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

Abstract

Embodiments of the present application provide a touch apparatus, a touch chip, a display screen module, and an electronic device, the touch apparatus being disposed on the electronic device. The touch apparatus comprises: a touch chip, the touch chip being used to transmit a first driving signal when in a first touch mode. The first driving signal is used for generating a second driving signal, and when touched by a finger, the touch chip, the finger and an electrode on a touch screen form a closed loop, and the second driving signal is transmitted in the closed loop, causing the closed loop to generate a first sensing signal, and the touch chip performs touch position recognition on the basis of the first sensing signal. The touch apparatus provided in the present application can be used for touch position recognition in a non-direct finger contact touch control scenario, and the usability is high.

Description

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

[0001] This application claims priority to the invention application filed on May 30, 2024, with application number "PCT / CN2024 / 096492" and patent title "Touch Device, Touch Chip, Display Screen Module and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of touch chip technology, and more particularly to a touch device, touch chip, display screen module, and electronic device. Background Technology

[0003] Touch technology is a human-computer interaction method. Users interact with electronic devices by touching or gesturing on the touch area of ​​the electronic device. With the development of smart devices, touch technology has become the mainstream operation method for mobile phones and other electronic devices. Mobile phones and other electronic devices receive touch commands input by users on the display screen and recognize the corresponding touch operations according to the touch commands.

[0004] Currently, electronic devices use self-capacitance and / or mutual capacitance electrodes to identify the user's touch position on the display screen.

[0005] However, in scenarios where the user's finger does not directly touch the display screen (e.g., when the user is wearing gloves), the electronic device cannot recognize the touch position of the user's finger due to the low signal quantity generated by the self-capacitance and / or mutual capacitance of the electrodes. Summary of the Invention

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

[0007] According to a first aspect of the present application, a touch device is provided, disposed in an electronic device, including: a touch chip; the touch chip is configured to send a first driving signal when in a first touch mode; the first driving signal is used to generate a second driving signal, wherein when a finger touches the device, the touch chip, the finger, and electrodes on the touch screen form a closed loop, the second driving signal is transmitted in the closed loop, thereby generating a first sensing signal in the closed loop, and the touch chip performs touch position recognition based on the first sensing signal.

[0008] In one possible implementation, the touch device further includes a level conversion unit; the level conversion unit is configured to receive the first driving signal, generate a second driving signal based on the first driving signal, and send the second driving signal to the touch chip.

[0009] In one possible implementation, the touch chip is configured to, when in a second touch mode, stop sending the first driving signal to the level conversion unit and send a third driving signal to the electrode, and perform touch position recognition based on the second sensing signal output by the electrode, wherein the electrode includes a plurality of horizontal electrodes and / or a plurality of vertical electrodes.

[0010] In one possible implementation, the touch chip is configured to send the first driving signal to the level conversion unit and the third driving signal to the electrode when in a third touch mode, and to identify the touch position based on the first sensing signal and the second sensing signal when touched by a finger.

[0011] In one possible implementation, the touch chip is configured to alternately output the first driving signal and the third driving signal according to a timing sequence, and switch to the first touch mode when the second sensing signal is less than the first signal threshold, and switch to the second touch mode when the second sensing signal is greater than the second signal threshold.

[0012] In one possible implementation, the touch chip is configured to switch to the first touch mode when receiving a first control signal from the electronic device, switch to the second touch mode when receiving a second control signal from the electronic device, and switch to the third touch mode when receiving a third control signal from the electronic device.

[0013] In one possible implementation, the touch chip outputs the third driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and receives the second sensing signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes; or, at least one of the plurality of horizontal electrodes and the plurality of vertical electrodes serves as both a driving electrode and a receiving electrode, and the touch chip sends the second driving signal to the driving electrode and receives the second sensing signal output by the receiving electrode.

[0014] In one possible implementation, the input pin of the level conversion unit is electrically connected to the first pin of the touch chip, and the first output pin of the level conversion unit is electrically connected to the ground pin of the touch chip; the touch chip sends the first driving signal to the level conversion unit through the first pin, and the level conversion unit sends the second driving signal to the ground pin through the first output pin; when the finger touches the touch, the finger forms a closed loop with the electrode and the ground pin, so that the closed loop generates the first sensing signal.

[0015] In one possible implementation, the second output pin of the level conversion unit is connected to the power supply pin of the touch chip; the level conversion unit is used to transmit a power supply voltage to the touch chip through the power supply pin, and the voltage difference between the power supply voltage and the second driving signal is equal to the power supply voltage of the touch chip.

[0016] In one possible implementation, the level conversion unit includes N sub-circuits, where N is an integer greater than or equal to 2. The first sub-circuit of the N sub-circuits includes a first switch, a second switch, and a first capacitor. The first terminal of the first switch is connected to a power supply, the second terminal of the first switch is connected to a second output pin, the first terminal of the first capacitor is connected to the second output pin, the second terminal of the first capacitor is connected to both the first terminal of the second switch and the first output pin, and the second terminal of the second switch is grounded. The i-th sub-circuit of the N sub-circuits includes a third switch, a fourth switch, a fifth switch, and a second capacitor. The first terminal of the third switch is connected to the power supply, the second terminal of the third switch is connected to the first terminal of the fourth switch, the second terminal of the fourth switch is connected to the second terminal of the capacitor in the (i-1)-th sub-circuit, the first terminal of the second capacitor is connected to the second terminal of the third switch, and the second terminal of the second capacitor is grounded. The second terminal is connected to the first terminal of the fifth switch, and the second terminal of the fifth switch is grounded, where i is an integer greater than 1 and less than N; the Nth sub-circuit of the N sub-circuits includes a sixth switch, the first terminal of the sixth switch is connected to the power supply, and the second terminal of the sixth switch is connected to the second terminal of the capacitor in the (N-1)th sub-circuit; the level conversion unit is used to control the on / off state of the switches in the N sub-circuits according to the first driving signal, so that the on / off states of the first switch, the second switch, the third switch and the fifth switch are the same, and the on / off states of the fourth switch and the sixth switch are the same, and the on / off states of the first switch and the sixth switch are opposite, when the first switch is closed, a low level of the second driving signal is generated on the first output pin, and when the sixth switch is closed, a high level of the second driving signal is generated on the first output pin, and the output voltage of the power supply is equal to the power supply voltage of the touch chip.

[0017] In one possible implementation, the level conversion unit includes: a seventh switch, an eighth switch, a ninth switch, a third capacitor, and a DC-DC voltage conversion unit; the first terminal of the seventh switch is connected to a power supply, the second terminal of the seventh switch is connected to a second output pin, the first terminal of the third capacitor is connected to the second output pin, the second terminal of the third capacitor is connected to both the first terminal of the eighth switch and the first output pin, and the second terminal of the eighth switch is grounded; the input terminal of the DC-DC voltage conversion unit is connected to a power supply, the output terminal of the DC-DC voltage conversion unit is connected to the first terminal of the ninth switch, and the second terminal of the ninth switch is connected to the second terminal of the third capacitor; the DC-DC voltage conversion unit is used to boost or buck the output voltage of the power supply; the level conversion unit is used to control the on / off states of the seventh switch, the eighth switch, and the ninth switch according to the first driving signal, such that the on / off states of the seventh switch and the eighth switch are the same, and the on / off states of the seventh switch and the ninth switch are opposite; when the seventh switch is closed, a low level of the second driving signal is generated at the first output pin, and when the ninth switch is closed, a high level of the second driving signal is generated at the first output pin; the output voltage of the power supply is equal to the supply voltage of the touch chip.

[0018] In one possible implementation, the level conversion unit further includes: a first communication unit; a first end of the first communication unit is connected to a first communication pin of the processor of the electronic device, and a second end of the first communication unit is connected to a second communication pin of the touch chip; the first communication unit is used to perform buck-boost processing on the communication signal between the touch chip and the processor.

[0019] In one possible implementation, the touch device further includes: a second communication unit and a plurality of third communication units; a first end of the second communication unit is connected to a chip select signal output pin of the processor of the electronic device, and a second end of the second communication unit is connected to a chip select signal receiving pin of the touch chip; a first end of the third communication unit is connected to a third communication pin of the processor, and a second end of the third communication unit is connected to a fourth communication pin of the touch chip; the processor includes a plurality of third communication pins, the touch chip includes a plurality of fourth communication pins, and different third communication units are respectively connected to different third communication pins and fourth communication pins; the second communication unit is used to receive the chip select signal output by the processor and send the chip select signal to the touch chip; the third communication unit is used to transmit data between the processor and the touch chip.

[0020] In one possible implementation, the second communication unit includes a first enhancement-mode NMOS transistor, a first resistor, and a second resistor; the third communication unit includes a second enhancement-mode NMOS transistor, a third resistor, and a fourth resistor; a first terminal of the first resistor is connected to the chip select signal output pin, a second terminal of the first resistor is connected to the voltage output pin of the processor, the source of the first enhancement-mode NMOS transistor is connected to both the chip select signal output pin and the first terminal of the first resistor, the gate of the first enhancement-mode NMOS transistor is connected to both the voltage output pin and the second terminal of the first resistor, the drain of the first enhancement-mode NMOS transistor is connected to both the first terminal of the second resistor and the chip select signal receiving pin, and a second terminal of the second resistor is connected to the second output pin; a first terminal of the third resistor is connected to the third communication pin, a second terminal of the third resistor is connected to the voltage output pin, the source of the second enhancement-mode NMOS transistor is connected to both the third communication pin and the first terminal of the third resistor, the gate of the second enhancement-mode NMOS transistor is connected to the chip select signal output pin, the drain of the second enhancement-mode NMOS transistor is connected to both the first terminal of the fourth resistor and the fourth communication pin, and a second terminal of the fourth resistor is connected to the second output pin.

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

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

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

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

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

[0026] In one possible implementation, the touch chip further includes a demodulation circuit; the demodulation circuit is used to demodulate the recognition signal to obtain a demodulated signal, and send the demodulated signal to the processing unit so that the processing unit can perform touch position recognition based on the demodulated signal.

[0027] In one possible implementation, the demodulation circuit includes a first demodulation branch and a second demodulation branch; the first demodulation branch is used to perform sinusoidal demodulation on the identification signal to obtain a first demodulation sub-signal, and the second demodulation branch is used to perform cosine demodulation on the identification signal to obtain a second demodulation sub-signal; the demodulation circuit is used to generate the demodulated signal based on the first demodulation sub-signal and the second demodulation sub-signal.

[0028] According to a second aspect of the present application, a touch chip is provided, which is used to send a first driving signal when in a first touch mode, the first driving signal being used to generate a second driving signal, and forming a closed loop with the finger and electrodes on the touch screen when touched by a finger, and performing touch position recognition based on a first sensing signal generated in the closed loop.

