Active capacitance pen and terminal system

Abstract

The utility model discloses an active capacitance pen and a terminal system, and relates to the technical field of capacitance pens. The active capacitance pen comprises a pressure acquisition circuit, a fingerprint acquisition circuit, a Bluetooth module and a control circuit. When the fingerprint acquisition circuit is triggered by a user, fingerprint information of the user is acquired, and the control circuit matches the fingerprint information with preset fingerprint information. When the matching is successful, a first signal is sent to the terminal equipment through the Bluetooth module, and the first signal comprises unlocking information and / or jump information. If yes, the terminal equipment can be unlocked, and / or the terminal equipment jumps to a writing or drawing page. When the pen point touches the screen of the terminal equipment, the fingerprint acquisition circuit can acquire pen point pressure information, and when matching succeeds, the pen point pressure information is sent to the screen. And when the matching fails, not sending. Therefore, the fluency of the active capacitance pen matched with the terminal equipment in use is improved, and the use safety of the active capacitance pen matched with the terminal equipment in use is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitive pens, in particular to an active capacitive pen and a terminal system. Background Art

[0002] With the popularization of electronic products, active capacitive pens are being used more and more widely in conjunction with terminal devices such as tablets and other electronic products.

[0003] However, before using an active capacitive pen to write or draw on the tablet screen, the user often needs to unlock the tablet first, and then jump to the corresponding writing or drawing page to write or draw. This series of operations is cumbersome and easily interrupts the user's creative or recording inspiration, affecting the overall smoothness of the user experience. Utility Model Content

[0004] The main purpose of the utility model is to provide an active capacitive stylus, aiming to improve the overall fluency of the active capacitive stylus when used in conjunction with a terminal device.

[0005] To achieve the above-mentioned purpose, the active capacitive stylus proposed by the present invention is applied to a terminal system, wherein the terminal system includes a terminal device, and the active capacitive stylus includes:

[0006] A pressure collection circuit, the pressure collection circuit is used to collect pen tip pressure information when the pen tip touches the screen of the terminal device;

[0007] A fingerprint collection circuit, wherein the fingerprint collection circuit is used to collect fingerprint information of the user when triggered by the user;

[0008] A Bluetooth module, the Bluetooth module is communicatively connected with the terminal device;

[0009] A control circuit, wherein the control circuit is electrically connected to the pressure acquisition circuit, the fingerprint acquisition circuit and the Bluetooth module respectively, and the control circuit is used to receive the fingerprint information and the pen tip pressure information, and when the fingerprint information successfully matches the preset fingerprint information, send a first signal and the pen tip pressure information to the terminal device.

[0010] In one embodiment, the active capacitive stylus also includes a key circuit, which is electrically connected to the control circuit. When the key circuit is triggered by a user, it inputs a control signal to the control circuit; the control circuit is also used to work according to the control signal.

[0011] In one embodiment, the active capacitive pen further includes an indicator light circuit, which is electrically connected to the control circuit, and is used to display different colors when the fingerprint information successfully or fails to match the preset fingerprint information.

[0012] In one embodiment, the active capacitive pen further includes a voltage conversion circuit, which is electrically connected to the fingerprint acquisition circuit and the control circuit respectively, and is used to convert the external power supply voltage and output it.

[0013] In one embodiment, the pressure acquisition circuit includes a pressure sensor, and the pressure sensor includes a first pressure-sensing resistor, a second pressure-sensing resistor, a third pressure-sensing resistor, and a fourth pressure-sensing resistor;

[0014] Among them, one end of the first pressure-sensing resistor and one end of the second pressure-sensing resistor are electrically connected to the power supply end of the pressure sensor, the other end of the second pressure-sensing resistor and one end of the fourth pressure-sensing resistor are electrically connected to the first output end of the pressure sensor; the other end of the fourth pressure-sensing resistor and one end of the third pressure-sensing resistor are grounded; the other end of the third pressure-sensing resistor and the other end of the first pressure-sensing resistor are electrically connected to the second output end of the pressure sensor.

