TW202311924A - Touch screen interference detection method, touch control chip, and electronic device - Google Patents

Abstract

The present application provides a touch screen interference detection method, the method includes: scanning at least one node on the touch screen to generate a touch signal corresponding to each node; converting the touch signal corresponding to each node corresponding to a saturation signal; detecting the saturation signal, and determining whether the touch screen is interfered with based on the number of times the saturation signal is detected within a predetermined time. This application also provides a touch control chip and electronic devices. Thus, the touch screen interference detection method, touch control chip, and electronic device provided by this application can determine whether the touch screen is interfered with, the type of interference, and the area affected by the interference.

Description

Touch screen interference detection method, touch chip and electronic equipment

The present application relates to the field of touch technology, and in particular to a touch screen interference detection method, a touch chip and electronic equipment.

With the development of electronic technology, touch screens have been more widely used. The touch screen can sense the user's touch action to generate a touch signal to feedback the user's touch position. However, when the touch screen is disturbed, the touch signal will be saturated and distorted, affecting the accuracy of the touch position. In the prior art, by judging whether the magnitude of the touch signal exceeds a threshold, it can be judged whether the touch screen is disturbed. However, the interference of the touch screen includes power supply common mode interference and display interference. The inventor found in the course of work that, due to the difference in the interference principle of these two types of noise interference, the characteristics of the data are different. If any interference affects the touch signal, it is necessary to accurately identify and distinguish them. However, conventional technologies cannot distinguish the types of interference.

In view of the above problems, the present application provides a touch screen interference detection method, a touch chip and an electronic device, which can detect whether the touch screen is interfered and the type of interference.

In the first aspect, the present application provides a touch screen interference detection method, including: scanning at least one row or column of nodes on the touch screen to generate a touch signal corresponding to each node; correspondingly converting the touch signal corresponding to each node into a saturation signal; detecting saturation signal, and judge whether the touch screen is disturbed according to the detection times of the saturated signal within the preset time.

In some possible implementations, if the detection times of the saturated signal within the preset time is less than the first threshold, it is determined that the node corresponding to the saturated signal is not disturbed.

In some possible implementations, the detection times of saturation signals corresponding to all nodes in the first direction of the touch screen within a preset time are greater than the first threshold and less than the second threshold, and it is determined that all nodes in the first direction of the touch screen are affected The first disturbance, the first disturbance is display disturbance.

In some possible implementations, the user's touch area is determined according to the touch signal; the detection times of the saturation signals corresponding to the nodes in the touch area are greater than the second threshold within a preset time, and the saturation signals corresponding to the nodes in the non-touch area If the detection times of the signal within the preset time are less than the second threshold, it is determined that all the nodes in the touch area are subject to the second interference, and the second interference is power common mode interference.

In some possible implementation manners, the touch screen is a self-capacitive touch panel, and touch electrodes are arranged on the touch panel, and each touch electrode constitutes a node.

In some possible implementations, the touch screen is a mutual capacitive touch panel or a self-integrated touch panel. Insulated and intersecting touch electrodes are arranged in the first direction and the second direction of the touch panel, and the insulated intersections of the touch electrodes form a node.

In some possible implementations, the saturation signals of all nodes in the touch panel are detected, and it is determined whether the touch screen is disturbed according to the detection times of the saturation signals within a preset time.

In some possible implementations, the touch screen counts the detection times of saturation signals corresponding to nodes in the first direction within a preset time, specifically referring to the sum of detection times of saturation signals corresponding to all nodes in the second direction within a preset time or average.

In some possible implementations, the touch screen is a self-capacitive touch panel or a self-integrated touch panel. The touch screen detects any combination of a random row of nodes, a column of nodes, or a combination of a row and a column of nodes, and according to the saturation signal of the node The number of detections within the preset time determines whether the touch screen is disturbed.

In a second aspect, the present application provides a touch control chip, including a scanning unit for scanning at least one row or a column of nodes on the touch screen to generate a touch signal corresponding to each node; a conversion unit electrically connected to the scanning unit, and the conversion unit is used for The touch signal corresponding to each node is correspondingly converted into a saturation signal; the analysis unit is electrically connected to the conversion unit, and the analysis unit is used to detect the saturation signal, and judge whether the touch screen is disturbed according to the detection times of the saturation signal within a preset time.

In some possible implementation manners, if the analysis unit detects that the number of detections of the saturation signal within a preset time is less than a first threshold, the analysis unit determines that the node corresponding to the saturation signal is not disturbed.

In some possible implementations, if the analysis unit detects that the detection times of the saturation signals corresponding to all nodes in the first direction of the touch screen within a preset time are greater than the first threshold and less than the second threshold, the analysis unit determines that the first direction All nodes in the upward direction are subjected to the first interference, and the first interference is display interference.

In some possible implementations, the touch chip further includes a computing unit, electrically connected to the scanning unit, and the computing unit is used to determine the touch area of the user according to the touch signal; if the analysis unit detects that the saturation signal corresponding to the node in the touch area is The detection times within the preset time are greater than the second threshold, and the detection times of the saturation signals corresponding to the nodes in the non-touch area are less than the second threshold within the preset time, the analysis unit determines that all nodes in the touch area are subject to the second interference , the second interference is power supply common mode interference.

