TWI698779B - Method for processing touch signal and signal processing system using same - Google Patents

Abstract

A method for processing touch signal and a signal processing system using the same are provided. First in the method, a touch panel having multiple touch points for generating touch signals and a detecting circuit including a virtual touch element are provided. When the detecting circuit is connected to the touch point in a way of bypassing the virtual touch element, a baseline signal can be acquired by the detecting circuit. When the detecting circuit is connected to the touch point via the virtual touch element, a reaction signal can be acquired by the detecting circuit. A reaction interval can be acquired based on the baseline and the reaction signals. The touch signal can be compensated according to the reaction interval. The signal deviation of touch detection caused by manufacturing factors or by operating in a different environment can be alleviated, and the accuracy of touch detection can be improved.

Description

Signal processing method of touch signal and signal processing system using the same

The present invention relates to a signal processing method for touch signals and a signal processing system using the same, and more particularly to a touch signal processing method for improving the touch accuracy of a touch panel and a signal processing system using the same.

With the development of touch technology, the market has extremely high requirements for the quality of touch panels, whether in terms of appearance, thickness, touch sensitivity, and integration with display devices, all relevant industries have worked hard to develop direction. Also because of the market's expectations for high-quality touch panels, manufacturers in related fields have been tested for their technical capabilities at various stages, including circuit design, process improvement, and signal processing.

In the production process of touch panels, even in the same plant and the same production line, there will inevitably be differences between touch panels of the same batch. Possible reasons include variation in material properties, Process parameter deviation, environmental factor changes, equipment errors, etc., will cause differences between touch panels over time. Such a difference will cause the touch panel to have inconsistent characteristics after leaving the factory. In addition, when the touch panel leaves the production line and enters the operation After operating the environment, the operating environment will vary greatly due to factors such as temperature, humidity, cleanliness, and various environmental noises. The original touch detection settings set at the factory will cause problems that are not applicable to the operating environment. For example, when detecting the intensity of the touch signal, there will be a difference, which affects the accuracy of the touch panel in detecting the touch signal. In severe cases, it will lead to misjudgment and affect the touch quality of electronic products.

The current practice is to reset process parameters in a certain period, or to reset machines and process equipment to new parameters periodically. In this way, although the difference in characteristics of the factory touch panel can be maintained within a certain level, adjusting parameters and resetting equipment from time to time will not only cause difficulty in quality control, but also increase the cost of manpower and hours. There are still certain characteristic differences between the factory-built touch panels, and the panels also have low adaptability to different operating environments.

Therefore, there is still a need to overcome the inaccuracy of the touch signal so that the touch signal output of the touch panel can achieve quality consistency.

In view of this, the signal processing method of the touch signal and the signal processing system applying the same of the present invention use virtual touch elements to connect to the touch points of the touch panel to obtain the response signals of the touch points, and then use the response signals The touch output signal to compensate for the touch point can improve the deviation of the touch signal, improve the accuracy of the touch panel to detect the touch signal, and thereby improve the quality of the touch product.

According to one aspect of the present invention, a signal processing method for touch signals is provided. First, a touch panel and a detection circuit are provided. The touch panel includes at least one touch point for production A touch signal is generated, and the detection circuit includes a virtual touch element. When the detection circuit is connected to the touch point in a way that does not pass through the virtual touch element, a reference signal is obtained by the detection circuit. When the detection circuit is connected to the touch point through the virtual touch element, a response signal is obtained from the detection circuit. Then, a response interval is calculated based on the response signal and the reference signal.

According to another aspect of the present invention, a signal processing system is provided for processing a touch signal. The signal processing system includes a touch panel and a detection device. The touch panel includes at least one touch point for generating a touch signal. The detection device is used to detect the touch panel, and includes a virtual touch element, a detection circuit and a processing unit. The virtual touch element is used to selectively connect to the touch point. When the detection circuit is connected to the touch point through a virtual touch element, the detection circuit is used to obtain a response signal; when the detection circuit is connected to the touch point in a manner not through the virtual touch element, the detection circuit is used to Obtain a reference signal. The processing unit is connected to the detection circuit to obtain a reference signal and a response signal, and calculates a response interval based on the response signal and the reference signal.

