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

Abstract

Embodiments of the present application provide a touch apparatus, a touch chip, a display screen module, and an electronic device. The touch apparatus comprises: a touch chip, wherein the touch chip is configured to output a first driving signal; and a sensing loop, wherein the sensing loop is configured to receive a first excitation signal; when a finger performs a touch operation, the sensing loop, the finger, and an electrode on a touch screen form a closed loop, and a sensing signal is generated in the closed loop; the touch chip performs touch position recognition on the basis of the sensing signal; and the first excitation signal is obtained on the basis of the first driving signal, and the sensing loop is located in the touch screen. The touch apparatus provided in the embodiments of the present application can be applied to touch position recognition in underwater scenarios, and has high applicability.

Description

Touch device, touch chip, display screen module and electronic device TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of electrical engineering, and particularly relate to a touch device, a touch chip, a display screen module and an electronic device. BACKGROUND

[0002] With the development of technology, the integration of electronic devices is high, and more and more electronic devices support IP6X level waterproof. There are many scenarios that require the use of electronic devices underwater, for example, the use of 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 recognize touch instructions. However, since the electrode self-capacitance and / or mutual-capacitance is sensitive to water when recognizing touch instructions, the display screen cannot recognize the touch instructions of the finger when it is covered with water, which causes the existing electronic devices to be unable to be used underwater.

[0003] SUMMARY

[0004] 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.

[0005] According to a first aspect of embodiments of the present application, a touch device is provided, comprising: a touch chip, the touch chip being configured to output a first driving signal; a sensing loop, the sensing loop being configured to receive a first excitation signal, the sensing loop, a finger and an electrode on a touch screen forming a closed loop when the finger touches, and an induced signal being generated in the closed loop, the touch chip being configured to recognize a touch position according to the induced signal, wherein the first excitation signal is obtained according to the first driving signal, and the sensing loop is located in the touch screen.

[0006] According to a second aspect of embodiments of the present application, a touch chip is provided, the touch chip being configured to output a first driving signal, and to recognize a touch position according to an induced signal generated in a closed loop after a sensing loop, a finger and an electrode on a touch screen form the closed loop when the finger touches, and the sensing loop being configured to respond to a first excitation signal, wherein the first excitation signal is obtained according to the first driving signal, and the sensing loop is located in the touch screen.

[0007] According to a third aspect of embodiments of the present application, a display screen module is provided, comprising an electrode and a touch device according to the first aspect of embodiments of the present application; the electrode, the sensing loop and the finger form a closed loop when the finger touches, wherein the electrode comprises a horizontal electrode and / or a vertical electrode arranged on the touch screen.

[0008] According to a fourth aspect of the embodiments of the present application, an electronic device is provided, comprising a processor and the display screen module according to the second aspect of the embodiments of the present application; the processor is electrically connected with 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 the first driving signal to the induction loop or outputs the second driving signal to the electrode.

[0009] According to the touch control device provided by the embodiments of the present application, the touch control chip outputs the first driving signal, the induction loop receives the first excitation signal obtained based on the first driving signal, when the finger touches, the induction loop, the finger and the electrode form a closed loop, at this time, the induction signal can be generated in the closed loop, and thus the touch control chip can identify the touch position according to the induction signal. Since the signal changes due to the difference between the equivalent capacitances between the water and the induction loop, and between the water and the electrode, and the equivalent capacitances between the finger and the induction loop, and between the finger and the electrode, the generation of the induction signal is realized, compared with the touch position identification by the electrode self-capacitance or mutual-capacitance in the prior art, the touch control device can be applied to the touch position identification in the underwater environment, and thus the touch control device can be applied to the touch position identification in various use scenarios, and has high applicability. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0011] Fig. 1 is a schematic diagram of a touch control device provided by the embodiments of the present application;

[0012] Fig. 2 is a schematic diagram of a display screen provided by the embodiments of the present application;

[0013] Fig. 3 is a schematic diagram of a touch control device in a normal mode provided by the embodiments of the present application;

[0014] Fig. 4 is a schematic diagram of an induction loop provided by the embodiments of the present application;

[0015] Fig. 5 is a schematic diagram of an equivalent circuit of a closed loop provided by the embodiments of the present application;

[0016] Fig. 6 is a schematic diagram of a touch control chip provided by the embodiments of the present application;

[0017] Fig. 7 is a schematic diagram of a touch control device comprising a signal amplification module provided by the embodiments of the present application;

[0018] FIG. 8 is a schematic diagram of another touch device according to an embodiment of the present application;

[0019] FIG. 9 is a schematic diagram of a level conversion unit according to an embodiment of the present application;

[0020] FIG. 10 is a schematic diagram of another inductive loop according to an embodiment of the present application;

[0021] FIG. 11 is a schematic diagram of another touch chip according to an embodiment of the present application;

[0022] FIG. 12 is a schematic diagram of yet another touch chip according to an embodiment of the present application;

[0023] FIG. 13 is a schematic diagram of yet another touch device according to an embodiment of the present application;

[0024] FIG. 14 is a schematic diagram of an equivalent circuit of another closed loop according to an embodiment of the present application;

[0025] FIG. 15 is a circuit diagram of a level conversion unit according to an embodiment of the present application;

[0026] FIG. 16 is a schematic diagram of an example of a level conversion unit according to an embodiment of the present application;

[0027] FIG. 17 is a schematic diagram of another example of a level conversion unit according to an embodiment of the present application;

[0028] FIG. 18 is a schematic diagram of a timing of an output voltage according to an embodiment of the present application;

[0029] FIG. 19 is a circuit diagram of yet another level conversion unit according to an embodiment of the present application;

[0030] FIG. 20 is a schematic diagram of a touch screen according to an embodiment of the present application;

[0031] FIG. 21 is a schematic diagram of yet another touch chip according to an embodiment of the present application;

[0032] FIG. 22 is a circuit diagram of a current conversion unit according to an embodiment of the present application;

[0033] FIG. 23 is a circuit diagram of another current conversion unit according to an embodiment of the present application;

[0034] FIG. 24 is a circuit diagram of yet another current conversion unit according to an embodiment of the present application;

[0035] FIG. 25 is a circuit diagram of yet another current conversion unit according to an embodiment of the present application;

[0036] FIG. 26 is a schematic diagram of a display screen module according to an embodiment of the present application;

[0037] FIG. 27 is a schematic diagram of an electronic device according to an embodiment of the present application;

[0038] FIG. 28 is an effect diagram of touch position recognition according to an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the personnel in the art 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 combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art should belong to the scope protected by the embodiments of the present application.

[0040] As described above, with the development of science and technology, the integration of electronic devices is high, and more and more electronic devices support IP6X level waterproof. There are many scenarios that require the use of electronic devices underwater, for example, the use of 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 recognize touch instructions. However, since the electrode self-capacitance and / or mutual-capacitance recognizes touch instructions, it is sensitive to water. When the display screen is covered with water, it cannot recognize the touch instructions of the finger, resulting in that the existing electronic device cannot be used underwater.

[0041] In the embodiments of the present application, a touch device is provided. A touch chip outputs a first driving signal, and a sensing loop receives a first excitation signal obtained based on the first driving signal. When a finger touches, the sensing loop, the finger and the electrode form a closed loop. At this time, an induction signal can be generated in the closed loop. Thus, the touch chip can recognize the touch position according to the induction signal. Since the induction signal is generated according to the change of the equivalent capacitance between the water and the sensing loop, and the equivalent capacitance between the water and the electrode, and the equivalent capacitance between the finger and the sensing loop, and the equivalent capacitance between the finger and the electrode, compared with the touch position recognition by electrode self-capacitance or mutual-capacitance in the prior art, the touch device can be applied to touch position recognition in underwater environment. Therefore, the touch device can be applied to touch position recognition in various use scenarios, and has high applicability.

[0042] The touch device provided by the present application will be described below by way of examples.

[0043] Fig. 1 is a schematic diagram of a touch device according to an embodiment of the present application. As shown in Fig. 1, the touch device 100 includes a touch chip 101 and a sensing loop 102. The touch chip 101 can output a first driving signal, and the sensing loop 102 can receive a first excitation signal. When a finger touches the touch screen, the sensing loop 102, the finger and the electrode 401 on the touch screen form a closed loop, and an induced signal is generated in the closed loop. The touch chip 101 can identify the touch position according to the induced signal. The first excitation signal is obtained according to the first driving signal, and the sensing loop 102 is located in the touch screen.

[0044] The touch device 100 includes the touch chip 101 and the sensing loop 102. Optionally, the touch chip 101 can be electrically connected to the sensing loop 102. The touch chip 101 can output a first driving signal. In an example, the first driving signal can be a voltage signal. The first driving signal can be a signal in a form of a sine wave, a square wave or a trapezoidal wave, etc.

[0045] The sensing loop 102 can receive a first excitation signal obtained based on the driving signal. When the finger touches the touch screen, the finger, the sensing loop 102 and the electrode 401 form a closed loop. Specifically, there is an equivalent capacitance between the finger and the sensing loop 102, and there is an equivalent capacitance between the finger and the electrode 401. Thus, the sensing loop 102, the equivalent capacitance between the finger and the sensing loop 102, the equivalent capacitance between the finger and the electrode 401, and the electrode 401 form a closed loop. Since the sensing loop 102 receives the first excitation signal, an induced signal can be generated in the closed loop. Specifically, when in an underwater environment, there is an equivalent capacitance between the water and the sensing loop 102, and between the water and the electrode 401. Thus, the sensing loop 102, the water and the electrode 401 form a closed loop. When the finger touches the touch screen, the equivalent capacitance between the water and the sensing loop 102, and between the water and the electrode 401 is different from the equivalent capacitance between the finger and the sensing loop 102, and between the finger and the electrode 401. Thus, the signal in the electrode 401 changes, and an induced signal is formed.

[0046] The touch chip 101 is electrically connected to the electrode 401. After receiving the induced signal transmitted by the electrode 401, the touch chip 101 can identify the touch position according to the induced signal. In an example, the touch chip 101 can convert the induced signal into a digital signal, and then send the digital signal to a processor of an electronic device. Thus, the touch position is identified.

[0047] In the embodiment of the present application, the touch chip 101 outputs a first driving signal, the sensing loop 102 receives a first excitation signal obtained based on the first driving signal, and when a finger touches, the sensing loop 102, the finger and the electrode 401 form a closed loop, at this time, an induction signal can be generated in the closed loop, and thus the touch chip 101 can identify the touch position according to the induction signal. Since the equivalent capacitance between water and the sensing loop 102, and the equivalent capacitance between water and the electrode 401 are different from the equivalent capacitance between the finger and the sensing loop 102, and the equivalent capacitance between the finger and the electrode 401, a changed signal is generated, and thus the generation of the induction signal is realized. Compared with the prior art, the touch device 100 can be applied to underwater touch position identification, and thus the touch device 100 can be applied to touch position identification in various use scenarios, and has high applicability.