[0029] According to a third aspect of the present application, a display screen module is provided, including a touch device and electrodes as described in the first aspect of the present application, wherein the electrodes are used to form a closed loop with the touch chip and the finger when touched by a finger, wherein the electrodes include horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0030] According to a fourth aspect of the embodiments of this application, an electronic device is provided, including a processor and a display screen module as described in the third aspect of the embodiments of this application.

[0031] According to the touch device provided in the embodiments of this application, the touch device includes a touch chip. When in a first touch mode, the touch chip sends a first driving signal and receives a second driving signal generated based on the first driving signal. When a finger touches the device, the touch chip, the finger, and the electrodes form a closed loop. Since the touch chip receives the second driving signal, it can transmit the second driving signal within the closed loop, thereby generating a first sensing signal within the closed loop. Thus, the touch chip can identify the touch position based on the first sensing signal. Since the touch position identification is not based on the capacitance change of the electrodes before and after the finger touches the device, but rather on the generation of a closed loop when the finger touches the device, and the transmission of the second driving signal within the closed loop to generate the first sensing signal, compared with the prior art of touch position identification through electrode self-capacitance or mutual capacitance, this touch device can be applied to touch scenarios where the finger does not directly contact the device, such as when the user is wearing gloves. Therefore, this touch device can be applied to touch position identification in various usage scenarios and has high applicability. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0033] Figure 1 is a schematic diagram of a touch device provided in an embodiment of this application;

[0034] Figure 2 is a schematic diagram of an equivalent circuit of a closed loop provided in an embodiment of this application;

[0035] Figure 3 is a schematic diagram of another touch device provided in an embodiment of this application;

[0036] Figure 4 is a schematic diagram of a touch device in a second touch mode provided in an embodiment of this application;

[0037] Figure 5 is a timing diagram of the output signal of a touch chip provided in an embodiment of this application;

[0038] Figure 6 is a timing diagram of another touch chip output signal provided in an embodiment of this application;

[0039] Figure 7 is a schematic diagram of a signal detection timing provided in an embodiment of this application;

[0040] Figure 8 is a schematic diagram of a level conversion unit provided in an embodiment of this application;

[0041] Figure 9 is a circuit diagram of a level conversion unit provided in an embodiment of this application;

[0042] Figure 10 is a schematic diagram of an example of a level conversion unit provided in an embodiment of this application;

[0043] Figure 11 is a schematic diagram of another example of a level conversion unit provided in an embodiment of this application;

[0044] Figure 12 is a schematic diagram of an output voltage timing provided in an embodiment of this application;

[0045] Figure 13 is a circuit diagram of another level conversion unit provided in an embodiment of this application;

[0046] Figure 14 is a schematic diagram of another level conversion unit provided in an embodiment of this application;

[0047] Figure 15 is a schematic diagram of a touch device including a communication unit provided in an embodiment of this application;

[0048] Figure 16 is a schematic diagram of a second communication unit and a third communication unit provided in an embodiment of this application;

[0049] Figure 17 is a schematic diagram of a touch chip provided in an embodiment of this application;

[0050] Figure 18 is a circuit diagram of a current conversion unit provided in an embodiment of this application;

[0051] Figure 19 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0052] Figure 20 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0053] Figure 21 is a circuit diagram of another current conversion unit provided in an embodiment of this application;

[0054] Figure 22 is a schematic diagram of a demodulation circuit provided in an embodiment of this application;

[0055] Figure 23 is a schematic diagram of an IQ demodulation principle provided in an embodiment of this application;

[0056] Figure 24 is a schematic diagram of a display screen module provided in an embodiment of this application;

[0057] Figure 25 is a schematic diagram of an electronic device provided in an embodiment of this application;

[0058] Figure 26 is a schematic diagram of the switching principle of an electronic device provided in an embodiment of this application. Detailed Implementation

[0059] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0060] As mentioned earlier, touch technology is a human-computer interaction method. Users interact with electronic devices by touching or gesturing on the touch area. With the development of smart devices, touch technology has become the mainstream operating method for mobile phones and other electronic devices. Mobile phones and other electronic devices receive touch commands input by users on the display screen and recognize the corresponding touch operations based on the commands. Currently, electronic devices use electrode self-capacitance and / or mutual capacitance to identify the user's touch position on the display screen. However, in scenarios where the user's finger does not directly contact the display screen (e.g., when the user is wearing gloves), the signal strength generated by electrode self-capacitance and / or mutual capacitance is low, causing the electronic device to be unable to recognize the user's finger touch position.

[0061] This application provides a touch device including a touch chip. In a first touch mode, the touch chip sends a first driving signal and receives a second driving signal generated based on the first driving signal. When a finger touches the device, the touch chip, the finger, and the electrodes form a closed loop. Since the touch chip receives the second driving signal, it can transmit the second driving signal within the closed loop, generating a first sensing signal within the closed loop. Thus, the touch chip can identify the touch position based on the first sensing signal. Because the touch position identification is not based on the capacitance change of the electrodes before and after the finger touch, but rather on the formation of a closed loop when the finger touches the device, and the transmission of the second driving signal within the closed loop to generate the first sensing signal, compared with the prior art of touch position identification through electrode self-capacitance or mutual capacitance, this touch device is applicable to touch scenarios where the finger does not directly contact the device, such as when the user is wearing gloves. Therefore, this touch device is applicable to touch position identification in various usage scenarios and has high applicability.

[0062] The touch device provided in this application is described below through embodiments.

[0063] Figure 1 is a schematic diagram of a touch device provided in an embodiment of this application. As shown in Figure 1, the touch device 100 includes a touch chip 101. The touch chip 101 can send a first driving signal when in a first touch mode. The first driving signal is used to generate a second driving signal. When a finger touches the screen, the touch chip 101, the finger, and the electrode 401 on the touch screen form a closed loop. The second driving signal is transmitted in the closed loop, causing a first sensing signal to be generated in the closed loop. The touch chip 101 performs touch position recognition based on the first sensing signal.

[0064] The first touch mode can be non-direct finger contact touch, such as touching while wearing gloves. The touch chip 101 can send a first driving signal and receive a second driving signal generated according to the first driving signal. In one example, the first driving signal can be a voltage signal with a square wave waveform. When a finger touches the ground, a closed loop is formed between the finger, electrode 401, and touch chip 101. At this time, since touch chip 101 receives a second driving signal, which is a square wave signal, it is equivalent to the presence of a signal source in the closed loop. Specifically, the finger is grounded through the human body, which is equivalent to the existence of an equivalent capacitance between the finger and the ground wire. There is also an equivalent capacitance between the finger and electrode 401. Thus, the ground wire, the equivalent capacitance between the ground wire and the finger, the finger, the equivalent capacitance between the finger and electrode 401, electrode 401, and touch chip 101 form a closed loop. In one example, Figure 2 is a schematic diagram of the equivalent circuit of a closed loop provided in an embodiment of this application. As shown in Figure 2, the finger 300 is equivalent to being grounded through capacitor CHM1, and there is an equivalent capacitance CHT1 between the finger 300 and electrode 401. The equivalent signal source L1 in Figure 2 is the second driving signal received by touch chip 101. It should be understood that since the second driving signal has high and low levels, it is equivalent to generating high and low level coding signals on the finger 300, thereby generating a first sensing signal in the closed loop when the finger 300 is touched.

[0065] The touch chip 101 is electrically connected to the electrode 401. After receiving the first sensing signal transmitted by the electrode 401, the touch chip 101 can identify the touch position based on the first sensing signal. In one example, the touch chip 101 can convert the first sensing signal into a digital signal and identify the touch position of the finger based on the digital signal, and send the touch position to the processor of the electronic device. The processor of the electronic device can then perform the corresponding touch operation.

[0066] In this embodiment, the touch device 100 includes a touch chip 101. When in a first touch mode, the touch chip 101 sends a first driving signal and receives a second driving signal generated based on the first driving signal. When a finger touches the device, the touch chip 101, the finger, and the electrode 401 form a closed loop. Since the touch chip 101 receives the second driving signal, it can transmit the second driving signal within the closed loop, generating a first sensing signal within the closed loop. Thus, the touch chip 101 can identify the touch position based on the first sensing signal. Because the touch position identification is not based on the capacitance change of the electrode 401 before and after the finger touch, but rather on the generation of a closed loop when the finger touches the device, and the transmission of the second driving signal within the closed loop to generate the first sensing signal, compared with the prior art's touch position identification through electrode self-capacitance or mutual capacitance, this touch device 100 is applicable to touch scenarios where the finger does not directly contact the device, such as when the user is wearing gloves. Therefore, this touch device 100 is applicable to touch position identification in various usage scenarios and has high applicability.

[0067] Figure 3 is a schematic diagram of another touch device 100 provided in an embodiment of this application. As shown in Figure 3, the touch device 100 further includes a level conversion unit 102. The level conversion unit 102 is used to receive a first driving signal, generate a second driving signal according to the first driving signal, and send the second driving signal to the touch chip.

[0068] In one example, the first driving signal can be a Sync signal between the touch chip 101 and the level conversion unit 102, which is a square wave signal.

[0069] In this embodiment of the application, the touch device 100 further includes a level conversion unit 102. The level conversion unit 102 can receive a first driving signal and generate a second driving signal according to the first driving signal. This realizes the generation of a second driving signal according to the first driving signal, so that the touch chip 101 can transmit the second driving signal in a closed loop when the finger touches it, and can perform touch position detection in touch scenarios where the finger does not directly contact the touch.

[0070] Figure 4 is a schematic diagram of a touch device in a second touch mode provided in an embodiment of this application. As shown in Figure 4, when the touch chip 101 is in the second touch mode, it can stop sending the first driving signal to the level conversion unit 102, and the touch chip 101 sends the third driving signal to the electrode 401, and performs touch position recognition according to the second sensing signal output by the electrode 401. The electrode 401 includes multiple horizontal electrodes and / or multiple vertical electrodes.

[0071] In the second touch mode, the touch chip 101 stops sending the first driving signal to the level conversion unit 102. Then, the touch chip 101 outputs a third driving signal to the electrode 401. The third driving signal can be a sine wave, a square wave, or a trapezoidal wave, etc. The electrode 401 receives the third driving signal and generates a second sensing signal when touched by a finger. The touch chip 101 identifies the touch position based on the second sensing signal.

[0072] It should be understood that, as shown in Figure 4, the plurality of electrodes 401 include horizontal electrodes and / or multiple vertical electrodes. The touch chip 101 is electrically connected to each electrode 401. When the plurality of horizontal electrodes and / or multiple vertical electrodes generate a second sensing signal, the touch chip 101 can detect the second sensing signal generated in the plurality of horizontal electrodes and / or multiple vertical electrodes.

