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

Abstract

A touch-control apparatus, a touch-control chip, a display screen module and an electronic device. The touch-control apparatus comprises: a touch-control chip, which is used for sending a first driving signal to a touch-control unit; and the touch-control unit, which is used for receiving the first driving signal, wherein when a finger performs touch control, the touch-control unit, the finger and an electrode on a touch-control screen form a closed loop, a sensing signal is generated in the closed loop, and the touch-control chip performs touch-control position recognition on the basis of the sensing signal. The touch-control apparatus can be suitable for touch-control position recognition in underwater scenarios and has high applicability.

Description

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

[0001] This application relates to the field of electrical engineering technology, and in particular to a touch device, a touch chip, a display screen module, and an electronic device. Background Technology

[0002] With the development of technology, electronic devices have become more integrated, and more and more electronic devices support IP6X waterproof rating. There are many scenarios that require the use of electronic devices underwater, such as using mobile phones, touchpads and other electronic devices that require touch control of the display screen underwater.

[0003] Currently, the touch devices included in the display screens of electronic devices use self-capacitance and / or mutual capacitance of electrodes to recognize touch commands.

[0004] However, because the self-capacitance and / or mutual capacitance of the electrodes are sensitive to water when recognizing touch commands, they cannot recognize finger touch commands when the display screen is covered by water, making existing electronic devices unusable underwater.

[0005] Summary of the Invention

[0006] In view of this, embodiments of this application provide a touch device, a touch chip, a display screen module, and an electronic device to at least partially solve the above-mentioned problems.

[0007] According to a first aspect of the present application, a touch device is provided, comprising: a touch chip, the touch chip being configured to send a first driving signal to a touch unit; and a touch unit, the touch unit being configured to receive the first driving signal, wherein when a finger performs a touch operation, the touch unit, the finger, and electrodes on a touch screen form a closed loop, a sensing signal is generated in the closed loop, and the touch chip performs touch position recognition based on the sensing signal.

[0008] In one possible implementation, when the touch chip receives a switching signal from the processor in the electronic device, the touch chip stops sending the first driving signal to the touch unit, and the touch chip sends a second driving signal to the electrode, and performs position recognition based on the touch signal output by the electrode, wherein the electrode includes multiple horizontal electrodes and / or multiple vertical electrodes.

[0009] In one possible implementation, when the electronic device is in underwater mode, the touch chip sends a first driving signal to the touch unit, and when the electronic device is in non-underwater mode, the touch unit sends a second driving signal to the electrode.

[0010] In one possible implementation, the touch chip sends the second driving signal to one of the plurality of lateral electrodes and the plurality of vertical electrodes, and performs position recognition based on the touch signal output by the other of the plurality of lateral electrodes and the plurality of vertical electrodes.

[0011] In one possible implementation, at least one of the plurality of lateral electrodes and the plurality of vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip sends the second driving signal to the driving electrode and performs position recognition based on the touch signal output by the receiving electrode.

[0012] In one possible implementation, the touch chip includes: a first switch and a second switch; the first switch is electrically connected to the touch unit through a first pin of the touch chip, one end of the second switch is connected to the first pin, and the other end of the second switch is grounded; when the first switch is closed and the second switch is open, the touch chip sends a first driving signal to the touch unit through the first pin; when the first switch is open and the second switch is closed, the touch chip sends a second driving signal to the electrode through a plurality of second pins of the touch chip.

[0013] In one possible implementation, the touch unit includes: a flexible circuit board; the flexible circuit board is disposed on the housing of the electronic device, the flexible circuit board is electrically connected to the first pin, the flexible circuit board is used to receive the first driving signal, and when the finger touches the device, the flexible circuit board, the finger, and the electrode form the closed loop, and transmit the first driving signal in the closed loop to generate the sensing signal.

[0014] In one possible implementation, the flexible circuit board includes at least one of annular flexible circuit board and rectangular flexible circuit board.

[0015] In one possible implementation, the touch unit includes: a metal casing of the electronic device; the metal casing is electrically connected to the first pin, the metal casing of the electronic device is used to receive the first driving signal, and when the finger touches the device, the metal casing, the finger, and the electrode form the closed loop, and transmit the first driving signal in the closed loop to generate the sensing signal.

[0016] In one possible implementation, the touch device further includes: a signal amplification module; the input terminal of the signal amplification module is connected to the first pin, and the output terminal of the signal amplification module is connected to the touch unit; the signal amplification module is used to amplify the first driving signal and send the amplified first driving signal to the touch unit, so that the touch unit transmits the amplified first driving signal in the closed loop.

[0017] In one possible implementation, the touch unit includes: a level conversion unit; the input pin of the level conversion unit is electrically connected to a third pin of the touch chip, and the first output pin of the level conversion unit is electrically connected to a ground pin of the touch chip; the touch chip sends a first driving signal to the level conversion unit through the third pin, the level conversion unit generates a square wave signal according to the first driving signal, and sends the square wave signal to the touch chip through the ground pin; when the finger touches the screen, the finger forms a closed loop with the electrode and the ground pin, so that the closed loop generates the sensing signal.

[0018] In one possible implementation, the second output pin of the level conversion unit is connected to the power supply pin of the touch chip; the level conversion unit is used to transmit a power supply voltage to the touch chip through the power supply pin, and the voltage difference between the power supply voltage and the square wave signal is equal to the power supply voltage of the touch chip.

[0019] In one possible implementation, the level conversion unit includes N sub-circuits, where N is an integer greater than or equal to 2. The first sub-circuit of the N sub-circuits includes a third switch, a fourth switch, and a first capacitor. The first terminal of the third switch is connected to a power supply, and the second terminal of the third switch is connected to a second output pin. The first terminal of the first capacitor is connected to the second output pin, and the second terminal of the first capacitor is connected to both the first terminal of the fourth switch and the first output pin. The second terminal of the fourth switch is grounded. The i-th sub-circuit of the N sub-circuits includes a fifth switch, a sixth switch, a seventh switch, and a second capacitor. The first terminal of the fifth switch is connected to the power supply, and the second terminal of the fifth switch is connected to the first terminal of the sixth switch. The second terminal of the sixth switch is connected to the second terminal of the capacitor in the (i-1)-th sub-circuit. The first terminal of the second capacitor is connected to the second terminal of the fifth switch. The second terminal is connected to the first terminal of the seventh switch, and the second terminal of the seventh switch is grounded, where i is an integer greater than 1 and less than N; the Nth sub-circuit of the N sub-circuits includes an eighth switch, the first terminal of the eighth switch is connected to the power supply, and the second terminal of the eighth switch is connected to the second terminal of the capacitor in the (N-1)th sub-circuit; the level conversion unit is used to control the on / off state of the switches in the N sub-circuits according to the first driving signal, so that the on / off states of the third switch, the fourth switch, the fifth switch and the seventh switch are the same, and the on / off states of the sixth switch and the eighth switch are the same, and the on / off states of the third switch and the eighth switch are opposite, when the third switch is closed, a low level of the square wave signal is generated on the first output pin, and when the eighth switch is closed, a high level of the square wave signal is generated on the first output pin, and the output voltage of the power supply is equal to the power supply voltage of the touch chip.

[0020] In one possible implementation, the level conversion unit includes: a thirteenth switch, a fourteenth switch, a fifteenth switch, a seventh capacitor, and a DC-DC voltage conversion unit; the first terminal of the thirteenth switch is connected to a power supply, the second terminal of the thirteenth switch is connected to a second output pin, the first terminal of the seventh capacitor is connected to the second output pin, the second terminal of the seventh capacitor is connected to both the first terminal of the fourteenth switch and the first output pin, and the second terminal of the fourteenth switch is grounded; the input terminal of the DC-DC voltage conversion unit is connected to a power supply, the output terminal of the DC-DC voltage conversion unit is connected to the first terminal of the fifteenth switch, and the second terminal of the fifteenth switch is connected to the first output pin. The second terminal of the seven capacitors is connected; the DC voltage conversion unit is used to boost or buck the output voltage of the power supply; the level conversion unit is used to control the on / off state of the thirteenth switch, the fourteenth switch and the fifteenth switch according to the first drive signal, so that the on / off state of the thirteenth switch and the fourteenth switch are the same, and the on / off state of the thirteenth switch and the fifteenth switch are opposite. When the thirteenth switch is closed, a low level of the square wave signal is generated on the first output pin, and when the fifteenth switch is closed, a high level of the square wave signal is generated on the first output pin. The output voltage of the power supply is equal to the power supply voltage of the touch chip.

[0021] In one possible implementation, the touch chip includes a current conversion unit and a processing unit; the current conversion unit is used to generate an identification signal based on the sensing signal; the processing unit is used to identify the touch position based on the identification signal.

[0022] In one possible implementation, the current conversion unit includes a transimpedance amplifier, a first resistor, a second resistor, a first feedback resistor, a second feedback resistor, a third capacitor, a fourth capacitor, and an analog-to-digital converter (ADC). A first terminal of the first resistor is connected to the output terminal of the electrode, a second terminal of the first resistor is connected to the positive input terminal of the transimpedance amplifier, a first terminal of the second resistor is connected to a reference voltage, a second terminal of the second resistor is connected to the negative input terminal of the transimpedance amplifier, the negative output terminal of the transimpedance amplifier is connected to the first input terminal of the ADC, and the positive output terminal of the transimpedance amplifier is connected to the second input terminal of the ADC. The first terminal 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 third capacitor is connected to the first end of the first feedback resistor, the second end of the third capacitor is connected to the second end of the first feedback resistor, the first end of the fourth capacitor is connected to the first end of the second feedback resistor, and the second end of the fourth capacitor is connected to the second end of the second feedback resistor; the transimpedance amplifier is used to convert the induced signal into an identification voltage; the analog-to-digital converter is used to receive the identification voltage and convert the identification voltage into the identification signal.

