WO2024012499A1 - 触摸屏干扰检测方法、触控芯片以及电子设备 - Google Patents

触摸屏干扰检测方法、触控芯片以及电子设备 Download PDF

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Publication number
WO2024012499A1
WO2024012499A1 PCT/CN2023/107069 CN2023107069W WO2024012499A1 WO 2024012499 A1 WO2024012499 A1 WO 2024012499A1 CN 2023107069 W CN2023107069 W CN 2023107069W WO 2024012499 A1 WO2024012499 A1 WO 2024012499A1
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Prior art keywords
touch
signal
nodes
interference
touch screen
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PCT/CN2023/107069
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English (en)
French (fr)
Inventor
肖钡
罗欢
史爱焕
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敦泰科技(深圳)有限公司
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Publication of WO2024012499A1 publication Critical patent/WO2024012499A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Definitions

  • the present application relates to the field of touch technology, and in particular, to a touch screen interference detection method, a touch chip and an electronic device.
  • touch screens have become more widely used.
  • the touch screen can sense the user's touch action and thereby generate a touch signal to feedback the user's touch location. But when the touch screen is interfered with, the touch signal will undergo saturation distortion, affecting the accuracy of the touch position.
  • it can be determined whether the touch screen is interfered by determining whether the amplitude of the touch signal exceeds a threshold.
  • the interference of the touch screen includes power supply common mode interference and display interference.
  • the inventor found that due to the difference in the interference principles of these two types of noise interference, the data characteristics are different. He wanted to eliminate these two noise interferences respectively.
  • the impact of various interferences on touch signals requires accurate identification and differentiation of them.
  • existing technology cannot distinguish interference types.
  • this 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.
  • this application provides a touch screen interference detection method, which includes: scanning at least one row or column of nodes on the touch screen to generate a touch signal corresponding to each node; converting the touch signal corresponding to each node into a saturated signal; detecting saturation signal, and determine whether the touch screen is interfered based on the number of detections of the saturation signal within a preset time.
  • the number of detections 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 interfered with.
  • 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 by The first interference, the first interference is display interference.
  • the user's touch area is determined based on the touch signal; the number of detections of saturation signals corresponding to nodes in the touch area is greater than the second threshold within a preset time, and the saturation signals corresponding to nodes in the non-touch area are If the number of detections of the signal within the preset time is less than the second threshold, it is determined that all nodes in the touch area are subject to the second interference.
  • the second interference is the common mode interference of the power supply.
  • the touch screen is a self-capacitive touch panel
  • touch electrodes are provided on the touch panel
  • each touch electrode constitutes a node
  • the touch screen is a mutual capacitive touch panel or a self-integrated touch panel.
  • the touch panel is provided with insulating and intersecting touch electrodes in the first direction and the second direction. The insulating intersection of the touch electrodes forms a node.
  • saturation signals of all nodes in the touch panel are detected, and whether the touch screen is interfered is determined based on the number of detections of the saturation signal within a preset time.
  • the touch screen counts the number of detections of saturation signals corresponding to nodes in the first direction within a preset time, specifically referring to the sum of the number of detections of saturation signals corresponding to all nodes in the second direction within a preset time. or average.
  • 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 row plus a column of nodes, and detects a combination of nodes according to the saturation signal of the node. The number of detections within a preset time determines whether the touch screen is interfered with.
  • the present application provides a touch chip, including a scanning unit for scanning at least one row or column of nodes on the touch screen and generating a touch signal corresponding to each node; a conversion unit electrically connected to the scanning unit, and the conversion unit is The touch signal corresponding to each node is 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 determine whether the touch screen is interfered based on the number of detections of the saturation signal within a preset time.
  • the analysis unit determines that the node corresponding to the saturated signal is not interfered with.
  • the analysis unit determines that the first party All nodes upward are subject to the first interference, and the first interference is display interference.
  • the touch chip also includes a computing unit, electrically connected to the scanning unit, and the computing unit is used to determine the user's touch area based on the touch signal; if the analysis unit detects that the saturation signal corresponding to the node in the touch area is The number of detections within the preset time is greater than the second threshold, and the number of detections of the saturated signals corresponding to the nodes in the non-touch area within the preset time is less than the second threshold, and the analysis unit determines that all nodes in the touch area are subject to the second interference.
  • the second interference is the common mode interference of the power supply.
  • the touch chip also includes an amplification unit, electrically connected to the scanning unit, the amplification 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, the filtering unit It is used to filter the voltage signal; the analog-to-digital conversion unit is electrically connected to the filtering unit, and the analog-to-digital conversion unit is used to convert the filtered voltage signal into a saturated signal.
  • this application provides an electronic device, which includes the above-mentioned touch chip.
  • the touch screen interference detection method, touch chip and electronic device provided by this application can determine the user's touch position through the touch signals output by the nodes on the touch panel, as well as whether the touch panel is interfered, the type of interference and the interference affected area, thereby The cause of interference can be analyzed accurately and quickly and interference can be reduced.
  • Figure 1 is a structural diagram of the touch screen interference detection system provided by this application.
  • Figure 2 is a schematic structural diagram of a self-capacitive touch panel.
  • FIG. 3A is a schematic structural diagram of a mutual capacitive touch panel.
  • FIG. 3B is another structural schematic diagram of a mutual capacitive touch panel.
  • Figure 4 is a structural diagram of the conversion unit in Figure 1.
  • Figure 5 is a flow chart of the touch screen interference detection method provided by this application.
  • Figure 6 is a schematic diagram of an electronic device provided by this application.
  • Touch screen interference detection system 10 Touch panel 11 Node 110 Control unit 12 Scanning unit 121 Computing unit 122 Conversion unit 123 Amplification unit 1231 Filter unit 1232 Analog-to-digital conversion unit 1233 Analysis unit 124 Scan line T x1 -T xm Receive line R x1 -R xn Sensing channel S x1 -S xn
  • 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.
  • first application, second application, etc. are used to distinguish different applications, rather than to describe a specific order of applications.
  • Features defined as “first” and “second” may explicitly or implicitly include one or More of this feature.
  • the touch screen interference detection system 10 for detecting whether the touch screen is interfered and 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 scanning lines T x1 -T xm are electrically connected to the touch electrodes on the touch panel 11 .
  • the m scan lines T When the touch screen is touched, the capacitance value of the touch electrode in the touch area changes, and the touch electrode The corresponding touch signal is output to the calculation unit 122 , 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.
  • the conversion unit 123 is used to receive the touch signal output by the touch panel 11 and convert the touch signal into a saturation signal.
  • the analysis unit 124 is configured to receive the saturation signal and the area signal, and determine whether the touch screen is interfered based on the saturation signal. If the touch screen is interfered, determine the type of interference and the interference area.
  • the saturation signal can indicate whether the amplitude of the touch signal exceeds the preset threshold, so the analysis unit 124 can determine whether the touch screen is interfered based on the saturation signal.
  • the touch panel 11 is a self-capacitive touch panel.
  • the touch panel 11 includes a plurality of touch electrodes, and each capacitive coupling point is named a node.
  • the control unit 12 can sense the capacitive coupling point by The change in capacitance value determines the touch action that occurs on the touch panel.
  • node 110 one end of the touch electrode in node 110 is grounded, and the other end of the touch electrode in node 110 is electrically connected to the scan line T xi , where 1 ⁇ i ⁇ m.
  • the capacitance value of the touch electrode in the node to ground changes, and the node outputs a touch signal through the sensing channel S x1 -S xn .
  • the touch signal is associated with the capacitance value of the touch electrode in the node. If the control The unit 12 determines the change in the capacitance value of the touch electrode in the node, and then determines the user's touch position based on the change in the touch signal.
