Touch chips, display screens and electronic devices

Abstract

This application provides a touch chip, a display screen, and an electronic device. The touch chip includes a driving unit, a signal analog unit, and multiple recognition units. The recognition units are electrically connected to electrodes in the electronic device via pins of the touch chip, and different recognition units are electrically connected to different electrodes. The driving unit is electrically connected to multiple recognition units, and the signal analog unit is electrically connected to multiple recognition units. The driving unit generates a driving signal and sends it to the electrodes. The signal analog unit generates an analog signal, wherein the analog signal is the same as the reference signal generated by the recognition units when the electronic device is not touched. The recognition unit receives a first sensing signal generated by the electrodes in response to the driving signal and generates a recognition signal based on the first sensing signal and the analog signal. The recognition signal is used for touch detection. The touch chip provided in this application has high touch 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 self-capacitance scheme, which detects touch by detecting changes in the electrode's capacitance to ground after a finger touches the screen.

[0004] However, when using the self-capacitance scheme of electrodes for touch detection, due to the high capacitance to ground of the electrodes, the change in capacitance to ground of the electrodes is small when the user touches the screen with their finger. This results in a small change in the signal of the sensing signal generated by the electrodes, and thus low sensitivity of touch detection. 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 signal simulation 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 driving unit is electrically connected to the plurality of recognition units respectively, and the signal simulation unit is electrically connected to the plurality of recognition units respectively; the driving unit is configured to generate a driving signal and send the driving signal to the electrodes; the signal simulation unit is configured to generate an analog signal, wherein the analog signal is the same as the reference signal generated by the recognition units when the electronic device is not touched; the recognition unit is configured to receive a first sensing signal generated by the electrodes in response to the driving signal, and generate an recognition signal based on the first sensing signal and the analog signal, the recognition signal being used for touch detection.

[0007] In one possible implementation, the electrode includes a plurality of lateral electrodes and / or a plurality of vertical electrodes, at least one of the plurality of lateral electrodes and the plurality of vertical electrodes serving as both a driving electrode and a receiving electrode. The touch chip sends the driving signal to the driving electrode and receives the second sensing signal or the first sensing signal output by the receiving electrode.

[0008] 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, the driving unit is electrically connected to the first signal conversion unit in each of the plurality of identification units, and the signal simulation unit is electrically connected to the second signal conversion unit in each of the plurality of identification units; the first signal conversion unit is configured to send the driving signal to the connected electrode, receive the first sensing signal generated by the electrode, generate a first identification sub-signal based on the first sensing signal, and, when the electronic device is not touched, receive a second sensing signal generated by the electrode and generate the reference signal based on the second sensing signal; the second signal conversion unit is configured to generate the identification signal based on the first identification sub-signal and the simulation signal.

[0009] 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 connected to the electrode, a second end of the first resistor is connected to the inverting input terminal of the first amplifier, a first end of the first capacitor is connected to the inverting 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 inverting input terminal of the first amplifier and the first end of the first capacitor, and 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.

[0010] In one possible implementation, the driving unit includes: a digital-to-analog converter, a second amplifier, a plurality of third resistors, and a fourth resistor; the output terminal of the digital-to-analog converter is connected to the non-inverting input terminal of the second amplifier, the first terminal of each third resistor is connected to the output terminal of the first amplifier, different third resistors are connected to different first amplifiers, the second terminal of each third resistor is connected to the inverting input terminal of the second amplifier, the first terminal of each fourth resistor is connected to the inverting input terminal of the second amplifier, the second terminal of each fourth resistor is connected to the output terminal of the second amplifier, and the input terminal of the second amplifier is connected to the non-inverting input terminal of the first amplifier; the driving unit is used to generate the driving signal and send the driving signal to the non-inverting input terminal of the first amplifier in each of the first signal conversion units.

[0011] 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.

[0012] In one possible implementation, the signal 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 second signal conversion unit; the first simulation subunit is used to generate an analog drive signal, wherein the analog drive signal is used to simulate the drive signal; the second simulation subunit is used to generate the analog signal based on the analog drive signal.

[0013] In one possible implementation, the first analog subunit includes: a third amplifier, a fifth resistor, and a sixth resistor; the output terminal of the digital-to-analog converter is connected to the non-inverting input terminal of the third amplifier, the first terminal of the fifth resistor is connected to the inverting input terminal of the third amplifier, the second terminal of the fifth resistor is connected to the second analog subunit, the first terminal of the sixth resistor is connected to the output terminal of the third amplifier, the second terminal of the sixth resistor is connected to the inverting input terminal of the third amplifier, and the output terminal of the third amplifier is connected to the second analog subunit.

[0014] In one possible implementation, the resistance of the sixth resistor is equal to the product of the resistance of the fifth resistor and the first gain coefficient.

[0015] In one possible implementation, the second analog subunit includes: a fourth amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, and a third capacitor; the first terminal of the second capacitor is grounded, the second terminal of the second capacitor is connected to the first terminal of the seventh resistor, the second terminal of the seventh resistor is connected to the first terminal of the eighth resistor, the second terminal of the eighth resistor is connected to the inverting input terminal of the fourth amplifier, the first terminal of the third capacitor is connected to the inverting input terminal of the fourth amplifier, the second terminal of the third capacitor is connected to the output terminal of the fourth amplifier, the first terminal of the ninth resistor is connected to both the inverting input terminal of the fourth amplifier and the first terminal of the third capacitor, the second terminal of the ninth resistor is connected to both the output terminal of the fourth amplifier and the second terminal of the third capacitor, the output terminal of the third amplifier is connected to the non-inverting input terminal of the fourth amplifier, and the output terminal of the fourth amplifier is connected to both the second terminal of the fifth resistor and the second signal conversion unit.

[0016] In one possible implementation, the resistance of the seventh resistor is equal to the product of the average resistance of the electrodes and the second gain coefficient; the resistance of the eighth resistor is equal to the product of the resistance of the first resistor and the second gain coefficient; the resistance of the ninth resistor is equal to the product of the resistance of the second resistor and the second gain coefficient; the capacitance of the second capacitor is equal to the ratio of the average capacitance of the electrodes to the second gain coefficient; and the capacitance of the third capacitor is equal to the ratio of the capacitance of the first capacitor to the second gain coefficient.

