CN111078039A - Capacitive touch screen anti-interference method and device, touch screen equipment and storage medium - Google Patents
Capacitive touch screen anti-interference method and device, touch screen equipment and storage medium Download PDFInfo
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Abstract
The invention discloses an anti-interference method and device for a capacitive touch screen, touch screen equipment and a storage medium. The specific method comprises two basic links: whether the frequency of the environmental interference signal is close to the frequency of the compared driving signal according to a set standard is detected, and if the frequency of the environmental interference signal is close to the frequency of the compared driving signal, whether the amplitude of the environmental interference signal exceeds a preset threshold value is further judged. The driving signal with strong anti-interference capability is selected in the mode, so that the influence of external interference signals is reduced as much as possible, and the adaptability of the capacitive touch screen is improved.
Description
Technical Field
The invention relates to the technical field of capacitive touch sensors, in particular to an anti-interference method and device for a capacitive touch screen, touch screen equipment and a storage medium.
Background
Capacitive touch sensors generally include a substrate, and patterned X and Y electrodes disposed on the substrate, the X and Y electrodes being interdigitated to form a detection grid. When a conductor or finger touches the projected capacitive panel, which results in a decrease in mutual capacitance but an increase in capacitance, the touched position can be detected by detecting this change. This detection is achieved by the control board transmitting a signal on the TX side (drive electrode) and processing the weak signal detected on the RX side (receive electrode). However, the frequency of the signal transmitted by the existing control board at the TX side is fixed, so that the interference caused by the interference source in the same frequency band due to different installation or application scenes in the surrounding environment cannot be solved, and further, the useful signal cannot be effectively identified.
Disclosure of Invention
The invention mainly aims to provide an anti-interference method for a capacitive touch screen, and aims to solve the technical problems that the existing capacitive touch screen cannot flexibly adapt to environmental interference and further has poor signal identification reliability.
In order to achieve the above object, the anti-interference method for capacitive touch screen provided by the present invention comprises: step 100: on the premise that the touch control transmitting electrode has no input, receiving a detection signal from the touch control receiving electrode;
step 120: judging whether the frequency of the detection signal is close to the frequency of one of a plurality of preset driving signals according to a set standard, wherein the transmitting frequencies of the driving signals are different;
step 140: if not, fixing the currently compared driving signal as a working driving signal of the touch control sending electrode;
step 160: if so, judging whether the amplitude of the detection signal exceeds a preset threshold value;
step 180: if the judgment result in the step 160 is negative, fixing the currently compared driving signal as the working driving signal of the touch control transmitting electrode;
step 200: if the determination result in step 160 is yes, marking the currently compared driving signal as the interfered driving signal;
step 220: judging whether all the driving signals for comparison are marked as interfered driving signals;
step 240: if the determination result in the step 220 is negative, switching the compared driving signal to other driving signals which are not marked and skipping to the step 120;
step 260: if the determination result in the step 220 is yes, any one of the preset driving signals is used as the working driving signal of the touch transmitting electrode.
Preferably, between the step 240 and the step 260, further comprising:
step 251: if the judgment result in the step 220 is yes, performing round training counting and eliminating the interfered marks of each driving signal;
step 252: judging whether the round training count is less than a preset number of times;
the step 260 specifically includes, if the determination result in the step 252 is negative, taking any one of the preset driving signals as the working driving signal of the touch transmitting electrode.
The step 120 specifically includes, if the determination result in the step 252 is yes, determining whether the frequency of the detection signal is close to the frequency of one of the preset driving signals according to a predetermined criterion, where the transmission frequencies of the driving signals are different.
Preferably, the step 100 specifically includes: and receiving a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input and no touch operation.
Preferably, the step 100 specifically includes: under the premise that the touch transmitting electrode has no input and no touch operation, the chip receives a detection signal from the touch receiving electrode by using an internal clock.
Preferably, the preset threshold of step 160 is 40 db.