[0048] In a possible implementation, the sensing loop can perform crack detection on the touch screen.

[0049] The sensing loop can be a coil for performing crack detection on the touch screen before the touch screen is shipped, that is, the sensing loop can be a panel crack detection (PCD) coil. In an example, when performing crack detection on the touch screen, a detection voltage can be input from one end of the PCD coil, the other end is connected to a detection resistor, and then the voltage of the detection resistor is detected. If the voltage of the detection resistor is small, it proves that the touch screen has a crack, and if the voltage of the detection resistor is close to the detection voltage, it proves that the touch screen has no crack.

[0050] In the embodiment of the present application, the sensing loop can perform crack detection on the touch screen, that is, the sensing loop can be a PCD coil for performing crack detection on the touch screen before the touch screen is shipped. Thus, when performing underwater touch detection, the sensing loop and the PCD coil can be shared, and since each touch screen will be subjected to crack detection by the PCD coil when it is shipped, each touch screen will be internally provided with a PCD coil. Thus, when performing underwater touch detection, no additional sensing loop is needed, and the cost of the touch device is reduced.

[0051] In a possible implementation, the sensing loop and the electrode in the touch screen are located in the same layer.

[0052] In an example, FIG. 2 is a schematic diagram of a display screen provided by an embodiment of the present application. As shown in FIG. 2, the touch screen comprises, from bottom to top, a silicon substrate (PI substrate), an array thin film transistor (TFT) layer (Array TFT), an organic light-emitting layer (OLED) (OLED organic layer), a cathode plate, an organic encapsulation layer, a touch electrode layer, a polarizer, and a cover plate. The sensing loop and the electrode are located in the same layer and are both disposed on the organic encapsulation layer. In an example, a plurality of metal strips arranged horizontally and a plurality of metal strips arranged vertically can be deposited on the organic encapsulation layer as electrodes, and a metal wire can be deposited on the organic encapsulation layer to form a sensing loop. In an example, in a direction parallel to the organic encapsulation layer, the minimum distance between the inner edge of the sensing loop and the outer edge of the OLED organic layer is in the range of [175 μm, 195 μm], and the minimum distance between the outer edge of the sensing loop and the outer edge of the organic encapsulation layer is in the range of [830 μm, 870 μm].

[0053] In the embodiment of the present application, the sensing loop and the electrode in the touch screen are located in the same layer, so that the sensing loop can be arranged in the touch screen, and when the finger touches and the sensing loop, the finger and the electrode on the touch screen form a closed loop. Since the sensing loop and the electrode are located in the same layer, the transmission effect of the induction signal is good, the signal quantity of the underwater touch position recognition signal is improved, and therefore the sensitivity and accuracy of underwater touch position recognition can be improved.

[0054] FIG. 3 is a schematic diagram of a touch device in a normal mode provided by an embodiment of the present application. As shown in FIG. 3, when the touch chip 101 receives the switching signal of the processor in the electronic device, the touch chip 101 stops outputting the first driving signal, 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, wherein the electrode 401 comprises a plurality of horizontal electrodes and / or a plurality of vertical electrodes.

[0055] When the touch chip 101 receives the switching signal sent by the processor, the underwater touch mode is switched to the normal touch mode, and the touch chip 101 stops outputting the first driving signal. At this time, the sensing loop 102 cannot receive the first excitation signal obtained based on the first driving signal, the touch chip 101 outputs the second driving signal to the electrode 401, and the second driving signal can be a signal in a sine wave form, a signal in a square wave form, or a signal in a trapezoidal wave form, etc. When the electrode 401 receives the second driving signal, an induction signal is generated, and the touch chip 101 performs touch position recognition according to the induction signal.

[0056] It should be understood that, as shown in FIG. 3, the plurality of electrodes 401 includes a plurality of transverse electrodes and / or a plurality of longitudinal electrodes, and the touch control chip 101 is electrically connected with each electrode 401, and when the plurality of transverse electrodes and / or the plurality of longitudinal electrodes generate an induced signal, the touch control chip 101 can detect the induced signal generated in the plurality of transverse electrodes and / or the plurality of longitudinal electrodes.

[0057] In the embodiment of the present application, when the touch control chip 101 receives the switching signal, the touch control chip 101 stops outputting the first driving signal and outputs the second driving signal to the electrode 401, thereby being applicable to touch position recognition in daily use scenarios. Since the conventional touch mode and the underwater touch mode are switched according to the switching signal, the touch position recognition can be applicable to daily scenarios and underwater scenarios, and can be applicable to touch position recognition in various use scenarios, and has high applicability.

[0058] In a possible implementation, when the electronic device is in the underwater mode, the touch control chip 101 outputs the first driving signal, and when the electronic device is in the non-underwater mode, the touch control chip 101 sends the second driving signal to the electrode 401.

[0059] When the electronic device is in the underwater mode, the touch control chip 101 outputs the first driving signal, and the sensing loop 102 receives the first excitation signal obtained according to the first driving signal. There is an equivalent capacitance between the water and the sensing loop 102, and between the water and the electrode 401, so that the sensing loop 102, the water and the electrode 401 form a closed loop, and a signal is generated at the electrode 401. When a finger touches, the equivalent capacitance between the water and the sensing loop 102, and between the water and the electrode 401 is different from the equivalent capacitance between the finger and the sensing loop 102, and between the finger and the electrode 401, so that the signal in the electrode 401 changes, forming an induced signal.

[0060] When the electronic device is in the non-underwater mode, the touch control chip 101 outputs the first driving signal, at which time the sensing loop 102 cannot receive the first excitation signal obtained based on the first driving signal, and the sensing loop 102 stops sensing. Then, the touch control chip 101 outputs the second driving signal to the electrode 401. The second driving signal can be a signal in a sine wave form, a signal in a square wave form, or a signal in a trapezoidal wave form, etc. When the electrode 401 receives the second driving signal, an induced signal is generated, and the touch control chip 101 performs touch position recognition according to the induced signal.

[0061] In an 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 control chip 101, to realize switching between the underwater mode and the non-underwater mode.

[0062] In the embodiment of the present application, when the electronic device is in the underwater mode, the touch control chip 101 outputs the first driving signal, and when the electronic device is in the non-underwater mode, the sensing loop 101 sends the second driving signal to the electrode 401, so that the electronic device can realize the switching between the underwater mode and the non-underwater mode, and thus the touch control device can be suitable for touch position recognition in daily scenes and underwater scenes, can be suitable for touch position recognition in various use scenes, and has high applicability.

[0063] In a possible implementation, the touch control chip 101 sends the second driving signal to one of the plurality of horizontal electrodes and the plurality of longitudinal electrodes, and performs position recognition according to a touch signal output by the other of the plurality of horizontal electrodes and the plurality of longitudinal electrodes.

[0064] One of the plurality of horizontal electrodes and the plurality of longitudinal electrodes is used as a driving electrode, the touch control chip 101 outputs a driving signal to the driving electrode, the other of the plurality of horizontal electrodes and the plurality of longitudinal electrodes is used as a receiving electrode, a sensing signal is output, and the touch control chip 101 performs touch recognition according to the sensing signal, so that the touch position of the finger can be recognized. This mode is a mutual capacitance detection mode.

[0065] In addition, in another possible implementation, the touch position of the finger can also be recognized by superimposing a self-capacitance detection mode. At least one of the plurality of horizontal electrodes and the plurality of longitudinal electrodes is used as both a driving electrode and a receiving electrode, the touch control chip 101 sends a driving signal to the driving electrode, and performs position recognition according to a sensing signal output by the receiving electrode. For example, the touch control chip 101 outputs a driving signal to the plurality of horizontal electrodes (driving electrodes), and simultaneously receives a sensing signal output by the plurality of horizontal electrodes (receiving electrodes); or the touch control chip 101 outputs a driving signal to the plurality of longitudinal electrodes (driving electrodes), and simultaneously receives a sensing signal output by the plurality of longitudinal electrodes (receiving electrodes); or the touch control chip 101 simultaneously outputs driving signals to the plurality of horizontal electrodes and the plurality of longitudinal electrodes, and simultaneously receives sensing signals output by the plurality of horizontal electrodes and the plurality of longitudinal electrodes, and the touch control chip 101 performs touch position recognition according to the received sensing signals.

[0066] In the embodiment of the present application, when the touch control chip 101 receives the switching signal, the touch control chip stops outputting the first driving signal and outputs the second driving signal to the electrode 401, so that the electrode 401 can perform touch position recognition in a self-capacitance or mutual-capacitance mode, can be suitable for touch position recognition in daily use scenes, and can be suitable for touch position recognition in daily scenes and underwater scenes due to switching between the daily scenes and the underwater scenes according to the switching signal. The touch control device 100 can be suitable for touch position recognition in various use scenes, and has high applicability.

[0067] Fig. 4 is a schematic diagram of a sensing loop according to an embodiment of the present application. As shown in Fig. 4, the sensing loop 102 is connected to the first pin 10111 of the touch chip 101, and the excitation signal is the first driving signal. The sensing loop 102 can receive the first driving signal. When the finger touches, the sensing loop 102, the finger and the electrode 401 form a closed loop, and the first driving signal is transmitted in the closed loop to generate an induced signal.

[0068] The sensing loop 102 is electrically connected to the first pin 10111 of the touch chip 101. The sensing loop 102 can receive the first driving signal output by the touch chip 101 through the first pin 10111, and the first driving signal is used as the first excitation signal. It should be understood that, since the underwater touch recognition mode is used to recognize the touch position under water, there is an equivalent capacitance between the sensing loop 102 and water, and between water and the electrode 401, forming a closed loop. Since the sensing loop 102 receives the first driving signal sent by the touch chip 101, a signal can be generated in the closed loop.

[0069] Fig. 5 is a schematic diagram of an equivalent circuit of a closed loop according to an embodiment of the present application. As shown in Fig. 5, when the finger 300 touches, the sensing loop 102, the finger 300 and the electrode 401 form a closed loop. The electrode 401 can be a horizontal electrode and / or a vertical electrode. The equivalent signal source L1 in Fig. 5 is the received first excitation signal, such as the first driving signal in the embodiment of the present application. The capacitance CHM1 is the equivalent capacitance between the finger 300 and the sensing loop 102. The capacitance CHT1 is the equivalent capacitance between the finger 300 and the electrode 401. Since the equivalent capacitances between water and the sensing loop 102, and between water and the electrode 401 are different from the equivalent capacitances between the finger 300 and the sensing loop 102, and between the finger 300 and the electrode 401, the signal in the closed loop changes, i.e., an induced signal is generated. The electrode 401 sends the induced signal to the touch chip 101 through the pin of the touch chip 101. The touch chip 101 recognizes the touch position according to the induced signal.