In some possible implementations, the touch chip further includes an amplifying unit, electrically connected to the scanning unit, and the amplifying unit is used to receive the touch signal and convert the touch signal into a voltage signal; a filtering unit, electrically connected to the amplifying unit, and the filtering unit It is used to filter the voltage signal; the analog-to-digital conversion unit is electrically connected to the filter unit, and the analog-to-digital conversion unit is used to convert the filtered voltage signal into a saturated signal.

In a third aspect, the present application provides an electronic device, which includes the above-mentioned touch chip.

Therefore, the touch screen interference detection method, touch chip, and electronic device provided by the present application can determine the user's touch position through the touch signal output by the node on the touch panel, and whether the touch panel is interfered, the type of interference, and the area affected by the interference, thereby Can accurately and quickly analyze the cause of interference and reduce interference.

In the embodiment of the present application, terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. For example, the first application, the second application, etc. are used to distinguish different applications, rather than to describe a specific order of applications, and the features defined as "first" and "second" may explicitly or implicitly include one or More of this feature.

Please refer to FIG. 1 , the present application provides a touch screen interference detection system 10 for detecting whether the touch screen is interfered, the type and intensity of the interference. The touch screen interference detection system 10 includes a touch panel 11 and a control unit 12 .

The control unit 12 includes a scanning unit 121, a calculation unit 122, a conversion unit 123, and an analysis unit 124. The scanning unit 121 includes m scanning lines T _x1 -T _xm , and the m scanning lines T _x1 -T _xm extend to the touch panel 11, And the m scan lines T _x1 -T _xm are electrically connected to the touch electrodes on the touch panel 11 . In some implementations, the m scan lines T _x1 -T _xm are used to provide an excitation signal (for example, a square wave signal or a sine wave oscillation signal) to the touch panel 11. The touch panel 11 includes at least one touch electrode. When the user touches When the touch screen is touched, the capacitance value of the touch electrode in the touch area changes, and the touch electrode outputs a corresponding touch signal to the calculation unit 122, and the calculation unit 122 can determine the user's touch area according to the touch signal, and output the area signal to the analysis unit 124.

The conversion unit 123 is electrically connected to the touch panel 11 and the analysis unit 124 , and the conversion unit 123 is used for receiving the touch signal output by the touch panel 11 and converting the touch signal into a saturation signal.

The analysis unit 124 is used for receiving the saturation signal and the area signal, and judging whether the touch screen is disturbed according to the saturation signal, and if the touch screen is disturbed, judging the interference type and the interference area.

It can be understood that if the touch screen is disturbed, the amplitude of the touch signal will exceed the preset threshold, and the saturation signal can indicate whether the amplitude of the touch signal exceeds the preset threshold, so that the analysis unit 124 can determine whether the touch screen is disturbed according to the saturation signal.

Please refer to FIG. 2 , in some embodiments, the touch panel 11 is a self-capacitive touch panel, the touch panel 11 includes a plurality of touch electrodes, and each capacitive coupling is named as a node, and the control unit 12 can sense the capacitive coupling The change of the capacitance value judges the touch action on the touch panel.

In FIG. 2, there are N touch electrodes in the row direction and M electrodes in the column direction, so there will be M*N nodes.

At T _x1 time, scan all channels of S _x1 -S _xn in the first row, at T _x2 time, scan all channels of S _x1 -S _xn in the second row, and so on until T _xm time, that is, complete the scanning of the entire touch panel, Generate M*N saturation detection data.

Taking the node 110 as an example, one end of the touch electrode in the node 110 is grounded, and the other end of the touch electrode in the node 110 is electrically connected to the scan line T _xi , where 1≦i≦m. When the user touches the touch screen, the capacitance value of the touch electrode in the node changes to the ground, and the node outputs touch signals through the sensing channel S _x1 -S _xn . It can be understood that the touch signal is related to the capacitance value of the touch electrode in the node. If the control The unit 12 determines the change of the capacitance value of the touch electrode in the node, so that the user's touch position can be determined according to the change of the touch signal.

The type of interference encountered by the touch screen during use includes at least one of first interference and second interference, and the first interference is display interference. It can be understood that when the touch device includes a display component, the touch panel 11 is disposed adjacent to the display component, and the display component is used to display content to the user. Display interference is the interference caused by different content displayed by the display components at different times, and the magnitude of the display interference will change with the change of the display content.

The second interference is power supply common mode interference. For example, the common mode interference of the power supply is the interference caused by the voltage fluctuation and the interference signal of the power grid when the charging and discharging device (for example, a charger) is connected to the touch panel 11. When the panel 11 is touched, the touch area will be affected, or the common mode interference of the power supply may affect all nodes in the second direction (for example, the column direction).

Please refer to FIG. 3A and FIG. 3B , in this embodiment, the touch panel 11 is a mutual capacitance touch panel, and the scanning unit 121 includes m scanning lines T _x1 -T _xm and n receiving lines R _x1 -R _xn , the scanning lines and The receiving lines respectively extend on the touch panel 11 , and the m scanning lines T _x1 -T _xm and the n receiving lines R _x1 -R _xn perpendicularly intersect with each other, and the intersections of the scanning lines and the receiving lines are insulated. A node is generated at the intersection of each receive line and each scan line.

Taking the node 110 as an example, the node 110 is generated at the intersection of the receiving line R _x1 and the scanning line T _x1 . In FIG. 3A , the N receiving lines Rx and the M scanning lines Tx generate M*N nodes in total. In FIG. 3B , 4 receiving lines Rx and 4 scanning lines Tx generate a total of 16 nodes in 4*4.