The invention also provides an anti-interference device of the capacitive touch screen, which comprises: the receiving module is used for receiving a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input;
the frequency comparison module is used for judging whether the frequency of the detection signal is close to the frequency of one of a plurality of preset driving signals according to a set standard, and the transmitting frequencies of the driving signals are different;
the setting module is used for fixing the currently compared driving signal as a working driving signal of the touch control sending electrode when the judgment result of the frequency comparison module is negative;
the amplitude comparison module is used for judging whether the amplitude of the detection signal exceeds a preset threshold value or not when the judgment result of the frequency comparison module is negative;
the setting module is also used for fixing the currently compared driving signal as a working driving signal of the touch control sending electrode when the judgment result of the amplitude comparison module is negative;
the marking module is used for marking the currently compared driving signal as an interfered driving signal when the judgment result of the amplitude comparison module is yes;
the statistic judgment module is used for judging whether all the driving signals for comparison are marked as interfered signal attributes or not;
the switching module is used for switching the compared driving signals to other driving signals which are not marked when the judgment result of the statistical judgment module is negative;
the frequency comparison module is also used for judging whether the frequency of the detection signal is close to the frequency of the currently compared driving signal according to a set standard after the switching of the switching module is finished;
the setting module is further configured to select one of the preset driving signals as a working driving signal of the touch transmitting electrode when the judgment result of the statistical judgment module is yes.
Preferably, the capacitive touch screen interference rejection device further comprises:
the round training counting module is used for carrying out round training counting and eliminating the interfered marks of all the driving signals when the judgment result of the statistical judgment module is yes;
the round training judging module is also used for judging whether the round training count is less than a preset number of times;
the setting module is further used for selecting one of the preset driving signals as a working driving signal of the touch control sending electrode when the judgment result of the training judgment module is negative;
the frequency comparison module is further configured to determine, according to a predetermined criterion, whether the frequency of the detection signal is close to the frequency of one of the preset driving signals when the result of the training determination module is yes, where the transmission frequencies of the driving signals are different.
Preferably, the receiving module is specifically configured to receive the detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input and no touch operation; or the like, or, alternatively,
the receiving module is specifically used for receiving a detection signal from the touch receiving electrode by the chip through an internal clock on the premise that the touch transmitting electrode has no input and no touch operation.
The invention also proposes a device with a capacitive touch screen, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which when executing said program implements the method as described above.
The invention also proposes a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method as described above.
The capacitive touch screen anti-interference method is characterized in that a plurality of driving signals are preset for comparison and selection as working driving signals for driving the transmitting electrode, and the transmitting frequencies of the driving signals are different. The specific method comprises two basic links: whether the frequency of the environmental interference signal is close to the frequency of the compared driving signal or not is detected, and whether the amplitude of the environmental interference signal exceeds a preset threshold or not is further judged if the frequency of the environmental interference signal is close to the frequency of the compared driving signal. The driving signal with strong anti-interference capability is selected in the mode, so that the influence of external interference signals is reduced as much as possible, and the adaptability of the capacitive touch screen is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flowchart of a capacitive touch screen anti-interference method according to a first embodiment of the present invention;
FIG. 2 is a schematic flowchart illustrating a capacitive touch screen anti-interference method according to a second embodiment of the present invention;
FIG. 3 is a schematic flowchart illustrating an anti-interference method for a capacitive touch screen according to a third embodiment of the present invention;
FIG. 4 is a schematic flowchart illustrating an anti-interference method for a capacitive touch screen according to a fourth embodiment of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an anti-interference method for a capacitive touch screen.
To achieve the above object, referring to fig. 1, an anti-interference method for a capacitive touch screen according to the present invention includes:
step 100: on the premise that the touch control transmitting electrode has no input, receiving a detection signal from the touch control receiving electrode;
step 120: judging whether the frequency of the detection signal is close to the frequency of one of a plurality of preset driving signals according to a set standard, wherein the transmitting frequencies of the driving signals are different;
the hardware upper driving chip of the capacitive touch screen determines the signal attribute of the driving signal, and in order to form the driving signals with different signal attributes, a plurality of independent driving chips can be set for switching use, and the driving chips can be subjected to adaptive burning when the signal attributes need to be changed. Therefore, when the capacitive touch screen adapts to external environment interference signals, the driving signals of the capacitive touch screen can realize frequency hopping.
And judging whether the frequency of the detection signal is close to the frequency of the comparison driving signal or not according to a set standard, wherein the set standard depends on the size of the capacitive touch screen and the internal hardware tolerance, and preferably the set standard is plus or minus 5% of the frequency of the driving signal.
Assuming that f (n) represents the transmission frequency adopted by different signal attributes, and n corresponds to the signal attribute ordinal number, for example, the transmission frequency adopted by the first signal attribute is f (n), the driving signal can be sent by default by using one of the signal attributes. As an example, three signal attributes are preset, namely a first signal attribute, a second signal attribute and a third signal attribute, and the emission frequencies of the corresponding signal attributes can be set to f1 ═ 80k (hz), f2 ═ 70k (hz), and f3 ═ 60k (hz), respectively. If the predetermined criterion is within 5%, the frequency of the detection signal is considered to be close to the frequency of the comparison driving signal when the frequency of the detection signal is within the range of [ f 1-5%, f2+ 5% ], otherwise, the frequency of the detection signal is considered to be not close.
