Active capacitive pen, communication control method thereof, controller, and control system

Abstract

The application discloses an active capacitive pen, a communication control method, a controller and a control system thereof. The capacitive pen comprises a capacitive pen shell, an electric control board, a micro control unit, a path switching circuit, a first communication module, a second communication module and a shielding ring. The micro control unit is used for outputting and receiving control signals, and controlling the working state of the second communication module, so that the second communication module outputs or receives communication signals, and can be multiplexed with the shielding ring as a shielding circuit to protect the communication of the first communication module. The first communication module is used for transmitting communication signals to a capacitive touch screen. The application multiplexes the second communication module, so that the second communication module and the shielding ring are in the same working state, and the possibility of short circuit and failure of the active capacitive pen due to structure error is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of capacitive touch, in particular to an active capacitive stylus, a communication control method thereof, a controller and a control system. BACKGROUND

[0002] With the progress of technology, intelligent devices are gradually popularized in work, and active capacitive styluses have become an indispensable part when using capacitive touch screens for conference recording, artistic creation and plane drawing.

[0003] The active capacitive stylus in the prior art is designed to be relatively long and slender, and the circuit structure inside the active capacitive stylus is also arranged compactly. In artistic creation such as painting and calligraphy, the active capacitive stylus often needs to have the function of recognizing the user's inclined handwriting. To realize the function of inclined writing of the active capacitive stylus, two groups of communication modules are usually needed for positioning, so the stylus tip is usually composed of three parts, of which the stylus tip and the conical shell have one group of communication modules respectively, and there is a shielding module between them. However, the existing active capacitive stylus often has the problems of loose and falling of the circuit during long-term use, and the communication module at the conical shell is easy to directly contact the circuit on the shielding module during use, causing short circuit failure, and thus problems such as writing deviation, inaccurate positioning and inability to recognize occur. SUMMARY

[0004] The main purpose of the present application is to provide an active capacitive stylus, a communication control method thereof, a controller and a control system, which aims to solve the problem that the active capacitive stylus is easy to have short circuit due to the narrow internal space and the close structure of the communication module and the shielding module.

[0005] To achieve the above-mentioned purpose, the present application provides an active capacitive stylus, which comprises:

[0006] a capacitive stylus shell;

[0007] an electric control board arranged in the capacitive stylus shell;

[0008] a shielding ring arranged in the capacitive stylus shell and close to one end of the capacitive stylus shell;

[0009] a micro control unit, a path switching circuit, a first communication module and a second communication module arranged on the electric control board; two communication ends of the micro control unit are connected with the first communication module and a first switching end of the path switching circuit respectively; a control end of the micro control unit is connected with a controlled end of the path switching circuit; a second switching end of the path switching circuit is grounded, a common end of the path switching circuit is connected with a first end of the second communication module, and a second end of the second communication module is connected with the shielding ring; wherein,

[0010] The micro control unit is configured to output a path switching signal, output a first communication signal to the first communication module, output a second communication signal to the second communication module, or receive the second communication signal output by the second communication module.

[0011] The path switching circuit is configured to connect the second communication module with the micro control unit or connect the second communication module with the ground according to the path switching signal output by the micro control unit.

[0012] Optionally, the micro control unit is specifically configured to periodically output the path switching signal to control the path switching circuit to switch the second communication module to connect with the micro control unit and the ground alternately.

[0013] Optionally, the micro control unit is specifically configured to control the path switching circuit to connect the second communication module with the ground when outputting the first communication signal to the first communication module, so as to control the shielding ring to be grounded through the second communication module and the path switching circuit alternately.

[0014] Optionally, the first communication module and the second communication module are both transmitting modules.

[0015] The second communication module comprises a second transmitting circuit and an annular threaded coil, and the annular threaded coil is arranged around one end of the capacitive pen shell close to the shielding ring.

[0016] The input end of the second transmitting circuit is connected with the common end of the path switching circuit, and the output end of the second transmitting circuit is connected with the annular threaded coil and the shielding ring.

