TWI811953B - Touch sensing circuit and touch judging method - Google Patents

Abstract

A touch sensing circuit and a touch judging method are disclosed. The touch sensing circuit includes a charge and discharge control unit, a sensing capacitor, a clock counter and a feature judgment unit. The charge and discharge control unit connects to a power source and the charge and discharge control unit controls the charging and discharging of the sensing capacitor. The clock counter connects to the sensing capacitor for counting the numbers of the clock signal during a charge and discharge cycle of the sensing capacitor. The feature judgment unit stores a plurality of abnormal state features in the storage module. The feature capture module captures the pattern feature of the clock numbers. The comparison module compares whether the pattern feature belongs to the plurality of abnormal state features, so as to determine whether the touch sensing circuit receives a touch operation.

Description

Touch sensing circuit and touch judgment method

The present invention relates to a touch sensing circuit and a touch judgment method, and in particular to a touch sensing circuit and a judgment method that can correctly judge a touch operation without being affected by noise and causing misjudgments.

The operating interface of an electronic device is often equipped with a touch sensing device, such as a touch screen or a button, which determines the operator's touch actions to create an interface for input or operation of the electronic device. The judgment of touch actions by the interfaces of these devices will directly affect the accuracy and performance of the device operation. If other components of the electronic device or noise from the external operating environment affect the touch sensing device, false touches may occur. The electronic device is judged to execute wrong operating procedures. These unexpected actions may have adverse effects on the power consumption, processing performance, sensing results, etc. of the electronic device.

Existing touch sensing devices can detect the sensing capacitance of the sensor through a counter, and determine whether a touch operation is received by measuring the charging and discharging cycle of the sensing capacitance. Specifically, when the touch sensing device at a specific position is touched by the user, the user's finger contact will increase the sensing capacitance, thereby increasing the charge and discharge cycle time. Therefore, if the counter detects that the charging and discharging cycle time of the sensing capacitor increases, it can be determined that this position has been touched by the user, and subsequent touch operations can be performed. However, the sensing capacitor may be affected by other circuit components and receive other noise that affects the charging and discharging time, causing the detected cycle time to also exceed the preset value and be misjudged as a touch action, but not an actual touch. operation, thereby affecting the operation of electronic devices.

In summary, the inventor of the present invention thought about and designed a touch sensing circuit and a touch judgment method in order to improve the problems of the conventional technology and thereby enhance industrial implementation and utilization.

In view of the problems described in the prior art, the purpose of the present invention is to provide a touch sensing circuit and a touch judgment method to avoid the problem of noise being misjudged as touch signals and causing erroneous operation of electronic devices.

Based on the above objectives, the present invention provides a touch sensing circuit, which includes a charge and discharge control unit, a sensing capacitor, a timing counter and a feature judgment unit. The charge and discharge control unit is connected to the current source. The induction capacitor is connected to the charge and discharge control unit, and the charge and discharge of the induction capacitor is controlled by the charge and discharge control unit. The timing counter is connected to the sensing capacitor and counts the timing number of charge and discharge cycles of the sensing capacitor. The feature judgment unit includes a storage module, a feature acquisition module and a comparison module. The storage module stores a plurality of abnormal state features. The feature judgment unit receives the time series quantity and retrieves the pattern features of the time series quantity through the feature acquisition module. , and the comparison module compares whether the pattern characteristics belong to a plurality of abnormal state characteristics to determine whether the touch sensing circuit performs a touch operation.

Preferably, when the touch sensing circuit is in the training mode, the feature judgment unit receives the noise timing number of the sensing capacitor, captures the noise characteristics of the noise timing number through the feature acquisition module, and adds it to the storage module. Multiple abnormal status characteristics.

Preferably, the feature extraction module performs first-order differentiation on the temporal quantity, and uses the obtained plural differential values as pattern features of the temporal quantity.

Preferably, the feature extraction module performs fast Fourier transformation on the time series quantity, and uses the obtained plural frequency response values as the pattern features of the time series quantity.

Preferably, the touch sensing circuit further includes a low-pass filter connected to the timing counter, and the low-pass filter removes instantaneous quantity changes that appear in the timing quantity.

