Touch-control apparatus, touch-control chip, display screen module, and electronic device

Abstract

Provided in the embodiments of the present application are a touch-control apparatus, a touch-control chip, a display screen module, and an electronic device. The touch-control apparatus comprises: a touch-control chip and a touch-control module, wherein the touch-control chip is used for outputting a first driving signal to the touch-control module, and the touch-control module is used for receiving the first driving signal. When touch control is being performed by a finger, the touch-control module, the finger, a human body and an electrode on a touch screen form a closed loop, and the touch-control module couples the first driving signal to the human body in a non-contact manner, such that the first driving signal sequentially passes through the human body and the finger, and is then transmitted into the closed loop, thereby generating an inductive signal in the closed loop, and the touch-control chip identifies a touch-control position on the basis of the inductive signal. The touch-control apparatus provided in the present application is applicable to touch-control position identification in a hover touch scenario.

Description

Touch devices, touch chips, display screen modules and electronic devices

[0001] This application claims priority to the invention application filed on May 30, 2024, with application number "PCT / CN2024 / 096492" and patent title "Touch Device, Touch Chip, Display Screen Module and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electrical engineering technology, and in particular to a touch device, a touch chip, a display screen module, and an electronic device. Background Technology

[0003] A car center console display is an integrated in-vehicle display device that can perform various functions, such as navigation, multimedia playback, and driving information display. Car center console displays are typically operated via touchscreen, allowing drivers or passengers to easily access these functions.

[0004] Currently, automotive central control displays recognize touch commands through the self-capacitance and / or mutual capacitance of the electrodes included in the display.

[0005] However, since the user's finger needs to touch the touch screen when recognizing touch commands through electrode self-capacitance and / or mutual capacitance, touching the car's central control display screen while driving can easily cause driving accidents, resulting in low driving safety.

[0006] Summary of the Invention

[0007] In view of this, embodiments of this application provide a touch device, a touch chip, a display screen module, and an electronic device to at least partially solve the above-mentioned problems.

[0008] According to a first aspect of the present application, a touch device is provided, comprising: a touch chip and a touch module; the touch chip is configured to output a first driving signal to the touch module; the touch module is configured to receive the first driving signal, wherein when a finger performs touch, the touch module, the finger, the human body, and electrodes on the touch screen form a closed loop, the touch module non-contactly couples the first driving signal to the human body, so that the first driving signal is transmitted sequentially through the human body and the finger to the closed loop to generate a sensing signal in the closed loop, and the touch chip performs touch position recognition based on the sensing signal.

[0009] According to a second aspect of the present application, a touch chip is provided. The touch chip is used to output a first driving signal to a touch module, and according to the touch module receiving the first driving signal, and when a finger touches the screen, the touch module, the finger, the human body, and the electrodes on the touch screen form a closed loop, the touch module non-contactly couples the first driving signal to the human body, so that the first driving signal is transmitted sequentially through the human body and the finger to the closed loop, and the sensing signal generated in the closed loop is used for touch position recognition.

[0010] According to a third aspect of the present application, a display screen module is provided, including electrodes and a touch device as described in the first aspect of the present application; when a finger touches the screen, the electrodes form a closed loop with the touch module, the human body and the finger, wherein the electrodes include horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0011] According to a fourth aspect of the present application, an electronic device is provided, including a processor and a display screen module as described in the second aspect of the present application; the processor is electrically connected to the display screen module; the processor is configured to send a switching signal to the touch device, so that the touch chip in the touch device outputs a first driving signal to the touch module or outputs a second driving signal to the electrode.

[0012] According to a fifth aspect of the embodiments of this application, applied to an automobile, the touch device includes: a touch chip and a touch module, the touch module including metal electrodes disposed on an automobile seat and / or metal wires disposed in an automobile steering wheel; the touch chip is used to output a first driving signal to the touch module; the touch module is used to receive the first driving signal and, when a finger touches the screen, to non-contactly couple the first driving signal to the human body, so as to transmit the first driving signal to the finger through the human body, so that the finger senses the electrodes on the touch screen to form a sensing signal, and the touch chip performs touch position recognition based on the sensing signal.

[0013] According to the touch device provided in the embodiments of this application, the touch chip outputs a first driving signal to the touch module, and the touch module receives the first driving signal. When the finger touches the screen, the touch module, the human body, the finger, and the electrode form a closed loop. The touch module non-contactly couples the first driving signal to the human body, so that the first driving signal is transmitted to the closed loop sequentially through the human body and the finger. An induction signal can be generated within the closed loop. Thus, the touch chip can identify the touch position based on the induction signal. Since the first driving signal is directly coupled to the human body, and the human body transmits the first driving signal to the finger, and then to the electrode, causing the electrode to generate an induction signal, compared with the prior art of touch position identification through electrode self-capacitance or mutual capacitance, when the finger is far away, the electrode can receive the first driving signal through equivalent capacitance. Therefore, this touch device can be applied to hover gesture touch, and can realize touch operation without the finger touching the touch screen, which can improve driving safety. Attached Figure Description

[0014] 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.

[0015] Figure 1 is a schematic diagram of a touch device provided in an embodiment of this application;

[0016] Figure 2 is a schematic diagram of a touch device in conventional mode provided in an embodiment of this application;

[0017] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of this application;

[0018] Figure 4 is a schematic diagram of a touch device including a signal amplification module provided in an embodiment of this application;

[0019] Figure 5 is a schematic diagram of a touch module provided in an embodiment of this application;

[0020] Figure 6 is a schematic diagram of an equivalent circuit provided in an embodiment of this application;

[0021] Figure 7 is a schematic diagram of a signal detection timing provided in an embodiment of this application;

[0022] Figure 8 is a schematic diagram of a detection loop provided in an embodiment of this application;

[0023] Figure 9 is a schematic diagram of simultaneous touch detection and contact detection provided in an embodiment of this application;

[0024] Figure 10 is a schematic diagram of a contact detection method provided in an embodiment of this application;

[0025] Figure 11 is a schematic diagram of another touch chip provided in an embodiment of this application;

[0026] Figure 12 is a circuit diagram of a current conversion unit provided in an embodiment of this application;

[0027] Figure 13 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0028] Figure 14 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0029] Figure 15 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0030] Figure 16 is a schematic diagram of a demodulation circuit provided in an embodiment of this application;

[0031] Figure 17 is a schematic diagram of an IQ demodulation principle provided in an embodiment of this application;

[0032] Figure 18 is a schematic diagram of an IQ demodulation bandwidth frequency response curve provided in an embodiment of this application;

[0033] Figure 19 is a schematic diagram of a display screen module provided in an embodiment of this application;

[0034] Figure 20 is a schematic diagram of an electronic device provided in an embodiment of this application;

[0035] Figure 21 is a schematic diagram of the switching principle of an electronic device provided in an embodiment of this application. Detailed Implementation

[0036] 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 thoroughly 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.

[0037] As mentioned earlier, a car's central control display screen is an integrated in-vehicle display device that can perform various functions, such as navigation, multimedia playback, and driving information display. Car central control displays are typically operated via touch, allowing drivers or passengers to easily access these functions. Currently, car central control displays recognize touch commands through self-capacitance and / or mutual capacitance electrodes integrated into the display screen. However, because recognizing touch commands through self-capacitance and / or mutual capacitance requires the user's finger to touch the screen, touching the car's central control display screen while driving can easily lead to traffic accidents, resulting in low driving safety.

[0038] This application provides a touch control device. A touch chip outputs a first driving signal to a touch module. The touch module receives the first driving signal. When a finger touches the screen, the touch module, the human body, the finger, and the electrodes form a closed loop. The touch module non-contactly couples the first driving signal to the human body, allowing the first driving signal to be transmitted sequentially through the human body and the finger to the closed loop. An induction signal can be generated within the closed loop. Thus, the touch chip can identify the touch position based on the induction signal. Since the first driving signal is directly coupled to the human body, and then transmitted from the human body to the finger and then to the electrodes, causing the electrodes to generate an induction signal, compared with the prior art of touch position identification through electrode self-capacitance or mutual capacitance, when the finger is far away, the electrodes can receive the first driving signal through equivalent capacitance. Therefore, this touch control device is suitable for hover gesture touch control, enabling touch operation without the finger touching the touch screen, which can improve driving safety.

[0039] The touch device provided in this application is described below through embodiments.

[0040] Figure 1 is a schematic diagram of a touch device provided in an embodiment of this application. As shown in Figure 1, the touch device 100 includes a touch chip 101 and a touch module 102. The touch chip 101 can output a first driving signal to the touch module 102, and the touch module 102 can receive the first driving signal. When a finger touches the screen, the touch module 102, the finger, the human body, and the electrodes 401 on the touch screen form a closed loop. The touch module 102 non-contactly couples the first driving signal to the human body, so that the first driving signal is transmitted sequentially through the human body and the finger into the closed loop to generate a sensing signal in the closed loop. The touch chip 101 performs touch position recognition based on the sensing signal.