[0015] In one embodiment, the fingerprint acquisition circuit includes:

[0016] A fingerprint sensor, which is used to collect fingerprint information of a user and output a fingerprint simulation signal;

[0017] The analog front-end circuit is electrically connected to the fingerprint sensor and the control circuit respectively, and is used to convert the fingerprint analog signal into a fingerprint digital signal output.

[0018] In one embodiment, the fingerprint sensor includes a capacitive fingerprint sensor, and the analog front-end circuit includes an amplifier, an analog-to-digital converter, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, and a third capacitor;

[0019] Among them, the output end of the capacitive fingerprint sensor, one end of the first resistor, and one end of the first capacitor are electrically connected to the inverting input end of the amplifier; the other end of the first resistor, the other end of the first capacitor, and the output end of the amplifier are electrically connected to one end of the second resistor, and the other end of the second resistor, one end of the second capacitor are electrically connected to one end of the third resistor; the other end of the third resistor, one end of the fourth resistor, and one end of the third capacitor are electrically connected to the input end of the analog-to-digital converter; the positive input end of the amplifier, the other end of the second capacitor, the other end of the fourth resistor, and the other end of the third capacitor are grounded; the other end of the analog-to-digital converter is electrically connected to the control circuit.

[0020] In one embodiment, the voltage conversion circuit includes a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first inductor and a voltage conversion chip;

[0021] Among them, one end of the fourth capacitor, one end of the fifth capacitor, one end of the first inductor, the VIN pin of the voltage conversion chip, and the EN pin of the voltage conversion chip are electrically connected to the input end of the voltage conversion circuit; the L pin of the voltage conversion chip is electrically connected to the other end of the first inductor; the VOUT pin of the voltage conversion chip, one end of the fifth resistor, one end of the sixth capacitor, one end of the seventh capacitor, and one end of the eighth capacitor are electrically connected to the output end of the voltage conversion circuit; the other end of the fifth resistor and one end of the sixth resistor are electrically connected to the FB pin of the voltage conversion chip; the other end of the fourth capacitor, the other end of the fifth capacitor, the other end of the sixth resistor, the other end of the sixth capacitor, the other end of the seventh capacitor, and the other end of the eighth capacitor are grounded to the GND pin of the voltage conversion chip.

[0022] In one implementation, the control circuit includes an MCU chip.

[0023] The utility model also provides a terminal system, comprising a terminal device and the active capacitive stylus as described above.

[0024] The technical solution of the utility model adopts an active capacitive pen, including a pressure collection circuit, a fingerprint collection circuit, a Bluetooth module and a control circuit. Among them, when the fingerprint collection circuit is triggered by the user, the user's fingerprint information is collected and a fingerprint signal is output. The control circuit receives the fingerprint signal to parse the fingerprint information and matches it with the preset fingerprint information. When the fingerprint information matches the preset fingerprint information successfully, a first signal is sent to the terminal device through the Bluetooth module, wherein the first signal includes unlocking information and / or jump information. Then the terminal device can be unlocked according to the first signal, and / or jump to the corresponding writing or drawing page for writing or drawing. When the pen tip touches the screen of the terminal device, the fingerprint collection circuit can collect the pen tip pressure information. When the fingerprint information matches the preset fingerprint information successfully, the control circuit sends the pen tip pressure information to the screen in the form of a coding signal. When the fingerprint information fails to match the preset fingerprint information, the pen tip pressure information is not sent. In this way, the utility model can improve the overall fluency of the active capacitive pen used in conjunction with the terminal device, and improve the use safety of the active capacitive pen used in conjunction with the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of an active capacitive stylus pen according to an embodiment of the present invention;

[0027] Figure 2 A structural schematic diagram of another embodiment of the active capacitive stylus provided by the utility model;

[0028] Figure 3 A product schematic diagram of an active capacitive stylus pen according to an embodiment of the present invention;

[0029] Figure 4 An electronic circuit diagram of a pressure sensor of an active capacitive stylus according to an embodiment of the present invention;

[0030] Figure 5 An electronic circuit diagram of a fingerprint collection circuit of an active capacitive pen according to an embodiment of the present invention;

[0031] Figure 6 This is an electronic circuit diagram of a voltage conversion circuit of an active capacitive stylus provided by the utility model.

