Touch control chip, display screen and electronic equipment

Abstract

The utility model provides a touch chip, a display screen and electronic equipment. The touch chip comprises a driving unit, a compensation unit and a plurality of recognition units, the compensation unit is electrically connected with the multiple recognition units, and the driving unit is electrically connected with the electrodes; the driving unit can generate a driving signal and send the driving signal to the electrode; the compensation unit can at least send compensation signals to the multiple identification units according to reference signals generated by the multiple identification units, the compensation signals sent to the multiple identification units are not completely the same, and the compensation signals are matched with reference signals and interference signals coupled to the electrodes. The reference signal is a reference signal generated by the identification unit when the electronic equipment is not touched; the recognition unit can receive the induction signals generated by the electrodes and generate recognition signals according to the induction signals and the compensation signals, and the recognition signals are used for touch detection. The touch chip provided by the utility model is relatively high in touch detection sensitivity.

Description

Technical Field

[0001] This application relates to the field of touch chip technology, and more particularly to a touch chip, a display screen, and an electronic device. Background Technology

[0002] Touch technology is a human-computer interaction method. Users interact with electronic devices by touching or gesturing on the touch area of ​​the electronic device. With the development of smart devices, touch technology has become the mainstream operation method for mobile phones and other electronic devices. Mobile phones and other electronic devices receive touch commands input by users on the display screen and recognize the corresponding touch operations according to the touch commands.

[0003] Currently, touch detection in electronic device displays uses an electrode mutual capacitance scheme, which detects touch by detecting changes in the mutual capacitance between electrodes after a finger touches the screen.

[0004] However, when using the mutual capacitance scheme of electrodes for touch detection, the display signal used to drive the display screen to display the image is coupled to the electrodes, causing signal interference to the touch detection and resulting in low touch detection sensitivity. Utility Model Content

[0005] In view of this, embodiments of this application provide a touch chip, a display screen, and an electronic device to at least partially solve the above-mentioned problems.

[0006] According to a first aspect of the present application, a touch chip is provided, disposed in an electronic device, comprising: a driving unit, a compensation unit, and a plurality of recognition units; the recognition units are electrically connected to electrodes in the electronic device through pins of the touch chip, and different recognition units are electrically connected to different electrodes; the compensation unit is electrically connected to the plurality of recognition units respectively, and the driving unit is electrically connected to the electrodes; the driving unit is configured to generate a driving signal and send the driving signal to the electrodes; the compensation unit is configured to send a compensation signal to the plurality of recognition units respectively, at least according to a reference signal generated by the plurality of recognition units, wherein the compensation signals sent to the plurality of recognition units are not completely identical, and the compensation signal is matched with a reference signal and an interference signal coupled to the electrodes, the reference signal being the reference signal generated by the recognition units when the electronic device is not touched; the recognition unit is configured to receive a sensing signal generated by the electrodes and generate a recognition signal according to the sensing signal and the compensation signal, the recognition signal being used for touch detection.

[0007] In one possible implementation, the compensation unit includes: a feedback subunit and a plurality of weight subunits; the feedback subunit is electrically connected to the plurality of weight subunits respectively, the plurality of weight subunits are electrically connected to the plurality of identification units respectively, and different weight subunits are electrically connected to different identification units; the feedback subunit is used to generate a feedback signal based on the reference signal; the weight subunit is used to generate the compensation signal corresponding to the connected identification unit based at least on the feedback signal.

[0008] In one possible implementation, the electrodes include a plurality of lateral electrodes and a plurality of vertical electrodes, and the touch chip outputs the driving signal to one of the plurality of lateral electrodes and the plurality of vertical electrodes, and receives the sensing signal output by the other of the plurality of lateral electrodes and the plurality of vertical electrodes.

[0009] In one possible implementation, the identification unit includes: a first signal conversion unit and a second signal conversion unit; the first signal conversion unit is electrically connected to the electrode, the second signal conversion unit is electrically connected to the first signal conversion unit, and the weighting subunit is electrically connected to the first signal conversion unit; the first signal conversion unit is configured to receive the compensation signal and the sensing signal generated by the electrode, and convert the sensing signal into a first identification sub-signal based on the compensation signal; the second signal conversion unit is configured to generate the identification signal based on the first identification sub-signal.

[0010] In one possible implementation, the first signal conversion unit includes: a first amplifier, a first resistor, a second resistor, and a first capacitor; a first end of the first resistor is electrically connected to the electrode, a second end of the first resistor is connected to the negative input terminal of the first amplifier, a first end of the first capacitor is connected to the negative input terminal of the first amplifier, a second end of the first capacitor is connected to the output terminal of the first amplifier, a first end of the second resistor is connected to both the negative input terminal of the first amplifier and the first end of the first capacitor, a second end of the second resistor is connected to both the output terminal of the first amplifier and the second end of the first capacitor, and the positive input terminal of the first amplifier is connected to the weighting subunit.

[0011] In one possible implementation, the feedback subunit includes: a second amplifier, a fourth resistor, and a plurality of third resistors; the first end of the third resistor is electrically connected to the output of the first amplifier, different third resistors are connected to different first amplifiers, the second end of the third resistor is connected to the negative input of the second amplifier, the first end of the fourth resistor is connected to the negative input of the second amplifier, the second end of the fourth resistor is connected to the output of the second amplifier, the output of the second amplifier is connected to each of the weighting subunits, and the positive input of the second amplifier is used to receive a reference voltage.

[0012] In one possible implementation, the resistance of the fourth resistor is equal to the product of the ratio between the resistance of the third resistor and the number of the third resistors and the first gain coefficient.

[0013] In one possible implementation, the touch chip further includes: an analog unit; the analog unit is electrically connected to each of the weighting subunits; the analog unit is configured to generate an analog signal, wherein the analog signal is used to simulate a feedback signal generated by the feedback subunit based on the reference signal when the electronic device is not touched and there is no signal interference; the weighting subunit is configured to generate the compensation signal based on the analog signal and the feedback signal.

[0014] In one possible implementation, the simulation unit includes: a first simulation subunit and a second simulation subunit; the first simulation subunit is electrically connected to the second simulation subunit, and the second simulation subunit is electrically connected to the weighting subunit; the first simulation subunit is configured to generate a simulation sub-signal based on the driving signal, wherein the simulation sub-signal is used to simulate the reference signal generated by the identification unit when the electronic device is not touched and there is no interference signal; the second simulation subunit is configured to generate the simulation signal based on the simulation sub-signal.

[0015] In one possible implementation, the first analog subunit includes: a third amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor; the first terminal of the fifth resistor is electrically connected to the driving unit, the second terminal of the fifth resistor is connected to the first terminal of the second capacitor and the first terminal of the third capacitor respectively, the second terminal of the second capacitor is grounded, the second terminal of the third capacitor is connected to the first terminal of the fourth capacitor and the first terminal of the sixth resistor respectively, the second terminal of the fourth capacitor is grounded, the second terminal of the sixth resistor is connected to the first terminal of the seventh resistor, the second terminal of the seventh resistor is connected to the negative input terminal of the third amplifier, the first terminal of the fifth capacitor is connected to the negative input terminal of the third amplifier, the second terminal of the fifth capacitor is connected to the output terminal of the third amplifier, the first terminal of the eighth resistor is connected to the first terminal of the fifth capacitor and the negative input terminal of the third amplifier respectively, the second terminal of the eighth resistor is connected to the second terminal of the fifth capacitor and the output terminal of the third amplifier respectively, the positive input terminal of the third amplifier is connected to the second analog subunit, and the output terminal of the third amplifier is connected to the second analog subunit.

[0016] In one possible implementation, the second analog subunit includes: a fourth amplifier, a ninth resistor, and a tenth resistor; the first end of the ninth resistor is connected to the output of the third amplifier, the second end of the ninth resistor is connected to the negative input of the fourth amplifier, the first end of the tenth resistor is connected to the negative input of the fourth amplifier, the second end of the tenth resistor is connected to the output of the fourth amplifier, the output of the fourth amplifier is connected to the positive input of the third amplifier and the weighting subunit, and the positive input of the fourth amplifier is used to receive the reference voltage.

[0017] In one possible implementation, the resistance of the tenth resistor is equal to the product of the resistance of the ninth resistor and the first gain coefficient.

