Touch device and touch signal detection method
By using 2N electrodes to form emitter and receiver in capacitive touch buttons, and combining mutual capacitance and self-capacitance signal detection, the problem of false touches in the presence of conductive liquids is solved, and accurate identification of touch signal trigger sources is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN XIHUA TECHNOLOGY CO LTD
- Filing Date
- 2025-04-03
- Publication Date
- 2026-05-19
AI Technical Summary
Existing capacitive touch buttons have difficulty accurately distinguishing whether the trigger source of the touch signal is the human body or the conductive liquid when conductive liquid is present, leading to frequent accidental touches.
2N electrodes are arranged around the central axis to form emitter and receiver electrodes, and mutual capacitance and self-capacitance signals are detected at different stages. The trigger source is determined by analyzing the first and second touch signal quantities through the processor.
It can accurately distinguish between human body and conductive liquid touch signals, avoid accidental touches, and improve the accuracy of capacitive touch buttons.
Smart Images
Figure CN120415408B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of touch recognition technology, and in particular to a touch device and a touch signal detection method. Background Technology
[0002] Capacitive touch buttons, which detect changes in the capacitance of electrodes to determine if a finger is touching the screen, have become a common user interaction device. Compared to traditional mechanical buttons, capacitive touch buttons offer numerous advantages, including a more attractive appearance, lower cost, lower power consumption, and longer lifespan, leading to a continuous increase in their application demand.
[0003] However, during the use of capacitive touch buttons, if there are conductive liquids such as water droplets above the capacitive touch buttons, these conductive liquids will also change the capacitance of the electrodes. Obviously, if there is conductive liquid above the capacitive touch buttons, and it is not possible to accurately determine whether the trigger source of the touch signal is the conductive liquid or the human body, the capacitive touch buttons will experience accidental touches. Summary of the Invention
[0004] Therefore, it is necessary to provide a touch device and a touch signal detection method that can accurately determine the trigger source of a touch signal.
[0005] In a first aspect, this application provides a touch device. The touch device includes a processor and a touch sensor. The touch sensor includes 2N electrodes; the 2N electrodes are arranged around a central axis in a preset direction; the electrodes, spaced one electrode apart, are interconnected to form an emitter and a receiver; the emitter and receiver are respectively connected to the processor; N is an integer greater than 1.
[0006] The processor is used to generate the coding signal;
[0007] The processor is also used to input the coding signal to the transmitter in the first stage, detect the output signal of the receiver, and obtain the first touch signal quantity.
[0008] The processor is also used in the second stage to input the coding signal to the emitter and / or receiver, detect the output signal of the reference electrode, and obtain the second touch signal quantity; the first stage and the second stage belong to different stages of the detection cycle of the touch sensor;
[0009] The processor is also used to determine the trigger source of the touch signal acting on the touch sensor based on the first touch signal quantity and the second touch signal quantity.
[0010] Secondly, this application provides a touch signal detection method, wherein the touch sensor includes 2N electrodes; the 2N electrodes are arranged around a central axis in a preset direction; the electrodes, with a gap of one electrode between them, are interconnected to form an emitter and a receiver; N is an integer greater than 1; the method includes:
[0011] Generate coding signal;
[0012] In the first stage, the coding signal is input to the transmitter, and the output signal of the receiver is detected to obtain the first touch signal quantity.
[0013] In the second stage, the coding signal is input to the emitter and / or receiver, and the output signal of the reference electrode is detected to obtain the second touch signal quantity; the first stage and the second stage belong to different stages of the detection cycle of the touch sensor;
[0014] Based on the first touch signal quantity and the second touch signal quantity, the trigger source of the touch signal acting on the touch sensor is determined.