[0073] In this embodiment, when in the second touch mode, the touch chip 101 stops outputting the first driving signal to the level conversion unit 102 and outputs the third driving signal to the electrode 401. This makes it applicable to touch position recognition in touch scenarios where the finger is in direct contact, and makes the touch device 100 applicable to touch position recognition in various usage scenarios, with high applicability.

[0074] In one possible implementation, the touch chip 101 can send a first driving signal to the level conversion unit 102 and a third driving signal to the electrode 401 when in the third touch mode, and identify the touch position based on the first sensing signal and the second sensing signal when touched by a finger.

[0075] In the third touch mode, the touch chip 101 can simultaneously send a first driving signal to the level conversion unit 102 and a third driving signal to the electrode 401. After receiving the first driving signal, the level conversion unit 102 generates a second driving signal based on the first driving signal and sends the second driving signal to the touch chip 101. When a finger touches the screen, a closed loop is formed between the finger, the electrode 401, and the touch chip 101. The second driving signal is transmitted in the closed loop, causing a first sensing signal to be generated in the closed loop. At the same time, since the touch chip 101 outputs the third driving signal to the electrode 401, when a finger touches the screen, the electrode 401 generates a second sensing signal through self-capacitance or mutual capacitance. The touch chip 101 can identify the touch position based on the first and second sensing signals. In one example, Figure 5 is a timing diagram of the output signal of a touch chip provided in an embodiment of this application. As shown in Figure 5, the touch chip 101 simultaneously sends the first driving signal and the third driving signal. It should be noted that the frequencies of the first driving signal and the third driving signal can be different (for example, as shown in Figure 5). In other examples, the frequencies of the first driving signal and the third driving signal can also be the same. The specific frequencies are not limited here.

[0076] It should be understood that when the user wears gloves, the self-capacitance or mutual capacitance of electrode 401 will also generate part of the second sensing signal, which can make the second sensing signal and the first sensing signal superimposed to form a signal with higher signal strength.

[0077] In this embodiment, the touch chip 101 can send a first driving signal to the level conversion unit 102 and a third driving signal to the electrode 401 when in the third touch mode. When a finger touches the screen, the finger, the electrode 401, and the touch chip 101 form a closed loop, generating a first sensing signal in the closed loop and a second sensing signal on the electrode 401 through self-capacitance or mutual capacitance. Thus, touch position recognition can be performed based on the first and second sensing signals. The touch position can be recognized by the superposition of the second sensing signal with higher signal strength and the first sensing signal, which can improve the sensitivity and accuracy of touch position recognition.

[0078] In one possible implementation, the touch chip 101 can alternately output a first driving signal and a third driving signal according to a timing sequence, and switch to a first touch mode when the second sensing signal is less than the first signal threshold, and switch to a second touch mode when the second sensing signal is greater than the second signal threshold.

[0079] The touch chip 101 can alternately send a first driving signal to the level conversion unit 102 and a third driving signal to the electrode 401 according to a timing sequence. When the touch chip 101 sends the first driving signal to the level conversion unit 102, the level conversion unit 102 can receive the first driving signal, generate a second driving signal based on the first driving signal, and send the second driving signal to the touch chip 101. When a finger touches the screen, the touch position can be identified based on the first sensing signal generated in the closed loop. When the touch chip 101 sends the third driving signal to the electrode 401, the electrode 401 can identify the touch position through self-capacitance or mutual capacitance when a finger touches the screen. Figure 6 is a timing diagram of another touch chip output signal provided in an embodiment of this application. As shown in Figure 6, the touch chip 101 alternately outputs the first driving signal and the third driving signal.

[0080] It should be understood that when touch position recognition is performed using self-capacitance or mutual capacitance, if the finger directly touches the display screen, the signal strength of the generated second sensing signal is high. If the finger does not directly touch the display screen (e.g., touches while wearing gloves), the signal strength of the second sensing signal is low. Therefore, when the second sensing signal is less than the first signal threshold, it can be assumed that the user is touching the display screen without directly touching it with their finger. At this time, the system can switch to the first touch mode and perform touch position recognition through the second driving signal. When the second sensing signal is greater than the second signal threshold, it can be assumed that the user is touching the display screen directly with their finger. At this time, the system can switch to the second touch mode and perform touch position recognition through the self-capacitance or mutual capacitance of electrode 401.

[0081] Optionally, after the touch chip 101 switches to the first touch mode or the second touch mode, if the first sensing signal or the second sensing signal is not detected within a preset time, that is, if the user does not touch within the preset time, it switches back to outputting the first driving signal and the third driving signal alternately according to the timing sequence.

[0082] In this embodiment, the touch chip 101 can output a first driving signal and a third driving signal alternately according to a timing sequence. When the second sensing signal is less than the first signal threshold, it switches to the first touch mode, and when the second sensing signal is greater than the second signal threshold, it switches to the second touch mode. By outputting the first driving signal and the third driving signal alternately according to a timing sequence, automatic touch scene switching can be achieved. The current touch scene of the user can be identified. For example, it can identify whether the user is touching the screen directly or indirectly with their finger, and automatically switch the touch mode suitable for different touch scenes to identify the touch position.

[0083] In one possible implementation, the touch chip 101 can switch to a first touch mode when it receives a first control signal from the electronic device, switch to a second touch mode when it receives a second control signal from the electronic device, and switch to a third touch mode when it receives a third control signal from the electronic device.

[0084] In addition to the automatic switching of touch modes as described in the aforementioned embodiments, the touch modes can also be switched manually by the electronic device. The processor in the electronic device can switch the touch modes by sending a first control signal, a second control signal, or a third control signal to the touch chip 101.

[0085] In one example, the touch mode can be switched by clicking a mode switching control displayed on the screen of the electronic device. Specifically, after the user clicks a non-direct touch button on the screen, the processor in the electronic device sends a first switching signal to the touch chip 101. After clicking a direct touch button on the screen, the processor in the electronic device sends a second switching signal to the touch chip 101. After clicking a signal enhancement touch button on the screen, the processor in the electronic device sends a third switching signal to the touch chip 101.

[0086] In this embodiment, the touch chip 101 can switch to a first touch mode when it receives a first control signal from an electronic device, switch to a second touch mode when it receives a second control signal from an electronic device, and switch to a third touch mode when it receives a third control signal from an electronic device. This enables manual switching of touch modes, allowing users to switch touch modes as needed and providing a high degree of user freedom.

[0087] In one possible implementation, the touch chip 101 outputs a third driving signal to one of a plurality of horizontal electrodes and a plurality of vertical electrodes, and receives a second sensing signal output by the other of the plurality of horizontal electrodes and a plurality of vertical electrodes. Alternatively, at least one of the plurality of horizontal electrodes and a plurality of vertical electrodes serves as both a driving electrode and a receiving electrode, and the touch chip 101 sends a third driving signal to the driving electrode and receives the second sensing signal output by the receiving electrode.

[0088] One of the multiple horizontal electrodes and multiple vertical electrodes serves as a driving electrode. The touch chip 101 outputs a third driving signal to the driving electrode. The other of the multiple horizontal electrodes and multiple vertical electrodes serves as a receiving electrode and outputs a second sensing signal. The touch chip 101 performs touch recognition based on the second sensing signal and can identify the touch position of the finger. This method is a mutual capacitance detection method.

[0089] In addition, in another possible implementation, a self-capacitance detection method can be superimposed to identify the touch position of the finger. At least one of the multiple horizontal electrodes and multiple vertical electrodes serves as both a driving electrode and a receiving electrode. The touch chip 101 sends a third driving signal to the driving electrode and performs position identification based on the second sensing signal output by the receiving electrode. For example, the touch chip 101 outputs a third driving signal to multiple horizontal electrodes (driving electrodes) and simultaneously receives the second sensing signal output by the multiple horizontal electrodes (receiving electrodes); or the touch chip 101 outputs a third driving signal to multiple vertical electrodes (driving electrodes) and simultaneously receives the second sensing signal output by the multiple vertical electrodes (receiving electrodes); or the touch chip 101 simultaneously outputs driving signals to multiple horizontal electrodes and multiple vertical electrodes and simultaneously receives the second sensing signal output by the multiple horizontal electrodes and multiple vertical electrodes. The touch chip 101 performs touch position identification based on the received second sensing signal.

[0090] In one example, when the touch chip 101 performs touch position recognition based on the second sensing signal, it can first detect the second sensing signal generated by the horizontal electrode to obtain the Y-axis coordinate of the touch position, and then detect the second sensing signal generated by the vertical electrode to obtain the X-axis coordinate of the touch position. Alternatively, it can detect the X-axis coordinate first and then the Y-axis coordinate. In another example, the touch chip 101 can simultaneously detect the second sensing signals generated by the horizontal and vertical electrodes to directly obtain the X-axis and Y-axis coordinates of the touch position. In yet another example, the touch chip 101 can detect only the second sensing signal generated by the horizontal or vertical electrode, i.e., only detect the X-axis or Y-axis coordinate of the touch position. This is suitable for scenarios with low detection accuracy requirements. The specific detection method can be set as needed and is not limited here.

[0091] In one example, Figure 7 is a schematic diagram of a signal detection timing provided in an embodiment of this application. As shown in Figure 7, a first driving signal with a duration of t1 is output to the level conversion unit 102. During the time interval 0-t1, signal detection is performed on the vertical electrode in the electrode 401 to determine the vertical coordinate of the touch position. Then, the first driving signal with a duration of t1 is output to the level conversion unit 102 again. During the time interval from t1 to 2*t1, signal detection is performed on the horizontal electrode in the electrode 401 to determine the horizontal coordinate of the touch position. Thus, the horizontal and vertical coordinates of the touch position can be detected within a time interval of 2*t1, and the touch position can be determined.

[0092] In this embodiment, the touch chip 101 can output a third driving signal to the electrode 401. Touch position recognition is performed by the electrode 401 using self-capacitance or mutual capacitance. This is applicable to touch position recognition in touch scenarios where the finger is in direct contact, making the touch device 100 applicable to touch position recognition in various usage scenarios, with high applicability.

[0093] Figure 8 is a schematic diagram of a level conversion unit provided in an embodiment of this application. As shown in Figure 8, the input pin 10211 of the level conversion unit 102 is electrically connected to the first pin 10111 of the touch chip 101, and the first output pin 10212 of the level conversion unit 102 is electrically connected to the ground pin 10112 of the touch chip 101. The touch chip 101 sends a first driving signal to the level conversion unit 102 through the first pin 10111, and the level conversion unit 102 sends a second driving signal to the ground pin 10112 through the first output pin 10212. When a finger touches the ground, the finger forms a closed loop with the electrode 401 and the ground pin 10112, so that the closed loop generates a first sensing signal.

[0094] The level conversion unit 102 can receive a first driving signal output by the touch chip 101 through the first pin 10111 via the input pin 10211. In one example, the first driving signal can be a Sync signal between the touch chip 101 and the level conversion unit 102, and the Sync signal is a square wave signal. After receiving the first driving signal, the level conversion unit 102 generates a second driving signal based on the first driving signal.