[0017] In one possible implementation, the second signal conversion unit includes a gain subunit and a calculation subunit; the gain subunit is electrically connected to the first signal conversion unit, and the calculation subunit is electrically connected to both the gain subunit and the signal analog unit; the gain subunit is used to amplify the first identification sub-signal; the calculation subunit is used to generate a second identification sub-signal based on the amplified first identification sub-signal and the analog signal, so that the second signal conversion unit generates the identification signal based on the second identification sub-signal.

[0018] In one possible implementation, the second signal conversion unit further includes: a differential amplification unit, a low-pass filter unit, a buffer unit, and an analog-to-digital converter; the differential amplification unit is electrically connected to the computing unit, the low-pass filter unit is electrically connected to the differential amplification unit, the buffer unit is electrically connected to the low-pass filter unit, and the analog-to-digital converter is electrically connected to the buffer unit; the differential amplification unit is used to differentially amplify the second identification sub-signal to obtain a third identification sub-signal; the low-pass filter unit is used to low-pass filter the third identification sub-signal to obtain a fourth identification sub-signal; the buffer unit and the analog-to-digital converter are used to generate the identification signal based on the fourth identification sub-signal.

[0019] 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.

[0020] 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.

[0021] According to the touch chip provided in the embodiments of this application, the touch chip includes a driving unit, a signal simulation unit, and multiple recognition units. The driving unit can generate a driving signal, and the recognition unit can send the driving signal to the connected electrode and receive the first sensing signal sent by the electrode. The signal simulation unit can generate an analog signal, and the recognition unit performs touch detection based on the first sensing signal and the analog signal. Since the analog signal is the same as the reference signal generated by the recognition unit when the electronic device is not touched, when the recognition unit performs touch detection based on the first sensing signal and the analog signal, the base signal in the first sensing signal can be canceled by the analog signal, so that the recognition unit can perform touch detection only based on the signal increment in the first sensing signal generated by finger touch, which can improve the sensitivity of touch detection. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of a touch chip provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of an identification unit provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of a first signal conversion unit provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of a driving unit provided in an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of a signal simulation unit provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of a first analog subunit provided in an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of a second simulation subunit provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of a second signal conversion unit provided in an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of another second signal conversion unit provided in an embodiment of this application;

[0032] Figure 10 This is a schematic diagram of a display screen provided in an embodiment of this application;

[0033] Figure 11 This is a schematic diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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."

[0037] First, let's briefly explain the principle of touch control. When using an electrode self-capacitance scheme for touch detection, the touch chip sends a drive signal to the electrode. When the finger is not touching, the electrode has capacitance to ground. After receiving the drive signal, the electrode generates a sensing signal, which is the sensing signal generated by the electrode's capacitance to ground (hereinafter referred to as the base signal). When the finger touches, the electrode's capacitance to ground changes. Specifically, when the finger touches, the electrode's capacitance to ground increases. At this time, the electrode responds to the sensing signal generated by the drive signal. This sensing signal is generated by the electrode's capacitance to ground and the change in capacitance to ground after the finger touches. That is, the sensing signal consists of the base signal and the signal change after the finger touches. The touch chip can perform touch detection based on the signal change after the finger touches. However, when using the self-capacitance scheme of electrodes for touch detection, the electrodes have a high capacitance to ground, for example, the capacitance to ground of the electrodes is 100pF to 1000pF, but when a finger touches the ground, the change in capacitance to ground is only about 0.5pF. This results in a small change in the signal of the sensing signal generated by the electrodes, and low sensitivity of touch detection.

[0038] For ease of explanation, the induced signal generated by the capacitance to ground of the electrodes when the finger is not touching will be referred to as the base signal. After the finger touches the electrode, the amount of signal change caused by the change in the capacitance to ground of the electrodes due to the finger will be referred to as the signal increment.

[0039] 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 signal simulation unit 102, and multiple recognition units 103. The recognition units 103 are electrically connected to 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 is electrically connected to multiple recognition units 103 respectively, and the signal simulation unit 102 is electrically connected to multiple recognition units 103 respectively.

[0040] The driving unit 101 can generate a driving signal and send the driving signal to the electrode 201. The signal simulation unit 102 can generate an analog signal, wherein the analog signal is the same as the reference signal generated by the recognition unit 103 when the electronic device is not touched. The recognition unit 103 can receive the first sensing signal generated by the electrode in response to the driving signal, and generate an recognition signal based on the first sensing signal and the analog signal. The recognition signal is used for touch detection.

[0041] The touch chip 100 includes multiple recognition units 103. The multiple recognition units 103 are electrically connected to the electrodes 201 through the pins of the touch chip 100. The multiple recognition units 103 correspond one-to-one with the multiple 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 the driving unit 101 generates the driving signal, it sends the driving signal to the recognition unit 103. The recognition unit 103 sends the driving signal to the connected electrodes 201.

[0042] After receiving the drive signal, electrode 201 generates a second sensing signal in response to the drive signal when the finger is not touching it, due to its capacitance to ground and impedance. The second sensing signal is the base signal generated by electrode 201 when the finger is not touching it. When the finger touches it, the capacitance to ground of electrode 201 touched by the finger increases, the second sensing signal in electrode 201 increases, and a first sensing signal is generated. The first sensing signal is the sum of the second sensing signal (base signal) and the signal increment of the sensing signal after the finger touches it.

[0043] Based on the above-mentioned touch detection principle, the signal simulation unit 102 in the touch chip 100 can generate an analog signal. The analog signal is the same as the reference signal generated by the recognition unit 103 when the electronic device is not touched. That is, the analog signal can simulate the reference signal generated by the recognition unit 103 based on the second sensing signal after receiving the second sensing signal. After generating the analog signal, the signal simulation unit 102 sends the analog signal to the recognition unit 103. When the finger touches the screen, the recognition unit 103 receives the first sensing signal generated by the electrode and performs touch detection based on the first sensing signal and the analog signal. Specifically, since the analog signal can simulate the reference signal generated by the recognition unit 103 based on the base signal, and the first sensing signal is the sum of the base signal and the signal increment, when the recognition unit 103 performs touch detection based on the first sensing signal and the analog signal, it can cancel the base signal in the first sensing signal through the analog signal. Thus, the recognition unit 103 can perform touch detection only based on the signal increment generated after the finger touches the screen. Optionally, since the recognition unit 103 cancels the base signal in the first sensing signal according to the analog signal, a larger gain can be set in the recognition unit 103 to amplify the signal strength corresponding to the signal increment generated after finger touch. It should be understood that when a base signal is present, since the base signal is large, if a large gain is set in the recognition unit 103, the amplified signal will exceed the dynamic range of the recognition unit 103. Therefore, a large signal gain cannot be set in the recognition unit 103 when a base signal is present.