[0015] The aforementioned touch device and touch signal detection method include a processor and a touch sensor. The touch sensor comprises 2N electrodes arranged around a central axis in a preset direction. Electrodes spaced one electrode apart are interconnected to form an emitter and a receiver. The processor detects the output signal of the receiver in a first stage and the output signal of a reference electrode in a second stage to obtain a first touch signal quantity and a second touch signal quantity, respectively. Based on this, since the touch sensor has a specific structure, the first touch signal quantity is the mutual capacitance signal quantity between the emitter and receiver, and the second touch signal quantity is the self-capacitance signal quantity of the 2N electrodes. Therefore, different mutual capacitance signal quantities correspond to different electrical characteristics of different trigger sources. Thus, the touch device can determine the trigger source of the touch signal acting on the touch sensor based on the first and second touch signal quantities. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of a touch device provided in an embodiment of this application;
[0018] Figure 2 This is a schematic diagram of the touch signal quantity under a trigger source condition provided in an embodiment of this application;
[0019] Figure 3 This is a schematic diagram of the touch signal quantity under another trigger source condition provided in the embodiments of this application;
[0020] Figure 4 This is a flowchart illustrating a touch signal detection method provided in an embodiment of this application. Detailed Implementation
[0021] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0023] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various objects, but these objects are not limited by these terms. These terms are only used to distinguish one object from another. For example, without departing from the scope of this application, a first touch signal may be referred to as a second touch signal, and similarly, a second touch signal may be referred to as a first touch signal. Both the first touch signal and the second touch signal are touch signals, but they are not the same touch signal.
[0024] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.
[0025] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.
[0026] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.
[0027] This application was made by the inventor based on his understanding and research into the following issues:
[0028] During the use of capacitive touch buttons, if conductive liquids such as water droplets are present above the button, these liquids will alter the capacitance of the electrodes. Currently, most capacitive touch buttons detect touch signals by operating the electrodes in a single self-capacitance mode. Whether covered by a finger or conductive liquid, the self-capacitance signal of the capacitive touch button in single self-capacitance mode will increase.
[0029] Obviously, current capacitive touch buttons cannot accurately distinguish whether the trigger source of the touch signal is a human body or a conductive liquid based on changes in signal quantity. Therefore, the presence of conductive liquid above the capacitive touch button can easily lead to accidental touches. Based on this, this application proposes a touch device that enables electrodes to perform touch signal detection in mutual capacitance mode.
[0030] like Figure 1 As shown, a touch device in one embodiment includes a processor 102 and a touch sensor 104. The touch sensor 104 includes 2N electrodes 1042. The 2N electrodes 1042 are arranged around a central axis in a preset direction. The electrodes 1042 are interconnected with each other at intervals of one electrode 1042 to form an emitter 106 and a receiver 108. The emitter 106 and the receiver 108 are respectively connected to the processor 102. N is an integer greater than 1.
[0031] Processor 102 is used to generate coding signals.
[0032] The processor 102 is also used to input the coding signal to the emitter 106 in the first stage, detect the output signal of the receiver 108, and obtain the first touch signal quantity.
[0033] The processor 102 is also used to input the coding signal to the emitter 106 and / or receiver 108 in the second stage, detect the output signal of the reference electrode 110, and obtain the second touch signal quantity; the first stage and the second stage belong to different stages of the detection cycle of the touch sensor 104.
[0034] The processor 102 is also configured to determine the trigger source of the touch signal acting on the touch sensor 104 based on the first touch signal quantity and the second touch signal quantity.
[0035] Touch devices, in this context, refer to electronic devices capable of detecting changes in touch signal quantity when a human body or conductive object touches or approaches its surface, and converting these changes from electrical signals into digital signals for interactive input. Specifically, the changes in touch signal quantity refer to changes in capacitance.
[0036] Touch sensor 104 refers to a device in a touch device used to detect changes in touch signal quantity when a human body or conductive object touches or approaches its surface, and to feed back the changes in touch signal quantity to the processor 102 in the touch device. In other words, touch sensor 104 is a key device in a touch device for sensing touch signals. Optionally, touch sensor 104 can be a quadrilateral sensor.
[0037] A touch signal refers to the change in capacitance caused by a touch operation, and the change in capacitance can be processed by the processor 102 and represented as an electrical signal of a touch event.
[0038] Electrode 1042 refers to a conductive component in a touch device used to generate changes in the amount of touch signal under the action of coding signals and touch signals.
[0039] Optionally, electrode 1042 may be made of indium tin oxide, graphene, copper or other conductive materials.