[0041] The touch device 100 includes a touch chip 101 and a touch module 102. The touch chip 101 can be electrically connected to the touch module 102. The touch chip 101 can output a first driving signal to the touch module 102. In one example, the first driving signal can be a voltage signal, a sine wave signal, a square wave signal, a trapezoidal wave signal, etc.

[0042] The touch module 102 can receive a first driving signal. When a finger touches the touchscreen, the finger, touch module 102, human body, and electrode 401 form a closed loop. Specifically, there is an equivalent capacitance between the touch module 102 and the human body, the human body can conduct electricity equivalent to an equivalent resistance, and there is an equivalent capacitance between the finger and electrode 401. Thus, the touch module 102, the equivalent capacitance between the touch module 102 and the human body, the human body, the finger, the equivalent capacitance between the finger and electrode 401, and electrode 401 form a closed loop. Because the touch module 102 receives... The first driving signal is coupled to the human body through non-contact (equivalent capacitance) by the touch module 102. The first driving signal is transmitted to the closed loop through the human body and fingers in sequence. For example, when the left hand touches the electronic device and the right hand touches it, the touch module 102 non-contactly couples the first driving signal to the left hand through the equivalent capacitance between the touch module 102 and the left hand. The first driving signal flows to the human body through the left hand and is then transmitted to the closed loop through the right hand fingers. A sensing signal can be generated in the closed loop.

[0043] It should be understood that the touch chip in this embodiment does not output the first driving signal to the electrode 401, but transmits the first driving signal to the human body through non-contact coupling, and the human body transmits it to the finger. When the finger does not touch, there is no signal in the electrode 401, for example, no current signal or voltage signal. When the finger touches, the first driving signal is transmitted to the electrode 401, and a sensing signal is generated in the electrode 401. Thus, the touch position can be identified based on the location of the electrode 401 that generates the sensing signal.

[0044] It should be noted that since the first driving signal output by the touch chip 101 needs to pass through the human body and fingers in sequence, and the human body and fingers are equivalent to a large resistance, the signal amplitude of the first driving signal transmitted in the closed loop is smaller than the signal amplitude of the first driving signal output by the touch chip 101, but it will not change the waveform of the signal.

[0045] The touch chip 101 is electrically connected to the electrode 401. After receiving the sensing signal transmitted by the electrode 401, the touch chip 101 can identify the touch position based on the sensing signal. In one example, the touch chip 101 can convert the sensing signal into a digital signal and send the digital signal to the processor of the electronic device, thereby realizing touch position recognition.

[0046] In this embodiment, the touch chip 101 outputs a first driving signal to the touch module 102, and the touch module 102 receives the first driving signal. When a finger touches the screen, the touch module 102, the human body, the finger, and the electrode 401 form a closed loop. The touch module 102 non-contactly couples the first driving signal to the human body, allowing the first driving signal to be transmitted sequentially through the human body and the finger to the closed loop. A sensing signal can be generated within the closed loop, thereby allowing the touch chip 101 to identify the touch position based on the sensing signal. Since the first driving signal is directly coupled to the human body, and then transmitted from the human body to the finger, and then to the electrode 401, causing the electrode 401 to generate a sensing signal, compared with the prior art of identifying the touch position through the self-capacitance or mutual capacitance of the electrode 401, when the finger is far away, the electrode 401 can receive the first driving signal through the equivalent capacitance. Therefore, this touch device 100 is suitable for hover gesture touch control, and can realize touch operation without the finger touching the touch screen, which can improve driving safety.

[0047] Figure 2 is a schematic diagram of a touch device in conventional mode provided in an embodiment of this application. As shown in Figure 2, when the touch chip 101 receives a switching signal from the processor in the electronic device, the touch chip 101 stops outputting the first driving signal to the touch module 102, and the touch chip 101 sends a second driving signal to the electrode 401, and performs position recognition based on the touch signal output by the electrode 401. The electrode 401 includes multiple horizontal electrodes and / or multiple vertical electrodes.

[0048] When the touch chip 101 receives the switching signal from the processor, it switches from the floating touch mode to the regular touch mode. The touch chip 101 stops outputting the first driving signal, and the touch module 102 stops sensing. The touch chip 101 then outputs a second driving signal to the electrode 401. The second driving signal can be a sine wave, a square wave, or a trapezoidal wave, etc. When the electrode 401 receives the second driving signal, it generates a sensing signal, and the touch chip 101 identifies the touch position based on the sensing signal.

[0049] It should be understood that, as shown in Figure 2, the multiple electrodes 401 include multiple horizontal electrodes and / or multiple vertical electrodes. The touch chip 101 is electrically connected to each electrode 401. When the multiple horizontal electrodes and / or multiple vertical electrodes generate sensing signals, the touch chip 101 can detect the sensing signals generated in the multiple horizontal electrodes and / or multiple vertical electrodes.

[0050] In this embodiment, when the touch chip 101 receives a switching signal, the touch chip 101 stops outputting the first driving signal and outputs the second driving signal to the electrode 401. This makes it suitable for touch position recognition in everyday use scenarios. Since the regular touch mode and the floating touch mode are switched according to the switching signal, it is suitable for touch position recognition in both everyday and floating touch scenarios. It is applicable to touch position recognition in a variety of use scenarios and has high applicability.

[0051] In one possible implementation, when the electronic device is in hover touch mode, the touch chip 101 outputs a first driving signal to the touch module 102, and when the electronic device is in non-hover touch mode, the touch chip 101 sends a second driving signal to the electrode 401.

[0052] When the electronic device is in hover touch mode, the touch chip 101 outputs a first driving signal, and the touch module 102 receives the first driving signal. When a finger touches the touch screen, the finger, touch module 102, human body, and electrode 401 form a closed loop. Specifically, there is an equivalent capacitance between the touch module 102 and the human body, the human body can conduct electricity equivalent to an equivalent resistance, and there is an equivalent capacitance between the finger and electrode 401. Thus, the touch module 102, the equivalent capacitance between the touch module 102 and the human body, the human body, the finger, the equivalent capacitance between the finger and electrode 401, and electrode 401 form a closed loop. Block 102 receives the first driving signal, so the touch module 102 can couple the first driving signal to the human body in a non-contact manner (equivalent capacitance), so that the first driving signal is transmitted to the closed loop through the human body and fingers in sequence, generating an induction signal. For example, when the left hand holds the electronic device and touches it with the fingers of the right hand, the touch module 102 couples the first driving signal to the left hand in a non-contact manner through the equivalent capacitance between the touch module 102 and the left hand. After the first driving signal flows through the left hand to the human body, it is transmitted to the closed loop through the fingers of the right hand, and an induction signal can be generated in the closed loop.

[0053] When the electronic device is in non-floating touch mode, the touch chip 101 stops outputting the first driving signal. At this time, the touch module 102 cannot receive the first driving signal, and the touch module 102 stops sensing. Then, the touch chip 101 outputs a second driving signal to the electrode 401. The second driving signal can be a sine wave, a square wave, or a trapezoidal wave, etc. When the electrode 401 receives the second driving signal, it generates a sensing signal, and the touch chip 101 identifies the touch position based on the sensing signal.

[0054] In one example, the hover touch mode and the non-hover touch mode can be switched by clicking the mode switching button displayed on the display screen of the electronic device. Specifically, after clicking the mode switching button displayed on the display screen, the processor of the electronic device sends a switching signal to the touch chip 101 to realize the switching between the hover touch mode and the non-hover touch mode.

[0055] In this embodiment, when the electronic device is in hover touch mode, the touch chip 101 outputs a first driving signal. When the electronic device is in non-hover touch mode, the touch module 101 sends a second driving signal to the electrode 401. Thus, the electronic device can switch between hover touch mode and non-hover touch mode. Therefore, this touch device is applicable to touch position recognition in daily scenarios and hover touch scenarios, and can be used for touch position recognition in various usage scenarios, with high applicability.

[0056] In one possible implementation, the touch chip 101 sends a second drive signal to one of a plurality of horizontal electrodes and a plurality of vertical electrodes, and performs position recognition based on the touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes.

[0057] One of the multiple horizontal electrodes and multiple vertical electrodes serves as the driving electrode. The touch chip 101 outputs a driving signal to the driving electrode. The other of the multiple horizontal electrodes and multiple vertical electrodes serves as the receiving electrode and outputs a sensing signal. The touch chip 101 performs touch recognition based on the sensing signal and can identify the touch position of the finger. This method is a mutual capacitance detection method.