[0017] Optionally, the first communication module is a transmitting module, and the second communication module is a receiving module.

[0018] The second communication module comprises a receiving circuit and an annular threaded coil, and the annular threaded coil is arranged around one end of the capacitive pen shell close to the shielding ring.

[0019] The input end of the receiving circuit is connected with the annular threaded coil and the shielding ring, and the output end of the receiving circuit is connected with the common end of the path switching circuit.

[0020] Optionally, the first communication module is a transmitting module.

[0021] The first communication module comprises a first transmitting circuit and a probe, the probe is arranged at one end of the capacitive pen shell close to the shielding ring, and part of the probe is arranged inside the capacitive pen shell and the other part is arranged outside the capacitive pen shell.

[0022] The input end of the first transmitting circuit is connected with the first communication end of the micro control unit, and the output end of the first transmitting circuit is connected with one end of the probe inside the capacitive pen shell.

[0023] The application further provides a communication control method of the active capacitive pen, which is applied to the active capacitive pen as described above, and the active capacitive pen comprises a micro control unit, a path switching circuit, a first communication module and a second communication module.

[0024] When the micro control unit outputs a communication signal to the first communication module, the path switching circuit is controlled to connect the second communication module with the ground, so as to control the shielding ring to be grounded through the second communication module and the path switching circuit in turn.

[0025] When the micro control unit outputs a communication signal to the second communication module or receives a communication signal transmitted by the second communication module, the path switching circuit is controlled to connect the second communication module with the micro control unit.

[0026] The application further provides a communication controller of the active capacitive pen, which comprises a memory and a processor, and the memory stores a communication control program of the active capacitive pen.

[0027] The application further provides a mobile terminal control system, which comprises a mobile terminal and the active capacitive pen as described above.

[0028] The application combines and multiplexes the shielding ring and the second communication module by arranging the path switching circuit, prevents the shielding ring from being directly grounded, and makes the shielding ring and the second communication module in the same working state, so that the second communication module is controlled by the path switching circuit to be in a communication state or a shielding state, and the second communication module will not be short-circuited and fail due to the shielding ring when the second communication module is in communication. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in these drawings without any creative effort.

[0030] Figure 1 Structure schematic diagram of an embodiment of the active capacitive pen of the present application;

[0031] Figure 2 Structure schematic diagram of an embodiment of the active capacitive pen of the present application;

[0032] Figure 3 Circuit structure schematic diagram of an embodiment of the active capacitive pen of the present application;

[0033] Figure 4 Flowchart schematic diagram of an embodiment of the communication control method of the active capacitive pen of the present application.

[0034] Explanation of the reference signs:

[0035] Reference Name Reference Name 10 Capacitive stylus housing 20 Electronic control board 30 Shielding ring 40 Micro control unit 50 Path switching circuit 60 First communication module 70 Second communication module 6010 First transmission circuit 6020 Probe 7010 Second transmission circuit 7020 Annular threaded coil 7030 Reception circuit

[0036] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort fall within the protection scope of the present application.

[0038] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0039] The application provides an active capacitive pen which is mainly applied to smart devices with capacitive touch screens such as smart tablets used in daily life and digital tablets used in professional drawing. The capacitive touch screen technology works by using the current induction of human body. The capacitive touch screen is a four-layer composite glass screen, the inner surface and the interlayer of which are coated with an ITO layer, and the outermost layer is a thin layer of silica glass protective layer. The interlayer ITO layer serves as a working surface, four electrodes are led out on the four corners, and the inner ITO layer serves as a shielding layer to ensure a good working environment. When a finger touches the metal layer, a coupling capacitor is formed between the user and the surface of the touch screen due to the human body electric field. For high-frequency current, the capacitor is a direct conductor, so the finger absorbs a very small current from the contact point. The current flowing through the four electrodes is proportional to the distance from the finger to the four corners, and the controller calculates the position of the touch point by accurately calculating the proportion of the four currents.

