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

Abstract

Embodiments of the present application provide a touch device, a touch chip, a display screen module, and an electronic device. The touch device comprises: a touch chip, wherein the touch chip is used for sending a driving signal to electrodes; the electrodes, wherein the electrodes include a plurality of transverse electrodes and a plurality of longitudinal electrodes; and switching transistors, wherein at least two electrodes are connected by means of a corresponding switching transistor, the switching transistor is closed, so that the at least two electrodes are connected to form at least one induction loop, the induction loop is used for mutual inductance with an external movable coil, the touch chip carries out touch position identification on the basis of a signal after mutual inductance, and the at least two electrodes include at least one of the transverse electrodes and the longitudinal electrodes. The touch device provided by the embodiment of the present application can underwater identify the touch position of the movable coil on a touch screen by means of the touch chip, and thus, the touch device can be suitable for carrying out touch identification in a plurality of usage scenarios, and has high applicability.

Description

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

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

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

[0003] Currently, the touch control device included in the display screen of the electronic device adopts a capacitive solution to identify touch control instructions.

[0004] However, since the capacitive solution is more sensitive to water when recognizing touch commands, when the display screen is covered with water, it cannot recognize the touch commands of the finger, resulting in the existing electronic devices being unable to be used underwater.

[0005] Summary of the Invention

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

[0007] According to a first aspect of an embodiment of the present application, a touch device is provided, comprising: a touch chip, the touch chip being configured to send a drive signal to an electrode; the electrodes, the electrodes comprising a plurality of transverse electrodes and a plurality of longitudinal electrodes; a switch tube, at least two electrodes being connected via the switch tube, the switch tube connecting the at least two electrodes to form at least one induction loop when closed, the induction loop being configured to generate mutual induction with an external dynamic coil, the touch chip performing touch position identification based on a signal generated by the mutual induction, wherein the at least two electrodes comprise at least one of the transverse electrodes and the longitudinal electrodes.

[0008] In one possible implementation, after the switch tube is disconnected, the electrodes are all in a disconnected state, the touch chip sends a driving signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and performs position identification based on the sensing signal output by the other of the multiple horizontal electrodes and the multiple vertical electrodes.

[0009] In a possible implementation, at least two of the electrodes are one of the horizontal electrodes and the vertical electrodes, and at least two of the electrodes include a first electrode and a second electrode that are adjacently arranged. When the switch tube is closed, the first electrode and the second electrode are connected to form the induction loop.

[0010] In a possible implementation, the at least two electrodes are connected through the switch tube, including: one end of the first electrode is connected to the touch chip, and the other end of the first electrode is connected to one end of the switch tube; one end of the second electrode is connected to the touch chip, and the other end of the second electrode is connected to the other end of the switch tube.

[0011] In a possible implementation, at least two of the electrodes are one of the transverse electrodes and the longitudinal electrodes, the at least two electrodes include at least three electrodes arranged adjacent to each other, and the switching tube includes at least two switching tubes, which, when closed, connect the at least three electrodes to form the induction loop.

[0012] In a possible implementation, when the sensing loop includes i electrodes, the first end of the Kth electrode among the i electrodes and the first end of the Lth electrode among the i electrodes are connected through a switch tube, and the second end of the K+1th electrode among the i electrodes and the second end of the Lth electrode among the i electrodes are connected through a switch tube, wherein K+L=i+1, when i is an odd number, the second end of the Kth electrode among the i electrodes is connected to the touch chip, and the The first end of the electrode is connected to the touch chip. When i is an even number, the second end of the Kth electrode among the i electrodes is connected to the touch chip. The second end of each electrode is connected to the touch chip, and i is a positive integer greater than or equal to 3.

[0013] In one possible implementation, the induction loop includes an induction loop formed by one of the transverse electrodes and the longitudinal electrodes; the touch chip is used to send a drive signal to the induction loop, the induction loop and the dynamic coil perform mutual induction, and the touch chip identifies the touch position based on changes in the signal in the induction loop after the mutual induction.

[0014] In one possible implementation, the at least one induction loop includes a first induction loop and a second induction loop; the first induction loop includes an induction loop formed by one of the horizontal electrode and the vertical electrode, and the second induction loop includes an induction loop formed by the other of the horizontal electrode and the vertical electrode; the touch chip is used to send a drive signal to the first induction loop, and the first induction loop and the dynamic coil are mutually inductively connected to generate an induced current in the dynamic coil; the second induction loop is used to mutually inductively connect with the first induction loop and / or the dynamic coil, and the touch chip identifies the touch position based on the signal generated by the mutual induction of the second induction loop.

[0015] In one possible implementation, the touch chip is configured to continuously send a drive signal to the first induction loop; the dynamic coil is configured to generate mutual induction with the first induction loop to change the current in the first induction loop; the second induction loop is configured to generate mutual induction with the first induction loop and the dynamic coil, and the touch chip identifies the touch position based on a signal generated by the mutual induction of the second induction loop.

[0016] In one possible implementation, the touch chip is configured to intermittently send a drive signal to the first induction circuit; the dynamic coil is configured to generate mutual induction with the first induction circuit when the touch chip sends the drive signal to the first induction circuit, thereby generating an induced current in the dynamic coil; and the second induction circuit is configured to generate mutual induction with the dynamic coil when the touch chip does not send a drive signal to the first induction circuit, and the touch chip performs touch position identification based on a signal generated by the mutual induction of the second induction circuit.

[0017] In one possible implementation, the touch chip includes a current conversion unit and a processing unit; the current conversion unit is used to generate a touch signal based on a signal after mutual induction between the induction loop and the dynamic coil; the processing unit is used to identify a touch position based on the touch signal.

[0018] In a possible implementation, the current conversion unit includes a transimpedance amplifier, a first resistor, a second resistor, a first feedback resistor, a second feedback resistor, a first capacitor, a second capacitor, and an analog-to-digital converter; the first end of the first resistor is connected to the output end of the induction loop, the second end of the first resistor is connected to the positive input end of the transimpedance amplifier, the first end of the second resistor is connected to the reference voltage, the second end of the second resistor is connected to the negative input end of the transimpedance amplifier, the negative output end of the transimpedance amplifier is connected to the first input end of the analog-to-digital converter, and the positive output end of the transimpedance amplifier is connected to the second input end of the analog-to-digital converter; the first end of the first feedback resistor is connected to the positive input end of the transimpedance amplifier, and the first feedback resistor is connected to the positive input end of the transimpedance amplifier. The second end of the resistor is connected to the negative output end of the transimpedance amplifier, the first end of the second feedback resistor is connected to the negative input end of the transimpedance amplifier, and the second end of the first feedback resistor is connected to the positive output end of the transimpedance amplifier; the first end of the first capacitor is connected to the first end of the first feedback resistor, the second end of the first capacitor is connected to the second end of the first feedback resistor, the first end of the second capacitor is connected to the first end of the second feedback resistor, and the second end of the second capacitor is connected to the second end of the second feedback resistor; the transimpedance amplifier is used to convert the signal after the mutual inductance between the induction loop and the moving coil into an identification voltage; the analog-to-digital converter is used to receive the identification voltage and convert the identification voltage into the touch signal.

[0019] In one possible implementation, the current conversion unit also includes: a low-pass filter; the first input end of the low-pass filter is connected to the negative output end of the transimpedance amplifier, the second input end of the low-pass filter is connected to the positive output end of the transimpedance amplifier, the first output end of the low-pass filter is connected to the first input end of the analog-to-digital converter, and the second output end of the low-pass filter is connected to the second input end of the analog-to-digital converter; the low-pass filter is used to low-pass filter the identification voltage to reduce external signal interference in the identification voltage.

[0020] In a possible implementation, the current conversion unit further includes: a sampling and holding module; the sampling and holding module includes a first switch, a second switch, a third switch, a fourth switch, a third capacitor and a fourth capacitor; the first end of the first switch is connected to the first output end of the low-pass filter, the second end of the first switch is simultaneously connected to the first end of the third capacitor and the first end of the second switch, the second end of the second switch is connected to the first input end of the analog-to-digital converter, and the second end of the third capacitor is grounded; the first end of the third switch is connected to the second output end of the low-pass filter, the second end of the third switch is simultaneously connected to the first end of the fourth capacitor and the first end of the fourth switch, the second end of the fourth switch is connected to the second input end of the analog-to-digital converter, and the second end of the fourth capacitor is grounded; the sampling and holding module is used to maintain the identification voltage.

