Touch device, touch chip, display screen module and electronic equipment

Abstract

The embodiment of the utility model provides a touch device, a touch chip, a display screen module and electronic equipment. The touch device comprises the touch chip and a touch module, the touch control chip is used for outputting a first driving signal to the touch control module; the touch control module is used for receiving the first driving signal, when a finger performs touch control, the touch control module, the finger, a human body and an electrode on the touch control screen form a closed loop, and the touch control module couples the first driving signal to the human body in a non-contact manner, the first driving signal is transmitted to the closed loop through a human body and a finger in sequence, so that an induction signal is generated in the closed loop, and the touch chip recognizes a touch position according to the induction signal. The touch device provided by the embodiment of the utility model can be suitable for touch position identification in a floating touch scene.

Description

[0001] This application claims priority to the invention application with an application date of May 30, 2024, application number "PCT / CN2024 / 096492", and patent name "Touch device, touch chip, display screen module and electronic device", all of which are incorporated herein by reference. Technical Field

[0002] The embodiments of the present application relate 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 Art

[0003] A car's central control display is an integrated in-vehicle display device that can perform multiple functions, such as navigation, multimedia playback, and driving information display. It is typically operated via touch, allowing the driver and passengers to easily access various functions through the touchscreen.

[0004] Currently, a car's central control display screen recognizes touch commands through the self-capacitance and / or mutual capacitance of electrodes included in the display screen.

[0005] However, since the touch command is identified by electrode self-capacitance and / or mutual capacitance, the user's finger is required to touch the touch screen, and touching the car's central control display screen while driving is likely to cause driving accidents, and driving safety is low. Utility Model Content

[0006] In view of this, embodiments of the present 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.

[0007] According to a first aspect of an embodiment 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 drive signal to the touch module; the touch module is configured to receive the first drive signal, wherein when a finger touches the touch screen, 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 drive signal to the human body, so that the first drive signal is sequentially transmitted through the human body and the finger into the closed loop, thereby generating a sensing signal in the closed loop, and the touch chip identifies the touch position based on the sensing signal.

[0008] According to a second aspect of an embodiment of the present application, a touch chip is provided, which is used to output a first drive signal to a touch module, and when the touch module receives the first drive signal, the touch module, the finger, the human body and the electrodes on the touch screen form a closed loop when a finger touches the screen. The touch module non-contactly couples the first drive signal to the human body, so that the first drive signal is transmitted to the closed loop through the human body and the finger in sequence, and the induction signal generated in the closed loop is used to identify the touch position.

[0009] According to the third aspect of the embodiment of the present application, a display screen module is provided, comprising electrodes and a touch device as described in the first aspect of the embodiment of the present application; when a finger touches, the electrode forms a closed loop with the touch module, the human body and the finger, wherein the electrode includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0010] According to the fourth aspect of the embodiments of the present application, an electronic device is provided, comprising a processor and the display screen module described in the second aspect of the embodiments of the present application; 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 drive signal to the touch module or outputs a second drive signal to the electrode.

[0011] According to a fifth aspect of an embodiment of the present application, the touch device is applied to an automobile, and includes: a touch chip and a touch module, the touch module including metal electrodes arranged on a car seat and / or metal wires arranged in a car steering wheel; the touch chip is used to output a first drive signal to the touch module; the touch module is used to receive the first drive signal and, when a finger touches the screen, non-contactly couple the first drive signal to the human body, so as to transmit the first drive signal 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 according to the sensing signal.

[0012] According to the touch device provided in an embodiment of the present application, the touch chip outputs a first drive signal to the touch module, and the touch module receives the first drive signal. When a finger touches the screen, the touch module, the human body, the finger, and the electrode form a closed loop. The touch module non-contactably couples the first drive signal to the human body, so that the first drive signal is transmitted to the closed loop through the human body and the finger in sequence. A sensing signal can be generated within the closed loop, thereby allowing the touch chip to identify the touch position based on the sensing signal. Since the first drive signal is directly coupled to the human body, the human body transmits the first drive signal to the finger and then to the electrode, causing the electrode to generate a sensing signal. Therefore, compared with the prior art method of identifying the touch position through electrode self-capacitance or mutual capacitance, when the finger is far away, the electrode can receive the first drive signal through equivalent capacitance. Therefore, the touch device is suitable for floating gesture touch and can achieve touch operation when the finger is not in contact with the touch screen, thereby improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0014] Figure 1 is a schematic diagram of a touch device provided in an embodiment of the present application;

[0015] Figure 2 is a schematic diagram of a touch device in a normal mode provided by an embodiment of the present application;

[0016] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of the present application;

[0017] Figure 4 is a schematic diagram of a touch device including a signal amplification module provided in an embodiment of the present application;

[0018] Figure 5 is a schematic diagram of a touch module provided in an embodiment of the present application;

[0019] Figure 6 is a schematic diagram of an equivalent circuit diagram provided in an embodiment of the present application;

[0020] Figure 7 is a schematic diagram of a signal detection timing provided by an embodiment of the present application;

[0021] Figure 8 is a schematic diagram of a detection circuit provided in an embodiment of the present application;

[0022] Figure 9 is a schematic diagram of performing touch detection and contact detection simultaneously provided by an embodiment of the present application;

[0023] Figure 10 is a schematic diagram of contact detection provided by an embodiment of the present application;

[0024] Figure 11 is a schematic diagram of another touch chip provided in an embodiment of the present application;

[0025] Figure 12 is a circuit diagram of a current conversion unit provided in an embodiment of the present application;

[0026] Figure 13 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0027] Figure 14 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0028] Figure 15 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0029] Figure 16 is a schematic diagram of a demodulation circuit provided in an embodiment of the present application;

[0030] Figure 17 This is a schematic diagram of an IQ demodulation principle provided by an embodiment of the present application;

[0031] Figure 18 1 is a schematic diagram of an IQ demodulation bandwidth frequency response curve provided in an embodiment of the present application;

[0032] Figure 19 is a schematic diagram of a display screen module provided in an embodiment of the present application;

[0033] Figure 20 is a schematic diagram of an electronic device provided in an embodiment of the present application;

[0034] Figure 21 This is a schematic diagram of an electronic device switching principle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and in detail described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0036] As mentioned above, the car's central control display is an integrated in-vehicle display device that can perform multiple functions, such as navigation, multimedia playback, and driving information display. The car's central control display is usually operated by touch, and the various functions are realized through the touch display screen for the convenience of the driver or passengers. At present, the car's central control display recognizes touch commands through the self-capacitance and / or mutual capacitance of the electrodes included in the display. However, since the touch command is recognized by the self-capacitance and / or mutual capacitance of the electrodes, the user's finger is required to touch the touch screen, and touching the car's central control display while driving can easily cause driving accidents, and driving safety is low.

