WO2021097842A1

WO2021097842A1 - Touch apparatus, electronic device, and touch interactive system

Info

Publication number: WO2021097842A1
Application number: PCT/CN2019/120381
Authority: WO
Inventors: 张冠军; 蒋宏
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2021-05-27
Also published as: CN113168259B; CN113168259A

Abstract

A touch apparatus, an electronic device, and a touch interactive system. A touch apparatus (100) comprises a bootstrap circuit (110), an uplink signal generation circuit (120), a synchronous trigger circuit (130) and a touch chip (140). The touch chip (140) is used for generating a first uplink signal of which an amplitude is a first amplitude, the first uplink signal using a potential of a grounding end of the touch chip (140) as a reference potential. The synchronous trigger circuit (130) is used for simultaneously triggering the uplink signal generation circuit (120) to generate a second uplink signal of which an amplitude is a second amplitude and a frequency spectrum and a phase are the same as those of the first uplink signal when the touch chip (140) generates the first uplink signal, and for transmitting the second uplink signal to the grounding end of the touch chip (140), the second uplink signal using a system ground of a host system as a reference potential. The bootstrap circuit (110) is used for stabilizing a voltage between the grounding end of the touch chip (140) and a power supply end of the touch chip (140). The touch apparatus (100) can improve the amplitude of an uplink signal sent by a touch master device to a touch slave device.

Description

Touch control device, electronic equipment and touch control interaction system

Technical field

This application relates to the field of touch control, and more specifically, to a touch control device, an electronic device, and a touch interaction system.

Background technique

At present, in the field of touch device interaction, two-way communication can be realized between the touch master device and the touch slave device through an uplink signal and a downlink signal. The signal sent by the touch master device to the touch slave device is called the uplink signal, and the signal sent by the touch slave device to the touch master device is called the downlink signal. In the main touch control device, an uplink signal is generated by the touch control chip. Due to the limitation of chip design and process, the amplitude of the uplink signal sent by the touch chip is limited, and the sensitivity of the touch slave device to receive the uplink signal and anti-interference characteristics are poor, so how to improve the sensitivity of the touch slave device to receive the uplink signal And anti-interference characteristics is a problem worthy of attention.

Summary of the invention

The embodiments of the present application provide a touch device, an electronic device, and a touch interaction system. The touch control device, electronic equipment and touch interaction system can solve the above-mentioned problems.

The first aspect of the embodiments of the present application provides a touch device. The touch control device is connected with the host system. The touch control device includes a bootstrap circuit, an uplink signal generating circuit, a synchronous trigger circuit and a touch chip. The touch control chip is used to generate a first uplink signal with a first amplitude, and the first uplink signal uses the potential of the ground terminal of the touch control chip as a reference potential. The synchronization trigger circuit is used for when the touch chip generates the first uplink signal, simultaneously triggers the uplink signal generation circuit to generate a second amplitude, and the frequency spectrum and phase are the same as those of the first uplink signal. The second uplink signal is transmitted to the ground terminal of the touch chip, and the second uplink signal uses the system ground of the host system as a reference potential. The bootstrap circuit is used to stabilize the voltage between the ground terminal of the touch chip and the power supply terminal of the touch chip.

It can be seen that the first uplink signal uses the ground terminal of the touch chip as the reference potential, and the second uplink signal uses the system ground of the host system as the reference potential, so as to realize the transmission from the touch master device to the touch slave device. The amplitude of the uplink signal is the sum of the sum of the amplitudes of the first uplink signal and the second uplink signal, thereby achieving the purpose of enhancing the amplitude of the uplink signal, thereby improving the sensitivity and anti-interference ability of the touch slave device to receive the uplink signal.

