A pressure calibration method, processing device, touch chip, touchpad and touch device
By deploying pressure sensors and location points on the touchpad and using area interpolation to calculate the calibration compensation coefficient, the problem of complex processes and low accuracy in existing technologies is solved, achieving more efficient pressure calibration and a better user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH
- Filing Date
- 2026-03-26
- Publication Date
- 2026-07-10
AI Technical Summary
Existing pressure calibration methods are complex, lack accuracy, and negatively impact user experience.
By deploying N pressure sensors and M position points on the touchpad, calculating the pressure value and calibration compensation coefficient for each position point, and using area interpolation for calibration, the process is simplified and accuracy is improved.
It achieves a simpler calibration process and higher computational efficiency, improving the accuracy of pressure detection and user experience.
Smart Images
Figure CN122363544A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pressure calibration technology, and more particularly to a pressure calibration method, processing device, touch chip, touch panel, and touch device. Background Technology
[0002] Compared to traditional touchpads, pressure-sensitive touchpads eliminate physical mechanical buttons, allowing buttons to be pressed across the entire surface. To maintain a consistent pressing feel, it's desirable to detect the same pressure level across different locations on the touchpad. However, due to mechanical installation errors and variations in pressure sensor sensitivity, the detected pressure level varies significantly across different locations, affecting the pressing feel. This results in some areas requiring considerable pressure to activate a button, while others only require a light touch, greatly degrading the user experience.
[0003] Existing pressure calibration methods first use a pressure weight to calibrate the sensor points, and then use the weight a second time to perform bilinear interpolation compensation calibration on multiple points across the entire screen. This method is relatively complex in the overall production process, increasing production line time and resulting in low timeliness. In addition, the pressure surface fitted by bilinear interpolation compensation calibration has a low dimension, making it difficult to closely approximate the actual pressure surface, thus affecting the accuracy of the calibration. Summary of the Invention
[0004] The purpose of this invention is to provide a pressure calibration method, processing device, touch chip, touchpad, and touch device to solve the aforementioned technical problems of complex processes and insufficient accuracy in the prior art. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.
[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a pressure calibration method applied to a touchpad, wherein the touchpad is provided with N pressure sensors and M position points, and at least one position point is set between every two pressure sensors, where N>1; the method includes the following steps: A preset pressure is sequentially applied to N pressure sensors and M location points, and pressure diff data for each pressure sensor and each location point is collected. The calibration coefficient of each pressure sensor is calculated using the diff data corresponding to the pressure sensor. The pressure calculation value for each location point is calculated based on the area of the geometric figure formed by the center points of the N pressure sensors, the area of the geometric figure formed by each location point and the center point of each pressure sensor, the calibration coefficient of each pressure sensor, and the pressure diff data. The calibration compensation coefficient for each location point is calculated based on the pressure calculation value and the applied preset pressure.
[0006] In one or more embodiments, N pressure sensors are arranged around the touch panel, the center points of the N pressure sensors form a rectangle, at least one position point is evenly arranged between the coordinates of every two horizontal center points of the pressure sensors, at least one position point is evenly arranged between the coordinates of every two vertical center points of the pressure sensors, and one position point is set at the center point of the rectangle.
[0007] In one or more embodiments, the pressure calculation value for each of the said location points is calculated using the following steps: After the preset pressure is applied to each location point, the fused pressure value corresponding to each location point is calculated based on the calibration coefficient of each pressure sensor and the pressure diff data corresponding to each pressure sensor. Calculate the initial pressure compensation coefficient for each location point based on the fusion pressure value corresponding to each location point and the preset pressure; The final pressure compensation coefficient for each location point is calculated based on the initial pressure compensation coefficient, the area of the geometric figure formed by each location point and the center point of each pressure sensor, and the area of the geometric figure formed by the center points of N pressure sensors. The pressure calculation value for each location point is calculated based on the final pressure compensation coefficient and the fusion pressure value.