[0021] In one possible implementation, the current conversion unit further includes: a buffer amplifier; a first input terminal of the buffer amplifier is connected to the second terminal of the second switch, a second input terminal of the buffer amplifier is connected to the second terminal of the fourth switch, a first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and a second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; the buffer amplifier is configured to amplify the identification voltage.

[0022] According to a second aspect of an embodiment of the present application, a touch chip is provided, wherein the touch chip is connected to electrodes and is used to send drive signals to the electrodes; the electrodes include multiple horizontal electrodes and multiple vertical electrodes; at least two electrodes are connected via a switch tube, and when the switch tube is closed, the at least two electrodes are connected to form at least one induction loop, and the induction loop is used to perform mutual induction with an external dynamic coil. The touch chip performs touch position identification based on the signal after the mutual induction, wherein the at least two electrodes include at least one of the horizontal electrodes and the vertical electrodes.

[0023] According to a third aspect of the embodiments of the present application, a display screen module is provided, characterized by comprising the touch device according to the first aspect of the embodiments of the present application.

[0024] According to the fourth aspect of the embodiment of the present application, an electronic device is provided, comprising a processor and the display screen module described in the second aspect of the embodiment of the present application; the processor is electrically connected to the display screen module; the processor is used to send a control signal to the touch device to close the switch tube in the touch device.

[0025] According to the touch device provided in the embodiment of the present application, the touch device includes a touch chip, electrodes and a switch tube. When the switch tube is closed, multiple electrodes are connected to form at least one induction loop, thereby enabling mutual induction between the induction loop and the external dynamic coil. The touch chip can identify the touch position based on the signal after mutual induction. The touch device in the embodiment of the present application uses mutual induction between coils for touch recognition. Since the underwater environment has little effect on the mutual inductance between coils, compared with the capacitive touch recognition solution in the prior art, the touch device can be suitable for touch recognition in underwater environments, and the touch screen can be touched through the dynamic coil underwater. Therefore, the touch device can be suitable for touch recognition in a variety of usage scenarios and has high applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] FIG1 is a schematic diagram of a touch device provided in an embodiment of the present application;

[0028] FIG2 is a schematic diagram of a display screen provided in an embodiment of the present application;

[0029] FIG3 is a schematic diagram of an induction loop provided in an embodiment of the present application;

[0030] FIG4 is a schematic diagram of another induction loop provided in an embodiment of the present application;

[0031] FIG5 is a schematic diagram of another induction loop provided in an embodiment of the present application;

[0032] FIG6 is a schematic diagram of current changes caused by mutual inductance between a moving coil and an induction loop provided in an embodiment of the present application;

[0033] FIG7 is a schematic diagram showing the effect of the relative position between a moving coil and an induction loop on current provided by an embodiment of the present application;

[0034] FIG8 is a schematic diagram of the mutual inductance between a moving coil and an induction loop provided in an embodiment of the present application;

[0035] FIG9 is a schematic diagram of another induction loop provided in an embodiment of the present application;

[0036] FIG10 is a schematic diagram of another induction loop provided in an embodiment of the present application;

[0037] FIG11 is a schematic diagram of another embodiment of the present application showing a current change caused by mutual inductance between a moving coil and an induction loop;

[0038] FIG12 is a schematic diagram of a current change caused by mutual inductance between a moving coil and an induction loop according to another embodiment of the present application;

[0039] FIG13 is a schematic diagram of another mutual inductance between a moving coil and an induction loop provided in an embodiment of the present application;

[0040] FIG14 is a schematic diagram of a touch control chip provided in an embodiment of the present application;

[0041] FIG15 is a circuit diagram of a current conversion unit provided in an embodiment of the present application;

[0042] FIG16 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0043] FIG17 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0044] FIG18 is a circuit diagram of another current conversion unit provided in an embodiment of the present application;

[0045] FIG19 is a schematic diagram of a display screen module provided in an embodiment of the present application;

[0046] FIG19 is a schematic diagram of a moving coil provided in an embodiment of the present application;

[0047] FIG20 is a schematic diagram of an electronic device provided in an embodiment of the present application;

[0048] FIG21 is a schematic diagram of a touch device provided in an embodiment of the present application;

[0049] FIG22 is a schematic diagram of a moving coil provided in an embodiment of the present application;

[0050] FIG23 is an equivalent circuit diagram of a mutual inductance provided in an embodiment of the present application;

[0051] FIG24 is a schematic diagram of the relationship between resonant frequency and gain provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and in detail described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0053] As mentioned above, with the development of science and technology, the integration of electronic devices is higher, and more and more electronic devices support IP6X waterproof level. There are many scenarios that require the use of electronic devices underwater, such as using mobile phones, touchpads and other electronic devices that need to touch the display screen underwater. At present, the touch device included in the display screen of the electronic device adopts capacitive recognition of touch commands. For example: the touch command is determined by the change in the capacitance of multiple horizontal electrodes and multiple vertical electrodes. However, since the capacitance is more sensitive to water when recognizing the touch command, when the display screen is covered by water, the touch command of the finger cannot be recognized, resulting in the existing electronic equipment being unable to be used underwater.

[0054] In an embodiment of the present application, the touch device includes a touch chip, electrodes and a switch tube. When the switch tube is closed, multiple electrodes are connected to form at least one induction loop, thereby enabling mutual induction between the induction loop and the external dynamic coil, and the touch chip can identify the touch position based on the signal after mutual induction. The touch device in the embodiment of the present application uses mutual induction between coils for touch recognition. Since the underwater environment has little effect on the mutual inductance between coils, compared with the capacitive touch recognition scheme in the prior art, the touch device can be suitable for touch recognition in underwater environments. The touch chip can identify the touch position of the dynamic coil on the touch screen underwater. Therefore, the touch device can be suitable for touch recognition in a variety of usage scenarios and has high applicability.

[0055] The touch device provided by the present application is described below through embodiments.

[0056] Figure 1 is a schematic diagram of a touch device provided in an embodiment of the present application. As shown in Figure 1, the touch device includes a touch chip 103, electrodes 101, and a switch tube 102. The touch chip 103 is used to send a drive signal to the electrode 101. The electrode 101 includes multiple horizontal electrodes and multiple vertical electrodes. At least two electrodes 101 are connected via the switch tube 102. When the switch tube 102 is closed, the at least two electrodes 101 are connected to form at least one induction loop. The induction loop is used to generate mutual induction with an external dynamic coil. The touch chip 103 identifies the touch position based on the signal after the mutual induction. The at least two electrodes 101 include at least one of a horizontal electrode and a vertical electrode. For example, the at least two electrodes include at least two horizontal electrodes and / or at least two vertical electrodes.

[0057] The touch device also includes a touch chip 103, which can output a driving signal to the electrode 101. In one example, the touch chip 103 can output a square wave driving signal or a sine wave driving signal to the electrode 101. The electrode 101 can perform touch recognition under the drive of the driving signal. The electrode 101 includes multiple horizontal electrodes and multiple vertical electrodes. Multiple horizontal electrodes or multiple vertical electrodes in the multiple electrodes 101 are connected to each other through a switch tube 102. For example, two adjacent horizontal electrodes are connected through one switch tube 102, and non-adjacent horizontal electrodes are connected through multiple switch tubes 102. It should be understood that the horizontal electrodes and the vertical electrodes are not connected through the switch tube 102, that is, the horizontal electrodes are connected to each other through the switch tube 102, and the vertical electrodes are connected to each other through the switch tube 102.

[0058] The switch tube 102 may be a plurality of switch tubes 102. When at least some of the plurality of switch tubes 102 are closed, at least some of the plurality of electrodes 101 form at least one induction loop. The induction loop can generate mutual induction with the external dynamic coil to generate a mutual induction signal. The touch control chip 103 can identify the touch position based on the mutual induction signal. The mutual induction signal can be a current signal, a voltage signal, etc.

[0059] In one example, the switch tube 102 can be a thin film field effect transistor (TFT). Specifically, Figure 2 is a schematic diagram of a display screen provided in an embodiment of the present application. As shown in Figure 2, the switch tube 102 can be a TFT layer in the display screen. The TFT layer includes multiple TFTs, that is, multiple switch tubes 102. At least some of the multiple TFTs are used to drive the display screen to display. There are redundant TFTs in the TFT layer. Multiple electrodes 101 can be set on the TFT layer, thereby realizing the connection of horizontal electrodes or vertical electrodes in pairs through multiple switch tubes 102 in the TFT layer. Optionally, multiple horizontally arranged metal strips and multiple vertically arranged metal strips can be deposited on the TFT layer as multiple horizontal electrodes and multiple vertical electrodes.