Optionally, the present application provides an implementation manner of the bootstrap circuit. Please refer to FIG. 2. The bootstrap circuit includes a first switch, a second switch, a third switch, and a first capacitor. One end of the first switch is connected to the power supply voltage source of the host system, and the other end of the first switch is connected to the power supply terminal of the touch chip. One end of the second switch is connected to the upstream signal generating circuit, and the other end of the second switch is connected to the ground terminal of the touch chip. One end of the third switch is connected to the system ground of the host system, and the other end of the third switch is connected to the ground terminal of the touch chip. One end of the first capacitor is connected to the power supply terminal of the touch chip, and the other end of the first capacitor is connected to the ground terminal of the touch chip.

When the touch master device does not send an uplink signal to the touch slave device, the first switch and the third switch are closed, and the second switch is opened. At this time, the voltage between the power supply terminal of the touch chip and the ground terminal of the touch chip Equal to the supply voltage of the host system. At the same time, the host system charges the first capacitor, and the charging voltage is the power supply voltage of the host system. After being charged, the voltage across the first capacitor is equal to the power supply voltage of the host system.

When the touch master device sends an uplink signal to the touch slave device, the first switch and the third switch are opened, and the second switch is closed. At this time, the first capacitor supplies power to the touch chip, and the voltage across the first capacitor is the host The size of the power supply voltage of the system, it can be known that the power supply voltage of the touch chip is equal to the power supply voltage of the host system at this time.

Optionally, in the embodiment of the present application, the touch control device includes a communication circuit. The communication circuit is used to improve the reliability of communication between the touch chip and the host system.

An embodiment of the present application also provides an electronic device, which includes the touch device in the above various embodiments of the present application, and the amplitude of the uplink signal sent by the electronic device is equal to the amplitude of the first uplink signal and the second uplink signal The sum of superposition.

An embodiment of the present application also provides a touch interaction system, including the above-mentioned electronic device and a corresponding touch slave device.

Optionally, in the touch interaction system, the touch slave device may be an active pen.

Optionally, in the touch interaction system, the communication protocol between the electronic device and the touch slave device may be a USI protocol.

Description of the drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. The elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the attached drawings do not constitute a scale limitation.

Fig. 1 is a schematic structural diagram of a touch device according to the present application;

Figure 2 is an implementation of the bootstrap circuit according to the present application;

Fig. 3 is an implementation of the touch interaction system according to the present application.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The first aspect of the embodiments of the present application provides a touch device. The touch control device is connected to the host system and is used to enhance the amplitude of the uplink signal sent by the touch master device to the touch slave device. The host system is a circuit including a main control chip, and its functions include communication with the touch chip and supply voltage for the touch chip. Please refer to FIG. 1, the touch device 100 includes a bootstrap circuit 110, an uplink signal generating circuit 120, a synchronous trigger circuit 130 and a touch chip 140. The touch control chip is used to generate a first uplink signal with a first amplitude, and the first uplink signal uses the potential of the ground terminal of the touch control chip as a reference potential. The synchronization trigger circuit is used for when the touch chip generates the first uplink signal, simultaneously triggers the uplink signal generation circuit to generate a second amplitude, and the frequency spectrum and phase are the same as those of the first uplink signal. The second uplink signal is transmitted to the ground terminal of the touch chip, and the second uplink signal uses the system ground of the host system as a reference potential. The bootstrap circuit is used to stabilize the voltage between the ground terminal of the touch chip and the power supply terminal of the touch chip.

Since the first uplink signal uses the ground terminal of the touch chip as the reference potential, the second uplink signal uses the system ground of the host system as the reference potential, thereby realizing the uplink signal sent from the touch master device to the touch slave device. The amplitude is the sum of the amplitudes of the first uplink signal and the second uplink signal, so as to achieve the purpose of enhancing the amplitude of the uplink signal.

When the touch master device sends an upstream signal, since the ground terminal of the touch chip is connected to the upstream signal generating circuit, the potential difference between the ground terminal of the touch chip and the system ground of the host system is changed, and bootstrap is required The circuit stabilizes the voltage between the ground terminal of the touch chip and the power supply terminal of the touch chip.