Based on the above objectives, the present invention provides a touch judgment method, which is suitable for a touch sensing circuit. The touch sensing circuit includes a charge and discharge control unit, a sensing capacitor, a timing counter and a feature judgment unit. The touch judgment method includes: storing a plurality of abnormal state characteristics in the storage module of the characteristic judgment unit; using the current provided by the charge and discharge control unit to perform the charge and discharge process on the sensing capacitor; and monitoring the charge and discharge of the charge and discharge process through a timing counter. cycle, calculate the timing number of charge and discharge cycles; capture the pattern features of the timing quantity through the feature acquisition module of the feature judgment unit; and compare the pattern features with a plurality of abnormal state features through the comparison module of the feature judgment unit , determine whether the touch sensing circuit is a touch operation.

Preferably, the touch judgment method further includes: when the touch sensing circuit is in the training mode, receiving the noise timing quantity of the sensing capacitor through the feature judgment unit, and capturing the noise timing quantity through the feature acquisition module. Noise characteristics, adding multiple abnormal status characteristics in the storage module.

Preferably, the feature extraction module performs first-order differentiation on the temporal quantity, and uses the obtained plural differential values as pattern features of the temporal quantity.

Preferably, the feature extraction module performs fast Fourier transformation on the time series quantity, and uses the obtained plural frequency response values as the pattern features of the time series quantity.

Preferably, the touch judgment method further includes: using a low-pass filter to remove instantaneous quantity changes that appear in the timing quantity.

Based on the above, the touch sensing circuit and touch determination method of the present invention may have one or more of the following advantages:

(1) This touch sensing circuit and touch judgment method can monitor the cycle time of the charging and discharging process of the sensing capacitor, and determine whether the touch sensing circuit actually receives a touch operation through feature acquisition and comparison. , improve the accuracy of touch judgment and prevent the touch sensing circuit from judging abnormal noise as touch signals and affecting the operation of the device.

(2) This touch sensing circuit and touch judgment method can store a variety of different noise characteristics through the machine learning training mode, and are suitable for various types of noise judgment, making the judgment of the touch sensing circuit more complete. sex and comprehensiveness, increasing its scope of application.

(3) This touch sensing circuit and touch judgment method can filter out instantaneous changing signals through a low-pass filter, reducing the impact of noise on the timing counter, and improving the stability and reliability of device operation.

10,20:Touch sensing circuit

11,21: Charge and discharge control unit

12,22: Inductive capacitance

13,23: Timing counter

14,24: Feature judgment unit

14A, 24A: Storage module

14B, 24B: Feature extraction module

14C, 24C: Comparison module

25: Low pass filter

111,211:Current source

131: Clock signal

141: Abnormal status characteristics

142:Mode characteristics

143:Judgment result

A:node

S01~S05, S11~S17: steps

In order to make the technical features, content and advantages of the present invention and the effects it can achieve more obvious, the present invention is described with the following drawings: Figure 1 is a schematic diagram of a touch sensing circuit according to an embodiment of the present invention. .

Figure 2A is a schematic diagram of timing counter monitoring according to an embodiment of the present invention.

Figure 2B is a schematic diagram of the charging and discharging cycle time and the preset threshold according to the embodiment of the present invention.

Figure 2C is a schematic diagram of the abnormal state characteristics of the embodiment of the present invention.

Figure 2D is a schematic diagram of abnormal state characteristics of another embodiment of the present invention.

Figure 3 is a schematic diagram of a touch sensing circuit according to another embodiment of the present invention.

Figure 4 is a flow chart of a touch determination method according to an embodiment of the present invention.

Figure 5 is a flow chart of a touch determination method according to another embodiment of the present invention.

In order to help the review committee understand the technical features, content and advantages of the present invention and the effects it can achieve, the present invention is described in detail below in conjunction with the accompanying drawings and in the form of embodiments. The drawings used therein are as follows. The subject matter is only for illustration and auxiliary description, and does not necessarily represent the actual proportions and precise configurations after implementation of the present invention. Therefore, the proportions and configuration relationships of the attached drawings should not be interpreted to limit the scope of rights of the present invention in actual implementation. Let’s explain first.

Please refer to Figure 1. Figure 1 is a schematic diagram of a touch sensing circuit according to an embodiment of the present invention. As shown in the figure, the touch sensing circuit 10 includes a charge and discharge control unit 11, a sensing capacitor 12, a timing counter 13 and a feature judgment unit 14. In this embodiment, each unit and the processing module contained therein can be a circuit or a chip. way to achieve. The charge and discharge control unit 11 is connected to the current source 111, and controls the current source 111 to provide electric energy to charge and discharge the inductive capacitor 12, and monitors the charge and discharge cycle of the inductive capacitor 12 by detecting the voltage of the node A. The touch sensing circuit 10 can be provided in the operation or input interface of various electronic devices and handheld devices, such as the touch screen of a smart phone or tablet computer. The touch sensing circuit 10 is installed at the corresponding touch position of the screen or panel to Detect user's touch actions. The sensing capacitor 12 is coupled to the touch sensing pad at the corresponding position. When the user's finger touches the sensing pad at a specific position, the sensing capacitance 12 at this position will increase due to contact with the finger, and the corresponding charging and discharging time will also increase. will increase with In addition, by monitoring the time changes of the charge and discharge cycle, it can be determined whether the corresponding position receives a touch action.