[0044] In this embodiment, the touch chip 100 includes a driving unit 101, a signal simulation unit 102, and multiple recognition units 103. The driving unit 101 can generate a driving signal, and the recognition unit 103 can send the driving signal to the connected electrode 201 and receive the first sensing signal sent by the electrode. The signal simulation unit 102 can generate an analog signal, and the recognition unit 103 performs touch detection based on the first sensing signal and the analog signal. Since the analog signal is the same as the reference signal generated by the recognition unit 103 when the electronic device is not touched, when the recognition unit 103 performs touch detection based on the first sensing signal and the analog signal, the base signal in the first sensing signal can be canceled by the analog signal, so that the recognition unit 103 can perform touch detection only based on the signal increment generated by the finger touch in the first sensing signal, which can improve the sensitivity of touch detection.

[0045] In one possible implementation, electrode 201 includes multiple lateral electrodes and / or multiple vertical electrodes, at least one of which serves as both a transmitting electrode and a receiving electrode. Touch chip 100 sends a drive signal to the transmitting electrode and receives a first sensing signal output by electrode 201 as a receiving electrode.

[0046] At least one of the multiple horizontal electrodes and multiple vertical electrodes serves as both a transmitting electrode and a receiving electrode. The touch chip 100 sends a drive signal to the transmitting electrode and performs touch detection based on the sensing signal output by the receiving electrode. Specifically, the recognition unit 103 in the touch chip 100, connected to the multiple horizontal electrodes, outputs a drive signal to the multiple horizontal electrodes (transmitting electrodes) and simultaneously receives sensing signals (a second sensing signal or a first sensing signal) output by the multiple horizontal electrodes (receiving electrodes). Alternatively, the recognition unit 103 in the touch chip 100, connected to the multiple vertical electrodes, outputs a drive signal to the multiple vertical electrodes (transmitting electrodes) and simultaneously receives sensing signals (a second sensing signal or a first sensing signal) output by the multiple vertical electrodes (receiving electrodes). Alternatively, multiple recognition units 103 in the touch chip 100 may simultaneously output drive signals to multiple horizontal electrodes and multiple vertical electrodes, and multiple recognition units 103 may simultaneously receive sensing signals output by multiple horizontal electrodes and multiple vertical electrodes. It should be understood that the sensing signal may be a second sensing signal or a first sensing signal. When the electronic device is not touched by a finger, the sensing signal output by the receiving electrode is the second sensing signal. When the electronic device is touched by a finger, the sensing signal output by the receiving electrode corresponding to the finger touch position is the first sensing signal. The recognition unit 103 may generate a recognition signal based on the received first sensing signal and analog signal.

[0047] In one example, the touch chip 100 can first output a drive signal to the horizontal electrode, obtain the Y-axis coordinate of the touch position based on the first sensing signal generated by the horizontal electrode, and then output a drive signal to the vertical electrode, obtain the X-axis coordinate of the touch position based on the first sensing signal generated by the vertical electrode. Alternatively, the X-axis coordinate can be detected first and then the Y-axis coordinate can be detected. In another example, drive signals can be output to both the horizontal and vertical electrodes simultaneously, and the X-axis and Y-axis coordinates of the touch position can be obtained based on the first sensing signals generated by the horizontal and vertical electrodes. In yet another example, drive signals can be output to only the horizontal or vertical electrodes, and the X-axis or Y-axis coordinates of the touch position can be detected based on the first sensing signals generated by the horizontal or vertical electrodes. That is, only the X-axis or Y-axis coordinates of the touch position are detected, which is suitable for scenarios with low detection accuracy requirements. The specific detection method can be set as needed and is not limited here.

[0048] In this embodiment, the recognition unit 103 can output a driving signal to the electrode 201. When the finger touches the screen, a first sensing signal can be generated by the self-capacitance of the electrode 201. The recognition unit 103 generates a recognition signal based on the first sensing signal and the analog signal. The touch chip 100 performs touch detection based on the recognition signal, thereby realizing touch detection by the self-capacitance of the electrode 201.

[0049] Figure 2 This is a schematic diagram of an identification unit provided in an embodiment of this application, such as... Figure 2 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, and the second signal conversion unit 1032 is electrically connected to the first signal conversion unit 1031. The driving unit 101 is electrically connected to the first signal conversion unit 1031 in the plurality of identification units 103, and the signal simulation unit 102 is electrically connected to the second signal conversion unit 1032 in the plurality of identification units 103.

[0050] The first signal conversion unit 1031 can send a drive signal to the connected electrode 201, receive the first sensing signal generated by the electrode, generate a first identification sub-signal based on the first sensing signal, and receive the second sensing signal generated by the electrode when the electronic device is not touched, and generate a reference signal based on the second sensing signal. The second signal conversion unit 1032 can generate an identification signal based on the first identification sub-signal and the analog signal.

[0051] In one example, the first signal conversion unit 1031 can be a trans-impedance amplifier (TIA) circuit, which can convert the first sensing signal (current signal) transmitted by the electrode 201 into a first identification sub-signal (voltage signal). The second signal conversion unit 1032 can be a subsequent processing circuit, which can process the first identification sub-signal and the analog signal to generate an identification signal (digital signal). The touch chip 100 can perform touch detection based on the identification signal (digital signal).

