Touch panel, touch panel pressure detection method, and apparatus

Abstract

The application relates to a touchpad, a touchpad pressure detection method and equipment, which comprise a circuit board, a pressure sensor, a support and a touch controller, the support comprises a main body part and four first extension parts extending from four corners of the main body part to directions away from the main body part, a window is arranged in a middle region of the main body part, a second extension part connected with any window edge of the main body part is arranged in the window, the ends of the first extension part and the second extension part are adhered to the circuit board, and the second extension part is provided with a unique pressure sensor close to the connected window edge; the upper surface of the circuit board is provided with a touch electrode layer for sensing a touch position in response to a touch or pressing action and outputting a touch sensing signal; the pressing force generated by the pressure sensor when the touch or pressing action occurs is conducted to a cantilever beam to cause deformation and output a pressure sensing signal; and the touch controller determines a touch trajectory of a finger on the touchpad according to the touch sensing signal and determines the pressing force according to the touch trajectory and the pressure sensing signal.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of device control, and in particular, to a touchpad, a touchpad pressure detection method and a device. BACKGROUND

[0002] In modern electronic devices, a touchpad as a user input interface has been widely applied to devices such as notebook computers. With the increasing performance requirements of users on the touchpad, not only the accuracy of sensing the touch position needs to be improved, but also the production cost of the touchpad needs to be reduced. SUMMARY

[0003] The purpose of the present application is to provide a touchpad, a touchpad pressure detection method and a device, aiming to improve the efficiency and convenience of inputting text content on the display screen of a television and the like.

[0004] To achieve the above-mentioned purpose, the first aspect of the embodiments of the present disclosure provides a touchpad, comprising: a circuit board, a pressure sensor, a support and a touch controller, the circuit board and the pressure sensor are respectively electrically connected with the touch controller;

[0005] The support is arranged below the circuit board, the support comprises a main body part, and four first extension parts respectively extending from four corners of the main body part in directions away from the main body part, a middle region of the main body part is provided with a window, the window is provided with a second extension part connected with any window edge of the main body part, the end of each first extension part and the end of the second extension part are respectively adhered to the circuit board, and the second extension part is provided with a unique pressure sensor close to the connected window edge;

[0006] The upper surface of the circuit board is provided with a touch electrode layer, the touch electrode layer is used to sense a touch sensing signal in response to the action of touching or pressing the touchpad, and output the touch sensing signal to the touch controller;

[0007] The pressure sensor is used to deform when the pressing force generated when the touchpad is touched or pressed is conducted to the cantilever beam, and output a corresponding pressure sensing signal;

[0008] The touch controller is used to determine the touch trajectory of the finger on the touchpad according to the touch sensing signal received from the touch electrode layer, and determine the pressing force of the finger at each touch position on the touch trajectory according to the touch trajectory and the pressure sensing signal received from the pressure sensor.

[0009] In a possible implementation manner, the connection part of the main body part and the four first extension parts is provided with a screw column fixing point for fixing the support.

[0010] In a possible implementation, the end of each of the first extension parts and the end of the second extension part are adhered to the circuit board by silica gel pads.

[0011] In a possible implementation, the second extension part has a width and a length greater than the pressure sensor.

[0012] In a second aspect, the present disclosure provides a touchpad pressure detection method applied to the touch controller of any one of the touchpad in the first aspect, and the method comprises:

[0013] determining a touch trajectory of the finger on the touchpad according to a touch sensing signal received from the touch electrode layer;

[0014] determining a pressing force of the finger at each touch position on the touch trajectory according to the touch trajectory and a pressure sensing signal received from the pressure sensor.

[0015] In a possible implementation, the determining of the pressing force of the finger at each touch position on the touch trajectory according to the touch trajectory and the pressure sensing signal received from the pressure sensor comprises:

[0016] amplifying the pressure sensing signal sensed by the pressure sensor at a farthest touch position in the touch trajectory corresponding to a first amplification ratio relative to a position of the pressure sensor;

[0017] determining whether the amplified pressure sensing signal reaches a preset pressing force;

[0018] in a case where the amplified pressure sensing signal reaches the preset pressing force, amplifying the pressure sensing signal sensed by the pressure sensor at each touch position on the touch trajectory by the first amplification ratio to obtain the pressing force of the finger at each touch position on the touch trajectory.

[0019] In a possible implementation, the method further comprises:

[0020] in a case where the first amplified pressure sensing signal does not reach the preset pressing force, amplifying the pressure sensing signal sensed by the pressure sensor at the farthest touch position in the touch trajectory corresponding to a second amplification ratio relative to a position of the pressure sensor, wherein the second amplification ratio is greater than the first amplification ratio;

[0021] determining whether the amplified pressure sensing signal reaches the preset pressing force;

[0022] In the case that the re-amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signals sensed by the pressure sensor at each touch position are amplified by the second amplification ratio respectively to obtain the pressing force of the finger at each touch position on the touch track.

[0023] In the case that the re-amplified pressure sensing signal does not reach the preset pressing force, the step of amplifying the pressure sensing signal sensed by the pressure sensor at the farthest touch position from the position of the pressure sensor is performed according to the third amplification ratio corresponding to the farthest touch position in the touch track from the position of the pressure sensor in sequence until the re-amplified pressure sensing signal reaches the preset pressing force, and then the pressure sensing signals sensed by the pressure sensor at each touch position are amplified by the amplification ratio corresponding to the re-amplified pressure sensing signal to obtain the pressing force of the finger at each touch position on the touch track.

[0024] In a possible implementation manner, the method further includes:

[0025] In the case that the first amplified pressure sensing signal does not reach the preset pressing force, the pressure sensing signal sensed by the pressure sensor at the second farthest touch position from the position of the pressure sensor is amplified by the first amplification ratio.

[0026] It is determined whether the amplified pressure sensing signal reaches the preset pressing force.

[0027] In the case that the amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signals sensed by the pressure sensor at each touch position except the farthest touch position are amplified by the first amplification ratio respectively, and the pressure sensing signal of the second farthest touch position after amplification is taken as the pressure sensing signal of the farthest touch position to obtain the pressing force of the finger at each touch position on the touch track.