[0040] Correspondingly, the active capacitive pen is based on the structure of the mutual capacitive touch screen, and a sensor is arranged on the pen tip of the active capacitive pen to actively detect the signal on the touch screen like an oscilloscope probe, and couple the signal to the internal processing unit of the active capacitive pen. In order to be more accurate, the pen tip of the active capacitive pen is usually designed to be sharp. Since the touch screen is easily damaged by sharp objects, the pen tip of the active capacitive pen is usually wrapped with silica gel material. As a smart product of the pen, the appearance of the active capacitive pen is similar to that of an ordinary pen, that is, the pen barrel is long and thin, and the pen tip is conical, which is convenient for the staff to hold and more intuitive to understand the position contacted by the pen tip.

[0041] Further, when the active capacitive pen needs to realize some special drawing effects such as spraying and spraying, the special drawing effect can be realized by the angle between the active capacitive pen and the tablet during use, that is, the inclination angle of the active capacitive pen. In the prior art, the active capacitive pen is usually designed to be long and thin due to the use requirement, so the circuit structure inside the active capacitive pen is also arranged compactly. However, after long-term use, the active capacitive pen will loosen, and the working circuit will be easily in contact with the structure ground to cause failure, thereby causing problems such as contact failure and writing deviation of the active capacitive pen.

[0042] To solve the above problems, refer to Figures 1 to 3 In an embodiment of the application, the active capacitive pen comprises:

[0043] A capacitive pen shell 10;

[0044] An electric control board 20 arranged in the capacitive pen shell 10;

[0045] The shielding ring 30 is arranged in the capacitive pen shell 10 and close to one end of the capacitive pen shell 10;

[0046] The micro control unit 40, the path switching circuit 50, the first communication module 60, and the second communication module 70 are arranged on the electric control board 20; two communication ends of the micro control unit 40 are connected with the first communication module 60 and the first switching end of the path switching circuit 50 respectively; the control end of the micro control unit 40 is connected with the controlled end of the path switching circuit 50; the second switching end of the path switching circuit 50 is grounded, the common end of the path switching circuit 50 is connected with the first end of the second communication module 70, and the second end of the second communication module 70 is connected with the shielding ring 30; wherein,

[0047] The micro control unit 40 is used for outputting a path switching signal, outputting a first communication signal to the first communication module 60, outputting a second communication signal to the second communication module 70, or receiving the second communication signal output by the second communication module 70;

[0048] The path switching circuit 50 is used for connecting the second communication module 70 with the micro control unit 40 or connecting the second communication module 70 with the ground according to the path switching signal output by the micro control unit 40.

[0049] It can be understood that the capacitive pen shell 10 is the main body of the active capacitive pen, which is the main structure for carrying all other electronic components, the outside of which is convenient for holding by hand, and the outside is preferably of frosted material, and the inside is hollow and has insulation performance. Further, the electric control board 20 is the main carrier of the circuit structure of the active capacitive pen, which is bolted in the internal space of the capacitive pen shell 10. The fixed position of the embodiment is preferably close to the center of gravity of the capacitive pen shell 10. The electric control board 20 can be a single-sided board / double-sided board / multi-layer board. The electric control board 20 of the embodiment is preferably a single-sided board. In the case of normal operation of the active capacitive pen, the electric control board 20 provides power supply for the electronic elements arranged thereon, and stops power supply when the active capacitive pen stops working.

[0050] In the embodiment, the shielding ring 30 can be a hook-woven net with polyester multifilament outside and a layer of tinned copper wire inside, which has good shielding performance and can play a grounding and protection role. The shielding ring 30 can also be a ferrite magnetic ring suitable for the communication frequency of the active capacitive pen, which can suppress interference signals of non-communication frequencies. The shielding ring 30 is fixed at the pen tip of the active capacitive pen, located between the first communication module 60 and the second communication module 70, and surrounds the first communication module.

