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

Abstract

The embodiment of the utility model provides a touch control device, a touch control chip, a display screen module and electronic equipment, and the touch control device comprises the touch control chip which is used for sending a first driving signal to a touch control unit; the touch control unit is used for receiving the first driving signal, the touch control unit, a finger and an electrode on the touch control screen form a closed loop when the finger performs touch control, an induction signal is generated in the closed loop, and the touch control chip performs touch control position identification according to the induction signal. The touch device provided by the embodiment of the utility model can be suitable for touch position identification in an underwater scene, and the applicability is relatively high.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electrical engineering technology, and in particular to a touch control device, a touch control chip, a display screen module and an electronic device. Background Art

[0002] With the development of science and technology, the integration of electronic devices is higher, and more and more electronic devices support IP6X waterproof level. There are many scenarios that require the use of electronic devices underwater, such as: using mobile phones, touchpads and other electronic devices that need to touch the display screen underwater.

[0003] Currently, the touch control device included in the display screen of the electronic device uses electrode self-capacitance and / or mutual capacitance to identify touch control instructions.

[0004] However, since the electrode self-capacitance and / or mutual capacitance are sensitive to water when identifying touch commands, the touch commands of fingers cannot be identified when the display screen is covered with water, resulting in that existing electronic devices cannot be used underwater. Utility Model Content

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

[0006] According to a first aspect of an embodiment of the present application, a touch control device is provided, comprising: a touch control chip, the touch control chip being used to send a first drive signal to a touch control unit; the touch control unit, the touch control unit being used to receive the first drive signal, wherein when a finger touches the screen, the touch control unit, the finger, and electrodes on the touch screen form a closed loop, an induction signal is generated in the closed loop, and the touch chip identifies a touch position according to the induction signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.

[0007] In a possible implementation, when the touch control chip receives a switching signal from a processor in an electronic device, the touch control chip stops sending the first drive signal to the touch control unit, and sends a second drive signal to the electrode, and performs position recognition based on the touch control signal output by the electrode, wherein the electrode includes multiple horizontal electrodes and / or multiple vertical electrodes.

[0008] In a possible implementation, when the electronic device is in an underwater mode, the touch control chip sends a first driving signal to the touch control unit; when the electronic device is in a non-underwater mode, the touch control unit sends a second driving signal to the electrode.

[0009] In a possible implementation, 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 according to the touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes.

[0010] In a possible implementation, at least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a driving electrode and a receiving electrode, the touch chip sends the second driving signal to the driving electrode, and performs position recognition according to the touch signal output by the receiving electrode.

[0011] In a possible implementation, the touch control chip includes: a first switch and a second switch; the first switch is electrically connected to the touch control unit through a first pin of the touch control 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 opened, the touch control chip sends the first drive signal to the touch control unit through the first pin; when the first switch is opened and the second switch is closed, the touch chip sends the second drive signal to the electrode through multiple second pins of the touch chip.

[0012] In a possible implementation, the touch unit includes: a flexible circuit board; the flexible circuit board is arranged on the housing of the electronic device, the flexible circuit board is electrically connected to the first pin, and the flexible circuit board is used to receive the first drive signal. When the finger touches, the flexible circuit board, the finger and the electrode form the closed loop, and the first drive signal is transmitted in the closed loop to generate the sensing signal.

[0013] In a possible implementation manner, the flexible circuit board includes at least one of a ring-shaped flexible circuit board and a rectangular flexible circuit board.

[0014] In a possible implementation, the touch unit includes: a metal shell of the electronic device; the metal shell is electrically connected to the first pin, the metal shell of the electronic device is used to receive the first drive signal, when the finger touches, the metal shell, the finger and the electrode form the closed loop, and the first drive signal is transmitted in the closed loop to generate the sensing signal.

[0015] In a possible implementation, the touch control device also includes: a signal amplifying module; an input end of the signal amplifying module is connected to the first pin, and an output end of the signal amplifying module is connected to the touch control unit; the signal amplifying module is used to perform level amplification processing on the first drive signal, and send the amplified first drive signal to the touch control unit, so that the touch control unit transmits the amplified first drive signal in the closed loop.

[0016] In a possible implementation, the touch control unit includes: a level conversion unit; an input pin of the level conversion unit is electrically connected to a third pin of the touch control chip, and a first output pin of the level conversion unit is electrically connected to a ground pin of the touch control chip; the touch chip sends the first drive signal to the level conversion unit through the third pin, and the level conversion unit generates a square wave signal according to the first drive signal, and sends the square wave signal to the touch chip through the ground pin; when the finger performs touching, the finger, the electrode and the ground pin form a closed loop, so that the closed loop generates the sensing signal.

[0017] In a possible implementation, the second output pin of the level conversion unit is connected to the power supply pin of the touch control chip; the level conversion unit is used to transmit a power supply voltage to the touch control 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 control chip.

[0018] In a 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 end of the third switch is connected to the power supply, the second end of the third switch is connected to the second output pin, the first end of the first capacitor is connected to the second output pin, the second end of the first capacitor is connected to the first end of the fourth switch and the first output pin respectively, and the second end 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 end of the fifth switch is connected to the power supply, the second end of the fifth switch is connected to the first end of the sixth switch, the second end of the sixth switch is connected to the second end of the capacitor in the i-1-th sub-circuit, the first end of the second capacitor is connected to the second end of the fifth switch, and the second capacitor The second end of is connected to the first end of the seventh switch, and the second end of the seventh switch is grounded, wherein i is an integer greater than 1 and less than N; the Nth subcircuit of the N subcircuits includes an eighth switch, the first end of the eighth switch is connected to the power supply, and the second end of the eighth switch is connected to the second end of the capacitor in the N-1th subcircuit; the level conversion unit is used to control the on-off of the switches in the N subcircuits 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, the low level of the square wave signal is generated at the first output pin, when the eighth switch is closed, the high level of the square wave signal is generated at the first output pin, and the output voltage of the power supply is equal to the supply voltage of the touch chip.

[0019] In a possible implementation, 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 end of the thirteenth switch is connected to the power supply, the second end of the thirteenth switch is connected to the second output pin, the first end of the seventh capacitor is connected to the second output pin, the second end of the seventh capacitor is connected to the first end of the fourteenth switch and the first output pin respectively, and the second end of the fourteenth switch is grounded; the input end of the DC voltage conversion unit is connected to the power supply, the output end of the DC voltage conversion unit is connected to the first end of the fifteenth switch, the second end of the fifteenth switch is connected to the first end of the fourteenth switch, and the second end of the fifteenth switch is connected to the first end of the fourteenth switch. The second end of the seventh capacitor is connected; the DC voltage conversion unit is used to step up or step down the output voltage of the power supply; the level conversion unit is used to control the on and off of the thirteenth switch, the fourteenth switch and the fifteenth switch according to the first drive signal, so that the on and off states of the thirteenth switch and the fourteenth switch are the same, and the on and off states of the thirteenth switch and the fifteenth switch are opposite, when the thirteenth switch is closed, the low level of the square wave signal is generated at the first output pin, when the fifteenth switch is closed, the high level of the square wave signal is generated at the first output pin, and the output voltage of the power supply is equal to the supply voltage of the touch chip.

[0020] In a 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 according to the sensing signal; and the processing unit is used to identify the touch position according to the identification signal.

[0021] In a 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; the first end of the first resistor is connected to the output end of the electrode, the second end of the first resistor is connected to the positive input end of the transimpedance amplifier, the first end of the second resistor is connected to a reference voltage, the second end of the second resistor is connected to the negative input end of the transimpedance amplifier, the negative output end of the transimpedance amplifier is connected to the first input end of the analog-to-digital converter, and the positive output end of the transimpedance amplifier is connected to the second input end of the analog-to-digital converter; the first end of the first feedback resistor is connected to the positive input end of the transimpedance amplifier, The second end of the first feedback resistor is connected to the negative output end of the transimpedance amplifier, the first end of the second feedback resistor is connected to the negative input end of the transimpedance amplifier, and the second end of the first feedback resistor is connected to the positive output end 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 sensing 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.