[0040] The arrangement of 2N electrodes 1042 around a central axis with a preset direction means that the 2N electrodes 1042 are arranged around a certain central axis in a certain preset direction. For example, they can be arranged in a circle, ellipse or other symmetrical shape, and the 2N electrodes 1042 can be uniformly or non-uniformly distributed around the central axis.
[0041] For example, when 2N electrodes 1042 are arranged in a circle, the 2N electrodes 1042 can be arranged into a circle, with the central axis being the center of the circle. The 2N electrodes 1042 are evenly or non-uniformly distributed on the circumference to form a circular array. When 2N electrodes 1042 are arranged in an ellipse, the 2N electrodes 1042 can be arranged into an ellipse, with the central axis being the major or minor axis of the ellipse. The 2N electrodes 1042 are evenly or non-uniformly distributed on the circumference of the ellipse to form an elliptical array.
[0042] The interconnection of 2N electrodes 1042 with a gap of one electrode 1042 between them means that there is no connection between adjacent electrodes 1042 in the 2N electrodes 1042. Instead, two or more electrodes 1042 with a gap of one electrode 1042 between them are connected.
[0043] For example, suppose the touch sensor 104 consists of four right-angled sector electrodes 1042 arranged in a circle. The four electrodes 1042 are electrode 10421, electrode 10422, electrode 10423 and electrode 10424. According to the rule that "electrodes 1042 separated by one electrode 1042 are connected to each other", electrode 10421 and electrode 10423 are connected to form an electrode 1042 group, and electrode 10422 and electrode 10424 are connected to form an electrode 1042 group. The resulting two electrode 1042 groups form the emitter 106 and the receiver 108, respectively.
[0044] Since the emitter 106 and the receiver 108 are formed by interconnecting the electrodes 1042, which are 2N electrodes 1042 with one electrode 1042 between them, the emitter 106 includes N electrodes 1042 out of the 2N electrodes 1042 and the receiver 108 includes the other N electrodes 1042 out of the 2N electrodes 1042.
[0045] Specifically, the touch sensor 104 is configured to form an emitter 106 and a receiver 108, respectively, in order to generate a first touch signal quantity that is a mutual capacitance signal quantity based on the coding signal and the touch signal. The electrodes 1042, which are spaced apart by one electrode 1042, are interconnected to ensure that the touch signal of the human body can simultaneously cover both the emitter 106 and the receiver 108, regardless of where the touch signal of the human body covers the touch sensor 104. This avoids the situation where the emitter 106 and the receiver 108 cannot be covered simultaneously, which would prevent the generation of a mutual capacitance signal quantity and thus make it impossible to distinguish the trigger source of the touch signal.
[0046] Processor 102 refers to a device in a touch device used to configure the operating mode of touch sensor 104, detect changes in touch signal quantity from touch sensor 104, and convert the changes in touch signal quantity, which are presented as electrical signals, into touch signal quantity, which are presented as digital signals. Specifically, in this embodiment, processor 102 is used to configure the emitter 106 and receiver 108 of touch sensor 104 to a mutual capacitance operating mode in the first stage of the detection cycle, and to configure all 2N electrodes 1042 of touch sensor 104 to a self-capacitive operating mode in the second stage of the detection cycle, thereby, the first touch signal quantity is a mutual capacitance signal quantity, and the second touch signal quantity is a self-capacitive signal quantity.
[0047] Alternatively, the processor 102 may be a capacitance acquisition chip.
[0048] The first coding signal refers to a coded electrical signal (exemplarily, a pulse sequence, a sine wave, etc.) of a certain frequency input to the emitter 106 by the processor 102 in the first stage, so as to form an excitation electric field in the touch sensor 104, so that the receiver 108 can detect the change in mutual capacitance between the emitter 106 and the receiver 108 based on the excitation electric field and the touch signal to obtain a first output signal, thereby enabling the processor 102 to detect the first output signal of the receiver 108 to obtain a first touch signal quantity.