[0052] It should be understood that when the electronic device is not touched, the electrode 201 transmits a second sensing signal (current signal) to the first signal conversion unit 1031. The first signal conversion unit 1031 generates a reference signal (voltage signal) based on the second sensing signal (current signal). At this time, the reference signal is the voltage signal generated by the base signal transmitted by the electrode 201. The analog unit can generate an analog signal that simulates the reference signal. The first identification sub-signal generated by the first signal conversion unit 1031 based on the first sensing signal includes a first voltage signal generated based on the base signal and a second voltage signal generated based on the signal increment generated by the finger touch. When the second signal conversion unit 1032 generates an identification signal based on the first identification sub-signal and the analog signal, the first voltage signal generated based on the base signal in the first identification sub-signal can be canceled out by the analog signal. Thus, the second signal conversion unit 1032 can generate an identification signal based solely on the second voltage signal generated by the signal increment generated by the finger touch.

[0053] In this embodiment of the application, the identification unit 103 includes a first signal conversion unit 1031 and a second signal conversion unit 1032. The first signal conversion unit 1031 can convert the first sensing signal (current signal) transmitted by the electrode 201 into a first identification sub-signal (voltage signal). The second signal conversion unit 1032 generates an identification signal based on the first identification sub-signal and the analog signal, thereby realizing the signal conversion.

[0054] Figure 3 This is a schematic diagram of a first signal conversion unit provided in an embodiment of this application, as shown below. Figure 3As 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 connected to the electrode 201, and the second end of the first resistor R1 is connected to the inverting input terminal of the first amplifier D1. The first end of the first capacitor C1 is connected to the inverting 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 inverting 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.

[0055] The second resistor R2 can serve as the feedback resistor for the first amplifier D1. The first capacitor C1 and the first amplifier D1 can form a transimpedance amplifier circuit TIA. The inverting input terminal of the first amplifier D1 is connected to the electrode 201 through the first resistor R1. The transimpedance amplifier circuit can receive the second induced signal or the first induced signal generated by the electrode through the first resistor R1, and convert the first induced signal (current signal) generated by the electrode 201 into a first identification sub-signal (voltage signal), or convert the second induced signal (current signal) generated by the electrode 201 into a reference signal (voltage signal).

[0056] In this embodiment, the second resistor R2 can be used as the feedback resistor of 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 transimpedance amplifier circuit TIA can convert the first induced signal (current signal) generated by the electrode 201 into a first identification sub-signal (voltage signal), or convert the second induced signal (current signal) generated by the electrode 201 into a reference signal (voltage signal), thus realizing signal conversion.

[0057] Figure 4 This is a schematic diagram of a driving unit provided in an embodiment of this application, such as... Figure 4As shown, the driving unit 101 includes: a digital-to-analog converter 1011, a second amplifier D2, multiple third resistors R3 and fourth resistors R4. The output terminal of the digital-to-analog converter 1011 is connected to the non-inverting input terminal of the second amplifier D2. The first terminal of the third resistor R3 is connected to the output terminal of the first amplifier D1. Different third resistors R3 are connected to different first amplifiers D1. The second terminal of each third resistor R3 is connected to the inverting input terminal of the second amplifier D2. The first terminal of the fourth resistor R4 is connected to the inverting input terminal of the second amplifier D2. The second terminal of the fourth resistor R4 is connected to the output terminal of the second amplifier D2. The input terminal of the second amplifier D2 is connected to the non-inverting input terminal of the first amplifier D1. The driving unit 101 can generate a driving signal and send the driving signal to the non-inverting input terminal of the first amplifier D1 in each first signal conversion unit 1031.

[0058] The touch chip 100 can send digital signals to the digital-to-analog converter 1011. The digital-to-analog converter 1011 can convert the digital signals sent by the touch chip 100 into driving sub-signals. The driving sub-signals can be square wave signals, sine wave signals, trapezoidal wave signals, etc. The output terminal of the digital-to-analog converter 1011 is connected to the non-inverting input terminal of the second amplifier D2. After generating the driving sub-signals, the digital-to-analog converter 1011 sends the driving sub-signals to the non-inverting input terminal of the second amplifier D2. The voltage signal output from the output terminal of the first amplifier D1 in each first signal conversion unit 1031 is processed by the third voltage converter corresponding to that first signal conversion unit 1031. Resistor R3 is converted into a current signal and input to the inverting input terminal of the second amplifier D2. The second amplifier D2 and the fourth resistor R4 form a transimpedance amplifier circuit. The second amplifier D2 generates a drive signal based on the drive sub-signal and the current signals transmitted by each third resistor R3, and sends the drive signal to the non-inverting input terminal of the first amplifier D1 in each first signal conversion unit 1031. Due to the circuit principle of the first amplifier D1, the voltage of the inverting input terminal is pulled down or pulled up to be the same as the voltage of the non-inverting input terminal. This is equivalent to outputting the drive signal received by the non-inverting input terminal to the electrode 201 through the inverting input terminal of the first amplifier D1, thereby realizing the sending of the drive signal to the electrode 201.

[0059] It should be understood that since the inverting 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 non-inverting input terminal of the first amplifier D1, the negative feedback circuit of the first signal conversion unit 1031 can be formed by the second amplifier D2 and the fourth resistor R4. The second amplifier D2 and the fourth resistor R4 can cancel out part of the base signal in the induced signal generated by the electrode 201, as well as the external signal interference generated by the signal coupling to the electrode 201.

[0060] In this embodiment, the driving unit 101 includes a digital-to-analog converter 1011, a second amplifier D2, multiple third resistors R3 and fourth resistors R4. The digital-to-analog converter 1011 can convert the digital signal generated by the touch chip 100 into a driving sub-signal. The third resistors R3 can convert the voltage signal output by the first signal conversion unit 1031 into a current signal. The second amplifier D2 and the fourth resistors R4 can generate a driving signal based on the driving sub-signal and the current signal output by each third resistor R3, thus realizing the generation of a driving signal. Since the driving unit 101 can form a negative feedback circuit for the first signal conversion unit 1031, it can cancel part of the base signal included in the induced signal generated by the electrode 201, as well as cancel part of the external signal interference. This can increase the proportion of the voltage signal converted by the first signal conversion unit 1031 based on the signal increment generated by the finger touch in the voltage signal output by the first signal conversion unit 1031.

[0061] 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.

[0062] 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.