[0022] In one possible implementation, the current conversion unit also includes: a low-pass filter; a first input end of the low-pass filter is connected to the negative output end of the transimpedance amplifier, a second input end of the low-pass filter is connected to the positive output end of the transimpedance amplifier, a first output end of the low-pass filter is connected to the first input end of the analog-to-digital converter, and a second output end of the low-pass filter is connected to the second input end of the analog-to-digital converter; the low-pass filter is used to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

[0023] In a possible implementation, the current conversion unit further includes: a sampling and holding module; the sampling and holding module includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a fifth capacitor and a sixth capacitor; the first end of the ninth switch is connected to the first output end of the low-pass filter, the second end of the ninth switch is simultaneously connected to the first end of the fifth capacitor and the first end of the tenth switch, the second end of the tenth switch is connected to the first input end of the analog-to-digital converter, and the second end of the fifth capacitor is grounded; the first end of the eleventh switch is connected to the second output end of the low-pass filter, the second end of the eleventh switch is simultaneously connected to the first end of the sixth capacitor and the first end of the twelfth switch, the second end of the twelfth switch is connected to the second input end of the analog-to-digital converter, and the second end of the sixth capacitor is grounded; the sampling and holding module is used to hold the identification voltage.

[0024] In a possible implementation, the current conversion unit further includes: a buffer amplifier; a first input terminal of the buffer amplifier is connected to the second terminal of the tenth switch, a second input terminal of the buffer amplifier is connected to the second terminal of the twelfth switch, a first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and a second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is used to perform signal amplification processing on the identification voltage.

[0025] According to a second aspect of an embodiment of the present application, a touch control chip is provided, which is used to send a first drive signal to a touch control unit, and to identify the touch position based on an induction signal generated in the closed loop after the touch control unit responds to the first drive signal and the touch control unit, the finger, and electrodes on the touch screen form a closed loop when a finger touches the screen.

[0026] According to a third aspect of an embodiment of the present application, a display screen module is provided, comprising a touch device and an electrode as described in the first aspect of the embodiment of the present application, wherein the electrode is used to form a closed loop with the touch unit and the finger when the finger touches, wherein the electrode comprises horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0027] According to the fourth aspect of the embodiments of the present application, an electronic device is provided, comprising a processor and the display screen module described in the second aspect of the embodiments of the present application; the processor is electrically connected to the display screen module; the processor is used to send a switching signal to the touch control device so that the touch control chip in the touch control device outputs a first drive signal to the touch control unit or outputs a second drive signal to the electrode.

[0028] According to the touch device provided by the embodiment of the present application, the touch device includes a touch chip and a touch unit. The touch chip sends a first drive signal to the touch unit. When a finger touches the touch unit, the touch unit, the finger and the electrode form a closed loop. At this time, after the touch unit receives the first drive signal, an induction signal is generated in the closed loop, so that the touch chip can identify the touch position according to the induction signal. Since a changing signal is generated according to the difference between the equivalent capacitance between water and the touch unit, and between water and the electrode and the equivalent capacitance between the finger and the touch unit, and between the finger and the electrode, the generation of the induction signal is realized. Therefore, compared with the touch position identification through electrode self-capacitance or mutual capacitance in the prior art, the touch device can be suitable for touch position identification in an underwater environment. Therefore, the touch device can be suitable for touch position identification in a variety of usage scenarios, and has high applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0030] Figure 1 is a schematic diagram of a touch control device provided in an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of a touch control device in a normal mode provided by an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of a touch control chip provided in an embodiment of the present application;

[0033] Figure 4 is a schematic diagram of a touch unit provided in an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of an equivalent circuit of a closed loop provided in an embodiment of the present application;

[0035] Figure 6 is a schematic diagram of a flexible circuit board provided in an embodiment of the present application;

[0036] Figure 7 is a schematic diagram of another touch unit provided in an embodiment of the present application;

[0037] Figure 8 is a schematic diagram of another equivalent circuit of a closed loop provided in an embodiment of the present application;

[0038] Fig. 9is a schematic diagram of a touch control device including a signal amplification module provided in an embodiment of the present application;

[0039] Fig.10 is a schematic diagram of another touch unit provided in an embodiment of the present application;

[0040] Fig.11 is a schematic diagram of another equivalent circuit of a closed loop provided in an embodiment of the present application;

[0041] Fig.12 is a schematic diagram of a level conversion unit provided in an embodiment of the present application;

[0042] Fig.13 is a circuit diagram of a level conversion unit provided in an embodiment of the present application;

[0043] Fig.14 is a schematic diagram of an example of a level conversion unit provided in an embodiment of the present application;

[0044] Fig.15 is a schematic diagram of another example of a level conversion unit provided in an embodiment of the present application;

[0045] Fig.16 is a schematic diagram of an output voltage timing provided by an embodiment of the present application;

[0046] Fig.17 is a circuit diagram of another level conversion unit provided in an embodiment of the present application;

[0047] Fig.18 is a schematic diagram of another touch chip provided in an embodiment of the present application;

[0048] Fig.19 is a circuit diagram of a current conversion unit provided in an embodiment of the present application;

[0049] Fig. 20 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0050] Fig.21 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0051] Fig. 22 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0052] Fig.23 is a schematic diagram of a display screen module provided in an embodiment of the present application;

[0053] Fig.24 is a schematic diagram of an electronic device provided in an embodiment of the present application;

[0054] Fig.25 This is a rendering of a touch position recognition provided by an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and in detail below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0056] As mentioned above, with the development of science and technology, the integration of electronic devices is higher, and more and more electronic devices support IP6X waterproof level. There are many scenarios that require the use of electronic devices underwater, such as: using mobile phones, touchpads and other electronic devices that need to touch the display screen underwater. At present, the touch device included in the display screen of the electronic device uses electrode self-capacitance and / or mutual capacitance to identify touch commands. However, since the electrode self-capacitance and / or mutual capacitance are more sensitive to water when identifying touch commands, when the display screen is covered with water, the touch command of the finger cannot be recognized, resulting in the existing electronic equipment being unable to be used underwater.

[0057] A touch device is provided in an embodiment of the present application. The touch device includes a touch chip and a touch unit. The touch chip sends a first drive signal to the touch unit. When a finger touches the touch unit, the touch unit, the finger and the electrode form a closed loop. At this time, after the touch unit receives the first drive signal, an induction signal is generated in the closed loop. Therefore, the touch chip can identify the touch position according to the induction signal. Since a changing signal is generated according to the difference between the equivalent capacitance between water and the touch unit, and between water and the electrode, and the equivalent capacitance between the finger and the touch unit, and between the finger and the electrode, the generation of the induction signal is realized. Therefore, compared with the electrode self-capacitance or mutual capacitance in the prior art, the touch device can be suitable for touch position recognition in an underwater environment. Therefore, the touch device can be suitable for touch position recognition in a variety of usage scenarios, and has high applicability.

[0058] The touch control device provided by the present application is described below through embodiments.

[0059] Figure 1 is a schematic diagram of a touch device provided in an embodiment of the present application, such as Figure 1As shown, the touch control device 100 includes a touch control chip 101 and a touch control unit 102. The touch control chip 101 can send a first drive signal to the touch control unit 102, and the touch control unit 102 can receive the first drive signal. When a finger touches the screen, the touch control unit 102, the finger, and the electrode 401 on the touch screen form a closed loop, and a sensing signal is generated in the closed loop. The touch chip 101 identifies the touch position according to the sensing signal. The electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.

[0060] The touch control device 100 includes a touch control chip 101 and a touch control unit 102. The touch control chip 101 and the touch control unit 102 are electrically connected. The touch control chip 101 can send a first drive signal to the touch control unit 102. In an example, the first drive signal can be a voltage signal. The first drive signal can be a sine wave waveform signal, a square wave waveform signal, a trapezoidal wave waveform signal, etc.

[0061] When a finger touches the touch screen, the finger, the touch unit 102 and the electrode 401 form a closed loop. Specifically, there is an equivalent capacitance between the finger and the touch unit 102, and there is an equivalent capacitance between the finger and the electrode 401. Thus, the touch unit 102, the equivalent capacitance between the finger and the touch unit 102, the equivalent capacitance between the finger, the finger and the electrode 401, and the electrode 401 form a closed loop. Since the touch unit 102 receives the first drive signal, an induction signal can be generated in the closed loop. Specifically, when in an underwater environment, there is an equivalent capacitance between the water and the touch unit 102, and between the water and the electrode 401, so the touch unit 102, the water and the electrode 401 form a closed loop. When a finger touches, since the equivalent capacitance between the water and the touch unit 102, and between the water and the electrode 401 is different 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 to form an induction signal. The electrodes can be multiple horizontal electrodes and / or multiple vertical electrodes distributed on the touch screen.