[0051] In this embodiment, the micro control unit 40 can be implemented by a single chip microcomputer, a DSP, an FPGA, or the like. The micro control unit 40 can output a corresponding control signal according to the working timing of the capacitive pen to control other elements to work normally.

[0052] With reference to Figure 3 , Figure 3 FIG. 1 is a schematic diagram of an embodiment of a circuit structure of an active capacitive pen. In this embodiment, the path switching circuit 50 can be implemented by an analog switch. The analog switch is turned on according to the control signal (GPIO1, GPIO2) of high / low level (1 / 0) output by the micro control unit 40 to connect a corresponding path. For example, when GPIO1 and GPIO2 are both high level (1), the analog switch connects the second communication module 70 and the micro control unit 40, and at this time the micro control unit 40 transmits the second communication signal through the second communication module 70. When GPIO1 and GPIO2 are both low level (0), the analog switch connects the second communication module 70 and the ground, and at this time the shielding ring 30 is connected to the ground through the second communication module 70. Of course, in other embodiments, different paths can be switched when the control signals GPIO1 and GPIO2 are in other level states, which will not be described here.

[0053] When the path switching circuit 50 is connected to the common end and the second switching end, the shielding ring 30 is grounded through the path switching circuit 50, and at this time the micro control unit outputs the first communication signal to the first communication module 60, and the first communication module 60 outputs the first communication signal to the external terminal. Since the shielding ring 30 is grounded through the path switching circuit 50 at this time, the shielding ring 30 shields and protects the first communication module 60 to reduce the electromagnetic interference of the first communication module 60 from the surrounding environment. When the path switching circuit 50 is connected to the common end and the first switching end, the micro control unit 40 outputs the second communication signal to the second communication module 60, and the second communication module 60 outputs the second communication signal to the external terminal, or the second communication module 60 receives the second communication signal output by the external terminal and outputs it to the micro control unit 40, so that the micro control unit 40 receives the second communication signal sent by the external terminal. Since the shielding ring 30 and the second communication module 70 are in the same working state, when the micro control unit 40 outputs the second communication signal to the second communication module 70, the shielding ring 30 is not grounded, and the shielding ring 30 will not be short-circuited and disabled due to the error touch of the second communication module 70. In this way, by setting the path switching circuit 50, the shielding ring 30 reduces the possibility of short-circuit failure caused by the error touch of the second communication module 70 on the basis of protecting the first communication module 60.

[0054] The micro control unit 40 outputs the first communication signal to the touch screen through the first communication module 60, and the micro control unit 40 outputs the second communication signal to the touch screen through the path switching circuit 50 and the second communication module 70, of course, in other embodiments, the second communication module 70 can also receive the second communication signal transmission to the micro control unit 40, which is not limited here, the touch screen can be a capacitive touch screen such as a mobile phone / tablet / iPad / digitizer, and the touch screen in the embodiment is preferably a digitizer. The touch screen receives the first communication signal and the second communication signal, and the falling point and the tilt angle of the active capacitive pen are obtained by operating the two communication signals.

[0055] The second communication module 70 transmits the second communication signal obtained from the touch screen to the path switching circuit 50, and transmits it to the micro control unit 40 through the path switching circuit 50, and the tilt angle of the active capacitive pen is obtained by operating the micro control unit 40. The first communication signal containing the tilt angle information is output, and the output is output to the touch screen through the first communication module. The touch screen identifies the first communication signal to obtain the falling point and the tilt angle of the active capacitive pen.

