CN113934328A

CN113934328A - Touch detection device, touch screen, electronic equipment and touch system

Info

Publication number: CN113934328A
Application number: CN202111235144.1A
Authority: CN
Inventors: 唐玲裕; 丁常坤; 彭良广
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-01-14

Abstract

The application provides a touch-control detection device, it links to each other with the electrode in the touch-control screen, touch-control detection device includes: the control module is used for controlling short circuit between the first end and the second end of the electrode so as to generate a capacitance signal on the electrode when the target touches the touch screen, and controlling the electrode to form a coil loop so as to generate a current signal on the coil loop when the target outputs an electromagnetic signal to the touch screen; and the detection module is used for detecting the capacitance signal and the current signal. The touch detection device can simultaneously realize touch detection of the touch screen on fingers and the electromagnetic pen without increasing more cost.

Description

Touch detection device, touch screen, electronic equipment and touch system

Technical Field

The embodiment of the application relates to the technical field of touch control, and more particularly, to a touch detection device, a touch screen, an electronic device and a touch system.

Background

The current touch screen supports the touch operation of fingers, but the operation precision and the resolution of the fingers are low, and only some rough touch operations can be completed. And the touch operation of the touch pen on the touch screen can obtain better precision and resolution, so that some complex touch operations, such as drawing, text editing, annotation and the like, can be realized. The stylus includes a capacitive active stylus and an electromagnetic stylus. Because the electromagnetic pen is worked passively, its core part need not supply power, and the volume is less, is convenient for carry as an organic whole with electronic equipment to can bring better operating accuracy and user experience, therefore present touch-control screen is except that the touch-control operation of supporting finger still needs the touch-control operation of compatible electromagnetic pen.

In order to support the use of the electromagnetic pen, the touch screen needs to include an electromagnetic resonance system for detecting the touch operation of the electromagnetic pen in addition to the original capacitive detection system for detecting the touch operation of the finger, and the two independent detection systems significantly increase the cost of the touch screen. Therefore, how to simultaneously realize the touch detection of the touch screen on the finger and the electromagnetic pen at lower cost becomes a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a touch detection device, a touch screen, an electronic device and a touch system, which can simultaneously realize touch detection of the touch screen on fingers and an electromagnetic pen without increasing more cost.

In a first aspect, a touch detection device is provided, which is connected to an electrode in a touch screen, and includes:

the control module is used for controlling short circuit between the first end and the second end of the electrode so as to generate a capacitance signal on the electrode when the target touches the touch screen, and controlling the electrode to form a coil loop so as to generate a current signal on the coil loop when the target outputs an electromagnetic signal to the touch screen; and the number of the first and second groups,

and the detection module is used for detecting the capacitance signal and the current signal.

In the embodiment of the present application, the touch detection device controls the connection mode of the first end and the second end of the electrode in the touch screen, and detects signals on the electrode in different connection modes. When the control module controls the two ends of the electrode to be in short circuit, the detection module can detect a capacitance signal caused by target touch on the electrode, so that the detection of the capacitance signal of the target is realized; when the control module controls the electrode to form a coil loop, the detection module can detect a current signal induced on the loop by an electromagnetic signal output by a target on the electrode, so that the detection of the electromagnetic signal of the target is realized. Since the same electrode is shared for both capacitive detection and electromagnetic detection of the target, no additional cost is required.

In one possible implementation manner, the touch detection apparatus further includes: and the driving module is used for outputting a driving signal to the electrode.

In a possible implementation manner, the control module is specifically configured to: controlling a first end and a second end of the electrode to be simultaneously connected to an output end of the driving module so that the driving module outputs a driving signal to the electrode in a first period; and/or controlling the first end and the second end of the electrode to be connected to the first input end of the detection module at the same time so as to enable the detection module to detect the capacitance signal.

In one possible implementation, the control module is further configured to: in a second time interval, controlling the first end of the electrode to be connected to the output end of the driving module, the second end of the electrode to be connected to the common port, and the first end of the electrode to be disconnected from the detection module, so that the driving module outputs a driving signal to the coil loop; and controlling a first end of the electrode to be connected to a first input end of the detection module, and a second end of the electrode to be connected to the common port, so that the detection module detects the current signal.

In a possible implementation manner, a first switch is disposed between the second end of the electrode, the driving module and the common port, and the first switch is configured to communicate the second end of the electrode with the driving module in the first period and communicate the second end of the electrode with the common port in the second period; and a second switch is arranged between the detection module and the first end of the electrode and is used for controlling the connection and disconnection between the electrode and the detection module in the second period.

Or, in another possible implementation manner, a third switch is disposed between the second end of the electrode and the driving module, and the third switch is used for communicating the second end of the electrode and the driving module in the first period; a fourth switch is arranged between the second end of the electrode and the common port and is used for communicating the second end of the electrode and the common port in the second period; and a second switch is arranged between the detection module and the first end of the electrode and is used for controlling the connection and disconnection between the electrode and the detection module in the second period.

Further, in a possible implementation manner, a fifth switch is disposed between the first end of the electrode and the driving module, and the fifth switch is configured to communicate the first end of the electrode and the driving module in the first period and the second period.