[0062] 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 according to the sensing signal. In one example, the touch chip 101 can convert the sensing signal into a digital signal and then send the digital signal to the processor of the electronic device, thereby realizing touch position recognition.

[0063] In the embodiment of the present application, the touch chip 101 sends a first drive signal to the touch unit 102. When a finger touches the touch unit 102, the touch unit 102, the finger and the electrode 401 form a closed loop. At this time, after the touch unit 102 receives the first drive signal, an induction signal is generated in the closed loop, so that the touch chip 101 can identify the touch position according to the induction signal. Since a changing signal is generated according to 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, the generation of the induction signal is realized. Therefore, compared with the touch position identification through the self-capacitance or mutual capacitance of the electrode 401 in the prior art, the touch device 100 can be suitable for touch position identification in an underwater environment. Therefore, the touch device 100 can be suitable for touch position identification in a variety of usage scenarios, and has high applicability.

[0064] Figure 2 is a schematic diagram of a touch device in a normal mode provided by an embodiment of the present application, such as Figure 2 As shown, when the touch control chip 101 receives a switching signal from a processor in an electronic device, the touch control chip 101 stops sending a first driving signal to the touch control unit 102, and the touch control chip 101 sends a second driving signal to the electrode 401, and performs position recognition according to the touch control signal output by the electrode 401, wherein the electrode 401 includes a plurality of horizontal electrodes and / or a plurality of vertical electrodes.

[0065] When the touch chip 101 receives the switching signal sent by the processor, it switches from the underwater touch mode to the normal touch mode, and the touch chip 101 stops sending the first drive signal to the touch unit 102, and then the touch chip 101 outputs the second drive signal to the electrode 401. The second drive signal can be a sine wave waveform signal, a square wave waveform signal, or a trapezoidal wave waveform signal, etc. When the electrode 401 receives the second drive signal, it generates a sensing signal, and the touch chip 101 identifies the touch position according to the sensing signal.

[0066] It should be understood that Figure 2 As shown, the multiple electrodes 401 include horizontal electrodes and / or multiple vertical electrodes, and the touch control chip 101 is electrically connected to each electrode 401. When the multiple horizontal electrodes and / or the multiple vertical electrodes generate sensing signals, the touch control chip 101 can detect the sensing signals generated in the multiple horizontal electrodes and / or the multiple vertical electrodes.

[0067] In the embodiment of the present application, when the touch chip 101 receives a switching signal, it stops outputting the first drive signal to the touch unit 102 and outputs the second drive signal to the electrode 401, thereby being suitable for touch position recognition in daily use scenarios. Since the conventional touch mode and the underwater touch mode are switched according to the switching signal, it can be suitable for touch position recognition in daily scenes and underwater scenes, and can be suitable for touch position recognition in a variety of usage scenarios, with high applicability.

[0068] In a possible implementation, when the electronic device is in the underwater mode, the touch control chip 101 sends a first driving signal to the touch control unit 102 , and when the electronic device is in the non-underwater mode, the touch control unit 101 sends a second driving signal to the electrode 401 .

[0069] When the electronic device is in underwater mode, the touch control unit 102 receives the first driving signal, and there is an equivalent capacitance between the water and the touch control unit 102, and between the water and the electrode 401. Therefore, the touch control unit 102, the water and the electrode 401 form a closed loop, and a signal is generated at the electrode 401. When a finger touches, since the equivalent capacitance between the water and the touch control unit 102, and between the water and the electrode 401 is different from the equivalent capacitance between the finger and the touch control unit 102, and between the finger and the electrode 401, the signal in the electrode 401 changes, forming an induction signal.

[0070] When the electronic device is in the non-underwater mode, the touch chip 101 stops sending the first drive signal to the touch unit 102, and then the touch chip 101 outputs a second drive signal to the electrode 401. The second drive signal can be a sine wave signal, a square wave signal, or a trapezoidal wave signal, etc. When the electrode 401 receives the second drive signal, it generates a sensing signal, and the touch chip 101 identifies the touch position according to the sensing signal.

[0071] In one example, the underwater mode and the non-underwater mode can be switched by clicking a mode switching button displayed on the display screen of the electronic device. Specifically, after clicking the mode switching button displayed on the display screen, the processor of the electronic device sends a switching signal to the touch chip 101 to achieve switching between the underwater mode and the non-underwater mode.

[0072] In an embodiment of the present application, when the electronic device is in the underwater mode, the touch chip 101 sends a first drive signal to the touch unit 102, and when the electronic device is in the non-underwater mode, the touch unit 101 sends a second drive signal to the electrode 401, so that the electronic device can switch between the underwater mode and the non-underwater mode. Therefore, the touch device can be suitable for touch position recognition in daily scenes and underwater scenes, and can be suitable for touch position recognition in a variety of usage scenarios, and has high applicability.

[0073] In a possible implementation, the touch chip 101 sends a second driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and performs position recognition according to a touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes.

[0074] One of the multiple horizontal electrodes and the multiple vertical electrodes is used as a driving electrode, and the touch chip 101 outputs a driving signal to the driving electrode. The other of the multiple horizontal electrodes and the multiple vertical electrodes is used as a receiving electrode to output a sensing signal. The touch chip 101 performs touch recognition according to the sensing signal and can identify the touch position of the finger. This method is a mutual capacitance detection method.

[0075] In addition, in another possible implementation, the self-capacitance detection method can be superimposed to identify the touch position of the finger, and at least one of the multiple horizontal electrodes and the multiple vertical electrodes is used 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 according to the sensing signal output by the receiving electrode. For example, the touch chip 101 outputs a driving signal to the multiple horizontal electrodes (driving electrodes) and receives the sensing signal output by the multiple horizontal electrodes (receiving electrodes), or the touch chip 101 outputs a driving signal to the multiple vertical electrodes (driving electrodes) and receives the sensing signal output by the multiple vertical electrodes (receiving electrodes), or the touch chip 101 simultaneously outputs a driving signal to the multiple horizontal electrodes and the multiple vertical electrodes and simultaneously receives the sensing signal output by the multiple horizontal electrodes and the multiple vertical electrodes, and the touch chip 101 identifies the touch position according to the received sensing signal.

[0076] In the embodiment of the present application, when the touch control chip 101 receives the switching signal, it stops outputting the first driving signal to the touch control unit 102 and outputs the second driving signal to the electrode 401, thereby enabling touch position identification to be performed by self-capacitance or mutual capacitance through the electrode 401, and can be applicable to touch position identification in daily use scenarios. Since daily scenes and underwater scenes are switched according to the switching signal, touch position identification can be applicable to daily scenes and underwater scenes. The touch control device 100 can be applicable to touch position identification in a variety of usage scenarios, and has high applicability.

[0077] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of the present application, such as Figure 3As shown, 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 a 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 disconnected, the touch chip 101 sends a first drive signal to the touch unit 102 through the first pin 1012. When the first switch K1 is disconnected and the second switch K2 is closed, the touch chip 101 sends a second drive signal to the electrode 401 through multiple second pins of the touch chip 101.

[0078] The touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is arranged 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 opened, the signal generator 1011 in the touch chip 101 generates a first drive signal and transmits the first drive signal to the first pin 1012 through the closed first switch K1. The first pin 1012 sends the first drive signal to the touch unit 102 electrically connected to the first pin 1012, so that touch position recognition can be performed in an underwater scene.

[0079] 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 electricity to the ground wire, the first switch K1 will be disconnected at this time. 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 scenes.

[0080] In the embodiment of the present application, the touch chip 101 includes a first switch K1 and a second switch K2. When the first switch K1 is closed and the second switch K2 is disconnected, the touch chip 101 sends a first drive signal to the touch unit 102 through the first pin 1012. When the first switch K1 is disconnected and the second switch K2 is closed, the touch chip 101 sends a second drive signal to the electrode 401 through multiple second pins, thereby realizing switching between an underwater touch recognition mode and a daily touch recognition mode. Since the touch chip 101 can control the on and off of the first switch K1 and the second switch K2 according to the switching signal sent by the processor, it can be used for touch position recognition in daily scenes and underwater scenes. The touch device 100 can be used for touch position recognition in a variety of usage scenarios and has high applicability.

