Capacitance pen
By designing a capacitive pen that includes a pen tip module, circuit board, and mode switching switch, the working mode can be automatically switched to adapt to the communication protocols of different touch screens, solving the problem of poor compatibility of existing capacitive pens and achieving a multi-purpose and cost-effective user experience.
Patent Information
- Application Number
- CN202520028468.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-02
AI Technical Summary
Existing capacitive pens suffer from poor compatibility due to proprietary protocols imposed by manufacturers. Users need to purchase multiple capacitive pens to meet the needs of different devices, increasing economic costs and wasting resources.
Design a capacitive pen that includes a pen tip module, a circuit board, a controller, a mode switching switch, and first and second control circuits. By determining the compatibility of the communication protocols between the touch screen and the capacitive pen, the pen can automatically switch between active and passive modes, achieving compatibility and versatility of a single pen across different devices.
It achieves compatibility and versatility of capacitive styluses across different touchscreens, providing a highly accurate writing experience. It can also replace fingers for simple operations when protocols are incompatible, reducing equipment and economic costs.
Smart Images
Figure CN223796931U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the field of touch display, in particular to a capacitive pen. BACKGROUND
[0002] With the development of electronic and communication technology, various terminals need to use a touch pen to replace a keyboard or a finger touch operation screen, for example, in a tablet computer, many are configured with a touch pen to input information. As a kind of touch pen, the capacitive pen is more and more applied to various electronic devices. The capacitive pen is made of a conductor material and has a conductive characteristic, and is used to touch a capacitive screen to complete a man-machine dialogue operation. SUMMARY
[0003] The present disclosure aims to at least solve one of the technical problems existing in the prior art, and proposes a capacitive pen.
[0004] In order to achieve the above purpose, the present disclosure provides a capacitive pen, comprising a pen tip module and a circuit board;
[0005] The circuit board is provided with a controller, a mode switching switch, a first control circuit and a second control circuit;
[0006] The first end of the mode switching switch is electrically connected with the pen tip module and the controller, the second end of the mode switching switch is electrically connected with the first control circuit, and the third end of the mode switching switch is electrically connected with the second control circuit;
[0007] The controller is configured to, in response to a screen pen contact signal, judge whether the communication protocol of the touch screen matches the communication protocol of the capacitive pen, if matched, control the first end and the second end of the mode switching switch to be conductive, and generate a first communication signal according to the communication protocol; if not matched, control the first end and the third end of the mode switching switch to be conductive;
[0008] The first control circuit is configured to transmit the first communication signal to the touch screen through the pen tip module, so that the touch screen determines touch information according to the first communication signal;
[0009] The second control circuit is configured to receive a second communication signal sent by the touch screen, process the second communication signal, and transmit the processed second communication signal to the controller; the controller is further configured to transmit the processed second communication signal to the touch screen through the pen tip module, so that the touch screen determines touch information according to the processed second communication signal.
[0010] In some embodiments, the controller is specifically configured to, in response to the screen pen contact signal, control the first end and the second end of the mode switching switch to be conductive, and generate a test signal according to the communication protocol of the capacitive pen, and transmit the test signal to the first control circuit;
[0011] The first control circuit is further configured to transmit the test signal to the touch screen through the stylus tip module, and receive an induction signal emitted by the touch screen based on the test signal through the stylus tip module, and transmit the induction signal to the controller;
[0012] The controller is further configured to determine whether the communication protocol of the touch screen matches the communication protocol of the capacitive pen according to the timing of the induction signal and the timing of the test signal.
[0013] In some embodiments, the first control circuit includes a first transmission sub-circuit and a first amplification sub-circuit,
[0014] The first end of the first transmission sub-circuit is electrically connected to the second end of the mode switching switch, and the second end of the first transmission sub-circuit is electrically connected to the controller; the first transmission sub-circuit is configured to receive the induction signal emitted by the touch screen through the stylus tip module, and transmit the induction signal to the controller;
[0015] The first end of the first amplification sub-circuit is electrically connected to the second end of the mode switching switch, and the second end of the first amplification sub-circuit is electrically connected to the controller; the first amplification sub-circuit is configured to amplify the first communication signal and transmit the amplified first communication signal to the touch screen through the stylus tip module.
[0016] In some embodiments, the second control circuit includes a processing sub-circuit and a second transmission sub-circuit;
[0017] The first end of the processing sub-circuit is electrically connected to the second end of the mode switching switch, and the second end of the processing sub-circuit is electrically connected to the controller; the processing sub-circuit is configured to perform inversion and amplification processing on the second communication signal, and transmit the inverted and amplified second communication signal to the controller;
[0018] The first end of the second transmission sub-circuit is electrically connected to the second end of the mode switching switch, and the second end of the second transmission sub-circuit is electrically connected to the controller; the second transmission sub-circuit is configured to obtain the amplified and inverted second communication signal from the controller and transmit it to the stylus tip module.
[0019] In some embodiments, the stylus tip module includes a transmitting electrode, an insulating layer, and a receiving electrode;
[0020] The transmitting electrode comprises a pen tip and an electrode body part; the pen tip is arranged at one end of the electrode body part and is electrically connected with the electrode body part; the electrode body part is electrically connected with the first end of the mode switching switch;
[0021] The insulating layer is sleeved outside the electrode body part;
[0022] The receiving electrode is sleeved outside the insulating layer and is electrically connected with the first end of the mode switching switch.