[0058] In addition, in another possible implementation, a self-capacitance detection method can be superimposed to identify the touch position of the finger. At least one of the multiple horizontal electrodes and multiple vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip 101 sends a driving signal to the driving electrode and performs position identification based on the sensing signal output by the receiving electrode. For example, the touch chip 101 outputs driving signals to multiple horizontal electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple horizontal electrodes (receiving electrodes); or the touch chip 101 outputs driving signals to multiple vertical electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple vertical electrodes (receiving electrodes); or the touch chip 101 simultaneously outputs driving signals to multiple horizontal electrodes and multiple vertical electrodes and simultaneously receives the sensing signals output by the multiple horizontal electrodes and multiple vertical electrodes. The touch chip 101 performs touch position identification based on the received sensing signals.

[0059] In this embodiment, when the touch chip 101 receives a switching signal, the touch chip stops outputting the first driving signal and outputs the second driving signal to the electrode 401. Thus, the touch position can be identified by the electrode 401 using self-capacitance or mutual capacitance. This is applicable to touch position identification in everyday use scenarios. Since the everyday scenario and the floating touch scenario are switched according to the switching signal, it is applicable to touch position identification in both everyday and floating touch scenarios. The touch device 100 is applicable to touch position identification in a variety of use scenarios and has high applicability.

[0060] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of this application. As shown in Figure 3, the touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is electrically connected to a first pin 1011. One end of the second switch K2 is connected to the first pin 1011, and the other end of the second switch K2 is grounded. When the first switch K1 is closed and the second switch K2 is open, the touch chip 101 outputs a first driving signal to the touch module 102 through the first pin 1011. When the first switch K1 is open and the second switch K2 is closed, the touch chip 101 stops outputting the first driving signal to the touch module 102 and sends a second driving signal to the electrode 401.

[0061] The touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is disposed between the first signal generator 1012 and the first pin 1011. One end of the first pin 1011 is connected to the first switch K1, and the other end of the first pin 1011 is electrically connected to the touch module 102. One end of the second switch K2 is connected to the first pin 1011, and the other end of the second switch K2 is grounded. When the first switch K1 is closed and the second switch K2 is open, the first signal generator 1012 in the touch chip 101 generates a first driving signal and transmits the first driving signal to the first pin 1011 through the closed first switch K1. The first pin 1011 sends the first driving signal to the touch module 102 which is electrically connected to the first pin 1011, thereby enabling touch position recognition in a floating touch scenario.

[0062] When the second switch K2 is closed, the touch module 102 is grounded through the first pin 1011 and the closed second switch K2. At this time, the touch module 102 is short-circuited by the ground wire, and the touch chip 101 stops outputting the first drive signal to the touch module 102. It should be understood that when the second switch K2 is closed, in order to prevent the touch chip 101 from leaking current to the ground wire, the first switch K1 will be opened. After the touch chip 101 stops outputting the first drive signal to the touch module 102, it outputs the second drive signal to the electrode 401, so that touch position recognition can be performed in daily scenarios.

[0063] In this embodiment, the touch chip 101 includes a first switch K1 and a second switch K2. When the first switch K1 is closed and the second switch K2 is open, the touch chip 101 outputs a first driving signal to the touch module 102. When the first switch K1 is open and the second switch K2 is closed, the touch chip 101 sends a second driving signal to the electrode 401. This enables switching between the floating touch recognition mode and the daily touch recognition mode. Since the touch chip 101 can control the on / off state of the first switch K1 and the second switch K2 according to the switching signal sent by the processor, it can be used for touch position recognition in both daily and floating touch scenarios. The touch device 100 can be used for touch position recognition in various usage scenarios and has high applicability.

[0064] Figure 4 is a schematic diagram of a touch device including a signal amplification module provided in an embodiment of this application. As shown in Figure 4, the touch device 100 further includes a signal amplification module 103. The input terminal of the signal amplification module 103 is connected to the first pin 1011, and the output terminal of the signal amplification module 103 is connected to the touch module 102. The signal amplification module 103 can amplify the level of the first driving signal and send the amplified first driving signal to the touch module 102. When a finger touches the screen, the touch module 102 non-contactly couples the amplified first driving signal to the human body, so that the amplified first driving signal is transmitted sequentially through the human body and the finger into a closed loop.

[0065] The signal amplification module 103 can amplify the first driving signal output by the touch chip 101. The input terminal of the signal amplification module 103 receives the first driving signal output by the touch chip 101 through the first pin 1011, then amplifies the first driving signal, and sends the amplified first driving signal to the touch module 102. Thus, the touch module 102 non-contactly couples the amplified first driving signal to the human body, so that the amplified first driving signal is transmitted sequentially through the human body and the finger into the closed loop. The closed loop generates a sensing signal based on the amplified first driving signal.

[0066] In one example, the difference between the peak and trough of the first driving signal before signal amplification is [1Vpp, 10Vpp], that is, the difference between the high level and the low level is between 1Vpp and 10Vpp. The difference between the peak and trough of the first driving signal after signal amplification is [1Vpp, 30Vpp], that is, the difference between the high level and the low level is between 1Vpp and 30Vpp.

[0067] In this embodiment, the touch device 100 also includes a signal amplification module 103, which amplifies the first driving signal output by the touch chip 101, thereby increasing the signal amplitude of the first driving signal. This allows the larger amplitude first driving signal to be non-contactly coupled to the human body, and the larger amplitude first driving signal is transmitted sequentially through the human body and finger into a closed loop, resulting in a larger amplitude of the generated sensing signal and improving the sensitivity of the touch device 100 in recognizing the touch position.

[0068] In one possible implementation, the touch module 102 includes metal electrodes disposed on the car seat and / or metal wires disposed in the car steering wheel.

[0069] Figure 5 is a schematic diagram of a touch module provided in an embodiment of this application. As shown in Figure 5, (a) shows a metal electrode 1021 on a car seat as a touch module 102, and (b) shows a metal wire 1022 in a car steering wheel as a touch module 102.

[0070] When hovering touch, the human body is insulated from the touch module. For example, in Figure 5(a), a human body can sit on the car seat, and the human body is in contact with the car seat, meaning the human body is insulated from the metal electrode 1021 in the car seat. In Figure 5(b), a hand is placed on the car steering wheel, meaning the human body is insulated from the metal wire 1022 in the car steering wheel. In one example, Figure 6 is a schematic diagram of an equivalent circuit provided in an embodiment of this application. As shown in Figure 6, when the finger 301 touches, there is an equivalent capacitance between the touch module 102 and the human body 300. The touch module 102, the human body 300, the finger 301, and the electrode 401 form a closed loop. The electrode 401 can be a lateral electrode. And / or vertical electrodes, in Figure 6, the equivalent signal source L1 is the first driving signal received by the touch module 102, the capacitor CHM is the equivalent capacitance between the touch module 102 and the human body 300, the capacitor CHT is the equivalent capacitance between the finger 301 and the electrode 401, and the resistor Rm is the equivalent resistance of the human body. The touch module 102 non-contactly couples the first driving signal to the human body 300, and the human body 300 transmits the first driving signal to the finger 301. The finger 301 and the electrode 401 are mutually capacitive, which causes the signal in the closed loop to change, that is, to generate a sensing signal. The electrode 401 sends the sensing signal to the touch chip 101 through the pins of the touch chip 101. The touch chip 101 performs touch position recognition according to the sensing signal.

[0071] Figure 7 is a schematic diagram of a signal detection timing provided in an embodiment of this application. As shown in Figure 7, a first driving signal with a duration of t1 is output to the touch module 102. During the time interval 0-t1, signal detection is performed on the vertical electrode in the electrode 401 to determine the vertical coordinate of the touch position. Then, the first driving signal with a duration of t1 is output to the touch module 102 again. During the time interval from t1 to 2*t1, signal detection is performed on the horizontal electrode in the electrode 401 to determine the horizontal coordinate of the touch position. Thus, the horizontal and vertical coordinates of the touch position can be detected within a time interval of 2*t1, and the touch position can be determined.

[0072] In this embodiment, the touch module 102 includes metal electrodes disposed on the car seat and / or metal wires disposed in the car steering wheel. Thus, when the finger touches the screen, the metal electrodes disposed on the car seat and / or the metal wires disposed in the car steering wheel form a closed loop with the human body, the finger and the electrode 401. The touch module 102 sequentially couples the first driving signal to the human body in a non-contact manner, so that the first driving signal is transmitted to the closed loop sequentially through the human body and the finger, thereby realizing the floating touch control of the car's central control display screen.

[0073] In one possible implementation, a metal wire installed in the car steering wheel is used to heat the car steering wheel.

[0074] In this embodiment, the metal wire installed in the car steering wheel can be used to heat the car steering wheel. Since car manufacturers will install metal wires for steering wheel heating in the car steering wheel, the metal wires installed in the car steering wheel can be reused without the need to install extra metal wires, which is low cost.