[0023] In one possible implementation, the current conversion unit further includes: a low-pass filter; the first input terminal of the low-pass filter is connected to the negative output terminal of the transimpedance amplifier, the second input terminal of the low-pass filter is connected to the positive output terminal of the transimpedance amplifier, the first output terminal of the low-pass filter is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the low-pass filter is connected to the second input terminal of the analog-to-digital converter; the low-pass filter is used to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

[0024] In one possible implementation, the current conversion unit further includes a sample-and-hold module; the sample-and-hold module includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a fifth capacitor, and a sixth capacitor; the first terminal of the ninth switch is connected to the first output terminal of the low-pass filter, the second terminal of the ninth switch is connected to both the first terminal of the fifth capacitor and the first terminal of the tenth switch, the second terminal of the tenth switch is connected to the first input terminal of the analog-to-digital converter, and the second terminal of the fifth capacitor is grounded; the first terminal of the eleventh switch is connected to the second output terminal of the low-pass filter, the second terminal of the eleventh switch is connected to both the first terminal of the sixth capacitor and the first terminal of the twelfth switch, the second terminal of the twelfth switch is connected to the second input terminal of the analog-to-digital converter, and the second terminal of the sixth capacitor is grounded; the sample-and-hold module is used to hold the identification voltage.

[0025] In one possible implementation, the current conversion unit further includes: a buffer amplifier; the first input terminal of the buffer amplifier is connected to the second terminal of the tenth switch, the second input terminal of the buffer amplifier is connected to the second terminal of the twelfth switch, the first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is used to amplify the identification voltage.

[0026] According to a second aspect of the present application, a touch chip is provided, the touch chip being used to send a first driving signal to a touch unit, and to perform touch position recognition based on the touch unit responding to the first driving signal, and after the touch unit, the finger and the electrodes on the touch screen form a closed loop when the finger touches the screen, the sensing signal generated in the closed loop.

[0027] According to a third aspect of the present application, a display screen module is provided, including a touch device and electrodes as described in the first aspect of the present application, wherein the electrodes are used to form a closed loop with the touch unit and the finger when the finger touches the screen, wherein the electrodes include horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0028] According to a fourth aspect of the present application, an electronic device is provided, including a processor and a display screen module as described in the second aspect of the present application; the processor is electrically connected to the display screen module; the processor is configured to send a switching signal to the touch device, so that the touch chip in the touch device outputs a first driving signal to the touch unit or outputs a second driving signal to the electrode.

[0029] According to the embodiment of this application, the touch device includes a touch chip and a touch unit. The touch chip sends a first driving signal to the touch unit. When a finger touches the device, the touch unit, the finger, and the electrode form a closed loop. When the touch unit receives the first driving signal, an induction signal is generated in the closed loop. Thus, the touch chip can identify the touch position based on the induction signal. Since the induction signal is generated by the different equivalent capacitances between water and the touch unit, and between water and the electrode, and between the finger and the touch unit, and between the finger and the electrode, the induction signal is generated. Therefore, compared with the prior art of touch position identification through electrode self-capacitance or mutual capacitance, this touch device is applicable to touch position identification in underwater environments. Therefore, this touch device is applicable to touch position identification in various usage scenarios and has high applicability. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0031] Figure 1 is a schematic diagram of a touch device provided in an embodiment of this application;

[0032] Figure 2 is a schematic diagram of a touch device in conventional mode provided in an embodiment of this application;

[0033] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of this application;

[0034] Figure 4 is a schematic diagram of a touch unit provided in an embodiment of this application;

[0035] Figure 5 is a schematic diagram of an equivalent circuit of a closed loop provided in an embodiment of this application;

[0036] Figure 6 is a schematic diagram of a flexible circuit board provided in an embodiment of this application;

[0037] Figure 7 is a schematic diagram of another touch unit provided in an embodiment of this application;

[0038] Figure 8 is a schematic diagram of an equivalent circuit of another closed loop provided in an embodiment of this application;

[0039] Figure 9 is a schematic diagram of a touch device including a signal amplification module provided in an embodiment of this application;

[0040] Figure 10 is a schematic diagram of another touch unit provided in an embodiment of this application;

[0041] Figure 11 is a schematic diagram of the equivalent circuit of another closed loop provided in an embodiment of this application;

[0042] Figure 12 is a schematic diagram of a level conversion unit provided in an embodiment of this application;

[0043] Figure 13 is a circuit diagram of a level conversion unit provided in an embodiment of this application;

[0044] Figure 14 is a schematic diagram of an example of a level conversion unit provided in an embodiment of this application;

[0045] Figure 15 is a schematic diagram of another example of a level conversion unit provided in an embodiment of this application;

[0046] Figure 16 is a schematic diagram of an output voltage timing provided in an embodiment of this application;

[0047] Figure 17 is a circuit diagram of another level conversion unit provided in an embodiment of this application;

[0048] Figure 18 is a schematic diagram of another touch chip provided in an embodiment of this application;

[0049] Figure 19 is a circuit diagram of a current conversion unit provided in an embodiment of this application;

[0050] Figure 20 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0051] Figure 21 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0052] Figure 22 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0053] Figure 23 is a schematic diagram of a display screen module provided in an embodiment of this application;

[0054] Figure 24 is a schematic diagram of an electronic device provided in an embodiment of this application;

[0055] Figure 25 is a rendering of a touch position recognition method provided in an embodiment of this application. Detailed Implementation

[0056] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0057] As mentioned earlier, with the development of technology, electronic devices have become increasingly integrated, and more and more electronic devices support IP6X waterproofing. Many scenarios require the use of electronic devices underwater, such as using mobile phones, touchpads, and other devices that require touch control of the display screen. Currently, the touch devices included in the display screens of electronic devices use self-capacitance and / or mutual capacitance electrodes to recognize touch commands. However, because self-capacitance and / or mutual capacitance electrodes are quite sensitive to water when recognizing touch commands, they cannot recognize finger touch commands when the display screen is covered by water, rendering existing electronic devices unusable underwater.

[0058] This application provides a touch control device, which includes a touch chip and a touch unit. The touch chip sends a first driving signal to the touch unit. When a finger touches the screen, the touch unit, the finger, and the electrode form a closed loop. When the touch unit receives the first driving signal, an induction signal is generated within the closed loop. Thus, the touch chip can identify the touch position based on the induction signal. Since the induction signal is generated by the different equivalent capacitances between water and the touch unit, and between water and the electrode, and between the finger and the touch unit, and between the finger and the electrode, the induction signal is generated. Therefore, compared with the self-capacitance or mutual capacitance of electrodes in the prior art, this touch control device is suitable for touch position identification in underwater environments. Therefore, this touch control device is applicable to touch position identification in various usage scenarios and has high applicability.

[0059] The touch device provided in this application is described below through embodiments.

[0060] Figure 1 is a schematic diagram of a touch device provided in an embodiment of this application. As shown in Figure 1, the touch device 100 includes a touch chip 101 and a touch unit 102. The touch chip 101 can send a first driving signal to the touch unit 102, and the touch unit 102 can receive the first driving signal. When the finger touches the screen, the touch unit 102, the finger, and the electrode 401 on the touch screen form a closed loop, generating a sensing signal in the closed loop. The touch chip 101 identifies the touch position based on the sensing signal.

[0061] The touch device 100 includes a touch chip 101 and a touch unit 102. The touch chip 101 and the touch unit 102 are electrically connected. The touch chip 101 can send a first driving signal to the touch unit 102. In one example, the first driving signal can be a voltage signal, a sine wave signal, a square wave signal, a trapezoidal wave signal, etc.

[0062] When a finger touches the touchscreen, the finger, touch unit 102, and electrode 401 form a closed loop. Specifically, there is an equivalent capacitance between the finger and touch unit 102, and between the finger and electrode 401. Thus, the equivalent capacitance between the touch unit 102, the finger and touch unit 102, the finger, the finger and electrode 401, and electrode 401 form a closed loop. Since the touch unit 102 receives a first driving signal, an inductive signal can be generated in the closed loop. Specifically, in an underwater environment, there is an equivalent capacitance between water and touch unit 102, and between water and electrode 401. Therefore, the touch unit 102, water, and electrode 401 form a closed loop. When a finger touches the screen, because the equivalent capacitance between water and touch unit 102, and between water and electrode 401, is different from the equivalent capacitance between the finger and touch unit 102, and between the finger and electrode 401, the signal in electrode 401 changes, forming an inductive signal.

[0063] The touch chip 101 is electrically connected to the electrode 401. After receiving the sensing signal transmitted by the electrode 401, the touch chip 101 can identify the touch position based on the sensing signal. In one example, the touch chip 101 can convert the sensing signal into a digital signal and send the digital signal to the processor of the electronic device, thereby realizing touch position recognition.

[0064] In this embodiment, the touch chip 101 sends a first driving signal to the touch unit 102. When the finger touches the screen, the touch unit 102, the finger, and the electrode 401 form a closed loop. When the touch unit 102 receives the first driving signal, an induction signal is generated in the closed loop. Thus, the touch chip 101 can identify the touch position based on the induction signal. Since the signal generated by the difference between the equivalent capacitance between water and the touch unit 102, and between water and the electrode 401 and the equivalent capacitance between the finger and the touch unit 102, and between the finger and the electrode 401, is used to generate the induction signal, compared with the prior art of touch position identification through the self-capacitance or mutual capacitance of the electrode 401, this touch device 100 is applicable to touch position identification in underwater environments. Therefore, this touch device 100 is applicable to touch position identification in various usage scenarios and has high applicability.

[0065] Figure 2 is a schematic diagram of a touch device in conventional mode provided in an embodiment of this application. As shown in Figure 2, when the touch chip 101 receives a switching signal from the processor in the electronic device, the touch chip 101 stops sending the first driving signal to the touch unit 102, and the touch chip 101 sends the second driving signal to the electrode 401, and performs position recognition based on the touch signal output by the electrode 401. The electrode 401 includes multiple horizontal electrodes and / or multiple vertical electrodes.

