Touch panel, touch panel pressure detection method and device

Abstract

The invention relates to a touchpad and a touchpad pressure detection method and device.The touchpad comprises 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 the four corners of the main body part in the direction away from the main body part, and a window is formed in the middle area 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 tail 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 window edge; a touch electrode layer is arranged on the upper surface of the circuit board and is used for sensing a touch position in response to a touch or pressing action and outputting a touch sensing signal; the pressure sensor deforms when a pressing force generated by touching or pressing is transmitted to the cantilever beam, and outputs a pressure sensing signal; and the touch controller determines a touch track of a finger on the touch panel according to the touch sensing signal, and determines a pressing force according to the touch track and the pressure sensing signal.

Description

Technical Field

[0001] The present disclosure relates to the field of device control technology, and in particular to a touch panel, a touch panel pressure detection method and a device. Background Art

[0002] In modern electronic devices, touch panels, as a user input interface, have been widely used in devices such as laptops. As users have higher and higher requirements for the performance of touch panels, it is necessary not only to improve the accuracy of sensing the touch position, but also to reduce the production cost of touch panels. Summary of the invention

[0003] The purpose of the present invention is to provide a touch panel, a touch panel pressure detection method and a device, aiming to improve the efficiency and convenience of inputting text content on a display screen such as a television.

[0004] In order to achieve the above-mentioned object, a first aspect of an embodiment of the present disclosure provides a touch panel, comprising: 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 arranged below the circuit board, and includes a main body, and four first extensions extending from the four corners of the main body toward a direction away from the main body, a window is arranged in the middle area of ​​the main body, a second extension connected to any window edge of the main body is arranged in the window, the end of each first extension and the end of the second extension are respectively adhered to the circuit board, and the second extension is provided with a unique pressure sensor near the edge connected to the window; Wherein, a touch electrode layer is disposed on the upper surface of the circuit board, and the touch electrode layer is used to sense a touch sensing signal in response to an action of touching or pressing the touch panel, and output the touch sensing signal to the touch controller; The pressure sensor is used to deform when the pressing force generated when touching or pressing the touch panel is transmitted to the cantilever beam, and output a corresponding pressure sensing signal; The touch controller is used to determine a touch track of the finger on the touch panel based on a touch sensing signal received from the touch electrode layer, and to determine a 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.

[0005] In a possible implementation, a screw column fixing point for fixing the bracket is provided at a connection between the main body and the four first extensions.

[0006] In a possible implementation, the end of each of the first extension portions and the end of the second extension portion are respectively adhered to the circuit board through a silicone pad.

[0007] In one possible implementation, the width and the extension length of the second extension portion are both greater than those of the pressure sensor.

[0008] A second aspect of the embodiments of the present disclosure provides a touch panel pressure detection method, which is applied to the touch controller of the touch panel described in any one of the first aspects, and the method includes: 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.

[0009] In a possible implementation, determining the pressing force of the finger at each touch position on the touch track according to the touch track and the pressure sensing signal received from the pressure sensor includes: 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 track according to a first amplification ratio corresponding to the farthest touch position in the touch track; 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.

[0010] In one possible implementation, the method further includes: When 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 according to a second amplification ratio corresponding to the second farthest touch position relative to the position of the pressure sensor in the touch track, 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, the pressure sensing signal sensed by the pressure sensor at each touch position is amplified by the second amplification ratio to obtain the pressing force of each touch position of the finger on the touch track; In a case where 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 relative to the position of the pressure sensor in the touch trajectory, and determining whether the amplified pressure sensing signal reaches the preset pressing force are performed in sequence according to a third amplification ratio corresponding to the farthest touch position in the touch trajectory, until the re-amplified pressure sensing signal reaches the preset pressing force, and the pressure sensing signal sensed by the pressure sensor at each touch position is amplified respectively 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.

[0011] In one possible implementation, the method further includes: When the first amplified pressure sensing signal does not reach the preset pressing force, amplifying the pressure sensing signal corresponding to the second farthest touch position of the pressure sensor relative to 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, the pressure sensing signal sensed by the pressure sensor at each of the touch positions except the farthest touch position is amplified by the first amplification ratio, and the pressure sensing signal after the pressure sensing signal corresponding to the second farthest touch position is amplified is used as the pressure sensing signal of the farthest touch position, so as 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 where the pressure sensor is located 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 does not reach the preset pressing force is amplified by the first amplification ratio, and the pressure sensing signal corresponding to the touch position corresponding to the preset pressing force after the pressure sensing signal amplified this time is amplified as the pressure sensing signal of the touch position corresponding to the amplified pressure sensing signal does not reach the preset pressing force, so as to obtain the pressing force of the finger at each touch position on the touch trajectory.

