WO2017197945A1 - 指纹识别电路、触控装置及指纹识别方法 - Google Patents

指纹识别电路、触控装置及指纹识别方法 Download PDF

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Publication number
WO2017197945A1
WO2017197945A1 PCT/CN2017/074551 CN2017074551W WO2017197945A1 WO 2017197945 A1 WO2017197945 A1 WO 2017197945A1 CN 2017074551 W CN2017074551 W CN 2017074551W WO 2017197945 A1 WO2017197945 A1 WO 2017197945A1
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Prior art keywords
circuit
sub
output
fingerprint identification
signal
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2017/074551
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English (en)
French (fr)
Inventor
何小祥
祁小敬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to US15/562,570 priority Critical patent/US10095910B2/en
Publication of WO2017197945A1 publication Critical patent/WO2017197945A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31—User authentication
    • G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0716—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
    • G06K19/0718—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor the sensor being of the biometric kind, e.g. fingerprint sensors
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06V40/1347—Preprocessing; Feature extraction
    • G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06V40/1365—Matching; Classification
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/117—Identification of persons
    • A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
    • A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting

Definitions

  • the present application belongs to the field of fingerprint recognition technology, and particularly relates to a fingerprint identification circuit, a touch device and a fingerprint recognition method.
  • FIG. 1 is a schematic structural diagram of a fingerprint identification circuit in the prior art.
  • the fingerprint identification circuit generally includes a sensing electrode 10 and a scanning trace G arranged by rows and columns (as shown in FIG. 1 ). G1, G2, G3, and G4), the detection signal is written to the trace X (X1, X2, X3, and X4 in FIG. 1) and the TFT switch 11 provided corresponding to the sensing electrode 10.
  • the working process of the first row of sensing electrodes in the fingerprint identification circuit shown in FIG. 1 is described in detail below, and the working process specifically includes the following stages:
  • Detection signal writing phase a driving voltage is applied to the scanning trace G1 to turn on the first row of TFT switches 11, and at the same time, each sensing of the first row is detected by the detection signal writing traces X1-X4 The electrode 10 writes a detection signal.
  • (b) fingerprint sensing stage when fingerprint texture sensing does not occur, based on the capacitance formed by the sensing electrode 10, the potentials of the respective sensing electrodes 10 of the first row are the same, as shown by D1-D4 in FIG. 2a;
  • the finger touches the sensing electrode 10 since the fingerprint texture is divided into two peaks and valleys, the distance between the peak and the valley and the sensing electrode 10 is not the same, and therefore, the peak and valley pairs respectively correspond to the sensing electrode 10
  • the effect of the capacitor is different, also That is, the influences on the potentials on the respective corresponding sensing electrodes 10 are different.
  • the potentials of the respective sensing electrodes 10 of the first row become different, as shown in FIG. 2b.
  • each detection signal write trace X is connected to a read sub-circuit 12, as shown in Fig. 2c, and the read sub-circuit 12 is used for reading after sensing the fingerprint texture.
  • the induced signal generated on the electrode 10 is processed and processed.
  • step (d) Contrast processing stage: comparing the detection signal written in step (a) with the sensing signal read in step (c), determining the fingerprint texture corresponding to the position of each sensing electrode 10 according to the difference between the two Is it a peak or a valley?
  • the fingerprint texture corresponding to the position of the electrode 10 is a peak or a valley.
  • the existing fingerprint recognition circuit has the following problems in practical applications: fingerprint recognition takes a long time and has low accuracy.
  • the present application aims to solve at least one of the technical problems existing in the prior art, and provides a fingerprint identification circuit, a touch device and a fingerprint recognition method, which can improve the accuracy of fingerprint recognition.
  • a fingerprint identification circuit including a plurality of read sub-circuits and a plurality of fingerprint identification sub-circuits arranged in rows and columns, each column fingerprint identification sub-circuit is provided Connected to a read sub-circuit, each of the fingerprint identification sub-circuits includes: a write sub-circuit, a sense sub-circuit and an output sub-circuit connected in sequence, and the control end of the write sub-circuit is connected to the scan signal input end And opening when the valid signal is input to the scan signal input end, to write a detection signal to the sensing sub-circuit; the sensing sub-circuit senses the fingerprint and sends the obtained sensing signal to the output sub-circuit; The output sub-circuit turns on and outputs the sensing signal when the writing sub-circuit is turned off, and opens in the writing sub-circuit
  • the activation of the fingerprint recognition sub-circuit further includes:
  • a conversion amplification sub-circuit disposed between the sensing sub-circuit and the output sub-circuit, configured to convert the sensing signal output by the sensing sub-circuit into a current signal and amplify a preset multiple and then deliver the Output subcircuit, wherein
  • the read sub-circuit is connected to an output end of the output sub-circuit for reading the sensing signal and converting the current signal into a voltage signal for output.
  • each of the fingerprint identification sub-circuits further includes: a reset sub-circuit disposed between an output end of the conversion amplification sub-circuit and an input end of the output sub-circuit for the writing When the sub-circuit is turned on, the input terminal of the output sub-circuit is reset to a low level.
  • control end of the output sub-circuit of one fingerprint identification sub-circuit is connected to the control end of the write sub-circuit of another fingerprint identification sub-circuit of the same row, so that the output sub-circuit of the one fingerprint identification sub-circuit And the writing sub-circuit of the other fingerprint identification sub-circuit is turned on or off at the same time.
  • control end of the writing sub-circuit of each of the fingerprint identification sub-circuits of the same row is connected to the same scanning signal input end for causing each of the same row when the valid signal is loaded on the scanning signal input end
  • the writing sub-circuit of the fingerprint identification sub-circuit is simultaneously turned on;
  • the input terminals of the write sub-circuits of the respective fingerprint identification sub-circuits of the same column are connected to the same signal line.