[0028] In a case that the amplified pressure sensing signal does not reach the preset pressing force, the pressure sensing signal corresponding to the farthest touch position relative to the position of the pressure sensor is amplified by the first amplification ratio in sequence, and it is determined whether the amplified pressure sensing signal reaches the preset pressing force, until the amplified pressure sensing signal reaches the preset pressing force. The pressure sensing signal sensed by the pressure sensor at each touch position except the touch position corresponding to the amplified pressure sensing signal which does not reach the preset pressing force is amplified by the first amplification ratio, and the pressure sensing signal corresponding to the touch position at which the amplified pressure sensing signal reaches the preset pressing force is amplified to obtain the pressing force of the finger at each touch position on the touch track.

[0029] In a possible implementation manner, the determining the touch track of the finger on the touch panel according to the touch sensing signal received from the touch electrode layer comprises:

[0030] Periodically, each driving electrode of the capacitive sensing point array in the touch electrode layer is sequentially sent an electric signal of a preset voltage;

[0031] According to the received electric charge amount sensed by each receiving electrode of the capacitive sensing point array in each time of the driving motor applying the electric signal in the current period and the reference electric charge amount corresponding to each driving electrode, a plurality of electric charge change amounts of each receiving electrode for each driving electrode in the current period are determined;

[0032] A three-dimensional electric charge change array is constructed according to the plurality of electric charge change amounts corresponding to each receiving electrode in different periods, the driving coordinates of each driving electrode in the capacitive sensing point array and the receiving coordinates of each receiving electrode in the capacitive sensing point array;

[0033] An axis electric charge change function is constructed along each axis direction of the three-dimensional electric charge change array, and the axis electric charge change function of each axis is fitted based on the least square method to obtain a touch electric charge change function, and the touch position of the finger on the touch panel is determined according to the touch electric charge change function.

[0034] In a third aspect of the embodiments of the present disclosure, an electronic device is provided, comprising:

[0035] A memory having a computer program stored thereon;

[0036] A processor configured to execute the computer program in the memory to implement the steps of the method in any one of the second aspect.

[0037] The present application provides a touchpad, a touchpad pressure detection method and equipment. Compared with the prior art, the following beneficial effects are achieved:

[0038] The middle region of the main body part is provided with an opening window, and the opening window is provided with a second extension part connected with any opening window edge of the main body part. The end of each first extension part and the end of the second extension part are respectively adhered to the circuit board through a silica gel pad. The second extension part is provided with a unique pressure sensor near the connected opening window edge. The opening window corner of the main body part and the connection part of the first extension part are provided with a screw column fixing point for fixing the support. In this way, compared with the prior art, the touchpad needs to be arranged with multiple pressure sensors, not only saving the space of the touchpad, but also being conducive to the heat dissipation of the touchpad and the arrangement of parts when new functions are added, improving the flexibility of the use of the touchpad space, and reducing the number of sensors used, thereby reducing the cost.

[0039] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0041] Figure 1 is a structural schematic diagram of a touchpad according to an embodiment of the specification.

[0042] Figure 2 is a flowchart of a touchpad pressure detection method according to an embodiment of the specification.

[0043] Figure 3 is a flowchart of a method for implementing step S22 in Figure 2 .

[0044] Figure 4 is a flowchart of a method for implementing step S21 in Figure 2 . DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0046] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0047] The present disclosure provides a touch panel, referring to Figure 1 As shown in the figure, it comprises a circuit board 110, a pressure sensor 120, a bracket 130 and a touch controller, the circuit board 110 and the pressure sensor 120 are respectively electrically connected with the touch controller;

[0048] The bracket 130 is arranged below the circuit board 110, the bracket 130 comprises a main body part 1301, and four first extension parts 1302 extending from four corners of the main body part 1301 respectively in a direction away from the main body part 1301, a middle region of the main body part 1301 is provided with a window, the window is provided with a second extension part 1303 connected with any window edge of the main body part 1301, the end of each first extension part 1302 and the end of the second extension part 1303 are respectively adhered to the circuit board 110, and the second extension part 1303 is provided with only one pressure sensor 120 close to the connected window edge;

[0049] Among them, the main body part 1301 is the main part of the bracket, and is the basis of the whole structure. It is located below the circuit board 110 and provides stable support. The main body part 1301 is a flat plate-shaped basic piece, which is placed directly below the circuit board 110.

[0050] The first extension part 1302 is the part extending outward from each of the four corners of the main body part 1301. These extensions enhance the connection strength and stability between the bracket and the circuit board. The main body part 1301, the four first extension parts 1302 extending from the four corners of the main body part 1301 respectively in a direction away from the main body part 1301, and the second extension part 1303 are usually integrally formed. Four "legs" extend from the four corners of the flat plate respectively, and these "legs" are the first extension parts 1302, which respectively point away from the center of the flat plate and are connected with the structure of the edge or below of the circuit board.

[0051] The opening in the middle region of the main body 1301 can reduce the weight. Example: a rectangular opening is cut in the center of the flat plate, which not only allows certain parts or components on the circuit board to pass through, but also reduces the weight of the support.

[0052] The second extension 1303 is a part extending inward from the opening edge of the main body 1301, and its end is adhered to the circuit board, while a pressure sensor 120 is installed near the opening edge. Example: there is a "small arm" extending from the edge on one side of the opening, and the end of the "small arm" not only adheres to the circuit board, but also carries the pressure sensor 120. In this way, the pressure sensor can directly sense the pressure change transmitted through the circuit board or the support.

[0053] The only pressure sensor 120 is installed on the second extension 1303 near the edge connected to the opening. This allows the sensor to accurately measure the pressure transmitted to the circuit board through the support without the need to configure multiple pressure sensors at the end of each extension, which not only saves cost but also saves space. The pressure sensor 120 is used to detect, convert and output pressure signals, which can be used for various control, monitoring or protection operations.

[0054] The upper surface of the circuit board 110 is provided with a touch electrode layer, which is used to sense touch sensing signals in response to the action of touching or pressing the touchpad, and output the touch sensing signals to the touch controller;

[0055] The touch electrode layer is arranged on the upper surface of the circuit board 110, which is the direct interface between the touchpad and the user's finger. The touch electrode layer can sense and generate touch sensing signals in response to the action of touching or pressing the touchpad with a finger. The touch electrode layer is usually composed of a plurality of tiny electrodes that can detect the change in capacitance when the finger contacts the touchpad. When the finger approaches or contacts the touchpad, the electric field distribution between the electrodes will change, resulting in measurable signal changes. The touch electrode layer transmits the sensed touch sensing signals to the touch controller for processing.