[0018] In one possible implementation, the resistance values ​​of the fifth resistor and the sixth resistor are equal to the product of the resistance value of the electrode and the second gain coefficient; the capacitance values ​​of the second capacitor and the fourth capacitor are equal to the ratio of the capacitance value of the electrode to the second gain coefficient; the capacitance value of the third capacitor is equal to the ratio of the mutual capacitance between the lateral electrode and the longitudinal electrode to the second gain coefficient; the resistance value of the seventh resistor is equal to the product of the resistance value of the first resistor and the second gain coefficient; the resistance value of the eighth resistor is equal to the product of the resistance value of the second resistor and the second gain coefficient; and the capacitance value of the fifth capacitor is equal to the ratio of the capacitance value of the first capacitor to the second gain coefficient.

[0019] In one possible implementation, the weighting subunit includes an eleventh resistor and a twelfth resistor; the first end of the eleventh resistor is connected to the analog unit, the first end of the twelfth resistor is connected to the feedback subunit, and the second end of the eleventh resistor, after being connected to the second end of the twelfth resistor, is connected to the non-inverting input of the first amplifier; the weighting subunit is used to adjust the weight of the analog signal through the eleventh resistor and to adjust the weight of the feedback signal through the twelfth resistor, and the second ends of the eleventh resistor and the twelfth resistor serve as the output terminals of the weighting subunit to output the compensation signal.

[0020] In one possible implementation, the second signal conversion unit includes: a differential amplification subunit, a low-pass filter subunit, a buffer subunit, and an analog-to-digital converter; the differential amplification subunit is electrically connected to the first signal conversion unit, the low-pass filter subunit is electrically connected to the differential amplification subunit, the buffer subunit is electrically connected to the low-pass filter subunit, and the analog-to-digital converter is electrically connected to the buffer subunit; the differential amplification subunit is used to differentially amplify the first identification sub-signal to obtain a second identification sub-signal; the low-pass filter subunit is used to low-pass filter the second identification sub-signal to obtain a third identification sub-signal; the buffer subunit and the analog-to-digital converter are used to generate the identification signal based on the third identification sub-signal.

[0021] According to a second aspect of the embodiments of this application, a display screen is provided, including electrodes and a touch chip as described in the first aspect.

[0022] According to a third aspect of the embodiments of this application, an electronic device is provided, including a display screen as described in the second aspect.

[0023] According to the embodiment of this application, the touch chip includes a driving unit, a compensation unit, and multiple recognition units. The compensation unit can send compensation signals to the multiple recognition units respectively based on reference signals generated by the multiple recognition units. The recognition units can generate recognition signals based on the compensation signals and the sensing signals generated by the electrodes. Thus, the touch chip can perform touch detection based on the recognition signals. Since the compensation signals match the reference signals and the interference signals coupled to the electrodes, the compensation signals can cancel out the interference signals coupled to the electrodes and the reference signals in the sensing signals. Since the compensation signals sent to the multiple recognition units are not completely identical, the strength of the compensation signals can be adjusted so that the recognition units receive compensation signals with corresponding signal interference strengths. This can be applied to cancel out signal interference with different signal strengths received in different electrodes, improving the signal interference cancellation effect and thus improving the sensitivity of touch detection. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 This is a schematic diagram of a touch chip provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of another touch chip provided in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of an identification unit provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of a first signal conversion unit provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of a compensation unit provided in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of a touch chip including an analog unit provided in an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of a simulation unit provided in an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of a first analog subunit provided in an embodiment of this application;

[0033] Figure 9 This is a schematic diagram of a second simulation subunit provided in an embodiment of this application;

[0034] Figure 10 This is a schematic diagram of a weighted subunit provided in an embodiment of this application;

[0035] Figure 11 This is a schematic diagram of a second signal conversion unit provided in an embodiment of this application;

[0036] Figure 12 This is a schematic diagram of a display screen provided in an embodiment of this application;

[0037] Figure 13 This is a schematic diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0039] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0040] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0041] As mentioned earlier, touch technology is a human-computer interaction method. Users interact with electronic devices by touching or gesturing on the touch area. With the development of smart devices, touch technology has become the mainstream operating method for mobile phones and other electronic devices. Mobile phones and other electronic devices receive touch commands input by users on the display screen and recognize the corresponding touch operations based on the commands. Currently, touch detection in electronic device display screens uses an electrode mutual capacitance scheme, which detects touch by detecting changes in the mutual capacitance between electrodes after a finger touches the screen. However, when using the electrode mutual capacitance scheme for touch detection, the display signal used to drive the image displayed on the screen is coupled to the electrodes, causing signal interference to the touch detection and resulting in low touch detection sensitivity.

[0042] This application provides a touch chip, which includes a driving unit, a compensation unit, and multiple recognition units. The compensation unit can send compensation signals to the multiple recognition units respectively based on reference signals generated by the multiple recognition units. The recognition units can generate recognition signals based on the compensation signals and the sensing signals generated by the electrodes. Thus, the touch chip can perform touch detection based on the recognition signals. Since the compensation signals match the reference signals and the interference signals coupled to the electrodes, the compensation signals can cancel out the interference signals coupled to the electrodes and the reference signals in the sensing signals. Since the compensation signals sent to the multiple recognition units are not completely identical, the strength of the compensation signals can be adjusted so that the recognition units receive compensation signals with corresponding signal interference strengths. This can be applied to cancel out signal interference with different signal strengths received in different electrodes, improving the signal interference cancellation effect and thus improving the sensitivity of touch detection.

[0043] Figure 1 This is a schematic diagram of a touch chip provided in an embodiment of this application. The touch chip 100 is disposed in an electronic device, such as... Figure 1 As shown, the touch chip 100 includes a driving unit 101, a compensation unit 102, and multiple recognition units 103. The recognition units 103 are electrically connected to the electrodes 201 in the electronic device through the pins of the touch chip 100, and different recognition units 103 are electrically connected to different electrodes 201. The compensation unit 102 is electrically connected to multiple recognition units 103 respectively, and the driving unit 101 is electrically connected to the electrodes 201.

[0044] The driving unit 101 can generate a driving signal and send the driving signal to the electrode 201. The compensation unit 102 can send a compensation signal to the multiple recognition units 103 respectively, based on at least the reference signal generated by the multiple recognition units 103. The compensation signals sent to the multiple recognition units 103 are not completely the same. The compensation signal is matched with a reference signal and an interference signal coupled to the electrode 201. The reference signal is the reference signal generated by the recognition unit 103 when the electronic device is not touched. The recognition unit 103 can receive the sensing signal generated by the electrode and generate a recognition signal based on the sensing signal and the compensation signal. The recognition signal is used for touch detection.

[0045] The touch chip 100 includes multiple recognition units 103. The multiple recognition units 103 are electrically connected to multiple electrodes 201 in the electronic device through the pins of the touch chip 100. Different recognition units 103 are electrically connected to different electrodes 201. The driving unit 101 can generate a driving signal. In one example, the driving signal can be a square wave signal, a sine wave signal, a trapezoidal wave signal, etc. After generating the driving signal, the driving unit 101 sends the driving signal to the electrode 201.

[0046] After receiving a driving signal, electrode 201 can generate a sensing signal in response to the driving signal. In one example, electrode 201 can generate a sensing signal through mutual capacitance in response to the driving signal. During the generation of the sensing signal by electrode 201, interference signals are coupled to electrode 201, causing signal interference in the sensing signal. It should be understood that the main source of signal interference is the display driving signal of the electronic device driving the display screen. When the electronic device drives the display screen, the pixels in the display screen are refreshed line by line, and the signal interference experienced by electrodes 201 located at different positions is different. Based on the above principle, the touch chip 100 includes a compensation unit 102, which can generate a compensation signal. The signal strength of the compensation signal generated by the compensation unit 102 can correspond to the strength of the signal interference experienced by the electrode 201 corresponding to the recognition unit 103 connected to the weighting subunit 1022. That is, the compensation signal matches the reference signal and the interference signal coupled to the electrode 201.