[0070] In an example, when the touch chip 101 recognizes the touch position according to the induced signal, the Y-axis coordinate of the touch position can be obtained by detecting the induced signal generated by the horizontal electrode first, and then the X-axis coordinate of the touch position can be obtained by detecting the induced signal generated by the vertical electrode. Alternatively, the X-axis coordinate of the touch position can be detected first, and then the Y-axis coordinate of the touch position can be detected. In another example, the touch chip 101 can simultaneously detect the induced signals generated by the horizontal electrode and the vertical electrode, and 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 induced signal generated by the horizontal electrode or the vertical electrode, i.e., only detect the X-axis coordinate or the Y-axis coordinate of the touch position. This can be applied to a scene with low detection accuracy requirement. The specific detection method can be set as required, and is not limited herein.

[0071] In the embodiment of the present application, the sensing loop 102 is connected with the first pin 10111 of the touch chip 101, so that the sensing loop 102 can receive the first driving signal output by the touch chip 101 through the first pin 10111. When the finger 300 touches, the sensing loop 102, the finger 300 and the electrode 401 form a closed loop, and the first driving signal is transmitted in the closed loop to generate an induced signal, so as to realize the touch position recognition under water. Since the changed signal is generated due to the difference between the equivalent capacitances between the water and the sensing loop 102, and between the water and the electrode 401, and the equivalent capacitances between the finger 300 and the sensing loop 102, and between the finger 300 and the electrode 401, the generation of the induced signal is realized. Compared with the self-capacitance or mutual-capacitance scheme in the prior art which can only be used in daily scenarios to perform touch recognition, the touch device 100 can be applied to touch recognition in underwater environment, so that the touch device 100 can be applied to touch recognition in various use scenarios, and has high applicability.

[0072] FIG. 6 is a schematic diagram of a touch chip according to an embodiment of the present application. As shown in FIG. 6, the touch chip 101 includes a first switch K1 and a second switch K2. The first switch K1 is electrically connected with the first pin 10111. One end of the second switch K2 is connected with the first pin 10111, 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 touch chip 101 outputs the first driving signal to the sensing loop 102. When the first switch K1 is opened and the second switch K2 is closed, the touch chip 101 stops outputting the first driving signal to the sensing loop 102, and sends the second driving signal to the electrode 401.

[0073] The touch chip 101 includes the first switch K1 and the second switch K2. The first switch K1 is arranged between the first signal generator 1012 and the first pin 10111. One end of the first pin 10111 is connected with the first switch K1, and the other end of the first pin 10111 is electrically connected with the sensing loop 102. One end of the second switch K2 is connected with the first pin 10111, 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 first signal generator 1012 in the touch chip 101 generates the first driving signal, which is transmitted to the first pin 10111 through the closed first switch K1. The first pin 10111 sends the first driving signal to the sensing loop 102 electrically connected with the first pin 10111, so that the touch position recognition can be performed in underwater scenarios.

[0074] When the second switch K2 is closed, the sensing loop 102 is grounded through the first pin 10111 and the closed second switch K2, at this time the sensing loop 102 is short-circuited by the ground wire, the touch chip 101 stops outputting the first driving signal to the sensing loop 102, it should be understood that when the second switch K2 is closed, in order to prevent the touch chip 101 from leaking to the ground wire, at this time the first switch K1 will be turned off, the touch chip 101 stops outputting the first driving signal to the sensing loop 102 and outputs the second driving signal to the electrode 401, so that the touch position recognition can be performed in the daily scene.

[0075] In the embodiment of the present application, the touch chip 101 includes the first switch K1 and the second switch K2, when the first switch K1 is closed and the second switch K2 is turned off, the touch chip 101 outputs the first driving signal to the sensing loop 102, when the first switch K1 is turned off and the second switch K2 is closed, the touch chip 101 sends the second driving signal to the electrode 401, thereby realizing switching between the underwater touch recognition mode and the daily touch recognition mode, since the touch chip 101 can control the on-off of the first switch K1 and the second switch K2 according to the switching signal sent by the processor, the touch position recognition can be performed in the daily scene and the underwater scene, the touch device 100 can be applied to the touch position recognition in various use scenes, and the applicability is high.

[0076] FIG. 7 is a schematic diagram of a touch device including a signal amplification module according to an embodiment of the present application, as shown in FIG. 7, the touch device 100 further includes a signal amplification module 103, the input end of the signal amplification module 103 is connected with the first pin 10111, the output end of the signal amplification module 103 is connected with the sensing loop 102, the signal amplification module 103 can perform the level amplification processing on the first driving signal and send the amplified first driving signal to the sensing loop 102, so that the sensing loop 102 transmits the amplified first driving signal in the closed loop.

[0077] 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 output by the touch chip 101 through the first pin 10111, then performs signal amplification processing on the first drive signal, and sends the signal-amplified first drive signal to the sensing loop 102, so that the sensing loop 102 can generate a sensing signal based on the signal-amplified first drive signal, that is, the signal-amplified first drive signal is used as a first excitation signal to generate a sensing signal. In an example, the difference between the peak and the trough of the first drive signal before signal amplification ranges from [1Vpp, 10Vpp], that is, the difference between the high level and the low level ranges from 1Vpp to 10Vpp, and the difference between the peak and the trough of the first drive signal after signal amplification processing ranges from [1Vpp, 30Vpp], that is, the difference between the high level and the low level ranges from 1Vpp to 30Vpp.

[0078] In the embodiment of the present application, the signal amplification module 103 is further included in the touch device 100, so that the signal amplification processing can be performed on the first drive signal output by the touch chip 101, and the signal amplitude of the first drive signal can be increased, so that the first drive signal with a larger signal amplitude can be transmitted in the closed loop, the signal amplitude of the generated sensing signal is larger, and the sensitivity of the touch device 100 in identifying the touch position is improved.

[0079] FIG. 8 is a schematic diagram of another touch device provided by an embodiment of the present application. As shown in FIG. 8, the touch device 100 further includes a level conversion unit 104. The input pin 1041 of the level conversion unit 104 is electrically connected with the second pin 10112 of the touch chip 101. The first output pin 1042 of the level conversion unit 104 is electrically connected with the ground pin 10113 of the touch chip 101. The second output pin 1043 of the level conversion unit 104 is connected with the power supply pin 10114 of the touch chip 101. The level conversion unit 104 can receive the first drive signal output by the touch chip 101 through the second pin 10112, generate a third drive signal according to the first drive signal, and transmit a power supply voltage to the touch chip 101 through the power supply pin 10114. The voltage difference between the power supply voltage and the third drive signal is equal to the power supply voltage of the touch chip 101.

[0080] The level conversion unit 104 can receive the first drive signal output by the touch chip 101 through the second pin 10112 through the input pin 1041. In an example, the first drive 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 drive signal, the level conversion unit 104 generates a third drive signal according to the first drive signal.

[0081] After the level conversion unit 104 generates the third driving signal, the third driving signal is sent to the ground pin 10113 of the touch chip 101 through the first output pin 1042, at this time, the voltage of the ground pin 10113 of the touch chip 101 is the third driving signal, instead of 0, the second output pin 1043 of the level conversion unit 104 transmits the power supply voltage to the power supply pin 10114 of the touch chip 101, and the voltage difference between the power supply pin 10114 and the ground pin 10113 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 third driving signal is equal to the power supply voltage of the touch chip 101.

[0082] In an example, the power supply voltage fluctuates according to the voltage fluctuation of the third driving signal, and the voltage difference between the power supply voltage and the third driving signal is constant at 3V, for example: when the third driving signal is a low-level signal 0V, the power supply voltage is 3V, when the third driving signal is a high-level signal 12V, the power supply voltage is 15V, and the voltage difference between the power supply voltage and the third driving signal is constant at 3V.

[0083] In an example, FIG. 9 is a schematic diagram of a level conversion unit provided by an embodiment of the present application, as shown in FIG. 9, the level conversion unit 104 can include a communication unit 1044, the communication unit 1044 can be electrically connected with the communication pin 10115 in the touch chip 101, for example: electrically connected with the SPI pin in the touch chip, the touch chip 101 can communicate with the level conversion unit 104 through the communication pin 10115, and set the level conversion unit 104, etc. Operation, and the communication unit 1044 can send the communication signal output by the touch chip 101 to the processor in the electronic device after voltage reduction processing, for example: send the touch position coordinate signal output by the touch chip 101 to the processor in the electronic device after voltage reduction processing, it should be understood that, since the level conversion unit 104 generates the third driving signal and sends the third driving signal to the ground pin 10113 of the touch chip 101, therefore, the reference voltage of the ground pin 10113 of the touch chip 101 is not the 0V of the ground, but the third driving signal, when the third driving 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 10113 is higher, for example: when the ground pin 10113 of the touch chip 101 is 0V, the touch position coordinate signal output by the touch chip 101 is 3V, when the ground pin 10113 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 send the voltage of the communication signal sent by the touch chip 101 to the processor after reducing, for example: reduce the 13V communication signal to a 3V communication signal, to prevent the processor from being damaged by high voltage.

[0084] In the embodiment of the present application, the sensing loop 102 comprises a level conversion unit 104, which generates a third driving signal according to the first driving signal after receiving the first driving signal, so as to pull up the voltage of the ground pin 10113 of the touch chip, and the power supply pin 10114 transmits the power voltage to the touch chip 101, so as to keep the power voltage of the touch chip 101 unchanged when the voltage of the ground pin 10113 of the touch chip 101 is the third driving signal output by the level conversion unit 104, thereby ensuring the stable power supply of the touch chip 101 and enabling the touch chip 101 to work normally.

[0085] FIG. 10 is a schematic diagram of another sensing loop provided by the embodiment of the present application. As shown in FIG. 10, the sensing loop 102 is connected with the third pin 10116 of the touch chip 101, and the touch chip 101 can generate a first excitation signal based on the third driving signal and transmit the first excitation signal to the sensing loop 102 through the third pin 10116.

[0086] Similar to the communication signal in the above embodiment, since the reference voltage of the ground pin 10113 of the touch chip 101 is the third driving signal, the touch chip 101 generates the first excitation signal based on the third driving signal, and the first excitation signal can be a signal of a sine wave, a signal of a square wave, a signal of a trapezoidal wave, and the like. For example, before the ground pin 10113 of the touch chip 101 is suspended, i.e., the reference voltage of the ground pin 10113 is 0V, the touch chip 101 generates the first excitation signal of 0V-3V periodically, i.e., the difference between the high level and the low level of the first excitation signal is 3Vpp. When the ground pin 10113 of the touch chip 101 is suspended, i.e., the reference voltage of the ground pin 10113 is the third driving signal, taking the square wave signal of 0V-12V as an example, when the third driving signal is 12V, the touch chip 101 generates the first excitation signal of 15V based on the reference voltage of 12V, so the touch chip 101 can generate the first excitation signal of 0V-15V periodically, i.e., the difference between the high level and the low level of the first excitation signal is 15Vpp, thereby obtaining the first excitation signal with a larger signal amplitude.

