CN105893918A - Fingerprint detection device and method - Google Patents
Fingerprint detection device and method Download PDFInfo
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- CN105893918A CN105893918A CN201510038161.4A CN201510038161A CN105893918A CN 105893918 A CN105893918 A CN 105893918A CN 201510038161 A CN201510038161 A CN 201510038161A CN 105893918 A CN105893918 A CN 105893918A
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Abstract
The present invention discloses a fingerprint detection device and method. The device comprises multiple detection units which are arranged according to a predetermined arrangement rule and are used for detecting the fingerprint information of a user. Each detection unit comprises a sensing module, a protection ring, and a driving module, wherein, the protection ring is arranged around the sensing module, the driving module is connected to the protection ring, and the driving module is used for driving the detection unit.
Description
Technical field
The present invention relates to electronic technology field, particularly to a kind of finger print detection device and method.
Background technology
Along with the development of science and technology, increasing electronic equipment enters in work and the life of people, such as smart mobile phone, panel computer etc..In order to improve the safety of electronic equipment, a lot of electronic equipments are both provided with fingerprint identification device, by identifying that the identity of user is authenticated, to improve the safety of electronic equipment by the fingerprint of user.
But present inventor is in realizing the embodiment of the present application during technical scheme, find above-mentioned prior art at least exists following technical problem:
Traditional active semiconductor fingerprint identification device is as it is shown in figure 1, be around to drive ring, and centre is induction arrays, and such design causes fingerprint identification device structure design comparison complicated, relatively costly.And drive ring operationally, drive signal will be loaded on whole driving ring, need high pressure to be driven, so also increase the power consumption of electronic equipment.
Summary of the invention
The embodiment of the present invention provides a kind of finger print detection device and method, is used for solving fingerprint recognition apparatus structure design comparison in prior art complicated, needs high drive, the technical problem that power consumption is higher.
On the one hand, the embodiment of the present application provides a kind of finger print detection device, and described device includes:
The multiple detector units arranged according to predetermined arranging rule, the plurality of detector unit is for detecting the finger print information of user；
Each detector unit in the plurality of detector unit includes:
Induction module, protection ring and driving module；Wherein, described protection ring is arranged on around described induction module, and described driving module is connected with described protection ring, and described driving module is used for driving described detector unit.
Optionally, the plurality of detector unit is arranged into rectangular array according to predetermined arranging rule.
Optionally, described induction module is arranged at the ground floor of described detector unit, and described drive module setting is in the second layer of described detector unit, and wherein, described ground floor is positioned at the top of the described second layer.
Optionally, described detector unit also includes:
Operational amplifier; described operational amplifier includes first input end and the second input; described first input end is connected with described induction module, and described second input is connected with described protection ring, and described operational amplifier is for realizing the Buffer output of signal after electric capacity is converted to voltage.
Optionally, described detector unit also includes:
First switching device, second switch device, the first reset circuit and the second reset circuit；
Wherein, described first switching device includes the first end and the second end, described first end is connected with the first input end of described operational amplifier, described second end is connected with described first reset circuit, described second switch device includes the 3rd end and the 4th end, described 3rd end is connected with the second input and the outfan of described operational amplifier, described 4th end is connected with described second reset circuit, described first reset circuit and described second reset circuit are for the first input end to described operational amplifier, the magnitude of voltage of the second input and outfan resets, one reset reference magnitude of voltage is set.
Optionally, described driving module includes: driving circuit section and driving capacitive part, described driving capacitive part is connected with the first input end of described induction module and described operational amplifier, described driving circuit section is connected with described driving capacitive part, wherein, described driving circuit section is used for driving described induction module, described driving capacitive part is for realizing electric charge electric charge transfer between described driving capacitive part and the first inductance capacitance, when described first inductance capacitance is finger touch described fingerprint identification device, inductance capacitance between finger and described induction module.