[0037] In an embodiment of the present application, a touch device is provided. A touch chip outputs a first drive signal to a touch module, which receives the first drive signal. When a finger touches the screen, the touch module, the human body, the finger, and the electrode form a closed loop. The touch module non-contactably couples the first drive signal to the human body, so that the first drive signal is transmitted to the closed loop through the human body and the finger in sequence. A sensing signal can be generated within the closed loop, thereby enabling the touch chip to identify the touch position based on the sensing signal. Since the first drive signal is directly coupled to the human body, the human body transmits the first drive signal to the finger and then to the electrode, causing the electrode to generate the sensing signal. Therefore, compared with the prior art method of identifying the touch position through electrode self-capacitance or mutual capacitance, when the finger is far away, the electrode can receive the first drive signal through equivalent capacitance. Therefore, the touch device is suitable for hovering gesture touch and can achieve touch operation when the finger is not in contact with the touch screen, thereby improving driving safety.

[0038] The touch device provided by the present application is described below through embodiments.

[0039] Figure 1 is a schematic diagram of a touch device provided in an embodiment of the present application, such as Figure 1 As shown, the touch device 100 includes a touch chip 101 and a touch module 102. The touch chip 101 can output a first drive signal to the touch module 102, and the touch module 102 can receive the first drive signal. When a finger touches the touch screen, the touch module 102, the finger, the human body, and the electrode 401 on the touch screen form a closed loop. The touch module 102 couples the first drive signal to the human body in a contactless manner, so that the first drive signal is transmitted to the closed loop through the human body and the finger in sequence to generate a sensing signal in the closed loop. The touch chip 101 identifies the touch position according to the sensing signal.

[0040] 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 drive signal to the touch module 102. In one example, the first drive signal can be a voltage signal. The first drive signal can be a sine wave waveform signal, a square wave waveform signal, a trapezoidal wave waveform signal, etc.

[0041] The touch module 102 can receive the first drive signal. When the finger touches the touch screen, the finger, the touch module 102, the human body and the electrode 401 form a closed loop. Specifically, there is an equivalent capacitance between the touch module 102 and the human body due to insulation. The human body can conduct electricity, which is equivalent to an equivalent resistance. There is an equivalent capacitance between the finger and the electrode 401. Therefore, 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 the electrode 401, and the electrode 401 form a closed loop. Since the touch module 102 receives the first drive signal, the finger, the human body, the finger and the electrode 401 form a closed loop. The first drive signal, therefore, the touch module 102 can couple the first drive signal to the human body through a non-contact manner (equivalent capacitance), so that the first drive 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 touches it through the fingers of the right hand, the touch module 102 non-contactly couples the first drive signal to the left hand through the equivalent capacitance between the touch module 102 and the left hand. The first drive signal flows through the left hand to the human body and then transmits the first drive signal to the closed loop through the fingers of the right hand, and an induction signal can be generated in the closed loop.

[0042] It should be understood that the touch chip in the embodiment of the present application does not output the first drive signal to the electrode 401, but transmits the first drive signal to the human body through non-contact coupling, and then transmits it to the finger by the human body. When the finger is not touching, there is no signal in the electrode 401, for example: there is no current signal or voltage signal. When the finger is touching, the first drive signal is transmitted to the electrode 401, and an induction signal is generated in the electrode 401, thereby enabling the touch position to be identified based on the location of the electrode 401 that generates the induction signal.

[0043] 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 larger resistors, 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 the waveform of the signal will not be changed.

[0044] 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 identification.

[0045] In the embodiment of the present application, the touch chip 101 outputs a first drive signal to the touch module 102, which receives the first drive 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 drive signal to the human body, so that the first drive signal is transmitted to the closed loop through the human body and the finger in sequence. A sensing signal is generated within the closed loop, thereby enabling the touch chip 101 to identify the touch position based on the sensing signal. Since the first drive signal is directly coupled to the human body, the human body transmits the first drive signal to the finger and then to the electrode 401, causing the electrode 401 to generate the sensing signal. Therefore, compared with the prior art method 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 drive signal through the equivalent capacitance. Therefore, the touch device 100 is suitable for hovering gesture touch, and can achieve touch operation even when the finger is not in contact with the touch screen, thereby improving driving safety.

[0046] Figure 2 is a schematic diagram of a touch device in a normal mode provided by an embodiment of the present application, such as Figure 2 As shown, when the touch chip 101 receives a switching signal from the processor in the electronic device, the touch chip 101 stops outputting the first drive signal to the touch module 102, and the touch chip 101 sends a second drive signal to the electrode 401, and performs position recognition based on the touch signal output by the electrode 401, wherein the electrode 401 includes multiple horizontal electrodes and / or multiple vertical electrodes.

[0047] When the touch chip 101 receives a switching signal from the processor, it switches from the floating touch mode to the normal touch mode. The touch chip 101 stops outputting the first drive signal, and the touch module 102 stops sensing. The touch chip 101 then outputs a second drive signal to the electrode 401. The second drive signal can be a sine wave, a square wave, a trapezoidal wave, or the like. When the electrode 401 receives the second drive signal, it generates a sensing signal, and the touch chip 101 identifies the touch position based on the sensing signal.

[0048] It should be understood that Figure 2As shown, the multiple electrodes 401 include multiple horizontal electrodes and / or multiple vertical electrodes, and the touch chip 101 is electrically connected to each electrode 401. When the multiple horizontal electrodes and / or the multiple vertical electrodes generate sensing signals, the touch chip 101 can detect the sensing signals generated in the multiple horizontal electrodes and / or the multiple vertical electrodes.

[0049] In an embodiment of the present application, when the touch chip 101 receives a switching signal, the touch chip 101 stops outputting the first drive signal and outputs the second drive signal to the electrode 401, thereby being applicable to touch position recognition in daily usage scenarios. Since the conventional touch mode and the floating touch mode are switched according to the switching signal, it is applicable to touch position recognition in daily scenarios and floating touch scenarios, and is applicable to touch position recognition in a variety of usage scenarios, with high applicability.

[0050] In a possible implementation, when the electronic device is in the hovering touch mode, the touch chip 101 outputs a first driving signal to the touch module 102 ; when the electronic device is in the non-hovering touch mode, the touch chip 101 sends a second driving signal to the electrode 401 .