[0056] The pressure sensor 120 is used to deform when the pressing force generated by touching or pressing the touchpad is conducted to the cantilever beam, and output the corresponding pressure sensing signal;

[0057] The pressure sensor 120 is installed on the second extension 1303 of the support 130, near the touchpad but not in direct contact with the finger. Its main function is to detect the pressing force conducted through the first extension 1302 or the second extension 1303, and output the corresponding pressure sensing signal when it deforms.

[0058] When a finger presses the touchpad, the pressing force is transmitted to the pressure sensor 120 through the first extension 1302 or the second extension 1303. The sensitive element (such as piezoresistive material, piezoelectric crystal, etc.) inside the pressure sensor will physically deform when subjected to pressure, and this deformation will lead to changes in electrical properties (such as changes in resistance, capacitance, or voltage), thereby generating a measurable pressure sensing signal. The pressure sensor 120 transmits the sensed pressure sensing signal to the touch controller for processing.

[0059] The touch controller is configured to determine the touch trajectory of the finger on the touchpad based on the touch sensing signals received from the touch electrode layer, and determine the pressing force of the finger at each touch position on the touch trajectory based on the touch trajectory and the pressure sensing signals received from the pressure sensor.

[0060] The touch controller is the core component for processing touch sensing signals and pressure sensing signals. It receives touch sensing signals from the touch electrode layer and pressure sensing signals from the pressure sensor 120, and performs comprehensive analysis and processing.

[0061] First, the touch controller determines the touch trajectory of the finger on the touchpad based on the touch sensing signals. Then, it combines the touch trajectory and the corresponding pressure sensing signals to calculate the pressing force of the finger at each touch position on the touch trajectory. This combination of touch position and pressing force information can provide users with more comprehensive interactive feedback.

[0062] The above technical solution comprises four first extensions extending from the four corners of the main body part in directions away from the main body part, a middle region of the main body part is provided with an opening window, a second extension connected to any opening window edge of the main body part is arranged in the opening window, the ends of each first extension and the end of the second extension are respectively adhered to the circuit board through silicone pads, only one pressure sensor is arranged near the connection opening window edge of the second extension, and a screw column fixing point for fixing the support is arranged at the connection between the opening window corner of the main body part and the first extension. In this way, compared with the prior art, multiple pressure sensors need to be arranged in the touchpad, not only saving the space of the touchpad, but also being conducive to heat dissipation of the touchpad and arrangement of components when new functions are added, improving the flexibility of space use of the touchpad, and reducing the number of sensors used, thereby reducing costs.

[0063] In a possible implementation manner, the connection between the main body part 1301 and the four first extensions 1302 is provided with a screw column fixing point for fixing the support 130.

[0064] In the embodiment of the present disclosure, screw column fixing points are arranged at the connection between the main body 1301 and the four first extension parts 1302 for fixing the support 130. The support is firmly fixed in place below the circuit board 110 by fasteners such as screws. The screw column fixing points provide additional mechanical strength and stability, ensuring that the support does not loosen or shift when subjected to external forces or vibrations.

[0065] In one possible implementation, the ends of each of the first extension parts 1302 and the ends of the second extension part 1303 are adhered to the circuit board 110 by silica gel pads.

[0066] In the embodiment of the present disclosure, the ends of each of the first extension parts 1302 and the ends of the second extension part 1303 are adhered to the circuit board 110 by silica gel pads. As a soft and elastic material, silica gel pads are used as an adhesive between the support and the circuit board. It not only provides good adhesion, but also can buffer vibrations and impacts to some extent, protecting the circuit board from damage. During assembly, an appropriate amount of silica gel is applied to the ends of the support and pressed onto the corresponding position on the circuit board. After the silica gel solidifies, the support is firmly adhered to the circuit board.

[0067] In one possible implementation, the width and extension length of the second extension part 1303 are greater than those of the pressure sensor 120.

[0068] In the embodiment of the present disclosure, the width and extension length of the second extension part 1303 are greater than those of the pressure sensor 120. This ensures that the pressure sensor 120 can be stably installed on the second extension part 1303 and will not shake or fall off due to size mismatch. Secondly, the larger size also provides a certain protection space for the pressure sensor, preventing it from being damaged by external impact or collision.

[0069] Generally, the pressure sensor 120 is installed on the opening of the second extension part 1303. In this way, when the pressure sensor is placed on the platform, there will be a certain amount of space around it, thereby ensuring its stability and safety.

[0070] The embodiment of the present disclosure also provides a touchpad pressure detection method applied to the touch controller of the touchpad in any of the preceding embodiments, as shown in Figure 2 The method comprises:

[0071] In step S21, the touch trajectory of the finger on the touchpad is determined according to the touch sensing signal received from the touch electrode layer.

[0072] In the embodiments of the present disclosure, the touch controller first receives touch sensing signals from the touch electrode layer. These signals usually contain information about the change in capacitance or resistance caused by the movement of the finger on the touchpad. The touch electrode layer is composed of a plurality of tiny electrodes that can form an electric field network. When the finger approaches or contacts the touchpad, it will change the electric field distribution between the electrodes, thereby generating measurable signal changes.

[0073] In order to determine the touch trajectory of the finger, the touch controller uses "coordinate mapping" or "signal analysis". Specifically, the touch controller calculates the specific position of the finger on the touchpad according to the intensity, phase, frequency and other characteristic parameters of the received touch sensing signals. This calculation process may also involve signal filtering, denoising, interpolation and the like to improve the accuracy and stability of the position calculation.

[0074] Among them, as the finger moves on the touchpad, the touch controller will continuously receive new touch sensing signals and update the position information of the finger in real time. Connecting these position information in time sequence forms the touch trajectory of the finger on the touchpad.

[0075] In step S22, the pressing force of each touch position of the finger on the touch trajectory is determined according to the touch trajectory and the pressure sensing signal received from the pressure sensor.