  • the types of interference encountered by the touch screen during use include at least one of first interference and second interference, and the first interference is display interference.
  • first interference is display interference.
  • Display interference is interference caused by the display component displaying different content at different times. The amplitude of the display interference will change as the display content changes.
  • the second interference is the common mode interference of the power supply.
  • the common mode interference of the power supply is interference caused by voltage fluctuations and power grid interference signals when the charging and discharging equipment (for example, a charger) is connected to the touch panel 11.
  • the common mode interference of the power supply may occur when the user touches the touch panel 11. When the panel 10 is touched, the touch area is affected, or the common mode interference of the power supply may affect all nodes in the second direction (eg, column direction).
  • the touch panel 11 is a mutual capacitive touch panel.
  • 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 each other, and the intersections of the scanning lines and receiving lines are insulated.
  • a node is created at the intersection of each receive line and each scan line.
  • node 110 is generated at the intersection of the receiving line R x1 and the scanning line T x1 .
  • N receiving lines R x and M scanning lines T x generate a total of M*N nodes.
  • 4 receiving lines R x and 4 scanning lines T x generate 4*4 total of 16 nodes.
  • the control unit 12 determines that the touch signal changes, it can determine the change in the capacitance value of the touch electrode at the node, thereby determining the user's touch area.
  • 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.
  • the filter unit 1232 is electrically connected to the analog-to-digital conversion unit.
  • Unit 1233, the analog-to-digital conversion unit 1233 is electrically connected to the analysis unit 124.
  • the amplifying unit 1231 is used to receive the touch signal and convert the touch signal into a voltage signal.
  • the amplifier 123a may include a charge amplifier, and the charge amplifier may convert the touch signal of the charge change amount of the touch electrode on the node into voltage signal.
  • the amplification unit 1231 is used to receive a touch signal and convert the touch signal into a current signal.
  • the filtering unit 1232 is used to filter the voltage signal. It can be understood that filtering the voltage signal can filter out the noise component in the voltage signal.
  • the filtering unit 1232 includes an adaptive notch filter (Adaptive Notch Filter, ANF).
  • ANF Adaptive Notch Filter
  • 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. A digital signal exceeding the preset threshold is defined as a saturated signal. The analysis unit 124 may calculate the number of times the saturation signal is detected within a preset time, determine whether the touch screen is interfered based on the number of detections of the saturation signal, and determine the type of interference based on the corresponding touch signal.
  • the touch panel 11 is a self-capacitive touch panel. After the scanning lines T x1 -T xm on the self-capacitive touch panel provide an excitation signal, the sensing of the touch panel 11 in the time period T x1 -T xm Channels S x1 -S xn output corresponding touch signals.
  • each time period from T x1 to T xm is the time period from when the corresponding excitation signal is sent to the end of the waveform.
  • the analysis unit 124 counts the number of times the saturation signal corresponding to each node is detected within the preset time, as shown in Table 1:
  • the number of saturated signals is the total number of triggered interferences of the nodes on the corresponding sensing channels S x1 -S xn in each time period T x1 -T xm .
  • the number of detections of the saturated signal corresponding to each node in the first direction (ie, the direction of the sensing channel S x1 -S xn , in this embodiment the row direction) within the preset time is greater than the first threshold (for example, the first threshold may be 100), and both are less than the second threshold (for example, the second threshold may be 130), that is, the detection times of the saturated 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 the touch panel 11 is subject to display interference.
  • the first threshold and the second threshold may be different.
  • the first threshold in the T x1 time period, the first threshold can be set to 100 and the second threshold can be set to 130, and in the T is 65. If the detection times of the saturation signals corresponding to all nodes in the same scanning time period within the preset time are between the corresponding first threshold and the second threshold, the analysis unit 124 may determine that the touch Touch panel 11 is subject to display interference.
  • the analysis unit 124 counts the number of detections of the saturated signal corresponding to each node within the preset time, as shown in Table 2:
  • 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 within the preset time is zero, but the units located in the touch area In the second direction in Table 2 (i.e., the scanning channel T x1 -T xm direction, in this embodiment, the column direction), that is, the detection of the saturated signals corresponding to the adjacent nodes on the two columns S x3 and S x4 within the preset time If the number of times is significantly larger than other areas, the analysis unit 124 can determine that the touch panel 11 is subject to power common mode interference.
  • the data in the S x3 column is relatively larger than the data in the S x4 column. It can be understood that due to the influence of the finger contact area, the user's finger is relatively biased toward the S x3 side.
  • the calculation unit 122 determines based on the touch signal that the user's touch area is the area enclosed by the sensing channels S x3 -S x4 and the scan lines T x2 -T x3 , there are four nodes in the touch area. For each node outside the touch area, the number of detections of the saturated signal corresponding to the node in the first direction (i.e., the direction of the sensing channel S x1 -S xn ) in Table 3 is similar within the preset time. Please refer to T x1 , T x4 , Based on the node values in the T x (m-1) and T xm directions, the analysis unit 124 can determine that the touch panel 11 is subject to display interference.
  • the analysis unit 124 can determine that the touch panel 11 is subject to power supply common mode interference.
  • the detection times of the saturation signals corresponding to all nodes on the touch panel 11 in Table 4 do not exceed the preset threshold within the preset time, and the analysis unit 124 can determine that the touch panel 11 is not interfered with.
  • the touch panel 11 is a mutual capacitive touch panel or a self-mutual capacitive 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 corresponding touch signals. There are m*n nodes, and m*n saturations can be obtained. Test data.
  • the analysis unit 124 counts the number of times the saturation signal corresponding to each node is detected within the preset time, as shown in Table 5:
  • the m*n saturation detection data in the analysis unit table 5 are in the first direction (ie, the direction of the receiving line R x1 -R xn , which is the row direction in this embodiment).
  • the number of detections of the saturated signal corresponding to each node within the preset time is greater than the first threshold (for example, the first threshold may be 100), and is less than the second threshold (for example, the second threshold may be 130), that is
  • the detection times of the saturation signals corresponding to each node in the first direction in Table 5 are similar within the preset time, and the analysis unit 124 can determine that the touch panel 11 is subject to display interference.
  • the first threshold and the second threshold may be different.
  • the first threshold in the T x1 time period, the first threshold can be set to 100 and the second threshold can be set to 130, and in the T . If the detection times of the saturation signals corresponding to all nodes in the same scanning time period within the preset time are between the corresponding first threshold and the second threshold, the analysis unit 124 may determine that the touch surface Board 11 is suffering from display interference.
  • the analysis unit 124 counts the number of detections of the saturated signal corresponding to each node within the preset time, as shown in Table 6:
  • the number of detections of the saturation signal of the node in the user's touch area within the preset time is not zero.
  • the second direction in the unit table 6 where the touch area is located i.e., the direction of the scanning channel T x1 -T xm , which is the column direction in this embodiment
  • the analysis unit 124 may determine that the touch panel 11 is subject to power common mode interference.
  • the analysis unit 124 can determine that the touch panel 11 is subject to display interference. Furthermore, in the touch area, if the detection times of the saturation signals corresponding to the nodes in the first direction within the preset time are greater than the corresponding second threshold, then the analysis unit 124 can determine that the touch panel 11 is subject to power supply common mode interference.
  • the detection times of the saturation signals corresponding to all nodes on the touch panel 11 in Table 8 do not exceed the preset threshold within the preset time, and the analysis unit 124 can determine that the touch panel 11 is not interfered with.
  • the touch panel 11 includes a mutual capacitance touch panel or a self-mutual capacitance integrated touch panel.
  • the scanning lines T x1 -T xm provide excitation signals
  • the receiving lines R x1 -R xn output corresponding touch signals.
  • the conversion unit 123 converts the touch signal into a corresponding saturation signal.
  • the analysis unit 124 can count the number of detections of the saturated signal corresponding to the node in the first direction (ie, the direction of the receiving line R x1 -R xn ) within a preset time, where R xs refers to the second direction (ie, the scan line T x1 - The sum or average of the number of detections of the saturated signals corresponding to all nodes in the T x n direction) within the preset time.
