Touch device, touch chip, display screen module and electronic equipment
By forming closed circuits of fingers, human body, and electrodes in electronic devices, and generating induction signals using the difference in conductivity between water and human body, the problem of underwater touch recognition is solved and touch position recognition is achieved in the underwater environment.
Patent Information
- Application Number
- CN202422156404.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-05-30
- Filing Date
- 2024-09-03
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-09-03
AI Technical Summary
Existing electronic devices cannot recognize finger touch commands underwater because they are more sensitive to water when identifying touch commands with electrodes and/or mutual capacities.
The first driving signal is output to the touch module through the touch chip, forming a closed circuit for fingers, human bodies, and electrodes, and using the difference in conductivity of water and human bodies and changes in equivalent capacitance to generate induction signals to realize touch position recognition.
The touch control device can identify the touch position in an underwater environment, and is suitable for a variety of usage scenarios, improving applicability.
Smart Images
Figure CN223308606U_ABST
Abstract
Description
[0001] This application claims priority to the invention application with an application date of May 30, 2024, application number "PCT / CN2024 / 096492", and patent name "Touch device, touch chip, display screen module and electronic device", all of which are incorporated herein by reference. Technical Field
[0002] The embodiments of the present application relate to the field of electrical engineering technology, and in particular to a touch device, a touch chip, a display screen module, and an electronic device. Background Art
[0003] With the development of 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 require touch control of the display screen underwater.
[0004] Currently, a touch control device included in a display screen of an electronic device uses electrode self-capacitance and / or mutual capacitance to identify touch control instructions.
[0005] However, since the electrode self-capacitance and / or mutual capacitance are sensitive to water when identifying touch commands, the touch commands of the finger cannot be recognized when the display screen is covered by water, resulting in that the existing electronic devices cannot be used underwater. Utility Model Content
[0006] In view of this, embodiments of the present application provide a touch device, a touch chip, a display screen module, and an electronic device to at least partially solve the above-mentioned problems.
[0007] According to a first aspect of an embodiment of the present application, a touch device is provided, comprising: a touch chip and a touch module, the touch chip being configured to output a first drive signal to the touch module; the touch module being configured to receive the first drive signal, wherein when a finger touches a touch screen, the touch module, the finger, a human body, and electrodes on the touch screen form a closed loop, the touch module sequentially transmitting the first drive signal to the closed loop through the human body and the finger to generate a sensing signal in the closed loop, and the touch chip identifying a touch position based on the sensing signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
[0008] According to a second aspect of an embodiment of the present application, a touch chip is provided, which is used to output a first drive signal to a touch module, and the touch module responds to the first drive signal according to the touch module. When a finger touches the screen, the touch module, the finger, the human body and the electrodes on the touch screen form a closed loop. The touch module transmits the first drive signal to the closed loop through the human body and the finger in turn, and the induction signal generated in the closed loop is used to identify the touch position, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
[0009] According to the third aspect of the embodiment of the present application, a display screen module is provided, comprising electrodes and a touch device as described in the first aspect of the embodiment of the present application; when a finger touches, the electrode forms a closed loop with the touch module, the human body and the finger, wherein the electrode includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.
[0010] According to the fourth aspect of the embodiments of the present application, an electronic device is provided, comprising a processor and the display screen module described in the second aspect of the embodiments of the present application; the processor is electrically connected to the display screen module; the processor is used to send a switching signal to the touch device so that the touch chip in the touch device outputs a first drive signal to the touch module or outputs a second drive signal to the electrode.
[0011] According to a fifth aspect of an embodiment of the present application, a touch device is provided, which is applied to a mobile phone, and the touch device includes: a touch chip and a touch module, the touch module including metal buttons and / or metal casing of the mobile phone; the touch chip is used to output a first drive signal to the touch module; the touch module is used to receive the first drive signal and, when a finger touches the screen, transmit the first drive signal to the finger through a human body in contact with the touch module, so that the finger senses the electrodes on the touch screen so that the electrodes form a sensing signal, and the touch chip identifies the touch position according to the sensing signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
[0012] According to a sixth aspect of an embodiment of the present application, a touch device is provided, which is applied to a wearable device, and the touch device includes: a touch chip and a touch module, the touch module including a metal shell and / or metal electrodes of the wearable device; the touch chip is used to output a first drive signal to the touch module; the touch module is used to receive the first drive signal and, when a finger touches the screen, transmit the first drive signal to the finger through a human body in contact with the touch module, so that the finger senses the electrodes on the touch screen so that the electrodes form a sensing signal, and the touch chip identifies the touch position according to the sensing signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
[0013] According to the touch device provided in the embodiment of the present application, the touch chip outputs a first drive signal to the touch module, and the touch module receives the first drive signal. When a finger touches the touch, the touch module, the human body, the finger, and the electrode form a closed loop, and an induction signal can be generated within the closed loop. As a result, the touch chip can identify the touch position based on the induction signal. Since a signal that changes according to the different conductivity between water and the human body, and the different equivalent capacitance between water and the electrode and the equivalent capacitance between the finger and the electrode are used to generate the induction signal, the generation of the induction signal is achieved. 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 underwater environments. 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
[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.
[0015] Figure 1 is a schematic diagram of a touch device provided in an embodiment of the present application;
[0016] Figure 2 is a schematic diagram of a touch device in a normal mode provided by an embodiment of the present application;
[0017] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of the present application;
[0018] Figure 4 is a schematic diagram of a touch device including a signal amplification module provided in an embodiment of the present application;
[0019] Figure 5is a schematic diagram of a touch module provided in an embodiment of the present application;
[0020] Figure 6 is a schematic diagram of an equivalent circuit diagram provided in an embodiment of the present application;
[0021] Figure 7 is a schematic diagram of a signal detection timing provided by an embodiment of the present application;
[0022] Figure 8 is a schematic diagram of another touch chip provided in an embodiment of the present application;
[0023] Figure 9 is a circuit diagram of a current conversion unit provided in an embodiment of the present application;
[0024] Figure 10 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;
[0025] Figure 11 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;
[0026] Figure 12 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;
[0027] Figure 13 is a schematic diagram of a display screen module provided in an embodiment of the present application;
[0028] Figure 14 is a schematic diagram of an electronic device provided in an embodiment of the present application;
[0029] Figure 15 This is a schematic diagram of an electronic device switching principle provided in an embodiment of the present application. DETAILED DESCRIPTION
[0030] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and in detail described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.