[0023] In some embodiments, the capacitive pen further comprises a pressure sensor, the pressure sensor is located at a side of the electrode body part away from the pen tip; the pressure sensor is electrically connected with the controller;
[0024] The pressure between the electrode body part and the pressure sensor is generated at least when the pen tip module contacts the touch screen;
[0025] The pressure sensor is configured to detect the pressure between the electrode body part and the pressure sensor, generate the screen pen contact signal when the pressure between the electrode body part and the pressure sensor is not less than a set threshold, and send the screen pen contact signal to the controller.
[0026] In some embodiments, the pressure sensor is further configured to generate a screen pen separation signal when the pressure between the pen tip module and the pressure sensor is less than the set threshold, and transmit the screen pen separation signal to the controller, so that the controller controls the first end and the second end of the mode switching switch to be conductive.
[0027] In some embodiments, the capacitive pen further comprises a shell and a buffer; the shell is sleeved outside the circuit board;
[0028] The circuit board is fixedly connected with the shell, and the pen tip module can move relative to the shell;
[0029] The buffer is located between the pressure sensor and the circuit board.
[0030] In some embodiments, the pen tip and the electrode body part are integrated, the material of the pen tip comprises an organic matter, and the material of the electrode body part comprises a metal.
[0031] In some embodiments, the capacitive pen further comprises a conductive pen head; the conductive pen head and the pen tip module are respectively located at two sides of the circuit board.
[0032] The capacitive pen further comprises a shell, the shell comprising an insulating part and a conductive part, wherein the insulating part is sleeved outside the pen tip module, and the conductive part is sleeved outside the circuit board.
[0033] The conductive part is electrically connected with the conductive pen head. BRIEF DESCRIPTION OF DRAWINGS
[0034] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, which together with the specific embodiments described below, serve to explain the present disclosure but do not constitute a limitation thereof. In the drawings:
[0035] Figure 1 is a structural composition schematic diagram of a capacitive pen in some embodiments of the present disclosure;
[0036] Figure 2 is a structural composition schematic diagram of a capacitive pen in some embodiments of the present disclosure;
[0037] Figure 3 is a structural composition schematic diagram of a capacitive pen in some embodiments of the present disclosure;
[0038] Figure 4 is a circuit structure schematic diagram of a capacitive pen in some embodiments of the present disclosure;
[0039] Figure 5 is a circuit structure schematic diagram of a capacitive pen in some embodiments of the present disclosure;
[0040] Figure 6 is a touch process waveform diagram of a capacitive pen in some embodiments of the present disclosure;
[0041] Figure 7 is a touch process waveform diagram of a capacitive pen in some embodiments of the present disclosure.
[0042] 1, pen tip module; 11, transmitting electrode; 111, pen tip; 112, electrode main body part; 12, insulating layer; 13, receiving electrode; 2, shell; 3, indicator light; 4, charging port; 5, conductive pen head; 6, power switch; 7, pressure sensor; 72, buffer; 8, circuit board; 81, first control circuit; 82, second control circuit; 83, controller; 811, first amplification sub-circuit; 812, first transmission sub-circuit; 821, second transmission sub-circuit; 822, push-pull sub-circuit; 823, amplification sub-circuit; 9, power supply; 10, power supply control board. DETAILED DESCRIPTION
[0043] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.
[0044] The technical solutions and advantages of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any inventive effort fall within the scope of protection of the present disclosure.
[0045] Unless otherwise defined, technical terms or scientific terms used in the embodiments of the present disclosure shall have the ordinary meaning understood by those skilled in the art to which the present disclosure pertains. The terms “first”, “second”, and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are used to distinguish different components. Similarly, the terms “include”, “contain”, and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms “connect” or “connected” or similar terms do not limit to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper”, “lower”, “left”, “right”, and the like are used only to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.
[0046] As used herein, “parallel”, “perpendicular” includes the stated case and the approximately similar case to the stated case, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the error related to the measurement of a specific quantity (i.e., the limitation of the measurement system). For example, “parallel” includes absolute parallel and approximately parallel, wherein the acceptable deviation range of approximately parallel can be, for example, within 5° deviation; “perpendicular” includes absolute perpendicular and approximately perpendicular, wherein the acceptable deviation range of approximately perpendicular can also be, for example, within 5° deviation.
[0047] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or there can be an intermediate layer between the layer or element and the other layer or substrate.
[0048] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are schematic illustrations of idealized embodiments. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. The regions illustrated in the figures are schematic and many of the regions are not drawn to scale. The same reference numerals in different figures are intended to represent the same, comparable, or similar items.
[0049] In the related art, a capacitive stylus is an auxiliary device that uses a conductor material to simulate a human body (usually a finger) to complete human-computer interaction. A capacitive touch screen works by using the current of a human body. For example, when a finger touches the touch screen, a coupling capacitor is formed by the electric field of the human body, the user, and the surface of the touch screen. For high-frequency current, the capacitor is a direct conductor, so a part of the current flows to the finger.
[0050] In one specific embodiment, the touch screen includes a glass layer, and the outer surface facing the light-emitting side and the inner surface away from the light-emitting side are each coated with an ITO (indium tin oxide) layer, that is, a conductive glass film. The outer ITO coating layer serves as a working surface, and four electrodes are provided on the four corners. The inner ITO layer is a shielding layer to ensure a good working environment. The current flows to the finger through the four-corner electrodes, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the contact information, such as the position information of the contact point and the direction information of the stylus tip of the capacitive stylus, by accurately calculating the proportion of the four currents.
[0051] Capacitive styluses are mainly divided into active and passive types. An active capacitive stylus uses a chip to send a signal to enable the touch screen to determine the relevant coordinates, and can measure the force when the user uses the capacitive stylus to achieve handwriting recognition. The principle of a passive capacitive stylus is to simulate the touch effect of a finger. The stylus tip is made of conductive material and can cause a change in the capacitance of the touch screen matrix when it contacts the touch screen. A passive capacitive stylus can be used on all brands of touch screens, so it can also be called a universal capacitive stylus.
