CN108964649B - Electrostatic capacitance switch unit - Google Patents
Electrostatic capacitance switch unit Download PDFInfo
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- CN108964649B CN108964649B CN201710357459.0A CN201710357459A CN108964649B CN 108964649 B CN108964649 B CN 108964649B CN 201710357459 A CN201710357459 A CN 201710357459A CN 108964649 B CN108964649 B CN 108964649B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 230000004044 response Effects 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims description 52
- 238000001514 detection method Methods 0.000 claims description 47
- 238000012790 confirmation Methods 0.000 claims description 43
- 238000012423 maintenance Methods 0.000 claims description 43
- 238000005259 measurement Methods 0.000 claims description 42
- 230000004913 activation Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002459 sustained effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/960735—Capacitive touch switches characterised by circuit details
- H03K2217/960745—Capacitive differential; e.g. comparison with reference capacitance
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Abstract
An electrostatic capacity switching unit. The invention provides a capacitive switch device and a control method thereof, wherein the capacitive switch device comprises: a touch sensing unit (100) including a sensing electrode (110) and a transmission electrode (120) disposed on a substrate (2); and a touch control module (200) disposed on the substrate (2) and configured to confirm a contact manipulation state of an operator based on a sensing signal from the touch sensing unit (100) and output a touch output signal, wherein the transmission electrode (120) outputs the transmission signal in response to the transmission control signal from the touch control module (200), the sensing electrode (110) detects a signal for application to the touch control module (200) in response to the sensing control signal from the touch control module (200), and wherein the touch control module (200) enables the sensing electrode (110) and the transmission electrode (120) according to a preset pattern.
Description
Technical Field
The present invention relates to a capacitive switching device, and more particularly, to a capacitive switching device having a simplified configuration, which allows both smoother operation and a compact arrangement structure so as to more accurately detect contact with a human body.
Background
In addition to functioning as a moving tool, a vehicle such as an automobile is required to function as various types of convenience tools capable of providing a more stable and comfortable running state for a user. Vehicles are therefore equipped with various amenities, various types of switches for operating and controlling them, and means for displaying them.
Various switches are provided intensively at the steering wheel of the vehicle to improve the convenience of the driver. Depending on the circumstances, the complex physical arrangement of the switches may cause the driver to cause erroneous operation or to fix his or her eyes to the steering wheel, resulting in an increased risk of occurrence of a safety accident.
The coverage of capacitive touch sensing capacitive switches as an alternative to traditional mechanical switches with poor durability is extending for smoother handling and operation of the switches. Capacitive touch sensing methods can be generally classified into self-capacitance type and mutual capacitance type. The capacitance value obtained at the sensor electrode changes, and a reference value (i.e., a baseline) that moves together with the obtained change in capacitance value is set. When the difference between the capacitance value obtained at the sensor electrode and the reference value (i.e., baseline) exceeds a certain threshold value, a human touch is determined. In this case, the conventional baseline does not reflect the value obtained at the sensor electrode. The baseline reflects the value obtained at the sensor electrode when the difference between the value obtained at the sensor electrode and the baseline value is less than a particular threshold value. At this point, the sensor determines that the human body is separated from the sensor.
However, the conventional mechanical switch causes erroneous operation and a reduction in life due to wear of consumable parts such as a mechanism and a spring according to repeated use thereof, causes an increase in the types and the number of parts, and consumes a large number of man-hours. In addition, in the case where a conventional capacitive sensor is used as a single button, a single method based on self capacitance or mutual capacitance is adopted. In either case, conventional mechanical switches involve the problem that capacitive sensors are susceptible to the surrounding environment (e.g., temperature and humidity/magnetic field). In other words, when the surrounding environment such as water, a magnetic field, and an electric field suddenly changes greatly, the existing touch algorithm determines a human touch, and there is also a problem in that: the touch algorithm maintains the state that the human body has touched until the suddenly changed environment returns to its original state.
Disclosure of Invention
Technical problem
Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a capacitive switching device and a control method thereof, which allow capacitance measurement to be combined and a reference value to reflect a capacitance value obtained at a sensor electrode to reflect a signal attenuation state in which a human touch occurs, so that more accurate touch detection can be achieved.
Technical proposal
In order to achieve the above object, in one aspect, the present invention provides a capacitive switching device including: a touch sensing unit 100 including a sensing electrode 110 and a transmitting electrode 120 disposed on a substrate 2; and a touch control module 200 disposed on the substrate 2 and configured to confirm a contact manipulation state of an operator based on a sensing signal from the touch sensing unit 100 and output a touch output signal, wherein the transmission electrode 120 outputs a transmission signal in response to the transmission control signal from the touch control module 200, the sensing electrode 110 detects a signal for application to the touch control module 200 in response to the sensing control signal from the touch control module 200, and wherein the touch control module 200 enables the sensing electrode 110 and the transmission electrode 120 according to a preset pattern.
In the capacitive switching device, the sensing electrode 110 and the transmitting electrode 120 may be disposed on both surfaces of the substrate 2, respectively.
In the capacitive switching device, the sensing electrode 110 and the transmitting electrode 120 may be disposed on the same surface of the substrate 2.
In the capacitive switching device, the transmission electrode 120 may be disposed at the outer periphery of the sensing electrode 110.
In the capacitive switching device, the touch control module 200 may include: a touch sensor control unit 21 configured to apply a transmission control signal to the transmission electrode 120 and a sensing control signal to the sensing electrode 110, and control the activation of the transmission electrode 120 and the sensing electrode 110; a signal processing unit 23 configured to process a signal detected by the sensing electrode 110; and a signal output unit 25 configured to output the signal processed by the signal processing unit 23 to the outside.