[0047] It should be understood that since the electrodes 201 located at different positions are subject to different signal interferences, the signal interference in the sensing signals received by different identification units 103 is different. If different identification units 103 receive compensation signals of the same signal strength, at least some identification units 103 will not be able to cancel the interference signals coupled to the electrodes 201 through the compensation signals. Therefore, the compensation signals sent by the compensation unit 102 to multiple identification units 103 are not completely the same. The compensation signals can match the signal interference received by the electrodes 201 connected to each identification subunit, thereby canceling the interference signals coupled to the electrodes 201 through the compensation signals.

[0048] The recognition unit 103 can generate a recognition signal based on the sensing signal and the compensation signal generated by the electrode 201. The touch chip 100 can perform touch detection based on the recognition signal. Optionally, the recognition unit 103 can cancel the signal interference included in the sensing signal based on the compensation signal, and then convert the sensing signal after canceling the interference into a recognition signal, thereby improving the signal-to-noise ratio of the recognition signal.

[0049] It should be noted that when electrode 201 uses mutual capacitance for touch detection, when the finger is not touched, due to the mutual capacitance between the transmitting electrode and the receiving electrode, when the transmitting electrode receives the driving signal sent by the touch chip 100, the receiving electrode will generate a first sensing signal. The first sensing signal is the base signal generated by the mutual capacitance between the transmitting electrode and the receiving electrode. When the finger touches the electrode, the mutual capacitance between the transmitting electrode and the receiving electrode changes, and the first sensing signal generated by the receiving electrode changes, generating a second sensing signal. The second sensing signal is the sum of the first sensing signal (base signal) and the signal change generated after the finger touches the electrode. Since the reference signal generated by the recognition unit 103 includes the base signal and signal interference regardless of whether the electronic device is touched by a finger, when the compensation unit 102 sends compensation signals to multiple recognition units 103 respectively based on the reference signals generated by multiple recognition units 103, the compensation signal can also cancel the base signal in the sensing signal generated by electrode 201. Therefore, the compensation signal matches the interference signal coupled to the electrode 201 and also matches the reference signal generated by electrode 201. Therefore, the identification unit 103 can cancel the interference signal coupled to the electrode 201 by using the compensation signal, and at the same time, it can also cancel the base signal.

[0050] In this embodiment, the touch chip 100 includes a driving unit 101, a compensation unit 102, and multiple recognition units 103. The compensation unit 102 can send compensation signals to the multiple recognition units 103 respectively based on reference signals generated by the multiple recognition units 103. The recognition units 103 can generate recognition signals based on the compensation signals and the sensing signals generated by the electrodes 201. Thus, the touch chip 100 can perform touch detection based on the recognition signals. Since the compensation signals match the reference signals and the interference signals coupled to the electrodes 201, the compensation signals can cancel out the interference signals coupled to the electrodes 201 and the reference signals in the sensing signals. Since the compensation signals sent to the multiple recognition units 103 are not completely identical, the strength of the compensation signals can be adjusted so that the recognition units 103 receive compensation signals with corresponding signal interference strengths. This can be applied to cancel out signal interference with different signal strengths received in different electrodes 201, improving the signal interference cancellation effect and thus improving the sensitivity of touch detection.

[0051] Figure 2 This is a schematic diagram of another touch chip provided in an embodiment of this application, as shown below. Figure 2As shown, the compensation unit 102 includes a feedback subunit 1021 and a plurality of weight subunits 1022. The feedback subunit 1021 is electrically connected to the plurality of weight subunits 1022 respectively, and the plurality of weight subunits 1022 are electrically connected to the plurality of identification units 103 respectively. Different weight subunits 1022 are electrically connected to different identification units 103. The feedback subunit 1021 can generate a feedback signal according to the reference signal, and the weight subunits 1022 can generate the compensation signal corresponding to the connected identification unit 103 based at least on the feedback signal.

[0052] The compensation unit 102 includes a feedback subunit 1021 and multiple weight subunits 1022. The multiple weight subunits 1022 are electrically connected to multiple identification units 103 respectively. The feedback subunit 1021 can generate a feedback signal, and the weight subunits 1022 can receive the feedback signal and generate a compensation signal based on the feedback signal. The signal strength of the compensation signal generated by the weight subunit 1022 can correspond to the intensity of the signal interference received by the electrode 201 corresponding to the identification unit 103 connected to the weight subunit 1022, that is, the compensation signal matches the interference signal coupled to the electrode 201.

[0053] It should be understood that the feedback subunit 1021 generates a feedback signal based on the reference signal generated by the multiple identification units 103. If the feedback signal is directly sent to the identification unit 103, each identification unit 103 will receive a feedback signal with the same signal strength. However, since the electrodes 201 located at different positions are subject to different signal interferences, the signal interference in the induced signals received by different identification units 103 will be different. If the feedback signal with the same signal strength is received, at least some identification units 103 will not be able to cancel the interference signal coupled to the electrode 201 through the feedback signal. Therefore, a weighting subunit 1022 is provided. The weighting subunit 1022 can adjust the signal strength of the feedback signal and generate a compensation signal based on the feedback signal. The compensation signal can match the signal interference received by the electrodes 201 connected to each identification subunit, thereby canceling the interference signal coupled to the electrode 201 through the compensation signal.

[0054] In this embodiment, the compensation unit 102 includes a feedback subunit 1021 and multiple weight subunits 1022. The feedback subunit 1021 can generate a feedback signal based on the reference signal. The weight subunits 1022 generate the compensation signal corresponding to the connected recognition unit 103 based at least on the feedback signal. Since the feedback signal is generated based on the reference signal generated by each recognition unit 103, and the reference signal is generated by the recognition unit 103 based on the sensing signal generated by the electrode 201, and the sensing signal includes the interference signal coupled to the electrode 201, the compensation signal generated based on the feedback signal can cancel the interference signal coupled to the electrode 201. Since different recognition units 103 correspond to different weight subunits 1022, the strength of the compensation signal can be adjusted by the weight subunits 1022 so that the recognition unit 103 receives the compensation signal with the corresponding signal interference strength. This can be applied to cancel the signal interference of different signal strengths received in different electrodes 201, improve the signal interference cancellation effect, and thus improve the sensitivity of touch detection.

[0055] In one possible implementation, electrode 201 includes a plurality of lateral electrodes and a plurality of vertical electrodes, and touch chip 100 outputs a drive signal to one of the plurality of lateral electrodes and a plurality of vertical electrodes, and receives a sensing signal output by the other of the plurality of lateral electrodes and a plurality of vertical electrodes.

[0056] One of the multiple horizontal electrodes and multiple vertical electrodes serves as the transmitting electrode. The driving unit 101 in the touch chip 100 outputs a driving signal to the transmitting electrode. The other of the multiple horizontal electrodes and multiple vertical electrodes serves as the receiving electrode and outputs a sensing signal. The recognition unit 103 connected to the receiving electrode receives the sensing signal and performs touch detection based on the sensing signal and the compensation signal.

[0057] In one example, drive signals can be alternately output to the horizontal and vertical electrodes. Specifically, the touch chip 100 can first output a drive signal to the horizontal electrode, obtain the X-axis coordinate of the finger touch position based on the sensing signal and compensation signal generated by the vertical electrode, and then output a drive signal to the vertical electrode, obtain the Y-axis coordinate of the finger touch position based on the sensing signal and compensation signal generated by the horizontal electrode. Alternatively, the Y-axis coordinate can be detected first and then the X-axis coordinate can be detected. In another example, drive signals can be output to either the horizontal or vertical electrode, and touch detection can be performed only based on the sensing signal generated by the horizontal or vertical electrode, that is, only the X-axis coordinate or Y-axis coordinate of the touch position can be detected. This is suitable for scenarios with low detection accuracy requirements. The specific detection method can be set as needed and is not limited here.

[0058] In this embodiment, electrode 201 includes multiple horizontal electrodes and multiple vertical electrodes. Touch chip 100 outputs a driving signal to one of the multiple horizontal electrodes and multiple vertical electrodes, and receives a sensing signal output by the other of the multiple horizontal electrodes and multiple vertical electrodes, thereby realizing touch detection through a mutual capacitance scheme.