When the user touches the touch screen, the capacitance value of the touch electrode in the node changes, and the node outputs a touch signal to the control unit 12 through the receiving line Rxj. It can be understood that the touch signal is related to the capacitance value of the touch electrode at the node. If the control unit 12. By determining the change of the touch signal, the change of the capacitance value of the touch electrode at the node can be determined, thereby determining the user's touch area.

Please refer to FIG. 4 , in some implementations, the conversion unit 123 includes an amplification unit 1231, a filter unit 1232 and an analog-to-digital conversion unit 1233, the amplification unit 1231 is electrically connected to the node and the filter unit 1232, and the filter unit 1232 is electrically connected to the analog-to-digital conversion The unit 1233 and the analog-to-digital conversion unit 1233 are electrically connected to the analysis unit 124 .

In this embodiment, the amplifying unit 1231 is used to receive the touch signal and convert the touch signal into a voltage signal. Specifically, the amplifier 123a may include a charge amplifier, and the charge amplifier may convert the touch signal of the charge variation of the touch electrode on the node into voltage signal. In other implementation manners, the amplifying unit 1231 is used to receive the touch signal and convert the touch signal into a current signal.

The filtering unit 1232 is used for filtering the voltage signal. It can be understood that filtering the voltage signal can filter out noise components in the voltage signal. In some implementations, the filtering unit 1232 includes an adaptive notch filter (Adaptive Notch Filter, ANF).

The analog-to-digital conversion unit 1233 is used to convert the filtered analog signal into a digital signal. It can be understood that the analysis unit 124 can determine whether the amplitude of the digital signal exceeds a preset threshold, and a digital signal exceeding the preset threshold is defined as a saturated signal. The analysis unit 124 can calculate the times of detecting the saturation signal within a preset time, and judge whether the touch screen is disturbed according to the detection times of the saturation signal, and judge the type of the disturbance according to the corresponding touch signal.

In some embodiments, the touch panel 11 is a self-capacitive touch panel. After the scanning line _Tx1 - _Txm on the self-capacitive touch panel provides an excitation signal, the sensing of the touch panel 11 within the time period of _Tx1 - _Txm Channels S _x1 -S _xn output corresponding touch signals. Here, each time period of T _x1 -T _xm is the time period from the waveform sending to the end of the corresponding excitation signal.

The analysis unit 124 counts the times of detecting the saturation signal corresponding to each node within the preset time as shown in Table 1: Table 1 S _x1 S _x2 S _x3 S _x4 S _x5 S _x6 S _x7 … S _{x ( n-1 )} S _x T _x1 122 116 120 121 119 119 117 … 120 118 T _x2 60 63 63 62 61 62 60 … 63 59 T _x3 350 352 348 349 350 350 351 … 353 348 T _x4 266 264 268 268 267 265 266 … 267 267 … … … … … … … … … … … T _{x ( m-1 )} 4 0 1 0 0 0 2 … 2 0 T _x 352 349 3352 352 349 350 353 … 350 349

Wherein, the number of saturation signals is the total number of times of triggering interference of the nodes on the corresponding sensing channel S _x1 -S _xn in each time period of T _x1 -T _xm .

It can be understood that when the user does not touch the touch panel 11 , there are m*n saturation detection data in Table 1 . In the first direction (that is, the sensing channel _Sx1 - _Sxn direction, in this embodiment, the row direction), the detection times of the saturation signals corresponding to each node are greater than the first threshold (for example, the first threshold) within the preset time can be 100), and are all smaller than the second threshold (for example, the second threshold can be 130), that is, the detection times of saturation signals corresponding to each node in the first direction in Table 1 are similar within the preset time, and the analysis unit 124 It can be determined that touch panel 11 has received display disturbance.

It should be noted that for different scanning time periods, the first threshold and the second threshold may be different. For example, in the _Tx1 time period, the first threshold can be set to 100, and the second threshold can be set to 130; while in the _Tx2 time period, the first threshold can be set to 55, and the second threshold can be set to 65. If the detection times of the saturation signals corresponding to all nodes in the same scanning time period are between the corresponding first threshold and the second threshold within the preset time period, the analysis unit 124 can determine that the touch panel 11 is disturbed by the display.

In other embodiments, if the user touches the touch panel 11, and the calculation unit 122 determines that the user's touch area is the area enclosed by the sensing channels _Sx3 - _Sx4 and the scanning lines _Tx2 - _Tx3 according to the touch signal, the analysis unit 124 counts the detection times of the saturation signal corresponding to each node within the preset time as shown in Table 2: Table 2 S _x1 S _x2 S _x3 S _x4 S _x5 S _x6 S _x7 … S _{x ( n-1 )} S _x T _x1 0 0 0 0 0 0 0 … 0 0 T _x2 0 0 100 45 0 0 0 … 0 0 T _x3 0 0 90 76 0 0 0 … 0 0 T _x4 0 0 0 0 0 0 0 … 0 0 … … … … … … … … … … … T _{x ( m-1 )} 0 0 0 0 0 0 0 … 0 0 T _x 0 0 0 0 0 0 0 … 0 0

It can be understood that the number of detections of saturation signals of nodes in the user's touch area within the preset time is not zero, while the number of detections of saturation signals of nodes in other areas is zero within the preset time, but the units in the touch area The second direction in Table 2 (that is, the direction of the scanning channel _Tx1 - _Txm , which is the row direction in this embodiment), that is, the detection of the saturated signals corresponding to the adjacent nodes on the two rows of _Sx3 and _Sx4 within the preset time If the number of times is significantly greater than that of other areas, the analyzing unit 124 can determine that the touch panel 11 is subjected to power supply common mode interference.