[0087] An equivalent circuit diagram is shown in FIG. 5. When the finger 300 performs touch control, the sensing loop 102 forms a closed loop with the finger 300 and the electrode 401, which can be a transverse electrode and / or a longitudinal electrode. In FIG. 5, the equivalent signal source L1 is the received first excitation signal, the capacitance CHM1 is the equivalent capacitance between the finger 300 and the sensing loop 102, and the capacitance CHT1 is the equivalent capacitance between the finger 300 and the electrode 401. Since the equivalent capacitances between the water and the sensing loop 102 and between the water and the electrode 401 are different from the equivalent capacitances between the finger 300 and the sensing loop 102 and between the finger 300 and the electrode 401, the signal in the closed loop changes, i.e., an induced signal is generated. The electrode 401 sends the induced signal to the touch control chip 101 through a pin of the touch control chip 101, and the touch control chip 101 performs touch position recognition according to the induced signal.

[0088] In the embodiment of the present application, the sensing loop 102 is connected to the third pin 10116 of the touch control chip 101. The touch control chip 101 can generate the first excitation signal based on the third driving signal and transmit the first excitation signal to the sensing loop 102 through the third pin 10116. Thus, the first excitation signal with a larger signal amplitude can be transmitted in the closed loop, the induced signal generated in the closed loop has a larger signal amplitude, and the sensitivity of the touch control device 100 in recognizing the touch position is improved.

[0089] FIG. 11 is a schematic diagram of another touch control chip provided in the embodiment of the present application. As shown in FIG. 11, the touch control chip 101 includes a third switch K3 and a fourth switch K4. The third switch K3 is electrically connected to the second pin 10112 of the touch control chip 101. One end of the fourth switch K4 is electrically connected to the second pin 10112, and the other end of the fourth switch K4 is grounded. When the third switch K3 is closed and the fourth switch K4 is opened, the touch control chip 101 outputs the first driving signal to the level conversion unit 104. When the third switch K3 is opened and the fourth switch K4 is closed, the touch control chip 101 stops outputting the first driving signal to the level conversion unit 104.

[0090] The third switch K3 is arranged between the second signal generator 1013 and the second pin 10112, one end of the second pin 10112 is connected with the third switch K3, the other end of the second pin 10112 is electrically connected with the level conversion unit 104, one end of the fourth switch K4 is connected with the second pin 10112, the other end of the fourth switch K4 is grounded, when the third switch K3 is closed and the fourth switch K4 is disconnected, the second signal generator 1013 in the touch chip 101 generates the first driving signal, and then transmits the first driving signal to the second pin 10112 through the closed third switch K3, and the second pin 10112 sends the first driving signal to the level conversion unit 104 electrically connected with the second pin 10112, so that the touch position recognition can be performed in the underwater scene.

[0091] When the fourth switch K4 is closed, the level conversion unit 104 is grounded through the second pin 10112 and the closed fourth switch K4, at this time, the touch chip 101 stops outputting the first driving signal to the level conversion unit 104, and it should be understood that when the fourth switch K4 is closed, in order to prevent the touch chip 101 from leaking to the ground, the third switch K3 will be disconnected at this time, and the touch chip 101 stops outputting the first driving signal to the level conversion unit 104 and outputs the second driving signal to the electrode 401, so that the touch position recognition can be performed in the daily scene.

[0092] In the embodiment of the application, the touch chip 101 includes the third switch K3 and the fourth switch K4, when the third switch K3 is closed and the fourth switch K4 is disconnected, the touch chip 101 outputs the first driving signal to the level conversion unit 104, thereby the third driving signal can be generated through the level conversion unit 104, and the touch position recognition in the underwater scene is realized, when the third switch K3 is disconnected and the fourth switch K4 is closed, the touch chip 101 stops outputting the first driving signal to the level conversion unit 104 and sends the second driving signal to the plurality of electrodes 401, thereby the touch position recognition can be performed through the self-capacitance or mutual-capacitance of the plurality of electrodes 401, and the touch position recognition in the daily scene is realized, the touch chip 101 can control the on-off of the third switch K3 and the fourth switch K4 according to the switching signal sent by the processor, and switching between the underwater touch recognition mode and the daily touch recognition mode is realized, so that the touch position recognition can be performed in the daily scene and the underwater scene, the touch device 100 can be applied to the touch position recognition in a variety of use scenarios, and the applicability is high.

[0093] Fig. 12 is a schematic diagram of another touch chip according to an embodiment of the present application. As shown in Fig. 12, the touch chip 101 includes a fifth switch K5 and a sixth switch K6. The fifth switch K5 is electrically connected to the third pin 10116 of the touch chip 101. One end of the sixth switch K6 is electrically connected to the third pin 10116. The other end of the sixth switch K6 is grounded. When the fifth switch K5 is closed and the sixth switch K6 is open, the touch chip 101 outputs the first excitation signal to the sensing loop 102. When the fifth switch K5 is open and the sixth switch K6 is closed, the touch chip 101 stops outputting the first excitation signal to the sensing loop 102.

[0094] The touch chip 101 further includes the fifth switch K5 and the sixth switch K6. For the scheme in which the touch chip 101 outputs the first excitation signal to the sensing loop 102 as shown in Fig. 10, the fifth switch K5 is arranged between the third signal generator 1014 and the third pin 10116. One end of the third pin 10116 is connected to the fifth switch K5. The other end of the third pin 10116 is electrically connected to the sensing loop 102. One end of the sixth switch K6 is connected to the third pin 10116. The other end of the sixth switch K6 is grounded. When the fifth switch K5 is closed and the sixth switch K6 is open, the third signal generator 1014 in the touch chip 101 generates the first excitation signal based on the third driving signal, and then transmits the first excitation signal to the third pin 10116 through the closed fifth switch K5. The third pin 10116 sends the first excitation signal to the sensing loop 102 electrically connected to the third pin 10116, so that the touch position can be recognized in an underwater scene.

[0095] When the sixth switch K6 is closed, the sensing loop 102 is grounded through the third pin 10116 and the closed sixth switch K6. At this time, the sensing loop 102 is short-circuited by the ground wire, and the touch chip 101 stops outputting the first excitation signal to the sensing loop 102. It should be understood that when the sixth switch K6 is closed, in order to prevent the touch chip 101 from leaking to the ground wire, the fifth switch K5 will be open at this time. After the touch chip 101 stops outputting the first excitation signal to the sensing loop 102, the second driving signal is output to the electrode 401, so that the touch position can be recognized in a daily scene.

[0096] In the embodiment of the present application, the touch chip 101 includes a fifth switch K5 and a sixth switch K6. When the fifth switch K5 is closed and the sixth switch K6 is opened, the touch chip 101 outputs a first excitation signal to the sensing loop 102, so as to realize touch position recognition in an underwater scene. When the fifth switch K5 is opened and the sixth switch K6 is closed, the touch chip 101 sends a second driving signal to the electrode 401, so as to realize touch position recognition in a daily scene. The touch chip 101 can control the on-off of the fifth switch K5 and the sixth switch K6 according to the switching signal sent by the processor, so as to switch between the underwater touch recognition mode and the daily touch recognition mode. Therefore, the touch device 100 can be applicable to touch position recognition in daily scenes and underwater scenes, and has high applicability.

[0097] FIG. 13 is a schematic diagram of another touch device provided by an embodiment of the present application. As shown in FIG. 13, the sensing loop 102 is electrically connected with the first output pin 1042, and the excitation signal is a third driving signal. The sensing loop 102 can receive the third driving signal. When the finger 300 performs touch, the sensing loop 102, the finger 300 and the electrode 401 form a closed loop, and the third driving signal is transmitted in the closed loop to generate an induced signal.

[0098] The third driving signal is a square wave signal generated by the level conversion unit 104 according to the first driving signal. The sensing loop 102 is electrically connected with the first output pin 1042 of the level conversion unit 104. The level conversion unit 104 sends the third driving signal to the sensing loop 102 through the first output pin 1042. The equivalent circuit diagram is shown in FIG. 5. When the finger 300 performs touch, the sensing loop 102, the finger 300 and the electrode 401 form a closed loop. The electrode 401 can be a horizontal electrode and / or a vertical electrode. The equivalent signal source L1 in FIG. 5 is the received first excitation signal, such as the third driving signal in the embodiment of the present application. The capacitance CHM1 is the equivalent capacitance between the finger 300 and the sensing loop 102. The capacitance CHT1 is the equivalent capacitance between the finger 300 and the electrode 401. Since the equivalent capacitances between water and the sensing loop 102 and between water and the electrode 401 are different from the equivalent capacitances between the finger 300 and the sensing loop 102 and between the finger 300 and the electrode 401, the signal in the closed loop changes, i.e., an induced signal is generated. The electrode 401 sends the induced signal to the touch chip 101 through the pin of the touch chip 101. The touch chip 101 performs touch position recognition according to the induced signal.

[0099] In the embodiment of the present application, the sensing loop 102 is electrically connected with the first output pin 1042, so that the level conversion unit 104 can output the third driving signal generated according to the first driving signal as the first excitation signal to the sensing loop 102, so that the underwater touch position recognition can be performed through the sensing loop 102. Compared with the scheme in which the touch chip 101 generates the first excitation signal based on the third driving signal in the above embodiment, the signal generator does not need to be additionally arranged in the touch chip 101, so the cost is lower.

[0100] In a possible implementation, the fourth pin of the touch chip 101 is connected with the electrode 401, and the touch chip 101 can output the second excitation signal to the electrode 401 according to the third driving signal. The electrode 401 is used to receive the second excitation signal. When the finger 300 performs touch, the sensing loop 102 forms a closed loop with the finger 300 and the electrode 401, and the second excitation signal and the first excitation signal are transmitted in the closed loop to generate the induction signal.

[0101] The fourth pin of the touch chip 101 is connected with the electrode 401, and the touch chip 101 generates the second excitation signal according to the third driving signal. The second excitation signal can be a signal in a sine wave form, a signal in a square wave form, a signal in a trapezoidal wave form, and the like. The generation principle of the second excitation signal is similar to that of the first excitation signal, which will not be described herein again.

