application can adaptively adjust two groups of pressure sensing data by adjusting the weight ratio, reduce the influence of the error between the two groups of pressure sensing data on the final detection result, and improve the accuracy of pressure detection; when there is abnormal data in the two groups of pressure sensing data, the abnormal detection strategy is executed to judge the existence of the abnormal data, determine the pressure sensing data with the abnormal data, and then obtain the accurate final detection result.

[0046] Thirdly, when there is an unstable factor in the pressure detection process, the application reduces the triggering condition of the abnormal detection strategy by adjusting the F2 value, that is, the abnormal detection of the sensor is realized in time when the sensor is unstable, and the accuracy of the final detection result is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a step flow chart of a touchpad pressure detection method based on double sensors;

[0048] Figure 2 is a layout diagram of a sensor in an embodiment;

[0049] Figure 3 is a layout diagram of a sensor in another embodiment;

[0050] Figure 4 is a schematic diagram of the overall structure of a touchpad in an embodiment. DETAILED DESCRIPTION

[0051] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings.

[0052] In the description of the present specification, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the described embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The embodiments of the present application disclose a method for detecting the pressure of a touchpad based on double sensors, referring to Figure 1The method comprises the following steps: placing two groups of sensors on two sides of the touchpad, dividing the touchpad into regions; detecting the pressure of the touchpad by the two groups of sensors respectively, adjusting the detection results according to the region where the touch point is located, and obtaining two groups of pressure sensing data; comparing the two groups of pressure sensing data, dynamically adjusting the weight of the two groups of pressure sensing data according to the comparison result, and obtaining the final pressure detection result. In the embodiment, the two sensors are placed on the two sides of the touchpad, and the position points of the sensors are set on the upper and lower sides Figure 2 The position points of the sensors can be set on the left and right diagonal positions Figure 3 The position points of the sensors can be set on the left and right diagonal positions Figure 4 The touchpad is composed of a touch panel, a silica gel pad, a PCB, a structural steel sheet, a mounting base and a mounting screw. Pressing the touch panel on the surface of the touchpad will cause the six metal springs to be pressed down through the silica gel pad, and then the root of the spring will be deformed. The two groups of sensors will detect the deformation of the spring, and then calculate the pressure by combining the position of the finger pressing. Compared with the single sensor detecting the pressure of the touchpad, the double sensors can combine the results of the two to improve the accuracy of the detection results. At the same time, compared with the method of detecting the corresponding region by a plurality of groups of sensors, the detection method of the embodiment detects each region of the touchpad by the double sensors at the same time. By comparison and analysis, the weight of the two groups of pressure sensing data is dynamically adjusted, so that the two groups of sensors are more suitable for the arrangement on the equipment. In addition, in the above-mentioned scheme, the process of adjusting the detection result according to the region where the touch point is located is to obtain the adjustment value of different regions according to the accuracy of the test pressure detection result in the region division process. The detection result is adjusted by the adjustment value, and then the pressure sensing data obtained can better reflect the real pressure data in the actual use process of the touchpad, thereby improving the accuracy of the final result.

[0054] In one embodiment, the process of comparing the two sets of pressure sensing data includes: first, obtaining the real-time pressure difference between the two sets of pressure sensing data; when the real-time pressure difference between the two sets of pressure sensing data is low, it means that the detection results of the two sets of sensors are consistent; otherwise, when the real-time pressure difference between the two sets of pressure sensing data is too high, it means that there is an abnormal detection result in the two sets of sensors. In this embodiment, the real-time pressure difference is compared with the preset pressure threshold interval [F1, F2]. The preset pressure threshold interval [F1, F2] is set according to empirical data. When the real-time pressure difference is less than F1, it means that the detection results of the two sets of sensors are consistent, and then the two sets of pressure sensing data are adjusted according to the weight ratio of 1:1 to obtain a more accurate final pressure detection result. When the real-time pressure difference is ∈ [F1, F2], it means that there is a certain error in the two sets of sensors. In order to improve the accuracy of the final detection result, the distance between the contact area and the two sets of pressure sensing data is adjusted, and the weight ratio of the first pressure sensor and the second pressure sensor is adjusted to wherein is the distance between the contact area and the first pressure sensor, is the distance between the contact area and the second pressure sensor, and f is a lookup table function. The lookup table function f sets the corresponding weight value according to the accuracy data in different distance ranges from the sensor. The closer the distance, the higher the corresponding weight value. Therefore, by adjusting the weight ratio, the two sets of pressure sensing data can be adaptively adjusted to reduce the influence of the error between the two sets of pressure sensing data on the final detection result and improve the accuracy of pressure detection. In addition, when the real-time pressure difference is greater than F2, it means that there is abnormal data in the two sets of pressure sensing data. Therefore, by executing an abnormal detection strategy, the abnormality is judged to determine the pressure sensing data with abnormality, and then an accurate final detection result is obtained.