On the other hand, the embodiment of the present application also provides for a kind of fingerprint detection method, is applied to finger print detection device, and described finger print detection device includes: the multiple detector units arranged according to predetermined arranging rule, and the plurality of detector unit is for detecting the finger print information of user；Each detector unit in the plurality of detector unit includes: induction module, protection ring and driving module；Wherein, described protection ring is arranged on around described induction module, and described driving module is connected with described protection ring, and described driving module is used for driving described detector unit, described method to include:
When finger user being detected contacts the plurality of detector unit, according to preset rules, obtain the finger print information of each detector unit in the plurality of detector unit, wherein, described preset rules is each detector unit load driver signal according to preset order, obtains the finger print information of each fingerprint module；
Finger print information based on described each fingerprint module, obtains complete finger print information.
Optionally, described fingerprint identification device includes operational amplifier module, and described operational amplifier module is for realizing the Buffer output of signal after electric capacity is converted to voltage, described according to preset rules, obtain the finger print information of each detector unit in the plurality of detector unit, specifically include:
Reseting stage, resets to the magnitude of voltage of first input end, the second input and the outfan of described operational amplifier module, arranges a reset reference magnitude of voltage；
Detection-phase, by induction module described in described driving module drive, the magnitude of voltage changing the first input end of described operational amplifier module, the second input and outfan is the second magnitude of voltage；
The output stage, according to described reset reference magnitude of voltage and the relation of described second magnitude of voltage, it is thus achieved that the first magnitude of voltage of described first detector unit output, described first magnitude of voltage is for characterizing the finger print information on the position that finger contacts with described first detector unit.
Optionally, described driving module includes driving circuit section and drives capacitive part, described driving circuit section is connected with described driving capacitive part, described driving capacitive part is driving the transfer of the electric charge between capacitive part and the first inductance capacitance for realizing electric charge, when described first inductance capacitance is finger touch fingerprint identification device, the inductance capacitance between finger and described induction module.
Said one in the embodiment of the present application or multiple technical scheme, at least have one or more technique effects following:
In the scheme of the embodiment of the present application; each detector unit of finger print detection device is made up of induction module and the protection ring of himself; when detector unit detection finger print information; by load driver signal on the protection ring of each detector unit; this detector unit is driven; make in this programme without high drive; have only to load stable supply voltage; solve in prior art; finger print detection device needs high drive; the technical problem that power consumption is higher, it is achieved that reduce the technique effect of the power consumption of finger print detection device.
Further, since each detector unit of finger print detection device is made up of induction module and the protection ring of himself, then being formed fingerprint detection array by multiple such detector units, structure design is simpler.
Accompanying drawing explanation
Fig. 1 is the structural representation of fingerprint identification device in prior art；
Fig. 2 is the schematic diagram of array of detection units in the embodiment of the present application one；
Fig. 3 is the schematic diagram of the inductance capacitance in the embodiment of the present application one between induction module and protection ring；
Fig. 4 A-Fig. 4 B is that in the embodiment of the present application one, finger passes through the schematic diagram forming inductance capacitance between dielectric layer and single sensing unit；
Fig. 5 is the annexation block diagram of capacitive detection circuit in the embodiment of the present application one；
Fig. 6 A-Fig. 6 B is to input control signal and the schematic diagram of output signal in the embodiment of the present application one；
Fig. 7 is the conversion output waveform figure of capacitive detection circuit in the embodiment of the present application one；
Fig. 8 is that the refinement of capacitive detection circuit in the embodiment of the present application one converts output waveform figure；
Fig. 9 is the method flow diagram of fingerprint detection method in the embodiment of the present application two.
Detailed description of the invention
In the technical scheme that the embodiment of the present application provides; each detector unit of finger print detection device is made up of induction module and the protection ring of himself; when detector unit detection finger print information; by load driver signal on the protection ring of each detector unit; this detector unit is driven; make in this programme without high drive; have only to load stable supply voltage; solve in prior art; finger print detection device needs high drive; the technical problem that power consumption is higher, it is achieved that reduce the technique effect of the power consumption of finger print detection device.
The terms "and/or", a kind of incidence relation describing affiliated partner, can there are three kinds of relations, such as, A and/or B, can represent in expression: individualism A, there is A and B, individualism B these three situation simultaneously.It addition, character "/" herein, typically represent forward-backward correlation to as if the relation of a kind of "or".