According to another aspect of the present invention, a signal processing method for touch signals is provided. First, a touch panel and a detection circuit are provided. The touch panel includes a plurality of touch points for generating touch signals. The detection circuit includes a Virtual touch element. Set the detection circuit in multiple measurement modes in a control environment. When the detection circuit is connected to each touch point, the detection circuit sequentially obtains multiple response signals corresponding to each touch point in the measurement mode, and the signal of the virtual touch element at the ground voltage is set as a reference signal . Secondly, a data table is formed. The data table includes the response signal and an adjustable range of each response signal. Then in an operating environment, read a field measurement value, use the relationship between the field measurement value and the reference signal to select a selected mode from the measurement mode, and determine from the data table the response signal of the selected mode. Adjustment range.

According to another aspect of the present invention, a signal processing system is provided for processing a touch signal. The signal processing system includes a touch panel and a detection device. The touch panel includes a plurality of touch points, and the touch points are used to generate touch signals. The detection device is used to detect the touch panel, and includes a virtual touch element, a detection circuit and a processing unit. The signal of the virtual touch element at the ground voltage is set as a reference signal. The detection circuit is used to sequentially set in a plurality of measurement modes in a control environment. When the detection circuit is connected to the touch points, the detection circuit is used to sequentially obtain multiple response signals corresponding to the measurement mode of each touch point. The processing unit is connected to the detection circuit for forming a data table according to the response signal. The processing unit is used to read a field measurement value in an operating environment, use the relationship between the field measurement value and the reference signal to select a selected mode from the measurement mode, and determine the number of corresponding selected modes from the data table Multiple adjustable ranges for each response signal.

According to another aspect of the present invention, a signal processing method for touch signals is provided. First, a touch panel and a detection circuit are provided. The touch panel includes at least one touch point for generating a touch signal. The detection circuit includes a Virtual touch element. When the detection circuit is connected to the touch point in a way that does not pass through the virtual touch element, a reference signal is obtained by the detection circuit. When the detection circuit is connected to the touch point through the virtual touch element, a response signal is obtained from the detection circuit. Then, the touch signal is compensated according to the reference signal and the response signal.

According to another aspect of the present invention, a signal processing system is provided for processing a touch signal. The signal processing system includes a touch panel and a detection device. The touch panel includes at least one touch point for generating a touch signal. The detection device is used to detect the touch panel, and includes a virtual touch element, a detection circuit and a processing unit. The virtual touch element is used to selectively connect to the touch point. When the detection circuit is connected to the touch point through a virtual touch element When, the detection circuit is used to obtain a response signal. When connected to the touch point without passing through the virtual touch element, the detection circuit is used to obtain a reference signal. The processing unit is connected to the detection circuit to obtain the reference signal and the response signal, and compensate the touch signal according to the response signal and the reference signal.

The signal processing method of the touch signal and the signal processing system applying the same of the present invention use the virtual touch element of the detection device to selectively connect to the touch point of the touch panel, thereby obtaining the response signal of the touch point, and This response signal compensates the touch output signal of the touch point. In this way, the deviation of the touch signal can be improved, the accuracy of detecting the touch signal can be improved, and the quality of the touch product can be improved.

100‧‧‧Signal Processing System

110‧‧‧Touch Panel

150‧‧‧Detection device

151‧‧‧Virtual touch element

153‧‧‧Detection circuit

155‧‧‧Processing unit

D1~Dn‧‧‧Drive line

S1~Sm‧‧‧Sensing line

S11~S15‧‧‧Step

S101~S105‧‧‧Step

S201~S209‧‧‧Step

S301~S311‧‧‧Step

T‧‧‧touch point

Vb‧‧‧reference signal

Vr‧‧‧Response signal

In order to make the above and other features, advantages and embodiments of the present invention more comprehensible, the description of the accompanying drawings is as follows: Figure 1 shows a flow chart of a signal processing method for touch signals according to an embodiment of the present invention Figure 2 shows a flowchart of a method for processing touch signals according to another embodiment of the present invention; Figure 3 shows a flowchart of a method for processing touch signals according to another embodiment of the present invention; Fig. 4 shows a detailed flowchart of step S205 in Fig. 3; Fig. 5 shows a schematic diagram of a signal processing system according to another embodiment of the present invention; Fig. 6 shows a virtual touch element connected to the touch in Fig. 5 A schematic diagram of controlling points; and FIG. 7 is a flowchart of a signal processing method of a touch signal according to another embodiment of the present invention.