In order to better understand the technical scheme of the invention, a common mutual capacitance detection method is described below.
In brief, 2 sensors for sending and receiving signals are used to detect the reduction degree of the capacitance on the signal receiving side when the finger touches.
A mutual capacitance detection scheme is to measure the change in mutual capacitance of a row and a column. If the mutual capacitance between the X electrode and the Y electrode is reduced after the finger touches, the change of the mutual capacitance is detected, and whether the finger touches or not can be detected.
Mutual capacitance detection methods have transmit and receive electrodes arranged in an orthogonal matrix, which is the only way a projected capacitive touch screen reliably reports and tracks two or more concurrent touch points. In a mutual capacitance detection scheme, the drive lines and the detection lines are in different directions, and if a drive voltage is applied in the X direction, signal detection is performed in the Y direction, and vice versa.
In this detection method, transmitting a drive signal to the touch transmission electrode means transmitting a drive signal to each drive electrode one by one in a scanning manner.
In this embodiment, in order to reduce the degree of signal mixing, the touch driving electrode is controlled to have no input, and the signal received at the driving receiving electrode mainly comes from the interference source LCD (liquid crystal display)/power supply of the whole device itself, and the external interference source (such as a fluorescent lamp, a high-power transmitter, etc.) overlaps the interference Noise.
Step 140: if not, fixing the currently compared driving signal as a working driving signal of the touch control sending electrode;
if the frequency of the received or sampled detection signal is not close to the compared driving signal, it means that the difference between the frequency of the environmental interference signal and the frequency of the driving signal is large, so that the influence of the environmental interference signal can be ignored, and the currently compared driving signal is directly used as the working driving signal of the touch transmitting electrode.
Step 160: if so, judging whether the amplitude of the detection signal exceeds a preset threshold value;
when the amplitude of the detection signal is determined, a zero amplitude may be referred to, for example, under a non-touch condition, if the amplitude of the detection signal is 1V, the exceeding value is also equal to 1V, and if the preset threshold is 0.5V, the amplitude of the detection signal may be determined to exceed the preset threshold. In a preferred implementation, the predetermined threshold is-40 dB, i.e. 20LgVnoise/V1 is-40.
Step 180: if the judgment result in the step 160 is negative, fixing the currently compared driving signal as the working driving signal of the touch control transmitting electrode;
if not, the strength of the interference signal is within an acceptable range, and normal signal identification cannot be influenced, so that the driving signal with the current comparison function can be fixed to serve as a working driving signal of the capacitive touch screen.
Step 200: if the determination result in step 160 is yes, marking the currently compared driving signal as the interfered driving signal;
it will be appreciated that in performing step S200, it is not possible to determine whether all reference frequencies have been compared, and therefore the disturbed drive signal at the mark facilitates subsequent statistical determinations as to whether a round has been completed.
Step 220: judging whether all the driving signals for comparison are marked as interfered driving signals;
step 240: if the determination result in the step 220 is negative, switching the compared driving signal to other driving signals which are not marked and skipping to the step 120;
if the round of training is not completed once, it indicates that there is a possibility that strong environmental interference resistance exists in other alternative driving signals, so it is necessary to compare the remaining driving signals one by one to screen out the driving signals that can meet the requirements.
Step 260: if the determination result in the step 220 is yes, any one of the preset driving signals is used as the working driving signal of the touch transmitting electrode.
If the round of training is completed, all the driving signals are marked as interfered driving signals. In order to ensure the normal operation of the capacitive touch screen, an optional one of a plurality of preset driving signals is required to be used as an operation driving signal of the touch transmitting electrode.
The capacitive touch screen anti-interference method is characterized in that a plurality of driving signals are preset for comparison and selection as working driving signals for driving the transmitting electrode, and the transmitting frequencies of the driving signals are different. The specific method comprises two basic links: whether the frequency of the environmental interference signal is close to the frequency of the compared driving signal or not is detected, and whether the amplitude of the environmental interference signal exceeds a preset threshold or not is further judged if the frequency of the environmental interference signal is close to the frequency of the compared driving signal. The driving signal with strong anti-interference capability is selected in the mode, so that the influence of external interference signals is reduced as much as possible, and the adaptability of the capacitive touch screen is improved.