[0012] In a possible implementation, 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; Determine multiple charge change amounts of each receiving electrode for each driving electrode in the current cycle according to the received charge amount induced by the driving motor applying the electrical signal each time in the current cycle on each receiving electrode of the capacitive sensing point array and the pre-set 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 each receiving electrode in different periods, a driving coordinate of each driving electrode in the capacitive sensing point array, and a receiving coordinate of each receiving electrode 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 based on the least squares method, the axis charge change function of each axis is fitted to obtain a touch charge change function, and the touch position of the finger on the touch panel is determined according to the touch charge change function.

[0013] According to a third aspect of the present disclosure, an electronic device is provided, including: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement the steps of any one of the methods in the second aspect.

[0014] The present invention provides a touch panel, a touch panel pressure detection method and a device. Compared with the prior art, the present invention has the following beneficial effects: Four first extensions are provided from the four corners of the main body toward the direction away from the main body, a window is provided in the middle area of ​​the main body, a second extension connected to any window edge of the main body is provided in the window, the ends of each first extension and the ends of the second extension are respectively adhered to the circuit board through a silicone pad, the second extension is provided with a unique pressure sensor near the window edge, and a screw column fixing point for fixing the bracket is provided at the connection between the window corner of the main body and the first extension. In this way, compared with the prior art that multiple pressure sensors need to be arranged on the touchpad, not only the space of the touchpad is saved, but also it is beneficial to the heat dissipation of the touchpad and the arrangement of components when adding new functions, and the flexibility of the use of the touchpad space is improved, and the number of sensors used is reduced, thereby reducing the cost.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a touch panel according to an embodiment of the specification.

[0017] Figure 2 The present invention is a flow chart of a touch panel pressure detection method according to an embodiment of the specification.

[0018] Figure 3 This is an implementation shown in the embodiment of the specification. Figure 2 Flowchart of step S22 in FIG.

[0019] Figure 4 This is an implementation shown in the embodiment of the specification. Figure 2 Flowchart of step S21 in FIG. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] The present disclosure provides a touch panel, see Figure 1 As shown, it includes: a circuit board 110, a pressure sensor 120, a bracket 130 and a touch controller, and the circuit board 110 and the pressure sensor 120 are electrically connected to the touch controller respectively; The bracket 130 is arranged below the circuit board 110, and includes a main body 1301, and four first extension parts 1302 extending from four corners of the main body 1301 in directions away from the main body 1301, a window is arranged in the middle area of ​​the main body 1301, a second extension part 1303 connected to any window edge of the main body 1301 is arranged in the window, 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 a unique pressure sensor 120 near the window edge; The main body 1301 is the main part of the bracket and the foundation of the whole structure. It is located below the circuit board 110 and provides stable support. The main body 1301 is a flat plate-shaped base member, which is placed flat just below the circuit board 110.

[0023] The first extensions 1302 extend outward from the four corners of the main body 1301, and these extensions enhance the connection strength and stability between the bracket and the circuit board. The main body 1301, the four first extensions 1302 extending from the four corners of the main body 1301 in a direction away from the main body 1301, and the second extension 1303 are usually formed in one piece. Just like four "legs" extending from the four corners of the flat plate, these "legs" are the first extensions 1302, which point in a direction away from the center of the flat plate and are connected to the edge of the circuit board or the structure below.

[0024] An opening in the middle area of ​​the main body 1301 can reduce weight. Example: A rectangular opening is dug in the center of the flat panel, which can not only allow some parts or components on the circuit board to pass through, but also reduce the weight of the bracket.

[0025] The second extension part 1303 is a part extending inward from the window edge of the main body 1301, and its end is adhered to the circuit board. At the same time, a pressure sensor 120 is installed near the window edge. Example: On one side of the window, there is a "small arm" extending from the edge. The end of the "small arm" is not only adhered to the circuit board, but also carries the pressure sensor 120. In this way, the pressure sensor can directly sense the pressure changes transmitted through the circuit board or the bracket.

[0026] The only pressure sensor 120 is mounted on the second extension 1303 and close to the edge of the connecting window. This allows the sensor to accurately measure the pressure transmitted to the circuit board through the bracket without having to configure multiple pressure sensors at the end of each extension, which can not only save costs but also save space. The pressure sensor 120 is used to detect, convert and output pressure signals, which can be used to perform various control, monitoring or protection operations.

[0027] The upper surface of the circuit board 110 is provided with a touch electrode layer, and the touch electrode layer is used to sense a touch sensing signal in response to the action of touching or pressing the touch panel, and output the touch sensing signal to the touch controller; The touch electrode layer is disposed on the upper surface of the circuit board 110, and is the direct interface between the touch panel and the user's finger. The touch electrode layer can sense and generate a touch sensing signal in response to the action of a finger touching or pressing the touch panel. The touch electrode layer is usually composed of a plurality of tiny electrodes that can detect the capacitance change generated when the finger contacts the touch panel. When the finger approaches or contacts the touch panel, the electric field distribution between the electrodes is changed, thereby generating a measurable signal change. The touch electrode layer transmits the sensed touch sensing signal to the touch controller for processing.