[0063] It should be understood that the driving unit 101 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, an average feedback circuit can be formed through the second amplifier D2 and the fourth resistor R4, feeding back the average value of the voltage signals output by the multiple first signal conversion units 1031 to each first signal conversion unit 1031. Specifically, the N third resistors R3 will receive the average value of the voltage signals output by the N first signal conversion units 1031. The voltage signal is converted into N current signals. The fourth resistor R4 serves as the feedback resistor of the second amplifier D2 and receives N current signals. Since the driving unit 101 transmits the driving signal to each of the first signal conversion units 1031, and the current signal corresponding to one first signal conversion unit 1031 is N current signals / N, when the resistance value of the fourth resistor R4 is linearly related to the resistance value of the third resistor R3 / N, the driving signal corresponding to one first signal conversion unit 1031 can be generated based on the voltage signals transmitted by the N first signal conversion units 1031.

[0064] In this embodiment, 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. 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 driving signal. The driving unit 101 can also serve as an averaging feedback circuit for each of the first signal conversion units 1031. The average of the output signals of each of the first signal conversion units 1031 can offset part of the base signal and external signal interference in the first sensing signal generated by the electrode 201, thereby increasing the proportion of the signal increment generated by finger touch in the first sensing signal.

[0065] Figure 5 This is a schematic diagram of a signal simulation unit provided in an embodiment of this application, as shown below. Figure 5 As shown, the signal simulation unit 102 includes a first analog subunit 1021 and a second analog subunit 1022. The first analog subunit 1021 is electrically connected to the second analog subunit 1022, and the second analog subunit 1022 is electrically connected to the second signal conversion unit 1032. The first analog subunit 1021 can generate an analog drive signal, wherein the analog drive signal is used to simulate a drive signal. The second analog subunit 1022 can generate an analog signal according to the analog drive signal.

[0066] The signal simulation unit 102 includes a first simulation subunit 1021 and a second simulation subunit 1022. The first simulation subunit 1021 can simulate the driving unit 101 in the touch chip 100, and the second simulation subunit 1022 can simulate the electrode 201 and the first signal conversion unit 1031 in the recognition unit 103 connected to the electrode 201. The first simulation subunit 1021 and the second simulation subunit 1022 are electrically connected, and can simulate the driving unit 101 and the first signal conversion unit 1031 being electrically connected. The first simulation subunit 1021 can generate an analog driving signal. In one example, the analog driving signal is related to the waveform and frequency of the driving signal. Similarly, the analog drive signal can simulate the drive signal generated by the drive unit 101. The second analog subunit 1022 generates an analog signal based on the analog drive signal. Specifically, after the circuit of the analog electrode 201 in the second analog subunit 1022 receives the analog drive signal sent by the first analog subunit 1021, it generates a second sensing signal based on the analog drive signal. The circuit of the analog first signal conversion unit 1031 in the second analog subunit 1022 generates an analog signal based on the second sensing signal, so that the analog signal can simulate the reference signal generated by the first signal conversion unit 1031 based on the second sensing signal transmitted by the electrode 201 when the electronic device is not touched.

[0067] In this embodiment, the signal simulation unit 102 includes a first simulation subunit 1021 and a second simulation subunit 1022. The first simulation subunit 1021 can generate an analog drive signal, and the second simulation subunit 1022 can generate an analog signal based on the analog drive signal. Thus, the first simulation subunit 1021 can simulate the drive unit 101, and the second simulation subunit 1022 can simulate the electrode 201 and the first signal conversion unit 1031, thereby simulating the reference signal generated by the first signal conversion unit 1031 based on the second sensing signal transmitted by the electrode 201 when the electronic device is not touched.

[0068] Figure 6 This is a schematic diagram of a first analog subunit provided in an embodiment of this application, as shown below. Figure 6 As shown, the first analog subunit 1021 includes a third amplifier D3, a fifth resistor R5, and a sixth resistor R6. The output terminal of the digital-to-analog converter 1011 is connected to the non-inverting input terminal of the third amplifier D3. The first terminal of the fifth resistor R5 is connected to the inverting input terminal of the third amplifier D3, and the second terminal of the fifth resistor R5 is connected to the second analog subunit 1022. The first terminal of the sixth resistor R6 is connected to the output terminal of the third amplifier D3, and the second terminal of the sixth resistor R6 is connected to the inverting input terminal of the third amplifier D3. The output terminal of the third amplifier D3 is connected to the second analog subunit 1022.

[0069] The third amplifier D3 can simulate the second amplifier D2 in the drive unit 101. Similar to the drive unit 101, the output terminal of the third amplifier D3 is electrically connected to the second analog subunit 1022, so that the output terminal of the simulated second amplifier D2 is electrically connected to the first signal conversion unit 1031. The inverting input terminal of the third amplifier D3 is electrically connected to the second analog subunit 1022 through the fifth resistor R5, so that the inverting input terminal of the simulated second amplifier D2 is electrically connected to the first signal conversion unit 1031 through the third resistor R3. The non-inverting input terminal of the third amplifier D3 is connected to the output terminal of the digital-to-analog converter 1011, so that the non-inverting input terminal of the simulated second amplifier D2 is connected to the output terminal of the digital-to-analog converter 1011. The sixth resistor R6, as the feedback resistor of the third amplifier D3, can simulate the fourth resistor R4 as the feedback resistor of the second amplifier D2. Thus, the drive unit 101 can be simulated by the third amplifier D3, the fifth resistor R5, and the sixth resistor R6 included in the first analog subunit 1021.

[0070] It should be understood that since the second analog subunit 1022 only simulates one first signal conversion unit 1031, the first analog subunit 1021 only includes one sixth resistor R6 for simulating the third resistor R3.

[0071] In this embodiment, the first analog subunit 1021 includes a third amplifier D3, a fifth resistor R5, and a sixth resistor R6. The third amplifier D3 can simulate the second amplifier D2 in the driving unit 101, the fifth resistor R5 can simulate the third resistor R3 in the driving unit 101, and the sixth resistor R6 can simulate the fourth resistor R4 in the driving unit 101. Through a circuit connection similar to that of the driving unit 101, the first analog subunit 1021 can simulate the driving unit 101.