[0032] Description of Figure Numbers:

[0033]

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] In the usage scenarios of existing active capacitive pens with terminal devices such as tablets and other electronic products, before using the active capacitive stylus to write or draw on the tablet screen, the user often needs to unlock the tablet first, and then jump to the corresponding writing or drawing page to write or draw. This series of operation processes is cumbersome and easily interrupts the user's creative or recording inspiration, affecting the overall smoothness of the user experience.

[0039] In order to solve the above problems, the present invention provides an active capacitive stylus 100 .

[0040] See also Figure 1 In one embodiment of the utility model, the active capacitive stylus 100 is applied to a terminal system, the terminal system includes a terminal device 200, and the active capacitive stylus 100 includes:

[0041] A pressure collection circuit 110, which is used to collect pen tip pressure information when the pen tip touches the screen of the terminal device 200;

[0042] In this embodiment, the pressure acquisition circuit 110 may include a pressure sensor 111, a signal conditioning circuit and an analog-to-digital conversion circuit. The pressure sensor 111 may sense the pressure applied by the pen tip on the screen, and the signal conditioning circuit may amplify and filter the pressure signal obtained from the pressure sensor 111. The analog-to-digital converter U2 may convert the analog signal into a digital signal for further signal processing and analysis by the control circuit 140.

[0043] A fingerprint collection circuit 120, the fingerprint collection circuit 120 is used to collect the user's fingerprint information when triggered by the user;

[0044] In this embodiment, the fingerprint acquisition circuit 120 may include an optical sensor, a capacitive sensor, an ultrasonic sensor, or a thermal sensor to identify the fingerprint information, and then amplify, filter, and convert the fingerprint information into analog-to-digital information before outputting it to the control circuit 140 for further signal processing and analysis.

[0045] A Bluetooth module 130, the Bluetooth module 130 is connected to the terminal device 200 for communication;

[0046] In this embodiment, the Bluetooth module 130 may include a Bluetooth chip, an antenna, a filter, and a matching network. The core processing unit of the Bluetooth chip is used to execute the Bluetooth protocol stack and wireless communication functions, and the radio frequency circuit of the Bluetooth chip is used to send / receive Bluetooth signals through the antenna. The filter and the matching network can be used to filter out interference signals and perform impedance matching to improve communication quality and efficiency.

[0047] The control circuit 140 is electrically connected to the pressure acquisition circuit 110, the fingerprint acquisition circuit 120 and the Bluetooth module 130 respectively. The control circuit 140 is used to receive fingerprint information and pen tip pressure information, and when the fingerprint information successfully matches the preset fingerprint information, send a first signal and the pen tip pressure information to the terminal device 200.

[0048] Please note that Figure 3 The capacitive pen of this embodiment may include a housing, on which a pen tip area and a fingerprint area are provided. The pen tip area is built with a pen tip electrode and a pressure collection circuit 110. When the pen tip touches the screen, the pressure collection circuit 110 can collect the pen tip pressure information. The control circuit 140 receives the pen tip pressure information and converts it into a coding signal, and sends the coding signal to the screen of the terminal device 200 through the pen tip electrode. The fingerprint area is built with a fingerprint collection circuit 120. When the user's finger is placed in the fingerprint area, the fingerprint collection circuit 120 can collect the user's fingerprint information.

[0049] In this embodiment, when the fingerprint acquisition circuit 120 is triggered by the user, the user's fingerprint information is collected and a fingerprint signal is output. The control circuit 140 receives the fingerprint signal to parse the fingerprint information and matches it with the preset fingerprint information. When the fingerprint information matches the preset fingerprint information successfully, a first signal is sent to the terminal device 200 through the Bluetooth module 130, wherein the first signal includes unlocking information and / or jump information. The terminal device 200 can be unlocked according to the first signal, and / or jump to the corresponding writing or drawing page for writing or drawing. When the pen tip touches the screen of the terminal device 200, the fingerprint acquisition circuit 120 can collect the pen tip pressure information. When the match is successful, the control circuit 140 sends the pen tip pressure information to the screen in the form of a coding signal, which can improve the overall fluency of the active capacitive pen 100 used in conjunction with the terminal device 200. When the match is unsuccessful, the pen tip pressure information is not sent. In this way, this embodiment can improve the overall fluency of the active capacitive pen 100 used in conjunction with the terminal device 200, and improve the safety of the use of the active capacitive pen 100.

