WO2018170871A1

WO2018170871A1 - Capacitance stylus system, capacitance stylus and capacitance stylus control circuit

Info

Publication number: WO2018170871A1
Application number: PCT/CN2017/078034
Authority: WO
Inventors: 魏海军
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2017-03-24
Filing date: 2017-03-24
Publication date: 2018-09-27
Also published as: CN108934180A; CN108934180B

Abstract

Disclosed are a capacitance stylus system, capacitance stylus and capacitance stylus control circuit, and the capacitance stylus system comprises: a capacitance stylus (1) and an electronic device (2), wherein the capacitance stylus (1) comprises an active electrode module (101), a passive sensor module (102), a first control module (103) and a first wireless communication module (104). The active electrode module (101) comprises an active electrode, and the passive sensor module (102) comprises a passive electrode; the electronic device (2) comprises a touch position detection module (201), a second control module (202), a second wireless communication module (203) and an operation execution module (204). By adding the passive sensor module (102) to the tail of the capacitance stylus (1), an erasing intention of a user can be acquired from the tip of the capacitance stylus, and the erasing intention is sent to the electronic device (2) via the first wireless communication module (104), so as to perform erasing without the need to mount an active transmission module at the tail of the capacitance stylus (1), thus simplifying structural design, saving on production costs, and decreasing power consumption.

Description

Capacitive pen system, capacitor pen and capacitor pen control circuit

Technical field

The embodiment of the invention belongs to the field of capacitive pens, and in particular relates to a capacitive pen system, a capacitive pen and a capacitive pen control circuit.

Background technique

Active capacitive pens, as the main peripheral input accessories for electronic devices with touch screens, are gradually gaining market attention. Usually, in the process of using the active capacitive pen, the user has the need to erase the existing content in addition to writing the new content normally.

There are two main ways to implement the erasing function of the active capacitive pen on the market:

The first way is based on the software implementation of the electronic device. In this case, the active capacitive pen only transmits the signal through the pen tip. The active capacitive pen and the electronic device cannot recognize the current intention of the user to write or erase through the pen tip signal. In the case where the tip of the active capacitive pen is defaulted to the writing mode, if there is an erasing requirement, the writing mode needs to be switched to the erasing mode by the software setting of the electronic device, and the tip of the active capacitive pen is used for the writing. The erase operation is performed, and after the erase is completed, the mode is switched to the normal writing mode. This implementation method does not require an active capacitive pen for special processing, and the universal active capacitive pen can be supported, but the manual switching mode is required during operation, which affects the user experience.

The second way is that the active capacitive pen end first recognizes the user's intention to erase the behavior. In this case, the active capacitive pen can only transmit the signal at the tip and the end of the pen, wherein the pen tail signal is different from the pen tip signal, and the electronic device The writing signal or the erasing signal is recognized by the characteristics of the tail signal and the tip signal; a typical way is to design a transmitting electrode at the tip of the pen and the tail to realize the writing and erasing functions respectively, and when writing normally, the electronic device The pen tip signal is detected. When the user inverts the pen body and touches the tail of the electronic device to use the erasing function, the electronic device detects the tail signal, and the frequency of the signal emitted by the pen tip electrode and the cap electrode is different, thereby facilitating the identification of the electronic device. The user's intention to write or erase the behavior. This approach increases power consumption and product cost by providing two signal transmitters on the active capacitive pen.

Summary of the invention

In order to solve the above problems, an embodiment of the present invention provides a capacitive pen system, a capacitive pen, and a capacitive pen control circuit.

In a first aspect, an embodiment of the present invention provides a capacitive pen system, where the capacitive pen system includes:

a capacitive pen and an electronic device;

The capacitive pen includes an active electrode module, a passive sensing module, a first control module, and a first wireless communication module, the active electrode module includes an active electrode, and the passive sensing module includes a passive electrode;

The electronic device includes a touch position detecting module, a second control module, a second wireless communication module, and an operation execution module;

The touch position detecting module detects an electrical signal emitted by the active electrode, the second control module determines a position coordinate of a contact point of the active electrode with the electronic device, and controls the operation execution module to perform a writing or clicking operation ;

The touch position detecting module detects a touch of the passive electrode, the second control module determines a position coordinate of a contact point of the passive electrode and the electronic device, and the passive sensing module detects a pressure received by the passive electrode, the first a control module controls the first wireless communication module to send a pressure detection result to the second wireless communication module, and transmits the result to the second control module, where the second control module controls the location according to the position coordinate and the pressure detection result The operation execution module performs an erase operation.

