CN109791448B - Touch detection method and touch chip - Google Patents
Touch detection method and touch chip Download PDFInfo
- Publication number
- CN109791448B CN109791448B CN201780000761.9A CN201780000761A CN109791448B CN 109791448 B CN109791448 B CN 109791448B CN 201780000761 A CN201780000761 A CN 201780000761A CN 109791448 B CN109791448 B CN 109791448B
- Authority
- CN
- China
- Prior art keywords
- touch
- value set
- reference value
- frequency
- target frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- User Interface Of Digital Computer (AREA)
- Position Input By Displaying (AREA)
Abstract
A touch detection method and a touch chip are provided. The touch detection method comprises the following steps: determining that a driving signal of the touch screen hops from a current frequency to a target frequency (S510); driving the touch screen with a driving signal of a reference frequency, wherein the reference frequency is different from a target frequency (S520); collecting a set of raw values of the touch screen working at a reference frequency as a first set of raw values (S530); determining a first touch position where a touch exists on the touch screen according to the first original value set and the backup reference value set of the reference frequency (S540); driving the touch screen with a driving signal of a target frequency (S550); collecting a set of raw values of the touch screen working at a target frequency as a second set of raw values (S560); determining a set of reference values for the target frequency from the second set of raw values and the first touch location (S570); from the set of reference values for the target frequency, a touch location of the touch screen when operating at the target frequency is determined (S580). The touch detection method and the touch control chip are beneficial to improving the detection accuracy of the touch position on the touch screen.
Description
Technical Field
The present disclosure relates to the field of electronic devices, and in particular, to a touch detection method and a touch chip.
Background
The capacitive touch screen is a man-machine interaction device and mainly comprises a driving electrode and an induction electrode. The driving electrode can output driving signals with different frequencies according to set parameters, and the induction electrode is responsible for receiving induction signals.
The touch chip performs digital signal processing and other operations on the signals received by the sensing electrodes to obtain original values. When a finger touches the capacitive touch screen, the original value acquired by the touch chip is reduced, compared with the original value acquired by the touch chip from the induction electrode when no finger touches the capacitive touch screen.
When no finger touches the capacitive touch screen, the original value collected by the touch chip from the sensing electrode can be used as a reference. The original value collected from the sensing electrode by the touch chip when the capacitive touch screen is touched by a finger is subtracted from the reference, so that the difference of the original values, namely the magnitude of the variation of the original values caused by the touch, can be obtained. The touch chip can determine the coordinates of the finger touch points on the capacitive touch screen according to the difference value to obtain information such as specific touch positions of fingers.
During use, noise, such as ambient noise, common mode noise, electromagnetic noise, and the like, is inevitably present. The noise may increase or decrease the original value, so that the difference between the original values may increase or decrease, and further, a situation may occur where no finger touches the capacitive touch screen but the touch chip mistakenly considers that there is a touch, or a situation where a finger touches the capacitive touch screen but the touch chip mistakenly considers that there is no touch or a plurality of touch points are mistakenly considered.
An effective solution to reduce noise versus touch conditions on a capacitive touch screen for a touch chip is frequency hopping. Specifically, the frequency of the drive signal for driving the electrodes is changed.
When the driving electrodes input driving signals with different frequencies, the original values obtained by the touch chip according to the sensing signals output by the sensing electrodes are different. For example, the higher the frequency of the driving signal input by the driving electrode is, the larger the original value obtained by the touch chip according to the sensing signal output by the sensing electrode is. Therefore, when the driving electrodes input driving signals with different frequencies, the touch chip should determine the touch position on the capacitive touch screen according to different references.
In the existing frequency hopping process, an original value obtained by the touch control chip according to an induction signal output by the induction electrode after frequency hopping is directly used as a reference. This approach may result in a less accurate determination of the touch location on the capacitive touch screen.
Disclosure of Invention
The application provides a touch detection method and a touch chip, which are beneficial to improving the detection accuracy of a touch position on a touch screen.
In a first aspect, the present application provides a touch detection method. The touch detection method comprises the following steps: determining that a driving signal of the touch screen hops from a current frequency to a target frequency; driving the touch screen by a driving signal with a reference frequency, wherein the reference frequency is different from a target frequency; collecting a raw value set of a touch screen working at a reference frequency as a first raw value set; determining a first touch position where touch exists on the touch screen according to the first original value set and the backup reference value set of the reference frequency; driving the touch screen by a driving signal of a target frequency; collecting a raw value set of the touch screen working at a target frequency as a second raw value set; determining a set of reference values of the target frequency from the second set of raw values and the first touch position; and determining the touch position of the touch screen working at the target frequency according to the reference value set of the target frequency.
In the implementation mode, a first touch position on the touch screen is determined according to a first original value set corresponding to a reference frequency and a backup reference value set of the reference frequency, and then a reference value set of a target frequency is determined according to a second original value set corresponding to the target frequency and the first touch position, so that when a touch exists in the process that the touch screen hops from the current frequency to the target frequency, the influence of the touch on the reference value set of the target frequency is reduced, and the detection accuracy of the touch position on the touch screen is improved.
With reference to the first aspect, in a first possible implementation manner, determining a first touch position where a touch exists on a touch screen according to a first original value set and a backup reference value set of a reference frequency includes: fitting the backup reference value set and the first original value set according to a first function to obtain a undetermined coefficient in the first function; obtaining a fitting reference value set according to the backup reference value set, the coefficient to be determined and the first function; a first touch location is determined from the set of fitted reference values and the first set of raw values.
In the implementation mode, the backup reference value set and the first original value set of the reference frequency are fitted, the fitting reference value set is obtained according to the backup reference value set and the function obtained through fitting, and then the first touch position is determined according to the fitting reference value set and the first original value set, so that the influence of factors such as temperature and noise on the first touch position can be eliminated, and the detection accuracy of the touch position on the touch screen can be further improved.
