CN207517029U - Composite fingerprint identifies module and electronic equipment - Google Patents
Composite fingerprint identifies module and electronic equipment Download PDFInfo
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- CN207517029U CN207517029U CN201721022690.6U CN201721022690U CN207517029U CN 207517029 U CN207517029 U CN 207517029U CN 201721022690 U CN201721022690 U CN 201721022690U CN 207517029 U CN207517029 U CN 207517029U
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Abstract
The utility model provides a kind of composite fingerprint identification module, including composite fingerprint identification module and switch module, the composite fingerprint identification module is electrically connected with the switch module, composite fingerprint identification module has the first recognition mode and the second recognition mode, under the first recognition mode, composite fingerprint identification module carries out fingerprint recognition with ultrasonic type fingerprint recognition principle, under the second recognition mode, composite fingerprint identification module carries out fingerprint recognition with capacitance type fingerprint recognition principle；The switch module control composite fingerprint identification module switches between the first recognition mode and the second recognition mode.The utility model also provides the electronic equipment using composite fingerprint identification module.Composite fingerprint identification module and electronic equipment have many advantages, such as good environmental adaptability in the utility model.
Description
【Technical field】
The utility model is related to fingerprint identification technology fields, and in particular to a kind of composite fingerprint identification module and electronics are set
It is standby.
【Background technology】
At present, fingerprint identification technology such as has been widely used in mobile terminal, smart home, has fought crime at the multiple fields.
Many facility and safety are brought to people’s lives.The fingerprint identification technology of present mainstream has light fingerprint recognition, condenser type
Fingerprint recognition and ultrasonic fingerprint identification, but they also have the shortcomings that respective, such as light fingerprint recognition and capacitance type fingerprint are known
There are not greasy dirt, dust in finger, water when substances is easy for that fingerprint image can not be parsed；And ultrasonic fingerprint recognition is for dry hand
The discrimination of finger is very low.Therefore, existing fingerprint recognition module is difficult to adapt to different environment, our urgent needs seek one kind can
Suitable for the fingerprint recognition module under varying environment.
【Utility model content】
Environmental suitability to overcome the problems, such as existing fingerprint recognition module is poor, and the utility model, which provides composite fingerprint, to be known
Other module and electronic equipment.
Technical solution is to provide a kind of composite fingerprint identification mould used by the utility model solves above-mentioned technical problem
Group, including composite fingerprint identification module and switch module, the composite fingerprint identification module and switch module electricity
Property connection, composite fingerprint identification module have the first recognition mode and the second recognition mode, it is compound under the first recognition mode
Formula fingerprint identification module carries out fingerprint recognition, under the second recognition mode, composite fingerprint with ultrasonic type fingerprint recognition principle
Identification module carries out fingerprint recognition with capacitance type fingerprint recognition principle；The composite fingerprint identification module include upper electrode layer,
Piezoelectric layer and lower electrode layer, upper electrode layer and lower electrode layer are separately positioned on two opposite surfaces of piezoelectric layer, top electrode
Layer includes the top electrode block of array arrangement, and at least once electrode block, top electrode block are correspondingly arranged with lower electrode block, switch module packet
Multiple switch unit is included, each top electrode block and lower electrode block connect a switch unit, the switch unit control respectively
Composite fingerprint identification module switches between the first recognition mode and the second recognition mode.
Preferably, the lower electrode layer includes the lower electrode block of array arrangement, and top electrode block is corresponded with lower electrode block
Setting connects a switch unit respectively per electrode block once.
Preferably, the signal that composite fingerprint identification module further comprises at least being acquired capacitive feedback signal is adopted
Collect module, signal acquisition module includes multiple signal gathering units, and signal gathering unit is a pair of with top electrode block one by switch
It should connect.
Preferably, the switch unit includes at least one switch, and top electrode block and lower electrode block are opened by described at least one
The switching of pass may be connected to GND, VDD and Vx, wherein Vx<VDD.