[0051] When the electronic device is in the floating touch mode, the touch chip 101 outputs the first drive signal, and the touch module 102 receives the first drive signal. When the finger touches the touch screen, the finger, the touch module 102, the human body and the electrode 401 form a closed loop. Specifically, there is an equivalent capacitance between the touch module 102 and the human body due to insulation. The human body can conduct electricity, which is equivalent to an equivalent resistance. There is an equivalent capacitance between the finger and the electrode 401. Therefore, 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 the electrode 401, and the electrode 401 form a closed loop. Block 102 receives the first drive signal, so the touch module 102 can couple the first drive signal to the human body through a non-contact method (equivalent capacitance), so that the first drive 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 non-contactly couples the first drive signal to the left hand through the equivalent capacitance between the touch module 102 and the left hand. The first drive signal flows through the left hand to the human body and then transmits the first drive signal to the closed loop through the fingers of the right hand. An induction signal can be generated in the closed loop.

[0052] When the electronic device is in non-hovering touch mode, the touch chip 101 stops outputting the first drive signal. At this point, the touch module 102 cannot receive the first drive signal and stops sensing. The touch chip 101 then outputs a second drive signal to the electrode 401. The second drive signal can be a sine wave, a square wave, a trapezoidal wave, or the like. Upon receiving the second drive signal, the electrode 401 generates a sensing signal, and the touch chip 101 identifies the touch position based on the sensing signal.

[0053] In one example, the floating touch mode and the non-floating touch mode can be switched by clicking a 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 achieve switching between the floating touch mode and the non-floating touch mode.

[0054] In an embodiment of the present application, when the electronic device is in a floating touch mode, the touch chip 101 outputs a first drive signal. When the electronic device is in a non-floating touch mode, the touch module 101 sends a second drive signal to the electrode 401. Thus, the electronic device can switch between the floating touch mode and the non-floating touch mode. Therefore, the touch device can be suitable for touch position recognition in daily scenarios and floating touch scenarios, and can be suitable for touch position recognition in a variety of usage scenarios, with high applicability.

[0055] In a possible implementation, the touch chip 101 sends a second driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and performs position recognition according to a touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes.

[0056] One of the multiple horizontal electrodes and the multiple vertical electrodes serves as a driving electrode, and the touch chip 101 outputs a driving signal to the driving electrode. The other of the multiple horizontal electrodes and the multiple vertical electrodes serves as a 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.

[0057] In addition, in another possible implementation, the self-capacitance detection method can be superimposed to identify the touch position of the finger, and at least one of the multiple horizontal electrodes and the 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 a driving signal to the 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 a driving signal to the 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 a driving signal to the multiple horizontal electrodes and the multiple vertical electrodes and simultaneously receives the sensing signals output by the multiple horizontal electrodes and the multiple vertical electrodes, and the touch chip 101 identifies the touch position based on the received sensing signals.

[0058] In an embodiment of the present application, when the touch chip 101 receives a switching signal, the touch chip stops outputting the first drive signal and outputs the second drive signal to the electrode 401, thereby enabling touch position identification to be performed through the electrode 401 by adopting self-capacitance or mutual capacitance, which can be applicable to touch position identification in daily use scenarios. Since daily scenes and floating touch scenes are switched according to the switching signal, touch position identification can be applicable to daily scenes and floating touch scenes. The touch device 100 can be applicable to touch position identification in a variety of usage scenarios and has high applicability.

[0059] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of the present application, such as Figure 3 As shown, the touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is electrically connected to the 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 disconnected, the touch chip 101 outputs a first drive signal to the touch module 102 through the first pin 1011. When the first switch K1 is disconnected and the second switch K2 is closed, the touch chip 101 stops outputting the first drive signal to the touch module 102 and sends a second drive signal to the electrode 401.

[0060] The touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is arranged 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 drive signal and transmits the first drive signal to the first pin 1011 through the closed first switch K1. The first pin 1011 sends the first drive signal to the touch module 102 electrically connected to the first pin 1011, thereby enabling touch position recognition in a floating touch scenario.

[0061] 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 line, 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 electricity to the ground line, the first switch K1 will be disconnected at this time. The touch chip 101 stops outputting the first drive signal to the touch module 102 and then outputs the second drive signal to the electrode 401, so that touch position recognition can be performed in daily scenarios.

[0062] In the embodiment of the present application, 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 disconnected, the touch chip 101 outputs a first drive signal to the touch module 102. When the first switch K1 is disconnected and the second switch K2 is closed, the touch chip 101 sends a second drive signal to the electrode 401, thereby achieving switching between a floating touch recognition mode and a daily touch recognition mode. Since the touch chip 101 can control the on and off of the first switch K1 and the second switch K2 according to the switching signal sent by the processor, it can be applied to daily scenarios and floating touch scenarios for touch position recognition. The touch device 100 can be applied to touch position recognition in a variety of usage scenarios and has high applicability.

[0063] Figure 4 is a schematic diagram of a touch device including a signal amplification module provided in an embodiment of the present application. Figure 4As shown, the touch device 100 also includes: a signal amplifying module 103, the input end of the signal amplifying module 103 is connected to the first pin 1011, and the output end of the signal amplifying module 103 is connected to the touch module 102. The signal amplifying module 103 can amplify the level of the first drive signal and send the amplified first drive signal to the touch module 102. When a finger touches, the touch module 102 non-contactly couples the amplified first drive signal to the human body, so that the amplified first drive signal is transmitted to the closed loop through the human body and the finger in sequence.

[0064] The signal amplification module 103 can amplify the first drive signal output by the touch chip 101. The input end of the signal amplification module 103 receives the first drive signal output by the touch chip 101 through the first pin 1011, then amplifies the first drive signal, and sends the amplified first drive signal to the touch module 102. As a result, the touch module 102 non-contactly couples the amplified first drive signal to the human body, so that the amplified first drive signal is transmitted to the closed loop through the human body and the finger in turn. The closed loop generates a sensing signal based on the amplified first drive signal.

[0065] In one example, the difference range between the peak and the trough of the first drive signal before signal amplification is [1Vpp, 10Vpp], that is, the difference range between the high level and the low level is between 1Vpp-10Vpp, and the difference range between the peak and the trough of the first drive signal after signal amplification processing is [1Vpp, 30Vpp], that is, the difference range between the high level and the low level is between 1Vpp-30Vpp.

[0066] In the embodiment of the present application, the touch control device 100 further includes a signal amplification module 103, which can perform signal amplification processing on the first drive signal output by the touch control chip 101, thereby increasing the signal amplitude of the first drive signal. As a result, the first drive signal with a larger amplitude can be non-contactly coupled to the human body, so that the first drive signal with a larger amplitude is transmitted to the closed loop through the human body and the finger in sequence, so that the signal amplitude of the generated sensing signal is larger, thereby improving the sensitivity of the touch control device 100 in identifying the touch position.