[0052] Due to the restrictions of private agreements of various manufacturers, active capacitive styluses are suitable for professional but single scenarios. Even a dual-protocol active stylus cannot achieve the use of a capacitive stylus on all devices of a user.
[0053] In order to better adapt to the tablet computer produced by the self brand, each company has developed a self brand capacitive pen. The capacitive pen and the touch screen can interact through the set communication protocol, so that the capacitive pen can serve the tablet computer produced by the self brand, so that the user can obtain better use experience. However, these capacitive pens are expensive, and due to the limitation of the private protocol of each manufacturer, the active capacitive pen is professional but single in application scene, and can only be adapted to the tablet computer of the same brand, and lacks compatibility for other tablet computers. Even the active capacitive pen with double protocols cannot realize that a capacitive pen is used in all device ends of the user.
[0054] For users, passive capacitive pens can meet most of the use requirements in daily use. However, in some special cases, such as drawing, the touch screen needs to obtain high-precision touch information, and at this time, the active capacitive pen with higher accuracy needs to work. For this case, if two capacitive pens are purchased, not only resource waste will be caused, but also economic cost will be increased. If a general passive capacitive pen is used, sometimes the use requirement cannot be met.
[0055] In order to at least alleviate or solve one of the above-mentioned technical problems, the present disclosure provides a capacitive pen.
[0056] Figure 1 is a structural composition schematic diagram of the capacitive pen in some embodiments of the present disclosure. Figure 2 is a structural composition schematic diagram of the capacitive pen in some embodiments of the present disclosure. Figure 3 is a structural composition schematic diagram of the capacitive pen in some embodiments of the present disclosure. Figure 4 is a circuit structure schematic diagram of the capacitive pen in some embodiments of the present disclosure. Figure 5 is a circuit structure schematic diagram of the capacitive pen in some embodiments of the present disclosure.
[0057] In some embodiments, as shown in Figure 3 , the capacitive pen of the present disclosure comprises a pen tip module 1 and a circuit board 8. As shown in Figure 4 , the circuit board 8 is provided with a controller 83, a mode switching switch, a first control circuit 81 and a second control circuit 82. The first end S1 of the mode switching switch is electrically connected with the pen tip module 1 and the controller 83, the second end S2 of the mode switching switch is electrically connected with the first control circuit 81, and the third end S3 of the mode switching switch is electrically connected with the second control circuit 82.
[0058] The controller 83 is configured to, in response to the screen pen contact signal, judge whether the communication protocol of the touch screen matches the communication protocol of the capacitive pen, if matching, control the first end S1 of the mode switching switch and the second end S2 of the mode switching switch to be conductive, and generate the first communication signal; if not matching, control the first end S1 of the mode switching switch and the third end S3 of the mode switching switch to be conductive. It should be noted that the communication protocol of the touch screen refers to the communication protocol supported by the touch screen, and similarly, the communication protocol of the capacitive pen refers to the communication protocol supported by the capacitive pen.
[0059] The first control circuit 81 is configured to transmit the first communication signal to the touch screen through the pen tip module 1, so that the touch screen determines the touch information according to the first communication signal.
[0060] The second control circuit 82 is configured to receive the second communication signal sent by the touch screen, process the second communication signal and transmit the processed second communication signal to the controller 83. The controller 83 is also configured to transmit the processed second communication signal to the touch screen through the pen tip module 1, so that the touch screen determines the touch information according to the processed second communication signal.
[0061] In the embodiment of the present disclosure, the controller 83 can judge whether the communication protocol between the capacitive pen and the touch screen can match, and adjust the capacitive pen to the corresponding working mode according to the matching structure. Specifically, when the communication protocol between the capacitive pen and the touch screen can match, the first end S1 of the mode switching switch and the second end S2 of the mode switching switch are conductive, and the working mode of the capacitive pen is in the active capacitive pen mode. At this time, the capacitive pen and the touch screen can complete information interaction according to the communication protocol through the first control circuit, and the touch screen can analyze the first communication signal according to the communication protocol to obtain touch information. When the communication protocol between the capacitive pen and the touch screen cannot match, the first end S1 of the mode switching switch and the third end S3 of the mode switching switch are conductive, and the working mode of the capacitive pen is in the passive capacitive pen mode. At this time, the second control circuit can process the second communication signal generated by the touch screen, and the processed second communication signal can make the touch screen obtain touch information. Further, the processing of the second communication signal may, for example, be amplification processing, so that the touch screen obtains more accurate touch information.
[0062] The disclosure can realize compatibility and multipurpose of a capacitive pen at a touch screen end, and integrate an active capacitive pen supporting a protocol and a passive capacitive pen not supporting the protocol into one capacitive pen. Meanwhile, when the capacitive pen is used, it can further judge whether the protocol supported by the capacitive pen matches the touch screen, and switch to a corresponding mode according to the matching result, so that the capacitive pen of the disclosure can realize high-accuracy writing experience at the touch screen end with protocol matching, and can also realize simple signature and graffiti operations and the like by replacing a finger at the touch screen end without protocol matching.
[0063] In some embodiments, as shown in Figure 4 The controller 83 is further configured to control the first end S1 of the mode switching switch and the second end S2 of the mode switching switch to be conductive in response to the screen-pen separation signal.
[0064] The controller 83 is specifically configured to control the first end S1 and the second end S2 of the mode switching switch to remain in a conductive state in response to the screen-pen contact signal, generate a test signal according to a communication protocol, and transmit the test signal to the first control circuit 81.
