Wireless communication method, active pen, touch screen, electronic device and communication system

Abstract

The present application provides a wireless communication method, which can realize accurate transmission of wireless messages between an active pen and multiple touch screens. The method is applied to wireless communication between an active pen and multiple touch screens, wherein the multiple touch screens correspond to multiple wireless channels respectively, wherein each wireless channel is used for wireless communication between the corresponding touch screen and the active pen, and the method comprises: the active pen sends a coding signal to a first touch screen, and the coding signal is used by the first touch screen to determine the position information of the active pen on the first touch screen; the active pen receives a wireless signal sent by the first touch screen, and the wireless signal is transmitted through the wireless channel corresponding to the first touch screen and carries the identification information of the first touch screen; the active pen identifies the first touch screen that the active pen is currently close to or in contact with among multiple touch screens according to the identification information of the first touch screen; and the active pen sends a wireless message to the first touch screen through the wireless channel corresponding to the first touch screen.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of information technology, and more specifically, to a wireless communication method, an active pen, a touch screen, an electronic device, and a communication system. Background Art

[0002] At present, active pens, as the main peripheral input accessories of electronic devices, are gradually attracting market attention. The tip of the active pen will emit signals, and there are a certain number of horizontal and vertical detection electrodes distributed on the touch screen. Therefore, the signals emitted from the tip of the pen can be detected by the detection electrodes, and the two-dimensional position coordinates of the tip of the pen on the touch screen can be calculated based on the detection signals.

[0003] The active pen can also be provided with a pressure sensor to detect the pressure generated by the active pen, so as to adjust the handwriting of the active pen on the touch screen according to the pressure. The pressure detected by the pressure sensor can be transmitted to the touch screen via wireless communication. When there are multiple touch screens, how the active pen can accurately transmit pressure information becomes an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide a wireless communication method, an active pen, a touch screen, an electronic device, and a communication system, which can realize accurate transmission of wireless messages between an active pen and multiple touch screens.

[0005] In a first aspect, a wireless communication method is provided, which is applied to wireless communication between an active pen and a plurality of touch screens, wherein the plurality of touch screens and the active pen correspond to a plurality of wireless channels respectively, wherein each wireless channel is used for wireless communication between a corresponding touch screen and the active pen, and the method comprises:

[0006] The active pen sends a coding signal to the first touch screen, and the coding signal is used by the first touch screen to determine the position information of the active pen on the first touch screen;

[0007] The active pen receives a wireless signal sent by the first touch screen, the wireless signal is transmitted through a wireless channel corresponding to the active pen and carries identification information of the first touch screen;

[0008] The active pen identifies, according to the identification information of the first touch screen, the first touch screen that the active pen is currently close to or in contact with among the multiple touch screens; and

[0009] The active pen sends a wireless message to the first touch screen through a wireless channel corresponding to the first touch screen.

[0010] In a possible implementation manner, the identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

[0011] In a possible implementation manner, the wireless message includes pressure information generated by the active pen on the first touch screen.

[0012] In a possible implementation, the active pen sends a coding signal to the first touch screen, including: the active pen sends a coding signal to the first touch screen, the active pen and the first touch screen are within a preset distance, and the first touch screen receives the coding signal; wherein the preset distance is less than or equal to 10 mm.

[0013] In a possible implementation, the active pen sends a coding signal to the first touch screen, including: the active pen and the first touch screen are within a preset distance, and the active pen sends a coding signal to the first touch screen within a specific time period after detecting an uplink signal; wherein the preset distance is less than or equal to 10 mm.

[0014] In a possible implementation, the preset distance is 5-10 mm.

[0015] In a possible implementation, if the first touch screen detects a coding signal, the active pen receives the wireless signal of the first touch screen, including: when the first touch screen detects that the strength of the coding signal is greater than a first threshold and the number of times the coding signal is detected is greater than a second threshold, the active pen receives the wireless signal sent by the first touch screen; wherein the first threshold and the second threshold are respectively greater than 0.

[0016] In a possible implementation, the method further includes:

[0017] If the active pen switches from the first touch screen to a second touch screen among the multiple touch screens, the active pen sends a coding signal to the second touch screen;

[0018] The active pen receives a wireless signal sent by the second touch screen, the wireless signal is transmitted through a wireless channel corresponding to the active pen and carries identification information of the second touch screen;

[0019] The active pen recognizes that the active pen switches from the first touch screen to the second touch screen according to the identification information of the second touch screen being different from the identification information of the first touch screen; and

[0020] The active pen sends a wireless message to the second touch screen through the wireless channel corresponding to the second touch screen.

[0021] In a possible implementation manner, the wireless signal includes multiple bits, and the multiple bits include an identification area used to represent the identification information.

[0022] In a possible implementation, the plurality of bits further include at least one of a check area, an auxiliary command area, and a command header area.

[0023] In a possible implementation manner, the command header area is used to indicate a pressure request of the first touch screen.

[0024] In a possible implementation manner, the wireless communication includes Bluetooth communication.

[0025] In a second aspect, a wireless communication method is provided, which is applied to wireless communication between a first touch screen among a plurality of touch screens and an active pen, wherein the plurality of touch screens correspond to a plurality of wireless channels respectively, wherein each wireless channel is used for wireless communication between a corresponding touch screen and the active pen, and the method comprises:

[0026] The first touch screen detects a coding signal sent by the active pen, and the coding signal is used by the first touch screen to determine the position information of the active pen on the first touch screen;

[0027] If the first touch screen detects the coding signal, the first touch screen sends a wireless signal to the active pen, the wireless signal is transmitted through the wireless channel corresponding to the active pen, and carries the identification information of the first touch screen, the identification information of the first touch screen is used by the active pen to identify the first touch screen currently approaching or in contact with the multiple touch screens; and

[0028] The first touch screen receives the wireless message sent by the active pen through the wireless channel corresponding to the first touch screen.