[0076] In the embodiments of the present disclosure, the touch controller obtains the touch trajectory (i.e. position information) of the finger on the touchpad, and then needs to determine the pressing force of each position of the finger on the touch trajectory in combination with the pressure sensing signal received from the pressure sensor.

[0077] Among them, the unique pressure sensor is usually installed below the touchpad or in close contact with the touchpad, which can detect the pressing force conducted through the first extension part 1302 or the second extension part 1303. When the finger presses the touchpad, the pressing force will cause the cantilever beam to deform, thereby changing the physical state (such as resistance, capacitance, etc.) inside the pressure sensor, thereby generating a measurable pressure sensing signal.

[0078] In order to determine the pressing force of each touch position, the touch controller matches the position information on the touch trajectory with the corresponding pressure sensing signal. For example, by looking up the table, the corresponding pressure of each touch position when subjected to different pressure sensing signals is queried, that is, the pressing force of the touch position is determined. Specifically, according to the time stamp of each position point on the touch trajectory, the corresponding pressure sensing signal value is found in the same time period. Then, the pressure sensing signal value is converted to a specific pressing force value by using a calibration curve or a mathematical model.

[0079] In one possible implementation, referring toFigure 3 In step S22, determining the pressing force of each touch position on the touch trajectory according to the touch trajectory and the pressure sensing signal received from the pressure sensor includes:

[0080] In step S2201, the pressure sensing signal sensed by the pressure sensor at the farthest touch position from the position of the pressure sensor is amplified according to a first amplification ratio corresponding to the farthest touch position.

[0081] In the embodiments of the present disclosure, the touch controller identifies the touch position farthest from the position of the pressure sensor in the touch trajectory. Since the pressure sensor may not be able to directly and accurately sense the weak pressure change far from its position, especially in the case of a large touchpad or limited sensitivity of the pressure sensor, it is necessary to amplify the pressure sensing signal at these positions.

[0082] In the embodiments of the present disclosure, the touch controller amplifies the pressure sensing signal sensed by the pressure sensor at the farthest touch position according to a first amplification ratio preset or dynamically calculated. This amplification ratio can be determined based on various factors such as the size of the touchpad, the sensitivity of the pressure sensor, the mechanical properties of the material, and experimental data.

[0083] Suppose that on the touchpad of a notebook computer, the user slides the finger from the upper left corner to the lower right corner, and applies a click action at the lower right corner. Since the lower right corner is the farthest position from the pressure sensor in the touch trajectory, the pressure sensing signal sensed by the pressure sensor at this position is amplified according to the first amplification ratio (such as 1.5 times) preset for this farthest position. This is done to ensure that even at the farthest position, weak pressing force can be accurately identified. The amplification ratio of each position is determined according to its distance from the position of the pressure sensor, and generally, the farther the distance from the position of the sensor, the smaller the ratio.

[0084] In step S2202, it is determined whether the amplified pressure sensing signal reaches a preset pressing force.

[0085] In the embodiments of the present disclosure, it is compared whether the amplified pressure sensing signal reaches a preset pressing force threshold. This preset pressing force threshold is set according to factors such as the application scenario of the device, user habits, operation feedback, etc., and is used to distinguish whether the user intentionally applies a pressing action or only performs a touch slide.

[0086] If the amplified pressure sensing signal reaches the preset pressing force threshold, it is considered that the user performs an effective pressing operation at this position; if it does not reach, it can continue to be judged or can be considered as an ordinary touch slide or invalid operation.

[0087] Continuing the example of the notebook computer, assume that the preset pressing force threshold is 100 units. If the amplified pressure sensing signal reaches or exceeds 100 units, it is considered that the user has performed an effective click operation at the lower right corner position; if it is lower than 100 units, it can be considered that the user has simply slid through the position.

[0088] In step S2203, in the case that the amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signal sensed by the pressure sensor at each touch position on the touch track is amplified by the first amplification ratio respectively, to obtain the pressing force of the finger at each touch position on the touch track.

[0089] In the embodiments of the present disclosure, if the amplified pressure sensing signal of the farthest touch position reaches the preset pressing force threshold, the pressure sensing signal sensed by the pressure sensor at each touch position on the touch track is amplified by the first amplification ratio determined previously. The purpose of this is to ensure that the pressing force of the finger at each position on the touch track can be accurately and consistently identified.

[0090] In the embodiments of the present disclosure, a unified amplification ratio (i.e. the first amplification ratio) is used for processing, which simplifies the calculation and improves the efficiency. For example, in the example of the notebook computer, if it is confirmed that the user has performed an effective click operation at the lower right corner position, the pressure sensing signal at each position on the touch track is amplified by the first amplification ratio (1.5 times) determined previously. In this way, no matter how the user's finger moves and presses on the touchpad, the pressing force of the finger at each position can be accurately identified.

[0091] In one possible implementation manner, the method further includes:

[0092] In step S2204, in the case that the first amplified pressure sensing signal does not reach the preset pressing force, the pressure sensing signal sensed by the pressure sensor at the farthest touch position is amplified according to a second amplification ratio corresponding to the second farthest touch position in the touch track relative to the position of the pressure sensor, wherein the second amplification ratio is greater than the first amplification ratio;

[0093] If the pressure sensing signal of the farthest touch position amplified by the first amplification ratio still does not reach the preset pressing force threshold, the second farthest touch position in the touch track relative to the position of the pressure sensor is found, and a second amplification ratio corresponding to the position is determined. Since the second farthest position is closer to the pressure sensor than the farthest position, theoretically, the original pressure sensing signal thereof should be stronger, but for safety, the system still uses a larger amplification ratio (i.e., the second amplification ratio) to further amplify the pressure sensing signal of the position.

[0094] The second amplification ratio is set according to the size of the touchpad, the sensitivity of the pressure sensor, the mechanical properties of the material, and experimental data, and the value thereof is greater than the first amplification ratio, so as to ensure that even at the farthest or second farthest position, a weak pressing force can be accurately identified.

