Touch chip, signal processing method and electronic equipment

Abstract

The invention discloses a touch chip, a signal processing method and electronic equipment, and belongs to the technical field of touch display. The touch control chip comprises a touch control driver. Wherein the touch driver is used for acquiring an input signal and generating a compensation signal under the condition that the input signal is acquired when a touch pen and a finger contact a touch screen at the same time, the compensation signal represents the difference between the input signal and a standard signal, and the standard signal represents a signal generated when the touch pen contacts the touch screen; and the touch driver is also used for correcting the input signal according to the compensation signal to obtain a correction signal, and determining the contact position of the touch pen and the touch screen based on the correction signal. According to the invention, the distortion phenomenon of the input signal can be reduced, the input precision of the stylus is improved, and the user experience is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of touch display technology, and in particular to a touch chip, a signal processing method and an electronic device. Background Art

[0002] As the usability and functionality of electronic devices improve, the use of styluses is also increasing. A stylus is a tool used to interact with the touch screen of an electronic device. Users can use the stylus to click on the touch screen to select files or draw, etc. However, when users use the stylus, the signal is often distorted due to accidental touch of the touch screen by their fingers, which affects the input accuracy of the stylus and reduces the user experience. Summary of the invention

[0003] The embodiments of the present application provide a touch chip, a signal processing method and an electronic device, which can reduce the distortion of input signals, improve the input accuracy of the stylus pen, and thus improve the user experience. The technical solution is as follows:

[0004] In a first aspect, the present application provides a touch control chip, the touch control chip comprising a touch control driver;

[0005] A touch driver, for acquiring an input signal, and generating a compensation signal when the input signal is acquired by a stylus pen and a finger contacting the touch screen at the same time, wherein the compensation signal represents a difference between the input signal and a standard signal, and the standard signal represents a signal generated by the stylus pen contacting the touch screen;

[0006] The touch control driver is further used to correct the input signal according to the compensation signal to obtain a correction signal, and determine the contact position between the stylus pen and the touch screen based on the correction signal.

[0007] In a possible implementation, the touch driver includes a signal sensing unit, a compensation sensing unit, and a control processor;

[0008] A signal sensing unit, used for acquiring an input signal and transmitting the input signal to a control processor;

[0009] A compensation sensing unit, for generating a compensation signal when the input signal is obtained by the stylus pen and the finger contacting the touch screen at the same time, and transmitting the compensation signal to the control processor;

[0010] The control processor is used to correct the input signal according to the compensation signal to obtain a correction signal, and determine the contact position between the stylus pen and the touch screen based on the correction signal.

[0011] In a possible implementation, the compensation sensing unit is specifically used to:

[0012] A noise signal is generated, and a compensation signal is determined according to the noise signal and an input signal, wherein the noise signal represents the working noise of the stylus.

[0013] In a possible implementation, the compensation sensing unit includes a frequency modulator, an amplitude modulator, and a regulator;

[0014] A frequency modulator, used to generate a first signal and transmit the first signal to the amplitude modulator, wherein the frequency of the first signal is the operating frequency of the stylus;

[0015] An amplitude modulator, used to modulate the first signal to obtain a second signal, and transmit the second signal to the regulator, wherein the amplitude of the second signal represents the magnitude of the working noise;

[0016] The regulator is used for regulating the second signal to obtain a noise signal.

[0017] In a possible implementation manner, when determining the compensation signal according to the noise signal and the input signal, the compensation sensing unit is specifically used to:

[0018] A first position where the stylus touches the touch screen is calculated according to the input signal, a second position where the finger touches the touch screen is calculated according to the noise signal, and a compensation signal is determined according to the noise signal, the first position and the second position.

[0019] In a possible implementation manner, when the compensation sensing unit determines the compensation signal according to the noise signal, the first position and the second position, it is specifically used to:

[0020] A compensation coefficient is determined according to the first position and the second position, and a compensation signal is determined according to the compensation coefficient and the noise signal.

[0021] In a possible implementation, the control processor is further used to classify the input signal through the signal classification model to obtain a classification result, and send the classification result to the compensation sensing unit;

[0022] The classification result represents any of the following:

[0023] The input signal is obtained when only the stylus is in contact with the touch screen;

[0024] The input signal is obtained when only the finger touches the touch screen;

[0025] The input signal is obtained when the stylus pen and the finger are in contact with the touch screen at the same time.

[0026] In a possible implementation, when the control processor classifies the input signal through the signal classification model to obtain the classification result, it is specifically used to:

[0027] The input signal is filtered to obtain a filtered signal, and the filtered signal is classified by a signal classification model to obtain a classification result.

[0028] In a second aspect, a signal processing method is provided, the method comprising:

[0029] Get input signal;

[0030] In the case where the input signal is obtained by the stylus pen and the finger contacting the touch screen at the same time, generating a compensation signal, the compensation signal representing the difference between the input signal and the standard signal, and the standard signal representing the signal generated by the stylus pen contacting the touch screen;

[0031] Correcting the input signal according to the compensation signal to obtain a correction signal;

[0032] A contact position of the stylus pen with the touch screen is determined based on the calibration signal.

[0033] In a possible implementation, generating a compensation signal includes:

[0034] generating a noise signal, wherein the noise signal represents the working noise of the stylus;

[0035] A compensation signal is determined according to the noise signal and the input signal.

[0036] In a possible implementation manner, generating a noise signal includes:

[0037] Generate a first signal, the frequency of the first signal being the working frequency of the stylus;

[0038] A second signal is obtained by amplitude modulating the first signal, wherein the amplitude of the second signal represents the magnitude of the working noise;

[0039] The second signal is adjusted to obtain a noise signal.

[0040] In a possible implementation, determining a compensation signal according to a noise signal and an input signal includes:

[0041] Calculate a first position where the stylus touches the touch screen according to the input signal;

[0042] Calculate a second position where the finger contacts the touch screen according to the noise signal;

[0043] A compensation signal is determined based on the noise signal, the first position, and the second position.

[0044] In a possible implementation manner, determining a compensation signal according to the noise signal, the first position, and the second position includes:

[0045] Determining a compensation coefficient according to the first position and the second position;

[0046] A compensation signal is determined according to the compensation coefficient and the noise signal.