[0059] Figure 3 This is a schematic diagram of an identification unit provided in an embodiment of this application, such as... Figure 3 As shown, the identification unit 103 includes a first signal conversion unit 1031 and a second signal conversion unit 1032. The first signal conversion unit 1031 is electrically connected to the electrode 201, the second signal conversion unit 1032 is electrically connected to the first signal conversion unit 1031, and the weighting subunit 1022 is electrically connected to the first signal conversion unit 1031. The first signal conversion unit 1031 can receive a compensation signal and an induction signal generated by the electrode 201, and convert the induction signal into a first identification sub-signal according to the compensation signal. The second signal conversion unit 1032 can generate an identification signal according to the first identification sub-signal.

[0060] In one example, the first signal conversion unit 1031 can be a trans-impedance amplifier (TIA) circuit. The TIA can convert the induced signal (current signal) transmitted by the electrode 201 into a first identification sub-signal (voltage signal) based on the compensation signal. The second signal conversion unit 1032 can be a post-processing circuit of the TIA. It can process the first identification sub-signal to generate an identification signal (digital signal). The touch chip 100 can perform touch detection based on the identification signal (digital signal).

[0061] Optionally, the reference signal is a first identification sub-signal generated by the first signal conversion unit 1031 based on the sensing signal.

[0062] In this embodiment, the identification unit 103 includes a first signal conversion unit 1031 and a second signal conversion unit 1032. The first signal conversion unit 1031 converts the induced signal (current signal) transmitted from the electrode 201 into a first identification sub-signal (voltage signal) based on a compensation signal. The second signal conversion unit 1032 generates an identification signal based on the first identification sub-signal, thus achieving signal conversion. Furthermore, since the first signal conversion unit 1031 converts the induced signal transmitted from the electrode 201 into the first identification sub-signal based on the compensation signal, the interference signal coupled to the electrode 201 can be canceled by the compensation signal, improving the signal-to-noise ratio of the first identification sub-signal.

[0063] Figure 4 This is a schematic diagram of a first signal conversion unit provided in an embodiment of this application, as shown below. Figure 4As shown, the first signal conversion unit 1031 includes a first amplifier D1, a first resistor R1, a second resistor R2, and a first capacitor C1. The first end of the first resistor R1 is electrically connected to the electrode 201, and the second end of the first resistor R1 is connected to the negative input terminal of the first amplifier D1. The first end of the first capacitor C1 is connected to the negative input terminal of the first amplifier D1, and the second end of the first capacitor C1 is connected to the output terminal of the first amplifier D1. The first end of the second resistor R2 is connected to both the negative input terminal of the first amplifier D1 and the first end of the first capacitor C1, and the second end of the second resistor R2 is connected to both the output terminal of the first amplifier D1 and the second end of the first capacitor C1. The positive input terminal of the first amplifier D1 is connected to the weighting subunit 1022.

[0064] The second resistor R2 can serve as the feedback resistor for the first amplifier D1. The feedback resistor (second resistor R2), the first capacitor C1, and the first amplifier D1 can form a transimpedance amplifier circuit TIA. The negative input terminal of the first amplifier D1 is connected to the electrode 201 through the first resistor R1, and the positive input terminal of the first amplifier D1 is connected to the weighting subunit 1022. Due to the characteristics of the transimpedance amplifier circuit, the voltage at the negative input terminal will be pulled up or down to be the same as that at the positive input terminal. This is equivalent to the first amplifier D1 inverting the compensation signal output by the weighting subunit 1022 and inputting it into the electrode 201 to cancel the reference signal and the interference signal coupled to the electrode 201. Furthermore, the transimpedance amplifier circuit can convert the induced signal (current signal) generated by the electrode 201 into the first identification sub-signal (voltage signal).

[0065] In this embodiment, the second resistor R2 can serve as the feedback resistor of the first amplifier D1. The first resistor R1, the feedback resistor (second resistor R2), the first capacitor C1, and the first amplifier D1 can form a transimpedance amplifier circuit TIA. The transimpedance amplifier circuit TIA can convert the induced signal (current signal) generated by the electrode 201 into a first identification sub-signal (voltage signal). According to the circuit characteristics of TIA, the second compensation sub-signal input through the non-inverting input terminal of the first amplifier D1 can cancel the interference signal coupled to the electrode 201. Thus, the first identification signal can be generated based on the induced signal with less interference, thereby improving the signal-to-noise ratio of the first identification sub-signal and improving the touch detection sensitivity.

[0066] Figure 5 This is a schematic diagram of a feedback subunit provided in an embodiment of this application, as shown below. Figure 5As shown, the feedback subunit 1021 includes a second amplifier D2, a fourth resistor R4, and multiple third resistors R3. The first end of the third resistor R3 is electrically connected to the output terminal of the first amplifier D1. Different third resistors R3 are connected to different first amplifiers D1. The second end of the third resistor R3 is connected to the negative input terminal of the second amplifier D2. The first end of the fourth resistor R4 is connected to the negative input terminal of the second amplifier D2. The second end of the fourth resistor R4 is connected to the output terminal of the second amplifier D2. The output terminal of the second amplifier D2 is connected to each weight subunit 1022. The positive input terminal of the second amplifier D2 is used to receive the reference voltage Vcm.

[0067] Feedback subunit 1021 includes a second amplifier D2, multiple third resistors R3, and a fourth resistor R4. The third resistors R3 are connected to the output terminal of the first amplifier D1 in the first signal conversion unit 1031. The voltage signal output from the output terminal of the first amplifier D1 in each first signal conversion unit 1031 is converted into a current signal through the third resistor R3 corresponding to that first signal conversion unit 1031. The third resistor R3 transmits the current signal to the negative input terminal of the second amplifier D2. The second amplifier D2 and the fourth resistor R4 form a transimpedance amplifier circuit. The non-inverting input terminal of the second amplifier D2 receives a reference voltage Vcm. In one example, the reference voltage Vcm can be a common-mode voltage. The second amplifier D2 generates a feedback signal based on the reference voltage Vcm and the current signals transmitted by each third resistor R3, and sends the feedback signal to the weighting subunit 1022. The weighting subunit 1022 generates a compensation signal based on the feedback signal and sends the compensation signal to the non-inverting input terminal of the first amplifier D1.

[0068] It should be understood that since the negative input terminal of the second amplifier D2 is connected to the output terminal of the first amplifier D1 through the third resistor R3, and the output terminal of the second amplifier D2 is connected to the positive input terminal of the first amplifier D1 through the weighting subunit 1022, the second amplifier D2, the third resistor R3, the fourth resistor R4 and the weighting subunit 1022 can form a negative feedback circuit of the first signal conversion unit 1031. The signal generated by the first signal conversion unit 1031 can be fed back to the first amplifier D1 in the first signal conversion unit 1031 through the negative feedback circuit and the weighting subunit 1022, so that the interference signal coupled to the electrode 201 can be canceled by the compensation signal.

[0069] In this embodiment, the feedback subunit 1021 includes a second amplifier D2, a fourth resistor R4, and multiple third resistors R3. The third resistors R3 can convert the voltage signal output by the first amplifier D1 into a current signal and transmit it to the negative input terminal of the second amplifier D2. The second amplifier D2 and the fourth resistor R4 can generate a feedback signal based on the reference voltage Vcm input at the positive input terminal and the current signal input at the negative input terminal. Since the second amplifier D2, the third resistor R3, the fourth resistor R4, and the weighting subunit 1022 form the negative feedback circuit of the first signal conversion unit 1031, after the weighting subunit 1022 generates a compensation signal based on the feedback signal, the first signal conversion unit 1031 can cancel the reference signal and the interference signal coupled to the electrode 201 through the compensation signal. Thus, the first signal conversion unit 1031 can generate a first identification signal based on the sensing signal with less signal interference, thereby improving the signal-to-noise ratio of the first identification sub-signal and improving the touch detection sensitivity.

[0070] In one possible implementation, the resistance of the fourth resistor R4 is equal to the product of the ratio between the resistance of the third resistor R3 and the number of third resistors R3, and the first gain coefficient.

[0071] In one example, the resistance value of the fourth resistor R4 = A * the resistance value of the third resistor R3 / N, where N represents the number of third resistors R3. Since each first signal conversion unit 1031 is connected to a third resistor R3, the number of third resistors R3 is the number of first signal conversion units 1031. A represents the first gain coefficient.