[0049] The second coding signal refers to a coded electrical signal (exemplarily, a pulse sequence, a sine wave, etc.) of a certain frequency input to the emitter 106 and / or receiver 108 by the processor 102 in the second stage, so as to form an excitation electric field in the touch sensor 104, so that the reference electrode 110 can detect the self-capacitance changes of the 2N electrodes 1042 based on the excitation electric field and the touch signal to obtain a second output signal, thereby enabling the processor 102 to detect the second output signal of the reference electrode 110 to obtain a second touch signal quantity.
[0050] Optionally, the frequency of the coding signal in the first stage and the frequency of the coding signal in the second stage can be the same.
[0051] The first touch signal quantity is the result of all the mutual capacitance signals generated by the entire touch sensor 104 based on the N electrodes 1042 in the emitter 106 and the N electrodes 1042 in the receiver 108; the second touch signal quantity is the result of all the self-capacitance signals generated by the entire touch sensor 104 based on the 2N electrodes 1042. That is to say, the first touch signal quantity and the second touch signal quantity correspond to the entire touch sensor 104.
[0052] It should be noted that although the first touch signal quantity also includes the self-capacitive signal quantity of the 2N electrodes 1042, since the emitter 106 and receiver 108 in the touch sensor 104 are operating in mutual capacitance mode under the action of the coding signal, the first touch signal quantity obtained at this time is basically dominated by the mutual capacitance signal quantity. Therefore, the self-capacitive signal quantity of the 2N electrodes 1042 in the first touch signal quantity can be ignored. That is to say, the first touch signal quantity can be regarded as the mutual capacitance signal quantity between the emitter 106 and receiver 108 in the first stage.
[0053] The detection cycle refers to the time required for the touch sensor 104 to periodically detect the capacitance values of 2N electrodes 1042 at fixed intervals. A shorter detection cycle results in a faster determination of the trigger source of the touch signal by the touch device; conversely, a longer detection cycle results in a slower determination of the trigger source. Therefore, there is a negative correlation between the length of the detection cycle and the speed at which the touch device determines the trigger source of the touch signal.
[0054] Optionally, the detection period can be 20ms, 30ms, 50ms or other times.
[0055] Optionally, the duration of the first phase and the duration of the second phase can be the same or different.
[0056] The trigger source of the touch signal refers to the physical factor that causes the capacitance change of the 2N electrodes 1042 of the touch sensor 104, i.e., the source of the touch signal.
[0057] Optionally, the trigger source for the touch signal may include the human body or a conductive liquid. Optionally, the human body may be a human finger. Optionally, the conductive liquid may be water, an electrolyte solution, or other conductive liquid.
[0058] Specifically, for the same touch signal trigger source, the mutual capacitance signal between the emitter 106 and the receiver 108 is different from the self-capacitance signal of the 2N electrodes 1042. Furthermore, since different touch signal trigger sources themselves have different electrical characteristics, the processor 102 can accurately determine the trigger source of the touch signal based on the difference between the first touch signal quantity which presents as a mutual capacitance signal quantity and the second touch signal quantity which presents as a self-capacitance signal quantity.
[0059] Optionally, after the processor 102 determines the trigger source of the touch signal acting on the touch sensor 104, the processor 102 can also determine whether to respond to the touch signal based on the trigger source. For example, if the trigger source of the touch signal includes a human body, the touch signal is responded to; otherwise, if the trigger source of the touch signal is a conductive liquid, the touch signal is not responded to to avoid accidental touches.
[0060] In an exemplary embodiment, after the processor 102 inputs the coding signal to the emitter 106 in the first stage, the touch sensor 104 is used to detect the amount of capacitance change caused by the touch signal through the receiver 108 based on the coding signal, and obtain the first output signal of the receiver 108, so that the processor 102 detects the first output signal of the receiver 108 to obtain the first touch signal amount.
[0061] In an exemplary embodiment, after the processor 102 inputs the coding signal to the emitter 106 and / or receiver 108 in the second stage, the touch sensor 104 is used to detect the amount of capacitance change caused by the touch signal through the reference electrode 110 based on the coding signal, and obtains the second output signal of the receiver 108, so that the processor 102 detects the second output signal of the reference electrode 110 to obtain the second touch signal amount.