[0047] In a possible implementation, the method further includes:

[0048] Classify the input signal through the signal classification model to obtain the classification result;

[0049] The classification result represents any of the following:

[0050] The input signal is obtained when only the stylus is in contact with the touch screen;

[0051] The input signal is obtained when only the finger touches the touch screen;

[0052] The input signal is obtained when the stylus pen and the finger are in contact with the touch screen at the same time.

[0053] In a possible implementation, the input signal is classified by a signal classification model to obtain a classification result, including:

[0054] The input signal is filtered to obtain a filtered signal, and the filtered signal is classified by a signal classification model to obtain a classification result.

[0055] In a third aspect, an electronic device is provided, comprising the touch chip in the first aspect or any possible implementation of the first aspect, and the touch chip is used to execute the signal processing method in the second aspect or any possible implementation of the second aspect.

[0056] The technical solution provided by this application brings at least the following beneficial effects:

[0057] The touch driver of the touch chip will automatically generate a compensation signal when the stylus and the finger touch the touch screen at the same time to obtain the input signal, and correct the input signal according to the compensation signal to obtain a correction signal, so that the correction signal can represent the signal generated by the stylus touching the touch screen, with high accuracy, and reduce the distortion of the input signal. Subsequently, the contact position of the stylus and the touch screen can be accurately determined based on the correction signal, and the input accuracy of the stylus can be improved, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0059] Figure 1A schematic diagram of the structure of a touch control chip provided in an embodiment of the present application;

[0060] Figure 2 A schematic diagram of an electronic device provided in an embodiment of the present application;

[0061] Figure 3 A schematic diagram of a circuit when a stylus pen contacts a touch screen provided in an embodiment of the present application;

[0062] Figure 4 A circuit diagram of a finger contact position when a finger and a stylus touch a touch screen provided in an embodiment of the present application;

[0063] Figure 5 A schematic diagram of a sensing process provided in an embodiment of the present application;

[0064] Figure 6 Another schematic diagram of a sensing process provided in an embodiment of the present application;

[0065] Figure 7 A circuit diagram provided for an embodiment of the present application;

[0066] Figure 8 A schematic diagram of the structure of a compensation sensor unit provided in an embodiment of the present application;

[0067] Fig. 9 A line graph provided in an embodiment of the present application;

[0068] Fig.10 A flowchart of a signal processing method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0070] A stylus is a tool used to interact with the touch screen of an electronic device. Users can select files or draw pictures by clicking the touch screen with the stylus. When a user uses the stylus, the input signal is often distorted due to the finger accidentally touching the touch screen, thereby affecting the input accuracy of the stylus and reducing the user experience. In this regard, an embodiment of the present application provides a touch chip for generating a compensation signal when the stylus and the finger touch the touch screen at the same time, correcting the input signal obtained according to the compensation signal, reducing the distortion of the input signal, and improving the input accuracy of the stylus, thereby improving the user experience.

[0071] Figure 1A structural schematic diagram of a touch chip provided in an embodiment of the present application, wherein the touch chip may refer to a touch driver chip, or the touch chip may refer to a touch-display integrated touch driver chip having both touch driver and display driver. Figure 1 The touch chip in the embodiment includes a touch driver 20, and the touch driver 20 is connected to the touch screen 10. The touch driver 20 is used to obtain an input signal, and when the input signal is obtained when the stylus pen and the finger contact the touch screen 10 at the same time, generate a compensation signal, the compensation signal represents the difference between the input signal and the standard signal, and the standard signal represents the signal generated when the stylus pen contacts the touch screen 10; the touch driver 20 is also used to correct the input signal according to the compensation signal to obtain a correction signal, and determine the contact position of the stylus pen and the touch screen 10 based on the correction signal.

[0072] In the embodiment of the present application, the touch screen 10 is an inductive display device on an electronic device, and a touch driver 20 is distributed under the touch screen 10, and an input signal is sensed by the touch driver 20. Among them, the electronic devices include but are not limited to mobile phones, computers, tablets, vehicle terminals, smart appliances, etc. With the development of science and technology, various touch technologies have been born one after another. The touch screen 10 can be divided into: resistive technology touch screen, capacitive technology touch screen, infrared technology touch screen, electromagnetic induction technology touch screen, etc. Any touch screen 10 has its corresponding stylus, and the touch pen can be used to interact with the touch screen 10.

[0073] It is understandable that the interaction principle between the stylus and the touch screen 10 may be different depending on the type of touch screen 10. Taking the electromagnetic induction technology touch screen as an example, in general, the touch driver 20 distributed under the electromagnetic induction technology touch screen is an electromagnetic induction board formed by an electromagnetic sensor, which is used to sense the change of magnetic flux. The stylus is used to transmit electromagnetic signals. In the process of the stylus approaching the touch screen 10 until it touches the touch screen 10, the electromagnetic induction board can convert the change of the magnetic flux of the electromagnetic signal into an electrical signal, and the electrical signal is the input signal. Among them, the input signal can be an analog signal or a digital signal, and the continuously changing analog signal can be converted into a discrete digital signal through an ADC (Analog-to-Digital Converter).

[0074] In summary, the touch driver 20 is implemented based on sensor technology to sense the operation of the touch pen and obtain input signals. In addition, the touch driver 20 can also sense the operation of the finger and obtain input signals to achieve interaction between the finger and the touch screen 10 based on the input signals.

[0075] like Figure 2 As shown, Figure 2This is a schematic diagram of an electronic device provided by an embodiment of the present application, and the electronic device includes a touch screen 10 and a touch driver 20. When a stylus pen 301 contacts the touch screen 10, or when a finger 302 contacts the touch screen 10, or when both the stylus pen 301 and the finger 302 contact the touch screen 10, the touch driver 20 can obtain an input signal.

[0076] In a possible implementation, the touch driver 20 includes a signal sensing unit, and the signal sensing unit is used to obtain an input signal.