In this embodiment, the data in the _Sx3 column is relatively larger than the data in the _Sx4 column. It can be understood that due to the impact of the finger contact area, the user's finger is relatively biased to the _Sx3 side.

It can be understood that when there are multiple touch areas, the common mode interference of the power supply will appear in the corresponding multiple touch areas.

In this embodiment, if the analysis unit 124 counts the detection times of the saturation signal corresponding to each node within the preset time as shown in Table 3: Table 3 S _x1 S _x2 S _x3 S _x4 S _x5 S _x6 S _x7 … S _{x ( n-1 )} S _x T _x1 122 116 120 121 119 119 117 … 120 118 T _x2 60 63 163 110 61 62 60 … 63 59 T _x3 350 352 433 420 350 350 351 … 353 348 T _x4 266 264 268 268 267 265 266 … 267 267 … … … … … … … … … … … T _{x ( m-1 )} 4 0 1 0 0 0 2 … 2 0 T _x 352 349 352 352 349 350 353 … 350 349

If the user touches the touch panel 11, and the calculation unit 122 determines the user's touch area is the area enclosed by the sensing channels _Sx3 - _Sx4 and the scanning lines _Tx2 - _Tx3 according to the touch signal, there are four nodes in the touch area. For each node outside the touch area, the detection times of saturation signals corresponding to the nodes in the first direction (that is, the direction of the sensing channel S _x1 -S _xn ) in Table 3 are similar within the preset time. Please refer to T _x1 , T _x4 , T _{x ( m−1 )} , the value of the nodes in the T _xm direction, the analysis unit 124 can determine that the touch panel 11 has been disturbed by the display.

Furthermore, in the touch area, if the detection times of the saturation signals corresponding to the nodes in the first direction are greater than the corresponding second threshold within the preset time, the analysis unit 124 can determine that the touch panel 11 is subjected to power common mode interference.

In this embodiment, if the analysis unit 124 counts the detection times of the saturation signal corresponding to each node within the preset time as shown in Table 4: Table 4 S _x1 S _x2 S _x3 S _x4 S _x5 S _x6 S _x7 … S _{x ( n-1 )} S _x T _x1 0 0 0 0 0 0 0 … 0 0 T _x2 0 0 0 0 0 0 0 … 0 0 T _x3 0 0 0 0 0 0 0 … 0 0 T _x4 0 0 0 0 0 0 0 … 0 0 … … … … … … … … … … … T _{x ( m-1 )} 0 0 0 0 0 0 0 … 0 0 T _x 0 0 0 0 0 0 0 … 0 0

It can be understood that the detection times of the saturation signals corresponding to all the nodes on the touch panel 11 in Table 4 within the preset time do not exceed the preset threshold, and the analysis unit 124 can determine that the touch panel 11 is not disturbed.

In some implementations, the touch panel 11 is a mutual capacitance touch panel or a self-mutual capacitance integrated touch panel. After the scanning lines T _x1 -T _xm on the mutual capacitive touch panel provide excitation signals, the receiving lines R _x1 -R _xn of the touch panel 11 output the corresponding touch signals, there are m*n nodes, and m*n saturation can be obtained Test data.

The analysis unit 124 counts the times of detecting the saturation signal corresponding to each node within the preset time as shown in Table 5: Table 5 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x T _x1 122 116 120 121 119 119 117 … 120 118 T _x2 60 63 63 62 61 62 60 … 63 59 T _x3 350 352 348 349 350 350 351 … 353 348 T _x4 266 264 268 268 267 265 266 … 267 267 … … … … … … … … … … … T _{x ( m-1 )} 4 0 1 0 0 0 2 … 2 0 T _x 352 349 3352 352 349 350 353 … 350 349

It can be understood that when the user does not touch the touch panel 11, the m*n saturation detection data in Table 5 of the analysis unit are in the first direction (that is, the direction of the receiving line _Rx1 - _Rxn , which is the row direction in this embodiment) The detection times of saturation signals corresponding to each node on the above are greater than the first threshold (for example, the first threshold can be 100) and less than the second threshold (for example, the second threshold can be 130) within the preset time, namely The detection times of saturation signals corresponding to each node in the first direction in Table 5 are similar within a predetermined time period, and the analysis unit 124 can determine that the touch panel 11 has been disturbed by the display.

It should be noted that for different scanning time periods, the first threshold and the second threshold may be different. For example, in the _Tx1 time period, the first threshold can be set to 100, and the second threshold can be set to 130; while in the _Tx2 time period, the first threshold can be set to 55, and the second threshold can be set to 65. If the detection times of the saturation signals corresponding to all nodes in the same scanning time period are between the corresponding first threshold and the second threshold within the preset time period, the analysis unit 124 can determine that the touch panel 11 is disturbed by the display.