[0065] The first control circuit 81 is further configured to transmit the test signal to the touch screen through the pen tip module 1, receive an induction signal emitted by the touch screen based on the test signal through the pen tip module 1, and transmit the induction signal to the controller 83.
[0066] The controller 83 is further configured to receive the induction signal, and judge whether the communication protocol supported by the touch screen matches the communication protocol supported by the capacitive pen according to the time sequence of the induction signal and the time sequence of the test signal.
[0067] In the embodiment of the disclosure, the first end S1 of the mode switching switch and the second end S2 of the mode switching switch are conductive when the capacitive pen is not in contact with the touch screen, that is, the first control circuit 81 is connected between the pen tip module 1 and the controller 83. It can be understood that the capacitive pen of the disclosure is in the active pen mode by default. In this case, when the capacitive pen and the touch screen are in contact with each other, the capacitive pen generates a test signal according to a communication protocol through the controller and transmits it to the touch screen, and the touch screen feeds back an induction signal to the controller of the capacitive pen when receiving the test signal, so that the controller can judge whether the communication protocol of the capacitive pen and the touch screen matches according to the time sequence of the test signal and the induction signal. The capacitive pen of the embodiment of the disclosure can autonomously judge whether the protocol matches the touch screen to confirm the working mode of itself.
[0068] In some embodiments, as shown in Figure 5 The first control circuit 81 includes a first transmission sub-circuit 812 and a first amplification sub-circuit 811.
[0069] The first end of the first transmission sub-circuit 812 is electrically connected with the second end S2 of the mode switching switch, and the second end of the first transmission sub-circuit 812 is electrically connected with the controller 83. The first transmission sub-circuit 812 is configured to receive the sensing signal transmitted by the touch screen through the pen tip module 1 and transmit the sensing signal to the controller 83.
[0070] The first end of the first amplification sub-circuit 811 is electrically connected with the second end S2 of the mode switching switch, and the second end of the first amplification sub-circuit 811 is electrically connected with the controller 83. The first amplification sub-circuit 811 is configured to amplify the first communication signal and transmit the amplified first communication signal to the touch screen through the pen tip module 1.
[0071] Optionally, the first communication signal is an alternating current signal generated according to a protocol-specific frequency, voltage, signal waveform and timing.
[0072] In the embodiments of the present disclosure, the first amplification sub-circuit 811 amplifies the first communication signal, which can ensure the sensitivity of the touch screen in perceiving the first communication signal and the accuracy of the touch information confirmed by the touch screen according to the first communication signal.
[0073] It can be understood that, in the judgment of whether the protocol between the capacitive pen and the touch screen matches, the first amplification sub-circuit 811 also amplifies the test signal, which can ensure the sensitivity of the touch screen in perceiving the test signal and the immediacy of the capacitive pen in touching the touch screen.
[0074] In some embodiments, as shown in Figure 5 The second control circuit 82 includes a processing sub-circuit and a second transmission sub-circuit 821. The first end of the processing sub-circuit is electrically connected with the second end S2 of the mode switching switch, and the second end of the processing sub-circuit is electrically connected with the controller 83. The processing sub-circuit is configured to perform inversion and amplification processing on the second communication signal and transmit the inverted and amplified second communication signal to the controller 83. Moreover, the processing sub-circuit includes a push-pull sub-circuit 822 and an amplification sub-circuit 823 connected in series.
[0075] In one example, as shown in Figure 5 The processing sub-circuit includes a push-pull sub-circuit 822 and a second amplification sub-circuit 823 connected in series. The push-pull sub-circuit 822 is configured to perform inversion processing on the second communication signal and transmit the inverted second communication signal to the amplification sub-circuit. The second amplification sub-circuit 823 is configured to perform amplification processing on the inverted second communication signal and transmit the amplified inverted second communication signal to the controller 83.
[0076] In another example, the processing sub-circuit includes a second amplification sub-circuit 823 and a push-pull sub-circuit 822 connected in series, in which the second amplification sub-circuit 823 is configured to amplify the second communication signal and transmit the amplified second communication signal to the push-pull sub-circuit 822. The push-pull sub-circuit 822 is configured to invert the amplified second communication signal and transmit the inverted amplified second communication signal to the controller 83.
[0077] The first end of the second transmission sub-circuit 821 is electrically connected to the second end S2 of the mode switching switch, and the second end of the second transmission sub-circuit is electrically connected to the controller 83; the second transmission sub-circuit 821 is configured to obtain the amplified and inverted second communication signal from the controller 83 and transmit it to the pen tip module 1.
[0078] Considering that the contact area of the pen tip module 1 with the touch screen is relatively small, when the passive capacitive pen contacts the touch screen, the change of the electrical signal in the touch screen caused by the contact, such as the change of the current or the change of the voltage signal, is relatively small, which may cause the touch screen to inaccurately identify the position of the contact point, and the error distance is large, etc. The embodiments of the present disclosure set the push-pull sub-circuit 822 and the second amplification sub-circuit 823 to respectively invert and amplify the second communication signal, so that the touch screen analyzes and identifies the inverted and amplified second communication signal to obtain touch information, thereby improving the accuracy of the touch information obtained by the touch screen.
[0079] In some embodiments, as shown in FIG. 1, the pen tip module 1 includes a transmitting electrode (Pen Tx) 11, an insulating layer 12, and a receiving electrode (Pen Rx) 13. Figure 3
[0080] The transmitting electrode 11 includes a pen tip 111 and an electrode main body part 112; the pen tip 111 is arranged at one end of the electrode main body part 112 and is electrically connected to the electrode main body part 112; the electrode main body part 112 is electrically connected to the first end S1 of the mode switching switch. The insulating layer 12 is arranged outside the electrode main body part 112. The receiving electrode 13 is arranged outside the insulating layer 12 and is electrically connected to the first end S1 of the mode switching switch.