[0075] In one possible implementation, when the touch module 102 includes a metal wire disposed in the car steering wheel, the touch chip 101 is used to output a third driving signal. The touch module 102 receives the third driving signal and generates a first current signal. After the human body at least partially contacts the car steering wheel, the touch module 102 non-contactly couples the third driving signal to the human body and generates a second current signal. The touch chip 101 performs car steering wheel contact detection based on the first current signal or the second current signal.

[0076] When the touch module 102 includes the metal wire in the car steering wheel, the touch chip 101 outputs a third driving signal to the metal wire. In one example, the third driving signal can be a sine wave driving signal. When the human body is not in contact with the car steering wheel, the metal wire receives the third driving signal. Since the metal wire is grounded, the touch chip 101, the touch module 102 (the metal wire in the car steering wheel), and the ground wire form a detection circuit. Because the metal wire receives the third driving signal, a first current signal is generated in the detection circuit. After the human body at least partially contacts the car steering wheel, for example, by holding the steering wheel with one hand or both hands, the metal wire and the human body in contact with the car steering wheel generate self-capacitance. Specifically, there is an equivalent capacitance between the touch module 102 (the metal wire in the car steering wheel) and the human body in contact with the car steering wheel. The touch module 102 non-contactly couples the third driving signal to the human body. The third driving signal is transmitted to the human body. At this time, the touch chip 101, the touch module 102 (the metal wire in the car steering wheel), and the human body form a detection circuit. That is, the equivalent resistance and equivalent capacitance of the human body are added to the original detection circuit, so that the first current signal generated in the detection circuit when the human body is not in contact with the car steering wheel changes to the second current signal. Thus, the touch chip 101 can perform car steering wheel contact detection according to the first current signal or the second current signal. Specifically, the touch chip 101 can detect that the human body is not in contact with the car steering wheel according to the first current signal, and can detect whether the human body is in contact with the car steering wheel with one hand or both hands according to the magnitude of the second current signal.

[0077] In one example, Figure 8 is a schematic diagram of a detection circuit provided in an embodiment of this application. As shown in Figure 8, when a human body at least partially contacts the steering wheel of a car, there are equivalent capacitances between the human body and the touch module 102 and equivalent resistances between the human body and the touch module 102 in the detection circuit. The capacitance CHM is the equivalent capacitance between the human body and the touch module 102, and the resistance Rm is the equivalent resistance of the human body, which causes the current in the detection circuit to change. In one example, the signal generator 1012 may include a signal generation unit 10121 and a driving unit 10122. The signal generation unit 10121 can generate a signal, and the driving unit 10122 can convert the signal into a first driving signal or a third driving signal. The touch chip 101 may include a current conversion unit 1013, which can convert the first current signal or the second current signal.

[0078] Optionally, Figure 9 is a schematic diagram of simultaneous touch detection and contact detection provided in an embodiment of this application. As shown in Figure 9, the third driving signal can be the first driving signal. After receiving the first driving signal, the touch module 102 (the metal wire in the car steering wheel) can generate a first current signal based on the first driving signal, and generate a second current signal after the human body 300 at least partially contacts the car steering wheel. At this time, if the finger 301 touches the steering wheel, the first driving signal is transmitted to the electrode 401, causing the electrode 401 to generate a sensing signal. The touch chip 101 can perform contact detection of the car steering wheel based on the first current signal or the second current signal, and can also identify the touch position based on the sensing signal, thereby enabling simultaneous contact detection and touch position identification. The dark dashed line in Figure 9 represents the touch detection path, and the light dashed line represents the contact detection path.

[0079] In one example, capacitive and resistive impedances can be detected based on a first or second current signal, thereby determining whether a human body is in contact with the car steering wheel. Specifically, Figure 10 is a schematic diagram of contact detection provided in an embodiment of this application. As shown in Figure 10, the magnitudes of capacitive impedance Ce and resistive impedance Re can be used to determine whether a human body is in contact with the steering wheel with one hand, both hands, or no contact at all. It can also be determined whether an object, such as a water bottle or steering wheel weight, is in contact with the car steering wheel. In one example, the detected capacitive impedance Ce and resistive impedance Re can be queried using big data to determine the contact detection result corresponding to these two impedances.

[0080] In this embodiment, when the touch module 102 includes a metal wire disposed in the car steering wheel, the touch chip 101 can output a third driving signal. The touch module 102 receives the third driving signal, generates a first current signal, and generates a second current signal after at least part of the human body contacts the car steering wheel. Thus, the car steering wheel contact detection can be performed based on the first current signal or the second current signal. Since the capacitive impedance and resistive impedance are detected by the current signal, the area of ​​contact between the human body and the steering wheel can be detected, and it can be detected whether the human body is in contact with the car steering wheel or whether an object is in contact with the car steering wheel. Compared with the car steering wheel contact detection in the prior art, it can detect whether an object is in contact with the car steering wheel, which can prevent the situation in the prior art where auxiliary items such as counterweights cause false detection of human body contact with the car steering wheel, thereby improving driving safety.

[0081] Figure 11 is a schematic diagram of another touch chip provided in an embodiment of this application. As shown in Figure 11, the touch chip 101 includes a current conversion unit 1013 and a processing unit 1014. The current conversion unit 1013 can generate a first identification signal based on a sensing signal, or generate a second identification signal based on a first current signal or a second current signal. The processing unit 1014 can perform touch position identification based on the first identification signal, or perform car steering wheel contact detection based on the second identification signal.

[0082] In one example, the touch chip 101 may include a plurality of current conversion units 1013, some of which are used to generate a first identification signal based on a sensing signal, and some of which are used to generate a second identification signal based on a first current signal or a second current signal.

[0083] In this embodiment, the touch chip 101 includes a current conversion unit 1013 and a processing unit 1014. The current conversion unit 1013 can receive a sensing signal and convert it into a first identification signal, or receive a first current signal or a second current signal and convert it into a second identification signal. The processing unit 1014 can identify the touch position based on the first identification signal, thereby realizing the identification of the touch position. Alternatively, the processing unit 1014 can detect the contact of the car steering wheel based on the second identification signal, thereby realizing contact detection.

[0084] Figure 12 is a circuit diagram of a current conversion unit provided in an embodiment of this application. As shown in Figure 12, the current conversion unit 1013 includes a transimpedance amplifier D1, a first resistor R1, a second resistor R2, a first feedback resistor Rf1, a second feedback resistor Rf2, a first capacitor C1, a second capacitor C2, and an analog-to-digital converter 10131. The first end of the first resistor R1 serves as the input terminal of the current conversion unit, and the second end of the first resistor R1 is connected to the positive input terminal of the transimpedance amplifier D1. The first end of the second resistor R2 is connected to the reference voltage VCMI, and the second end of the second resistor R2 is connected to the negative input terminal of the transimpedance amplifier D1. The negative output terminal of the transimpedance amplifier D1 is connected to the first input terminal of the analog-to-digital converter 10131, and the positive output terminal of the transimpedance amplifier D1 is connected to the second input terminal of the analog-to-digital converter 10131. The first end of the first feedback resistor Rf1 is connected to the positive input terminal of the transimpedance amplifier D1. The second terminal of the second feedback resistor Rf1 is connected to the negative output terminal of the transimpedance amplifier D1. The first terminal of the second feedback resistor Rf2 is connected to the negative input terminal of the transimpedance amplifier D1, and the second terminal of the second feedback resistor Rf2 is connected to the positive output terminal of the transimpedance amplifier D1. The first terminal of the first capacitor C1 is connected to the first terminal of the first feedback resistor Rf1, and the second terminal of the first capacitor C1 is connected to the second terminal of the first feedback resistor Rf1. The first terminal of the second capacitor C2 is connected to the first terminal of the second feedback resistor Rf2, and the second terminal of the second capacitor C2 is connected to the second terminal of the second feedback resistor Rf2. The transimpedance amplifier D1 can convert the induced signal into a first identification voltage, or convert a first current signal or a second current signal into a second identification voltage. The analog-to-digital converter 10131 can receive the first identification voltage and convert it into a first identification signal, or receive the second identification voltage and convert it into a second identification signal.

[0085] When the current conversion unit 1013 receives the sensing signal and converts the sensing signal into a first identification signal, the first end of the first resistor R1 is connected to the electrode 401 as the input end of the current conversion unit 1013. When the current conversion unit 1013 receives the first current signal or the second current signal and converts the first current signal or the second current signal into a second identification signal, the first end of the first resistor R1 is connected to the touch module 102 as the input end of the current conversion unit 1013.

[0086] In one example, the induced signal is a current signal. The current signal (one of the induced signal, the first current signal, and the second current signal) can be converted into a square wave signal (the first identification voltage or the second identification voltage) through a feedback resistor, a capacitor, and a transimpedance amplifier D1. Specifically, the current signal (one of the induced signal, the first current signal, and the second current signal) is applied to the feedback resistor. The transimpedance amplifier D1 identifies the voltage across the feedback resistor and compares it with the reference voltage VCMI to generate a square wave signal (the first identification voltage or the second identification voltage). The square wave signal (the first identification voltage or the second identification voltage) output by the transimpedance amplifier D1 can be converted into a digital signal (the first identification signal or the second identification signal) through an analog-to-digital converter 10131.