In the capacitive switching device, the touch sensor control unit 21 may perform a self-capacitance measurement mode in which the sensing electrode 110 is enabled and the transmitting electrode 120 is disabled.
In the capacitive switching device, the touch sensor control unit 21 may perform a mutual capacitance measurement mode of disabling the sensing electrode 110 and enabling the transmitting electrode 120.
In the capacitive switching device, the touch sensor control unit 21 may perform a combined capacitance measurement mode enabling the sensing electrode 110 and the transmitting electrode 120.
In another aspect, the present invention provides a method of controlling a capacitive switching device, the method comprising the steps of: providing a capacitive switching device including a touch sensing unit 100 and a touch control module 200, the touch sensing unit 100 including a sensing electrode 110 and a transmission electrode 120 disposed on a substrate 2, the touch control module 200 being disposed on the substrate 2 and configured to confirm a contact manipulation state of an operator based on a sensing signal from the touch sensing unit 100 and output a touch output signal, wherein the transmission electrode 120 outputs the transmission signal in response to the transmission control signal from the touch control module 200, the sensing electrode 110 detects the signal for application to the touch control module 200 in response to the sensing control signal from the touch control module 200, and wherein the touch control module 200 enables the sensing electrode 110 and the transmission electrode 120 according to a preset pattern; a detection step S10, the detection step S10 enabling the touch sensing unit 100 to detect whether there is manipulation of the operator in response to a control signal from the touch control module 200; a signal pattern analysis step S20 of analyzing and confirming the sensing signal detected in the detection step S10 and determining whether there is a contact and touch operation of the operator; a reference value updating step S30 of updating the reference value of the touch sensing unit 100 using the sensing signal calculated in the signal pattern analysis step S20; and an output mode execution step S40 of executing an output mode of determining whether to output the output signal based on the result of the determination executed in the signal pattern analysis step S20.
In the capacitive switching device control method, the touch control module 200 may include: a touch sensor control unit 21 configured to apply a transmission control signal to the transmission electrode 120 and a sensing control signal to the sensing electrode 110, and control the activation of the transmission electrode 120 and the sensing electrode 110; a signal processing unit 23 configured to process a signal detected by the sensing electrode 110; and a signal output unit 25 configured to output the signal processed by the signal processing unit 23 to the outside. The detecting step S20 may include one or more of step S11, step S13, and step S15, the step S11 detecting a self-capacitance measurement mode in which the sensing electrode 110 is enabled and the transmitting electrode 120 is disabled, the step S13 detecting a mutual capacitance measurement mode in which the sensing electrode 110 is disabled and the transmitting electrode 120 is enabled, and the step S15 detecting a combined capacitance measurement mode in which the sensing electrode 110 and the transmitting electrode 120 are enabled, the self-capacitance measurement mode, the mutual capacitance measurement mode, and the combined capacitance measurement mode being performed by the touch sensor control unit 21.
In the capacitive switching device control method, the signal pattern analysis step S20 may include: a human body touch confirmation step (S20 a, S21, and S211) of determining and confirming whether the body of the operator is touched with the touch sensing unit 100; a touch manipulation confirmation step (S23, S231, S233, S235, S237, and S239) of determining whether or not the human body touch state is continued based on the result of the determination of whether or not there is a human body touch in the human body touch confirmation step (S21 and S211) to confirm the touch manipulation intention of the operator; and an idle state control confirmation step (S25 and S251) of controlling the idle state of the touch sensing unit 100 based on a result of confirmation of the touch manipulation intention of the operator in the touch manipulation confirmation step.
In the capacitive switching device control method, the touch control module 200 may further include a storage unit 30, the storage unit 30 being configured to store preset data including an initial value, and the human touch confirmation step (S20 a, S21, and S211) includes: a differential capacitance confirmation step S20a of confirming whether the touch sensing unit 100 is in an idle state (idle=on), and enabling the sensing electrode of the touch sensing unit 100 to confirm a differential capacitance value, which is a difference between an actual capacitance value and a reference value, from a sensing signal; a human body touch determining step S21 of comparing the differential capacitance value with a preset attenuation amount included in preset data stored in the storage unit 30 to determine whether there is a human body touch in an idle state of the touch sensing unit 100; and a human body touch setting step S211 of determining a human body touch (HT) state in which the body of the operator touches the touch sensing unit 100 as on if the differential capacitance value is a negative value less than the preset attenuation amount in the human body touch determining step S21.
In the capacitive switching device control method, the touch manipulation confirmation step (S23, S231, S233, S235, S237, and S239) may include the steps of: a human body touch (HT) state determining step S23 of determining whether the human body touch state confirmed in the human body touch confirming step (S20 a, S21, and S211) is an on state; a human body touch maintenance determination step S231 of determining whether a sensing signal indicating a touch state of the touch sensing unit 100 is continued, if it is determined that the human body touch state is an on state in the human body touch confirmation step (S20 a, S21, and S211); a touch maintenance counter increment step S233 of incrementing a touch maintenance counter using the counter 27 of the touch control module 200 if it is determined that the touch state is maintained in the human touch maintenance determination step S231; a sustain reference time lapse determining step S235 of comparing the touch sustain time with a sustain reference time (ts) included in preset data after the touch sustain counter increasing step S233, and determining whether the touch sustain state is sustained for a predetermined time period; and a touch state confirmation step S237 of switching the touch detection state of the touch sensing unit 100 to on and setting the idle state of the touch sensing unit 100 to on if it is determined in the maintenance reference time elapse determination step S235 that the touch maintenance time exceeds the maintenance reference time (ts).