[0077] The signal sensing unit is implemented based on sensor technology and is used to sense the operation of a touch pen or finger to obtain an input signal. It is understandable that the type of signal sensing unit varies depending on the touch technology. For example, if the touch technology is infrared technology, the signal sensing unit may include an infrared sensor; if the touch technology is resistive technology, the signal sensing unit may include a resistive touch sensor; if the touch technology is capacitive technology, the signal sensing unit may include a capacitive touch sensor.

[0078] In the embodiment of the present application, the input signal can be obtained only when the stylus pen contacts the touch screen 10 , or only when the finger contacts the touch screen 10 , or when the stylus pen and the finger contact the touch screen 10 at the same time.

[0079] In general, mobile devices rely on batteries or power supplies to work. When a mobile device is powered by a power supply, for example, the mobile device is connected to the power grid through a power cord. Since the mobile device is connected to the ground wire, the mobile device has a strong grounding (Ground, GND) characteristic, so that the mobile device has a certain resistance to conductive noise. When the mobile device is powered by a battery, since the mobile device is not connected to the ground wire, the mobile device has a weak grounding characteristic, which makes the mobile device more susceptible to conductive noise, resulting in signal distortion. In this example, the mobile device includes a touch driver 20. When the touch driver 20 is in a weakly grounded state, due to the influence of conductive noise, the grounding state, power supply and internal signals of the touch driver 20 are easily affected, resulting in output signal distortion.

[0080] like Figure 2As shown, if the stylus pen 301 contacts the touch screen 10, for example, the stylus pen 301 applies a voltage between 17V (voltage unit: volts) and 40V on the touch screen 10, the touch driver 20 will receive an input signal. In addition, during the process of the stylus pen 301 contacting the touch screen 10, the stylus pen 301 will radiate in the touch driver 20 to generate a noise signal. If the touch driver 20 is in a strong grounding state, the touch driver 20 will have a certain resistance to the noise signal, minimizing the impact of the noise signal on the output signal of the touch driver 20. If the touch driver 20 is in a weak grounding state, the noise signal will affect the power supply, grounding, and reference signal of the control processor 303 included in the touch driver 20, etc., resulting in distortion of the output signal of the touch driver 20.

[0081] When only the stylus or finger contacts the touch screen 10, the noise signal has little effect on the output signal and does not affect the accuracy and linearity of the touch driver 20. Figure 3 As shown, Figure 3 A circuit diagram of a touch pen contacting a touch screen provided in an embodiment of the present application, wherein the capacitor Cp is a capacitor corresponding to the touch screen. When the touch pen contacts the touch screen, due to the radiation of the touch pen, the power supply, ground and reference signals of the control processor are affected by the noise signal, thereby reducing the output signal of the control processor, but this signal reduction occurs uniformly on the entire touch driver 20, so that the noise signal does not affect the accuracy and linearity of the touch driver 20.

[0082] In the case where the stylus pen and the finger touch the touch screen 10 at the same time, for example, when the user is drawing on the touch screen 10 with the stylus pen, the user's hand accidentally touches the touch screen 10, resulting in the stylus pen and the finger touching the touch screen 10 at the same time. In this case, the noise signal has a greater impact on the output signal, affecting the accuracy and linearity of the touch driver 20. Figure 4 As shown, Figure 4 A circuit diagram of a finger contact position when a finger and a stylus touch a touch screen is provided for an embodiment of the present application, wherein the finger contact position is different from the stylus contact position, the capacitor Cp is the capacitor corresponding to the touch screen, and the capacitor Cf is the capacitor corresponding to the finger. Due to the radiation of the stylus, the power supply, grounding and reference signals of the control processor are affected by the noise signal. Since the finger touches the touch screen and the finger can be used as a strong ground, the control processor is in a strongly grounded state. Since the finger contact position is different from the stylus contact position, there is no input signal from the stylus for the control processor at the finger contact position, resulting in the output signal of the control processor being equivalent to the noise signal, resulting in output signal distortion.

[0083] Based on this, it is necessary to first identify whether the stylus pen and the finger touch the touch screen 10 at the same time, so as to generate a compensation signal when the stylus pen and the finger touch the touch screen 10 at the same time, and correct the input signal according to the compensation signal to avoid output signal distortion.

[0084] Optionally, the touch driver 20 also includes a compensation sensing unit and a control processor. The output end of the signal sensing unit is connected to the input end of the compensation sensing unit, the output end of the signal sensing unit is connected to the input end of the control processor, and the output end of the compensation sensing unit is connected to the input end of the control processor. Based on this, the signal sensing unit can transmit an input signal to the compensation sensing unit. The compensation sensing unit is used to generate a compensation signal when the input signal is obtained when the stylus pen and the finger contact the touch screen at the same time, and transmit the compensation signal to the control processor. The signal sensing unit can also transmit the input signal to the control processor. The control processor is used to correct the input signal according to the compensation signal to obtain a correction signal, and determine the contact position of the stylus pen and the touch screen based on the correction signal.

[0085] Optionally, the control processor is further used to classify the input signal through the signal classification model, obtain the classification result, and send the classification result to the compensation sensing unit. The classification result represents any of the following: the input signal is obtained when only the stylus touches the touch screen 10; the input signal is obtained when only the finger touches the touch screen 10; the input signal is obtained when the stylus and the finger touch the touch screen 10 at the same time.

[0086] The control processor can classify the input signal based on a machine learning algorithm. Among them, the signal classification model of the embodiment of the present application belongs to a machine learning algorithm, and the structure, size, etc. of the signal classification model are not limited here. For example, the signal classification model is a multi-layer perceptron or a convolutional neural network or a support vector machine. The structure of the signal classification model is different, and the classification method is also different.

[0087] Take the signal classification model including the feature processing network and the classification network as an example. In this example, the way that only the stylus touches the touch screen, the way that only the finger touches the touch screen, and the way that the stylus and the finger touch the touch screen at the same time belong to the three input modes of the signal. Sample signals of various input modes can be obtained in advance, and the signal classification model is obtained by training these sample signals. After that, whenever the input signal is obtained, the input signal is input to the input signal classification model, and the feature processing network is used to extract the features of the input signal to obtain the signal features. The signal features are input into the classification network, and the classification results are output through the classification network. The value of the classification result can reflect the input mode of the input signal.