[0087] In this embodiment, the current signal can be amplified by the transimpedance amplifier D1, and the induced signal can be converted into a first identification voltage, or the first current signal or the second current signal can be converted into a second identification voltage. The identification voltage (first identification voltage or second identification voltage) can be converted into a digital signal (first identification signal or second identification signal) by the analog-to-digital converter 10131. Thus, the current signal can be converted into the first identification signal or the second identification signal, so that the processing unit can identify the touch command according to the first identification signal, thereby realizing touch recognition, or perform contact detection according to the second identification signal.

[0088] Figure 13 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 13, the current conversion unit 1013 further includes: a low-pass filter 10132. The first input terminal of the low-pass filter 10132 is connected to the negative output terminal of the transimpedance amplifier D1, the second input terminal of the low-pass filter 10132 is connected to the positive output terminal of the transimpedance amplifier D1, the first output terminal of the low-pass filter 10132 is connected to the first input terminal of the analog-to-digital converter 10131, and the second output terminal of the low-pass filter 10132 is connected to the second input terminal of the analog-to-digital converter 10131. The low-pass filter 10132 can perform low-pass filtering on the first identification voltage or the second identification voltage to reduce external signal interference in the first identification voltage or the second identification voltage.

[0089] In this embodiment, the current conversion unit 1013 further includes a low-pass filter 10132, which can perform low-pass filtering on the first identification voltage or the second identification voltage to reduce external signal interference in the first identification voltage or the second identification voltage, such as filtering out out-of-band signal interference or signal noise. At the same time, it can also prevent the Nyquist aliasing effect, improve the signal-to-noise ratio of the first identification voltage or the second identification voltage input to the analog-to-digital converter 10131, and make the identification signal corresponding to external signal interference in the first identification signal or the second identification signal converted by the analog-to-digital converter 10131 less, thereby reducing the impact of external signal interference on touch recognition or contact detection and improving the accuracy of touch recognition or contact detection.

[0090] Figure 14 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 14, the current conversion unit 1013 further includes a sample-and-hold module 10133. The sample-and-hold module 10133 includes a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a third capacitor C3, and a fourth capacitor C4. The first end of the third switch K3 is connected to the first output end of the low-pass filter 10132. The second end of the third switch K3 is connected to both the first end of the third capacitor C3 and the first end of the fourth switch K4. The second end of the fourth switch K4 is connected to the first input end of the analog-to-digital converter 10131. The second end of the third capacitor C3 is grounded. The first end of the fifth switch K5 is connected to the second output end of the low-pass filter 10132. The second end of the fifth switch K5 is connected to both the first end of the fourth capacitor C4 and the first end of the sixth switch K6. The second end of the sixth switch K6 is connected to the second input end of the analog-to-digital converter 10131. The second end of the fourth capacitor C4 is grounded. The sample-and-hold module 10133 can hold either the first identification voltage or the second identification voltage.

[0091] Since the induced signal, the first current signal, or the second current signal are changing signals, the first identification voltage or the second identification voltage output by the transimpedance amplifier D1, i.e., the square wave signal, is also a changing square wave signal. To ensure that all signals input to the analog-to-digital converter 10131 are converted into identification signals, a sample-and-hold circuit is provided. This circuit can temporarily store the subsequent first identification voltage or second identification voltage during the digital-to-analog conversion by the analog-to-digital converter 10131, preventing the analog-to-digital converter 10131 from missing a portion of the first identification voltage or second identification voltage due to changes in the first identification voltage or second identification voltage. Specifically, it can... When the analog-to-digital converter 10131 performs digital-to-analog conversion, the fourth switch K4 and / or the sixth switch K6 are turned off, and the first identification voltage or the second identification voltage is temporarily stored through the third capacitor C3 and the fourth capacitor C4. When the analog-to-digital converter 10131 is idle, the third switch K3 and / or the fifth switch K5 are turned off, and the fourth switch K4 and / or the sixth switch K6 are turned on, so that the analog-to-digital converter 10131 receives the first identification voltage or the second identification voltage temporarily stored in the capacitor. The sampling and holding effect is achieved through the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the third capacitor C3, and the fourth capacitor C4.

[0092] In this embodiment, the current conversion unit 1013 further includes a sample-and-hold module 10133. The sample-and-hold module 10133 can sample and hold the first identification voltage or the second identification voltage output by the transimpedance amplifier D1 through the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the third capacitor C3, and the fourth capacitor C4. This can prevent the first identification voltage or the second identification voltage from changing due to signal changes, thus avoiding the analog-to-digital converter 10131 from missing part of the first identification voltage or the second identification voltage. This ensures that the analog-to-digital converter 10131 converts all identification voltages into identification signals, improving the accuracy of touch recognition or contact detection.

[0093] Figure 15 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 15, the current conversion unit 1013 further includes: a buffer amplifier 10134. The first input terminal of the buffer amplifier 10134 is connected to the second terminal of the fourth switch K4, the second input terminal of the buffer amplifier 10134 is connected to the second terminal of the sixth switch K6, the first output terminal of the buffer amplifier 10134 is connected to the first input terminal of the analog-to-digital converter 10131, and the second output terminal of the buffer amplifier 10134 is connected to the second input terminal of the analog-to-digital converter 10131. The buffer amplifier 10134 can perform signal amplification processing on the first identification voltage or the second identification voltage.

[0094] In this embodiment, the current conversion unit 1013 further includes a buffer amplifier 10134. The buffer amplifier 10134 can amplify the first identification voltage or the second identification voltage. The buffer amplifier 10134 can be a level converter or a buffer, etc. Specifically, it can raise the high level and lower the low level of the first identification voltage or the second identification voltage to amplify the signal amplitude. This can make the signal amplitude of the first identification voltage or the second identification voltage input to the analog-to-digital converter 10131 larger, avoiding the inability of the analog-to-digital converter 10131 to convert the first identification signal or the second identification signal due to the first identification voltage or the second identification voltage being too small, which would result in the inability to recognize the touch or to perform contact detection, thus improving the accuracy of touch recognition.

[0095] In one possible implementation, the touch chip further includes a demodulation circuit that can demodulate the first identification signal to obtain a first demodulated signal and send the first demodulated signal to the processing unit of the electronic device so that the processing unit can perform touch position identification based on the first demodulated signal, or demodulate the second identification signal to obtain a second demodulated signal and send the second demodulated signal to the processing unit of the electronic device so that the processing unit can perform steering wheel contact detection based on the second demodulated signal.

[0096] The demodulation circuit can demodulate the first or second identification signal sent by the analog-to-digital converter. Specifically, it can demodulate the first or second identification signal to determine its signal amplitude, and generate a first or second demodulated signal based on the signal amplitude. In one example, the demodulation circuit 103 can perform narrowband demodulation on the first or second identification signal to reduce the bandwidth of noise, thereby improving the signal-to-noise ratio of the first or second identification signal. After generating the first or second demodulated signal, the demodulation circuit 103 sends it to the processing unit in the touch chip 102. The processing unit can perform touch position recognition based on the first demodulated signal or touch detection based on the second demodulated signal. In one example, the demodulation circuit can be a digital demodulation circuit; in another example, it can be an analog demodulation circuit.

[0097] In this embodiment, the touch chip includes a demodulation circuit. The demodulation circuit can demodulate the first identification signal or the second identification signal to obtain the first demodulated signal or the second demodulated signal. Thus, touch position recognition can be performed based on the first demodulated signal or contact detection can be performed based on the second demodulated signal. Since the demodulation circuit is provided, the noise in the first identification signal or the second identification signal can be reduced, so that the first demodulated signal and the second demodulated signal have a higher signal-to-noise ratio, which can improve the accuracy of touch position recognition or contact detection.

[0098] Figure 16 is a schematic diagram of a demodulation circuit provided in an embodiment of this application. As shown in Figure 16, the demodulation circuit 104 includes a first demodulation branch 1041 and a second demodulation branch 1042. The first demodulation branch 1041 is used to perform sinusoidal demodulation on the first identification signal to obtain a first demodulation sub-signal. The second demodulation branch 1042 is used to perform cosine demodulation on the first identification signal to obtain a second demodulation sub-signal. Alternatively, the first demodulation branch 1041 is used to perform sinusoidal demodulation on the second identification signal to obtain a third demodulation sub-signal. The second demodulation branch 1042 is used to perform cosine demodulation on the second identification signal to obtain a fourth demodulation sub-signal. The demodulation circuit 104 is used to generate a first demodulation signal based on the first and second demodulation sub-signals. Alternatively, the demodulation circuit 104 is used to generate a second demodulation signal based on the third and fourth demodulation sub-signals.