[0055] In one embodiment, the abnormal detection strategy includes: obtaining the voltage change curve of each sensor and selecting a time window T. In this embodiment, T = 50 ms, the voltage peak value and the energy cumulative value E within the time window T of each sensor are obtained, wherein , is the sampling interval, the number of N-bit sampling intervals, and j is a positive integer and j ∈ [1, N], is the voltage average of the jth sampling interval. Since the abnormal detection result of the piezoelectric sensor is mainly caused by interference, this embodiment obtains the voltage peak value and the energy cumulative value E within the time window T of each sensor, and the voltage peak value To determine whether the test results are affected by high-frequency vibration or electromagnetic interference causing signal glitches, the cumulative pressure within the time window is judged by the cumulative energy value E. Then, the voltage peak values ​​of the two sets of sensors are compared. The cumulative energy value E of the two sets of sensors is compared with the preset voltage threshold V1. If one of the sensors shows an abnormal voltage threshold V1, the cumulative energy value E is compared with the preset energy threshold E1. If one or more of the following conditions are met (E > E1), the weight of the pressure sensing data corresponding to that set of sensors is adjusted to zero, meaning that another set of pressure sensing data is selected as the final result, eliminating the influence of abnormal detection results on the final pressure detection result; if both sets of sensors show abnormalities... If one or more of the following conditions are met (E > E1), it indicates that both sets of sensor data are abnormal, suggesting a potential hardware failure risk. Therefore, the touchpad function is paused and a warning is issued. If both sets of sensors simultaneously meet the following conditions... When E≤E1, the combined peak voltage is... The comparison with the preset voltage threshold V1 is performed, and the specific process includes: using the formula Calculate and obtain the state coefficients When the sensor is disturbed, its voltage peak is prone to large fluctuations. Therefore, the state coefficient is obtained by comparing its voltage peak value with the cumulative energy value E. When the state coefficient When the historical average data is larger, the risk of anomalies in the corresponding results is also greater. Therefore, the mean state coefficient obtained based on valid historical data is crucial. Two sets of sensors The weight of the pressure sensing data corresponding to the maximum value is adjusted to zero, and the two sets of sensors are... The pressure sensing data corresponding to the minimum value is used as the final pressure detection result. Through the above process, it is possible to simultaneously satisfy the requirements of both sets of sensors. When E≤E1, the process of adjusting the weights and the feedback process of anomalies are realized. The two sets of pressure detection results are adjusted by adjusting the weights, and the final detection results obtained can better reflect the true force state of the touchpad.

[0056] In one embodiment, the method further includes: performing an overall analysis based on historical pressure sensing data prior to the current time point, judging the stability of sensor operation based on the overall analysis results, and adjusting the next detection process based on the judgment results. When the sensor is operating stably, the real-time pressure difference between the two sets of pressure sensing data is low and remains stable. Therefore, by performing stability analysis on the sensor using historical pressure sensing data, its operating status can be judged, thereby enabling the judgment of sensor performance.

[0057] Wherein, the process of judging the sensor running stability according to the overall analysis result includes: obtaining real-time pressure difference value p in several groups of historical continuous data, calculating pressure difference value standard deviation s of the several groups of real-time pressure difference value p, comparing the pressure difference value standard deviation s with preset threshold st, the preset threshold st is set according to empirical data fitting, if s≤st, it indicates that the data error between the two groups of sensors is relatively stable, so it is judged that the sensor running stability is normal, and no adjustment is made to the next detection process; if s>st, it indicates that the data of the two groups of sensors produces a large fluctuation, so it is judged that the sensor running stability is abnormal, and the next detection process is adjusted according to the judgment result, wherein, the process of adjusting the next detection process includes: adjusting the lower limit value F2 of the preset pressure threshold interval to Wherein, is an adjustment amount table function, which determines the corresponding adjustment amount according to s-st in different ranges according to the test data and s-st, so that when there are unstable factors in the pressure detection process, the triggering condition of the abnormal detection strategy is reduced through the adjustment of the F2 value, that is, the abnormal detection of the sensor is realized in time when the sensor is unstable, and the accuracy of the final detection result is ensured.