[0028] The pressure sensor 120 is used to deform when the pressing force generated when touching or pressing the touch panel is transmitted to the cantilever beam, and output a corresponding pressure sensing signal; The pressure sensor 120 is mounted on the second extension 1303 of the bracket 130, close to the touch panel but not in direct contact with the finger. Its main function is to detect the pressing force transmitted through the first extension 1302 or the second extension 1303, and output a corresponding pressure sensing signal when deformation occurs.

[0029] When a finger presses the touch pad, 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 undergo physical deformation when subjected to pressure, and this deformation will cause 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.

[0030] The touch controller is used to determine a touch track of the finger on the touch panel based on a touch sensing signal received from the touch electrode layer, and to determine a 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.

[0031] The touch controller is a core component for processing touch sensing signals and pressure sensing signals. It receives the touch sensing signals from the touch electrode layer and the pressure sensing signals from the pressure sensor 120, and performs comprehensive analysis and processing.

[0032] First, the touch controller determines the touch track of the finger on the touchpad based on the touch sensing signal. Then, it combines the touch track with the corresponding pressure sensing signal to calculate the pressure of each touch position on the touch track. This combination of touch position and pressure information can provide users with richer interactive feedback.

[0033] The above technical solution comprises four first extensions extending from the four corners of the main body toward the direction away from the main body, a window is provided in the middle area of ​​the main body, a second extension connected to any window edge of the main body is provided in the window, the ends of each first extension and the ends of the second extension are respectively adhered to the circuit board through a silicone pad, the second extension is provided with a unique pressure sensor near the window edge, and a screw column fixing point for fixing the bracket is provided at the connection between the window corner of the main body and the first extension. In this way, compared with the prior art that requires multiple pressure sensors to be arranged on the touchpad, not only the space of the touchpad is saved, but also it is beneficial to the heat dissipation of the touchpad and the arrangement of components when adding new functions, and the flexibility of the use of the touchpad space is improved, and the number of sensors used is reduced, thereby reducing the cost.

[0034] In a possible implementation, a screw column fixing point for fixing the bracket 130 is provided at a connection between the main body 1301 and the four first extension portions 1302 .

[0035] In the embodiment of the present disclosure, screw column fixing points for fixing the bracket 130 are provided at the connection between the main body 1301 and the four first extensions 1302. The bracket is firmly fixed to a suitable position below the circuit board 110 by fasteners such as screws. The screw column fixing points provide additional mechanical strength and stability, ensuring that the bracket will not loosen or shift when subjected to external force or vibration.

[0036] In a possible implementation, the ends of the first extension portions 1302 and the ends of the second extension portions 1303 are respectively adhered to the circuit board 110 via a silicone pad.

[0037] In the disclosed embodiment, the ends of each first extension portion 1302 and the ends of the second extension portion 1303 are respectively adhered to the circuit board 110 through a silicone pad. The silicone pad, as a soft and elastic material, is used as an adhesive between the bracket and the circuit board. It not only provides a good bonding effect, but also can buffer vibration and impact to a certain extent, protecting the circuit board from damage. During the assembly process, apply an appropriate amount of silicone to the end of the bracket and press it to the corresponding position on the circuit board. After the silicone is cured, the bracket is firmly adhered to the circuit board.

[0038] In a possible implementation, the width and the extension length of the second extension portion 1303 are both greater than those of the pressure sensor 120 .

[0039] In the disclosed embodiment, the width and extension length of the second extension portion 1303 are both larger than the pressure sensor 120. This ensures that the pressure sensor 120 can be stably mounted on the second extension portion 1303 without shaking or falling off due to size mismatch. Secondly, the larger size also provides a certain amount of protection space for the pressure sensor to prevent it from being damaged by external impact or collision.

[0040] Usually, 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 is a certain amount of space margin around it, thereby ensuring its stability and safety.

[0041] The present disclosure also provides a touch panel pressure detection method, which is applied to the touch controller of the touch panel described in any one of the above embodiments, see Figure 2 As shown, the method includes: In step S21, a touch track of the finger on the touch panel is determined according to a touch sensing signal received from the touch electrode layer; In the disclosed embodiment, the touch controller first receives touch sensing signals from the touch electrode layer. These signals usually contain information about the capacitance or resistance change caused by the movement of the finger on the touch pad. The touch electrode layer is composed of a plurality of tiny electrodes that can form an electric field network. When the finger approaches or touches the touch pad, the electric field distribution between these electrodes is changed, thereby generating a measurable signal change.

[0042] In order to determine the touch track 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 touch pad based on the strength, phase, frequency and other characteristic parameters of the received touch sensing signal. This calculation process may also involve signal filtering, denoising, interpolation, etc. to improve the accuracy and stability of position calculation.

[0043] As the finger moves on the touchpad, the touch controller continuously receives new touch sensing signals and updates the finger's position information in real time. These position information are connected in time sequence to form the touch track of the finger on the touchpad.

[0044] In step S22, 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.

[0045] In the disclosed embodiment, the touch controller obtains the touch track (ie, position information) of the finger on the touch panel, and then needs to determine the pressing force of the finger at each position on the touch track in combination with the pressure sensing signal received from the pressure sensor.