The timing counter 13 is connected to the sensing capacitor 12. During each charge and discharge cycle, the timing counter 13 counts the charge and discharge cycles through the clock signal 131, and obtains the elapsed time of the charge and discharge cycle through the number of the clock signal 131. . Please refer to Figure 2A. Figure 2A is a schematic diagram of timing counter monitoring according to an embodiment of the present invention. As shown in the figure, when the node A of the sensing capacitor 12 receives n clock signals 131 during the first cycle of charging and discharging, that is, the time of n clock signals has elapsed during the charging and discharging cycle. The timing counter 13 continuously monitors each charge and discharge cycle, and determines the time of the charge and discharge cycle based on the number of clock signals obtained. For example, the second cycle is still n clock signals, and the third cycle becomes m. The time of the clock signal.

As mentioned above, the time of the charge and discharge cycle is the basis for determining whether there is a touch action. When the time of the charge and discharge cycle increases beyond the preset threshold range, it can be determined that a touch operation occurs at this touch position. Please refer to Figure 2B. Figure 2B is a schematic diagram of the charge and discharge cycle time and the preset threshold according to the embodiment of the present invention. Please also refer to Figure 2A. During the charge and discharge cycle, the time increases from the time of n clock signals to the time of m clock signals. Since the time of m clock signals exceeds the preset threshold, the touch sensing The circuit 10 will determine that the touch operation is received in the third cycle.

However, the influence of other components of the electronic device or signal interference generated in special operating environments may affect the charge and discharge cycle time of the inductive capacitor 12, such as when the electronic device is subjected to electromagnetic susceptibility (Electro-Magnetic Susceptibility, EMS) testing. Or when the voice system plays sounds, noise will continue to enter the system and the charge and discharge cycle time will continue to change. That is, the number of clock signals 131 obtained by the timing counter 13 will continue to change values, causing the count value to continue to exceed the preset threshold. The touch sensing circuit 10 is allowed to incorrectly determine a touch action. Therefore, the touch sensing circuit 10 is provided with feature judgment The unit 14 is connected to the timing counter 13, and uses the characteristic judgment unit 14 to analyze whether the change in the charge and discharge cycle is caused by the actual touch action or other reasons, and then correctly determines whether there is a touch operation.

The feature judgment unit 14 includes a storage module 14A, a feature acquisition module 14B and a comparison module 14C. The storage module 14A stores a plurality of abnormal state features 141. For changes in the charge and discharge cycles caused by the above test actions, the The corresponding abnormal state characteristics are stored in the storage module 14A in advance. After the feature judgment unit 14 receives the timing number of the timing counter 13, the pattern feature 142 of the timing number is captured through the feature acquisition module 14B, and then the pattern feature 142 is compared through the comparison module 14C to see whether the pattern feature 142 belongs to a pre-stored abnormal state. Feature 141 is used to determine whether the touch sensing circuit 10 actually generates a touch operation or whether other abnormal operations cause changes in the charge and discharge cycle, and finally outputs the corresponding judgment result 143.

Please refer to Figure 2C. Figure 2C is a schematic diagram of the abnormal state characteristics of the embodiment of the present invention. As shown in the figure, when performing the electromagnetic endurance test, the number of counts obtained by the timing counter 13 is as shown in the upper half of Figure 2C, and its value obviously exceeds the preset threshold. However, the test operation is not a touch action. If it is misjudged For touch actions, subsequent touch signals will cause incorrect operation of the device. Therefore, the count number received by the feature determination unit 14 determines whether it is an actual touch operation by capturing the pattern feature 142 through the feature capture module 14B. In this embodiment, the feature extraction module 14B performs first-order differentiation on the temporal quantity, and uses the obtained plural differential values as the pattern features 142 of the temporal quantity, as shown in the lower half of Figure 2C . The comparison module 14C then compares whether the distribution of these differential values matches the abnormal state characteristics 141 in the storage module 14A. If it matches, it is judged to be an abnormal state operation. If it does not match, it is judged to be a normal touch operation. .

