Touch product triggering device and method and electronic touch equipment

Abstract

The invention discloses a touch product triggering device, which is applied to the technical field of capacitive touch and comprises a protection electrode, a capacitive sensor and an MCU (Microprogrammed Control Unit). The protection electrode provides a potential equal to the capacitance type sensor and transmits a sensed first signal representing the equivalent self-capacitance change of the protection electrode to the MCU, and the capacitance type sensor only detects the change of the equivalent capacitance of the capacitance type sensor and transmits a second signal of detection data to the MCU. And the MCU judges whether a touch function is triggered or not according to the first signal and the second signal. When water drops drop on the touch surface of the touch product, the protection electrode and the capacitive sensor have the same potential, and the water drops and the environment have the same potential, so that the influence of the water drops on the change of the equivalent capacitance of the capacitive sensor can be nearly ignored. Meanwhile, the condition for triggering the touch product is comprehensively judged based on the detection results of the first signal and the second signal, and the problem of mistaken touch caused by the fact that conductors such as water drops drop on the capacitive touch product is further avoided.

Description

Technical Field

[0001] The present invention relates to the field of capacitive touch technology, and in particular to a touch product triggering device, method and electronic touch equipment. Background Art

[0002] Capacitive touch products have outstanding advantages such as aesthetics, waterproofness, and dustproofness. In addition to being widely used in tablets, mobile phones, home appliances, etc., capacitive touch products are also used in the automotive field, bringing about a revolution in automotive switches. Currently, capacitive touch products basically use a capacitive film attached to the back of plastic parts to detect finger touch. Finger touch can change the capacitance value of the capacitive film, thereby affecting the electrical signal detected by the detection circuit, and generate an ON / OFF state after being processed by the microcontroller unit (MCU) and software.

[0003] In actual use, water droplets or other conductors dripping on capacitive touch products will also cause changes in capacitance values, thereby causing false touches of capacitive touch products.

[0004] Therefore, there is an urgent need to adopt a method to reduce or eliminate the false touch problem caused by conductor drops such as water droplets on capacitive touch products. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a touch product triggering device, method and electronic touch device to reduce or eliminate the problem of false touch caused by conductor drops such as water droplets on capacitive touch products. The specific scheme is as follows:

[0006] In the first aspect, the present application provides a touch product trigger device, comprising: a data acquisition module and an MCU;

[0007] The data acquisition module includes: a pair of protective electrodes and capacitive sensors, wherein the protective electrodes and the capacitive sensors are both arranged between the electrode attachment and support material and the covering protective layer;

[0008] The guard electrode surrounds the capacitive sensor and is used to provide a potential equipotential to the capacitive sensor and transmit a sensed first signal representing a change in equivalent capacitance of the guard electrode to the MCU;

[0009] The capacitive sensor is used to transmit a sensed second signal representing a change in equivalent capacitance of the capacitive sensor to the MCU;

[0010] The MCU is connected to both the guard electrode and the capacitive sensor, and is used to provide a voltage-stabilizing source with equal potential for the capacitive sensor and the guard electrode, and to determine whether to trigger a touch function according to the first signal and the second signal.

[0011] Optionally, the capacitive sensor is a self-capacitive sensor, and the self-capacitive sensor is used to transmit a sensed second signal representing a change in equivalent self-capacitance to the MCU.

[0012] Optionally, the capacitive sensor is a mutual capacitance sensor, and the mutual capacitance sensor includes: a Tx electrode and an Rx electrode;

[0013] The Tx electrode is a transmitting electrode, and the Rx electrode is a receiving electrode. The two electrodes are coupled to form mutual capacitance, and the sensed second signal representing the change of equivalent mutual capacitance is transmitted to the MCU.

[0014] Optionally, the capacitive sensor is a self-capacitance sensor and a mutual-capacitance sensor;

[0015] The self-capacitance sensor is used to transmit a sensed second self-capacitance signal representing an equivalent self-capacitance change of the self-capacitance sensor to the MCU;

[0016] The mutual capacitance sensor is used to transmit a sensed second mutual capacitance signal representing a change in equivalent mutual capacitance of the mutual capacitance sensor to the MCU;

[0017] The MCU scans the self-capacitance sensor and the mutual-capacitance sensor alternately at a fixed duty cycle.