The signal processing method of the touch signal and the signal processing system using the touch signal of the present invention use the way that the virtual touch element in the detection circuit is connected to the touch point of the touch panel to obtain the response signal of the touch point, and based on the response The signal further obtains the response interval. Various touch signal processing can be performed according to the response interval. For example, it is determined whether the touch point is bad, or the touch output signal of the touch point is compensated according to the response interval. In this way, whether it is due to process factors that cause the touch signal to shift, or the condition of the touch signal shift in different operating environments, it can be improved, thereby improving the accuracy of the touch panel in detecting touch signals , Improve product quality.

Please refer to FIG. 1, which shows a flowchart of a touch signal processing method according to an embodiment of the present invention. First, step S11 is performed to provide a touch panel and a detection circuit. The touch panel includes one or more touch points for generating touch signals. The detection circuit includes a virtual touch element. Then, step S13 is performed. When the detection circuit is connected to each touch point by a virtual touch element, the detection circuit sequentially obtains the response signal of each touch point. When the detection circuit is connected to the touch point in a way that does not pass through the virtual touch element, a reference signal is obtained by the detection circuit. Then in step S15, a response interval is calculated based on the response signal and the reference signal. According to the obtained response interval, different processing of various touch signals can be performed. For example, the response interval can be used to determine whether the touch point is bad, or the touch signal compensation can be performed according to the response interval.

In one embodiment, the touch panel includes a plurality of touch points, and the signal processing method of the touch signal may further include a step of determining a compensation coefficient. By comparing multiple reference signals of multiple touch points, multiple compensation coefficients of multiple touch points are determined, and the compensation coefficients are arranged in a matrix according to the relative position of each sensing point on the touch panel. In addition, in this embodiment, the system can optionally After the reference signal of each touch point is compensated, the response signal of each touch point is measured (step S13).

In another embodiment, multiple response signals of multiple touch points can be compared to determine multiple compensation coefficients of multiple touch points, and the compensation coefficients are determined according to the value of each sensing point on the touch panel. Relative position matrix arrangement.

Please refer to FIG. 2, which shows a flowchart of a signal processing method of touch signals according to another embodiment of the present invention. First, step S101 is performed to provide a touch panel and a detection circuit. The touch panel includes one or more touch points for generating touch signals. The detection circuit includes a virtual touch element. Next, step S103 is performed. When the detection circuit is connected to each touch point through a virtual touch element, the detection circuit sequentially obtains the response signal of each touch point. Then, the signal processing method of this embodiment executes step S105 to compensate the touch signal of the touch point based on the response signal. The touch signal processing method of this embodiment uses virtual touch elements to obtain the response signal of one or more touch points on the touch panel, and compensate the touch output signal of the touch point accordingly, without manual point by point Performing detection can improve efficiency and convenience, and at the same time, improve the touch accuracy of the touch panel by compensating the touch signal.

Please refer to FIG. 3, which shows a flowchart of a signal processing method for touch signals according to another embodiment of the present invention. First, as shown in step S201, a touch panel and a detection circuit are provided. The touch panel includes at least one touch point. In practical applications, a touch panel includes a plurality of touch points arranged in a matrix. The touch points are formed by interlacing multiple parallel driving lines and multiple parallel sensing lines to generate touch signals. The detection circuit includes a virtual touch element for selectively connecting to the touch point. In one embodiment, the virtual touch element is a touch circuit with adjustable capacitance.