[0081] In the embodiments of the present disclosure, the insulating layer 12 between the transmitting electrode 11 and the receiving electrode 13 can prevent mutual interference between the signals in the transmitting electrode 11 and the signals in the receiving electrode 13.
[0082] In some embodiments, as shown in FIG. 1, the pen tip 111 is connected to the electrode main body part 112 as a whole, and the material of the pen tip 111 includes an organic matter, such as plastic. The material of the electrode main body part 112 includes metal. Figure 3
[0083] In the embodiment of the present disclosure, the pen tip 111 is integrally formed with the electrode body part 112, which can ensure the electrical connection between the pen tip 111 and the electrode body part 112, and the use of organic material for the pen tip 111 can improve the wear resistance of the pen tip 111.
[0084] In some embodiments, as shown in Figure 3 and Figure 4 , the capacitive pen further comprises a pressure sensor 7, which is located on the side of the electrode body part 112 away from the pen tip 111. The pressure sensor 7 is electrically connected to the controller 83. The electrode body part 112 and the pressure sensor 7 generate pressure at least when the pen tip module 1 contacts the touch screen. The pressure sensor 7 is configured to detect the pressure between the electrode body part 112 and the pressure sensor 7, generate a screen pen contact signal when the pressure between the electrode body part 112 and the pressure sensor 7 is not less than a set threshold, and send the screen pen contact signal to the controller 83.
[0085] In the embodiment of the present disclosure, the pressure sensor 7 is configured to measure the pressure between the pressure sensor 7 and the pen tip module 1, that is, to measure the pressure between the pen tip module 1 and the touch screen. When the pen tip module contacts the touch screen, a screen pen contact signal can be generated, so that the controller 83 can be notified when the pen tip module 1 contacts the touch screen to determine whether the communication protocol of the capacitive pen matches the communication protocol of the touch screen, thereby ensuring the instant touch of the capacitive pen on the touch screen.
[0086] In some embodiments, the pressure sensor 7 is further configured to generate a screen pen separation signal when the pressure between the pen tip module 1 and the pressure sensor 7 is less than a set threshold, and transmit the screen pen separation signal to the controller 83. The controller 83 is further configured to control the first end S1 of the mode switching switch and the second end S2 of the mode switching switch to be conductive in response to the screen pen separation signal.
[0087] In the embodiment of the present disclosure, when the capacitive pen is not in contact with the touch screen, for example, when the capacitive pen is in an idle state, or when the capacitive pen ends contact with the touch screen, the pressure sensor 7 can notify the controller 83 to control the first end S1 of the mode switching switch and the second end S2 of the mode switching switch to be conductive, so that when the capacitive pen is used to control the touch screen next time, the transmission of the test signal can be realized through the controller 83 and the first control circuit 81 to determine whether the communication protocol between the capacitive pen and the touch screen matches.
[0088] In some embodiments, as shown in Figure 3 and Figure 4 , the capacitive pen further comprises a housing 2 and a buffer 72. As shown in Figure 3As shown, the shell 2 is sleeved outside the circuit board 8, and the circuit board 8 is fixedly connected with the shell 2. The pen tip module 1 can move relative to the shell 2, for example, when the capacitive pen contacts the touch screen, the pen tip module 1 moves relative to the shell 2, and pressure is generated between the pressure sensor 7 and the pen tip module 1. The buffer 72 is located between the pressure sensor 7 and the circuit board 8.
[0089] In the embodiment of the present disclosure, the circuit board 8 is fixedly connected to the shell, and the buffer 72 arranged between the pressure sensor 7 and the circuit board 8 can buffer the pressure between the pressure sensor 7 and the circuit board 8, thereby avoiding the circuit board 8 from being pressed and damaged to affect the use of the capacitive pen.
[0090] Optionally, the buffer 72 can be, for example, an elastic member, and further can be, for example, a spring.
[0091] When the capacitive pen does not contact the touch screen, the spring can be in a natural elongation state, that is, not under pressure. It can also be in a compressed state, that is, under a set initial pressure. The present disclosure does not limit this, and it can be set according to actual conditions.
[0092] Optionally, the buffer 72 can be connected with the circuit board 8 and the pressure sensor 7 respectively to avoid slipping.
[0093] Further optionally, a recess can be arranged on the side of the circuit board 8 close to the buffer 72, and at least part of the buffer 72 is located in the recess. Arranging the recess on the side of the circuit board 8 close to the buffer 72 can further fix the position of the buffer 72.
[0094] In some embodiments, the capacitive pen further comprises a conductive pen head 5. The conductive pen head 5 and the pen tip module 1 are located on two sides of the circuit board 8 respectively. The capacitive pen further comprises a shell 2, and the shell 2 comprises an insulating part and a conductive part, wherein the insulating part is sleeved outside at least part of the pen tip module 1, specifically, the insulating part is sleeved outside the receiving electrode 13, and the conductive part is sleeved outside the circuit board 8. The conductive part is electrically connected with the conductive pen head.
[0095] In the embodiment of the present disclosure, compared with the pen tip 111 in the pen tip module 1, the conductive pen head 5 is designed to be relatively thick. The relatively thick conductive pen head 5 can form a large enough touch area when contacting the touch screen, so as to absorb more electric signals. In this case, the conductive pen head 5 is electrically connected with the conductive part of the shell 2. When a user holds the capacitive pen with a hand, the fingers contact the conductive part of the shell 2. Therefore, the electric signals absorbed by the conductive pen head 5 can be transmitted to the hand through the conductive part of the shell 2, so as to realize simple writing or replace the fingers to click the touch screen. Moreover, the insulating part is sleeved outside the receiving electrode 13, which can avoid signal interference between the pen tip module 1 and the conductive part.