[0046] The only pressure sensor is usually installed below the touch panel or in close contact with the touch panel, and it can detect the pressing force transmitted through the first extension 1302 or the second extension 1303. When a finger presses the touch panel, 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.

[0047] In order to determine the pressing force of each touch position, the touch controller matches the position information on the touch track with the corresponding pressure sensing signal. For example, by looking up a table, the corresponding pressure of sliding, double-clicking, single-clicking, etc. is queried for each touch position when it is subjected to different pressure sensing signals, and the pressing force of the touch position is determined. Specifically, according to the timestamp of each position point on the touch track, the corresponding pressure sensing signal value is searched in the same time period. Then, the pressure sensing signal value is converted into a specific pressing force value using a calibration curve or a mathematical model.

[0048] In one possible implementation, see Figure 3 As shown, in step S22, determining the pressing force of the finger at each touch position on the touch track according to the touch track and the pressure sensing signal received from the pressure sensor includes: In step S2201, according to a first amplification ratio corresponding to a touch position farthest from the position of the pressure sensor in the touch track, the pressure sensing signal sensed by the pressure sensor at the farthest touch position is amplified; In the disclosed embodiment, the touch controller identifies the touch position farthest from the position of the pressure sensor in the touch track. Since the pressure sensor may not be able to directly and accurately sense the slight pressure change far away from its position, especially when the touch pad is large or the pressure sensor has limited sensitivity, it is necessary to amplify the pressure sensing signals at these positions.

[0049] In the disclosed embodiment, the touch controller amplifies the pressure sensing signal sensed by the pressure sensor at the farthest touch position according to a preset or dynamically calculated first amplification ratio. The amplification ratio may be determined based on a variety of factors such as the size of the touch panel, the sensitivity of the pressure sensor, the mechanical properties of the material, and experimental data.

[0050] Suppose that on a laptop touchpad, the user slides his finger from the upper left corner to the lower right corner and applies a click action on the lower right corner. Since the lower right corner is the position farthest from the pressure sensor in the touch track, the pressure sensing signal sensed by the pressure sensor at this position is amplified according to the first magnification ratio (for example, 1.5 times) preset for this farthest position. This is done to ensure that even at the farthest position, a weak pressing force can be accurately recognized. Among them, the amplification ratio of each position is determined according to its distance from the pressure sensor. Generally, the farther the distance from the sensor position, the smaller the ratio.

[0051] In step S2202, it is determined whether the amplified pressure sensing signal reaches a preset pressing force; In the disclosed embodiment, the amplified pressure sensing signal is compared to see whether it reaches a preset pressure threshold. The preset pressure threshold is set based on the application scenario of the device, user habits, operation feedback and other factors to distinguish whether the user intentionally applies a pressing action or merely performs a touch slide.

[0052] If the amplified pressure sensing signal reaches the preset pressure threshold, it is considered that the user has performed a valid pressing operation at that position; if it is not reached, the judgment may continue or it may be regarded as a normal touch slide or invalid operation.

[0053] Continuing with the laptop example above, assume that the preset pressure threshold is 100 units. If the amplified pressure sensing signal reaches or exceeds 100 units, it is considered that the user has performed a valid click operation at the lower right corner; if it is less than 100 units, it may be considered that the user has simply swiped past the position.

[0054] In step S2203, 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 trajectory.

[0055] In the disclosed embodiment, if the amplified pressure sensing signal of the farthest touch position reaches the preset pressure threshold, the pressure sensing signal sensed by the pressure sensor at each touch position on the touch track is amplified using the first amplification ratio determined previously. This is to ensure that the pressure of the finger can be accurately and consistently identified regardless of its position on the entire touch track.

[0056] Among them, a unified magnification ratio (i.e., the first magnification ratio) is used for processing, which simplifies calculation and improves efficiency. For example, in the case of a laptop computer, if it is confirmed that the user has performed a valid click operation at the lower right corner, then it will use the previously determined first magnification ratio (1.5 times) to amplify the pressure sensing signal at each position on the touch track. In this way, no matter how the user's finger moves and presses on the touchpad, the pressure at each position can be accurately identified.

[0057] In one possible implementation, the method further includes: In step S2204, when 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 relative to the position of the pressure sensor in the touch track, wherein the second amplification ratio is greater than the first amplification ratio; In the disclosed embodiment, if the pressure sensing signal of the farthest touch position after being amplified by the first amplification ratio still does not reach the preset pressure threshold, the second farthest touch position relative to the position of the pressure sensor in the touch track is found, and the second amplification ratio corresponding to the position is determined. Since the second farthest position is closer to the pressure sensor than the farthest position, its original pressure sensing signal should be stronger in theory, but for the sake of safety, the system will still use a larger amplification ratio (i.e., the second amplification ratio) to further amplify the pressure sensing signal at this position.