[0072] It should be understood that the feedback subunit 1021 simultaneously receives the voltage signals output by each of the first signal conversion units 1031 through multiple third resistors R3. When the resistance value of the feedback resistor (fourth resistor R4) is linearly related to the resistance value of the third resistor R3 / N, a mean-value negative feedback circuit can be formed through the second amplifier D2 and the fourth resistor R4. The mean value of the voltage signals received from the multiple first signal conversion units 1031 is adjusted by the weighting subunit 1022 and then negatively fed back to each first signal conversion unit 1031. Specifically, the N third resistors R3 convert the voltage signals output by the N first signal conversion units 1031 into N current signals. The fourth resistor R4 serves as the feedback resistor for the second amplifier D2, receiving N current signals. Since it includes N weighted sub-units 1022 corresponding to the first signal conversion unit 1031, the feedback sub-unit 1021 outputs feedback signals to each weighted sub-unit 1022. The current signal corresponding to one weighted sub-unit 1022 among the N current signals is N current signals / N. Therefore, when the resistance value of the fourth resistor R4 is linearly related to the resistance value of the third resistor R3 / N, a feedback signal corresponding to the weighted sub-unit 1022 connected to one of the first signal conversion units 1031 can be generated based on the voltage signals transmitted by the N first signal conversion units 1031.

[0073] In this embodiment, the resistance value of the fourth resistor R4 is equal to the product of the ratio between the resistance value of the third resistor R3 and the number of third resistors R3 and the first gain coefficient. This can amplify the output signal of the first signal conversion unit 1031 received through the third resistor R3, thereby increasing the signal strength of the feedback signal. Furthermore, the feedback subunit 1021 can serve as the average negative feedback circuit for each of the first signal conversion units 1031. After generating the feedback signal, the compensation signal can be fed back to the first signal conversion unit 1031 through the weighting subunit 1022, thus realizing the negative feedback through the first signal conversion unit 1031.

[0074] Figure 6 This is a schematic diagram of a touch chip including an analog unit provided in an embodiment of this application, as shown below. Figure 6 As shown, the touch chip 100 also includes an analog unit 104, which is electrically connected to each weight subunit 1022. The analog unit 104 can generate an analog signal, wherein the analog signal is used to simulate the feedback signal generated by the feedback subunit 1021 based on the reference signal when the electronic device is not touched and there is no signal interference. The weight subunit 1022 can generate a compensation signal based on the analog signal and the feedback signal.

[0075] When electrode 201 uses mutual capacitance for touch detection, and there is no signal interference, when the finger is not touched, due to the mutual capacitance between the transmitting and receiving electrodes, when the transmitting electrode receives the drive signal sent by the touch chip 100, the receiving electrode generates a first sensing signal. The first sensing signal is a base signal generated by the mutual capacitance between the transmitting and receiving electrodes. When the finger touches the electrode, the mutual capacitance between the transmitting and receiving electrodes changes, and the first sensing signal generated by the receiving electrode changes, generating a second sensing signal. The second sensing signal is the sum of the first sensing signal (base signal) and the signal change generated after the finger touches the electrode. It should be understood that since the weighting subunit 1022 generates a compensation signal based on the feedback signal, the compensation signal is adjusted accordingly. The compensation signal matches the strength of the interference signal coupled to the electrode 201. Although this can improve the cancellation effect of the interference signal, since the compensation signal is obtained by enhancing or weakening the feedback signal, the weakening effect of the feedback signal on the base signal will be reduced after the compensation signal is generated. Therefore, the touch chip 100 also includes an analog unit 104. The analog unit 104 can generate an analog signal. The analog signal can simulate the feedback signal generated by the feedback subunit 1021 based on the reference signal when there is no interference. The weighting subunit 1022 can generate a compensation signal based on the analog signal and the feedback signal. The cancellation effect of the base signal is compensated by the analog signal. That is, the base signal and the interference signal can be canceled simultaneously by adjusting the weights of the analog signal and the feedback signal.

[0076] It should be understood that the signal interference in the sensing signal generated by electrode 201 is mainly due to the display signal being coupled into electrode 201. Since the analog signal is generated by analog unit 104 and not by electrode 201, the analog signal contains almost no signal interference.

[0077] In this embodiment, the touch chip 100 further includes an analog unit 104, which can generate an analog signal. The weighting subunit 1022 can generate a compensation signal based on the analog signal and the feedback signal. Since the analog signal can simulate the situation when the electronic device is not touched and there is no signal interference, the feedback subunit 1021 generates a feedback signal based on the reference signal. Therefore, by adjusting the weights of the analog signal and the feedback signal through the weighting subunit 1022, the base signal and the interference signal can be canceled out simultaneously by the compensation signal. This allows the recognition unit 103 to perform touch detection only based on the signal change caused by finger touch in the sensing signal, thereby improving the sensitivity of touch detection.

[0078] Figure 7 This is a schematic diagram of a simulation unit provided in an embodiment of this application, such as... Figure 7As shown, the simulation unit 104 includes a first simulation subunit 1041 and a second simulation subunit 1042. The first simulation subunit 1041 is electrically connected to the second simulation subunit 1042, and the second simulation subunit 1042 is electrically connected to the weighting subunit 1022. The first simulation subunit 1041 can generate a simulation sub-signal according to the driving signal. The simulation sub-signal is used to simulate the reference signal generated by the identification unit 103 when the electronic device is not touched and there is no signal interference. The second simulation subunit 1042 can generate a simulation signal according to the simulation sub-signal.

[0079] The simulation unit 104 includes a first simulation subunit 1041 and a second simulation subunit 1042. The first simulation subunit 1041 can simulate the electrode 201 and the first signal conversion unit 1031 connected to the electrode 201. The first simulation subunit 1041 can generate a simulation sub-signal according to the driving signal. The simulation sub-signal can simulate the situation when the electronic device is not touched and there is no signal interference. After the electrode 201 generates a sensing signal according to the driving signal, the first signal conversion unit 1031 generates a first identification signal according to the sensing signal, which is the reference signal generated by the identification unit 103 according to the sensing signal.

[0080] The second analog subunit 1042 can simulate the feedback subunit 1021. The second analog subunit 1042 receives analog sub-signals and generates analog signals based on the analog sub-signals. It can simulate the feedback subunit 1021 receiving reference signals and generating feedback signals based on the reference signals. Thus, the analog signals can simulate the feedback signals generated by the feedback subunit 1021 based on the reference signals when the electronic device is not touched and there is no signal interference.

[0081] In this embodiment, the simulation unit 104 includes a first simulation subunit 1041 and a second simulation subunit 1042. The first simulation subunit 1041 can simulate the electrode 201 and the first signal conversion unit 1031 connected to the electrode 201. The second simulation subunit 1042 can simulate the feedback subunit 1021. Thus, the simulation signals generated by the first simulation subunit 1041 and the second simulation subunit 1042 can simulate the feedback signal generated by the feedback subunit 1021 based on the reference signal when the electronic device is not touched and there is no signal interference.

[0082] Figure 8 This is a schematic diagram of a first analog subunit provided in an embodiment of this application, as shown below. Figure 8As shown, the first analog subunit 1041 includes: a third amplifier D3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. The first terminal of the fifth resistor R5 is electrically connected to the drive unit 101. The second terminal of the fifth resistor R5 is connected to the first terminals of both the second and third capacitors C2 and C3. The second terminal of the second capacitor C2 is grounded. The second terminal of the third capacitor C3 is connected to the first terminals of both the fourth and sixth capacitors C4 and R6. The second terminal of the fourth capacitor C4 is grounded. The second terminal of the sixth resistor R6 is connected to the first terminal of the seventh resistor R7. The first terminal is connected, the second terminal of the seventh resistor R7 is connected to the negative input terminal of the third amplifier D3, the first terminal of the fifth capacitor C5 is connected to the negative input terminal of the third amplifier D3, the second terminal of the fifth capacitor C5 is connected to the output terminal of the third amplifier D3, the first terminal of the eighth resistor R8 is connected to the first terminal of the fifth capacitor C5 and the negative input terminal of the third amplifier D3, the second terminal of the eighth resistor R8 is connected to the second terminal of the fifth capacitor C5 and the output terminal of the third amplifier D3, the positive input terminal of the third amplifier D3 is connected to the second analog subunit 1042, and the output terminal of the third amplifier D3 is connected to the second analog subunit 1042.