[0096] In some embodiments, such as Figure 3 and Figure 4 As shown, the capacitive pen also includes a power supply 9. The power supply 9 is configured to power the circuit board 8 and the pressure sensor 7.
[0097] Optionally, such as Figure 1 As shown, the capacitive pen also includes a power switch 6. The power switch 6 is used to turn on or off the electrical connection between the power supply 9 and the circuit board 8, and the electrical connection between the power supply 9 and the pressure sensor 7.
[0098] Optionally, the power source 9 can be a dry cell battery, a rechargeable battery such as a lithium battery, etc.
[0099] If power source 9 is a rechargeable battery, such as Figure 3 As shown, the capacitive pen also includes a power control board 10, and, as... Figure 2 As shown, the housing 2 is provided with a charging port 4, which is used to connect the power control board 10 to an external charging device. The power control board 10 is configured to convert the voltage provided by the external charging device into a voltage that matches the power supply 9 of the capacitive pen in order to charge the power supply 9.
[0100] Optionally, such as Figure 2 As shown, the capacitive pen also includes an indicator light 3.
[0101] In one example, indicator light 3 is used to indicate the charging status of power supply 9. Optionally, indicator light 3 is located near charging port 4. In another example, indicator light 3 is configured to indicate the operating mode of the capacitive stylus; for example, the color or brightness of indicator light 3 differs when the stylus is in active capacitive stylus mode and passive capacitive stylus mode.
[0102] When using the pen tip module 1 to control the touchscreen, both the active and passive capacitive pen modes require power; therefore, they can be referred to as active active capacitive pen mode and active passive capacitive pen mode, respectively. The conductive pen tip 5 does not require power; when using the conductive pen tip 5 to control the touchscreen, the capacitive pen is in passive capacitive pen mode.
[0103] The working modes of the capacitive pen are further described below with reference to specific embodiments.
[0104] In some embodiments, when the circuit board 8 is connected to the power supply 9 through the power switch 6, the pressure sensor 7 is connected to the power supply 9, the controller 83 defaults to connecting the first end S1 of the mode switching switch to the second end S2 of the mode switching switch, i.e. the capacitive pen is in the active active capacitive pen mode at this time. When the capacitive pen contacts the touch screen, the transmitting electrode 11 sends a test signal according to the protocol to the touch screen, and the touch screen returns an induction signal according to the protocol after receiving the test signal. The controller 83 analyzes the induction signal received by the receiving electrode 13 in real time, judges whether it is a protocol-specific communication signal, and controls the working mode of the capacitive pen: if the induction signal is not detected as a code voltage corresponding to the protocol within a preset time, for example, within 16.67 ms, the first end S1 of the mode switching switch is connected to the third end S3 of the mode switching switch, i.e. switched to the active passive capacitive pen mode. If the induction signal is detected as a code voltage corresponding to the protocol within 16.67 ms, the active active capacitive pen mode is continued.
[0105] In one example, when the pen tip module 1 contacts the touch screen, and the active pen protocol supported by the touch screen matches the capacitive pen protocol of the present disclosure, the first end S1 of the mode switching switch is connected to the second end S2 of the mode switching switch, i.e. the capacitive pen is in the active active capacitive pen mode at this time. When the pen tip module 1 contacts the touch screen, the transmitting electrode 11 of the capacitive pen will transmit a test signal according to the protocol-specific frequency, voltage, signal waveform and timing, i.e. a downlink code signal generated according to the protocol. The touch screen includes a touch transmitting electrode Touch Tx and a touch receiving electrode Touch Rx. The touch transmitting electrode Touch Tx can transmit an induction signal to the pen tip module 1 under the drive of a scanning signal, and the touch receiving electrode Touch Rx can receive the test signal transmitted by the pen tip module 1 under the drive of a scanning signal. After the pen tip module 1 and the touch screen form a capacitive coupling, the test signal transmitted by the pen tip module 1 is coupled to the touch receiving electrode Touch Rx of the touch screen through the coupling capacitor. At the same time, the receiving electrode Pen Rx of the capacitive pen can receive an uplink code signal, i.e. an induction signal, generated by the touch transmitting electrode Touch Tx of the touch screen in response to the test signal and according to the protocol. The active capacitive pen and the touch screen complete the connection according to the timing of the code signal. Figure 6 is a touch process waveform diagram of the capacitive pen in some embodiments of the present disclosure, specifically a timing signal diagram of the capacitive pen and the touch screen. Specifically, as shown in Figure 6 by judging whether the timing of the test signal transmitted by the transmitting electrode 11 (Pen Tx) of the capacitive pen and the timing of the induction signal received by the receiving electrode 13 (Pen Rx) of the capacitive pen conform to the timing signal (Clock) of the communication protocol, the matching of the capacitive pen and the touch screen can be determined. For example, in Figure 6In the embodiment shown, the timing of the test signal transmitted by the capacitive pen transmitting electrode 11 (Pen Tx) and the timing of the induced signal received by the capacitive pen receiving electrode 13 (Pen Rx) satisfy the protocol-specific timing signal, i.e. at this time, the capacitive pen and the touch screen complete protocol matching. The capacitive pen is still in the active active pen mode, at this time, the screen pen generates capacitive coupling, the controller 83 generates a first communication signal according to the protocol as a communication protocol signal for interaction with the capacitive touch screen, which is transmitted to the touch screen through the first amplification sub-circuit 811 and the transmitting electrode 11 in the nib module 1. The touch screen determines the position of the nib according to the signal strength and phase change of the received first communication signal. The protocol matching between the capacitive pen and the touch screen, the high-voltage pulse signal transmitted by the nib module 1 is synchronized with the timing of the capacitive touch screen, which can enhance capacitive sensing, thereby enabling fine writing of the capacitive pen.