[0056] The present application sets the path switching circuit 50, combines and multiplexes the shielding ring 30 and the second communication module 70, and the shielding ring 30 does not need to be directly grounded, and the shielding ring 30 and the second communication module 70 are in the same working state. The combination is controlled by the path switching circuit 50 to be in a communication state or a shielding state, so that the second communication module 70 does not short circuit and malfunction due to the second communication module 70 touching the shielding ring 30 by mistake when communicating. When the first communication module 60 is in a communication state, the shielding ring 30 can also be in a shielding state to protect its communication. The shielding ring 30 and the second communication module 70 are directly connected in the present application, and when the first communication module 60 transmits the first communication signal, the shielding ring 30 is grounded through the second communication module 70 and the path switching circuit 50. The first communication module 60 is shielded and protected, and at this time the second communication module 70 does not transmit the second communication signal, so the grounding will not affect the normal use of the second communication module 70. When the second communication module 60 transmits the second communication signal, the shielding ring 30 and the second communication module 70 and the path switching circuit 50 form a communication path for the second communication signal, and the second communication signal is transmitted. At this time, since the shielding ring 30 is not grounded, the second communication module 70 will not be at risk of short circuiting by grounding.

[0057] Reference Figures 1 to 3 In an embodiment, the micro control unit 40 periodically outputs a path switching signal to control the path switching circuit 50 to switch the second communication module 70 to communicate with the micro control unit 40 or the ground in turn.

[0058] In this embodiment, in each complete sampling period of the touch screen, a first communication signal is output for a period of time, and the micro control unit 40 outputs a corresponding path switching signal to the path switching circuit 50, so that the path switching circuit 50 switches its communication path to control the second communication module 70 to be in communication. Since the shielding ring 30 is connected to the second communication module 70, the shielding ring 30 can be connected to the ground through the second communication module 70 and the path switching circuit 50. At this time, the first communication module 70 outputs the first communication signal output by the micro control unit 40 to the external terminal, and the first communication module 70 completes signal transmission under the shielding effect of the shielding ring 30. In another period of time, a second communication signal is output, and the micro control unit 40 outputs a corresponding path switching signal to the path switching circuit 50, so that the path switching circuit 50 switches its communication path to control the second communication module 70 to be in communication with the micro control unit 40. At this time, the second communication module 70 outputs the second communication signal output by the micro control unit 40 to the external terminal. Thus, in each complete sampling period, the first communication module 60 and the second communication module 70 work in time division mode, ensuring complete communication signal transmission while the shielding ring 30 also protects the first communication module 60 from interference. At the same time, in the process of outputting the second communication signal output by the micro control unit 40 to the external terminal by the second communication module 70, since the shielding ring 30 is directly connected to the second communication module 70, and the shielding ring 30 is not grounded at this time, it will not be short-circuited and disabled due to the second communication module 70 being touched by mistake.

[0059] Referring to Figures 1 to 3 In an embodiment, the first communication module 60 is a transmission module TX1, and the second communication module 70 is a transmission module TX2.

[0060] The second communication module 70 includes a second transmission circuit 7010 and a ring-shaped threaded coil 7020, and the ring-shaped threaded coil 7020 is arranged around one end of the capacitive pen housing 10 close to the shielding ring 30.

[0061] The input end of the second transmission circuit 7010 is connected to the common end of the path switching circuit 50, and the output end of the second transmission circuit 7010 is connected to the ring-shaped threaded coil 7020 and the shielding ring 30.

[0062] In the embodiment, the annular thread coil 7020 has a constant number of turns and a conical shape that matches the shape of the active capacitive pen tip. When a second communication signal is transmitted from the common terminal of the path switching circuit 50, the second communication signal is transmitted to the annular thread coil 7020 through the second transmitting circuit 7010. Since the active capacitive pen is tilted when in use, the annular thread coil 7020 has a coil with any number of turns that contacts the touch screen, thereby forming a contact surface with a corresponding area. The touch screen identifies the contact surface formed by the corresponding signal to determine the tilt angle of the active capacitive pen. In the embodiment, the TX1 and TX2 two-way transmitting modules TX2 are used to multiplex the transmitting module TX2, and the working condition of TX2 is changed through a software algorithm. When the active capacitive pen transmitting module TX1 is working, the transmitting module TX2 is adjusted to GND for shielding. When the transmitting module TX1 finishes transmitting the signal, the path connected by the transmitting module changes from GND to the path that is actually connected to the micro control unit, and then the transmitting signal is transmitted through the transmitting module TX2. In a complete cycle, the external terminal collects the first communication signal of the transmitting module TX1 and the second communication signal transmitted by the transmitting module TX2. The active capacitive pen has a tilt angle, and only TX1 and TX2 are provided without the GND connected to the shielding ring 30, thereby solving the short circuit problem in the structure caused by the connection of the shielding ring 30 to the ground due to the small space.