[0029] In a possible implementation manner, the identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

[0030] In a possible implementation manner, the wireless message includes pressure information generated by the active pen on the first touch screen.

[0031] In a possible implementation, the first touch screen detects the coding signal sent by the active pen, including: the first touch screen and the active pen are within a preset distance, and the first touch screen receives the coding signal sent by the active pen; wherein the preset distance is less than or equal to 10 mm.

[0032] In a possible implementation, the first touch screen detects the coding signal sent by the active pen, including: the first touch screen sends an uplink signal to the active pen, the first touch screen and the active pen are within a preset distance, the active pen receives the sent uplink signal, and within a specific time period after the first touch screen sends the uplink signal, the first touch screen receives the coding signal sent by the active pen; wherein the preset distance is less than or equal to 10 mm.

[0033] In a possible implementation, the preset distance is 5-10 mm.

[0034] In a possible implementation, if the first touch screen detects a coding signal, the first touch screen sends a wireless signal to the active pen, including: if the strength of the coding signal detected by the first touch screen is greater than a first threshold and the number of times the coding signal is detected is greater than a second threshold, the first touch screen sends a wireless signal to the active pen; wherein the first threshold and the second threshold are respectively greater than 0.

[0035] In a possible implementation, the method further includes:

[0036] If the active pen switches from the first touch screen to a second touch screen among the multiple touch screens, the second touch screen detects a coding signal sent by the active pen;

[0037] If the second touch screen detects the coding signal, the second touch screen sends a wireless signal to the active pen, the wireless signal is transmitted through the wireless channel corresponding to the active pen, and carries the identification information of the second touch screen, the identification information of the second touch screen is different from the identification information of the first touch screen, so that the active pen recognition is switched from the first touch screen to the second touch screen; and

[0038] The second touch screen receives the wireless message sent by the active pen through the wireless channel corresponding to the second touch screen.

[0039] In a possible implementation manner, the wireless signal includes multiple bits, and the multiple bits include an identification area used to represent the identification information.

[0040] In a possible implementation manner, the plurality of bits further include at least one of a check area, an auxiliary command area, and a command header area.

[0041] In a possible implementation manner, the wireless communication includes Bluetooth communication.

[0042] In a third aspect, an active pen chip is provided, comprising: the wireless communication method in the aforementioned first aspect and any possible implementation manner of the first aspect.

[0043] In a fourth aspect, a touch control chip is provided, comprising: the wireless communication method in the aforementioned second aspect and any possible implementation manner of the second aspect.

[0044] Based on the above technical solution, after the touch screen detects the coding signal of the active pen, it sends a wireless signal carrying the touch screen identification information to the active pen through its corresponding wireless channel. The active pen identifies the touch screen it is currently close to or in contact with among multiple touch screens, and uses the wireless channel corresponding to the touch screen to send a wireless message to the touch screen, thereby realizing accurate transmission of wireless messages between the active pen and multiple touch screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic diagram of an active pen.

[0046] Figure 2 It is a schematic diagram of the principle of using an active pen on a touch screen.

[0047] Figure 3 It is a schematic flowchart of the wireless communication method of an embodiment of the present application.

[0048] Figure 4 It is a schematic flowchart of the wireless communication method of an embodiment of the present application.

[0049] Figure 5 It is the timing diagram of the coding signal between the active pen and the touch screen.

[0050] Figure 6 It is the timing diagram of the uplink signal and coding signal between the active pen and the touch screen.

[0051] Figure 7 It is a schematic diagram of wireless signal.

[0052] Figure 8 It is a schematic diagram of a possible implementation method of the wireless communication method of an embodiment of the present application.

[0053] Fig. 9 It is a schematic diagram of a possible implementation method of the wireless communication method of an embodiment of the present application.

[0054] Fig.10 It is a schematic diagram of an active pen switching between multiple touch screens.

[0055] Fig.11 It is a schematic block diagram of the active pen of an embodiment of the present application.

[0056] Fig.12 is a schematic block diagram of a touch screen according to an embodiment of the present application.

[0057] Fig.13It is a schematic block diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0059] Figure 1 1 is a schematic diagram of an active pen 100. The active pen 100 includes a pen tip 101, a pen body 102, and a wireless communication module 103. The pen tip 101 can emit a coding signal through an electrode, and the coding signal can be used to calculate the coordinates of the active pen 100 on the touch screen after being detected by the touch screen. Figure 2 As shown, a certain number of detection electrodes in the vertical and horizontal directions are distributed on the touch screen, such as the driving electrodes and sensing electrodes of the mutual capacitance touch screen, which are connected to the driving circuit and the sensing circuit respectively. When the coding signal sent by the pen tip 101 acts on a certain position of the screen, the horizontal electrode and the vertical electrode corresponding to the position will generate corresponding detection signals, and the touch controller can calculate the two-dimensional position coordinates of the active pen 100 on the screen according to the detection signal.

[0060] The pen tip 101 is also connected to a pressure sensor. The pressure sensor is used to detect the pressure generated by the active pen 100 on the touch screen, so that the active pen 100 can sense the change in the user's writing force, and the touch screen can change the thickness of the handwriting according to the change in the writing force, thereby achieving an excellent user experience. The pressure information sent by the active pen 100 can be sent to the electronic device through the wireless communication module 103 in the active pen 100, and the electronic device can adjust the handwriting of the active pen 100 on the touch screen according to the pressure. When the pressure sensor detects the pressure generated by the active pen 100, it will send the pressure information to the electronic device through the wireless communication module 103.

[0061] It should be understood that the pressure generated by the active pen described in the embodiments of the present application is the pressure sent by the user through the active pen, that is, the writing pressure of the user. The user can apply pressure to the touch screen through the active pen, and different handwritings of the active pen can be presented on the touch screen according to different pressures. The pressure is detected by the pressure sensor in the active pen.