[0081] Figure 4 is a schematic diagram of a touch unit provided in an embodiment of the present application, such as Figure 4 As shown, the touch unit 102 includes a flexible circuit board 501, which is arranged 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 drive signal. When the finger 300 performs touch control, the flexible circuit board 501 forms a closed loop with the finger 300 and the electrode 401, and transmits the first drive signal in the closed loop to generate a sensing signal.

[0082] The touch unit 102 includes a flexible circuit board 501, which can be arranged on the housing 201 of the electronic device. In one example, the flexible circuit board 501 can be bonded to the back cover of the electronic device. In another example, the flexible circuit board 501 can be bonded to the middle frame of the electronic device. The flexible circuit board 501 is electrically connected to the first pin 1012 of the touch chip 101, and the flexible circuit board 501 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 flexible circuit board 501 and water, and between 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.

[0083] Figure 5 is a schematic diagram of an equivalent circuit of a closed loop provided in an embodiment of the present application, such as Figure 5 As shown, when the finger 300 performs touch control, the flexible circuit board 501, the finger 300 and the electrode 401 form a closed loop. The electrode 401 can be a horizontal electrode and / or a vertical electrode. Figure 5The 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, that is, the sensing signal is generated, and the electrode 401 sends the sensing signal to the touch chip 101 through the pin of the touch chip 101, and the touch chip 101 identifies the touch position according to the sensing signal.

[0084] In one example, when the touch chip 101 identifies the touch position according to 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, or it can first detect the X-axis coordinate and then detect the Y-axis coordinate. In another example, the touch chip 101 can simultaneously detect the sensing signals generated by the horizontal electrodes and the vertical electrodes to directly obtain the X-axis coordinate and the Y-axis coordinate of the touch position. In another example, the touch chip 101 can only detect the sensing signals generated by the horizontal electrodes or the vertical electrodes, that is, only detect the X-axis coordinate or the Y-axis coordinate of the touch position, which can be suitable for scenarios with lower requirements on detection accuracy. The specific detection method can be set as needed and is not limited here.

[0085] In the embodiment of the present application, the touch unit 102 includes a flexible circuit board 501, which is arranged on the housing 201 of the electronic device. When the finger 300 performs touch control, the flexible circuit board 501 forms a closed loop with the finger 300 and the electrode 401, and transmits a first drive signal in the closed loop to generate a sensing signal, thereby realizing touch position recognition underwater. Since the touch unit 102 is a flexible circuit board 501, it can be arranged on an electronic device with a plastic housing, a glass housing and a metal housing, and can be applicable to electronic devices of various materials. 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, a changing signal is generated to realize the generation of the sensing signal. Compared with the self-capacitance or mutual capacitance scheme in the prior art that can only perform touch recognition in daily scenes, the touch device 100 can be applicable to touch recognition in an underwater environment. Therefore, the touch device 100 can be applicable to touch recognition in a variety of usage scenarios, and has high applicability.

[0086] In a possible implementation, the flexible circuit board 501 includes at least one of a ring-shaped flexible circuit board 501 and a rectangular-shaped flexible circuit board 501 .

[0087] Figure 6 is a schematic diagram of a flexible circuit board provided in an embodiment of the present application, such as Figure 6 As shown, the flexible circuit board 501 may include a rectangular flexible circuit board 501 and a ring-shaped flexible circuit board 501. It should be understood that Figure 6 As shown, a plurality of rectangular flexible circuit boards 501 may be disposed on at least one of the four sides of the housing of the electronic device.

[0088] Specifically, Fig.16 (a) in the figure shows a schematic diagram of setting a rectangular flexible circuit board 501 at the center of the electronic device housing. Fig.16 (b) shows a schematic diagram of setting the ring-shaped flexible circuit board 501 in the housing of the electronic device. Fig.16 (c) in FIG. 1 shows a schematic diagram of connecting three rectangular flexible circuit boards 501 and setting them on three sides of the housing of an electronic device. Fig.16 (d) and Fig.16 (e) in the figure shows a schematic diagram of arranging two rectangular flexible circuit boards 501 on the upper and lower sides or the left and right sides of the housing of the electronic device.

[0089] In an example, the flexible circuit board 501 may 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.

[0090] In the embodiment of the present application, the flexible circuit board 501 includes at least one of a ring-shaped flexible circuit board 501 and a rectangular flexible circuit board 501, thereby enabling the circuit board to be set on the housing of an electronic device. The flexible circuit board 501 is set in a ring shape and a rectangular shape to form a closed loop with fingers from all directions and the electrode 401, and can identify the touch position of the finger when touching in all directions underwater, and has high applicability.

[0091] Figure 7 is a schematic diagram of another touch unit provided in an embodiment of the present application, such as Figure 7 As shown, the touch unit 102 includes: a metal shell 202 of an electronic device, the metal shell 202 is electrically connected to the first pin 1012, and the metal shell 202 of the electronic device is used to receive a first drive signal. When a finger touches, the metal shell 202 forms a closed loop with the finger and the electrode 401, and transmits the first drive signal in the closed loop to generate an induction signal.

[0092] Since metal can conduct electricity, the touch unit 102 can be a metal shell 202 of an electronic device. The metal shell 202 is electrically connected to the first pin 1012 of the touch chip 101, and the metal shell 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 shell 202 and water, and between water and the electrode 401, forming a closed loop, and since the metal shell 202 receives the first drive signal sent by the touch chip 101, a signal can be generated in the closed loop.

[0093] Figure 8 is a schematic diagram of another closed loop equivalent circuit provided in an embodiment of the present application, such as Figure 8 As shown, when the finger 300 performs touch control, the metal housing 202, the finger 300 and the electrode 401 form a closed loop. The electrode 401 can be a horizontal electrode and / or a vertical electrode. 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, the sensing signal is generated, and the electrode 401 sends the sensing signal to the touch chip 101 through the pin of the touch chip 101, and the touch chip 101 identifies the touch position according to the sensing signal.

[0094] In one example, when the touch chip 101 identifies the touch position according to 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, or it can first detect the X-axis coordinate and then detect the Y-axis coordinate. In another example, the touch chip 101 can simultaneously detect the sensing signals generated by the horizontal electrodes and the vertical electrodes to directly obtain the X-axis coordinate and the Y-axis coordinate of the touch position. In another example, the touch chip 101 can only detect the sensing signals generated by the horizontal electrodes or the vertical electrodes, that is, only detect the X-axis coordinate or the Y-axis coordinate of the touch position, which can be suitable for scenarios with lower requirements on detection accuracy. The specific detection method can be set as needed and is not limited here.

[0095] In the embodiment of the present application, the touch unit 102 includes a metal shell 202 of an electronic device. When the finger 300 performs touch control, the metal shell 202 forms a closed loop with the finger 300 and the electrode 401, and transmits a first drive signal in the closed loop to generate a sensing signal, thereby realizing touch position recognition underwater. Since the touch unit 102 is the metal shell 202 of the electronic device, the electronic device with the metal shell 202 does not need to be additionally provided with a touch unit 102, and the cost is low. Moreover, since a signal that changes according to the difference between the equivalent capacitance between water and the metal shell 202, and between water and the electrode 401 and the equivalent capacitance between the finger 300 and the metal shell 202, and between the finger 300 and the electrode 401 is generated, the sensing signal is generated. Compared with the touch position recognition through the self-capacitance or mutual capacitance of the electrode 401 in the prior art, the touch device 100 can be applicable to touch position recognition in an underwater environment. Therefore, the touch device 100 can be applicable to touch recognition in a variety of usage scenarios, and has high applicability.

[0096] Fig. 9 is a schematic diagram of a touch control device including a signal amplification module provided in an embodiment of the present application, such as Fig. 9 As shown, the touch control device 100 also includes: a signal amplifying module 103, the input end of the signal amplifying module 103 is connected to the first pin 1012, the output end of the signal amplifying module 103 is connected to the touch control unit 102, and the signal amplifying module 103 is used to perform level amplification processing on the first drive signal and send the amplified first drive signal to the touch control unit 102, so that the touch control unit 102 transmits the amplified first drive signal in a closed loop.