[0031] 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 instructions. However, since the electrode self-capacitance and / or mutual capacitance are more sensitive to water when identifying touch instructions, when the display screen is covered by water, it cannot recognize the touch instructions of the finger, resulting in the existing electronic equipment being unable to be used underwater.
[0032] In an embodiment of the present application, a touch device is provided. A touch chip outputs a first drive signal to a touch module, and the touch module receives the first drive signal. When a finger touches the surface, the touch module, the human body, the finger, and the electrode form a closed loop, and a sensing signal can be generated within the closed loop. As a result, the touch chip can identify the touch position based on the sensing signal. Since a signal that changes according to the different conductivity between water and the human body, and the different equivalent capacitance between water and the electrode and the equivalent capacitance between the finger and the electrode are used to generate the sensing signal, the generation of the sensing signal is achieved. Therefore, compared with the touch position identification based on electrode self-capacitance or mutual capacitance in the prior art, the touch device can be suitable for touch position identification in underwater environments. Therefore, the touch device can be suitable for touch position identification in a variety of usage scenarios and has high applicability.
[0033] The touch device provided by the present application is described below through embodiments.
[0034] Figure 1 is a schematic diagram of a touch device provided in an embodiment of the present application, such as Figure 1 As shown, the touch device 100 includes a touch chip 101 and a touch module 102. The touch chip 101 can output a first drive signal to the touch module 102, and the touch module 102 can receive the first drive signal. When a finger touches the touch screen, the touch module 102, the finger, the human body and the electrode 401 on the touch screen form a closed loop. The touch module 102 transmits the first drive signal to the closed loop through the human body and the finger in turn to generate a sensing signal in the closed loop. The touch chip 101 identifies the touch position according to the sensing signal, wherein the electrode 401 includes multiple horizontal electrodes and / or multiple vertical electrodes.
[0035] The touch device 100 includes a touch chip 101 and a touch module 102. The touch chip 101 can be electrically connected to the touch module 102. The touch chip 101 can output a first drive signal to the touch module 102. In one example, the first drive signal can be a voltage signal. The first drive signal can be a sine wave waveform signal, a square wave waveform signal, a trapezoidal wave waveform signal, etc.
[0036] The touch module 102 can receive a first drive signal. When a finger touches the touch screen, the finger, the touch module 102, the human body and the electrode 401 form a closed loop. Specifically, the human body is in contact with the touch module 102, and the human body can conduct electricity, which is equivalent to an equivalent resistor. There is an equivalent capacitance between the finger and the electrode 401. Therefore, the touch module 102, the human body in contact with the touch module 102, the finger, the equivalent capacitance between the finger and the electrode 401, and the electrode 401 form a closed loop. Since the touch module 102 receives the first drive signal, the first drive signal can be transmitted to the closed loop through the human body and the finger in sequence. For example: when the left hand holds the electronic device and touches it with the finger of the right hand, the left hand is in contact with the touch module 102, the first drive signal flows through the left hand to the human body, and then is transmitted to the closed loop through the finger of the right hand. An induction signal can be generated in the closed loop. Specifically, when in an underwater environment, water and the touch module 102 are in contact, and there is an equivalent capacitance between the water and the electrode 401, so the touch module 102, water and the electrode 401 form a closed loop. When a finger touches, due to the difference in conductivity between water and the human body, and the difference in the equivalent capacitance between water and the electrode 401 and the equivalent capacitance between the finger and the electrode 401, the signal in the electrode 401 changes, forming an induction signal.
[0037] It should be noted that since the first driving signal output by the touch chip 101 needs to pass through the human body and fingers in sequence, and the human body and fingers are equivalent to larger resistors, the signal amplitude of the first driving signal transmitted in the closed loop is smaller than the signal amplitude of the first driving signal output by the touch chip 101, but the waveform of the signal will not be changed.
[0038] The touch chip 101 is electrically connected to the electrode 401. After receiving the sensing signal transmitted by the electrode 401, the touch chip 101 can identify the touch position based on the sensing signal. In one example, the touch chip 101 can convert the sensing signal into a digital signal and send the digital signal to the processor of the electronic device, thereby realizing touch position identification.
[0039] In the embodiment of the present application, the touch chip 101 outputs a first drive signal to the touch module 102, and the touch module 102 receives the first drive signal. When a finger touches the body, the touch module 102, the human body, the finger, and the electrode 401 form a closed loop, and a sensing signal can be generated within the closed loop. As a result, the touch chip 101 can identify the touch position based on the sensing signal. Since a signal that changes according to the different conductivity between water and the human body, and the difference between the equivalent capacitance between water and the electrode 401 and the equivalent capacitance between the finger and the electrode 401 are used to generate the sensing signal, the generation of the sensing signal is achieved. Therefore, compared with the touch position identification based on 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 underwater environments. Therefore, the touch device 100 can be suitable for touch position identification in a variety of usage scenarios and has high applicability.
[0040] Figure 2 is a schematic diagram of a touch device in a normal mode provided by an embodiment of the present application, such as Figure 2 As shown, when the touch chip 101 receives the switching signal from the processor in the electronic device, the touch chip 101 stops outputting the first driving signal to the touch module 102, and the touch chip 101 sends the second driving signal to the electrode 401, and performs position recognition according to the touch signal output by the electrode 401.