Below in conjunction with the accompanying drawings the main of the embodiment of the present application technical scheme is realized principle, detailed description of the invention and be explained in detail the beneficial effect that should be able to reach.
Embodiment one
The embodiment of the present application provides a kind of finger print detection device, and as shown in Figure 2 and Figure 5, described device includes:
The multiple detector units 10 arranged according to predetermined arranging rule, the plurality of detector unit 10 is for detecting the finger print information of user；
Each detector unit in the plurality of detector unit includes:
Induction module 101, protection ring 102 and driving module 103；Wherein, described protection ring 102 is arranged on described induction module 101 around, and described driving module 103 is connected with described protection ring 102, and described driving module 103 is used for driving described detector unit 10.
Specifically, multiple detector units 10 can be arranged into rectangular array as shown in Figure 2 according to predetermined arranging rule, in specific implementation process, it is also possible to is arranged in the arrangements such as circular array, and the application is without limitation.
In the embodiment of the present application, simple in construction due to detector unit, can these detector units be carried out individually placed, in specific implementation process, in order to make the size of finger print detection device reduce, detector unit can be divided into upper and lower double-layer structure, superstructure is induction module, i.e. induction panel, understructure is the testing circuit of this detector unit so that each detector unit can its testing circuit individually placed.
In the embodiment of the present application, testing circuit, including the driving module 103 of described detector unit, also includes other components and parts of this detector unit, such as: switch, operational amplifier etc., the application does not enumerates at this.
Next; inductance capacitance between induction module 101 and the protection ring 102 of each detector unit is analyzed; as shown in Figure 3; induction module 101 is the induction panel of finger sensing fingerprint; when after finger contact medium layer; induction module 101 forms the inductance capacitance between direct-to-ground capacitance, i.e. finger and induction module 101 with fingerprint ridge and the fingerprint valley of composition fingerprint.And the effect of protection ring 102 is to protect the side ambient of induction module 101 so that the side ambient of induction module 101 is consistent, will not be disturbed by other sensing units so that testing result is more accurate, the Cb in figure1, Cb2, Cb3, Cb4For the inductance capacitance of four direction between induction module 101 and protection ring 102, in the embodiment of the present application, inductance capacitance and be equivalent to Cb=Cb1+Cb2+Cb3+Cb4。
Further, when finger touches fingerprint identification device, as shown in Figure 4 A and 4 B shown in FIG., for finger in the embodiment of the present application through the schematic diagram forming inductance capacitance between dielectric layer and single sensing unit.
Wherein, Cfinger is the inductance capacitance between finger surface and detector unit, and owing to fingerprint ridge is convex surfaces, and fingerprint valley is sunk surface, and dielectric layer surface is uniform, described according to capacitance calculation formula C=ε S ÷ d between parallel-plate, can be equivalent to
C ridge=ε S ÷ d
1/C paddy=1/ (ε S ÷ d)+1/ (ε1S÷d1), C paddy=ε ε1S÷(dε1+d1ε)
Wherein, ε and ε1For the dielectric constant of medium between pole plate, S is polar plate area, d and d1For the distance between pole plate.
In the embodiment of the present application, the detection of fingerprint mainly detects the capacitive differential between C ridge and C paddy exactly.
In the embodiment of the present application, in Fig. 4 A and Fig. 4 B, Td is inductance capacitance Cfinger and the input coupling electric capacity between induction module 101 with protection ring 102, and Tf is another input coupling electric capacity between induction module 101 with protection ring 102.
It follows that the capacitive detection circuit in the embodiment of the present application is illustrated.As it is shown in figure 5, be the block diagram of capacitive detection circuit annexation.
Specifically, testing circuit includes OPA buffer (OPA full name: operational amplifier, Chinese: operational amplifier；Buffer Chinese: Buffer output device), to the Buffer output of signal after photovoltaic conversion and complete the protection of effective capacitance for realizing electric capacity.Specifically, described operational amplifier includes that first input end and the second input, described first input end are connected with described induction module 101, and described second input is connected with described protection ring 102.