In this way, switches are arranged on part of lines among the first end, the second end, the driving module and the detection module of the electrode, and the connection and disconnection of each line are realized by controlling each switch, so that the two ends of the electrode are in short circuit in a first period of time, and the two ends of the electrode are connected to different potentials in a second period of time to form a coil loop.

In one possible implementation, the common port is a system ground of the touch screen; or, the common port is a port with a preset level.

In one possible implementation, the second end of the electrode is connected to the common port, including: a second end of the electrode is directly connected to the common port through a switch; or the second end of the electrode is connected to the common port after being connected in series with other at least one electrode arranged in the same direction through a switch, so as to form the coil loop consisting of the electrode and other at least one electrode.

Because the control module controls the plurality of electrodes to be connected in series to form a larger coil loop, when targets such as an electromagnetic pen and the like output electromagnetic signals to the coil loop, stronger current signals can be induced on the coil loop, and the performance of touch detection is improved.

In a possible implementation manner, the detection module includes a single-ended amplifier and a detection resistor, where the detection resistor is located between a first input terminal and an output terminal of the single-ended amplifier or between a first input terminal and a second input terminal of the single-ended amplifier, the first input terminal is used to connect the first end of the electrode, and the second input terminal is used to connect the common port.

In a possible implementation manner, the detection module includes a differential amplifier, detection resistors are respectively disposed between a first input end and a first output end of the differential amplifier and between a second input end and a second output end of the differential amplifier, or a detection resistor is disposed between the first input end and the second input end of the differential amplifier, the first input end is used for connecting the first end of the electrode, and the second input end is used for connecting the common port.

In a possible implementation manner, the touch detection device further includes a filtering module, and the filtering module is configured to perform low-pass filtering on the signal output by the detection module in the first time period, and perform band-pass filtering on the signal output by the detection module in the second time period.

In a possible implementation manner, the electrode includes two segments disposed oppositely, the first end and the second end, one ends of the two segments located on the same side are connected, and the other ends of the two segments form the first end and the second end respectively.

In a second aspect, a touch screen is provided, which includes the touch detection device in the first aspect or any possible implementation manner of the first aspect, and a plurality of electrodes connected to the touch detection device.

In a third aspect, an electronic device is provided, which includes the touch screen in the second aspect or any possible implementation manner of the second aspect.

In a fourth aspect, a touch system is provided, which includes the touch screen in the third aspect or any possible implementation manner of the third aspect, and an electromagnetic pen.

Drawings

Fig. 1 is a schematic diagram of a touch screen.

Fig. 2 is a schematic view of a touch screen of a touch detection device to which the embodiment of the present disclosure is applied.

Fig. 3 is a schematic diagram of an electromagnetic pen.

Fig. 4 is a schematic block diagram of a touch detection device according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a detection timing sequence of the touch detection device.

FIG. 6 is a schematic diagram of mutual capacitance detection.

FIG. 7 is a schematic diagram of self-contained detection.

FIG. 8 is a schematic of electromagnetic signal detection.

Fig. 9 is a schematic diagram of electromagnetic signal detection.

FIG. 10 is a schematic diagram of a detection module according to an embodiment of the present application.

FIG. 11 is a schematic diagram of a detection module according to an embodiment of the present application.

FIG. 12 is a schematic diagram of a detection module according to an embodiment of the present application.

FIG. 13 is a schematic diagram of a detection module according to an embodiment of the present application.

Fig. 14 is a schematic diagram of a specific implementation of the touch detection device.

Fig. 15 is a schematic block diagram of a touch screen according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

Mobile devices in the current market, such as smart phones, tablet computers, notebook computers and the like, have abundant display screen human-computer interaction interfaces. From the functional viewpoint, some electronic devices support only the operation of a finger, and some electronic devices support both the operation of a finger and the operation of a stylus (hereinafter, simply referred to as "pen"). Technically, a capacitive detection technology is basically integrated on a touch screen of the electronic equipment, and the capacitive detection technology supports both the operation of a finger and the operation of a capacitive pen; in addition to the integrated capacitive detection technology, electromagnetic resonance technology is also integrated on other electronic devices to support the operation of the electromagnetic pen. From the aspect of human-computer interaction experience, when a finger operates on a touch screen, the coordinate precision of the position of the finger is low, and only some rough operations can be generally performed; the coordinate control precision of the pen is higher, and some special operations such as drawing, text editing, annotation and the like can be realized. The pen includes electric capacity initiative pen (for short initiative pen or electric capacity pen) and electromagnetism resonance pen (for short electromagnetism pen), and wherein, the electromagnetism pen is passive work, and its core component need not supply power, and the volume is less, is convenient for carry as whole with electronic equipment to can bring more excellent operation precision and user experience, consequently present touch-control screen is except that the touch-control operation of supporting finger and electric capacity pen, still the touch-control operation of compatible electromagnetism pen. In terms of cost, the conventional touch screen can realize capacitance detection, and if the electronic equipment needs to support the function of a capacitance pen, the cost is mainly increased by the capacitance pen, so that the cost of the capacitance pen is higher than that of an electromagnetic pen; if the electronic device needs to support the function of the electromagnetic pen, the touch screen needs to separately add a sensor and a controller supporting an electromagnetic Resonance technology in addition to the integrated capacitance detection function, for example, as shown in fig. 1, the touch screen 10 includes a capacitive touch panel 110, a display panel 120, and an electromagnetic induction (EMR) panel 130, and the two separate systems of the capacitive touch panel 110 and the EMR panel 130 result in a significant increase in the cost of the touch screen 10.