[0058] The embodiment of the application also discloses a device for realizing touchpad pressure detection based on double sensors, which is used to realize the method for realizing touchpad pressure detection based on double sensors as described in any one of the above. The embodiment adopts the mode of double sensors, which can improve the accuracy of the detection result by combining the results of the two sensors for comprehensive judgment compared with the single sensor for detecting the touchpad pressure, and can dynamically adjust the weight of the two groups of pressure sensor data by simultaneously detecting and comparing the analysis of each region of the touchpad by the double sensors compared with the mode of detecting the corresponding region by a plurality of groups of sensors, so that the two groups of sensors are more suitable for their arrangement on the equipment; the obtained pressure sensor data can better reflect the real pressure data in the actual use process of the touchpad, thereby improving the accuracy of the final result.

[0059] Although the embodiments of the application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A method for touchpad pressure detection based on dual sensor implementation, characterized in that, The method comprises: Placing two groups of sensors on two sides of the touchpad to divide the touchpad into regions; Detecting the pressure of the touchpad by the two groups of sensors respectively, and adjusting the detection results according to the region where the touch point is located to obtain two groups of pressure sensing data; Comparing the two groups of pressure sensing data, dynamically adjusting the weight of the two groups of pressure sensing data according to the comparison result, and obtaining the final pressure detection result; The process of comparing the two groups of pressure sensing data comprises: Obtaining the real-time pressure difference between the two groups of pressure sensing data, and comparing the real-time pressure difference with the preset pressure threshold interval [F1, F2]; If the real-time pressure difference is less than F1, adjust the two groups of pressure sensing data according to the weight ratio of 1:1 to obtain the final pressure detection result; If the real-time pressure difference ∈ [F1, F2], the two sets of pressure sensing data are adjusted according to the distance between the contact area and the two sets of pressure sensing data, and the weight ratio of the first pressure sensor and the second pressure sensor is , is the distance between the contact area and the first pressure sensor, is the distance between the contact area and the second pressure sensor, and f is a lookup table function. If the real-time pressure difference is greater than F2, execute the abnormal detection strategy.

2. The method for detecting pressure of a touchpad based on dual-sensor implementation according to claim 1, wherein, The abnormal detection strategy comprises: Obtain each group of sensor voltage change curve and select time window T, obtain the voltage peak value of each group of sensor in time window T and energy cumulative value E, wherein, , is the sampling interval, N is the number of sampling intervals, and , j is a positive integer and j ∈ [1, N], is the voltage average value of the jth sampling interval; The voltage peak values of the two groups of sensors are compared The energy accumulation values E of the two groups of sensors are compared with a preset energy threshold value E1 If one or more of the following conditions occurs in one of the groups of sensors or E > E1, then the pressure sensor data weight corresponding to that group of sensors is adjusted to zero. If one or more of the following conditions are met: E > E1, then the touchpad function is suspended and a reminder is given. If both groups of sensors satisfy and E≤E1 at the same time, then the integrated voltage peak is compared with the preset voltage threshold V1.

3. The method for detecting the pressure of a touchpad based on a dual-sensor implementation according to claim 2, wherein, When both groups of sensors satisfy and E≤E1, the integrated voltage peak The process of judging against the preset voltage threshold V1 includes: The state coefficient is calculated by the formula The state coefficient is calculated by the formula The state coefficient is calculated by the formula ; The two groups of sensors are respectively arranged on the left and right sides of the display screen The pressure sensing data corresponding to the maximum value is adjusted to zero, and the final pressure detection result is obtained.

4. The method for detecting pressure of a touchpad based on dual-sensor implementation according to claim 1, wherein, The method further comprises: Performing overall analysis on the historical pressure sensing data before the current time point, judging the running stability of the sensor according to the overall analysis result, and adjusting the next detection process according to the judgment result.

5. The method for detecting the pressure of a touchpad based on a dual-sensor implementation according to claim 4, wherein, The process of judging the running stability of the sensor according to the overall analysis result comprises: Obtaining the real-time pressure difference p in a plurality of groups of historical continuous data, calculating the pressure difference standard deviation s of a plurality of real-time pressure differences p, and comparing the pressure difference standard deviation s with the preset threshold st; If s≤st, it is judged that the running stability of the sensor is normal, and the next detection process is not adjusted; If s>st, it is judged that the running stability of the sensor is abnormal, and the next detection process is adjusted according to the judgment result.

6. The method for detecting the pressure of a touchpad based on a dual-sensor implementation according to claim 5, wherein, When s>st, the process of adjusting the next detection process comprises: adjusting a lower limit value F2 of the preset pressure threshold interval as wherein, is an adjustment amount reference table function.

7. A device for detecting touchpad pressure based on dual sensors, characterized in that, The device is used to run the method for detecting the pressure of the touchpad based on the two sensors according to any one of claims 1-6.

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