Optionally, the passive sensing module comprises one of the following pressure sensors: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.

Optionally, the first wireless communication module and the second wireless communication module are Bluetooth modules.

Further, the first control module is further configured to determine whether the pressure value detected by the passive sensing module is greater than a preset threshold, and when the detected pressure value is greater than a preset threshold, by using the first wireless communication module The electronic device transmits the pressure detection result.

Further, the capacitor pen further includes a power supply module, and the first control module is further configured to determine whether a length of time that the active electrode and the passive electrode are not in contact with the electronic device is greater than a preset threshold, and when the length of the contact is not greater than When the threshold is preset, the power supply module of the first control module is turned off.

In a second aspect, an embodiment of the present invention provides a capacitive pen applied to an electronic device with a touch panel, including:

a pen body, an active electrode module mounted on the head of the pen body, a passive sensing module mounted at the tail of the pen body, and a control module and a wireless communication module installed in the inner cavity of the pen body;

The active electrode module includes an active electrode for indicating a position on the touch panel;

The passive sensing module includes a passive electrode for simulating a touch operation of a user's finger, indicating a position on the touch panel, and detecting a pressure received by the passive electrode;

The control module controls the wireless communication module to send the pressure detection result acquired by the passive sensing module to the electronic device for controlling the erasing operation of the electronic device.

Optionally, the wireless communication module is a Bluetooth module.

Further, the capacitive pen further includes a power supply module, and the first control module controls opening and closing of the power supply module.

Further, the capacitive pen further includes a switch module for controlling opening and closing of the power supply module.

Further, the passive sensing module is detachably mounted with the pen body.

In a third aspect, an embodiment of the present invention provides a capacitive pen control circuit, where the capacitive pen control circuit includes an active electrode circuit unit, a passive sensing circuit unit, a main control circuit unit, and a wireless communication circuit unit, and the main control circuit unit The first input end and the second input end are respectively connected to the output ends of the active electrode circuit unit and the passive sensing circuit unit, and the first output end and the second output end of the main control circuit unit are respectively connected to the active electrode circuit unit And an input end of the wireless communication circuit unit, the passive sensing circuit unit is configured to output a pressure detection signal and output to the main control circuit unit, the main control circuit unit passes the pressure detection signal through the wireless communication circuit unit Sended to an external electronic device to control an erase operation of the electronic device.

Further, the passive sensing circuit unit includes a coupled passive electrode and a pressure sensing sub-circuit unit, and an output end of the pressure sensing sub-circuit unit is coupled to the second input end of the main control circuit unit.

Optionally, the wireless communication circuit unit comprises a Bluetooth chip.

Further, the capacitive pen control circuit further includes a power supply circuit unit, the power supply circuit unit is connected to the main control circuit unit, and the main control circuit unit sends a control signal to control the power supply circuit unit to supply or disconnect power.

Further, the capacitive pen control circuit further includes a switch circuit unit, and the switch circuit unit is connected to the power supply circuit unit to control power supply or power off of the power supply circuit unit.

According to the capacitive pen system and the capacitive pen provided by the embodiment of the present invention, by adding a passive sensing module to the end of the capacitive pen, the user can be erased by the detection result of the passive sensing module when the passive electrode contacts the touch panel of the electronic device. The operation intention is to send the erasing operation intention to the electronic device through the wireless communication module, and the electronic device directly performs the erasing operation. Compared with the prior art, the technical solution of the embodiment of the present invention does not need to be installed at the end of the capacitive pen. The active transmit module reduces structural design, saves product costs, and reduces power consumption. According to the capacitor pen control circuit provided by the embodiment of the invention, the active electrode circuit unit and the passive sensing circuit unit are controlled by the main control circuit, and the active writing and passive erasing control of the capacitor pen end can be realized, so that the capacitive pen using the circuit does not need to be Additional active electrode emitters can be added to streamline circuit design, saving product cost while reducing power consumption.