Therefore, the touch screen can simultaneously realize touch detection on the finger and the electromagnetic pen without increasing more cost.

Fig. 2 is a schematic view of a touch screen of a touch detection device to which the embodiment of the present disclosure is applied. As shown in fig. 2, a plurality of sensors, hereinafter also referred to as electrodes or channels, are disposed in the touch screen 10. The touch screen 10 has a plurality of rows and columns of electrodes arranged in a staggered manner, wherein the number of the horizontal electrodes and the number of the vertical electrodes can be set based on the size of the touch screen 10 and the requirement of touch detection, for example, a 20-row × 40-column electrode array is formed, or a 40-row × 40-column electrode array is formed. Only a small number of electrodes are illustrated in fig. 2 to illustrate the technical solution of the present application, where TX1, TX2, and TX3 are transverse electrodes, and RX1, RX2, and RX3 are longitudinal electrodes. In the embodiments of the present application, the transverse electrode is taken as a driving electrode, and the longitudinal electrode is taken as an induction electrode or a receiving electrode for example.

Fig. 2 shows, as an example, a strip-shaped electrode, which is bent to form two parallel segments, wherein the ends of the two segments opposite to the bent portion form a first end and a second end of the electrode, respectively. Taking electrode TX1 as an example, the first end and the second end of electrode TX1 are TX1-a and TX1-b, respectively. The first end and the second end of each electrode are used for being connected with the touch detection device in the embodiment of the application, and the touch detection device can control the connection mode of the first end and the second end of each electrode, so that the capacitive detection and the electromagnetic detection of a target are realized. In fig. 2, the lateral electrodes and the longitudinal electrodes are located in different stacks.

Fig. 3 (a) shows an electromagnetic pen, which may be equivalent to the parallel structure of the coil inductance and the capacitance shown in fig. 3 (b). In addition, in order to enrich the function of the electromagnetic pen, other devices such as a switch and the like may be provided in an equivalent circuit of the electromagnetic pen, which is not shown in fig. 3.

Fig. 4 is a schematic block diagram of a touch detection device according to an embodiment of the present application. The touch detection device 400 is connected to an electrode in the touch screen, the electrode may be, for example, the electrode shown in fig. 2, and has two segments disposed oppositely, a first end and a second end, one end of the two segments located on the same side is connected to the other end of the two segments, and the other end of the two segments forms the first end and the second end of the electrode, respectively.

When the first end and the second end are in short circuit, the electrode is used for detecting a capacitance signal when a target touches the touch screen; when the two segments, the first end and the second end form a coil loop, the electrode is used for detecting an electromagnetic signal output by a target to the touch screen.

Taking the electrode TX1 in fig. 2 as an example, when the electrode TX1 is used for detecting a capacitance signal, the touch detection device 400 controls the first terminal TX1-a and the second terminal TX-b of the electrode TX1 to be short-circuited, so that two segments of the electrode form a whole, a coil loop capable of flowing current cannot be generated inside the electrode, and thus the electrode cannot be affected by an electromagnetic signal.

When the electrode TX1 is used to detect an electromagnetic signal, the electrode needs to form a coil loop capable of carrying a current signal to induce a current signal according to the received electromagnetic signal, and a potential difference needs to be present between the first end and the second end of the electrode. At this time, the touch detection device 400 may control the first terminal TX1-a and the second terminal TX-b of the electrode TX1 to be respectively connected to different potentials, so that the electrode can be used as a part of a coil loop to carry a current signal, and when a driving signal is input to the coil loop, a current is generated in the coil loop, and a magnetic field is induced to emit an electromagnetic signal. If an electromagnetic pen is arranged above the touch screen, after the electromagnetic pen receives an electromagnetic signal emitted by the electrode, an LC oscillating circuit in the pen starts oscillating. When the electrode stops transmitting the electromagnetic signal, the LC oscillating circuit in the electromagnetic pen still keeps oscillating and reversely outputs the electromagnetic signal to the touch screen, and at the moment, a coil loop formed by the electrode can sense the electromagnetic signal output by the electromagnetic pen. According to the strength of the electromagnetic signals sensed in different directions, the pen point position of the electromagnetic pen can be determined.

It should be understood that in the embodiments of the present application, the electrode forms a coil loop, which may mean that the electrode is included in the coil loop, i.e., includes two segments of the electrode, a first end and a second end; it may also mean that the electrode is part of a coil loop, i.e. that there may also be other conductors in the coil loop.

As shown in fig. 4, the touch detection apparatus 400 includes a control module 410 and a detection module 420.

The control module 410 is configured to control a short circuit between the first end and the second end of the electrode, so as to generate a capacitance signal on the electrode when a target touches the touch screen; and the electrode is used for controlling the electrode to form a coil loop so as to generate a current signal on the coil loop when the target outputs an electromagnetic signal to the touch screen.