Next, the signal processing method of the present embodiment executes step S203. When the detection circuit is connected to a touch point in a manner that does not use a virtual touch element, the detection circuit obtains a reference signal. In this step, the virtual touch element does not exist in the circuit connecting the detection circuit to the touch point. Therefore, the detection circuit can obtain that the touch point is not touched (here means that it is not connected to the virtual touch point). In the case of control components).

After obtaining the reference signal of multiple touch points, the difference between the reference signal (equivalent to the background sensing value of the touch point) when the touch point does not pass through the virtual touch element can be calculated, and a background compensation can be obtained The coefficient can be used to compensate the touch signal of the touch point. In addition, the reference signals of multiple touch points or multiple background compensation coefficients mentioned above can be arranged in a matrix according to their positions on the touch panel, or made into a table, which is convenient for subsequent acquisition, calculation and further application.

Secondly, the signal processing method of this embodiment enters step S205. When the detection circuit is connected to the touch point through a virtual touch element, the detection circuit obtains a response signal. The touch point here is the same as the touch point described in step S203. In this step, the virtual touch element exists in the circuit connecting the detection circuit to the touch point, so the detection circuit can obtain that the touch point is being touched (here refers to the case of connecting to the virtual touch element ) Response signal.

When the response signals of multiple touch points are obtained, the difference between the response signals (equivalent to the simulated touch value of the touch point) when the touch point passes through the virtual touch element can be calculated, and a simulated touch can be obtained The compensation coefficient can be used to compensate the touch signal of the touch point. In addition, the response signals of multiple touch points or multiple aforementioned analog touch compensation coefficients can be arranged in a matrix according to their positions on the touch panel, or can be made into a table for subsequent acquisition, calculation and further application.

Please refer to FIG. 4, which shows a detailed flowchart of step S205 in FIG. 3. In this embodiment, step S205 may include step S202 and step S204, for example. First, as shown in step S202, the virtual touch elements are sequentially set to different capacitance values; then in step S204, the detection circuit obtains the response signal corresponding to each capacitance value. In this way, the detection circuit can change the capacitance value of the virtual touch element to obtain the response signal of the touch point corresponding to different capacitance values. The capacitance value can be a positive value or a negative value to represent the response signal of the touch point in different states (for example, the presence of water, the presence of oil, the touch with the finger or the palm of the hand).

Please continue to refer to Figure 3. After obtaining the reference signal and response signal corresponding to the aforementioned touch point, the signal processing method of this embodiment can then perform actions to compensate for the touch signal, such as steps S207 and S209 of this embodiment Shown.

In step S207, a response interval corresponding to the touch point is calculated according to the response signal and the reference signal. Then in step S209, the touch signal is compensated according to the response interval. In practical applications, the response interval corresponds to the identification range of various substances on the signal caused by the touch panel. When there are multiple touch points, multiple response intervals can be calculated based on multiple response signals corresponding to multiple capacitance values of these touch points and multiple reference signals of these touch points.

In one embodiment, the response interval can be directly compared with a preset value to obtain the offset of the touch point touch signal, and then the touch point touch signal can be compensated accordingly. The foregoing preset value can be set according to the offset of the panel manufacturing process. For example, after a certain number of touch panels are manufactured, the offset of the touch signal caused by the manufacturing process difference is X, and X can be used as the foregoing preset value. In different embodiments, after obtaining the response signals of all touch points of the touch panel, the average value or standard deviation of all the response signals can be used as the preset value as the calculation basis for compensating the touch signal.

The signal processing method of this embodiment further includes step S206, when the response signal is not related to the change of the capacitance value, the touch point is set as bad. When virtual touch elements with different capacitance values are used to detect touch points and it is found that the signal changes of the touch points are not related to the virtual touch elements, it means that the response signals measured by the virtual touch elements cannot be used to compensate and correct the touch points. Control point. Therefore, the touch point is set as a bad touch point.