DRAWINGS

In order to more clearly illustrate the present invention or the prior art, a brief description of the drawings used in the embodiments or the description of the prior art will be briefly made. Obviously, the drawings in the following description are the present invention. Some embodiments, Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a perspective view of a capacitive pen system according to a first embodiment of the present invention;

2 is a structural block diagram of a capacitive pen system according to Embodiment 1 of the present invention;

3 is a schematic diagram of position detection of an active electrode according to Embodiment 1 of the present invention;

4 is another structural block diagram of a capacitive pen system according to Embodiment 1 of the present invention;

FIG. 5 is a schematic perspective view of a capacitive pen according to Embodiment 2 of the present invention; FIG.

6 is a cross-sectional view of a capacitive pen according to Embodiment 2 of the present invention;

FIG. 7 is another schematic cross-sectional view of a capacitive pen according to Embodiment 2 of the present invention; FIG.

8 is another schematic cross-sectional view of a capacitive pen according to Embodiment 2 of the present invention;

FIG. 9 is another perspective view of a capacitive pen according to Embodiment 2 of the present invention; FIG.

10 is a circuit block diagram of a capacitive pen control circuit according to Embodiment 3 of the present invention;

11 is a circuit block diagram of an active electrode circuit unit according to Embodiment 3 of the present invention;

12 is another circuit block diagram of a capacitive pen control circuit according to Embodiment 3 of the present invention;

FIG. 13 is still another circuit block diagram of a capacitive pen control circuit according to Embodiment 3 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The terms "first", "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, and are not intended to describe a specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products, or equipment.

References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.

Embodiment 1

See Figure 1 and Figure 2. The embodiment of the present invention provides a capacitive pen system, which includes two parts, a capacitive pen 1 and an electronic device 2 . In this embodiment, the electronic device 2 is an electronic device with a capacitive touch panel, such as a mobile phone. , ultrabook, tablet, etc.

The capacitive pen 1 includes at least an active electrode module 101, a passive sensing module 102, a first control module 103, and a first wireless communication module 104;

The electronic device 2 includes a touch position detecting module 201, a second control module 202, a second wireless communication module 203, and an operation executing module 204.

Specifically, the active electrode module 101 is installed at the tip position of the capacitive pen 1 , the passive electrode module 102 is installed at the end of the capacitive pen 1 , and the first control module 103 and the first wireless communication module 104 are installed. In the pen body of the capacitive pen 1.

In this embodiment, the active electrode module 101 includes an active electrode as a pen tip of the capacitive pen 1 for transmitting an electrical signal;

The passive sensing module 102 includes a passive electrode for simulating a touch operation of a user's finger. The passive electrode may be mounted in a fixed manner on the end of the capacitive pen 1 or may be attached as a detachable cap. The end position of the capacitive pen 1.

The passive sensing module 102 is further configured to detect the pressure received by the passive electrode, and transmit the pressure detection result to the first control module 103 to confirm whether the passive electrode is in contact with the touch panel of the electronic device 2;

Optionally, the passive sensing module 102 includes one of the following pressure sensors: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.

In one embodiment of the present embodiment, the pressure sensor used in the passive sensing module 102 is a piezoresistive pressure sensor, specifically a resistance strain gauge pressure sensor, and the resistance strain gauge of the resistance strain gauge pressure sensor is attached to the same. On the passive electrode, when the passive electrode contacts the electronic device to deform, the resistance strain gauge is deformed accordingly, and the corresponding pressure detection result can be obtained according to the resistance value change of the resistance strain gauge.

In another aspect of the embodiment, the pressure sensor used in the passive sensing module 102 is a capacitive pressure sensor, and specifically includes a pressure sensing electrode, and the pressure sensing electrode forms a capacitance with the passive electrode. When the passive electrode is displaced or deformed by the pressure, the passive sensing module 102 will obtain the capacitance value or the capacitance change value of the capacitor, thereby obtaining a corresponding pressure detection result.

Optionally, in other aspects of the embodiment, the passive sensing module 102 may specifically use other types of pressure sensors, such as a semiconductor strain gauge pressure sensor, a piezoresistive pressure sensor, an inductive pressure sensor, and the like.