[0072] In one possible implementation, the resistance of the sixth resistor R6 is equal to the product of the resistance of the fifth resistor R5 and the first gain coefficient.

[0073] Since the second analog subunit 1022 only simulates one first signal conversion unit 1031, the first analog subunit 1021 only includes one fifth resistor R5 to simulate the third resistor R3. That is, the first analog subunit 1021 only includes one fifth resistor R5. Since the fifth resistor R5 simulates the third resistor R3 and the sixth resistor R6 simulates the fourth resistor R4, the calculation formula applicable to the third resistor R3 and the fourth resistor R4 also applies to the fifth resistor R5 and the sixth resistor R6. 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 sixth resistor R6 = A * the resistance value of the fifth resistor R5 / N. Since there is only one fifth resistor R5, the resistance value of the sixth resistor R6 = A * the resistance value of the fifth resistor R5. A is used to characterize the first gain coefficient.

[0074] In this embodiment, the resistance value of the sixth resistor R6 is equal to the product of the resistance value of the fifth resistor R5 and the first gain coefficient. The numerical relationship between the sixth resistor R6 and the fifth resistor R5 can be used to simulate the numerical relationship between the fourth resistor R4 and the multiple third resistors R3 in the drive unit 101. This allows the sixth resistor R6 to simulate the fourth resistor R4 in the drive unit 101, and the fifth resistor R5 to simulate the third resistor R3 in the drive unit 101. The drive unit 101 can be simulated by the first simulation subunit 1021.

[0075] Figure 7 This is a schematic diagram of a second analog subunit provided in an embodiment of this application, as shown below. Figure 7As shown, the second analog subunit 1022 includes a fourth amplifier D4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, and a third capacitor C3. The first terminal of the second capacitor C2 is grounded, and the second terminal of the second capacitor C2 is connected to the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is connected to the first terminal of the eighth resistor R8, and the second terminal of the eighth resistor R8 is connected to the inverting input terminal of the fourth amplifier D4. The first terminal of the third capacitor C3 is connected to the inverting input terminal of the fourth amplifier D4, and the second terminal of the third capacitor C3 is connected to the output terminal of the fourth amplifier D4. The first terminal of the ninth resistor R9 is connected to both the inverting input terminal of the fourth amplifier D4 and the first terminal of the third capacitor C3. The second terminal of the ninth resistor R9 is connected to both the output terminal of the fourth amplifier D4 and the second terminal of the third capacitor C3. The output terminal of the third amplifier D3 is connected to the non-inverting input terminal of the fourth amplifier D4. The output terminal of the fourth amplifier D4 is connected to the second terminal of the fifth resistor R5 and the second signal conversion unit 1032.

[0076] The second capacitor C2 and the seventh resistor R7 can simulate electrode 201. Specifically, the second capacitor C2 simulates the capacitance of electrode 201 to ground, the seventh resistor R7 simulates the resistance of electrode 201, the eighth resistor R8 is connected to the inverting input terminal of the fourth amplifier D4, thereby simulating the connection of electrode 201 to the inverting input terminal of the first amplifier D1 through the first resistor R1, the ninth resistor R9 as the feedback resistor of the fourth amplifier D4 can simulate the second resistor R2 as the feedback resistor of the first amplifier D1, the third capacitor C3 can simulate the first capacitor C1, and the output terminal of the fourth amplifier D4 is connected to the second signal converter. The switching unit 1032 and the fifth resistor R5 are connected to realize that the output terminal of the analog first amplifier D1 is connected to the second signal conversion unit 1032 and the third resistor R3 respectively. The non-inverting input terminal of the fourth amplifier D4 is connected to the output terminal of the third amplifier D3, thus realizing that the non-inverting input terminal of the analog first amplifier D1 is connected to the output terminal of the second amplifier D2. In this way, the electrode 201 and the first signal conversion unit 1031 can be simulated through the second analog subunit 1022, and the first signal conversion unit 1031 and the driving unit 101 can be simulated through the second analog subunit 1022 and the first analog subunit 1021.

[0077] In this embodiment, the second analog subunit 1022 includes a fourth amplifier D4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, and a third capacitor C3. The second capacitor C2 and the seventh resistor R7 can simulate the electrode 201 in the electronic device when it is not touched by a finger. The fourth amplifier D4, the eighth resistor R8, the ninth resistor R9, and the third capacitor C3 can simulate the first signal conversion unit 1031. Thus, the first analog subunit 1021 and the second analog subunit 1022 can simulate the driving unit 101 and the first signal conversion unit 1031. Therefore, the analog signal generated by the signal simulation unit 102 can be used to simulate the reference signal generated by the identification unit 103 based on the second sensing signal when the electronic device is not touched.

[0078] In one possible implementation, the resistance of the seventh resistor R7 is equal to the product of the average resistance of electrode 201 and the second gain coefficient; the resistance of the eighth resistor R8 is equal to the product of the resistance of the first resistor R1 and the second gain coefficient; the resistance of the ninth resistor R9 is equal to the product of the resistance of the second resistor R2 and the second gain coefficient; the capacitance of the second capacitor C2 is equal to the ratio of the average capacitance of electrode 201 to the second gain coefficient; and the capacitance of the third capacitor C3 is equal to the ratio of the capacitance of the first capacitor C1 to the second gain coefficient.

[0079] When the resistance of the resistor in the analog unit is the product of the resistance of the corresponding resistor in the first signal conversion unit 1031 and electrode 201 and the second gain coefficient, and the capacitance of the capacitor in the analog unit is the ratio of the capacitance of the corresponding capacitor in the first signal conversion unit 1031 and electrode 201 to the second gain coefficient, that is, when M represents the second gain coefficient, then the resistance of the seventh resistor R7 = the average value of the resistance of electrode 201 * M, the resistance of the eighth resistor R8 = the resistance of the first resistor R1 * M, the resistance of the ninth resistor R9 = the resistance of the second resistor R2 * M, the capacitance of the second capacitor C2 = the average value of the capacitance of electrode 201 / M, and the capacitance of the third capacitor C3 = 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: the resistance of the seventh resistor R7 equals the average resistance of electrode 201; the resistance of the eighth resistor R8 equals the resistance of the first resistor R1; the resistance of the ninth resistor R9 equals the resistance of the second resistor R2; the capacitance of the second capacitor C2 equals the average capacitance of electrode 201; and the capacitance of the third capacitor C3 equals the capacitance of the first capacitor C1.