[0062] Wireless communication requires a process of establishing a connection. When a wireless connection is established between the active pen and the touch screen, the touch screen and the active pen are assigned corresponding wireless channels, and the active pen transmits wireless messages to the touch screen through the wireless channels.

[0063] In actual applications, when there are multiple touch screens, if you want the active pen to be used alternately on the multiple touch screens, the active pen first needs to establish a wireless connection with the multiple touch screens. However, since the active pen does not know which touch screen it is currently close to or in contact with, the active pen cannot know through which wireless channel to send the pressure information of the active pen, which greatly limits the use of the active pen.

[0064] To this end, an embodiment of the present application provides a wireless communication method that can achieve accurate transmission of wireless messages between an active pen and multiple touch screens.

[0065] Combine the following Figure 3 and Figure 4 , describing the operations performed by the active pen and the touch screen respectively in the wireless communication method of an embodiment of the present application.

[0066] Figure 3 3 is a schematic flow chart of a wireless communication method 300 of an embodiment of the present application. The method can be performed by an active pen. The method is used for wireless communication between an active pen and multiple touch screens. The multiple touch screens correspond to multiple wireless channels, respectively, and each wireless channel is used for wireless communication between the touch screen corresponding to the active pen. Figure 3 As shown, method 300 may include some or all of the following steps.

[0067] In 310 , the active pen sends a coding signal to the first touch screen.

[0068] The coding signal is used by the first touch screen to determine the position information of the active pen on the first touch screen.

[0069] In 320, the active pen receives a wireless signal sent by the first touch screen, wherein the wireless signal is transmitted through a wireless channel corresponding to the active pen and carries identification information of the first touch screen.

[0070] The identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

[0071] The identification information is specified by a communication protocol, for example, the communication protocol may be a Bluetooth or Wireless Fidelity (Wi-Fi) communication protocol.

[0072] In 330 , the active pen identifies the first touch screen that the active pen is currently close to or in contact with among the multiple touch screens according to the identification information of the first touch screen.

[0073] In 340, the active pen sends a wireless message to the first touch screen through the wireless channel corresponding to the first touch screen.

[0074] The wireless message includes pressure information generated by the active pen on the first touch screen.

[0075] The active pen can be paired or connected with multiple touch screens, but at a certain moment, the active pen can only be used on one of the multiple touch screens, so the active pen can only perform wireless communication with one touch screen at this moment to transmit wireless messages.

[0076] When the active pen is paired or connected with multiple touch screens, the system will assign wireless channels to each touch screen and the active pen. For the touch screen, wireless signals can be transmitted through the wireless channel corresponding to the active pen, while for the active pen, the active pen needs to communicate wirelessly with the touch screen through the wireless channel corresponding to each touch screen. Therefore, the active pen needs to know which touch screen it is currently using and use the wireless channel corresponding to the touch screen to send wireless messages to the touch screen. In this way, the wireless message can be accurately transmitted to the touch screen.

[0077] In this embodiment, the active pen sends a coding signal to the first touch screen, receives a wireless signal sent by the first touch screen through the wireless channel corresponding to the active pen, and identifies the first touch screen currently close to or in contact with it among multiple touch screens according to the identification information carried therein, thereby using the wireless channel corresponding to the first touch screen to send a wireless message to the first touch screen. The identification information is the identification information corresponding to the first touch screen, and the active pen identifies the first touch screen through the wireless signal sent by the first touch screen, and transmits the wireless message to the first touch screen, thereby achieving accurate transmission of the wireless message.

[0078] Figure 4 4 is a schematic flow chart of a wireless communication method 400 of an embodiment of the present application. The method can be executed by a first touch screen among multiple touch screens. The method is used for wireless communication between the first touch screen and an active pen. Here, the first touch screen is used as an example for description. The operations executed by other touch screens among the multiple touch screens can refer to the operations executed by the first touch screen. For the sake of brevity, no further description is given. Figure 4 As shown, method 400 may include some or all of the following steps.

[0079] In 410 , the first touch screen detects a coding signal sent by the active pen.

[0080] The coding signal is used by the first touch screen to determine the position information of the active pen on the first touch screen.

[0081] In 420, if the first touch screen detects the coding signal, the first touch screen sends a wireless signal to the active pen.

[0082] The wireless signal is transmitted through the wireless channel corresponding to the active pen and carries identification information of the first touch screen. The identification information of the first touch screen is used by the active pen to identify the first touch screen currently approaching or touching among multiple touch screens.

[0083] The identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

[0084] The identification information is specified by a communication protocol, for example, the communication protocol may be a Bluetooth or Wireless Fidelity (Wi-Fi) communication protocol.

[0085] In 430 , the first touch screen receives the wireless message sent by the active pen through the wireless channel corresponding to the first touch screen.

[0086] The wireless message includes pressure information generated by the active pen on the first touch screen.

[0087] In this embodiment, after the first touch screen detects the coding signal, it transmits it in a wireless message through the wireless channel corresponding to the first touch screen and carries its identification information, so that the active pen can identify the first touch screen among multiple touch screens according to the identification information.

[0088] After detecting the coding signal sent by the active pen, the first touch screen sends a wireless signal carrying identification information to the active pen through the wireless channel corresponding to the active pen. The active pen identifies the first touch screen according to the identification information and sends a wireless message to the first touch screen using the wireless channel corresponding to the first touch screen. The first touch screen receives the wireless message such as pressure information sent by the active pen through its corresponding wireless channel, and outputs a line in real time according to the coding signal and pressure information.

[0089] Optionally, the method 310 specifically includes: the active pen sends a coding signal to the first touch screen, the active pen and the first touch screen are within a preset distance, and the first touch screen receives the coding signal; or the active pen and the first touch screen are within a preset distance, and the active pen sends a coding signal to the first touch screen within a specific period of time after detecting an uplink signal sent by the first touch screen. The preset distance is less than or equal to 10 mm.