[0018] Optionally, the capacitive sensor is connected to a signal terminal that sends a fixed sequence charge and discharge signal.

[0019] In a second aspect, the present application provides a touch product triggering method, comprising:

[0020] Acquire a first signal representing a change in the equivalent self-capacitance of the guard electrode and a second signal representing a change in the equivalent capacitance of the capacitive sensor;

[0021] Whether a touch function is triggered is determined according to the first signal and the second signal.

[0022] Optionally, determining whether to trigger a touch function according to the first signal and the second signal includes:

[0023] detecting the first signal transmitted by the guard electrode;

[0024] If the first signal meets a first condition, the second signal transmitted by the capacitive sensor is detected, wherein the first condition is that the increase in the equivalent capacitance of the protection electrode reflected by the first signal is less than a first threshold value, and the increase in the equivalent capacitance of the protection electrode is not negative;

[0025] If the second signal meets a second condition, a touch product function is triggered, where the second condition is a comparison result between an equivalent capacitance of the capacitive sensor reflected by the second signal and a baseline;

[0026] If the first signal does not satisfy the first condition or the second signal does not satisfy the second condition, it is determined that the current touch operation is an incorrect touch operation.

[0027] Optionally, the baseline is a time-related variable;

[0028] When the second signal is maintained for a time period exceeding a time threshold, the baseline approaches a value of the second signal.

[0029] Optionally, also include:

[0030] If it is detected that the first signal indicates that the equivalent capacitance of the protection electrode is reduced, the current round of detection is stopped and the process returns to the step of obtaining the first signal.

[0031] In a third aspect, the present application provides an electronic touch device, including the touch product triggering device.

[0032] It can be seen that the protective electrode described in the present application provides a potential equipotential to the capacitive sensor and transmits the sensed first signal representing the change in the equivalent capacitance of the protective electrode to the MCU. The capacitive sensor only detects the change in its own equivalent capacitance and transmits the detection data second signal to the MCU. The MCU determines whether to trigger the touch function based on the first signal and the second signal. When water droplets fall on the touch surface of the touch product, since the protective electrode is passed the same electrical signal as the capacitive sensor, the protective electrode has the same potential as the capacitive sensor, and the water droplets are equipotential to the environment. Therefore, the effect of water droplets on the change in the equivalent capacitance of the capacitive sensor can be almost ignored. At the same time, the conditions for triggering the touch product are comprehensively judged based on the detection results of the first signal and the second signal, further avoiding the problem of false touch caused by conductors such as water droplets dripping on the capacitive touch product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 A structural diagram of a touch product trigger device provided in an embodiment of the present application;

[0035] Figure 2A self-capacitive schematic diagram of a capacitive sensor provided for related technology;

[0036] Figure 3 A schematic diagram of the self-capacitance of a capacitive sensor when touched by a finger provided for related technology;

[0037] Figure 4 A schematic diagram of mutual capacitance of a capacitive sensor provided for related technology;

[0038] Figure 5 A schematic diagram of mutual capacitance when a capacitive sensor is touched by a finger provided for related technologies;

[0039] Figure 6 A touch detection flow chart provided in an embodiment of the present application;

[0040] Figure 7 A touch detection flow chart provided in an embodiment of the present application;

[0041] Figure 8 A detection diagram of a touch product trigger device provided in an embodiment of the present application;

[0042] Fig. 9 A detection diagram of a touch product trigger device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] 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.

[0044] The core of this application is to provide a touch product triggering device.

[0045] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] Capacitive touch products have outstanding advantages such as aesthetics, waterproofness, and dustproofness. In addition to being widely used in tablets, mobile phones, home appliances, etc., capacitive touch products are also used in the automotive field, bringing about a revolution in automotive switches. Currently, capacitive touch products basically use a capacitive film attached to the back of plastic parts to detect finger touch. Finger touch can change the capacitance value of the capacitive film, thereby affecting the electrical signal detected by the detection circuit, and generate an ON / OFF state after being processed by the MCU and software.

[0047] In actual use, water droplets or other conductors dripping on capacitive touch products will also cause changes in capacitance values, thereby causing false touches of capacitive touch products.