[0063] Referring to Figures 1 to 3 In an embodiment, the first communication module 60 is a transmitting module TX, and the second communication module 70 is a receiving module RX. The second communication module includes a receiving circuit 7030 and an annular thread coil 7020.

[0064] The input end of the receiving circuit 7030 is connected to the annular thread coil 7020 and the shielding ring 30. The annular thread coil 7020 is arranged around the end of the capacitive pen housing 10 close to the shielding ring 30. The output end of the receiving circuit 7030 is connected to the common terminal of the path switching circuit 50.

[0065] In this embodiment, the annular thread coil 7020 is the same as the annular thread coil 7020 in the above embodiment, which will not be described again. When the active capacitive stylus is used in an inclined manner, the annular thread coil 7020 has any number of coils contacting the touch screen, thereby forming a contact surface with a corresponding area. The annular thread coil 7020 receives a second communication signal corresponding to the number of turns from the touch screen. The second communication signal is transmitted from the annular thread coil 7020 to the receiving circuit 7030, and then transmitted to the micro control unit 40 through the path switching circuit 50. The micro control unit 40 obtains the inclination angle of the active capacitive stylus from the second communication signal. Two paths, the transmitting module TX and the receiving module RX, are used to multiplex the receiving module RX, and the working condition of the receiving module RX is changed through a software algorithm. When the active capacitive stylus TX is working, the receiving module RX is adjusted to be grounded GND for shielding. When the receiving module TX finishes transmitting the signal, the signal of the receiving module RX changes from GND to RX for receiving the signal. In a complete cycle, the tablet can receive the first communication signal and transmit the second communication signal. The active capacitive stylus can normally communicate, and the short circuit problem between the RX and the GND due to the connection of the shielding ring 30 and the ground is solved.

[0066] Referring to Figures 1 to 3 In an embodiment, the first communication module 60 includes a first transmitting circuit 6010 and a probe 6020. The probe 6020 is arranged at one end of the capacitive stylus shell 10 close to the shielding ring, and part of the probe 6020 is arranged inside the capacitive stylus shell 10, and the other part is arranged outside the capacitive stylus shell 10.

[0067] The input end of the first transmitting circuit 6010 is connected to the first communication end of the micro control unit 40, and the output end of the first transmitting circuit 6010 is connected to one end of the probe 6020 inside the capacitive stylus shell.

[0068] In this embodiment, the probe 6020 directly contacts and acts on the touch screen. In order to prolong the service life of the probe 6020 and prevent the probe 6020 from scratching the touch screen, the probe 6020 can be sleeved with a super-conductive silica gel sleeve. When the micro control unit 40 outputs the first communication signal, the first communication signal is transmitted to the probe 6020 through the first transmitting circuit 6010. In another embodiment, the first communication signal also contains tilt angle information, and the tilt angle information acquisition process is as described above, which will not be repeated here. It can be understood that the first communication module 60 and the second communication module 70 operate in opposite states as described above. Therefore, when the probe 6020 outputs the first communication signal to the touch screen, the shielding ring 30 is in a grounded state, thereby shielding the interference signals around the probe 6020, reducing the error generated when the probe 6020 outputs the first communication signal to the touch screen, and the touch screen obtains the pen drop position of the active capacitive stylus through the first communication signal.