[0095] Continuing the previous notebook computer example, assume that the user slides the finger from the upper left corner to the lower right corner, and applies a relatively weak click action at the lower right corner. The system first amplifies the pressure sensing signal of the lower right corner position by the first amplification ratio (1.5 times), but finds that the amplified signal still does not reach the preset pressing force threshold (100 units). Then, the second farthest position is found, and a larger second amplification ratio (e.g., 2 times) is determined. Then, the pressure sensing signal of the lower right corner position is re-amplified using the second amplification ratio.

[0096] In step S2205, it is determined whether the amplified pressure sensing signal reaches the preset pressing force;

[0097] In the embodiment of the present disclosure, it is compared whether the pressure sensing signal amplified by the second amplification ratio reaches the preset pressing force threshold. This process is similar to step S2202, but at this time, the signal processed by a larger amplification ratio is being evaluated.

[0098] Continuing the above example, if the pressure sensing signal amplified by the second amplification ratio (2 times) reaches or exceeds the preset pressing force threshold (100 units), it is considered that the user performs an effective click operation at the lower right corner position.

[0099] In step S2206, in the case that the re-amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signal sensed by the pressure sensor at each touch position on the touch track is amplified by the second amplification ratio, to obtain the pressing force of the finger at each touch position on the touch track.

[0100] In the embodiments of the present disclosure, if the pressure sensing signal of the farthest touch position amplified by the second amplification ratio reaches the preset pressing force threshold, the pressure sensing signals of each touch position on the whole touch trajectory are amplified by the second amplification ratio. This is to ensure that the pressing force of the finger can be accurately and consistently identified in the whole touch process, no matter where the finger is located.

[0101] In the example of a notebook computer, if the pressure sensing signal of the lower right corner position amplified by the second amplification ratio (2 times) reaches the preset pressing force threshold, the pressure sensing signals of each position on the touch trajectory are amplified by the second amplification ratio. In this way, no matter how the user moves and presses the finger on the touchpad, the system can accurately identify the pressing force of the finger at each position.

[0102] In step S2207, in the case that the re-amplified pressure sensing signal does not reach the preset pressing force, the step of amplifying the pressure sensing signal sensed by the pressure sensor at the farthest touch position in the touch trajectory and determining whether the amplified pressure sensing signal reaches the preset pressing force is sequentially performed according to a third amplification ratio corresponding to the farthest touch position relative to the position of the pressure sensor, until the re-amplified pressure sensing signal reaches the preset pressing force. The pressure sensing signals sensed by the pressure sensor at each touch position are amplified by the amplification ratio corresponding to the re-amplified pressure sensing signal, and the pressing force of the finger at each touch position on the touch trajectory is obtained.

[0103] In the embodiments of the present disclosure, if the pressure sensing signal of the farthest touch position amplified by the second amplification ratio still does not reach the preset pressing force threshold, it will continue to search backward along the touch trajectory to determine the next touch position that is relatively closer to the pressure sensor but still belongs to the "far end", and assign a larger amplification ratio (such as a third amplification ratio) to this position. This process will be repeated until the amplified pressure sensing signal reaches the preset pressing force threshold.

[0104] On the touchpad of a notebook computer, the user slides the finger from the upper left corner to the lower right corner, and applies a very weak click action at the lower right corner. First, the pressure sensing signal of the lower right corner position is amplified by the first amplification ratio and the second amplification ratio, but neither of them can reach the preset pressing force threshold (for example, 100 units). At this time, the search is continued backward along the touch trajectory to determine another position on the touch trajectory that is relatively closer to the center of the touchpad but still belongs to the "far end" (which can be called the "second farthest position"), and a third amplification ratio (such as 2.5 times) is assigned to this position.

[0105] The pressure sensing signal of the "second farthest position" is amplified using a third amplification ratio, and the amplified signal is checked again to see if it reaches the preset pressing force threshold. If it still does not reach, the next position is continued to be searched and a larger amplification ratio is assigned until the condition is met. For example: after amplification using a third amplification ratio (2.5 times), it is found that the pressure sensing signal of the lower right corner position finally reaches the preset pressing force threshold (100 units). At this time, it is considered that the user has performed an effective click operation at the lower right corner position.

[0106] Amplify the pressure sensing signal of each touch position: determine that the pressure sensing signal of the farthest (or second farthest, second second farthest, etc.) touch position after amplification using a certain amplification ratio (in this example, the third amplification ratio) reaches the preset pressing force threshold, and use this amplification ratio to amplify the pressure sensing signal of each touch position on the entire touch trajectory. This ensures that during the entire touch process, no matter where the finger is, the pressing force can be accurately and consistently identified. In the example of the touchpad of the notebook computer, the system uses the third amplification ratio (2.5 times) to amplify the pressure sensing signal of each position on the touch trajectory. In this way, no matter how the user's finger moves and presses on the touchpad, the pressing force of the finger at each position can be accurately identified, thereby providing the user with a more accurate and smooth touch experience.

[0107] In one possible implementation, the method further includes:

[0108] In step S2208, in the case where the first amplified pressure sensing signal does not reach the preset pressing force, the pressure sensor amplifies the pressure sensing signal of the position corresponding to the second farthest touch position relative to the position of the pressure sensor by the first amplification ratio;

[0109] In the embodiment of the present disclosure, if the pressure sensing signal of the farthest touch position after amplification using the first amplification ratio does not reach the preset pressing force threshold, the second farthest touch position in the touch trajectory relative to the position of the pressure sensor is processed. The second farthest position refers to the touch point that is second farthest from the pressure sensor in addition to the farthest position. The pressure sensing signal of the second farthest position is amplified using the same first amplification ratio as that used for the farthest position. The purpose of this is because although the second farthest position is closer to the pressure sensor than the farthest position, its original pressure sensing signal may still not be sufficient to be directly identified as an effective pressing force, and therefore needs to be enhanced in strength by amplification.

[0110] In the touchpad scenario of a notebook computer, a user slides a finger from the top-left corner to the bottom-right corner and applies a weak click action at the bottom-right corner. First, try to amplify the pressure sensing signal at the farthest position (the bottom-right corner), but find that the amplified signal is still below the preset press force threshold. Then, focus on the next farthest position and amplify the pressure sensing signal at this position using a first amplification ratio (e.g., 1.5 times).

[0111] In step S2209, it is determined whether the amplified pressure sensing signal reaches the preset press force.