[0066] When the touch chip 101 receives the switching signal from the processor, it switches from underwater touch mode to regular touch mode. The touch chip 101 stops sending the first driving signal to the touch unit 102, and then outputs a second driving signal to the electrode 401. This second driving signal can be a sine wave, square wave, trapezoidal wave, etc. When the electrode 401 receives the second driving signal, it generates a sensing signal, and the touch chip 101 identifies the touch position based on this signal.

[0067] It should be understood that, as shown in Figure 2, the plurality of electrodes 401 include horizontal electrodes and / or multiple vertical electrodes. The touch chip 101 is electrically connected to each electrode 401. When the plurality of horizontal electrodes and / or multiple vertical electrodes generate sensing signals, the touch chip 101 can detect the sensing signals generated in the plurality of horizontal electrodes and / or multiple vertical electrodes.

[0068] In this embodiment, when the touch chip 101 receives a switching signal, it stops outputting the first driving signal to the touch unit 102 and outputs the second driving signal to the electrode 401. This makes it suitable for touch position recognition in everyday use scenarios. Since the regular touch mode and underwater touch mode are switched according to the switching signal, it is suitable for touch position recognition in both everyday and underwater scenarios. It is applicable to touch position recognition in a variety of use scenarios and has high applicability.

[0069] In one possible implementation, when the electronic device is in underwater mode, the touch chip 101 sends a first drive signal to the touch unit 102, and when the electronic device is in non-underwater mode, the touch unit 101 sends a second drive signal to the electrode 401.

[0070] When the electronic device is in underwater mode, the touch unit 102 receives a first drive signal. An equivalent capacitance exists between the water and the touch unit 102, and between the water and the electrode 401. Therefore, the touch unit 102, the water, and the electrode 401 form a closed loop, generating a signal at the electrode 401. When a finger touches the device, because the equivalent capacitance between the water and the touch unit 102, and between the water and the electrode 401, differs from the equivalent capacitance between the finger and the touch unit 102, and between the finger and the electrode 401, the signal in the electrode 401 changes, forming an inductive signal.

[0071] When the electronic device is in non-underwater mode, the touch chip 101 stops sending the first driving signal to the touch unit 102. Then, the touch chip 101 outputs a second driving signal to the electrode 401. The second driving signal can be a sine wave, a square wave, or a trapezoidal wave, etc. When the electrode 401 receives the second driving signal, it generates a sensing signal, and the touch chip 101 identifies the touch position based on the sensing signal.

[0072] In one example, the underwater mode and the non-underwater mode can be switched by clicking the mode switching button displayed on the display screen of the electronic device. Specifically, after clicking the mode switching button displayed on the display screen, the processor of the electronic device sends a switching signal to the touch chip 101 to realize the switching between the underwater mode and the non-underwater mode.

[0073] In this embodiment, when the electronic device is in underwater mode, the touch chip 101 sends a first driving signal to the touch unit 102. When the electronic device is in non-underwater mode, the touch unit 101 sends a second driving signal to the electrode 401. Thus, the electronic device can switch between underwater and non-underwater modes. Therefore, this touch device is applicable to touch position recognition in both daily and underwater scenarios, and can be used for touch position recognition in various usage scenarios, making it highly adaptable.

[0074] In one possible implementation, the touch chip 101 sends a second drive signal to one of a plurality of horizontal electrodes and a plurality of vertical electrodes, and performs position recognition based on the touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes.

[0075] One of the multiple horizontal electrodes and multiple vertical electrodes serves as the driving electrode. The touch chip 101 outputs a driving signal to the driving electrode. The other of the multiple horizontal electrodes and multiple vertical electrodes serves as the receiving electrode and outputs a sensing signal. The touch chip 101 performs touch recognition based on the sensing signal and can identify the touch position of the finger. This method is a mutual capacitance detection method.

[0076] In addition, in another possible implementation, a self-capacitance detection method can be superimposed to identify the touch position of the finger. At least one of the multiple horizontal electrodes and multiple vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip 101 sends a driving signal to the driving electrode and performs position identification based on the sensing signal output by the receiving electrode. For example, the touch chip 101 outputs driving signals to multiple horizontal electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple horizontal electrodes (receiving electrodes); or the touch chip 101 outputs driving signals to multiple vertical electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple vertical electrodes (receiving electrodes); or the touch chip 101 simultaneously outputs driving signals to multiple horizontal electrodes and multiple vertical electrodes and simultaneously receives the sensing signals output by the multiple horizontal electrodes and multiple vertical electrodes. The touch chip 101 performs touch position identification based on the received sensing signals.

[0077] In this embodiment, when the touch chip 101 receives a switching signal, it stops outputting the first driving signal to the touch unit 102 and outputs the second driving signal to the electrode 401. Thus, the touch position can be identified by the electrode 401 using self-capacitance or mutual capacitance. This is applicable to touch position identification in daily use scenarios. Since the switching signal switches between daily and underwater scenarios, it is applicable to touch position identification in both daily and underwater scenarios. The touch device 100 is applicable to touch position identification in a variety of use scenarios and has high applicability.

[0078] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of this application. As shown in Figure 3, the touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is electrically connected to the touch unit 102 through the first pin 1012 of the touch chip 101. One end of the second switch K2 is connected to the first pin 1012, and the other end of the second switch K2 is grounded. When the first switch K1 is closed and the second switch K2 is open, the touch chip 101 sends a first driving signal to the touch unit 102 through the first pin 1012. When the first switch K1 is open and the second switch K2 is closed, the touch chip 101 sends a second driving signal to the electrode 401 through multiple second pins of the touch chip 101.

[0079] The touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is disposed between the signal generator 1011 and the first pin 1012. One end of the first pin 1012 is connected to the first switch K1, and the other end of the first pin 1012 is connected to the touch unit 102. One end of the second switch K2 is connected to the first pin 1012, 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 signal generator 1011 in the touch chip 101 generates a first driving signal and transmits the first driving signal to the first pin 1012 through the closed first switch K1. The first pin 1012 sends the first driving signal to the touch unit 102 which is electrically connected to the first pin 1012, thereby enabling touch position recognition in underwater scenarios.

[0080] When the second switch K2 is closed, the touch unit 102 is grounded through the first pin 1012 and the closed second switch K2. At this time, the touch unit 102 is short-circuited by the ground wire, and the touch chip 101 stops outputting the first drive signal to the touch unit 102. It should be understood that when the second switch K2 is closed, in order to prevent the touch chip 101 from leaking current to the ground wire, the first switch K1 will be opened. After the touch chip 101 stops outputting the first drive signal to the touch unit 102, it outputs the second drive signal to the electrode 401 through multiple second pins, so that touch position recognition can be performed in daily scenarios.

[0081] In this embodiment, the touch chip 101 includes a first switch K1 and a second switch K2. When the first switch K1 is closed and the second switch K2 is open, the touch chip 101 sends a first driving signal to the touch unit 102 through the first pin 1012. When the first switch K1 is open and the second switch K2 is closed, the touch chip 101 sends a second driving signal to the electrode 401 through multiple second pins. This enables switching between underwater touch recognition mode and daily touch recognition mode. Since the touch chip 101 can control the on / off state of the first switch K1 and the second switch K2 according to the switching signal sent by the processor, it can be used for touch position recognition in both daily and underwater scenarios. The touch device 100 can be used for touch position recognition in various usage scenarios and has high applicability.

[0082] Figure 4 is a schematic diagram of a touch unit provided in an embodiment of this application. As shown in Figure 4, the touch unit 102 includes a flexible circuit board 501. The flexible circuit board 501 is disposed on the housing 201 of the electronic device. The flexible circuit board 501 is electrically connected to the first pin 1012. The flexible circuit board 501 is used to receive a first driving signal. When the finger 300 touches the device, the flexible circuit board 501, the finger 300 and the electrode 401 form a closed loop, and the first driving signal is transmitted in the closed loop to generate a sensing signal.

[0083] The touch unit 102 includes a flexible circuit board 501, which can be disposed on the housing 201 of the electronic device. In one example, the flexible circuit board 501 can be adhered to the back cover of the electronic device; in another example, the flexible circuit board 501 can be adhered to the mid-frame of the electronic device. The flexible circuit board 501 is electrically connected to the first pin 1012 of the touch chip 101. The flexible circuit board 501 can receive a first drive signal sent by the touch chip 101. It should be understood that since the underwater touch recognition mode performs touch position recognition underwater, there is an equivalent capacitance between the flexible circuit board 501 and the water, as well as between the water and the electrode 401, forming a closed loop. And since the flexible circuit board 501 receives the first drive signal sent by the touch chip 101, a signal can be generated in the closed loop.

[0084] Figure 5 is a schematic diagram of the equivalent circuit of a closed loop provided in an embodiment of this application. As shown in Figure 5, when the finger 300 touches the circuit, the flexible circuit board 501 forms a closed loop with the finger 300 and the electrode 401. The electrode 401 can be a horizontal electrode and / or a vertical electrode. In Figure 5, the equivalent signal source L1 is the received first driving signal. The capacitor CHM1 is the equivalent capacitance between the finger 300 and the flexible circuit board 501, and the capacitor CHT1 is the equivalent capacitance between the finger 300 and the electrode 401. Since the equivalent capacitance between water and the flexible circuit board 501, and between water and the electrode 401 is different from the equivalent capacitance between the finger 300 and the flexible circuit board 501, and between the finger 300 and the electrode 401, the signal in the closed loop changes, i.e., a sensing signal is generated. The electrode 401 sends the sensing signal to the touch chip 101 through the pins of the touch chip 101. The touch chip 101 identifies the touch position based on the sensing signal.