[0102] After the touch chip 101 generates the second excitation signal, the second excitation signal is sent to the electrode 401. When the finger 300 performs touch, the sensing loop 102 forms a closed loop with the finger 300 and the electrode 401. At this time, because the sensing loop 102 receives the first excitation signal from the touch chip 101 or the level conversion unit 104 (as shown in FIG. 10 or FIG. 13), and the electrode 401 receives the second excitation signal from the touch chip 101, the first excitation signal and the second excitation signal are transmitted in the closed loop to generate the induction signal.

[0103] Fig. 14 is a schematic view of an equivalent circuit diagram of another closed loop provided in an embodiment of the present application. As shown in Fig. 14, when the finger 300 performs touch control, the sensing loop 102 forms a closed loop with the finger 300 and the electrode 401, which can be a transverse electrode and / or a longitudinal electrode. The equivalent signal source L1 is the received first excitation signal, and the equivalent signal source L2 is the received second excitation signal. The capacitance CHM1 is the equivalent capacitance between the finger 300 and the sensing loop 102, and the capacitance CHT1 is the equivalent capacitance between the finger 300 and the electrode 401. Since the equivalent capacitances between the water and the sensing loop 102 and between the water and the electrode 401 are different from the equivalent capacitances between the finger 300 and the sensing loop 102 and between the finger 300 and the electrode 401, the signals in the closed loop change, i.e., an induced signal is generated. The electrode 401 sends the induced signal to the touch control chip 101 through the pin of the touch control chip 101, and the touch control chip 101 performs touch position recognition according to the induced signal.

[0104] It should be understood that although the electrode 401 is sensitive to water when recognizing touch control instructions by self-capacitance and / or mutual-capacitance, since the second excitation signal in the electrode 401 is only a supplementary signal in the closed loop, and since the second excitation signal is generated based on the third driving signal on the ground pin 10113 rather than 0V, the signal amplitude of the second excitation signal is large, which can cause the electrode 401 to generate a certain induced signal, thereby serving as a supplement in the closed loop, so that the signal amount and signal amplitude of the induced signal output by the electrode 401 are large.

[0105] In the embodiment of the present application, the plurality of fourth pins of the touch control chip 101 are connected with the electrode 401, and the touch control chip 101 can output the second excitation signal to the electrode 401 according to the third driving signal, so that the second excitation signal can be transmitted in the closed loop, and since the sensing loop 102 receives the first excitation signal, the first excitation signal and the second excitation signal are simultaneously transmitted in the closed loop, so that the signal amplitude of the induced signal generated in the closed loop is large, and the sensitivity of the touch control device 100 in recognizing the touch position is improved.

[0106] In a possible implementation, as shown in Figs. 2 to 14, the sensing loop 102 includes a first sensing loop 1021 and a second sensing loop 1022. The first end of the first sensing loop 1021 and the first end of the second sensing loop 1022 receive the first excitation signal. The second end of the first sensing loop 1021 is connected with the second end of the second sensing loop 1022.

[0107] The first end of the first sensing loop 1021 and the first end of the second sensing loop 1022 can be connected with one of the first output pin 1042 of the level conversion unit 104, the first pin 10111 of the touch chip 101 and the third pin 10116 of the touch chip 101 to receive the first excitation signal, and the second ends of the first sensing loop 1021 and the second sensing loop 1022 are connected.

[0108] Taking the equivalent circuit diagrams shown in FIG. 5 and FIG. 14 as examples, when the finger 300 touches from the left side in FIG. 5 and FIG. 14, the first sensing loop 1021, the finger 300 and the electrode 401 form a closed loop, when the finger 300 touches from the right side in FIG. 5 and FIG. 14, the second sensing loop 1022, the finger 300 and the electrode 401 form a closed loop, and the specific generation principle of the induced signal is similar to the principle in the above-mentioned embodiments, which will not be described here.

[0109] In the embodiments of the present application, the sensing loop includes the first sensing loop 1021 and the second sensing loop 1022, the first end of the first sensing loop 1021 and the first end of the second sensing loop 1022 receive the first excitation signal, thereby preventing signal loss of the first excitation signal in the sensing loop, compared with setting one sensing loop, since the signal loss of the induced signal is larger when the induced signal is transmitted in one sensing loop, therefore, setting the first sensing loop 1021 and the second sensing loop 1022 can improve the signal strength of the first excitation signal in the sensing loop, so that the signal strength of the induced signal generated in the closed loop is higher, and the sensitivity of the touch detection device in underwater touch position recognition can be improved.

[0110] FIG. 15 is a circuit diagram of a level conversion unit according to an embodiment of the present application, as shown in FIG. 15, the level conversion unit 104 includes N sub-circuits, N is an integer greater than or equal to 2, the first sub-circuit in the N sub-circuits includes the seventh switch K7, the eighth switch K8 and the first capacitor C1, the first end of the seventh switch K7 is connected with the power supply AVDD, the second end of the seventh switch K7 is connected with the second output pin 1043, the first end of the first capacitor C1 is connected with the second output pin 1043, the second end of the first capacitor C1 is respectively connected with the first end of the eighth switch K8 and the first output pin 1042, and the second end of the eighth switch K8 is grounded.

[0111] The i-th sub-circuit of the N sub-circuits comprises a ninth switch K9, a tenth switch K10, an eleventh switch K11 and a second capacitor C2, a first end of the ninth switch K9 is connected with the power supply AVDD, a second end of the ninth switch K9 is connected with a first end of the tenth switch K10, a second end of the tenth switch K10 is connected with a second end of the capacitor in the i-1-th sub-circuit, a first end of the second capacitor C2 is connected with the second end of the ninth switch K9, a second end of the second capacitor C2 is connected with a first end of the eleventh switch K11, a second end of the eleventh switch K11 is grounded, wherein i is an integer greater than 1 and less than N.

[0112] The N-th sub-circuit of the N sub-circuits comprises a twelfth switch K12, a first end of the twelfth switch K12 is connected with the power supply AVDD, a second end of the twelfth switch K12 is connected with the second end of the capacitor in the N-1-th sub-circuit;

[0113] The level conversion unit 104 is configured to control the on-off of the switches in the N sub-circuits according to the first driving signal, so that the on-off states of the seventh switch K7, the eighth switch K8, the ninth switch K9 and the eleventh switch K11 are the same, the on-off states of the tenth switch K10 and the twelfth switch K12 are the same, the on-off states of the seventh switch K7 and the twelfth switch K12 are opposite, when the seventh switch K7 is closed, a low level of the third driving signal is generated at the first output pin 1042, when the twelfth switch K12 is closed, a high level of the third driving 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.

[0114] The level conversion unit 104 controls the on-off of the switches in the N sub-circuits according to the first driving signal, in an example, when the first driving signal is at a first level, the seventh switch K7, the eighth switch K8, the ninth switch K9 and the eleventh switch K11 are closed, and the tenth switch K10 and the twelfth switch K12 are open, at this time, each capacitor in the circuit is charged by the power supply AVDD, when the first driving signal is at a second level, the seventh switch K7, the eighth switch K8, the ninth switch K9 and the eleventh switch K11 are open, and the tenth switch K10 and the twelfth switch K12 are closed, each capacitor and the power supply AVDD jointly output voltages 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 capacitor C1 is connected in the first output pin 1042 and the second output pin 1043, there is a constant difference between the first output pin 1042 and the second output pin 1043, which is the voltage output by the first capacitor C1.

[0115] The following takes the output voltage of the power supply AVDD as 3V, and takes N=2 and N=3 as examples for description.

[0116] Fig. 16 is a schematic diagram of an example of a level conversion unit provided in an embodiment of the present application. As shown in Fig. 16, when N=2, only the first sub-circuit and the second sub-circuit exist, as shown in (a) of Fig. 16, when the first driving signal is at the first level, the seventh switch K7 and the eighth switch K8 are closed, and the twelfth switch K12 is disconnected, at this time, the power supply AVDD charges the first capacitor C1, the charging voltage of the first capacitor C1 is 3V, the first output pin 1042 outputs 0V voltage, and the voltage output by the second output pin 1043 is the output voltage 3V of the power supply AVDD connected with the seventh switch K7, as shown in (b) of Fig. 16, when the first driving signal is at the second level, the seventh switch K7 and the eighth switch K8 are disconnected, and the twelfth switch K12 is closed, the power supply AVDD connected with the twelfth switch K12 and the first capacitor C1 together output the output voltage 6V of 2 times of the power supply AVDD to the second output pin 1043, the power supply AVDD connected with the twelfth switch K12 outputs the output voltage 3V of 1 times of the power supply AVDD to the first output pin 1042, and the voltage difference 3V between the first output pin 1042 and the second output pin 1043 supplies power to the touch chip 101, and since the first driving signal is a square wave signal, at this time, the first output pin 1042 outputs the third driving signal of 0V-3V.

[0117] Fig. 17 is a schematic diagram of another example of a level conversion unit provided in an embodiment of the present application. As shown in Fig. 17, when N=3, the first sub-circuit, the second sub-circuit and the third sub-circuit exist, as shown in (a) of Fig. 17, when the first driving signal is at the first level, the seventh switch K7, the eighth switch K8, the ninth switch K9 and the eleventh switch K11 are closed, and the tenth switch K10 and the twelfth switch K12 are disconnected, at this time, the power supply AVDD charges the first capacitor C1 and the second capacitor C2, the charging voltage of the first capacitor C1 and the second capacitor C2 is 3V, the first output pin 1042 outputs 0V voltage, and the voltage output by the second output pin 1043 is the output voltage 3V of the power supply AVDD connected with the seventh switch K7, as shown in (b) of Fig. 17, when the first driving signal is at the second level, the seventh switch K7, the eighth switch K8, the ninth switch K9 and the eleventh switch K11 are disconnected, and the tenth switch K10 and the twelfth switch K12 are closed, the power supply AVDD connected with the twelfth switch K12, the first capacitor C1 and the second capacitor C2 together output the output voltage 9V of 3 times of the power supply AVDD to the second output pin 1043, the power supply AVDD connected with the twelfth switch K12 and the second capacitor C2 together output the output voltage 6V of 2 times of the power supply AVDD to the first output pin 1042, the voltage difference 3V between the first output pin 1042 and the second output pin 1043 supplies power to the touch chip 101, and since the first driving signal is a square wave signal, at this time, the first output pin 1042 outputs the third driving signal of 0V-6V.

[0118] FIG. 18 is a timing diagram of an output voltage according to an embodiment of the present application. As shown in FIG. 18, when the first driving signal is low, the second output pin 1043 outputs an AVDD output voltage, and the first output pin 1042 outputs a 0V voltage. When the first driving signal is high, the second output pin 1043 outputs an N times AVDD output voltage, and the first output pin 1042 outputs an N-1 times AVDD output voltage. N is the number of sub-circuits.