[0041] When the touch chip 101 receives a switching signal from the processor, it switches from underwater touch mode to normal touch mode. The touch chip 101 stops outputting the first drive signal, and the touch module 102 stops sensing. The touch chip 101 then outputs a second drive signal to the electrode 401. The second drive signal can be a sine wave, a square wave, or a trapezoidal wave. When the electrode 401 receives the second drive signal, it generates a sensing signal, and the touch chip 101 identifies the touch position based on the sensing signal.
[0042] It should be understood that Figure 2 As shown, the multiple electrodes 401 include multiple horizontal electrodes and / or multiple vertical electrodes, and the touch chip 101 is electrically connected to each electrode 401. When the multiple horizontal electrodes and / or the multiple vertical electrodes generate sensing signals, the touch chip 101 can detect the sensing signals generated in the multiple horizontal electrodes and / or the multiple vertical electrodes.
[0043] In an embodiment of the present application, when the touch chip 101 receives a switching signal, the touch chip 101 stops outputting the first drive signal and outputs the second drive signal to the electrode 401, thereby being applicable to touch position recognition in daily usage scenarios. Since the conventional touch mode and the underwater touch mode are switched according to the switching signal, it is applicable to touch position recognition in daily scenes and underwater scenes, and is applicable to touch position recognition in a variety of usage scenarios, with high applicability.
[0044] In a possible implementation, when the electronic device is in underwater mode, the touch chip 101 outputs a first driving signal to the touch module 102 ; when the electronic device is in non-underwater mode, the touch chip 101 sends a second driving signal to the electrode 401 .
[0045] When the electronic device is in underwater mode, the touch chip 101 outputs a first drive signal, and the touch module 102 receives the first drive signal. When a finger touches the touch screen, the finger, the touch module 102, the human body and the electrode 401 form a closed loop. Specifically, the contact between the human body and the touch module 102 and the conductivity of the human body are equivalent to an equivalent resistance. There is an equivalent capacitance between the finger and the electrode 401. Therefore, the touch module 102, the human body in contact with the touch module 102, the finger, the equivalent capacitance between the finger and the electrode 401, and the electrode 401 form a closed loop. Due to the touch module 102 receives the first drive signal, so the first drive signal can be transmitted to the closed loop through the human body and the finger in sequence. Since the water is in contact with the touch module 102 when the finger is not touching, and there is an equivalent capacitance between the water and the electrode 401, the touch module 102, the water and the electrode 401 form a closed loop. When the finger touches, the conductivity of the water is different from that of the human body, and the equivalent capacitance between the water and the electrode 401 is different from the equivalent capacitance between the finger and the electrode 401, the signal in the electrode 401 changes, forming an induction signal.
[0046] When the electronic device is in the non-underwater mode, the touch chip 101 stops outputting the first drive signal. At this point, the touch module 102 cannot receive the first drive signal and stops sensing. The touch chip 101 then outputs a second drive signal to the electrode 401. The second drive signal can be a sine wave, a square wave, a trapezoidal wave, or the like. Upon receiving the second drive signal, the electrode 401 generates a sensing signal, and the touch chip 101 identifies the touch position based on the sensing signal.
[0047] 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.
[0048] In an embodiment of the present application, when the electronic device is in underwater mode, the touch chip 101 outputs a first drive signal. When the electronic device is in non-underwater mode, the touch module 101 sends a second drive signal to the electrode 401. Thus, the electronic device can switch between underwater mode and 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.
[0049] 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.
[0050] One of the multiple horizontal electrodes and the multiple vertical electrodes serves as a driving electrode, and the touch chip 101 outputs a driving signal to the driving electrode. The other of the multiple horizontal electrodes and the multiple vertical electrodes serves as a receiving electrode and outputs a sensing signal. The touch chip 101 performs touch recognition based on the sensing signal and can identify the touch position of the finger. This method is a mutual capacitance detection method.
[0051] In addition, in another possible implementation, the self-capacitance detection method can be superimposed to identify the touch position of the finger, and at least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip 101 sends a driving signal to the driving electrode and performs position identification based on the sensing signal output by the receiving electrode. For example, the touch chip 101 outputs a driving signal to the multiple horizontal electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple horizontal electrodes (receiving electrodes), or the touch chip 101 outputs a driving signal to the multiple vertical electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple vertical electrodes (receiving electrodes), or the touch chip 101 simultaneously outputs a driving signal to the multiple horizontal electrodes and the multiple vertical electrodes and simultaneously receives the sensing signals output by the multiple horizontal electrodes and the multiple vertical electrodes, and the touch chip 101 identifies the touch position based on the received sensing signals.
[0052] In an embodiment of the present application, when the touch chip 101 receives a switching signal, the touch chip stops outputting the first drive signal and outputs the second drive signal to the electrode 401, thereby enabling touch position recognition to be performed through the electrode 401 by adopting self-capacitance or mutual capacitance, which can be applicable to touch position recognition in daily use scenarios. Since daily scenes and underwater scenes are switched according to the switching signal, touch position recognition can be applicable to daily scenes and underwater scenes. The touch device 100 can be applicable to touch position recognition in a variety of usage scenarios and has high applicability.
[0053] Figure 3 is a schematic diagram of a touch chip provided in an embodiment of the present application, such as Figure 3 As shown, the touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is electrically connected to the first pin 1011, one end of the second switch K2 is connected to the first pin 1011, and the other end of the second switch K2 is grounded. When the first switch K1 is closed and the second switch K2 is disconnected, the touch chip 101 outputs a first drive signal to the touch module 102 through the first pin 1011. When the first switch K1 is disconnected and the second switch K2 is closed, the touch chip 101 stops outputting the first drive signal to the touch module 102 and sends a second drive signal to the electrode 401.