[0085] In one example, when the touch chip 101 identifies the touch position based on the sensing signal, it can first detect the sensing signal generated by the horizontal electrode to obtain the Y-axis coordinate of the touch position, and then detect the sensing signal generated by the vertical electrode to obtain the X-axis coordinate of the touch position. Alternatively, it can detect the X-axis coordinate first and then the Y-axis coordinate. In another example, the touch chip 101 can simultaneously detect the sensing signals generated by the horizontal and vertical electrodes to directly obtain the X-axis and Y-axis coordinates of the touch position. In yet another example, the touch chip 101 can detect only the sensing signals generated by the horizontal or vertical electrodes, i.e., only the X-axis or Y-axis coordinates of the touch position. This is suitable for scenarios with low detection accuracy requirements. The specific detection method can be set as needed and is not limited here.

[0086] In this embodiment, the touch unit 102 includes a flexible circuit board 501, which is disposed on the housing 201 of the electronic device. When the finger 300 touches the device, the flexible circuit board 501, the finger 300, and the electrode 401 form a closed loop, and a first driving signal is transmitted in the closed loop to generate a sensing signal, thereby realizing underwater touch position recognition. Since the touch unit 102 is a flexible circuit board 501, it can be disposed on electronic devices with plastic housings, glass housings, and metal housings, and can be applied to electronic devices made of various materials. Furthermore, the sensing signal is generated by the different equivalent capacitances between water and the flexible circuit board 501, and between water and the electrode 401 compared with the equivalent capacitances between the finger 300 and the flexible circuit board 501, and between the finger 300 and the electrode 401. Compared with the prior art, which can only perform touch recognition in daily scenarios using self-capacitance or mutual-capacitance schemes, this touch device 100 can be applied to touch recognition in underwater environments. Therefore, this touch device 100 can be applied to touch recognition in various usage scenarios and has high applicability.

[0087] In one possible implementation, the flexible circuit board 501 includes at least one of annular flexible circuit board 501 and rectangular flexible circuit board 501.

[0088] Figure 6 is a schematic diagram of a flexible circuit board provided in an embodiment of this application. As shown in Figure 6, the flexible circuit board 501 may include a rectangular flexible circuit board 501 and an annular flexible circuit board 501. It should be understood that, as shown in Figure 6, multiple rectangular flexible circuit boards 501 can be disposed on at least one of the four sides of the electronic device housing.

[0089] Specifically, Figure 16(a) shows a schematic of a rectangular flexible circuit board 501 placed at the center of the electronic device housing; Figure 16(b) shows a schematic of a ring-shaped flexible circuit board 501 placed on the electronic device housing; Figure 16(c) shows a schematic of three rectangular flexible circuit boards 501 connected together and placed on three sides of the electronic device housing; and Figures 16(d) and (e) show schematics of two rectangular flexible circuit boards 501 placed on the top, bottom, left, or right sides of the electronic device housing.

[0090] In one example, the flexible circuit board 501 can also be a triangular flexible circuit board 501, a circular flexible circuit board 501, etc. The specific shape of the flexible circuit board 501 is not limited here.

[0091] In this embodiment, the flexible circuit board 501 includes at least one of annular flexible circuit board 501 and rectangular flexible circuit board 501, thereby enabling the circuit board to be disposed on the housing of the electronic device. The flexible circuit board 501 is configured as annular and rectangular to form a closed loop with fingers from all directions and electrodes 401, which can identify the touch position of the fingers when touch is performed in all directions underwater, and has high applicability.

[0092] Figure 7 is a schematic diagram of another touch unit provided in an embodiment of this application. As shown in Figure 7, the touch unit 102 includes: a metal casing 202 of an electronic device, the metal casing 202 being electrically connected to a first pin 1012, the metal casing 202 being used to receive a first driving signal, and when the finger touches the device, the metal casing 202, the finger, and the electrode 401 forming a closed loop, and transmitting the first driving signal in the closed loop to generate a sensing signal.

[0093] Since metal is conductive, the touch unit 102 can be a metal casing 202 of the electronic device. The metal casing 202 is electrically connected to the first pin 1012 of the touch chip 101. The metal casing 202 can receive the first drive signal sent by the touch chip 101. It should be understood that since the underwater touch recognition mode performs touch position recognition underwater, there is an equivalent capacitance between the metal casing 202 and the water, as well as between the water and the electrode 401, forming a closed loop. And since the metal casing 202 receives the first drive signal sent by the touch chip 101, it can generate a signal in the closed loop.

[0094] Figure 8 is a schematic diagram of the equivalent circuit of another closed loop provided in the embodiment of this application. As shown in Figure 8, when the finger 300 touches the screen, the metal shell 202 forms a closed loop with the finger 300 and the electrode 401. The electrode 401 can be a horizontal electrode and / or a vertical electrode. In Figure 8, the equivalent signal source L1 is the received first driving signal, the capacitor CHM2 is the equivalent capacitance between the finger 300 and the metal shell 202, and the capacitor CHT2 is the equivalent capacitance between the finger 300 and the electrode 401. Since the equivalent capacitance between water and the metal shell 202, and between water and the electrode 401 is different from the equivalent capacitance between the finger 300 and the metal shell 202, and between the finger 300 and the electrode 401, the signal in the closed loop changes, that is, a sensing signal is generated. The electrode 401 sends the sensing signal to the touch chip 101 through the pins of the touch chip 101. The touch chip 101 performs touch position recognition according to the sensing signal.

[0095] In one example, when the touch chip 101 identifies the touch position based on the sensing signal, it can first detect the sensing signal generated by the horizontal electrode to obtain the Y-axis coordinate of the touch position, and then detect the sensing signal generated by the vertical electrode to obtain the X-axis coordinate of the touch position. Alternatively, it can detect the X-axis coordinate first and then the Y-axis coordinate. In another example, the touch chip 101 can simultaneously detect the sensing signals generated by the horizontal and vertical electrodes to directly obtain the X-axis and Y-axis coordinates of the touch position. In yet another example, the touch chip 101 can detect only the sensing signals generated by the horizontal or vertical electrodes, i.e., only the X-axis or Y-axis coordinates of the touch position. This is suitable for scenarios with low detection accuracy requirements. The specific detection method can be set as needed and is not limited here.

[0096] In this embodiment, the touch unit 102 includes a metal casing 202 of the electronic device. When the finger 300 touches the device, the metal casing 202, the finger 300, and the electrode 401 form a closed loop, and a first driving signal is transmitted in the closed loop to generate a sensing signal, thereby realizing underwater touch position recognition. Since the touch unit 102 is the metal casing 202 of the electronic device, the electronic device with the metal casing 202 does not need to be additionally equipped with a touch unit 102, resulting in lower cost. Furthermore, the sensing signal is generated by the different equivalent capacitances between water and the metal casing 202, and between water and the electrode 401 compared to the equivalent capacitances between the finger 300 and the metal casing 202, and between the finger 300 and the electrode 401. Compared with the prior art of touch position recognition through the self-capacitance or mutual capacitance of the electrode 401, this touch device 100 is applicable to touch position recognition in underwater environments. Therefore, this touch device 100 is applicable to touch recognition in various usage scenarios and has high applicability.

[0097] Figure 9 is a schematic diagram of a touch device including a signal amplification module according to an embodiment of this application. As shown in Figure 9, the touch device 100 further includes a signal amplification module 103. The input terminal of the signal amplification module 103 is connected to the first pin 1012, and the output terminal of the signal amplification module 103 is connected to the touch unit 102. The signal amplification module 103 is used to amplify the level of the first driving signal and send the amplified first driving signal to the touch unit 102, so that the touch unit 102 transmits the amplified first driving signal in a closed loop.

[0098] The signal amplification module 103 can amplify the first driving signal output by the touch chip 101. The input terminal of the signal amplification module 103 receives the first driving signal sent by the touch chip 101 through the first pin 1012, then amplifies the first driving signal, and sends the amplified first driving signal to the touch unit 102, thereby enabling the touch unit 102 to generate a sensing signal based on the amplified first driving signal.

[0099] In one example, the difference between the peak and trough of the first driving signal before signal amplification is [1Vpp, 10Vpp], that is, the difference range is between 1Vpp and 10Vpp; the difference between the peak and trough of the first driving signal after signal amplification is [1Vpp, 30Vpp], that is, the difference range is between 1Vpp and 30Vpp.

[0100] In this embodiment, the touch device 100 also includes a signal amplification module 103, which amplifies the first driving signal output by the touch chip 101, increases the signal amplitude of the first driving signal, and allows the transmission of a first driving signal with a larger signal amplitude in a closed loop. This results in a larger signal amplitude in the generated sensing signal, thereby improving the sensitivity of the touch device 100 in recognizing the touch position.

[0101] Figure 10 is a schematic diagram of another touch unit provided in an embodiment of this application. As shown in Figure 10, the touch unit 102 includes a level conversion unit 104. The input pin 1041 of the level conversion unit 104 is electrically connected to the third pin 1013 of the touch chip 101. The first output pin 1042 of the level conversion unit 104 is electrically connected to the ground pin 1014 of the touch chip 101. The touch chip 101 sends a first driving signal to the level conversion unit 104 through the third pin 1013. The level conversion unit 104 generates a square wave signal according to the first driving signal and sends the square wave signal to the touch chip 101 through the ground pin 1014. When the finger touches the screen, the finger forms a closed loop with the electrode 401 and the ground pin 1014, so that the closed loop generates an induction signal.

[0102] The level conversion unit 104 can receive a first drive signal output by the touch chip 101 through the third pin 1013 via the input pin 1041. In one example, the first drive signal can be a Sync signal between the touch chip 101 and the level conversion unit 104, and the Sync signal is a square wave signal. After receiving the first drive signal, the level conversion unit 104 generates a square wave signal according to the first drive signal.