  • the data of the receiving line R x1 refers to the sum or average number of detection times of the saturated signals corresponding to all nodes in the column where the receiving line R x1 is located within a preset time.
  • the noise distribution can be counted by rows, and only the N saturated signal times can be analyzed, instead of counting the noise distribution of each node (that is, M*N nodes).
  • the statistical data of analysis unit 124 is shown in Table 9:
  • the number of detections of saturation signals of two 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 within the preset time is zero. That is, there are interferences of different magnitudes in 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 subject to power common mode interference.
  • the analysis unit 124 counts the number of detections of the saturated signal corresponding to the node within the preset time, it is as shown in Table 11:
  • the saturation signals corresponding to the nodes in the first direction ie, the direction of the receiving line R x1 -R xn ) in Table 11 are detected within the preset time.
  • the number of times is similar, and in the touch area, the number of detections of the saturation signal corresponding to the node in the first direction within the preset time is greater than the corresponding second threshold, then the analysis unit 124 can determine that the touch panel 11 has both suffered display interference and Received common mode interference from the power supply.
  • the analysis unit 124 counts the number of detections of the saturated signal corresponding to the node within the preset time, it is as shown in Table 12:
  • the detection times of the saturation signals corresponding to all nodes on the touch panel 11 in Table 12 do not exceed the preset threshold within the preset time, and the analysis unit 124 can determine that the touch panel 11 is not interfered with.
  • the touch panel 11 is a self-capacitive touch panel or a self-mutual capacitive integrated touch panel.
  • the scanning lines T x1 -T xm provide excitation signals
  • the receiving lines R x1 -R xn output corresponding touch signals.
  • the conversion unit 123 converts the touch signal into a corresponding saturation signal.
  • the self-mutual capacitance integrated touch panel uses the method of detecting "M+N" nodes and distinguishes power supply common mode interference and display interference.
  • the M pieces of 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 pieces of 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 number of detection times of the saturated signals corresponding to all nodes in the second direction (ie, the direction of the scan line T x1 -T xm ) within a preset time.
  • the data of the receiving line R x1 refers to the sum or average number of detection times of the saturated signals corresponding to all nodes in the column where the receiving line R x1 is located within a preset time.
  • T xs refers to the sum or average of the number of detections of the saturated signals corresponding to all nodes in the first direction (ie, the direction of the receiving line R x1 -R xn ) within a preset time.
  • the data of the receiving line T x1 refers to the sum or average number of detection times of the saturated signals corresponding to all nodes in the row of the receiving line T x1 within a preset time.
  • the analysis unit 124 can also separately count the detection times of the saturated signals corresponding to the nodes in the first direction and the second direction within a preset time, for example, as shown in Table 13:
  • the detection times of the saturation signals corresponding to the nodes in the first direction (R xn direction, row direction) in Table 13 are similar within the preset time, and the detection times in the second direction are similar.
  • the detection times of the saturation signals corresponding to the nodes in the (T xm direction, column direction) are similar within the preset time, and the analysis unit 124 can determine that the touch panel 11 is only subject to display interference.
  • the analysis unit 124 determines that the user's touch area is the area enclosed by the receiving lines R x3 -R x4 and the scanning lines T x2 -T x3 , the analysis unit 124 counts the The number of detections of the saturated signals corresponding to the nodes in one direction and the second direction within the preset time is shown in Table 14:
  • the analysis Unit 124 may determine that touch panel 11 is subject to power supply common mode interference.
  • 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 scanning lines T x2 -T x3 and the receiving lines R x3 -R x4 . If the analysis unit 124 respectively counts the detection times of the saturated signals corresponding to the nodes in the first direction and the second direction within the preset time, as shown in Table 15:
  • the saturation signal corresponding to the node in the first direction ie, the direction of the receiving line R x1 -R xn ) in Table 15 is detected within the preset time.
  • the number of times is similar, and in the touch area, the detection times of the saturation signal corresponding to the node in the first direction within the preset time are all greater than the corresponding second threshold.
  • the detection times of the saturation signals corresponding to the nodes in the second direction are similar 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 within the preset time are all greater than the corresponding second threshold, the analysis unit 124 can determine that the touch panel 11 has suffered both display interference and power supply common mode interference when the user has experienced it.
  • 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 interfered with.
  • the analysis unit 124 can also count the number of detections of saturation signals corresponding to all nodes on the touch panel 11 within a preset time, thereby determining whether the touch panel 11 is subject to interference and the type of interference.
  • the specific determination method is the same as Table 1- Table 16 describes this and will not be repeated here.
  • the touch screen interference detection system 10 provided by this application can determine the user's touch position through the touch signals output by the nodes on the touch panel, as well as whether the touch panel is interfered and the type of interference, thereby accurately and quickly reducing interference.
  • This application provides a touch screen interference detection method, which is applied to a touch screen device. This 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:
  • S1 Scan at least one row or column of nodes on the touch screen and generate a touch signal corresponding to each node.
  • the m scanning lines T x1 -T xm in the scanning unit 121 provide excitation signals (for example, square wave signals or sine wave oscillation signals) to nodes on the touch panel 11 , and the nodes receive signals through the sensing channels S x1 -S xn or Line R x1 -R xn output touch
  • the signal is sent to the calculation unit 122 and the conversion unit 123 .
  • S2 Determine the user's touch area based on the touch signal.
  • 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 determine that the touch signal in the node changes. The capacitance value of the control electrode changes to determine the user's touch area, and a signal representing the touch area is transmitted to the analysis unit 124 .
  • converting the touch signal corresponding to each node into a saturated signal by the conversion unit 123 may further include: the amplification unit 124 receives the touch signal and converts the touch signal into a voltage signal; and the filtering unit 125 filters the voltage signal. ; The analog-to-digital conversion unit 126 converts the filtered voltage signal into a saturated signal.
  • the saturation signal is used to indicate whether the amplitude of the touch signal exceeds the preset threshold. It can be understood that if the amplitude of the touch signal exceeds the preset threshold, the corresponding node may be interfered.
  • S4 Detect the saturation signal, and determine whether the touch screen is interfered based on the number of detections of the saturation signal within the preset time.
  • the analysis unit 124 can determine whether the touch panel 11 is interfered and the type of interference based on the number of detections of the saturation signal corresponding to the connecting node within a preset time.
  • the analysis unit 124 determines that the node corresponding to the saturated signal is not interfered with.
  • 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 third threshold. An interference.
  • the analysis unit 124 detects that the detection times of the saturation signals corresponding to the nodes in the touch area are greater than the second threshold within the preset time, and the saturation signals corresponding to the nodes in the non-touch area are within the preset time. If the number of detections in the touch area is less than the second threshold, the analysis unit 124 determines that all nodes in the touch area are subject to the second interference.
  • the electronic device 100 includes the touch screen interference detection system 10 in the above embodiment.
  • electronic device 100 includes, but is not limited to, a portable or mobile device, a cell phone, a tablet, a television, a personal digital assistant, a laptop, a desktop, a handheld PC, a server, a network device, a graphics device, 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 reality and/or augmented reality devices, things Networking equipment, industrial control equipment, vehicle infotainment equipment, streaming media client equipment, e-book reading equipment, or other electronic equipment with touch screens that can achieve touch control.
  • a portable or mobile device a cell phone, a tablet, a television, a personal digital assistant, a laptop, a desktop, a handheld PC, a server, a network device, a graphics device, Video game devices, cellular phones, portable media players, handheld devices, wearable devices (e.g., display glasses or goggles, head-mounted displays, watches, headsets