[0062] The reference electrode 110 refers to the component in the touch sensor 104 used to detect the amount of self-capacitive signal, and the reference electrode 110 is connected to the processor 102.
[0063] Optionally, the reference electrode 110 can be formed by connecting 2N electrodes 1042 together.
[0064] The aforementioned touch device includes a processor and a touch sensor. The touch sensor comprises 2N electrodes arranged around a central axis in a preset direction. Electrodes spaced one electrode apart are interconnected to form an emitter and a receiver. The processor detects the output signal of the receiver in a first stage and the output signal of the reference electrode in a second stage to obtain a first touch signal quantity and a second touch signal quantity, respectively. Based on this, due to the specific structure of the touch sensor, the first touch signal quantity is the mutual capacitance signal quantity between the emitter and receiver, and the second touch signal quantity is the self-capacitance signal quantity of the 2N electrodes. Therefore, different mutual capacitance signal quantities correspond to different electrical characteristics of different trigger sources. Thus, the touch device can determine the trigger source of the touch signal acting on the touch sensor based on the first and second touch signal quantities.
[0065] In one exemplary embodiment, 2N electrodes form a circular or elliptical shape.
[0066] In one exemplary embodiment, 2N electrodes are uniformly arranged around a central axis in a predetermined direction.
[0067] In the case where 2N electrodes form a circular shape and are evenly arranged around the central axis of a preset direction, each electrode is a sector-shaped electrode, and the central angle of each electrode is 360° / (2N).
[0068] For example, when N is 2, the touch sensor consists of 4 sector electrodes with a central angle of 90°; when N is 4, the touch sensor consists of 8 sector electrodes with a central angle of 45°.
[0069] In one exemplary embodiment, such as Figure 1As shown, the spacing D between adjacent electrodes is the same, and the ratio between the spacing D and the diameter of the touch sensor is 0.05~0.15.
[0070] The diameter of the touch sensor can be 13.5mm to 15.5mm. When the ratio between the spacing D and the diameter of the touch sensor is 0.05 to 0.15, the spacing D between adjacent electrodes can be 0.675mm to 0.153mm.
[0071] In one exemplary embodiment, N is 2.
[0072] In one exemplary embodiment, the touch sensor further includes a circuit board and a packaging layer; 2N electrodes are located between the circuit board and the packaging layer.
[0073] The encapsulation layer refers to the protective layer located on the side of the 2N electrodes in the touch sensor closest to the touch signal. The encapsulation layer protects the touch sensor from external environmental influences and allows the user to send touch signals to the touch sensor through it.
[0074] Alternatively, the encapsulation layer may be made of glass, plastic, acrylic sheet or other transparent material.
[0075] The circuit board is located on the side of the 2N electrodes furthest from the touch signal. The circuit board is a key component in the touch sensor used to convert the touch signal from an analog signal into an electrical signal that can be detected and analyzed.
[0076] Alternatively, the reference electrode of the touch sensor may be located at the bottom of the circuit board on the side away from the touch signal.
[0077] In one exemplary embodiment, the processor is configured to determine, when the first touch signal quantity is greater than the second touch signal quantity, that the triggering source of the touch signal acting on the touch sensor includes a human body.
[0078] In one exemplary embodiment, the processor is configured to determine that the trigger source of the touch signal acting on the touch sensor is a conductive liquid when the first touch signal amount is less than the second touch signal amount.
[0079] The trigger source for the touch signal includes a human body and may also include a conductive liquid. When the first touch signal quantity is greater than the second touch signal quantity, the trigger source for the touch signal, whether it consists only of a human body or includes both a human body and a conductive liquid, will always have a first touch signal quantity greater than the second touch signal quantity. Therefore, in this case, it is sufficient to determine that the trigger source for the touch signal must include a human body, as long as the first touch signal quantity is greater than the second touch signal quantity.
[0080] Specifically, regardless of whether the coding signal is a high-frequency coding signal or a low-frequency coding signal, the trigger source of the touch signal, whether it is only the human body or includes both the human body and conductive liquid, the amount of the first touch signal is greater than the amount of the second touch signal.