[0048] Therefore, there is an urgent need to adopt a method to reduce or eliminate the false touch problem caused by conductor drops such as water droplets on capacitive touch products.

[0049] See also Figure 1 As shown, to solve the above problems, the present embodiment discloses a touch product trigger device, comprising: a data acquisition module and an MCU;

[0050] The data acquisition module includes: a pair of protective electrode shiled and a capacitive sensor, wherein the protective electrode shiled and the capacitive sensor are both arranged between the electrode attachment and support material and the covering protective layer;

[0051] The protection electrode shiled surrounds the capacitive sensor and is used to provide a potential equipotential to the capacitive sensor and transmit the sensed first signal representing the change of the equivalent self-capacitance of the protection electrode shiled to the MCU;

[0052] The capacitive sensor is used to transmit the sensed second signal representing the equivalent capacitance change of the capacitive sensor to the MCU;

[0053] The MCU is connected to both the protection electrode shiled and the capacitive sensor, and is used to provide a voltage stabilizing source with equal potential for the capacitive sensor and the protection electrode shiled, and to determine whether to trigger the touch function according to the first signal and the second signal.

[0054] like Figure 1 As shown, the data acquisition module includes a pair of protective electrode shiled and capacitive sensor, the inner circle of the device is the capacitive sensor, and the outer circle of the device is the protective electrode shiled. The protective electrode shiled is connected to a voltage source with the same potential as the capacitive sensor, and has the function of detecting the change of its own equivalent self-capacitance, and provides a first signal to the MCU.

[0055] When water drops fall on the touch surface of the touch product and are within the potential range provided by the protective electrode shiled, the water drops and the environment are at the same potential, and the water drops will not cause changes in the equivalent capacitance of the capacitive sensor. Therefore, this embodiment makes the impact of the droplets on the capacitive sensor smaller than that of the ground conductor.

[0056] In a specific implementation, a reasonable distance needs to be maintained between the protective electrode shiled and the capacitive sensor. It is generally recommended that the distance be greater than 1 cm to avoid touching the protective electrode shiled and the capacitive sensor electrode at the same time when the finger is pressed. If the protective electrode shiled and the capacitive sensor are triggered at the same time, it is considered to be an accidental touch of a large area of ​​water, and the touch function of the touch product will not be triggered.

[0057] In a specific implementation, the covering protective layer is usually an insulating material, which can prevent external static electricity, leakage, etc. from damaging the internal circuit. In a dry environment, static electricity is easily generated. If the protective layer is not insulated, the static electricity may be directly transmitted to the sensitive circuit part of the sensor, breakdown of electronic components, and damage to the sensor. At the same time, capacitive sensors work by detecting changes in capacitance. If the protective layer is conductive, it may change the electric field distribution around the sensor, resulting in false triggering. For example, when the human body or other conductive objects are close to the non-insulating protective layer, additional capacitive coupling may be generated, causing the sensor to think it is a normal touch operation and generate an erroneous signal. In some special cases, even if the covering protective layer is not completely insulating, the normal operation of the capacitive sensor can be guaranteed by appropriate design and shielding measures.

[0058] It is understandable that there may be multiple data acquisition modules on the touch surface of a touch product, and different data acquisition modules are connected to the same MCU.

[0059] It can be seen that in the embodiment of the present application, the protective electrode shiled provides a potential equipotential to the capacitive sensor and transmits the sensed first signal representing the change in the equivalent self-capacitance of the protective electrode shiled to the MCU, while the capacitive sensor only detects the change in its own equivalent capacitance and transmits the detection data second signal to the MCU, and the MCU determines whether to trigger the touch function based on the first signal and the second signal. When water drops fall on the touch surface of the touch product, since the protective electrode shiled has the same potential as the capacitive sensor, the water droplets and the environment have the same potential, so the effect of the water droplets on the change in the equivalent capacitance of the capacitive sensor can be almost ignored. At the same time, the conditions for triggering the touch product are comprehensively judged based on the detection results of the first signal and the second signal, further avoiding the problem of false touch caused by water droplets and other conductors dripping on the capacitive touch product.

[0060] According to the above embodiment, this embodiment provides a specific solution, in which the capacitive sensor is a self-capacitive sensor, and the self-capacitive sensor is used to transmit the sensed second signal representing the change of equivalent self-capacitance to the MCU.