Further, referring to fig. 2, in a second embodiment of the capacitive touch screen anti-interference method,
between the step 240 and the step 260, further comprising:
step 251: if the judgment result in the step 220 is yes, performing round training counting and eliminating the interfered marks of each driving signal;
step 252: judging whether the round training count is less than a preset number of times;
the step 260 specifically includes, if the determination result in the step 252 is negative, taking any one of the preset driving signals as the working driving signal of the touch transmitting electrode.
The step 120 specifically includes, if the determination result in the step 252 is yes, determining whether the frequency of the detection signal is close to the frequency of one of the preset driving signals according to a predetermined criterion, where the transmission frequencies of the driving signals are different.
In this embodiment, through the step of setting cyclic training, the driving signal marked as interfered by the detection error in a single round of training can be selected as the working driving signal of the touch driving electrode, so as to improve the reliability of screening. Preferably the number of rounds is more than 3.
Further, referring to fig. 3, in a third embodiment of the capacitive touch screen anti-interference method,
the step 100 specifically includes: and receiving a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input and no touch operation. Under the non-touch operation, the change of the electric signal network is relatively simple, and the influence of the external interference signal on each preset driving signal can be accurately evaluated.
Further, referring to fig. 4, in a fourth embodiment of the capacitive touch screen anti-interference method, the method is implemented
The step 100 specifically includes: under the premise that the touch transmitting electrode has no input and no touch operation, the chip receives a detection signal from the touch receiving electrode by using an internal clock. Because the external interference signal intensity is relatively weak and the frequency is uncertain, the sampling precision of the detection signal can be improved by the internal clock of the chip.
Further, the preset threshold of step 160 is 40 db. Thus, the detection method can be well adapted to capacitive touch screens over 50 inches, such as capacitive touch screens of 55 inches, 60 inches, 65 inches, 70 inches, 75 inches, and 86 inches.
The invention also provides an anti-interference device of the capacitive touch screen, which comprises:
the receiving module is used for receiving a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input;
the frequency comparison module is used for judging whether the frequency of the detection signal is close to the frequency of one of a plurality of preset driving signals according to a set standard, and the transmitting frequencies of the driving signals are different;
the setting module is used for fixing the currently compared driving signal as a working driving signal of the touch control sending electrode when the judgment result of the frequency comparison module is negative;
the amplitude comparison module is used for judging whether the amplitude of the detection signal exceeds a preset threshold value or not when the judgment result of the frequency comparison module is negative;
the setting module is also used for fixing the currently compared driving signal as a working driving signal of the touch control sending electrode when the judgment result of the amplitude comparison module is negative;
the marking module is used for marking the currently compared driving signal as an interfered driving signal when the judgment result of the amplitude comparison module is yes;
the statistic judgment module is used for judging whether all the driving signals for comparison are marked as interfered signal attributes or not;
the switching module is used for switching the compared driving signals to other driving signals which are not marked when the judgment result of the statistical judgment module is negative;
the frequency comparison module is also used for judging whether the frequency of the detection signal is close to the frequency of the currently compared driving signal according to a set standard after the switching of the switching module is finished;
the setting module is further configured to select one of the preset driving signals as a working driving signal of the touch transmitting electrode when the judgment result of the statistical judgment module is yes.
In this embodiment, the receiving module is generally embodied in the form of a chip, and in order to implement frequency modulation of the driving signal, a plurality of independent driving chips may be set for switching use, or the driving chips may be adaptively programmed when signal attributes need to be changed.
Assuming that f (n) represents the transmission frequency adopted by different signal attributes, and n corresponds to the signal attribute ordinal number, for example, the transmission frequency adopted by the first signal attribute is f (n), the driving signal can be sent by default by using one of the signal attributes. As an example, three signal attributes are preset, namely a first signal attribute, a second signal attribute and a third signal attribute, and the emission frequencies of the corresponding signal attributes can be set to f1 ═ 80k (hz), f2 ═ 70k (hz), and f3 ═ 60k (hz), respectively.
In this embodiment, in order to reduce the degree of signal mixing, the touch driving electrode is controlled to have no input, and the signal received at the driving receiving electrode mainly comes from the interference source LCD (liquid crystal display)/power supply of the whole device itself, and the external interference source (such as a fluorescent lamp, a high-power transmitter, etc.) overlaps the interference Noise.