[0067] In a possible implementation, the touch module 102 includes a metal electrode disposed on a car seat and / or a metal wire disposed in a car steering wheel.

[0068] Figure 5 is a schematic diagram of a touch module provided in an embodiment of the present application, such as Figure 5 As shown, Figure 5(a) shows that the metal electrode 1021 on the car seat is used as the touch module 102. Figure 5 (b) shows that the metal wire 1022 in the car steering wheel is used as the touch module 102.

[0069] When the touch is suspended, the human body is insulated from the touch module, for example: Figure 5 In the car seat (a), a human body can sit on the car seat, and the human body and the car seat are in contact, that is, the human body is in insulated contact with the metal electrode 1021 in the car seat. Figure 5 In the car steering wheel of (b), the hand is placed on the car steering wheel, that is, 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 diagram provided in an embodiment of the present application, such as Figure 6 As shown, when the finger 301 touches, there is an equivalent capacitance between the touch module 102 and the human body 300, and 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 horizontal electrode and / or a vertical electrode. Figure 6 The equivalent signal source L1 is the first drive signal received by the touch module 102, the capacitance CHM is the equivalent capacitance between the touch module 102 and the human body 300, the capacitance CHT is the equivalent capacitance between the finger 301 and the electrode 401, and the resistance Rm is the equivalent resistance of the human body. The touch module 102 couples the first drive signal to the human body 300 in a contactless manner, and the human body 300 transmits the first drive signal to the finger 301. The mutual capacitance between the finger 301 and the electrode 401 causes the signal in the closed loop to change, i.e., generates a sensing signal. The electrode 401 sends the sensing signal to the touch chip 101 through the pin of the touch chip 101, and the touch chip 101 identifies the touch position based on the sensing signal.

[0070] Figure 7 This is a schematic diagram of a signal detection timing provided by an embodiment of the present application, such as Figure 7 As shown, a first driving signal of duration t1 is output to the touch control module 102. Signal detection is performed on the vertical electrodes in the electrode 401 during the time period 0-t1 to determine the vertical coordinate of the touch position. A first driving signal of duration t1 is output again to the touch control module 102. Signal detection is performed on the horizontal electrodes in the electrode 401 during the time period t1 to 2*t1 to determine the horizontal coordinate of the touch position. Thus, the horizontal and vertical coordinates of the touch position can be detected within the time period 2*t1, thereby determining the touch position.

[0071] In an embodiment of the present application, the touch module 102 includes a metal electrode arranged on the car seat and / or a metal wire arranged in the car steering wheel, so that when a finger touches the car, the metal electrode arranged on the car seat and / or the metal wire arranged in the car steering wheel forms a closed loop with the human body, the finger and the electrode 401, and the touch module 102 sequentially couples the first drive signal to the human body in a non-contact manner, so that the first drive signal is transmitted to the closed loop through the human body and the finger in turn, thereby realizing floating touch of the car's central control display screen.

[0072] In a possible implementation, a metal wire disposed in a car steering wheel is used to heat the car steering wheel.

[0073] In an embodiment of the present application, the metal wire arranged in the car steering wheel can be used to heat the car steering wheel. Since car manufacturers will build-in metal wire for steering wheel heating function in the car steering wheel, the metal wire built into the car steering wheel can be reused without the need to set up additional metal wire, which is low in cost.

[0074] In one possible implementation, when the touch module 102 includes a metal wire arranged in a car steering wheel, the touch chip 101 is used to output a third drive signal, and the touch module 102 receives the third drive 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 drive signal to the human body to generate a second current signal, and the touch chip 101 performs car steering wheel contact detection based on the first current signal or the second current signal.

[0075] When the touch module 102 includes a metal wire in a car steering wheel, the touch chip 101 outputs a third drive signal to the metal wire. In one example, the third drive signal can be a drive signal with a sine wave waveform. When the human body is not in contact with the car steering wheel, the metal wire receives the third drive 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 loop. Since the metal wire receives the third drive signal, a first current signal is generated in the detection loop. After the human body at least partially contacts the car steering wheel, for example: grasping the steering wheel with one hand, grasping the steering wheel with both hands, etc., 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 couples the third drive signal to the human body in a non-contact manner. The third drive 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 loop. That is, the equivalent resistance and equivalent capacitance of the human body are added to the original detection loop. Therefore, the first current signal generated in the detection loop when the human body is not touching the car steering wheel is changed to a second current signal. In this way, the touch chip 101 can perform car steering wheel contact detection based on the first current signal or the second current signal. Specifically, the touch chip 101 can detect that the human body is not touching the car steering wheel based on the first current signal, and can detect whether the human body is touching the car steering wheel with one hand or with both hands based on the magnitude of the second current signal.

[0076] In one example, Figure 8 is a schematic diagram of a detection circuit provided in an embodiment of the present application, such as Figure 8 As shown, when the human body at least partially contacts the steering wheel of the car, in the detection circuit, there is an equivalent capacitance and an equivalent resistance between the human body and the touch module 102. 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 generating unit 10121 and a driving unit 10122. The signal generating unit 10121 may generate a signal, and the driving unit 10122 may convert the signal into a first driving signal or a third driving signal. The touch chip 101 may include a current conversion unit 1013, and the current conversion unit 1013 may convert the first current signal or the second current signal.

[0077] Optionally, Figure 9 is a schematic diagram of a method of performing touch detection and contact detection simultaneously provided by an embodiment of the present application, such as Figure 9As shown, the third drive signal can be the first drive signal. After receiving the first drive signal, the touch module 102 (the metal wire in the car steering wheel) can generate a first current signal according to the first drive 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 car steering wheel, the first drive signal is transmitted to the electrode 401, causing the electrode 401 to generate a sensing signal. The touch chip 101 can perform car steering wheel contact detection according to the first current signal or the second current signal, and can perform touch position identification according to the sensing signal, thereby performing contact detection and touch position identification simultaneously. Figure 9 The dark dashed line in the figure is the touch detection path, and the light dashed line is the contact detection path.

[0078] In one example, the capacitive impedance and the resistive impedance can be detected according to the first current signal or the second current signal, thereby determining whether the human body is in contact with the steering wheel of the car. Specifically, Figure 10 is a schematic diagram of a contact detection provided by an embodiment of the present application, such as Figure 10 As shown, the capacitive impedance Ce and resistive impedance Re can be used to determine whether a person is touching the steering wheel with one hand, with both hands, or without any contact with the steering wheel. Furthermore, it can be determined whether an object, such as a water bottle or steering wheel weight, is in contact with the steering wheel. In one example, big data can be queried based on the detected capacitive impedance Ce and resistive impedance Re to determine the contact detection result corresponding to the capacitive impedance Ce and resistive impedance Re.