In addition, the signal processing method of this embodiment further includes step S208. When the response interval exceeds a compensation range, the touch point is set as bad. In this step, the compensation range can also be set by the offset of the touch signal due to process differences, or after obtaining the response signals of all touch points of the touch panel, the average value or standard deviation of all the response signals can be used to set . When the response interval of a touch point exceeds the compensation range, it means that the touch signal variation of the touch point is too large, and it is set as a bad touch point.

The signal processing method of the touch signal in the foregoing embodiment is described by taking the detection of a reference signal and a response signal of a touch point as an example. In one embodiment, the signal processing method can be used to detect the reference signal and response signal of all touch points on the touch panel. The virtual touch element can be connected to each touch point in sequence to obtain the reference signal and response signal of all touch points, and then know the reference signal distribution of the entire touch panel, and use it as a compensation touch signal. Calculation basis. According to the response signals of all touch points, the average value or standard deviation of all the response signals is used as the default value, which is the calculation basis for compensating the touch signal.

Please refer to FIG. 5, which shows a schematic diagram of a signal processing system according to another embodiment of the present invention. The signal processing system 100 of this embodiment can, for example, apply the signal processing method of the touch signal of the aforementioned embodiment to compensate the touch signal. The signal processing system 100 is used for processing a touch signal, and includes a touch panel 110 and a detection device 150. Touch panel 110 includes at least one touch point T for generating a touch signal. In practical applications, the touch panel 110 includes a plurality of touch points T arranged in a matrix. The touch points T are formed by interlacing a plurality of parallel driving lines D1~Dn and a plurality of parallel sensing lines S1~Sm. Formed to generate touch signals.

The detection device 150 is used to detect the touch panel 110 and includes a virtual touch element 151, a detection circuit 153 and a processing unit 155. The virtual touch element 151 is used to selectively connect to the touch point T. In this embodiment, driving the first driving line D1 and sensing through the first sensing line S1 to obtain a touch signal of a touch point T is taken as an example for description. In one embodiment, the virtual touch element 151 is a touch circuit with adjustable capacitance. When the detection circuit 153 is connected to the touch point T without passing through the virtual touch element 151, the detection circuit 153 is used to obtain a reference signal Vb.

Please refer to FIG. 5 and FIG. 6 at the same time. FIG. 6 shows a schematic diagram of the virtual touch element 151 connected to the touch point T in FIG. 5. When the detection circuit 153 is connected to the touch point T through the virtual touch element 151, the detection circuit 153 is used to obtain a response signal Vr.

The processing unit 155 is connected to the detection circuit 153 for obtaining the reference signal Vb and the response signal Vr, and calculates a response interval according to the response signal Vr and the reference signal Vb. The processing unit 155 is used for compensating the touch signal of the touch point T according to the response interval obtained by the aforementioned calculation. In one embodiment, the reaction interval can be compared with a preset value. The preset value can be set according to the offset of the panel manufacturing process. In different embodiments, after obtaining the response signals Vr of all touch points T of the touch panel 110, the average value or standard deviation thereof can be used as a calculation basis for compensating the touch signal.

In practical applications, the signal processing system 100 is not limited to obtaining a single touch point T. The virtual touch element 151 can be connected to all the touch points T of the touch panel 110 in sequence, so that The detection circuit can sequentially obtain the reference signal Vb and the response signal Vr of all touch points T. The virtual touch element 151 can be a touch circuit with adjustable capacitance. Therefore, the virtual touch element 151 can be set to different capacitance values sequentially, so that the detection circuit 153 can obtain the response signal Vr corresponding to each capacitance value.

In this embodiment, the processing unit 155 of the detection device 150 can set the touch point T to be bad when the response interval exceeds a compensable range. The processing unit 155 of the detection device 150 can further set the aforementioned one or more touch points T to be bad when the response signal Vr of the one or more touch points T is not related to the change of the capacitance value of the virtual touch element 151.

Please refer to FIG. 7, which shows a flow chart of a signal processing method for touch signals according to another embodiment of the present invention. First, as shown in step S301, a touch panel and a detection circuit are provided. The touch panel includes a plurality of touch points for generating touch signals. The detection circuit includes a virtual touch element.

In step S303, in a control environment, the detection circuit is set in a plurality of different measurement modes.