[0090] The uplink signal may also be referred to as an uplink command, which generally refers to a signal sent by the detection electrode of the touch screen to the active pen. Accordingly, the aforementioned method 410 specifically includes: the first touch screen and the active pen are within a preset distance, and the first touch screen detects a coding signal sent by the active pen; or the first touch screen sends an uplink signal to the active pen, the first touch screen and the active pen are within a preset distance, the active pen receives the uplink signal, and receives the coding signal sent by the active pen within a specific period of time after the first touch screen sends the uplink signal. Wherein, the preset distance is less than or equal to 10 mm.

[0091] Preferably, the preset distance is 5-10 mm. If the preset distance is set too close, it is easy to cause popping points on the touch screen. This distance can effectively suppress the popping point problem when the active pen is applied to the touch screen.

[0092] That is to say, the active pen can code the touch screen periodically, or can code based on the uplink signal sent by the touch screen.

[0093] Active pens can be divided into two categories. The first category is an active pen that periodically prints codes, such as Figure 5 As shown. This type of active pen periodically sends a coding signal to the touch screen, which is an interactive protocol without an uplink signal. The touch screen detects the coding signal based on the same period, and the coding signal is used for coordinate positioning of the touch screen. The touch screen can obtain coordinate information by periodically sampling according to the timing sequence.

[0094] The second category is an active pen that triggers coding with an uplink signal. Since some touch screens can send uplink signals to the active pen through detection electrodes, for this type of active pen, the active pen will send a coding signal to the touch screen only after detecting the uplink signal sent by the touch screen. The active pen parses the detected uplink signal to obtain the synchronization command information in the uplink signal, and starts sending the coding signal after a fixed delay based on the synchronization command information, so that the touch screen can calculate the position coordinates of the active pen. Accordingly, the touch screen starts detecting the coding signal after a fixed delay in sending the uplink signal, and based on the detected coding signal, sends a wireless signal carrying its identification information to the active pen through the wireless channel corresponding to the touch screen.

[0095] like Figure 6 As shown, taking a period T as an example, the touch screen sends an uplink signal, and the active pen detects the uplink signal. If the active pen successfully detects the uplink signal sent by the touch screen, the active pen sends a coding signal to the touch screen within a specific period after a fixed delay. The fixed delay can be determined based on the signal processing time of the active pen, which is used for the active pen to process the uplink signal and prepare the coding signal. The active pen continues to send the coding signal within the specific period.

[0096] While the active pen sends the coding signal, the pressure sensor in the active pen can detect the pressure of the active pen and send the pressure information through the wireless communication module. Alternatively, the active pen can also detect and send the pressure information of the active pen after sending the coding signal. The embodiment of the present application does not impose any limitation on the time of pressure detection. The time when the active pen sends the coding signal is based on the detection result of the active pen on the uplink signal, but the time of pressure detection may not be limited to the detection result of the uplink signal. The pressure detection may have its own timing, and the active pen may perform pressure detection based on, for example, a preset sampling frequency and sampling period.

[0097] Here, "coding" means "sending a coding signal", which can also be called a driving signal. The coding signal sent by the pen tip electrode can be, for example, a square wave, a sine wave or a triangle wave, and the actual frequency used can be, for example, between tens of kHz and hundreds of kHz.

[0098] The active pen and the touch screen interact with each other by wireless communication. The active pen can transmit wireless messages to the touch screen through the wireless communication module. The wireless message may include the aforementioned pressure information, or may include the pressure information and the key information of the active pen.

[0099] Here, the wireless communication between the active pen and the touch screen can be understood as the wireless communication between the active pen and the main control device of the touch screen, and the main control device can be, for example, an electronic device using the touch screen, such as a mobile phone, a tablet computer, etc. For example, the active pen sends a wireless message to the first touch screen, which can be the active pen sending the wireless message to the main control device of the touch screen, and the main control device of the touch screen conveys the wireless message to the touch screen; the first touch screen receives the wireless message sent by the active pen, which can be the first touch screen receiving the wireless message through its main control device.

[0100] The wireless communication may be, for example, Bluetooth communication such as Bluetooth Low Energy (BLE) or the like, or may be Wireless Fidelity (Wi-Fi) communication or the like.

[0101] The embodiments of the present application do not impose any limitation on the identification information, as long as it can uniquely identify the first touch screen or its corresponding wireless channel. For example, the identification information corresponding to the first touch screen may be the device identification corresponding to the first touch screen. The device identification corresponding to the first touch screen may be, for example, the identification of the first touch screen, and different touch screens may have different device identifications; or the device identification corresponding to the first touch screen may be the identification of the main control device to which the first touch screen is applied, and different main control devices may have different identifications. For another example, the identification information corresponding to the first touch screen may be the channel identification of the wireless channel corresponding to the first touch screen, and the system may allocate different wireless channels to different touch screens, and different wireless channels may have different channel identifications.

[0102] The wireless signal sent by the first touch screen includes a plurality of bits, and the plurality of bits include an identification area for indicating the identification information. Further, the plurality of bits may also include at least one of a check area, an auxiliary command area, and a command header area.

[0103] For example Figure 7 The wireless signal shown includes n bits, namely bit 1 to bit n. Each bit can represent a number. For binary, each bit can represent two numbers, 1 or 0. For ternary, each bit can represent three numbers. The following description takes binary as an example. The n bits can be divided into multiple partitions, each partition is used to represent different content. In other words, the n bits are divided into multiple fields, each field includes a number of bits. Figure 7 In the example, four partitions are taken, namely the verification area, auxiliary command area, identification area and command header area.

[0104] The verification area is used for the active pen to verify the uplink signal to ensure that the detected signal is a wireless signal from the touch screen. Only after the verification is successful can the wireless message be transmitted according to the information carried in the wireless signal.

[0105] The auxiliary command area is used to carry other auxiliary information, such as frequency hopping information.