[0008] In one or more embodiments, the ratio of the preset pressure applied to each location point to its calculated pressure value is used to obtain the calibration compensation coefficient for each location point.
[0009] In one or more embodiments, a calibration compensation stabilization region is provided between the pressure sensor and the location point, and between the location points.
[0010] In one or more embodiments, when the coordinate point of the press is located in any of the calibration compensation stable regions, the calibration compensation coefficient of the press coordinate is the average of the calibration compensation coefficients of the adjacent regions of the calibration compensation stable region in which it is located.
[0011] As a general inventive concept, the present invention also provides a pressure calibration processing device for pressure calibration on a touchpad, including a TP device and a pressure calibration device; The touchpad is equipped with N pressure sensors and M position points, with at least one position point between every two pressure sensors, where N>1; The TP device is used to collect pressure diff data of each pressure sensor and each location point, and to calculate the calibration coefficient of each pressure sensor using the diff data corresponding to the pressure sensor. The pressure calibration device is used to calculate the pressure compensation coefficient of each location point based on the area of the geometric figure formed by the center points of the N pressure sensors, the area of the geometric figure formed by each location point and the center point of each pressure sensor, the calibration coefficient of each pressure sensor, and the pressure diff data; and to calculate the pressure calculation value of each location point based on the pressure calculation value of each location point and the applied preset pressure.
[0012] As a general inventive concept, the present invention also provides a touch chip for pressure calibration on a touchpad, performing a pressure calibration method as described above.
[0013] As a general inventive concept, the present invention also provides a touchpad, including a touch chip as described above.
[0014] As a general inventive concept, the present invention also provides a touch device, including a touchpad as described above.
[0015] Implementing one of the above-described technical solutions of the present invention has the following advantages or beneficial effects: This method calculates the actual pressure value at each point on the touchpad using area interpolation and compares it with the expected pressure to calculate the calibration compensation coefficient for each point. This method has a simpler structure and higher calibration and calculation efficiency. It can be applied to touch devices such as laptops, leather keyboards, touch mice, and game controllers. Its calibration process is simpler, the pressure calculation is more suitable for MCUs, and it provides better pressure consistency across the entire screen, improving the user experience. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1This is a flowchart of a pressure calibration method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a touchpad with 9 calibration position points arranged according to an embodiment of the present invention; Figure 3 This is a schematic diagram of setting a calibration compensation stable region based on the calibration location point according to an embodiment of the present invention.
[0017] Figure 4 This is a structural block diagram of a pressure calibration processing device according to an embodiment of the present invention. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, various exemplary embodiments described below will be referenced to the accompanying drawings, which form part of the exemplary embodiments, illustrating various exemplary embodiments that may be used to implement the present invention. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. It should be understood that they are merely examples of processes, methods, and apparatuses consistent with some aspects of the present invention disclosed as detailed in the appended claims, and other embodiments may be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and spirit of the present invention.
[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the referred element must have a specific orientation, or be constructed and operated in a specific orientation. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. The term "multiple" means two or more. The terms "connected" and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, communication connections, direct connections, indirect connections through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more of the related listed items. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0020] To illustrate the technical solution described in this invention, specific embodiments are described below, showing only the parts related to the embodiments of this invention.
[0021] Example 1: like Figure 1As shown, the present invention provides a pressure calibration method applied to a touch panel. The touch panel is provided with N pressure sensors and M position points. At least one position point is set between every two pressure sensors, N>1, and the center point of the N pressure sensors and the M position points constitute N+M calibration position points.
[0022] In one or more embodiments, N pressure sensors are arranged around the touchpad, and the center points of the N pressure sensors form a rectangle. At least one position point is uniformly arranged between the horizontal center points of every two pressure sensors, and at least one position point is uniformly arranged between the vertical center points of every two pressure sensors. One position point is set at the center point of the rectangle.