With reference to the first possible implementation manner, in a second possible implementation manner, the first function is a linear function, and the fitting is a least square fitting.
With reference to the first aspect, the first possible implementation manner, or the second possible implementation manner, in a third possible implementation manner, the determining, according to the second raw value set and the first touch position, a reference value set of the target frequency includes: and determining a reference value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency.
In the implementation mode, the reference value corresponding to the first touch position in the reference value set of the target frequency is determined according to the reference value set of the current frequency, so that the detection accuracy rate for determining the touch position on the touch screen can be further improved.
With reference to the third possible implementation manner, in a fourth possible implementation manner, determining an original value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency includes:
calculating the average value of all the original values in the second original value set as a first average value;
calculating the average value of all reference values in the reference value set of the current frequency as a second average value;
And adding the first average value to a first reference value in the reference value set of the current frequency, and subtracting a second average value to obtain a numerical value which is taken as a second reference value in the reference value set of the target frequency, wherein the first reference value and the second reference value are both values corresponding to the first touch position, and the position of the first reference value in the reference value set of the current frequency is the same as the position of the second reference value in the reference value set of the target frequency.
With reference to the first aspect or any one of the first to the fourth possible implementation manners, in a fifth possible implementation manner, the touch detection method further includes: taking the original value set acquired when the touch screen works at the target frequency and is not touched on the touch screen as a third original value set; and taking a first original value in the third original value set as a second reference value in the reference value set of the target frequency, wherein the first original value is an original value in the third original value set corresponding to the first touch position, and the position of the first original value in the third original value set is the same as that of the second reference value in the reference value set of the target frequency.
In the implementation mode, the touch position on the touch screen when the touch screen works at the target frequency can be determined according to the updated reference value set of the target frequency, so that the detection accuracy of the touch position on the touch screen is improved.
In a second aspect, the present application provides a touch chip. The touch chip comprises a memory, a Microprocessor Controller (MCU), a driving circuit and a sensing circuit, wherein the MCU comprises a processor and a conversion circuit.
The memory is used for storing computer program codes, reference frequencies, backup reference value sets of the reference frequencies, original value sets acquired dynamically, reference value sets generated dynamically and the like.
The processor is used for executing the computer program codes stored in the memory and controlling the driving circuit to output driving signals of corresponding frequencies to the touch screen so as to drive the touch screen to work, generate a reference value set, and detect touch positions and the like according to the original value set, the reference value set and the backup reference value set.
The conversion circuit is used for generating a raw value set according to the sensing signals collected by the sensing circuit from the touch screen.
The driving circuit is used for outputting a driving signal with corresponding frequency to the touch screen under the control of the processor.
The sensing circuit is used for collecting sensing signals output by the touch screen under the control of the processor.
Specifically, the processor is configured to determine that a drive signal of the touch screen hops from a current frequency to a target frequency.
The driving circuit is used for driving the touch screen by a driving signal with a reference frequency.
The conversion circuit is used for generating an original value set as a first original value set according to an induction signal acquired by the induction circuit when the touch screen works at a reference frequency, wherein the reference frequency is different from the target frequency.
The processor is used for determining a first touch position where touch exists on the touch screen according to the backup reference value set of the reference frequency and the first original value set acquired by the conversion circuit.
The driving circuit is also used for driving the touch screen by a driving signal with a target frequency.
The conversion circuit is also used for generating a raw value set as a second raw value set according to the induction signal acquired by the induction circuit when the touch screen works at the target frequency.
The processor is further configured to determine a set of reference values for the target frequency based on the set of second raw values generated by the conversion circuit and the first touch location determined by the processor.
The processor is further configured to determine a touch location of the touch screen operating at the target frequency based on the set of reference values for the target frequency.
According to the touch chip in the embodiment of the application, the first touch position on the touch screen is determined according to the first original value set and the backup reference value set corresponding to the reference frequency, and then the reference value set of the target frequency is determined according to the second original value set and the first touch position corresponding to the target frequency, so that when a touch exists in the process that a driving signal of the touch screen hops from the current frequency to the target frequency, the influence of the touch on the reference value set of the target frequency is reduced, and the touch detection accuracy of the touch screen is improved.
With reference to the second aspect, in a first possible implementation manner, the processor is specifically configured to:
fitting the backup reference value set and the first original value set according to a first function to obtain a undetermined coefficient in the first function;
obtaining a fitting reference value set according to the backup reference value set, the coefficient to be determined and the first function;
a first touch location is determined from the set of fitted reference values and the first set of raw values.
With reference to the first possible implementation manner, in a second possible implementation manner, the first function is a linear function, and the fitting is a least square fitting.
With reference to the second aspect, the first possible implementation manner, or the second possible implementation manner, in a third possible implementation manner, the processor is specifically configured to determine, according to the second original value set and the reference value set of the current frequency, a reference value corresponding to the first touch position in the reference value set of the target frequency.
With reference to the third possible implementation manner, in a fourth possible implementation manner, the processor is specifically configured to:
calculating the average value of all the original values in the second original value set as a first average value;
calculating the average value of all reference values in the reference value set of the current frequency as a second average value;
And adding the first average value to a first reference value in the reference value set of the current frequency, and subtracting a second average value to obtain a numerical value which is taken as a second reference value in the reference value set of the target frequency, wherein the first reference value and the second reference value are both values corresponding to the first touch position, and the position of the first reference value in the reference value set of the current frequency is the same as the position of the second reference value in the reference value set of the target frequency.