In other embodiments, if the user touches the touch panel 11, and the calculation unit 122 determines that the user's touch area is the area enclosed by the receiving lines _Rx3 - _Rx4 and the scanning lines _Tx2 - _Tx3 according to the touch signal, the analysis unit 124 counts the detection times of the saturation signal corresponding to each node within the preset time as shown in Table 6: Table 6 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x T _x1 0 0 10 88 0 0 0 … 0 0 T _x2 0 0 100 45 0 0 0 … 0 0 T _x3 0 0 90 76 0 0 0 … 0 0 T _x4 0 0 44 36 0 0 0 … 0 0 … … … … … … … … … … … T _{x ( m-1 )} 0 0 96 75 0 0 0 … 0 0 T _x 0 0 28 39 0 0 0 … 0 0

It can be understood that the number of detection times of the saturation signal of the node in the user's touch area within the preset time is not zero. However, the second direction in Table 6 of the unit where the touch area is located (that is, the direction of the scanning channel _Tx1 - _Txm , which is the column direction in this embodiment), that is, the saturation signals corresponding to the left and right adjacent nodes on the two columns of _Rx3 and _Rx4 If the number of times of detection within the preset time is not zero, the analysis unit 124 can determine that the touch panel 11 is subjected to common-mode interference from the power supply.

Similarly, when there are multiple touch positions, the data of the columns involved in the touch area will have different levels of interference.

In this embodiment, if the analysis unit 124 counts the detection times of the saturation signal corresponding to each node within the preset time as shown in Table 7: Table 7 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x T _x1 122 116 130 208 119 119 117 … 120 118 T _x2 60 63 163 110 61 62 60 … 63 59 T _x3 350 352 433 420 350 350 351 … 353 348 T _x4 266 264 312 304 267 265 266 … 267 267 … … … … … … … … … … … T _{x ( m-1 )} 4 0 96 75 0 0 2 … 2 0 T _x 352 349 380 391 349 350 353 … 350 349

If the user touches the touch panel 11, and the calculation unit 122 determines the user's touch area is the area enclosed by the sensing channels _Sx3 - _Sx4 and the scanning lines _Tx2 - _Tx3 according to the touch signal, there are four nodes in the touch area. For each node outside the touch area, the detection times of saturation signals corresponding to nodes in the first direction (ie, the direction of the receiving line R _x1 -R _xn ) in Table 7 are similar within the preset time, and you can refer to T _x1 and T _x4 , Tx(m−1), _Txm direction node values, the analysis unit 124 can determine that the touch panel 11 has been disturbed by the display. Furthermore, in the touch area, if the detection times of the saturation signals corresponding to the nodes in the first direction are greater than the corresponding second threshold within the preset time, the analysis unit 124 can determine that the touch panel 11 is subjected to power common mode interference.

In this embodiment, if the analysis unit 124 counts the detection times of the saturation signal corresponding to each node within the preset time as shown in Table 8: Table 8 S _x1 S _x2 S _x3 S _x4 S _x5 S _x6 S _x7 … S _{x ( n-1 )} S _x T _x1 0 0 0 0 0 0 0 … 0 0 T _x2 0 0 0 0 0 0 0 … 0 0 T _x3 0 0 0 0 0 0 0 … 0 0 T _x4 0 0 0 0 0 0 0 … 0 0 … … … … … … … … … … … T _{x ( m-1 )} 0 0 0 0 0 0 0 … 0 0 T _x 0 0 0 0 0 0 0 … 0 0

It can be understood that the detection times of the saturation signals corresponding to all the nodes on the touch panel 11 in Table 8 within the preset time do not exceed the preset threshold, and the analysis unit 124 can determine that the touch panel 11 is not disturbed.

In other embodiments, the touch panel 11 includes a mutual-capacitance touch panel, or a self-mutual-capacitance integrated touch panel. After the scanning lines _Tx1 - _Txm provide excitation signals, the receiving lines _Rx1 - _Rxn output corresponding touch signals. , the conversion unit 123 converts the touch signal into a corresponding saturation signal. The analysis unit 124 can count the detection times of the saturation signal corresponding to the node on the first direction (ie, the direction of the receiving line _Rx1 - _Rxn ) within a preset time, wherein _Rxs refers to the second direction (ie, the direction of the scanning line Tx1- _Rxn ). The sum or average value of the detection times of saturation signals corresponding to all nodes on the T _{x n} direction within a preset time. For example, the data of the receiving line _Rx1 refers to the sum or average value of the detection times of the saturated signals corresponding to all the nodes in the row where the receiving line _Rx1 is located within a preset time.

In this embodiment, the noise distribution can be counted row by row, and the analysis is only performed on N saturated signal times, instead of counting the noise distribution of each node (that is, M*N nodes). Analysis unit 124 statistical data are as shown in table 9: Table 9 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 1154 1154 1152 1152 1146 1146 1149 … 1155 1141

It can be understood that when the user does not touch the touch panel 11, the detection times of the saturation signals corresponding to all the nodes in the first direction in Table 9 are similar within the preset time, and the analysis unit 124 can determine that the touch panel 11 has been displayed. interference.

In this embodiment, if the user touches the touch panel 11, and the analysis unit 124 determines that the user's touch area is located in the area enclosed by the receiving line _Rx3 - _Rx4 , the saturation signals corresponding to all the nodes that the analysis unit 124 counts are within the preset The detection times within the time are shown in Table 10: Table 10 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 0 0 312 209 0 0 0 … 0 0

It can be understood that the number of detections of saturation signals of two nodes in the user's touch area within a preset time is not zero, while the number of detections of saturation signals of nodes in other areas is zero within a preset time. That is, interference of different magnitudes exists on different columns of the user's touch area, and no interference is detected in the column direction of the non-touch area. Then the analysis unit 124 can determine that the touch panel 11 is subjected to common-mode interference from the power supply.