[0088] For example, the classification result is a probability value between 0 and 1. If the probability value is less than a preset first threshold, it is determined that the classification result represents the first input mode; if the probability value is greater than a preset second threshold, it is determined that the classification result represents the second input mode; if the probability value is not less than the first threshold and not greater than the second threshold, it is determined that the classification result represents the third input mode. Among them, the first threshold and the second threshold are both values ​​between 0 and 1, and the first threshold is less than the second threshold. For another example, the classification result is an array including three elements, the first element represents the first input mode, the second element represents the second input mode, and the third element represents the third input mode. The classification result represents the input mode corresponding to the largest element. For example, if the second element is the largest, the classification result represents the second input mode. The above-mentioned first to third input modes correspond to the above-mentioned three input modes in turn, and the order is not limited here.

[0089] By enabling the signal classification model to learn signals of different input modes and performing pattern classification on the input signals through the signal classification model, the accuracy of the classification results can be improved, so as to facilitate subsequent accurate correction of input signals obtained when the stylus and the finger simultaneously contact the touch screen, and avoid correcting the input signals obtained when only the stylus or only the finger contact the touch screen, which is beneficial to reducing the amount of calculation and improving signal processing efficiency.

[0090] Optionally, when the control processor classifies the input signal through the signal classification model to obtain a classification result, it is specifically used to: filter the input signal to obtain a filtered signal, and classify the filtered signal through the signal classification model to obtain a classification result.

[0091] In the actual use of electronic equipment, electromagnetic radiation interference noise, power supply interference noise, ground loop noise, circuit noise and other noises will be generated. These noises belong to system noise, and system noise will affect the accuracy of the signal. In this regard, the control processor can filter the input signal through filtering technology to remove the system noise in the input signal and obtain a filtered signal with higher accuracy. Among them, the filtering algorithm used for filtering is not limited here. Exemplarily, the filtering algorithm includes at least one of the Kalman filtering algorithm, the sliding average algorithm, the outlier removal algorithm, etc.

[0092] Optionally, several filtering algorithms and corresponding usage conditions are pre-set. When any usage condition is met, the input signal can be filtered by the filtering algorithm corresponding to the usage condition. The content of the usage conditions is not limited here. For example, the usage condition of filtering algorithm 1 is that the stylus pen and the touch screen are in pairing mode, the usage condition of filtering algorithm 2 is that the touch screen is not in pairing mode with the stylus pen, the usage condition of filtering algorithm 3 is that the electronic device is in a power supply state, and the usage condition of filtering algorithm 4 is that the electronic device is in a battery-powered state, etc. By setting the usage conditions of different filtering algorithms and using the corresponding filtering algorithm to filter the input signal when any usage condition is met, it is beneficial to remove the noise of the current device environment in a targeted manner, improve the filtering effect, and thus significantly improve the clarity and accuracy of the filtered signal.

[0093] Afterwards, the control processor can classify the filtered signal. For example, the filtered signal is input into the signal classification model, and the feature processing network is used to extract the feature of the filtered signal to obtain the signal feature, and the signal feature is input into the classification network, and the classification result is output through the classification network. The classification content is described above, and the implementation principles of the two are similar, so they will not be repeated here.

[0094] The control processor may send the classification result to the compensation sensing unit. After the compensation sensing unit receives the classification result, if the classification result indicates that the input signal is obtained only when the stylus pen contacts the touch screen, or the classification result indicates that the input signal is obtained only when the finger contacts the touch screen, the compensation sensing unit does not work and does not generate a compensation signal; if the classification result indicates that the input signal is obtained when the stylus pen and the finger contact the touch screen at the same time, the compensation sensing unit generates a compensation signal.

[0095] like Figure 5 As shown, Figure 5 This is a schematic diagram of a sensing process provided by an embodiment of the present application, and the sensing process belongs to the related art. That is, in the related art, when the stylus pen and / or finger touches the touch screen, only the signal sensing unit is used to sense the input signal. Figure 6 As shown, Figure 6 Another sensing process schematic diagram provided for an embodiment of the present application, which sensing process belongs to the implementation method of the present application. That is to say, in an embodiment of the present application, a compensation sensing unit is added after the signal sensing unit. When only the stylus or only the finger contacts the touch screen, the signal sensing unit is used to sense the input signal, but the compensation sensing unit does not work and does not generate a compensation signal. When the stylus and the finger contact the touch screen at the same time, the signal sensing unit is used to sense the input signal, and the compensation sensing unit generates a compensation signal.

[0096] In a possible implementation, when generating the compensation signal, the compensation sensing unit is specifically used to: generate a noise signal, and determine the compensation signal according to the noise signal and the input signal, wherein the noise signal represents the working noise of the stylus.

[0097] In the embodiment of the present application, the working noise of the stylus is simulated by the noise signal. The way in which the compensation sensor unit generates the noise signal is not limited here, for example, a noise function such as Gaussian noise or Poisson noise is set in the compensation sensor unit to generate the noise signal according to the function.

[0098] In an exemplary embodiment, if Figure 7 As shown, the compensation sensing unit includes a frequency modulator 211, an amplitude modulator 212 and a regulator 213. The output end of the frequency modulator 211 is connected to the input end of the amplitude modulator 212, and the output end of the amplitude modulator 212 is connected to the input end of the regulator 213. The frequency modulator 211 is used to generate a first signal and transmit the first signal to the amplitude modulator 212. The frequency of the first signal is the working frequency of the stylus; the amplitude modulator 212 is used to modulate the first signal to obtain a second signal and transmit the second signal to the regulator 213. The amplitude of the second signal represents the magnitude of the working noise; the regulator 213 is used to adjust the second signal to obtain a noise signal.