The detection module 420 is used for detecting the capacitance signal and the current signal.

It should be understood that the touching of the touch screen by the object, which may be, for example, a finger, an electromagnetic pen, etc., includes direct contact with the touch screen and proximity to the touch screen.

In this embodiment, the touch detection apparatus 400 controls the connection mode of the first end and the second end of the electrode in the touch screen, and detects signals on the electrode in different connection modes. When the control module 410 controls the two ends of the electrode to be short-circuited, the detection module 420 may detect a capacitance signal caused by a target touch on the electrode, so as to implement capacitance detection on the target; when the control module 410 controls the electrode to form a coil loop, the detection module 420 may detect a current signal induced on the loop by an electromagnetic signal output by the target on the electrode, so as to achieve electromagnetic detection on the target. Since the same electrode is shared for both capacitive detection and electromagnetic detection of the target, no additional cost is required.

For example, as shown in fig. 2, the electrode is a strip-shaped electrode, the strip-shaped electrode is bent to form two parallel sections, and one end of the two sections opposite to the bent position forms a first end and a second end of the electrode respectively. Taking electrode TX1 as an example, the first end and the second end of electrode TX1 are TX1-a and TX1-b, respectively.

When the electrode is used for detecting a capacitance signal when a target touches the touch screen, the first end and the second end of the electrode are in short circuit, so that the two sections of the electrode form a whole, a coil loop capable of flowing current cannot be generated in the electrode, and a current signal cannot be generated under the influence of an electromagnetic signal; when the electrode is used for detecting an electromagnetic signal output by a target to the touch screen, the electrode needs to form a coil loop capable of flowing current so as to induce a current signal according to the received electromagnetic signal, and therefore, a potential difference needs to be present between the first end and the second end of the electrode, for example, the first end and the second end may be respectively connected to different potentials, so that a coil loop consisting of the first end, the second end and two segments is formed.

Further, the touch detection device 400 may further include a driving module 430, and the driving module 430 is configured to output a driving signal to the electrodes. When detecting the capacitance signal corresponding to the target such as the finger or the capacitance pen, and detecting the electromagnetic signal corresponding to the target such as the electromagnetic pen, the driving signals output by the driving module 430 may be different, for example, the parameters such as the frequency and the amplitude may be different.

Fig. 5 shows a detection timing sequence of the touch detection apparatus 400. The touch detection device 400 detects the capacitive signal and the electromagnetic signal in a time-sharing manner. As shown in fig. 5, in a detection cycle, the touch detection device 400 detects a capacitance signal of a target during a first time period T1, and determines touch information of the target according to the capacitance signal. In the first time period T1, the touch detection apparatus 400 may perform mutual capacitance detection, that is, detect the mutual capacitance between the two electrodes in the horizontal and vertical directions; self-capacitance detection, i.e. detecting the self-capacitance of each electrode to ground, may also be performed; or alternatively perform self-capacitance detection and mutual capacitance detection, such as shown in fig. 5, wherein a time t3 may be set between the self-capacitance detection and the mutual capacitance detection for switching the operating state.

In the second time period T2, the touch detection device 400 detects an electromagnetic signal of the target and determines touch information of the target according to the electromagnetic signal. A time T4 may be spaced between the first period T1 and the second period T2 for switching of the operation state. The second period T2 may include a period of electromagnetic signal driving and a period of electromagnetic signal receiving, and a time T5 may be spaced between the two periods for switching of the operation state. In the period of driving by the electromagnetic signal, the driving module 430 outputs a driving signal to the electrode, so that the coil loop of the TX electrode generates and outputs the electromagnetic signal, and when an electromagnetic pen is located above the touch screen, an oscillation circuit in the electromagnetic pen can be excited to start oscillation. When the electrode stops transmitting the electromagnetic signal, the oscillating circuit in the electromagnetic pen still keeps oscillating and reversely outputs the electromagnetic signal to the touch screen. During the period of receiving the electromagnetic signal, the coil loop of the electrode induces the electromagnetic signal and generates a current in the coil loop, and the detection module detects the current signal and converts the current signal into a voltage signal for determining the touch information of the target.

It should be understood that fig. 5 is only an illustration, and the sequence and duration of the first time period T1 and the second time period T2 are not limited in the embodiments of the present application.

In one implementation, a first switch K1 is disposed between the second end of the electrode, the driving module 430 and the common port, the first switch K1 is used for communicating the second end of the electrode and the driving module 430 during a first period T1, and communicating the second end of the electrode and the common port during a second period T2; a second switch K2 is disposed between the sensing module 420 and the first end of the electrode, and a second switch K2 is used to control the connection and disconnection between the electrode and the sensing module 420 for a second period T2.

Or, in another implementation, a third switch K3 is disposed between the second end of the electrode and the driving module 430, and the third switch K3 is used for communicating the second end of the electrode and the driving module 430 during a first period T1; a fourth switch K4 is provided between the second end of the electrode and the common port for communicating the second end of the electrode and the common port for a second period T2; a second switch K2 is disposed between the sensing module 420 and the first end of the electrode, and the second switch K2 is used for controlling the connection and disconnection between the electrode and the sensing module 420 for a second period T2.