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  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
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  • Position Input By Displaying (AREA)

Abstract

一种触摸屏干扰检测方法，包括：扫描触摸屏上的至少一个节点(110)，以生成每个节点(110)对应的触摸信号(S1)；将每个节点(110)对应的触摸信号对应转换为饱和信号(S3)；检测饱和信号，并根据饱和信号在预设时间内的检测次数判定触摸屏是否受到干扰(S4)。还提供一种触控芯片以及电子设备(100)。由此，触摸屏干扰检测方法、触控芯片以及电子设备(100)，可以判定触摸屏是否受到干扰、干扰类型以及干扰影响区域。

Description

触摸屏干扰检测方法、触控芯片以及电子设备
相关文献的交叉引用
本申请要求于2022年7月14日提交中国专利局、申请号为202210854347.7，发明名称为“触摸屏干扰检测方法、触控芯片以及电子设备”的中国专利的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及触摸技术领域，尤其涉及一种触摸屏干扰检测方法、触控芯片以及电子设备。
背景技术
随着电子科技的发展，触摸屏得到了更为广泛的应用。触摸屏可以感测用户的触摸动作，从而生成触摸信号，以反馈用户的触摸位置。但当触摸屏受到干扰时，触摸信号会发生饱和失真，影响触摸位置的精确性。现有技术中，通过判断触摸信号的幅度是否超出阈值，可以判断触摸屏是否受到干扰。然而，触摸屏的干扰包括电源共模干扰以及显示干扰，发明人在工作过程中发现，由于这两种噪声干扰在干扰原理上的不同，造成在数据方面的特征不一样，想要分别消除这两种干扰对触摸信号的影响，那就需要准确的识别和区分它们。但现有技术无法区分出干扰类型。
发明内容
鉴于上述问题，本申请提供一种触摸屏干扰检测方法、触控芯片以及电子设备，可以检测触摸屏是否受到干扰以及干扰类型。
第一方面，本申请提供一种触摸屏干扰检测方法，包括：扫描触摸屏上的至少一行或一列节点，生成每个节点对应的触摸信号；将每个节点对应的触摸信号对应转换为饱和信号；检测饱和信号，并根据饱和信号在预设时间内的检测次数判定触摸屏是否受到干扰。
在一些可能的实现方式中，若饱和信号在预设时间内的检测次数小于第一阈值，判定饱和信号对应的节点没有受到干扰。
在一些可能的实现方式中，触摸屏的第一方向上的所有节点对应的饱和信号在预设时间内的检测次数均大于第一阈值而小于第二阈值，判定触摸屏的第一方向上所有节点受到第一干扰，第一干扰为显示干扰。
在一些可能的实现方式中，根据触摸信号确定用户的触摸区域；触摸区域中的节点对应的饱和信号在预设时间内的检测次数均大于第二阈值，且非触摸区域中的节点对应的饱和信号在预设时间内的检测次数均小于第二阈值，则判定触摸区域中所有节点受到第二干扰，第 二干扰为电源共模干扰。
在一些可能的实现方式中，触摸屏为自电容式触摸面板，触摸面板上设置触控电极，每个触控电极构成一个节点。
在一些可能的实现方式中，触摸屏为互电容式触摸面板或自互一体式触控面板，触摸面板第一方向和第二方向设置绝缘相交的触控电极，触控电极的绝缘相交处构成一个节点。
在一些可能的实现方式中，检测触控面板内所有节点的饱和信号，并根据饱和信号在预设时间内的检测次数判定触摸屏是否受到干扰。
在一些可能的实现方式中，触摸屏统计第一方向上节点对应的饱和信号在预设时间内的检测次数，具体是指第二方向上所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。
在一些可能的实现方式中，触摸屏为自容式触摸面板或自互一体式触控面板，触摸屏检测随机一行节点、一列节点或一行加一列节点组合的任意一种方式，并根据节点的饱和信号在预设时间内的检测次数判定触摸屏是否受到干扰。
第二方面，本申请提供一种触控芯片，包括扫描单元，用于扫描触摸屏上的至少一行或一列节点，生成每个节点对应的触摸信号；转换单元，电连接于扫描单元，转换单元用于将每个节点对应的触摸信号对应转换为饱和信号；分析单元，电连接于转换单元，分析单元用于检测饱和信号，并根据饱和信号在预设时间内的检测次数判定触摸屏是否受到干扰。
在一些可能的实现方式中，若分析单元检测到饱和信号在预设时间内的检测次数小于第一阈值，分析单元判定饱和信号对应的节点未受到干扰。
在一些可能的实现方式中，若分析单元检测到触摸屏的第一方向上所有节点对应的饱和信号在预设时间内的检测次数均大于第一阈值而小于第二阈值，分析单元判定第一方向上所有节点受到第一干扰，第一干扰为显示干扰。
在一些可能的实现方式中，触控芯片还包括计算单元，电连接于扫描单元，计算单元用于根据触摸信号确定用户的触摸区域；若分析单元检测到触摸区域中的节点对应的饱和信号在预设时间内的检测次数均大于第二阈值，且非触摸区域中的节点对应的饱和信号在预设时间内的检测次数均小于第二阈值，分析单元判定触摸区域中所有节点受到第二干扰，第二干扰为电源共模干扰。
在一些可能的实现方式中，触控芯片还包括放大单元，电连接于扫描单元，放大单元用于接收触摸信号，并将触摸信号转换为电压信号；滤波单元，电连接于放大单元，滤波单元用于对电压信号进行滤波；模数转换单元，电连接于滤波单元，模数转换单元用于将滤波后的电压信号转换为饱和信号。
第三方面，本申请提供一种电子设备，电子设备包括上述的触控芯片。
由此，本申请提供的触摸屏干扰检测方法、触控芯片以及电子设备，可以通过触摸面板上节点输出的触摸信号判定用户的触摸位置，以及触摸面板是否受到干扰、干扰类型以及干扰影响区域，从而可以准确、快速地分析干扰原因以及降低干扰。
附图说明
图1为本申请提供的触摸屏干扰检测系统的结构图。
图2为自电容式触摸面板的结构示意图。
图3A为互电容式触摸面板的一种结构示意图。
图3B为互电容式触摸面板的另一种结构示意图。
图4为图1中转换单元的结构图。
图5为本申请提供的触摸屏干扰检测方法的流程图。
图6为本申请提供的电子设备的示意图。
主要元件符号说明
触摸屏干扰检测系统     10
触摸面板               11
节点                   110
控制单元               12
扫描单元               121
计算单元               122
转换单元               123
放大单元               1231
滤波单元               1232
模数转换单元           1233
分析单元               124
扫描线                 Tx1-Txm
接收线                 Rx1-Rxn
感应通道               Sx1-Sxn
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
本申请实施例中，“第一”、“第二”等词汇，仅是用于区别不同的对象，不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。例如，第一应用、第二应用等是用于区别不同的应用，而不是用于描述应用的特定顺序，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。