[0099] The compensation sensing unit can be used to generate a noise signal, including a frequency modulator 211, an amplitude modulator 212 and a regulator 213. The frequency modulator 211 generates a first signal having a frequency equal to the working frequency of the stylus, and sends the first signal to the amplitude modulator 212. The amplitude modulator 212 receives the first signal, modulates the first signal into a second signal having the same amplitude as the working noise of the stylus, and transmits the second signal to the regulator 213. The regulator 213 receives the second signal and adjusts the second signal into a noise signal representing the working noise of the stylus. Through the frequency modulator 211, the amplitude modulator 212 and the regulator 213, the signal gradually approaches the working noise of the stylus, thereby ensuring the accuracy of the noise signal.

[0100] It is understandable that the stylus itself will generate working noise. Therefore, when only the stylus is in contact with the touch screen, the control processor will inevitably receive the signal of the working noise and determine the accurate output based on the signal. In other words, the control processor has the ability to resist the working noise generated by the stylus, so that although the control processor will receive the signal of the working noise, the signal will not affect the accuracy of the control processor output. Based on this, the embodiment of the present application simulates the working noise of the stylus through a noise signal, and inputs the noise signal into the control processor, so as to create an equivalent environment for the control processor with the same noise as that during the operation of the stylus, thereby effectively eliminating the influence of noise on the output and improving the accuracy of the output.

[0101] Generally, due to the characteristics of the touch screen, the internal of the integrated circuit (IC), and the stylus, the working noise of the stylus tends to gradually increase within a certain period of time. The regulator 213 can adjust the second signal so that the signal tends to gradually increase within the time Δt, so that the adjusted signal is close to the working noise of the stylus, and a noise signal is obtained, such as Figure 7 shown.

[0102] Optionally, the regulator 213 includes at least one of a resistor or a capacitor. The regulator 213 is used to adjust the second signal according to at least one of the resistor or the capacitor to obtain a noise signal. That is, if the regulator 213 includes a resistor, the regulator 213 is used to adjust the second signal according to the resistor to obtain a noise signal; if the regulator 213 includes a capacitor, the regulator 213 is used to adjust the second signal according to the capacitor to obtain a noise signal; if the regulator 213 includes a resistor and a capacitor, the regulator 213 is used to adjust the second signal according to the resistor and the capacitor to obtain a noise signal.

[0103] The output end of the regulator 213 is connected to the input end of the control processor, and is used to send a noise signal to the control processor. Figure 7 As shown, the noise signal is used as a reference signal of the control processor and input into the control processor. In actual applications, when the stylus touches the touch screen, different positions on the touch screen are affected differently by the working noise. Based on this, in this example, the resistance and / or capacitance can be adjusted independently according to the position of the control processor, so that the noise signal is related to the position, ensuring the high accuracy of the noise signal.

[0104] In addition, the compensation sensing unit is used to determine the compensation signal based on the noise signal and the input signal. The method for determining the compensation signal is not limited here. Exemplarily, a function is set for the compensation sensing unit, and the compensation signal is determined based on the noise signal and the input signal using the function. Among them, the time difference between the acquisition time of the compensation signal and the acquisition time of the input signal is not greater than the time difference threshold. In other words, when the signal sensing unit senses the input signal, a compensation signal is generated within the time difference threshold, which realizes the combination of advanced sensing technology and real-time correction algorithm, so that the time error between the compensation signal and the input signal is minimized, the error caused by the delay is reduced, and the accuracy of the compensation signal is improved, so that the signal distortion can be corrected to the maximum extent, and the input signal can be corrected quickly, in real time, and accurately using the compensation signal, thereby improving the input accuracy and user experience.

[0105] The embodiment of the present application does not limit the size of the time difference threshold. Exemplarily, the time difference threshold is data pre-set based on manual experience, or the time difference threshold is data obtained through experimental verification to minimize the error.

[0106] In an exemplary embodiment, when determining the compensation signal based on the noise signal and the input signal, the compensation sensing unit is specifically used to: calculate a first position where the stylus touches the touch screen based on the input signal, calculate a second position where the finger touches the touch screen based on the noise signal, and determine the compensation signal based on the noise signal, the first position, and the second position.

[0107] In the embodiment of the present application, the compensation signal is used to reproduce the signal portion of the input signal distorted by the finger touching the touch screen, that is, the input signal contains redundant signals due to the finger touching the touch screen, causing the input signal to be distorted, thereby causing the output signal to be distorted, and the compensation signal is the redundant signal in the input signal. The compensation signal is related to the first position where the stylus touches the touch screen and the second position where the finger touches the touch screen. Based on this, the compensation sensing unit determines the compensation signal through the first position and the second position.

[0108] Specifically, the compensation sensing unit can receive an input signal and determine the first position according to the input signal, and the determination method is not limited here. Exemplarily, a first training signal and a first marked position can be obtained, and the first training signal is a signal obtained when the stylus and the finger touch the touch screen at the same time, and the first marked position is the position where the stylus touches the touch screen. The first training signal is input into the neural network model to obtain a first predicted position, and the neural network model is trained using the first predicted position and the first marked position to obtain a first model. The input signal is input into the first model to obtain the first position. The structure, size, etc. of the first model are not limited here.

[0109] The input signal can be an analog signal or a digital signal. Figure 8 As shown, the compensation sensing unit includes a first analog-to-digital converter, which converts the continuously changing input signal into a discrete input signal, and then determines the first position based on the discrete input signal.

[0110] The compensation sensing unit can receive a noise signal and determine the second position based on the noise signal, and the determination method is not limited here. Exemplarily, a second training signal and a second marked position can be obtained, and the second training signal is a signal generated by the compensation sensing unit when the stylus and the finger simultaneously contact the touch screen and obtain the signal, and the second marked position is the position where the finger contacts the touch screen. The second training signal is input into the neural network model to obtain a second predicted position, and the neural network model is trained using the second predicted position and the second marked position to obtain a second model. The input signal is input into the second model to obtain the second position. The structure, size, etc. of the second model are not limited here.

[0111] The noise signal can be an analog signal or a digital signal. Figure 8As shown, the compensation sensing unit further includes a second analog-to-digital converter, through which the continuously changing noise signal is converted into a discrete noise signal, and then the second position is determined based on the discrete noise signal.