Further, in one implementation, a fifth switch K5 is disposed between the first end of the electrode and the driving module 430, and the fifth switch K5 is used to connect the first end of the electrode and the driving module 430 for the first period T1 and the second period T2.

In this way, switches are provided on a portion of the lines between the first and second ends of the electrode, the driving module 430 and the detecting module 420, and by controlling the respective switches, the respective lines are turned on and off so as to short-circuit the two ends of the electrode for the first period T1, and connect the two ends of the electrode to different potentials for the second period T2 to form a coil loop.

The common port is a fixed potential, for example, the common port can be a system ground GND of the touch panel or a predetermined level V_comThe port of (2). Hereinafter, the common port is set as a predetermined level V_comFor example. Wherein, V_comE.g. equal to the supply voltage V_CCOr equal to the power supplyHalf of the voltage, i.e. V_com＝V_CC/2。

In the embodiment of the present application, the control module 410 may control the connection manner between the first end and the second end of the electrode, for example, in the following manner.

During a first period T1, the control module 410 controls the first and second ends of the electrode to be connected to the output end of the driving module 430 at the same time, so that the driving module 430 outputs a driving signal to the electrode; and/or the first end and the second end of the control electrode are simultaneously connected to the first input end of the detection module 420, so that the detection module 420 detects a capacitance signal when a target touches the touch screen.

Specifically, the touch detection device 400 detects the capacitive signal and the electromagnetic signal in a time-sharing manner, detects the capacitance of the target during the first time period T1, and detects the electromagnetic signal of the target during the second time period T2. In the first time period T1, when performing mutual capacitance detection, the control module 410 controls the first end and the second end of the driving electrode to be simultaneously connected to the output end of the driving module 410, the driving module 410 sequentially outputs a driving signal to each driving electrode, and controls the first end and the second end of each detecting electrode to be simultaneously connected to the first input end of the detecting module 420, and the detecting module 420 detects a mutual capacitance signal between each detecting electrode and the driving electrode, and converts the mutual capacitance signal into a voltage signal, so as to determine information such as a touch position of an object.

For example, as shown in fig. 6, when mutual capacitance detection is performed, taking the electrode TX1 and the electrode RX1 as an example, the switch K1 and the switch K5 corresponding to the electrode TX1 and the electrode RX1 respectively are closed, the first terminal TX1-a and the second terminal TX1-b of the electrode TX1 are simultaneously connected to the driving module 430, and the first terminal RX1-a and the second terminal RX1-b of the electrode RX1 are simultaneously connected to the detecting module 420. The driving module 430 inputs a driving signal for mutual capacitance detection to the electrode TX1, and the detecting module 420 receives a mutual capacitance signal between the electrode TX1 and the electrode RX 1. When a target touches the touch screen, the mutual capacitance signal between electrode TX1 and electrode RX1 may change, and based on the change in the capacitance signal, the relevant touch information may be determined.

In the first period T1, when performing self-capacitance detection, the control module 410 controls the first end and the second end of each electrode to be simultaneously connected to the output end of the driving module 230, the driving module 430 outputs a driving signal to the electrode, and controls the first end and the second end of the electrode to be simultaneously connected to the first input end of the detection module, and the detection module 420 detects a self-capacitance signal of the electrode to ground and converts the self-capacitance signal into a voltage signal for determining information such as a touch position of a target.

For example, as shown in fig. 7, when performing self-capacitance detection, taking an electrode TX1 and an electrode RX1 as an example, a switch K1 and a switch K5 corresponding to the electrode TX1 and the electrode RX1 respectively are closed, a first end TX1-a and a second end TX1-b of the electrode TX1 are simultaneously connected to a corresponding driving module 430, a first end TX1-a and a second end TX1-b of the electrode TX1 are simultaneously connected to a corresponding detecting module 420, the driving module 430 inputs a driving signal for self-capacitance detection to the electrode TX1, and the detecting module 420 receives a self-capacitance signal of the electrode TX 1. Similarly, the first terminal RX1-a and the second terminal RX1-b of the electrode RX1 are simultaneously connected to their corresponding driving modules 430, and the first terminal RX1-a and the second terminal RX1-b of the electrode RX1 are simultaneously connected to their corresponding detecting modules 420, the driving modules 430 input driving signals for self-capacitance detection to the electrode RX1, and the detecting modules 420 receive self-capacitance signals of the electrode RX 1. When a target touches the touch screen, the self-capacitance of electrode TX1 and the self-capacitance signal of electrode RX1 may change, and based on the change in the self-capacitance signal of each electrode, the associated touch information may be determined.

In a second time period T2, the control module 410 controls the first end of the electrode to be connected to the output end of the driving module 430, the second end of the electrode to be connected to the common port, and the first end of the electrode is disconnected from the detection module 420, so that the driving module 430 outputs a driving signal to the coil loop; then, the first end of the electrode is controlled to be connected to the first input end of the detection module 420, and the second end of the electrode is connected to the common port, so that the detection module 420 detects the current signal in the coil loop.