Please refer to Figure 2D. Figure 2D is a schematic diagram of abnormal state characteristics of another embodiment of the present invention. As shown in the figure, when the voice system plays sound, the voltage source is affected by the load of the speaker, causing the voltage to produce a noise waveform similar to the sound waveform. The number of counts obtained by the timing counter 13 As shown in the upper half of Figure 2D, the value clearly exceeds the preset threshold, but the operation of playing the sound is not a touch action. If it is misjudged as a touch action, subsequent touch signals will cause the device to operate incorrectly. Therefore, the count number received by the feature determination unit 14 determines whether it is an actual touch operation by capturing the pattern feature 142 through the feature capture module 14B. In this embodiment, the feature acquisition module 14B converts the count feature signal into the frequency domain by performing Fast Fourier Transform (FFT) on the time series quantity, and uses the obtained plural frequency responses as pattern features of the time series quantity. 142, as shown in the lower half of Figure 2D. Generally, the frequency response of voice signals falls around 20Hz~4KHz. The count value of effective touch signals has a frequency response close to the DC value, which can be effectively distinguished. The comparison module 14C can compare the conversion result with the abnormal state characteristics 141 in the storage module 14A, such as frequency response characteristics such as frequency range and specific frequency magnitude, to determine whether it is a false touch action. In the present disclosure, the abnormal state characteristics may be composed of a plurality of differential values of first-order differentials, or may be frequency response characteristics of fast Fourier transform, but the disclosure is not limited thereto. In other embodiments, the abnormal state characteristics may also be Other feature extraction methods are available.

Please refer to Figure 3. Figure 3 is a schematic diagram of a touch sensing circuit according to another embodiment of the present invention. As shown in the figure, the touch sensing circuit 20 includes a charge and discharge control unit 21, a sensing capacitor 22, a timing counter 23, a feature judgment unit 24 and a low-pass filter 25. The charge and discharge control unit 21 is connected to the current source 211, and controls the current source 211 to provide electric energy to charge and discharge the inductive capacitor 22, and monitors the charge and discharge cycle of the inductive capacitor 22 by detecting the voltage of the node A. The timing counter 23 is connected to the sensing capacitor 22 and determines whether a touch operation occurs at the corresponding touch position by calculating the time of each charge and discharge cycle of the sensing capacitor 22 .

In this embodiment, the count number of the timing counter 23 will first pass through the low-pass filter 25 before entering the feature judgment unit 24 for feature acquisition and judgment. The low-pass filter 25 can convert the timing number into Remove instantaneous number changes that occur in electronic devices, such as noise interference generated in electronic devices, causing the count number to suddenly increase or decrease in a short period of time. Setting the low-pass filter 25 can filter out the abnormal interference that occurs and avoid misjudgment by the touch sensing circuit 20 . However, as in the electromagnetic endurance test described in the previous embodiment, the abnormality in the count will last for a certain period of time and is difficult to filter out even with the low-pass filter 25. Therefore, it is still necessary to use the characteristic judgment unit 24 to determine whether it is a touch. control operation.

The feature judgment unit 24 includes a storage module 24A, a feature acquisition module 24B and a comparison module 24C. The storage module 24A stores a plurality of abnormal state features. When the feature judgment unit 24 receives the timing numbers that pass the low-pass filter 25 , the feature acquisition module 24B acquires the pattern features of the sequential number, and then the comparison module 24C compares whether the pattern features belong to the stored abnormal state features, thereby determining whether the touch sensing circuit 20 is a touch operate. Please refer to the foregoing embodiments for the feature extraction operation, and the same technology will not be described again.

In addition, it should be noted that in the feature judgment unit 24, the plurality of abnormal state features stored in the storage module 24A can be stored in files in recorded data formats such as numerical values and sequences. However, this embodiment is not limited to this. In other cases, In embodiments, different abnormal state characteristics can be added to the storage module 24A through training. For example, the touch sensing circuit 20 actually receives different test operations, and the timing counter 23 records the timing number of the sensing capacitor 22 and transmits it as the noise timing number to the feature judgment unit 24, through the feature acquisition module 24B The noise characteristics of the noise timing quantity are captured, for example, the first-order differential is used to obtain the differential value of the noise timing quantity, and then the sequence of these differential values is added to the storage module 24A as one of the abnormal state characteristics for determining abnormal operations.