[0119] In the embodiment of the present application, the first output pin 1042 of the level conversion unit outputs the third driving signal by controlling the on-off of the switches in the N sub-circuits, and the second output pin 1043 outputs a power AVDD voltage with a constant difference from the output voltage of the first output pin 1042, thereby realizing the generation of the third driving signal and realizing the constant voltage supply to the touch chip 101.

[0120] FIG. 19 is a circuit diagram of another level conversion unit according to an embodiment of the present application. As shown in FIG. 19, the level conversion unit 104 includes a thirteenth switch K13, a fourteenth switch K14, a fifteenth switch K15, a third capacitor C3, and a direct current voltage conversion unit DC / DC. The first end of the thirteenth switch K13 is connected with the power AVDD, the second end of the thirteenth switch K13 is connected with the second output pin 1043, the first end of the third capacitor C3 is connected with the second output pin 1043, the second end of the third capacitor C3 is connected with the first output pin 1042 and the first end of the fourteenth switch K14, the second end of the fourteenth switch K14 is grounded, the input end of the direct current voltage conversion unit DC / DC is connected with the power AVDD, the output end of the direct current voltage conversion unit DC / DC is connected with the first end of the fifteenth switch K15, the second end of the fifteenth switch K15 is connected with the second end of the third capacitor C3. The direct current voltage conversion unit DC / DC can perform voltage boosting or voltage reducing processing on the output voltage of the power AVDD. The level conversion unit 104 is configured to control the on-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-off states of the thirteenth switch K13 and the fourteenth switch K14 are the same, and the on-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 third driving signal is generated at the first output pin 1042. When the fifteenth switch K15 is closed, a high level of the third driving signal is generated at the first output pin 1042. The output voltage of the power AVDD is equal to the supply voltage of the touch chip 101.

[0121] In an example, as shown in (a) of FIG. 19, 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 open, at this time, the third capacitor C3 in the circuit is charged by the power supply AVDD, as shown in (b) of FIG. 19, when the first driving signal is at the second level, the thirteenth switch K13 and the fourteenth switch K14 are open, and the fifteenth switch K15 is closed, the third capacitor C3 and the DC voltage conversion unit DC / DC together 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 with the third capacitor C3, there is a constant voltage difference between the first output pin 1042 and the second output pin 1043, which is the voltage output by the third capacitor C3.

[0122] In the following example, the power supply AVDD outputs a voltage of 3V, and the DC voltage conversion unit DC / DC boosts the voltage output by the power supply AVDD by M times, as shown in (a) of FIG. 19, 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 open, at this time, the third capacitor C3 is charged by the power supply AVDD, the charging voltage of the third capacitor C3 is 3V, the first output pin 1042 outputs a voltage of 0V, and the second output pin 1043 outputs the output voltage 3V of the power supply AVDD connected with the thirteenth switch K13, as shown in (b) of FIG. 19, when the first driving signal is at the second level, the thirteenth switch K13 and the fourteenth switch K14 are open, and the fifteenth switch K15 is closed, the DC voltage conversion unit DC / DC connected with the fifteenth switch K15 and the third capacitor C3 together output a voltage of 3*(M+1)V which is M+1 times of the output voltage of the power supply AVDD to the second output pin 1043, the DC voltage conversion unit DC / DC connected with the fifteenth switch K15 outputs a voltage of 3*MV which is M times of 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 is used to supply power to the touch chip 101, and since the first driving signal is a square wave signal, at this time, the first output pin 1042 outputs a third driving signal of 0V-3*MV, it should be understood that, since the voltage boost or voltage reduction of the DC voltage conversion unit DC / DC to the output voltage of the power supply AVDD can not be an integer times of the voltage boost or voltage reduction, M is a natural number greater than or equal to 0.

[0123] 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 buck circuit, for example, a buck DC / DC circuit, and the specific circuit can be set as required. It should also be understood that the scheme in which the DC voltage conversion unit DC / DC steps down the output voltage of the power supply AVDD is similar in principle to the scheme in which the DC voltage conversion unit DC / DC steps up the output voltage of the power supply AVDD in the above-described embodiments, and will not be described again here.

[0124] In the embodiment of the present application, the first output pin 1042 of the level conversion unit 104 outputs the third driving signal by controlling the on-off of the thirteenth switch K13, the fourteenth switch K14, and the fifteenth switch K15, and the second output pin 1043 outputs the power supply AVDD voltage with a constant voltage difference from the output voltage of the first output pin 1042, thereby achieving the generation of the third driving signal and the constant voltage supply to the touch chip 101.

[0125] FIG. 20 is a schematic diagram of a touch screen according to an embodiment of the present application. As shown in FIG. 20, the touch device further includes a grounding loop 105, which is located in the touch screen. The inductive loop 102, the grounding loop 105, and the electrode 401 are located in the same layer in the touch screen, and the grounding loop 105 is located between the inductive loop 102 and the electrode 401. The grounding loop 105 is grounded.

[0126] The touch screen can further include a grounding loop 105, which can have a structure similar to that of the inductive loop 102. The grounding loop 105 is grounded, and the inductive loop 102, the grounding loop 105, and the electrode 401 are located in the same layer. In an example, the grounding loop 105, the inductive loop 102, and the electrode 401 can be formed on the organic encapsulation layer of the display screen. Specifically, a metal can be deposited on the organic encapsulation layer to obtain the grounding loop 105, the inductive loop 102, and the electrode 401.

[0127] In the embodiment of the present application, the touch device further includes a grounding loop 105, which is located between the inductive loop 102 and the electrode 401. As a result, a shielding effect can be achieved, which can prevent the first excitation signal received by the inductive loop 102 from being directly coupled to the electrode 401, thereby improving the dynamic range of the induced signal generated in the electrode 401 and increasing the strength of the induced signal.

[0128] FIG. 21 is a schematic diagram of another touch chip according to an embodiment of the present application. As shown in FIG. 21, the touch chip 101 includes a current conversion unit 1016 and a processing unit 1015. The current conversion unit 1016 can generate an identification signal according to the induced signal, and the processing unit 1015 can perform touch position identification according to the identification signal.

[0129] In the embodiment of the present application, the touch chip 101 comprises the current conversion unit 1016 and the processing unit 1015, so that the sensing signal can be received by the current conversion unit 1016 and converted into a recognition signal, and the processing unit 1015 can recognize the touch position according to the recognition signal, thereby realizing the recognition of the touch position.

[0130] Fig. 22 is a circuit diagram of a current conversion unit provided by an embodiment of the present application. As shown in Fig. 22, the current conversion unit comprises a trans-impedance amplifier D1, a first resistor R1, a second resistor R2, a first feedback resistor Rf1, a second feedback resistor Rf2, a fourth capacitor C4, a fifth capacitor C5 and an analog-to-digital converter 10161. The first end of the first resistor R1 is connected with an electrode, the second end of the first resistor R1 is connected with the positive input end of the trans-impedance amplifier D1, the first end of the second resistor R2 is connected with a reference voltage VCMI, the second end of the second resistor R2 is connected with the negative input end of the trans-impedance amplifier D1, the negative output end of the trans-impedance amplifier D1 is connected with the first input end of the analog-to-digital converter 10161, the positive output end of the trans-impedance amplifier D1 is connected with the second input end of the analog-to-digital converter 10161, the first end of the first feedback resistor Rf1 is connected with the positive input end of the trans-impedance amplifier D1, the second end of the first feedback resistor Rf1 is connected with the negative output end of the trans-impedance amplifier D1, the first end of the second feedback resistor Rf2 is connected with the negative input end of the trans-impedance amplifier D1, the second end of the second feedback resistor Rf2 is connected with the positive output end of the trans-impedance amplifier D1, the first end of the fourth capacitor C4 is connected with the first end of the first feedback resistor Rf1, the second end of the fourth capacitor C4 is connected with the second end of the first feedback resistor Rf1, the first end of the fifth capacitor C5 is connected with the first end of the second feedback resistor Rf2, the second end of the fifth capacitor C5 is connected with the second end of the second feedback resistor Rf2, the trans-impedance amplifier D1 can convert the sensing signal into a recognition voltage, and the analog-to-digital converter 10161 can receive the recognition voltage and convert the recognition voltage into a recognition signal.

[0131] In an example, the sensing signal is a current signal, and the recognition current can be converted into a square wave signal by the feedback resistor, the capacitor and the trans-impedance amplifier D1. Specifically, the recognition current acts on the feedback resistor, the trans-impedance amplifier D1 recognizes the voltage between the two ends of the feedback resistor, and compares the voltage with the reference voltage VCMI to generate a square wave signal, and the analog-to-digital converter 10161 can convert the square wave signal output by the trans-impedance amplifier D1 into a digital signal.

[0132] In the embodiment of the present application, the identification current can be trans-impedance amplified by the trans-impedance amplifier D1, the sensing signal is converted into an identification voltage, the identification voltage can be converted into a digital signal by the ADC 10161, thus the identification current can be converted into an identification signal, the processor can identify the touch instruction according to the identification signal, and the touch identification is realized.

[0133] FIG. 23 is a circuit diagram of another current conversion unit provided by the embodiment of the present application. As shown in FIG. 23, the current conversion unit 1016 further includes a low-pass filter 10162, a first input terminal of the low-pass filter 10162 is connected with the negative output terminal of the trans-impedance amplifier D1, a second input terminal of the low-pass filter 10162 is connected with the positive output terminal of the trans-impedance amplifier D1, a first output terminal of the low-pass filter 10162 is connected with a first input terminal of the ADC 10161, and a second output terminal of the low-pass filter 10162 is connected with a second input terminal of the ADC 10161. The low-pass filter 10162 can low-pass filter the identification voltage, so as to reduce the external signal interference in the identification voltage.

[0134] In the embodiment of the present application, the current conversion unit 1016 further includes the low-pass filter 10162, thus the identification voltage can be low-pass filtered, the external signal interference in the identification voltage is reduced, for example, the out-of-band signal interference or signal noise is filtered out, meanwhile, the Nyquist aliasing effect is prevented, the signal-to-noise ratio of the identification voltage input to the ADC 10161 is improved, the identification signal corresponding to the external signal interference in the identification signal converted by the ADC 10161 is reduced, the influence of the external signal interference on the touch identification is reduced, and the accuracy of the touch identification is improved.