[0097] The signal amplification module 103 can perform signal amplification processing on the first drive signal output by the touch chip 101. The input end of the signal amplification module 103 receives the first drive signal sent by the touch chip 101 through the first pin 1012, then performs signal amplification processing on the first drive signal, and sends the amplified first drive signal to the touch unit 102, thereby enabling the touch unit 102 to generate a sensing signal based on the amplified first drive signal.

[0098] In one example, the difference range between the peak and the trough of the first drive signal before signal amplification is [1Vpp, 10Vpp], that is, the difference range is between 1Vpp-10Vpp; the difference range between the peak and the trough of the first drive signal after signal amplification processing is [1Vpp, 30Vpp], that is, the difference range is between 1Vpp-30Vpp.

[0099] In the embodiment of the present application, the touch control device 100 also includes a signal amplification module 103, which can perform signal amplification processing on the first drive signal output by the touch control chip 101, so that the signal amplitude of the first drive signal can be increased, thereby transmitting the first drive signal with a large signal amplitude in a closed loop, and the signal amplitude of the generated sensing signal is large, thereby improving the sensitivity of the touch control device 100 to identify the touch position.

[0100] Fig.10 is a schematic diagram of another touch unit provided in an embodiment of the present application, such as Fig.10 As shown, the touch control unit 102 includes a level conversion unit 104, an input pin 1041 of the level conversion unit 104 is electrically connected to the third pin 1013 of the touch control chip 101, and a first output pin 1042 of the level conversion unit 104 is electrically connected to the ground pin 1014 of the touch control chip 101. The touch control chip 101 sends a first drive 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 drive signal, and sends the square wave signal to the touch control chip 101 through the ground pin 1014. When a finger touches, the finger, the electrode 401 and the ground pin 1014 form a closed loop, so that the closed loop generates an induction signal.

[0101] The level conversion unit 104 can receive the first driving signal output by the touch chip 101 through the third pin 1013 through the input pin 1041. In an example, the first driving signal can be a Sync synchronization signal between the touch chip 101 and the level conversion unit 104, and the Sync synchronization signal is a square wave signal. After receiving the first driving signal, the level conversion unit 104 generates a square wave signal according to the first driving signal.

[0102] 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, a closed loop is formed between the finger, the electrode 401 and the ground pin 1014 of the touch chip 101. Fig.11 is a schematic diagram of another closed loop equivalent circuit provided in an embodiment of the present application, such as Fig.11 As shown, the finger 300 is equivalent to being grounded through the capacitor CHM3, and there is an equivalent capacitor CHT3 between the finger 300 and the electrode 401. Fig.11 The equivalent signal source L2 in is the square wave signal on the ground pin. It should be understood that since the square wave signal has high level and low level, it is equivalent to generating high level and low level driving signals on the finger 300, so that when the finger 300 touches, an induction signal can be generated in the closed loop.

[0103] In one example, Fig.12is a schematic diagram of a level conversion unit provided in an embodiment of the present application, such as Fig.12 As shown, the level conversion unit 104 may include a communication unit 1044, and the communication unit 1044 may be electrically connected to the communication pin in the touch chip 101, for example, electrically connected to the SPI pin in the touch chip, and the touch chip 101 may communicate with the level conversion unit 104 through the communication pin, and perform operations such as setting the level conversion unit 104, and the communication unit 1044 may step down the communication signal output by the touch chip 101 and send it to the processor in the electronic device, for example, step down the touch position coordinate signal output by the touch chip 101 and 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 sends the square wave signal to the ground pin 1014 of the touch chip 101, Therefore, the reference voltage of the ground pin 1014 of the touch chip 101 is not the 0V of the ground line, but a square wave signal. When the square wave signal is at a high level, the voltage of the communication signal generated by the touch chip 101 based on the reference voltage of the ground pin 1014 is higher. 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 and send it to the processor. For example, the communication signal of 13V is reduced to a communication signal of 3V to prevent the processor from being damaged by high voltage.

[0104] In the embodiment of the present application, the touch unit 102 includes a level conversion unit 104, which generates a square wave signal after receiving the first drive signal. Therefore, when the finger 300 performs touch control, the finger 300, the electrode 401 and the ground pin 1014 form a closed loop, and 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, so that the touch chip 101 can identify the touch position according to the sensing signal, thereby realizing touch position recognition in an underwater scene. Since a changing signal is generated according to the different equivalent capacitances between water and the finger 300 and the electrode 401, the generation of the sensing signal is realized. Compared with the self-capacitance or mutual capacitance schemes in the prior art that can only perform touch recognition in daily scenes, the touch device 100 can be suitable for touch recognition in an underwater environment. Therefore, the touch device 100 can be suitable for touch recognition in a variety of usage scenarios, and has high applicability.

[0105] In one possible implementation, Fig.10As shown, the second output pin 1043 of the level conversion unit 104 is connected to the power supply pin 1015 of the touch control chip 101. The level conversion unit 104 can transmit the power supply voltage to the touch control 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 control chip 101.

[0106] 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, and 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.

[0107] 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 of 0V, the power supply voltage is 3V, and when the square wave signal is a high-level signal of 12V, the power supply voltage is 15V. The voltage difference between the power supply voltage and the square wave signal is constant at 3V.

[0108] In the embodiment of the present application, the level conversion unit 104 can transmit the power supply voltage to the touch chip 101 through the power supply pin 1015, so that 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, the power supply voltage of the touch chip 101 remains unchanged, thereby ensuring the stable power supply of the touch chip 101 and allowing the touch chip 101 to work normally.

[0109] Fig.13 is a circuit diagram of a level conversion unit provided in an embodiment of the present application, such as Fig.13 As shown, 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, 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, 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, and the second end of the fourth switch K4 is grounded.

[0110] The i-th subcircuit among the N subcircuits includes a fifth switch K5, a sixth switch K6, a seventh switch K7, and a second capacitor C2, a first end of the fifth switch K5 is connected to a power supply AVDD, a second end of the fifth switch K5 is connected to a first end of the sixth switch K6, a second end of the sixth switch K6 is connected to a second end of a capacitor in the (i-1)-th subcircuit, a first end of the second capacitor C2 is connected to a second end of the fifth switch K5, a second end of the second capacitor C2 is connected to a first end of a seventh switch K7, and a second end of the seventh switch K7 is grounded, wherein i is an integer greater than 1 and less than N.

[0111] The Nth subcircuit of the N subcircuits includes an eighth switch K8, a first end of the eighth switch K8 is connected to the power supply AVDD, and a second end of the eighth switch K8 is connected to the second end of the capacitor in the N-1th subcircuit;

[0112] The level conversion unit 104 is used to control the on and off of the switches in the N sub-circuits according to the first driving signal, so that the on and 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 and off states of the sixth switch K6 and the eighth switch K8 are the same, and the on and 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 the square wave signal is generated at the first output pin 1042, when the eighth switch K8 is closed, a high level of the square wave signal is generated at the first output pin 1042, and the output voltage of the power supply AVDD is equal to the supply voltage of the touch chip 101.

[0113] The level conversion unit 104 controls the on and off of switches in the N sub-circuits according to the first driving signal. In one example, when the first driving 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 opened. At this time, the capacitors in the circuit are charged by the power supply AVDD. When the first 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 opened, and the sixth switch K6 and the eighth switch K8 are closed. Each capacitor and the power supply AVDD jointly output a 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 first output pin 1042 and the second output pin 1043 have a constant phase difference of the voltage output by the first capacitor C1.

[0114] The following description will be made by taking the output voltage of the power supply AVDD as 3V and taking N=2 and N=3 as examples.

[0115] Fig.14 is a schematic diagram of an example of a level conversion unit provided in an embodiment of the present application, such as Fig.14As shown, when N = 2, there are only the first subcircuit and the second subcircuit, as Fig.14 As shown in (a) of FIG. 1 , when the first driving signal is at the first level, the third switch K3 and the fourth switch K4 are closed, and the eighth switch K8 is opened. 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 a voltage of 0V, 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. Fig.14 As shown in (b), when the first driving signal is at the second level, the third switch K3 and the fourth switch K4 are disconnected, and the eighth switch K8 is closed. The power supply AVDD connected to the eighth switch K8 and the first capacitor C1 together output an output 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 an output voltage of 3V which is once the power supply AVDD to the first output pin 1042. The voltage difference between the first output pin 1042 and the second output pin 1043 is 3V, which supplies power to 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.