In the first embodiment of the present application, a specific implementation of the bootstrap circuit is introduced. Please refer to FIG. 2, the bootstrap circuit 10 includes a first switch 101, a second switch 102, a third switch 103 and a first capacitor 104. One end of the first switch is connected to the power supply voltage source of the host system, and the other end of the first switch is connected to the power supply terminal of the touch chip. One end of the second switch is connected to the upstream signal generating circuit, and the other end of the second switch is connected to the ground terminal of the touch chip. One end of the third switch is connected to the system ground of the host system, and the other end of the third switch is connected to the ground terminal of the touch chip. One end of the first capacitor is connected to the power supply terminal of the touch chip, and the other end of the first capacitor is connected to the ground terminal of the touch chip.

The communication between the touch master device and the touch slave device is divided into two stages. The first stage is that the touch master device does not send an uplink signal to the touch slave device, and the second stage is that the touch master device sends an uplink signal to the touch slave device. Signal, the two stages are executed alternately.

When in the first stage, the touch master device does not send an uplink signal to the touch slave device, the first switch and the third switch are closed, and the second switch is opened. At this time, the power supply voltage source (AVDD) of the host system is directly connected to The power supply terminal of the touch chip, the system ground (GND) of the host system is connected to the ground terminal of the touch chip, and the voltage between the power supply terminal of the touch chip and the ground terminal of the touch chip is equal to the power supply voltage source of the host system ( The voltage between AVDD and the system ground (GND) of the host system, that is, the power supply voltage of the touch chip is equal to the power supply voltage of the host system. At the same time, the power supply voltage of the host system charges the first capacitor, and the charging voltage of the first capacitor is equal to the power supply voltage of the host system.

When in the second stage, the touch master device sends an uplink signal to the touch slave device, and the touch chip generates a first uplink signal. The first switch and the third switch are opened, and the second switch is closed. At this time, the first capacitor supplies power to the touch chip. The voltage stored at both ends of the first capacitor is stored by charging the first capacitor by the supply voltage of the host system during the first stage. Therefore, the voltage across the first capacitor is the supply voltage of the host system. The power supply voltage provided by the capacitor to the touch chip is equal to the power supply voltage of the host system, that is, the power supply voltage of the touch chip in the second stage is equal to the power supply voltage of the host system. From the foregoing, it can be seen that the power supply voltage of the touch chip in the first stage is equal to the power supply voltage of the host system. Therefore, the power supply voltage of the touch chip in the first and second stages is equal to the power supply voltage of the host system. The power supply voltage of the control chip is stable.

When in the second stage, the uplink signal generating circuit is connected to the ground terminal of the touch chip. Therefore, the ground terminal of the touch chip has an unstable potential relative to the system ground (GND) of the host system. The voltage is fixed, so the voltage between the power supply terminal of the touch chip and the ground terminal of the touch chip also remains the same, that is, the power supply voltage of the touch chip remains the same. Therefore, the bootstrap circuit of the embodiment of the present application The example can provide a stable supply voltage for the touch chip.

It should be noted that when in the second stage, when the first capacitor supplies power to the touch chip, a loop will be formed, which will cause the loss of charge, so that the voltage across the first capacitor will drop, but as long as the first capacitor is selected as large For capacitors with high capacity, the voltage across the first capacitor does not drop significantly, so it can also be considered that the voltage remains unchanged.

Optionally, in the embodiment of the present application, the touch control device further includes a communication circuit. The communication circuit is used to improve the communication reliability of the host system and the touch chip. It can be seen from the foregoing that when the touch master device sends an upstream signal to the touch slave device, the upstream signal generating circuit generates a second upstream signal, and the second upstream signal is transmitted to the ground terminal of the touch chip so that the ground of the touch chip is The potential of the terminal is unstable relative to the system ground (GND) of the host system, and the voltage between the power supply terminal of the touch chip and the ground terminal of the touch chip remains unchanged, so the power supply terminal of the touch chip is relative to the system ground of the host system. The potential difference of the system ground (GND) also becomes unstable. It can be seen that when the touch master device sends an uplink signal to the touch slave device, the touch chip and the host system cannot directly communicate, so a communication circuit is required to ensure the normal communication between the host system and the touch chip and improve communication reliability.