The first control module 103 is configured to control the active electrode module 101 to transmit externally through the active electrode. The electrical signal, on the other hand, is used to control the first wireless communication module 104 to transmit the pressure detection result to the second wireless communication module 203 located in the electronic device 2, and then to the second control module 202 located at the electronic device 2.

The electronic device 2 includes a touch position detecting module 201, a second control module 202, and a second wireless communication module 203;

The touch position detecting module 201 is configured to detect an electrical signal emitted by the active electrode of the active electrode module 101 and detect a touch of the passive electrode of the passive sensing module 102.

Specifically, the touch position detecting module 201 is a touch panel of the electronic device 2 .

For the active electrode module 101, as shown in FIG. 3, the schematic diagram of the position detection of the active electrode of the active electrode module 101 on the touch panel is illustrated. When the active electrode contacts the touch panel, the active electrode emits an electrical signal to form an electric field. And a certain number of horizontal direction detecting electrodes and vertical direction detecting electrodes are distributed on the touch panel, and the horizontal direction detecting electrodes and the vertical direction detecting electrodes are used for detecting the electrical signals emitted by the active electrodes, which are emitted by the active electrodes. The electrical signal will be attenuated during the propagation process. Therefore, the closer the detection electrode is to the active electrode, the stronger the electrical signal strength is detected. As the distance increases, the signal gradually decays. According to this law, in the horizontal direction and the vertical direction. The position coordinates of the active electrode of the active electrode module 101 on the touch panel can be calculated.

For the passive sensing module 102, when the passive electrode contacts the touch panel, a coupling capacitor is formed between the passive electrode and the conductor layer of the touch panel, and the current generated by the detecting electrode of the touch position detecting module 201 flows to the contact point. The current intensity is proportional to the distance from the passive electrode to the detecting electrode. According to this rule, the position coordinates of the passive electrode of the passive sensing module 102 on the touch panel can be accurately calculated according to the calculated ratio and strength of the current.

The second control module 202 is configured to determine position coordinates of a contact point of the active electrode of the active electrode module 101 and the touch panel of the electronic device 2 to control the operation execution module 204 to perform a writing or clicking operation, and Determining the position coordinates of the contact point of the passive electrode of the passive sensing module 102 and the touch panel of the electronic device 2, and simultaneously analyzing the pressure detection result sent from the capacitive pen 1, and controlling the operation according to the obtained position coordinates and the pressure detection result. Execution module 204 performs an erase operation. Specifically, the second control module 202 is a CPU (Central Processing Unit) module installed in the electronic device.

In the above capacitive pen system, the active electrode module 101 of the capacitive pen 1 can perform a click or write operation, and the passive sensing module 102 of the capacitive pen 1 can perform an erase operation. The following describes the working process of the capacitive pen system.

Wherein, when the writing or clicking operation is performed by the active electrode module 101 of the capacitive pen 1, the working process is as follows:

S101. The active electrode of the active electrode module 101 contacts a touch panel of the electronic device 2;

S102. The active electrode module 101 generates an electric field on the surface of the touch panel by transmitting an electrical signal through the active electrode.

S103. The touch position detecting module 201 detects an intensity distribution of an electrical signal emitted by the active electrode, and The intensity distribution data of the detected electrical signal is sent to the second control module 202;

S104. The second control module 202 calculates a position coordinate of a contact point of the active electrode and the touch panel according to the intensity distribution data of the electrical signal.

S105. The second control module 202 controls the operation execution module 204 to perform a writing or clicking operation.

On the other hand, when the erasing operation is performed by the passive sensing module 102 of the capacitive pen 1, the working process is as follows:

S201, the passive electrode of the passive sensing module 102 contacts the touch panel of the electronic device 2;

S202, the passive sensing module 102 detects the pressure received by the passive electrode, and transmits the pressure detection result to the first control module 103, and the first control module 103 controls the first wireless communication module 104 to send the pressure detection result to the second. Wireless communication module 203, and transmitted to the second control module 202;

S203, the touch position detecting module 201 detects the touch of the passive electrode, and sends the touch detection data to the second control module 202;

S204, the second control module 202 calculates a position coordinate of a contact point of the passive electrode and the touch panel according to the touch detection data, and parses the pressure detection result;

S205. The second control module 202 controls the operation execution module 204 to perform an erase operation according to the obtained position coordinates and the analysis information of the pressure detection result.