[0050] In the present utility model, when the fingerprint acquisition circuit 120 is triggered by the user, the user's fingerprint information is collected and a fingerprint signal is output. The control circuit 140 receives the fingerprint signal to parse the fingerprint information and matches it with the preset fingerprint information. When the fingerprint information matches the preset fingerprint information successfully, a first signal is sent to the terminal device 200 through the Bluetooth module 130, wherein the first signal includes unlocking information and / or jump information. Then the terminal device 200 can be unlocked according to the first signal, and / or jump to the corresponding writing or drawing page for writing or drawing. When the pen tip touches the screen of the terminal device 200, the fingerprint acquisition circuit 120 can collect the pen tip pressure information. When the match is successful, the control circuit 140 sends the pen tip pressure information to the screen in the form of a coding signal, which can improve the overall fluency of the active capacitive pen 100 used in conjunction with the terminal device 200. When the match fails, the pen tip pressure information is not sent. In this way, the present utility model can improve the overall fluency of the active capacitive pen 100 used in conjunction with the terminal device 200, and improve the safety of the use of the active capacitive pen 100.

[0051] See also Figure 2 In one embodiment of the utility model, the active capacitive stylus 100 further includes a key circuit 150, which is electrically connected to the control circuit 140. The key circuit 150 is used to input a control signal to the control circuit 140 when triggered by a user; the control circuit 140 is also used to work according to the control signal.

[0052] Please note that Figure 3 A key area is provided on the shell, and a key circuit 150 is built in the key area.

[0053] In this embodiment, when the key circuit 150 is triggered by the user, a control signal is input. The control circuit 140 can receive the control signal and work according to the control signal. For example, the power on / off operation can be triggered, and the control circuit 140 controls the power on / off. The fingerprint pre-collection mode can be triggered, and the control circuit 140 controls entering the fingerprint pre-collection mode. In this mode, the user can obtain complete preset fingerprint information by triggering the fingerprint collection circuit 120 multiple times. Among them, the key circuit 150 can be set with two key switches, the first key switch is used to control the power on / off operation, and the second key switch is used to enter / exit the fingerprint pre-collection mode. The key circuit 150 can also be set with the same key switch, and different operations can be performed by pressing the key for different times or different pressing times, which is not limited here.

[0054] See also Figure 2In one embodiment of the utility model, the active capacitive stylus 100 further includes an indicator light circuit 160, which is electrically connected to the control circuit 140. The indicator light circuit 160 is used to display different colors when the fingerprint information successfully or unsuccessfully matches the preset fingerprint information.

[0055] Please note that Figure 3 An indicator light area is provided on the shell, and an indicator light circuit 160 is built in the indicator light area.

[0056] In this embodiment, when the fingerprint information matches successfully, the indicator light may display green, and when the fingerprint information matches unsuccessfully, the indicator light may display red. Among them, the indicator light circuit may include a green light emitting diode and a red light emitting diode. It is understandable that. In the fingerprint pre-collection mode, the indicator light may be controlled to display red and flash to prompt the user to enter the fingerprint. When the user enters the complete fingerprint, the indicator light may be controlled to display green to prompt the user that the complete preset fingerprint information has been entered.

[0057] See also Figure 6 In one embodiment of the utility model, the active capacitive stylus 100 further includes a voltage conversion circuit 170, which is electrically connected to the fingerprint collection circuit 120 and the control circuit 140 respectively. The voltage conversion circuit 170 is used to convert the external power supply voltage and output it.

[0058] It should be noted that a lithium-ion battery can be provided inside the active capacitive stylus 100 , and the voltage conversion circuit 170 can convert the voltage output by the lithium-ion battery into the operating voltage of the fingerprint acquisition circuit 120 and the control circuit 140 to facilitate the normal operation of the fingerprint acquisition circuit 120 and the control circuit 140 .