With reference to the second aspect or any one of the possible implementation manners of the second aspect, in a fifth possible implementation manner, the conversion circuit is further configured to use the set of raw values collected when the touch screen operates at the target frequency and there is no touch on the touch screen as a third set of raw values.
Accordingly, the processor is further configured to use a first original value of the third set of original values as the second reference value of the set of reference values of the target frequency, the first original value being an original value of the third set of original values corresponding to the first touch position, the position of the first original value in the third set of original values being the same as the position of the third reference value in the set of reference values of the target frequency.
In one possible design, the touch chip provided in the present application may include a module, which may be software and/or hardware, for performing the touch detection method in the first aspect or any one of the possible implementations of the first aspect.
Yet another aspect of the present application provides a computer-readable storage medium, which stores instructions that, when executed on a touch chip, cause the touch chip to perform the touch detection method in the first aspect or any one of the possible implementation manners in the first aspect.
A further aspect of the present application provides a computer program product containing instructions that, when run on a touch chip, cause the touch chip to perform the method of the first aspect or any one of the possible implementations of the first aspect.
Drawings
Fig. 1 is a diagram illustrating a system of a capacitive touch screen and a touch chip according to an embodiment of the present application.
FIG. 2 is a diagram illustrating an example set of reference values according to an embodiment of the present application.
FIG. 3 is a diagram of an example set of original values for one embodiment of the present application.
FIG. 4 is an exemplary graph of a difference set for one embodiment of the present application.
Fig. 5 is an exemplary flowchart of a touch detection method according to an embodiment of the present application.
Fig. 6 is a diagram illustrating an example of a backup reference value set according to an embodiment of the present application.
FIG. 7 is an exemplary diagram of an original set of values in another embodiment of the present application.
FIG. 8 is an exemplary diagram of function coefficients for one embodiment of the present application.
FIG. 9 is an exemplary plot of a set of fit reference values for one embodiment of the present application.
FIG. 10 is a diagram illustrating an example set of differences for another embodiment of the present application.
Fig. 11 is an exemplary structural diagram of a touch chip according to an embodiment of the present application.
Fig. 12 is an exemplary structural diagram of a touch chip according to another embodiment of the present application.
Detailed Description
Fig. 1 is a diagram illustrating a system of a capacitive touch screen and a touch chip. It should be understood that the system shown in fig. 1 is only an example, and that other modules or units may be included in the system, or that modules having similar functions to the respective modules in fig. 1 may be included. For example, the capacitive touch screen shown in fig. 1 is a mutual capacitive touch screen, and the capacitive touch screen in the embodiment of the present application may also be a self-capacitive touch screen.
It should be noted that the touch chip may also be referred to as a touch control chip or a touch controller.
As shown in FIG. 1, the capacitive sensors of capacitive touch screen 110 are generally comprised of drive (TX) and sense (RX) electrodes. The location where each drive electrode and each sense electrode intersect can be considered a capacitive sense node.
The touch chip 120 may input a signal with a certain frequency to the driving electrode, and the signal may be referred to as a driving signal. The driving signal is output to the touch chip by the sensing electrode after passing through the capacitive sensor. The signal output by the sensing electrode to the touch chip may be referred to as a sensing signal. The touch control chip performs analog-to-digital conversion, digital signal processing and other operations on the sensing signal to obtain an original value of the corresponding capacitance sensing node.
For example, a memory of the touch chip may store a reference value set as shown in fig. 2. In FIG. 2, TXiAnd RXjAnd the value corresponding to the crossed position is used for determining whether touch exists at a capacitive sensing node at the crossed position of the ith driving electrode and the jth sensing electrode of the capacitive touch screen. i gets from 1 to 8 and j gets from 1 to 8.
When a touch is made on the capacitive touch screen, an example of the raw value set collected by the touch chip is shown in fig. 3. The set of reference values shown in fig. 2 is subtracted from the original set of values shown in fig. 3 to obtain a set of difference values as shown in fig. 4. The touch position on the capacitive touch screen can be determined according to the difference set shown in fig. 4, specifically, the capacitive sensing node corresponding to the original value in the dashed box shown in fig. 4.
When the capacitive touch screen works at one of all frequencies supported by the capacitive touch screen, if the influence of noise is too large, the touch chip can output a driving signal of the other frequency supported by the capacitive touch screen to the capacitive touch screen, namely, frequency hopping is carried out, so that the influence of noise on the detection accuracy of the touch position on the capacitive touch screen is avoided.
In the prior art, when the working frequency of the capacitive touch screen is hopped, the touch chip collects a raw value set when the touch screen works at the frequency after frequency hopping, and directly uses the raw value set as a reference value set for detecting the touch position on the capacitive touch screen when the capacitive touch screen works at the frequency after frequency hopping.
If the touch chip takes the original value set acquired when the touch screen works at the frequency after frequency hopping as the reference value set of the frequency after frequency hopping, and if a touch exists on the capacitive touch screen during acquisition, the reference value at the touch position in the reference value set of the frequency after frequency hopping is wrong, so that the touch judgment at the touch position is wrong when the capacitive touch screen works at the frequency after frequency hopping, that is, the touch cannot be detected, and the detection accuracy of the touch position on the capacitive touch screen is influenced. Therefore, the embodiment of the application provides a new touch detection method.
FIG. 5 is a schematic flow chart diagram of a touch detection method according to one embodiment of the present application. It should be understood that fig. 5 shows steps or operations of the touch detection method, but the steps or operations are only examples, and other operations or variations of the operations in fig. 5 may also be performed by the embodiments of the present application.
And S510, determining that the driving signal of the touch screen hops from the current frequency to the target frequency.