[0112] The compensation sensing unit is further used to determine a compensation signal according to the (discrete) noise signal, the first position and the second position. The determination method is not limited here. For example, if the distance between the first position and the second position is greater than a threshold, the noise signal is reduced to obtain a compensation signal; if the distance between the first position and the second position is equal to the threshold, the noise signal is equal to the compensation signal; if the distance between the first position and the second position is less than the threshold, the noise signal is increased to obtain a compensation signal.

[0113] Optionally, when determining the compensation signal according to the noise signal, the first position and the second position, the compensation sensing unit is specifically used to: determine a compensation coefficient according to the first position and the second position, and determine the compensation signal according to the compensation coefficient and the noise signal.

[0114] like Figure 8 As shown, the proportional coefficient Kp is determined according to the first position and the second position, and the determination method is not limited here. For example, the first position and the second position are coordinate data, including a horizontal coordinate and a vertical coordinate. The horizontal coordinate of the first position is divided by the horizontal coordinate of the second position to obtain a first result, and the vertical coordinate of the first position is divided by the vertical coordinate of the second position to obtain a second result, and the mean between the first result and the second result is calculated to obtain the proportional coefficient Kp. Alternatively, the distance between the first position and the second position is mapped to the proportional coefficient. Next, the compensation sensing unit determines the compensation signal according to the proportional coefficient Kp and the noise signal, and the determination method is not limited here. For example, the compensation sensing unit multiplies the proportional coefficient Kp by the noise signal to obtain the compensation signal. Alternatively, the compensation sensing unit multiplies the proportional coefficient Kp by the noise signal to obtain a multiplication result, and determines the compensation signal according to the multiplication result and the input signal.

[0115] Since the size of the compensation signal depends on the first position where the stylus pen contacts the touch screen and the second position where the finger contacts the touch screen, the first position and the second position are calculated, the proportional coefficient Kp is calculated based on the first position and the second position, and the compensation signal is determined by applying the proportional coefficient, so that the compensation signal is more in line with the actual situation and has higher accuracy.

[0116] The compensation sensing unit is used to transmit a compensation signal to the control processor so that the control processor acquires the compensation signal. In addition, the signal sensing unit is used to transmit an input signal to the control processor so that the control processor acquires the input signal. The control processor is used to correct the input signal according to the compensation signal to obtain a correction signal.

[0117] Optionally, the control processor subtracts the compensation signal from the input signal to obtain a correction signal. As shown in Table 1 below, Table 1 shows the signal values ​​of various signals that change with position, and these signals include: a standard signal, an input signal to be corrected, a noise signal, a compensation signal, and a correction signal. Among them, the standard signal is the input signal obtained by the signal sensing unit when only the stylus pen contacts the touch screen. The input signal to be corrected is the input signal obtained by the signal sensing unit when the stylus pen and the finger contact the touch screen at the same time. The noise signal is the signal generated by the compensation sensing unit. The compensation signal is a signal determined by the compensation sensing unit based on the noise signal. The correction signal is the signal obtained by subtracting the compensation signal from the input signal to be corrected.

[0118] The data in Table 1 are explained below using the standard signal as an example. In this example, the position where the stylus touches the touch screen is recorded as the standard position. In the case where only the stylus touches the touch screen, each position of the touch screen will correspond to a signal value, and the standard signal includes these signal values. Optionally, the signal value is a numerical value obtained by ADC conversion, which is used to reflect the strength of the signal. In general, the closer the position corresponding to the signal value is to the standard position, the larger the signal value. Based on this, for the standard signal in Table 1, the position corresponding to the signal value "370" is closest to the standard position. The signal values ​​on the right side of the signal value "370", namely: "350", "40", "0", "0", "0", "0", "0", "0", the distance between the positions corresponding to these signal values ​​and the standard position gradually increases. Similarly, the signal values ​​on the left side of the signal value "370", namely: "300", "100", "0", "0", "0", "0", "0", the distance between the positions corresponding to these signal values ​​and the standard position also gradually increases. It can be understood that the data of other signals in Table 1 are similar to the data of the standard signal, and will not be repeated here one by one.

[0119] Table 1

[0120]

[0121] According to the data in Table 1, we can get Fig. 9 The multiple line graphs shown in the figure. The horizontal coordinates of each line graph are positions, and the vertical coordinates are signal values. In other words, Fig. 9 (1) in FIG. 1 shows the variation trend of the signal value of the input signal to be corrected with position, and also shows the variation trend of the signal value of the standard signal with position. Fig. 9 (2) in FIG. 1 shows the variation trend of the signal value of the compensation signal with position. Fig. 9 (3) in FIG. 1 shows the variation trend of the signal value of the standard signal with the position, and also shows the variation trend of the signal value of the correction signal with the position.

[0122] From Table 1 and Fig. 9 It can be seen that when the stylus and the finger touch the touch screen at the same time, the input signal is distorted compared to the standard signal. Based on this, the touch chip first generates a noise signal, and determines a compensation signal based on the noise signal. The compensation signal is the difference between the input signal to be corrected and the standard signal. After that, the input signal to be corrected is subtracted from the compensation signal to obtain a correction signal. The correction signal can represent the signal obtained when only the stylus touches the touch screen. In this case, the correction signal is consistent with the standard signal, there is no signal distortion, and the accuracy is high.

[0123] In the case where the stylus and the finger simultaneously contact the touch screen to obtain the input signal, the accuracy of the input signal is improved by timely correcting the input signal, so that the touch chip can effectively understand the interaction between the finger and the stylus, so that it can independently process the signals of different input modes. The touch chip of the embodiment of the present application is of high value in graphic design, electronic document creation, games and other applications that require precise input, so that users can seamlessly switch or use the stylus and finger at the same time without any adjustment. The embodiment of the present application generates a compensation signal through a compensation sensing unit to correct the input signal through the compensation signal, and the increase in hardware burden is small. In other words, with an appropriate increase in the hardware burden, the touch chip can effectively process data, minimize the overall performance degradation of the device, and ensure user experience.

[0124] The control processor is also used to determine the contact position between the stylus pen and the touch screen based on the correction signal. Since the accuracy of the correction signal is relatively high, the control processor can accurately determine the contact position between the stylus pen and the touch screen according to the correction signal. The determination method is not limited here. For example, when the stylus pen contacts the touch screen, it only contacts an area of ​​the touch screen, and the area corresponds to the correction signal, and there is no correction signal in the remaining area. Based on this, the control processor can determine the contact position according to the area corresponding to the correction signal.