Secondly, as shown in step S305, when the detection circuit is connected to each touch point, the detection circuit sequentially obtains multiple response signals when each touch point corresponds to the multiple measurement modes. In this embodiment, the aforementioned multiple measurement modes are, for example, performing touch signal measurement at a touch point under multiple different measurement frequencies. For example, in the measurement frequency range of 10k to 1000k, the measurement is performed at every other fixed frequency, so as to obtain the response signal corresponding to the touch point at each measurement frequency. For example, with a fixed frequency of 50K, a measurement in the measurement mode is completed at a frequency of 50K, 100K, 150K... etc. In addition, when the virtual touch element is connected to each touch point, the detection circuit can set a signal when the virtual touch element is at the ground voltage. Reference signal.

Then, as shown in step S307, a data table is formed, and the data table includes the aforementioned multiple response signals. In other words, the data table stores the response signals obtained by each touch point in each measurement mode. In addition, the data table also includes an adjustable range for each response signal, such as +2 or -2.

Next, as shown in step S309, in an operating environment, read a field measurement value, use the relationship between the field measurement value and the reference signal, select a selected mode from the foregoing multiple measurement modes, and select a selected mode from the data table Determines the adjustable range of multiple response signals corresponding to the selected mode. In this embodiment, the difference between the control environment and the operation environment is that one of the control environments has a higher cleanliness than the operation environment.

There are multiple selection methods that can be applied to the selected mode. In this embodiment, the measurement mode is, for example, measuring touch signals at different measurement frequencies. Therefore, a frequency hopping measurement method can be applied to the selected mode, and it is determined that the measurement mode is less immune to noise interference. , As the selected mode. Then select the response signal of each touch point corresponding to the selected mode from the data table.

Then, as shown in step S311, the touch signal is compensated based on the response signal. In one embodiment, all touch points can be used as a basis for compensation of touch signals. However, the technology of the present embodiment is not limited to this. The signal processing method can also selectively compensate for touch signals based on a part of touch points, which can save time and improve the efficiency of compensation for touch signals.

The signal processing method of this embodiment further optionally includes step S302, step S304, and step S306. Step S302 is executed after step S301, for example, and step S304 and step S06 are executed after step S309, for example.

In step S302, a preset value of a touch signal corresponding to each touch point is set. Known process difference parameters or other known measurement methods can be used to measure and obtain characteristic values related to touch points in a controlled environment. The data sheet also contains the pre-stored value of this touch signal. In step S304, a part of the touch points are selected as multiple reference points. In step S306, when the difference between each response signal of each reference point (because the reference point is a touch point, the response signal corresponding to the reference point will be included in the data table) and the preset value of each touch signal is less than a threshold value To obtain a calibration interval. In step S311, based on the response signal, the touch signal is compensated according to the correction interval.

The reference point is the point where the signal in the touch panel is stable or the point is not easily affected by environmental factors. In one embodiment, step S304 uses a vector inner product similarity judgment method to define the reference point. The field measurement value of a certain touch point has a first vector value relative to a preset vector reference point in each measurement mode, and the touch signal preset value of the touch point has a value relative to the preset vector reference point. The second vector value. The preset vector reference point can be set according to the actual manufacturing process or product requirements, and it can be set based on the measurement in the control environment to obtain the characteristic value related to the touch point. According to the inner product cosine value of the first vector value and the second vector value, the difference between the response signal and the preset value of the touch signal is determined. The closer the cosine value is to 1, the closer the two are, and the more suitable the touch point is to be used as a reference point. According to this, correspondingly select the one with the smallest distance as the selected measurement mode for actual measurement.

The signal processing method of the touch signal of this embodiment can be applied to a signal processing system. The signal processing system is used for processing a touch signal, and includes a touch panel and a detection device. The touch panel includes a plurality of touch points for generating touch signals. The detection device is used to detect the touch panel, and includes a virtual touch element, a detection circuit and a processing unit. The virtual touch element is used to selectively connect to the touch point.