请参阅图1，本申请提供一种触摸屏干扰检测系统10，用于检测触摸屏是否受到干扰以及受到干扰的类型与干扰强度。触摸屏干扰检测系统10包括触摸面板11、以及控制单元12。
控制单元12包括扫描单元121、计算单元122、转换单元123与分析单元124，扫描单元121包括m条扫描线Tx1-Txm，m条扫描线Tx1-Txm延伸至触摸面板11上，且m条扫描线Tx1-Txm电连接于触摸面板11上的触控电极。在一些实施方式中，m条扫描线Tx1-Txm用于向触摸面板11提供激励信号(例如，方波信号或正弦波振荡信号)，触摸面板11包括至少一个触控电极，当用户触摸到触摸屏时，触摸区域内的触控电极的电容值变化，该触控电极 输出对应的触摸信号到计算单元122，计算单元122可以根据触摸信号确定用户的触摸区域，并输出区域信号到分析单元124。
转换单元123电连接于触摸面板11以及分析单元124，转换单元123用于接收触摸面板11输出的触摸信号，并将触摸信号转换为饱和信号。
分析单元124用于接收饱和信号以及区域信号，并根据饱和信号判断触摸屏是否受到干扰，若触摸屏受到干扰，判断干扰类型以及干扰区域。
可以理解，若触摸屏受到干扰，触摸信号的幅值会超过预设阈值，饱和信号可以指示触摸信号的幅度是否超出预设阈值，从而分析单元124可以根据饱和信号判断触摸屏是否受到干扰。
请参阅图2，在一些实施方式中，触摸面板11为自电容式触摸面板，触摸面板11包括多个触控电极，命名每个电容耦合处为节点，控制单元12可通过感测电容耦合处的电容值变化判断发生在触摸面板上的触摸动作。
图2中行方向有N个触控电极，列方向有M个电极，因此会有M*N个节点。
在Tx1时刻，扫描第一行Sx1-Sxn所有的通道，在Tx2时刻，扫描第二行Sx1-Sxn所有通道，依次类推到Txm时刻，即完成整个触摸面板的扫描，产生M*N个饱和检测数据。
以节点110为例，节点110中触控电极的一端接地，节点110中触控电极的另一端电连接于扫描线Txi，其中1≤i≤m。当用户触摸到触摸屏时，节点中触控电极对地电容值变化，节点通过感应通道Sx1-Sxn输出触摸信号，可以理解，触摸信号与节点中触控电极的电容值相关联，若控制单元12判定节点中触控电极的电容值变化，则可根据触摸信号变化确定用户的触摸位置。
触摸屏在使用过程中碰到的干扰类型包括第一干扰与第二干扰的至少一种，第一干扰为显示干扰。可以理解，当触摸装置包括显示部件时，触摸面板11临近设置于显示部件，显示部件用于向用户显示内容。显示干扰是由显示部件在不同时刻显示不同内容引发的干扰，显示干扰的幅度会跟随显示内容变化而变化。
第二干扰为电源共模干扰。举例说明，电源共模干扰是由充放电设备(例如，充电器)连接触摸面板11时，由于电压波动以及电网干扰信号引发的干扰，在一些实施方式中，电源共模干扰可能在用户触摸到触摸面板10时，对触摸区域造成影响，或者，电源共模干扰可能影响第二方向(例如，列方向)上所有的节点。
请参阅图3A及图3B，此实施方式中，触摸面板11为互电容式触摸面板，扫描单元121包括m条扫描线Tx1-Txm和n条接收线Rx1-Rxn，扫描线和接收线分别延伸于触摸面板11上，且m条扫描线Tx1-Txm与n条接收线Rx1-Rxn彼此垂直相交，且扫描线和接收线相交处绝缘。每条接收线与每条扫描线的交点处会产生一个节点。
以节点110为例，节点110在接收线Rx1与扫描线Tx1的交点处产生。图3A中N条接收线Rx与M条扫描线Tx共产生M*N个节点。图3B中4条接收线Rx与4条扫描线Tx产生4*4共16个节点。
当用户触摸到触摸屏时，节点中触控电极的电容值变化，节点通过接收线Rxj向控制单元12输出触摸信号，可以理解，触摸信号与节点处触控电极的电容值相关联，若控制单元12确定触摸信号变化，则可确定节点处触控电极的电容值变化，从而确定用户的触摸区域。
请参阅图4，在一些实施方式中，转换单元123包括放大单元1231、滤波单元1232以及模数转换单元1233，放大单元1231电连接于节点以及滤波单元1232，滤波单元1232电连接于模数转换单元1233，模数转换单元1233电连接于分析单元124。
此实施方式中，放大单元1231用于接收触摸信号，并将触摸信号转换为电压信号，具体地，放大器123a可以包括电荷放大器，电荷放大器可以将节点上触控电极电荷变化量的触摸信号转换为电压信号。其它实施方式中，放大单元1231用于接收触摸信号，并将触摸信号转换为电流信号。
滤波单元1232用于对电压信号进行滤波，可以理解，对电压信号进行滤波可以滤除电压信号中的噪声分量。在一些实施方式中，滤波单元1232包括自适应陷波滤波器(Adaptive Notch Filter，ANF)。
模数转换单元1233用于将滤波后的模拟信号转换为数字信号，可以理解，分析单元124可以判定数字信号的幅度是否超过预设阈值，超出预设阈值的数字信号定义为饱和信号。分析单元124可以在预设时间内计算检测到饱和信号的次数，并根据饱和信号的检测次数判断触摸屏是否受到干扰，并且根据对应的触摸信号判断受到干扰的类型。
在一些实施方式中，触摸面板11为自电容式触摸面板，自电容式触摸面板上的扫描线Tx1-Txm提供激励信号后，在Tx1-Txm时间段内，触摸面板11的感应通道Sx1-Sxn输出对应的触摸信号。此处Tx1-Txm各个时间段为对应的激励信号从波形发出到结束的时间段。
分析单元124统计在预设时间内检测到每个节点对应的饱和信号的次数如表1所示：
表1
其中，饱和信号的次数为在Tx1-Txm各个时间段内对应的感应通道Sx1-Sxn上节点的总共触发干扰次数。
可以理解，在用户未触摸到触摸面板11的情况下，表1中共有m*n个饱和检测数据。在第一方向(即感应通道Sx1-Sxn方向，本实施例中为行方向)上的各个节点对应的饱和信号在预设时间内的检测次数均大于第一阈值(例如，第一阈值可以为100)，且均小于第二阈值(例如，第二阈值可以为130)，即表1中第一方向上的各个节点对应的饱和信号在预设时间内的检测次数相近，分析单元124可以判定触摸面板11受到了显示干扰。
需要说明，对于不同的扫描时间段，第一阈值以及第二阈值可以不同。例如，在Tx1时间段内，第一阈值可以设定为100，第二阈值可以设定为130，而在Tx2时间段内，第一阈值可以设定为55，第二阈值可以设定为65。若同一条扫描时间段所有节点对应的饱和信号在预设时间内的检测次数均在对应的第一阈值与第二阈值之间，则分析单元124可以判定触 摸面板11受到了显示干扰。
在另一些实施方式中，若用户触摸到触摸面板11，且计算单元122根据触摸信号确定用户的触摸区域为感应通道Sx3-Sx4与扫描线Tx2-Tx3围合的区域，分析单元124统计每个节点对应的饱和信号在预设时间内的检测次数如表2所示：
表2
可以理解，用户的触摸区域中节点的饱和信号在预设时间内的检测次数不为零，而其他区域中节点的饱和信号在预设时间内的检测次数为零，但触摸区域中所在的单元表2中第二方向(即扫描通道Tx1-Txm方向，本实施例中为列方向)，即Sx3和Sx4两列上的相邻节点对应的饱和信号在预设时间内的检测次数明显大于其他区域，则分析单元124可以判定触摸面板11受到了电源共模干扰。
本实施例中，Sx3列的数据相对大于Sx4列的数据，可以理解，受手指接触面积影响，用户的手指相对偏向于Sx3一侧。
可以理解，出现多处触摸区域时，电源共模干扰会出现在对应的多处触控区域中。
在本实施方式中，若分析单元124统计每个节点对应的饱和信号在预设时间内的检测次数如表3所示：
表3