Preferably, under the first recognition mode, composite fingerprint identification module includes initial shift：Top electrode block and
Lower electrode block meets GND to realize that charge is reset, the second working stage：Lower electrode block meets GND, and top electrode block is alternately connect with pressure difference
Two voltage signals excitation piezoelectric layer generate ultrasonic wave transmitting signal；Third working stage：Top electrode block connects a fixed electricity
Signal is pressed, lower electrode block connects signal gathering unit, and ultrasonic reflections signal encounters finger back reflection and generates ultrasound feedback back
Ultrasound feedback signal is converted into being transferred to the signal gathering unit connecting with lower electrode block after electric signal by signal, piezoelectric layer.
Preferably, under the second recognition mode, composite fingerprint identification module includes initial shift：Top electrode block and
Lower electrode block meets GND to realize that charge is reset, the second working stage：Top electrode block and lower electrode block connect VDD, top electrode block and hand
Parasitic capacitance charging between finger；Third working stage：Top electrode block connects signal gathering unit and Vx, and lower electrode block meets Vx, letter
Number collecting unit acquires the discharge signal of the parasitic capacitance.
Preferably, the lower electrode block that the lower electrode layer includes is set for the single top electrode block corresponding to the array arrangement
The electrode block put or the electrode blocks being arranged in a one-to-one correspondence for multiple and array arrangement top electrode block, switch module include
Multiple switch unit, composite fingerprint identification module further comprise adopting ultrasound feedback signal and capacitive feedback signal
The signal acquisition module of collection, lower electrode block is by switch unit connectable to GND, VDD and Vx, and each top electrode block is by even opening
It closes unit and may be connected to GND, VDD, Vx and signal acquisition module.
Preferably, the piezoelectric layer is polarization film in situ.
Preferably, the composite fingerprint identification module further comprises signal processing module, the signal processing module
The signal that signal acquisition module transmits is handled to obtain fingerprint recognition image.
The utility model also provides a kind of electronic equipment, which includes composite fingerprint identification as described above
Module.
Compared with prior art, composite fingerprint identification module includes using ultrasonic type to refer in the utility model
Line recognition principle carries out fingerprint recognition, and capacitance type fingerprint recognition principle can be used to carry out fingerprint recognition, in this way, substantially increasing
The environmental suitability of fingerprint recognition.Further, the application arbitrarily switches two kinds of recognition modes by switch module, simply
It is convenient.
Electronic equipment using composite fingerprint identification module has the advantages that fingerprint recognition is accurate.
【Description of the drawings】
Fig. 1 is the layer structure schematic diagram of the utility model first embodiment composite fingerprint identification module.
Fig. 2 is the circuit modular structure schematic diagram of the utility model first embodiment composite fingerprint identification module.
Fig. 3 is the structure diagram of the utility model first embodiment composite fingerprint identification module.
Fig. 4 is the particular circuit configurations schematic diagram of the utility model first embodiment composite fingerprint identification module.
Fig. 5 is the deformation signal of the particular circuit configurations of the utility model first embodiment composite fingerprint identification module
Figure.
Fig. 6 is the layer structure schematic diagram of the utility model second embodiment composite fingerprint identification module.
Fig. 7 is the circuit modular structure schematic diagram of the utility model second embodiment composite fingerprint identification module.
Fig. 8 is the structure diagram of the utility model second embodiment composite fingerprint identification module.
Fig. 9 is the particular circuit configurations schematic diagram of the utility model second embodiment composite fingerprint identification module.
【Specific embodiment】
In order to make the purpose of this utility model, technical solution and advantage are more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to solve
The utility model is released, is not used to limit the utility model.
Referring to Fig. 1, the utility model first embodiment composite fingerprint identifies that module 10 is identified including composite fingerprint
Module 10a and control circuitry layer 17, control circuitry layer 17 are arranged on (the utility model below composite fingerprint identification module 10a
Mentioned in up and down wait the nouns of locality be only limitted to the relative position in given view rather than absolute position, it will be understood that refer to
Determine view planar carry out 180 ° rotation after, position word " under " can replace with position word " on ").It is appreciated that control
The position of circuit layer 17 can need to be adjusted according to the practical layout of product, can be arranged on composite fingerprint identification mould
The left side of block 10a, right side or lower right side etc..