Please refer to Figure 4. Figure 4 is a flow chart of a touch determination method according to an embodiment of the present invention. The touch judgment method is applicable to the touch sensing circuit of the aforementioned embodiment. The touch sensing circuit includes charging and discharging Electrical control unit, sensing capacitor, timing counter and feature judgment unit. As shown in the figure, the touch judgment method includes the following steps (S01~S05):

Step S01: Store a plurality of abnormal state characteristics. A plurality of abnormal state characteristics are stored in the storage module of the characteristic judgment unit. These characteristics can be stored in files in recorded data formats such as numerical values and sequences.

Step S02: Perform charging and discharging procedures on the sensing capacitor. The charging and discharging control unit is connected to the current source, and through the control of the charging and discharging control unit, the current source provides current to the sensing capacitor, and performs the process of charging and discharging the sensing current.

Step S03: Monitor the charging and discharging cycles of the charging and discharging program, and calculate the timing number of the charging and discharging cycles. The sensing capacitor is connected to the timing counter, and the timing counter can receive the clock signal. By calculating the number of clock signals that the sensing capacitor passes through in a charge and discharge cycle, the timing number is obtained as the elapsed time of this charge and discharge cycle. Through the timing Whether the number exceeds the preset threshold, it is judged that the sensing capacitor is touched.

Step S04: Extract the pattern features of the time series quantity. Since it is difficult to determine whether the touch sensing circuit actually accepts a touch operation or is affected by other abnormal operations by only comparing the timing number with the preset threshold, the timing number obtained in the previous step is further input to the feature judgment unit for processing. judge. The feature judgment unit uses the feature acquisition module to capture the pattern features of the time series quantity, for example, calculates the first-order differential value of the time series quantity, and uses the sequence formed by each differential value as the pattern feature to be analyzed. In other embodiments, the conversion result of the frequency response can also be used as the mode feature to be analyzed through fast Fourier transformation.

Step S05: Compare the mode characteristics and a plurality of abnormal state characteristics to determine whether the touch sensing circuit is a touch operation. The pattern features to be analyzed can be determined by the comparison module in the feature judgment unit. Compare whether the pattern characteristics match the abnormal state characteristics in the storage module, that is, whether the pattern characteristics and the abnormal state characteristics are consistent or similar. If it matches, it is judged that the operation is in an abnormal state; if it does not match, it is judged that it is a normal touch operation.

Please refer to Figure 5. Figure 5 is a flow chart of a touch determination method according to another embodiment of the present invention. The touch judgment method is applicable to the touch sensing circuit of the aforementioned embodiment. The touch sensing circuit includes a charge and discharge control unit, a sensing capacitor, a timing counter, a feature judgment unit and a low-pass filter. As shown in the figure, the touch judgment method includes the following steps (S11~S15):

Step S11: Acquire the noise characteristics of the noise timing number through the characteristic acquisition module, and add a plurality of abnormal state characteristics in the storage module. When the touch sensing circuit is in the training mode, the feature judgment unit receives the noise timing quantity of the sensing capacitor, and the feature acquisition module captures the noise characteristics of the noise timing quantity, and uses this noise characteristic as An abnormal status characteristic that is added to the plurality of abnormal status characteristics in the storage module. Through the machine learning training mode, a variety of different abnormal conditions can be learned in advance and recorded in the storage module, providing comparison when the actual situation occurs.

Step S12: Store a plurality of abnormal state characteristics. In addition to the abnormal state features stored in the training mode in the previous step, multiple abnormal state features in the original historical records can also be stored in the storage module of the feature judgment unit.

Step S13: Perform charging and discharging procedures on the sensing capacitor. The charging and discharging control unit is connected to the current source, and through the control of the charging and discharging control unit, the current source provides current to the sensing capacitor, and performs the process of charging and discharging the sensing current.

Step S14: Monitor the charging and discharging cycles of the charging and discharging program, and calculate the timing number of the charging and discharging cycles. The sensing capacitor is connected to the timing counter, and the timing counter can receive the clock signal. By calculating the number of clock signals that the inductive capacitor passes through during a charge and discharge cycle, the timing number is obtained as the elapsed time of this charge and discharge cycle.

Step S15: Remove the instantaneous quantity changes that appear in the temporal quantity. A low-pass filter is provided between the timing counter and the feature judgment unit. The low-pass filter removes the instantaneous quantity changes that appear in the timing quantity, thereby reducing the impact of noise interference on touch judgment.