Described testing circuit also includes driving circuit section, for according to having controlled the driving to detector unit.In specific implementation process, for the detector unit of rectangular array, the detector unit in array can be controlled and carry out progressive scan detection or scan by column detection, naturally it is also possible to being scanned detection otherwise, the application is without limitation.
Specifically, driving circuit section (Driver) is connected with driving capacitive part (Cdrive), capacitive part is driven to be connected with the first input end of induction module 101 and operational amplifier, under the driving voltage that driving circuit section provides, drive capacitive part to be used for realizing electric charge and drive capacitive part and the first inductance capacitance (i.e., Cfinger) the electric charge transfer between, when first inductance capacitance is finger touch described fingerprint identification device, the inductance capacitance between finger and described induction module.
Described testing circuit also includes: the first switching device (SW1), second switch device (SW2), reset switch are for the initial detecting state of initialization circuit.
Specifically, first switching device includes the first end and the second end, first end is connected with the first input end of operational amplifier, second end and the first reset circuit connect, second switch device includes the 3rd end and the 4th end, 3rd end is connected with the second input and the outfan of operational amplifier, 4th end and the second reset circuit connect, first reset circuit and the second reset circuit are for resetting to the magnitude of voltage of first input end, the second input and the outfan of operational amplifier, one reset reference magnitude of voltage, i.e. Vref in Fig. 5 are set.
In Figure 5, Vdrive is for driving signal, and S1 is reset switch control signal.
It follows that the capacitance detecting process in the embodiment of the present application is illustrated.
In the embodiment of the present application, when detecting, input control signal is as shown in Figure 6A, as shown in Figure 6B, wherein, Vref is reset reference magnitude of voltage to output signal, S1 is reset switch control signal, and Vdrive is for driving signal, and VTf is OPA buffer output voltage waveforms.
Specifically, at reseting stage, SW1 and SW2 is controlled by signal S1 so that input and the outfan of OPA buffer are initialised, and resetting voltage is Vref.After reset terminates, S1 signal switches to low level, SW1 and SW2 disconnects, load driver signal Vdrive, by driving electric capacity Cdrive that electric charge is moved to Cfinger, completes Charge scaling, realize the electric capacity conversion to voltage signal, now, input and the output end voltage of OPA buffer change, and VTf is OPA buffer output voltage waveforms.
It follows that the calculating to the conversion semaphore of the capacitive detection circuit in the embodiment of the present application illustrates.
Due at reseting stage and detection-phase, OPA buffer act as voltage follower, the input voltage of voltage follower is as the size of output voltage and phase place, so, in specific implementation process, it is believed that Cb both end voltage is constant, further, owing to, during whole detection, Cb not having electric charge shift, then it is believed that electric charge is only reallocated between Cfinger and Cdrive.
Specifically, the voltage on reseting stage, Cfinger be the quantity of electric charge of the upper storage of Vref, Cfinger be Q0=Cfinger × Vref.
And the voltage at Cdrive two ends is Vref, then the quantity of electric charge stored on Cdrive is Q1=Cdrive × (-Vref).
At detection-phase, after reseting stage terminates, before load driver signal, the voltage at Cfinger two ends keeps Vref constant, Q0=Cfinger × Vref.
And driving electric capacity Cdrive input terminal voltage Vdrive is Vdd, then final Cdrive two ends amount of charge stored is:
Q2=[Vdd-(-Vref)] × Cdrive=(Vdd+Vref) × Cdrive
Assume that the OPA buffer output voltage after final stablizing is X, then the change in electrical charge amount at Cfinger two ends is Δ Cf, Δ Cf=(X-Vref) × Cfinger, Cdrive change in electrical charge amount is Δ Cd, Δ Cd=(Vdd-X+Vref) × Cdrive.Owing to Cfinger with Cdrive change in electrical charge amount is identical, then there is Δ Cf=Δ Cd, i.e.
(X-Vref) × Cfinger=(Vdd-X+Vref) × Cdrive,
Can obtain, X=[Vref × Cfinger+ (Vdd+Vref) × Cdrive] ÷ (Cfinger+Cdrive).