[0080] 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 value of the second capacitor C2 only needs to be 32.5pF.

[0081] In this embodiment, the resistance value of the resistor in the analog unit 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 analog unit is the ratio of the capacitance value of the corresponding capacitor to the second gain coefficient. This can reduce the capacitance value required by the touch chip 100 under the premise of outputting the same signal, thereby reducing the production cost of the touch chip 100.

[0082] Figure 8 This is a schematic diagram of a second signal conversion unit provided in an embodiment of this application, as shown below. Figure 8 As shown, the second signal conversion unit 1032 includes a gain subunit 10321 and a calculation subunit 10322. The gain subunit 10321 is electrically connected to the first signal conversion unit 1031, and the calculation subunit 10322 is electrically connected to the gain subunit 10321 and the signal simulation unit 102, respectively.

[0083] The gain subunit 10321 can amplify the first identification sub-signal, and the calculation subunit 10322 can generate a second identification sub-signal based on the amplified first identification sub-signal and the analog signal, so that the second signal conversion unit 1032 can generate an identification signal based on the second identification sub-signal.

[0084] It should be understood that due to differences in the circuit parameters of each electrode 201 and the differences in the driving signals sent by the identification unit 103 to each electrode 201, at least some electrodes 201 will have different reference signals, meaning that at least some electrodes 201 will generate different base signals in response to the driving signals. However, the analog signal is a fixed value. After receiving the first identification sub-signal sent by the connected first signal conversion unit 1031, the gain sub-unit 10321 amplifies the first identification sub-signal. For example, it can positively amplify the first identification sub-signal with a weak base signal to increase its strength, and negatively amplify the first identification sub-signal with a strong base signal to decrease its strength. The calculation unit can generate a second identification sub-signal based on the amplified first identification sub-signal and the analog signal. In one example, a subtraction operation can be performed on the first identification sub-signal and the analog signal, and the voltage signal converted from the base signal in the amplified first identification sub-signal can be eliminated based on the analog signal to obtain the second identification sub-signal.

[0085] In this embodiment, the second signal conversion unit 1032 includes a gain subunit 10321 and a calculation subunit 10322. The gain subunit 10321 can amplify the first identification sub-signal, and the calculation subunit 10322 can generate a second identification sub-signal based on the amplified first identification sub-signal and the analog signal. The second signal conversion unit 1032 can generate an identification signal based on the second identification sub-signal, thereby realizing the generation of the identification signal. The gain subunit 10321 can adjust the intensity of the first identification sub-signal so that the signal intensity of the voltage signal converted from the base signal in the first identification sub-signal corresponds to the signal intensity of the analog signal, thereby improving the elimination effect of the voltage signal converted from the base signal in the first identification sub-signal and increasing the proportion of the voltage signal converted from the signal increment generated by finger touch in the second identification sub-signal.

[0086] Figure 9 This is a schematic diagram of another second signal conversion unit provided in an embodiment of this application, as shown below. Figure 9 As shown, the signal conversion unit also includes a differential amplifier subunit 10323, a low-pass filter subunit 10324, a buffer subunit 10325, and an analog-to-digital converter 10326. The differential amplifier subunit 10323 is electrically connected to the computing unit, the low-pass filter subunit 10324 is electrically connected to the differential amplifier subunit 10323, the buffer subunit 10325 is electrically connected to the low-pass filter subunit 10324, and the analog-to-digital converter 10326 is electrically connected to the buffer subunit 10325.

[0087] The differential amplification subunit 10323 can differentially amplify the second identification sub-signal to obtain the third identification sub-signal, and the low-pass filtering subunit 10324 can low-pass filter the third identification sub-signal to obtain the fourth identification sub-signal. The buffer subunit 10325 and the analog-to-digital converter 10326 can generate an identification signal based on the fourth identification sub-signal.

[0088] It should be understood that the embodiments of this application only provide one example of the post-processing circuit (second signal conversion unit 1032) 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.

[0089] In this embodiment, the signal conversion unit further includes a differential amplification subunit 10323, a low-pass filtering subunit 10324, a buffer subunit 10325, and an analog-to-digital converter 10326. The differential amplification subunit 10323 can differentially amplify the second identification sub-signal to obtain a third identification sub-signal. The low-pass filtering subunit 10324 can low-pass filter the third identification sub-signal to obtain a fourth identification sub-signal. The buffer subunit 10325 and the analog-to-digital converter 10326 can generate an identification signal based on the fourth identification sub-signal. This allows the second identification sub-signal to be converted into an identification signal. Since the voltage signal converted from the base signal in the second identification sub-signal is canceled out by the analog signal, at least some of the structures in the differential amplification subunit 10323, low-pass filtering subunit 10324, buffer subunit 10325, and analog-to-digital converter 10326 can be configured with a large signal gain, ensuring that the amplified signal does not exceed the dynamic range of signal detection performed by the identification unit 103, thereby improving the sensitivity of touch detection.

[0090] Figure 10 This is a schematic diagram of a display screen provided in an embodiment of this application, such as... Figure 10 As shown, the display screen 200 includes electrodes 201 and a touch chip 100 in any of the above embodiments.

[0091] 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.

[0092] Figure 11 This is a schematic diagram of an electronic device provided in an embodiment of this application, such as... Figure 11 As shown, the electronic device 300 includes a display screen 200 as described in the foregoing embodiments.

[0093] 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.

[0094] 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.

[0095] 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 drive unit, a signal simulation unit, and multiple recognition 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 driving unit is electrically connected to the plurality of recognition units respectively, and the signal simulation unit is electrically connected to the plurality of recognition units respectively; The driving unit is used to generate a driving signal and send the driving signal to the electrode; The signal simulation unit is used to generate an analog signal, wherein the analog signal is the same as the reference signal generated by the recognition unit when the electronic device is not touched; The identification unit is configured to receive a first sensing signal generated by the electrode in response to the driving signal, and generate an identification signal based on the first sensing signal and the analog signal, the identification signal being used for touch detection.