For example, when the touch screen operates under the driving of the driving signal of the current frequency, the touch chip performs noise detection, and when noise is detected and the noise value exceeds a predetermined threshold, frequency hopping may be performed, that is, the touch screen is driven to operate by the driving signal of the frequency different from the current frequency, so as to reduce the influence of the noise. For the sake of the following description, the frequency of the frequency-hopped drive signal is referred to as a target frequency.
The touch screen may be a capacitive touch screen.
S520, driving the touch screen by the driving signal of the reference frequency, wherein the reference frequency is different from the target frequency.
That is, after it is determined that the driving signal of the touch screen needs to be hopped to the target frequency, the driving signal can be hopped to a reference frequency different from the target frequency. Wherein, the reference frequency can be configured in advance.
And S530, collecting the original value set of the touch screen working at the reference frequency as a first original value set.
In particular, when the touch screen is driven with a drive signal at a reference frequency, a set of raw values is acquired and referred to as a first set of raw values.
And S540, determining a first touch position where touch exists on the touch screen according to the first original value set and the backup reference value set of the reference frequency.
That is, after the first set of raw values is collected in S530, the touch position where a touch exists on the touch screen when the touch screen operates at the reference frequency may be determined according to the first set of raw values and the backup set of reference values of the reference frequency.
The touch location determined from the first set of raw values and the set of backup reference values for the reference frequency is referred to as a first touch location.
The set of backup reference values for the reference frequency may be preconfigured. For example, the configuration may be completed at a time node before the touch chip leaves a factory, at an initialization time, or the like.
Before configuring the reference frequency and the backup reference value set of the reference frequency, the backup reference value set of the reference frequency and the reference frequency needs to be determined or acquired first.
One possible implementation of obtaining the reference frequency and the backup set of reference values for the reference frequency may include: inputting a driving signal of a plurality of frequencies to the touch screen to drive the touch screen, wherein the driving signal of each frequency can be repeatedly input for a plurality of times, so that a plurality of original value sets can be collected corresponding to the driving signal of each frequency; comparing a plurality of sets of raw values corresponding to the drive signal of each frequency respectively; and recording the frequency corresponding to the original value sets with the minimum change as a reference frequency, and taking the average value of the original value sets corresponding to the reference frequency as a backup reference value set of the reference frequency.
In the process of acquiring the backup reference value set of the reference frequency, when the original value set is acquired, generally, no touch is made on the touch screen. Furthermore, the effect of noise should be reduced as soon as possible.
And S550, driving the touch screen by the driving signal with the target frequency.
I.e., frequency hopping to a target frequency, and driving the touch screen with a driving signal of the target frequency.
And S560, collecting the original value set of the touch screen working at the target frequency as a second original value set.
That is, when the touch screen is driven with a drive signal at a target frequency, a set of raw values is collected and taken as a second set of raw values.
Typically, the first set of raw values collected while the touch screen is operating at the target frequency is taken as the second set of raw values.
It should be understood that the present embodiment does not limit the execution sequence of S520, S530 and S550, S560. For example, S550 and S560 may be performed first, and then S520 and S530 may be performed. That is to say, the driving signal of the touch screen may hop from the current frequency to the target frequency first, and the touch chip acquires the second raw value set; then, the driving signal of the touch screen hops from the target frequency to the reference frequency, and the touch chip acquires the first original value set. Thereafter, the driving signal of the touch screen hops to the target frequency again.
S570, determining a set of reference values for the target frequency from the second set of raw values and the first touch location,
Specifically, the reference value set of the target frequency is determined according to the second original value set acquired when the touch screen works at the target frequency and the first touch position where the touch exists on the touch screen.
And S580, determining the touch position of the touch screen working at the target frequency according to the reference value set of the target frequency.
That is to say, after the reference value set at the target frequency is determined, an original value set when the touch screen operates at the target frequency may be collected, and the touch position on the touch screen may be determined according to the original value set and the reference value set at the target frequency.
For example, an original value set collected when the touch screen operates at the target frequency may be subtracted from the reference value set of the target frequency to obtain a difference set, and the touch position on the touch screen may be determined according to the difference set.
In the embodiment of the application, a first touch position where touch exists on the touch screen is determined according to the backup reference value set of the reference frequency and the first original value set collected under the reference frequency, and then the reference value set of the target frequency is obtained according to the second original value set collected under the target frequency and the first touch position, so that when touch exists in the process that the touch screen hops from the current frequency to the target frequency, the influence of the touch on the reference value set of the target frequency is reduced, and the detection accuracy of the touch position on the touch screen is improved.
In S540, when the first touch position where the touch exists on the touch screen is determined according to the first original value set and the backup reference value set of the reference frequency, one possible implementation manner may include: fitting the backup reference value set of the reference frequency and the first original value set according to the first function to obtain a undetermined coefficient in the first function; obtaining a fitting reference value set according to the backup reference value set of the reference frequency and a first function; a first touch location is determined from the set of fitted reference values and the first set of raw values.
That is, the backup reference value set of the reference frequency and the first original value set are fitted, the fitting reference value set is obtained according to the function and the backup reference value set obtained through fitting, and then the first touch position is determined according to the fitting reference value set and the first original value set. This helps to eliminate the influence of factors such as temperature and noise on the first touch position, so that the detection accuracy of the touch position on the touch screen can be further improved.
Alternatively, the first function used in fitting the backup set of reference values and the first set of original values for the reference frequency may be a linear function, e.g. the first function may be y m x + b.
Alternatively, when fitting the backup set of reference values and the first set of original values for the reference frequency, one possible fitting may be a least squares fit. Specifically, the fitting may be performed by using, as an independent variable of the first function, a value in the driving signal direction on the driving electrode in the backup reference value set, and using, as a dependent variable of the first function, a value in the driving signal direction on the driving electrode in the first original value set.