[0095] After the level conversion unit 102 generates the second driving signal, it sends the second driving signal to the ground pin 10112 of the touch chip 101 through the first output pin 10212, which is equivalent to suspending the voltage of the ground line of the touch chip 101. When the finger touches, a closed loop is formed between the finger, the electrode 401 and the ground pin 10112 of the touch chip 101 (equivalent circuit as shown in Figure 2). When the finger 300 touches, a first sensing signal is generated in the closed loop.

[0096] In this embodiment, the level conversion unit 102 receives the first driving signal and generates a second driving signal. Thus, when a finger touches the screen, the finger, electrode 401, and ground pin 10112 form a closed loop. The second driving signal can be transmitted within this closed loop to generate a first sensing signal. Electrode 401 can then transmit the first sensing signal to the touch chip 101, which is electrically connected to electrode 401. The touch chip 101 can then identify the touch position based on the first sensing signal. Since the touch position identification is not based on the capacitance change of electrode 401 before and after a finger touch, but rather on the generation of a closed loop during finger touch, and the transmission of the second driving signal within this closed loop to generate the first sensing signal, compared to the prior art's touch position identification through electrode self-capacitance or mutual capacitance, this touch device 100 is applicable to touch scenarios where the finger does not directly contact the screen, such as when the user is wearing gloves. Therefore, this touch device 100 is applicable to touch position identification in various usage scenarios and has high applicability.

[0097] In one possible implementation, as shown in Figure 8, the second output pin 10213 of the level conversion unit 102 is connected to the power supply pin 10113 of the touch chip 101. The level conversion unit 102 can transmit power supply voltage to the touch chip 101 through the power supply pin 10113. The voltage difference between the power supply voltage and the second driving signal is equal to the power supply voltage of the touch chip 101.

[0098] The second output pin 10213 of the level conversion unit 102 transmits power supply voltage to the power supply pin 10113 of the touch chip 101. The voltage difference between the power supply pin 10113 and the ground pin 10112 of the touch chip 101 is the power supply voltage of the touch chip 101. That is, the voltage difference between the power supply voltage and the voltage of the second driving signal is equal to the power supply voltage of the touch chip 101.

[0099] In one example, the power supply voltage fluctuates according to the voltage fluctuation of the second drive signal, and the voltage difference between the power supply voltage and the second drive signal is constant at 3V. For example, when the second drive signal is a low level signal 0V, the power supply voltage is 3V, and when the second drive signal is a high level signal 12V, the power supply voltage is 15V, and the voltage difference between the power supply voltage and the second drive signal is constant at 3V.

[0100] In this embodiment, the level conversion unit 102 can transmit power supply voltage to the touch chip 101 through the power supply pin 10113. This ensures that the power supply voltage of the touch chip 101 remains constant when the voltage of the ground pin 10112 of the touch chip 101 is the second driving signal output by the level conversion unit 102, thus guaranteeing the stable power supply of the touch chip 101 and enabling the touch chip 101 to work normally.

[0101] Figure 9 is a circuit diagram of a level conversion unit provided in an embodiment of this application. As shown in Figure 9, the level conversion unit 102 includes N sub-circuits, where N is an integer greater than or equal to 2. The first sub-circuit among the N sub-circuits includes a first switch K1, a second switch K2, and a first capacitor C1. The first terminal of the first switch K1 is connected to the power supply AVDD, and the second terminal of the first switch K1 is connected to the second output pin 10213. The first terminal of the first capacitor C1 is connected to the second output pin 10213, and the second terminal of the first capacitor C1 is connected to the first terminal of the second switch K2 and the first output pin 10212, respectively. The second terminal of the second switch K2 is grounded.

[0102] The i-th sub-circuit in the N sub-circuits includes a third switch K3, a fourth switch K4, a fifth switch K5, and a second capacitor C2. The first terminal of the third switch K3 is connected to the power supply AVDD, the second terminal of the third switch K3 is connected to the first terminal of the fourth switch K4, the second terminal of the fourth switch K4 is connected to the second terminal of the capacitor in the (i-1)-th sub-circuit, the first terminal of the second capacitor C2 is connected to the second terminal of the third switch K3, the second terminal of the second capacitor C2 is connected to the first terminal of the fifth switch K5, and the second terminal of the fifth switch K5 is grounded. Here, i is an integer greater than 1 and less than N.

[0103] The Nth sub-circuit in the N sub-circuit includes a sixth switch K6. The first end of the sixth switch K6 is connected to the power supply AVDD, and the second end of the sixth switch K6 is connected to the second end of the capacitor in the (N-1)th sub-circuit.

[0104] The level conversion unit 102 is used to control the on / off state of switches in N sub-circuits according to the first drive signal, so that the on / off states of the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 are the same, and the on / off states of the fourth switch K4 and the sixth switch K6 are the same, while the on / off states of the first switch K1 and the sixth switch K6 are opposite. When the first switch K1 is closed, a low level of the second drive signal is generated on the first output pin 10212, and when the sixth switch K6 is closed, a high level of the second drive signal is generated on the first output pin 10212. The output voltage of the power supply AVDD is equal to the power supply voltage of the touch chip 101.

[0105] The level conversion unit 102 controls the on / off state of the switches in N sub-circuits according to the first drive signal. In one example, when the first drive signal is at the first level, the first switch K1, the second switch K2, the third switch K3, and the fifth switch K5 are closed, and the fourth switch K4 and the sixth switch K6 are open. At this time, the capacitors in the circuit are charged through the power supply AVDD. When the first drive signal is at the second level, the first switch K1, the second switch K2, the third switch K3, and the fifth switch K5 are open, and the fourth switch K4 and the sixth switch K6 are closed. The capacitors and the power supply AVDD together output voltage to the first output pin 10212 and the second output pin 10213 of the level conversion unit 102. It should be understood that since the first output pin 10212 and the second output pin 10213 are connected to the first capacitor C1, the voltage output by the first capacitor C1 is always different between the first output pin 10212 and the second output pin 10213.

[0106] The following explanation uses a power supply AVDD with an output voltage of 3V, and takes N=2 and N=3 as examples.

[0107] Figure 10 is a schematic diagram of an example of a level conversion unit provided in an embodiment of this application. As shown in Figure 10, when N=2, only the first sub-circuit and the second sub-circuit exist. As shown in Figure 10(a), when the first drive signal is the first level, the first switch K1 and the second switch K2 are closed, and the sixth switch K6 is open. At this time, the power supply AVDD charges the first capacitor C1, and the charging voltage of the first capacitor C1 is 3V. The first output pin 10212 outputs 0V voltage, and the voltage output by the second output pin 10213 is the output voltage 3V of the power supply AVDD connected to the first switch K1. As shown in Figure 10(b), when the first drive signal is the second level, the first switch K1 is closed, and the second switch K2 is open. When the level is low, the first switch K1 and the second switch K2 are open, and the sixth switch K6 is closed. The power supply AVDD connected to the sixth switch K6 and the first capacitor C1 together output a voltage of 6V, which is twice the power supply AVDD, to the second output pin 10213. The power supply AVDD connected to the sixth switch K6 outputs a voltage of 3V, which is once the power supply AVDD, to the first output pin 10212. The voltage difference of 3V between the first output pin 10212 and the second output pin 10213 powers the touch chip 101. Since the first drive signal is a square wave signal that alternates between high and low levels, the first output pin 10212 outputs a second drive signal of 0V-3V.

[0108] Figure 11 is a schematic diagram of another example of a level conversion unit provided in an embodiment of this application. As shown in Figure 11, when N=3, there are a first sub-circuit, a second sub-circuit, and a third sub-circuit. As shown in Figure 11(a), when the first drive signal is at the first level, the first switch K1, the second switch K2, the third switch K3, and the fifth switch K5 are closed, and the fourth switch K4 and the sixth switch K6 are open. At this time, the power supply AVDD charges the first capacitor C1 and the second capacitor C2. The charging voltage of the first capacitor C1 and the second capacitor C2 is 3V. The first output pin 10212 outputs a voltage of 0V, and the voltage output by the second output pin 10213 is the output voltage of the power supply AVDD connected to the first switch K1, which is 3V. As shown in Figure 11(b), when the first drive signal is at the second level, the first switch K1 is at the first level. When the level is low, the first switch K1, the second switch K2, the third switch K3, and the fifth switch K5 are open, and the fourth switch K4 and the sixth switch K6 are closed. The power supply AVDD connected to the sixth switch K6, together with the first capacitor C1 and the second capacitor C2, outputs a voltage of 9V, which is 3 times the output voltage of the power supply AVDD. The power supply AVDD connected to the sixth switch K6 and the second capacitor C2 together output a voltage of 6V, which is 2 times the output voltage of the power supply AVDD, to the first output pin 10212. The voltage difference of 3V between the first output pin 10212 and the second output pin 10213 powers the touch chip 101. Since the first drive signal is a square wave signal that alternates between high and low levels, the first output pin 10212 outputs a second drive signal of 0V-6V at this time.

[0109] Figure 12 is a schematic diagram of an output voltage timing provided in an embodiment of this application. As shown in Figure 12, when the first drive signal is low, the second output pin 10213 outputs AVDD output voltage, and the first output pin 10212 outputs 0V voltage. When the first drive signal is high, the second output pin 10213 outputs N times the AVDD output voltage, and the first output pin 10212 outputs N-1 times the AVDD output voltage, where N is the number of sub-circuits.

[0110] In this embodiment, the first output pin 10212 of the level conversion unit 102 outputs a second driving signal by controlling the on / off state of the switches in the N sub-circuits, and the second output pin 10213 outputs a power supply voltage AVDD with a constant voltage difference from the output voltage of the first output pin 10212. This realizes the generation of the second driving signal and the constant voltage power supply to the touch chip 101. Thus, the second driving signal can be transmitted in a closed loop, and the touch chip 101 can perform touch position recognition on the first sensing signal.

[0111] Figure 13 is a circuit diagram of another level conversion unit provided in an embodiment of this application. As shown in Figure 13, the level conversion unit 102 includes: a seventh switch K7, an eighth switch K8, a ninth switch K9, a third capacitor C3, and a DC / DC converter. The first terminal of the seventh switch K7 is connected to the power supply AVDD, and the second terminal of the seventh switch K7 is connected to the second output pin 10213. The first terminal of the third capacitor C3 is connected to the second output pin 10213, and the second terminal of the third capacitor C3 is connected to both the first terminal of the eighth switch K8 and the first output pin 10212. The second terminal of the eighth switch K8 is grounded. The input terminal of the DC / DC converter is connected to the power supply AVDD, and the output terminal of the DC / DC converter is connected to the ninth switch K8. The first terminal of switch K9 is connected, and the second terminal of the ninth switch K9 is connected to the second terminal of the third capacitor C3. The DC / DC converter can boost or buck the output voltage of the power supply AVDD. The level conversion unit 102 is used to control the on / off state of the seventh switch K7, the eighth switch K8, and the ninth switch K9 according to the first drive signal, so that the on / off states of the seventh switch K7 and the eighth switch K8 are the same, and the on / off states of the seventh switch K7 and the ninth switch K9 are opposite. When the seventh switch K7 is closed, a low level of the second drive signal is generated on the first output pin 10212. When the ninth switch K9 is closed, a high level of the second drive signal is generated on the first output pin 10212. The output voltage of the power supply AVDD is equal to the power supply voltage of the touch chip 101.