[0054] The touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is arranged between the first signal generator 1012 and the first pin 1011. One end of the first pin 1011 is connected to the first switch K1, and the other end of the first pin 1011 is electrically connected to the touch module 102. One end of the second switch K2 is connected to the first pin 1011, and the other end of the second switch K2 is grounded. When the first switch K1 is closed and the second switch K2 is open, the first signal generator 1012 in the touch chip 101 generates a first drive signal and transmits the first drive signal to the first pin 1011 through the closed first switch K1. The first pin 1011 sends the first drive signal to the touch module 102 electrically connected to the first pin 1011, thereby enabling touch position recognition in underwater scenes.
[0055] When the second switch K2 is closed, the touch module 102 is grounded through the first pin 1011 and the closed second switch K2. At this time, the touch module 102 is short-circuited by the ground line, and the touch chip 101 stops outputting the first drive signal to the touch module 102. It should be understood that when the second switch K2 is closed, in order to prevent the touch chip 101 from leaking electricity to the ground line, the first switch K1 will be disconnected at this time. The touch chip 101 stops outputting the first drive signal to the touch module 102 and then outputs the second drive signal to the electrode 401, so that touch position recognition can be performed in daily scenarios.
[0056] In an embodiment of the present application, the touch chip 101 includes a first switch K1 and a second switch K2. When the first switch K1 is closed and the second switch K2 is disconnected, the touch chip 101 outputs a first drive signal to the touch module 102. When the first switch K1 is disconnected and the second switch K2 is closed, the touch chip 101 sends a second drive signal to the electrode 401, thereby achieving switching between underwater touch recognition mode and 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 scenarios and underwater scenarios. The touch device 100 can be used for touch position recognition in a variety of usage scenarios and has high applicability.
[0057] Figure 4 is a schematic diagram of a touch device including a signal amplification module provided in an embodiment of the present application. Figure 4 As shown, the touch device 100 also includes: a signal amplifying module 103, the input end of the signal amplifying module 103 is connected to the first pin 1011, and the output end of the signal amplifying module 103 is connected to the touch module 102. The signal amplifying module 103 can amplify the level of the first driving signal and send the amplified first driving signal to the touch module 102. When the finger touches, the touch module 102 transmits the amplified first driving signal to the closed loop through the human body and the finger in sequence.
[0058] The signal amplification module 103 can amplify the first drive signal output by the touch chip 101. The input end of the signal amplification module 103 receives the first drive signal output by the touch chip 101 through the first pin 1011, then amplifies the first drive signal, and sends the amplified first drive signal to the touch module 102. The touch module 102 then transmits the amplified first drive signal to the closed loop through the human body and fingers in turn, that is, the closed loop generates a sensing signal based on the amplified first drive signal.
[0059] In one example, the difference range between the peak and the trough of the first drive signal before signal amplification is [1Vpp, 10Vpp], that is, the difference range between the high level and the low level is between 1Vpp-10Vpp, and the difference range between the peak and the trough of the first drive signal after signal amplification processing is [1Vpp, 30Vpp], that is, the difference range between the high level and the low level is between 1Vpp-30Vpp.
[0060] In the embodiment of the present application, the touch device 100 further includes a signal amplification module 103, which can perform signal amplification processing on the first drive signal output by the touch chip 101, thereby increasing the signal amplitude of the first drive signal. As a result, the first drive signal with a larger amplitude can be transmitted to the closed loop through the human body and finger, so that the signal amplitude of the generated sensing signal is larger, thereby improving the sensitivity of the touch device 100 in identifying the touch position.
[0061] In a possible implementation, the touch module includes a metal button and / or a metal casing of a mobile phone, or the touch module includes a metal casing and / or a metal electrode of a wearable device.
[0062] Figure 5 is a schematic diagram of a touch module provided in an embodiment of the present application, such as Figure 5 As shown, Figure 5 (a) shows that the metal button 1021 of the mobile phone is used as a touch module. Figure 5 (b) shows that the metal shell 1022 and / or the metal electrode 1023 of the watch are used as the touch module.
[0063] When underwater, the human body comes into contact with the touch module, for example: Figure 5 (a) in which the finger touches the metal button 1021 of the mobile phone. Figure 5 (b) The watch is worn on the body so that the human body contacts the metal housing 1022 or the metal electrode 1023 of the electronic device. In one example, Figure 6 is a schematic diagram of an equivalent circuit diagram provided in an embodiment of the present application, such as Figure 6 As shown, when the finger 301 touches, the touch module 102 contacts the human body 300, and the touch module 102, the human body 300, the finger 301 and the electrode 401 form a closed loop. The electrode 401 can be a horizontal electrode and / or a vertical electrode. Figure 6 The equivalent signal source L1 is the first drive signal received by the touch module 102, and the capacitor CHT1 is the equivalent capacitance between the finger 301 and the electrode 401. The touch module 102 transmits the first drive signal to the finger 301 through the human body 300. There is mutual capacitance between the finger 301 and the electrode 401. Due to the different conductivity of water and the human body 300, and the difference between the equivalent capacitance between water and the electrode 401 and the equivalent capacitance between the finger 300 and the electrode 401, the signal in the closed loop changes, that is, an induction signal is generated. The electrode 401 sends the induction signal to the touch chip 101 through the pin of the touch chip 101, and the touch chip 101 identifies the touch position based on the induction signal.
[0064] Figure 7 This is a schematic diagram of a signal detection timing provided by an embodiment of the present application, such as Figure 7 As shown, a first driving signal of duration t1 is output to the touch control module 102. Signal detection is performed on the vertical electrodes in the electrode 401 during the time period 0-t1 to determine the vertical coordinate of the touch position. A first driving signal of duration t1 is output again to the touch control module 102. Signal detection is performed on the horizontal electrodes in the electrode 401 during the time period t1 to 2*t1 to determine the horizontal coordinate of the touch position. Thus, the horizontal and vertical coordinates of the touch position can be detected within the time period 2*t1, thereby determining the touch position.