[0135] Fig. 24 is a circuit diagram of another current conversion unit provided by the embodiment of the application. As shown in Fig. 24, the current conversion unit 1016 further includes a sample-and-hold module 10163, which includes a sixteenth switch K16, a seventeenth switch K17, an eighteenth switch K18, a nineteenth switch K19, a sixth capacitor C6 and a seventh capacitor C7. The first end of the sixteenth switch K16 is connected with the first output end of the low-pass filter 10162. The second end of the sixteenth switch K16 is connected with the first end of the sixth capacitor C6 and the first end of the seventeenth switch K17. The second end of the seventeenth switch K17 is connected with the first input end of the analog-to-digital converter 10161. The second end of the sixth capacitor C6 is grounded. The first end of the eighteenth switch K18 is connected with the second output end of the low-pass filter 10162. The second end of the eighteenth switch K18 is connected with the first end of the seventh capacitor C7 and the first end of the nineteenth switch K19. The second end of the nineteenth switch K19 is connected with the second input end of the analog-to-digital converter 10161. The second end of the seventh capacitor C7 is grounded. The sample-and-hold module 10163 can hold the identification voltage.

[0136] Since the induction signal is a changing signal, the identification voltage output by the transimpedance amplifier D1, i.e., 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 to be converted into identification signals, the sample-and-hold circuit is provided, which can temporarily store the subsequent identification voltage when the analog-to-digital converter 10161 performs digital-to-analog conversion, so as to avoid 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 seventeenth switch K17 and / or the nineteenth switch K19 are disconnected, the identification voltage is temporarily stored through the sixth capacitor C6 and the seventh capacitor C7, and when the analog-to-digital converter 10161 is idle, the sixteenth switch K16 and / or the eighteenth switch K18 are disconnected, and the seventeenth switch K17 and / or the nineteenth switch K19 are closed, so that the analog-to-digital converter 10161 receives the identification voltage temporarily stored in the capacitor, and the sample-and-hold effect is realized through the sixteenth switch K16, the seventeenth switch K17, the eighteenth switch K18, the nineteenth switch K19, the sixth capacitor C6 and the seventh capacitor C7.

[0137] In the embodiment of the present application, the current conversion unit 1016 further comprises a sample-and-hold module 10163, which can sample and hold the identification voltage output by the transimpedance amplifier D1 through the sixteenth switch K16, the seventeenth switch K17, the eighteenth switch K18, the nineteenth switch K19, the sixth capacitor C6 and the seventh capacitor C7, thereby avoiding changes in the identification voltage due to changes in the induced signal, missing part of the identification voltage by the analog-to-digital converter 10161, ensuring that all the identification voltage converted by the analog-to-digital converter 10161 is converted into an identification signal, and improving the accuracy of touch identification.

[0138] FIG. 25 is a circuit diagram of another current conversion unit according to an embodiment of the present application. As shown in FIG. 25, the current conversion unit 1016 further comprises a buffer amplifier 10164, a first input terminal of the buffer amplifier 10164 is connected with the second terminal of the seventeenth switch K17, a second input terminal of the buffer amplifier 10164 is connected with the second terminal of the nineteenth switch K19, a first output terminal of the buffer amplifier 10164 is connected with the first input terminal of the analog-to-digital converter 10161, and a second output terminal of the buffer amplifier 10164 is connected with the second input terminal of the analog-to-digital converter 10161. The buffer amplifier 10164 can perform signal amplification processing on the identification voltage.

[0139] In the embodiment of the present application, the current conversion unit 1016 further comprises a buffer amplifier 10164, which can amplify the identification voltage. The buffer amplifier 10164 can be a level shifter or a buffer, etc. Specifically, the high level in the identification voltage can be raised, and the low level can be lowered to amplify the signal amplitude. Thus, the identification voltage signal amplitude input to the analog-to-digital converter 10161 can be large, avoiding the situation that the analog-to-digital converter 10161 cannot convert the identification voltage into an identification signal due to the small identification voltage, and improving the accuracy of touch identification.

[0140] The embodiment of the present application further provides a touch chip. The touch chip is configured to output a first driving signal, and in response to a first excitation signal according to a sensing loop. The first excitation signal is obtained according to the first driving signal. The sensing loop is located in a touch screen. When a finger touches the touch screen, the sensing loop, the finger and an electrode on the touch screen form a closed loop. An induced signal generated in the closed loop is used for touch position identification. In the embodiment of the present application, the touch chip 101 can be the touch chip 101 in any of the above embodiments, and can perform the operations in any of the above embodiments, which will not be repeated here.

[0141] Fig. 26 is a schematic diagram of a display screen module according to an embodiment of the present application. As shown in Fig. 26, the display screen module 400 includes the electrode 401 and the touch device 100 according to any of the above embodiments. The electrode 401 is used to form a closed loop with the sensing loop 102 and the finger when the finger touches the touch screen. The electrode 401 includes the horizontal electrode and / or the vertical electrode arranged on the touch screen.

[0142] Fig. 27 is a schematic diagram of an electronic device according to an embodiment of the present application. As shown in Fig. 27, the electronic device 200 includes the processor 201 and the display screen module 400 according to any of the above embodiments. The processor 201 is electrically connected to the display screen module 400. The processor 201 is configured to send a switching signal to the touch device 100, so that the touch chip 101 in the touch device 100 outputs the first driving signal to the sensing loop 102 or outputs the second driving signal to the electrode 401.

[0143] In the 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 the first driving signal to the sensing loop 102 or outputs the second driving signal to the electrode 401. In this way, the daily use scenario and the underwater use scenario can be switched. Since the conventional touch mode and the underwater touch mode are switched according to the switching signal, the touch position recognition can be applied to the daily scenario and the underwater scenario, and the touch position recognition can be applied to various use scenarios, which has high applicability.

[0144] Fig. 28 is an effect diagram of touch position recognition according to an embodiment of the present application. Fig. 28 is applicable to the effect produced in any of the embodiments of the present application. As shown in Fig. 28, (a) of Fig. 28 represents the signal amount of the touch signal. The curve 2801 in (a) of Fig. 28 represents the reference signal. The curve 2802 represents the sensing signal produced by the touch recognition of the touch device under water. The curve 2803 represents the standard signal of the manufacturer, i.e., the signal of the touch position detection through the electrode in the daily scenario. As shown in (a) of Fig. 28, the curve 2802 is close to the curve 2803, so that the touch recognition result under water is good. (b) of Fig. 28 represents the detection of the finger coordinates when the finger slides on the screen in the underwater mode. As shown in (b) of Fig. 28, the finger coordinates in different detection frames can be detected. The effect of the touch position detection under water is good.

[0145] It should be understood that the various embodiments described herein are described in connection with what is presently considered to be the best embodiments. As such, various modifications and changes can be made with respect to the various embodiments without departing from the scope and spirit of the disclosure. For example, different method steps can be performed in a different order, or can be performed concurrently, that is, at least in part, simultaneously. Further, although each of the embodiments describes various steps, alternatively, some steps can be stateless, that is, not performed at all. Also, various steps can be performed by different entities than those described. Furthermore, the various embodiments described herein are described in connection with a method for performing a process. However, the various embodiments described herein can also be implemented as a system, apparatus, or a computer program product. For example, the various embodiments described herein can be implemented as a system, apparatus, or a computer program product that includes a computer program tangibly embodied in a machine-readable storage medium (e.g., magnetic hard disk, floppy disk, magnetic tape, optical disk, flash memory, semiconductor memory, etc.) that includes one or more instructions that, when executed by a machine (e.g., a computer), cause the machine to perform the steps described herein. The computer program can be executed by a single processor or by multiple processors in a distributed computing environment.

[0146] It should be understood that the various embodiments described herein are described in connection with what is presently considered to be the best embodiments. As such, various modifications and changes can be made with respect to the various embodiments without departing from the scope and spirit of the disclosure. For example, different method steps can be performed in a different order, or can be performed concurrently, that is, at least in part, simultaneously. Further, although each of the embodiments describes various steps, alternatively, some steps can be stateless, that is, not performed at all. Also, various steps can be performed by different entities than those described. Furthermore, the various embodiments described herein are described in connection with a method for performing a process. However, the various embodiments described herein can also be implemented as a system, apparatus, or a computer program product. For example, the various embodiments described herein can be implemented as a system, apparatus, or a computer program product that includes a computer program tangibly embodied in a machine-readable storage medium (e.g., magnetic hard disk, floppy disk, magnetic tape, optical disk, flash memory, semiconductor memory, etc.) that includes one or more instructions that, when executed by a machine (e.g., a computer), cause the machine to perform the steps described herein. The computer program can be executed by a single processor or by multiple processors in a distributed computing environment.

[0147] It should be understood that the various embodiments described herein are described in connection with what is presently considered to be the best embodiments. As such, various modifications and changes can be made with respect to the various embodiments without departing from the scope and spirit of the disclosure. For example, different method steps can be performed in a different order, or can be performed concurrently, that is, at least in part, simultaneously. Further, although each of the embodiments describes various steps, alternatively, some steps can be stateless, that is, not performed at all. Also, various steps can be performed by different entities than those described. Furthermore, the various embodiments described herein are described in connection with a method for performing a process. However, the various embodiments described herein can also be implemented as a system, apparatus, or a computer program product. For example, the various embodiments described herein can be implemented as a system, apparatus, or a computer program product that includes a computer program tangibly embodied in a machine-readable storage medium (e.g., magnetic hard disk, floppy disk, magnetic tape, optical disk, flash memory, semiconductor memory, etc.) that includes one or more instructions that, when executed by a machine (e.g., a computer), cause the machine to perform the steps described herein. The computer program can be executed by a single processor or by multiple processors in a distributed computing environment.

[0148] It should be understood that the various embodiments described herein are described in connection with what is presently considered to be the best embodiments. As such, various modifications and changes can be made with respect to the various embodiments without departing from the scope and spirit of the disclosure. For

Claims

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

2. The touch device according to claim 1, characterized in that, The sensing circuit is used to detect cracks in the touch screen.

3. The touch device according to claim 1, characterized in that, The sensing circuit and the electrode are located on the same layer within the touch screen.

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

5. The touch device according to claim 4, characterized in that, When the electronic device is in underwater mode, the touch chip outputs the first driving signal; when the electronic device is in non-underwater mode, the touch chip sends a second driving signal to the electrode.

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

7. The touch device according to claim 4, characterized in that, At least one of the plurality of horizontal electrodes and the plurality of vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip sends the second driving signal to the driving electrode and performs position recognition based on the touch signal output by the receiving electrode.

8. The touch device according to claim 4, characterized in that, The sensing circuit is connected to the first pin of the touch chip, and the excitation signal is the first driving signal; The sensing circuit is used to receive the first driving signal. When the finger touches the screen, the sensing circuit forms a closed loop with the finger and the electrode, and transmits the first driving signal in the closed loop to generate the sensing signal.

9. The touch device according to claim 8, characterized in that, The touch chip includes: a first switch and a second switch; The first switch is electrically connected to the first pin, one end of the second switch is electrically connected to the first pin, and the other end of the second switch is grounded. When the first switch is closed and the second switch is open, the touch chip outputs the first drive signal to the sensing circuit; When the first switch is open and the second switch is closed, the touch chip stops outputting the first drive signal to the sensing circuit and sends the second drive signal to the electrode.