[0112] In the embodiments of the present disclosure, it is compared whether the pressure sensing signal at the next farthest position amplified using the first amplification ratio reaches the preset press force threshold. This process is similar to the previous steps, but now the amplified pressure signal at the next farthest position is being evaluated.

[0113] Continuing the above example, if it is found that the pressure sensing signal at the next farthest position amplified using the first amplification ratio reaches the preset press force threshold (e.g., 100 units), then the press operation at this position is considered valid.

[0114] In step S2210, in the case where the amplified pressure sensing signal reaches the preset press force, the pressure sensing signals sensed by the pressure sensor at each touch position except the farthest touch position are amplified by the first amplification ratio, and the pressure sensing signal at the next farthest touch position after amplification is taken as the pressure sensing signal at the farthest touch position, to obtain the press force of the finger at each touch position on the touch track.

[0115] In the embodiments of the present disclosure, the pressure sensing signal at the next farthest position amplified using the first amplification ratio reaches the preset press force threshold, and this first amplification ratio is used to amplify the pressure sensing signals at each touch position on the touch track except the farthest position. This is because since the next farthest position can reach the preset press force through the first amplification ratio, other positions (closer to the pressure sensor) can also accurately reflect the user's press force through the same amplification ratio.

[0116] At the same time, the pressure sensing signal at the next farthest position after amplification is taken as the pressure sensing signal at the farthest position. This is because in actual applications, the farthest position can have a serious signal attenuation due to being too far away from the pressure sensor, while the next farthest position is closer to the sensor and reaches the preset press force after amplification, and thus can be a more reliable alternative.

[0117] In the example of the touchpad of a notebook computer, if it is confirmed that the amplified pressure sensing signal of the second farthest position reaches the preset pressing force threshold, then it uses this first amplification ratio (1.5 times) to amplify the pressure sensing signal of each position on the touch trajectory except the lower right corner (the original farthest position). Meanwhile, the amplified pressure sensing signal of the second farthest position is used as the pressure sensing signal of the lower right corner position, because this can ensure that throughout the entire touch process, no matter which position the finger is in, the pressing force can be accurately and consistently identified.

[0118] In step S2211, in the case that the amplified pressure sensing signal does not reach the preset pressing force, the pressure sensing signal of the position corresponding to the second farthest touch position relative to the position of the pressure sensor is amplified by the first amplification ratio in turn, it is determined whether the amplified pressure sensing signal reaches the preset pressing force, until the amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signal sensed by the pressure sensor at each touch position except the touch position corresponding to the amplified pressure sensing signal which does not reach the preset pressing force is amplified by the first amplification ratio respectively, and the pressure sensing signal of the touch position corresponding to the amplified pressure sensing signal which reaches the preset pressing force this time is used as the pressure sensing signal of the touch position corresponding to the amplified pressure sensing signal which does not reach the preset pressing force, to obtain the pressing force of the finger at each touch position on the touch trajectory.

[0119] In the embodiment of the present disclosure, in the previous steps, the pressure sensing signals of the farthest touch position and the second farthest touch position have been amplified and it is checked whether the amplified signals reach the preset pressing force threshold. Since the amplified pressure sensing signal does not reach the preset pressing force, this process will continue until a touch position is found whose amplified pressure sensing signal can meet the preset pressing force requirement.

[0120] In the embodiment of the present disclosure, if the amplified pressure sensing signal of the second farthest touch position still does not reach the preset pressing force, it will continue to search backward along the touch trajectory to determine the next touch position which is relatively closer to the pressure sensor but has not been checked yet (which can be referred to as the "second farthest position"). Then, the pressure sensing signal of this position is amplified using the first amplification ratio, and it is checked whether the amplified signal reaches the preset pressing force threshold. In the scenario of the touchpad of a notebook computer, if the amplified pressure sensing signal of the second farthest position is still lower than the preset pressing force threshold, the next position (i.e. the second farthest position) on the touch trajectory is searched, and the pressure sensing signal of this position is amplified using the first amplification ratio (such as 1.5 times).

[0121] In the disclosed embodiment, the amplified pressure sensing signal at the furthest position is compared to see if it reaches a preset pressure threshold. If so, the search is stopped and the subsequent steps are continued; if not, the search continues to the next position and the amplification and checking process is repeated.

[0122] If the pressure sensing signal at the amplified furthest position reaches the preset pressure threshold (e.g., 100 units), further searching stops and the press operation at that position is considered valid. The touch positions other than those that did not meet the threshold are amplified, and the pressure sensing signals at those positions are updated.

[0123] Once a touch position is found and its amplified pressure sensing signal reaches the preset pressure threshold, the following operations are performed:

[0124] Uniform amplification: amplifying the pressure sensing signals of all touch positions except those touch positions whose pressure sensing signals do not reach the preset pressure threshold after amplification using the first amplification ratio.

[0125] Updating the signals for positions that failed to meet the threshold: The amplified pressure sensing signals corresponding to the touch positions that reached the preset pressure threshold after this amplification are used as the pressure sensing signals for those touch positions whose amplified pressure sensing signals still failed to meet the preset pressure threshold. This step is based on the assumption that since positions farther away from the pressure sensor (such as those that reached the threshold this time) can reflect valid pressure through amplification, positions closer to the sensor (i.e., those that failed to meet the threshold) should also be able to reflect similar pressure at the same amplification ratio, even though their original signals may be weaker.

[0126] If the amplified pressure sensing signal at the furthest position reaches the preset pressure threshold, the first amplification ratio (1.5x) is used to amplify the pressure sensing signals at all touch positions on the touch track, except for those touch positions that still do not reach the preset pressure threshold after amplification. At the same time, the amplified pressure sensing signal at the furthest position is used as the pressure sensing signal for those positions that do not meet the threshold (such as the initial furthest position and the second furthest position).

[0127] This ensures that no matter where the finger is located along the entire touch trajectory, its pressing force can be accurately and consistently identified, providing users with a more precise and smooth touch experience.