[0099] The demodulation circuit 104 can be a logic circuit. The demodulation circuit 104 includes two branches. The first demodulation branch 1041 can perform sinusoidal demodulation on the first identification signal or the second identification signal to obtain the I component (first demodulation sub-signal or third demodulation sub-signal) of the first identification signal or the second identification signal. The second demodulation branch 1042 can perform cosine demodulation on the first identification signal or the second identification signal to obtain the Q component (second demodulation sub-signal or fourth demodulation sub-signal) of the first identification signal or the second identification signal. The root mean square of the squares of the I component and the Q component can be used to calculate the signal amplitude of the first demodulated signal or the second demodulated signal.

[0100] The demodulation principle will be explained below. For ease of explanation, the first identification signal or the second identification signal will be referred to as the identification signal, and the first demodulation signal or the second demodulation signal will be referred to as the demodulation signal.

[0101] In one example, Figure 17 is a schematic diagram of an IQ demodulation principle provided by an embodiment of this application. As shown in Figure 17, the I component of the identified signal is equal to... The Q component of the identified signal is equal to: Find the roots of I3 and Q3, then A is the signal amplitude of the identified signal, β is the phase information of the identified signal, β=arctan(I2 / Q2), and T is the driving time of the driving signal. The demodulation circuit 104 adopts IQ narrowband demodulation. Taking a coding time of 100ms as an example, the noise band width is ±10Hz. In one example, a digital window function operation, such as a Hamming window or a Hanning window, can be added between the analog-to-digital converter 102021 and the demodulation circuit 104 to avoid signal loss caused by truncation effect. Figure 18 is a schematic diagram of the frequency response curve of IQ demodulation bandwidth provided by an embodiment of this application. As shown in Figure 18, the sidelobe width of this scheme is 1 / T, and the main lobe width is 2 / T.

[0102] The principle of contact detection based on the second demodulated signal in the embodiments of this application will be explained below.

[0103] For the circuit in Figure 8, in the detection loop formed by the touch chip 101 and the touch module 102, the voltage U(t) of the second identification signal is U amp *sin2πft, the current (first current signal or second current signal) is I(t)=I amp *sin(2πft-θ), IQ demodulation of the current yields the I component of the current as I(t)*cos2πft=I amp *sin(2πft-θ)*cos2πft=0.5I amp [sin(4πft-θ)-sinθ], after accumulating or filtering the I component of the current, we obtain the I component I = -0.5I. amp [sinθ], where θ is the phase information of the current signal, and the Q component of the current is I(t)*sin2πft=I amp *sin(2πft-θ)*sin2πft=0.5I amp [cos(4πft-θ)-cosθ], after accumulating or filtering the I component of the current, the Q component Q = 0.5I is obtained. amp cosθ.

[0104] Then we can know from the I component and the Q component. θ = arctan(-I / Q) can be used to calculate the human body impedance. The resistive impedance of the human body is human capacitive impedance This enables the detection of the capacitive impedance C and resistive impedance R of the human body.

[0105] In this embodiment, the demodulation circuit 104 includes a first demodulation branch 1041 and a second demodulation branch 1042, which can perform IQ demodulation on the first identification signal or the second identification signal. Since IQ demodulation is used on the first identification signal or the second identification signal, the noise of the touch chip in touch position detection or contact detection can be reduced. Furthermore, since the bandwidth of IQ narrowband demodulation is extremely narrow, the in-band noise of the generated first demodulated signal or the second demodulated signal can be reduced, the signal-to-noise ratio of the first demodulated signal or the second demodulated signal can be improved, and the accuracy of touch position recognition or contact detection can be improved.

[0106] This application embodiment also provides a touch chip, which is used to output a first driving signal to a touch module. The touch module receives the first driving signal and forms a closed loop with the touch module, the finger, the human body and the electrodes on the touch screen when the finger touches the screen. The touch module non-contactly couples the first driving signal to the human body, so that the first driving signal is transmitted to the closed loop through the human body and the finger in sequence. The sensing signal generated in the closed loop is used for touch position recognition.

[0107] In this embodiment, the touch chip 101 can be any of the touch chips 101 in the above embodiments, and can perform the operations in any of the above embodiments, which will not be described again here.

[0108] Figure 19 is a schematic diagram of a display screen module provided in an embodiment of this application. As shown in Figure 19, the display screen module 400 includes an electrode 401 and a touch device 100 in any of the above embodiments. When a finger touches the screen, the electrode 401 forms a closed loop with the touch module, the human body and the finger. The electrode 401 includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0109] Figure 20 is a schematic diagram of an electronic device provided in an embodiment of this application. As shown in Figure 20, the electronic device 200 includes a processor 201 and a display screen module 400 in the above embodiment. The processor 201 is electrically connected to the display screen module 400. The processor 201 is used to send a switching signal to the touch device 100, so that the touch chip 101 in the touch device 100 outputs a first driving signal to the touch module 102 or outputs a second driving signal to the electrode 401.

[0110] In one example, Figure 21 is a schematic diagram of the switching principle of an electronic device provided in an embodiment of this application. As shown in Figure 21, when the electronic device is in the floating touch mode, the touch position can be identified by the touch device. When the electronic device is in the non-floating touch mode, the touch position can be detected by the electrodes in the screen module. In one example, the electronic device can switch between the floating touch mode and the non-floating touch mode by sending a switching signal to the touch chip in the touch device through the processor.

[0111] In this embodiment, the processor 201 can send a switching signal to the touch device 100, causing the touch chip 101 in the touch device 100 to output a first driving signal to the touch module 102 or a second driving signal to the electrode 401. This allows switching between everyday use scenarios and hover touch use scenarios. Since the switching between the regular touch mode and the hover touch mode is based on the switching signal, it is applicable to touch position recognition in both everyday and hover touch scenarios. It is applicable to touch position recognition in various use scenarios and has high applicability.

[0112] This application also provides a touch control device for automobiles, comprising: a touch chip and a touch module. The touch module includes metal electrodes disposed on the car seat and / or metal wires disposed in the car steering wheel. The touch chip is used to output a first driving signal to the touch module. The touch module is used to receive the first driving signal and, when a finger touches the screen, to non-contactly couple the first driving signal to the human body, so as to transmit the first driving signal to the finger through the human body, so that the finger senses the electrodes on the touch screen to form a sensing signal. The touch chip identifies the touch position based on the sensing signal.

[0113] Specifically, during hover touch, the human body is insulated from the touch module. For example, in Figure 5(a), a human sits on the car seat, and the human body is in contact with the car seat, meaning the human body is insulated from the metal electrodes in the car seat. In Figure 5(b), a hand is placed on the car steering wheel, meaning the human body is insulated from the metal wires in the car steering wheel. In one example, Figure 6 is a schematic diagram of an equivalent circuit provided in an embodiment of this application. As shown in Figure 6, when the finger 301 touches, there is an equivalent capacitance between the touch module 102 and the human body 300. The touch module 102, the human body 300, the finger 301, and the electrode 401 form a closed loop. The electrode 401 can be a lateral electrode. And / or vertical electrodes, in Figure 6, the equivalent signal source L1 is the first driving signal received by the touch module 102, the capacitor CHM is the equivalent capacitance between the touch module 102 and the human body 300, the capacitor CHT is the equivalent capacitance between the finger 301 and the electrode 401, and the resistor Rm is the equivalent resistance of the human body. The touch module 102 non-contactly couples the first driving signal to the human body 300, and the human body transmits the first driving signal to the finger 301. The finger 301 and the electrode 401 are mutually capacitive, which causes the signal in the closed loop to change, that is, to generate a sensing signal. The electrode 401 sends the sensing signal to the touch chip 101 through the pins of the touch chip 101. The touch chip 101 performs touch position recognition according to the sensing signal.

[0114] In this embodiment, the touch chip outputs a first driving signal to the touch module. The touch module receives the first driving signal. When a finger touches the screen, the touch module non-contactly couples the first driving signal to the human body, allowing the first driving signal to be transmitted through the human body to the finger. This causes the finger to sense the electrodes on the touch screen, generating a sensing signal on the electrodes. Thus, the touch chip can identify the touch position based on the sensing signal. Since the first driving signal is directly coupled to the human body, and then transmitted from the human body to the finger and then to the electrodes, generating a sensing signal on the electrodes, compared with the prior art of touch position identification through electrode self-capacitance or mutual capacitance, this touch device can receive the first driving signal through equivalent capacitance when the finger is far away. Therefore, this touch device is suitable for hover gesture touch and can realize touch operation when the finger does not touch the touch screen.

[0115] In one possible implementation, when the touch module includes a metal wire disposed in the car steering wheel, the touch chip is used to output a third driving signal. The touch module receives the third driving signal and generates a first current signal. After the human body at least partially contacts the car steering wheel, the touch module couples the third driving signal to the human body and generates a second current signal. The touch chip performs car steering wheel contact detection based on the first current signal or the second current signal.