[0079] In an embodiment of the present application, when the touch module 102 includes a metal wire arranged in the car steering wheel, the touch chip 101 can output a third drive signal, and the touch module 102 receives the third drive signal, generates a first current signal, and generates a second current signal after the human body at least partially contacts the car steering wheel. Therefore, the car steering wheel contact detection can be performed according to 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 and 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, and can prevent the situation in the prior art where the human body and the car steering wheel are mistakenly detected due to auxiliary items such as counterweights, thereby improving driving safety.

[0080] Figure 11 is a schematic diagram of another touch chip provided in an embodiment of the present application, such as Figure 11As shown, 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 the sensing signal, or generate a second identification signal based on the first current signal or the second current signal. The processing unit 1014 can identify the touch position based on the first identification signal, or perform car steering wheel contact detection based on the second identification signal.

[0081] In one example, the touch control chip 101 may include multiple current conversion units 1013, some of which are used to generate a first identification signal based on the sensing signal, and some of which are used to generate a second identification signal based on the first current signal or the second current signal.

[0082] In an embodiment of the present application, the touch chip 101 includes a current conversion unit 1013 and a processing unit 1014, thereby receiving a sensing signal through the current conversion unit 1013 and converting the sensing signal into a first identification signal, or receiving a first current signal or a second current signal and converting the first current signal or the second current signal into a second identification signal. The processing unit 1014 can identify the touch position according to the first identification signal, thereby realizing the identification of the touch position, or the processing unit 1014 can perform car steering wheel contact detection according to the second identification signal, thereby realizing contact detection.

[0083] Figure 12 is a circuit diagram of a current conversion unit provided in an embodiment of the present application, such as Figure 12As shown, 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, wherein the first end of the first resistor R1 serves as the input end of the current conversion unit, the second end of the first resistor R1 is connected to the positive input end of the transimpedance amplifier D1, the first end of the second resistor R2 is connected to the reference voltage VCMI, the second end of the second resistor R2 is connected to the negative input end of the transimpedance amplifier D1, the negative output end of the transimpedance amplifier D1 is connected to the first input end of the analog-to-digital converter 10131, the positive output end of the transimpedance amplifier D1 is connected to the second input end of the analog-to-digital converter 10131, the first end of the first feedback resistor Rf1 is connected to the positive input end of the transimpedance amplifier D1, and the second end of the first feedback resistor Rf1 is connected to the negative input end of the transimpedance amplifier D 1 is connected to the negative output terminal of the transimpedance amplifier D1, the first end of the second feedback resistor Rf2 is connected to the negative input terminal of the transimpedance amplifier D1, the second end of the second feedback resistor Rf2 is connected to the positive output terminal of the transimpedance amplifier D1, the first end of the first capacitor C1 is connected to the first end of the first feedback resistor Rf1, the second end of the first capacitor C1 is connected to the second end of the first feedback resistor Rf1, the first end of the second capacitor C2 is connected to the first end of the second feedback resistor Rf2, and the second end of the second capacitor C2 is connected to the second end of the second feedback resistor Rf2. The transimpedance amplifier D1 can convert the sensing signal into a first identification voltage, or convert the first current signal or the second current signal into a second identification voltage. The analog-to-digital converter 10131 can receive the first identification voltage and convert the first identification voltage into a first identification signal, or receive the second identification voltage and convert the second identification voltage into a second identification signal.

[0084] When the current conversion unit 1013 is used to receive the sensing signal and convert 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 is used to receive the first current signal or the second current signal and convert 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.

[0085] In one example, the sensing signal is a current signal. The current signal (one of the sensing signal, the first current signal, and the second current signal) can be converted into a square wave signal (a first identification voltage or a second identification voltage) through a feedback resistor, a capacitor, and a transimpedance amplifier D1. Specifically, the current signal (one of the sensing signal, the first current signal, and the second current signal) acts on the feedback resistor, and 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 (a first identification voltage or a 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 (a first identification signal or a second identification signal) through the analog-to-digital converter 10131.

[0086] In an embodiment of the present application, the current signal can be transimpedance amplified through 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) through the analog-to-digital converter 10131, thereby converting the current signal into a first identification signal or a second identification signal, so that the processing unit can identify the touch instruction according to the first identification signal, thereby realizing touch recognition, or perform contact detection according to the second identification signal.

[0087] Figure 13 is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Figure 13 As shown, the current conversion unit 1013 also includes: a low-pass filter 10132, a first input end of the low-pass filter 10132 is connected to the negative output end of the transimpedance amplifier D1, a second input end of the low-pass filter 10132 is connected to the positive output end of the transimpedance amplifier D1, a first output end of the low-pass filter 10132 is connected to the first input end of the analog-to-digital converter 10131, and a second output end of the low-pass filter 10132 is connected to the second input end 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.

[0088] In an embodiment of the present application, the current conversion unit 1013 also 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, for example: filtering out out-of-band signal interference or signal noise, and at the same time preventing the Nyquist aliasing effect, thereby improving the signal-to-noise ratio of the first identification voltage or the second identification voltage input to the analog-to-digital converter 10131, so that the first identification signal or the second identification signal converted by the analog-to-digital converter 10131 has fewer identification signals corresponding to external signal interference, thereby reducing the impact of external signal interference on touch recognition or contact detection, and improving the accuracy of touch recognition or contact detection.

[0089] Figure 14 This is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Figure 14 As shown, the current conversion unit 1013 further includes: a sampling and holding module 10133, which 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. A first end of the third switch K3 is connected to the first output end of the low-pass filter 10132, a second end of the third switch K3 is connected to the first end of the third capacitor C3 and the first end of the fourth switch K4, a second end of the fourth switch K4 is connected to the first input end of the analog-to-digital converter 10131, a second end of the third capacitor C3 is grounded, a first end of the fifth switch K5 is connected to the second output end of the low-pass filter 10132, a second end of the fifth switch K5 is connected to the first end of the fourth capacitor C4 and the first end of the sixth switch K6, a second end of the sixth switch K6 is connected to the second input end of the analog-to-digital converter 10131, and a second end of the fourth capacitor C4 is grounded. The sampling and holding module 10133 can hold the first identification voltage or the second identification voltage.