[0081] Specifically, since both the human body and conductive liquids are conductive, the amount of mutual capacitance signal generated when the trigger source of the touch signal includes both the human body and conductive liquid will be greater than the amount of mutual capacitance signal generated when the trigger source of the touch signal is only the human body. Therefore, it can be ensured that when the first touch signal amount is greater than the second touch signal amount, the trigger source of the touch signal must include the human body.
[0082] For example, using time nodes on the time axis as the horizontal axis and touch signal quantity as the vertical axis, in the case of a touch device employing a touch sensor with a specific structure provided in the embodiments of this application, such as... Figure 2 As shown, when the trigger source is only the human touch signal acting on the touch sensor, the amount of touch signal when the emitter and receiver of the touch sensor operate in mutual capacitance mode is greater than the amount of touch signal when the 2N electrodes of the touch sensor operate in self capacitance mode; for example... Figure 3 As shown, when the touch signal from only a conductive liquid acts on the touch sensor, the touch signal quantity when the emitter and receiver of the touch sensor operate in mutual capacitance mode is less than the touch signal quantity when the 2N electrodes of the touch sensor operate in self-capacitance mode. Based on this, due to the different electrical properties of the human body and conductive liquids, and considering that the touch sensor can be configured with different electrode operating modes at different stages to obtain different touch signal quantities based on different trigger sources, the touch device provided in this application, including a touch sensor with a specific structure, can determine the trigger source of the touch signal acting on the touch sensor based on a first touch signal quantity and a second touch signal quantity.
[0083] Specifically, because the conductivity of the human body is stronger than that of conductive liquids, and because a more conductive trigger source corresponds to a larger touch signal quantity, and because the signal quantity difference between the mutual capacitance signal quantity and the self-capacitance signal quantity is greater for a more conductive trigger source, when the trigger source includes the human body, due to the higher conductivity of the human body, the mutual capacitance signal quantity will be greater than the self-capacitance signal quantity. That is to say, the first touch signal quantity, which presents as a mutual capacitance signal quantity, is greater than the second touch signal quantity, which presents as a self-capacitance signal quantity. Conversely, when the trigger source is a conductive liquid, because the conductivity of the conductive liquid is weaker than that of the human body, the mutual capacitance signal quantity will be smaller. The smaller mutual capacitance signal quantity cannot cancel out the self-capacitance signal quantity present in the 2N electrodes themselves. Therefore, when the trigger source is a conductive liquid, the self-capacitance signal quantity will be greater than the mutual capacitance signal quantity. That is to say, the first touch signal quantity, which presents as a mutual capacitance signal quantity, is less than the second touch signal quantity, which presents as a self-capacitance signal quantity.
[0084] Since a higher frequency coding signal corresponds to a larger mutual capacitance signal, when the frequency of the first coding signal is greater than the frequency of the second coding signal, the processor can determine that the trigger source of the touch signal includes the human body when the first touch signal quantity is greater than the second touch signal quantity. Conversely, when the first touch signal quantity is less than the second touch signal quantity, the processor determines that the trigger source of the touch signal is a conductive liquid. Thus, the touch device can accurately determine the trigger source of the touch signal based on the first touch signal quantity and the second touch signal quantity.
[0085] In one exemplary embodiment, the processor is configured to determine that the trigger source of the touch signal acting on the touch sensor includes a human body when the first touch signal quantity is greater than the second touch signal quantity and the absolute value of the difference between the first touch signal quantity and the second touch signal quantity is greater than or equal to a first threshold.
[0086] In an exemplary embodiment, the processor is configured to determine that the trigger source of the touch signal acting on the touch sensor is a conductive liquid when the first touch signal quantity is less than the second touch signal quantity and the absolute value of the difference between the first touch signal quantity and the second touch signal quantity is greater than or equal to a second threshold.
[0087] The preset threshold can be pre-set in the processor. The preset threshold is related to the processor's configuration parameters for the touch sensor. For example, if the touch sensor configuration will have a large amount of touch signal, the preset threshold should also be set to a larger threshold.