[0103] After the level conversion unit 104 generates a square wave signal, it sends the square wave signal to the ground pin 1014 of the touch chip 101 through the first output pin 1042. When a finger touches the screen, a closed loop is formed between the finger, the electrode 401, and the ground pin 1014 of the touch chip 101. Figure 11 is a schematic diagram of the equivalent circuit of another closed loop provided in this application embodiment. As shown in Figure 11, the finger 300 is equivalent to being grounded through the capacitor CHM3, and there is an equivalent capacitance CHT3 between the finger 300 and the electrode 401. The equivalent signal source L2 in Figure 11 is the square wave signal on the ground pin. It should be understood that since the square wave signal has high and low levels, it is equivalent to generating high and low level drive signals on the finger 300, thereby generating an induction signal in the closed loop when the finger 300 touches the screen.

[0104] In one example, Figure 12 is a schematic diagram of a level conversion unit provided in an embodiment of this application. As shown in Figure 12, the level conversion unit 104 may include a communication unit 1044. The communication unit 1044 can be electrically connected to a communication pin in the touch chip 101, for example, to an SPI pin in the touch chip. The touch chip 101 can communicate with the level conversion unit 104 through the communication pin to perform operations such as setting the level conversion unit 104. The communication unit 1044 can step down the communication signal output by the touch chip 101 and then send it to the processor in the electronic device. For example, it can step down the touch position coordinate signal output by the touch chip 101 and then send it to the processor in the electronic device. It should be understood that since the level conversion unit 104 generates a square wave signal and then sends the square wave signal... The reference voltage of the ground pin 1014 of the touch chip 101 is not 0V (ground line), but a square wave signal. When the square wave signal is high, the voltage of the communication signal generated by the touch chip 101 based on the reference voltage of the ground pin 1014 is relatively high. For example, when the ground pin 1014 of the touch chip 101 is 0V, the touch position coordinate signal output by the touch chip 101 is 3V. When the ground pin 1014 of the touch chip 101 is 10V, the touch position coordinate signal output by the touch chip 101 is 13V, and so on. At this time, the communication unit 1044 can reduce the voltage of the communication signal sent by the touch chip 101 before sending it to the processor. For example, the 13V communication signal can be reduced to a 3V communication signal to prevent the processor from being damaged by high voltage.

[0105] In this embodiment, the touch unit 102 includes a level conversion unit 104. After receiving the first driving signal, the level conversion unit 104 generates a square wave signal. Thus, when the finger 300 touches the screen, the finger 300, the electrode 401, and the ground pin 1014 form a closed loop. The square wave signal can be transmitted in the closed loop to generate a sensing signal. The electrode 401 can transmit the sensing signal to the touch chip 101 electrically connected to the electrode 401. Thus, the touch chip 101 can perform touch position recognition based on the sensing signal, realizing touch position recognition in underwater scenarios. Since the sensing signal is generated by the different equivalent capacitances between water and the finger 300 and the electrode 401, the sensing signal is generated. Compared with the existing technology, which can only perform touch recognition in daily scenarios, this touch device 100 can be applied to touch recognition in underwater environments. Therefore, this touch device 100 can be applied to touch recognition in various usage scenarios and has high applicability.

[0106] In one possible implementation, as shown in Figure 10, the second output pin 1043 of the level conversion unit 104 is connected to the power supply pin 1015 of the touch chip 101. The level conversion unit 104 can transmit power supply voltage to the touch chip 101 through the power supply pin 1015. The voltage difference between the power supply voltage and the square wave signal is equal to the power supply voltage of the touch chip 101.

[0107] Since the voltage of the ground pin 1014 of the touch chip 101 is a square wave signal, the second output pin 1043 of the level conversion unit 104 transmits the power supply voltage to the power supply pin 1015 of the touch chip 101. The voltage difference between the power supply pin 1015 and the ground pin 1014 of the touch chip 101 is the power supply voltage of the touch chip 101. That is, the voltage difference between the power supply voltage and the square wave signal is equal to the power supply voltage of the touch chip 101.

[0108] In one example, the power supply voltage fluctuates according to the voltage fluctuation of the square wave signal, and the voltage difference between the power supply voltage and the square wave signal is constant at 3V. For example, when the square wave signal is a low level signal 0V, the power supply voltage is 3V, and when the square wave signal is a high level signal 12V, the power supply voltage is 15V, and the voltage difference between the power supply voltage and the square wave signal is constant at 3V.

[0109] In this embodiment, the level conversion unit 104 can transmit power supply voltage to the touch chip 101 through the power supply pin 1015. This ensures that the power supply voltage of the touch chip 101 remains constant when the voltage of the ground pin 1014 of the touch chip 101 is the square wave signal output by the level conversion unit 104, thus guaranteeing the stable power supply of the touch chip 101 and enabling the touch chip 101 to work normally.

[0110] Figure 13 is a circuit diagram of a level conversion unit provided in an embodiment of this application. As shown in Figure 13, the level conversion unit 104 includes N sub-circuits, where N is an integer greater than or equal to 2. The first sub-circuit of the N sub-circuits includes a third switch K3, a fourth switch K4, and a first capacitor C1. The first end of the third switch K3 is connected to the power supply AVDD, and the second end of the third switch K3 is connected to the second output pin 1043. The first end of the first capacitor C1 is connected to the second output pin 1043, and the second end of the first capacitor C1 is connected to the first end of the fourth switch K4 and the first output pin 1042, respectively. The second end of the fourth switch K4 is grounded.

[0111] The i-th sub-circuit in the N sub-circuits includes a fifth switch K5, a sixth switch K6, a seventh switch K7, and a second capacitor C2. The first terminal of the fifth switch K5 is connected to the power supply AVDD. The second terminal of the fifth switch K5 is connected to the first terminal of the sixth switch K6. The second terminal of the sixth switch K6 is connected to the second terminal of the capacitor in the (i-1)-th sub-circuit. The first terminal of the second capacitor C2 is connected to the second terminal of the fifth switch K5. The second terminal of the second capacitor C2 is connected to the first terminal of the seventh switch K7. The second terminal of the seventh switch K7 is grounded. Here, i is an integer greater than 1 and less than N.

[0112] The Nth sub-circuit in the N sub-circuit includes an eighth switch K8. The first end of the eighth switch K8 is connected to the power supply AVDD, and the second end of the eighth switch K8 is connected to the second end of the capacitor in the (N-1)th sub-circuit.

[0113] The level conversion unit 104 is used to control the on / off state of the switches in the N sub-circuits according to the first drive signal, so that the on / off states of the third switch K3, the fourth switch K4, the fifth switch K5 and the seventh switch K7 are the same, and the on / off states of the sixth switch K6 and the eighth switch K8 are the same, while the on / off states of the third switch K3 and the eighth switch K8 are opposite. When the third switch K3 is closed, a low level of square wave signal is generated on the first output pin 1042, and when the eighth switch K8 is closed, a high level of square wave signal is generated on the first output pin 1042. The output voltage of the power supply AVDD is equal to the power supply voltage of the touch chip 101.

[0114] The level conversion unit 104 controls the on / off state of the switches in N sub-circuits according to the first drive signal. In one example, when the first drive signal is at the first level, the third switch K3, the fourth switch K4, the fifth switch K5 and the seventh switch K7 are closed, and the sixth switch K6 and the eighth switch K8 are open. At this time, the capacitors in the circuit are charged through the power supply AVDD. When the first drive signal is at the second level, the third switch K3, the fourth switch K4, the fifth switch K5 and the seventh switch K7 are open, and the sixth switch K6 and the eighth switch K8 are closed. The capacitors and the power supply AVDD together output voltage to the first output pin 1042 and the second output pin 1043 of the level conversion unit 104. It should be understood that since the first output pin 1042 and the second output pin 1043 are connected to the first capacitor C1, the voltage output by the first capacitor C1 is always different between the first output pin 1042 and the second output pin 1043.

[0115] The following explanation uses a power supply AVDD with an output voltage of 3V, and takes N=2 and N=3 as examples.

[0116] Figure 14 is a schematic diagram of an example of a level conversion unit provided in an embodiment of this application. As shown in Figure 14, when N=2, only the first sub-circuit and the second sub-circuit exist. As shown in Figure 14(a), when the first drive signal is at the first level, the third switch K3 and the fourth switch K4 are closed, and the eighth switch K8 is open. At this time, the power supply AVDD charges the first capacitor C1, and the charging voltage of the first capacitor C1 is 3V. The first output pin 1042 outputs 0V voltage, and the voltage output by the second output pin 1043 is the output voltage 3V of the power supply AVDD connected to the third switch K3. As shown in Figure 14(b), when the first... When the driving signal is at the second level, the third switch K3 and the fourth switch K4 are open, and the eighth switch K8 is closed. The power supply AVDD connected to the eighth switch K8 and the first capacitor C1 together output a voltage of 6V, which is twice the power supply AVDD, to the second output pin 1043. The power supply AVDD connected to the eighth switch K8 outputs a voltage of 3V, which is once the power supply AVDD, to the first output pin 1042. The voltage difference of 3V between the first output pin 1042 and the second output pin 1043 powers the touch chip 101. Since the first driving signal is a square wave signal, the first output pin 1042 outputs a square wave signal of 0V-3V at this time.