[0058] Among them, this second amplification ratio is set based on factors such as the size of the touch panel, the sensitivity of the pressure sensor, the mechanical properties of the material, and experimental data, and its value is greater than the first amplification ratio to ensure that even at the farthest or second farthest position, a weak pressing force can be accurately identified.

[0059] Continuing with the previous laptop example, suppose the user slides his 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 uses the first magnification ratio (1.5 times) to amplify the pressure sensing signal at the lower right corner, but finds that the amplified signal still does not reach the preset pressure threshold (100 units). Therefore, the system searches for the second farthest position and determines a larger second magnification ratio (for example, 2 times). Then, the second magnification ratio is used to re-amplify the pressure sensing signal at the lower right corner.

[0060] In step S2205, determining whether the amplified pressure sensing signal reaches the preset pressing force; In the disclosed embodiment, the pressure sensing signal amplified by the second amplification ratio is compared to see whether it reaches the preset pressure threshold. This process is similar to step S2202, but the signal processed by a larger amplification ratio is being evaluated.

[0061] Continuing with the above example, if the pressure sensing signal amplified by the second magnification ratio (2 times) reaches or exceeds the preset pressure threshold (100 units), it is considered that the user has performed a valid click operation at the lower right corner.

[0062] In step S2206, when 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 by the second amplification ratio to obtain the pressing force of each touch position of the finger on the touch track; In the disclosed embodiment, it is confirmed that the pressure sensing signal of the farthest touch position after being amplified by the second amplification ratio reaches the preset pressure threshold, and the pressure sensing signal of each touch position on the entire touch track is amplified by the second amplification ratio. This is done to ensure that the pressing force of the finger can be accurately and consistently identified regardless of its position during the entire touch process.

[0063] In the example of a laptop computer, if it is confirmed that the pressure sensing signal at the lower right corner after being amplified by the second magnification ratio (2 times) reaches the preset pressure threshold, the second magnification ratio is used to amplify the pressure sensing signal at each position on the touch track. In this way, no matter how the user's finger moves and presses on the touchpad, the system can accurately identify the pressure at each position.

[0064] In step S2207, when 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 relative to the position of the pressure sensor in the touch trajectory are performed in sequence according to the third amplification ratio corresponding to the farthest touch position relative to the position of the pressure sensor, and then determining whether the amplified pressure sensing signal reaches the preset pressing force, until the re-amplified pressure sensing signal reaches the preset pressing force, and 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.

[0065] In the disclosed embodiment, if the pressure sensing signal of the farthest touch position after being amplified by the second amplification ratio still does not reach the preset pressure threshold, it will continue to search backward along the touch track to determine the next touch position that is relatively closer to the pressure sensor but still "far end", and assign a larger amplification ratio (such as the third amplification ratio) to the position. This process will be repeated until the amplified pressure sensing signal reaches the preset pressure threshold.

[0066] On the laptop touchpad, the user slides his 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 at the lower right corner is amplified using the first magnification ratio and the second magnification ratio, but both fail to reach the preset pressure threshold (e.g., 100 units). At this point, the user continues to search backward along the touch track, and determines another position on the touch track that is relatively closer to the center of the touchpad but still "far away" (which can be called the "second farthest position"), and assigns a third magnification ratio (e.g., 2.5 times) to this position.

[0067] Amplify the pressure sensing signal of the "furthest position" using the third magnification ratio, and check again whether the amplified signal has reached the preset pressure threshold. If it has not yet reached, continue to find the next position and assign a larger magnification ratio until the condition is met. For example: After amplifying using the third magnification ratio (2.5 times), it is found that the pressure sensing signal at the lower right corner finally reaches the preset pressure threshold (100 units). At this point, it is considered that the user has performed a valid click operation at the lower right corner.

[0068] Amplify the pressure sensing signal of each touch position: Determine that the pressure sensing signal of the farthest (or second farthest, second farthest, etc.) touch position amplified by a certain amplification ratio (the third amplification ratio in this example) reaches the preset pressure threshold, and use this amplification ratio to amplify the pressure sensing signal of each touch position on the entire touch track. This ensures that the pressure of the finger can be accurately and consistently identified throughout the touch process, no matter where it is. In the example of a laptop touchpad, the system uses the third amplification ratio (2.5 times) to amplify the pressure sensing signal of each position on the touch track. In this way, no matter how the user's finger moves and presses on the touchpad, the pressure at each position can be accurately identified, thereby providing the user with a more accurate and smooth touch experience.

[0069] In one possible implementation, the method further includes: In step S2208, when the first amplified pressure sensing signal does not reach the preset pressing force, the pressure sensing signal corresponding to the second farthest touch position of the pressure sensor relative to the position of the pressure sensor is amplified by the first amplification ratio; In the disclosed embodiment, if the pressure sensing signal of the farthest touch position after being amplified using the first amplification ratio does not reach the preset pressing force threshold, then the second farthest touch position relative to the position of the pressure sensor in the touch trajectory is processed. The second farthest position refers to the touch point that is the second farthest from the pressure sensor except for 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 doing 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 recognized as a valid pressing force, so it is necessary to enhance the signal strength through amplification.