[0059] See also Figure 4 In one embodiment of the present utility model, the pressure acquisition circuit 110 includes a pressure sensor 111, and the pressure sensor 111 includes a first pressure sensing resistor RV1, a second pressure sensing resistor RV2, a third pressure sensing resistor RV3 and a fourth pressure sensing resistor RV4;

[0060] Among them, one end of the first pressure-sensing resistor RV1 and one end of the second pressure-sensing resistor RV2 are electrically connected to the power supply end of the pressure sensor 111, and the other end of the second pressure-sensing resistor RV2 and one end of the fourth pressure-sensing resistor RV4 are electrically connected to the first output end of the pressure sensor 111; the other end of the fourth pressure-sensing resistor RV4 and one end of the third pressure-sensing resistor RV3 are grounded; the other end of the third pressure-sensing resistor RV3 and the other end of the first pressure-sensing resistor RV1 are electrically connected to the second output end of the pressure sensor 111.

[0061] In this embodiment, when the pen tip touches the screen, the pressure sensor 111 senses the pressure, and the resistance values ​​of the first pressure sensing resistor RV1, the second pressure sensing resistor RV2, the third pressure sensing resistor RV3 and the fourth pressure sensing resistor RV4 change, resulting in a change in the output pressure signal.

[0062] In this embodiment, the pressure acquisition circuit 110 may also include a signal conditioning circuit and an analog-to-digital conversion circuit. The pressure sensor 111, the signal conditioning circuit and the analog-to-digital conversion circuit are electrically connected in sequence. The pressure signal output by the pressure sensor 111 can be amplified and filtered by the signal conditioning circuit and the analog-to-digital conversion circuit, and converted into a digital signal to be input to the control circuit 140. The control circuit 140 can generate a coding signal based on the pressure information of the pressure signal, and then transmit it to the screen of the terminal device 200 through the pen tip electrode.

[0063] See also Figure 5 In one embodiment of the present utility model, the fingerprint collection circuit 120 includes:

[0064] Fingerprint sensor 121, the fingerprint sensor 121 is used to collect the user's fingerprint information and output a fingerprint simulation signal;

[0065] The analog front-end circuit 122 is electrically connected to the fingerprint sensor 121 and the control circuit 140 respectively. The analog front-end circuit 122 is used to convert the fingerprint analog signal into a fingerprint digital signal for output.

[0066] In this embodiment, when the user places the finger on the fingerprint sensor 121, the fingerprint sensor 121 captures the subtle features of the user's fingerprint through its sensing area, including information such as the lines, bifurcation points, and termination points of the fingerprint. Among them, the fingerprint sensor 121 can be a sensor such as an optical sensor, a capacitive sensor, or an ultrasonic sensor. The technical principles of optics, capacitance, ultrasound, etc., generate corresponding electrical signals, i.e., fingerprint simulation signals, according to the changes in physical properties caused by the unevenness of the fingerprint. The generated fingerprint simulation signals are then transmitted to the analog front-end circuit 122 to pre-process these analog signals, including operations such as amplification and filtering, to remove noise and optimize signal quality, and convert the continuously changing analog signals into discrete digital signals, which can be achieved by regularly sampling the voltage value of the analog signal and quantizing it into a digital value. The converted digital signal is then output to the control circuit 140. The control circuit 140 can further process these data, such as extracting, analyzing, and comparing fingerprint feature points through a specific algorithm, and matching the fingerprint feature points with the fingerprint feature points of the preset fingerprint information. If the match is successful, the authentication is passed, and if the match fails, the authentication is not passed.

[0067] See also Figure 5In one embodiment of the utility model, the fingerprint sensor 121 includes a capacitive fingerprint sensor U1, and the analog front-end circuit 122 includes an amplifier OP, an analog-to-digital converter U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, and a third capacitor C3;

[0068] Among them, the output end of the capacitive fingerprint sensor U1, one end of the first resistor R1, and one end of the first capacitor C1 are electrically connected to the inverting input end of the amplifier OP; the other end of the first resistor R1, the other end of the first capacitor C1, and the output end of the amplifier OP are electrically connected to one end of the second resistor R2, and the other end of the second resistor R2, one end of the second capacitor C2 are electrically connected to one end of the third resistor R3; the other end of the third resistor R3, one end of the fourth resistor R4, and one end of the third capacitor C3 are electrically connected to the input end of the analog-to-digital converter U2; the non-inverting input end of the amplifier OP, the other end of the second capacitor C2, the other end of the fourth resistor R4, and the other end of the third capacitor C3 are grounded; the other end of the analog-to-digital converter U2 is electrically connected to the control circuit 140.