If the frequency of the received or sampled detection signal is not close to the compared driving signal, it means that the difference between the frequency of the environmental interference signal and the frequency of the driving signal is large, so that the influence of the environmental interference signal can be ignored, and the currently compared driving signal is directly used as the working driving signal of the touch transmitting electrode.
When the amplitude of the detection signal is determined, a zero amplitude may be referred to, for example, under a non-touch condition, if the amplitude of the detection signal is 1V, the exceeding value is also equal to 1V, and if the preset threshold is 0.5V, the amplitude of the detection signal may be determined to exceed the preset threshold. In a preferred implementation, the predetermined threshold is-40 dB, i.e. 20LgVnoise/V1 is-40.
If the amplitude of the detection signal received by the amplitude detection module does not exceed the preset threshold, it indicates that the intensity of the interference signal is within an acceptable range, and normal signal identification is not affected, so that the driving signal with the current comparison function can be fixed to serve as a working driving signal of the capacitive touch screen.
The marking module is used for distinguishing the compared driving signals from the driving signals which are not compared, and can conveniently and quickly complete the round training through marking to screen out proper driving signals.
If the round of training is not completed once, it indicates that there is a possibility that strong environmental interference resistance exists in other alternative driving signals, so it is necessary to compare the remaining driving signals one by one to screen out the driving signals that can meet the requirements.
If the round of training is completed, all the driving signals are marked as interfered driving signals. In order to ensure the normal operation of the capacitive touch screen, an optional one of a plurality of preset driving signals is required to be used as an operation driving signal of the touch transmitting electrode.
Further, this capacitive touch screen anti jamming unit still includes:
the round training counting module is used for carrying out round training counting and eliminating the interfered marks of all the driving signals when the judgment result of the statistical judgment module is yes;
the round training judging module is also used for judging whether the round training count is less than a preset number of times;
the setting module is further used for selecting one of the preset driving signals as a working driving signal of the touch control sending electrode when the judgment result of the training judgment module is negative;
the frequency comparison module is further configured to determine, according to a predetermined criterion, whether the frequency of the detection signal is close to the frequency of one of the preset driving signals when the result of the training determination module is yes, where the transmission frequencies of the driving signals are different.
In this embodiment, through setting up the round and train count module and the round and train judge module, so can select the drive signal who is regarded as touch-control drive utmost point because of detection error is marked as the drive signal who receives the interference in single round training to promote the reliability of screening. Preferably the number of rounds is more than 3.
Further, the receiving module is specifically configured to receive a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input and no touch operation; or the like, or, alternatively,
the receiving module is specifically used for receiving a detection signal from the touch receiving electrode by the chip through an internal clock on the premise that the touch transmitting electrode has no input and no touch operation.
Under the non-touch operation, the change of the electric signal network is relatively simple, and the influence of the external interference signal on each preset driving signal can be accurately evaluated. Because the external interference signal intensity is relatively weak and the frequency is uncertain, the sampling precision of the detection signal can be improved by the internal clock of the chip.
The invention also proposes a device with a capacitive touch screen, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which when executing said program implements the method as described above.
In this embodiment, the device with the capacitive touch screen may have a display screen or may be an independent input device. As an example, a device with a capacitive touch screen may be an interactive whiteboard, a tablet computer, or the like.
The invention also proposes a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method as described above.
In this embodiment, the computer-readable storage medium may take any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing.
More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof.
A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An anti-interference method for a capacitive touch screen is characterized by comprising the following steps:
step 100: on the premise that the touch control transmitting electrode has no input, receiving a detection signal from the touch control receiving electrode;
step 120: judging whether the frequency of the detection signal is close to the frequency of one of a plurality of preset driving signals according to a set standard, wherein the transmitting frequencies of the driving signals are different;
step 140: if not, fixing the currently compared driving signal as a working driving signal of the touch control sending electrode;
step 160: if so, judging whether the amplitude of the detection signal exceeds a preset threshold value;
step 180: if the judgment result in the step 160 is negative, fixing the currently compared driving signal as the working driving signal of the touch control transmitting electrode;
step 200: if the determination result in step 160 is yes, marking the currently compared driving signal as the interfered driving signal;
step 220: judging whether all the driving signals for comparison are marked as interfered driving signals;
step 240: if the determination result in the step 220 is negative, switching the compared driving signal to other driving signals which are not marked and skipping to the step 120;
step 260: if the determination result in the step 220 is yes, any one of the preset driving signals is used as the working driving signal of the touch transmitting electrode.