After the first function is obtained by fitting, the backup reference value set can be substituted into the first function as an independent variable to obtain corresponding function values, and the function values form the fitting reference value set.
Optionally, the touch chip may subtract the first raw value set from the fitting reference raw value set to obtain an raw value difference set, and obtain the first touch position according to the raw value difference set.
A more detailed example of how the first touch location is determined based on the backup set of reference values and the first set of raw values for the reference frequency is described below.
An example of a backup set of reference values for a reference frequency is shown in fig. 6, and an example of a first set of original values for a reference frequency is shown in fig. 7. The reference value in the ith column in fig. 6 is used as an independent variable x in a function y, m x + b, the original value in the ith column in fig. 7 is used as a dependent variable y of the function, and the least square fitting is carried out, and the obtained values of the ith m and b are shown in the ith column in fig. 8, wherein i is taken from 1 to 8.
Substituting the reference value of the ith column in fig. 6 as an argument x into the linear function determined according to the ith columns m and b in fig. 8, results in the fitting reference value of the ith column as in fig. 9.
The first set of raw values shown in fig. 7 is subtracted from the set of fitted reference values shown in fig. 9, resulting in a set of difference values as shown in fig. 10. The first touch location can be determined from the set of differences shown in FIG. 10, i.e., the location of the capacitive sense node corresponding to the difference in the dashed line shown in FIG. 10.
It should be understood that the above method for determining the first touch position according to the first original value set and the backup reference value set of the reference frequency is only an exemplary illustration, and the embodiment of the present application is not limited thereto. For example, the first set of raw values may be subtracted from the set of backup reference values for the reference frequency and the first touch location determined from the resulting set of difference values.
In S570, determining a set of reference values of the target frequency according to the first touch position and the second set of raw values acquired when the touch screen operates at the target frequency, may include: and determining a reference value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency.
Specifically, one or more reference values in the reference value set of the target frequency may correspond to the first touch position, and the reference value in the reference value set of the target frequency corresponding to the first touch position may be obtained from the second raw value set and the reference value set of the current frequency.
When determining the reference value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency, one possible implementation manner may include: calculating the average value of all the original values in the second original value set as a first average value; calculating the average value of all reference values in the reference value set of the current frequency as a second average value; and adding the first average value to a first reference value in the reference value set of the current frequency, and subtracting a second average value to obtain a numerical value which is taken as a second reference value in the reference value set of the target frequency, wherein the first reference value and the second reference value are both values corresponding to the first touch position, and the position of the first reference value in the reference value set of the current frequency is the same as the position of the second reference value in the reference value set of the target frequency.
The first reference value is one of the reference values corresponding to the first touch position in the reference value set of the current frequency, and the second reference value is one of the reference values corresponding to the first touch position in the reference value set of the target frequency.
It should be understood that all reference values corresponding to the first touch position in the reference value set of the target frequency may be obtained according to the method for determining the second reference value described above. The reference value of the reference value set of the target frequency, which is not corresponding to the first touch position, may be directly obtained from the original value of the second original value set, which is not corresponding to the first touch position, that is, the original value of the second original value set, which is not corresponding to the first touch position, may be used as the reference value of the reference value set of the target frequency, which is not corresponding to the first touch position.
It should be noted that in S540, when the first touch position where a touch exists on the touch screen is determined according to the first original value set and the backup reference value set of the reference frequency, one possible result is that no touch exists on the touch screen, that is, the first touch position may be empty. At this time, in S570, when the reference value set of the target frequency is determined according to the second raw value set and the first touch position, the reference value set of the target frequency may be the second raw value set, that is, the second raw value set may be directly used as the reference value set of the target frequency.
When the first touch position determined in S540 is not empty, and the set of reference values of the target frequency is determined according to the second set of original values and the set of reference values of the current frequency, the touch detection method of the embodiment of the present application may further include: taking the original value set acquired when the touch screen works at the target frequency and is not touched on the touch screen as a third original value set; and taking a first original value in the third original value set as a second reference value in the reference value set of the target frequency, wherein the first original value is an original value in the third original value set corresponding to the first touch position, and the position of the first original value in the third original value set is the same as the position of the second reference value in the reference value set of the target frequency.
In other words, when it is determined that no touch has been made at the first touch position according to the third original value set acquired when the touch screen operates at the target frequency, the reference value corresponding to the first touch position in the reference value set of the target frequency is updated. Therefore, the touch detection rate accuracy of the touch screen at the first touch position when the touch screen works at the target frequency and no touch exists at the first touch position is improved, and the touch detection accuracy of the touch screen is further improved.
Wherein the first original value is one of original values in the third set of original values corresponding to the first touch position.
It should be noted that, in the updating of the reference value set of the target frequency, each of the reference values corresponding to the first touch position in the reference value set of the target frequency may be implemented according to the method of updating the second reference value described above.
Fig. 11 is an exemplary structure diagram of a touch chip according to an embodiment of the present application, where the touch chip can implement the functions of the touch chip in the embodiment shown in fig. 5. It should be understood that the touch chip 1100 shown in fig. 11 is only an example, and the touch chip of the embodiment of the present application may further include other modules or units, or include modules having functions similar to those of the respective modules in fig. 11, or not include all the modules in fig. 11.
The first processing module 1110 is configured to determine that a driving signal of the touch screen hops from a current frequency to a target frequency.
The driving module 1120 is configured to drive the touch screen with a driving signal of a reference frequency.
The acquiring module 1130 is configured to acquire a set of original values of the touch screen operating at a reference frequency as a first set of original values, where the reference frequency is different from the target frequency.
The second processing module 1140 is configured to determine a first touch position where a touch exists on the touch screen according to the backup reference value set of the reference frequency and the first original value set acquired by the acquisition module.