[0069] The application also provides a communication control method of an active capacitive stylus, which is applied to the active capacitive stylus described above and includes a micro control unit, a path switching circuit, a first communication module and a second communication module. Referring to Figure 4 , the communication control method of the active capacitive stylus includes:

[0070] In step S100, when the micro control unit outputs a communication signal to the first communication module, the path switching circuit is controlled to connect the second communication module with the ground, so as to control the shielding ring to be grounded through the second communication module and the path switching circuit in sequence.

[0071] When the micro control unit outputs a communication signal to the first communication module, the micro control unit outputs a path switching signal to the path switching circuit, the path switching circuit grounds the second communication module, so that the shielding ring is grounded through the second communication module and the path switching circuit in sequence, which can protect the first communication module and reduce interference, thereby improving the accuracy of the communication signal output by the first communication module.

[0072] In step S200, when the micro control unit outputs a communication signal to the second communication module or receives a communication signal transmitted by the second communication module, the path switching circuit is controlled to connect the second communication module with the micro control unit.

[0073] When the micro control unit outputs a communication signal to the second communication module or receives a communication signal from the second communication module, the micro control unit outputs a path switching signal to the path switching circuit, and the path switching circuit connects the second communication module with the micro control unit. At this time, the first communication module stops working, the shielding ring is connected with the second communication module and is in the same working state, thereby preventing short circuit failure caused by false touch of the second communication module and the shielding ring.

[0074] It can be understood that the active capacitive pen needs to continuously record the pen tip landing point and the tilt angle during writing and drawing, and the micro control unit needs to output the landing point and the tilt angle information in a complete sampling period, and the landing point and the tilt angle information are obtained from the signals output by the first communication module and the second communication module, and the combination of each sampling period forms the entire writing process, and each sampling period of the application is sequentially executed, when the second communication module outputs the communication signal, the step S100 and the step S200 are executed once in each sampling period, when the second communication module receives the communication signal, the first communication module outputs the communication signal after the second communication module receives the communication signal, if the second communication module does not receive the communication signal, the first communication module does not work, that is, the step S200 is executed and then the step S100 is executed in each sampling period, and the landing point and the tilt angle information collected in each sampling period are combined, and the handwriting of the user in a period of time is fitted. Specifically, in each complete sampling period of the touch screen, the first communication signal is output in a period of time, the micro control unit outputs the corresponding path switching signal to the path switching circuit, so that the path switching circuit switches the communication path to control the second communication module to be in communication, since the shielding ring is connected with the second communication module, the shielding ring can be connected to the ground through the second communication module and the path switching circuit, at this time, the first communication module outputs the first communication signal output by the micro control unit to the external terminal, and the first communication module completes signal transmission under the shielding effect of the shielding ring. The second communication signal is output in another period of time, the micro control unit outputs the corresponding path switching signal to the path switching circuit, so that the path switching circuit switches the communication path to control the second communication module to be in communication with the micro control unit, at this time, the second communication module outputs the second communication signal output by the micro control unit to the external terminal. Thus, in each complete sampling period, the first communication module and the second communication module work in time, which ensures the integrity of the communication signal transmission, and the shielding ring can also protect the first communication module from interference, and at the same time, since the shielding ring is directly connected with the second communication module and the shielding ring is not grounded at this time, the second communication module will not be short-circuited and failed due to the misoperation.

[0075] The application further provides a communication controller of the active capacitive pen, which comprises a memory and a processor, and the memory stores a communication control program of the active capacitive pen, and the communication control program of the active capacitive pen is executed by the processor to realize the steps of the communication control method of the active capacitive pen.

[0076] The application further provides a mobile terminal control system, which comprises a mobile terminal and the active capacitive pen.

[0077] The detailed structure of the active capacitive pen can refer to the above-mentioned embodiments, which will not be described here again. It can be understood that, since the active capacitive pen is used in the mobile terminal control system of the present application, the embodiments of the mobile terminal control system of the present application include all the technical solutions of all the embodiments of the active capacitive pen, and the technical effects achieved are also completely the same, which will not be described here again.