  • each of the read subcircuits comprises:
  • An operational amplifier having an inverting input coupled to the output of the output subcircuit, wherein a pure resistor subcircuit is coupled in parallel between the inverting input and the output.
  • the write sub-circuit includes: a first transistor having a gate serving as a control end of the write sub-circuit for controlling opening and closing of the write sub-circuit;
  • the input terminal of the write subcircuit has its second pole as the output of the write subcircuit.
  • the sensing subcircuit includes: a first electrode and a second electrode disposed opposite to each other, wherein
  • the second electrode is connected to the control signal end, wherein the control signal end is used to input a control signal to adjust the preset multiple of the conversion amplification sub-circuit.
  • the conversion amplification sub-circuit includes: a second transistor having a gate as an input end of the conversion amplification sub-circuit; a first pole connected to the first level input terminal; and a second pole serving as a The output of the conversion amplifying subcircuit.
  • the output sub-circuit includes: a third transistor having a gate serving as a control end of the output sub-circuit for controlling opening and closing of the output sub-circuit; and a first pole thereof as the output A signal input of the circuit is coupled to the signal output of the conversion amplifier circuit; and a second polarity thereof is used as an output of the output subcircuit.
  • the reset sub-circuit includes: a fourth transistor having a gate serving as a control end of the reset sub-circuit for controlling opening and closing of the reset sub-circuit; and a first pole and a second level thereof The input terminal is connected, and the second pole thereof is connected as an output terminal of the reset sub-circuit to an input terminal of the output sub-circuit.
  • a touch device including a fingerprint identification circuit, wherein the fingerprint identification circuit uses the fingerprint identification circuit provided by the present application.
  • a fingerprint identification method using the fingerprint identification circuit of the present application comprising the following steps:
  • the sensing sub-circuit senses the fingerprint and generates an inductive signal, converts the sensing signal into a current signal and amplifies a preset multiple, and opens the connection with the sensing sub-circuit.
  • Output sub-circuit the output sub-circuit outputs an induced signal sensed by the sensing sub-circuit after being turned on;
  • the read sub-circuit reads the induced signal output by the output sub-circuit and converts the current signal into a voltage signal output.
  • the method further includes: inputting an output sub-circuit of the fingerprint identification sub-circuit when the write sub-circuit of the fingerprint identification sub-circuit writes the detection signal The terminal is reset to a low potential.
  • the method further includes: opening the write sub-circuit of another fingerprint identification sub-circuit located in the same row and the next row of the fingerprint identification sub-circuit while the output sub-circuit of the fingerprint identification sub-circuit is turned on.
  • FIG. 1 is a schematic diagram of a fingerprint identification circuit in the prior art
  • FIG. 2a is a schematic diagram of a capacitor voltage of a first row of sensing electrodes of the fingerprint identification circuit shown in FIG. 1 at a stage of writing a detection signal;
  • 2b is a schematic diagram of a capacitor voltage of a first row of sensing electrodes of the fingerprint identification circuit shown in FIG. 1 during a fingerprint sensing phase;
  • 2c is a schematic diagram of a fingerprint identification circuit including a read sub-circuit in the prior art
  • FIG. 3 is a schematic block diagram of a fingerprint identification sub-circuit of a fingerprint identification circuit according to an embodiment of the present application
  • Figure 3b is a specific circuit diagram of the fingerprint identification sub-circuit shown in Figure 3a;
  • FIG. 4 is a partial schematic diagram of a fingerprint identification circuit according to an embodiment of the present application.
  • FIG. 5a is a timing diagram of fingerprint recognition using the fingerprint identification circuit shown in FIG. 4;
  • FIG. 5b is a schematic diagram showing a capacitance formed between a fingerprint and a sensing sub-circuit during fingerprint sensing by using the fingerprint identification circuit shown in FIG. 3;
  • Figure 5c is a schematic illustration of the Ids-Vgs curve associated with an embodiment of the present application.
  • FIG. 3a is a schematic block diagram of a fingerprint identification sub-circuit of the fingerprint identification circuit provided by the embodiment of the present application
  • FIG. 3b is a schematic diagram of the fingerprint identification sub-circuit shown in FIG. 3a
  • FIG. 4 is a partial schematic diagram of a fingerprint identification circuit according to an embodiment of the present application.
  • a fingerprint identification circuit provided by an embodiment of the present application includes a plurality of fingerprint identification sub-circuits 20 and a plurality of read sub-circuits 26, wherein the plurality of fingerprint identification sub-circuits 20 are matrixed according to the matrix. Arranged, and each column of fingerprint identification sub-circuits 20 is coupled to a corresponding read sub-circuit 26.
  • each fingerprint recognition sub-circuit 20 includes a write sub-circuit 21, a sense sub-circuit 22, a conversion amplification sub-circuit 24, and an output sub-circuit 23 which are sequentially connected.
  • the control terminal of the write sub-circuit 21 is connected to the scan signal input terminal G, and is turned on when the scan signal input terminal G inputs a valid signal, thereby writing a detection signal to the sensing sub-circuit 22; the sensing sub-circuit 22 is used for The sensing fingerprint is sent to the output sub-circuit of the conversion amplifying sub-circuit 24; the conversion amplifying sub-circuit 24 is configured to convert the sensing signal into a current signal and amplify the preset multiple and send it to the output sub-circuit 23.
  • the corresponding read sub-circuit 26 connected to the fingerprint recognition sub-circuit 20 is connected to the output terminal of the output sub-circuit 23 for reading the induced signal from the output sub-circuit 23 and converting the current signal into a voltage signal for output.
  • the output sub-circuit 23 is configured to turn on and output an inductive signal when the write sub-circuit 21 of the fingerprint identification sub-circuit in which it is located is off (the inductive signal is a signal after the detection signal is fingerprint-sensed), and is located therein.
  • the writing sub-circuit 21 of the fingerprint identification sub-circuit is turned off when it is turned on.
  • control end of the output sub-circuit of one fingerprint identification sub-circuit is connected to the control end of the write sub-circuit of another fingerprint identification sub-circuit for making the output sub-circuit of the one fingerprint identification sub-circuit and the other
  • the write sub-circuit of the fingerprint recognition sub-circuit is simultaneously turned on or off. As shown in FIG.
  • the control terminal of the output sub-circuit 23 of the first fingerprint identification sub-circuit 20 is connected to the control terminal of the input sub-circuit 21 of the second fingerprint identification sub-circuit 20, Therefore, when Gn is a valid signal, the output sub-circuit 23 of the first fingerprint identification sub-circuit 20 and the input sub-circuit 21 of the second fingerprint identification sub-circuit 20 are simultaneously turned on. That is, as shown in FIG. 4, the control terminal of the output sub-circuit 23 of the fingerprint identification sub-circuit 20 of the n-1th row is connected to the scan signal input terminal Gn connected to the write sub-circuit 21 of the fingerprint recognition sub-circuit 20 of the nth row. Thus, when Gn is a valid signal, the fingerprint identification sub-circuit 20 of the n-1th line The output sub-circuit 23 and the write sub-circuit 21 of the fingerprint identification sub-circuit 20 of the n-th row are simultaneously turned on.
  • both the output of the fingerprint identification sub-circuit and the opening of the next fingerprint identification sub-circuit are performed, which is required to be turned on after the output of a fingerprint identification sub-circuit in the prior art.
  • the scanning time of the fingerprint recognition process can be reduced, thereby improving the fingerprint recognition efficiency.
  • the write sub-circuit 21 includes a first transistor T1 whose gate is connected as a control terminal of the write sub-circuit 21 to the scan signal input terminal G for controlling the write sub-circuit. Opening and closing of 21; a first pole of the first transistor T1 is connected to Vin as a signal input end of the write sub-circuit 21, and a second pole of the first transistor T1 is used as a signal output end of the write sub-circuit 21. It is connected to the sensing sub-circuit 22.
  • the sensing sub-circuit 22 includes: a first electrode A and a second electrode Txn disposed opposite to each other, wherein the first electrode A is respectively connected to the second electrode of the writing sub-circuit 21 and the signal input end of the conversion amplifying sub-circuit 24;
  • the two electrodes Txn are connected to a control signal terminal (not shown) for adjusting a preset multiple of the conversion amplifying subcircuit 24 under a control signal input from the control signal terminal.
  • the conversion amplifying sub-circuit 24 includes: a second transistor T2 having a gate as a signal input terminal of the conversion amplifying sub-circuit; a first electrode of the second transistor T2 connected to the first level input terminal Vdd, and a second transistor T2 The second pole is connected as a signal output terminal of the conversion amplifying subcircuit 24 to a signal input terminal of the output subcircuit 23.
  • the output sub-circuit 23 includes a third transistor T3 whose gate serves as a control terminal of the output sub-circuit 23 for controlling the opening and closing of the output sub-circuit 23, and a first electrode of the third transistor T3 as a signal of the output sub-circuit 23.
  • the second terminal of the third transistor T3 outputs a signal output terminal of the sub-circuit 23.
  • the read sub-circuit 26 includes an operational amplifier having an inverting input terminal connected to the signal output terminal of each output sub-circuit 23, and a pure resistor sub-circuit Rf connected in parallel between the inverting input terminal and the output terminal, and FIG. 2c Compared with the prior art shown, it is possible to quickly identify the ridges or valleys of the fingerprint without waiting for the integration processing time, thereby improving the reporting rate and fluency.
  • each fingerprint recognition sub-circuit 20 further includes a reset sub-circuit 25 disposed between the conversion amplification sub-circuit 24 and the output sub-circuit 23 for turning on when the write sub-circuit 21 is turned on, The input end of the output sub-circuit 23 is reset to a low level, so that the level of the input end and the output end are equal when the output sub-circuit 23 is turned on to avoid affecting the sensing signal, thereby avoiding the accuracy of fingerprint recognition. influences.
  • the reset sub-circuit 25 includes a fourth transistor T4 whose gate serves as a control terminal of the reset sub-circuit 25, which is also connected to the scan signal input terminal G for controlling the turn-on and turn-off of the reset sub-circuit 25; the fourth transistor The first pole of T4 is connected to the second level input terminal Vss, and the second pole of the fourth transistor T4 is connected as a signal output terminal of the reset sub-circuit 25 to the signal input terminal of the third transistor T3.
  • the plurality of fingerprint identification sub-circuits 20 of the fingerprint identification circuit are arranged in the following manner: the plurality of fingerprint identification sub-circuits 20 are arranged in a matrix of a plurality of rows and columns, similar to that shown in FIG. 1; The control terminals of the write sub-circuits 21 of the plurality of fingerprint recognition sub-circuits 20 are connected to the same scan signal input terminal G for enabling the respective fingerprint recognition sub-circuits 20 of the same row when the valid signal is loaded on the scan signal input terminal G.
  • the writing sub-circuit 21 is simultaneously turned on; the signal input end of the writing sub-circuit 21 of the plurality of fingerprint identifying sub-circuits 20 of the same column is connected by a signal line (similar to the detection signal writing trace X in FIG. 1), that is, Connected to Vin; the signal output ends of the output sub-circuits 23 of the plurality of fingerprint identification sub-circuits 20 of the same column are connected to the same read sub-circuit 26, and the read sub-circuit 26 does not have a signal corresponding to the column.
  • the lines (detection signal write traces X) are connected, but are connected to the signal output terminals of the respective output sub-circuits 23.
  • the working process of the fingerprint identification circuit provided by the embodiment of the present application is specifically described below with reference to FIG. 5a - FIG. 5c and FIG.
  • the work process includes the following stages:
  • a capacitance Cf1 is generated between the ridge and the sensing sub-circuit 22; a capacitance Cf2 is generated between the valley and the sensing sub-circuit 22, and Cf1 is not equal to Cf2, so that the capacitance Cf2 and the capacitance Cf1 change.
  • Txn can be a DC source.
  • the magnitude of Txn can also be an adjustable value, which can be positive or negative.
  • the voltage Vout1 ⁇ I2*Rf, the ratio of the corresponding output voltages is large, wherein Rf represents the resistance value of the resistor Rf in the read sub-circuit 26. Therefore, it is easy to distinguish the ridges and valleys of the fingerprint, thereby improving the accuracy of fingerprint recognition. degree.
  • the fingerprint texture corresponding to the position of each sensing electrode 10 is a peak or a valley to facilitate identification of the fingerprint.
  • the fingerprint identification circuit provided in this embodiment is provided with a conversion amplifying sub-circuit between the sensing sub-circuit and the output sub-circuit of each fingerprint identifying sub-circuit for converting the sensing signal into a current signal and amplifying the pre-
  • the multiplier is sent to the output sub-circuit; and the sensing signal is read by the reading sub-circuit and the current signal is converted into a voltage signal output, so that the current signals output by the corresponding conversion sub-circuits of the ridges and valleys of the fingerprint are greatly different.
  • the outputted respective converted voltage signals are also largely different, so that the ridges and valleys can be easily identified, that is, the accuracy of fingerprint recognition is improved, and the conventional integrator circuit is replaced by a resistor in the output sub-circuit. , which saves the integration time and improves the detection speed.
  • the embodiment of the present application further provides a touch device, which includes a fingerprint identification circuit.
  • the fingerprint identification circuit is a fingerprint recognition circuit as provided in the above embodiment 1.
  • details of the fingerprint identification circuit refer to the content of Embodiment 1 above, and details are not described herein again.
  • the embodiment of the present application provides a fingerprint identification method, which can be applied to the fingerprint identification circuit provided in Embodiment 1 above.
  • the fingerprint identification method provided by the embodiment of the present application includes the following steps:
  • the sensing sub-circuit After the writing sub-circuit writes the detection signal, the sensing sub-circuit senses The fingerprint generates an induced signal and sends it to the output sub-circuit, and the output sub-circuit connected to the sensing sub-circuit is turned on, and the output sub-circuit outputs the sensing signal sensed by the sensing sub-circuit after being turned on.
  • the fingerprint identification method further includes: the reading sub-circuit reads the sensing signal output by the output sub-circuit and converts the current signal into a voltage signal for output.
  • the fingerprint identification method further comprises: when the writing sub-circuit of the fingerprint identification sub-circuit writes the detection signal, resetting the input end of the output sub-circuit of the fingerprint identification sub-circuit to a low potential.
  • the write sub-circuit of the fingerprint recognition sub-circuit of the same row and the next row is turned on.

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Abstract

本申请提供了一种指纹识别电路，包括多个读取子电路以及按行和列排列的多个指纹识别子电路，每一列指纹识别子电路与一个读取子电路连接，每个所述指纹识别子电路包括：依次相连的写入子电路、感测子电路和输出子电路，所述写入子电路的控制端与扫描信号输入端相连，并在所述扫描信号输入端输入有效信号时开启，以向所述感测子电路写入检测信号；所述感测子电路感应指纹并将获得的感应信号发送至所述输出子电路；所述输出子电路在所述写入子电路关闭时开启并输出所述感应信号，以及在所述写入子电路开启时关闭；其中，每个所述指纹识别子电路还包括:转换放大子电路，其设置在所述感测子电路和所述输出子电路之间，用于将所述感测子电路输出的感应信号转化为电流信号并放大预设倍数之后输送至所述输出子电路，其中所述读取子电路与所述输出子电路的输出端相连，用于读取所述感应信号并将电流信号转换为电压信号进行输出，这样可提高指纹识别准确度。

Description

指纹识别电路、触控装置及指纹识别方法
相关申请的交叉引用
本申请要求于2016年5月20日提交的申请号为201610342252.1、发明名称为“指纹识别电路、触控装置及指纹识别方法”的申请的优先权，其全部内容通过引用并入本文。
技术领域
本申请属于指纹识别技术领域，具体涉及一种指纹识别电路、一种触控装置及一种指纹识别方法。
背景技术
近年来，随着带有指纹识别解锁功能的手机等电子产品的普及，将指纹识别技术推向了一个新的应用时代。电子产品中的指纹识别过程通常由指纹识别电路控制。
图1示出了现有技术中的一种指纹识别电路的结构示意图，如图1所示，指纹识别电路通常包括由行列交叉排列的感测电极10、扫描走线G(如图1中的G1、G2、G3和G4)、检测信号写入走线X(如图1中的X1、X2、X3和X4)以及与感测电极10对应设置的TFT开关11。
下面详细描述图1所示的指纹识别电路中的第一行感测电极的工作过程，其工作过程具体包括以下几个阶段：
(a)检测信号写入阶段：在扫描走线G1上施加驱动电压，以使第一行TFT开关11打开，同时，通过检测信号写入走线X1-X4分别向第一行的各个感测电极10写入检测信号。
(b)指纹感应阶段：当未发生指纹纹理感应时，则基于感测电极10所形成的电容，第一行的各个感测电极10的电位相同，如图2a中的D1-D4所示；当手指触摸感测电极10时，由于指纹纹理分为峰、谷两个形貌，峰和谷与感测电极10之间的距离并不相同，因此，峰和谷对各自对应感测电极10的电容的影响不同，也 即对各自对应的感测电极10上的电位影响不同，当发生指纹纹理感应时，第一行的各个感测电极10的电位变得不同，如图2b中所示。
(c)信号读取阶段：每一条检测信号写入走线X连接至一个读取子电路12，如图2c所示，读取子电路12用于读取在进行指纹纹理感应后在感测电极10上产生的感应信号并对该感应信号进行处理。
(d)对比处理阶段：对比步骤(a)中写入的检测信号与步骤(c)读取的感应信号，根据二者之间的差异来确定每个感测电极10所在位置对应的指纹纹理是峰还是谷。
依次类推，重复上述(a)～(d)，依次对第二行感测电极，第三行感测电极，直至最后一行感测电极进行扫描，从而可以确定整个指纹识别电路的每个感测电极10所在位置对应的指纹纹理是峰还是谷。
然而，采用现有的指纹识别电路在实际应用中存在以下问题：指纹识别耗时长且准确度低。
发明内容
本申请旨在至少解决现有技术中存在的技术问题之一，提出了一种指纹识别电路、一种触控装置及一种指纹识别方法，能够提高指纹识别的准确度。
为解决上述问题之一，根据本申请的第一方面，提供了一种指纹识别电路，包括多个读取子电路以及按行和列排列的多个指纹识别子电路，每一列指纹识别子电路与一个读取子电路连接，每个所述指纹识别子电路包括：依次相连的写入子电路、感测子电路和输出子电路，所述写入子电路的控制端与扫描信号输入端相连，并在所述扫描信号输入端输入有效信号时开启，以向所述感测子电路写入检测信号；所述感测子电路感应指纹并将获得的感应信号发送至所述输出子电路；所述输出子电路在所述写入子电路关闭时开启并输出所述感应信号，以及在所述写入子电路开 启时关闭；其特征在于，每个所述指纹识别子电路还包括:
转换放大子电路，其设置在所述感测子电路和所述输出子电路之间，用于将所述感测子电路输出的感应信号转化为电流信号并放大预设倍数之后输送至所述输出子电路，其中
所述读取子电路与所述输出子电路的输出端相连，用于读取所述感应信号并将电流信号转换为电压信号进行输出。
可选地，每个所述指纹识别子电路还包括：复位子电路，其设置在所述转换放大子电路的输出端和所述输出子电路的输入端之间，用于在所述写入子电路开启时开启，将所述输出子电路的输入端复位至低电位。
可选地，一个指纹识别子电路的输出子电路的控制端与同列下一行的另一指纹识别子电路的写入子电路的控制端相连，使得该一个所述指纹识别子电路的输出子电路和该另一所述指纹识别子电路的写入子电路同时开启或关闭。
可选地，同一行的各个所述指纹识别子电路的写入子电路的控制端与同一个扫描信号输入端相连，用以在所述扫描信号输入端上加载有效信号时使得同一行的各个指纹识别子电路的写入子电路同时开启；
同一列的各个所述指纹识别子电路的写入子电路的输入端连接至同一条信号线。
可选地，每个所述读取子电路包括：
运算放大器，其反相输入端与所述输出子电路的输出端相连，其中在其反相输入端和输出端之间并联有纯电阻子电路。
可选地，所述写入子电路包括：第一晶体管，其栅极作为所述写入子电路的控制端，用于控制所述写入子电路的开启与关闭；其第一极作为所述写入子电路的输入端，其第二极作为所述写入子电路的输出端。
可选地，所述感测子电路包括：相对设置的第一电极和第二电极，其中
所述第一电极分别与所述写入子电路和所述转换放大子电路 相连；
所述第二电极与控制信号端相连，其中所述控制信号端用于输入控制信号来调整所述转换放大子电路的所述预设倍数。
可选地，所述转换放大子电路包括：第二晶体管，其栅极作为所述转换放大子电路的输入端；其第一极与第一电平输入端相连；并且其第二极作为所述转换放大子电路的输出端。
可选地，所述输出子电路包括：第三晶体管，其栅极作为所述输出子电路的控制端，用于控制所述输出子电路的开启与关闭；其第一极作为所述输出子电路的信号输入端与所述转换放大子电路的信号输出端连接；并且其第二极作为所述输出子电路的输出端。
可选地，所述复位子电路包括：第四晶体管，其栅极作为所述复位子电路的控制端，用于控制所述复位子电路的开启与关闭；其第一极与第二电平输入端相连，其第二极作为所述复位子电路的输出端与所述输出子电路的输入端连接。
根据本申请的第二方面，提供触控装置，包括指纹识别电路，其特征在于，所述指纹识别电路采用本申请提供的指纹识别电路。
根据本申请的第三方面，还提供一种应用本申请所述的指纹识别电路的指纹识别方法，该方法包括以下步骤：
开启一个指纹识别子电路的写入子电路，以向该指纹识别子电路的感测子电路写入检测信号，同时关闭该指纹识别子电路的输出子电路；
在所述写入子电路写入检测信号完成之后，感测子电路感测指纹并产生感应信号，将所述感应信号转化为电流信号并放大预设倍数，并开启与该感测子电路连接的输出子电路，所述输出子电路在开启后输出所述感测子电路感测到的感应信号；以及
读取子电路读取所述输出子电路输出的所述感应信号并将电流信号转换为电压信号输出。
可选地，该方法还包括：在所述指纹识别子电路的写入子电路在写入检测信号时，将该指纹识别子电路的输出子电路的输入 端复位至低电位。
可选地，该方法还包括：在开启该指纹识别子电路的输出子电路的同时，开启与该指纹识别子电路位于同列且下一行的另一个指纹识别子电路的写入子电路。
附图说明
图1为现有技术中的一种指纹识别电路的示意图；
图2a为图1所示的指纹识别电路的第一行感测电极在写入检测信号阶段的电容电压示意图；
图2b为图1所示的指纹识别电路的第一行感测电极在指纹感应阶段的电容电压示意图；
图2c为现有技术中包含读取子电路的指纹识别电路的示意图；
图3a为本申请实施例提供的指纹识别电路的一个指纹识别子电路的原理框图；
图3b为图3a所示的指纹识别子电路的一种具体电路图；
图4为本申请实施例提供的指纹识别电路的局部示意图；
图5a为采用图4所示的指纹识别电路进行指纹识别的时序图；
图5b为采用图3所示的指纹识别电路在指纹感应时指纹与感测子电路之间形成的电容示意图；
图5c为与本申请实施例有关的Ids-Vgs曲线的示意图。
具体实施方式
为使本领域的技术人员更好地理解本申请的技术方案，下面结合附图来对本申请提供的指纹识别电路、触控装置及指纹识别方法进行详细描述。
实施例1
图3a为本申请实施例提供的指纹识别电路的一个指纹识别子电路的原理框图；图3b为图3a中所示的指纹识别子电路的一种 具体电路示意图；图4为本申请实施例提供的指纹识别电路的局部示意图。如图4所示，本申请实施例提供的一种指纹识别电路包括多个指纹识别子电路20和多个读取子电路26，其中，该多个指纹识别子电路20按照行列方式成矩阵式排列，并且每一列的指纹识别子电路20均与一个对应读取子电路26连接。接下来，如图3a和图3b所示，每个指纹识别子电路20包括：依次连接的写入子电路21、感测子电路22、转换放大子电路24、输出子电路23。其中，写入子电路21的控制端与扫描信号输入端G相连，并在扫描信号输入端G输入有效信号时开启，从而向感测子电路22写入检测信号；感测子电路22用于感应指纹并将输出获得的感应信号发送至转换放大子电路24输出子电路；转换放大子电路24用于将感应信号转化为电流信号并放大预设倍数之后发送至输出子电路23。此外，与该指纹识别子电路20连接的对应读取子电路26与输出子电路23的输出端相连，用于从输出子电路23读取感应信号并将电流信号转换为电压信号后进行输出。
其中，输出子电路23用于在其所在的指纹识别子电路的写入子电路21关闭时开启并输出感应信号(该感应信号为上述检测信号经过指纹感应之后的信号)，以及在其所在的指纹识别子电路的写入子电路21开启时关闭。
可选地，一个指纹识别子电路的输出子电路的控制端与另一指纹识别子电路的写入子电路的控制端相连，用于使该一个指纹识别子电路的输出子电路和该另一指纹识别子电路的写入子电路同时开启或关闭。如图4所示，按照从上到下的顺序，第一个的指纹识别子电路20的输出子电路23的控制端与第二个指纹识别子电路20的输入子电路21的控制端相连，因此，在Gn为有效信号时，第一个的指纹识别子电路20的输出子电路23和第二个指纹识别子电路20的输入子电路21同时开启。即，如图4所示，第n-1行的指纹识别子电路20的输出子电路23的控制端连接第n行的指纹识别子电路20的写入子电路21连接的扫描信号输入端Gn，这样，在Gn为有效信号时，第n-1行的指纹识别子电路20 的输出子电路23和第n行的指纹识别子电路20的写入子电路21同时开启。
也就是说，在同一时刻，既进行了该指纹识别子电路的输出，又进行了下一指纹识别子电路的开启，这与现有技术中需要在一个指纹识别子电路输出之后再开启下一个指纹识别子电路相比，可以减少指纹识别过程的扫描时间，从而可以提高指纹识别效率。
可选地，如图3b所示，写入子电路21包括第一晶体管T1，其栅极作为所述写入子电路21的控制端与扫描信号输入端G连接，用于控制写入子电路21的开启与关闭；第一晶体管T1的第一极作为所述写入子电路21的信号输入端连接至Vin，第一晶体管T1的第二极作为所述写入子电路21的信号输出端与感测子电路22连接。
感测子电路22包括：相对设置的第一电极A和第二电极Txn，其中，第一电极A分别与写入子电路21的第二极和转换放大子电路24的信号输入端相连；第二电极Txn与控制信号端(图中未示出)相连，用于在控制信号端输入的控制信号下调整转换放大子电路24的预设倍数。
转换放大子电路24包括：第二晶体管T2，其栅极作为所述转换放大子电路的信号输入端；第二晶体管T2的第一极与第一电平输入端Vdd相连，第二晶体管T2的第二极作为转换放大子电路24的信号输出端与输出子电路23的信号输入端连接。
输出子电路23包括：第三晶体管T3，其栅极作为输出子电路23的控制端，用于控制输出子电路23的开启与关闭；第三晶体管T3的第一极作为输出子电路23的信号输入端，第三晶体管T3的第二极为输出子电路23的信号输出端。
读取子电路26包括：运算放大器，其反相输入端与各输出子电路23的信号输出端相连，在其反相输入端和输出端之间并联有纯电阻子电路Rf，这与图2c所示的现有技术相比，无需等待积分处理时间，就能够快速的识别指纹的脊或谷，提高报点率和流畅性。
可选地，每个指纹识别子电路20还包括复位子电路25，复位子电路25设置在转换放大子电路24和输出子电路23之间，用于在写入子电路21开启时开启，以将输出子电路23的输入端复位至低电位，这样，在输出子电路23开启时可保证输入端和输出端的电平相等，以避免对感应信号造成影响，因而可避免对指纹识别的精度产生影响。
具体地，复位子电路25包括第四晶体管T4，其栅极作为复位子电路25的控制端，其也连接至扫描信号输入端G，用于控制复位子电路25的开启与关闭；第四晶体管T4的第一极与第二电平输入端Vss相连，第四晶体管T4的第二极作为复位子电路25的信号输出端连接至第三晶体管T3的信号输入端。
在实际应用中，该指纹识别电路的多个上述指纹识别子电路20的设置方式如下：多个指纹识别子电路20以多行多列的矩阵形式排列，类似于图1所示；同一行的多个指纹识别子电路20的写入子电路21的控制端与同一个扫描信号输入端G相连，用以在扫描信号输入端G上加载有效信号时使同一行的各个指纹识别子电路20的写入子电路21同时开启；同一列的多个指纹识别子电路20的写入子电路21的信号输入端通过一条信号线(类似图1中的检测信号写入走线X)相连，即，与Vin连接；同一列的多个所述指纹识别子电路20的输出子电路23的信号输出端连接同一个所述读取子电路26，该读取子电路26并不与该列对应的信号线(检测信号写入走线X)相连，而是与各输出子电路23的信号输出端连接。
下面结合图5a-图5c和图4具体描述本申请实施例提供的指纹识别电路的工作过程。该工作过程包括以下几个阶段：
(a)检测信号写入阶段：在扫描信号输入端Gn-1上施加驱动电压(有效信号为高电平)，以使第一个指纹识别子电路20的第一晶体管T1和第四晶体管T4开启，同时，通过Vin向指纹识别子电路20的感测子电路22的第一电极A写入检测信号，此时，第一电极A的电压VA＝Vin；且图3b中所示的B点复位，B点电压 VB＝Vss(地)。
(b)指纹感应阶段：当人手指触摸到感测子电路22时，由于指纹纹理分为峰和谷两个形貌，且峰和谷与感测子电路22之间的距离不相同，因此，峰和谷各自对感测子电路22的电容的影响不同。
如图5b所示，触摸时，脊与感测子电路22之间产生电容Cf1；谷与感测子电路22之间产生电容Cf2，Cf1不等于Cf2，这样，该电容Cf2和电容Cf1会改变第二电极Txn和第一电极A之间的互容，因此，感测子电路22对应输出不同的电压，脊对应输出电压Va1，谷对应电压Va2，Va1和Va2不相等，ΔV＝Va1-Va2；Va1作用在T2上产生电流I1，Va2作用在T2上产生电流I2；第二电极Txn上加载脉冲控制信号，用来调节第二晶体管T2的栅极(gate)的信号的大小，以使得ΔV处于在较大范围内，以便于区分脊和谷，也即，图5c中Ids的范围B较大(例如，I1与I2二者之比较大)。
当然，若图3b中节点B的复位信号和指纹感测信号相加后已经处于Ids-Vgs曲线的B范围内，则无需通过向第二电极Txn上加载脉冲控制信号调节，此时，第二电极Txn上加载DC源。
其中，Txn可为DC源，当然，Txn的幅值还可为可调节值，可为正，可为负。
(c)信号读取阶段：在扫描信号输入端Gn-1上施加反向驱动电压，以使第一个的指纹识别子电路20的第一晶体管T1和第四晶体管T4关闭，同时在第二个扫描信号输入端Gn上施加驱动电压，以使第二个的指纹识别子电路20的第一晶体管T1和第四晶体管T4开启，同时第一个指纹识别子电路20的第三晶体管T3开启，第三晶体管T3将感应信号输送至读取子电路26。
读取子电路26将脊和谷对应输出的电流I1和I2进行处理，具体为，脊所对应的读取子电路输出的电压Vout1＝-I1*Rf，谷所对应的读取子电路输出的电压Vout1＝-I2*Rf，二者对应输出电压的比值很大，其中，Rf代表读取子电路26中的电阻Rf的电阻值。因此，很容易就区分指纹的脊和谷，从而可提高指纹识别的准确 度。
(d)对比处理阶段：对比步骤(a)中写入的检测信号与步骤(c)读取的感应信号，根据变化量确定每个感测电极10所在位置对应的指纹纹理是峰还是谷。
依次类推，重复上述(a)～(d)，依次对第二行指纹识别子电路，第三行指纹识别子电路，直至最后一行指纹识别子电路20进行扫描，从而可以确定整个指纹识别电路的每个感测电极10所在位置对应的指纹纹理是峰还是谷，以便于识别指纹。
由上可知，本实施例提供的指纹识别电路，在每个指纹识别子电路的感测子电路和输出子电路之间设置有转换放大子电路，用于将感应信号转化为电流信号并放大预设倍数之后输送至输出子电路；并且借助读取子电路读取感应信号并将电流信号转换为电压信号输出，能够使得指纹的脊和谷各自对应的转换放大子电路输出的电流信号相差较大，因此输出的各自转换后的电压信号也就相差较大，从而能够容易识别脊和谷，也即提高了指纹识别的准确度，而且由于在输出子电路中以电阻代替了传统的积分器电路，从而节省了积分时间，而提高了检测速度。
实施例2
本申请实施例还提供了一种触控装置，该触控装置包括指纹识别电路。该指纹识别电路为如上述实施例1提供的指纹识别电路。关于指纹识别电路的具体内容，可以参见上述实施例1的内容，此处不再赘述。
实施例3
本申请实施例提供了一种指纹识别方法，该指纹识别方法可以应用于上述实施例1提供的指纹识别电路。本申请实施例提供的指纹识别方法包括以下步骤：
201、开启一个指纹识别子电路的写入子电路，以向该指纹识别子电路的感测子电路写入检测信号，同时关闭该指纹识别子电路的输出子电路。
202、在写入子电路写入检测信号完成之后，感测子电路感应 指纹并产生感应信号并发送至输出子电路，开启与该感测子电路连接的输出子电路，输出子电路在开启后输出所述感测子电路感测到的感应信号。
其中，该指纹识别方法还包括：读取子电路读取所述输出子电路输出的所述感应信号并将电流信号转换为电压信号进行输出。
可选地，该指纹识别方法还包括：在指纹识别子电路的写入子电路在写入检测信号时，将该指纹识别子电路的输出子电路的输入端复位至低电位。
可选地，在开启该指纹识别子电路的输出子电路的同时，开启同列且下一行的指纹识别子电路的写入子电路。
关于该指纹识别方法的具体实现原理同上述实施例1，具体可参见上述实施例1内容，此处不再赘述。
可以理解的是，以上实施方式仅仅是为了说明本申请的原理而采用的示例性实施方式，然而本申请并不局限于此。对于本领域内的普通技术人员而言，在不脱离本申请的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本申请的保护范围。

Claims (14)

  1. 一种指纹识别电路，包括多个读取子电路以及按行和列排列的多个指纹识别子电路，每一列指纹识别子电路与一个读取子电路连接，每个所述指纹识别子电路包括：依次相连的写入子电路、感测子电路和输出子电路，所述写入子电路的控制端与扫描信号输入端相连，并在所述扫描信号输入端输入有效信号时开启，以向所述感测子电路写入检测信号；所述感测子电路感应指纹并将获得的感应信号发送至所述输出子电路；所述输出子电路在所述写入子电路关闭时开启并输出所述感应信号，以及在所述写入子电路开启时关闭；其特征在于，每个所述指纹识别子电路还包括:
    转换放大子电路，其设置在所述感测子电路和所述输出子电路之间，用于将所述感测子电路输出的感应信号转化为电流信号并放大预设倍数之后输送至所述输出子电路，其中
    所述读取子电路与所述输出子电路的输出端相连，用于读取所述输出子电路输出的感应信号并将电流信号转换为电压信号进行输出。
  2. 根据权利要求1所述的指纹识别电路，其特征在于，每个所述指纹识别子电路还包括：复位子电路，其设置在所述转换放大子电路的输出端和所述输出子电路的输入端之间，用于在所述写入子电路开启时开启，将所述输出子电路的输入端复位至低电位。
  3. 根据权利要求1所述的指纹识别电路，其特征在于，一个指纹识别子电路的输出子电路的控制端与同列下一行的另一指纹识别子电路的写入子电路的控制端相连，使得该一个指纹识别子电路的输出子电路和该另一指纹识别子电路的写入子电路同时开启或关闭。
  4. 根据权利要求1所述的指纹识别电路，其特征在于，同一行的各个所述指纹识别子电路的写入子电路的控制端与同一个扫描信号输入端相连，用以在所述扫描信号输入端上加载有效信号时使得同一行的各个指纹识别子电路的写入子电路同时开启；
    同一列的各个所述指纹识别子电路的写入子电路的输入端连接至同一条信号线。
  5. 根据权利要求1-4中任一项所述的指纹识别电路，其特征在于，每个所述读取子电路包括：
    运算放大器，其反相输入端与所述输出子电路的输出端相连，其中在其反相输入端和输出端之间并联有纯电阻子电路。
  6. 根据权利要求5所述的指纹识别电路，其特征在于，所述写入子电路包括：第一晶体管，其栅极作为所述写入子电路的控制端，用于控制所述写入子电路的开启与关闭；其第一极作为所述写入子电路的输入端，其第二极作为所述写入子电路的输出端。
  7. 根据权利要求6所述的指纹识别电路，其特征在于，所述感测子电路包括：相对设置的第一电极和第二电极，其中
    所述第一电极分别与所述写入子电路和所述转换放大子电路相连；
    所述第二电极与控制信号端相连，其中所述控制信号端用于输入控制信号来调整所述转换放大子电路的所述预设倍数。
  8. 根据权利要求7所述的指纹识别电路，其特征在于，所述转换放大子电路包括：第二晶体管，其栅极作为所述转换放大子电路的输入端；其第一极与第一电平输入端相连；并且其第二极作为所述转换放大子电路的输出端。
  9. 根据权利要求8所述的指纹识别电路，其特征在于，所述输出子电路包括：第三晶体管，其栅极作为所述输出子电路的控制端，用于控制所述输出子电路的开启与关闭；其第一极作为所述输出子电路的信号输入端与所述转换放大子电路的信号输出端连接；并且其第二极作为所述输出子电路的输出端。
  10. 根据权利要求2所述的指纹识别电路，其特征在于，所述复位子电路包括：第四晶体管，其栅极作为所述复位子电路的控制端，用于控制所述复位子电路的开启与关闭；其第一极与第二电平输入端相连，其第二极作为所述复位子电路的输出端与所述输出子电路的输入端连接。
  11. 一种触控装置，包括指纹识别电路，其特征在于，所述指纹识别电路采用上述权利要求1-10任意一项权利要求所述的指纹识别电路。
  12. 一种应用权利要求1-10中任一项所述的指纹识别电路的指纹识别方法，其特征在于，包括以下步骤：
    开启一个指纹识别子电路的写入子电路，以向该指纹识别子电路的感测子电路写入检测信号，同时关闭该指纹识别子电路的输出子电路；
    在所述写入子电路写入检测信号完成之后，感测子电路感测指纹并产生感应信号，将所述感应信号转化为电流信号并放大预设倍数，并开启与该感测子电路连接的输出子电路，所述输出子电路在开启后输出所述感测子电路感测到的感应信号；以及
    读取子电路读取所述输出子电路输出的所述感应信号并将电流信号转换为电压信号输出。
  13. 根据权利要求12所述的指纹识别方法，其特征在于，还包括：在所述指纹识别子电路的写入子电路在写入检测信号时， 将该指纹识别子电路的输出子电路的输入端复位至低电位。
  14. 根据权利要求12所述的指纹识别方法，其特征在于，在开启该指纹识别子电路的输出子电路的同时，开启与该指纹识别子电路位于同列且下一行的另一个指纹识别子电路的写入子电路。
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