[0117] Figure 15 is a schematic diagram of another example of a level conversion unit provided in an embodiment of this application. As shown in Figure 15, when N=3, there are a first sub-circuit, a second sub-circuit, and a third sub-circuit. As shown in Figure 15(a), when the first drive signal is at the first level, the third switch K3, the fourth switch K4, the fifth switch K5, and the seventh switch K7 are closed, and the sixth switch K6 and the eighth switch K8 are open. At this time, the power supply AVDD charges the first capacitor C1 and the second capacitor C2. The charging voltage of the first capacitor C1 and the second capacitor C2 is 3V. The first output pin 1042 outputs a voltage of 0V, and the voltage output by the second output pin 1043 is the output voltage of the power supply AVDD connected to the third switch K3, which is 3V. As shown in Figure 15(b), when the first drive signal is at the first level, the third switch K3 is at the first level. When the driving signal is at the second level, the third switch K3, the fourth switch K4, the fifth switch K5, and the seventh switch K7 are open, and the sixth switch K6 and the eighth switch K8 are closed. The power supply AVDD connected to the eighth switch K8, together with the first capacitor C1 and the second capacitor C2, outputs a voltage of 9V, which is 3 times the output voltage of the power supply AVDD, to the second output pin 1043. The power supply AVDD connected to the eighth switch K8 and the second capacitor C2 together output a voltage of 6V, which is 2 times the output voltage of the power supply AVDD, to the first output pin 1042. The voltage difference of 3V between the first output pin 1042 and the second output pin 1043 powers the touch chip 101. Since the first driving signal is a square wave signal, the first output pin 1042 outputs a square wave signal of 0V-6V at this time.

[0118] Figure 16 is a schematic diagram of an output voltage timing provided in an embodiment of this application. As shown in Figure 16, when the first drive signal is low, the second output pin 1043 outputs AVDD output voltage and the first output pin 1042 outputs 0V voltage. When the first drive signal is high, the second output pin 1043 outputs N times the AVDD output voltage and the first output pin 1042 outputs N-1 times the AVDD output voltage, where N is the number of sub-circuits.

[0119] In this embodiment, the first output pin 1042 of the level conversion unit outputs a square wave signal by controlling the on / off state of the switches in the N sub-circuits, and the second output pin 1043 outputs a power supply voltage AVDD with a constant voltage difference from the output voltage of the first output pin 1042. This realizes the generation of the square wave signal and the constant voltage power supply to the touch chip 101. Thus, the square wave signal can be transmitted in a closed loop, and the touch chip 101 can perform touch position recognition on the sensing signal.

[0120] Figure 17 is a circuit diagram of another level conversion unit provided in an embodiment of this application. As shown in Figure 17, the level conversion unit 104 includes: a thirteenth switch K13, a fourteenth switch K14, a fifteenth switch K15, a seventh capacitor C7, and a DC / DC converter. The first terminal of the thirteenth switch K13 is connected to the power supply AVDD, and the second terminal of the thirteenth switch K13 is connected to the second output pin 1043. The first terminal of the seventh capacitor C7 is connected to the second output pin 1043, and the second terminal of the seventh capacitor C7 is connected to the first terminal of the fourteenth switch K14 and the first output pin 1042, respectively. The second terminal of the fourteenth switch K14 is grounded. The input terminal of the DC / DC converter is connected to the power supply AVDD, and the output terminal of the DC / DC converter is connected to the fifteenth switch K15. The first terminal of K15 is connected, and the second terminal of the fifteenth switch K15 is connected to the second terminal of the seventh capacitor C7. The DC / DC converter can boost or buck the output voltage of the power supply AVDD. The level conversion unit 104 is used to control the on / off state of the thirteenth switch K13, the fourteenth switch K14, and the fifteenth switch K15 according to the first drive signal, so that the on / off state of the thirteenth switch K13 and the fourteenth switch K14 is the same, and the on / off state of the thirteenth switch K13 and the fifteenth switch K15 is opposite. When the thirteenth switch K13 is closed, a low level of square wave signal is generated on the first output pin 1042. When the fifteenth switch K15 is closed, a high level of square wave signal is generated on the first output pin 1042. The output voltage of the power supply AVDD is equal to the power supply voltage of the touch chip 101.

[0121] In one example, as shown in Figure 17(a), when the first drive signal is at the first level, the thirteenth switch K13 and the fourteenth switch K14 are closed, and the fifteenth switch K15 is open. At this time, the seventh capacitor C7 in the circuit is charged through the power supply AVDD. As shown in Figure 17(b), when the first drive signal is at the second level, the thirteenth switch K13 and the fourteenth switch K14 are open, and the fifteenth switch K15 is closed. The seventh capacitor C7 and the DC / DC converter jointly output voltage to the first output pin 1042 and the second output pin 1043 of the level conversion unit 104. It should be understood that since the seventh capacitor C7 is connected in the first output pin 1042 and the second output pin 1043, there is a constant phase difference between the first output pin 1042 and the second output pin 1043, which is the voltage output by the seventh capacitor C7.

[0122] The following example uses a power supply AVDD outputting a 3V voltage, with the DC / DC converter boosting the AVDD output voltage by M times. As shown in Figure 17(a), when the first drive signal is at the first level, the thirteenth switch K13 and the fourteenth switch K14 are closed, and the fifteenth switch K15 is open. At this time, the power supply AVDD charges the seventh capacitor C7, and the charging voltage of the seventh capacitor C7 is 3V. The first output pin 1042 outputs a 0V voltage, and the second output pin 1043 outputs the 3V output voltage of the power supply AVDD connected to the thirteenth switch K13, as shown in Figure 17(b). When the first drive signal is at the second level, the thirteenth switch K13 and the fourteenth switch K14 are open, and the fifteenth switch K15 is closed. The fifteenth switch K15 is connected to the... The DC / DC converter and the seventh capacitor C7 together output an output voltage of 3*(M+1)V, which is M+1 times the power supply AVDD, to the second output pin 1043. The DC / DC converter connected to the fifteenth switch K15 outputs an output voltage of 3*MV, which is M times the power supply AVDD, to the first output pin 1042. The voltage difference of 3V between the first output pin 1042 and the second output pin 1043 powers the touch chip 101. Since the first drive signal is a square wave signal, the first output pin 1042 outputs a square wave signal of 0V-3*MV. It should be understood that since the DC / DC converter can boost or buck the power supply AVDD output voltage in a way that is not an integer multiple, M is a natural number greater than or equal to 0.

[0123] It should be understood that the DC / DC converter can be a boost circuit, such as a boost DC / DC circuit, or the DC / DC converter can be a buck circuit, such as a buck DC / DC circuit. The specific circuit can be set as needed. It should also be understood that the scheme of the DC / DC converter stepping down the output voltage of the power supply AVDD is similar in principle to the scheme of the DC / DC converter stepping up the output voltage of the power supply AVDD in the above embodiment, and will not be described again here.

[0124] In this embodiment, by controlling the on / off states of the thirteenth switch K13, the fourteenth switch K14, and the fifteenth switch K15, the first output pin 1042 of the level conversion unit 104 outputs a square wave signal, and the second output pin 1043 outputs a power supply voltage AVDD with a constant voltage difference from the output voltage of the first output pin 1042. This achieves the generation of the square wave signal and provides constant voltage power to the touch chip 101. Thus, the square wave signal can be transmitted in a closed loop, and the touch chip 101 can perform touch position recognition on the sensing signal.

[0125] Figure 18 is a schematic diagram of another touch chip provided in an embodiment of this application. As shown in Figure 18, the touch chip 101 includes a current conversion unit 1016 and a processing unit 1017. The current conversion unit 1016 can generate an identification signal according to the sensing signal, and the processing unit 1017 can identify the touch position according to the identification signal.

[0126] In this embodiment of the application, the touch chip 101 includes a current conversion unit 1016 and a processing unit 1017. The current conversion unit 1016 can receive the sensing signal and convert the sensing signal into an identification signal. The processing unit 1017 can identify the touch position based on the identification signal, thereby realizing the identification of the touch position.

[0127] Figure 19 is a circuit diagram of a current conversion unit provided in an embodiment of this application. As shown in Figure 19, the current conversion unit includes a transimpedance amplifier D1, a first resistor R1, a second resistor R2, a first feedback resistor Rf1, a second feedback resistor Rf2, a third capacitor C3, a fourth capacitor C4, and an analog-to-digital converter 10161. The first end of the first resistor R1 is connected to an electrode, and the second end of the first resistor R1 is connected to the positive input terminal of the transimpedance amplifier D1. The first end of the second resistor R2 is connected to the reference voltage VCMI, and the second end of the second resistor R2 is connected to the negative input terminal of the transimpedance amplifier D1. The negative output terminal of the transimpedance amplifier D1 is connected to the first input terminal of the analog-to-digital converter 10161, and the positive output terminal of the transimpedance amplifier D1 is connected to the second input terminal of the analog-to-digital converter 10161. The first feedback resistor Rf1... The first terminal of the first feedback resistor Rf1 is connected to the positive input terminal of the transimpedance amplifier D1. The second terminal of the first feedback resistor Rf1 is connected to the negative output terminal of the transimpedance amplifier D1. The first terminal of the second feedback resistor Rf2 is connected to the negative input terminal of the transimpedance amplifier D1, and the second terminal of the second feedback resistor Rf2 is connected to the positive output terminal of the transimpedance amplifier D1. The first terminal of the third capacitor C3 is connected to the first terminal of the first feedback resistor Rf1, and the second terminal of the third capacitor C3 is connected to the second terminal of the first feedback resistor Rf1. The first terminal of the fourth capacitor C4 is connected to the first terminal of the second feedback resistor Rf2, and the second terminal of the fourth capacitor C4 is connected to the second terminal of the second feedback resistor Rf2. The transimpedance amplifier D1 can convert the induced signal into an identification voltage. The analog-to-digital converter 10161 can receive the identification voltage and convert it into an identification signal.

[0128] In one example, the induced signal is a current signal. The identified current can be converted into a square wave signal through the feedback resistor, capacitor and transimpedance amplifier D1. Specifically, the identified current is applied to the feedback resistor. The transimpedance amplifier D1 identifies the voltage across the feedback resistor and compares it with the reference voltage VCMI to generate a square wave signal. The square wave signal output by the transimpedance amplifier D1 can be converted into a digital signal through the analog-to-digital converter 10161.