[0083] The first analog subunit 1041 can simulate electrode 201 and the first signal conversion unit 1031 connected to electrode 201. Specifically, the fifth resistor R5 can simulate the resistance of the transmitting electrode, the second capacitor C2 can simulate the capacitance of the transmitting electrode, the sixth resistor R6 can simulate the resistance of the receiving electrode, the fourth capacitor C4 can simulate the capacitance of the receiving electrode, and the third capacitor C3 can simulate the mutual capacitance between the transmitting electrode and the receiving electrode. The fifth resistor R5 is electrically connected to the driving unit 101. When the driving unit 101 outputs a driving signal, the fifth resistor R5 receives the driving signal and can simulate the transmitting electrode receiving the driving signal. The transmitting electrode and the receiving electrode, as well as the mutual capacitance between the transmitting electrode and the receiving electrode, can be simulated by the fifth resistor R5, the second capacitor C2, the third capacitor C3, the sixth resistor R6, and the fourth capacitor C4.

[0084] The second end of the seventh resistor R7 is connected to the negative input terminal of the third amplifier D3, which can simulate the connection of the second end of the first resistor R1 to the negative input terminal of the first amplifier D1. The fifth capacitor C5 can simulate the first capacitor C1. The eighth resistor R8, as the feedback resistor of the third amplifier D3, can simulate the second resistor R2 as the feedback resistor of the first amplifier D1. Thus, the seventh resistor R7, the third amplifier D3, the fifth capacitor C5, and the eighth resistor R8 are used to simulate the first signal conversion unit 1031. The negative input terminal of the third amplifier D3 is connected to the sixth resistor R6 through the seventh resistor R7, which can connect the first signal conversion unit 1031 to the receiving electrode. The positive input terminal of the third amplifier D3 is connected to the second analog subunit 1042, which can receive the analog signal generated by the second analog subunit 1042 and simulate the compensation signal transmitted by the weighting subunit 1022 received by the first signal conversion unit 1031. It should be understood that since the first analog subunit 1041 in the analog unit 104 is only used to simulate the first signal conversion unit 1031 when there is no signal interference on the electrode 201, since there is no signal interference, there is no need for the analog weight subunit 1022 to adjust the strength of the analog signal to match the signal interference received by the electrode 201 connected to the first signal conversion unit 1031. Therefore, the non-inverting input terminal of the third amplifier D3 directly receives the analog signal used for simulating the feedback signal, and there is no need to set up a circuit structure for simulating the weight subunit 1022.

[0085] In this embodiment, the first analog subunit 1041 includes: a third amplifier D3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. The fifth resistor R5, the second capacitor C2, the third capacitor C3, the sixth resistor R6, and the fourth capacitor C4 can simulate the mutual capacitance structure between the transmitting electrode and the receiving electrode. The seventh resistor R7, the eighth resistor R8, the fifth capacitor C5, and the third amplifier D3 can simulate the first signal conversion unit 1031. Thus, the analog sub-signal generated by the first analog subunit 1041 can simulate the first identification signal generated by the first signal conversion unit 1031 based on the first sensing signal after the electrode 201 generates a sensing signal according to the driving signal when the electronic device is not touched and there is no signal interference.

[0086] Figure 9 This is a schematic diagram of a second analog subunit provided in an embodiment of this application, as shown below. Figure 9As shown, the second analog subunit 1042 includes a fourth amplifier D4, a ninth resistor R9, and a tenth resistor R10. The first end of the ninth resistor R9 is connected to the output of the third amplifier D3, and the second end of the ninth resistor R9 is connected to the negative input of the fourth amplifier D4. The first end of the tenth resistor R10 is connected to the negative input of the fourth amplifier D4, and the second end of the tenth resistor R10 is connected to the output of the fourth amplifier D4. The output of the fourth amplifier D4 is connected to the positive input of the third amplifier D3 and the weight subunit 1022. The positive input of the fourth amplifier D4 is used to receive the reference voltage Vcm.

[0087] The fourth amplifier D4 can simulate the second amplifier D2 in the feedback subunit 1021. The ninth resistor R9 is connected to the output terminal of the third amplifier D3 in the first analog subunit 1041, simulating the electrical connection between the third resistor R3 in the feedback subunit 1021 and the output terminal of the first amplifier D1 in the first signal conversion unit 1031. The tenth resistor R10 serves as the feedback resistor for the fourth amplifier D4, simulating the feedback resistor R4 in the feedback subunit 1021 serving as the feedback resistor for the second amplifier D2. The non-inverting input terminal of the fourth amplifier D4 receives the reference voltage Vcm, simulating the connection between the non-inverting input terminal of the second amplifier D2 in the feedback subunit 1021 and the reference voltage Vcm. The reference voltage Vcm is received. The output terminal of the fourth amplifier D4 is connected to the non-inverting input terminal of the third amplifier D3. This can simulate the connection of the non-inverting input terminal of the second amplifier D2 in the feedback subunit 1021 to the non-inverting input terminal of the first amplifier D1 through the weighting subunit 1022. The principle is the same as above. Since the weighting subunit 1022 does not need to adjust the strength of the analog signal (the simulated feedback signal) to match the signal interference received by the electrode 201 connected to the first signal conversion unit 1031, the output terminal of the fourth amplifier D4 is directly connected to the non-inverting input terminal of the third amplifier D3. There is no need to set up a circuit structure for simulating the weighting subunit 1022.

[0088] It should be understood that since the first analog subunit 1041 only simulates one first signal conversion unit 1031, the second analog subunit 1042 only includes one ninth resistor R9 for simulating the third resistor R3.

[0089] In this embodiment, the second analog subunit 1042 includes a fourth amplifier D4, a ninth resistor R9, and a tenth resistor R10. The fourth amplifier D4 can simulate the second amplifier D2 in the feedback subunit 1021, the ninth resistor R9 can simulate the third resistor R3 in the feedback subunit 1021, and the tenth resistor R10 can simulate the fourth resistor R4 in the feedback subunit 1021. This enables the second analog subunit 1042 to simulate the feedback subunit 1021, thereby generating an analog signal based on the first analog subunit 1041 and the second analog subunit 1042 that simulates the feedback signal generated by the feedback subunit 1021 according to the reference signal when the electronic device is not touched and there is no signal interference.

[0090] In one possible implementation, the resistance of the tenth resistor R10 is equal to the product of the resistance of the ninth resistor R9 and the first gain coefficient.

[0091] Since the first analog subunit 1041 only simulates one first signal conversion unit 1031, the second analog subunit 1042 only includes one ninth resistor R9 to simulate the third resistor R3. That is, the second analog subunit 1042 only includes one ninth resistor R9. Since the ninth resistor R9 simulates the third resistor R3, the calculation formula applicable to the third resistor R3 and the fourth resistor R4 also applies to the tenth resistor R10 and the ninth resistor R9. That is, the resistance value of the fourth resistor R4 = A * the resistance value of the third resistor R3 / N, and the resistance value of the tenth resistor R10 = A * the resistance value of the ninth resistor R9 / N. Since there is only one ninth resistor R9, the resistance value of the tenth resistor R10 = A * the resistance value of the ninth resistor R9, where A is used to characterize the first gain coefficient.

[0092] In this embodiment, the resistance value of the tenth resistor R10 is equal to the product of the resistance value of the ninth resistor R9 and the first gain coefficient. The numerical relationship between the tenth resistor R10 and the ninth resistor R9 can be used to simulate the numerical relationship between the fourth resistor R4 and multiple third resistors R3 in the feedback subunit 1021. This allows the tenth resistor R10 to simulate the fourth resistor R4 in the feedback subunit 1021, and the ninth resistor R9 to simulate the third resistor R3 in the feedback subunit 1021. This allows the first simulation subunit 1041 to simulate the feedback subunit 1021.

[0093] In one possible implementation, the resistance values ​​of the fifth resistor R5 and the sixth resistor R6 are equal to the product of the average resistance value of electrode 201 and the second gain coefficient; the capacitance values ​​of the second capacitor C2 and the fourth capacitor C4 are equal to the ratio of the average capacitance value of electrode 201 to the second gain coefficient; the capacitance value of the third capacitor C3 is equal to the ratio of the average capacitance value of the mutual capacitance between the transverse and longitudinal electrodes to the second gain coefficient; the resistance value of the seventh resistor R7 is equal to the product of the resistance value of the first resistor R1 and the second gain coefficient; the resistance value of the eighth resistor R8 is equal to the product of the resistance value of the second resistor R2 and the second gain coefficient; and the capacitance value of the fifth capacitor C5 is equal to the ratio of the capacitance value of the first capacitor C1 to the second gain coefficient.