[0070] In the laptop touchpad scenario, the user slides his finger from the upper left corner to the lower right corner and applies a weak click action in the lower right corner. First try to amplify the pressure sensing signal at the farthest position (lower right corner), but find that the signal strength after amplification is still lower than the preset pressure threshold. Focus on the second farthest position and use the first amplification ratio (for example, 1.5 times) to amplify the pressure sensing signal at this position.

[0071] In step S2209, determining whether the amplified pressure sensing signal reaches the preset pressing force; In the disclosed embodiment, the pressure sensing signal at the second farthest position amplified by the first amplification ratio is compared to see whether it reaches the preset pressure threshold. This process is similar to the previous step, but the pressure sensing signal at the second farthest position amplified is being evaluated.

[0072] Continuing with the above example, if it is found that the pressure sensing signal at the second farthest position after being amplified using the first amplification ratio reaches a preset pressing force threshold (eg, 100 units), then the pressing operation at this position is considered to be valid.

[0073] In step S2210, when the amplified pressure sensing signal reaches the preset pressing force, the pressure sensing signal sensed by the pressure sensor at each of the touch positions except the farthest touch position is amplified by the first amplification ratio, and the pressure sensing signal obtained by amplifying the pressure sensing signal corresponding to the second farthest touch position is used as the pressure sensing signal of the farthest touch position, so as to obtain the pressing force of the finger at each touch position on the touch track; In the disclosed embodiment, the pressure sensing signal of the second farthest position after being amplified by the first amplification ratio reaches the preset pressure threshold, and the first amplification ratio is used to amplify the pressure sensing signal of each touch position except the farthest position on the entire touch track. This is because since the second farthest position can reach the preset pressure through the first amplification ratio, other positions (positions closer to the pressure sensor) can also accurately reflect the user's pressure through the same amplification ratio.

[0074] At the same time, the pressure sensing signal of the second farthest position after amplification is used as the pressure sensing signal of the farthest position. This is because in practical applications, the farthest position may cause serious signal attenuation due to being too far away from the pressure sensor, while the second farthest position is closer to the sensor and reaches the preset pressing force after amplification, so it can be used as a more reliable substitute.

[0075] In the example of a laptop touchpad, if it is confirmed that the pressure sensing signal after amplification at the second farthest position reaches the preset pressure threshold, then it will use the first amplification ratio (1.5 times) to amplify the pressure sensing signal at each position on the touch track except the lower right corner (the original farthest position). At the same time, the pressure sensing signal after amplification at the second farthest position is used as the pressure sensing signal at the lower right corner, because this ensures that the pressure of the finger can be accurately and consistently recognized regardless of its position during the entire touch process.

[0076] In step S2211, 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 does not reach the preset pressing force is amplified by the first amplification ratio, and the pressure sensing signal corresponding to the touch position where the pressure sensing signal after the amplification reaches the preset pressing force is amplified as the pressure sensing signal of the touch position where the amplified pressure sensing signal does not reach the preset pressing force, to obtain the pressing force of the finger at each touch position on the touch trajectory.

[0077] In the embodiment of the present disclosure, in the previous steps, an attempt has been made to amplify the pressure sensing signals of the farthest touch position and the second farthest touch position, and to check whether the amplified signals have reached the preset pressure threshold. Since the amplified pressure sensing signals have not reached the preset pressure, this process will continue until a touch position is found whose amplified pressure sensing signals can meet the preset pressure requirement.

[0078] In the disclosed embodiment, if the amplified pressure sensing signal of the second farthest touch position still does not reach the preset pressing force, the touch track will continue to search backward to determine the next touch position that is relatively closer to the pressure sensor but has not been checked (which can be called the "furthest position again"). Then, the pressure sensing signal at 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 touchpad scenario of a laptop computer, if the amplified pressure sensing signal at the second farthest position is still lower than the preset pressing force threshold, the next position on the touch track (i.e., the furthest position again) is searched, and the pressure sensing signal at this position is amplified using the first amplification ratio (e.g., 1.5 times).

[0079] In the disclosed embodiment, the amplified pressure sensing signal of the furthest position is compared to see whether it reaches the preset pressure threshold. If it reaches it, the search is stopped and the subsequent steps are continued; if it does not reach it, the next position is searched and the process of amplification and inspection is repeated.

[0080] If the pressure sensing signal of the farthest position after amplification reaches the preset pressure threshold (for example, 100 units), stop further searching and consider the pressing operation at this position to be valid. Amplify the touch positions except the unreached positions and update the pressure sensing signal of the unreached positions.

[0081] Once a touch position is found, and its amplified pressure sensing signal reaches the preset pressure threshold, the following operations are performed: Uniform amplification: using a first amplification ratio, amplify the pressure sensing signals of all touch positions except for those touch positions where the pressure sensing signals do not reach a preset pressure threshold after amplification.