In this embodiment, if the analysis unit 124 counts the number of detections of the saturation signal corresponding to the node within the preset time as shown in Table 11: Table 11 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 1154 1144 1464 1361 1146 1146 1149 … 1155 1141

It can be understood that when the user touches the touch panel 11, in addition to the touch area, the detection of the saturation signal corresponding to the nodes in the first direction (that is, the direction of the receiving line _Rx1 - _Rxn ) in Table 11 within the preset time The number of times is similar, and in the touch area, the detection times of the saturation signals corresponding to the nodes in the first direction are greater than the corresponding second threshold within the preset time, then the analysis unit 124 can determine that the touch panel 11 has been disturbed by the display and Suffered from power supply common mode interference.

In this embodiment, if the analysis unit 124 counts the number of detections of the saturation signal corresponding to the node within the preset time as shown in Table 12: Table 12 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 0 0 0 0 0 0 0 … 0 0

It can be understood that the detection times of the saturation signals corresponding to all the nodes on the touch panel 11 in Table 12 within the preset time do not exceed the preset threshold, and the analyzing unit 124 can determine that the touch panel 11 is not disturbed.

In other embodiments, the touch panel 11 is a self-capacitive touch panel or a self-mutual capacitance integrated touch panel. After the scanning lines _Tx1 - _Txm provide excitation signals, the receiving lines _Rx1 - _Rxn output corresponding touch signals. The conversion unit 123 converts the touch signal into a corresponding saturation signal.

The self-mutual capacitance integrated touch panel adopts the method of detecting "M+N" nodes and distinguishing power supply common mode interference and display interference. The M data are the number of saturated signals corresponding to the nodes detected in the direction of the scan line T _x1 -T _xm in the same time period. The N data are the number of saturated signals corresponding to the nodes detected in the direction of the receiving line R _x1 -R _xn in the same time period. R _xs refers to the sum or average value of detection times of saturation signals corresponding to all nodes in the second direction (ie, the direction of the scan line T _x1 -T _xm ) within a preset time. For example, the data of the receiving line _Rx1 refers to the sum or average value of the detection times of the saturated signals corresponding to all the nodes in the row where the receiving line _Rx1 is located within a preset time. Similarly, T _xs refers to the sum or average of the detection times of saturation signals corresponding to all nodes in the first direction (ie, the direction of the receiving line R _x1 -R _xn ) within a preset time. For example, the data of the receiving line _Tx1 refers to the sum or average value of the detection times of the saturation signals corresponding to all nodes in the row where the receiving line _Tx1 is located within a preset time.

The analysis unit 124 can also count the detection times of the saturation signals corresponding to the nodes in the first direction and the second direction within a preset time, for example, as shown in Table 13: Table 13 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 1154 1144 1152 1152 1146 1146 1149 … 1155 1141 T _x1 2321 T _x2 2320 T _x3 2325 T _x4 2325 ... ... T _{x ( m-1 )} 2328 T _x 2323

It can be understood that when the user does not touch the touch panel 11, the saturation signals corresponding to the nodes in the first direction ( _Rxn direction, row direction) in Table 13 have similar detection times within the preset time, and the second direction The detection times of saturation signals corresponding to the nodes on (T _xm direction, row direction) are similar within a predetermined time period, and the analysis unit 124 can determine that the touch panel 11 is only affected by display interference.

In this embodiment, if the user touches the touch panel 11, and the analysis unit 124 determines that the user's touch area is the area enclosed by the receiving lines _Rx3 - _Rx4 and the scanning lines _Tx2 - _Tx3 , the analysis unit 124 counts the first The detection times of saturation signals corresponding to the nodes in the first direction and the second direction within the preset time are shown in Table 14: Table 14 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 0 0 312 209 0 0 0 … 0 0 T _x1 0 T _x2 145 T _x3 166 T _x4 0 ... ... T _{x ( m-1 )} 0 T _x 0

It can be understood that the number of detections of the saturation signal of the node in the user's touch area within the preset time is not zero, and the values are different, while the number of detections of the saturation signal of the node in other areas is zero within the preset time, then the analysis The unit 124 may determine that the touch panel 11 is subjected to power common mode interference.

In this embodiment, the user touches the touch panel 11, and the analysis unit 124 determines that the user's touch area is the enclosed area of the scanning lines _Tx2 - _Tx3 and the receiving lines _Rx3 - _Rx4 . If the analysis unit 124 respectively counts the detection times of the saturation signals corresponding to the nodes in the first direction and the second direction within the preset time, as shown in Table 15: Table 15 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 1154 1144 1464 1361 1146 1146 1149 … 1155 1141 T _x1 2321 T _x2 2465 T _x3 2481 T _x4 2325 ... ... T _{x ( m-1 )} 2328 T _x 2323

It can be understood that when the user touches the touch panel 11, outside the touch area, the saturation signal corresponding to the node on the first direction (ie, the direction of the receiving line _Rx1 - _Rxn ) in Table 15 is detected within the preset time The times are similar, and in the touch area, the detection times of the saturation signals corresponding to the nodes in the first direction are greater than the corresponding second threshold within the preset time. And outside the touch area, the saturation signal corresponding to the node on the second direction in Table 15 (that is, the scanning line T _x1 -T _xm direction) is similar to the number of detections within the preset time, while in the touch area, in the second direction If the detection times of the saturation signals corresponding to the nodes are greater than the corresponding second threshold within the preset time, the analysis unit 124 can determine that the touch panel 11 is subjected to both display interference and power supply common mode interference.