[0094] When the resistance of the resistor in the analog unit 104 is the product of the resistance of the corresponding resistor in the first signal conversion unit 1031 and the electrode 201 and the second gain coefficient, and the capacitance of the capacitor in the analog unit 104 is the ratio of the capacitance of the corresponding capacitor in the first signal conversion unit 1031 and the electrode 201 to the second gain coefficient, that is, when M represents the second gain coefficient, then the resistance of the fifth resistor R5 = the average value of the resistance of the electrode 201 * M, the resistance of the sixth resistor R6 = the average value of the resistance of the electrode 201 * M, the resistance of the seventh resistor R7 = the resistance of the first resistor R1 * M, the resistance of the eighth resistor R8 = the resistance of the second resistor R2 * M, the capacitance of the second capacitor C2 = the average value of the capacitance of the electrode 201 / M, the capacitance of the fourth capacitor C4 = the average value of the capacitance of the electrode 201 / M, the capacitance of the third capacitor C3 = the average value of the mutual capacitance / M, and the capacitance of the fifth capacitor C5 = the capacitance of the first capacitor C1 / M. At this point, according to the circuit characteristics, the output signal is completely consistent with the following conditions: the resistance of the fifth resistor R5 equals the average resistance of electrode 201; the resistance of the sixth resistor R6 equals the average resistance of electrode 201; the resistance of the seventh resistor R7 equals the resistance of the first resistor R1; the resistance of the eighth resistor R8 equals the resistance of the second resistor R2; the capacitance of the second capacitor C2 equals the average capacitance of electrode 201; the capacitance of the fourth capacitor C4 equals the average capacitance of electrode 201; the capacitance of the third capacitor C3 equals the average capacitance of the mutual capacitors; and the capacitance of the fifth capacitor C5 equals the capacitance of the first capacitor C1.

[0095] It should be understood that by setting the resistance value of the resistor to be M times the resistance value of the corresponding resistor, and the capacitance value of the capacitor to be 1 / M times the capacitance value of the corresponding capacitor, the capacitance value required by the touch chip 100 can be reduced under the premise of outputting the same signal. For example, if M = 40, then when the average capacitance value of the electrode 201 is 1300pF, the capacitance values ​​of the second capacitor C2 and the fourth capacitor C4 only need to be 32.5pF.

[0096] In this embodiment, the resistance value of the resistor in the first analog subunit 1041 is set to be the product of the resistance value of the corresponding resistor and the second gain coefficient, and the capacitance value of the capacitor in the first analog subunit 1041 is set to be the ratio of the capacitance value of the corresponding capacitor to the second gain coefficient. Under the premise of outputting the same signal, the capacitance value required by the first analog subunit 1041 can be reduced, thereby reducing the production cost of the touch chip 100.

[0097] Figure 10 This is a schematic diagram of a weighted subunit provided in an embodiment of this application, as shown below. Figure 10 As shown, the weighting subunit 1022 includes an eleventh resistor R11 and a twelfth resistor R12. The first end of the eleventh resistor R11 is connected to the analog unit 104, and the first end of the twelfth resistor R12 is connected to the feedback subunit 1021. The second end of the eleventh resistor R11 and the second end of the twelfth resistor R12 are connected to the non-inverting input terminal of the first amplifier D1. The weighting subunit 1022 is used to adjust the weight of the analog signal through the eleventh resistor R11 and to adjust the weight of the feedback signal through the twelfth resistor R12. The second ends of the eleventh resistor R11 and the second ends of the twelfth resistor R12 serve as the output terminals of the weighting subunit 1022 to output the compensation signal.

[0098] This application provides only one implementation of the weighting subunit 1022. In other embodiments of this application, the weighting subunit 1022 can also adjust the weights of the feedback signal and / or analog signal and generate a compensation signal in other ways. The specific implementation method is not limited.

[0099] In this embodiment, the weighting subunit 1022 includes an eleventh resistor R11 and a twelfth resistor R12. The weight of the analog signal can be adjusted through the eleventh resistor R11, and the weight of the feedback signal can be adjusted through the twelfth resistor R12, so as to generate a compensation signal based on the analog signal and the feedback signal, so that the compensation signal can simultaneously cancel the base signal and the interference signal.

[0100] Figure 11 This is a schematic diagram of a second signal conversion unit provided in an embodiment of this application, as shown below. Figure 11As shown, the second signal conversion unit 1032 includes: a differential amplifier subunit 10321, a low-pass filter subunit 10322, a buffer subunit 10323, and an analog-to-digital converter 10324. The differential amplifier subunit 10321 is electrically connected to the first signal conversion unit 1031, the low-pass filter subunit 10322 is electrically connected to the differential amplifier subunit 10321, the buffer subunit 10323 is electrically connected to the low-pass filter subunit 10322, and the analog-to-digital converter 10324 is electrically connected to the buffer subunit 10323.

[0101] The differential amplification subunit 10321 is used to differentially amplify the first identification sub-signal to obtain the second identification sub-signal. The low-pass filtering subunit 10322 is used to low-pass filter the second identification signal to obtain the third identification sub-signal. The buffer subunit 10323 and the analog-to-digital converter 10324 are used to generate the identification signal based on the third identification sub-signal.

[0102] It should be understood that the embodiments of this application only provide one example of the post-processing circuit of TIA in the identification unit 103. Other implementations may only include part of the circuit structure in the embodiments of this application. The specific structure of the post-processing circuit is not limited in this application.

[0103] In this embodiment, the signal conversion unit includes a differential amplification subunit 10321, a low-pass filtering subunit 10322, a buffer subunit 10323, and an analog-to-digital converter 10324. The differential amplification subunit 10321 can differentially amplify the first identification sub-signal to obtain a second identification sub-signal. The low-pass filtering subunit 10322 can low-pass filter the second identification sub-signal to obtain a third identification sub-signal. The buffer subunit 10323 and the analog-to-digital converter 10324 can generate an identification signal based on the third identification sub-signal. This allows the conversion of the first identification sub-signal into an identification signal. Since the voltage signal converted from signal interference in the first identification sub-signal is canceled out by the compensation signal, at least some of the structures in the differential amplification subunit 10321, low-pass filtering subunit 10322, buffer subunit 10323, and analog-to-digital converter 10324 can be configured with a large signal gain, ensuring that the amplified signal does not exceed the dynamic range of signal detection by the identification unit 103, thereby improving the sensitivity of touch detection.

[0104] Figure 12 This is a schematic diagram of a display screen provided in an embodiment of this application, such as... Figure 12 As shown, the display screen 200 includes electrodes 201 and a touch chip 100 in any of the foregoing embodiments.

[0105] In this embodiment, the electrode 201 can be the electrode 201 in any of the foregoing embodiments, and the touch chip 100 can be the touch chip 100 in any of the foregoing embodiments. The specific structure and interaction logic can be found in the description of any of the foregoing embodiments, and will not be repeated here.

[0106] Figure 13 This is a schematic diagram of an electronic device provided in an embodiment of this application, such as... Figure 13 As shown, the electronic device 300 includes a display screen as described in the foregoing embodiments.

[0107] It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of this application can be broken down into more components / steps, or two or more components / steps or parts of the operation of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of this application.

[0108] It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of this application can be broken down into more components / steps, or two or more components / steps or parts of the operation of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of this application.

[0109] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application.

[0110] The above embodiments are only used to illustrate the embodiments of this application, and are not intended to limit the embodiments of this application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of this application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of this application, and the patent protection scope of the embodiments of this application should be defined by the claims.