[0125] The touch driver will automatically generate a compensation signal when the stylus and the finger contact the touch screen at the same time and obtain the input signal, and correct the input signal according to the compensation signal to obtain a correction signal, so that the correction signal can represent the signal generated by the stylus contacting the touch screen, with high accuracy, and reduce the distortion of the input signal. Subsequently, the contact position of the stylus and the touch screen can be accurately determined based on the correction signal, and the input accuracy of the stylus can be improved, thereby improving the user experience.

[0126] The present application also provides a signal processing method. The signal processing method can be Figure 1 , Figure 7-Figure 8 Any of the touch control chips shown in the figure is executed, and the flowchart of the method is as follows Fig.10As shown, it includes steps 1001 to 1004.

[0127] In step 1001, an input signal is obtained.

[0128] The signal sensing unit can obtain input signals when the stylus pen touches the touch screen, or when the finger touches the touch screen, or when both the stylus pen and the finger touch the touch screen at the same time. The process of the signal sensing unit obtaining input signals can be found in the above description of the touch chip, which will not be repeated here.

[0129] In step 1002, when the input signal is obtained when the stylus and the finger contact the touch screen simultaneously, a compensation signal is generated, the compensation signal represents the difference between the input signal and the standard signal, and the standard signal represents the signal generated when the stylus contacts the touch screen.

[0130] In the embodiment of the present application, when only the stylus or finger touches the touch screen, the noise has little effect on the output signal and does not affect the accuracy and linearity of the touch chip. However, when the stylus and the finger touch the touch screen at the same time, the input signal will be distorted, which will cause the output signal to be distorted, affecting the accuracy of the output result. Based on this, a compensation signal is generated by the compensation sensing unit to correct the distortion of the input signal. Among them, the process of generating the compensation signal can be referred to the above description of the touch chip, which will not be repeated here.

[0131] Optionally, the signal processing method of the embodiment of the present application further includes: classifying the input signal through a signal classification model to obtain a classification result; wherein the classification result represents any one of the following: the input signal is obtained when only the stylus touches the touch screen; the input signal is obtained when only the finger touches the touch screen; the input signal is obtained when the stylus and the finger touch the touch screen at the same time. The above steps are performed before step 1002.

[0132] The control processor can classify the input signal based on the machine learning algorithm and transmit the classification result to the compensation sensing unit. The process of classifying the input signal can refer to the above description of the touch chip, which will not be repeated here.

[0133] In a possible implementation, the input signal is classified by a signal classification model to obtain a classification result, including: filtering the input signal to obtain a filtered signal; and classifying the filtered signal by the signal classification model to obtain a classification result.

[0134] The input signal can be filtered by filtering technology to remove system noise in the input signal and obtain a filtered signal with higher accuracy. After that, the filtered signal can be classified based on a machine learning algorithm. For the process of filtering the input signal and the process of classifying the filtered signal, please refer to the above description of the touch chip, which will not be repeated here.

[0135] Optionally, generating the compensation signal includes: generating a noise signal, the noise signal representing the working noise of the stylus; and determining the compensation signal according to the noise signal and the input signal.

[0136] In the embodiment of the present application, the method of generating the noise signal is not limited here. For example, a noise function such as Gaussian noise or Poisson noise is set in the compensation sensor unit to generate the noise signal according to the function. Alternatively, generating the noise signal includes: generating a first signal, the frequency of the first signal is the working frequency of the stylus; modulating the first signal to obtain a second signal, the amplitude of the second signal represents the magnitude of the working noise; and adjusting the second signal to obtain the noise signal.

[0137] By generating a signal, modulating the signal and adjusting the signal, the signal gradually approaches the working noise of the stylus, thereby ensuring the accuracy of the noise signal. Optionally, adjusting the second signal to obtain the noise signal includes: adjusting the second signal according to at least one of the resistance or capacitance to obtain the noise signal. For the generation process of the noise signal, please refer to the above description of the touch chip, which will not be repeated here.

[0138] In an exemplary embodiment, a compensation signal is determined based on a noise signal and an input signal, including: calculating a first position where the stylus touches the touch screen based on the input signal; calculating a second position where the finger touches the touch screen based on the noise signal; and determining the compensation signal based on the noise signal, the first position, and the second position.

[0139] In the embodiment of the present application, the method for determining the compensation signal is not limited herein. Exemplarily, a function is set for the compensation sensing unit, and the compensation signal is determined based on the noise signal and the input signal using the function. Alternatively, the compensation signal is determined based on the noise signal, the first position, and the second position, including: determining a compensation coefficient based on the first position and the second position, and determining the compensation signal based on the compensation coefficient and the noise signal. Optionally, the time difference between the acquisition time of the compensation signal and the acquisition time of the input signal is not greater than the time difference threshold. Among them, for the determination process of the compensation signal, please refer to the above description of the touch chip, which will not be repeated here.

[0140] In step 1003, the input signal is corrected according to the compensation signal to obtain a corrected signal.

[0141] The control processor subtracts the compensation signal from the input signal to obtain a correction signal. For the content of the correction signal, please refer to the above description of the touch chip, which will not be repeated here.

[0142] In step 1004 , the contact position between the stylus pen and the touch screen is determined based on the calibration signal.

[0143] Since the calibration signal has high accuracy, the control processor can accurately determine the contact position between the stylus and the touch screen according to the calibration signal. The method for determining the contact position is not limited here, and can refer to the above description of the touch chip, which will not be repeated here.

[0144] In summary, the signal processing method provided in the embodiment of the present application will automatically generate a compensation signal when the stylus and the finger contact the touch screen at the same time to obtain the input signal, and correct the input signal according to the compensation signal to obtain a correction signal, so that the correction signal can represent the signal generated by the stylus contacting the touch screen. The signal processing method has high accuracy and reduces the distortion of the input signal. Subsequently, the contact position of the stylus and the touch screen can be accurately determined based on the correction signal, and the input accuracy of the stylus can be improved, thereby improving the user experience.