[0088] The first and second stages of the processor are interchangeable. During this interchange, it is necessary to ensure that the target of the coding signal also switches according to the operating mode of the touch sensor. Specifically, if the processor configures the first stage of the touch sensor to a mutual capacitance operating mode between the emitter and receiver, then the processor configures the second stage of the touch sensor to a self-capacitive operating mode with 2N electrodes. Conversely, if the processor configures the first stage of the touch sensor to a self-capacitive operating mode with 2N electrodes, then the processor configures the second stage of the touch sensor to a mutual capacitance operating mode between the emitter and receiver. Based on this, in an exemplary embodiment, when the first stage is a self-capacitive operating mode with 2N electrodes and the second stage is a mutual capacitance operating mode between the emitter and receiver, the processor is used to determine that the trigger source of the touch signal is a conductive liquid when the first touch signal amount is less than the second touch signal amount; and to determine that the trigger source of the touch signal includes a human body when the first touch signal amount is greater than the second touch signal amount.
[0089] It is understood that the above-mentioned touch device can also take other forms, not limited to the forms mentioned in the above embodiments, as long as it can achieve the function of accurately determining the trigger source of the touch signal.
[0090] The aforementioned touch devices can be various personal computers, laptops, smartphones, tablets, IoT devices, portable wearable devices, gaming devices, or other devices with touch functionality.
[0091] Based on the same inventive concept, this application also provides a touch signal detection method, applied in a touch device. The touch device includes a touch sensor, which includes 2N electrodes. The 2N electrodes are arranged around a central axis in a preset direction. The electrodes, spaced one electrode apart, are interconnected to form an emitter and a receiver. N is an integer greater than 1. Figure 4 As shown, the method includes the following steps 402 to 408:
[0092] 402, Generate coding signal.
[0093] 404. In the first stage, the coding signal is input to the transmitter, and the output signal of the receiver is detected to obtain the first touch signal quantity.
[0094] 406. In the second stage, the coding signal is input to the emitter and / or receiver, and the output signal of the reference electrode is detected to obtain the second touch signal quantity; the first stage and the second stage belong to different stages of the detection cycle of the touch sensor.
[0095] 408. Based on the first touch signal quantity and the second touch signal quantity, determine the trigger source of the touch signal acting on the touch sensor.
[0096] The aforementioned touch signal detection method is applied to a touch device including a touch sensor. The touch sensor comprises 2N electrodes arranged around a central axis in a preset direction. Electrodes spaced one electrode apart are interconnected to form an emitter and a receiver. The method detects the output signal of the receiver in a first stage and the output signal of a reference electrode in a second stage to obtain a first touch signal quantity and a second touch signal quantity, respectively. Based on this, since the touch sensor has a specific structure, the first touch signal quantity is the mutual capacitance signal quantity between the emitter and receiver, and the second touch signal quantity is the self-capacitance signal quantity of the 2N electrodes. Therefore, different mutual capacitance signal quantities correspond to different electrical characteristics of different trigger sources. Thus, the touch device can determine the trigger source of the touch signal acting on the touch sensor based on the first and second touch signal quantities.
[0097] It should be noted that the solution provided by this touch signal detection method is similar to the solution described in the above-mentioned touch device. Therefore, the specific limitations of one or more touch signal detection method embodiments provided above can be found in the limitations of the touch device above, and will not be repeated here.
[0098] In one exemplary embodiment, determining the trigger source of the touch signal acting on the touch sensor based on a first touch signal quantity and a second touch signal quantity includes:
[0099] If the first touch signal quantity is greater than the second touch signal quantity, it is determined that the trigger source of the touch signal acting on the touch sensor includes the human body.
[0100] If the first touch signal quantity is less than the second touch signal quantity, the trigger source of the touch signal acting on the touch sensor is determined to be a conductive liquid.
[0101] In an exemplary embodiment, when the first touch signal quantity is greater than the second touch signal quantity, determining that the trigger source of the touch signal acting on the touch sensor includes a human body includes:
[0102] If the first touch signal quantity is greater than the second touch signal quantity, and the absolute value of the difference between the first touch signal quantity and the second touch signal quantity is greater than or equal to the first threshold, it is determined that the trigger source of the touch signal acting on the touch sensor includes the human body.