As an alternative to the embodiment of the present invention, in step S202, the first control module 103 controls the first wireless communication module 104 to send the pressure detection result to the second wireless communication module 203, specifically: the first control module. 103: determining whether the pressure value detected by the passive sensing module 102 is greater than a preset threshold, and when the detected pressure value is greater than a preset threshold, the second wireless communication to the electronic device 2 by the first wireless communication module 104 The communication module 203 transmits the pressure detection result.

Optionally, the above steps S202 and S203 are performed synchronously.

Optionally, in this embodiment, the first wireless communication module 104 and the second wireless communication module 203 are both Bluetooth modules.

In this embodiment, as shown in FIG. 4, the capacitive pen 1 further includes a power supply module 105, and the first control module 103 is further configured to determine the active electrode module 101 and the passive sensing module 102 and the electronic device. Whether the duration of the untouched state is greater than a preset threshold, and when the duration of the untouched state is greater than a preset threshold, the first control module 103 controls the power supply module 105 to be turned off.

Optionally, the capacitive pen 1 further includes a switch module 106 for the user to manually control the opening or closing of the power supply module 105.

According to an embodiment of the present invention, a capacitive pen system is provided by adding a passive sensing module to a tail of a capacitive pen, the passive sensing module including a passive electrode, and when the passive electrode contacts the touch panel of the electronic device, the passive sensing module Detecting the pressure received by the passive electrode, thereby obtaining the user's intention of erasing operation according to the detection result, and transmitting the intention of the erasing operation to the electronic device through the wireless communication module, and the electronic device directly performs the erasing operation, compared with the prior art. The technical solution of the embodiment of the invention does not need to install an active sending module at the end of the capacitive pen, which can simplify the structural design, save product cost, and reduce power consumption.

Embodiment 2

The embodiment of the invention provides a capacitive pen, which is applied to an electronic device with a touch panel, and to the capacitive pen system of the first embodiment.

5 and FIG. 6 , wherein FIG. 5 is a schematic perspective view of the capacitive pen in the embodiment, and FIG. 6 is a cross-sectional view of the capacitive pen in the embodiment, the capacitive pen includes a pen body 3 and is mounted on The active electrode module 301 of the head of the pen body 3, the passive sensing module 302 installed at the tail of the pen body, and the control module 303 and the wireless communication module 304 installed in the inner cavity of the pen body 3;

In this embodiment, the active electrode module 301 is used to indicate the position of the active electrode 3011 on the touch panel of the electronic device, and the click or write operation can be performed in the electronic device. Specifically, the active electrode module 301 includes an active electrode 3011, a pressure detecting unit 3012, and a signal generating unit 3013. When the active electrode 3011 contacts the touch panel of the electronic device, the pressure detecting unit 3012 detects the active electrode 3011. The control module 303 controls the signal generating unit 3013 to generate an electrical signal and transmits the electrical signal through the active electrode 3011. When the electronic device detects the electrical signal, the electronic device can correspondingly Perform a click or write operation.

The passive sensing module 302 includes a passive electrode (not shown) for simulating a touch operation of the user's finger, indicating the position of the passive electrode on the touch panel. Specifically, the passive sensing module 302 can be in the electronic device. Performing an erasing operation, when the passive electrode contacts the touch panel of the electronic device, on the one hand, the passive sensing module 302 detects the pressure received by the passive electrode, and transmits the pressure detection result to the control module 303 to confirm the passive The electrode is in contact with the touch panel of the electronic device, and the control module 303 controls the wireless communication module 304 to transmit the pressure detection result to the electronic device, and the electronic device detects the contact point between the passive electrode and the touch panel of the electronic device. Position coordinates, the electronic device performs a corresponding erase operation after receiving the pressure detection result and obtaining the position coordinates.

In this embodiment, the passive electrode of the passive sensing module can be installed in the pen tail position of the capacitive pen by a fixed manner, or can be sleeved at the end of the pen of the capacitive pen as a detachable cap, FIG. 6 and FIG. Two arrangements of passive electrode sockets of the passive sensing module are shown in FIG.

Optionally, the passive sensing module 302 includes one of the following pressure sensors: a piezoresistive pressure sensor, Capacitive pressure sensor, inductive pressure sensor and piezoelectric pressure sensor.