[0090] Since the sensing signal, the first current signal or the second current signal is a changing signal, the first identification voltage or the second identification voltage output by the transimpedance amplifier D1, that is, the square wave signal is a changing square wave signal. In order to ensure that all signals are input to the analog-to-digital converter 10131 and converted into identification signals, a sampling and holding circuit is provided. When the analog-to-digital converter 10131 performs digital-to-analog conversion, the subsequent first identification voltage or the second identification voltage can be temporarily stored to avoid the analog-to-digital converter 10131 missing part of the first identification voltage or the second identification voltage due to the change of the first identification voltage or the second identification voltage. Specifically, When the analog-to-digital converter 10131 performs digital-to-analog conversion, the fourth switch K4 and / or the sixth switch K6 are disconnected, 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 disconnected, and the fourth switch K4 and / or the sixth switch K6 are closed, so that the analog-to-digital converter 10131 receives the first identification voltage or the second identification voltage temporarily stored in the capacitor, and a 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.

[0091] In an embodiment of the present application, the current conversion unit 1013 also includes a sampling and holding module 10133. The sampling and holding 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 avoid the first identification voltage or the second identification voltage from changing due to changes in the signal, causing the analog-to-digital converter 10131 to miss part of the first identification voltage or the second identification voltage, and can ensure that the analog-to-digital converter 10131 converts all identification voltages into identification signals, thereby improving the accuracy of touch recognition or contact detection.

[0092] Figure 15 This is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Figure 15 As shown, the current conversion unit 1013 further includes: a buffer amplifier 10134, wherein a first input terminal of the buffer amplifier 10134 is connected to the second terminal of the fourth switch K4, a second input terminal of the buffer amplifier 10134 is connected to the second terminal of the sixth switch K6, a first output terminal of the buffer amplifier 10134 is connected to the first input terminal of the analog-to-digital converter 10131, and a 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.

[0093] In an embodiment of the present application, the current conversion unit 1013 also includes a buffer amplifier 10134. The buffer amplifier 10134 can amplify the signal of the first identification voltage or the second identification voltage. The buffer amplifier 10134 can be a level converter or a buffer, etc. Specifically, the high level of the first identification voltage or the second identification voltage can be increased and the low level can be reduced to achieve amplification of the signal amplitude, thereby making 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 to identify touch or perform contact detection due to the inability of the analog-to-digital converter 10131 to convert the first identification voltage or the second identification voltage into the first identification signal or the second identification signal due to the small first identification voltage or the second identification voltage, thereby improving the accuracy of touch recognition.

[0094] In one possible implementation, the touch chip also includes a demodulation circuit, which 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 identify the touch position according to 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 car steering wheel contact detection according to the second demodulated signal.

[0095] The demodulation circuit can demodulate the first identification signal or the second identification signal sent by the analog-to-digital converter. Specifically, the demodulation circuit can demodulate the first identification signal or the second identification signal to determine the signal amplitude of the first identification signal or the second identification signal, and generate a first demodulation signal or a second demodulation signal based on the signal amplitude of the first identification signal or the second identification signal. In one example, the demodulation circuit 103 can perform narrowband demodulation on the first identification signal or the second identification signal to reduce the noise bandwidth, thereby improving the signal-to-noise ratio of the first identification signal or the second identification signal. After generating the first demodulation signal or the second demodulation signal, the demodulation circuit 103 sends the first demodulation signal or the second demodulation signal to the processing unit in the touch control chip 102. The processing unit can perform touch position identification based on the first demodulation signal or contact detection based on the second demodulation signal. In one example, the demodulation circuit can be a digital demodulation circuit. In another example, the demodulation circuit can be an analog demodulation circuit.

[0096] In an embodiment of the present application, the touch chip includes a demodulation circuit, which can demodulate the first identification signal or the second identification signal to obtain a first demodulated signal or a second demodulated signal, thereby performing touch position identification based on the first demodulated signal or performing contact detection 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 identification or contact detection.

[0097] Figure 16 is a schematic diagram of a demodulation circuit provided in an embodiment of the present application, such as Figure 16 As shown, 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 sine demodulation on the first identification signal to obtain a first demodulation sub-signal, and 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 sine demodulation on the second identification signal to obtain a third demodulation sub-signal, and 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 demodulation sub-signal and the second demodulation sub-signal, or the demodulation circuit 104 is used to generate a second demodulation signal based on the third demodulation sub-signal and the fourth demodulation sub-signal.

[0098] The demodulation circuit 104 can be a logic circuit. The demodulation circuit 104 includes two branches. The first demodulation branch 1041 can perform sine demodulation on the first identification signal or the second identification signal to obtain the I component of the first identification signal or the second identification signal (the first demodulation sub-signal or the third demodulation sub-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 of the first identification signal or the second identification signal (the second demodulation sub-signal or the fourth demodulation sub-signal). The root mean square of the square of the I component and the square of the Q component can be calculated to obtain the signal amplitude of the first demodulation signal or the second demodulation signal.

[0099] The demodulation principle is described below. For the convenience of description, the first identification signal or the second identification signal is collectively referred to as an identification signal, and the first demodulation signal or the second demodulation signal is collectively referred to as a demodulation signal.

[0100] In one example, Figure 17 This is a schematic diagram of an IQ demodulation principle provided by an embodiment of the present application, such as Figure 17 As shown, the I component of the identification signal is equal to The Q component of the identification signal is equal to: Find the roots of I3 and Q3, then A is the signal amplitude of the identification signal, β is the phase information of the identification signal, β=arctan(I2 / Q2), T is the driving time of the driving signal, and the demodulation circuit 104 adopts IQ narrowband demodulation. Taking the coding time as 100ms as an example, the width of the noise band 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 an IQ demodulation bandwidth frequency response curve provided by an embodiment of the present application, such as Figure 18 As shown, the sidelobe width of this solution is 1 / T, and the mainlobe width is 2 / T.

[0101] The following describes the principle of performing contact detection based on the second demodulated signal in an embodiment of the present application.

[0102] against Figure 8 For the circuit in FIG, in the detection circuit 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 is performed on the current, and the I component of the current is 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 can obtain the I component I=-0.5I amp sinθ], 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 amp cosθ.

[0103] We can know from the I and Q components that θ=arctan(-I / Q), then the human body impedance can be calculated The resistive impedance of the human body is Capacitive impedance of the human body This enables the detection of the capacitive impedance C and resistive impedance R of the human body.

[0104] In the embodiment of the present application, the demodulation circuit 104 includes a first demodulation branch 1041 and a second demodulation branch 1042, thereby performing IQ demodulation on the first identification signal or the second identification signal. Since IQ demodulation is used for the first identification signal or the second identification signal, the noise of the touch position detection or contact detection performed by the touch chip can be reduced. Moreover, since the bandwidth of the IQ narrowband demodulation is extremely narrow, the in-band noise of the generated first demodulation signal or the second demodulation signal can be reduced, the signal-to-noise ratio of the first demodulation signal or the second demodulation signal can be improved, and the accuracy of touch position recognition or contact detection can be improved.