[0065] In an embodiment of the present application, the touch module 102 includes a metal button of an electronic device and / or a metal casing of the electronic device, so that when a finger touches the electronic device, the metal button of the electronic device and / or the metal casing of the electronic device forms a closed loop with the human body, the finger and the electrode 401, and the touch module 102 transmits the first drive signal to the closed loop through the human body and the finger in turn, thereby realizing the identification of the touch position underwater. Since the touch module 102 includes the metal button of the electronic device and / or the metal casing of the electronic device, there is no need to set up an additional touch module, which reduces costs.
[0066] Figure 8 is a schematic diagram of another touch chip provided in an embodiment of the present application, such as Figure 8 As shown, the touch chip 101 includes a current conversion unit 1013 and a processing unit 1014. The current conversion unit 1013 can generate an identification signal according to the sensing signal, and the processing unit 1014 can identify the touch position according to the identification signal.
[0067] In the embodiment of the present application, the touch chip 101 includes a current conversion unit 1013 and a processing unit 1014, so that the current conversion unit 1013 can receive the sensing signal and convert the sensing signal into an identification signal. The processing unit 1014 can identify the touch position based on the identification signal, thereby realizing the identification of the touch position.
[0068] Figure 9 is a circuit diagram of a current conversion unit provided in an embodiment of the present application, such as Figure 9As shown, the current conversion unit 1013 includes a transimpedance amplifier D1, a first resistor R1, a second resistor R2, a first feedback resistor Rf1, a second feedback resistor Rf2, a first capacitor C1, a second capacitor C2 and an analog-to-digital converter 10131, wherein the first end of the first resistor R1 is connected to the electrode, the second end of the first resistor R1 is connected to the positive input terminal of the transimpedance amplifier D1, the first end of the second resistor R2 is connected to the reference voltage VCMI, the second end of the second resistor R2 is connected to the negative input terminal of the transimpedance amplifier D1, the negative output terminal of the transimpedance amplifier D1 is connected to the first input terminal of the analog-to-digital converter 10131, the positive output terminal of the transimpedance amplifier D1 is connected to the second input terminal of the analog-to-digital converter 10131, the first end of the first feedback resistor Rf1 is connected to the positive input terminal of the transimpedance amplifier D1 The positive input terminal is connected, the second end of the first feedback resistor Rf1 is connected to the negative output terminal of the transimpedance amplifier D1, the first end of the second feedback resistor Rf2 is connected to the negative input terminal of the transimpedance amplifier D1, the second end of the second feedback resistor Rf2 is connected to the positive output terminal of the transimpedance amplifier D1, the first end of the first capacitor C1 is connected to the first end of the first feedback resistor Rf1, the second end of the first capacitor C1 is connected to the second end of the first feedback resistor Rf1, the first end of the second capacitor C2 is connected to the first end of the second feedback resistor Rf2, the second end of the second capacitor C2 is connected to the second end of the second feedback resistor Rf2, the transimpedance amplifier D1 can convert the sensing signal into an identification voltage, the analog-to-digital converter 10131 can receive the identification voltage and convert the identification voltage into an identification signal.
[0069] In one example, the sensing signal is a current signal. 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, 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 10131.
[0070] In an embodiment of the present application, the identification current can be transimpedance amplified through the transimpedance amplifier D1, and the sensing signal can be converted into an identification voltage. The identification voltage can be converted into a digital signal through the analog-to-digital converter 10131, 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.
[0071] Figure 10 is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Figure 10As shown, the current conversion unit 1013 also includes: a low-pass filter 10132, a first input end of the low-pass filter 10132 is connected to the negative output end of the transimpedance amplifier D1, a second input end of the low-pass filter 10132 is connected to the positive output end of the transimpedance amplifier D1, a first output end of the low-pass filter 10132 is connected to the first input end of the analog-to-digital converter 10131, and a second output end of the low-pass filter 10132 is connected to the second input end of the analog-to-digital converter 10131. The low-pass filter 10132 can perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.
[0072] In an embodiment of the present application, the current conversion unit 1013 also includes a low-pass filter 10132, which can perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage, for example: filtering out out-of-band signal interference or signal noise, and at the same time preventing the Nyquist aliasing effect, thereby improving the signal-to-noise ratio of the identification voltage input to the analog-to-digital converter 10131, and making the identification signal converted by the analog-to-digital converter 10131 have 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.
[0073] Figure 11 This is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Figure 11 As shown, the current conversion unit 1013 further includes: a sampling and holding module 10133, which includes a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a third capacitor C3, and a fourth capacitor C4. A first end of the third switch K3 is connected to the first output end of the low-pass filter 10132, a second end of the third switch K3 is connected to both the first end of the third capacitor C3 and the first end of the fourth switch K4, a second end of the fourth switch K4 is connected to the first input end of the analog-to-digital converter 10131, a second end of the third capacitor C3 is grounded, a first end of the fifth switch K5 is connected to the second output end of the low-pass filter 10132, a second end of the fifth switch K5 is connected to both the first end of the fourth capacitor C4 and the first end of the sixth switch K6, a second end of the sixth switch K6 is connected to the second input end of the analog-to-digital converter 10131, and a second end of the fourth capacitor C4 is grounded. The sampling and holding module 10133 can hold the identification voltage.