[0106] The identification area is used to carry identification information corresponding to the touch screen, such as the device identification or channel identification corresponding to the touch screen. It can be agreed that when the identification area is a specific value, it means that no identification information is carried. For example, when all bits in the identification area are 0, it means that the wireless signal does not carry identification information.

[0107] The command header area includes a pressure request for indicating the first touch screen, and is the beginning of an identification command.

[0108] It should be understood that in the embodiment of the present application, except for the identification area, other partitions are not necessary.

[0109] Optionally, in 320, if the first touch screen detects a coding signal, the active pen receives a wireless signal from the first touch screen, including: when the first touch screen detects that the strength of the coding signal is greater than a first threshold and the number of coding signals is greater than a second threshold, the active pen receives the wireless signal sent by the first touch screen, wherein the wireless signal carries identification information of the first touch screen.

[0110] Since the positions of multiple touch screens may be very close, this may cause the active pen to send a coding signal to the first touch screen that is close to or in contact with it, and other touch screens adjacent to the first touch screen may also detect the coding signal. However, the signal strength of the coding signal detected by the first touch screen and other touch screens adjacent to it is different, and the signal strength of the coding signal detected by the first touch screen is the largest. Therefore, the first touch screen can determine whether the coding signal is the coding signal that the active pen expects to send to the first touch screen by judging the signal strength of the coding signal it detects. And when the signal strength of the coding signal is greater than the first threshold, it is identified as valid coding. If the number of valid coding signals is greater than the second threshold, its identification information is carried in its wireless signal. Of course, if the signal strength of the coding signal is less than the first threshold or the number of valid coding signals is less than the second threshold, the first touch screen will not carry the identification information in its wireless signal, wherein the first threshold and the second threshold are respectively greater than 0, and the size of the first threshold and the second threshold can be set as needed.

[0111] In this embodiment, the first touch screen sends a wireless signal to the active pen only when the strength of the coding signal detected by the first touch screen is greater than the first threshold and the number of times the coding signal is detected is greater than the second threshold. This is to ensure that the received coding signal is stable and prevent noise interference and the problem of popping dots.

[0112] For example Figure 8 A possible implementation of the method 300 shown is as follows: Figure 8 The process shown is performed by an active pen.

[0113] In 810, if the active pen switches from the first touch screen to a second touch screen among the multiple touch screens, the active pen sends a coding signal to the second touch screen.

[0114] In 820, the active pen receives a wireless signal sent by the second touch screen.

[0115] The wireless signal is transmitted through the wireless channel corresponding to the active pen and carries the identification information of the second touch screen.

[0116] In 830 , the active pen recognizes that the active pen switches from the first touch screen to the second touch screen based on the identification information of the second touch screen being different from the identification information of the first touch screen.

[0117] In 840, the active pen sends a wireless message to the second touch screen through the wireless channel corresponding to the second touch screen.

[0118] Since the identification information of the first touch screen is different from the identification information of the second touch screen, the active pen recognizes that the current touch screen has been switched by identifying the change in the identification information. The active pen identifies the touch screen to which pressure needs to be transmitted based on the identification information carried in the wireless signal sent by the touch screen, thereby enabling an active pen to quickly switch between multiple connected touch screens.

[0119] If the active pen identification information does not change, the active pen maintains the current wireless channel, that is, the active pen still uses the current wireless channel to send wireless messages.

[0120] The above wireless communication method between the active pen and the first touch screen is applicable to the wireless communication method between the active pen and the second touch screen. For example, the active pen sends a coding signal to the second touch screen, the active pen and the second touch screen are within a preset distance, and the second touch screen receives the coding signal; or the active pen and the second touch screen are within a preset distance, and the active pen sends a coding signal to the second touch screen within a specific period of time after detecting the uplink signal. The preset distance is less than or equal to 10mm. Preferably, the preset distance is 5-10mm. For another example, if the intensity of the coding signal detected by the second touch screen is greater than the first threshold and the number of coding signals is greater than the second threshold, the active pen receives the wireless signal sent by the second touch screen, wherein the wireless signal carries the identification information of the first touch screen.

[0121] Fig. 9 is a schematic diagram of a possible implementation of method 400, Fig. 9 The process shown can be executed by any one of a plurality of touch screens that can be used in conjunction with an active pen.

[0122] In 910, if the active pen switches from the first touch screen to a second touch screen among the multiple touch screens, the second touch screen detects the coding signal sent by the active pen.

[0123] In 920, if the second touch screen detects the coding signal, the second touch screen sends a wireless signal to the active pen.

[0124] The wireless signal is transmitted through the wireless channel corresponding to the active pen and carries the identification information of the second touch screen.

[0125] The identification information of the second touch screen is different from the identification information of the first touch screen, so that the active pen recognition is switched from the first touch screen to the second touch screen.

[0126] In 930, the second touch screen receives the wireless message sent by the active pen through the wireless channel corresponding to the second touch screen.

[0127] The above wireless communication method between the first touch screen and the active pen is applicable to the wireless communication method between the second touch screen and the active pen. For example, the active pen sends a coding signal to the second touch screen, the second touch screen and the active pen are within a preset distance, and the second touch screen receives the coding signal sent by the active pen; or the second touch screen sends an uplink signal to the active pen, the second touch screen and the active pen are within a preset distance, and within a specific period of time after the second touch screen sends the uplink signal, the second touch screen receives the coding signal sent by the active pen. Preferably, the preset distance is 5-10mm. For another example, the second touch screen sends a wireless signal carrying the identification information of the second touch screen to the active pen only when it detects that the strength of the coding signal is greater than the first threshold and the number of coding signals is greater than the second threshold.

[0128] Since different touch screens use different wireless channels, the touch screen carries its identification information in the wireless signal, so that the active pen can identify the touch screen currently in contact with or close to it through the identification information carried in the wireless signal, thereby using the wireless channel corresponding to the touch screen to send a wireless signal, and the touch screen uses its corresponding wireless channel to receive the wireless message.