[0128] In one possible implementation, see Figure 4 As shown, in step S21, determining the touch track of the finger on the touch panel according to the touch sensing signal received from the touch electrode layer includes:

[0129] In step S211, an electrical signal of a preset voltage is sent to each driving electrode of the array of capacitive sensing points in the touch electrode layer in turn periodically;

[0130] In the embodiments of the present disclosure, an electrical signal of a preset voltage is sent to each driving electrode of the array of capacitive sensing points in turn periodically (e.g., several hundred or several thousand times per second). This electrical signal is usually an alternating current signal (AC) with a frequency and amplitude that are preset in advance to form a measurable capacitive field between the driving electrode and the receiving electrode.

[0131] Suppose the touch electrode layer contains a 100x100 array of capacitive sensing points, i.e., 10,000 driving electrodes and a corresponding number of receiving electrodes. In the first cycle, an electrical signal of a preset voltage is sent to the first driving electrode, and then a period of time (usually a complete cycle of the electrical signal) is waited to allow the capacitive effect to stabilize. Then, the same operation is repeated for the second driving electrode, and so on, until all driving electrodes are traversed. This process is repeated in subsequent cycles to continuously monitor the capacitive changes on the touchpad.

[0132] In step S212, a plurality of charge variation amounts of each receiving electrode for each driving electrode in the current cycle are determined according to the received received charge amount of each receiving electrode of the array of capacitive sensing points in the current cycle and the preset reference charge amount corresponding to each driving electrode.

[0133] In the embodiments of the present disclosure, in each cycle, when a driving electrode is activated (i.e., an electrical signal of a preset voltage is applied), the adjacent receiving electrodes will sense the capacitive changes caused by the proximity or touch of the finger. Such capacitive changes will cause corresponding charge changes on the receiving electrodes, and these charge changes can be obtained indirectly by measuring the current on the receiving electrodes (because the current is the rate of change of charge over time).

[0134] In order to accurately determine the charge variation amount on each receiving electrode, the received charge amount sensed by each receiving electrode when each driving electrode is activated is recorded and compared with a preset reference charge amount. The reference charge amount is the charge amount generated by the inherent capacitance between the driving electrode and the receiving electrode when there is no finger touch. By comparing the actual received charge amount and the reference charge amount, the system can calculate the charge variation amount caused by the finger touch.

[0135] Continuing the example above, when the first drive electrode is activated, the charge change on all the receive electrodes is monitored simultaneously. Assume that the baseline amount of charge induced on a certain receive electrode in the absence of a finger touch is Q0. However, in the actual measurement, the amount of charge induced on this receive electrode becomes Q1 due to the proximity or touch of the finger. Then the amount of charge change AQ caused by the finger touch can be calculated as Q1 - Q0. This process is repeated for each receive electrode when each drive electrode is activated, resulting in a dataset containing multiple amounts of charge change, which reflect the capacitance changes at different locations on the touchpad.

[0136] In step S213, a three-dimensional charge change array is constructed with the multiple amounts of charge change corresponding to different periods for each receive electrode, the driving coordinates of each drive electrode in the capacitive sensing point array, and the receiving coordinates of each receive electrode in the capacitive sensing point array.

[0137] In the embodiments of the present disclosure, a three-dimensional charge change array is constructed using the amounts of charge change collected from each receive electrode when each drive electrode is activated, combined with the physical positions (i.e., driving coordinates and receiving coordinates) of the drive electrodes and receive electrodes in the capacitive sensing point array. Each element of this three-dimensional array represents the amount of charge change caused by the finger touch under a specific combination of drive electrode and receive electrode.

[0138] Specifically, the dimensions of the three-dimensional charge change array usually correspond to the dimensions of the capacitive sensing point array. For example, if the capacitive sensing point array is a 100x100 grid, the three-dimensional charge change array will also be a 100x100x100 cube.

[0139] In step S214, an axis charge change function is constructed along each axis direction of the three-dimensional charge change array, and the axis charge change functions of each axis are fitted based on the least squares method to obtain a touch charge change function, and the touch position of the finger on the touchpad is determined according to the touch charge change function.

[0140] In the embodiments of the present disclosure, an axis charge change function is constructed along each axis direction (usually X-axis, Y-axis and Z-axis) of the three-dimensional charge change array. These functions describe the trend of the amount of charge change changing with position in different axis directions.

[0141] Then, mathematical methods such as least squares method are used to fit these axis charge change functions to find the function form that best describes the actual charge change data. The least squares method finds the best function match of the data by minimizing the sum of squares of errors, thereby obtaining a touch charge change function.

[0142] Finally, the touch position of the finger on the touchpad is determined according to the fitted touch charge variation function. This usually involves finding the extreme point or a certain threshold point in the function, which corresponds to the maximum charge variation caused by the finger touch, so that the touch position can be inferred.

[0143] For example, assuming that an axis charge variation function is constructed in the X-axis direction, which describes the average charge variation sensed by the receiving electrode at different X coordinates. By fitting this function through the least square method, a curve in the form of a quadratic function or Gaussian function is obtained, which reaches a maximum at a certain X coordinate, and this maximum corresponds to the touch position of the finger in the X-axis direction.

[0144] Similarly, the same operation can be performed in the Y-axis direction to obtain the touch position of the finger in the Y-axis direction. For the Z-axis direction, the periodic transmission of the electric signal can also represent the movement of the finger, and finally, the positions of different axes are combined to determine the two-dimensional touch position of the finger on the touchpad.

[0145] In an embodiment of the present disclosure, an electronic device is also provided, comprising:

[0146] a memory having a computer program stored thereon;

[0147] a processor configured to execute the computer program in the memory to implement the steps of the method according to any one of the preceding embodiments.

[0148] The present disclosure also provides a computer readable storage medium having program codes stored thereon, which, when executed by a processor, can implement the steps and corresponding contents of the preceding embodiments.

[0149] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Within the technical concept of the present disclosure, various changes, modifications, replacements and variations can be made to these embodiments, and these changes, modifications, replacements and variations all belong to the protection scope of the present disclosure.

[0150] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any suitable manner without contradiction, and should be considered as disclosed by the present disclosure. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure. The technical scope of the present application is not limited to the content in the specification.