In the capacitive switching device control method, the reference value updating step S30 may include calculating and updating the reference value using a previous difference capacitance calculated from an initial set value or a previous sensing signal and a current difference capacitance calculated from a current sensing signal in the signal pattern analysis step.
In the capacitive switching device control method, the output mode performing step (S40 and S50) may include the steps of: a touch detection state determination step S40 of determining whether the touch detection state is an on state; and an output control step S50 of switching the touch detection state to the off state and controlling to output an output control signal to the outside through the signal output unit if it is determined in the touch detection state determination step S40 that the touch detection state is the on state.
In the capacitive switching device control method, the output control step S50 may include the steps of: a signal output step S511 of switching the touch detection state to the off state and controlling to output an output control signal for applying to the signal output unit to switch the output signal to the on state to the outside if it is determined in the touch detection state determination step S40 that the touch detection state is the on state; an output switching standby step S513 of waiting for a preset time included in the preset data; and an output signal off setting step S515 of switching the state of the output signal off to interrupt the signal output from the signal output unit to the outside if the waiting for the exceeding of the preset time is performed in the output switching standby step S513.
Advantageous effects
The capacitive switching device according to the embodiment of the present invention constructed above has the following advantageous effects.
Self-capacitance and mutual capacitance are measured simultaneously or selectively in a time-division manner for a single button using two electrodes. In addition, when measuring the self capacitance, a transmission sensor (i.e., TX sensor) is enabled to extract a combined signal obtained by fusing the mutual capacitance and the self capacitance, and to analyze a waveform change pattern of the signal obtained by the extraction to determine whether a human body touches, thereby avoiding erroneous operation due to external environmental influence.
In addition, the capacitive switching device of the present invention enables the capacitance value obtained at the sensor electrode to be set to be continuously reflected by the reference value (i.e., baseline) at a constant period, and recognizes and processes a constant pattern that appears consistently until the human body is in contact with and separated from the sensor, thereby minimizing external environmental impact.
In addition, the capacitive switching device of the present invention includes a basic configuration consisting of a PCB, a plastic product housing, and a filler filled therein, so that the number of parts and thus man-hours for assembly can be relatively reduced as compared to a complex mechanical switch consisting of a spring, a latch, a lever, a housing, etc.
The sensor is designed to be arranged on a PCB inside a plastic housing, whereby the capacitive switching device of the invention can be used semi-permanently and thus has a relatively improved durability compared to mechanical switches, since the components are less consumed and worn out even for long periods of use.
Drawings
The above and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a schematic block diagram illustrating a capacitive switching apparatus according to an embodiment of the present invention;
fig. 2 and 3 are schematic views showing configurations and modifications of a touch sensing unit of a capacitive switching device according to an embodiment of the present invention;
fig. 4 to 6 are configuration diagrams illustrating an enabled or disabled state of a touch sensing unit of a capacitive switching device according to an embodiment of the present invention;
Fig. 7 is a schematic diagram showing a differential capacitance value as a difference between a signal obtained at a sensor and a reference value reflecting the obtained signal in a self-capacitance, mutual capacitance, and combined capacitance measurement mode of a capacitive switching device according to an embodiment of the present invention;
Fig. 8 and 9 are flowcharts showing a capacitive switching device control method according to an embodiment of the present invention; and
Fig. 10 and 11 are schematic diagrams illustrating sensing signals, reference values, and differential capacitance values in a touch implementation example of a conventional touch sensor and a capacitive switching device according to an embodiment of the present invention.
Symbol description
10: Capacitive switching device
100: Touch sensing unit
200: Touch control module
Detailed Description
Hereinafter, the configuration and operation of the capacitive switching device of the present invention will be described in detail with reference to the accompanying drawings.
The capacitive switching device according to the embodiment of the present invention includes a touch sensing unit 100 and a touch control module 200. The other constituent elements are at least partially disposed within a housing (not shown), and the substrate 2 is disposed within the housing. The electrical components are arranged on the substrate 2. The substrate 2 may be modified in various ways according to design specifications, for example formed as a printed circuit board, a flexible substrate or an insert injection molded substrate. In this embodiment, a detailed configuration description of a separate case, substrate, etc. will be omitted, and a description will be focused on a necessary configuration.
The touch sensing unit 100 includes a sensing electrode 110 and a transmitting electrode 120 disposed on a substrate 2. The sensing electrode 110 and the transmitting electrode 120 disposed on the substrate are formed as predetermined conductive electrodes. The sensing electrode 110 is used to detect and measure self-capacitance and mutual capacitance. A transmission electrode (i.e., TX electrode) 120 provided on the substrate 2 is used to measure the mutual capacitance. In other words, the transmission electrode 120 implements a predetermined transmission operation in response to a sensing control signal from the touch sensor control unit 21 of the touch control module 200 (to be described later). The transmission electrode 120 forms an electric field at the sensing electrode 110 in response to the sensing control signal, and provides a sensing signal indicating that the user's contact with the switching device is sensed by a change in electrode capacitance due to the user's proximity and contact.
The sensing electrode 110 and the transmitting electrode 120 of the touch sensing unit 100 may take a structure in which the sensing electrode 110 and the transmitting electrode 120 are disposed on both surfaces of the substrate 2, respectively.
In other words, as shown in the drawing, the touch sensing unit 100 may take a structure in which the sensing electrode 110 and the transmitting electrode 120 are separately formed on both surfaces 2a and 2b of the substrate 2, respectively. With this structure, a compact configuration in which the formation area of the touch sensing unit on the substrate is limited can be achieved.