[0061] The touch surface of the self-capacitive sensor is circular, and the protective electrode shiled is in a ring shape and surrounds the self-capacitive sensor at an equal distance from the self-capacitive sensor.

[0062] like Figure 2 As shown in the figure, self-capacitance refers to the capacitance between the capacitive sensor and the equivalent ground, overlay is the covering protective layer, printed circuit board (PCB) is the attachment and support material of the electrode, and ground hatch is the equivalent environment ground. Figure 3 As shown, since the finger potential is equivalent to the ground, the inductive capacitance between the finger and the capacitive sensor and the self-capacitive sensor are connected in parallel, and the equivalent capacitance becomes larger. When water drops fall on the touch sensor, since the water drops and the environment are in equivalent contact with the ground, the inductive capacitance between the water drops and the self-capacitive sensor and the self-capacitive sensor are connected in parallel, and the equivalent capacitance also becomes larger. When the equivalent capacitance of the self-capacitive sensor caused by the water drops increases and exceeds the threshold, it will cause false touches of the touch product.

[0063] In a specific implementation, the same electrical signal as the self-capacitive sensor is transmitted to the protective electrode shiled to ensure that the protective electrode shiled circle has the same potential as the self-capacitive sensor. When water droplets fall on the self-capacitive sensor, the water droplets will not cause changes in the equivalent capacitance of the self-capacitive sensor due to the absence of a potential difference. Therefore, after the protective electrode shiled is transmitted with the same electrical signal as the self-capacitive sensor, accidental touch by small water droplets is avoided.

[0064] In another specific implementation, the water drop triggers the protective electrode shiled and the self-capacitive sensor at the same time. In this case, it is considered as an accidental touch of a large area of ​​water, and the touch function of the touch product is not triggered.

[0065] It can be seen that in this embodiment, the protective electrode shiled provides a potential equipotential to the self-capacitive sensor and transmits the first signal inductively representing the change in equivalent capacitance of the protective electrode shiled to the MCU. The self-capacitive sensor only detects the change in its own equivalent capacitance and transmits the second signal of the detection data to the MCU. The MCU determines whether to trigger the touch function based on the first signal transmitted by the protective electrode shiled and the second signal transmitted by the self-capacitive sensor. When water drops fall on the touch surface of the touch product, since the protective electrode shiled passes the same electrical signal as the self-capacitive sensor, the protective electrode shiled circle has the same potential as the self-capacitive sensor, and the water drops are equipotential to the environment. Therefore, the water drops will not cause changes in the equivalent capacitance of the self-capacitive sensor, thereby avoiding the problem of false touch caused by water drops and other conductors dripping on the capacitive touch product.

[0066] In order to reduce the impact of the environment on the capacitive sensor, according to the above embodiment, this embodiment provides a specific solution, the capacitive sensor is a mutual capacitance sensor, such as Figure 4 As shown, the mutual capacitance sensor includes: a Tx electrode and an Rx electrode;

[0067] The Tx electrode is a transmitting electrode, and the Rx electrode is a receiving electrode. The two electrodes are coupled to form mutual capacitance, and the sensed second signal representing the change in equivalent mutual capacitance is transmitted to the MCU.

[0068] like Figure 5 As shown. Since the Tx electrode and the Rx electrode are small in size and close in distance, when a finger touches the touch surface of the product, the finger touches the Tx electrode and the Rx electrode at the same time. At this time, since the finger absorbs part of the charge, the mutual capacitance between the Tx electrode and the Rx electrode decreases. There are many situations in which water droplets touch the touch surface of the touch product.

[0069] In a specific implementation, when the water drop only contacts the Rx electrode or the Tx electrode, an induced capacitor is formed between the water drop and the Rx electrode or the Tx electrode, and the mutual capacitance between the Rx electrode and the Tx electrode is reduced. In the embodiment of the present application, a protective electrode shiled is added to the mutual capacitance detection module, and the protective electrode shiled has an electric potential equal to that of the Tx electrode. Since the water drop is equal to the environment, the influence of the water drop on the mutual capacitance between the Rx electrode and the Tx electrode when the water drop only contacts the Rx electrode or the Tx electrode is eliminated.