2. The touch chip according to claim 1, characterized in that, The electrode includes multiple lateral electrodes and / or multiple vertical electrodes, at least one of which serves as both a driving electrode and a receiving electrode. The touch chip sends the driving signal to the driving electrode and receives the first sensing signal output by the receiving electrode.

3. The touch chip according to claim 1, 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, the driving unit is electrically connected to the first signal conversion unit in the plurality of identification units, and the signal simulation unit is electrically connected to the second signal conversion unit in the plurality of identification units. The first signal conversion unit is configured to send the driving signal to the connected electrode, receive the first sensing signal generated by the electrode, generate a first identification sub-signal based on the first sensing signal, and receive a second sensing signal generated by the electrode when the electronic device is not touched, and generate the reference signal based on the second sensing signal. The second signal conversion unit is used to generate the identification signal based on the first identification sub-signal and the analog signal.

4. The touch chip according to claim 3, 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 connected to the electrode, the second end of the first resistor is connected to the inverting input terminal of the first amplifier, the first end of the first capacitor is connected to the inverting 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 inverting input terminal of the first amplifier and the first end of the first capacitor, and 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.

5. The touch chip according to claim 4, characterized in that, The driving unit includes: a digital-to-analog converter, a second amplifier, multiple third resistors, and a fourth resistor; The output terminal of the digital-to-analog converter is connected to the non-inverting input terminal of the second amplifier. The first terminal of the third resistor is connected to the output terminal of the first amplifier. Different third resistors are connected to different first amplifiers. The second terminal of each third resistor is connected to the inverting input terminal of the second amplifier. The first terminal of the fourth resistor is connected to the inverting input terminal of the second amplifier. The second terminal of the fourth resistor is connected to the output terminal of the second amplifier. The input terminal of the second amplifier is connected to the non-inverting input terminal of the first amplifier. The driving unit is used to generate the driving signal and send the driving signal to the non-inverting input terminal of the first amplifier in each of the first signal conversion units.

6. The touch chip according to claim 5, 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.

7. The touch chip according to claim 6, characterized in that, The signal simulation unit includes: a first simulation subunit and a second simulation subunit; The first analog subunit is electrically connected to the second analog subunit, and the second analog subunit is electrically connected to the second signal conversion unit; The first analog subunit is used to generate an analog drive signal, wherein the analog drive signal is used to simulate the drive signal; The second analog subunit is used to generate the analog signal based on the analog drive signal.

8. The touch chip according to claim 7, characterized in that, The first analog subunit includes: a third amplifier, a fifth resistor, and a sixth resistor; The output terminal of the digital-to-analog converter is connected to the non-inverting input terminal of the third amplifier, the first terminal of the fifth resistor is connected to the inverting input terminal of the third amplifier, the second terminal of the fifth resistor is connected to the second analog subunit, the first terminal of the sixth resistor is connected to the output terminal of the third amplifier, the second terminal of the sixth resistor is connected to the inverting input terminal of the third amplifier, and the output terminal of the third amplifier is connected to the second analog subunit.

9. The touch chip according to claim 8, characterized in that, The resistance value of the sixth resistor is equal to the product of the resistance value of the fifth resistor and the first gain coefficient.

10. The touch chip according to claim 8, characterized in that, The second analog subunit includes: a fourth amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, and a third capacitor; The first terminal of the second capacitor is grounded, the second terminal of the second capacitor is connected to the first terminal of the seventh resistor, the second terminal of the seventh resistor is connected to the first terminal of the eighth resistor, the second terminal of the eighth resistor is connected to the inverting input terminal of the fourth amplifier, the first terminal of the third capacitor is connected to the inverting input terminal of the fourth amplifier, the second terminal of the third capacitor is connected to the output terminal of the fourth amplifier, the first terminal of the ninth resistor is connected to both the inverting input terminal of the fourth amplifier and the first terminal of the third capacitor, the second terminal of the ninth resistor is connected to both the output terminal of the fourth amplifier and the second terminal of the third capacitor, the output terminal of the third amplifier is connected to the non-inverting input terminal of the fourth amplifier, and the output terminal of the fourth amplifier is connected to both the second terminal of the fifth resistor and the second signal conversion unit.

11. The touch chip according to claim 10, characterized in that, The resistance of the seventh resistor is equal to the product of the average resistance of the electrodes and the second gain coefficient; the resistance of the eighth resistor is equal to the product of the resistance of the first resistor and the second gain coefficient; the resistance of the ninth resistor is equal to the product of the resistance of the second resistor and the second gain coefficient; the capacitance of the second capacitor is equal to the ratio of the average capacitance of the electrodes to the second gain coefficient; and the capacitance of the third capacitor is equal to the ratio of the capacitance of the first capacitor to the second gain coefficient.

12. The touch chip according to any one of claims 3-11, characterized in that, The second signal conversion unit includes: a gain subunit and a calculation subunit; The gain subunit is electrically connected to the first signal conversion unit, and the calculation subunit is electrically connected to both the gain subunit and the signal analog unit. The gain subunit is used to amplify the first identification sub-signal; The calculation subunit is used to generate a second identification subsignal based on the first identification subsignal after gain and the analog signal, so that the second signal conversion unit generates the identification signal based on the second identification subsignal.

13. The touch chip according to claim 12, characterized in that, The second signal conversion unit further includes: a differential amplifier unit, a low-pass filter unit, a buffer unit, and an analog-to-digital converter; The differential amplifier unit is electrically connected to the computing subunit, the low-pass filter unit is electrically connected to the differential amplifier unit, the buffer unit is electrically connected to the low-pass filter unit, and the analog-to-digital converter is electrically connected to the buffer unit. The differential amplification unit is used to differentially amplify the second identification sub-signal to obtain the third identification sub-signal; The low-pass filtering unit is used to perform low-pass filtering on the third identification sub-signal to obtain the fourth identification sub-signal; The buffer unit and the analog-to-digital converter are used to generate the identification signal based on the fourth identification sub-signal.

14. A display screen, characterized in that, It includes electrodes and a touch chip as described in any one of claims 1-13.

15. An electronic device, characterized in that, Includes the display screen as described in claim 14.

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