Specifically, in the second time period T2, when the touch detection device 400 detects the electromagnetic signal of the target, the control module 410 controls the first end of the TX electrode to be connected to the output end of the driving module 430, and the second end of the TX electrode is connected to the common port, so that the driving electrode forms a coil loop, and the driving module 430 outputs a driving signal to the coil loop. The drive signal causes a current to be generated within the coil loop, which in turn generates a magnetic field and emits an electromagnetic signal. If the electromagnetic pen is arranged above the touch screen, the internal oscillating circuit starts to oscillate after the electromagnetic pen receives the electromagnetic signal. When the electrode stops transmitting the electromagnetic signal, the oscillation circuit still keeps oscillating and reversely outputs the electromagnetic signal to the touch screen. Then, the control module 410 controls the first end of the driving electrode and the first end of the detecting electrode to be respectively connected to the first input end of the respective corresponding detecting module 420, and the second end is connected to the common port to form a coil loop, through which an electromagnetic signal output by the electromagnetic pen is induced and a current is generated in the coil loop. The detection module 420 detects the current signal and converts the current signal into a voltage signal for determining information such as a pen tip position of the electromagnetic pen.

For example, as shown in fig. 8, taking electrode TX1 and electrode RX1 as an example, during the period of detecting the electromagnetic signal of the target, switch K5 corresponding to each electrode is closed, and switch K1 is closed to position 1. It should be understood that switch K1 may be a single pole double throw switch that may be connected to either position 1 or position 2. As shown in FIG. 8, position 1 may be V_comPosition 2 may be the output of the driver module 430. When the switch K1 is closed to position 1, the second terminal of each electrode and V can be turned on_comWhen the switch K1 is closed to position 2, the second end of each electrode and the driving module 430 may be turned on.

Taking the electrode TX1 as an example, in the period of driving by the electromagnetic signal, the switch K2 is turned off, and the driving module 430 inputs the driving signal to the first terminal TX1-a of the electrode TX 1; during the period of electromagnetic signal reception, switch K2 is closed, and detection module 420 can detect the current signal generated on electrode TX1 by the electromagnetic signal output by the target.

Here, the electrode to which the driving module 430 is connected may be a TX electrode or an RX electrode. Alternatively, the driving module 430 is connected to both the TX electrode and the RX electrode. When the driving module 430 is connected, the electrode may serve as a driving electrode, thereby outputting an electromagnetic signal. Similarly, the electrode to which the detection module 420 is connected may be a TX electrode or an RX electrode. Alternatively, the TX electrode and the RX electrode are both connected to the detection module 420. When the detecting module 420 is connected, the electrode can be used as a detecting electrode, so that a corresponding current signal is induced according to the received electromagnetic signal. In the embodiment of the present application, for example, as shown in fig. 8, a TX electrode is used as a driving electrode, and a TX electrode and an RX electrode are used as a detection electrode.

During the period of electromagnetic signal reception, since the first terminal TX1-a of the electrode TX1 accesses the corresponding detection module 420 through the switch K5, the second terminal TX1-b of the electrode TX1 accesses V through the switch K1_comThe first terminal RX1-a of the electrode RX1 is connected to the corresponding detection module 420 through the switch K5, and the second terminal RX1-b of the electrode RX1 is connected to V through the switch K1_comThus, electrode TX1 and electrode RX1 each form a coil loop to induce an electromagnetic signal output by the target through the coil loop.

FIG. 8 is only an example, instead of the single-pole double-throw switch K1, a third switch K3 may be provided between the second terminal TX1-b of the electrode TX1 and the driving module 430, and the second terminal of the electrode and V_comBetween which a fourth switch K4 is arranged. That is, the above-mentioned switch K1 is replaced with a switch K3 connected between the second end of the electrode and the driving module 430, and a switch K3 connected between the second end of the electrode and V_comSwitch K4 in between. Wherein, in the first period T1, the switch K3 is closed to turn on the second terminal of the electrode and the driving module 430; during a second period T2, the switch K4 is closed to turn on the second terminal of the electrode and V_com。

The second end of the electrode can be directly connected to V through a switch_comSuch as shown in fig. 8. Alternatively, the second end of the electrode can be connected to V by a switch in series with at least one other electrode arranged in the same direction_comTo form a coil loop consisting of the electrode and at least one other electrode. For example, as shown in FIG. 9, the electrodes TX1 and TX2 arranged in the same direction, i.e. transversely, are connected together through a switch, specifically, the second end TX1-b of the electrode TX1 is connected with the first end TX2-a of the electrode TX2 through a switch, and the second end TX2 is connected with the second end TX2TX2-b Access V_comTogether, electrode TX1 and electrode TX2 form a larger coil loop. Similarly, electrode RX1 and electrode RX2 may be connected together in the same manner to form a larger coil loop. When the target outputs an electromagnetic signal to the coil loop, a stronger current signal can be induced on the coil loop, and the performance of touch detection is improved. Fig. 9 is an example of a combination of two electrodes, and in practical applications, a larger number of electrodes can be connected to form a larger induction coil.

In the embodiment of the present application, the detection module 420 may have several forms as shown in fig. 10 to 13, for example. In fig. 10 to 13, when the transverse electrodes and the longitudinal electrodes are used to form a coil loop to induce an electromagnetic signal output by a target, L and Rs represent inductance and impedance of the coil loop, respectively.