[0070] In another specific implementation, the water drop triggers the protective electrode shiled and the self-mutual capacitance sensor at the same time. In this case, it is considered to be an accidental touch of a large area of ​​water, and the touch function of the touch product is not triggered.

[0071] It can be seen that the capacitive sensor in the embodiment of the present application is a mutual capacitance sensor, and the protective electrode shiled provides a potential equipotential to the Tx electrode. Therefore, the water droplets falling on the touch surface of the touch product are equipotential to the environment, thereby reducing the influence of the water droplets on the mutual capacitance between the Tx electrode and the Rx electrode when they only contact the Tx electrode or the Rx electrode.

[0072] In order to further improve the measurement accuracy of the capacitive sensor, according to the above embodiment, this embodiment provides a specific solution, the capacitive sensor is a self-capacitive sensor and a mutual-capacitive sensor;

[0073] The self-capacitance sensor is used to transmit the sensed second self-capacitance signal representing the equivalent self-capacitance change of the self-capacitance sensor to the MCU;

[0074] The mutual capacitance sensor is used to transmit the sensed second mutual capacitance signal representing the equivalent mutual capacitance change of the mutual capacitance sensor to the MCU;

[0075] The MCU scans the self-capacitance sensor and the mutual-capacitance sensor alternately with a fixed duty cycle.

[0076] In this embodiment, the data acquisition module includes three electrodes, namely, an Rx electrode, a Tx electrode and a protective electrode shiled. The Rx electrode is tested for self-capacitance or mutual capacitance. If the self-capacitance and mutual capacitance are detected at the same time, one of the detections will cause serious signal interference to the other detection. For example, during the self-capacitance detection process, the MCU applies an excitation signal to the Rx electrode to measure its self-capacitance. This excitation signal will generate an electric field around the receiving electrode, and this electric field may interfere with the mutual capacitance measurement between the Rx electrode and the Tx electrode. Because the mutual capacitance measurement relies on the relatively stable electric field coupling between the Rx electrode and the Tx electrode, additional electric field interference will cause deviations in the measured value of the mutual capacitance. Therefore, the MCU alternately scans the self-capacitance sensor and the mutual capacitance sensor with a fixed duty cycle. For example, in every 1s, the mutual capacitance is scanned 4 times and the self-capacitance is scanned 1 time.

[0077] It is understandable that self-capacitance detection is mainly sensitive to changes in the electrode's own capacitance, while mutual capacitance detection focuses on changes in the coupling of capacitance between two electrodes. During touch detection, a finger approaching or touching an electrode will cause changes in both self-capacitance and mutual capacitance. By alternately detecting changes in mutual capacitance and self-capacitance, more comprehensive touch information can be obtained. At the same time, changes in mutual capacitance can provide relative information about the touch position between different electrode pairs, while changes in self-capacitance can further refine the judgment of the touch position. For some complex touch operations, such as multi-touch or proximity touch, combining the detection results of the two can more accurately locate the position of the touch point.

[0078] In order to detect the capacitance value of the capacitive sensor, according to the above embodiment, this embodiment provides a specific solution, in which the capacitive sensor is connected to a signal terminal that sends a fixed sequence charge and discharge signal.

[0079] The self-capacitance sensor and mutual-capacitance sensor are scanned, and the capacitor is charged in a fixed sequence during the scan. During the self-capacitance scan, the Rx electrode is connected to a fixed sequence of charge and discharge signals to detect changes in the self-capacitance; during the mutual-capacitance scan, the Tx electrode is connected to a fixed sequence of charge and discharge signals, and the Rx electrode is used to receive the electrical signal emitted by the Tx electrode to detect changes in the mutual-capacitance.

[0080] It can be seen that this embodiment saves usage costs by performing self-capacitance and mutual-capacitance detection in different time periods and reusing electrodes during self-capacitance and mutual-capacitance detection.

[0081] See also Figure 6 This embodiment discloses a touch product triggering method, which is applied to the above-mentioned touch product triggering device, including:

[0082] Step S11, obtaining a first signal representing a change in the equivalent self-capacitance of the protective electrode shiled and a second signal representing a change in the equivalent capacitance of the capacitive sensor.