[0116] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the method embodiments, since they are basically similar to the methods described in the apparatus and system embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions of other embodiments.

[0117] It should be understood that the foregoing describes specific embodiments of this specification. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0118] It should be understood that the use of a singular form to describe an element or to show only one element in the accompanying drawings does not imply that the number of such element is limited to one. Furthermore, modules or elements described or shown as separate herein may be combined into a single module or element, and modules or elements described or shown as single herein may be broken down into multiple modules or elements.

[0119] It should also be understood that the terminology and expressions used herein are for descriptive purposes only, and one or more embodiments described herein should not be limited to these terms and expressions. The use of these terms and expressions does not exclude any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

Claims

1. A touch device, comprising: include: Touch chips and touch modules; The touch chip is used to output a first driving signal to the touch module; The touch module is used to receive the first driving signal. When the finger touches the screen, the touch module, the finger, the human body, and the electrodes on the touch screen form a closed loop. The touch module non-contactly couples the first driving signal to the human body, so that the first driving signal is transmitted sequentially through the human body and the finger to the closed loop to generate a sensing signal in the closed loop. The touch chip identifies the touch position based on the sensing signal. 2.The touch device of claim 1, wherein, When the touch chip receives a switching signal from the processor in the electronic device, the touch chip stops outputting the first driving signal to the touch module, and sends a second driving signal to the electrode, and performs position recognition based on the touch signal output by the electrode, wherein the electrode includes multiple horizontal electrodes and / or multiple vertical electrodes.

3. The touch device according to claim 2, characterized in that, When the electronic device is in hover touch mode, the touch chip outputs the first driving signal to the touch module. When the electronic device is in non-hover touch mode, the touch chip sends the second driving signal to the electrode. 4.The touch device of claim 2, wherein, The touch chip sends the second driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and performs position recognition based on the touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes. 5.The touch device of claim 2, wherein, At least one of the plurality of horizontal electrodes and the plurality of vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip sends the second driving signal to the driving electrode and performs position recognition based on the touch signal output by the receiving electrode. 6.The touch device of claim 2, wherein, The touch chip includes: a first switch and a second switch; The first switch is electrically connected to the first pin, one end of the second switch is electrically connected to the first pin, and the other end of the second switch is grounded. When the first switch is closed and the second switch is open, the touch chip outputs the first drive signal to the touch module through the first pin; When the first switch is open and the second switch is closed, the touch chip stops outputting the first driving signal to the touch module and sends the second driving signal to the electrode. 7.The touch device according to claim 6, characterized in that, The touch device also includes a signal amplification module; The input terminal of the signal amplification module is connected to the first pin, and the output terminal of the signal amplification module is connected to the touch module. The signal amplification module is used to amplify the level of the first driving signal and send the amplified first driving signal to the touch module. When the finger touches the screen, the touch module non-contactly couples the amplified first driving signal to the human body, so that the amplified first driving signal is transmitted to the closed loop sequentially through the human body and the finger. 8.The touch device according to any one of claims 1-7, characterized in that, The touch module includes metal electrodes disposed on the car seat and / or metal wires disposed in the car steering wheel. 9.The touch device of claim 8, wherein, The metal wire installed in the car steering wheel is used to heat the car steering wheel. 10.The touch device of claim 8, wherein, When the touch module includes a metal wire disposed in the car steering wheel, the touch chip is used to output a third driving signal. The touch module receives the third driving signal and generates a first current signal. After the human body at least partially contacts the car steering wheel, the touch module non-contactly couples the third driving signal to the human body and generates a second current signal. The touch chip performs car steering wheel contact detection based on the first current signal or the second current signal.

11. The touch device according to claim 10, characterized in that, The touch chip includes a current conversion unit and a processing unit; The current conversion unit is used to generate a first identification signal based on the sensing signal, or to generate a second identification signal based on the first current signal or the second current signal; The processing unit is configured to perform touch location identification based on the first identification signal, or based on the second identification signal. Conduct a contact test on the car steering wheel.

12. The touch control device according to claim 11, wherein, The current conversion unit includes a transimpedance amplifier, a first resistor, a second resistor, a first feedback resistor, a second feedback resistor, a first capacitor, a second capacitor, and an analog-to-digital converter; The first end of the first resistor serves as the input terminal of the current conversion unit, the second end of the first resistor is connected to the positive input terminal of the transimpedance amplifier, the first end of the second resistor is connected to the reference voltage, the second end of the second resistor is connected to the negative input terminal of the transimpedance amplifier, the negative output terminal of the transimpedance amplifier is connected to the first input terminal of the analog-to-digital converter, and the positive output terminal of the transimpedance amplifier is connected to the second input terminal of the analog-to-digital converter. The first end of the first feedback resistor is connected to the positive input terminal of the transimpedance amplifier, the second end of the first feedback resistor is connected to the negative output terminal of the transimpedance amplifier, the first end of the second feedback resistor is connected to the negative input terminal of the transimpedance amplifier, and the second end of the first feedback resistor is connected to the positive output terminal of the transimpedance amplifier. The first terminal of the first capacitor is connected to the first terminal of the first feedback resistor, the second terminal of the first capacitor is connected to the second terminal of the first feedback resistor, the first terminal of the second capacitor is connected to the first terminal of the second feedback resistor, and the second terminal of the second capacitor is connected to the second terminal of the second feedback resistor. The transimpedance amplifier is used to convert the induced signal into a first identification voltage, or to convert the first current signal or the second current signal into a second identification voltage. The analog-to-digital converter is used to receive the first identification voltage and convert the first identification voltage into the first identification signal, or to receive the second identification voltage and convert the second identification voltage into the second identification signal.

13. The touch control device according to claim 12, wherein, The current conversion unit further includes: a low-pass filter; The first input terminal of the low-pass filter is connected to the negative output terminal of the transimpedance amplifier, the second input terminal of the low-pass filter is connected to the positive output terminal of the transimpedance amplifier, the first output terminal of the low-pass filter is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the low-pass filter is connected to the second input terminal of the analog-to-digital converter. The low-pass filter is used to perform low-pass filtering on the first identification voltage or the second identification voltage to reduce external signal interference in the first identification voltage or the second identification voltage.

14. The touch control device according to claim 13, wherein, The current conversion unit further includes a sample-and-hold module; the sample-and-hold module includes a third switch, a fourth switch, a fifth switch, a sixth switch, a third capacitor, and a fourth capacitor; the first terminal of the third switch is connected to the first output terminal of the low-pass filter, the second terminal of the third switch is connected to both the first terminal of the third capacitor and the first terminal of the fourth switch, the second terminal of the fourth switch is connected to the first input terminal of the analog-to-digital converter, and the second terminal of the third capacitor is grounded; the first terminal of the fifth switch is connected to the second output terminal of the low-pass filter, the second terminal of the fifth switch is connected to both the first terminal of the fourth capacitor and the first terminal of the sixth switch, the second terminal of the sixth switch is connected to the second input terminal of the analog-to-digital converter, and the second terminal of the fourth capacitor is grounded; the sample-and-hold module is used to hold the first identification voltage or the second identification voltage.

15. The touch control device according to claim 14, wherein, The current conversion unit further includes: a buffer amplifier; the first input terminal of the buffer amplifier is connected to the second terminal of the fourth switch, the second input terminal of the buffer amplifier is connected to the second terminal of the sixth switch, the first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is used to amplify the signal of the first identification voltage or the second identification voltage. 16.The touch device according to any one of claims 11-15, wherein, The touch chip also includes a demodulation circuit; The demodulation circuit is used to demodulate the first identification signal to obtain a first demodulated signal, and send the first demodulated signal to the processing unit of the electronic device so that the processing unit can perform touch position identification based on the first demodulated signal, or to demodulate the second identification signal to obtain a second demodulated signal, and send the second demodulated signal to the processing unit of the electronic device so that the processing unit can perform steering wheel contact detection based on the second demodulated signal.

17. The touch control device according to claim 16, wherein, The demodulation circuit includes a first demodulation branch and a second demodulation branch; The first demodulation branch is used to perform sinusoidal demodulation on the first identification signal to obtain a first demodulated sub-signal; the second demodulation branch is used to perform cosine demodulation on the first identification signal to obtain a second demodulated sub-signal; or, the first demodulation branch is used to perform sinusoidal demodulation on the second identification signal to obtain a third demodulated sub-signal; and the second demodulation branch is used to perform cosine demodulation on the second identification signal to obtain a fourth demodulated sub-signal. The demodulation circuit is used to generate the first demodulated signal based on the first demodulated sub-signal and the second demodulated sub-signal. Alternatively, the demodulation circuit is configured to generate the second demodulated signal based on the third demodulation sub-signal and the fourth demodulation sub-signal.