In one embodiment of the present embodiment, the pressure sensor used in the passive sensing module 302 is a resistance strain gauge pressure sensor, and the resistance strain gauge of the resistance strain gauge pressure sensor is attached to the passive electrode. When the passive electrode is displaced or deformed by the pressure, the resistance strain gauge is deformed accordingly, and the corresponding pressure detection result can be obtained according to the resistance value change of the resistance strain gauge.

In another aspect of the embodiment, the passive sensing module 302 includes a pressure sensing electrode, and the pressure sensing electrode forms a capacitance with the passive electrode. When the passive electrode is displaced or deformed by pressure, The passive sensing module 302 will obtain a capacitance value or a capacitance change value of the capacitor, thereby obtaining a corresponding pressure detection result.

In other aspects of the embodiment, the passive sensing module 302 can also use other types of pressure sensors, such as a semiconductor strain gauge pressure sensor, a piezoresistive pressure sensor, an inductive pressure sensor, and the like.

In this embodiment, the wireless communication module 304 is a Bluetooth module.

In this embodiment, as shown in FIG. 8 , the capacitive pen further includes a power supply module 305 for supplying power to other modules. Optionally, when the time when the capacitive pen is in an unused state exceeds a preset duration, the The control module 303 controls the power supply module 305 to stop power supply.

Optionally, as shown in FIG. 9, the capacitive pen further includes a switch module 306 for controlling the opening and closing of the capacitive pen by controlling power supply and power-off of the power supply module 305. Optionally, the capacitive pen further includes a hook 307.

According to the capacitive pen provided by the embodiment of the present invention, the passive sensing module is included in the end of the capacitive pen, the passive sensing module includes a passive electrode, and the passive sensing module detects the passive electrode when the passive electrode contacts the touch panel of the electronic device. The pressure received by the passive electrode is obtained, so that the user's intention of erasing operation is obtained according to the detection result, and the intention of the erasing operation is transmitted to the electronic device through the wireless communication module, and the electronic device directly performs the erasing operation, compared with the prior art. The technical solution of the embodiment of the invention does not need to install an active transmitting module at the end of the capacitive pen, which can simplify the structural design, save product cost, and reduce power consumption.

Embodiment 3

The embodiment of the invention provides a capacitive pen control circuit, which can be applied to the capacitive pen system of the first embodiment and the capacitive pen of the second embodiment.

Referring to the structural block diagram of the capacitive pen control circuit shown in FIG. 10, the capacitive pen control circuit includes an active electrode circuit unit 401, a passive sensing circuit unit 402, a main control circuit unit 403, and a wireless communication circuit unit 404. The first input end and the second input end of the control circuit unit 401 are respectively connected to the output ends of the active electrode circuit unit 401 and the passive sensing circuit unit 402, and the first output end and the second output end of the main control circuit unit 401 Connecting the active electrode circuit unit 401 and the input end of the wireless communication circuit unit 404, respectively, the passive sensing circuit The element 402 is for outputting a pressure detection signal and outputting to the main control circuit unit 403, the main control circuit unit 403 transmitting the pressure detection signal to the external electronic device through the wireless communication circuit unit 404 to control the electronic The device's erase operation.

Specifically, as shown in FIG. 11, the active electrode circuit unit 401 includes an active electrode 4011, a pressure detecting subunit 4012, and a signal generating subunit 4013. When the active electrode 4011 contacts a touch panel of an electronic device, the pressure The detecting sub-unit 4012 detects the pressure of the active electrode 4011. When the pressure is detected, a piezoelectric signal is generated and sent to the main control circuit unit 403, and the main control circuit unit 403 receives the piezoelectric signal and sends a control signal to The signal generating unit 4013 controls the signal generating unit 4013 to generate an electrical signal, and transmits the electrical signal through the active electrode 4011, and when the electronic device detects the electrical signal, the electronic device can perform a click or write operation accordingly.

The passive sensing circuit unit 402 includes a coupled passive electrode (not shown) and a pressure sensing sub-circuit unit (not shown), and the output of the pressure sensing sub-circuit unit is connected to the main control circuit unit. a second input end, wherein the passive electrode is used to simulate a touch operation of a user's finger, indicating a position of the passive electrode on the touch panel, and the passive sensing circuit unit 402 can perform an erase operation in the electronic device, Specifically, when the passive electrode contacts the touch panel of the electronic device, the passive sensing circuit unit 402 detects the pressure received by the passive electrode, and transmits the pressure detection result to the main control circuit unit 403 to confirm the passive electrode and The touch panel of the electronic device is in a contact state, and the main control circuit unit 403 sends a control signal to the wireless communication circuit unit 404, and the control wireless communication circuit unit 404 transmits the pressure detection result to the electronic device, so that the electronic device detects Position coordinates of the contact point of the passive electrode and the touch panel of the electronic device, and receiving the pressure detection After the result, the corresponding erase operation is performed.

The pressure sensing sub-circuit unit may adopt a specific pressure sensor, and the pressure sensor includes any one of the following: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.

In one aspect of the embodiment, the pressure sensor used in the pressure sensing sub-circuit unit is a resistance strain gauge pressure sensor, and the resistance strain gauge of the resistance strain gauge pressure sensor is attached to the passive electrode. When the passive electrode is displaced or deformed by the pressure, the resistance strain gauge is deformed accordingly, and the corresponding pressure detection result can be obtained according to the resistance value change of the resistance strain gauge.

In another aspect of the embodiment, the pressure sensing sub-circuit unit includes a pressure sensing electrode, and the pressure sensing electrode forms a capacitance with the passive electrode, and when the passive electrode is displaced or deformed by pressure The pressure sensing sub-circuit unit will obtain a capacitance value or a capacitance change value of the capacitance, thereby obtaining a corresponding pressure detection result.

In other aspects of the embodiment, the pressure sensing sub-circuit unit may also employ other types of pressure sensors, such as a semiconductor strain gauge pressure sensor, a piezoresistive pressure sensor, an inductive pressure sensor, and the like.

In this embodiment, as shown in FIG. 12, the capacitive pen control circuit further includes a power supply circuit unit 405, the power supply circuit unit and the active electrode circuit unit, the passive induction circuit unit, the main control circuit unit, and the wireless The communication circuit unit is connected, and the main control circuit unit 403 can send control to the power supply circuit unit 405 to control the power supply or power-off of the power supply circuit unit 405, thereby controlling the opening and closing of the capacitance pen.

Optionally, as shown in FIG. 13, the capacitive pen control circuit further includes a switch circuit unit 406, and the switch circuit unit 406 controls power supply or power-off of the power supply circuit unit 405, thereby controlling the opening of the capacitive pen and shut down.

In this embodiment, the main control circuit includes a control chip, and the wireless communication circuit module includes a Bluetooth chip.

In some other examples, the wireless communication circuit unit can be replaced by a wired communication circuit unit.

In a further embodiment, the passive sensing module is detachably mounted to the pen body or partially detachably mounted. In one example, the passive sensing module may include a separate wireless communication unit for communicating with the main control circuit of the active pen or the main control circuit of the touch screen device in addition to the pressure detector. The pressure signal for erasing the intent is transmitted, in which case the passive sensing module acts as an electronic eraser that is separate from the capacitive pen.

According to the capacitor pen control circuit provided by the embodiment of the invention, the active electrode circuit unit and the passive sensing circuit unit are controlled by the main control circuit, and the active writing and passive erasing control of the capacitor pen end can be realized, so that the capacitive pen using the circuit does not need to be Additional active electrode emitters can be added to streamline circuit design, saving product cost while reducing power consumption.

It is apparent that the above-described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, and the preferred embodiments of the present invention are shown in the drawings, but do not limit the scope of the invention. The present invention may be embodied in many different forms and, <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or equivalently replace some of the technical features. . The equivalent structures made by using the description of the present invention and the contents of the drawings are directly or indirectly applied to other related technical fields, and are equally within the scope of the patent protection of the present invention.