[0112] In one example, as shown in Figure 13(a), when the first drive signal is at the first level, the seventh switch K7 and the eighth switch K8 are closed, and the ninth switch K9 is open. At this time, the third capacitor C3 in the circuit is charged through the power supply AVDD. As shown in Figure 13(b), when the first drive signal is at the second level, the seventh switch K7 and the eighth switch K8 are open, and the ninth switch K9 is closed. The third capacitor C3 and the DC / DC converter jointly output voltage to the first output pin 10212 and the second output pin 10213 of the level conversion unit 102. It should be understood that since the third capacitor C3 is connected in the first output pin 10212 and the second output pin 10213, there is a constant phase difference between the first output pin 10212 and the second output pin 10213, which is the voltage output by the third capacitor C3.

[0113] The following example uses a power supply AVDD outputting 3V voltage, with a DC / DC converter boosting the AVDD output voltage by M times. As shown in Figure 13(a), when the first drive signal is at the first level, switches K7 and K8 are closed, and switch K9 is open. At this time, the power supply AVDD charges the third capacitor C3, and the charging voltage of the third capacitor C3 is 3V. The first output pin 10212 outputs 0V, and the second output pin 10213 outputs the 3V output voltage of the power supply AVDD connected to switch K7, as shown in Figure 13(b). When the first drive signal is at the second level, switches K7 and K8 are open, and switch K9 is closed. The DC / DC converter connected to switch K9 boosts the AVDD output voltage by M times. The third capacitor C3 together outputs an output voltage of 3*(M+1)V, which is M+1 times the power supply AVDD, to the second output pin 10213. The DC / DC converter connected to the ninth switch K9 outputs an output voltage of 3*MV, which is M times the power supply AVDD, to the first output pin 10212. The voltage difference of 3V between the first output pin 10212 and the second output pin 10213 powers the touch chip 101. Since the first drive signal is a square wave signal that alternates between high and low levels, the first output pin 10212 outputs a second drive signal of 0V-3*MV. It should be understood that since the DC / DC converter can boost or buck the power supply AVDD output voltage in a way that is not an integer multiple, M is a natural number greater than or equal to 0.

[0114] It should be understood that the DC / DC converter can be a boost circuit, such as a boost DC / DC circuit, or the DC / DC converter can be a buck circuit, such as a buck DC / DC circuit. The specific circuit can be set as needed. It should also be understood that the scheme of the DC / DC converter stepping down the output voltage of the power supply AVDD is similar in principle to the scheme of the DC / DC converter stepping up the output voltage of the power supply AVDD in the above embodiment, and will not be described again here.

[0115] In this embodiment, the first output pin 10212 of the level conversion unit 102 outputs a second driving signal by controlling the on / off states of the seventh switch K7, the eighth switch K8, and the ninth switch K9. The second output pin 10213 outputs a power supply voltage AVDD with a constant voltage difference from the output voltage of the first output pin 10212, thereby generating the second driving signal and providing constant voltage power to the touch chip 101. This allows the second driving signal to be transmitted in a closed loop, and the touch chip 101 to identify the touch position based on the first sensing signal.

[0116] Figure 14 is a schematic diagram of another level conversion unit provided in the embodiment of this application. As shown in Figure 14, the level conversion unit 102 further includes: a first communication unit 1022. The first end of the first communication unit 1022 is connected to the first communication pin 2011 of the processor 201 of the electronic device, and the second end of the first communication unit 1022 is connected to the second communication pin 10114 of the touch chip 101. The first communication unit 1022 can perform step-up and step-down processing on the communication signal between the touch chip 101 and the processor 201.

[0117] The level conversion unit 102 may include a first communication unit 1022. One end of the first communication unit 1022 can be connected to a first communication pin 2011 of the processor 201 of the electronic device, and the other end of the first communication unit 1022 can be electrically connected to a second communication pin 10114 in the touch chip 101. For example, one end of the first communication unit 1022 is connected to the communication pin of the processor 201, and the other end is electrically connected to the SPI pin of the touch chip 101. The touch chip 101 can communicate with the level conversion unit 102 through the first communication pin 2011 to perform settings and other operations on the level conversion unit 102. The first communication unit 1022 can perform step-up and step-down processing on the communication signals between the touch chip 101 and the processor 201. For example, it can step down the touch position coordinate signal output by the touch chip 101 and then send it to the processor 201 in the electronic device. It should be understood that since the level conversion unit 102 generates the second driving signal and sends it to the ground pin 10112 of the touch chip 101, the reference voltage of the ground pin 10112 of the touch chip 101 is not 0V of the ground line, but the second driving signal. When the second driving signal is at a high level, the touch chip 101 operates based on the reference voltage of the ground pin 10112. The voltage of the communication signal generated by the touch chip 101 is relatively high. For example, when the ground pin 10112 of the touch chip 101 is 0V, the touch position coordinate signal output by the touch chip 101 is 3V; when the ground pin 10112 of the touch chip 101 is 10V, the touch position coordinate signal output by the touch chip 101 is 13V, and so on. At this time, the first communication unit 1022 can reduce the voltage of the communication signal sent by the touch chip 101 before sending it to the processor 201. For example, it can step down the 13V communication signal to a 3V communication signal to prevent the processor 201 from being damaged by high voltage, or it can boost the communication signal sent by the processor 201. After processing, the signal is sent to the touch chip 101. The principle is the same as above. When the reference voltage of the ground pin 10112 of the touch chip 101 is not 0V of the ground line, but the second drive signal, if the processor 201 sends a communication signal, when the reference voltage of the ground pin 10112 of the touch chip 101 is high, for example, 13V as mentioned above, the communication signal sent by the processor 201 (generally 1.8V-3V) is negative relative to the reference voltage of the ground pin 10112, and cannot communicate normally. The communication signal sent by the processor 201 can be boosted and sent to the touch chip 101 through the first communication unit 1022.

[0118] In one example, the first communication unit 1022 may be a level shifter circuit set in the level conversion unit, and the specific circuit structure is not limited in the embodiments of this application.

[0119] In this embodiment, the level conversion unit further includes a first communication unit 1022. The first end of the first communication unit 1022 is connected to the first communication pin 2011 of the processor 201, and the second end of the first communication unit 1022 is connected to the second communication pin 10114 of the touch chip 101. The first communication unit 1022 can perform boost / buck processing on the communication signal between the touch chip 101 and the processor 201 to prevent the touch chip 101 and the processor 201 from being unable to communicate normally because the reference voltage of the ground pin of the touch chip 101 is the second driving signal. It can also prevent the processor 201 from being damaged by high voltage and improve reliability.

[0120] Figure 15 is a schematic diagram of a touch device including a communication unit according to an embodiment of this application. As shown in Figure 15, the touch device further includes a second communication unit 103 and a plurality of third communication units 104. The first end of the second communication unit 103 is connected to the chip select signal output pin 2012 of the processor 201 of the electronic device, and the second end of the second communication unit 103 is connected to the chip select signal receiving pin 10115 of the touch chip 101. The first end of the third communication unit 104 is connected to the third communication pin 2013 of the processor 201. The second communication unit 103 is connected to the fourth communication pin 10116 of the touch chip 101. The processor 201 includes multiple third communication pins 2013 and the touch chip 101 includes multiple fourth communication pins 10116. Different third communication units 104 are connected to different third communication pins 2013 and fourth communication pins 10116 respectively. The second communication unit 103 is used to receive the chip select signal output by the processor 201 and send the chip select signal to the touch chip 101. The third communication unit 104 is used to transmit data between the processor 201 and the touch chip 101.

[0121] The touch device may also include a second communication unit 103 and multiple third communication units 104 (only three are shown in Figure 15). The second communication unit 103 can receive the chip select signal output by the processor 201 and send the chip select signal to the touch chip 101 to switch the touch mode. In one example, the chip select signal can be the CS2 signal. Different third communication units 104 are connected to different third communication pins 2013 and fourth communication pins 10116. The third communication pins 2013 can be CLK, MOSI, and MISO pins, and the corresponding fourth pins can be FCLK, FMOSI, and FMISO pins. Clock signals can be transmitted through the third communication unit 104 connected between the CLK pin and the FCLK pin. Communication data between the processor 201 and the touch chip 101 can be transmitted through the third communication unit 104 connected between the MOSI pin and the FMOSI pin, and / or through the third communication unit 104 connected between the MISO pin and the FMISO pin.

[0122] In this embodiment of the application, the touch device further includes a second communication unit 103 and a plurality of third communication units 104. The processor 201 can transmit a chip select signal to the touch chip 101 through the second communication unit 103 to enable the touch chip 101 to switch the touch mode. The processor 201 and the touch chip 101 can transmit communication data through the plurality of third communication units 104, thereby enabling communication between the processor 201 and the touch chip 101.

[0123] Figure 16 is a schematic diagram of a second communication unit and a third communication unit provided in an embodiment of this application. As shown in Figure 16, the second communication unit 103 includes a first enhancement-mode NMOS transistor N1, a first resistor R1 and a second resistor R2; the third communication unit 104 includes a second enhancement-mode NMOS transistor N2, a third resistor R3 and a fourth resistor R4.

[0124] The first end of the first resistor R1 is connected to the chip select signal output pin 2012, and the second end of the first resistor R1 is connected to the voltage output pin of the processor 201. The source of the first enhancement-mode NMOS transistor N1 is connected to the chip select signal output pin 2012 and the first end of the first resistor R1, respectively. The gate of the first enhancement-mode NMOS transistor N1 is connected to the voltage output pin and the second end of the first resistor R1, respectively. The drain of the first enhancement-mode NMOS transistor N1 is connected to the first end of the second resistor R2 and the chip select signal receiving pin 10115, respectively. The second end of the second resistor R2 is connected to the second output pin 10213.

[0125] The first end of the third resistor R3 is connected to the third communication pin 2013, and the second end of the third resistor R3 is connected to the voltage output pin. The source of the second enhancement-mode NMOS transistor N2 is connected to the third communication pin 2013 and the first end of the third resistor R3, respectively. The gate of the second enhancement-mode NMOS transistor N2 is connected to the chip select signal output pin 2012. The drain of the second enhancement-mode NMOS transistor N2 is connected to the first end of the fourth resistor R4 and the fourth communication pin 10116, respectively. The second end of the fourth resistor R4 is connected to the second output pin 10213.