The driving module 1120 is further configured to drive the touch screen with a driving signal of a target frequency.
The acquisition module 1130 is further configured to acquire the set of raw values as a second set of raw values when the touch screen is operating at the target frequency.
The third processing module 1150 is configured to determine a set of reference values of the target frequency according to the second set of raw values acquired by the acquisition processing module and the first touch position determined by the second processing module.
The second processing module 1140 is further configured to determine a touch location of the touch screen operating at the target frequency according to the set of reference values at the target frequency.
According to the touch chip in the embodiment of the application, the first touch position on the touch screen is determined according to the first original value set and the backup reference value set corresponding to the reference frequency, and then the reference value set of the target frequency is determined according to the second original value set and the first touch position corresponding to the target frequency, so that when a touch exists in the process that a driving signal of the touch screen hops from the current frequency to the target frequency, the influence of the touch on the reference value set of the target frequency is reduced, and the touch detection accuracy of the touch screen is improved.
Optionally, the first processing module 1110 may be specifically configured to: fitting the backup reference value set and the first original value set according to a first function to obtain a undetermined coefficient in the first function; obtaining a fitting reference value set according to the backup reference value set, the coefficient to be determined and the first function; a first touch location is determined from the set of fitted reference values and the first set of raw values.
Alternatively, the first function may be a linear function, and the fitting may be a least squares fit.
Optionally, the third processing module 1150 may be specifically configured to: and determining a reference value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency.
Optionally, the third processing module 1150 is specifically configured to:
calculating the average value of all the original values in the second original value set as a first average value;
calculating the average value of all reference values in the reference value set of the current frequency as a second average value;
and adding the first average value to a first reference value in the reference value set of the current frequency, and subtracting a second average value to obtain a numerical value which is taken as a second reference value in the reference value set of the target frequency, wherein the first reference value and the second reference value are both values corresponding to the first touch position, and the position of the first reference value in the reference value set of the current frequency is the same as the position of the second reference value in the reference value set of the target frequency.
Optionally, the acquiring module 1130 is further configured to use the set of raw values acquired when the touch screen operates at the target frequency and there is no touch on the touch screen as the third set of raw values.
Correspondingly, the third processing module 1150 is further configured to use a first original value in the third original value set as the second reference value in the reference value set of the target frequency, where the first original value is an original value in the third original value set corresponding to the first touch position, and where the first original value is located in the third original value set at the same position as the third reference value in the reference value set of the target frequency.
It should be understood that the above and other operations and/or functions of each unit of the touch chip in the embodiment of the present application shown in fig. 11 may be further referred to implement the corresponding process executed by the touch chip in the embodiment shown in fig. 5, and for brevity, are not described again here.
Fig. 12 is a schematic structural diagram of a touch chip according to another embodiment of the present application. The touch chip is used for realizing the functions of the touch chip in the embodiment shown in fig. 5. It should be understood that the touch chip 1200 shown in fig. 12 is only an example, and the touch chip of the embodiment of the present application may further include other modules or units, or include modules having functions similar to those of the respective modules in fig. 12, or not include all the modules in fig. 12.
The memory 1210 stores computer program code, reference frequencies, sets of backup reference values for the reference frequencies, sets of dynamically acquired raw values, sets of dynamically generated reference values, and the like.
The processor 1221 in the MCU 1220 executes the computer program codes stored in the memory and may control the driving circuit 1230 to output driving signals of corresponding frequencies to the touch screen to drive the touch screen to operate, and to generate a set of reference values, detect touch positions from the set of raw values and the set of reference values and the set of backup reference values, and so on.
The conversion circuit 1222 generates a set of raw values from the sensing signal collected by the sensing circuit 1240 from the touch screen.
The driving circuit 1230 outputs a driving signal of a corresponding frequency to the touch screen under the control of the MCU 1220.
The sensing circuit 1240 collects sensing signals output by the touch screen under the control of the MCU 1220.
In particular, the processor 1221 is configured to determine that a driving signal of the touch screen hops from a current frequency to a target frequency.
The driving circuit 1230 is used for driving the touch screen with a driving signal of a reference frequency.
The conversion circuit 1222 is configured to generate a raw value set as a first raw value set according to the sensing signal collected by the sensing circuit 1240 when the touch screen operates at a reference frequency, where the reference frequency is different from the target frequency.
The processor 1221 is configured to determine a first touch position where a touch exists on the touch screen according to the backup set of reference frequencies and the first set of raw values collected by the conversion circuit 1222.
The driving circuit 1230 is also used to drive the touch screen with a driving signal of a target frequency.
The conversion circuit 1222 is further configured to generate a set of raw values as a second set of raw values according to the sensing signal collected by the sensing circuit 1240 when the touch screen operates at the target frequency.
The processor 1221 is further configured to determine a set of reference values for the target frequency based on the second set of raw values generated by the conversion circuit 1222 and the first touch location determined by the processor 1221.
The processor 1221 is further configured to determine a touch location of the touch screen operating at the target frequency based on the set of reference values for the target frequency.
According to the touch chip in the embodiment of the application, the first touch position on the touch screen is determined according to the first original value set and the backup reference value set corresponding to the reference frequency, and then the reference value set of the target frequency is determined according to the second original value set and the first touch position corresponding to the target frequency, so that when a touch exists in the process that a driving signal of the touch screen hops from the current frequency to the target frequency, the influence of the touch on the reference value set of the target frequency is reduced, and the touch detection accuracy of the touch screen is improved.
Optionally, the processor 1221 is specifically configured to:
fitting the backup reference value set and the first original value set according to a first function to obtain a undetermined coefficient in the first function;
obtaining a fitting reference value set according to the backup reference value set, the coefficient to be determined and the first function;
a first touch location is determined from the set of fitted reference values and the first set of raw values.