As shown in fig. 10, the detection module 420 includes a single-ended amplifier 421 and a detection resistor Rf, which is located between a first input terminal of the single-ended amplifier 421 and the output terminal Vout. The first input terminal is for connection to a first terminal of an electrode, and the second input terminal of the single-ended amplifier 421 is for connection to a common port V_com. Here, the first input terminal and the second input terminal are taken as a negative input terminal and a positive input terminal, respectively.

As shown in fig. 11, the detection module 420 comprises a single-ended amplifier 421 and a detection resistor Zi, which is located between a first input terminal and a second input terminal of the single-ended amplifier 421. The first input terminal is used for connecting the first terminal of the electrode, and the second input terminal is connected to the common port V_com. Here, the first input terminal and the second input terminal are respectively a positive input terminal and a negative input terminal.

As shown in fig. 12, the detection module 420 includes a differential amplifier 422, a detection resistor Rf1 and a detection resistor Rf2, wherein the detection resistor Rf1 is located between the first input terminal and the first output terminal Vout-of the single-ended amplifier 421, and the detection resistor Rf2 is located between the second input terminal and the second output terminal Vout + of the single-ended amplifier 421. The first input terminal is used for connecting the first terminal of the electrode, and the second input terminal is connected to the common port V_com. The first input terminal and the second input terminal are respectively a positive input terminal and a negative input terminalFor example, the input terminal, and the first output terminal and the second output terminal are respectively a negative output terminal and a positive output terminal.

As shown in fig. 13, the detection module 420 includes a differential amplifier 422 and a detection resistor Zi between the first input terminal and the second input terminal of the single-ended amplifier 421. The first input terminal is used for connecting the first terminal of the electrode, and the second input terminal is connected to the common port V_com. Here, it is exemplified that the first input terminal and the second input terminal are a positive input terminal and a negative input terminal, respectively, and the first output terminal and the second output terminal are a negative output terminal and a positive output terminal, respectively.

In one implementation, the touch detection apparatus 400 further includes a filtering module 440. The filtering module 440 is used for low-pass filtering the signal output by the detection module 420 during the first period T1 and band-pass filtering the signal output by the detection module 420 during the second period T2.

Fig. 14 shows a possible specific implementation manner of the touch detection device 400. As shown in fig. 14, the touch detection apparatus 400 may include a control module 410, a switch module 470, a driving module 430, a detection module 420, a filtering module 440, an Analog-to-Digital Converter (ADC) 450, a Digital demodulation module 460, a data processing module, and the control module 410. The switch module 470 includes at least the aforementioned switches K1 to K5, for example.

When the touch detection device 400 operates in the capacitance detection mode, the data processing module and control module 410 controls the driving module 430, the switch module 470, the ADC450, and the digital demodulation module 460 to operate. When mutual capacitance and self-capacitance detection are performed, the driving module 430 generates a driving signal of self-capacitance or mutual capacitance, the driving signal is sent to a TX electrode and an RX electrode through the switching module 470, the detecting module 420 receives a signal on the electrodes and sends the signal to the filtering module 440 at the subsequent stage, the interference of a high-frequency signal is filtered by a low-pass filter in capacitance detection, and the signal enters the ADC450 after being processed by the filtering module 440, so that an analog signal is converted into a digital signal. Then, the digital demodulation module 460 demodulates the same frequency signal related to driving, converts the same frequency signal into a direct current signal, changes of the direct current signal are related to the touch state of the target, the data processing module calculates the touch position of the target on the touch screen, namely coordinate information, and finally outputs the coordinate information to the main controller of the electronic device.

When the touch detection device 400 operates in the electromagnetic signal detection mode, the data processing module and control module 410 controls the driving module 430, the switch module 470, the ADC450, and the digital demodulation module 460 to operate. Upon detection of the electromagnetic signal, the driving module 430 generates an ac driving signal, which is transmitted to the TX electrode via the switching module 470. If there is an electromagnetic pen above the touch screen, the electromagnetic pen may generate a resonant signal after a period of driving, and then the control module 410 controls the driving module 410 to turn off, and controls the switch module 470 to make the TX electrode and the RX electrode in a receiving state, so as to receive the electromagnetic signal fed back from the electromagnetic pen. Meanwhile, the detection module detects the electromagnetic signals on the electrodes and sends the electromagnetic signals to the post-stage filtering module 440, the electromagnetic signal detection generally adopts a band-pass filter to filter the interference of out-of-band signals, and the signals enter the ADC450 after being processed by the filtering module 440, so that analog signals are converted into digital signals. Then, the digital demodulation module 460 demodulates the driving-related common-frequency signal and converts the driving-related common-frequency signal into a direct-current signal, the change of the direct-current signal is related to the touch state of the electromagnetic pen, the data processing module calculates the touch position, i.e. coordinate information, of the electromagnetic pen on the touch display screen and other operation states, such as whether a key on the electromagnetic pen is pressed or not, and finally outputs the coordinate information and the operation state information of the electromagnetic pen to a main controller of the electronic device.