[0129] In this embodiment, the transimpedance amplifier D1 can amplify the identification current and convert the induced signal into an identification voltage. The analog-to-digital converter 10161 can convert the identification voltage into a digital signal, thereby converting the identification current into an identification signal. This allows the processor to identify touch commands based on the identification signal, thus achieving touch recognition.

[0130] Figure 20 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 20, the current conversion unit 1016 further includes a low-pass filter 10162. The first input terminal of the low-pass filter 10162 is connected to the negative output terminal of the transimpedance amplifier D1, the second input terminal of the low-pass filter 10162 is connected to the positive output terminal of the transimpedance amplifier D1, the first output terminal of the low-pass filter 10162 is connected to the first input terminal of the analog-to-digital converter 10161, and the second output terminal of the low-pass filter 10162 is connected to the second input terminal of the analog-to-digital converter 10161. The low-pass filter 10162 can perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

[0131] In this embodiment, the current conversion unit 1016 further includes a low-pass filter 10162, which can perform low-pass filtering on the recognition voltage to reduce external signal interference in the recognition voltage, such as filtering out out-of-band signal interference or signal noise. At the same time, it can also prevent the Nyquist aliasing effect, improve the signal-to-noise ratio of the recognition voltage input to the analog-to-digital converter 10161, and reduce the recognition signal corresponding to external signal interference in the recognition signal converted by the analog-to-digital converter 10161, thereby reducing the impact of external signal interference on touch recognition and improving the accuracy of touch recognition.

[0132] Figure 21 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 21, the current conversion unit 1016 further includes a sample-and-hold module 10163. The sample-and-hold module 10163 includes a ninth switch K9, a tenth switch K10, an eleventh switch K11, a twelfth switch K12, a fifth capacitor C5, and a sixth capacitor C6. The first terminal of the ninth switch K9 is connected to the first output terminal of the low-pass filter 10162, and the second terminal of the ninth switch K9 is connected to both the first terminal of the fifth capacitor C5 and the first terminal of the tenth switch K10. The second terminal of the tenth switch K10 is connected to the first input terminal of the analog-to-digital converter 10161, the second terminal of the fifth capacitor C5 is grounded, the first terminal of the eleventh switch K11 is connected to the second output terminal of the low-pass filter 10162, the second terminal of the eleventh switch K11 is simultaneously connected to the first terminal of the sixth capacitor C6 and the first terminal of the twelfth switch K12, the second terminal of the twelfth switch K12 is connected to the second input terminal of the analog-to-digital converter 10161, the second terminal of the sixth capacitor C6 is grounded, and the sample-and-hold module 10163 can maintain the identification voltage.

[0133] Since the induced signal is a changing signal, the identification voltage output by the transimpedance amplifier D1, i.e., the square wave signal, is also a changing square wave signal. To ensure that all signals input to the analog-to-digital converter 10161 are converted into identification signals, a sample-and-hold circuit is provided. This circuit can temporarily store the subsequent identification voltage during the digital-to-analog conversion by the analog-to-digital converter 10161, preventing the analog-to-digital converter 10161 from missing part of the identification voltage due to changes in the identification voltage. Specifically, during the digital-to-analog conversion by the analog-to-digital converter 10161, the tenth switch can be... When switch K10 and / or the twelfth switch K12 are open, the identification voltage is temporarily stored through the fifth capacitor C5 and the sixth capacitor C6. When the analog-to-digital converter 10161 is idle, switch K9 and / or the eleventh switch K11 are opened, and switch K10 and / or the twelfth switch K12 are closed, so that the analog-to-digital converter 10161 receives the identification voltage temporarily stored in the capacitor. The sampling and holding effect is achieved through switch K9, switch K10, switch K11, switch K12, fifth capacitor C5 and sixth capacitor C6.

[0134] In this embodiment, the current conversion unit 1016 further includes a sample-and-hold module 10163. The sample-and-hold module 10163 can sample and hold the recognition voltage output by the transimpedance amplifier D1 through the ninth switch K9, the tenth switch K10, the eleventh switch K11, the twelfth switch K12, the fifth capacitor C5, and the sixth capacitor C6. This can prevent the recognition voltage from changing due to changes in the sensing signal, thus avoiding the analog-to-digital converter 10161 from missing part of the recognition voltage. It can ensure that the analog-to-digital converter 10161 converts all the recognition voltages into recognition signals, thereby improving the accuracy of touch recognition.

[0135] Figure 22 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 22, the current conversion unit 1016 further includes: a buffer amplifier 10164. The first input terminal of the buffer amplifier 10164 is connected to the second terminal of the tenth switch K10, the second input terminal of the buffer amplifier 10164 is connected to the second terminal of the twelfth switch K12, the first output terminal of the buffer amplifier 10164 is connected to the first input terminal of the analog-to-digital converter 10161, and the second output terminal of the buffer amplifier 10164 is connected to the second input terminal of the analog-to-digital converter 10161. The buffer amplifier 10164 can perform signal amplification processing on the identified voltage.

[0136] In this embodiment, the current conversion unit 1016 further includes a buffer amplifier 10164. The buffer amplifier 10164 can amplify the recognition voltage signal. The buffer amplifier 10164 can be a level converter or a buffer, etc. Specifically, it can increase the high level and decrease the low level in the recognition voltage to amplify the signal amplitude. This allows the recognition voltage signal amplitude input to the analog-to-digital converter 10161 to be larger, avoiding the inability of the analog-to-digital converter 10161 to convert the recognition voltage into a recognition signal due to a small recognition voltage, thus improving the accuracy of touch recognition.

[0137] This application embodiment also provides a touch chip, which is used to send a first driving signal to a touch unit, and to identify the touch position based on the touch unit responding to the first driving signal and the touch unit, the finger and the electrodes on the touch screen forming a closed loop when the finger touches the screen, and the sensing signal generated in the closed loop.

[0138] In this embodiment, the touch chip 101 can be any of the touch chips 101 in the above embodiments, and can perform the operations in any of the above embodiments, which will not be described again here.

[0139] Figure 23 is a schematic diagram of a display screen module provided in an embodiment of this application. As shown in Figure 23, the display screen module 400 includes the touch device 100 and electrode 401 in any of the above embodiments. The electrode 401 is used to form a closed loop with the touch unit 102 and the finger when the finger touches the screen. The electrode 401 includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0140] Figure 24 is a schematic diagram of an electronic device provided in an embodiment of this application. As shown in Figure 24, the electronic device 200 includes a processor 203 and a display screen module 400 in the above embodiment. The processor 203 is electrically connected to the display screen module 400. The processor 203 is used to send a switching signal to the touch device 100, so that the touch chip 101 in the touch device 100 outputs a first driving signal to the touch unit 102 or outputs a second driving signal to the electrode 401.

[0141] In this embodiment, the processor 203 can send a switching signal to the touch device 100, causing the touch chip 101 in the touch device 100 to output a first driving signal to the touch unit 102 or a second driving signal to the electrode 401. This allows switching between daily use scenarios and underwater use scenarios. Since the switching between the regular touch mode and the underwater touch mode is based on the switching signal, it is applicable to touch position recognition in both daily and underwater scenarios. It is applicable to touch position recognition in various use scenarios and has high applicability.

[0142] Figure 25 is an effect diagram of touch position recognition provided by an embodiment of this application. Figure 25 is applicable to the effect produced in any embodiment of this application. As shown in Figure 25, the three horizontal images are different frames collected at the same time, and the three vertical images are schematic diagrams of the finger in different positions. The horizontal axis of each table in Figure 25 is used to represent different electrodes, and the vertical axis is used to represent the signal amount of the envelope signal. As shown in Figure 25, the envelope signal is different when the finger is in different positions, so touch position recognition can be performed underwater.

[0143] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the method embodiments, since they are basically similar to the methods described in the apparatus and system embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions of other embodiments.

[0144] It should be understood that the foregoing describes specific embodiments of this specification. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0145] It should be understood that the use of a singular form to describe an element or to show only one element in the accompanying drawings does not imply that the number of such element is limited to one. Furthermore, modules or elements described or shown as separate herein may be combined into a single module or element, and modules or elements described or shown as single herein may be broken down into multiple modules or elements.

[0146] It should also be understood that the terminology and expressions used herein are for descriptive purposes only, and one or more embodiments described herein should not be limited to these terms and expressions. The use of these terms and expressions does not exclude any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

Claims

1. A touch device, characterized in that, include: A touch chip, wherein the touch chip is used to send a first driving signal to the touch unit; The touch unit is used to receive the first driving signal. When the finger touches the screen, the touch unit, the finger, and the electrodes on the touch screen form a closed loop, and a sensing signal is generated in the closed loop. The touch chip identifies the touch position based on the sensing signal.

2. The touch device according to claim 1, characterized in that, When the touch chip receives a switching signal from the processor in the electronic device, the touch chip stops sending the first driving signal to the touch unit, and sends a second driving signal to the electrode, and performs position recognition based on the touch signal output by the electrode, wherein the electrode includes multiple horizontal electrodes and / or multiple vertical electrodes.

3. The touch device according to claim 2, characterized in that, When the electronic device is in underwater mode, the touch chip sends a first driving signal to the touch unit; when the electronic device is in non-underwater mode, the touch unit sends a second driving signal to the electrode.

4. The touch device according to claim 2, characterized in that, The touch chip sends the second driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and performs position recognition based on the touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes.

5. The touch device according to claim 2, characterized in that, At least one of the plurality of horizontal electrodes and the plurality of vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip sends the second driving signal to the driving electrode and performs position recognition based on the touch signal output by the receiving electrode.