In addition, the touch sensing unit 100 may take a structure in which the sensing electrode 110 and the transmission electrode 120 are formed on one surface (i.e., the same surface) of the substrate 2. In addition, as shown in the drawing, the touch sensing unit 100 may take a structure in which the sensing electrode 110 and the transmitting electrode 120 are disposed on the same surface of the substrate and on the same layer. In other words, the touch sensing unit 100 may take such a structure: the sensing electrode 110 is disposed at a central portion of the substrate 2, and the transmission electrode 120 is disposed at a peripheral portion of the substrate 2 in such a manner as to surround an outer periphery of the sensing electrode 110, to increase touch sensing sensitivity.
The touch control module 200 is provided on the substrate 2, and serves to confirm a contact manipulation state of an operator based on a sensing signal from the touch sensing unit 100 and output a touch output signal. In other words, the transmission electrode 120 outputs a transmission signal in response to a transmission control signal from the touch control module 200, and the sensing electrode 110 detects a signal for application to the touch control module 200 in response to a sensing control signal from the touch control module 200, and the touch control module 200 enables the sensing electrode 110 and the transmission electrode 120 according to a preset pattern.
More specifically, the touch control module 200 includes a touch sensor control unit 21, a signal processing unit 23, and a signal output unit 25.
The touch sensor control unit 21 applies a transmission control signal to the transmission electrode 120 and applies a sensing control signal to the sensing electrode 110. In addition, the touch sensor control unit 21 controls the activation of the transmission electrode 120 and the sensing electrode 110. The activation control of the touch sensor control unit 21 may establish the individual activation of the sensing electrode 110, the individual activation of the transmitting electrode 120, and the activation of the sensing electrode 110 and the transmitting electrode 120.
In other words, the touch sensor control unit 21 may perform a self-capacitance measurement mode in which the sensing electrode 110 is enabled and the transmitting electrode 120 is disabled, so that capacitance, i.e., touch detection (see fig. 4) may be established in a self-capacitance manner.
In addition, the touch sensor control unit 21 may perform a mutual capacitance measurement mode of disabling the sensing electrode 110 and enabling the transmitting electrode 120 so that capacitance may be established in a mutual capacitance manner, i.e., touch detection (see fig. 5). The touch sensor control unit 21 may perform a combined capacitance measurement mode enabling the sensing electrode 110 and the transmitting electrode 120 so that a capacitance, i.e., touch detection, may be established in a combined capacitance manner in which a self capacitance and a mutual capacitance are combined (see fig. 6).
The signal processing unit 23 is used for processing the signal detected by the sensing electrode 110. The signal processing unit 23 receives a signal detected by the sensing electrode 110 and converts the received signal into a predetermined capacitance value. At this time, the calculated capacitance value may be stored in the storage unit 30, or a predetermined differential capacitance value may be calculated by the arithmetic unit 40 based on preset data stored in the storage unit 30. In addition, the signal processing unit 23 analyzes the signal pattern using data calculated from the detected signal and performs an operation of determining a direct contact or an operation intention of the user or the like.
The signal output unit 25 is for outputting the signal processed by the signal processing unit 23 to the outside. The processed signal output from the signal output unit 25 to the outside may be transmitted to an external control unit or an external storage unit. In other words, the signal output unit 25 receives the processed signal from the signal processing unit 23 and outputs the control signal. The signal output unit 25 may output a predetermined output signal to the external control unit when a normal touch operation of the user is performed.
As described above, the touch control module 200 may further include the storage unit 30. According to circumstances, the touch control module 200 may further include a separate arithmetic unit 40 in addition to the signal processing unit. The storage unit 30 may store preset data including an initial value of a reference value, a preset attenuation amount, and a sustain reference time (ts), and may be electrically connected with the signal processing unit 23 to perform a predetermined storage operation or a function of retrieving data stored therein. The arithmetic unit 40 may be additionally provided if a supplementary signal processing unit is required in addition to the signal processing operation or an arithmetic logic operation is required in the determination of a predetermined touch operation.
Hereinafter, a method of controlling the capacitive switching device 10 will be described with reference to the accompanying drawings.
The method of controlling the capacitive switching device 10 according to the embodiment of the present invention includes a providing step S1, a detecting step S10, a reference value updating step S30, and an output mode performing step S40.
In the providing step S1, the capacitive switching device 10 is provided. As described above, the capacitive switching device 10 includes: a touch sensing unit 100 including a sensing electrode 110 and a transmitting electrode 120 disposed on a substrate 2; and a touch control module 200 disposed on the substrate 2 and configured to confirm a contact manipulation state of an operator based on a sensing signal from the touch sensing unit 100 and output a touch output signal. The transmission electrode 120 outputs a transmission signal in response to a transmission control signal from the touch control module 200, and the sensing electrode 110 detects a signal for application to the touch control module 200 in response to a sensing control signal from the touch control module 200, and the touch control module 200 enables the sensing electrode 110 and the transmission electrode 120 according to a preset pattern.
In the detection step S10, the touch sensing unit 100 detects whether there is manipulation by the operator in response to a control signal from the touch control module 200. As described above, the touch control module 200 includes: a touch sensor control unit 21 configured to apply a transmission control signal to the transmission electrode 120 and a sensing control signal to the sensing electrode 110, and control the activation of the transmission electrode 120 and the sensing electrode 110; a signal processing unit 23 configured to process a signal detected by the sensing electrode 110; and a signal output unit 25 configured to output the signal processed by the signal processing unit 23 to the outside. The detection step S10 includes one or more of a self capacitance measurement mode detection step S11, a mutual capacitance measurement mode detection step S13, and a combined capacitance measurement mode detection step S15.