[0129] Reference now Fig.10 , Fig.10 In FIG. 1 , multiple touch screens are shown, and the active pen can establish wireless connection with the multiple touch screens and can write on the multiple touch screens. Each touch screen has its own identification, i.e., number, for example Fig.10 The identifier "1" to the identifier "N" shown in . In the embodiment of the present application, the active pen can switch among the N touch screens, for example, switching from the top of touch screen 1 to the top of touch screen 2. Assuming that the active pen is above touch screen 1 and is used to write on touch screen 1, at this time, the signal strength of the coding signal sent by the active pen detected by touch screen 1 will be greater than the first threshold. When a coding signal greater than the first threshold is detected and the number of times is greater than the second threshold, the coding signal is stable at this time, indicating that touch screen 1 detects the coding signal, and the wireless signal sent by touch screen 1 to the active pen carries the identification information corresponding to touch screen 1, and requests the active pen to send pressure information to touch screen 1. When the active pen detects the identification information corresponding to touch screen 1, it knows that it needs to use the wireless channel corresponding to touch screen 1 to send the pressure information it detects.

[0130] When the active pen moves from the top of the touch screen 1 to the top of the touch screen 2 to write, the signal strength of the coding signal detected by the touch screen 1 and the number of valid coding signals will decrease, so that the signal strength of the coding signal decreases below the first threshold or the number of valid coding signals decreases below the second threshold. Since the coding signal is unstable, the touch screen 1 will not send a wireless signal carrying the identification information corresponding to the touch screen 1 to the active pen. However, the active pen is close to the touch screen 2, so the signal strength of the coding signal detected by the touch screen 2 increases, thereby exceeding the first threshold. When the number of coding signals greater than the first threshold is detected is greater than the second threshold, the coding signal is stable at this time, indicating that the touch screen 2 has detected the coding signal. At this time, the wireless signal sent by the touch screen 2 to the active pen carries the identification information corresponding to the touch screen 2. After the identification information in the wireless signal detected by the active pen changes from the identification information corresponding to the touch screen 1 to the identification information corresponding to the touch screen 2, it is known that it is necessary to switch to the wireless channel corresponding to the touch screen 2, so as to use the wireless channel corresponding to the touch screen 2 to send pressure information.

[0131] It can be seen that by adopting the method of the embodiment of the present application, the active pen can switch the wireless channel according to the real-time usage situation and transmit wireless messages to a specific device in a targeted manner, thereby achieving seamless switching between different touch screens and completing the accurate transmission of wireless messages.

[0132] The present application also provides an active pen for wireless communication with multiple touch screens. The multiple touch screens and the active pen correspond to multiple wireless channels, respectively, wherein each wireless channel is used for wireless communication between the corresponding touch screen and the active pen. Fig.11 As shown, the active pen 1100 includes:

[0133] The processing module 1110 is used to send a coding signal to the first touch screen, where the coding signal is used by the first touch screen to determine the position information of the active pen on the first touch screen;

[0134] The processing module is used to receive a wireless signal sent by the first touch screen. The wireless signal is transmitted through a wireless channel corresponding to the active pen and carries identification information of the first touch screen.

[0135] The processing module 1110 is further configured to identify, according to the identification information of the first touch screen, a first touch screen that the active pen is currently close to or in contact with among the multiple touch screens;

[0136] The communication module 1120 is configured to send a wireless message to the first touch screen via a wireless channel corresponding to the first touch screen.

[0137] Therefore, the active pen identifies the touch screen it is currently close to or in contact with among multiple touch screens by sending a coding signal and receiving a wireless signal carrying identification information sent by the touch screen, and uses the wireless channel corresponding to the touch screen to send a wireless message to the touch screen, thereby enabling accurate transmission of wireless messages between the active pen and multiple touch screens.

[0138] Optionally, the identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

[0139] Optionally, the wireless message includes pressure information generated by the active pen on the first touch screen.

[0140] Optionally, the processing module 1110 is specifically used to: send a coding signal to the first touch screen, and when the active pen and the first touch screen are within a preset distance, the first touch screen receives the coding signal; wherein the preset distance is less than or equal to 10 mm.

[0141] Optionally, the processing module 1110 is specifically used to: when the active pen is within a preset distance from the first touch screen, send a coding signal to the first touch screen within a specific time period after detecting an uplink signal; wherein the preset distance is less than or equal to 10 mm.

[0142] Optionally, the preset distance is 5-10 mm.

[0143] Optionally, the processing module is also used to: receive a wireless signal sent by the first touch screen when the first touch screen detects that the strength of the coding signal is greater than a first threshold and the number of times the coding signal is detected is greater than a second threshold; wherein the first threshold and the second threshold are respectively greater than 0.

[0144] Optionally, the processing module is used to: if the active pen switches from the first touch screen to the second touch screen among the multiple touch screens, send a coding signal to the second touch screen; if the second touch screen detects the coding signal, the processing module is used to receive a wireless signal sent by the second touch screen, and the wireless signal is transmitted through the wireless channel corresponding to the active pen and carries the identification information of the second touch screen; the processing module is also used to identify that the active pen switches from the first touch screen to the second touch screen based on the identification information of the second touch screen being different from the identification information of the first touch screen; and the communication module is used to send a wireless message to the second touch screen through the wireless channel corresponding to the second touch screen.

[0145] Optionally, the wireless signal includes a plurality of bits, and the plurality of bits includes an identification area for representing the identification information.

[0146] Optionally, the plurality of bits further include at least one of a check area, an auxiliary command area and a command header area.

[0147] Optionally, the command header area is used to indicate a pressure request of the first touch screen.

[0148] Optionally, the wireless communication includes Bluetooth communication.

[0149] It should be understood that Fig.11 The above and other operations and / or functions of each module of the active pen 1100 of the embodiment of the present application are respectively to achieve Figure 3 The corresponding process executed by the active pen in the wireless communication method will not be repeated here for the sake of brevity.