[0103] When the first touch signal quantity is less than the second touch signal quantity, determining that the trigger source of the touch signal acting on the touch sensor is a conductive liquid includes:
[0104] If the first touch signal quantity is less than the second touch signal quantity, and the absolute value of the difference between the first touch signal quantity and the second touch signal quantity is greater than or equal to the second threshold, the trigger source of the touch signal acting on the touch sensor is determined to be a conductive liquid.
[0105] In one exemplary embodiment, the first touch signal quantity and the second touch signal quantity are both greater than 0.
[0106] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.
[0107] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0108] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.
Claims
1. A touch device, characterized in that, The system includes a processor and a touch sensor. The touch sensor includes 2N electrodes arranged around a central axis in a preset direction. The electrodes, spaced one electrode apart, are interconnected to form an emitter and a receiver. The emitter and the receiver are respectively connected to the processor. N is an integer greater than 1. The processor is used to generate coding signals; The processor is further configured to input the coding signal to the transmitter in the first stage, detect the output signal of the receiver, and obtain the first touch signal quantity; The processor is further configured to input the coding signal to the emitter and / or the receiver in the second stage, detect the output signal of the reference electrode, and obtain a second touch signal quantity; the first stage and the second stage belong to different stages of the detection cycle of the touch sensor; The processor is further configured to determine the trigger source of the touch signal acting on the touch sensor based on the first touch signal quantity and the second touch signal quantity.
2. The device according to claim 1, characterized in that, The 2N electrodes form a circular or elliptical shape.
3. The device according to claim 1, characterized in that, The 2N electrodes are evenly arranged around a central axis in a preset direction.
4. The device according to claim 1, characterized in that, The spacing between adjacent electrodes is the same, and the ratio between the spacing and the diameter of the touch sensor is 0.05 to 0.
15.
5. The device according to claim 1, characterized in that, The value of N is 2.
6. The device according to claim 1, characterized in that, The touch sensor also includes a circuit board and a packaging layer; the 2N electrodes are located between the circuit board and the packaging layer.
7. A touch signal detection method, characterized in that, The method is applied to a touch device, which includes a touch sensor and 2N electrodes. The 2N electrodes are arranged around a central axis in a preset direction. The electrodes, spaced one electrode apart, are connected to each other to form an emitter and a receiver. N is an integer greater than 1; the method includes: Generate coding signal; In the first stage, the coding signal is input to the transmitter, and the output signal of the receiver is detected to obtain the first touch signal quantity. In the second stage, the coding signal is input to the emitter and / or the receiver, and the output signal of the reference electrode is detected to obtain the second touch signal quantity; the first stage and the second stage belong to different stages of the detection cycle of the touch sensor; Based on the first touch signal quantity and the second touch signal quantity, the trigger source of the touch signal acting on the touch sensor is determined.
8. The method according to claim 7, characterized in that, The step of determining the trigger source of the touch signal acting on the touch sensor based on the first touch signal quantity and the second touch signal quantity includes: If the first touch signal quantity is greater than the second touch signal quantity, it is determined that the trigger source of the touch signal acting on the touch sensor includes the human body; If the first touch signal quantity is less than the second touch signal quantity, the trigger source of the touch signal acting on the touch sensor is determined to be a conductive liquid.
9. The method according to claim 8, characterized in that, When the first touch signal quantity is greater than the second touch signal quantity, determining that the trigger source of the touch signal acting on the touch sensor includes a human body includes: If the first touch signal quantity is greater than the second touch signal quantity, and the absolute value of the difference between the first touch signal quantity and the second touch signal quantity is greater than or equal to the first threshold, it is determined that the triggering source of the touch signal acting on the touch sensor includes the human body. The step of determining that the trigger source of the touch signal acting on the touch sensor is a conductive liquid when the first touch signal quantity is less than the second touch signal quantity includes: If the first touch signal quantity is less than the second touch signal quantity, and the absolute value of the difference between the first touch signal quantity and the second touch signal quantity is greater than or equal to the second threshold, the trigger source of the touch signal acting on the touch sensor is determined to be a conductive liquid.
10. The method according to claim 7, characterized in that, The first touch signal quantity and the second touch signal quantity are both greater than 0.