若用户触摸到触摸面板11，且计算单元122根据触摸信号确定用户的触摸区域为感应通道Sx3-Sx4与扫描线Tx2-Tx3围合的区域，触摸区域内存在四个节点。触摸区域之外每个节点，表3中第一方向(即感应通道Sx1-Sxn方向)上的节点对应的饱和信号在预设时间内的检测次数相近，可参考Tx1、Tx4、Tx(m-1)、Txm方向的节点数值，则分析单元124可以判定触摸面板11受到了显示干扰。
进一步，在触摸区域内，第一方向上节点对应的饱和信号在预设时间内的检测次数均大于对应的第二阈值，则分析单元124可以判定触摸面板11受到了电源共模干扰。
在本实施方式中，若分析单元124统计每个节点对应的饱和信号在预设时间内的检测次数如表4所示：
表4
可以理解，表4中触摸面板11上所有节点对应的饱和信号在预设时间内的检测次数均未超出预设阈值，分析单元124可以判定触摸面板11没有受到干扰。
在一些实施方式中，触摸面板11为互电容式触摸面板或者自互电容一体式触摸面板。互电容式触摸面板上的扫描线Tx1-Txm提供激励信号后，触摸面板11的接收线Rx1-Rxn输出对应的触摸信号，存在m*n个节点，可以获得m*n个饱和检测数据。
分析单元124统计在预设时间内检测到每个节点对应的饱和信号的次数如表5所示：
表5
可以理解，在用户未触摸到触摸面板11的情况下，分析单元表5中m*n个饱和检测数据在第一方向(即接收线Rx1-Rxn方向，本实施例中为行方向)上的各个节点对应的饱和信号在预设时间内的检测次数均大于第一阈值(例如，第一阈值可以为100)，且均小于第二阈值(例如，第二阈值可以为130)，即表5中第一方向上的各个节点对应的饱和信号在预设时间内的检测次数相近，分析单元124可以判定触摸面板11受到了显示干扰。
需要说明，对于不同的扫描时间段，第一阈值以及第二阈值可以不同。例如，在Tx1时间段，第一阈值可以设定为100，第二阈值可以设定为130，而在Tx2时间段，第一阈值可以设定为55，第二阈值可以设定为65。若同一条扫描时间段所有节点对应的饱和信号在预设时间内的检测次数均在对应的第一阈值与第二阈值之间，则分析单元124可以判定触摸面 板11受到了显示干扰。
在另一些实施方式中，若用户触摸到触摸面板11，且计算单元122根据触摸信号确定用户的触摸区域为接收线Rx3-Rx4与扫描线Tx2-Tx3围合的区域，分析单元124统计每个节点对应的饱和信号在预设时间内的检测次数如表6所示：
表6
可以理解，用户的触摸区域中节点的饱和信号在预设时间内的检测次数不为零。但触摸区域所在的单元表6中第二方向(即扫描通道Tx1-Txm方向，本实施例中为列方向)，即Rx3和Rx4两列上的左右相邻节点对应的饱和信号在预设时间内的检测次数不为零，则分析单元124可以判定触摸面板11受到了电源共模干扰。
同理出现多处触控位置时，触控区域涉及列的数据会存在不同幅度的干扰。
在本实施方式中，若分析单元124统计每个节点对应的饱和信号在预设时间内的检测次数如表7所示：
表7
若用户触摸到触摸面板11，且计算单元122根据触摸信号确定用户的触摸区域为感应通道Sx3-Sx4与扫描线Tx2-Tx3围合的区域，触摸区域内存在四个节点。触摸区域之外每个节点，在表7中第一方向(即接收线Rx1-Rxn方向)上的节点对应的饱和信号在预设时间内的检测次数相近，可参考Tx1、Tx4、Tx(m-1)、Txm方向的节点数值，则分析单元124可以判定触摸面板11受到了显示干扰。进一步，在触摸区域内，第一方向上节点对应的饱和信号在预设时间内的检测次数均大于对应的第二阈值，则分析单元124可以判定触摸面板11受到了电源共模干扰。
在本实施方式中，若分析单元124统计每个节点对应的饱和信号在预设时间内的检测次 数如表8所示：
表8
可以理解，表8中触摸面板11上所有节点对应的饱和信号在预设时间内的检测次数均未超出预设阈值，分析单元124可以判定触摸面板11没有受到干扰。
在另一些实施方式中，触摸面板11包括互电容式触摸面板，或自互电容一体式触摸面板，扫描线Tx1-Txm提供激励信号后，接收线Rx1-Rxn输出对应的触摸信号，转换单元123将触摸信号转换为对应的饱和信号。分析单元124可以统计第一方向(即接收线Rx1-Rxn方向)上节点对应的饱和信号在预设时间内的检测次数，其中，Rxs是指第二方向(即扫描线Tx1-Txn方向)上所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。例如接收线Rx1的数据是指接收线Rx1所在列的所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。
本实施方式，可以按行统计噪声分布情况，仅针对N个饱和信号次数进行分析，而非统计每个节点(即M*N个节点)噪声分布情况。分析单元124统计数据如表9所示：
表9
可以理解，在用户未触摸到触摸面板11的情况下，表9中第一方向上的所有节点对应的饱和信号在预设时间内的检测次数相近，分析单元124可以判定触摸面板11受到了显示干扰。
在本实施方式中，若用户触摸到触摸面板11，且分析单元124确定用户的触摸区域位于接收线Rx3-Rx4围合区域内，分析单元124统计的所有节点对应的饱和信号在预设时间内的检测次数如表10所示：
表10
可以理解，用户的触摸区域中两个节点的饱和信号在预设时间内的检测次数不为零，而其他区域中节点的饱和信号在预设时间内的检测次数为零。即用户的触摸区域不同列上存在不同幅度的干扰，非触摸区域的列方向没有检测到干扰。则分析单元124可以判定触摸面板11受到了电源共模干扰。
在本实施方式中，若分析单元124统计的节点对应的饱和信号在预设时间内的检测次数如表11所示：
表11
可以理解，在用户触摸到触摸面板11的情况下，除触摸区域外，表11中第一方向(即接收线Rx1-Rxn方向)上的节点对应的饱和信号在预设时间内的检测次数相近，而在触摸区域内，第一方向上节点对应的饱和信号在预设时间内的检测次数均大于对应的第二阈值，则分析单元124可以判定触摸面板11既受到了显示干扰，又受到了电源共模干扰。
在本实施方式中，若分析单元124统计的节点对应的饱和信号在预设时间内的检测次数如表12所示：
表12
可以理解，表12中触摸面板11上所有节点对应的饱和信号在预设时间内的检测次数均未超出预设阈值，分析单元124可以判定触摸面板11没有受到干扰。
在另一些实施方式中，触摸面板11为自电容式触摸面板或自互电容一体式触摸面板，扫描线Tx1-Txm提供激励信号后，接收线Rx1-Rxn输出对应的触摸信号，转换单元123将触摸信号转换为对应的饱和信号。
自互电容一体式触摸面板采用检测“M+N”个节点的方法与区分电源共模干扰和显示干扰。M个数据是同一时间段内在扫描线Tx1-Txm方向上检测到的节点对应的饱和信号次数。N个数据是同一时间段内在接收线Rx1-Rxn方向上检测到的节点对应的饱和信号次数。Rxs是指第二方向(即扫描线Tx1-Txm方向)上所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。例如接收线Rx1的数据是指接收线Rx1所在列的所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。同理，Txs是指第一方向(即接收线线Rx1-Rxn方向)上所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。例如接收线Tx1的数据是指接收线Tx1所在行的所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。
分析单元124也可以分别统计第一方向以及第二方向上节点对应的饱和信号在预设时间内的检测次数，例如，如表13所示：
表13