6. The touch device according to claim 2, characterized in that, The touch chip includes: a first switch and a second switch; The first switch is electrically connected to the touch unit through the first pin of the touch chip, one end of the second switch is connected to the first pin, and the other end of the second switch is grounded; When the first switch is closed and the second switch is open, the touch chip sends the first drive signal to the touch unit through the first pin; When the first switch is open and the second switch is closed, the touch chip sends the second drive signal to the electrode through a plurality of second pins of the touch chip.

7. The touch device according to claim 6, characterized in that, The touch unit includes: a flexible circuit board; The flexible circuit board is disposed on the housing of the electronic device. The flexible circuit board is electrically connected to the first pin. The flexible circuit board is used to receive the first driving signal. When the finger touches the device, the flexible circuit board, the finger, and the electrode form the closed loop and transmit the first driving signal in the closed loop to generate the sensing signal.

8. The touch device according to claim 7, characterized in that, The flexible circuit board includes at least one of a ring-shaped flexible circuit board and a rectangular flexible circuit board.

9. The touch device according to claim 6, characterized in that, The touch unit includes: the metal casing of the electronic device; The metal casing is electrically connected to the first pin. The metal casing of the electronic device is used to receive the first driving signal. When the finger touches the screen, the metal casing, the finger, and the electrode form the closed loop, and the first driving signal is transmitted in the closed loop to generate the sensing signal.

10. The touch device according to any one of claims 7-9, characterized in that, The touch device also includes: a signal amplification module; The input terminal of the signal amplification module is connected to the first pin, and the output terminal of the signal amplification module is connected to the touch unit. The signal amplification module is used to amplify the level of the first driving signal and send the amplified first driving signal to the touch unit, so that the touch unit transmits the amplified first driving signal in the closed loop.

11. The touch device according to claim 1, characterized in that, The touch unit includes: a level conversion unit; The input pin of the level conversion unit is electrically connected to the third pin of the touch chip, and the first output pin of the level conversion unit is electrically connected to the ground pin of the touch chip. The touch chip sends the first driving signal to the level conversion unit through the third pin. The level conversion unit generates a square wave signal according to the first driving signal and sends the square wave signal to the touch chip through the ground pin. When the finger touches the screen, the finger forms a closed loop with the electrode and the ground pin, so that the closed loop generates the sensing signal.

12. The touch device according to claim 11, characterized in that, The second output pin of the level conversion unit is connected to the power supply pin of the touch chip; The level conversion unit is used to transmit power voltage to the touch chip through the power supply pin, and the power voltage is related to the square wave signal. The voltage difference is equal to the power supply voltage of the touch chip.

13. The touch device according to claim 12, characterized in that, The level conversion unit includes N sub-circuits, where N is an integer greater than or equal to 2; The first sub-circuit of the N sub-circuits includes a third switch, a fourth switch, and a first capacitor. The first terminal of the third switch is connected to the power supply, the second terminal of the third switch is connected to the second output pin, the first terminal of the first capacitor is connected to the second output pin, the second terminal of the first capacitor is connected to the first terminal of the fourth switch and the first output pin, and the second terminal of the fourth switch is grounded. The i-th sub-circuit of the N sub-circuits includes a fifth switch, a sixth switch, a seventh switch, and a second capacitor. The first terminal of the fifth switch is connected to the power supply, the second terminal of the fifth switch is connected to the first terminal of the sixth switch, the second terminal of the sixth switch is connected to the second terminal of the capacitor in the (i-1)-th sub-circuit, the first terminal of the second capacitor is connected to the second terminal of the fifth switch, the second terminal of the second capacitor is connected to the first terminal of the seventh switch, and the second terminal of the seventh switch is grounded. Here, i is an integer greater than 1 and less than N. The Nth sub-circuit of the N sub-circuits includes an eighth switch, the first end of which is connected to the power supply, and the second end of which is connected to the second end of the capacitor in the (N-1)th sub-circuit. The level conversion unit is used to control the on / off state of the switches in the N sub-circuits according to the first driving signal, so that the on / off states of the third switch, the fourth switch, the fifth switch and the seventh switch are the same, and the on / off states of the sixth switch and the eighth switch are the same, while the on / off states of the third switch and the eighth switch are opposite. When the third switch is closed, a low level of the square wave signal is generated on the first output pin, and when the eighth switch is closed, a high level of the square wave signal is generated on the first output pin. The output voltage of the power supply is equal to the power supply voltage of the touch chip.

14. The touch device according to claim 12, characterized in that, The level conversion unit includes: a thirteenth switch, a fourteenth switch, a fifteenth switch, a seventh capacitor, and a DC voltage conversion unit; The first terminal of the thirteenth switch is connected to the power supply, the second terminal of the thirteenth switch is connected to the second output pin, the first terminal of the seventh capacitor is connected to the second output pin, the second terminal of the seventh capacitor is connected to the first terminal of the fourteenth switch and the first output pin respectively, and the second terminal of the fourteenth switch is grounded. The input terminal of the DC voltage conversion unit is connected to the power supply, the output terminal of the DC voltage conversion unit is connected to the first terminal of the fifteenth switch, and the second terminal of the fifteenth switch is connected to the second terminal of the seventh capacitor. The DC-DC voltage conversion unit is used to boost or buck the output voltage of the power supply. The level conversion unit is used to control the on / off state of the thirteenth switch, the fourteenth switch, and the fifteenth switch according to the first driving signal, so that the on / off state of the thirteenth switch and the fourteenth switch are the same, and the on / off state of the thirteenth switch and the fifteenth switch are opposite. When the thirteenth switch is closed, a low level of the square wave signal is generated on the first output pin, and when the fifteenth switch is closed, a high level of the square wave signal is generated on the first output pin. The output voltage of the power supply is equal to the power supply voltage of the touch chip.

15. The touch device according to claim 1, characterized in that, The touch chip includes a current conversion unit and a processing unit; The current conversion unit is used to generate an identification signal based on the sensing signal; The processing unit is used to identify the touch position based on the recognition signal.

16. The touch device according to claim 15, characterized in that, The current conversion unit includes a transimpedance amplifier, a first resistor, a second resistor, a first feedback resistor, a second feedback resistor, a third capacitor, a fourth capacitor, and an analog-to-digital converter; The first end of the first resistor is connected to the output terminal of the electrode, the second end of the first resistor is connected to the positive input terminal of the transimpedance amplifier, the first end of the second resistor is connected to the reference voltage, the second end of the second resistor is connected to the negative input terminal of the transimpedance amplifier, the negative output terminal of the transimpedance amplifier is connected to the first input terminal of the analog-to-digital converter, and the positive output terminal of the transimpedance amplifier is connected to the second input terminal of the analog-to-digital converter. The first end of the first feedback resistor is connected to the positive input terminal of the transimpedance amplifier, the second end of the first feedback resistor is connected to the negative output terminal of the transimpedance amplifier, the first end of the second feedback resistor is connected to the negative input terminal of the transimpedance amplifier, and the second end of the first feedback resistor is connected to the positive output terminal of the transimpedance amplifier. The first terminal of the third capacitor is connected to the first terminal of the first feedback resistor, the second terminal of the third capacitor is connected to the second terminal of the first feedback resistor, the first terminal of the fourth capacitor is connected to the first terminal of the second feedback resistor, and the second terminal of the fourth capacitor is connected to the second terminal of the second feedback resistor. The transimpedance amplifier is used to convert the induced signal into a recognition voltage; The analog-to-digital converter is used to receive the identification voltage and convert the identification voltage into the identification signal.

17. The touch device according to claim 16, characterized in that, The current conversion unit further includes: a low-pass filter; The first input terminal of the low-pass filter is connected to the negative output terminal of the transimpedance amplifier, the second input terminal of the low-pass filter is connected to the positive output terminal of the transimpedance amplifier, and the first output terminal of the low-pass filter is connected to the first input terminal of the analog-to-digital converter. The second output terminal of the low-pass filter is connected to the second input terminal of the analog-to-digital converter. The low-pass filter is used to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

18. The touch device according to claim 17, characterized in that, The current conversion unit further includes a sample-and-hold module; the sample-and-hold module includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a fifth capacitor, and a sixth capacitor; the first terminal of the ninth switch is connected to the first output terminal of the low-pass filter, the second terminal of the ninth switch is connected to both the first terminal of the fifth capacitor and the first terminal of the tenth switch, the second terminal of the tenth switch is connected to the first input terminal of the analog-to-digital converter, and the second terminal of the fifth capacitor is grounded; the first terminal of the eleventh switch is connected to the second output terminal of the low-pass filter, the second terminal of the eleventh switch is connected to both the first terminal of the sixth capacitor and the first terminal of the twelfth switch, the second terminal of the twelfth switch is connected to the second input terminal of the analog-to-digital converter, and the second terminal of the sixth capacitor is grounded; the sample-and-hold module is used to hold the identification voltage.

19. The touch device according to claim 18, characterized in that, The current conversion unit further includes: a buffer amplifier; the first input terminal of the buffer amplifier is connected to the second terminal of the tenth switch, the second input terminal of the buffer amplifier is connected to the second terminal of the twelfth switch, the first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is used to amplify the identification voltage.

20. A touch chip, characterized in that, The touch chip is used to send a first driving signal to the touch unit, and to identify the touch position based on the touch unit responding to the first driving signal and the touch unit, the finger, and the electrodes on the touch screen forming a closed loop when the finger touches the screen, by generating a sensing signal in the closed loop.

21. A display screen module, characterized in that, It includes electrodes and a touch device as described in any one of claims 1-19; the electrodes are used to form a closed loop with the touch unit and the finger when the finger touches the screen, wherein the electrodes include horizontal electrodes and / or vertical electrodes arranged on the touch screen.

22. An electronic device, characterized in that, The device includes a processor and the display screen module as described in claim 21; the processor is electrically connected to the display screen module; the processor is configured to send a switching signal to the touch device so that the touch chip in the touch device outputs a first driving signal to the touch unit or outputs a second driving signal to the electrode.

Images