[0023] like Figure 2 As shown, in a specific example, four pressure sensors (N=4) and five location points (M=5) are used, totaling nine calibration location points. Four pressure sensors are located at the corners of the nine calibration location points, while the others are evenly distributed across the touch panel. In the figure, points 1 to 9 are calibration location points. Points 1, 3, 7, and 9 are the center points of the pressure sensors. Location point 2 is the midpoint between pressure sensor center points 1 and 3. Location point 4 is the midpoint between pressure sensor center points 1 and 7. Location point 5 is the center point of the touch panel. Location point 6 is the midpoint between pressure sensor center points 3 and 9. Location point 8 is the midpoint between pressure sensor center points 7 and 9.
[0024] Furthermore, a pressure calibration method includes the following steps: S100: Apply preset pressure sequentially to N pressure sensors and M location points, and collect pressure diff data for each pressure sensor and each location point.
[0025] In this embodiment, a preset pressure weight of 200g can be used to press the pressure sensors and position points sequentially according to their corresponding numbers. This method only requires pressing each pressure sensor and position point once with the weight, thus greatly simplifying the process and improving efficiency.
[0026] In this embodiment, a TP (TouchPad) chip can be used to collect pressure diff data from pressure sensors and location points.
[0027] The aforementioned diff data is calculated by subtracting the raw data without touch from the raw data under pressure (unprocessed raw data). In this embodiment, the diff value reflects the magnitude of the pressure and is used to calibrate each pressure sensor. After calibration, the pressure value detected by the touchpad after the desired pressure is applied can be calculated.
[0028] Furthermore, the calculation of diff is a conventional calculation without differential calculation. As for how to calculate diff, for example, when a pressure weight is pressed on calibration point 1 (calibration position point), the four pressure sensors will sense the pressure change. The TP chip detects the magnitude of the change, which is the diff value. Pressing the pressure at each calibration point will cause the four pressure sensors to change, and the TP chip can obtain a set of diff data. For example, when a 200g weight is pressed on calibration position 1, the TP detects the four pressure sensors and obtains a set of diff data: diff[1][1], diff[1][2], diff[1][3], diff[1][4]. After pressing all calibration points, the calibration coefficients of the pressure sensors and the compensation coefficients of each calibration position will be calculated. The calibration coefficients of each pressure sensor can be calculated using the four sets of data from calibration points 1, 3, 7, and 9; and then the compensation coefficients are calculated based on the diff data set of each calibration point and the sensor calibration coefficients obtained in the previous step.
[0029] S200: Calculate the calibration coefficient for each pressure sensor using the diff data corresponding to the pressure sensor.
[0030] It is understandable that the calibration coefficients k1, k3, k7, and k9 for the four pressure sensors corresponding to calibration points 1, 3, 7, and 9, respectively, can be calculated using TP. Specifically, The equations were obtained by calibrating positions 1, 3, 7, and 9, and are as follows: 200g = k1 diff[1][1]+k3 diff[1][3]+k7 diff[1][7]+k9 diff[1][9]; 200g = k1 diff[3][1]+k3 diff[3][3]+k7 diff[3][7]+k9 diff[3][9]; 200g = k1 diff[7][1]+k3 diff[7][3]+k7 diff[7][7]+k9 diff[7][9]; 200g = k1 diff[9][1]+k3 diff[9][3]+k7 diff[9][7]+k9 diff[9][9]; If calibration points 1, 3, 7, and 9 are directly above the pressure sensor location, then the diff values at the other three points will be negligible, and the equation can be simplified to: 200g = k1 diff[1][1]; 200g = k3 diff[3][3]; 200g = k7 diff[7][7]; 200g = k9 diff[9][9]; This makes it easy to calculate the calibration coefficient for each pressure sensor.
[0031] S300: Based on the area of the geometric figure formed by the center points of N pressure sensors, the area of the geometric figure formed by each position point and the center point of each pressure sensor, the calibration coefficient of each pressure sensor, and the collected pressure diff data, calculate the pressure value at each position point.