In the self-capacitance measurement mode detection step S11, the sensing electrode 110 is enabled and the transmitting electrode 120 is disabled to measure the self-capacitance value by the touch sensing unit 100. In the mutual capacitance measurement mode detection step S13, the sensing electrode 110 is disabled and the transmitting electrode 120 is enabled to measure the mutual capacitance value by the touch sensing unit 100. In a combined capacitance measurement mode detection step S15, the sensing electrode 110 and the transmitting electrode 120 are enabled to measure a combined capacitance value.
According to circumstances, the detecting step may be configured in various ways according to design specifications, for example, selectively or alternately performed by a predetermined input or selection by a user, but in this embodiment may take a configuration in which individual measurement modes are simultaneously or sequentially selected by a single touch sensing unit 100.
Thereafter, the signal processing unit 23 of the touch control module 200 performs a signal pattern analysis step S20. In the signal pattern analysis step S20, the signal processing unit 23 of the touch control module 200 analyzes and confirms the sensing signal detected in the detection step S10, and determines whether there is a contact and a touch operation of the operator.
The signal pattern analysis step S20 includes a human body touch confirmation step (S20 a, S21, and S211), a touch manipulation confirmation step (S23, S231, S233, S235, S237, and S239), and an idle state control confirmation step (S25 and S251).
In the human body touch confirmation step (S20 a, S21, and S211), the signal processing unit 23 of the touch control module 200 determines and confirms whether the body of the operator touches the touch sensing unit 100. More specifically, the touch control module 200 further includes a storage unit 30, and the storage unit 30 is configured to store preset data including an initial value. The human body touch confirmation step (S20 a, S21, and S211) includes a differential capacitance confirmation step S20a, a human body touch determination step S21, and a human body touch setting step S211.
In the differential capacitance confirmation step S20a, the signal processing unit 23 of the touch control module 200 confirms whether the touch sensing unit 100 is in an idle state (idle=on), and the sensing electrode of the touch sensing unit 100 confirms the differential capacitance value, which is the difference between the actual capacitance value and the reference value, from the sensing signal. If there is no value in the previous step, an initial value is used. The reference value may be formed to follow the actual current capacitance value in a preset manner (e.g., in a manner of averaging the capacitance value in the previous step and the current capacitance value or forming a proportional arithmetic expression). This is just one example, and the arithmetic expression or structure of the reference value may be formed in various ways within the scope of taking a method of reflecting and following the actual current capacitance value.
In the human touch determination step S21, the signal processing unit 23 of the touch control module 200 compares the differential capacitance value with a preset attenuation amount included in preset data stored in the storage unit 30 to determine whether there is a human touch in the idle state of the touch sensing unit 100. In other words, as shown in fig. 7, in the case of the human body touch state, when the difference between the current capacitance value actually detected and the reference value (i.e., the difference capacitance value) is calculated, a configuration is adopted in which the capacitance value of the signal is constantly attenuated even in any one of the self capacitance measurement mode, the mutual capacitance measurement mode, and the combined capacitance measurement mode (the range between (a) and (B) of fig. 7). By using this configuration, the preset attenuation amount and the difference capacitance value included in the preset data stored in the storage unit 30 are compared with each other to determine whether there is a human touch.
With this processing, if the signal processing unit 23 of the touch control module 200 determines that the differential capacitance value is a negative number smaller than the preset attenuation amount in the human body touch determination step S21, the procedure proceeds to the human body touch setting step S211, and in this human body touch setting step S211, the signal processing unit 23 determines that the human body touch (HT) state of the operator' S body and the touch sensing unit 100 touch is on.
Thereafter, the control flow proceeds to the touch manipulation confirmation step. In the touch manipulation confirmation steps (S23, S231, S233, S235, S237, and S239), the signal processing unit 23 of the touch control module 200 determines whether the human body touch state is continued to confirm the touch manipulation intention of the operator based on the determination result of whether there is a human body touch in the human body touch confirmation steps (S21 and S211).
More specifically, the touch manipulation confirmation steps (S23, S231, S233, S235, S237, and S239) include a human body touch (HT) state determination step S23, a human body touch maintenance determination step S231, a touch maintenance counter increment step S233, a maintenance reference time elapsed determination step S235, and a touch state confirmation step S237.
In the human body touch (HT) state determining step S23, the signal processing unit 23 of the touch control module 200 determines whether the human body touch state confirmed in the human body touch confirming steps (S20 a, S21, and S211) is an on state.
If the signal processing unit 23 of the touch control module 200 determines that the human touch state confirmed in the human touch confirmation step (S20 a, S21, and S211) is not the on state, the control flow proceeds to step S25.
In contrast, if the signal processing unit 23 of the touch control module 200 determines that the human touch state confirmed in the human touch confirmation step (S20 a, S21, and S211) is an on state, the control flow proceeds to step S231.
The signal processing unit 23 of the touch control module 200 performs a human touch maintenance determining step S231 of determining whether a sensing signal indicating a touch state of the touch sensing unit 100 is sustained. In other words, although the touch state with the human body touch state of the touch sensing unit 100 is confirmed, whether the user touches the touch sensing unit 100 with a direct intention to operate the switching device or only touches the touch sensing unit 100 unintentionally can be confirmed by the touch time.
For this, a touch sustain counter increment step S233 is performed. If it is determined in the human body touch maintenance determination step S231 that the touch state is maintained, the control flow proceeds to a touch maintenance counter increment step S233, and in this touch maintenance counter increment step S233, the signal processing unit 23 of the touch control module 200 uses the counter 27 of the touch control module 200 to increment the touch maintenance counter.