[0105] An embodiment of the present application also provides a touch chip, which is used to output a first drive signal to the touch module, and when the touch module receives the first drive signal, the touch module, the finger, the human body and the electrodes on the touch screen form a closed loop when the finger touches the screen. The touch module couples the first drive signal to the human body in a non-contact manner, so that the first drive signal is transmitted to the closed loop through the human body and the finger in turn, and the induction signal generated in the closed loop is used to identify the touch position.

[0106] In the embodiment of the present application, the touch chip 101 may be the touch chip 101 in any of the above embodiments, and may perform the operations in any of the above embodiments, which will not be described in detail here.

[0107] Figure 19 is a schematic diagram of a display screen module provided in an embodiment of the present application, such as Figure 19 As shown, the display screen module 400 includes electrodes 401 and the 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, wherein the electrode 401 includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0108] Figure 20 This is a schematic diagram of an electronic device provided in an embodiment of the present application. As shown in 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 drive signal to the touch module 102 or outputs a second drive signal to the electrode 401.

[0109] In one example, Figure 21 This is a schematic diagram of an electronic device switching principle provided by an embodiment of the present application, such as Figure 21As shown, when the electronic device is in a floating touch mode, the touch position can be identified through the touch device. When the electronic device is in a non-floating touch mode, the touch position can be detected through the electrodes in the screen module. In one example, the electronic device can send a switching signal to the touch chip in the touch device through the processor to switch between the floating touch mode and the non-floating touch mode.

[0110] In an embodiment of the present application, the processor 201 can send a switching signal to the touch device 100, so that the touch chip 101 in the touch device 100 outputs a first drive signal to the touch module 102 or outputs a second drive signal to the electrode 401, thereby switching between daily usage scenarios and floating touch usage scenarios. Since the conventional touch mode and the floating touch mode are switched according to the switching signal, it can be applicable to touch position recognition in daily scenarios and floating touch scenarios, and can be applicable to touch position recognition in a variety of usage scenarios, and has high applicability.

[0111] The present application also provides a touch device for use in an automobile, which includes: a touch chip and a touch module, the touch module including metal electrodes arranged on a car seat and / or metal wires arranged in a car steering wheel, the touch chip being used to output a first drive signal to the touch module, the touch module being used to receive the first drive signal and, when a finger touches the screen, non-contactly couple the first drive signal to the human body, so as to transmit the first drive signal 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.

[0112] Specifically, during hovering touch, the human body is insulated from the touch module, for example: Figure 5 In the car seat (a), a human body can sit on the car seat, and the human body and the car seat are in contact, that is, the human body is in insulated contact with the metal electrodes in the car seat. Figure 5 In the car steering wheel of (b), the hand is placed on the car steering wheel, that is, the human body is insulated from the metal wire in the car steering wheel. In one example, Figure 6 is a schematic diagram of an equivalent circuit diagram provided in an embodiment of the present application, such as Figure 6 As shown, when the finger 301 touches, there is an equivalent capacitance between the touch module 102 and the human body 300, and 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 horizontal electrode and / or a vertical electrode. Figure 6The equivalent signal source L1 is the first drive signal received by the touch module 102, the capacitance CHM is the equivalent capacitance between the touch module 102 and the human body 300, the capacitance CHT is the equivalent capacitance between the finger 301 and the electrode 401, and the resistance Rm is the equivalent resistance of the human body. The touch module 102 couples the first drive signal to the human body 300 in a contactless manner, and the human body transmits the first drive signal to the finger 301. The mutual capacitance between the finger 301 and the electrode 401 causes the signal in the closed loop to change, i.e., generates a sensing signal. The electrode 401 sends the sensing signal to the touch chip 101 through the pin of the touch chip 101, and the touch chip 101 identifies the touch position based on the sensing signal.

[0113] In an embodiment of the present application, the touch chip outputs a first drive signal to the touch module, and the touch module receives the first drive signal. When a finger touches the screen, the touch module non-contactly couples the first drive signal to the human body, so that the first drive signal is transmitted to the finger through the human body, causing the finger to sense the electrodes on the touch screen so that the electrodes form a sensing signal. As a result, the touch chip can identify the touch position based on the sensing signal. Since the first drive signal is directly coupled to the human body, the human body transmits the first drive signal to the finger and then to the electrode, causing the electrode to generate a sensing signal. Therefore, compared with the touch position identification through electrode self-capacitance or mutual capacitance in the prior art, the touch device can receive the first drive signal through the equivalent capacitance when the finger is far away. Therefore, the touch device can be suitable for floating gesture touch and can achieve touch operation when the finger is not in contact with the touch screen.

[0114] In one possible implementation, when the touch module includes a metal wire arranged in a car steering wheel, the touch chip is used to output a third drive signal, the touch module receives the third drive 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 drive signal to the human body to generate a second current signal, and the touch chip performs car steering wheel contact detection based on the first current signal or the second current signal.

[0115] It should be understood that the various embodiments in this specification are described in a progressive manner. References to the same or similar parts of the various embodiments will be sufficient. Each embodiment focuses on the differences from the other embodiments. In particular, the method embodiments are generally similar to the methods described in the device and system embodiments, so their description is relatively simple. For relevant details, references to the descriptions of the other embodiments will suffice.

[0116] It should be understood that the foregoing description of this specification is based on specific embodiments. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0117] It should be understood that an element described herein in the singular or shown in the drawings as only one does not limit the number of the element to one. In addition, modules or elements described or shown herein as separate may be combined into a single module or element, and modules or elements described or shown herein as single may be split into multiple modules or elements.

[0118] It should also be understood that the terms and expressions used herein are for descriptive purposes only, and the one or more embodiments of this specification should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or portions thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

Claims

1. A touch device, characterized in that: include: Touch chip and touch module; The touch control chip is configured to output a first driving signal to the touch control module; The touch module is used to receive the first drive signal. When a finger touches the touch 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 drive signal to the human body, so that the first drive signal is transmitted to the closed loop through the human body and the finger in sequence, thereby generating a sensing signal in the closed loop. The touch chip identifies the touch position based on the sensing signal.

2. The touch device according to claim 1, wherein: When the touch chip receives a switching signal from a processor in the electronic device, the touch chip stops outputting the first drive signal to the touch module, and sends a second drive 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, wherein: The touch control chip sends the second drive signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and performs position identification based on the touch signal output by the other of the multiple horizontal electrodes and the multiple vertical electrodes, or at least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a drive electrode and a receiving electrode, the touch control chip sends the second drive signal to the drive electrode, and performs position identification based on the touch signal output by the receiving electrode.