[0032] In one or more embodiments, the pressure value at each location point is calculated using the following steps: After a preset pressure is applied to each location point, the fused pressure value for each location point is calculated based on the calibration coefficient of each pressure sensor and the pressure diff data corresponding to each pressure sensor.
[0033] In a specific embodiment, this step corresponds to the fusion pressure value at the m-th location. The calculation formula is: ; in, This represents the calibration coefficient corresponding to the nth pressure sensor. This is the pressure diff data of the nth pressure sensor corresponding to the mth location point after the preset pressure is applied.
[0034] Calculate the initial pressure compensation coefficient for each location point based on the fusion pressure value and the preset pressure.
[0035] In a specific embodiment, the initial pressure compensation coefficient at the m-th location point Calculate using the following formula: ; in, Set the preset pressure, such as 200g.
[0036] The final pressure compensation coefficient for each location point is calculated based on the initial pressure compensation coefficient for each location point, the area of the geometric figure formed by each location point and the center point of each pressure sensor, and the area of the geometric figure formed by the center points of N pressure sensors.
[0037] In a specific embodiment, the final pressure compensation coefficient at the m-th location point Calculate using the following formula: ; in, Let be the area of the geometric figure formed by the m-th position point and the center point of the n-th pressure sensor. Let this be the area of the geometric shape formed by the center points of the N pressure sensors. Further, taking the 5th position point as an example... ; ; ; ; .
[0038] It should be noted that if a location point forms a straight line with the center point of the pressure sensor in the horizontal or vertical direction, such as location point 2, the area of the geometric figure formed by it, calibration location point 1 (center point of pressure sensor 1), and calibration location point 3 (center point of pressure sensor 3) is calculated using... Figure 3 The area corresponding to the calibration compensation stable region shown in the figure is set according to the actual situation, and will not be described in detail here.
[0039] Based on the final pressure compensation coefficient and the fusion pressure value, calculate the pressure value at each location point.
[0040] In a specific embodiment, the pressure value at the m-th location point is calculated. Calculate using the following formula: ).
[0041] S400: Calculate the calibration compensation coefficient for each location point based on the pressure compensation coefficient for each location point and the applied preset pressure.
[0042] In this embodiment, the calibration compensation coefficient for the m-th position is obtained by comparing the preset pressure applied at the m-th position with its pressure compensation coefficient. 。
[0043] like Figure 3As shown, calibration compensation stabilization regions are set between the pressure sensor and the position point, and between the position points themselves. When the coordinate point of the press is located within any calibration compensation stabilization region, the calibration compensation coefficient of the press coordinate is the average of the calibration compensation coefficients of the adjacent regions within that region.
[0044] Understandably, the purpose of setting a calibration compensation stable region is to use the average of the calibration compensation coefficients of adjacent sub-regions when the coordinate point is located in the stable region. This ensures that when the pressure applied by the finger in the region is the same, the pressure value calculated by the finger movement will not change abruptly, resulting in a more uniform and smooth motion.
[0045] In summary, this embodiment distributes N pressure sensors at the four corners of the touchpad and uses an N-point area interpolation method for calibration. First, the desired calibration pressure (preset pressure) is applied directly above the N sensors to obtain the corresponding pressure diff values and the calibration values for the sensors corresponding to the desired pressure. Then, M test points are distributed in the middle of the N points, and the desired calibration pressure is applied to each point. The area interpolation calibration method is used to obtain the calibration parameters k of the M test points with respect to the N sensors, thus enabling full-screen calibration of the desired pressure. When calculating the pressure at each point on the touchpad, the actual pressure value at each point is calculated using the area interpolation method and compared with the desired pressure to calculate the calibration compensation coefficient for each point. This method has a simpler structure and higher calibration and calculation efficiency. It can be applied to touch devices such as laptops, leather keyboards, touch mice, and game controllers.
[0046] This method offers a simpler calibration process, more suitable pressure calculations for MCUs, and better pressure consistency across the entire screen, thus improving the user experience.