[0074] Since the sensing signal is a varying signal, the identification voltage output by the transimpedance amplifier D1, i.e., the square wave signal, is a varying square wave signal. To ensure that all signals input to the analog-to-digital converter 10131 are converted into identification signals, a sample-and-hold circuit is provided. This circuit can temporarily store subsequent identification voltages when the analog-to-digital converter 10131 performs digital-to-analog conversion, thereby preventing the analog-to-digital converter 10131 from missing portions of the identification voltage due to variations in the identification voltage. Specifically, when the analog-to-digital converter 10131 performs digital-to-analog conversion, the fourth switch K4 and / or the sixth switch K6 can be disconnected, and the identification voltage can be temporarily stored via the third capacitor C3 and the fourth capacitor C4. When the analog-to-digital converter 10131 is idle, the third switch K3 and / or the fifth switch K5 can be disconnected, and the fourth switch K4 and / or the sixth switch K6 can be closed, so that the analog-to-digital converter 10131 receives the identification voltage temporarily stored in the capacitors. A sample-and-hold effect is achieved via the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the third capacitor C3, and the fourth capacitor C4.
[0075] In the embodiment of the present application, the current conversion unit 1013 also includes a sampling and holding module 10133. The sampling and holding module 10133 can sample and hold the identification voltage output by the transimpedance amplifier D1 through the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the third capacitor C3 and the fourth capacitor C4. This can avoid the change in the identification voltage due to the change in the sensing signal, causing the analog-to-digital converter 10131 to miss part of the identification voltage, and can ensure that the analog-to-digital converter 10131 converts all the identification voltages into identification signals, thereby improving the accuracy of touch recognition.
[0076] Figure 12 This is a circuit diagram of another current conversion unit provided in an embodiment of the present application, such as Figure 12 As shown, the current conversion unit 1013 further includes: a buffer amplifier 10134, wherein a first input terminal of the buffer amplifier 10134 is connected to the second terminal of the fourth switch K4, a second input terminal of the buffer amplifier 10134 is connected to the second terminal of the sixth switch K6, a first output terminal of the buffer amplifier 10134 is connected to the first input terminal of the analog-to-digital converter 10131, and a second output terminal of the buffer amplifier 10134 is connected to the second input terminal of the analog-to-digital converter 10131. The buffer amplifier 10134 can perform signal amplification processing on the identification voltage.
[0077] In an embodiment of the present application, the current conversion unit 1013 also includes a buffer amplifier 10134. The buffer amplifier 10134 can amplify the identification voltage signal. The buffer amplifier 10134 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 10131 larger, avoiding the inability of the analog-to-digital converter 10131 to convert the identification voltage into an identification signal due to the small identification voltage, resulting in the inability to identify the touch, thereby improving the accuracy of touch recognition.
[0078] An embodiment of the present application also provides a touch chip, which is used to output a first drive signal to the touch module, and respond to the first drive signal according to the touch module. When a finger touches the screen, the touch module, the finger, the human body and the electrodes on the touch screen form a closed loop. The touch module transmits the first drive signal to the closed loop through the human body and the finger in turn, and the induction signal generated in the closed loop is used to identify the touch position, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
[0079] In the embodiment of the present application, the touch chip 101 may be the touch chip 101 in any of the above embodiments, and may perform the operations in any of the above embodiments, which will not be described in detail here.
[0080] Figure 13 is a schematic diagram of a display screen module provided in an embodiment of the present application, such as Figure 13 As shown, the display screen module 400 includes electrodes 401 and the touch device 100 in any of the above embodiments. When a finger touches the screen, the electrode 401 forms a closed loop with the touch module, the human body and the finger, wherein the electrode 401 includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.
[0081] Figure 14 is a schematic diagram of an electronic device provided in an embodiment of the present application, such as Figure 14 As shown, the electronic device 200 includes a processor 201 and the display screen module 400 in the above embodiment. The processor 201 is electrically connected to the display screen module 400. The processor 201 is used to send a switching signal to the touch device 100, so that the touch chip 101 in the touch device 100 outputs a first drive signal to the touch module 102 or outputs a second drive signal to the electrode 401.
[0082] In one example, Figure 15 This is a schematic diagram of an electronic device switching principle provided by an embodiment of the present application, such as Figure 15As shown, when the electronic device is in underwater touch mode, the touch position can be identified through the touch device. When the electronic device is in non-underwater mode, the touch position can be detected through the electrodes in the screen module. In one example, the electronic device can send a switching signal to the touch chip in the touch device through the processor to switch between underwater touch mode and non-underwater touch mode.
[0083] In an embodiment of the present application, the processor 201 can send a switching signal to the touch device 100, so that the touch chip 101 in the touch device 100 outputs a first drive signal to the touch module 102 or outputs a second drive signal to the electrode 401, thereby switching between daily 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.
[0084] The present application also provides a touch device for a mobile phone, which includes: a touch chip and a touch module, the touch module includes a metal button and / or a metal shell of the mobile phone, the touch chip can output a first drive signal to the touch module, the touch module can receive the first drive signal, and when a finger touches the screen, the first drive signal is transmitted to the finger through the human body in contact with the touch module, so that the finger senses the electrode on the touch screen so that the electrode forms a sensing signal, and the touch chip identifies the touch position according to the sensing signal, wherein the electrode includes multiple horizontal electrodes and / or multiple vertical electrodes.
[0085] Specifically, when underwater, the human body comes into contact with the metal buttons and / or metal casing of the mobile phone, for example: Figure 5 (a) in FIG. 1 shows a metal button 1021 of a mobile phone that is touched by a finger. When the finger touches the metal button 1021, the touch module contacts the human body. Figure 6 As shown, the touch module 102, the human body 300 in contact with the touch module 102, the finger 301 and the electrode 401 form a closed loop. The electrode 401 can be a horizontal electrode and / or a vertical electrode. Figure 6The equivalent signal source L1 is the first drive signal received by the touch module 102 (metal button and / or metal shell of the mobile phone), and the capacitor CHT1 is the equivalent capacitance between the finger 301 and the electrode 401. The touch module 102 transmits the first drive signal to the finger 301 through the human body 300. There is mutual inductance between the finger 301 and the electrode 401. Due to the different conductivity of water and the human body 300, and the difference between the equivalent capacitance between water and the electrode 401 and the equivalent capacitance between the finger 300 and the electrode 401, the signal in the closed loop changes, that is, an induction signal is generated. The electrode 401 sends the induction 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 induction signal.