[0078] The above-mentioned is only the optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields under the inventive concept of the present application is included in the patent protection scope of the present application.

Claims

1. An active capacitive pen, characterized by, The active capacitive pen comprises: a capacitive pen shell; an electric control board arranged in the capacitive pen shell; a shielding ring arranged in the capacitive pen shell and close to one end of the capacitive pen shell; a micro control unit, a path switching circuit, a first communication module and a second communication module arranged on the electric control board; two communication ends of the micro control unit are connected with the first communication module and a first switching end of the path switching circuit respectively; a control end of the micro control unit is connected with a controlled end of the path switching circuit; a second switching end of the path switching circuit is grounded; a common end of the path switching circuit is connected with a first end of the second communication module; and a second end of the second communication module is connected with the shielding ring; wherein the micro control unit is configured to output a path switching signal, output a first communication signal to the first communication module, output a second communication signal to the second communication module, or receive a second communication signal output by the second communication module; the path switching circuit is configured to connect the second communication module with the micro control unit or connect the second communication module with the ground according to the path switching signal output by the micro control unit; the micro control unit is specifically configured to control the path switching circuit to connect the second communication module with the ground when outputting the first communication signal to the first communication module, so as to control the shielding ring to be grounded through the second communication module and the path switching circuit in turn.

2. The active capacitive pen of claim 1, wherein, the micro control unit is specifically configured to periodically output the path switching signal, so as to control the path switching circuit to switch the second communication module to connect with the micro control unit or the ground alternately.

3. The active capacitive pen of claim 1, wherein, the first communication module and the second communication module are both transmitting modules; the second communication module comprises a second transmitting circuit and a ring-shaped threaded coil, and the ring-shaped threaded coil is arranged around one end of the capacitive pen shell close to the shielding ring; an input end of the second transmitting circuit is connected with the common end of the path switching circuit, and an output end of the second transmitting circuit is connected with the ring-shaped threaded coil and the shielding ring.

4. The active capacitive pen of claim 1, wherein, the first communication module is a transmitting module, and the second communication module is a receiving module; the second communication module comprises a receiving circuit and a ring-shaped threaded coil, and the ring-shaped threaded coil is arranged around one end of the capacitive pen shell close to the shielding ring; an input end of the receiving circuit is connected with the ring-shaped threaded coil and the shielding ring, and an output end of the receiving circuit is connected with the common end of the path switching circuit.

5. The active capacitive pen of claim 1, wherein, the first communication module is a transmitting module; the first communication module comprises a first transmitting circuit and a probe, the probe is arranged at one end of the capacitive pen shell close to the shielding ring, and part of the probe is arranged inside the capacitive pen shell and the other part is arranged outside the capacitive pen shell; an input end of the first transmitting circuit is connected with the first communication end of the micro control unit, and an output end of the first transmitting circuit is connected with one end of the probe inside the capacitive pen shell.

6. A communication control method of an active capacitive pen, applied to the active capacitive pen as claimed in any one of claims 1-5, the active capacitive pen comprising a micro control unit, a path switching circuit, a first communication module and a second communication module, characterized in that, The communication control method of the active capacitive pen comprises: When the micro control unit outputs a communication signal to the first communication module, the path switching circuit is controlled to connect the second communication module with the ground, so as to control the shielding ring to be grounded through the second communication module and the path switching circuit in turn. When the micro control unit outputs a communication signal to the second communication module or receives a communication signal transmitted by the second communication module, the path switching circuit is controlled to connect the second communication module with the micro control unit.

7. A communication controller of an active capacitive pen, characterized by, The communication controller of the active capacitive stylus comprises a memory and a processor, and the memory stores a communication control program of the active capacitive stylus, and the communication control program of the active capacitive stylus is executed by the processor to implement the steps of the communication control method of the active capacitive stylus as claimed in claim 6.

8. A mobile terminal control system characterized by comprising: The active capacitive stylus as claimed in any one of claims 1 to 4 is used in a mobile terminal.

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