[0069] In this embodiment, the amplifier OP can amplify the collected fingerprint signal, and the first capacitor C1 and the first resistor R1 together with the amplifier OP constitute the feedback circuit of the amplifier OP, which can adjust the gain of the amplifier OP. The second resistor R2 and the second capacitor C2 constitute a low-pass filter, which can filter out high-frequency components to reduce high-frequency noise or interference in the fingerprint signal, and help improve the anti-interference ability of the signal. The third resistor R3, the fourth resistor R4, and the third capacitor C3 constitute a sampling and holding circuit, and the sampling and holding circuit can convert the fingerprint signal into a form that can be processed by the analog-to-digital converter U2. The resistance values ​​of the third resistor R3 and the fourth resistor R4 can be adjusted according to the acquisition range of the analog-to-digital converter U2. Among them, the voltage value at both ends of the fourth resistor R4 changes according to the voltage change of the fingerprint signal, the third capacitor C3 can play a filtering role, and the analog-to-digital converter U2 can convert the input analog signal into a digital signal output.

[0070] See also Figure 6 In one embodiment of the utility model, the voltage conversion circuit 170 includes a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a first inductor L1 and a voltage conversion chip U3;

[0071] Among them, one end of the fourth capacitor C4, one end of the fifth capacitor C5, one end of the first inductor L1, the VIN pin of the voltage conversion chip U3, and the EN pin of the voltage conversion chip U3 are electrically connected to the input end of the voltage conversion circuit 170; the L pin of the voltage conversion chip U3 is electrically connected to the other end of the first inductor L1; the VOUT pin of the voltage conversion chip U3, one end of the fifth resistor R5, one end of the sixth capacitor C6, one end of the seventh capacitor C7, and one end of the eighth capacitor C8 are electrically connected to the output end of the voltage conversion circuit 170; the other end of the fifth resistor R5 and one end of the sixth resistor R6 are electrically connected to the FB pin of the voltage conversion chip U3; the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, the other end of the sixth resistor R6, the other end of the sixth capacitor C6, the other end of the seventh capacitor C7, and the other end of the eighth capacitor C8 are grounded to the GND pin of the voltage conversion chip U3.

[0072] In this embodiment, the first voltage conversion circuit 170 can convert the external power supply voltage into a 3.3V voltage output, which can provide power to the fingerprint collection circuit 120 and the control circuit 140 respectively.

[0073] In an embodiment of the present invention, the control circuit 140 includes an MCU chip.

[0074] In this embodiment, the MCU chip can integrate a processor, a memory, an input interface, an output interface, and various communication interfaces, which can reduce the demand for peripheral components such as analog-to-digital converters. In this embodiment, the MCU chip supports multiple communication protocols, and the MCU chip has low power consumption and good stability, which is suitable for the use scenario of the active capacitive stylus 100 in conjunction with the terminal device 200.

[0075] The utility model also proposes a terminal system, which includes a terminal device 200 and an active capacitive stylus 100. The specific structure of the active capacitive stylus 100 refers to the above-mentioned embodiment. Since the terminal system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0076] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An active capacitive stylus, characterized in that: The active capacitive stylus is applied to a terminal system, the terminal system includes a terminal device, and the active capacitive stylus includes: A pressure collection circuit, the pressure collection circuit is used to collect pen tip pressure information when the pen tip touches the screen of the terminal device; A fingerprint collection circuit, wherein the fingerprint collection circuit is used to collect fingerprint information of the user when triggered by the user; A Bluetooth module, the Bluetooth module is communicatively connected with the terminal device; A control circuit, wherein the control circuit is electrically connected to the pressure acquisition circuit, the fingerprint acquisition circuit and the Bluetooth module respectively, and the control circuit is used to receive the fingerprint information and the pen tip pressure information, and when the fingerprint information successfully matches the preset fingerprint information, send a first signal and the pen tip pressure information to the terminal device.

2. The active capacitive stylus pen according to claim 1, characterized in that: The active capacitive stylus also includes a key circuit, which is electrically connected to the control circuit. When the key circuit is triggered by a user, it inputs a control signal to the control circuit; the control circuit is also used to work according to the control signal.

3. The active capacitive stylus pen according to claim 1, characterized in that: The active capacitive pen also includes an indicator light circuit, which is electrically connected to the control circuit and is used to display different colors when the fingerprint information successfully or fails to match the preset fingerprint information.

4. The active capacitive stylus pen according to claim 1, characterized in that: The active capacitive pen also includes a voltage conversion circuit, which is electrically connected to the fingerprint collection circuit and the control circuit respectively, and is used to convert the external power supply voltage into a voltage and then output it.

5. The active capacitive stylus pen according to claim 1, characterized in that: The pressure acquisition circuit includes a pressure sensor, and the pressure sensor includes a first pressure-sensing resistor, a second pressure-sensing resistor, a third pressure-sensing resistor and a fourth pressure-sensing resistor; Among them, one end of the first pressure-sensing resistor and one end of the second pressure-sensing resistor are electrically connected to the power supply end of the pressure sensor, the other end of the second pressure-sensing resistor and one end of the fourth pressure-sensing resistor are electrically connected to the first output end of the pressure sensor; the other end of the fourth pressure-sensing resistor and one end of the third pressure-sensing resistor are grounded; the other end of the third pressure-sensing resistor and the other end of the first pressure-sensing resistor are electrically connected to the second output end of the pressure sensor.

6. The active capacitive stylus pen according to claim 1, characterized in that: The fingerprint acquisition circuit comprises: A fingerprint sensor, which is used to collect fingerprint information of a user and output a fingerprint simulation signal; The analog front-end circuit is electrically connected to the fingerprint sensor and the control circuit respectively, and is used to convert the fingerprint analog signal into a fingerprint digital signal output.

7. The active capacitive stylus pen according to claim 6, characterized in that: The fingerprint sensor includes a capacitive fingerprint sensor, and the analog front-end circuit includes an amplifier, an analog-to-digital converter, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, and a third capacitor; Among them, the output end of the capacitive fingerprint sensor, one end of the first resistor, and one end of the first capacitor are electrically connected to the inverting input end of the amplifier; the other end of the first resistor, the other end of the first capacitor, and the output end of the amplifier are electrically connected to one end of the second resistor, and the other end of the second resistor, one end of the second capacitor are electrically connected to one end of the third resistor; the other end of the third resistor, one end of the fourth resistor, and one end of the third capacitor are electrically connected to the input end of the analog-to-digital converter; the positive input end of the amplifier, the other end of the second capacitor, the other end of the fourth resistor, and the other end of the third capacitor are grounded; the other end of the analog-to-digital converter is electrically connected to the control circuit.

8. The active capacitive stylus pen as claimed in claim 4, characterized in that: The voltage conversion circuit includes a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first inductor and a voltage conversion chip; Among them, one end of the fourth capacitor, one end of the fifth capacitor, one end of the first inductor, the VIN pin of the voltage conversion chip, and the EN pin of the voltage conversion chip are electrically connected to the input end of the voltage conversion circuit; the L pin of the voltage conversion chip is electrically connected to the other end of the first inductor; the VOUT pin of the voltage conversion chip, one end of the fifth resistor, one end of the sixth capacitor, one end of the seventh capacitor, and one end of the eighth capacitor are electrically connected to the output end of the voltage conversion circuit; the other end of the fifth resistor and one end of the sixth resistor are electrically connected to the FB pin of the voltage conversion chip; the other end of the fourth capacitor, the other end of the fifth capacitor, the other end of the sixth resistor, the other end of the sixth capacitor, the other end of the seventh capacitor, and the other end of the eighth capacitor are grounded to the GND pin of the voltage conversion chip.

9. The active capacitive stylus pen according to claim 1, wherein: The control circuit includes an MCU chip.

10. A terminal system, characterized in that: It comprises a terminal device and an active capacitive stylus as claimed in any one of claims 1 to 9.

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