Step S16: Extract the pattern features of the time series quantity. The timing quantity through the low-pass filter is input to the feature judgment unit for judgment. The feature judgment unit extracts the pattern characteristics of the timing quantity through the feature acquisition module, such as calculating the first-order differential value of the timing quantity, and forming each differential value into Sequences serve as pattern features to be analyzed. In other embodiments, the conversion result of the frequency response can also be used as the mode feature to be analyzed through fast Fourier transformation.

Step S17: Compare the mode characteristics and a plurality of abnormal state characteristics to determine whether the touch sensing circuit is a touch operation. The pattern characteristics to be analyzed can be compared by the comparison module in the feature judgment unit to determine whether the pattern characteristics match the abnormal state characteristics in the storage module, that is, whether the pattern characteristics and the abnormal state characteristics are consistent or similar. If it matches, it is judged that the operation is in an abnormal state; if it does not match, it is judged that it is a normal touch operation.

The above is only illustrative and not restrictive. Any equivalent modifications or changes that do not depart from the spirit and scope of the present invention shall be included in the appended patent scope.

10:Touch sensing circuit

11: Charge and discharge control unit

12: Sensing capacitance

13: Timing counter

14: Feature judgment unit

14A:Storage module

14B: Feature extraction module

14C: Comparison module

111:Current source

131: Clock signal

141: Abnormal status characteristics

142:Mode characteristics

143:Judgment result

A:node

Claims (10)

A touch sensing circuit, which includes: a charge and discharge control unit connected to a current source; an induction capacitor connected to the charge and discharge control unit, and the charge and discharge control unit controls the charge and discharge of the induction capacitor; a sequence counter connected to the sensing capacitor to calculate a sequential number of charge and discharge cycles of the sensing capacitor; and a feature judgment unit including a storage module, a feature acquisition module and a comparison module, the storage module The group stores a plurality of abnormal state characteristics. The characteristic judgment unit receives the timing number and retrieves a pattern feature of the timing quantity through the feature acquisition module, and compares whether the pattern feature belongs to the plurality through the comparison module. Abnormal status characteristics are used to determine whether the touch sensing circuit is a touch operation. The touch sensing circuit as described in claim 1, wherein when the touch sensing circuit is in a training mode, the feature judgment unit receives a noise timing quantity of the sensing capacitor and captures it through the feature acquisition module. A noise characteristic of the noise timing number is taken and added to the plurality of abnormal state characteristics in the storage module. The touch sensing circuit as described in claim 1, wherein the feature acquisition module performs first-order differentiation on the timing quantity and uses the plurality of obtained differential values as the pattern characteristics of the timing quantity. The touch sensing circuit as described in claim 1, wherein the feature acquisition module performs fast Fourier transformation on the timing number and uses the plurality of frequency response values obtained as the pattern characteristics of the timing number. The touch sensing circuit as described in claim 1 further includes a low-pass filter connected to the timing counter, and the low-pass filter removes instantaneous quantity changes that appear in the timing quantity. A touch judgment method is applicable to a touch sensing circuit. The touch sensing circuit includes a charge and discharge control unit, a sensing capacitor, a timing counter and a feature judgment unit. The touch judgment method includes: A plurality of abnormal state characteristics are stored in a storage module of the characteristic judgment unit; a charge and discharge process is executed on the induction capacitor by the current provided by the charge and discharge control unit; and a charge and discharge process of the charge and discharge process is monitored by the timing counter. Discharge cycle, calculate a timing number of the charge and discharge cycle; capture a pattern feature of the timing quantity through a feature acquisition module of the feature judgment unit; and use a comparison module of the feature judgment unit to compare Based on the mode characteristics and the plurality of abnormal state characteristics, it is determined whether the touch sensing circuit is a touch operation. The touch judgment method as described in claim 6, further comprising: when the touch sensing circuit is in a training mode, receiving a noise timing quantity of the sensing capacitor through the characteristic judgment unit, and capturing the signal through the characteristic. The acquisition module acquires a noise characteristic of the noise timing quantity, and adds the plurality of abnormal state characteristics in the storage module. The touch judgment method as described in claim 6, wherein the feature acquisition module passes Perform a first-order differential on the timing quantity, and use the obtained plural differential values as the pattern characteristics of the timing quantity. The touch determination method as described in claim 6, wherein the feature acquisition module performs a fast Fourier transform on the timing number, and uses the plurality of frequency response values obtained as the pattern features of the timing number. The touch judgment method as described in claim 6 further includes: using a low-pass filter to remove instantaneous quantity changes that appear in the timing quantity.