Claims

1. A touch chip, disposed in an electronic device, characterized in that, include: The system comprises a driving unit, a compensation unit, and multiple identification units. The recognition unit is electrically connected to the electrode in the electronic device through the pin of the touch chip, and different recognition units are electrically connected to different electrodes; the compensation unit is electrically connected to the plurality of recognition units respectively, and the driving unit is electrically connected to the electrode; The driving unit is used to generate a driving signal and send the driving signal to the electrode; The compensation unit is configured to send compensation signals to the plurality of identification units respectively, based at least on the reference signals generated by the plurality of identification units. The compensation signals sent to the plurality of identification units are not completely identical. The compensation signals are matched with a reference signal and an interference signal coupled to the electrode. The reference signal is the reference signal generated by the identification unit when the electronic device is not touched. The identification unit is used to receive the sensing signal generated by the electrode and generate an identification signal based on the sensing signal and the compensation signal. The identification signal is used for touch detection.

2. The touch chip according to claim 1, characterized in that, The compensation unit includes: a feedback subunit and multiple weight subunits; The feedback subunit is electrically connected to the plurality of weight subunits, the plurality of weight subunits is electrically connected to the plurality of identification units, and different weight subunits are electrically connected to different identification units; The feedback subunit is used to generate a feedback signal based on the reference signal; The weighting subunit is used to generate, at least based on the feedback signal, the compensation signal corresponding to the identification unit of the connection.

3. The touch chip according to claim 2, characterized in that, The electrode includes multiple horizontal electrodes and multiple vertical electrodes. The touch chip outputs the driving signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and receives the sensing signal output by the other of the multiple horizontal electrodes and the multiple vertical electrodes.

4. The touch chip according to claim 3, characterized in that, The identification unit includes: a first signal conversion unit and a second signal conversion unit; The first signal conversion unit is electrically connected to the electrode, the second signal conversion unit is electrically connected to the first signal conversion unit, and the weighting subunit is electrically connected to the first signal conversion unit. The first signal conversion unit is used to receive the compensation signal and the sensing signal generated by the electrode, and convert the sensing signal into a first identification sub-signal according to the compensation signal; The second signal conversion unit is used to generate the identification signal based on the first identification sub-signal.

5. The touch chip according to claim 4, characterized in that, The first signal conversion unit includes: a first amplifier, a first resistor, a second resistor, and a first capacitor; The first end of the first resistor is electrically connected to the electrode, the second end of the first resistor is connected to the negative input terminal of the first amplifier, the first end of the first capacitor is connected to the negative input terminal of the first amplifier, the second end of the first capacitor is connected to the output terminal of the first amplifier, the first end of the second resistor is connected to both the negative input terminal of the first amplifier and the first end of the first capacitor, the second end of the second resistor is connected to both the output terminal of the first amplifier and the second end of the first capacitor, and the positive input terminal of the first amplifier is connected to the weighting subunit.

6. The touch chip according to claim 5, characterized in that, The feedback subunit includes: a second amplifier, a fourth resistor, and multiple third resistors; The first end of the third resistor is electrically connected to the output of the first amplifier. Different third resistors are connected to different first amplifiers. The second end of the third resistor is connected to the negative input of the second amplifier. The first end of the fourth resistor is connected to the negative input of the second amplifier. The second end of the fourth resistor is connected to the output of the second amplifier. The output of the second amplifier is connected to each of the weighted sub-units. The positive input of the second amplifier is used to receive the reference voltage.

7. The touch chip according to claim 6, characterized in that, The resistance value of the fourth resistor is equal to the product of the ratio between the resistance value of the third resistor and the number of the third resistors, and the first gain coefficient.

8. The touch chip according to claim 7, characterized in that, The touch chip also includes: an analog unit; The simulation unit is electrically connected to each of the weighted subunits; The simulation unit is used to generate a simulation signal, wherein the simulation signal is used to simulate a feedback signal generated by the feedback subunit based on the reference signal when the electronic device is not touched and there is no signal interference; The weighting subunit is used to generate the compensation signal based on the analog signal and the feedback signal.

9. The touch chip according to claim 8, characterized in that, The simulation unit includes: a first simulation subunit and a second simulation subunit; The first simulation subunit is electrically connected to the second simulation subunit, and the second simulation subunit is electrically connected to the weight subunit; The first analog subunit is configured to generate an analog sub-signal based on the driving signal, wherein the analog sub-signal is used to simulate the reference signal generated by the identification unit when the electronic device is not touched and there is no interference signal; The second analog subunit is used to generate the analog signal based on the analog sub-signal.

10. The touch chip according to claim 9, characterized in that, The first analog subunit includes: a third amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor; The first end of the fifth resistor is electrically connected to the driving unit. The second end of the fifth resistor is connected to the first end of the second capacitor and the first end of the third capacitor. The second end of the second capacitor is grounded. The second end of the third capacitor is connected to the first end of the fourth capacitor and the first end of the sixth resistor. The second end of the fourth capacitor is grounded. The second end of the sixth resistor is connected to the first end of the seventh resistor. The second end of the seventh resistor is connected to the negative input terminal of the third amplifier. The first end of the fifth capacitor is connected to the negative input terminal of the third amplifier. The second end of the fifth capacitor is connected to the output terminal of the third amplifier. The first end of the eighth resistor is connected to the first end of the fifth capacitor and the negative input terminal of the third amplifier. The second end of the eighth resistor is connected to the second end of the fifth capacitor and the output terminal of the third amplifier. The positive input terminal of the third amplifier is connected to the second analog subunit. The output terminal of the third amplifier is connected to the second analog subunit.

11. The touch chip according to claim 10, characterized in that, The second analog subunit includes: a fourth amplifier, a ninth resistor, and a tenth resistor; The first end of the ninth resistor is connected to the output terminal of the third amplifier, the second end of the ninth resistor is connected to the negative input terminal of the fourth amplifier, the first end of the tenth resistor is connected to the negative input terminal of the fourth amplifier, the second end of the tenth resistor is connected to the output terminal of the fourth amplifier, the output terminal of the fourth amplifier is connected to the positive input terminal of the third amplifier and the weighting subunit, and the positive input terminal of the fourth amplifier is used to receive the reference voltage.

12. The touch chip according to claim 11, characterized in that, The resistance value of the tenth resistor is equal to the product of the resistance value of the ninth resistor and the first gain coefficient.

13. The touch chip according to claim 10, characterized in that, The resistance values ​​of the fifth resistor and the sixth resistor are equal to the product of the resistance value of the electrode and the second gain coefficient; the capacitance values ​​of the second capacitor and the fourth capacitor are equal to the ratio of the capacitance value of the electrode to the second gain coefficient; the capacitance value of the third capacitor is equal to the ratio of the mutual capacitance between the lateral electrode and the longitudinal electrode to the second gain coefficient; the resistance value of the seventh resistor is equal to the product of the resistance value of the first resistor and the second gain coefficient; the resistance value of the eighth resistor is equal to the product of the resistance value of the second resistor and the second gain coefficient; and the capacitance value of the fifth capacitor is equal to the ratio of the capacitance value of the first capacitor to the second gain coefficient.

14. The touch chip according to claim 8, characterized in that, The weighted subunit includes an eleventh resistor and a twelfth resistor; The first end of the eleventh resistor is connected to the analog unit, the first end of the twelfth resistor is connected to the feedback subunit, and the second end of the eleventh resistor is connected to the second end of the twelfth resistor and then connected to the non-inverting input terminal of the first amplifier. The weighting subunit is used to adjust the weight of the analog signal through the eleventh resistor and to adjust the weight of the feedback signal through the twelfth resistor. The second end of the eleventh resistor and the second end of the twelfth resistor serve as the output terminals of the weighting subunit to output the compensation signal.

15. The touch chip according to any one of claims 4-14, characterized in that, The second signal conversion unit includes: a differential amplifier subunit, a low-pass filter subunit, a buffer subunit, and an analog-to-digital converter; The differential amplifier subunit is electrically connected to the first signal conversion unit, the low-pass filter subunit is electrically connected to the differential amplifier subunit, the buffer subunit is electrically connected to the low-pass filter subunit, and the analog-to-digital converter is electrically connected to the buffer subunit; The differential amplification subunit is used to differentially amplify the first identification sub-signal to obtain the second identification sub-signal; The low-pass filtering subunit is used to perform low-pass filtering on the second identification sub-signal to obtain the third identification sub-signal; The buffer subunit and the analog-to-digital converter are used to generate the identification signal based on the third identification sub-signal.

16. A display screen, characterized in that, It includes electrodes and a touch chip as described in any one of claims 1-15.

17. An electronic device, characterized in that, Includes the display screen as described in claim 16.

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