In the embodiment of the present application, it is assumed that Cfinger1 (ridge)=1.05 × Cfinger0 (paddy)=Cdrive=C, Vref=Vdd/4；Then X (ridge)=0.750 × Vdd；X (paddy)=0.762 × Vdd；Then the voltage difference between fingerprint ridge fingerprint valley is: Δ Vsignal=X (paddy)-X (ridge)=0.012 × Vdd.
In the embodiment of the present application, as Vdd=5, Δ Vsignal=61mV, generally, the noise of the equivalent input noise of operational amplifier and switching capacity noise and less than 0.5mV, it is assumed that the signal to noise ratio of primary signal is SNR, then SNR=20 × log (61mv ÷ 0.5mv)=41.7dB, owing to signal to noise ratio is higher, so that fingerprint detection result will not be by effect of noise, more accurately.
In the embodiment of the present application, Fig. 7 is to carry out, according to above-mentioned capacitive detection circuit, the output waveform figure that emulation obtains, Fig. 8 is refinement output waveform figure, theoretical control output signal is as shown in Figure 6B, wherein, simulated conditions is Cfinger1 (ridge)=1.05 × Cfinger0 (paddy)=Cdrive=C, Vref=Vdd/4=1.25V.
Wherein, Vref is reset reference magnitude of voltage, and Vref=1.25V, S1 are reset switch control signal, and Vdrive is for driving signal, and Vdrive=5V, VTf_g are fingerprint valley convert of capacitor to voltage output waveform, and VTf_j is fingerprint ridge convert of capacitor to voltage output waveform.
Simulation result shows, the capacitance difference of corresponding 5%, after being converted into voltage according to Theoretical Calculation electric capacity, output voltage difference is 61mV, and the simulation result of reality is 60.89mV, and simulation result is consistent with notional result.
Embodiment two
The embodiment of the present application two provides a kind of fingerprint detection method, is applied to finger print detection device, and described finger print detection device includes: the multiple detector units arranged according to predetermined arranging rule, and the plurality of detector unit is for detecting the finger print information of user；Each detector unit in the plurality of detector unit includes: induction module, protection ring and driving module；Wherein, described protection ring is arranged on around described induction module, and described driving module is connected with described protection ring, and described driving module is used for driving described detector unit, as it is shown in figure 9, described method includes:
S10: when finger user being detected contacts the plurality of detector unit, according to preset rules, obtain the finger print information of each detector unit in the plurality of detector unit, wherein, described preset rules is each detector unit load driver signal according to preset order, obtains the finger print information of each fingerprint module.
S20: finger print information based on described each fingerprint module, obtains complete finger print information.
Specifically, after the detector unit 1 in multiple detector units has detected, the detector unit 2 continuation detection finger print information that detector unit 1 is laterally adjacent, then according to the rule of laterally detection, each module detects successively, until last detector unit.Certainly, in the embodiment of the present application, after detector unit 1 has detected, detector unit 1 of vertically-adjacent detector unit 10 continues detection finger print information, then according to the rule of vertical detection, carrying out successively detects each module, until last detector unit.The finger print information of the finger of user can be detected the most in the embodiment of the present application by different detection modes, so ensure the accuracy of fingerprint detection module detection fingerprint.
In the embodiment of the present application, described fingerprint identification device includes operational amplifier module, described operational amplifier module is for realizing the Buffer output of signal after electric capacity is converted to voltage, described according to preset rules, obtain the finger print information of each detector unit in the plurality of detector unit, specifically include:
Reseting stage, resets to the magnitude of voltage of first input end, the second input and the outfan of described operational amplifier module, arranges a reset reference magnitude of voltage；
Detection-phase, by induction module described in described driving module drive, the magnitude of voltage changing the first input end of described operational amplifier module, the second input and outfan is the second magnitude of voltage；
The output stage, according to described reset reference magnitude of voltage and the relation of described second magnitude of voltage, it is thus achieved that the first magnitude of voltage of described first detector unit output, described first magnitude of voltage is for characterizing the finger print information on the position that finger contacts with described first detector unit.
In the embodiment of the present application, the annexation of capacitive detection circuit is as shown in Figure 5, module is driven to include driving circuit section and drive capacitive part, driving circuit section is connected with driving capacitive part, capacitive part is driven to drive the transfer of the electric charge between capacitive part and the first inductance capacitance for realizing electric charge, when first inductance capacitance is finger touch fingerprint identification device, the inductance capacitance between finger and induction module.
Specifically, due at reseting stage and detection-phase, OPA buffer act as voltage follower, the input voltage of voltage follower as output voltage size and phase place, so, in specific implementation process, it is believed that Cb both end voltage is constant, further, due to during whole detection, electric charge is not had to shift on Cb, then it is believed that electric charge is only reallocated between Cfinger and Cdrive.
Specifically, the voltage on reseting stage, Cfinger be the quantity of electric charge of the upper storage of Vref, Cfinger be Q0=Cfinger × Vref.
And the voltage at Cdrive two ends is Vref, then the quantity of electric charge stored on Cdrive is Q1=Cdrive × (-Vref).
At detection-phase, after reseting stage terminates, before load driver signal, the voltage at Cfinger two ends keeps Vref constant, Q0=Cfinger × Vref.
And driving electric capacity Cdrive input terminal voltage Vdrive is Vdd, then final Cdrive two ends amount of charge stored is:
Q2=[Vdd-(-Vref)] × Cdrive=(Vdd+Vref) × Cdrive
In the output stage, assume that the OPA buffer output voltage after final stablizing is X, i.e. second magnitude of voltage is X, then the change in electrical charge amount at Cfinger two ends is Δ Cf, Δ Cf=(X-Vref) × Cfinger, Cdrive change in electrical charge amount is Δ Cd, Δ Cd=(Vdd-X+Vref) × Cdrive.Owing to Cfinger with Cdrive change in electrical charge amount is identical, then there is Δ Cf=Δ Cd, i.e.
(X-Vref) × Cfinger=(Vdd-X+Vref) × Cdrive,
Can obtain, X=[Vref × Cfinger+ (Vdd+Vref) × Cdrive] ÷ (Cfinger+Cdrive).
The application implements to assume Cfinger1 (ridge)=1.05*Cfinger0 (paddy)=Cdrive=C, Vref=Vdd/4；Then X (ridge)=0.750 × Vdd；X (paddy)=0.762 × Vdd；Then the voltage difference between fingerprint ridge fingerprint valley is:
Δ Vsignal=X (paddy)-X (ridge)=0.012 × Vdd.
In the embodiment of the present application, as Vdd=5, Δ Vsignal=61mV, generally, the noise of the equivalent input noise of operational amplifier and switching capacity noise and less than 0.5mV, it is assumed that the signal to noise ratio of primary signal is SNR, then SNR=20 × log (61mv ÷ 0.5mv)=41.7dB, owing to signal to noise ratio is higher, so that fingerprint detection result will not be by effect of noise, more accurately.
By the one or more technical schemes in the embodiment of the present application, it is possible to achieve following one or more technique effects:
In the scheme of the embodiment of the present application; each detector unit of finger print detection device is made up of induction module and the protection ring of himself; when detector unit detection finger print information; by load driver signal on the protection ring of each detector unit; this detector unit is driven; make in this programme without high drive; have only to load stable supply voltage; solve in prior art; finger print detection device needs high drive; the technical problem that power consumption is higher, it is achieved that reduce the technique effect of the power consumption of finger print detection device.
Further, since each detector unit of finger print detection device is made up of induction module and the protection ring of himself, then being formed fingerprint detection array by multiple such detector units, structure design is simpler.
Although having been described for the preferred embodiment of the application, but one of ordinary skilled in the art once knows basic creative concept, then these embodiments can be made other change and amendment.So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the application scope.
Obviously, those skilled in the art can carry out various change and modification without departing from the spirit and scope of the present invention to the present invention.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (9)
1. a finger print detection device, it is characterised in that described device includes:
The multiple detector units arranged according to predetermined arranging rule, the plurality of detector unit is used for detecting user
Finger print information；
Each detector unit in the plurality of detector unit includes:
Induction module, protection ring and driving module；Wherein, described protection ring is arranged on described induction module
Around, described driving module is connected with described protection ring, and described driving module is used for driving described detector unit.