[0082] Update the signal of the position that did not reach the standard: the amplified pressure sensing signal corresponding to the touch position that reaches the preset pressure threshold after this amplification is used as the pressure sensing signal of the touch position whose amplified pressure sensing signal still does not reach the preset pressure threshold. This step is based on an assumption: since the position farther away from the pressure sensor (such as the position that reaches the threshold this time) can reflect the effective pressure through amplification, the position closer to the sensor (i.e., the position that does not reach the standard) should also be able to reflect similar pressure at the same amplification ratio, although their original signals may be weaker.

[0083] If the amplified pressure sensing signal of the furthest position reaches the preset pressure threshold, the first amplification ratio (1.5 times) is used to amplify the pressure sensing signals of all positions on the touch track except those touch positions that still do not reach the preset pressure threshold after amplification. At the same time, the pressure sensing signal of the furthest position amplified again is used as the pressure sensing signal of those positions that do not reach the standard (such as the initial furthest position and the second furthest position).

[0084] This ensures that no matter where the finger is located on the entire touch track, its pressing force can be accurately and consistently recognized, thereby providing users with a more precise and smooth touch experience.

[0085] 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: In step S211, an electrical signal of a preset voltage is periodically sent to each driving electrode of the capacitive sensing point array in the touch electrode layer in sequence; In the disclosed embodiment, an electrical signal of a preset voltage is sent to each driving electrode in the capacitive sensing point array in sequence at a certain period (such as hundreds or thousands of times per second). This electrical signal is usually an alternating current (AC) signal, and its frequency and amplitude are preset to form a measurable capacitive field between the driving electrode and the receiving electrode.

[0086] Assume that the touch electrode layer contains a 100x100 array of capacitive sensing points, that is, 10,000 drive electrodes and a corresponding number of receiving electrodes. In the first cycle, an electrical signal with a preset voltage is sent to the first drive electrode, and then a period of time (usually a complete cycle of the electrical signal) is waited to allow the capacitive effect to stabilize. Next, the same operation is repeated to the second drive electrode, and so on, until all drive electrodes are traversed. This process is repeated in subsequent cycles to continuously monitor the capacitance changes on the touch panel.

[0087] In step S212, multiple charge change amounts of each receiving electrode for each driving electrode in the current cycle are determined according to the received charge amounts induced by the driving motor applying the electrical signal each time in the current cycle on each receiving electrode of the capacitive sensing point array and the pre-set reference charge amounts corresponding to each driving electrode; In the disclosed embodiment, in each cycle, when a driving electrode is activated (i.e., an electrical signal of a preset voltage is applied), the adjacent receiving electrode will sense the capacitance change caused by the approach or touch of a finger. This capacitance change will cause a corresponding charge change on the receiving electrode, and these charge changes can be indirectly obtained by measuring the current on the receiving electrode (because the current is the rate of change of charge over time).

[0088] In order to accurately determine the amount of charge change on each receiving electrode, the amount of received charge sensed by each receiving electrode when each driving electrode is activated is recorded and compared with a preset reference charge. The reference charge is the amount of charge 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 with the reference charge, the system can calculate the amount of charge change caused by the finger touch.

[0089] Continuing with the above example, when the first drive electrode is activated, the charge changes on all receiving electrodes are monitored simultaneously. Assume that the baseline charge sensed on a receiving electrode is Q0 when there is no finger touch. However, in actual measurement, due to the proximity or touch of a finger, the charge sensed on the receiving electrode changes to Q1. Then, the charge change △Q caused by the finger touch can be calculated by Q1 - Q0. This process is performed once for each receiving electrode when each drive electrode is activated, thereby generating a data set containing multiple charge changes that reflect the capacitance changes at different locations on the touch panel.

[0090] In step S213, a three-dimensional charge change array is constructed based on a plurality of charge change amounts corresponding to each receiving electrode in different periods, a driving coordinate of each driving electrode in the capacitive sensing point array, and a receiving coordinate of each receiving electrode in the capacitive sensing point array; In the disclosed embodiment, a three-dimensional charge change array is constructed by using the charge change collected from each receiving electrode when each driving electrode is activated, combined with the physical positions of the driving electrode and the receiving electrode in the capacitive sensing point array (i.e., the driving coordinates and the receiving coordinates). Each element of this three-dimensional array represents the charge change caused by the finger touch under a specific combination of driving electrodes and receiving electrodes.

[0091] Specifically, the dimensions of the three-dimensional charge change array usually correspond to the dimensions of the capacitance sensing point array. For example, if the capacitance sensing point array is a 100x100 grid, then the three-dimensional charge change array will also be a 100x100x100 cube.

[0092] In step S214, an axis charge change function is constructed along each axis direction of the three-dimensional charge change array, and based on the least squares method, the axis charge change function of each axis is fitted to obtain a touch charge change function, and the touch position of the finger on the touch panel is determined based on the touch charge change function.

[0093] In the disclosed embodiment, axial charge change functions are 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 charge change amount with position change in different axis directions.