[0116] Fig.15 is a schematic diagram of another example of a level conversion unit provided in an embodiment of the present application, such as Fig.15 As shown, when N=3, there are the first subcircuit, the second subcircuit and the third subcircuit, as shown in Fig.15 As shown in (a) in FIG. 1 , when the first driving 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 opened. At this time, the power supply AVDD charges the first capacitor C1 and the second capacitor C2, and 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 3V of the power supply AVDD connected to the third switch K3. Fig.15 As shown in (b), when the first 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 disconnected, and the sixth switch K6 and the eighth switch K8 are closed. The power supply AVDD, the first capacitor C1 and the second capacitor C2 connected to the eighth switch K8 together output a voltage of 9V, which is three times the output voltage of the power supply AVDD, to the second output pin 1043. The power supply AVDD and the second capacitor C2 connected to the eighth switch K8 together output a voltage of 6V, which is twice the output voltage of the power supply AVDD, to the first output pin 1042. The voltage difference between the first output pin 1042 and the second output pin 1043 is 3V, which supplies power to 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.

[0117] Fig.16 is a schematic diagram of an output voltage timing provided by an embodiment of the present application, such as Fig.16 As shown, when the first drive signal is at a low level, the second output pin 1043 outputs the AVDD output voltage, and the first output pin 1042 outputs a 0V voltage. When the first drive signal is at a high level, 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.

[0118] In the embodiment of the present application, the on-off of switches in N sub-circuits is controlled to realize that the first output pin 1042 of the level conversion unit outputs a square wave signal, and the second output pin 1043 outputs a power supply AVDD voltage whose output voltage difference with the first output pin 1042 is a constant value, thereby realizing the generation of a square wave signal and realizing constant voltage power supply to the touch chip 101, thereby transmitting the square wave signal in a closed loop, and performing touch position recognition on the sensing signal through the touch chip 101.

[0119] Fig.17 is a circuit diagram of another level conversion unit provided in an embodiment of the present application, such as Fig.17 As shown, the level conversion unit 104 includes: a thirteenth switch K13, a fourteenth switch K14, a fifteenth switch K15, a seventh capacitor C7 and a direct current voltage conversion unit DC / DC, a first end of the thirteenth switch K13 is connected to the power supply AVDD, a second end of the thirteenth switch K13 is connected to the second output pin 1043, a first end of the seventh capacitor C7 is connected to the second output pin 1043, a second end of the seventh capacitor C7 is respectively connected to the first end and the first output pin 1042 of the fourteenth switch K14, a second end of the fourteenth switch K14 is grounded, an input end of the direct current voltage conversion unit DC / DC is connected to the power supply AVDD, an output end of the direct current voltage conversion unit DC / DC is connected to a first end of the fifteenth switch K15, and the fifteenth switch The second end of K15 is connected to the second end of the seventh capacitor C7. The direct current voltage conversion unit DC / DC can boost or buck the output voltage of the power supply AVDD. The level conversion unit 104 is used to control the on and off of the thirteenth switch K13, the fourteenth switch K14 and the fifteenth switch K15 according to the first driving signal, so that the on and off states of the thirteenth switch K13 and the fourteenth switch K14 are the same, and the on and off states of the thirteenth switch K13 and the fifteenth switch K15 are opposite. When the thirteenth switch K13 is closed, a low level of the square wave signal is generated at the first output pin 1042, and when the fifteenth switch K15 is closed, a high level of the square wave signal is generated at the first output pin 1042. The output voltage of the power supply AVDD is equal to the supply voltage of the touch chip 101.

[0120] In one example, if Fig.17 As shown in (a) of FIG. 1 , when the first driving signal is at the first level, the thirteenth switch K13 and the fourteenth switch K14 are closed, and the fifteenth switch K15 is opened. At this time, the seventh capacitor C7 in the circuit is charged by the power supply AVDD, as shown in FIG. Fig.17 As shown in (b) in the figure, when the first driving signal is at the second level, the thirteenth switch K13 and the fourteenth switch K14 are disconnected, and the fifteenth switch K15 is closed, and the seventh capacitor C7 and the DC voltage conversion unit DC / DC jointly output a 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 to the first output pin 1042 and the second output pin 1043, the first output pin 1042 and the second output pin 1043 have a constant phase difference of the voltage output by the seventh capacitor C7.

[0121] The following example takes the power supply AVDD outputting a 3V voltage, and the DC voltage conversion unit DC / DC boosting the output voltage of the power supply AVDD by M times. Fig.17 As shown in (a) of FIG. 1 , when the first driving signal is at the first level, the thirteenth switch K13 and the fourteenth switch K14 are closed, and the fifteenth switch K15 is opened. 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 voltage of 0V, and the second output pin 1043 outputs an output voltage of 3V of the power supply AVDD connected to the thirteenth switch K13. Fig.17 As shown in (b), when the first driving signal is at the second level, the thirteenth switch K13 and the fourteenth switch K14 are disconnected, and the fifteenth switch K15 is closed. The DC voltage conversion unit DC / DC connected to the fifteenth switch K15 and the seventh capacitor C7 together output the output voltage 3*(M+1)V of M+1 times the power supply AVDD to the second output pin 1043. The DC voltage conversion unit DC / DC connected to the fifteenth switch K15 outputs the output voltage 3*MV of M times the power supply AVDD to the first output pin 1042. The voltage difference between the first output pin 1042 and the second output pin 1043 is 3V, which supplies power to 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-3*MV at this time. It should be understood that since the boost or buck of the power supply AVDD output voltage by the DC voltage conversion unit DC / DC may not be an integer multiple of the boost or buck, M is a natural number greater than or equal to 0.

[0122] It should be understood that the DC voltage conversion unit DC / DC can be a boost circuit, for example: a boost DC / DC circuit, or the DC voltage conversion unit DC / DC can be a step-down circuit, for example: a buck DC / DC circuit. The specific circuit can be set as needed. It should also be understood that the scheme of the DC voltage conversion unit DC / DC stepping down the output voltage of the power supply AVDD is similar in principle to the scheme of the DC voltage conversion unit DC / DC in the above embodiment stepping up the output voltage of the power supply AVDD, and will not be repeated here.

[0123] In the embodiment of the present application, by controlling the on and off 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 AVDD voltage whose output voltage difference with the first output pin 1042 is a constant value, thereby realizing the generation of a square wave signal and realizing constant voltage power supply to the touch chip 101, thereby transmitting the square wave signal in a closed loop, and performing touch position recognition on the sensing signal through the touch chip 101.

[0124] Fig.18 is a schematic diagram of another touch chip provided in an embodiment of the present application, such as Fig.18 As shown, the touch control 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.

[0125] In the embodiment of the present application, the touch chip 101 includes a current conversion unit 1016 and a processing unit 1017, so that 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 according to the identification signal, thereby realizing the identification of the touch position.

[0126] Fig.19 is a circuit diagram of a current conversion unit provided in an embodiment of the present application, such as Fig.19As shown, 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, a first end of the first resistor R1 is connected to the electrode, a second end of the first resistor R1 is connected to the positive input end of the transimpedance amplifier D1, a first end of the second resistor R2 is connected to the reference voltage VCMI, a second end of the second resistor R2 is connected to the negative input end of the transimpedance amplifier D1, a negative output end of the transimpedance amplifier D1 is connected to the first input end of the analog-to-digital converter 10161, a positive output end of the transimpedance amplifier D1 is connected to the second input end of the analog-to-digital converter 10161, a first end of the first feedback resistor Rf1 is connected to the positive electrode of the transimpedance amplifier D1 The input end is connected, the second end of the first feedback resistor Rf1 is connected to the negative output end of the transimpedance amplifier D1, the first end of the second feedback resistor Rf2 is connected to the negative input end of the transimpedance amplifier D1, the second end of the second feedback resistor Rf2 is connected to the positive output end of the transimpedance amplifier D1, the first end of the third capacitor C3 is connected to the first end of the first feedback resistor Rf1, the second end of the third capacitor C3 is connected to the second end of the first feedback resistor Rf1, the first end of the fourth capacitor C4 is connected to the first end of the second feedback resistor Rf2, the second end of the fourth capacitor C4 is connected to the second end of the second feedback resistor Rf2, the transimpedance amplifier D1 can convert the sensing signal into an identification voltage, the analog-to-digital converter 10161 can receive the identification voltage, and convert the identification voltage into an identification signal.