[0060] In another example, the switch tube 102 may be a plurality of switch tubes provided in the touch chip 103 , and both ends of the electrode 101 are connected to the touch chip 103 . When the switch tube 102 is closed, the plurality of electrodes 101 form an induction loop.

[0061] The two ends of the electrode may be connected to the touch chip directly or indirectly. For example, the electrodes may be indirectly connected via a switch or other device.

[0062] Optionally, the touch chip 103 can send a control signal to the switch tube 102 according to the switching signal sent by the processor of the external device. After the switch tube 102 receives the control signal, at least part of the switch tube 102 is closed, so that multiple horizontal electrodes and / or multiple vertical electrodes form an induction loop. For example, the switch tube 102 between adjacent horizontal electrodes is closed, so that the adjacent horizontal electrodes form an induction loop similar to a coil.

[0063] In the embodiment of the present application, the touch device includes a touch chip 103, an electrode 101 and a switch tube 102. When the switch tube 102 is closed, the multiple electrodes 101 are connected to form at least one induction loop, thereby enabling the touch chip 103 to identify the touch position based on the signal after mutual induction through the mutual induction between the induction loop and the external dynamic coil. The touch device in the embodiment of the present application uses the mutual induction between the coils for touch recognition. Since the underwater environment has little effect on the mutual inductance between the coils, compared with the capacitive touch recognition solution in the prior art, the touch device can be suitable for touch recognition in underwater environments. The touch position of the underwater dynamic coil on the touch screen can be identified by the touch chip. Therefore, the touch device can be suitable for touch recognition in a variety of usage scenarios and has high applicability.

[0064] In one possible implementation, after the switch tube 102 is disconnected, the electrodes 101 are all in a disconnected state, the touch chip 103 sends a driving signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and performs position recognition based on the sensing signal output by the other one of the multiple horizontal electrodes and the multiple vertical electrodes.

[0065] When the switch tube 102 is disconnected, the electrodes 101 are not connected, and one of the multiple horizontal electrodes or the multiple vertical electrodes serves as a driving electrode. The touch chip 103 outputs a driving signal to the driving electrode, and the other of the multiple horizontal electrodes or the multiple vertical electrodes serves as a receiving electrode to output a sensing signal. The touch chip 103 performs touch recognition based on the sensing signal and can identify the touch position of the finger. This method is a mutual capacitance detection method. In addition, in another embodiment, the self-capacitance detection method can be superimposed to identify the touch position of the finger. At least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip 103 sends a driving signal to the driving electrode and performs position recognition based on the sensing signal output by the receiving electrode. For example, the touch chip 103 outputs driving signals to multiple horizontal electrodes (driving electrodes) and simultaneously receives sensing signals output by the multiple horizontal electrodes (receiving electrodes), or the touch chip 103 outputs driving signals to multiple vertical electrodes (driving electrodes) and simultaneously receives sensing signals output by the multiple vertical electrodes (receiving electrodes), or the touch chip 103 simultaneously outputs driving signals to multiple horizontal electrodes and multiple vertical electrodes and simultaneously receives sensing signals output by multiple horizontal electrodes and multiple vertical electrodes, and the touch chip 103 performs touch recognition based on the received sensing signals.

[0066] Optionally, the touch chip 103 can send a control signal to the switch tube 102 according to the switching signal sent by the processor of the external device. After receiving the control signal, the switch tube 102 is disconnected or remains disconnected, so that the multiple electrodes 101 are not connected.

[0067] In an embodiment of the present application, when the switch tube 102 is disconnected, the electrodes 101 are all in a disconnected state, and the touch chip identifies the touch position based on the sensing signals output by the multiple electrodes 101. This can be used for touch position identification in daily use scenarios. Since the switch tube 102 can be switched between closed and disconnected states, it can be used for touch position identification in daily scenes and underwater scenes. Therefore, the touch device can be used for touch position identification in a variety of usage scenarios and has high applicability.

[0068] In a possible implementation, at least two electrodes 101 are one of horizontal electrodes and vertical electrodes, and the at least two electrodes 101 include a first electrode and a second electrode disposed adjacent to each other. When the switch tube 102 is closed, the first electrode and the second electrode are connected to form an induction loop.

[0069] At least two electrodes 101 are horizontal electrodes or vertical electrodes, and the horizontal electrodes or vertical electrodes include adjacently arranged first electrodes 101 and second electrodes 101. For example, if there are 16 horizontal electrodes 101, there are 8 first electrodes and 8 second electrodes in the horizontal electrodes, and the first electrodes and the second electrodes are arranged crosswise.

[0070] When the switch tube 102 is closed, a first electrode and a second electrode form an induction loop. It should be noted that only part of the switch tube 102 can be closed so that part of the first electrode and part of the second electrode form at least one induction loop. The specific setting can be made as needed.

[0071] In the embodiment of the present application, when the switch tube 102 is closed, adjacent horizontal electrodes or adjacent vertical electrodes are connected to form multiple induction loops. Since the induction loop can be equivalent to a single-turn coil, it can generate mutual induction with the dynamic coil. The touch position can be identified through the signal after mutual induction. Moreover, since the induction loop only includes two electrodes 101, the number of induction loops is large, which can improve the accuracy of touch position identification.

[0072] FIG3 is a schematic diagram of an induction loop provided in an embodiment of the present application. As shown in FIG3 , when at least two electrodes 101 are connected via a switch tube 102 to form at least one induction loop 104, one end of a first electrode 1011 is connected to a touch chip 103, and the other end of the first electrode 1011 is connected to one end of the switch tube 102. One end of a second electrode 1012 is connected to the touch chip 103, and the other end of the second electrode 1012 is connected to the other end of the switch tube 102.

[0073] One of the first electrode 1011 and the second electrode 1012 can receive a driving signal sent by the touch chip 103 , and the other of the first electrode 1011 and the second electrode 1012 can be grounded through the touch chip 103 , thereby forming a closed loop.

[0074] It should be understood that FIG3 is only an example. Specifically, the induction loop 104 may also be composed of longitudinal electrodes, which will not be described in detail here.

[0075] In the embodiment of the present application, when the switch tube 102 is closed, adjacent horizontal electrodes or adjacent vertical electrodes are connected to form multiple induction loops 104. Since the induction loop 104 can be equivalent to a single-turn coil, it can generate mutual induction with the dynamic coil. The touch position can be identified through the signal after mutual induction. Moreover, since the induction loop 104 only includes two electrodes 101, the number of induction loops is large, which can improve the accuracy of touch position identification.

[0076] In one possible implementation, the at least two electrodes 101 are one of a horizontal electrode and a vertical electrode, the at least two electrodes 101 include at least three electrodes 101 arranged adjacent to each other, the switch tube 102 includes at least two switch tubes 102, and when the at least two switch tubes 102 are closed, the at least three electrodes 101 are connected to form an induction loop.

[0077] When the multiple switch tubes 102 are closed, at least three adjacent electrodes 101 form a winding induction loop. The at least three adjacent electrodes 101 can be horizontal electrodes or vertical electrodes. For example, if there are 16 horizontal electrodes in total and four adjacent horizontal electrodes form an induction loop, then a total of four winding induction loops are formed.

[0078] It should be understood that one of the at least three electrodes 101 receives a drive signal from the touch chip 103, and another of the at least three electrodes 101 is grounded via the touch chip 103, thereby forming a circuitous closed loop. The circuitous shape can be a paperclip shape or other circuitous shapes, which are not limited here.

[0079] In the embodiment of the present application, when the switch tube 102 is closed, it connects at least three adjacent horizontal electrodes or at least three adjacent vertical electrodes to form multiple circuitous induction loops. Since the induction loop can be equivalent to a multi-turn coil, it can generate mutual induction with the dynamic coil. The touch position can be identified through the signal after mutual induction. Moreover, since the induction loop includes multiple electrodes 101 and is in the shape of a circuitous multi-turn coil, the generated magnetic field intensity is higher than that of the above embodiment including only two driving electrodes 101. The mutual induction with the dynamic coil has a greater impact on the signal, thereby increasing the sensitivity of touch recognition.