[0047] Example 2: As shown in Figure 4, this embodiment provides a pressure calibration processing device for pressure calibration on a touchpad, including a TP device and a pressure calibration device; The touchpad is equipped with N pressure sensors and M position points, with at least one position point between every two pressure sensors, where N>1. The touchpad structure is consistent with that in Embodiment 1, as detailed in Embodiment 1.
[0048] The TP device is used to collect pressure diff data from each pressure sensor and each location point, and to calculate the calibration coefficient of each pressure sensor using the diff data corresponding to the pressure sensor. The pressure calibration device is used to calculate the pressure compensation coefficient for each location point based on the area of the geometric figure formed by the center points of N pressure sensors, the area of the geometric figure formed by each location point and the center point of each pressure sensor, the calibration coefficient of each pressure sensor, and the pressure diff data; and to calculate the pressure calculation value for each location point based on the pressure calculation value for each location point and the applied preset pressure.
[0049] For specific implementation methods of the aforementioned TP equipment and pressure calibration equipment, please refer to Embodiment 1.
[0050] It is understood that pressure calibration equipment is not limited to processing devices containing configuration modules and parsing modules, computer-readable storage media, or processing devices including one or more processors and memories.
[0051] In this embodiment, N pressure sensors are distributed at the four corners of the touchpad. Calibration is performed using an N-point area interpolation method. First, the desired calibration pressure (preset pressure) is applied directly above the N sensors to obtain the corresponding pressure diff value and the calibration value for each sensor corresponding to the desired pressure. Then, M test points are distributed in the middle of the N points, and the desired calibration pressure is applied to each point. The area interpolation calibration method is used to obtain the calibration parameter k of the M test points with respect to the N sensors. This allows for full-screen calibration of the desired pressure. When calculating the pressure at each point on the touchpad, the actual pressure value at each point is calculated using area interpolation and compared with the desired pressure to calculate the calibration compensation coefficient for each point. This method has a simpler structure and higher calibration and calculation efficiency. It can be applied to touch devices such as laptops, leather keyboards, touch mice, and game controllers.
[0052] This pressure calibration processing device has a simpler structure, the pressure calculation is more suitable for MCUs, and the pressure consistency across the entire screen is better, improving the user experience.
[0053] Example 3: This embodiment also provides a touch chip for pressure calibration on a touchpad, performing a pressure calibration method as described in Embodiment 1.
[0054] It is understood that the touch chip is embedded with a module or computer program corresponding to the pressure calibration method described in Embodiment 1, which can improve the accuracy and computational efficiency of touchpad pressure calibration.
[0055] Example 4: This embodiment also provides a touchpad, including a touch chip as described in Embodiment 3.
[0056] In a specific embodiment, four pressure sensors are distributed at the four corners of the touchpad. Calibration is performed using a four-point area interpolation method. First, the desired calibration pressure is applied directly above the four sensors to obtain the corresponding pressure diff values, and the calibration values for each node corresponding to the desired pressure are obtained. Then, five test points are distributed in the middle of the four points, and the desired calibration pressure is applied to each point. The area interpolation calibration method is used to obtain the calibration parameter k of that point relative to the original four points, thus achieving desired pressure calibration at nine points across the entire screen. When calculating the pressure at a point on the touchpad, the area interpolation method is used to calculate the actual pressure value at each point, and it is compared with the desired pressure to calculate the calibration compensation coefficient for each point. The touch chip embeds the pressure calibration method described in Embodiment 1, which has high calibration accuracy and high computational efficiency.
[0057] Example 5: This embodiment also provides a touch device, including a touchpad as described in Embodiment 4.
[0058] Touchscreen devices include laptops, leather keyboards, touch mice, and game controllers.
[0059] Those skilled in the art will understand that all or part of the features / steps of the above-described method embodiments can be implemented by methods, data processing systems, or computer programs. These features may be implemented without hardware, entirely in software, or in a combination of hardware and software. The software includes computer programs that can be stored in one or more computer-readable storage media. When the computer program is executed (e.g., by a processor), it performs the steps of one of the pressure calibration method embodiments described above.