[0083] The MCU is connected to both the protection electrode shiled and the capacitive sensor. During self-capacitance scanning, a fixed sequence of charge and discharge signals is passed through the Rx electrode to receive a first signal representing a change in equivalent capacitance of the protection electrode shiled. During mutual capacitance scanning, a fixed sequence of charge and discharge signals is passed through the Tx electrode, and the Rx electrode is used to receive the electrical signal emitted by the Tx electrode to receive a second signal representing a change in equivalent capacitance of the capacitive sensor.

[0084] Step S12: determining whether the touch function is triggered according to the first signal and the second signal.

[0085] It is understandable that the capacitive sensor is set in the effective touch area, that is, the operating position of the touch product, and the protective electrode shiled and the data acquisition module are separated by a certain distance. The finger operation cannot touch the protective electrode shiled and the capacitive sensor at the same time. Therefore, when the self-capacitance of the protective electrode shiled changes significantly, the touch event is determined to be an erroneous operation. When the first signal change is within the preset range and the second signal meets the preset conditions, the touch function is triggered.

[0086] See also Figure 7 According to the above embodiment, this embodiment provides a specific method, and judging whether to trigger the touch function according to the first signal and the second signal includes:

[0087] Step S21, detecting a first signal transmitted by the protection electrode shiled.

[0088] Step S22: If the first signal meets the first condition, the second signal transmitted by the capacitive sensor is detected, and the first condition is: the increase in the equivalent capacitance of the protective electrode shiled reflected by the first signal is less than the first threshold, and the increase in the equivalent capacitance of the protective electrode shiled is not negative.

[0089] It can be understood that the capacitive sensor is set in the touch effective area, that is, the operating position of the touch product, and the protective electrode shiled and the data acquisition module are separated by some distance. Finger operation cannot touch the protective electrode shiled and the capacitive sensor at the same time. Therefore, when the first signal self-capacitance change representing the equivalent capacitance change of the protective electrode shiled changes significantly, the water droplet accidental touch can be directly ruled out.

[0090] Step S23: If the second signal meets the second condition, the touch product function is triggered, and the second condition is the comparison result of the equivalent capacitance of the capacitive sensor reflected by the second signal and the baseline baseline; if the first signal does not meet the first condition or the second signal does not meet the second condition, it is determined that the current touch operation is a false touch operation.

[0091] The self-capacitance sensor and the mutual-capacitance sensor are scanned. During the scan, the capacitor is charged in a fixed sequence. The charged voltage is compared with the reference voltage by a comparator. When there is no influence of fingers and water drops, the raw value of the number of charging times will have a reference value. When fingers or water drops affect the self-capacitance and mutual capacitance, the raw value of the number of charging times of the capacitor will also change. The changes in self-capacitance and mutual capacitance caused by fingers and water drops are different, thereby reducing false touches caused by water drops. In a specific implementation, the self-capacitance sensor and the mutual-capacitance sensor can be the same device.

[0092] In order to adapt to measurement events in different environments and device states, according to the above embodiment, this embodiment provides a specific solution, where the baseline is a time-related variable;

[0093] When the duration of the second signal exceeds the time threshold, the baseline approaches the value of the second signal.

[0094] In a specific embodiment, the capacitive sensor is a self-capacitive sensor. Since the self-capacitance is more easily affected by changes in the environment around the electrode, when the second signal is maintained at a fixed value, the fluctuation amplitude does not exceed the preset error, and the duration is greater than the time threshold, the first baseline baseline is adjusted according to the current stable self-capacitance value, so that the first baseline baseline shows an asymptotic change and gradually approaches the value of the second signal within a given time period, so as to adapt to environmental changes to a certain extent.

[0095] In another specific embodiment, the capacitive sensor is a mutual capacitance sensor. When the second signal is maintained at a fixed value, the fluctuation amplitude does not exceed a preset error, and the duration is greater than a time threshold, the second baseline baseline follows the second signal, and the second baseline baseline presents an asymptotic change, gradually approaching the value of the second signal within a given time period to adapt to measurement events in different environments and device states.