In contrast, if it is determined in the human touch maintenance determination step S231 that the touch state is not maintained, the signal processing unit 23 of the touch control module 200 determines that the touch state of the user is released, switches the human touch state to off, and resets the touch maintenance counter to zero (O) so that a new idle operation is performed (S239). At this time, the control flow advances to step S25.
After the touch maintenance counter is incremented using the counter 27, the control flow proceeds to a maintenance reference time elapse determination step S235 in which the signal processing unit 23 of the touch control module 200 compares the touch maintenance time with the maintenance reference time (ts) included in the preset data after the touch maintenance counter incrementing step S233 and determines whether the touch maintenance state is maintained for a predetermined time period. In other words, if the touch maintaining state is maintained beyond the preset maintaining reference time (ts), the signal processing unit 23 of the touch control module 200 determines such a touch as a touch operation reflecting the intention of the operator, not a simple unintended touch operation.
After the maintenance reference time elapse determination step S235 is completed, the control flow proceeds to the touch state confirmation step S237 or step S25. If it is determined in the maintenance reference time elapse determination step S235 that the touch maintenance time exceeds the maintenance reference time (ts), the control flow proceeds to a touch state confirmation step S237 in which the signal processing unit 23 of the touch control module 200 switches the touch detection state of the touch sensing unit 100 to on and sets the idle state of the touch sensing unit 100 to on.
In other words, the signal processing unit 23 of the touch control module 200 determines that there is an intentional touch operation by the user and switches the touch detection state of the touch sensing unit 100 to on in such a manner: the operation state of the touch sensing unit 100 is set to an idle state "on" to form an idle state for sensing other touch operations to allow implementation of subsequent operations so that the touch maintenance state can be maintained for more than a predetermined period of time to form a signal output for a given touch operation.
On the other hand, if it is determined in the maintenance reference time elapsed determination step S235 that the touch maintenance time does not exceed the maintenance reference time (ts), the control flow proceeds to step S25, and the signal processing unit 23 of the touch control module 200 determines in step S25 whether the increased state of the touch is repeated.
Thereafter, an idle state control confirmation step (S25 and S251) is performed. In the idle state control confirmation step (S25 and S251), the signal processing unit 23 of the touch control module 200 controls the idle state of the touch sensing unit 100 based on the confirmation result of the touch manipulation intention of the operator in the touch manipulation confirmation step. In other words, if the human touch state is terminated, i.e., the capacitance value is not input any more or there is no signal change, the signal processing unit 23 of the touch control module 200 determines that there is no input signal and performs the idle state forming step S251 of reforming the idle state.
After such signal pattern analysis processing is performed, the signal processing unit 23 updates the reference value calculated in the previous step to a new reference value (S30). That is, in the reference value updating step S30, the signal processing unit 23 updates the reference value of the touch sensing unit 100 using the sensing signal calculated in the signal pattern analysis step S20. More specifically, the reference value updating step S30 includes calculating and updating the reference value using a previous difference capacitance calculated from an initial set value or a previous sensing signal included in preset data stored in the storage unit 30 and a current difference capacitance calculated from a current sensing signal in the signal pattern analyzing step.
The reference value following the capacitance value obtained in the current touch operation may be calculated by arithmetic processing using the previous difference capacitance obtained in the previous touch operation and the current difference capacitance obtained in the current touch operation, and the capacitance value obtained in the previous touch operation and the capacitance value obtained in the current touch operation.
As described above, various modifications may be made to this embodiment according to design specifications within a range of realizing a calculation structure that reflects the capacitance value of a signal based on the reference value currently sensed to calculate the difference capacitance.
The output mode performing step (S40 and S50) includes performing an output mode of determining whether to output the output signal based on the determination result performed in the signal pattern analyzing step S20. The output mode execution step (S40 and S50) includes a touch detection state determination step S40 and an output control step S50.
In the touch detection state determining step S40, the signal processing unit 23 determines whether the touch detection state is an on state. In the output control step S50, if it is determined in the touch detection state determination step S40 that the touch detection state is an on state, the signal processing unit 23 switches the touch detection state to an off state and performs control to output an output control signal to the outside through the signal output unit.
In addition, more specifically, the output control step S50 includes a signal output step S511, an output switching standby step S513, and an output signal off setting step S515.
If it is determined in the touch detection state determining step S40 that the touch detection state is an on state, the control flow proceeds to a signal outputting step S511 in which the signal processing unit 23 of the touch control module 200 switches the touch detection state to an off state and controls to output an output control signal for applying to the signal outputting unit 25 to switch the output signal to the on state to the outside.
Thereafter, the output switching standby step S513 allows waiting for a preset time included in the preset data. Then, if waiting for more than a preset time in the output switching standby step S513, the state of the output signal is switched off to interrupt the signal output from the signal output unit to the outside.
A trend of the difference capacitance value calculated based on the difference between the actual capacitance value obtained in the current touch operation and the reference value will be described with reference to the accompanying drawings. In other words, fig. 10 shows a schematic diagram illustrating sensing characteristics of sensed capacitance values/reference values and differential capacitance values of a conventional touch sensor, and fig. 11 shows a schematic diagram illustrating sensing characteristics of sensed capacitance values/reference values and differential capacitance values of a capacitive switching device according to an embodiment of the present invention. In the case of the conventional touch sensor of fig. 10, a change in an actual capacitance value and a change in a reference value according to the conventional method (see (a) of fig. 10) and a difference capacitance value calculated based on a difference between the changes (see (b) of fig. 10) are shown. In the case of the conventional method, if the differential capacitance value exceeds a predetermined threshold value, this is determined as a touch state, so that on the graph, the touch sensor determines that two touch operations are performed for one actual touch operation and one moisture content change.