Optionally, the first function is a linear function and the fitting is a least squares fit.
Optionally, the processor 1221 is specifically configured to: and determining a reference value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency.
Optionally, the processor 1221 is specifically configured to:
calculating the average value of all the original values in the second original value set as a first average value;
calculating the average value of all reference values in the reference value set of the current frequency as a second average value;
and adding the first average value to a first reference value in the reference value set of the current frequency, and subtracting a second average value to obtain a numerical value which is taken as a second reference value in the reference value set of the target frequency, wherein the first reference value and the second reference value are both values corresponding to the first touch position, and the position of the first reference value in the reference value set of the current frequency is the same as the position of the second reference value in the reference value set of the target frequency.
Optionally, the conversion circuit 1222 is further configured to use the set of raw values collected when the touch screen is operating at the target frequency and there is no touch on the touch screen as the third set of raw values.
Accordingly, the processor 1221 is further configured to use a first original value of the third set of original values as a second reference value of the set of reference values of the target frequency, the first original value being an original value of the third set of original values corresponding to the first touch position, the position of the first original value in the third set of original values being the same as the position of the third reference value in the set of reference values of the target frequency.
It should be understood that the above and other operations and/or functions of each unit of the touch chip in the embodiment of the present application shown in fig. 12 may be further referred to for implementing the corresponding process executed by the touch chip in the embodiment shown in fig. 5, and for brevity, no further description is repeated here.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. A touch detection method, comprising:
determining that a driving signal of the touch screen hops from a current frequency to a target frequency;
driving the touch screen with a driving signal of a reference frequency, wherein the reference frequency is different from the target frequency;
acquiring a touch original value of the touch screen working at the reference frequency as a first original value set;
determining a first touch position where a touch exists on the touch screen according to the first original value set and the backup reference value set of the reference frequency;
driving the touch screen with a driving signal of the target frequency;
acquiring a touch original value of the touch screen working at the target frequency as a second original value set;
determining a set of reference values for the target frequency from the second set of raw values and the first touch position;
And determining the touch position of the touch screen working at the target frequency according to the reference value set of the target frequency.
2. The method of claim 1, wherein determining a first touch location on the touch screen at which a touch is present based on the first set of raw values and the set of backup reference values for the reference frequency comprises:
fitting the backup reference value set and the first original value set according to a first function to obtain a undetermined coefficient in the first function;
obtaining a fitting reference value set according to the backup reference value set, the coefficient to be determined and the first function;
determining the first touch location from the set of fitted reference values and the first set of raw values.
3. The touch detection method of claim 2, wherein the first function is a linear function and the fitting is a least squares fit.
4. The touch detection method according to any one of claims 1 to 3, wherein the determining the set of reference values for the target frequency from the second set of raw values and the first touch position comprises:
And determining a reference value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency.
5. The method of claim 4, wherein determining the reference value corresponding to the first touch location in the set of reference values for the target frequency from the second set of raw values and the set of reference values for the current frequency comprises:
calculating an average value of all original values in the second original value set as a first average value;
calculating the average value of all reference values in the reference value set of the current frequency as a second average value;
and adding the first average value to a first reference value in the reference value set of the current frequency, and subtracting the second average value to obtain a numerical value serving as a second reference value in the reference value set of the target frequency, wherein the first reference value and the second reference value are both values corresponding to the first touch position, and the position of the first reference value in the reference value set of the current frequency is the same as the position of the second reference value in the reference value set of the target frequency.
6. The touch detection method according to claim 4, further comprising:
taking the original value set acquired when the touch screen works at the target frequency and no touch exists at the first touch position as a third original value set;
and using a first original value in the third original value set as a second reference value in the reference value set of the target frequency, the first original value being an original value in the third original value set corresponding to the first touch position, the position of the first original value in the third original value set being the same as the position of the second reference value in the reference value set of the target frequency.
7. A touch chip, comprising:
the first processing module is used for determining that a driving signal of the touch screen hops from the current frequency to the target frequency;
the driving module is used for driving the touch screen by a driving signal with a reference frequency;
the acquisition module is used for acquiring a raw value set of the touch screen working at the reference frequency as a first raw value set;
the second processing module is used for determining a first touch position where touch exists on the touch screen according to the backup reference value set of the reference frequency and the first original value set acquired by the acquisition module;
The driving module is further used for driving the touch screen by the driving signal of the target frequency;
the acquisition module is further used for acquiring a raw value set as a second raw value set when the touch screen works at the target frequency;
the third processing module is used for determining a reference value set of the target frequency according to the second original value set acquired by the acquisition module and the first touch position determined by the second processing module;
the second processing module is further configured to determine, according to the reference value set of the target frequency determined by the third processing module, a touch position of the touch screen when the touch screen operates at the target frequency.
8. The touch chip of claim 7, wherein the second processing module is specifically configured to:
fitting the backup reference value set and the first original value set according to a first function to obtain a undetermined coefficient in the first function;
obtaining a fitting reference value set according to the backup reference value set, the coefficient to be determined and the first function;
determining the first touch location from the set of fitted reference values and the first set of raw values.
9. The touch chip of claim 8, wherein the first function is a linear function and the fitting is a least squares fitting.
10. The touch chip according to any one of claims 7 to 9, wherein the third processing module is specifically configured to:
and determining a reference value corresponding to the first touch position in the reference value set of the target frequency according to the second original value set and the reference value set of the current frequency.