Claims

A capacitive pen system, characterized in that the capacitive pen system comprises:

a capacitive pen and an electronic device;

The capacitive pen includes an active electrode module, a passive sensing module, a first control module, and a first wireless communication module, the active electrode module includes an active electrode, and the passive sensing module includes a passive electrode;

The electronic device includes a touch position detecting module, a second control module, a second wireless communication module, and an operation execution module;

The touch position detecting module detects an electrical signal emitted by the active electrode, the second control module determines a position coordinate of a contact point of the active electrode with the electronic device, and controls the operation execution module to perform a writing or clicking operation ;

The touch position detecting module detects a touch of the passive electrode, the second control module determines a position coordinate of a contact point of the passive electrode and the electronic device, and the passive sensing module detects a pressure received by the passive electrode, the first a control module controls the first wireless communication module to send a pressure detection result to the second wireless communication module, and transmits the result to the second control module, where the second control module controls the location according to the position coordinate and the pressure detection result The operation execution module performs an erase operation.
The capacitive pen system according to claim 1, wherein the passive sensing module comprises one of a pressure sensor: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor. .
The capacitive pen system according to any one of claims 1 to 4, wherein the first wireless communication module and the second wireless communication module are Bluetooth modules.
The capacitive pen system according to any one of claims 1 to 3, wherein the first control module is further configured to determine whether the pressure value detected by the passive sensing module is greater than a preset threshold, when the detected When the pressure value is greater than the preset threshold, the pressure detection result is sent to the electronic device by the first wireless communication module.
The capacitive pen system according to any one of claims 1 to 3, wherein the capacitive pen further comprises a power supply module, wherein the first control module is further configured to determine the active electrode and the passive electrode and the electronic device Whether the length of time that the device is not in contact is greater than a preset threshold, and when the length of the non-contact is greater than a preset threshold, the power supply module of the first control module is turned off.
A capacitive pen is applied to an electronic device with a touch panel, comprising: a pen body, an active electrode module mounted on the head of the pen body, a passive sensing module installed at the tail of the pen body, and being installed in the pen body Cavity control module, wireless communication module;

The active electrode module includes an active electrode for indicating a position on the touch panel;

The passive sensing module includes a passive electrode for simulating a touch operation of a user's finger, indicating the touch panel a position on the upper side, and detecting a pressure applied to the passive electrode;

The control module controls the wireless communication module to send the pressure detection result acquired by the passive sensing module to the electronic device for controlling the erasing operation of the electronic device.
The capacitive pen according to claim 6, wherein the passive sensing module comprises one of a pressure sensor: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.
The capacitive pen according to claim 6, wherein the wireless communication module is a Bluetooth module.
The capacitive pen according to any one of claims 6-8, wherein the capacitive pen further comprises a power supply module, and the first control module controls opening and closing of the power supply module.
The capacitive pen according to claim 9, wherein said capacitive pen further comprises a switch module for controlling opening and closing of said power supply module.
The capacitive pen according to claim 6, wherein said passive sensing module is detachably mounted to said pen body.
A capacitive pen control circuit, characterized in that the capacitive pen control circuit comprises an active electrode circuit unit, a passive sensing circuit unit, a main control circuit unit, a wireless communication circuit unit, a first input end of the main control circuit unit and The second input end is respectively connected to the output ends of the active electrode circuit unit and the passive sensing circuit unit, and the first output end and the second output end of the main control circuit unit are respectively connected to the active electrode circuit unit and the wireless communication circuit unit Input terminal, the passive sensing circuit unit is configured to output a pressure detection signal to the main control circuit unit, and the main control circuit unit sends the pressure detection signal to the external electronic device through the wireless communication circuit unit To control the erase operation of the electronic device.
The stylus pen control circuit according to claim 12, wherein the passive sensing circuit unit comprises a coupled passive electrode and a pressure sensing sub-circuit unit, and an output of the pressure sensing sub-circuit unit is connected to the main Control the second input of the circuit unit.
The capacitive pen control circuit according to claim 12, wherein said wireless communication circuit unit comprises a Bluetooth chip.
The stylus pen control circuit according to any one of claims 12-14, wherein the stylus pen control circuit further comprises a power supply circuit unit, the power supply circuit unit is connected to the main control circuit unit, and the main control The circuit unit sends a control signal to control the power supply circuit unit to supply or power off.
The capacitive pen control circuit according to claim 15, wherein the capacitive pen control circuit further comprises a switch circuit unit, wherein the switch circuit unit is connected to the power supply circuit unit to control power supply of the power supply circuit unit Or power off.