2. device as claimed in claim 1, it is characterised in that the plurality of detector unit is according to predetermined
Arranging rule is arranged into rectangular array.
3. device as claimed in claim 1, it is characterised in that described induction module is arranged at described inspection
Surveying the ground floor of unit, described drive module setting is in the second layer of described detector unit, wherein, and described the
One layer of top being positioned at the described second layer.
4. device as claimed in claim 1, it is characterised in that described detector unit also includes:
Operational amplifier, described operational amplifier includes first input end and the second input, described first defeated
Entering end to be connected with described induction module, described second input is connected with described protection ring, described operation amplifier
Device is for realizing the Buffer output of signal after electric capacity is converted to voltage.
5. device as claimed in claim 4, it is characterised in that described detector unit also includes:
First switching device, second switch device, the first reset circuit and the second reset circuit；
Wherein, described first switching device includes that the first end and the second end, described first end are put with described computing
The first input end of big device connects, and described second end is connected with described first reset circuit, described second switch
Device includes the second input and the output of the 3rd end and the 4th end, described 3rd end and described operational amplifier
End connects, and described 4th end is connected with described second reset circuit, described first reset circuit and described second
Reset circuit is for first input end, the second input and the magnitude of voltage of outfan to described operational amplifier
Reset, a reset reference magnitude of voltage is set.
6. device as claimed in claim 5, it is characterised in that described driving module includes: drive electricity
Road part and driving capacitive part, described driving capacitive part and described induction module and described operational amplifier
First input end connect, described driving circuit section is connected with described driving capacitive part, wherein, described
Driving circuit section is used for driving described induction module, described driving capacitive part to be used for realizing electric charge described
Driving the electric charge transfer between capacitive part and the first inductance capacitance, described first inductance capacitance is that finger touches
Inductance capacitance during described fingerprint identification device, between finger and described induction module.
7. a fingerprint detection method, is applied to finger print detection device, it is characterised in that described fingerprint is examined
Survey device includes: the multiple detector units arranged according to predetermined arranging rule, and the plurality of detector unit is used for
The finger print information of detection user；Each detector unit in the plurality of detector unit includes: induction module,
Protection ring and driving module；Wherein, described protection ring is arranged on around described induction module, described driving
Module is connected with described protection ring, and described driving module is used for driving described detector unit, described method to include:
When finger user being detected contacts the plurality of detector unit, according to preset rules, obtain institute
Stating the finger print information of each detector unit in multiple detector unit, wherein, described preset rules is according to presetting
Order is each detector unit load driver signal, obtains the finger print information of each fingerprint module；
Finger print information based on described each fingerprint module, obtains complete finger print information.
8. method as claimed in claim 7, it is characterised in that described fingerprint identification device includes computing
Amplifier module, described operational amplifier module is defeated for realizing the buffering of signal after electric capacity is converted to voltage
Go out, described according to preset rules, obtain the finger print information of each detector unit in the plurality of detector unit,
Specifically include:
Reseting stage, to first input end, the second input and the outfan of described operational amplifier module
Magnitude of voltage resets, and arranges a reset reference magnitude of voltage；
Detection-phase, by induction module described in described driving module drive, changes described operation amplifier
The magnitude of voltage of the first input end of device module, the second input and outfan is the second magnitude of voltage；
The output stage, according to described reset reference magnitude of voltage and the relation of described second magnitude of voltage, it is thus achieved that described
First magnitude of voltage of the first detector unit output, described first magnitude of voltage is used for characterizing finger and described first inspection
Survey the finger print information on the position of unit contact.
9. method as claimed in claim 8, it is characterised in that described driving module includes drive circuit
Part and driving capacitive part, described driving circuit section is connected with described driving capacitive part, described driving
Capacitive part is driving the transfer of the electric charge between capacitive part and the first inductance capacitance for realizing electric charge, described
When first inductance capacitance is finger touch fingerprint identification device, the faradism between finger and described induction module
Hold.
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