11. The touch chip of claim 10, wherein the third processing module is specifically configured to:
calculating an average value of all original values in the second original value set as a first average value;
calculating the average value of all reference values in the reference value set of the current frequency as a second average value;
and adding the first average value to a first reference value in the reference value set of the current frequency, and subtracting the second average value to obtain a numerical value serving as a second reference value in the reference value set of the target frequency, wherein the first reference value and the second reference value are both values corresponding to the first touch position, and the position of the first reference value in the reference value set of the current frequency is the same as the position of the second reference value in the reference value set of the target frequency.
12. The touch chip of claim 10, wherein the collecting module is further configured to use a set of raw values collected when the touch screen operates at the target frequency and there is no touch at the first touch position as a third set of raw values;
the third processing module is further configured to use a first original value in the third original value set as a second reference value in the reference value set of the target frequency, where the first original value is an original value in the third original value set corresponding to the first touch position, and a position of the first original value in the third original value set is the same as a position of the second reference value in the reference value set of the target frequency.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/095262 WO2019023878A1 (en) | 2017-07-31 | 2017-07-31 | Touch detection method and touch chip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109791448A CN109791448A (en) | 2019-05-21 |
| CN109791448B true CN109791448B (en) | 2021-11-12 |
Family
ID=65232286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780000761.9A Active CN109791448B (en) | 2017-07-31 | 2017-07-31 | Touch detection method and touch chip |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109791448B (en) |
| WO (1) | WO2019023878A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110362240A (en) * | 2019-07-22 | 2019-10-22 | 深圳市华科创智技术有限公司 | A kind of capacitance plate and terminal device with channel handoff functionality |
| CN112363639B (en) * | 2020-11-11 | 2023-04-18 | 青岛海信商用显示股份有限公司 | Intelligent device and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583923A (en) * | 2007-01-03 | 2009-11-18 | 苹果公司 | Multi-touch auto scanning |
| CN102830837A (en) * | 2012-07-19 | 2012-12-19 | 深圳市汇顶科技有限公司 | Noise suppression method and system for touch detection, and touch terminal |
| US20150103042A1 (en) * | 2013-10-15 | 2015-04-16 | Anapass Inc. | Method of removing common noise and method of detecting touch information |
| CN104660024A (en) * | 2015-01-12 | 2015-05-27 | 友达光电股份有限公司 | Noise suppression method and voltage converter |
| CN105786241A (en) * | 2015-01-14 | 2016-07-20 | 三星电子株式会社 | Touch Controller, Touch Sensing Device, And Touch Sensing Method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9285937B2 (en) * | 2012-12-05 | 2016-03-15 | Japan Display Inc. | Display device with touch detection function, drive method thereof, and electronic apparatus |
| EP3159777B1 (en) * | 2015-10-20 | 2024-05-29 | LG Display Co., Ltd. | Method and circuit for driving touch sensors and display device using the same |
-
2017
- 2017-07-31 CN CN201780000761.9A patent/CN109791448B/en active Active
- 2017-07-31 WO PCT/CN2017/095262 patent/WO2019023878A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583923A (en) * | 2007-01-03 | 2009-11-18 | 苹果公司 | Multi-touch auto scanning |
| CN102830837A (en) * | 2012-07-19 | 2012-12-19 | 深圳市汇顶科技有限公司 | Noise suppression method and system for touch detection, and touch terminal |
| US20150103042A1 (en) * | 2013-10-15 | 2015-04-16 | Anapass Inc. | Method of removing common noise and method of detecting touch information |
| CN104660024A (en) * | 2015-01-12 | 2015-05-27 | 友达光电股份有限公司 | Noise suppression method and voltage converter |
| CN105786241A (en) * | 2015-01-14 | 2016-07-20 | 三星电子株式会社 | Touch Controller, Touch Sensing Device, And Touch Sensing Method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109791448A (en) | 2019-05-21 |
| WO2019023878A1 (en) | 2019-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9069427B2 (en) | High noise immunity sensing methods and apparatus for a capacitive touch device | |
| US9182862B2 (en) | High noise immunity sensing methods and apparatus for a capacitive touch device | |
| US20090066659A1 (en) | Computer system with touch screen and separate display screen | |
| CN103488364A (en) | Capacitive touch screen and self-adaptation correction method and system of capacitive touch screen | |
| CN103576981B (en) | Identification equipment and method are inputted using the electronic pen of C type touch screen panels | |
| WO2014160436A1 (en) | Baseline management for sensing device | |
| US20120249448A1 (en) | Method of identifying a gesture and device using the same | |
| WO2014160425A1 (en) | Proximity sensing | |
| CN109643200A (en) | The update method of a reference value of electronic equipment, touch detection circuit and touch screen | |
| KR102329097B1 (en) | Touch detection in a capacitive sensor system | |
| KR20160006345A (en) | Appratus of Capacitive Touch Panel and Method of driving the same | |
| CN109791448B (en) | Touch detection method and touch chip | |
| EP3462293A1 (en) | Method for determining touch position and touch control chip | |
| CN107636583B (en) | Method for determining touch position and touch control chip | |
| US20160364066A1 (en) | Information Processing Method and Electronic Device | |
| US20190107917A1 (en) | Impedance ratio-based current conveyor | |
| JP5997842B2 (en) | Touch panel system and electronic information device | |
| TWI480790B (en) | Touch device and driving method thereof | |
| CN108700963B (en) | Touch chip, touch detection method and device and terminal equipment | |
| CN110554791B (en) | Touch panel signal detection method and device | |
| US10558306B2 (en) | In-cell touch apparatus and a water mode detection method thereof | |
| CN114026528B (en) | Touch panel system and display | |
| US11106317B1 (en) | Common mode noise suppression with restoration of common mode signal | |
| US11914820B2 (en) | Distributed analog display noise suppression circuit | |
| RU2671305C1 (en) | Method of automated user authentication on basis of user signature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |