WO2017214820A1 - 触摸检测电路、指纹模组及其控制方法 - Google Patents

触摸检测电路、指纹模组及其控制方法 Download PDF

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Publication number
WO2017214820A1
WO2017214820A1 PCT/CN2016/085613 CN2016085613W WO2017214820A1 WO 2017214820 A1 WO2017214820 A1 WO 2017214820A1 CN 2016085613 W CN2016085613 W CN 2016085613W WO 2017214820 A1 WO2017214820 A1 WO 2017214820A1
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WIPO (PCT)
Prior art keywords
fingerprint
touch detection
detection circuit
processing unit
switch
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PCT/CN2016/085613
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English (en)
French (fr)
Inventor
杜灿鸿
易福建
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深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201680000665.XA priority Critical patent/CN106462751A/zh
Priority to PCT/CN2016/085613 priority patent/WO2017214820A1/zh
Priority to KR1020177026732A priority patent/KR20180014682A/ko
Priority to EP16892937.0A priority patent/EP3285204A4/en
Publication of WO2017214820A1 publication Critical patent/WO2017214820A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches

Definitions

  • the present invention relates to the field of fingerprint recognition technologies, and in particular, to a touch detection circuit, a fingerprint module, and a control method thereof.
  • a fingerprint module is usually disposed under the screen of the smart terminal device.
  • the fingerprint module generally has a touch detection function. That is, the fingerprint module can determine the touch event by determining whether the finger fingerprint is detected.
  • the size of the smart terminal device itself is limited, the size of the current fingerprint module is generally small, and the fingerprint sensor is usually smaller than the size of the finger; if the finger is not placed in place, it is likely to be detected; that is, the finger detection blind zone is easily formed, and the detection is easy. The accuracy of touch detection.
  • the object of the present invention is to provide a touch detection circuit, a fingerprint module and a control method thereof, which use the metal decoration component and the fingerprint sensor to jointly detect, thereby expanding the overall detection range of the fingerprint module, thereby reducing the detection dead zone of the finger and improving The detection accuracy of the fingerprint module when the touch detection function is implemented.
  • an embodiment of the present invention provides a fingerprint module, which specifically includes: a fingerprint sensor, a metal decoration member, a touch detection circuit, and a processing unit; a touch ring is disposed on the fingerprint sensor; the touch detection circuit is connected to the metal decoration; when the user's finger contacts the metal decoration, the touch detection circuit generates a first trigger signal; the processing unit is connected The touch detection circuit and the fingerprint sensor; wherein, when receiving the first trigger signal generated by the touch detection circuit and/or a fingerprint sensing signal generated by the fingerprint sensor, the processing unit generates a finger Touch the signal.
  • Embodiments of the present invention also provide a touch detection circuit including: a driving signal source, a driving resistor, an operational amplifier, and an analog to digital converter; a first input end of the operational amplifier is coupled to the metal decorative member, The first input terminal is further connected to the driving signal source through the driving resistor; an input end of the analog to digital converter is connected to an output end of the operational amplifier, and an output end of the analog to digital converter is connected to the Processing unit.
  • Embodiments of the present invention also provide a touch detection circuit including: a voltage source, a first switch, a second switch, a third switch, a capacitor, an operational amplifier, and an analog to digital converter; the first switch is coupled to the Between the metal garnish and the first input of the operational amplifier, the second switch is connected between the metal garnish and the voltage source; the third switch is connected in parallel with the capacitor An input end of the operational amplifier is coupled to an output of the operational amplifier; an output of the analog-to-digital converter is coupled to the output of the operational amplifier a processing unit; wherein the control ends of the first switch, the second switch, and the third switch respectively receive control signals to achieve opening and closing.
  • An embodiment of the present invention further provides a fingerprint module control method, which is applied to the fingerprint module.
  • the control method of the fingerprint module includes: when the processing unit receives a touch operation signal, the processing unit switches to a touch detection mode; in the touch detection mode, when the processing unit receives the first trigger signal generated by the touch detection circuit and/or the fingerprint sensing signal generated by the fingerprint sensor, the processing unit generates a finger touch signal; When the processing unit receives the fingerprint working signal, the processing unit switches to a fingerprint recognition mode; in the fingerprint recognition mode, the processing unit receives the fingerprint sensing signal generated by the fingerprint sensor and generates a fingerprint image signal number.
  • the metal decorative member is connected to the fingerprint sensor, and the touch detecting circuit is connected to the metal decorative member.
  • the touch detection circuit When a user's finger contacts the metal decorative member, The touch detection circuit generates a first trigger signal, the processing unit is connected to the touch detection circuit and the fingerprint sensor; when receiving the first trigger signal generated by the touch detection circuit and/or the fingerprint sensor The processing unit generates a finger touch signal when the generated fingerprint sense signal.
  • the metal decorative member can be inductively touched by the touch circuit, that is, the metal decorative member and the fingerprint sensor are jointly detected, thereby expanding the overall detection range of the fingerprint module, thereby reducing the detection dead zone of the finger. The detection accuracy of the fingerprint detection when the fingerprint module realizes the touch detection function is improved.
  • the processing unit includes: a fingerprint identification chip; the fingerprint identification chip is connected to the touch detection circuit and the fingerprint sensor; wherein, when the first trigger signal generated by the touch detection circuit is received, Or the fingerprint recognition chip generates the finger touch signal when the fingerprint sensing signal generated by the fingerprint sensor is generated. That is, only the software modification of the fingerprint chip can realize other processing functions; and the touch detection circuit can be integrated with the fingerprint identification chip, and can be packaged as a whole; thereby saving space and facilitating the space. The miniaturization of smart terminal devices.
  • the processing unit includes: a fingerprint identification chip and a microprocessor; the fingerprint identification chip is connected to the fingerprint sensor; the microprocessor is connected to the touch detection circuit and the fingerprint identification chip; Receiving the fingerprint sensing signal, the fingerprint recognition chip generates a second trigger signal; when receiving the first trigger signal and/or the second trigger signal, the microprocessor generates the finger touch signal. That is, a microprocessor for receiving the first trigger signal and/or the second trigger signal is added; therefore, in the implementation of the solution, the existing fingerprint chip can be utilized (ie, the existing fingerprint chip is not used) Make any changes) with the addition of a new microprocessor to complete the entire processing function of the fingerprint module; easy to implement and short manufacturing cycle.
  • the touch detection circuit includes: a driving signal source, a driving resistor, an operational amplifier, and an analog-to-digital converter; a first input end of the operational amplifier is connected to the metal decorative member, and the first input end is further passed through The driving resistor is connected to the driving signal source; the input end of the analog-to-digital converter is connected to an output end of the operational amplifier, and an output end of the analog-to-digital converter is connected to the processing unit.
  • a specific implementation method of the touch detection circuit is provided.
  • the drive signal source is further coupled to the processing unit; wherein the processing unit is configured to turn the drive signal source on or off.
  • the driving signal source is turned on or off by the microprocessor.
  • the microprocessor sets the driving signal source output voltage to zero, thereby avoiding the coupling between the driving signal source and the fingerprint sensing electrode. Crosstalk.
  • the touch detection circuit includes: a voltage source, a first switch, a second switch, a third switch, a capacitor, an operational amplifier, and an analog-to-digital converter;
  • the first switch is connected to the metal decoration and the operation Between the first input end of the amplifier, the second switch is connected between the metal garnish and the voltage source;
  • the third switch is connected in parallel with the capacitor to the first input end of the operational amplifier Between the output of the operational amplifier and the output of the operational amplifier, the output of the analog-to-digital converter is coupled to the processing unit;
  • the control ends of the first switch, the second switch, and the third switch respectively receive control signals to achieve opening and closing.
  • the touch detection circuit further includes: a timing circuit unit; three control terminals of the sequential circuit unit are respectively connected to the control ends of the first switch, the second switch, and the third switch.
  • the sequential circuit unit implements control of the first switch, the second switch, and the third switch.
  • FIG. 2 is a block schematic diagram of a fingerprint module in accordance with a first embodiment of the present invention
  • FIG. 3 is a detailed schematic diagram of a touch detection circuit according to a first embodiment of the present invention.
  • FIG. 4 is a detailed schematic diagram of a touch detection circuit in a second embodiment of the present invention.
  • FIG. 6 is a flow chart of a fingerprint module control method according to a sixth embodiment of the present invention.
  • a first embodiment of the present invention relates to a fingerprint module applied to a smart terminal device; for example, the smart terminal device is a smart phone.
  • FIG. 1 is a schematic diagram of a fingerprint module applied to a smart phone;
  • FIG. 2 is a block diagram of a fingerprint module, please refer to FIG. 1 and FIG. 2 together.
  • the fingerprint module specifically includes: a fingerprint sensor, a metal decoration component, a touch detection circuit, and a processing unit.
  • the fingerprint module is disposed in a lower area of the screen 111 of the smart phone, and the metal decoration 112 and the fingerprint sensor 113 are disposed on the surface of the casing of the smart phone, and the metal decoration 112 is disposed on the fingerprint sensor 113 .
  • the metal decorative member 112 on the mobile phone is generally annular and matches the shape of the fingerprint sensor 113.
  • the fingerprint sensor 113 includes a sensing electrode and a protective layer, and the protective layer directly contacts the finger of the user.
  • the touch detection circuit is connected to the metal decoration member; the processing unit is connected to the touch detection circuit and the fingerprint sensor.
  • the processing unit in this embodiment includes: a microprocessor and a fingerprint identification chip; the fingerprint identification chip is connected to the fingerprint sensor; and the microprocessor is connected to the touch detection. Measuring circuit and fingerprint identification chip.
  • the microprocessor and the fingerprint identification chip are divided into processing units according to the function division; in practice, the fingerprint identification chip, the fingerprint sensor, and the metal decoration component may be an off-the-shelf component (ie, in the prior art) Based on this, in the implementation of this case, a touch detection circuit and a microprocessor (a touch detection circuit and a microprocessor constitute an auxiliary chip) are actually added; that is, in the implementation of the solution
  • the existing fingerprint module ie, without any change to the existing fingerprint module
  • the working process of the fingerprint module of the embodiment is as follows: the user touches the fingerprint module, and if the user touches the metal decoration, the touch detection circuit generates a first trigger signal; if the user touches the fingerprint sensor, the fingerprint sensor generates The fingerprint sensing signal, and the fingerprint identification chip generates a second trigger signal according to the fingerprint sensing signal; when the microprocessor receives at least one of the first trigger signal and the second trigger signal, the microprocessor generates a finger touch signal; A touch operation that senses a user's finger.
  • the microprocessor may generate a finger touch signal as long as it touches any one of the sensing area of the fingerprint sensor and the metal decoration member due to the difference in the size of the finger or the difference in the touch position. That is, the metal decorative ring and the fingerprint sensor are jointly detected, thereby expanding the overall detection range of the fingerprint module, thereby reducing the detection dead zone of the finger, and improving the detection accuracy of the fingerprint module when the touch detection function is implemented.
  • the driving resistor R and the parasitic capacitance C 0 of the metal decorative member to the ground GND divide the driving voltage of the driving signal source, and the point A (ie, the first input terminal of the operational amplifier F) The voltage is:
  • Us is the voltage amplitude of the driving voltage
  • f is the frequency of the driving voltage
  • Xc is the reactance of the capacitor C 0
  • C 0 is the capacitance of the metal decorative part to the ground GND.
  • Xc' is the reactance of the capacitance C 0 when the finger touches the metal decoration.
  • the operational amplifier F amplifies the voltage at point A and samples it by the analog-to-digital converter ADC to transmit the sampled data to the microprocessor.
  • the microprocessor calculates the voltage value at point A, and determines whether the finger is touched according to the change of the voltage value at point A. Metal decorative pieces.
  • the drive signal source is also coupled to the microprocessor, and the drive signal source is turned on or off by microprocessor control.
  • the microprocessor sets the output voltage of the driving signal source to zero, thereby avoiding crosstalk caused by the coupling between the driving signal source and the fingerprint sensing electrode.
  • a second embodiment of the invention relates to a fingerprint module, as shown in FIG.
  • Another implementation of the touch detection circuit is provided in the fingerprint module of the second embodiment.
  • the touch detection circuit comprising: a voltage source Vs, the first switch SW1, a second switch SW2, a third switch SW3, the capacitor C 1, an operational amplifier and an analog-F ADC.
  • the first switch SW1 is connected between the first input terminal of the operational amplifier metal trim and F
  • the second switch SW2 is connected between the metal source voltage Vs of the garnish
  • third switch SW3 and the capacitor C 1 is connected in parallel to the operational amplifier
  • the first input terminal of the operational amplifier F is connected to the reference voltage Vcm; wherein, in the embodiment, the first input terminal of the operational amplifier F is a negative phase input terminal,
  • the second input is a positive input.
  • the input end of the analog-to-digital converter ADC is connected to the output end of the operational amplifier F, and the output end of the analog-to-digital converter ADC is connected to the microprocessor; the control ends of the first switch SW1, the second switch SW2 and the third switch SW3 are respectively received Control signals to achieve opening and closing.
  • the touch detection circuit in the embodiment further includes a sequential circuit unit.
  • the three control terminals of the sequential circuit unit are respectively connected to the control ends of the first switch SW1, the second switch SW2, and the third switch SW3; that is, there are sequential circuit units for the first switch SW1, the second switch SW2, and the third switch SW3. Turn on and off for timing control.
  • Step 1 When the touch detection circuit is not working, the third switch SW3 is in a closed state, the first switch SW1 is turned off, and the second switch SW2 is closed; at this time, the output voltage of the operational amplifier F is Vcm (ie, the output voltage of the operational amplifier F) Equal to the reference voltage).
  • Step 2 When the touch detection circuit starts to work, the third switch SW3 is turned off.
  • Step 3 When SW2 is closed, the voltage at point B is Vs.
  • ⁇ U ⁇ C 1 (Vs - Vcm) ⁇ C 0
  • ⁇ U (Vs - Vcm) ⁇ C 0 / C 1
  • Step 5 Repeat steps 3 and 4 and repeat N times (where N can be set to any integer greater than 0).
  • the output voltage of the operational amplifier F is:
  • step 5 the output voltage of the operational amplifier F will change, and the analog-to-digital converter ADC sampling detection operational amplifier The output voltage of F is transmitted to the microprocessor; the microprocessor calculates the value of the voltage at point B, and determines whether the finger touches the metal decorative member according to the change of the voltage value at point B.
  • a third embodiment of the present invention relates to a fingerprint module, as shown in FIG. 5; the third embodiment is substantially the same as the first or second embodiment, and the main difference is that the processing unit of the first or second embodiment
  • the system includes: a microprocessor and a fingerprint identification chip; the processing unit of the embodiment includes a fingerprint identification chip, and the fingerprint identification chip is connected to the touch detection circuit and the fingerprint sensor.
  • the fingerprint recognition chip when the fingerprint recognition chip receives the first trigger signal generated by the touch detection circuit and/or the fingerprint sensing signal generated by the fingerprint sensor, the fingerprint recognition chip generates a finger touch signal.
  • a fourth embodiment of the present invention relates to a touch detection circuit, and the touch detection circuit in the present embodiment is the touch detection circuit in the first embodiment.
  • a sixth embodiment of the present invention relates to a fingerprint module control method.
  • the specific process is shown in Figure 6.
  • the control method of the fingerprint module includes:
  • Step S100 The processing unit determines whether the received signal is a touch operation signal. If yes, go to step 101, if no, go to step 103.
  • the processing unit includes a fingerprint identification chip
  • the fingerprint recognition chip performs step S100.
  • the processing unit includes a microprocessor and a fingerprint identification chip, the microprocessor performs step S100.
  • the processing unit includes a fingerprint identification chip
  • the fingerprint recognition chip performs step S101.
  • the processing unit includes a microprocessor and a fingerprint identification chip
  • the microprocessor and the fingerprint recognition chip simultaneously perform step S101. That is, the microprocessor and the fingerprint recognition chip are switched to the touch detection mode, respectively.
  • Step S102 In the touch detection mode, when the processing unit receives the first trigger signal generated by the touch detection circuit and/or the fingerprint sensing signal generated by the fingerprint sensor, the processing unit generates a finger touch signal.
  • the fingerprint recognition chip receives the fingerprint sensing signal generated by the fingerprint sensor.
  • the fingerprint recognition chip receives the first trigger signal generated by the touch detection circuit and/or the fingerprint sensing signal generated by the fingerprint sensor, the fingerprint recognition chip generates a finger touch signal.
  • the processing unit includes the microprocessor and the fingerprint identification chip
  • the fingerprint recognition chip receives the fingerprint sensing signal generated by the fingerprint sensor
  • the second trigger signal is generated according to the fingerprint sensing signal.
  • the microprocessor generates a finger touch signal when the microprocessor receives the first trigger signal generated by the touch detection circuit and/or the second trigger signal generated by the fingerprint recognition chip.
  • Step S103 The processing unit determines whether the received signal is a fingerprint working signal. If yes, go to step 104, and if no, end.
  • the processing unit includes a fingerprint identification chip
  • the fingerprint recognition chip performs step S103.
  • the processing unit includes a microprocessor and a fingerprint recognition chip, the microprocessor performs step S103.
  • the processing unit includes a fingerprint identification chip
  • the fingerprint recognition chip performs step S104.
  • the processing unit includes a microprocessor and a fingerprint identification chip
  • the microprocessor and the fingerprint recognition chip simultaneously perform step S104. That is, the microprocessor and the fingerprint recognition chip are switched to the touch detection mode, respectively.
  • Step S105 In the fingerprint recognition mode, the processing unit receives the fingerprint sensing signal generated by the fingerprint sensor and generates a fingerprint image signal.
  • the processing unit includes a fingerprint identification chip
  • the fingerprint recognition chip receives the fingerprint sensing signal generated by the fingerprint sensor and generates a fingerprint image signal. Then, the fingerprint identification chip transmits the fingerprint image signal to the main controller; wherein the main controller is the main controller of the smart terminal device applied by the fingerprint module.
  • the processing unit includes a microprocessor and a fingerprint identification chip
  • the fingerprint recognition chip receives the fingerprint sensing signal generated by the fingerprint sensor and generates a fingerprint image signal; and transmits the fingerprint image signal to the main controller through the microprocessor. That is, in the fingerprint recognition mode, the microprocessor acts only as a transmission channel; it does not perform any processing on the fingerprint image signal.

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Abstract

本发明涉及显示技术领域，公开了一种触摸检测电路、指纹模组及其控制方法。本发明中，指纹模组具体包括：指纹传感器、金属装饰件、触摸检测电路以及处理单元；当用户手指接触金属装饰件时，触摸检测电路产生第一触发信号；处理单元连接于触摸检测电路与指纹传感器；其中，当接收到触摸检测电路产生的第一触发信号和/或指纹传感器产生的指纹感应信号时，处理单元生成手指触摸信号。本发明还提供了一种指纹模组的控制方法。本发明中，利用金属装饰环与指纹传感器共同检测，扩大了指纹模组的整体检测范围，从而减小了手指的检测盲区，提高了指纹模组实现触摸检测功能时的检测准确率。

Description

触摸检测电路、指纹模组及其控制方法 技术领域
本发明涉及指纹识别技术领域，特别涉及一种触摸检测电路、指纹模组及其控制方法。
背景技术
移动通信的快速发展，使得智能终端设备得到了极大的普及，指纹识别技术在智能终端设备中有着广泛的应用。
目前，通常在智能终端设备屏幕的下方设置指纹模组，指纹模组除了识别指纹功能，一般还具有触摸检测功能。即，指纹模组可以通过判断是否检测到手指指纹，从而判断出触摸事件。
然而，因为智能终端设备本身尺寸限制，目前的指纹模组尺寸一般较小，其中的指纹传感器通常小于手指大小；若手指没有摆放到位，很可能检测不出来；即容易形成手指检测盲区，降低触摸检测的准确率。
发明内容
本发明的目的在于提供一种触摸检测电路、指纹模组及其控制方法，利用金属装饰件与指纹传感器共同检测，扩大了指纹模组的整体检测范围，从而减小了手指的检测盲区，提高了指纹模组实现触摸检测功能时的检测准确率。
为解决上述技术问题，本发明的实施方式提供了一种指纹模组，具体包括：指纹传感器、金属装饰件、触摸检测电路以及处理单元；所述金属装 饰件环设于所述指纹传感器；所述触摸检测电路连接于所述金属装饰件；当用户手指接触所述金属装饰件时，所述触摸检测电路产生第一触发信号；所述处理单元连接于所述触摸检测电路与所述指纹传感器；其中，当接收到所述触摸检测电路产生的所述第一触发信号和/或所述指纹传感器产生的指纹感应信号时，所述处理单元生成手指触摸信号。
本发明的实施方式还提供了一种触摸检测电路，包括：驱动信号源、驱动电阻、运算放大器以及模数转换器；所述运算放大器的第一输入端连接于所述金属装饰件，所述第一输入端还通过所述驱动电阻连接于所述驱动信号源；所述模数转换器的输入端连接于所述运算放大器的输出端，所述模数转换器的输出端连接于所述处理单元。
本发明的实施方式还提供了一种触摸检测电路，包括：电压源、第一开关、第二开关、第三开关、电容、运算放大器以及模数转换器；所述第一开关连接于所述金属装饰件与所述运算放大器的第一输入端之间，所述第二开关连接于所述金属装饰件与所述电压源之间；所述第三开关与所述电容并联连接于所述运算放大器的第一输入端与所述运算放大器的输出端之间；所述模数转换器的输入端连接于所述运算放大器的输出端，所述模数转换器的输出端连接于所述处理单元；其中，所述第一开关、所述第二开关以及所述第三开关的控制端分别接收控制信号以实现开合。
本发明的实施方式还提供了一种指纹模组控制方法，应用于所述的指纹模组；所述指纹模组的控制方法包括：当处理单元接收触摸工作信号时，所述处理单元切换为触摸检测模式；在所述触摸检测模式中，当所述处理单元接收到触摸检测电路产生的第一触发信号和/或指纹传感器产生的指纹感应信号时，所述处理单元生成手指触摸信号；当所述处理单元接收指纹工作信号时，所述处理单元切换为指纹识别模式；在所述指纹识别模式中，所述处理单元接收所述指纹传感器产生的所述指纹感应信号并生成指纹图像信 号。
本发明实施方式相对于现有技术而言，所述金属装饰件环设与所述指纹传感器，所述触摸检测电路连接于所述金属装饰件，当用户手指接触所述金属装饰件时，所述触摸检测电路产生第一触发信号，所述处理单元连接于所述触摸检测电路与所述指纹传感器；当接收到所述触摸检测电路产生的所述第一触发信号和/或所述指纹传感器产生的指纹感应信号时，所述处理单元生成手指触摸信号。概括地说，所述金属装饰件与所述触摸电路连接后可以感应手指触摸，即利用金属装饰件与指纹传感器共同检测，扩大了指纹模组的整体检测范围，从而减小了手指的检测盲区，提高了指纹模组实现触摸检测功能时的指纹检测的检测准确率。
另外，所述处理单元包括：指纹识别芯片；所述指纹识别芯片连接于所述触摸检测电路与所述指纹传感器；其中，当接收到所述触摸检测电路产生的所述第一触发信号和/或所述指纹传感器产生的所述指纹感应信号时，所述指纹识别芯片生成所述手指触摸信号。即，仅对指纹芯片作软件上的修改，即可实现其他的处理功能；并且，还可以将触摸检测电路与指纹识别芯片集成在一起，可以封装起来作为一个整体；从而可以节约空间摆件，利于智能终端设备的小型化发展。
另外，所述处理单元包括：指纹识别芯片与微处理器；所述指纹识别芯片连接于所述指纹传感器；所述微处理器连接于所述触摸检测电路与所述指纹识别芯片；其中，当接收到所述指纹感应信号时，所述指纹识别芯片产生第二触发信号；当接收到所述第一触发信号和/或所述第二触发信号时，所述微处理器生成所述手指触摸信号。即，新增了一个用于接收第一触发信号和/或所述第二触发信号的微处理器；因此，本方案的实现中，能够利用现有的指纹芯片(即不对现有的指纹芯片作任何改变)与新增的微处理器的结合，来完成指纹模组的全部处理功能；便于实现且制造周期短。
另外，所述触摸检测电路包括：驱动信号源、驱动电阻、运算放大器以及模数转换器；所述运算放大器的第一输入端连接于所述金属装饰件，所述第一输入端还通过所述驱动电阻连接于所述驱动信号源；所述模数转换器的输入端连接于所述运算放大器的输出端，所述模数转换器的输出端连接于所述处理单元。如上所述，提供了触摸检测电路的一种具体实现方法。
另外，所述驱动信号源还连接于所述处理单元；其中，所述处理单元用于打开或关闭所述驱动信号源。驱动信号源由微处理器控制打开或关闭，当处理单元为指纹识别模式时，微处理器设置驱动信号源输出电压为零，从而避免由于驱动信号源与指纹感应电极之间的耦合而导致的串扰。
另外，所述触摸检测电路包括：电压源、第一开关、第二开关、第三开关、电容、运算放大器以及模数转换器；所述第一开关连接于所述金属装饰件与所述运算放大器的第一输入端之间，所述第二开关连接于所述金属装饰件与所述电压源之间；所述第三开关与所述电容并联连接于所述运算放大器的第一输入端与所述运算放大器的输出端之间；所述模数转换器的输入端连接于所述运算放大器的输出端，所述模数转换器的输出端连接于所述处理单元；其中，所述第一开关、所述第二开关以及所述第三开关的控制端分别接收控制信号以实现开合。如上所述，提供了触摸检测电路的另一种具体实现方式。
另外，所述触摸检测电路还包括：时序电路单元；所述时序电路单元的三个控制端分别连接于所述第一开关、所述第二开关以及所述第三开关的控制端。时序电路单元实现了对第一开关、第二开关以及第三开关控制。
附图说明
图1是根据本发明第一实施方式的指纹模组应用于智能手机的示意图；
图2是根据本发明第一实施方式中的指纹模组的方框示意图；
图3根据本发明第一实施方式的触摸检测电路的具体示意图；
图4是根据本发明第二实施方式中的触摸检测电路的具体示意图；
图5是根据本发明第三实施方式的指纹模组的方框示意图；
图6是根据本发明第六实施方式的指纹模组控制方法流程图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明的各实施方式进行详细的阐述。然而，本领域的普通技术人员可以理解，在本发明各实施方式中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本申请所要求保护的技术方案。
本发明的第一实施方式涉及一种指纹模组，应用于智能终端设备；所述智能终端设备例如为智能手机。图1所示为指纹模组应用于智能手机的示意图；图2是指纹模组的方框示意图，请一并参考图1和图2。其中，指纹模组具体包括：指纹传感器、金属装饰件、触摸检测电路以及处理单元。
如图1所示，指纹模组设置于智能手机的屏幕111的下方区域，金属装饰件112与指纹传感器113均设置于智能手机的壳体表面，且金属装饰件112环设于指纹传感器113，以保护和装饰指纹传感器113。其中，手机上的金属装饰件112一般为环形，且与指纹传感器113的形状相匹配。本实施方式中，指纹传感器113包括感应电极和保护层，保护层直接与用户的手指接触。
如图2所示，触摸检测电路连接于金属装饰件；处理单元连接于触摸检测电路与指纹传感器。具体而言，本实施方式中的处理单元包括：微处理器与指纹识别芯片；指纹识别芯片连接于指纹传感器；微处理器连接于触摸检 测电路与指纹识别芯片。
需要说明的是，本案中按照功能划分，将微处理器与指纹识别芯片划分为处理单元；于实际中，指纹识别芯片、指纹传感器、金属装饰件可以是一个现成的组件(即现有技术中的指纹模组)；基于此，本案在实现中，实际上是新增了一个触摸检测电路和一个微处理器(触摸检测电路和微处理器构成一颗辅助芯片)；即本方案的实现中，能够利用现有的指纹模组(即不对现有的指纹模组作任何改变)与新增的触摸检测电路和微处理器的结合，来完成指纹模组的全部处理功能；便于实现且制造周期短。
本实施方式的指纹模组的工作过程如下：用户手指触摸指纹模组，若用户手指接触到金属装饰件，则触摸检测电路产生第一触发信号；若用户手指接触到指纹传感器，则指纹传感器产生指纹感应信号，且指纹识别芯片根据指纹感应信号产生第二触发信号；当微处理器接收到第一触发信号与第二触发信号中的至少其中之一时，微处理器生成手指触摸信号；即表示感应到用户手指的触摸操作。
因此，用户触摸操作时，也许由于手指大小的差异或触摸位置的不同，只要接触到指纹传感器的感应区域与金属装饰件中的任意一个，微处理器都可以生成手指触摸信号。即，利用金属装饰环与指纹传感器共同检测，扩大了指纹模组的整体检测范围，从而减小了手指的检测盲区，提高了指纹模组实现触摸检测功能时的检测准确率。
本实施方式中的触摸检测电路，如图3所示，具体包括：驱动信号源、驱动电阻R、运算放大器F以及模数转换器ADC。运算放大器F的第一输入端连接于金属装饰件，第一输入端还通过驱动电阻R连接于驱动信号源；运算放大器F的第二输入端连接于参考电压Vcm；其中，本实施方式中运算放大器F的第一输入端为负相输入端，第二输入端为正向输入端。模数转换器ADC的输入端连接于运算放大器F的输出端，模数转换器ADC的输出端连 接于微处理器。
本实施方式中的触摸检测电路的手指触摸检测原理如下：
当金属装饰件没有手指触摸时，驱动电阻R和金属装饰件对地GND的寄生电容C0对驱动信号源输出的驱动电压进行分压，A点(即运算放大器F的第一输入端)的电压为：
Figure PCTCN2016085613-appb-000001
其中，公式中Us为驱动电压的电压幅值，f为驱动电压的频率，Xc为电容C0的电抗，C0为金属装饰件对地GND的电容。
由于手指和地也存在寄生电容ΔC，当手指触摸金属装饰件时，ΔC和C0是并联的关系，A的电压变为：
Figure PCTCN2016085613-appb-000002
其中，Xc'是手指触摸金属装饰件时电容C0的电抗。
可知手指触摸金属装饰件之后，A点电压变小。运算放大器F将A点电压放大并由模数转换器ADC采样后将采样数据传输至微处理器，微处理器计算出A点电压值，并根据A点电压值的变化，判断手指是否触摸了金属装饰件。
较佳的，驱动信号源还连接到微处理器，驱动信号源由微处理器控制打开或关闭。当处理单元为指纹识别模式时，微处理器设置驱动信号源输出电压为零，从而避免由于驱动信号源与指纹感应电极之间的耦合而导致的串扰。
本发明第二实施方式涉及一种指纹模组，如图4所示。第二实施方式的 指纹模组中提供了触摸检测电路的另一种实现方式。触摸检测电路包括：电压源Vs、第一开关SW1、第二开关SW2、第三开关SW3、电容C1、运算放大器F以及模数转换器ADC。第一开关SW1连接于金属装饰件与运算放大器F的第一输入端之间，第二开关SW2连接于金属装饰件与电压源Vs之间；第三开关SW3与电容C1并联连接于运算放大器F的第一输入端与运算放大器F的输出端之间；运算放大器F的第二输入端连接于参考电压Vcm；其中，本实施方式中运算放大器F的第一输入端为负相输入端，第二输入端为正向输入端。模数转换器ADC的输入端连接于运算放大器F的输出端，模数转换器ADC的输出端连接于微处理器；第一开关SW1、第二开关SW2以及第三开关SW3的控制端分别接收控制信号以实现开合。
较佳的，本实施方式中的触摸检测电路还包括时序电路单元。时序电路单元的三个控制端分别连接于第一开关SW1、第二开关SW2、第三开关SW3的控制端；即，有时序电路单元对第一开关SW1、第二开关SW2、第三开关SW3的打开和关闭进行时序控制。
本实施方式中的触摸检测电路的手指触摸检测方法，可以分为如下步骤：
步骤1：当触摸检测电路尚未工作时，第三开关SW3处于闭合状态，第一开关SW1断开，第二开关SW2闭合；此时运算放大器F的输出电压为Vcm(即运算放大器F的输出电压等于参考电压)。
步骤2：当触摸检测电路开始工作时，第三开关SW3断开。
步骤3：SW2闭合时，B点电压为Vs。
步骤4：SW1闭合时，由于Vs≠Vcm，金属装饰件对地GND的电容C0会向电容C1放电，直到B点电压等于Vcm，放电过程C0的电荷转移到C1，会使C1两端电压发生变化，满足关系：
ΔU×C1＝(Vs-Vcm)×C0，ΔU＝(Vs-Vcm)×C0/C1
由于此时B点电压稳定为Vcm，因此相当于运算放大器F的输出电压变化ΔU；
步骤5：重复步骤3、4，重复N次(此处N可以设为任意大于0的整数)则运算放大器F输出电压为：
Vo＝Vcm+N×ΔU＝Vcm+N×(Vs-Vcm)×C0/C1
当手指触摸金属装饰件时，根据第一实施方式中的描述，C0将会变大，根据步骤5中的公式可知，运算放大器F输出电压将发生变化，模数转换器ADC采样检测运算放大器F的输出电压，并将采样数据传输至微处理器；微处理器计算出B点电压的值，并根据B点电压值的变化，判断手指是否触摸了金属装饰件。
本发明第三实施方式涉及一种指纹模组，如图5所示；第三实施方式与第一或第二实施方式大致相同，主要区别之处在于：第一或第二实施方式的处理单元包括：微处理器与指纹识别芯片；本实施方式的处理单元包括指纹识别芯片，指纹识别芯片连接于触摸检测电路与指纹传感器。
本实施方式中，当指纹识别芯片接收到触摸检测电路产生的第一触发信号和/或指纹传感器产生的指纹感应信号时，指纹识别芯片生成手指触摸信号。
于本实施方式中，仅对指纹芯片作软件上的修改，即可实现其他的处理功能；并且，还可以将触摸检测电路与指纹识别芯片集成在一起，可以封装起来作为一个整体；从而可以节约空间摆件，利于智能终端设备的小型化发展。
本发明第四实施方式涉及一种触摸检测电路，本实施方式中的触摸检测电路即为第一实施方式中的触摸检测电路。
本发明第五实施方式涉及一种触摸检测电路，本实施方式中的触摸检 测电路即为第二实施方式中的触摸检测电路。
本发明第六实施方式涉及一种指纹模组控制方法。具体流程如图6所示。指纹模组的控制方法包括：
步骤S100：处理单元判断接收的信号是否为触摸工作信号。若是，进入步骤101，若否，进入步骤103。
若处理单元包括指纹识别芯片，则指纹识别芯片执行步骤S100。
若处理单元包括微处理器与指纹识别芯片，则微处理器执行步骤S100。
步骤S101：处理单元切换为触摸检测模式。
若处理单元包括指纹识别芯片，则指纹识别芯片执行步骤S101。
若处理单元包括微处理器与指纹识别芯片，则微处理器与指纹识别芯片同时执行步骤S101。即，微处理器与指纹识别芯片分别切换至触摸检测模式。
步骤S102：在触摸检测模式中，当处理单元接收到触摸检测电路产生的第一触发信号和/或指纹传感器产生的指纹感应信号时，处理单元生成手指触摸信号。