[0060] The aforementioned storage media include: static disks, solid-state drives, random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), optical storage devices, magnetic storage devices, flash memory, magnetic disks or optical disks and / or combinations thereof, that is, they can be implemented by any type of volatile or non-volatile storage devices or combinations thereof.
[0061] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.
[0062] The above description is merely a preferred embodiment of the present invention. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.
Claims
1. A pressure calibration method applied to a touchpad, characterized in that, The touchpad is equipped with N pressure sensors and M position points, with at least one position point positioned between every two pressure sensors, where N>1; the method includes the following steps: A preset pressure is sequentially applied to N pressure sensors and M location points, and pressure diff data for each pressure sensor and each location point is collected. The calibration coefficient of each pressure sensor is calculated using the diff data corresponding to the pressure sensor. The pressure calculation value for each location point is calculated based on the area of the geometric figure formed by the center points of the N pressure sensors, the area of the geometric figure formed by each location point and the center point of each pressure sensor, the calibration coefficient of each pressure sensor, and the collected pressure diff data. The calibration compensation coefficient for each location point is calculated based on the pressure calculation value and the applied preset pressure.
2. The pressure calibration method according to claim 1, characterized in that, N pressure sensors are arranged around the touch panel. The center points of the N pressure sensors form a rectangle. At least one position point is evenly arranged between the horizontal center points of every two pressure sensors. At least one position point is evenly arranged between the vertical center points of every two pressure sensors. One position point is set at the center point of the rectangle.
3. The pressure calibration method according to claim 1, characterized in that, The pressure value at each location point is calculated using the following steps: After the preset pressure is applied to each location point, the fused pressure value corresponding to each location point is calculated based on the calibration coefficient of each pressure sensor and the pressure diff data corresponding to each pressure sensor. Calculate the initial pressure compensation coefficient for each location point based on the fusion pressure value corresponding to each location point and the preset pressure; The final pressure compensation coefficient for each location point is calculated based on the initial pressure compensation coefficient, the area of the geometric figure formed by each location point and the center point of each pressure sensor, and the area of the geometric figure formed by the center points of N pressure sensors. The pressure calculation value for each location point is calculated based on the final pressure compensation coefficient and the fusion pressure value.
4. The pressure calibration method according to claim 1, characterized in that, The calibration compensation coefficient for each location point is obtained by comparing the preset pressure applied at each location point with its calculated pressure value.
5. The pressure calibration method according to claim 1, characterized in that, A calibration compensation stabilization region is set between the pressure sensor and the location point, and between the location points themselves.
6. The pressure calibration method according to claim 5, characterized in that, When the coordinate point of the press is located in any of the calibration compensation stable regions, the calibration compensation coefficient of the press coordinate is the average of the calibration compensation coefficients of the adjacent regions of the calibration compensation stable region.
7. A pressure calibration processing device, characterized in that, Pressure calibration applied to touchpads, including TP devices and pressure calibration devices; The touchpad is equipped with N pressure sensors and M position points, with at least one position point between every two pressure sensors, where N>1; The TP device is used to collect pressure diff data of each pressure sensor and each location point, and to calculate the calibration coefficient of each pressure sensor using the diff data corresponding to the pressure sensor. The pressure calibration device is used to calculate the pressure compensation coefficient of each location point based on the area of the geometric figure formed by the center points of the N pressure sensors, the area of the geometric figure formed by each location point and the center point of each pressure sensor, the calibration coefficient of each pressure sensor, and the pressure diff data; and to calculate the pressure calculation value of each location point based on the pressure calculation value of each location point and the applied preset pressure.
8. A touch chip, characterized in that, Pressure calibration applied to a touchpad, performing a pressure calibration method as described in any one of claims 1-6.
9. A touchpad, characterized in that, Including a touch chip as described in claim 8.
10. A touch device, characterized in that, Including a touchpad as described in claim 9.