[0150] The present application also provides a touch screen for wireless communication with an active pen. The multiple touch screens and active pens correspond to multiple wireless channels, respectively, wherein each wireless channel is used for wireless communication between the corresponding touch screen and the active pen. Fig.12 As shown, the touch screen 1200 includes:

[0151] The processing module 1210 is used to detect the coding signal sent by the active pen, and the coding signal is used by the first touch screen to determine the position information of the active pen on the first touch screen;

[0152] The processing module is further configured to, if a coding signal is detected, send a wireless signal to the active pen, wherein the wireless signal is transmitted through a wireless channel corresponding to the active pen and carries identification information of the first touch screen, wherein the identification information of the first touch screen is used by the active pen to identify the first touch screen currently approaching or in contact with the multiple touch screens;

[0153] The communication module 1220 is used to receive a wireless message sent by the active pen through the wireless channel corresponding to the first touch screen.

[0154] Since different touch screens use different wireless channels, the touch screen carries its identification information in the wireless signal, so that the active pen can identify the touch screen that is currently in contact with or close to it through the identification information carried in the wireless signal, and use the wireless channel corresponding to the touch screen to send wireless messages, thereby achieving accurate transmission of wireless messages between the active pen and multiple touch screens.

[0155] Optionally, the identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

[0156] Optionally, the wireless message includes pressure information generated by the active pen on the first touch screen.

[0157] Optionally, the processing module 1210 is specifically used to: if the first touch screen and the active pen are within a preset distance, receive a coding signal sent by the active pen; wherein the preset distance is less than or equal to 10 mm.

[0158] Optionally, the processing module 1210 is specifically used to: send an uplink signal to the active pen, if the first touch screen and the active pen are within a preset distance, the active pen receives the uplink signal within a specific time period after the first touch screen sends the uplink signal, and receives the coding signal sent by the active pen; wherein the preset distance is less than or equal to 10 mm.

[0159] Optionally, the preset distance is 5-10 mm.

[0160] Optionally, the processing module 1210 is also used to: send a wireless signal to the active pen when the intensity of the coding signal detected by the first touch screen is greater than a first threshold and the number of coding signals is greater than a second threshold; wherein the first threshold and the second threshold are respectively greater than 0.

[0161] Optionally, the processing module is used to: if the active pen switches from the first touch screen to the second touch screen among the multiple touch screens, detect a coding signal sent by the active pen; if the coding signal is detected, the processing module is used to send a wireless signal to the active pen, the wireless signal is transmitted through the wireless channel corresponding to the active pen, and carries identification information of the second touch screen, the identification information of the second touch screen is different from the identification information of the first touch screen, so that the active pen can recognize the switch from the first touch screen to the second touch screen; and the communication module is used to receive the wireless message sent by the active pen through the wireless channel corresponding to the second touch screen.

[0162] Optionally, the wireless signal includes a plurality of bits, and the plurality of bits includes an identification area for representing the identification information.

[0163] Optionally, the plurality of bits further include at least one of a check area, an auxiliary command area and a command header area.

[0164] Optionally, the command header area is used to indicate a pressure request of the first touch screen.

[0165] Optionally, the wireless communication includes Bluetooth communication.

[0166] It should be understood that Fig.12 The above and other operations and / or functions of the various modules of the touch screen 1200 of the embodiment of the present application are respectively to achieve Figure 4The corresponding process executed by the first touch screen in the wireless communication method in the embodiment of the present invention will not be described in detail here for the sake of brevity.

[0167] An embodiment of the present application provides an active pen chip, which is used for an active pen to perform any of the wireless communication methods described above.

[0168] An embodiment of the present application provides a touch control chip, which is used for a touch screen to perform any of the above-mentioned wireless communication methods.

[0169] The present application also provides a communication device. Fig.13 As shown, the communication device 1300 is used to implement the method described in the above method embodiment. Fig.13 A dashed box in the box indicates that the unit or module is optional.

[0170] The communication device 1300 includes at least one processor 1301. The processor 1301 can support the communication device 1300 to implement Figures 3 to 9 The method in the corresponding method embodiment. The processor 1301 can be a general-purpose processor or a special-purpose processor. For example, the processor 1301 can be a central processing unit (CPU), a micro-programmed control unit (MCU), etc. The processor 1301 can be used to control the communication device 1300, execute the software program, and process the data of the software program. The communication device 1300 can also include a communication module 1305 to realize the input and output of signals.

[0171] For example, the communication device 1300 may be a chip, and the communication module 1305 may be an input circuit and / or output circuit of the chip; or, the communication module 1305 may be a communication interface of the chip, and the chip may be a component of an active pen, a touch screen or other wireless communication device.

[0172] For another example, the communication device 1300 may be an active pen, a touch screen, or an electronic device using the touch screen, and the communication module 1305 may be a transceiver of the active pen, the touch screen, or the electronic device; or, the communication module 1305 may be a transceiver circuit of the active pen, the touch screen, or the electronic device.

[0173] The communication device 1300 may include at least one memory 1302, on which a program 1304 is stored. The program 1304 can be executed by the processor 1301 to generate instructions 1303, so that the processor 1301 performs the method described in the above method embodiment according to the instructions 1303. Optionally, data may also be stored in the memory 1302. Optionally, the processor 1301 may also read the data stored in the memory 1302, and the data may be stored at the same storage address as the program 1304, or the data may be stored at a different storage address from the program 1304.

[0174] The processor 1301 and the memory 1302 may be provided separately or integrated together.

[0175] The communication device 1300 may further include an antenna 1306. The communication module 1305 is used to implement the transceiver function of the communication device 1300 through the antenna 1306.

[0176] The specific manner in which the processor 1301 executes the communication method may refer to the relevant description in the method embodiment.

[0177] It should be understood that each step of the above method embodiment can be completed by a hardware-based logic circuit or a software-based instruction in the processor 1301. The processor 1301 can be a CPU, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, such as discrete gates, transistor logic devices, or discrete hardware components.