[0127] In one example, the sensing signal is a current signal, and the identification current can be converted into a square wave signal through the feedback resistor, the capacitor and the transimpedance amplifier D1. Specifically, the identification current acts on the feedback resistor, and the transimpedance amplifier D1 identifies the voltage across the feedback resistor and compares it with the reference voltage VCMI to generate a square wave signal. The square wave signal output by the transimpedance amplifier D1 can be converted into a digital signal through the analog-to-digital converter 10161.

[0128] In the embodiment of the present application, the identification current can be amplified through the transimpedance amplifier D1, and the induced signal can be converted into an identification voltage. The identification voltage can be converted into a digital signal through the analog-to-digital converter 10161, thereby converting the identification current into an identification signal, so that the processor can identify the touch instruction according to the identification signal, thereby realizing touch recognition.

[0129] Fig. 20 is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Fig. 20As shown, the current conversion unit 1016 also includes: a low-pass filter 10162, a first input end of the low-pass filter 10162 is connected to the negative output end of the transimpedance amplifier D1, a second input end of the low-pass filter 10162 is connected to the positive output end of the transimpedance amplifier D1, a first output end of the low-pass filter 10162 is connected to the first input end of the analog-to-digital converter 10161, and a second output end of the low-pass filter 10162 is connected to the second input end 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.

[0130] In an embodiment of the present application, the current conversion unit 1016 also includes a low-pass filter 10162, which can perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage, for example: filtering out out-of-band signal interference or signal noise, while also preventing the Nyquist aliasing effect and improving the signal-to-noise ratio of the identification voltage input to the analog-to-digital converter 10161. The identification signal converted by the analog-to-digital converter 10161 can contain fewer identification signals corresponding to external signal interference, thereby reducing the impact of external signal interference on touch recognition and improving the accuracy of touch recognition.

[0131] Fig.21 is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Fig.21 As shown, the current conversion unit 1016 also includes: a sampling and holding module 10163, the sampling and holding 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, a first end of the ninth switch K9 is connected to the first output end of the low-pass filter 10162, a second end of the ninth switch K9 is simultaneously connected to the first end of the fifth capacitor C5 and the first end of the tenth switch K10, a second end of the tenth switch K10 is connected to the first input end of the analog-to-digital converter 10161, a second end of the fifth capacitor C5 is grounded, a first end of the eleventh switch K11 is connected to the second output end of the low-pass filter 10162, a second end of the eleventh switch K11 is simultaneously connected to the first end of the sixth capacitor C6 and the first end of the twelfth switch K12, a second end of the twelfth switch K12 is connected to the second input end of the analog-to-digital converter 10161, a second end of the sixth capacitor C6 is grounded, and the sampling and holding module 10163 can hold the identification voltage.

[0132] Since the sensing signal is a changing signal, the identification voltage output by the transimpedance amplifier D1, that is, the square wave signal is a changing square wave signal. In order to ensure that all signals are input to the analog-to-digital converter 10161 and converted into identification signals, a sampling and holding circuit is provided. When the analog-to-digital converter 10161 performs digital-to-analog conversion, the subsequent identification voltage can be temporarily stored to avoid the analog-to-digital converter 10161 missing part of the identification voltage due to the change of the identification voltage. Specifically, when the analog-to-digital converter 10161 performs digital-to-analog conversion, the tenth switch The ninth switch K9 and / or the eleventh switch K11 are disconnected, and the identification voltage is temporarily stored in the capacitor C5 and the sixth capacitor C6. When the analog-to-digital converter 10161 is idle, the ninth switch K9 and / or the eleventh switch K11 are disconnected, and the tenth 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, and the sampling and holding effect is achieved 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.

[0133] In the embodiment of the present application, the current conversion unit 1016 also includes a sampling and holding module 10163. The sampling and holding module 10163 can sample and hold the identification 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 avoid the change of the identification voltage due to the change of the sensing signal, causing the analog-to-digital converter 10161 to miss part of the identification voltage, and can ensure that the analog-to-digital converter 10161 converts all the identification voltages into identification signals, thereby improving the accuracy of touch recognition.

[0134] Fig. 22 is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Fig. 22 As shown, the current conversion unit 1016 also includes: a buffer amplifier 10164, a first input terminal of the buffer amplifier 10164 is connected to the second terminal of the tenth switch K10, a second input terminal of the buffer amplifier 10164 is connected to the second terminal of the twelfth switch K12, a first output terminal of the buffer amplifier 10164 is connected to the first input terminal of the analog-to-digital converter 10161, a second output terminal of the buffer amplifier 10164 is connected to the second input terminal of the analog-to-digital converter 10161, and the buffer amplifier 10164 can perform signal amplification processing on the identification voltage.

[0135] In the embodiment of the present application, the current conversion unit 1016 also includes a buffer amplifier 10164. The buffer amplifier 10164 can amplify the identification voltage signal. The buffer amplifier 10164 can be a level converter or a buffer, etc. Specifically, the high level in the identification voltage can be increased and the low level can be reduced to achieve amplification of the signal amplitude, thereby making the identification voltage signal amplitude of the input analog-to-digital converter 10161 larger, avoiding the inability to identify touch due to the small identification voltage that makes the analog-to-digital converter 10161 unable to convert into an identification signal, thereby improving the accuracy of touch recognition.

[0136] An embodiment of the present application also provides a touch chip, which is used to send a first drive signal to a touch unit, and identify the touch position based on the induction signal generated in the closed loop after the touch unit, the finger, and the electrodes on the touch screen form a closed loop when a finger touches the screen.

[0137] In the embodiment of the present application, the touch control chip 101 may be the touch control chip 101 in any of the above embodiments, and may perform the operations in any of the above embodiments, which will not be described in detail herein.

[0138] Fig.23 is a schematic diagram of a display screen module provided in an embodiment of the present application, such as Fig.23 As shown, the display screen module 400 includes the touch device 100 and the electrode 401 in any of the above embodiments, and the electrode 401 is used to form a closed loop with the touch unit 102 and the finger when the finger touches, wherein the electrode 401 includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0139] Fig.24 is a schematic diagram of an electronic device provided in an embodiment of the present application, such as Fig.24 As shown, the electronic device 200 includes a processor 203 and the 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 control device 100, so that the touch control chip 101 in the touch control device 100 outputs a first drive signal to the touch control unit 102 or outputs a second drive signal to the electrode 401.

[0140] In an embodiment of the present application, the processor 203 can send a switching signal to the touch control device 100, so that the touch control chip 101 in the touch control device 100 outputs a first drive signal to the touch control unit 102 or outputs a second drive signal to the electrode 401, thereby switching between daily use scenarios and underwater use scenarios. Since the conventional touch mode and the underwater touch mode are switched according to the switching signal, it can be applicable to touch position recognition in daily scenes and underwater scenes, and can be applicable to touch position recognition in a variety of usage scenarios, and has high applicability.

[0141] Fig.25 is a rendering of a touch position recognition provided by an embodiment of the present application, Fig.25 Applicable to the effects produced in any embodiment of the present application, such as Fig.25 As shown, the three horizontal images are different frames collected at the same time, and the three vertical images are schematic diagrams of fingers in different positions. Fig.25 The horizontal axis of each table is used to represent different electrodes, and the vertical axis is used to represent the signal amount of the envelope signal, such as Fig.25 As shown, the envelope signal is different when the finger is in different positions, so touch position recognition can be performed underwater.

[0142] 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 each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment, since it is basically similar to the method described in the device and system embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of other embodiments.

[0143] It should be understood that the above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0144] It should be understood that an element described in singular form herein or shown in the drawings as only one does not limit the number of the element to one. In addition, modules or elements described or shown as separate herein may be combined into a single module or element, and modules or elements described or shown as single herein may be split into multiple modules or elements.

[0145] It should also be understood that the terms and expressions used herein are for description only, and one or more embodiments of this specification should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or parts thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, changes and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

Claims

1. A touch device, characterized in that: include: A touch control chip, wherein the touch control chip is used to send a first driving signal to the touch control unit; The touch control unit is used to receive the first driving signal. When a finger touches the screen, the touch control 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 control chip identifies the touch position according to the sensing signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.