[0086] In an embodiment of the present application, the touch chip outputs a first drive signal to the touch module, and the touch module receives the first drive signal. When a finger touches the touch screen, the touch module transmits the first drive signal to the finger through the human body in contact with the touch module, causing the finger to sense the electrodes on the touch screen, thereby generating a sensing signal at the electrodes. The touch chip then identifies the touch position based on the sensing signal. Thus, the touch chip can identify the touch position based on the sensing signal. Because the sensing signal is generated by a signal that varies based on the different conductivity between water and the human body, and the difference between the equivalent capacitance between water and the electrode and the equivalent capacitance between the finger and the electrode, the generation of the sensing signal is achieved. Therefore, compared with the prior art method of touch position identification based on electrode self-capacitance or mutual capacitance, the touch device is suitable for touch position identification in underwater environments. Therefore, the touch device is suitable for touch position identification in a variety of usage scenarios, allowing the mobile phone to be touched underwater, and thus allowing the mobile phone to be used underwater, with high applicability.
[0087] The present application also provides a touch device for use in a wearable device, the touch device comprising: a touch chip and a touch module, the touch module comprising a metal shell and / or metal electrodes of the wearable device, the touch chip being able to output a first drive signal to the touch module, the touch module being able to receive the first drive signal, and when a finger touches the screen, the first drive signal is transmitted to the finger through a human body in contact with the touch module, so that the finger senses the electrodes on the touch screen so that the electrodes form a sensing signal, and the touch chip identifies the touch position according to the sensing signal, wherein the electrodes comprise a plurality of transverse electrodes and / or a plurality of longitudinal electrodes.
[0088] Wearable devices can be watches, bracelets, and other devices with touch functions that are worn on the human body. The metal electrodes of the wearable devices can be used to detect human biometrics, such as heartbeat and body temperature. The following is an example of a watch. Specifically, when the human body is underwater, the metal casing and / or metal electrodes of the watch come into contact with the wearable device. For example: Figure 5The metal shell 1022 and / or metal electrode 1023 of the watch shown in (b) of FIG. 1 are in contact with the wrist when the watch is worn on the human body. When the finger 301 touches the watch, the touch module 102 is in contact with the human body 300. Figure 6 As shown, the touch module 102, the human body 300 in contact with the touch module 102, the finger 301 and the electrode 401 form a closed loop. The electrode 401 can be a horizontal electrode and / or a vertical electrode. Figure 6 The equivalent signal source L1 is the first drive signal received by the touch module 102, and the capacitor CHT1 is the equivalent capacitance between the finger 301 and the electrode 401. The touch module 102 transmits the first drive signal to the finger 301 through the human body 300. There is mutual inductance between the finger 301 and the electrode 401. Due to the different conductivity of water and the human body 300, and the difference between the equivalent capacitance between water and the electrode 401 and the equivalent capacitance between the finger 300 and the electrode 401, the signal in the closed loop changes, i.e., an induction signal is generated. The electrode 401 sends the induction signal to the touch chip 101 through the pin of the touch chip 101, and the touch chip 101 identifies the touch position based on the induction signal.
[0089] In an embodiment of the present application, the touch chip outputs a first drive signal to the touch module, and the touch module receives the first drive signal. When a finger touches the touch screen, the touch module transmits the first drive signal to the finger through the human body in contact with the touch module, causing the finger to sense the electrodes on the touch screen so that the electrodes form a sensing signal. The touch chip then identifies the touch position based on the sensing signal. Thus, the touch chip can identify the touch position based on the sensing signal. Since a signal that changes based on the different conductivity between water and the human body, and the difference between the equivalent capacitance between water and the electrode and the equivalent capacitance between the finger and the electrode, is used to generate the sensing signal, the touch device can be used for touch position identification in underwater environments, compared to the prior art that uses electrode self-capacitance or mutual capacitance to identify the touch position. Therefore, the touch device can be used for touch position identification in a variety of usage scenarios, allowing the wearable device to be touched underwater, and thus allowing the wearable device to be used underwater, with high applicability.
[0090] It should be understood that the various embodiments in this specification are described in a progressive manner. References to the same or similar parts of the various embodiments will be sufficient. Each embodiment focuses on the differences from the other embodiments. In particular, the method embodiments are generally similar to the methods described in the device and system embodiments, so their description is relatively simple. For relevant details, references to the descriptions of the other embodiments will suffice.
[0091] It should be understood that the foregoing description of this specification is based on specific embodiments. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.
[0092] It should be understood that an element described herein in the singular or shown in the drawings as only one does not limit the number of the element to one. In addition, modules or elements described or shown herein as separate may be combined into a single module or element, and modules or elements described or shown herein as single may be split into multiple modules or elements.
[0093] It should also be understood that the terms and expressions used herein are for descriptive purposes only, and the one or more embodiments of this specification should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or portions thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.
Claims
1. A touch device, characterized in that: include: Touch chip and touch module; The touch control chip is configured to output a first driving signal to the touch control module; The touch module is used to receive the first drive signal. When a finger touches the touch screen, the touch module, the finger, the human body, and the electrodes on the touch screen form a closed loop. The touch module transmits the first drive signal to the closed loop through the human body and the finger in sequence to generate a sensing signal in the closed loop. The touch chip identifies the touch position based on the sensing signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
2. The touch device according to claim 1, wherein: When the touch chip receives a switching signal from a processor in the electronic device, the touch chip stops outputting the first driving signal to the touch module, sends a second driving signal to the electrode, and performs position recognition according to the touch signal output by the electrode.