[0126] The second communication unit 103 and the third communication unit 104 in this embodiment can prevent the processor 201 from burning out when the reference voltage of the ground line of the touch chip 101 is the second driving signal and the high-level signal is transmitted to the processor 201. They can also realize communication between the processor 201 and the touch chip 101. An example is given below.

[0127] As shown in Figure 16, the second communication unit 103 of the processor 201 outputs a 1.8V voltage at its voltage output pin, which is a high-level signal. When the chip select signal output pin 2012 outputs a low-level signal, the first enhancement-mode NMOS transistor N1 receives a 1.8V voltage at its gate and a low-level signal at its source, thus turning on the first enhancement-mode NMOS transistor N1. The first enhancement-mode NMOS transistor N1 outputs the low-level signal received at its source to the chip select signal receiving pin 10115 through its drain. When the chip select signal output pin 2012 outputs a high-level signal, the... The gate of the first enhancement-mode NMOS transistor N1 receives a voltage of 1.8V, and both the source and gate receive a high level. Therefore, the first enhancement-mode NMOS transistor N1 is turned off, and the chip select signal receiving pin 10115 outputs the voltage of the second resistor R2, that is, the power supply voltage output by the second output pin 10213. It should be understood that when the power supply voltage is output, since the difference between the power supply voltage output by the second output pin 10213 and the second drive signal received by the ground line of the touch chip 101 is the power supply voltage of the touch chip 101, it will not cause damage to the touch chip 101. Conversely, when the chip select signal receiving pin 10115 outputs a low-level signal to the second communication unit 103, due to the presence of a parasitic diode in the first enhancement-mode NMOS transistor N1, charge is transferred to the drain through the parasitic diode. At this time, the source voltage of the first enhancement-mode NMOS transistor N1 is pulled low, and the gate of the first enhancement-mode NMOS transistor N1 receives a high-level signal, turning on the first enhancement-mode NMOS transistor N1. This causes the source of the first enhancement-mode NMOS transistor N1 to output a low-level signal to the chip select signal output pin 2012. When the chip select signal receiving pin 10115 outputs a high-level signal to the second communication unit 103, the parasitic diode does not conduct, and the source voltage is determined by the voltage of the first resistor R1. At this time, both the source and gate of the first enhancement-mode NMOS transistor N1 receive high-level signals, turning off the first enhancement-mode NMOS transistor N1. The source voltage is the output voltage of the voltage output pin of the processor 201, which is a high-level signal (1.8V) and will not burn out the processor 201.

[0128] As shown in Figure 16, the third communication unit 104 of the processor 201 outputs a voltage of 1.8V on its voltage output pin, which is a high-level signal. When the chip select signal output pin 2012 outputs a low-level signal, the second enhancement-mode NMOS transistor N2 is turned off because its gate receives a low-level signal. Therefore, the signal output from the fourth communication pin 10116 cannot be transmitted to the processor 201. This prevents the output of a higher-voltage communication signal to the processor 201 when the reference voltage of the ground pin of the touch chip 101 is the second drive signal. When the chip select signal output pin 2012 outputs a high-level signal (1.8V), the principle is similar to that of the second communication unit 103 described above, and will not be repeated here.

[0129] In this embodiment, the second communication unit 103 includes a first enhanced NMOS transistor N1, a first resistor R1, and a second resistor R2; the third communication unit 104 includes a second enhanced NMOS transistor N2, a third resistor R3, and a fourth resistor R4. Communication between the processor 201 and the touch chip 101 can be achieved through the first enhanced NMOS transistor N1 and the second enhanced NMOS transistor N2. The circuit structures of the second communication unit 103 and the third communication unit 104 can prevent the touch chip 101 from outputting a high-voltage signal to the processor 201. This prevents the touch chip 101 from outputting a high-voltage signal to the processor 201 when the reference voltage of the ground pin is the second driving signal, thus preventing the processor 201 from being damaged by high voltage. Compared with the first communication unit scheme in the aforementioned embodiment, since the communication data does not need to undergo active buck-boost processing, the communication efficiency can be improved and the signal transmission delay can be reduced.

[0130] Figure 17 is a schematic diagram of a touch chip provided in an embodiment of this application. As shown in Figure 17, the touch chip 101 includes a current conversion unit 1012 and a processing unit 1013. The current conversion unit 1012 can generate an identification signal based on a first sensing signal and / or a second sensing signal. The processing unit 1013 can identify the touch position based on the identification signal.

[0131] In this embodiment of the application, the touch chip 101 includes a current conversion unit 1012 and a processing unit 1013. The current conversion unit 1012 can receive a first sensing signal and / or a second sensing signal and convert the first sensing signal and / or the second sensing signal into an identification signal. The processing unit 1013 can identify the touch position based on the identification signal, thereby realizing the identification of the touch position.

[0132] Figure 18 is a circuit diagram of a current conversion unit provided in an embodiment of this application. As shown in Figure 18, the current conversion unit includes a transimpedance amplifier D1, a fifth resistor R5, a sixth resistor R6, a first feedback resistor Rf1, a second feedback resistor Rf2, a fourth capacitor C4, a fifth capacitor C5, and an analog-to-digital converter 10121. The first end of the fifth resistor R5 is connected to an electrode, and the second end of the fifth resistor R5 is connected to the positive input terminal of the transimpedance amplifier D1. The first end of the sixth resistor R6 is connected to the reference voltage VCMI, and the second end of the sixth resistor R6 is connected to the negative input terminal of the transimpedance amplifier D1. The negative output terminal of the transimpedance amplifier D1 is connected to the first input terminal of the analog-to-digital converter 10121, and the positive output terminal of the transimpedance amplifier D1 is connected to the second input terminal of the analog-to-digital converter 10121. The first end of the first feedback resistor Rf1 is connected to the transimpedance amplifier D1, a fifth resistor R5, a sixth resistor R6, a first feedback resistor Rf1, a second feedback resistor Rf2, a fourth capacitor C4, a fifth capacitor C5, and an analog-to-digital converter 10121. The positive input terminal of the transimpedance amplifier D1 is connected to the first feedback resistor Rf1, the second terminal of the first feedback resistor Rf1 is connected to the negative output terminal of the transimpedance amplifier D1, the first terminal of the second feedback resistor Rf2 is connected to the negative input terminal of the transimpedance amplifier D1, the second terminal of the second feedback resistor Rf2 is connected to the positive output terminal of the transimpedance amplifier D1, the first terminal of the fourth capacitor C4 is connected to the first terminal of the first feedback resistor Rf1, the second terminal of the fourth capacitor C4 is connected to the second terminal of the first feedback resistor Rf1, the first terminal of the fifth capacitor C5 is connected to the first terminal of the second feedback resistor Rf2, and the second terminal of the fifth capacitor C5 is connected to the second terminal of the second feedback resistor Rf2. The transimpedance amplifier D1 can convert the first induction signal and / or the second induction signal into an identification voltage. The analog-to-digital converter 10121 can receive the identification voltage and convert the identification voltage into an identification signal.

[0133] In one example, the first and second sensing signals are current signals. The identified current can be converted into a square wave signal through the feedback resistor, capacitor and transimpedance amplifier D1. Specifically, the identified current is applied to the feedback resistor. The transimpedance amplifier D1 identifies the voltage across the feedback resistor and compares it with the reference voltage VCMI to generate a square wave signal. The square wave signal output by the transimpedance amplifier D1 can be converted into a digital signal through the analog-to-digital converter 10121.

[0134] In this embodiment, the transimpedance amplifier D1 can amplify the identification current, converting the first sensing signal and / or the second sensing signal into an identification voltage. The analog-to-digital converter 10121 can convert the identification voltage into a digital signal, thereby converting the identification current into an identification signal. This allows the processor to identify touch commands based on the identification signal, thus achieving touch position recognition.

[0135] Figure 19 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 19, the current conversion unit 1012 further includes a low-pass filter 10122. The first input terminal of the low-pass filter 10122 is connected to the negative output terminal of the transimpedance amplifier D1, the second input terminal of the low-pass filter 10122 is connected to the positive output terminal of the transimpedance amplifier D1, the first output terminal of the low-pass filter 10122 is connected to the first input terminal of the analog-to-digital converter 10121, and the second output terminal of the low-pass filter 10122 is connected to the second input terminal of the analog-to-digital converter 10121. The low-pass filter 10122 can perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

[0136] In this embodiment, the current conversion unit 1012 further includes a low-pass filter 10122, which can perform low-pass filtering on the recognition voltage to reduce external signal interference in the recognition voltage, such as filtering out out-of-band signal interference or signal noise. At the same time, it can also prevent the Nyquist aliasing effect, improve the signal-to-noise ratio of the recognition voltage input to the analog-to-digital converter 10121, and reduce the recognition signal corresponding to external signal interference in the recognition signal converted by the analog-to-digital converter 10121, thereby reducing the impact of external signal interference on touch recognition and improving the accuracy of touch recognition.

[0137] Figure 20 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 20, the current conversion unit 1012 further includes a sample-and-hold module 10123. The sample-and-hold module 10123 includes a tenth switch K10, an eleventh switch K11, a twelfth switch K12, a thirteenth switch K13, a sixth capacitor C6, and a seventh capacitor C7. The first terminal of the tenth switch K10 is connected to the first output terminal of the low-pass filter 10122, and the second terminal of the tenth switch K10 is simultaneously connected to the first terminal of the sixth capacitor C6 and the first terminal of the eleventh switch K11. The eleventh switch K11 is connected to the first input terminal of the analog-to-digital converter 10121, the second terminal of the sixth capacitor C6 is grounded, the first terminal of the twelfth switch K12 is connected to the second output terminal of the low-pass filter 10122, the second terminal of the twelfth switch K12 is connected to the first terminal of the seventh capacitor C7 and the first terminal of the thirteenth switch K13, the second terminal of the thirteenth switch K13 is connected to the second input terminal of the analog-to-digital converter 10121, the second terminal of the seventh capacitor C7 is grounded, and the sample-and-hold module 10123 can maintain the identification voltage.

[0138] Since both the first and second inductive signals are changing signals, the identification voltage output by the transimpedance amplifier D1, i.e., the square wave signal, is also a changing square wave signal. To ensure that all input signals are converted into identification signals by the analog-to-digital converter 10121, a sample-and-hold circuit is provided. This circuit can temporarily store subsequent identification voltages during the digital-to-analog conversion by the analog-to-digital converter 10121, preventing the converter from missing some identification voltage due to changes in the identification voltage. Specifically, during the digital-to-analog conversion by the analog-to-digital converter 10121, the first and second inductive signals are stored. When switch eleven K11 and / or switch thirteen K13 are open, the identification voltage is temporarily stored through capacitors six C6 and seven C7. When the analog-to-digital converter 10121 is idle, switch ten K10 and / or switch twelfth K12 are opened, and switch eleven K11 and / or switch thirteenth K13 are closed, so that the analog-to-digital converter 10121 receives the identification voltage temporarily stored in the capacitors. The sampling and holding effect is achieved through switch ten K10, switch eleven K11, switch twelfth K12, switch thirteenth K13, capacitor six C6, and capacitor seven C7.