2. The capacitive touch screen immunity method of claim 1,
between the step 240 and the step 260, further comprising:
step 251: if the judgment result in the step 220 is yes, performing round training counting and eliminating the interfered marks of each driving signal;
step 252: judging whether the round training count is less than a preset number of times;
the step 260 specifically includes, if the determination result in the step 252 is negative, taking any one of the preset driving signals as the working driving signal of the touch transmitting electrode.
The step 120 specifically includes, if the determination result in the step 252 is yes, determining whether the frequency of the detection signal is close to the frequency of one of the preset driving signals according to a predetermined criterion, where the transmission frequencies of the driving signals are different.
3. The capacitive touch screen interference rejection method according to claim 1 or 2,
the step 100 specifically includes: and receiving a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input and no touch operation.
4. The capacitive touch screen interference rejection method according to claim 1 or 2,
the step 100 specifically includes: under the premise that the touch transmitting electrode has no input and no touch operation, the chip receives a detection signal from the touch receiving electrode by using an internal clock.
5. The capacitive touch screen interference rejection method according to claim 4, wherein said preset threshold of step 160 is 40 db.
6. An anti-jamming device for a capacitive touch screen, comprising:
the receiving module is used for receiving a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input;
the frequency comparison module is used for judging whether the frequency of the detection signal is close to the frequency of one of a plurality of preset driving signals according to a set standard, and the transmitting frequencies of the driving signals are different;
the setting module is used for fixing the currently compared driving signal as a working driving signal of the touch control sending electrode when the judgment result of the frequency comparison module is negative;
the amplitude comparison module is used for judging whether the amplitude of the detection signal exceeds a preset threshold value or not when the judgment result of the frequency comparison module is negative;
the setting module is also used for fixing the currently compared driving signal as a working driving signal of the touch control sending electrode when the judgment result of the amplitude comparison module is negative;
the marking module is used for marking the currently compared driving signal as an interfered driving signal when the judgment result of the amplitude comparison module is yes;
the statistic judgment module is used for judging whether all the driving signals for comparison are marked as interfered signal attributes or not;
the switching module is used for switching the compared driving signals to other driving signals which are not marked when the judgment result of the statistical judgment module is negative;
the frequency comparison module is also used for judging whether the frequency of the detection signal is close to the frequency of the currently compared driving signal according to a set standard after the switching of the switching module is finished;
the setting module is further configured to select one of the preset driving signals as a working driving signal of the touch transmitting electrode when the judgment result of the statistical judgment module is yes.
7. The capacitive touch screen tamper resistant device of claim 6, further comprising:
the round training counting module is used for carrying out round training counting and eliminating the interfered marks of all the driving signals when the judgment result of the statistical judgment module is yes;
the round training judging module is also used for judging whether the round training count is less than a preset number of times;
the setting module is further used for selecting one of the preset driving signals as a working driving signal of the touch control sending electrode when the judgment result of the training judgment module is negative;
the frequency comparison module is further configured to determine, according to a predetermined criterion, whether the frequency of the detection signal is close to the frequency of one of the preset driving signals when the result of the training determination module is yes, where the transmission frequencies of the driving signals are different.
8. The capacitive touch screen immunity device of claim 6 or 7,
the receiving module is specifically used for receiving a detection signal from the touch receiving electrode on the premise that the touch transmitting electrode has no input and no touch operation; or the like, or, alternatively,
the receiving module is specifically used for receiving a detection signal from the touch receiving electrode by the chip through an internal clock on the premise that the touch transmitting electrode has no input and no touch operation.
9. Device with a capacitive touch screen, characterized in that it comprises a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, implements the method according to any one of claims 1-5.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-5.
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| CN201811215396.6A CN111078039A (en) | 2018-10-18 | 2018-10-18 | Capacitive touch screen anti-interference method and device, touch screen equipment and storage medium |
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| CN201811215396.6A CN111078039A (en) | 2018-10-18 | 2018-10-18 | Capacitive touch screen anti-interference method and device, touch screen equipment and storage medium |
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| CN112363639A (en) * | 2020-11-11 | 2021-02-12 | 青岛海信商用显示股份有限公司 | Intelligent device and control method thereof |
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| CN107908314A (en) * | 2017-12-04 | 2018-04-13 | 广州视源电子科技股份有限公司 | Capacitive screen touch detection method and device, touch equipment and storage medium |
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| CN102053764A (en) * | 2009-11-10 | 2011-05-11 | 深圳市汇顶科技有限公司 | Anti-interference method and system as well as capacitive touch sensor |
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