4. The touch device according to 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 control chip outputs the first driving signal to the touch control module through the first pin; When the first switch is opened and the second switch is closed, the touch control chip stops outputting the first driving signal to the touch control module and sends the second driving signal to the electrode.

5. The touch device according to claim 4, wherein: The touch control device further includes a signal amplification module; The input end of the signal amplifying module is connected to the first pin, and the output end of the signal amplifying module is connected to the touch control module; The signal amplification module is configured to perform level amplification processing on the first drive signal and transmit the amplified first drive signal to the touch control module. When the finger performs touch control, the touch control module non-contactly couples the amplified first drive signal to the human body, so that the amplified first drive signal is sequentially transmitted through the human body and the finger into the closed loop.

6. The touch control device according to any one of claims 1 to 5, characterized in that: The touch module includes metal electrodes arranged on the car seat and / or metal wires arranged in the car steering wheel.

7. The touch device according to claim 6, wherein: The metal wire arranged in the automobile steering wheel is used for heating the automobile steering wheel.

8. The touch device according to claim 6, wherein: When the touch module includes a metal wire arranged in a car steering wheel, the touch chip is used to output a third drive signal. The touch module receives the third drive signal and generates a first current signal. After a human body at least partially contacts the car steering wheel, the touch module non-contactably couples the third drive 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.

9. The touch device according to claim 8, wherein: The touch control chip includes a current conversion unit and a processing unit; The current conversion unit is configured to generate a first identification signal according to the sensing signal, or generate a second identification signal according to the first current signal or the second current signal; The processing unit is configured to perform touch position recognition based on the first recognition signal, or perform vehicle steering wheel contact detection based on the second recognition signal.

10. The touch device according to claim 9, 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 end of the current conversion unit, the second end of the first resistor is connected to the positive input end of the transimpedance amplifier, the first end of the second resistor is connected to a reference voltage, the second end of the second resistor is connected to the negative input end of the transimpedance amplifier, the negative output end of the transimpedance amplifier is connected to the first input end of the analog-to-digital converter, and the positive output end of the transimpedance amplifier is connected to the second input end 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 end of the first capacitor is connected to the first end of the first feedback resistor, the second end of the first capacitor is connected to the second end of the first feedback resistor, the first end of the second capacitor is connected to the first end of the second feedback resistor, and the second end of the second capacitor is connected to the second end of the second feedback resistor; The transimpedance amplifier is configured to convert the sensing signal into a first identification voltage, or convert the first current signal or the second current signal into a second identification voltage; The analog-to-digital converter is configured to receive the first identification voltage and convert the first identification voltage into the first identification signal, or receive the second identification voltage and convert the second identification voltage into the second identification signal.

11. The touch device according to claim 10, wherein: The current conversion unit further includes: a low-pass filter; The first input end of the low-pass filter is connected to the negative output end of the transimpedance amplifier, the second input end of the low-pass filter is connected to the positive output end of the transimpedance amplifier, the first output end of the low-pass filter is connected to the first input end of the analog-to-digital converter, and the second output end of the low-pass filter is connected to the second input end 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.

12. The touch device according to claim 11, wherein: The current conversion unit also includes: a sampling and holding module; the sampling and holding module includes a third switch, a fourth switch, a fifth switch, a sixth switch, a third capacitor and a fourth capacitor; the first end of the third switch is connected to the first output end of the low-pass filter, the second end of the third switch is connected to the first end of the third capacitor and the first end of the fourth switch, the second end of the fourth switch is connected to the first input end of the analog-to-digital converter, and the second end of the third capacitor is grounded; the first end of the fifth switch is connected to the second output end of the low-pass filter, the second end of the fifth switch is connected to the first end of the fourth capacitor and the first end of the sixth switch, the second end of the sixth switch is connected to the second input end of the analog-to-digital converter, and the second end of the fourth capacitor is grounded; the sampling and holding module is used to maintain the first identification voltage or the second identification voltage.

13. The touch device according to claim 12, wherein: The current conversion unit further includes a buffer amplifier; a first input terminal of the buffer amplifier is connected to the second terminal of the fourth switch, a second input terminal of the buffer amplifier is connected to the second terminal of the sixth switch, a first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and a second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is configured to amplify the first identification voltage or the second identification voltage.

14. The touch control device according to any one of claims 9 to 13, wherein: The touch control chip further includes a demodulation circuit; The demodulation circuit is configured to demodulate the first identification signal to obtain a first demodulated signal, and send the first demodulated signal to a processing unit of the electronic device so that the processing unit can identify a touch position 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 detect vehicle steering wheel contact based on the second demodulated signal.

15. The touch device according to claim 14, wherein: The demodulation circuit includes a first demodulation branch and a second demodulation branch; The first demodulation branch is configured to perform sine demodulation on the first identification signal to obtain a first demodulated sub-signal, and the second demodulation branch is configured to perform cosine demodulation on the first identification signal to obtain a second demodulated sub-signal, or the first demodulation branch is configured to perform sine demodulation on the second identification signal to obtain a third demodulated sub-signal, and the second demodulation branch is configured 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 demodulation signal according to the first demodulation sub-signal and the second demodulation sub-signal, or the demodulation circuit is used to generate the second demodulation signal according to the third demodulation sub-signal and the fourth demodulation sub-signal.

16. A touch chip, characterized in that: The touch control chip is used to output a first drive signal to the touch control module. When the touch control module receives the first drive signal and a finger touches the touch screen, the touch control module, the finger, the human body, and electrodes on the touch screen form a closed loop, and the touch control module non-contactly couples the first drive signal to the human body, so that the first drive signal is sequentially transmitted through the human body and the finger into the closed loop, and the touch position is identified using the induction signal generated in the closed loop.

17. A display screen module, characterized in that: comprising an electrode and a touch device as claimed in any one of claims 1 to 15; When a finger touches the screen, the electrodes, the touch module, the human body and the finger form a closed loop, wherein the electrodes include horizontal electrodes and / or vertical electrodes arranged on the touch screen.

18. An electronic device, characterized in that: comprising a processor and the display screen module according to claim 17; The processor is electrically connected to the display screen module; The processor is configured to send a switching signal to the touch control device, so that the touch control chip in the touch control device outputs a first driving signal to the touch control module or outputs a second driving signal to the electrode.

19. A touch device, used in a car, characterized in that: The touch control device includes: a touch control chip and a touch control module, wherein the touch control module includes a metal electrode arranged on the car seat and / or a metal wire arranged in the car steering wheel; The touch control chip is configured to output a first driving signal to the touch control module; The touch module is used to receive the first drive signal and, when a finger touches the screen, non-contactly couple the first drive signal to the human body, so as to transmit the first drive signal 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 according to the sensing signal.

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