[0094] These axis charge change functions are then fitted using mathematical methods such as the least squares method to find the function form that best describes the actual charge change data. The least squares method finds the best function match for the data by minimizing the sum of squares of the errors, thereby obtaining the touch charge change function.

[0095] Finally, the touch position of the finger on the touchpad is determined based on the fitted touch charge change function. This usually involves finding the extreme points or specific threshold points in the function that correspond to the maximum charge change caused by the finger touch, so that the touch position can be inferred.

[0096] For example: Assume that an axis charge change function is constructed in the X-axis direction, which describes the average charge change sensed by the receiving electrode at different X-coordinates. By fitting this function by the least squares method, a curve in the form of a quadratic function or a Gaussian function is obtained. The curve reaches a maximum value at a certain X-coordinate, and this maximum value corresponds to the touch position of the finger in the X-axis direction.

[0097] Similarly, similar operations 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, sending electrical signals multiple times in the same cycle can also represent the movement of the finger. Finally, the positions of different axes are combined to determine the two-dimensional touch position of the finger on the touchpad.

[0098] In one embodiment of the present disclosure, an electronic device is also provided, including: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement the steps of the method in any one of the aforementioned embodiments.

[0099] The embodiments of the present disclosure further provide a computer-readable storage medium having program codes stored thereon. When the program codes are executed by a processor, the steps and corresponding contents of the aforementioned embodiments can be implemented.

[0100] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments; within the technical concept of the present disclosure, various changes, modifications, substitutions and variations may be made to these embodiments, and these changes, modifications, substitutions and variations all fall within the protection scope of the present disclosure.

[0101] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction, which should also be regarded as the content disclosed by this disclosure. In order to avoid unnecessary repetition, this disclosure will not further explain various possible combinations. The technical scope of this 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 arranged below the circuit board, and includes a main body, and four first extensions extending from the four corners of the main body toward a direction away from the main body, a window is arranged in the middle area of ​​the main body, a second extension connected to any window edge of the main body is arranged in the window, the end of each first extension and the end of the second extension are respectively adhered to the circuit board, and the second extension is provided with a unique pressure sensor near the edge connected to the window; Wherein, a touch electrode layer is disposed on the upper surface of the circuit board, and the touch electrode layer is used to sense a touch sensing signal in response to an action of touching or pressing the touch panel, and output the touch sensing signal to the touch controller; The pressure sensor is used to deform when the pressing force generated when touching or pressing the touch panel is transmitted to the cantilever beam, and output a corresponding pressure sensing signal; The touch controller is used to determine a touch track of the finger on the touch panel based on a touch sensing signal received from the touch electrode layer, and to determine a 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: A screw column fixing point for fixing the bracket is provided at the connection between the main body and the four first extension parts.

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, characterized in that: The step of determining the pressing force of the finger at each touch position on the touch track according to the touch track and the pressure sensing signal received from the pressure sensor 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 track according to a first amplification ratio corresponding to the farthest touch position in the touch track; 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, characterized in that: The method further comprises: When 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 according to a second amplification ratio corresponding to the second farthest touch position relative to the position of the pressure sensor in the touch track, 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, the pressure sensing signal sensed by the pressure sensor at each touch position is amplified by the second amplification ratio to obtain the pressing force of each touch position of the finger on the touch track; In a case where 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 relative to the position of the pressure sensor in the touch trajectory, and determining whether the amplified pressure sensing signal reaches the preset pressing force are performed in sequence according to a third amplification ratio corresponding to the farthest touch position in the touch trajectory, until the re-amplified pressure sensing signal reaches the preset pressing force, and the pressure sensing signal sensed by the pressure sensor at each touch position is amplified respectively 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, characterized in that: The method further comprises: When the first amplified pressure sensing signal does not reach the preset pressing force, amplifying the pressure sensing signal corresponding to the second farthest touch position of the pressure sensor relative to 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, the pressure sensing signal sensed by the pressure sensor at each of the touch positions except the farthest touch position is amplified by the first amplification ratio, and the pressure sensing signal after the pressure sensing signal corresponding to the second farthest touch position is amplified is used as the pressure sensing signal of the farthest touch position, so as 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 where the pressure sensor is located 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 does not reach the preset pressing force is amplified by the first amplification ratio, and the pressure sensing signal corresponding to the touch position corresponding to the preset pressing force after the pressure sensing signal amplified this time is amplified as the pressure sensing signal of the touch position corresponding to the amplified pressure sensing signal does not reach the preset pressing force, so as to obtain 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, characterized in that: 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; Determine multiple charge changes of each receiving electrode for each driving electrode in the current cycle according to the received charge amount induced by the driving motor applying the electrical signal each time in the current cycle on each receiving electrode of the capacitive sensing point array and the pre-set 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 each receiving electrode in different periods, a driving coordinate of each driving electrode in the capacitive sensing point array, and a receiving coordinate of each receiving electrode 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 based on the least squares method, the axis charge change function of each axis is fitted to obtain a touch charge change function, and the touch trajectory of the finger on the touch panel is determined according to 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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