[0106] In another example, when the nib module 1 is in contact with the touch screen, and the active pen protocol supported by the touch screen does not match the capacitive pen protocol, or the touch screen does not support the capacitive pen protocol, the first end S1 of the mode switching switch is conductive with the third end S3 of the mode switching switch, i.e. at this time, the capacitive pen is in the active passive capacitive pen mode. This example can utilize the characteristics of the touch screen detecting finger signals to achieve the positioning of the touch point by the touch screen. However, due to the small contact area between the fine nib and the touch screen, which is smaller than the touch between the finger and the touch screen, the electrical signal change caused by the nib 111 cannot be detected by the receiving channel Touch Rx of the touch screen. In the embodiment of the present disclosure, the touch screen transmits a second communication signal to the second control circuit 82, the second amplification sub-circuit 823 in the second control circuit 82 can amplify the second communication signal transmitted by the touch screen into a high-voltage signal, and the push-pull sub-circuit 822 can invert the high-voltage signal, and then the amplified second communication signal is directly conducted to the touch screen through the controller 83 inside the capacitive pen. The touch screen detects the surface capacitive change according to the amplified second communication signal to determine the position of the signal change and thus confirm the position of the contact. Specifically, when the nib module 1 contacts the touch screen, the receiving electrode 13 receives the second communication signal transmitted by the touch screen transmitting channel Touch Tx, the second amplification sub-circuit and the push-pull sub-circuit in the second control circuit amplify and invert the second communication signal respectively, the transmitting electrode Pen Tx of the nib module 1 forms a coupling capacitor with the contact position of the touch screen, and transmits the inverted and amplified second communication signal to the touch screen. The Fourier superposition causes the electrical signal at the contact position to change, and the touch screen detects the changed electrical signal to obtain the contact position.
[0107] Figure 7 is the touch process waveform diagram of the capacitive pen in some other embodiments of the present disclosure. Figure 7In the figure, Touch Scan represents the scanning signals of the touch transmission electrode Touch Tx and the touch reception electrode Touch Rx of the touch screen respectively. Pen Tx represents the sensing signal generated by the touch screen under the driving of the amplified and inverted second communication signal transmitted by the pen tip module 1. Final ADC represents the waveform diagram after the scanning signal and the sensing signal are superimposed by Fourier transform, and can also be understood as the final signal generated by the touch transmission electrode Touch Tx or the touch reception electrode Touch Rx of the touch screen under the driving of all signals.
[0108] In the case where the passive capacitive pen is not in contact with the touch screen, the touch transmission electrode Touch Tx and the touch reception electrode Touch Rx of the touch screen are only driven by the scanning signal at t3 and t4 respectively, and thus the signal emitted by the touch transmission electrode Touch Tx and the signal received by the touch reception electrode Touch Rx of the touch screen are consistent with the scanning signal respectively, i.e. the touch screen does not detect the change of the electric signal transmission, and it is determined that there is no touch at this time. In the case where the passive capacitive pen is in contact with the touch screen, the touch transmission electrode Touch Tx of the touch screen is only driven by the scanning signal at t1, and the touch reception electrode Touch Rx of the touch screen is driven by the scanning signal and the amplified and inverted second communication signal at t2, i.e. the final signal is obtained under the superposition of the scanning signal and the sensing signal. At this time, there is a large difference between the final signal and the scanning signal, and thus the passive capacitive pen can realize touch control. The working mode of the passive capacitive pen realizes the simulation of the touch finger signal by using electric signal, which is suitable for most touch screens and has universality.
[0109] When the conductive pen tip 5 of the capacitive pen is in contact with the touch screen, the conductive pen tip 5 has an area comparable to that of a finger in touch, and can realize touch point positioning by imitating the conductor touch effect of the finger. Specifically, when the conductive pen tip 5 at the tail is in contact with the surface of the touch screen, a coupling capacitor is formed between the conductive pen tip 5 and the conductive layer inside the touch screen, the conductive layer inside the touch screen has an alternating current or high-frequency current, the coupling capacitor becomes a direct conductor, and the conductive pen tip 5 can draw a very small current from the touch point of the touch screen. The change of the small current flowing away sensed by the detection circuit of the touch screen can determine the position of the conductive pen tip 5, thereby realizing touch control.
[0110] In summary, the present disclosure can realize switching between an active active capacitive stylus and an active passive capacitive stylus through the same pen tip module, wherein the active active capacitive stylus can make information transmission between the touch screen and the capacitive stylus according to protocol requirements, has advanced writing functions such as pressure sensing, inclination recognition, and anti-mis-touch, and has a thin pen tip, high positioning accuracy, and good paperless writing effect. The active passive capacitive stylus can realize flexible writing and drawing on the touch screen by replacing the finger, and can realize "one pen with two functions". Further, the conductive pen head of the present disclosure can be used as a passive passive capacitive stylus. The passive passive capacitive stylus has no power supply, and therefore, the conductive pen head is set to be thicker, so that a large enough touch area can be formed between the touch screen and the conductive pen head when they are in contact, to absorb more electric signals to simulate a finger. The electric signals are transmitted to the hand through the conductive shell, and the conductive pen head can be used for simple writing or replacing the finger to click the touch screen, thereby realizing "one pen with three functions". The present disclosure realizes compatibility and multipurpose of a capacitive stylus on the touch screen, integrates the active capacitive stylus supporting the protocol and the general capacitive stylus into one capacitive stylus, and realizes advanced writing experience on the touch screen with protocol matching, and can also replace the finger to realize simple signature and scribbling operation on the touch screen with protocol mismatching.