若处理单元包括指纹识别芯片，则，指纹识别芯片接收指纹传感器产生的指纹感应信号。当指纹识别芯片接收到触摸检测电路产生的第一触发信号和/或指纹传感器产生的指纹感应信号时，指纹识别芯片生成手指触摸信号。
若处理单元包括微处理器与指纹识别芯片，则当指纹识别芯片接收到指纹传感器产生的指纹感应信号后，根据指纹感应信号产生第二触发信号。当微处理器接收到触摸检测电路产生的第一触发信号和/或指纹识别芯片产生的第二触发信号时，微处理器生成手指触摸信号。
步骤S103：处理单元判断接收的信号是否为指纹工作信号。若是，进入步骤104，若否，则结束。
若处理单元包括指纹识别芯片，则指纹识别芯片执行步骤S103。
若处理单元包括微处理器与指纹识别芯片，则微处理器执行步骤S103。
步骤S104：处理单元切换为指纹识别模式。
若处理单元包括指纹识别芯片，则指纹识别芯片执行步骤S104。
若处理单元包括微处理器与指纹识别芯片，则微处理器与指纹识别芯片同时执行步骤S104。即，微处理器与指纹识别芯片分别切换至触摸检测模式。
步骤S105：在指纹识别模式中，处理单元接收指纹传感器产生的指纹感应信号并生成指纹图像信号。
若处理单元包括指纹识别芯片，则指纹识别芯片接收指纹传感器产生的指纹感应信号并生成指纹图像信号。然后，指纹识别芯片将指纹图像信号传输至主控制器；其中，主控制器为指纹模组所应用的智能终端设备的主控制器。
若处理单元包括微处理器与指纹识别芯片，则指纹识别芯片接收指纹传感器产生的指纹感应信号并生成指纹图像信号；并通过所述微处理器将指纹图像信号传输至主控制器。即，在指纹识别模式中，微处理器仅仅作为一个传输通道；而不会对指纹图像信号作任何处理。
上面各种方法的步骤划分，只是为了描述清楚，实现时可以合并为一个步骤或者对某些步骤进行拆分，分解为多个步骤，只要包括相同的逻辑关系，都在本专利的保护范围内；对算法中或者流程中添加无关紧要的修改或者引入无关紧要的设计，但不改变其算法和流程的核心设计都在该专利的保 护范围内。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的精神和保护范围之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围内。

Claims (10)

  1. 一种指纹模组，其特征在于，包括：指纹传感器、金属装饰件、触摸检测电路以及处理单元；
    所述金属装饰件环设于所述指纹传感器；
    所述触摸检测电路连接于所述金属装饰件；当用户手指接触所述金属装饰件时，所述触摸检测电路产生第一触发信号；
    所述处理单元连接于所述触摸检测电路与所述指纹传感器；
    其中，当接收到所述触摸检测电路产生的所述第一触发信号和/或所述指纹传感器产生的指纹感应信号时，所述处理单元生成手指触摸信号。
  2. 根据权利要求1所述的指纹模组，其特征在于，所述处理单元包括：指纹识别芯片；
    所述指纹识别芯片连接于所述触摸检测电路与所述指纹传感器；
    其中，当接收到所述触摸检测电路产生的所述第一触发信号和/或所述指纹传感器产生的所述指纹感应信号时，所述指纹识别芯片生成所述手指触摸信号。
  3. 根据权利要求1所述的指纹模组，其特征在于，所述处理单元包括：指纹识别芯片与微处理器；
    所述指纹识别芯片连接于所述指纹传感器；
    所述微处理器连接于所述触摸检测电路与所述指纹识别芯片；
    其中，当接收到所述指纹感应信号时，所述指纹识别芯片产生第二触发信号；当接收到所述第一触发信号和/或所述第二触发信号时，所述微处理器生成所述手指触摸信号。
  4. 根据权利要求1所述的指纹模组，其特征在于，所述触摸检测电路 包括：驱动信号源、驱动电阻、运算放大器以及模数转换器；
    所述运算放大器的第一输入端连接于所述金属装饰件，所述第一输入端还通过所述驱动电阻连接于所述驱动信号源；
    所述模数转换器的输入端连接于所述运算放大器的输出端，所述模数转换器的输出端连接于所述处理单元。
  5. 根据权利要求4所述的指纹模组，其特征在于，所述驱动信号源还连接于所述处理单元；其中，所述处理单元用于打开或关闭所述驱动信号源。
  6. 根据权利要求1所述的指纹模组，其特征在于，所述触摸检测电路包括：电压源、第一开关、第二开关、第三开关、电容、运算放大器以及模数转换器；
    所述第一开关连接于所述金属装饰件与所述运算放大器的第一输入端之间，所述第二开关连接于所述金属装饰件与所述电压源之间；
    所述第三开关与所述电容并联连接于所述运算放大器的第一输入端与所述运算放大器的输出端之间；
    所述模数转换器的输入端连接于所述运算放大器的输出端，所述模数转换器的输出端连接于所述处理单元；
    其中，所述第一开关、所述第二开关以及所述第三开关的控制端分别接收控制信号以实现开合。
  7. 根据权利要求6所述的指纹模组，其特征在于，所述触摸检测电路还包括：时序电路单元；
    所述时序电路单元的三个控制端分别连接于所述第一开关、所述第二开关以及所述第三开关的控制端。
  8. 一种触摸检测电路，其特征在于，所述触摸检测电路为权利要求4 或5所述的指纹模组中的所述触摸检测电路。
  9. 一种触摸检测电路，其特征在于，所述触摸检测电路为权利要求6或7所述的指纹模组中的所述触摸检测电路。
  10. 一种指纹模组的控制方法，其特征在于，应用于权利要求1至7中任意一项所述的指纹模组；所述指纹模组的控制方法包括：
    当处理单元接收触摸工作信号时，所述处理单元切换为触摸检测模式；
    在所述触摸检测模式中，当所述处理单元接收到触摸检测电路产生的第一触发信号和/或指纹传感器产生的指纹感应信号时，所述处理单元生成手指触摸信号；
    当所述处理单元接收指纹工作信号时，所述处理单元切换为指纹识别模式；
    在所述指纹识别模式中，所述处理单元接收所述指纹传感器产生的所述指纹感应信号并生成指纹图像信号。
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