Optionally, in the touch interaction system, the touch slave device may be an active pen. Please refer to Figure 3, which is an active pen touch system. The active pen touch system includes a host system 21, a touch device 22, the touch device includes a synchronous trigger circuit 210, a bootstrap circuit 220, an uplink signal generation circuit 230, and a touch chip 240, and the connections between the circuits The relationship is shown in the figure. When the touch master device sends an uplink signal to the active pen, the synchronous trigger circuit simultaneously triggers the uplink signal generating circuit to generate a second uplink signal when the touch chip generates the first uplink signal, and the second uplink signal is transmitted to the touch chip The bootstrap circuit is used to stabilize the voltage of the power supply terminal and the ground terminal of the touch chip. Therefore, the amplitude of the uplink signal sent by the touch master device is equal to the sum of the amplitudes of the first uplink signal and the second uplink signal, and is transmitted to the active pen through the touch screen, which improves the sensitivity and resistance of the active pen to receive the uplink signal. Interference characteristics.

It should be noted that the touch chip described in this application can be used to determine the touch position of a touch object and can send an uplink signal.

It should be noted that, under the premise of no conflict, the various embodiments described in this application and/or the technical features in each embodiment can be combined with each other arbitrarily, and the technical solutions obtained after the combination should also fall within the protection scope of this application. .

It should be understood that the specific examples in the embodiments of the present application are only to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application, and those skilled in the art can base on the above-mentioned embodiments. Various improvements and modifications are made, and these improvements or modifications fall within the scope of protection of the present application.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A touch control device, characterized in that it comprises a bootstrap circuit, an uplink signal generating circuit, a synchronous trigger circuit and a touch chip;

The touch chip is configured to generate a first uplink signal with a first amplitude, and the first uplink signal uses the potential of the ground terminal of the touch chip as a reference potential;

The synchronous trigger circuit is used to trigger the uplink signal generating circuit to generate the second amplitude at the same time when the touch chip generates the first uplink signal, and the frequency spectrum and phase are the same as the first uplink signal And transmitting the second uplink signal to the ground terminal of the touch chip, and the second uplink signal uses the system ground of the host system as a reference potential;

The bootstrap circuit is used to stabilize the voltage between the ground terminal of the touch chip and the power supply terminal of the touch chip.
The touch device of claim 1, wherein the bootstrap circuit comprises a first switch, a second switch, a third switch, and a first capacitor;

One end of the first switch is connected to the power supply voltage source of the host system, and the other end of the first switch is connected to the power supply end of the touch chip;

One end of the second switch is connected to the uplink signal generating circuit, and the other end of the second switch is connected to the ground terminal of the touch chip;

One end of the third switch is connected to the ground terminal of the host system, and the other end of the third switch is connected to the ground terminal of the touch chip;

One end of the first capacitor is connected to the power supply terminal of the touch chip, and the other end of the second capacitor is connected to the ground terminal of the touch chip.
3. The touch device according to claim 2, wherein when the touch chip does not send an uplink signal, the first switch and the third switch are closed, and the second switch is opened.
The touch device of claim 3, wherein when the touch chip sends an uplink signal, the first switch and the third switch are opened, and the second switch is closed.
The touch device according to claim 1, wherein the touch device comprises a communication circuit, and the communication circuit is used to improve the reliability of communication between the touch chip and the host system.
An electronic device, wherein the electronic device comprises the touch device according to any one of claims 1 to 5, and the amplitude of the uplink signal sent by the electronic device is equal to the first uplink signal and the The sum of the amplitude superimposition of the second uplink signal.
A touch interactive system, wherein the touch interactive system comprises the electronic device as claimed in claim 6 and the corresponding uplink signal receiving device.
8. The touch interactive system according to claim 7, wherein the uplink signal receiving device comprises an active pen.
The touch interactive system according to claim 8, wherein the communication protocol of the touch interactive system comprises a USI protocol.