10. The touch device according to claim 8, characterized in that, The touch device also includes a signal amplification module; The input terminal of the signal amplification module is connected to the first pin of the touch chip, and the output terminal of the signal amplification module is connected to the sensing circuit. The signal amplification module is used to amplify the level of the first driving signal and send the amplified first driving signal to the sensing circuit so as to transmit the amplified first driving signal in the closed circuit.

11. The touch device according to claim 4, characterized in that, The touch device further includes: a level conversion unit; The input pin of the level conversion unit is electrically connected to the second pin of the touch chip, the first output pin of the level conversion unit is electrically connected to the ground pin of the touch chip, and the second output pin of the level conversion unit is connected to the power supply pin of the touch chip. The level conversion unit is used to receive the first driving signal output by the touch chip through the second pin, generate a third driving signal according to the first driving signal, output the third driving signal to the ground pin through the first output pin, and transmit power supply voltage to the touch chip through the power supply pin, wherein the voltage difference between the power supply voltage and the third driving signal is equal to the power supply voltage of the touch chip.

12. The touch device according to claim 11, characterized in that, The sensing circuit is connected to the third pin of the touch chip; the touch chip is used to generate the first excitation signal based on the third driving signal, and transmit the first excitation signal to the sensing circuit through the third pin.

13. The apparatus according to claim 11, characterized in that, The touch chip includes a third switch and a fourth switch; The third switch is electrically connected to the second pin of the touch chip, one end of the fourth switch is electrically connected to the second pin, and the other end of the fourth switch is grounded; When the third switch is closed and the fourth switch is open, the touch chip outputs the first driving signal to the level conversion unit; When the third switch is open and the fourth switch is closed, the touch chip stops outputting the first drive signal to the level conversion unit.

14. The touch device according to claim 12, characterized in that, The touch chip includes: a fifth switch and a sixth switch; The fifth switch is electrically connected to the third pin of the touch chip, one end of the sixth switch is electrically connected to the third pin, and the other end of the sixth switch is grounded; When the fifth switch is closed and the sixth switch is open, the touch chip outputs the first excitation signal to the sensing circuit; When the fifth switch is open and the sixth switch is closed, the touch chip stops outputting the first excitation signal to the sensing circuit.

15. The touch device according to claim 11, characterized in that, The sensing circuit is electrically connected to the first output pin, and the excitation signal is the third driving signal; The sensing circuit is used to receive the third driving signal. When the finger touches the screen, the sensing circuit forms a closed loop with the finger and the electrode, and transmits the third driving signal in the closed loop to generate the sensing signal.

16. The touch device according to any one of claims 11-15, characterized in that, The fourth pin of the touch chip is connected to the electrode; The touch chip is used to output a second excitation signal to the electrode according to the third driving signal; The electrode is used to receive the second excitation signal. When the finger touches the screen, the sensing circuit forms a closed loop with the finger and the electrode, and transmits the second excitation signal and the first excitation signal in the closed loop to generate the sensing signal.

17. The touch device according to any one of claims 1-15, characterized in that, The sensing circuit includes a first sensing circuit and a second sensing circuit; The first end of the first sensing circuit and the first end of the second sensing circuit receive the first excitation signal, and the second end of the first sensing circuit is connected to the second end of the second sensing circuit.

18. The touch device according to claim 11, characterized in that, The level conversion unit includes N sub-circuits, where N is an integer greater than or equal to 2; The first sub-circuit of the N sub-circuits includes a seventh switch, an eighth switch, and a first capacitor. The first terminal of the seventh switch is connected to the power supply, the second terminal of the seventh switch is connected to the second output pin, the first terminal of the first capacitor is connected to the second output pin, the second terminal of the first capacitor is connected to the first terminal of the eighth switch and the first output pin, and the second terminal of the eighth switch is grounded. The i-th sub-circuit of the N sub-circuits includes a ninth switch, a tenth switch, an eleventh switch, and a second capacitor. The first terminal of the ninth switch is connected to the power supply, the second terminal of the ninth switch is connected to the first terminal of the tenth switch, the second terminal of the tenth switch is connected to the second terminal of the capacitor in the (i-1)-th sub-circuit, the first terminal of the second capacitor is connected to the second terminal of the ninth switch, the second terminal of the second capacitor is connected to the first terminal of the eleventh switch, and the second terminal of the eleventh switch is grounded. Here, i is an integer greater than 1 and less than N. The Nth sub-circuit of the N sub-circuits includes a twelfth switch, the first end of which is connected to the power supply, and the second end of which is connected to the second end of the capacitor in the (N-1)th sub-circuit. The level conversion unit is used to control the on / off state of the switches in the N sub-circuits according to the first driving signal, so that the on / off states of the seventh switch, the eighth switch, the ninth switch and the eleventh switch are the same, and the on / off states of the tenth switch and the twelfth switch are the same, while the on / off states of the seventh switch and the twelfth switch are opposite. When the seventh switch is closed, a low level of the third driving signal is generated on the first output pin, and when the twelfth switch is closed, a high level of the third driving signal is generated on the first output pin. The output voltage of the power supply is equal to the power supply voltage of the touch chip.

19. The touch device according to claim 11, characterized in that, The level conversion unit includes: a thirteenth switch, a fourteenth switch, a fifteenth switch, a third capacitor, and a DC voltage conversion unit; The first terminal of the thirteenth switch is connected to the power supply, the second terminal of the thirteenth switch is connected to the second output pin, the first terminal of the third capacitor is connected to the second output pin, the second terminal of the third capacitor is connected to the first terminal of the fourteenth switch and the first output pin respectively, and the second terminal of the fourteenth switch is grounded. The input terminal of the DC voltage conversion unit is connected to the power supply, the output terminal of the DC voltage conversion unit is connected to the first terminal of the fifteenth switch, and the second terminal of the fifteenth switch is connected to the second terminal of the third capacitor. The DC-DC voltage conversion unit is used to boost or buck the output voltage of the power supply. The level conversion unit is used to control the on / off state of the thirteenth switch, the fourteenth switch, and the fifteenth switch according to the first driving signal, so that the on / off state of the thirteenth switch and the fourteenth switch are the same, and the on / off state of the thirteenth switch and the fifteenth switch are opposite. When the thirteenth switch is closed, a low level of the third driving signal is generated on the first output pin, and when the fifteenth switch is closed, a high level of the third driving signal is generated on the first output pin. The output voltage of the power supply is equal to the power supply voltage of the touch chip.

20. The touch device according to any one of claims 1-15 or 18-19, characterized in that, The touch device also includes a grounding circuit; The grounding loop is located within the touchscreen, and the sensing loop, the grounding loop, and the electrode are located on the same layer within the touchscreen. The grounding loop is located between the sensing loop and the electrode, and the grounding loop is grounded.

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

22. The touch device according to claim 21, 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 fourth capacitor, a fifth capacitor, and an analog-to-digital converter; The first end of the first resistor is connected to the output terminal of the electrode, the second end of the first resistor is connected to the positive input terminal of the transimpedance amplifier, the first end of the second resistor is connected to the reference voltage, the second end of the second resistor is connected to the negative input terminal of the transimpedance amplifier, the negative output terminal of the transimpedance amplifier is connected to the first input terminal of the analog-to-digital converter, and the positive output terminal of the transimpedance amplifier is connected to the second input terminal of the analog-to-digital converter. The first end of the first feedback resistor is connected to the positive input terminal of the transimpedance amplifier, the second end of the first feedback resistor is connected to the negative output terminal of the transimpedance amplifier, and the first end of the second feedback resistor is connected to the negative input terminal of the transimpedance amplifier. The second end of the first feedback resistor is connected to the positive output terminal of the transimpedance amplifier; The first terminal of the fourth capacitor is connected to the first terminal of the first feedback resistor, the second terminal of the fourth capacitor is connected to the second terminal of the first feedback resistor, the first terminal of the fifth capacitor is connected to the first terminal of the second feedback resistor, and the second terminal of the fifth capacitor is connected to the second terminal of the second feedback resistor. The transimpedance amplifier is used to convert the induced signal into an identification voltage; the analog-to-digital converter is used to receive the identification voltage and convert the identification voltage into the identification signal.

23. The touch device according to claim 22, characterized in that, The current conversion unit further includes: a low-pass filter; The first input terminal of the low-pass filter is connected to the negative output terminal of the transimpedance amplifier, the second input terminal of the low-pass filter is connected to the positive output terminal of the transimpedance amplifier, the first output terminal of the low-pass filter is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the low-pass filter is connected to the second input terminal of the analog-to-digital converter. The low-pass filter is used to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

24. The touch device according to claim 23, characterized in that, The current conversion unit further includes a sample-and-hold module; the sample-and-hold module includes a sixteenth switch, a seventeenth switch, an eighteenth switch, a nineteenth switch, a sixth capacitor, and a seventh capacitor; the first terminal of the sixteenth switch is connected to the first output terminal of the low-pass filter, the second terminal of the sixteenth switch is connected to the first terminal of both the sixth capacitor and the first terminal of the seventeenth switch, the second terminal of the seventeenth switch is connected to the first input terminal of the analog-to-digital converter, and the second terminal of the sixth capacitor is grounded; the first terminal of the eighteenth switch is connected to the second output terminal of the low-pass filter, the second terminal of the eighteenth switch is connected to the first terminal of both the seventh capacitor and the first terminal of the nineteenth switch, the second terminal of the nineteenth switch is connected to the second input terminal of the analog-to-digital converter, and the second terminal of the seventh capacitor is grounded; the sample-and-hold module is used to hold the identification voltage.

25. The touch device according to claim 24, 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 seventeenth switch, the second input terminal of the buffer amplifier is connected to the second terminal of the nineteenth switch, the first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is used to amplify the identification voltage.

26. A touch chip, characterized in that, The touch chip is used to output a first driving signal and respond to the first excitation signal according to the sensing circuit. When the finger touches the screen, the sensing circuit, the finger and the electrodes on the touch screen form a closed circuit, and the sensing signal generated in the closed circuit is used to identify the touch position. The first excitation signal is obtained according to the first driving signal, and the sensing circuit is located in the touch screen.

27. A display screen module, characterized in that, Includes electrodes and a touch device as described in any one of claims 1-25; When a finger touches the screen, the electrode forms a closed loop with the sensing circuit and the finger. The electrode includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.

28. An electronic device, characterized in that, Includes a processor and the display screen module as described in claim 27; The processor is electrically connected to the display screen module; The processor is used to send a switching signal to the touch device so that the touch chip in the touch device outputs a first driving signal or outputs a second driving signal to the electrode.

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