[0145] The present application embodiment provides an electronic device, the electronic device comprising the above Figure 1 , Figure 7-Figure 8 Any of the touch control chips shown, the touch control chip is used to execute Fig.10 The signal processing method shown.

[0146] Exemplarily, the electronic device may be any device with a display function, and may be any terminal. Optionally, the terminal may be any electronic product that can interact with a user through one or more methods such as a keyboard, a touch pad, a touch screen, a remote control, voice interaction, or a handwriting device, such as a PC (Personal Computer), a mobile phone, a smart phone, a PDA (Personal Digital Assistant), a wearable device, a PPC (Pocket PC), a tablet computer, a smart car machine, a smart TV, etc.

[0147] The present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one instruction, which is loaded and executed by a processor to implement Fig.10 The signal processing method shown.

[0148] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions. For example, the first analog signal involved in this application is obtained with full authorization.

[0149] It should be understood that the "plurality" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0150] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A touch chip, characterized in that: The touch control chip includes a touch control driver; The touch driver is used to obtain an input signal, and when the input signal is obtained when the stylus pen and the finger contact the touch screen at the same time, generate a compensation signal, wherein the compensation signal represents a difference between the input signal and a standard signal, and the standard signal represents a signal generated when the stylus pen contacts the touch screen; The touch control driver is further configured to correct the input signal according to the compensation signal to obtain a correction signal, and determine a contact position between the stylus pen and the touch screen based on the correction signal.

2. The touch control chip according to claim 1, characterized in that: The touch control driver includes a signal sensing unit, a compensation sensing unit and a control processor; The signal sensing unit is used to obtain the input signal and transmit the input signal to the control processor; The compensation sensing unit is used to generate the compensation signal and transmit the compensation signal to the control processor when the input signal is obtained when the stylus pen and the finger contact the touch screen at the same time; The control processor is used to correct the input signal according to the compensation signal to obtain the correction signal, and determine the contact position between the stylus pen and the touch screen based on the correction signal.

3. The touch control chip according to claim 2, characterized in that: The compensation sensing unit is specifically used to generate the compensation signal: A noise signal is generated, and the compensation signal is determined according to the noise signal and the input signal, wherein the noise signal represents the working noise of the stylus pen.

4. The touch control chip according to claim 3, characterized in that: The compensation sensing unit includes a frequency modulator, an amplitude modulator and a regulator; The frequency modulator is used to generate a first signal and transmit the first signal to the amplitude modulator, wherein the frequency of the first signal is the working frequency of the stylus; The amplitude modulator is used to modulate the first signal to obtain a second signal, and transmit the second signal to the regulator, wherein the amplitude of the second signal represents the magnitude of the working noise; The regulator is used to regulate the second signal to obtain the noise signal.

5. The touch control chip according to claim 3, characterized in that: When determining the compensation signal according to the noise signal and the input signal, the compensation sensing unit is specifically used to: A first position where the stylus touches the touch screen is calculated according to the input signal, a second position where the finger touches the touch screen is calculated according to the noise signal, and the compensation signal is determined according to the noise signal, the first position and the second position.

6. The touch control chip according to claim 5, characterized in that: When determining the compensation signal according to the noise signal, the first position and the second position, the compensation sensing unit is specifically used to: A compensation coefficient is determined according to the first position and the second position, and the compensation signal is determined according to the compensation coefficient and the noise signal.

7. The touch control chip according to any one of claims 2 to 6, characterized in that: The control processor is further used to classify the input signal through a signal classification model to obtain a classification result, and send the classification result to the compensation sensing unit; The classification result represents any of the following: The input signal is obtained when only the stylus pen contacts the touch screen; The input signal is obtained when only the finger contacts the touch screen; The input signal is acquired when the stylus pen and the finger contact the touch screen simultaneously.

8. The touch control chip according to claim 7, characterized in that: When the control processor classifies the input signal through the signal classification model to obtain a classification result, it is specifically used to: The input signal is filtered to obtain a filtered signal, and the filtered signal is classified using the signal classification model to obtain a classification result.

9. A signal processing method, characterized in that: The method comprises: Get input signal; In the case where the input signal is obtained when the stylus pen and the finger contact the touch screen at the same time, generating a compensation signal, the compensation signal representing the difference between the input signal and a standard signal, the standard signal representing the signal generated when the stylus pen contacts the touch screen; Correcting the input signal according to the compensation signal to obtain a correction signal; A contact position between the stylus pen and the touch screen is determined based on the correction signal.

10. The method according to claim 9, characterized in that The generating of the compensation signal comprises: generating a noise signal, wherein the noise signal represents the working noise of the stylus; The compensation signal is determined according to the noise signal and the input signal.

11. The method according to claim 10, characterized in that The generating of the noise signal comprises: generating a first signal, wherein the frequency of the first signal is the operating frequency of the stylus; Modulating the first signal to obtain a second signal, wherein the amplitude of the second signal represents the magnitude of the working noise; The second signal is adjusted to obtain the noise signal.

12. The method according to claim 10, characterized in that The step of determining the compensation signal according to the noise signal and the input signal comprises: Calculating a first position where the stylus touches the touch screen according to the input signal; Calculating a second position where the finger contacts the touch screen according to the noise signal; The compensation signal is determined according to the noise signal, the first position and the second position.

13. The method according to claim 12, characterized in that The step of determining the compensation signal according to the noise signal, the first position and the second position comprises: determining a compensation coefficient according to the first position and the second position; The compensation signal is determined according to the compensation coefficient and the noise signal.

14. The method according to any one of claims 9 to 13, characterized in that: The method further comprises: Classify the input signal through a signal classification model to obtain a classification result; The classification result represents any of the following: The input signal is obtained when only the stylus pen contacts the touch screen; The input signal is obtained when only the finger contacts the touch screen; The input signal is acquired when the stylus pen and the finger contact the touch screen simultaneously.

15. An electronic device, characterized in that: The electronic device comprises a touch screen and a touch control chip as claimed in any one of claims 1 to 8.

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