[0096] In a third specific implementation, the capacitive sensors are self-capacitance sensors and mutual-capacitance sensors. In addition to the fact that their respective baselines can be dynamically adjusted, when the self-capacitance sensor detects the presence of a water droplet false touch, the second baseline of the mutual-capacitance sensor is immediately reset to the value of the second signal. For example, two self-capacitance thresholds are calibrated, threshold A is about 80% of the raw value of the number of charges when the self-capacitance is not touched and there are no water droplets, and threshold B is about 120% of the raw value of the number of charges when the self-capacitance is touched. It is necessary to ensure that A>B, and the raw value of the number of charges when there are water droplets is between A and B. When the raw value of the self-capacitance charge times is between thresholds A and B for a long time, the baseline of the mutual-capacitance is reset to the current raw value of the mutual-capacitance charge times, so as to avoid mutual-capacitance false touches caused by the removal of water droplets.

[0097] In order to further reduce the error, according to the above embodiment, this embodiment provides a specific solution, which also includes:

[0098] If it is detected that the first signal represents that the equivalent capacitance of the guard electrode shiled is reduced, then the current round of detection is stopped and the process returns to the step of obtaining the first signal.

[0099] Since errors are unavoidable in the measurement data, when the first signal indicates that the equivalent capacitance of the guard electrode shiled decreases, it is determined that there is an error in the first signal value, and the step of obtaining the first signal is returned to improve the measurement accuracy.

[0100] In order to make the working principle of the present application more clear to those skilled in the art, the second signal detection diagrams collected under different situations will be described in detail below, and the second signal is represented by the raw value of the number of charging times when the capacitance of the capacitive sensor is fully charged.

[0101] Figure 8 This is a self-capacitive touch product trigger device detection diagram provided in an embodiment of the present application, where the vertical axis is the raw value of the self-capacitive charging times, and the horizontal axis is time. Figure 8 As shown in the figure, the self-capacitive sensor can detect three situations: touch under dry conditions (Dry Condition Touch), water droplet touch (Water Droplet) and touch when water droplets exist (Water DropletTouch).

[0102] In the first case, when the touch is performed under dry conditions, the raw value of the self-capacitance charging times decreases and the self-capacitance sensor is triggered.

[0103] In the second case, when water drops touch, the raw value of the self-capacitance charging times changes irregularly, and the decrease in the raw value of the self-capacitance charging times is smaller than when touching under dry conditions.

[0104] In the third case, when water droplets are present and the sensor is touched, the raw value of the self-capacitance charging times stabilizes when the water droplets touch the sensor, and the raw value of the self-capacitance charging times decreases further, causing the self-capacitance sensor to be triggered.

[0105] Fig. 9 This is a detection diagram of a mutual capacitance touch product trigger device provided in an embodiment of the present application, where the vertical axis is the raw value of the mutual capacitance charging times, and the horizontal axis is time. Fig. 9 As shown, the orange line is the second signal line and the green line is the reference line. The mutual capacitance sensor can detect five situations: finger touch, liquid droplet on the Tx electrode and the grounded shield hatch, liquid droplet on the Tx electrode and the Rx electrode at the same time, finger touch when there is liquid droplet on the Tx electrode and the Rx electrode, and liquid drop removed from the Tx electrode and the Rx electrode.

[0106] In the first case, when a finger touches the surface, the mutual capacitance decreases greatly, and the gap between the orange second signal line and the green baseline is large, triggering the touch function.

[0107] In the second case, the droplet contacts the Tx electrode and the guard electrode shiled. At this time, due to the existence of the shiled electrode, the change in mutual capacitance is small and is not enough to trigger the touch function.

[0108] In the third case, the droplet contacts the Tx electrode and the Rx electrode at the same time. At this time, the water droplet generates inductive capacitance between the Rx electrode and the Tx electrode, which is equivalent to connecting two inductive capacitances in series and in parallel with the original mutual capacitance. At this time, the water droplet increases the equivalent mutual capacitance between the Rx electrode and the Tx electrode, and the raw value of the charging times decreases. After the water droplet stays for a long time, the green baseline changes with the orange second signal line.

[0109] The fourth case is when there are only droplets on the Tx electrode and the Rx electrode. The finger also reduces the equivalent mutual capacitance, and the raw value of the number of charging times increases.