[0080] In a possible implementation, when the sensing loop includes i electrodes 101, the first end of the Kth electrode 101 among the i electrodes 101 and the first end of the Lth electrode 101 among the i electrodes 101 are connected through the switch tube 102, and the second end of the K+1th electrode 101 among the i electrodes 101 and the second end of the Lth electrode 101 among the i electrodes 101 are connected through the switch tube 102, wherein K+L=i+1, when i is an odd number, the second end of the Kth electrode 101 among the i electrodes 101 is connected to the touch chip 103, and the Kth electrode 101 among the i electrodes 101 is connected to the touch chip 103. The first end of each electrode 101 is connected to the touch chip 103. When i is an even number, the second end of the Kth electrode 101 among the i electrodes 101 is connected to the touch chip 103. The second end of each electrode 101 is connected to the touch chip 103 , and i is a positive integer greater than or equal to 3.

[0081] The following examples illustrate the formation of an induction loop 104 using three electrodes 101 and a formation of an induction loop 104 using four electrodes 101. FIG4 is a schematic diagram of another induction loop provided by an embodiment of the present application. As shown in FIG4 , the induction loop 104 includes three electrodes 101. The first end of the first electrode 101 and the first end of the third electrode 101 are connected via a closed switch tube 102. The second end of the second driving electrode 101 and the second end of the third driving electrode 101 are connected via a closed switch tube 102. Because i=3, the second end of the first electrode 101 is connected to the touch chip 103, and the first end of the second electrode 101 is connected to the touch chip 103. That is, when i=3, K+L=4. It should be understood that the electrode 101 cannot be connected to itself, so K is not equal to L. The first electrode 101 or the second electrode 101 can receive the driving signal sent by the touch chip 103, and the other of the first electrode 101 or the second electrode 101 can be grounded through the touch chip 103, thereby forming a circuitous closed induction loop 104.

[0082] FIG5 is a schematic diagram of another induction loop provided in an embodiment of the present application. As shown in FIG5 , the induction loop 104 includes four electrodes 101. The first end of the first electrode 101 and the first end of the fourth electrode 101 are connected via a closed switch tube 102. The second end of the fourth electrode 101 and the second end of the second electrode 101 are connected via a closed switch tube 102. The first end of the second electrode 101 and the first end of the third electrode 101 are connected via a closed switch tube 102. The second end of the first electrode 101 and the first end of the third electrode 101 are connected via a closed switch tube 102. The second end of the first electrode 101 is connected to the touch chip 103. The second end of the third driving electrode 101 is connected to the touch chip 103. That is, when i=4, K+L=5. It should be understood that the electrode 101 cannot be connected to itself, so K is not equal to L. The first electrode 101 or the third electrode 101 can receive the driving signal sent by the touch chip 103, and the other of the first electrode 101 and the third electrode 101 can be grounded through the touch chip 103, thereby forming a circuitous closed induction loop 104.

[0083] It should be understood that FIG4 and FIG5 are only examples. Specifically, the induction loop 104 may be composed of at least three electrodes 101, for example, five electrodes 101 or six electrodes 101, and the induction loop 104 may also be composed of longitudinal electrodes, which will not be described in detail here.

[0084] In the embodiment of the present application, when the switch tube 102 is closed, it connects at least three adjacent horizontal electrodes or at least three adjacent vertical electrodes to form multiple winding induction loops 104. Since the induction loop 104 can be equivalent to a multi-turn coil, it can generate mutual induction with the dynamic coil. The touch position can be identified through the signal after mutual induction. Moreover, since the induction loop 104 includes multiple electrodes 101 and is in the shape of a winding multi-turn coil, the generated magnetic field intensity is higher than that of the above embodiment including only two driving electrodes 101. The mutual induction with the dynamic coil has a greater impact on the current, thereby increasing the sensitivity of touch recognition.

[0085] In one possible implementation, the induction loop includes an induction loop formed by one of the horizontal electrodes and the vertical electrodes. The touch chip 103 is used to send a driving signal to the induction loop. The induction loop and the dynamic coil perform mutual induction. The touch chip 103 identifies the touch position based on the change of the signal in the induction loop after the mutual induction.

[0086] As shown in the examples of Figures 4 and 5, the induction loop is formed by one of the horizontal electrodes or the vertical electrodes. The induction loop can receive a driving signal sent by the touch chip 103. In one example, the driving signal is a driving voltage. The induction loop generates a driving current under the drive of the driving voltage. When the moving coil approaches the induction loop, since the induction loop includes the driving current and the induction loop is a closed loop, a magnetic field exists in the induction loop, and mutual induction occurs between the induction loop and the moving coil. The touch chip 103 recognizes the touch position based on the change in the signal in the induction loop after the mutual induction.

[0087] In one example, when the induction loop and the moving coil are mutually inductive, a mutual induction current is generated in the moving coil, causing the load of the induction loop to change. Since the driving signal does not change, the driving current generated in the induction loop changes, and the touch chip 103 identifies the touch position based on the change in the driving current in the induction loop.

[0088] FIG6 is a schematic diagram of a current change caused by mutual induction between a moving coil and an induction loop according to an embodiment of the present application. As shown in FIG6 , when the moving coil is not close to the induction loop, the induction loop generates a driving current driven by a driving signal. When the moving coil and the induction loop are mutually inducted, an induced current is generated in the moving coil, and the driving current generated in the induction loop increases. The touch chip 103 identifies the touch position based on the change in the driving current in the induction loop.

[0089] FIG7 is a schematic diagram illustrating the effect of the relative position of a moving coil and an induction loop on current, according to an embodiment of the present application. In FIG7a , the ordinate represents the current magnitude, and the abscissa represents the distance between the moving coil and the induction loop in the X or Y direction. As shown in FIG7a , the closer the moving coil is to point n in FIG7a in the X or Y direction, the smaller the load on the induction loop, and thus the larger the drive current in the induction loop. Point n is located at the center of the induction loop. In FIG7b , the ordinate represents the current magnitude, and the abscissa represents the distance between the moving coil and the induction loop in the Z direction. As shown in FIG7b , the closer the moving coil is to the induction loop in the Z direction, the smaller the load on the induction loop, and the larger the drive current in the induction loop. For example, when the moving coil slides on a touch device, the mutual inductance and drive current are maximum when the moving coil and the induction loop overlap. As the moving coil slides toward the sides from the center, the mutual inductance gradually decreases. The touch chip 103 recognizes the touch position based on the change in the drive current in the induction loop.

[0090] FIG8 is a schematic diagram of another mutual inductance between a moving coil and an induction loop provided in an embodiment of the present application. As shown in FIG8 , for the example shown in FIG6 , the induction loop 104 receives a drive signal and generates a drive current. The mutual inductance between the moving coil 200 and the induction loop 104 generates a mutual inductance current, which changes the load of the induction loop 104 and, therefore, changes the current in the induction loop 104.

[0091] It should be understood that in the embodiments of the present application, since the sensing circuit only includes horizontal electrodes or vertical electrodes, the touch chip can only identify the horizontal or vertical coordinate of the touch location when identifying the touch location, and cannot accurately identify the touch location. Therefore, this is only suitable for scenarios with low touch accuracy requirements. In another example, one of the horizontal electrodes or the vertical electrodes can be used to form a sensing circuit. After touch detection, the sensing circuit can be disconnected, and then the other horizontal electrode or the vertical electrode can be used to form a sensing circuit, thereby identifying the horizontal and vertical coordinates of the touch location.

[0092] In the embodiment of the present application, the switch tube 102 between the multiple electrodes 101 in the horizontal electrodes or the vertical electrodes is closed to form an induction loop, and the induction loop and the dynamic coil are mutually inductive, thereby being able to identify the touch position. Since only the horizontal electrodes or the vertical electrodes are needed to form the induction loop, it is not necessary to use all the electrodes 101, so the power consumption of touch recognition is low. Moreover, since the touch position is recognized by mutual inductance between the coils, it can be applied to underwater touch scenarios with low touch accuracy requirements.

[0093] In one possible implementation, at least one induction loop includes a first induction loop and a second induction loop, the first induction loop includes an induction loop formed by one of the horizontal electrode and the vertical electrode, and the second induction loop includes an induction loop formed by the other of the horizontal electrode and the vertical electrode. The touch chip 103 is used to send a drive signal to the first induction loop, the first induction loop and the moving coil perform mutual induction to generate an induced current in the moving coil, and the second induction loop is used to perform mutual induction with the first induction loop and / or the moving coil. The touch chip 103 performs touch position identification based on the signal after the mutual induction of the second induction loop.