18. A touch chip, comprising: The touch chip is used to output a first driving signal to the touch module. When the touch module receives the first driving signal and the touch module, the finger, the human body, and the electrodes on the touch screen form a closed loop, the touch module non-contactly couples the first driving signal to the human body, so that the first driving signal is transmitted sequentially through the human body and the finger to the closed loop. The sensing signal generated in the closed loop is used for touch position recognition.

19. The touch chip according to claim 18, characterized in that, When the touch chip receives a switching signal from the processor in the electronic device, the touch chip stops outputting the first driving signal to the touch module, and sends a second driving signal to the electrode, and performs position recognition based on the touch signal output by the electrode, wherein the electrode includes multiple horizontal electrodes and / or multiple vertical electrodes.

20. The touch chip of claim 19, wherein, When the electronic device is in hover touch mode, the touch chip outputs the first driving signal to the touch module. When the electronic device is in non-hover touch mode, the touch chip sends the second driving signal to the electrode.

21. The touch chip of claim 19, wherein, The touch chip sends the second driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and performs position recognition based on the touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes.

22. The touch chip of claim 19, wherein, At least one of the plurality of horizontal electrodes and the plurality of vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip sends the second driving signal to the driving electrode and performs position recognition based on the touch signal output by the receiving electrode.

23. The touch chip of claim 19, wherein, The touch chip includes: a first switch and a second switch; The first switch is electrically connected to the first pin, one end of the second switch is electrically connected to the first pin, and the other end of the second switch is grounded. When the first switch is closed and the second switch is open, the touch chip outputs the first drive signal to the touch module through the first pin; When the first switch is open and the second switch is closed, the touch chip stops outputting the first driving signal to the touch module and sends the second driving signal to the electrode.

24. The touch chip of any of claims 18-23, wherein, The touch module includes metal electrodes disposed on the car seat and / or metal wires disposed in the car steering wheel.

25. The touch chip of claim 24, wherein, The metal wire installed in the car steering wheel is used to heat the car steering wheel.

26. The touch chip of claim 24, wherein, When the touch module includes a metal wire disposed in the car steering wheel, the touch chip is used to output a third driving signal. The touch module receives the third driving signal and generates a first current signal. After the human body at least partially contacts the car steering wheel, the touch module non-contactly couples the third driving signal to the human body and generates a second current signal. The touch chip performs car steering wheel contact detection based on the first current signal or the second current signal.

27. The touch chip of claim 26, wherein, The touch chip includes a current conversion unit and a processing unit; The current conversion unit is used to generate a first identification signal based on the sensing signal, or to generate a second identification signal based on the first current signal or the second current signal; The processing unit is used to identify the touch position based on the first identification signal, or to detect contact with the car steering wheel based on the second identification signal.

28. The touch chip of claim 27, wherein, The current conversion unit includes a transimpedance amplifier, a first resistor, a second resistor, a first feedback resistor, a second feedback resistor, a first capacitor, a second capacitor, and an analog-to-digital converter; The first end of the first resistor serves as the input terminal of the current conversion unit, the second end of the first resistor is connected to the positive input terminal of the transimpedance amplifier, the first end of the second resistor is connected to the reference voltage, the second end of the second resistor is connected to the negative input terminal of the transimpedance amplifier, the negative output terminal of the transimpedance amplifier is connected to the first input terminal of the analog-to-digital converter, and the positive output terminal of the transimpedance amplifier is connected to the second input terminal of the analog-to-digital converter. The first terminal of the first feedback resistor is connected to the positive input terminal of the transimpedance amplifier, and the second terminal of the first feedback resistor... The first feedback resistor is connected to the negative output terminal of the transimpedance amplifier. The second feedback resistor is connected to the negative input terminal of the transimpedance amplifier. The second feedback resistor is connected to the positive output terminal of the transimpedance amplifier. The first terminal of the first capacitor is connected to the first terminal of the first feedback resistor, the second terminal of the first capacitor is connected to the second terminal of the first feedback resistor, the first terminal of the second capacitor is connected to the first terminal of the second feedback resistor, and the second terminal of the second capacitor is connected to the second terminal of the second feedback resistor. The transimpedance amplifier is used to convert the induced signal into a first identification voltage, or to convert the first current signal or the second current signal into a second identification voltage. The analog-to-digital converter is used to receive the first identification voltage and convert the first identification voltage into the first identification signal, or to receive the second identification voltage and convert the second identification voltage into the second identification signal.

29. The touch chip of claim 28, wherein, The current conversion unit further includes: a low-pass filter; The first input terminal of the low-pass filter is connected to the negative output terminal of the transimpedance amplifier, the second input terminal of the low-pass filter is connected to the positive output terminal of the transimpedance amplifier, the first output terminal of the low-pass filter is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the low-pass filter is connected to the second input terminal of the analog-to-digital converter. The low-pass filter is used to perform low-pass filtering on the first identification voltage or the second identification voltage to reduce external signal interference in the first identification voltage or the second identification voltage.

30. The touch chip of claim 29, wherein, The current conversion unit further includes a sample-and-hold module; the sample-and-hold module includes a third switch, a fourth switch, a fifth switch, a sixth switch, a third capacitor, and a fourth capacitor; the first terminal of the third switch is connected to the first output terminal of the low-pass filter, the second terminal of the third switch is connected to both the first terminal of the third capacitor and the first terminal of the fourth switch, the second terminal of the fourth switch is connected to the first input terminal of the analog-to-digital converter, and the second terminal of the third capacitor is grounded; the first terminal of the fifth switch is connected to the second output terminal of the low-pass filter, the second terminal of the fifth switch is connected to both the first terminal of the fourth capacitor and the first terminal of the sixth switch, the second terminal of the sixth switch is connected to the second input terminal of the analog-to-digital converter, and the second terminal of the fourth capacitor is grounded; the sample-and-hold module is used to hold the first identification voltage or the second identification voltage.

31. The touch chip of claim 30, wherein, The current conversion unit further includes: a buffer amplifier; the first input terminal of the buffer amplifier is connected to the second terminal of the fourth switch, the second input terminal of the buffer amplifier is connected to the second terminal of the sixth switch, the first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is used to amplify the signal of the first identification voltage or the second identification voltage.

32. The touch chip of any of claims 27-31, wherein, The touch chip also includes a demodulation circuit; The demodulation circuit is used to demodulate the first identification signal to obtain a first demodulated signal, and send the first demodulated signal to the processing unit of the electronic device so that the processing unit can perform touch position identification based on the first demodulated signal, or to demodulate the second identification signal to obtain a second demodulated signal, and send the second demodulated signal to the processing unit of the electronic device so that the processing unit can perform steering wheel contact detection based on the second demodulated signal.

33. The touch chip of claim 32, wherein, The demodulation circuit includes a first demodulation branch and a second demodulation branch; The first demodulation branch is used to perform sinusoidal demodulation on the first identification signal to obtain a first demodulated sub-signal; the second demodulation branch is used to perform cosine demodulation on the first identification signal to obtain a second demodulated sub-signal; or, the first demodulation branch is used to perform sinusoidal demodulation on the second identification signal to obtain a third demodulated sub-signal; and the second demodulation branch is used to perform cosine demodulation on the second identification signal to obtain a fourth demodulated sub-signal. The demodulation circuit is configured to generate the first demodulated signal based on the first demodulation sub-signal and the second demodulation sub-signal, or the demodulation circuit is configured to generate the second demodulation signal based on the third demodulation sub-signal and the fourth demodulation sub-signal.

34. A display screen module, characterized by Includes electrodes and a touch device as described in any one of claims 1-17; When a finger touches the screen, the electrode forms a closed loop with the touch module, the human body, and the finger. The electrode includes horizontal and / or vertical electrodes arranged on the touch screen.

35. An electronic device, comprising: Includes a processor and the display screen module as described in claim 34; The processor is electrically connected to the display screen module; The processor is used to send a switching signal to the touch device so that the touch chip in the touch device outputs a first driving signal to the touch module or outputs a second driving signal to the electrode.

36. A touch device for use in an automobile, characterized in that, The touch device includes a touch chip and a touch module, wherein the touch module includes metal electrodes disposed on a car seat and / or metal wires disposed in a car steering wheel; The touch chip is used to output a first driving signal to the touch module; The touch module is used to receive the first driving signal and, when the finger touches the screen, to non-contactly couple the first driving signal to the human body so that the first driving signal is transmitted to the finger through the human body, so that the finger senses the electrodes on the touch screen so that the electrodes form a sensing signal, and the touch chip identifies the touch position based on the sensing signal.

37. The touch device according to claim 36, characterized in that, When the touch module includes a metal wire disposed in the car steering wheel, the touch chip is used to output a third driving signal. The touch module receives the third driving signal and generates a first current signal. After the human body at least partially contacts the car steering wheel, the touch module couples the third driving signal to the human body and generates a second current signal. The touch chip performs car steering wheel contact detection based on the first current signal or the second current signal.

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