Claims

1. A touch panel, characterized in that: include: A circuit board, a pressure sensor, a bracket and a touch controller, wherein the circuit board and the pressure sensor are electrically connected to the touch controller respectively; The bracket is disposed below the circuit board, comprising a main body and four first extensions extending from four corners of the main body in a direction away from the main body. A window is disposed in a middle region of the main body, and a second extension connected to any window edge of the main body is disposed within the window. The ends of each first extension and the second extension are respectively adhered to the circuit board. The second extension is provided with a single pressure sensor near the edge connected to the window. The main body, the four first extensions, and the second extension are integrally formed. A touch electrode layer is provided on the upper surface of the circuit board, and the touch electrode layer is used to sense touch sensing signals in response to an action of touching or pressing the touch panel, and output the touch sensing signals to the touch controller; The pressure sensor is configured to deform when the pressing force generated by touching or pressing the touch panel is transmitted to the second extension portion, and output a corresponding pressure sensing signal; The touch controller is used to determine a touch track of a finger on the touch panel based on a touch sensing signal received from the touch electrode layer, and to determine the pressing force of the finger at each touch position on the touch track based on the touch track and a pressure sensing signal received from the pressure sensor.

2. The touch panel according to claim 1, wherein The connection between the main body and the four first extensions is provided with screw column fixing points for fixing the bracket.

3. The touch panel according to claim 1, wherein The ends of the first extension parts and the second extension parts are respectively adhered to the circuit board through silicone pads.

4. The touch panel according to claim 1, wherein: The width and the extension length of the second extension portion are both greater than those of the pressure sensor.

5. A touch panel pressure detection method, characterized in that: The touch controller applied to the touch panel according to any one of claims 1 to 4, the method comprising: determining a touch track of the finger on the touch panel according to a touch sensing signal received from the touch electrode layer; The pressing force of the finger at each touch position on the touch track is determined according to the touch track and the pressure sensing signal received from the pressure sensor.

6. The touch panel pressure detection method according to claim 5, wherein: The determining, based on the touch track and the pressure sensing signal received from the pressure sensor, the pressing force of the finger at each touch position on the touch track, comprises: amplifying the pressure sensing signal sensed by the pressure sensor at the farthest touch position relative to the position of the pressure sensor in the touch trajectory according to a first amplification ratio corresponding to the farthest touch position from the position of the pressure sensor; Determine whether the amplified pressure sensing signal reaches a preset pressing force; When the amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signal sensed by the pressure sensor at each touch position is amplified by the first amplification ratio to obtain the pressing force of the finger at each touch position on the touch track.

7. The touch panel pressure detection method according to claim 6, wherein: The method further comprises: When the amplified pressure sensing signal does not reach the preset pressing force, amplifying the pressure sensing signal sensed by the pressure sensor at the farthest touch position in the touch trajectory according to a second amplification ratio corresponding to the second farthest touch position relative to the position of the pressure sensor, wherein the second amplification ratio is greater than the first amplification ratio; determining whether the amplified pressure sensing signal reaches the preset pressing force; When the re-amplified pressure sensing signal reaches the preset pressing force, amplifying the pressure sensing signal sensed by the pressure sensor at each touch position according to the second amplification ratio to obtain the pressing force of the finger at each touch position on the touch track; If the re-amplified pressure sensing signal does not reach the preset pressing force, the steps of amplifying the pressure sensing signal sensed by the pressure sensor at the farthest touch position in the touch trajectory, and then determining whether the amplified pressure sensing signal reaches the preset pressing force are performed sequentially according to a third amplification ratio corresponding to the farthest touch position relative to the position of the pressure sensor in the touch trajectory, until the re-amplified pressure sensing signal reaches the preset pressing force. The pressure sensing signal sensed by the pressure sensor at each touch position is amplified according to the amplification ratio corresponding to the re-amplified pressure sensing signal to obtain the pressing force of the finger at each touch position on the touch trajectory.

8. The touch panel pressure detection method according to claim 6, wherein: The method further comprises: When the amplified pressure sensing signal does not reach the preset pressing force, amplifying the pressure sensing signal corresponding to the touch position of the pressure sensor that is the second farthest from the position of the pressure sensor by the first amplification ratio; determining whether the amplified pressure sensing signal reaches the preset pressing force; When the amplified pressure sensing signal reaches the preset pressing force, amplifying the pressure sensing signal sensed by the pressure sensor at each touch position except the farthest touch position according to the first amplification ratio, and using the pressure sensing signal corresponding to the second farthest touch position after amplification as the pressure sensing signal of the farthest touch position, to obtain the pressing force of the finger at each touch position on the touch track; When the amplified pressure sensing signal does not reach the preset pressing force, the pressure sensing signal corresponding to the farthest touch position of the pressure sensor relative to the position of the pressure sensor is amplified in sequence by the first amplification ratio to determine whether the amplified pressure sensing signal reaches the preset pressing force, until the amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signal sensed by the pressure sensor at each touch position except the touch position corresponding to the amplified pressure sensing signal not reaching the preset pressing force is amplified by the first amplification ratio respectively, and the pressure sensing signal corresponding to the touch position corresponding to the preset pressing force after the pressure sensing signal this time is amplified is used as the pressure sensing signal of the touch position corresponding to the amplified pressure sensing signal not reaching the preset pressing force, thereby obtaining the pressing force of the finger at each touch position on the touch trajectory.

9. The touch panel pressure detection method according to claim 5, wherein: The step of determining the touch track of the finger on the touch panel according to the touch sensing signal received from the touch electrode layer includes: Periodically and sequentially sending an electrical signal of a preset voltage to each driving electrode of the capacitive sensing point array in the touch electrode layer; Determining multiple charge changes of each receiving electrode for each driving electrode in the current cycle based on the received charge amount induced by the driving motor applying the electrical signal each time on each receiving electrode of the capacitive sensing point array in the current cycle and the preset reference charge amount corresponding to each driving electrode; Constructing a three-dimensional charge change array based on a plurality of charge change amounts corresponding to the receiving electrodes in different periods, the driving coordinates of the driving electrodes in the capacitive sensing point array, and the receiving coordinates of the receiving electrodes in the capacitive sensing point array; An axis charge change function is constructed along each axis direction of the three-dimensional charge change array, and the axis charge change function of each axis is fitted based on the least squares method to obtain a touch charge change function, and the touch trajectory of the finger on the touch panel is determined based on the touch charge change function.

10. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 5 to 9.

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