[0094] When the switch tube 102 is closed, the first induction loop is composed of one of the transverse electrodes or the longitudinal electrodes, and the second induction loop is composed of the other of the transverse electrodes or the longitudinal electrodes. That is, when the first induction loop is composed of the transverse electrodes, when the switch tube 102 is closed, the multiple transverse electrodes form at least one first induction loop, and the multiple longitudinal electrodes form at least one second induction loop. When the multiple longitudinal electrodes form at least one first induction loop, the multiple transverse electrodes form at least one second induction loop.

[0095] The first induction loop can receive a driving signal sent by the touch chip 103 and generate a driving current based on the driving signal. Since the induction loop includes the driving current and is a closed loop, a magnetic field exists in the induction loop, and mutual induction occurs between the induction loop and the moving coil, generating an induced current in the moving coil.

[0096] Since an induced current is generated in the moving coil and the moving coil is a closed coil, the moving coil generates a magnetic field. At this time, a magnetic field exists in the first induction loop and the moving coil. Therefore, the second induction loop is mutually inductive with the first induction loop and / or the moving coil. The touch chip 103 can identify the touch position based on the signal after the mutual induction of the second induction loop.

[0097] In one example, the horizontal electrodes can be formed into a first sensing circuit, and the vertical electrodes can be formed into a second sensing circuit. The touch chip 103 can detect the signal change after mutual induction of the second sensing circuit to identify the vertical coordinate of the touch position. Then, the vertical electrodes can be formed into a first sensing circuit, and the horizontal electrodes can be formed into a second sensing circuit. The touch chip 103 can detect the signal change after mutual induction of the second sensing circuit to identify the horizontal coordinate of the touch position. Specifically, the touch chip 103 outputs a driving signal to the sensing circuit composed of the horizontal electrodes, and detects the signal change after mutual induction of the sensing circuit composed of the vertical electrodes. Then, the touch chip 103 outputs a driving signal to the sensing circuit composed of the vertical electrodes, and detects the signal change after mutual induction of the sensing circuit composed of the horizontal electrodes.

[0098] FIG9 is a schematic diagram of another inductive loop provided in an embodiment of the present application, and FIG10 is a schematic diagram of another inductive loop provided in an embodiment of the present application. As shown in FIG9 and FIG10 , multiple horizontal electrodes form a first inductive loop 1041, and multiple vertical electrodes form a second inductive loop 1042. It should be understood that FIG9 and FIG10 are merely examples. Specifically, the first inductive loop 1041 can be formed by multiple vertical electrodes, and the second inductive loop 1042 can be formed by multiple horizontal electrodes. Detailed descriptions are omitted here.

[0099] In the embodiment of the present application, the induction loop includes a first induction loop 1041 and a second induction loop 1042. One of the multiple horizontal electrodes or vertical electrodes forms at least one first induction loop 1041, and the other of the multiple horizontal electrodes or vertical electrodes forms at least one second induction loop 1042. Therefore, mutual induction can be achieved through the first induction loop 1041 and the second induction loop 1042 and the moving coil, and the signal change after the mutual induction of the second induction loop 1042 is detected to achieve touch position identification. Since the horizontal electrodes and the vertical electrodes simultaneously have mutual induction with the moving coil, the signal change amplitude after the mutual induction of the second induction loop 1042 is large, and the accuracy of touch identification is high.

[0100] In one possible implementation, the touch chip 103 can continuously send a driving signal to the first induction circuit, the dynamic coil can mutually induct with the first induction circuit, causing the current in the first induction circuit to change, and the second induction circuit can mutually induct with the first induction circuit and the dynamic coil. The touch chip 103 identifies the touch position based on the signal after the mutual induction of the second induction circuit.

[0101] The touch control chip 103 continuously sends a drive signal to the first sensing loop. In one example, the drive signal is a drive voltage. After receiving the drive signal, the electrodes 101 in the first sensing loop generate a drive current based on the drive signal. It should be understood that the drive signal is a voltage signal, and the electrodes 101 can be equivalent to a load, generating a current under the drive of the voltage.

[0102] When the moving coil approaches, since the first induction loop includes a driving current, a closed magnetic flux line is formed, and the moving coil and the first induction loop are mutually inductive, a mutual inductive current is generated in the moving coil, causing the load in the first induction loop to change. Since the voltage of the driving signal is fixed, the driving current in the first induction loop will change.

[0103] Since the relative position of the second induction loop and the first induction loop does not change, when the first induction loop generates a driving current, the second induction loop and the first induction loop undergo mutual induction to generate an induction signal. When the driving current in the first induction loop changes, the second induction loop undergoes mutual induction with the first induction loop and the dynamic coil near the first induction loop, and the induction signal generated in the second induction loop changes. The touch chip 103 recognizes the touch position based on the signal after the mutual induction of the second induction loop.

[0104] In one example, the signal after mutual induction of the second induction loop can be a current signal. Figure 11 is a schematic diagram of another embodiment of the present application, provided by the mutual induction of the moving coil and the induction loop causing current changes. As shown in Figure 11, when the moving coil has no mutual induction with the first induction loop, the second induction loop has mutual induction with the first induction loop to generate an identification current. When the moving coil has mutual induction with the first induction loop, the driving current in the first induction loop increases. The second induction loop simultaneously has mutual induction with the moving coil and the first induction loop after the driving current increases, resulting in an increase in the identification current in the second induction loop.

[0105] In the embodiment of the present application, the touch chip 103 continuously sends a drive signal to the first induction loop. The mutual induction between the dynamic coil and the first induction loop causes the current generated in the first induction loop to change. The second induction loop has mutual induction with the first induction loop and the dynamic coil. Therefore, the touch position can be identified by the signal change after mutual induction in the second induction loop. Since touch recognition is performed using the mutual induction between the coils, the underwater environment has little impact on the mutual induction between the coils. Therefore, compared with the capacitive touch recognition solution in the prior art, the touch device can be suitable for touch recognition in underwater environments. Moreover, since the horizontal electrodes and the vertical electrodes simultaneously have mutual induction with the dynamic coil, the signal change amplitude after mutual induction in the second induction loop is larger, and the touch recognition accuracy is higher.

[0106] In one possible implementation, the touch chip 103 can intermittently send a driving signal to the first induction circuit. The dynamic coil can generate mutual induction with the first induction circuit when the touch chip 103 sends the driving signal to the first induction circuit, so that an induced current is generated in the dynamic coil. The second induction circuit can generate mutual induction with the dynamic coil when the touch chip 103 does not send a driving signal to the first induction circuit. The touch chip 103 identifies the touch position based on the signal after the mutual induction of the second induction circuit.

[0107] The touch chip 103 can intermittently send a driving signal to the first sensing circuit, and the first sensing circuit can receive the driving signal. Similar to the driving signal in the above embodiment, the driving signal can be a driving voltage. After receiving the driving signal, the electrode 101 in the first sensing circuit generates a driving current according to the driving signal.

[0108] When the moving coil approaches, a driving current flows through the first induction loop, forming closed magnetic flux lines. At this time, the first induction loop and the second induction loop are mutually inductive. When the moving coil and the first induction loop are mutually inductive, an induced current is generated in the moving coil. When the first induction loop stops receiving the driving signal, for example, the touch control chip 103 is controlled to stop outputting the driving signal to the first induction loop, the driving current in the first induction loop becomes zero. Since the induced current generated in the moving coil does not change suddenly, the induced current still exists in the moving coil for a short time. At this time, since the driving current of the first induction loop is zero, the second induction loop and the first induction loop stop mutually inductively. However, since the induced current still exists in the moving coil, the second induction loop and the moving coil are mutually inductively connected. The touch chip 103 recognizes the touch position based on the signal after the mutual induction of the second induction loop.

[0109] In one example, the induced signal in the second induction loop may be a current signal. FIG12 is a schematic diagram of another embodiment of the present application showing a current change caused by mutual induction between a moving coil and an induction loop. As shown in FIG12 , when a driving current is generated in the first induction loop, the moving coil and the first induction loop are mutually inductive to generate an induced current, and the second induction loop and the first induction loop are mutually inductive, so that an identification current is generated in the second induction loop. When the first induction loop is not driven by the driving signal, the first induction loop does not generate a driving current. At this time, the moving coil still contains an induced current, and the second induction loop and the moving coil are mutually inductive, causing the identification current generated in the second induction loop to change.