On the other hand, in the case where the reference value following the actual capacitance value is used according to the embodiment of the present invention, the capacitive switching device of the present invention determines that one actual touch operation is performed based on the attenuation state of the differential capacitance value in the case of one actual touch operation, and determines that the user does not touch the touch sensing unit because the attenuation state of the differential capacitance value exceeding the predetermined value is not formed in the case of one moisture content change using the fact that the attenuation state of the capacitance value is formed if there is a direct touch of the user (see fig. 7). As a result, the capacitive switching device of the present invention determines that a total of one touch operation is performed.
The above embodiments are merely examples for illustrating the present invention, and the present invention is not limited thereto. The capacitance value formed based on the sensing signal is actually reflected to the formation of the reference value, and the present invention can be applied to fields of application of various capacitive switches other than vehicles, and the capacitive switching device of the present invention can be modified in various ways within a range in which a structure for determining whether there is a human touch based on the reference value reflecting or following the actual capacitance value is adopted.
Industrial applicability
While the present invention has been described in connection with the exemplary embodiments shown in the drawings, they are merely illustrative, and the present invention is not limited to these embodiments. Those of ordinary skill in the art will understand that various equivalent modifications and changes of the embodiments can be made without departing from the spirit and scope of the present invention. Therefore, the true technical scope of the present invention should be defined by the technical spirit of the appended claims.
Claims (16)
1. A capacitive switching device, the capacitive switching device comprising:
a touch sensing unit (100), the touch sensing unit (100) including a sensing electrode (110) and a transmitting electrode (120) disposed on a substrate (2); and
A touch control module (200) provided on the substrate (2) and configured to confirm a contact manipulation state of an operator based on a sensing signal from the touch sensing unit (100) and output a touch output signal,
Wherein the transmission electrode (120) outputs a transmission signal in response to a transmission control signal from the touch control module (200), the sensing electrode (110) detects a signal for application to the touch control module (200) in response to a sensing control signal from the touch control module (200), and
Wherein the touch control module (200) is configured to selectively enable the sense electrode (110) and the transmit electrode (120) in response to the touch output signal according to any one of a plurality of measurement modes including:
A self capacitance measurement mode in which the sensing electrode (110) is enabled, the transmitting electrode (120) is disabled, and the touch sensing unit (100) measures a self capacitance value;
-a mutual capacitance measurement mode in which the sense electrode (110) is disabled, the transmit electrode (120) is enabled, and the touch sensing unit (100) measures a mutual capacitance value; and
A combined capacitance measurement mode in which the sensing electrode (110) and the transmitting electrode (120) are enabled and the touch sensing unit (100) measures a combined capacitance value.
2. Capacitive switching device according to claim 1, wherein the sensing electrode (110) and the transmitting electrode (120) are provided on both surfaces of the substrate (2), respectively.
3. Capacitive switching device according to claim 1, wherein the sensing electrode (110) and the transmitting electrode (120) are arranged on the same surface of the substrate (2).
4. A capacitive switching device according to claim 3, wherein the transmission electrode (120) is arranged at the outer periphery of the sensing electrode (110).
5. The capacitive switching device of claim 1, wherein the touch control module (200) comprises:
a touch sensor control unit (21), the touch sensor control unit (21) being configured to apply the transmission control signal to the transmission electrode (120) and the sensing control signal to the sensing electrode (110), and to control activation of the transmission electrode (120) and the sensing electrode (110);
A signal processing unit (23), the signal processing unit (23) being configured to process signals detected by the sensing electrode (110); and
And a signal output unit (25), the signal output unit (25) being configured to output the signal processed by the signal processing unit (23) to the outside.
6. The capacitive switching device according to claim 5, wherein the touch sensor control unit (21) performs a self capacitance measurement mode enabling the sensing electrode (110) and disabling the transmitting electrode (120).
7. Capacitive switching device according to claim 5, wherein the touch sensor control unit (21) performs a mutual capacitance measurement mode disabling the sensing electrode (110) and enabling the transmitting electrode (120).
8. Capacitive switching device according to claim 5, wherein the touch sensor control unit (21) performs a combined capacitance measurement mode enabling the sensing electrode (110) and the transmitting electrode (120).
9. A method of controlling a capacitive switching device, the method comprising the steps of:
Providing step of providing the capacitive switching device, the capacitive switching device comprising a touch sensing unit (100) and a touch control module (200), the touch sensing unit (100) comprising a sensing electrode (110) and a transmission electrode (120) arranged on a substrate (2), the touch control module (200) being arranged on the substrate (2) and configured to confirm a contact manipulation state of an operator and to output a touch output signal based on the sensing signal from the touch sensing unit (100), wherein the transmission electrode (120) outputs a transmission signal in response to the transmission control signal from the touch control module (200), the sensing electrode (110) detects a signal in response to the sensing control signal from the touch control module (200) for application to the touch control module (200), and wherein the touch control module (200) is configured to selectively enable the sensing electrode (110) and the transmission electrode (120) in response to the touch output signal according to any one of a plurality of measurement modes, the measurement modes comprising:
A self capacitance measurement mode in which the sensing electrode (110) is enabled, the transmitting electrode (120) is disabled, and the touch sensing unit (100) measures a self capacitance value;
-a mutual capacitance measurement mode in which the sense electrode (110) is disabled, the transmit electrode (120) is enabled, and the touch sensing unit (100) measures a mutual capacitance value; and
-A combined capacitance measurement mode in which the sensing electrode (110) and the transmitting electrode (120) are enabled and the touch sensing unit (100) measures a combined capacitance value;
A detection step (S10) of enabling the touch sensing unit (100) to detect whether there is manipulation of the operator in response to a control signal from the touch control module (200);
A signal pattern analysis step (S20) of analyzing and confirming the sensing signal detected in the detection step (S10) and determining whether or not there is a touch and touch operation of the operator;
a reference value updating step (S30) of updating a reference value of the touch sensing unit (100) using the sensing signal calculated in the signal pattern analysis step (S20); and
An output mode execution step (S40) of executing an output mode for determining whether or not to output an output signal based on a result of the determination executed in the signal pattern analysis step (S20).