3. The touch device according to claim 2, wherein: When the electronic device is in underwater mode, the touch chip outputs the first driving signal to the touch module; when the electronic device is in non-underwater mode, the touch chip sends a second driving signal to the electrode.
4. The touch device according to claim 2, wherein: The touch control chip sends the second drive signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and performs position identification based on the touch signal output by the other of the multiple horizontal electrodes and the multiple vertical electrodes, or at least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a drive electrode and a receiving electrode, the touch control chip sends the second drive signal to the drive electrode, and performs position identification based on the touch signal output by the receiving electrode.
5. The touch device according to claim 2, wherein: The touch chip includes: a first switch and a second switch; The first switch is electrically connected to the first pin, one end of the second switch is electrically connected to the first pin, and the other end of the second switch is grounded; When the first switch is closed and the second switch is open, the touch control chip outputs the first driving signal to the touch control module through the first pin; When the first switch is opened and the second switch is closed, the touch control chip stops outputting the first driving signal to the touch control module and sends the second driving signal to the electrode.
6. The touch device according to claim 5, wherein: The touch control device further includes a signal amplification module; The input end of the signal amplifying module is connected to the first pin, and the output end of the signal amplifying module is connected to the touch control module; The signal amplification module is used to perform level amplification processing on the first drive signal and send the amplified first drive signal to the touch module. When the finger touches, the touch module transmits the amplified first drive signal to the closed loop through the human body and the finger in sequence.
7. The touch device according to any one of claims 1 to 6, wherein: The touch module includes a metal button and / or a metal shell of a mobile phone, or the touch module includes a metal shell and / or a metal electrode of a wearable device.
8. The touch device according to claim 1, wherein: 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 configured to identify a touch position according to the identification signal.
9. The touch device according to claim 8, wherein: The current conversion unit includes a transimpedance amplifier, a first resistor, a second resistor, a first feedback resistor, a second feedback resistor, a first capacitor, a second capacitor and an analog-to-digital converter; The first end of the first resistor 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 first capacitor is connected to the first end of the first feedback resistor, the second end of the first capacitor is connected to the second end of the first feedback resistor, the first end of the second capacitor is connected to the first end of the second feedback resistor, and the second end of the second capacitor is connected to the second end of the second feedback resistor; The transimpedance amplifier is 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.
10. The touch device according to claim 9, wherein: The current conversion unit further includes: a low-pass filter; The first input end of the low-pass filter is connected to the negative output end of the transimpedance amplifier, the second input end of the low-pass filter is connected to the positive output end of the transimpedance amplifier, the first output end of the low-pass filter is connected to the first input end of the analog-to-digital converter, and the second output end of the low-pass filter is connected to the second input end of the analog-to-digital converter; The low-pass filter is used to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.
11. The touch device according to claim 10, wherein: The current conversion unit further includes: a sampling and holding module; the sampling and holding module includes a third switch, a fourth switch, a fifth switch, a sixth switch, a third capacitor, and a fourth capacitor; a first end of the third switch is connected to the first output end of the low-pass filter, a second end of the third switch is connected to the first end of the third capacitor and the first end of the fourth switch, a second end of the fourth switch is connected to the first input end of the analog-to-digital converter, and a second end of the third capacitor is grounded; a first end of the fifth switch is connected to the second output end of the low-pass filter, a second end of the fifth switch is connected to the first end of the fourth capacitor and the first end of the sixth switch, a second end of the sixth switch is connected to the second input end of the analog-to-digital converter, and a second end of the fourth capacitor is grounded; the sampling and holding module is used to hold the identification voltage.
12. The touch device according to claim 11, wherein: The current conversion unit further includes a buffer amplifier; a first input terminal of the buffer amplifier is connected to the second terminal of the fourth switch, a second input terminal of the buffer amplifier is connected to the second terminal of the sixth switch, a first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and a second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is used to amplify the identification voltage.
13. A touch chip, characterized in that: The touch chip is used to output a first drive signal to the touch module, and based on the first drive signal received by the touch module, when a finger touches the screen, the touch module, the finger, the human body and the electrodes on the touch screen form a closed loop. The touch module transmits the first drive signal to the closed loop through the human body and the finger in turn, and the touch position is identified based on the induction signal generated in the closed loop, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
14. A display screen module, characterized in that: comprising an electrode and a touch control device as claimed in any one of claims 1 to 12; When a finger touches the screen, the electrodes, the touch module, the human body and the finger form a closed loop, wherein the electrodes include horizontal electrodes and / or vertical electrodes arranged on the touch screen.
15. An electronic device, characterized in that: comprising a processor and the display screen module according to claim 14; The processor is electrically connected to the display screen module; The processor is configured to send a switching signal to the touch control device, so that the touch control chip in the touch control device outputs a first driving signal to the touch control module or outputs a second driving signal to the electrode.
16. A touch device, applied to a mobile phone, characterized in that: The touch device includes: a touch chip and a touch module, and the touch module includes the metal buttons and / or metal shell of the mobile phone; The touch control chip is configured to output a first driving signal to the touch control module; The touch module is used to receive the first drive signal and, when a finger touches the screen, transmit the first drive signal to the finger through a human body in contact with the touch module, so that the finger senses the electrodes on the touch screen so that the electrodes form a sensing signal, and the touch chip identifies the touch position according to the sensing signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.
17. A touch device, applied to a wearable device, characterized in that: The touch control device includes: a touch control chip and a touch control module, and the touch control module includes a metal shell and / or metal electrodes of the wearable device; The touch control chip is configured to output a first driving signal to the touch control module; The touch module is used to receive the first drive signal and, when a finger touches the screen, transmit the first drive signal to the finger through a human body in contact with the touch module, so that the finger senses the electrodes on the touch screen so that the electrodes form a sensing signal, and the touch chip identifies the touch position according to the sensing signal, wherein the electrodes include multiple horizontal electrodes and / or multiple vertical electrodes.