[0110] FIG13 is a schematic diagram of another mutual inductance between a moving coil and an induction loop provided in an embodiment of the present application. As shown in FIG13 , for the examples shown in FIG11 and FIG12 , the first induction loop 1041 receives a drive signal and generates a drive current. The moving coil 200 and the first induction loop 1041 generate an induced current through mutual induction. The second induction loop 1042 generates an identification current through mutual induction with at least one of the first induction loop 1041 and the moving coil 200. For example, the second induction loop 1042 generates mutual induction with both the first induction loop 1041 and the moving coil 200, or the second induction loop 1042 generates mutual induction with the first induction loop 1041, or the second induction loop 1042 generates mutual induction with the moving coil 200.

[0111] In the embodiment of the present application, the touch chip 103 intermittently sends a driving signal to the first induction loop 1041. The first induction loop 1041 and the moving coil generate mutual induction, causing the moving coil to generate an induced current. When the touch chip 103 is not sending a driving signal to the first induction loop 1041, the second induction loop 1042 generates mutual induction with the moving coil. Thus, the touch position can be identified by detecting the signal change in the second induction loop 1042 after the mutual induction. Because the touch chip 103 does not need to continuously output the driving signal and only needs to detect the signal change in the second induction loop 1042 when the first induction loop 1041 is not generating a driving current, compared with the previous embodiment in which the touch chip 103 continuously outputs the driving signal and continuously detects the second induction loop 1042, the power consumption of touch recognition is lower. Moreover, because touch recognition uses the mutual induction between the coils for touch recognition, the underwater environment has less impact on the mutual induction between the coils. Therefore, compared with the capacitive touch recognition solutions in the prior art, this touch device is suitable for touch recognition in underwater environments.

[0112] FIG14 is a schematic diagram of a touch chip provided in an embodiment of the present application. As shown in FIG14 , the touch chip 103 includes a current conversion unit 1031 and a processing unit 1032. The current conversion unit 1031 can generate a touch signal based on a signal after mutual induction between the induction loop and the moving coil, and the processing unit 1032 can identify the touch position based on the touch signal.

[0113] In the embodiment of the present application, the touch chip 103 includes a current conversion unit 1031 and a processing unit 1032, thereby receiving the mutual-inductance signal through the current conversion unit 1031, converting the mutual-inductance signal into a touch signal, and performing touch position recognition based on the touch signal through the processing unit 1032, thereby realizing the recognition of the touch position.

[0114] FIG15 is a circuit diagram of a current conversion unit provided in an embodiment of the present application. As shown in FIG15 , the current conversion unit 103 includes a transimpedance amplifier D1, a first resistor R1, a second resistor R2, a first feedback resistor Rf1, a second feedback resistor Rf2, a first capacitor C1, a second capacitor C2, and an analog-to-digital converter 10311. The first end of the first resistor R1 is connected to the output end of the induction loop, the second end of the first resistor R1 is connected to the positive input end of the transimpedance amplifier D1, the first end of the second resistor R2 is connected to the reference voltage VCMI, the second end of the second resistor R2 is connected to the negative input end of the transimpedance amplifier D1, the negative output end of the transimpedance amplifier D1 is connected to the first input end of the analog-to-digital converter 10311, the positive output end of the transimpedance amplifier D1 is connected to the second input end of the analog-to-digital converter 10311, and the first feedback resistor Rf1 is connected to the positive input end of the transimpedance amplifier D1. The first end is connected to the positive input end of the transimpedance amplifier D1, the second end of the first feedback resistor Rf1 is connected to the negative output end of the transimpedance amplifier D1, the first end of the second feedback resistor Rf2 is connected to the negative input end of the transimpedance amplifier D1, the second end of the second feedback resistor Rf2 is connected to the positive output end of the transimpedance amplifier D1, the first end of the first capacitor C1 is connected to the first end of the first feedback resistor Rf1, the second end of the first capacitor C1 is connected to the second end of the first feedback resistor Rf1, the first end of the second capacitor C2 is connected to the first end of the second feedback resistor Rf2, and the second end of the second capacitor C2 is connected to the second end of the second feedback resistor Rf2. The transimpedance amplifier D1 can convert the signal after the mutual inductance between the induction loop and the moving coil into an identification voltage, and the analog-to-digital converter 1031 can receive the identification voltage and convert the identification voltage into a touch signal.

[0115] In one example, the signal after the mutual induction of the induction loop and the moving coil is a current signal. The identification current can be converted into a square wave signal through the feedback resistor, the capacitor and the transimpedance amplifier D1. Specifically, the identification current acts on the feedback resistor, the transimpedance amplifier D1 identifies the voltage across the feedback resistor and compares it with the reference voltage VCMI to generate a square wave signal. The square wave signal output by the transimpedance amplifier D1 can be converted into a digital signal through the analog-to-digital converter 10311.

[0116] In an embodiment of the present application, the identification current can be transimpedance amplified by the transimpedance amplifier D1, and the signal after the mutual inductance between the induction loop and the moving coil can be converted into an identification voltage. The identification voltage can be converted into a digital signal by the analog-to-digital converter 10311, thereby converting the identification current into a touch signal, so that the processing unit can identify the touch instruction according to the touch signal, thereby realizing touch recognition.

[0117] Figure 16 is a circuit diagram of another current conversion unit provided in an embodiment of the present application. As shown in Figure 16, the current conversion unit 103 also includes: a low-pass filter 10312, the first input end of the low-pass filter 10312 is connected to the negative output end of the transimpedance amplifier D1, the second input end of the low-pass filter 10312 is connected to the positive output end of the transimpedance amplifier D1, the first output end of the low-pass filter 10312 is connected to the first input end of the analog-to-digital converter 10311, and the second output end of the low-pass filter 10312 is connected to the second input end of the analog-to-digital converter 10311. The low-pass filter 10312 can perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

[0118] In an embodiment of the present application, the current conversion unit 103 also includes a low-pass filter 10312, which can perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage, for example: filtering out out-of-band signal interference or signal noise, and at the same time preventing the Nyquist aliasing effect, thereby improving the signal-to-noise ratio of the identification voltage input to the analog-to-digital converter 10311, so that the touch signal converted by the analog-to-digital converter 10311 contains fewer touch signals corresponding to external signal interference, thereby reducing the impact of external signal interference on touch recognition and improving the accuracy of touch recognition.

[0119] FIG17 is a circuit diagram of another current conversion unit provided in an embodiment of the present application. As shown in FIG17 , the current conversion unit 103 further includes a sampling and holding module 10313. The sampling and holding module 10313 includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a third capacitor C3, and a fourth capacitor C4. A first end of the first switch K1 is connected to the first output end of the low-pass filter 10312, a second end of the first switch K1 is connected to both the first end of the third capacitor C3 and the first end of the second switch K2, a second end of the second switch K2 is connected to the first input end of the analog-to-digital converter 10311, a second end of the third capacitor C3 is grounded, a first end of the third switch K3 is connected to the second output end of the low-pass filter 10312, a second end of the third switch K3 is connected to both the first end of the fourth capacitor C4 and the first end of the fourth switch K4, a second end of the fourth switch K4 is connected to the second input end of the analog-to-digital converter 10311, and a second end of the fourth capacitor C4 is grounded. The sampling and holding module 10313 can hold an identification voltage.

[0120] Since the signal after the mutual induction between the induction loop and the moving coil is a varying signal, the identification voltage output by the transimpedance amplifier D1, i.e., the square wave signal, is a varying square wave signal. To ensure that all signals are input to the analog-to-digital converter 10311 and converted into touch signals, a sample-and-hold circuit is provided. This circuit can temporarily store subsequent identification voltages when the analog-to-digital converter 10311 performs digital-to-analog conversion, thereby preventing the analog-to-digital converter 10311 from missing some identification voltages due to variations in the identification voltages. Specifically, when the analog-to-digital converter 10311 performs digital-to-analog conversion, the second switch K2 and / or the fourth switch K4 can be disconnected, and the identification voltage can be temporarily stored via the third capacitor C3 and the fourth capacitor C4. When the analog-to-digital converter 10311 is idle, the first switch K1 and / or the third switch K3 can be disconnected, and the second switch K2 and / or the fourth switch K4 can be closed, so that the analog-to-digital converter 10311 receives the identification voltage temporarily stored in the capacitors. A sample-and-hold effect is achieved via the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the third capacitor C3, and the fourth capacitor C4.