[0110] In the fifth case, when the water droplets are removed from the Tx electrode and the Rx electrode, the equivalent mutual capacitance between the Rx electrode and the Tx electrode becomes smaller, similar to the mutual capacitance reduction process caused by finger touch, thus causing false touch. At this time, it is necessary to cooperate with the force sensor to detect the touch signal applied to the touch product to avoid false touch.

[0111] Finally, this embodiment provides an electronic touch device, including the above-mentioned touch product triggering device.

[0112] The above is a detailed introduction to a touch product trigger device, method and electronic touch device provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can refer to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0113] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A touch product triggering device, characterized in that: include: Data acquisition module and MCU; The data acquisition module includes: a pair of protective electrodes and capacitive sensors, wherein the protective electrodes and the capacitive sensors are both arranged between the electrode attachment and support material and the covering protective layer; The guard electrode surrounds the capacitive sensor and is used to provide a potential equipotential to the capacitive sensor and transmit a sensed first signal representing a change in equivalent capacitance of the guard electrode to the MCU; The capacitive sensor is used to transmit a sensed second signal representing a change in equivalent capacitance of the capacitive sensor to the MCU; The MCU is connected to both the guard electrode and the capacitive sensor, and is used to provide a voltage-stabilizing source with equal potential for the capacitive sensor and the guard electrode, and to determine whether to trigger a touch function according to the first signal and the second signal.

2. The touch product triggering device according to claim 1, characterized in that: The capacitive sensor is a self-capacitive sensor, and the self-capacitive sensor is used to transmit a sensed second signal representing a change in equivalent self-capacitance to the MCU.

3. The touch product triggering device according to claim 1, characterized in that: The capacitive sensor is a mutual capacitance sensor, and the mutual capacitance sensor includes: a Tx electrode and an Rx electrode; The Tx electrode is a transmitting electrode, and the Rx electrode is a receiving electrode. The two electrodes are coupled to form mutual capacitance, and the sensed second signal representing the change of equivalent mutual capacitance is transmitted to the MCU.

4. The touch product triggering device according to claim 1, characterized in that: The capacitive sensor is a self-capacitive sensor and a mutual-capacitive sensor; The self-capacitance sensor is used to transmit a sensed second self-capacitance signal representing an equivalent self-capacitance change of the self-capacitance sensor to the MCU; The mutual capacitance sensor is used to transmit a sensed second mutual capacitance signal representing a change in equivalent mutual capacitance of the mutual capacitance sensor to the MCU; The MCU scans the self-capacitance sensor and the mutual-capacitance sensor alternately at a fixed duty cycle.

5. The touch product triggering device according to any one of claims 1 to 4, characterized in that: The capacitive sensor is connected to a signal terminal that sends a fixed sequence charge and discharge signal.

6. A touch product triggering method, applied to the touch product triggering device according to any one of claims 1 to 5, characterized in that: include: Acquire a first signal representing a change in the equivalent self-capacitance of the guard electrode and a second signal representing a change in the equivalent capacitance of the capacitive sensor; Whether a touch function is triggered is determined according to the first signal and the second signal.

7. The touch product triggering method according to claim 6, characterized in that: Determining whether to trigger a touch function according to the first signal and the second signal includes: detecting the first signal transmitted by the guard electrode; If the first signal meets a first condition, the second signal transmitted by the capacitive sensor is detected, wherein the first condition is that the increase in the equivalent capacitance of the protection electrode reflected by the first signal is less than a first threshold value, and the increase in the equivalent capacitance of the protection electrode is not negative; If the second signal meets a second condition, a touch product function is triggered, where the second condition is a comparison result between an equivalent capacitance of the capacitive sensor reflected by the second signal and a baseline; If the first signal does not satisfy the first condition or the second signal does not satisfy the second condition, it is determined that the current touch operation is an incorrect touch operation.

8. The touch product triggering method according to claim 7, characterized in that: The baseline is a time-dependent variable; When the second signal is maintained for a time period exceeding a time threshold, the baseline approaches a value of the second signal.

9. The touch product triggering method according to claim 7, characterized in that: Also includes: If it is detected that the first signal indicates that the equivalent capacitance of the protection electrode is reduced, the current round of detection is stopped and the process returns to the step of obtaining the first signal.

10. An electronic touch device, characterized in that: The touch product triggering device comprises the touch product triggering device according to any one of claims 1 to 5.

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