[0139] In this embodiment, the current conversion unit 1012 further includes a sample-and-hold module 10123. The sample-and-hold module 10123 can sample and hold the recognition voltage output by the transimpedance amplifier D1 through the tenth switch K10, the eleventh switch K11, the twelfth switch K12, the thirteenth switch K13, the sixth capacitor C6, and the seventh capacitor C7. This can prevent the recognition voltage from changing due to changes in the first sensing signal and / or the second sensing signal, thus avoiding the analog-to-digital converter 10121 from missing part of the recognition voltage. It can ensure that the analog-to-digital converter 10121 converts all the recognition voltages into recognition signals, thereby improving the accuracy of touch recognition.

[0140] Figure 21 is a circuit diagram of another current conversion unit provided in an embodiment of this application. As shown in Figure 21, the current conversion unit 1012 further includes: a buffer amplifier 10124. The first input terminal of the buffer amplifier 10124 is connected to the second terminal of the eleventh switch K11, the second input terminal of the buffer amplifier 10124 is connected to the second terminal of the thirteenth switch K13, the first output terminal of the buffer amplifier 10124 is connected to the first input terminal of the analog-to-digital converter 10121, and the second output terminal of the buffer amplifier 10124 is connected to the second input terminal of the analog-to-digital converter 10121. The buffer amplifier 10124 can perform signal amplification processing on the identified voltage.

[0141] In this embodiment, the current conversion unit 1012 further includes a buffer amplifier 10124. The buffer amplifier 10124 can amplify the recognition voltage signal. The buffer amplifier 10124 can be a level converter or buffer, etc. Specifically, it can increase the high level and decrease the low level in the recognition voltage to amplify the signal amplitude. This can make the recognition voltage signal amplitude of the input analog-to-digital converter 10121 larger, avoiding the inability of the analog-to-digital converter 10121 to convert the recognition voltage into a recognition signal due to the small recognition voltage, thus preventing the inability to recognize the touch and improving the accuracy of touch recognition.

[0142] In one possible implementation, the touch chip also includes a demodulation circuit that can demodulate the recognition signal to obtain a demodulated signal and send the demodulated signal to the processing unit so that the processing unit can identify the touch position based on the demodulated signal.

[0143] The demodulation circuit demodulates the identification signal sent by the analog-to-digital converter. Specifically, it demodulates the identification signal to determine the signal amplitude of the identification signal or a second identification signal, and generates a demodulated signal based on the signal amplitude of the identification signal. In one example, the demodulation circuit can perform narrowband demodulation on the identification signal to reduce the bandwidth of noise, thereby improving the signal-to-noise ratio of the identification signal. After generating the demodulated signal, the demodulation circuit sends it to the processing unit in the touch chip. The processing unit can then perform touch position recognition based on the demodulated signal. In one example, the demodulation circuit can be a digital demodulation circuit; in another example, it can be an analog demodulation circuit.

[0144] In this embodiment of the application, the touch chip includes a demodulation circuit, which can demodulate the recognition signal to obtain a demodulated signal. Touch position recognition can then be performed based on the demodulated signal. Since a demodulation circuit is provided, noise in the recognition signal can be reduced, resulting in a higher signal-to-noise ratio for the demodulated signal, which can improve the accuracy of touch position recognition.

[0145] Figure 22 is a schematic diagram of a demodulation circuit provided in an embodiment of this application. As shown in Figure 22, the demodulation circuit 105 includes a first demodulation branch 1051 and a second demodulation branch 1052. The first demodulation branch 1051 is used to perform sine demodulation on the identification signal to obtain a first demodulation sub-signal. The second demodulation branch 1052 is used to perform cosine demodulation on the identification signal to obtain a second demodulation sub-signal. The demodulation circuit 105 is used to generate a demodulation signal based on the first demodulation sub-signal and the second demodulation sub-signal.

[0146] The demodulation circuit 105 can be a logic circuit. The demodulation circuit 105 includes two branches. The first demodulation branch 1051 can perform sinusoidal demodulation on the identification signal to obtain the I component (first demodulation sub-signal) of the identification signal. The second demodulation branch 1052 can perform cosine demodulation on the identification signal to obtain the Q component (second demodulation sub-signal) of the identification signal. The signal amplitude of the demodulated signal can be obtained by calculating the root mean square of the square of the I component and the square of the Q component.

[0147] In one example, Figure 23 is a schematic diagram of an IQ demodulation principle provided by an embodiment of this application. As shown in Figure 23, the I component of the identified signal is equal to... The Q component of the identified signal is equal to: Find the roots of I3 and Q3, then A represents the amplitude of the identified signal, β represents the phase information of the identified signal, β = arctan(I² / Q²), and T represents the driving time of the driving signal. The demodulation circuit 105 uses IQ narrowband demodulation. Taking a coding time of 100ms as an example, the noise band width is ±10Hz. In one example, a digital window function operation, such as a Hamming window or a Hanning window, can be added between the analog-to-digital converter 10121 and the demodulation circuit 105 to avoid signal loss due to truncation effect.

[0148] In this embodiment, the demodulation circuit 105 includes a first demodulation branch 1051 and a second demodulation branch 1052, which can perform IQ demodulation on the identification signal. Since IQ demodulation is used on the identification signal, the noise of the touch chip in touch position recognition can be reduced. Furthermore, since the bandwidth of IQ narrowband demodulation is extremely narrow, the in-band noise of the generated demodulated signal can be reduced, the signal-to-noise ratio of the demodulated signal can be improved, and the accuracy of touch position recognition can be improved.

[0149] This application embodiment also provides a touch chip, which is used to send a first driving signal when in a first touch mode. The first driving signal is used to generate a second driving signal and forms a closed loop with the finger and the electrodes on the touch screen when touched by a finger. Touch position recognition is performed based on the first sensing signal generated in the closed loop.

[0150] In this application embodiment, the touch chip can be the touch chip 101 in any of the above embodiments, which can perform the operations in any of the above embodiments and can be the structure in any of the above embodiments, and will not be described again here.

[0151] Figure 24 is a schematic diagram of a display screen module provided in an embodiment of this application. As shown in Figure 24, the display screen module 400 includes the touch device 100 and electrode 401 in any of the above embodiments. The electrode 401 is used to form a closed loop with the touch chip 101 and the finger when touched by a finger. The electrode 401 includes horizontal electrodes and / or vertical electrodes arranged on the touch screen.

[0152] In this application embodiment, the touch device can be the touch device 100 in any of the above embodiments, the electrode can be the electrode 401 in any of the above embodiments, and it can perform the operation in any of the above embodiments and can be the structure in any of the above embodiments, which will not be described again here.

[0153] Figure 25 is a schematic diagram of an electronic device provided in an embodiment of this application. As shown in Figure 25, the electronic device 200 includes a processor 201 and a display screen module 400 in the above embodiment.

[0154] In one example, Figure 26 is a schematic diagram of the switching principle of an electronic device provided in an embodiment of this application. As shown in Figure 26, when the electronic device is in the first touch mode, it can output a first driving signal to the level conversion unit through the touch chip. When the electronic device is in the second touch mode, it can output a third driving signal to the electrodes in the screen module through the touch chip. When the electronic device is in the third touch mode, it can output the first driving signal to the level conversion unit and the third driving signal to the electrodes in the screen module through the touch chip. In one example, the electronic device can switch between touch modes by sending a first switching signal, a second switching signal and a third switching signal to the touch chip in the touch device through the processor.

[0155] In this application embodiment, the processor can be the processor 201 in any of the above embodiments, which can execute the operations in any of the above embodiments and can be the structure in any of the above embodiments, and will not be described again here.

[0156] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the method embodiments, since they are basically similar to the methods described in the apparatus and system embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions of other embodiments.

[0157] It should be understood that the foregoing describes specific embodiments of this specification. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0158] It should be understood that the use of a singular form to describe an element or to show only one element in the accompanying drawings does not imply that the number of such element is limited to one. Furthermore, modules or elements described or shown as separate herein may be combined into a single module or element, and modules or elements described or shown as single herein may be broken down into multiple modules or elements.

[0159] It should also be understood that the terminology and expressions used herein are for descriptive purposes only, and one or more embodiments described herein should not be limited to these terms and expressions. The use of these terms and expressions does not exclude any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

Claims

1. A touch device configured to be disposed in an electronic device, comprising: The touch control device comprises: a touch chip; the touch chip is configured to send a first driving signal when in a first touch control mode; the first driving signal is used to generate a second driving signal, when a finger touches, a closed loop is formed by the touch chip, the finger and electrodes on a touch screen, the second driving signal is transmitted in the closed loop, a first induction signal is generated in the closed loop, and the touch chip performs touch position recognition according to the first induction signal. 2.The touch device of claim 1, wherein, The touch control device further comprises a level conversion unit; the level conversion unit is configured to receive the first driving signal, generate a second driving signal according to the first driving signal, and send the second driving signal to the touch chip.

3. The touch control device according to claim 2, wherein the touch chip is configured to, when in a second touch control mode, stop sending the first driving signal to the level conversion unit, send a third driving signal to the electrodes, and perform touch position recognition according to a second induction signal output by the electrodes, wherein the electrodes comprise a plurality of horizontal electrodes and / or a plurality of vertical electrodes.

4. The touch control device according to claim 3, wherein the touch chip is configured to, when in a third touch control mode, send the first driving signal to the level conversion unit, and send the third driving signal to the electrodes, and perform touch position recognition according to the first induction signal and the second induction signal when a finger touches.

5. The touch control device according to claim 3, wherein the touch chip is configured to alternately output the first driving signal and the third driving signal in a time sequence, and switch to the first touch control mode when the second induction signal is less than a first signal threshold, and switch to the second touch control mode when the second induction signal is greater than a second signal threshold.

6. The touch control device according to claim 4, wherein the touch chip is configured to switch to the first touch control mode when receiving a first control signal sent by the electronic device, switch to the second touch control mode when receiving a second control signal sent by the electronic device, and switch to the third touch control mode when receiving a third control signal sent by the electronic device.

7. The touch device according to any one of claims 3-6, characterized in that, The touch chip outputs the third driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and receives the second induction signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes, or at least one of the plurality of horizontal electrodes and the plurality of vertical electrodes functions as both a driving electrode and a receiving electrode, the touch chip sends the second driving signal to the driving electrode, and receives the second induction signal output by the receiving electrode.