可以理解，在用户未触摸到触摸面板11的情况下，表13中第一方向(Rxn方向，行方向)上的节点对应的饱和信号在预设时间内的检测次数相近，且第二方向(Txm方向，列方向)上的节点对应的饱和信号在预设时间内的检测次数相近，分析单元124可以判定触摸面板11只受到了显示干扰。
在本实施方式中，若用户触摸到触摸面板11，且分析单元124确定用户的触摸区域为接收线Rx3-Rx4与扫描线Tx2-Tx3围合的区域，分析单元124分别统计第一方向以及第二方向上节点对应的饱和信号在预设时间内的检测次数如表14所示：
表14

可以理解，用户的触摸区域中节点的饱和信号在预设时间内的检测次数不为零，且数值有差异，而其他区域中节点的饱和信号在预设时间内的检测次数为零，则分析单元124可以判定触摸面板11受到了电源共模干扰。
在本实施方式中，用户触摸到触摸面板11，且分析单元124确定用户的触摸区域为扫描线Tx2-Tx3与接收线Rx3-Rx4的围合区域。若分析单元124分别统计第一方向以及第二方向上节点对应的饱和信号在预设时间内的检测次数如表15所示：
表15


可以理解，在用户触摸到触摸面板11的情况下，触摸区域之外，表15中第一方向(即接收线Rx1-Rxn方向)上的节点对应的饱和信号在预设时间内的检测次数相近，而在触摸区域内，第一方向上节点对应的饱和信号在预设时间内的检测次数均大于对应的第二阈值。且触摸区域之外，表15中第二方向(即扫描线Tx1-Txm方向)上的节点对应的饱和信号在预设时间内的检测次数相近，而在触摸区域内，第二方向上节点对应的饱和信号在预设时间内的检测次数均大于对应的第二阈值，则分析单元124可以判定触摸面板11在用户既受到了显示干扰，又受到了电源共模干扰。
在本实施方式中，若分析单元124分别统计第一方向以及第二方向上节点对应的饱和信号在预设时间内的检测次数如表16所示：
表16

可以理解，表16中触摸面板11上所有节点对应的饱和信号在预设时间内的检测次数均未超出预设阈值，分析单元124可以判定触摸面板11没有受到干扰。
针对自电容式触摸面板或自互电容一体式触摸面板，因为单从Tx方向或单从Rx方向即可以检测与区分电源共模干扰与显示干扰，也可以定位到产生电源共模干扰和显示干扰的节点大概位置，所以，从资源节省角度，可以只使用以上的一个方向(如：Tx方向或Rx方向)来检测与区分电源共模干扰和显示干扰。
在一些实施方式中，分析单元124也可以统计触摸面板11上所有节点对应的饱和信号在预设时间内的检测次数，从而判定触摸面板11是否受到干扰及干扰类型，具体判定方法同表1-表16所述，在此不赘述。
由此，本申请提供的触摸屏干扰检测系统10，可以通过触摸面板上节点输出的触摸信号判定用户的触摸位置，以及触摸面板是否受到干扰及干扰类型，从而可以准确、快速地降低干扰。
请参阅图5，本申请提供一种触摸屏干扰检测方法，应用于触摸屏装置，该方法用于检测触摸屏是否受到干扰，以及受到干扰的类型。触摸屏干扰检测方法包括以下步骤：
S1：扫描触摸屏上的至少一行或一列节点，生成每个节点对应的触摸信号。
可以理解，扫描单元121中m条扫描线Tx1-Txm提供激励信号(例如，方波信号或正弦波振荡信号)给触摸面板11上的节点，节点通过感应通道Sx1-Sxn或接收线Rx1-Rxn输出触摸 信号到计算单元122以及转换单元123。
S2：根据触摸信号确定用户的触摸区域。
可以理解，当用户触摸到触摸屏时，节点中触控电极的电容值发生变化，触摸信号与节点中触控电极的电容值相关联，若计算单元122确定触摸信号变化，则可确定节点中触控电极的电容值变化，从而确定用户的触摸区域，并将表示触摸区域的信号传送至分析单元124。
S3：将每个节点对应的触摸信号对应转换为饱和信号。
在一些实施方式中，转换单元123将每个节点对应的触摸信号对应转换为饱和信号可以进一步包括：放大单元124接收触摸信号，并将触摸信号转换为电压信号；滤波单元125对电压信号进行滤波；模数转换单元126将滤波后的电压信号转换为饱和信号。
可以理解，饱和信号用于指示触摸信号的幅度是否超出预设阈值，可以理解，若触摸信号的幅值超出预设阈值，则对应节点可能受到干扰。
S4：检测饱和信号，并根据饱和信号在预设时间内的检测次数判定触摸屏是否受到干扰。
可以理解，参考表1-表12，分析单元124可以根据接节点对应的饱和信号在预设时间内的检测次数，判定触摸面板11是否受到干扰及干扰类型。
具体地，若在预设时间内，分析单元124检测到饱和信号在预设时间内的检测次数小于第一阈值，则分析单元124判定饱和信号对应的节点未受到干扰。
若在预设时间内，分析单元124检测到饱和信号在预设时间内的检测次数均大于第一阈值而小于第二阈值，则分析单元124判定触摸面板11的第一方向上所有节点受到第一干扰。
若在预设时间内，分析单元124检测到触摸区域中的节点对应的饱和信号在预设时间内的检测次数均大于第二阈值，且非触摸区域中的节点对应的饱和信号在预设时间内的检测次数均小于第二阈值，则分析单元124判定触摸区域中所有节点受到第二干扰。
请参阅图6，本申请提供一种电子设备100，电子设备100包括上述实施例中的触摸屏干扰检测系统10。
在一些实施方式中，电子设备100包括，但不限于，便携式或移动设备、手机、平板电脑、电视、个人数字助理、膝上型设备、台式机、手持PC、服务器、网络设备、图形设备、视频游戏设备、蜂窝电话、便携式媒体播放器、手持设备、可穿戴设备(例如，显示眼镜或护目镜、头戴式显示器、手表、头戴设备等)、虚拟现实和/或增强现实设备、物联网设备、工业控制设备、车载信息娱乐设备、流媒体客户端设备、电子书阅读设备、或者具有触摸屏幕，可以实现触控的其他电子设备。
本技术领域的普通技术人员应当认识到，以上的实施方式仅是用来说明本申请，而并非用作为对本申请的限定，只要在本申请的实质精神范围之内，对以上实施例所作的适当改变和变化都落在本申请要求保护的范围之内。