[0121] In the embodiment of the present application, the current conversion unit 103 further includes a sampling and holding module 10313. The sampling and holding module 10313 can sample and hold the identification voltage output by the transimpedance amplifier D1 through the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the third capacitor C3, and the fourth capacitor C4. This can prevent the identification voltage from changing due to changes in the signal after the mutual inductance between the induction loop and the moving coil, causing the analog-to-digital converter 10311 to miss part of the identification voltage. This can ensure that the analog-to-digital converter 10311 converts all the identification voltages into touch signals, thereby improving the accuracy of touch recognition.

[0122] FIG18 is a circuit diagram of another current conversion unit provided in an embodiment of the present application. As shown in FIG18 , the current conversion unit 103 further includes: a buffer amplifier 10314. A first input terminal of the buffer amplifier 10314 is connected to the second terminal of the second switch K2, a second input terminal of the buffer amplifier 10314 is connected to the second terminal of the fourth switch K4, a first output terminal of the buffer amplifier 10314 is connected to the first input terminal of the analog-to-digital converter 10311, and a second output terminal of the buffer amplifier 10314 is connected to the second input terminal of the analog-to-digital converter 10311. The buffer amplifier 10314 can perform signal amplification processing on the identification voltage.

[0123] In an embodiment of the present application, the current conversion unit 103 also includes a buffer amplifier 10314. The buffer amplifier 10314 can amplify the identification voltage signal. The buffer amplifier 10314 can be a level converter or a buffer, etc. Specifically, the high level in the identification voltage can be increased and the low level can be reduced to achieve amplification of the signal amplitude, thereby making the identification voltage signal amplitude of the input analog-to-digital converter 10311 larger, avoiding the inability to recognize touch due to the small identification voltage causing the analog-to-digital converter 10311 to be unable to convert into a touch signal, thereby improving the accuracy of touch recognition.

[0124] The embodiment of the present application further provides a touch chip 103, which is connected to an electrode 101. The electrode 101 includes multiple horizontal electrodes and multiple vertical electrodes. At least two electrodes 101 are connected via a switch tube 102. The touch chip 103 can send a drive signal to the electrode 101. After the switch tube 102 is closed to connect the at least two electrodes 101 to form at least one induction loop, the touch chip 103 performs mutual induction with an external dynamic coil and performs touch position recognition based on the signal after the mutual induction. The at least two electrodes 101 include at least one of a horizontal electrode and a vertical electrode.

[0125] In the embodiment of the present application, the touch chip 103 may be the touch chip 103 in any of the above embodiments, and may perform the operations in any of the above embodiments, which will not be described in detail here.

[0126] FIG19 is a schematic diagram of a display screen module provided in an embodiment of the present application. As shown in FIG19 , the display screen module 300 includes the touch device 100 in any of the above embodiments.

[0127] It should be understood that the multiple switch transistors 102 in the touch device 100 may be multiple switch transistors 102 in the TFT layer of the display screen module 300 , and this embodiment of the present application does not impose any limitation thereto.

[0128] Figure 20 is a schematic diagram of an electronic device provided in an embodiment of the present application. As shown in Figure 20, the electronic device 400 includes a processor 401 and the display screen module 300 in the above embodiment. The processor 401 is electrically connected to the display screen module 300. The processor 401 is used to send a control signal to the touch device 100 to close the switch tube 102 in the touch device 100.

[0129] In the embodiment of the present application, the processor 401 can send a control signal to the touch device 100 to close the switch tube 102 in the touch device 100, so that the electrode 101 forms at least one induction loop, thereby enabling mutual induction with the external dynamic coil through the induction loop. The touch device 100 in the embodiment of the present application uses the mutual induction between the coils for touch recognition. Since the underwater environment has little impact on the mutual induction between the coils, compared with the capacitive touch recognition solution in the prior art, the touch device 100 can be suitable for touch recognition in underwater environments. When the switch tube 102 is not closed, the touch device 100 can perform traditional capacitive touch recognition and can be suitable for touch recognition in ordinary environments. Therefore, the touch device 100 can be used for touch recognition in a variety of usage scenarios and has high applicability.

[0130] Figure 21 is a schematic diagram of a touch device provided in an embodiment of the present application. As shown in Figure 21, the touch device includes a dynamic coil 200. As shown in Figure 20, the touch device can be a glove including the dynamic coil 200, a dynamic coil 200 attached to a finger, or a stylus integrated with the dynamic coil 200. In one example, the dynamic coil 200 can be a planar coil composed of multiple turns of copper wire, and the dynamic coil 200 can be double-sidedly bonded and protected with a soft material.

[0131] FIG22 is a schematic diagram of a moving coil provided in an embodiment of the present application. As shown in FIG22 , the touch device further includes: a fifth capacitor C5 , and the moving coil 200 is connected in series with the fifth capacitor C5 .

[0132] The moving coil 200 can generate mutual inductance with the induction circuit in the touch device 100. FIG23 is an equivalent circuit diagram of mutual inductance provided in an embodiment of the present application. As shown in FIG23 , the induction circuit in FIG23 can be the induction circuit in any of the above embodiments. The driving electrodes 101101 in the induction circuit can be equivalent to a first equivalent inductor L1, a first equivalent capacitor C6, and a first equivalent resistor R3. Under the drive of the driving signal, a driving current is generated in the induction circuit. The moving coil 200 can be equivalent to a second equivalent inductor L2 and a second equivalent resistor R4. The moving coil 200 is connected in series with a fifth capacitor C5. The moving coil 200 can generate mutual inductance with the induction circuit.

[0133] It should be understood that the second equivalent inductor L2 and the fifth capacitor C5 can form an LC circuit, and the resonant frequency of the moving coil 200 can be adjusted by adjusting the Q value of the LC circuit. Specifically, due to The resonant frequency of the moving coil 200 can be adjusted by adjusting the size of the fifth capacitor C5 connected in series with the moving coil 200, or by adjusting the size of the second equivalent inductor L2 in the moving coil 200, for example, by adjusting the number of turns of the moving coil 200. The frequency range of the driving signal driving the induction loop is [50k, 500k], the resonant frequency range of the LC circuit is [50k, 500k], the Q value range is [2, 10], the value range of R4 is [1Ω, 500Ω], the value range of L2 is [1nh, 1mh], and the value range of C5 is [10pf, 100Uf]. In another example, the resonant frequency of the moving coil 200 can be adjusted by using the parasitic capacitance in the coil, which will not be repeated here.

[0134] FIG24 is a schematic diagram of a relationship between a resonant frequency and a gain provided in an embodiment of the present application. As shown in FIG24 , when the frequency of the driving signal driving the induction loop is 100 kHz, the closer the resonant frequency of the moving coil 200 is to 100 Hz, the greater the gain of the mutual inductance, and the higher the sensitivity of the touch recognition. As shown in the gain curve in FIG24 , from top to bottom, they are AM1

[0010] to AM1[1], and the inductance values ​​decrease in sequence. According to the inductance values ​​in the figure, the smaller the value of the equivalent inductance L2, the higher the gain.

[0135] In the embodiment of the present application, the moving coil 200 is connected in series with a fifth capacitor C5, so that the frequency of the LC resonance of the moving coil 200 can be adjusted by the fifth capacitor C5, so that the LC resonance of the moving coil 200 is close to the driving frequency of the induction loop, thereby increasing the gain of the mutual inductance and improving the sensitivity of touch recognition.

[0136] It should be understood that the various embodiments in this specification are described in a progressive manner. References to the same or similar parts of the various embodiments will be sufficient. Each embodiment focuses on the differences from the other embodiments. In particular, the method embodiments are generally similar to the methods described in the device and system embodiments, so their description is relatively simple. For relevant details, references to the descriptions of the other embodiments will suffice.

[0137] It should be understood that the foregoing description of this specification is based on specific embodiments. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0138] It should be understood that an element described herein in the singular or shown in the drawings as only one does not limit the number of the element to one. In addition, modules or elements described or shown herein as separate may be combined into a single module or element, and modules or elements described or shown herein as single may be split into multiple modules or elements.