8. The touch control device according to claim 2, wherein an input pin of the level conversion unit is electrically connected to a first pin of the touch chip, and a first output pin of the level conversion unit is electrically connected to a ground pin of the touch chip. The touch chip sends the first driving signal to the level conversion unit through the first pin, and the level conversion unit sends the second driving signal to the ground pin through the first output pin; When the finger touches, the finger forms a closed loop with the electrode and the ground pin, so that the closed loop generates the first induction signal.

9. The touch control device according to claim 8, wherein, The second output pin of the level conversion unit is connected with the power supply pin of the touch chip; The level conversion unit is used for transmitting a power supply voltage to the touch chip through the power supply pin, and a voltage difference between the power supply voltage and the second driving signal is equal to a power supply voltage of the touch chip. 10.The touch device of claim 9, wherein, The level conversion unit comprises N sub-circuits, and N is an integer greater than or equal to 2; The first sub-circuit in the N sub-circuits comprises a first switch, a second switch and a first capacitor, a first end of the first switch is connected with a power supply, a second end of the first switch is connected with the second output pin, a first end of the first capacitor is connected with the second output pin, a second end of the first capacitor is connected with a first end of the second switch and the first output pin respectively, and a second end of the second switch is grounded; The i-th sub-circuit in the N sub-circuits comprises a third switch, a fourth switch, a fifth switch and a second capacitor, a first end of the third switch is connected with the power supply, a second end of the third switch is connected with a first end of the fourth switch, a second end of the fourth switch is connected with a second end of a capacitor in the i-1-th sub-circuit, a first end of the second capacitor is connected with the second end of the third switch, a second end of the second capacitor is connected with a first end of the fifth switch, and a second end of the fifth switch is grounded, wherein i is an integer greater than 1 and less than N; The N-th sub-circuit in the N sub-circuits comprises a sixth switch, a first end of the sixth switch is connected with the power supply, and a second end of the sixth switch is connected with a second end of a capacitor in the N-1-th sub-circuit; The level conversion unit is used for controlling on-off states of the switches in the N sub-circuits according to the first driving signal, so that on-off states of the first switch, the second switch, the third switch and the fifth switch are the same, on-off states of the fourth switch and the sixth switch are the same, the on-off state of the first switch is opposite to that of the sixth switch, a low level of the second driving signal is generated at the first output pin when the first switch is closed, a high level of the second driving signal is generated at the first output pin when the sixth switch is closed, and an output voltage of the power supply is equal to a power supply voltage of the touch chip.

11. The touch control device according to claim 10, wherein, The level conversion unit comprises a seventh switch, an eighth switch, a ninth switch, a third capacitor and a direct current voltage conversion unit; A first end of the seventh switch is connected with a power supply, a second end of the seventh switch is connected with the second output pin, a first end of the third capacitor is connected with the second output pin, a second end of the third capacitor is connected with a first end of the eighth switch and the first output pin respectively, and a second end of the eighth switch is grounded. An input end of the direct current voltage conversion unit is connected with a power supply, an output end of the direct current voltage conversion unit is connected with a first end of a ninth switch, a second end of the ninth switch is connected with a second end of the third capacitor; The direct current voltage conversion unit is configured to perform voltage boosting or voltage reducing processing on an output voltage of the power supply; The level conversion unit is configured to control on-off states of the seventh switch, the eighth switch and the ninth switch according to the first driving signal, so that the on-off states of the seventh switch and the eighth switch are the same, and the on-off states of the seventh switch and the ninth switch are opposite, a low level of the second driving signal is generated at the first output pin when the seventh switch is closed, a high level of the second driving signal is generated at the first output pin when the ninth switch is closed, and the output voltage of the power supply is equal to a power supply voltage of the touch chip.

12. The touch control device according to claim 2, wherein, The level conversion unit further includes a first communication unit; A first end of the first communication unit is connected with a first communication pin of a processor of the electronic device, and a second end of the first communication unit is connected with a second communication pin of the touch chip; The first communication unit is configured to perform voltage boosting or voltage reducing processing on a communication signal between the touch chip and the processor.

13. The touch control device according to claim 9, wherein, The touch device further includes a second communication unit and a plurality of third communication units; A first end of the second communication unit is connected with a chip select signal output pin of the processor of the electronic device, and a second end of the second communication unit is connected with a chip select signal receiving pin of the touch chip; A first end of the third communication unit is connected with a third communication pin of the processor, and a second end of the third communication unit is connected with a fourth communication pin of the touch chip, the processor includes a plurality of third communication pins, the touch chip includes a plurality of fourth communication pins, and different third communication units are respectively connected with different third communication pins and fourth communication pins; The second communication unit is configured to receive a chip select signal output by the processor and send the chip select signal to the touch chip; The third communication unit is configured to transmit data between the processor and the touch chip.

14. The touch control device according to claim 13, wherein, The second communication unit includes a first enhancement-mode NMOS transistor, a first resistor and a second resistor, and the third communication unit includes a second enhancement-mode NMOS transistor, a third resistor and a fourth resistor; A first end of the first resistor is connected with the chip select signal output pin, a second end of the first resistor is connected with a voltage output pin of the processor, a source of the first enhancement-mode NMOS transistor is connected with the chip select signal output pin and the first end of the first resistor, a gate of the first enhancement-mode NMOS transistor is connected with the voltage output pin and the second end of the first resistor, a drain of the first enhancement-mode NMOS transistor is connected with a first end of the second resistor and the chip select signal receiving pin, and a second end of the second resistor is connected with the second output pin. A first end of the third resistor is connected with the third communication pin, a second end of the third resistor is connected with the voltage output pin, a source of the second enhancement mode NMOS tube is connected with the third communication pin and the first end of the third resistor respectively, a gate of the second enhancement mode NMOS tube is connected with the chip select signal output pin, a drain of the second enhancement mode NMOS tube is connected with the first end of the fourth resistor and the fourth communication pin respectively, and a second end of the fourth resistor is connected with the second output pin.

15. The touch control device according to claim 4, characterized in that, The touch chip comprises a current conversion unit and a processing unit; The current conversion unit is configured to generate an identification signal according to the first sensing signal and / or the second sensing signal; The processing unit is configured to perform touch position identification according to the identification signal. 16.The touch device of claim 15, wherein, The current conversion unit comprises a trans-impedance amplifier, a fifth resistor, a sixth resistor, a first feedback resistor, a second feedback resistor, a fourth capacitor, a fifth capacitor and an analog-to-digital converter. A first end of the fifth resistor is connected with an output end of the electrode, a second end of the fifth resistor is connected with a positive input end of the trans-impedance amplifier, a first end of the sixth resistor is connected with a reference voltage, a second end of the sixth resistor is connected with a negative input end of the trans-impedance amplifier, a negative output end of the trans-impedance amplifier is connected with a first input end of the analog-to-digital converter, and a positive output end of the trans-impedance amplifier is connected with a second input end of the analog-to-digital converter. A first end of the first feedback resistor is connected with the positive input end of the trans-impedance amplifier, a second end of the first feedback resistor is connected with the negative output end of the trans-impedance amplifier, a first end of the second feedback resistor is connected with the negative input end of the trans-impedance amplifier, and a second end of the first feedback resistor is connected with the positive output end of the trans-impedance amplifier. A first end of the fourth capacitor is connected with the first end of the first feedback resistor, a second end of the fourth capacitor is connected with the second end of the first feedback resistor, a first end of the fifth capacitor is connected with the first end of the second feedback resistor, and a second end of the fifth capacitor is connected with the second end of the second feedback resistor. The trans-impedance amplifier is configured to convert the first sensing signal and / or the second sensing signal into an identification voltage. The analog-to-digital converter is configured to receive the identification voltage and convert the identification voltage into the identification signal.

17. The touch control device according to claim 16, wherein, The current conversion unit further comprises a low-pass filter. A first input end of the low-pass filter is connected with the negative output end of the trans-impedance amplifier, a second input end of the low-pass filter is connected with the positive output end of the trans-impedance amplifier, a first output end of the low-pass filter is connected with the first input end of the analog-to-digital converter, and a second output end of the low-pass filter is connected with the second input end of the analog-to-digital converter. The low-pass filter is configured to perform low-pass filtering on the identification voltage to reduce external signal interference in the identification voltage.

18. The touch control device according to claim 17, wherein, The current conversion unit further comprises a sample-and-hold module. The sample holding module comprises a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a sixth capacitor and a seventh capacitor; The first end of the tenth switch is connected with the first output end of the low-pass filter, the second end of the tenth switch is connected with the first end of the sixth capacitor and the first end of the eleventh switch, the second end of the eleventh switch is connected with the first input end of the analog-digital converter, and the second end of the sixth capacitor is grounded. The first end of the twelfth switch is connected with the second output end of the low-pass filter, the second end of the twelfth switch is connected with the first end of the seventh capacitor and the first end of the thirteenth switch, the second end of the thirteenth switch is connected with the second input end of the analog-digital converter, and the second end of the seventh capacitor is grounded. The sample holding module is used for holding the identification voltage.

19. The touch control device according to claim 18, wherein, The current conversion unit further comprises a buffer amplifier; The first input end of the buffer amplifier is connected with the second end of the eleventh switch, the second input end of the buffer amplifier is connected with the second end of the thirteenth switch, the first output end of the buffer amplifier is connected with the first input end of the analog-digital converter, and the second output end of the buffer amplifier is connected with the second input end of the analog-digital converter. The buffer amplifier is used for signal amplification processing of the identification voltage.

20. The touch control device according to any one of claims 15-19, wherein, The touch chip further comprises a demodulation circuit; The demodulation circuit is used for demodulation processing of the identification signal, obtaining a demodulation signal, and sending the demodulation signal to the processing unit, so that the processing unit performs touch position identification according to the demodulation signal.

21. The touch control device according to claim 20, wherein, The demodulation circuit comprises a first demodulation branch and a second demodulation branch; The first demodulation branch is used for sinusoidal demodulation of the identification signal, obtaining a first demodulation sub-signal, and the second demodulation branch is used for cosine demodulation of the identification signal, obtaining a second demodulation sub-signal; The demodulation circuit is used for generating the demodulation signal according to the first demodulation sub-signal and the second demodulation sub-signal. 22.A touch chip, characterized in that, The touch chip is used for sending a first driving signal when in a first touch mode, the first driving signal is used for generating a second driving signal, and forms a closed loop with a finger and an electrode on a touch screen when the finger touches, and touch position identification is performed according to a first induction signal generated in the closed loop.

23. A display screen module, characterized by The electrode and the touch device according to any one of claims 1-21 are comprised. The electrode is used for forming a closed loop with the touch chip and the finger when the finger touches, wherein the electrode comprises transverse electrodes and / or longitudinal electrodes arranged on the touch screen.

24. An electronic device, comprising: The display screen module according to claim 23 is comprised.

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