Claims (15)

  1. 一种触摸屏干扰检测方法，其特征在于，包括：
    扫描所述触摸屏上的至少一行或一列节点，生成每个节点对应的触摸信号；
    将每个节点对应的触摸信号对应转换为饱和信号；
    检测所述饱和信号，并根据所述饱和信号在预设时间内的检测次数判定所述触摸屏是否受到干扰。
  2. 如权利要求1所述的触摸屏干扰检测方法，其特征在于，还包括：
    若所述饱和信号在所述预设时间内的检测次数小于第一阈值，判定所述饱和信号对应的节点没有受到干扰。
  3. 如权利要求1所述的触摸屏干扰检测方法，其特征在于，所述方法还包括：
    所述触摸屏的第一方向上的所有节点对应的所述饱和信号在所述预设时间内的检测次数均大于第一阈值而小于第二阈值，判定所述触摸屏的第一方向上所有节点受到第一干扰，所述第一干扰为显示干扰。
  4. 如权利要求3所述的触摸屏干扰检测方法，其特征在于，还包括：
    根据所述触摸信号确定用户的触摸区域；
    所述触摸区域中的节点对应的所述饱和信号在预设时间内的检测次数均大于第二阈值，且非触摸区域中的节点对应的所述饱和信号在预设时间内的检测次数均小于第二阈值，则判定所述触摸区域中所有节点受到第二干扰，所述第二干扰为电源共模干扰。
  5. 如权利要求4所述的触摸屏干扰检测方法，其特征在于，所述触摸屏为自电容式触摸面板，所述触摸面板上设置触控电极，每个所述触控电极构成一个节点。
  6. 如权利要求4所述的触摸屏干扰检测方法，其特征在于，所述触摸屏为互电容式触摸面板或自互一体式触控面板，所述触摸面板第一方向和第二方向设置绝缘相交的触控电极，所述触控电极的绝缘相交处构成一个节点。
  7. 如权利要求5或6所述的触摸屏干扰检测方法，其特征在于，所述方法还包括：检测所述触控面板内所有节点的所述饱和信号，并根据所述饱和信号在预设时间内的检测次数判定所述触摸屏是否受到干扰。
  8. 如权利要求6所述的触摸屏干扰检测方法，其特征在于，所述触摸屏统计第一方向上节点对应的饱和信号在预设时间内的检测次数，具体是指第二方向上所有节点对应的饱和信号在预设时间内的检测次数总和或平均值。
  9. 如权利要求5所述的触摸屏干扰检测方法，其特征在于，所述触摸屏为自容式触摸面板或自互一体式触控面板，所述触摸屏检测随机一行节点、一列节点或一行加一列节点组合的任意一种方式，并根据所述节点的饱和信号在预设时间内的检测次数判定所述触摸屏是否受到干扰。
  10. 一种触控芯片，其特征在于，包括：
    扫描单元，用于扫描触摸屏上的至少一行或一列节点，生成每个节点对应的触摸信号；
    转换单元，电连接于所述扫描单元，所述转换单元用于将每个节点对应的触摸信号对应转换为饱和信号；
    分析单元，电连接于转换单元，所述分析单元用于检测所述饱和信号，并根据所述饱和 信号在预设时间内的检测次数判定所述触摸屏是否受到干扰。
  11. 如权利要求10所述的触控芯片，其特征在于，若所述分析单元检测到所述饱和信号在预设时间内的检测次数小于第一阈值，所述分析单元判定所述饱和信号对应的节点未受到干扰。
  12. 如权利要求10所述的触控芯片，其特征在于，若所述分析单元检测到所述触摸屏的第一方向上所有节点对应的所述饱和信号在预设时间内的检测次数均大于第一阈值而小于第二阈值，所述分析单元判定所述第一方向上所有节点受到第一干扰，所述第一干扰为显示干扰。
  13. 如权利要求10所述的触控芯片，其特征在于，还包括：
    计算单元，电连接于所述扫描单元，所述计算单元用于根据所述触摸信号确定用户的触摸区域；
    若所述分析单元检测到所述触摸区域中的节点对应的所述饱和信号在预设时间内的检测次数均大于第二阈值，且非触摸区域中的节点对应的所述饱和信号在预设时间内的检测次数均小于第二阈值，所述分析单元判定所述触摸区域中所有节点受到第二干扰，所述第二干扰为电源共模干扰。
  14. 如权利要求10所述的触控芯片，其特征在于，还包括：
    放大单元，电连接于所述扫描单元，所述放大单元用于接收触摸信号，并将触摸信号转换为电压信号；
    滤波单元，电连接于所述放大单元，所述滤波单元用于对所述电压信号进行滤波；
    模数转换单元，电连接于所述滤波单元，所述模数转换单元用于将滤波后的电压信号转换为饱和信号。
  15. 一种电子设备，其特征在于，所述电子设备包括如权利要求10-14任一项所述的触控芯片。
PCT/CN2023/107069 2022-07-14 2023-07-12 触摸屏干扰检测方法、触控芯片以及电子设备 WO2024012499A1 (zh)

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