10. The method of claim 9, wherein the touch control module (200) comprises: a touch sensor control unit (21), the touch sensor control unit (21) being configured to apply the transmission control signal to the transmission electrode (120) and the sensing control signal to the sensing electrode (110), and to control activation of the transmission electrode (120) and the sensing electrode (110); a signal processing unit (23), the signal processing unit (23) being configured to process signals detected by the sensing electrode (110); and a signal output unit (25), the signal output unit (25) being configured to output the signal processed by the signal processing unit (23) to the outside, and
Wherein the detecting step (S10) includes one or more of a step (S11), a step (S13) and a step (S15), the step (S11) detecting a self capacitance measurement mode in which the sensing electrode (110) is enabled and the transmitting electrode (120) is disabled, the step (S13) detecting a mutual capacitance measurement mode in which the sensing electrode (110) is disabled and the transmitting electrode (120) is enabled, the step (S15) detecting a combined capacitance measurement mode in which the sensing electrode (110) and the transmitting electrode (120) are enabled, the self capacitance measurement mode, the mutual capacitance measurement mode and the combined capacitance measurement mode being performed by the touch sensor control unit (21).
11. The method according to claim 10, wherein the signal pattern analysis step (S20) comprises the steps of:
A human body touch confirmation step (S20 a, S21, and S211) of determining and confirming whether the body of the operator touches the touch sensing unit (100);
A touch manipulation confirmation step (S23, S231, S233, S235, S237, and S239) of determining whether a human body touch state is continued based on a result of the determination of whether there is a human body touch in the human body touch confirmation step (S21 and S211) to confirm a touch manipulation intention of the operator; and
An idle state control confirmation step (S25 and S251) of controlling an idle state of the touch sensing unit (100) based on a result of confirmation of a touch manipulation intention of the operator in the touch manipulation confirmation step.
12. The method of claim 11, wherein the touch control module (200) further comprises a storage unit (30), the storage unit (30) being configured to store preset data including an initial value, and
Wherein the human body touch confirmation step (S20 a, S21, and S211) includes the steps of:
A difference capacitance confirmation step (S20 a) of confirming whether the touch sensing unit (100) is in an idle state, wherein idle = on, and enabling the sensing electrode of the touch sensing unit (100) to confirm a difference capacitance value from the sensing signal as a difference between an actual capacitance value and a reference value;
A human body touch determining step (S21) of comparing the differential capacitance value with a preset attenuation amount included in the preset data stored in the storage unit (30) to determine whether there is a human body touch in the idle state of the touch sensing unit (100); and
A human body touch setting step (S211) of determining a human body touch HT state in which the body of the operator touches the touch sensing unit (100) as on if the differential capacitance value is a negative value smaller than the preset attenuation amount in the human body touch determining step (S21).
13. The method according to claim 12, wherein the touch manipulation confirmation step (S23, S231, S233, S235, S237, and S239) includes the steps of:
A human body touch HT state determination step (S23) of determining whether the human body touch state confirmed in the human body touch confirmation steps (S20 a, S21, and S211) is an on state;
a human body touch maintenance determination step (S231) of determining whether a sensing signal indicating a touch state of the touch sensing unit (100) is continued, if it is determined that the human body touch state is an on state in the human body touch confirmation steps (S20 a, S21, and S211);
a touch maintenance counter increasing step (S233) of increasing a touch maintenance counter using a counter (27) of the touch control module (200) if it is determined in the human touch maintenance determining step (S231) that the touch state is maintained;
a maintenance reference time elapse determination step (S235) of comparing the touch maintenance time with a maintenance reference time ts included in the preset data after the touch maintenance counter increment step (S233), and determining whether the touch maintenance state is maintained for a predetermined time period; and
A touch state confirmation step (S237) of switching the touch detection state of the touch sensing unit (100) to on and setting the idle state of the touch sensing unit (100) to on if it is determined in the maintenance reference time elapse determination step (S235) that the touch maintenance time exceeds the maintenance reference time ts.
14. The method according to claim 13, wherein the reference value updating step (S30) includes the steps of: the reference value is calculated and updated using a previous difference capacitance calculated from an initial set value or a previous sensing signal and a current sensing signal in the signal pattern analysis step.
15. The method according to claim 14, wherein the output mode performing step (S40 and S50) comprises the steps of:
a touch detection state determination step (S40) of determining whether or not the touch detection state is an on state (S40); and
An output control step (S50) of, if it is determined in the touch detection state determination step (S40) that the touch detection state is an on state, switching the touch detection state to an off state and controlling to output an output control signal to the outside through the signal output unit (S50).
16. The method according to claim 15, wherein the output control step (S50) includes the steps of:
A signal outputting step (S511) of, if it is determined in the touch detection state determining step (S40) that the touch detection state is an on state, switching the touch detection state to an off state and controlling to output the output control signal for application to the signal outputting unit to switch an output signal to an on state to the outside;
An output switching standby step (S513), the output switching standby step (S513) waiting for a preset time included in the preset data; and
An output signal off setting step (S515) of switching off the state of the output signal to interrupt the signal output from the signal output unit to the outside if the waiting for more than the preset time is performed in the output switching standby step (S513).
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