[0178] The present application also provides a computer program product, which, when executed by the processor 1301, implements the method described in any method embodiment of the present application.

[0179] The computer program product may be stored in the memory 1302 , for example, a program 1304 , which is converted into an executable target file that can be executed by the processor 1301 after preprocessing, compiling, assembling, linking and other processing processes.

[0180] The present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a computer, the method described in any method embodiment of the present application is implemented. The computer program can be a high-level language program or an executable target program.

[0181] The computer-readable storage medium is, for example, a memory 1302. The memory 1302 may be a volatile memory or a nonvolatile memory, or the memory 1302 may include both a volatile memory and a nonvolatile memory. Among them, the nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus random access memory (Direct Rambus RAM, DR RAM).

[0182] An embodiment of the present application further provides an electronic device, including the touch screen in the various embodiments of the present application described above.

[0183] An embodiment of the present application further provides a communication system, including the active pen and the electronic device in the various embodiments of the present application described above.

[0184] 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 arbitrarily combined with each other, and the technical solution obtained after the combination should also fall within the protection scope of this application.

[0185] The systems, devices and methods disclosed in the embodiments of the present application may be implemented in other ways. For example, some features of the method embodiments described above may be ignored or not performed. The device embodiments described above are merely schematic, and the division of units is merely a logical function division. There may be other division methods in actual implementation, and multiple units or components may be combined or 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 may include electrical, mechanical or other forms of connection.

[0186] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described devices and equipment and the technical effects produced can refer to the corresponding processes and technical effects in the aforementioned method embodiments, and will not be repeated here.

[0187] 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 to limit the scope of the embodiments of the present application. Those skilled in the art can make various improvements and modifications based on the above embodiments, and these improvements or modifications all fall within the scope of protection of the present application.

[0188] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An active pen chip, characterized in that: Applied to wireless communication between an active pen and multiple touch screens, the multiple touch screens and the active pen correspond to multiple wireless channels respectively, wherein each wireless channel is used for wireless communication between the corresponding touch screen and the active pen, and the active pen chip is used to execute a wireless communication method, the method comprising: Receiving a wireless signal sent by the first touch screen, wherein the wireless signal is transmitted through the wireless channel corresponding to the active pen and carries identification information of the first touch screen; identifying, according to the identification information of the first touch screen, the first touch screen that the active pen is currently close to or in contact with among the multiple touch screens; Sending a wireless message to the first touch screen through a wireless channel corresponding to the first touch screen; If the active pen switches from the first touch screen to a second touch screen among the multiple touch screens, a coding signal is sent to the second touch screen; receiving a wireless signal sent by the second touch screen, wherein the wireless signal is transmitted through a wireless channel corresponding to the active pen and carries identification information of the second touch screen; identifying that the active pen switches from the first touch screen to the second touch screen based on the identification information of the second touch screen being different from the identification information of the first touch screen; and A wireless message is sent to the second touch screen through the wireless channel corresponding to the second touch screen.

2. The active pen chip according to claim 1, characterized in that: The identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

3. The active pen chip according to claim 1, characterized in that: The wireless message includes pressure information generated by the active pen on the first touch screen.

4. The active pen chip according to claim 1, characterized in that: Sending a coding signal to the first touch screen includes: Sending a coding signal to the first touch screen, the active pen and the first touch screen are within a preset distance, so that the first touch screen receives the coding signal; Wherein, the preset distance is less than or equal to 10 mm.

5. The active pen chip according to claim 3 or 4, characterized in that: Sending a coding signal to the first touch screen includes: Detecting an uplink signal sent by the first touch screen, the active pen and the first touch screen are within a preset distance, detecting the uplink signal, and sending a coding signal to the first touch screen within a specific period of time after detecting the uplink signal; Wherein, the preset distance is less than or equal to 10 mm.

6. The active pen chip according to claim 5, characterized in that: The wireless communication includes Bluetooth communication; and the preset distance is 5-10 mm.

7. The active pen chip according to claim 1, characterized in that: Receiving a wireless signal sent by the first touch screen includes: If the first touch screen detects that the strength of the coding signal is greater than a first threshold and the number of times the coding signal is detected is greater than a second threshold, receiving a wireless signal carrying identification information of the first touch screen sent by the first touch screen; The first threshold and the second threshold are respectively greater than 0.

8. The active pen chip according to claim 1, characterized in that: The wireless signal includes a plurality of bits, the plurality of bits including an identification area for representing the identification information; the plurality of bits also include at least one of a check area, an auxiliary command area and a command header area; the command header area is used to represent a pressure request for the first touch screen.

9. A touch chip, characterized in that: The touch control chip is used to execute a wireless communication method, and the method includes: If the active pen switches from the first touch screen to the second touch screen among the multiple touch screens, detecting a coding signal sent by the active pen; If the second touch screen detects the coding signal, a wireless signal is sent to the active pen, the wireless signal is transmitted through the wireless channel corresponding to the active pen, and carries the identification information of the second touch screen, the identification information of the second touch screen is different from the identification information of the first touch screen, so that the active pen identification is switched from the first touch screen to the second touch screen; and The wireless message sent by the active pen is received through the wireless channel corresponding to the second touch screen.

10. The touch control chip according to claim 9, characterized in that: The identification information is a device identification corresponding to the first touch screen or a channel identification of a wireless channel corresponding to the first touch screen.

11. The touch control chip according to claim 9, characterized in that: The wireless message includes pressure information generated by the active pen on the first touch screen.

12. The touch control chip according to claim 10 or 11, characterized in that: The wireless communication includes Bluetooth communication.

13. The touch control chip according to claim 9, characterized in that: The wireless signal includes a plurality of bits, the plurality of bits including an identification area for representing the identification information; the plurality of bits also include at least one of a check area, an auxiliary command area and a command header area; and the command header area is used to represent a pressure request for the first touch screen.

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