The difference from the aforementioned signal processing system 100 according to Figs. 5 and 6 is that In the signal processing system of this embodiment, the detection circuit is used to sequentially set a plurality of different measurement modes in a control environment. When the detection circuit is connected to each touch point, the detection circuit sequentially obtains multiple response signals corresponding to each touch point in the measurement mode. In this embodiment, the processing unit stores a data table containing the response signal. The processing unit is used to read a field measurement value in an operating environment, and use the relationship between the field measurement value and the reference signal to select a selected mode from the measurement modes, and determine the corresponding selected mode from the data table The adjustable range of the response signal, and the touch signal is compensated based on the response signal.

According to the signal processing method of the touch signal and the signal processing system applying the same according to the foregoing embodiment of the present invention, the virtual touch element is connected to the touch point to obtain the response signal, and the response signal is used as the calculation basis to compensate the touch Point of touch output signal. In this way, whether it is due to process factors that cause the touch signal to shift, or the situation that causes the touch signal to shift in different operating environments, it can be compensated. This system can improve the accuracy of the touch panel to detect touch signals, and at the same time improve product quality.

Although the present invention has been disclosed as above in multiple embodiments, they are not intended to limit the present invention. Anyone who is familiar with this technique can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope of the attached patent application.

S101~S105‧‧‧Step

Claims (12)

A signal processing method for touch signals includes: providing a touch panel and a detection circuit, the touch panel includes at least one touch point for generating the touch signal, and the detection circuit includes a virtual touch element; When the detection circuit is connected to the touch point without passing through the virtual touch element, the detection circuit obtains a reference signal; when the detection circuit is connected to the touch point through the virtual touch element At this time, the detection circuit obtains a reaction signal; and calculates a reaction interval based on the reaction signal and the reference signal. For example, the signal processing method described in item 1 of the scope of patent application further includes: when the response interval exceeds a compensation range, setting the touch point as bad. For example, in the signal processing method described in claim 1, wherein the step of obtaining the response signal from the detection circuit includes: sequentially setting the virtual touch element to different capacitance values; and separately by the detection circuit Obtain the response signal corresponding to each capacitance value. For example, the signal processing method described in item 3 of the scope of the patent application further includes: calculating a plurality of the response intervals according to the response signals corresponding to the capacitance values and the reference signal. For example, the signal processing method described in item 3 of the scope of the patent application further includes: when the response signal is not related to the change of the capacitance values, setting the touch point as bad. For the signal processing method described in item 3 of the patent application, the touch panel includes a plurality of the touch points, the virtual touch element is sequentially connected to each of the touch points, and the method further includes: The response signals of the capacitance values of the touch points and the reference signals of the touch points are calculated to obtain a plurality of the response intervals. A signal processing system for processing a touch signal, comprising: a touch panel including at least one touch point for generating the touch signal; and a detection device for detecting the touch panel, the detection The device includes: a virtual touch element for selectively connecting to the touch point; a detection circuit, when connected to the touch point through the virtual touch element, the detection circuit is used to obtain a When the response signal is connected to the touch point without passing through the virtual touch element, the detection circuit is used to obtain a reference signal; and a processing unit is connected to the detection circuit to obtain the reference signal and The reaction signal is calculated to obtain a reaction interval according to the reaction signal and the reference signal. Such as the signal processing system described in item 7 of the scope of patent application, wherein the processing unit is further used for When the response interval exceeds a compensation range, the touch point is set as bad. For example, in the signal processing system described in item 7 of the scope of patent application, the virtual touch elements are respectively set to different capacitance values in sequence, and the detection circuit is used to obtain the response signal corresponding to each capacitance value. For example, in the signal processing system described in item 9 of the scope of patent application, the processing unit is further used to calculate and obtain a plurality of the response intervals according to the response signals corresponding to the capacitance values. For example, in the signal processing system described in item 9 of the scope of patent application, the processing unit is further used to set the touch point as bad when the response signal is not related to the change of the capacitance values. For the signal processing system described in claim 7, wherein the touch panel includes a plurality of the touch points, and the virtual touch element is used to sequentially connect to each of the touch points.

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