[0111] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the present disclosure.
Claims
1. A capacitive stylus, characterized by, The pen tip module and the circuit board are included. The controller, the mode switching switch, the first control circuit and the second control circuit are arranged on the circuit board. The first end of the mode switching switch is electrically connected with the pen tip module and the controller, the second end of the mode switching switch is electrically connected with the first control circuit, and the third end of the mode switching switch is electrically connected with the second control circuit. The controller is configured to, in response to the screen-pen contact signal, judge whether the communication protocol of the touch screen matches the communication protocol of the capacitive pen, if yes, control the first end and the second end of the mode switching switch to be conductive, and generate the first communication signal according to the communication protocol; if not, control the first end and the third end of the mode switching switch to be conductive. The first control circuit is configured to transmit the first communication signal to the touch screen through the pen tip module, so that the touch screen determines the touch information according to the first communication signal. The second control circuit is configured to receive the second communication signal sent by the touch screen, process the second communication signal, and transmit the processed second communication signal to the controller; the controller is further configured to transmit the processed second communication signal to the touch screen through the pen tip module, so that the touch screen determines the touch information according to the processed second communication signal.
2. The capacitance pen of claim 1, wherein The controller is specifically configured to, in response to the screen-pen contact signal, control the first end and the second end of the mode switching switch to be conductive, generate a test signal according to the communication protocol of the capacitive pen, and transmit the test signal to the first control circuit. The first control circuit is further configured to transmit the test signal to the touch screen through the pen tip module, and receive an induction signal emitted by the touch screen based on the test signal through the pen tip module, and transmit the induction signal to the controller. The controller is further configured to judge whether the communication protocol of the touch screen matches the communication protocol of the capacitive pen according to the time sequence of the induction signal and the time sequence of the test signal.
3. The capacitance pen according to claim 1 or 2, characterized in that, The first control circuit includes a first transmission sub-circuit and a first amplification sub-circuit, The first end of the first transmission sub-circuit is electrically connected with the second end of the mode switching switch, and the second end of the first transmission sub-circuit is electrically connected with the controller; the first transmission sub-circuit is configured to receive the induction signal emitted by the touch screen through the pen tip module, and transmit the induction signal to the controller; The first end of the first amplification sub-circuit is electrically connected with the second end of the mode switching switch, and the second end of the first amplification sub-circuit is electrically connected with the controller; the first amplification sub-circuit is configured to amplify the first communication signal and transmit the amplified first communication signal to the touch screen through the pen tip module.
4. The capacitance pen according to claim 1 or 2, characterized by The second control circuit includes a processing sub-circuit and a second transmission sub-circuit; A first end of the processing sub-circuit is electrically connected to a second end of the mode switching switch, and a second end of the processing sub-circuit is electrically connected to the controller; the processing sub-circuit is configured to perform inverse and amplification processing on the second communication signal and transmit the inverse and amplified second communication signal to the controller; A first end of the second transmission sub-circuit is electrically connected to the second end of the mode switching switch, and a second end of the second transmission sub-circuit is electrically connected to the controller; the second transmission sub-circuit is configured to obtain the amplified and inverse second communication signal from the controller and transmit it to the stylus tip module.
5. The capacitance pen according to claim 1 or 2, wherein The stylus tip module comprises a transmitting electrode, an insulating layer and a receiving electrode; The transmitting electrode comprises a stylus tip and an electrode body part; the stylus tip is arranged at one end of the electrode body part and is electrically connected to the electrode body part; the electrode body part is electrically connected to the first end of the mode switching switch; The insulating layer is arranged outside the electrode body part; The receiving electrode is arranged outside the insulating layer and is electrically connected to the first end of the mode switching switch.
6. The capacitive pen of claim 5, wherein, The capacitive stylus further comprises a pressure sensor, which is located on a side of the electrode body part away from the stylus tip; the pressure sensor is electrically connected to the controller; At least when the stylus tip module contacts the touch screen, pressure is generated between the electrode body part and the pressure sensor; The pressure sensor is configured to detect the pressure between the electrode body part and the pressure sensor, generate the screen stylus contact signal when the pressure between the electrode body part and the pressure sensor is not less than a set threshold, and send the screen stylus contact signal to the controller.
7. The capacitive pen of claim 6, wherein, The pressure sensor is further configured to generate a screen stylus separation signal when the pressure between the stylus tip module and the pressure sensor is less than the set threshold, and transmit the screen stylus separation signal to the controller, so that the controller controls the first end and the second end of the mode switching switch to be conductive.
8. The capacitive pen of claim 6, wherein, The capacitive stylus further comprises a housing and a buffer; the housing is arranged outside the circuit board; The circuit board is fixedly connected to the housing, and the stylus tip module can move relative to the housing; The buffer is located between the pressure sensor and the circuit board.
9. The capacitive pen of claim 5, wherein, The stylus tip is integrated with the electrode body part, the material of the stylus tip comprises an organic substance, and the material of the electrode body part comprises a metal.
10. The capacitance pen according to claim 1 or 2, wherein The capacitive stylus further comprises a conductive pen head; the conductive pen head and the stylus tip module are respectively located on two sides of the circuit board; The capacitive stylus further comprises a housing, the housing comprises an insulating part and a conductive part, wherein the insulating part is arranged outside the stylus tip module, and the conductive part is arranged outside the circuit board; The conductive part is electrically connected to the conductive pen head.