In this embodiment, if the analysis unit 124 respectively counts the detection times of the saturation signals corresponding to the nodes in the first direction and the second direction within the preset time, as shown in Table 16: Table 16 R _x1 R _x2 R _x3 R _x4 R _x5 R _x6 R _x7 … R _{x ( n-1 )} R _x 0 0 0 0 0 0 0 … 0 0 T _x1 0 T _x2 0 T _x3 0 T _x4 0 ... ... T _{x ( m-1 )} 0 T _x 0

It can be understood that the detection times of the saturation signals corresponding to all nodes on the touch panel 11 in Table 16 do not exceed the preset threshold within the preset time, and the analysis unit 124 can determine that the touch panel 11 is not disturbed.

For self-capacitance touch panels or self-mutual capacitance integrated touch panels, because only from the Tx direction or Rx direction can detect and distinguish power supply common-mode interference and display interference, and can also locate the generation of power supply common-mode interference and display interference Therefore, from the perspective of resource saving, only one of the above directions (such as: Tx direction or Rx direction) can be used to detect and distinguish power supply common mode interference and display interference.

In some embodiments, the analysis unit 124 can also count the detection times of the saturation signals corresponding to all nodes on the touch panel 11 within a preset time, so as to determine whether the touch panel 11 is interfered and the type of interference. The specific determination method is the same as in Table 1- It is described in Table 16 and will not be repeated here.

Therefore, the touch screen interference detection system 10 provided by the present application can determine the user's touch position, and whether the touch panel is interfered and the type of interference through the touch signals output by the nodes on the touch panel, so that the interference can be accurately and quickly reduced.

Please refer to FIG. 5 , the present application provides a touch screen interference detection method, which is applied to a touch screen device, and the method is used to detect whether the touch screen is interfered and the type of interference. The touch screen interference detection method includes the following steps:

Step S1: Scan at least one row or column of nodes on the touch screen to generate a touch signal corresponding to each node.

It can be understood that the m scanning lines _Tx1 - _Txm in the scanning unit 121 provide excitation signals (for example, square wave signals or sine wave oscillation signals) to the nodes on the touch panel 11, and the nodes pass through the sensing channels _Sx1 - _Sxn or receive The lines R _x1 -R _xn output touch signals to the calculation unit 122 and the conversion unit 123 .

Step S2: Determine the user's touch area according to the touch signal.

It can be understood that when the user touches the touch screen, the capacitance value of the touch electrode in the node changes, and the touch signal is associated with the capacitance value of the touch electrode in the node. If the calculation unit 122 determines that the touch signal changes, it can be determined The capacitance value of the control electrode changes to determine the user's touch area, and the signal representing the touch area is sent to the analysis unit 124 .

Step S3: Correspondingly converting the touch signal corresponding to each node into a saturation signal.

In some embodiments, converting the touch signal corresponding to each node into a saturation signal by the converting unit 123 may further include: the amplifying unit 124 receives the touch signal and converts the touch signal into a voltage signal; the filtering unit 125 filters the voltage signal ; The analog-to-digital conversion unit 1233 converts the filtered voltage signal into a saturated signal.

It can be understood that the saturation signal is used to indicate whether the magnitude of the touch signal exceeds a predetermined threshold. It can be understood that if the magnitude of the touch signal exceeds the predetermined threshold, the corresponding node may be disturbed.

Step S4: Detect the saturation signal, and determine whether the touch screen is disturbed according to the detection times of the saturation signal within a preset time.

It can be understood that referring to Table 1-Table 12, the analysis unit 124 can determine whether the touch panel 11 is interfered and the type of interference according to the detection times of the saturation signal corresponding to the node within a preset time.

Specifically, if the analysis unit 124 detects that the number of detections of the saturation signal within the preset time is less than the first threshold, the analysis unit 124 determines that the node corresponding to the saturation signal is not disturbed.

If within the preset time, the analysis unit 124 detects that the number of detections of the saturation signal within the preset time is greater than the first threshold and less than the second threshold, then the analysis unit 124 determines that all nodes in the first direction of the touch panel 11 are affected by the second threshold. a disturbance.

If within the preset time, the analysis unit 124 detects that the number of detection times of the saturation signal corresponding to the node in the touch area is greater than the second threshold within the preset time, and the saturation signal corresponding to the node in the non-touch area is within the preset time If the number of times of detection within is less than the second threshold, the analysis unit 124 determines that all nodes in the touch area are subject to the second interference.

Referring to FIG. 6 , the present application provides an electronic device 100 that includes the touch screen interference detection system 10 in the above-mentioned embodiment.

In some embodiments, electronic device 100 includes, but is not limited to, portable or mobile devices, cell phones, tablet computers, televisions, personal digital assistants, laptops, desktops, handheld PCs, servers, networking devices, graphics devices , video game devices, cellular phones, portable media players, handheld devices, wearable devices (e.g., display glasses or goggles, head-mounted displays, watches, headsets, etc.), virtual and/or augmented reality devices, Internet of things equipment, industrial control equipment, vehicle infotainment equipment, streaming media client equipment, e-book reading equipment, or other electronic equipment with a touch screen that can be touched.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the application, rather than to limit the application, as long as the above embodiments are within the spirit of the application, the appropriate Alterations and variations are within the scope of the claims of this application.