As shown in fig. 15, the present application further provides a touch screen 1500, which includes the touch detection device 400, and a plurality of electrodes 500 connected to the touch detection device 400, where the plurality of electrodes 500 includes the TX electrode and the RX electrode.

The application further provides an electronic device, which includes a touch screen 1500.

The application also provides a touch system, which comprises a touch screen 1500 and an electromagnetic pen.

It should be noted that, without conflict, the embodiments and/or technical features in the embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination also fall within the protection scope of the present application.

The system, apparatus and method disclosed in the embodiments of the present application can be implemented in other ways. For example, some features of the method embodiments described above may be omitted or not performed. The above-described device embodiments are merely illustrative, the division of the unit is only one logical functional division, and there may be other divisions when the actual implementation is performed, and a plurality of units or components may be combined or may be integrated into another system. In addition, the coupling between the units or the coupling between the components may be direct coupling or indirect coupling, and the coupling includes electrical, mechanical or other connections.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and the generated technical effects of the above-described apparatuses and devices may refer to the corresponding processes and technical effects in the foregoing method embodiments, and are not described herein again.

It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and that various modifications and variations can be made by those skilled in the art based on the above embodiments and fall within the scope of the present application.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A touch detection device, connected to an electrode in a touch screen, the touch detection device comprising:

2. The touch detection device according to claim 1, further comprising:

and the driving module is used for outputting a driving signal to the electrode.

3. The touch detection device of claim 2, wherein the control module is specifically configured to:

controlling a first end and a second end of the electrode to be simultaneously connected to an output end of the driving module so that the driving module outputs a driving signal to the electrode in a first period; and/or the presence of a gas in the gas,

and controlling the first end and the second end of the electrode to be simultaneously connected to the first input end of the detection module so that the detection module detects the capacitance signal.

4. The touch detection device of claim 3, wherein the control module is configured to:

in a second time interval, controlling the first end of the electrode to be connected to the output end of the driving module, the second end of the electrode to be connected to the common port, and the first end of the electrode to be disconnected from the detection module, so that the driving module outputs a driving signal to the coil loop; and the number of the first and second groups,

controlling a first end of the electrode to be connected to a first input end of the detection module, and a second end of the electrode to be connected to the common port, so that the detection module detects the current signal.

5. The touch detection device of claim 4,

a first switch is arranged among the second end of the electrode, the driving module and the common port, and is used for communicating the second end of the electrode with the driving module in the first period and communicating the second end of the electrode with the common port in the second period,

and a second switch is arranged between the detection module and the first end of the electrode and is used for controlling the connection and disconnection between the electrode and the detection module in the second period.

6. The touch detection device of claim 4,

a third switch is arranged between the second end of the electrode and the driving module and is used for communicating the second end of the electrode with the driving module in the first period,

a fourth switch is arranged between the second end of the electrode and the common port and is used for communicating the second end of the electrode and the common port in the second period,

7. The touch detection device of claim 5 or 6,

a fifth switch is arranged between the first end of the electrode and the driving module, and the fifth switch is used for communicating the first end of the electrode and the driving module in the first period and the second period.

8. The touch detection device according to any one of claims 4 to 6,

the public port is a system ground of the touch screen; alternatively, the first and second electrodes may be,

the common port is a port having a preset level.

9. The touch detection device of any one of claims 4 to 6, wherein the second end of the electrode is connected to the common port, comprising:

a second end of the electrode is directly connected to the common port through a switch; alternatively, the first and second electrodes may be,

and the second end of the electrode is connected with at least one other electrode arranged in the same direction in series through a switch and then connected to the common port to form the coil loop consisting of the electrode and the at least one other electrode.

10. The touch detection device according to any one of claims 1 to 6, wherein the detection module includes a single-ended amplifier and a detection resistor, the detection resistor is located between a first input terminal and an output terminal of the single-ended amplifier or between a first input terminal and a second input terminal of the single-ended amplifier, the first input terminal is used for connecting the first end of the electrode, and the second input terminal is used for connecting a common port.

11. The touch detection device according to any one of claims 1 to 6, wherein the detection module includes a differential amplifier, and detection resistors are disposed between a first input terminal and a first output terminal and between a second input terminal and a second output terminal of the differential amplifier, or detection resistors are disposed between the first input terminal and the second input terminal of the differential amplifier, the first input terminal is used for connecting the first end of the electrode, and the second input terminal is used for connecting a common port.

12. The touch detection device according to any one of claims 1 to 6, further comprising a filtering module, wherein the filtering module is configured to perform low-pass filtering on the signal output by the detection module during the first period and perform band-pass filtering on the signal output by the detection module during the second period.

13. The touch detection device according to any one of claims 1 to 6, wherein the electrode includes two segments disposed oppositely, the first end and the second end, one ends of the two segments located on the same side are connected, and the other ends of the two segments form the first end and the second end, respectively.

14. A touch screen, comprising:

the touch detection device of any of claims 1-13; and the number of the first and second groups,

and the electrodes are connected with the touch detection device.

15. An electronic device comprising the touch screen of claim 14.

16. A touch system, comprising:

the touch screen of claim 14; and the number of the first and second groups,

an electromagnetic pen.