2. The touch control device according to claim 1, characterized in that: When the touch chip receives a switching signal from a processor in the electronic device, the touch chip stops sending the first driving signal to the touch unit, sends a second driving signal to the electrode, and performs position recognition according to the touch signal output by the electrode.

3. The touch control 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 according to the touch signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes; Alternatively, at least one of the plurality of transverse electrodes and the plurality of longitudinal electrodes serves as both a driving electrode and a receiving electrode, the touch control chip sends the second driving signal to the driving electrode, and performs position recognition according to the touch control signal output by the receiving electrode.

4. The touch control device according to claim 2, characterized in that: The touch control chip includes: a first switch and a second switch; The first switch is electrically connected to the touch control unit through the first pin of the touch control 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 control chip sends the first driving signal to the touch control unit through the first pin; When the first switch is opened and the second switch is closed, the touch control chip sends the second driving signal to the electrode through a plurality of second pins of the touch control chip.

5. The touch control device according to claim 4, characterized in that: The touch control unit comprises: a flexible circuit board; The flexible circuit board is arranged on the housing of the electronic device, the flexible circuit board is electrically connected to the first pin, and the flexible circuit board is used to receive the first driving signal. When the finger performs touch control, the flexible circuit board, 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; Alternatively, the touch control unit includes: a metal housing of the electronic device; The metal shell is electrically connected to the first pin, and the metal shell of the electronic device is used to receive the first drive signal. When the finger touches, the metal shell, the finger and the electrode form the closed loop, and the first drive signal is transmitted in the closed loop to generate the sensing signal.

6. The touch control device according to claim 4 or 5, characterized in that: The touch control device further includes: a signal amplification module; The input end of the signal amplifying module is connected to the first pin, and the output end of the signal amplifying module is connected to the touch control unit; The signal amplification module is used to perform level amplification processing on the first driving signal, and send the amplified first driving signal to the touch control unit, so that the touch control unit transmits the amplified first driving signal in the closed loop.

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

8. The touch control device according to claim 7, characterized in that: The second output pin of the level conversion unit is connected to the power supply pin of the touch control chip; The level conversion unit is used to transmit a power supply voltage to the touch control chip through the power supply pin, and a voltage difference between the power supply voltage and the square wave signal is equal to the power supply voltage of the touch control chip.

9. The touch control device according to claim 8, characterized in that: The level conversion unit includes N sub-circuits, where N is an integer greater than or equal to 2; The first subcircuit of the N subcircuits comprises a third switch, a fourth switch and a first capacitor, wherein a first end of the third switch is connected to a power source, a second end of the third switch is connected to the second output pin, a first end of the first capacitor is connected to the second output pin, a second end of the first capacitor is connected to a first end of the fourth switch and the first output pin respectively, and a second end of the fourth switch is grounded; The i-th subcircuit among the N subcircuits comprises a fifth switch, a sixth switch, a seventh switch and a second capacitor, a first end of the fifth switch is connected to the power supply, a second end of the fifth switch is connected to a first end of the sixth switch, a second end of the sixth switch is connected to a second end of a capacitor in an (i-1)-th subcircuit, a first end of the second capacitor is connected to a second end of the fifth switch, a second end of the second capacitor is connected to a first end of the seventh switch, and a second end of the seventh switch is grounded, wherein i is an integer greater than 1 and less than N; The Nth subcircuit of the N subcircuits comprises an eighth switch, a first end of the eighth switch is connected to the power supply, and a second end of the eighth switch is connected to the second end of the capacitor in the N-1th subcircuit; The level conversion unit is used to control the on and off of the switches in the N sub-circuits according to the first driving signal, so that the on and off states of the third switch, the fourth switch, the fifth switch and the seventh switch are the same, and the on and off states of the sixth switch and the eighth switch are the same, and the on and off states of the third switch and the eighth switch are opposite, and the low level of the square wave signal is generated at the first output pin when the third switch is closed, and the high level of the square wave signal is generated at the first output pin when the eighth switch is closed, and the output voltage of the power supply is equal to the power supply voltage of the touch chip; Alternatively, the level conversion unit includes: a thirteenth switch, a fourteenth switch, a fifteenth switch, a seventh capacitor and a DC voltage conversion unit; A first end of the thirteenth switch is connected to a power source, a second end of the thirteenth switch is connected to the second output pin, a first end of the seventh capacitor is connected to the second output pin, a second end of the seventh capacitor is connected to a first end of the fourteenth switch and the first output pin respectively, and a second end of the fourteenth switch is grounded; The input end of the DC voltage conversion unit is connected to a power supply, the output end of the DC voltage conversion unit is connected to a first end of a fifteenth switch, and the second end of the fifteenth switch is connected to a second end of the seventh capacitor; The DC voltage conversion unit is used to step up or down the output voltage of the power supply; The level conversion unit is used to control the on and off of the thirteenth switch, the fourteenth switch and the fifteenth switch according to the first driving signal, so that the on and off states of the thirteenth switch and the fourteenth switch are the same, and the on and off states of the thirteenth switch and the fifteenth switch are opposite, when the thirteenth switch is closed, the low level of the square wave signal is generated at the first output pin, when the fifteenth switch is closed, the high level of the square wave signal is generated at the first output pin, and the output voltage of the power supply is equal to the power supply voltage of the touch chip.

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

11. The touch control device according to claim 10, 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 end of the electrode, the second end of the first resistor is connected to the positive input end of the transimpedance amplifier, the first end of the second resistor is connected to a reference voltage, the second end of the second resistor is connected to the negative input end of the transimpedance amplifier, the negative output end of the transimpedance amplifier is connected to the first input end of the analog-to-digital converter, and the positive output end of the transimpedance amplifier is connected to the second input end of the analog-to-digital converter; The first end of the first feedback resistor is connected to the positive input terminal of the transimpedance amplifier, the second end of the first feedback resistor is connected to the negative output terminal of the transimpedance amplifier, the first end of the second feedback resistor is connected to the negative input terminal of the transimpedance amplifier, and the second end of the first feedback resistor is connected to the positive output terminal of the transimpedance amplifier; The first end of the 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 sensing 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.

12. The touch control device according to claim 11, characterized in that: The current conversion unit further includes: a low-pass filter; The first input end of the low-pass filter is connected to the negative output end of the transimpedance amplifier, the second input end of the low-pass filter is connected to the positive output end of the transimpedance amplifier, the first output end of the low-pass filter is connected to the first input end of the analog-to-digital converter, and the second output end of the low-pass filter is connected to the second input end of the analog-to-digital converter; The low-pass filter is used to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

13. The touch control device according to claim 12, characterized in that: The current conversion unit further includes: a sampling and holding module; The sampling and holding module includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a fifth capacitor and a sixth capacitor; The first end of the ninth switch is connected to the first output end of the low-pass filter, the second end of the ninth switch is connected to the first end of the fifth capacitor and the first end of the tenth switch, the second end of the tenth switch is connected to the first input end of the analog-to-digital converter, and the second end of the fifth capacitor is grounded; The first end of the eleventh switch is connected to the second output end of the low-pass filter, the second end of the eleventh switch is connected to the first end of the sixth capacitor and the first end of the twelfth switch, the second end of the twelfth switch is connected to the second input end of the analog-to-digital converter, and the second end of the sixth capacitor is grounded; The sampling and holding module is used to hold the identification voltage.

14. The touch control device according to claim 13, 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 perform signal amplification processing on the identification voltage.

15. A touch chip, characterized in that: The touch control chip is used to send a first driving signal to the touch control unit, and after the touch control unit responds to the first driving signal and the touch control unit, the finger and the electrodes on the touch screen form a closed loop when the finger touches the screen, the touch position is identified based on the sensing signal generated in the closed loop.

16. A display screen module, characterized in that: comprising an electrode and a touch control device as claimed in any one of claims 1 to 14; The electrodes are used to form a closed loop with the touch unit and the finger when the finger touches the touch screen, wherein the electrodes include horizontal electrodes and / or vertical electrodes arranged on the touch screen.

17. An electronic device, characterized in that: A display screen module comprising a processor and claim 16; The processor is electrically connected to the display screen module; The processor is used to send a switching signal to the touch control device, so that the touch control chip in the touch control device outputs a first driving signal to the touch control unit or outputs a second driving signal to the electrode.

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