10: Touch screen interference detection system 11: Touch panel 100: Electronic equipment 110: Node 12: Control unit 121: Scanning unit 122: Computing unit 123: Converting unit 1231: Amplifying unit 1232: Filtering unit 1233: Analog-to-digital converting unit 124: Analysis Unit T _x1 -T _xm : scanning line R _x1 -R _xn : receiving line S _x1 -S _xn : sensing channel S1-S4: step

FIG. 1 is a structural diagram of a touch screen interference detection system provided by the present application. FIG. 2 is a schematic structural diagram of a self-capacitive touch panel. FIG. 3A is a schematic structural diagram of a mutual capacitance touch panel. FIG. 3B is a schematic diagram of another structure of a mutual capacitive touch panel. FIG. 4 is a structural diagram of the conversion unit in FIG. 1 . FIG. 5 is a flowchart of a touch screen interference detection method provided by the present application. FIG. 6 is a schematic diagram of an electronic device provided by the present application.

10: Touch screen interference detection system

11: Touch panel

12: Control unit

121: Scanning unit

122: Calculation unit

123: conversion unit

124: Analysis unit

T _x1 -T _xm : scan line

Claims (15)

A touch screen interference detection method, the improvement of which includes: scanning at least one row or column of nodes on the touch screen to generate a touch signal corresponding to each node; Convert the touch signal corresponding to each node into a saturated signal; Detecting the saturation signal, and judging whether the touch screen is disturbed according to the detection times of the saturation signal within a preset time. The touch screen interference detection method as described in claim 1, further comprising: If the detection times of the saturated signal within the preset time is less than a first threshold, it is determined that the node corresponding to the saturated signal is not disturbed. The touch screen interference detection method according to claim 1, wherein the method further includes: The detection times of the saturation signals corresponding to all nodes in the first direction of the touch screen within the preset time are greater than the first threshold and less than the second threshold, and it is determined that all nodes in the first direction of the touch screen are affected The first interference, the first interference is display interference. The touch screen interference detection method as described in claim 3, further comprising: determining the user's touch area according to the touch signal; The detection times of the saturation signals corresponding to the nodes in the touch area are greater than the second threshold within a predetermined time, and the detection times of the saturation signals corresponding to the nodes in the non-touch area are less than a predetermined time. If the second threshold is used, it is determined that all nodes in the touch area are subject to the second interference, and the second interference is power common mode interference. The touch screen interference detection method according to claim 4, wherein the touch screen is a self-capacitive touch panel, and touch electrodes are arranged on the touch panel, and each touch electrode constitutes a node. The touch screen interference detection method according to claim 4, wherein the touch screen is a mutual capacitive touch panel or a self-integrated touch panel, and the first direction and the second direction of the touch panel are provided with insulated and intersecting touch electrodes , the insulating intersections of the touch electrodes form a node. The touch screen interference detection method as described in claim 5 or 6, wherein the method further includes: detecting the saturation signals of all nodes in the touch panel, and detecting the saturation signals within a preset time according to the detection The number of times determines whether the touch screen is disturbed. The touch screen interference detection method as described in claim 6, wherein the touch screen counts the detection times of the saturation signals corresponding to the nodes in the first direction within a preset time, specifically refers to the saturation signals corresponding to all nodes in the second direction The sum or average of the detection times within the preset time. The touch screen interference detection method according to claim 5, wherein the touch screen is a self-capacitance touch panel or a self-integrated touch panel, and the touch screen detects any combination of a random row of nodes, a column of nodes, or a row plus a column of nodes One method is to determine whether the touch screen is disturbed according to the detection times of the saturation signal of the node within a preset time. A touch control chip, the improvement of which includes: The scanning unit is used to scan at least one row or column of nodes on the touch screen to generate a touch signal corresponding to each node; a conversion unit electrically connected to the scanning unit, and the conversion unit is used to convert the touch signal corresponding to each node into a saturation signal; The analysis unit is electrically connected to the conversion unit, and the analysis unit is used for detecting the saturation signal, and judging whether the touch screen is disturbed according to the detection times of the saturation signal within a preset time. The touch chip according to claim 10, wherein, if the analysis unit detects that the number of detections of the saturation signal within a preset time is less than the first threshold, the analysis unit determines that the node corresponding to the saturation signal is not disturbed. The touch chip according to claim 10, wherein if the analysis unit detects that the number of detections of the saturation signals corresponding to all nodes in the first direction of the touch screen within a preset time is greater than the first threshold and If it is smaller than the second threshold, the analysis unit determines that all nodes in the first direction are subject to the first interference, and the first interference is display interference. The touch chip as described in claim 10, further comprising: A calculation unit electrically connected to the scanning unit, the calculation unit is used to determine the user's touch area according to the touch signal; If the analysis unit detects that the detection times of the saturation signals corresponding to the nodes in the touch area are greater than the second threshold within a preset time, and the saturation signals corresponding to the nodes in the non-touch area are within a preset time If the times of detection within a time period are all less than the second threshold, the analysis unit determines that all nodes in the touch area are subject to the second interference, and the second interference is power common-mode interference. The touch chip as described in claim 10, further comprising: an amplifying unit electrically connected to the scanning unit, the amplifying unit is used to receive a touch signal and convert the touch signal into a voltage signal; a filter unit, electrically connected to the amplifying unit, and the filter unit is used to filter the voltage signal; The analog-to-digital conversion unit is electrically connected to the filter unit, and the analog-to-digital conversion unit is used to convert the filtered voltage signal into a saturated signal. An electronic device, the improvement of which is that the electronic device includes the touch chip according to any one of claims 10-14.

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