[0139] It should also be understood that the terms and expressions used herein are for descriptive purposes only, and the one or more embodiments of this specification should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or portions thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

Claims

1. A touch device, characterized in that: include: A touch chip, configured to send a driving signal to the electrodes; The electrodes include a plurality of transverse electrodes and a plurality of longitudinal electrodes; A switching tube, wherein at least two electrodes are connected via the switching tube. When the switching tube is closed, the at least two electrodes are connected to form at least one induction loop. The induction loop is used to perform mutual induction with an external dynamic coil. The touch chip performs touch position recognition based on a signal after the mutual induction. The at least two electrodes include at least one of the horizontal electrode and the vertical electrode.

2. The touch device according to claim 1, wherein: After the switch tube is disconnected, the electrodes are all in a disconnected state, the touch chip sends a driving signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and performs position recognition according to the sensing signal output by the other of the multiple horizontal electrodes and the multiple vertical electrodes.

3. The touch device according to claim 2, wherein: One of the plurality of transverse electrodes and the plurality of longitudinal electrodes serves as both a driving electrode and a receiving electrode. The touch control chip sends a driving signal to the driving electrode and performs position recognition according to a sensing signal output by the receiving electrode.

4. The touch device according to claim 1, wherein: At least two of the electrodes are one of the horizontal electrodes and the vertical electrodes, and the at least two electrodes include a first electrode and a second electrode arranged adjacent to each other. When the switch tube is closed, the first electrode and the second electrode are connected to form the induction loop.

5. The touch device according to claim 4, wherein: The at least two electrodes are connected via the switch tube, comprising: One end of the first electrode is connected to the touch chip, and the other end of the first electrode is connected to one end of the switch tube; One end of the second electrode is connected to the touch chip, and the other end of the second electrode is connected to the other end of the switch tube.

6. The touch device according to claim 1, wherein: At least two of the electrodes are one of the transverse electrodes and the longitudinal electrodes, the at least two electrodes include at least three electrodes arranged adjacent to each other, and the switching tube includes at least two switching tubes, which, when closed, connect the at least three electrodes to form the induction loop.

7. The touch device according to claim 6, wherein: When the induction loop includes i electrodes, the first end of the Kth electrode among the i electrodes and the first end of the Lth electrode among the i electrodes are connected through a switch tube, and the second end of the K+1th electrode among the i electrodes and the second end of the Lth electrode among the i electrodes are connected through a switch tube, wherein K+L=i+1, when i is an odd number, the second end of the Kth electrode among the i electrodes is connected to the touch chip, and the The first end of the electrode is connected to the touch chip. When i is an even number, the second end of the Kth electrode among the i electrodes is connected to the touch chip. The second end of each electrode is connected to the touch chip, and i is a positive integer greater than or equal to 3.

8. The touch control device according to any one of claims 1 to 7, wherein: The induction loop includes an induction loop formed by one of the transverse electrode and the longitudinal electrode; The touch chip is used to send a driving signal to the induction loop, and the induction loop and the dynamic coil perform mutual induction. The touch chip recognizes the touch position according to the change of the signal in the induction loop after mutual induction.

9. The touch control device according to any one of claims 1 to 7, wherein: The at least one induction loop includes a first induction loop and a second induction loop; The first induction loop includes an induction loop formed by one of the transverse electrode and the longitudinal electrode, and the second induction loop includes an induction loop formed by the other of the transverse electrode and the longitudinal electrode; The touch control chip is used to send a driving signal to the first induction loop, and the first induction loop and the dynamic coil generate mutual induction, so that an induced current is generated in the dynamic coil; The second induction loop is used for mutual induction with the first induction loop and / or the dynamic coil, and the touch chip recognizes the touch position according to the signal after the mutual induction of the second induction loop.

10. The touch device according to claim 9, wherein: The touch control chip is used to continuously send a driving signal to the first sensing loop; The moving coil is used for mutual induction with the first induction loop to change the current in the first induction loop; The second induction circuit is used for mutual induction with the first induction circuit and the dynamic coil, and the touch chip recognizes the touch position according to the signal after the mutual induction of the second induction circuit.

11. The touch device according to claim 9, wherein: The touch control chip is used to intermittently send a driving signal to the first sensing loop; The moving coil is configured to generate an induced current in the moving coil by mutual induction with the first induction loop when the touch control chip sends a driving signal to the first induction loop; The second induction circuit is used to generate mutual induction with the dynamic coil when the touch chip does not send a driving signal to the first induction circuit, and the touch chip performs touch position recognition according to the signal generated by the mutual induction of the second induction circuit.

12. The touch device according to claim 1, wherein: The touch control chip includes a current conversion unit and a processing unit; The current conversion unit is used to generate a touch signal according to a signal generated by mutual induction between the induction loop and the dynamic coil; The processing unit is configured to identify a touch position according to the touch signal.

13. The touch device according to claim 12, wherein: The current conversion unit includes a transimpedance amplifier, a first resistor, a second resistor, a first feedback resistor, a second feedback resistor, a first capacitor, a second capacitor and an analog-to-digital converter; A first end of the first resistor is connected to the output end of the induction loop, a second end of the first resistor is connected to the positive input end of the transimpedance amplifier, a first end of the second resistor is connected to a reference voltage, a second end of the second resistor is connected to the negative input end of the transimpedance amplifier, a negative output end of the transimpedance amplifier is connected to the first input end of the analog-to-digital converter, and a positive output end of the transimpedance amplifier is connected to the second input end of the analog-to-digital converter; The first end of the first feedback resistor is connected to the positive input terminal of the transimpedance amplifier, the second end of the first feedback resistor is connected to the negative output terminal of the transimpedance amplifier, the first end of the second feedback resistor is connected to the negative input terminal of the transimpedance amplifier, and the second end of the first feedback resistor is connected to the positive output terminal of the transimpedance amplifier; The first end of the first capacitor is connected to the first end of the first feedback resistor, the second end of the first capacitor is connected to the second end of the first feedback resistor, the first end of the second capacitor is connected to the first end of the second feedback resistor, and the second end of the second capacitor is connected to the second end of the second feedback resistor; The transimpedance amplifier is used to convert the signal after the mutual induction between the induction loop and the moving coil into an identification voltage; The analog-to-digital converter is used to receive the identification voltage and convert the identification voltage into the touch signal.

14. The touch device according to claim 13, wherein: The current conversion unit further includes: a low-pass filter; The first input end of the low-pass filter is connected to the negative output end of the transimpedance amplifier, the second input end of the low-pass filter is connected to the positive output end of the transimpedance amplifier, the first output end of the low-pass filter is connected to the first input end of the analog-to-digital converter, and the second output end of the low-pass filter is connected to the second input end of the analog-to-digital converter; The low-pass filter is used to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

15. The touch device according to claim 14, wherein: The current conversion unit further includes: a sampling and holding module; The sampling and holding module includes a first switch, a second switch, a third switch, a fourth switch, a third capacitor and a fourth capacitor; A first end of the first switch is connected to the first output end of the low-pass filter, a second end of the first switch is connected to the first end of the third capacitor and the first end of the second switch, a second end of the second switch is connected to the first input end of the analog-to-digital converter, and a second end of the third capacitor is grounded; A first end of the third switch is connected to the second output end of the low-pass filter, a second end of the third switch is connected to both the first end of the fourth capacitor and the first end of the fourth switch, a second end of the fourth switch is connected to the second input end of the analog-to-digital converter, and a second end of the fourth capacitor is grounded; The sampling and holding module is used to hold the identification voltage.

16. The touch device according to claim 15, wherein: 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 second switch, the second input terminal of the buffer amplifier is connected to the second terminal of the fourth switch, the first output terminal of the buffer amplifier is connected to the first input terminal of the analog-to-digital converter, and the second output terminal of the buffer amplifier is connected to the second input terminal of the analog-to-digital converter; The buffer amplifier is used to perform signal amplification processing on the identification voltage.

17. A touch chip, characterized in that: The electrodes include a plurality of transverse electrodes and a plurality of longitudinal electrodes, and at least two electrodes are connected via the switch tube; The touch chip is configured to send a drive signal to the electrode, and after the switch tube is closed to connect the at least two electrodes to form at least one induction loop, perform mutual induction with an external dynamic coil, and perform touch position recognition based on the signal after the mutual induction, wherein the at least two electrodes include at least one of the horizontal electrode and the vertical electrode.

18. A display screen module, characterized in that: The invention comprises a touch control device as claimed in any one of claims 1 to 16.

19. An electronic device, characterized in that: comprising a processor and the display screen module according to claim 18; The processor is electrically connected to the display screen module; The processor is configured to send a control signal to the touch control device to close at least some of the switch tubes included in the touch control device.

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