Referring to Fig. 2, control circuitry layer 17 and composite fingerprint identification module 10a is electrically connected, and specifically, control electricity
Road floor 17 include switch module 171,173 and one signal processing module 175 of signal acquisition module, signal processing module 175 with
Signal acquisition module 173 and composite fingerprint identification module 10a are electrically connected successively, and switch module 171 is also connected to compound
Formula fingerprint identification module 10a.Composite fingerprint identification module 10a has the first recognition mode and the second recognition mode, first
Under recognition mode, composite fingerprint identification module 10a carries out fingerprint recognition with ultrasonic type fingerprint recognition principle, knows second
Under other pattern, composite fingerprint identification module 10a carries out fingerprint recognition with capacitance type fingerprint recognition principle；The switch module
171 control composite fingerprint identification module 10a are switched between the first recognition mode and the second recognition mode.Signal acquisition
Module 173 acquire come from composite fingerprint identification module 10a generation corresponding to finger print information signal and be passed along letter
Number processing module 175 is handled to obtain fingerprint image.Switch module 171 can be according to temperature, humidity of environment etc. to multiple
The recognition mode of box-like fingerprint identification module 10a switches over, and can also be switched over according to current fingerprint recognition process,
Such as, in setting time, when not succeeded with the first recognition mode progress fingerprint recognition, then switch module controls composite fingerprint
Identification module 10a is switched to the second recognition mode；Or signal processing module 175 confirms that fingerprint recognition fails under current recognition mode
When, switch module control composite fingerprint identification module 10a is switched to another recognition mode.
Referring to Fig. 3, composite fingerprint identification module 10a includes upper electrode layer 11, piezoelectric layer 13 and lower electrode layer
15, upper electrode layer 11 and lower electrode layer 15 are separately positioned on two opposite surfaces of piezoelectric layer 13, and control circuitry layer 17 is set
In side of the lower electrode layer 15 far from piezoelectric layer 13.Specifically, upper electrode layer 11 includes the top electrode block 111 of array arrangement, under
Electrode layer 15 includes the lower electrode block 151 of array arrangement, and top electrode block 111 is arranged in a one-to-one correspondence with lower electrode block 151, i.e., on
Projection of the electrode block 111 on lower electrode layer 15 is at least partly be overlapped with lower electrode block 151, it is preferable that top electrode block 111 exists
Projection on lower electrode layer 15 is consistent with lower 151 area size of electrode block, and is just overlapped.
Piezoelectric layer 13 is piezoelectric film, it is preferable that piezoelectric layer 13 is polarized piezoelectric film in situ, i.e., described piezoelectric layer 13 is to adopt
It is polarized to be formed with polarized mode in situ.Specially described piezoelectric layer 13 is to be formed in situ piezoelectric film, the pressure on one side in matrix
Electrolemma includes opposite first surface and second surface, and the first surface potential for making the piezoelectric film is zero；In the piezoelectric film
Side where second surface provides the first electric field and the second electric field, and the potential of the first electric field is higher than the potential of the second electric field；First
The environmental gas of the side where the piezoelectric film second surface is ionized under the action of electric field, which passes through the second electric field
And the second surface of piezoelectric film is gathered in, make to form the film internal electric field along film thickness direction in the piezoelectric film, to the pressure
Electrolemma carries out polarization and forms the piezoelectric layer 13.
In actual production, can be will using modes such as chemical vapor deposition, physical vapour deposition (PVD), plasma sputterings
Piezoelectric film is formed on matrix.In the prior art, piezoelectric film is typically to be glued by purchasing existing finished product by one layer of adhesive layer
It is attached on matrix to polarize, in general, 13 thickness of piezoelectric layer that such method is formed is not suitable with existing electricity at 30 μm or more
The frivolous development trend of sub- device, and using the composite fingerprint identification module 10 of this piezoelectric layer 13, due to piezoelectric layer 13
It is too thick, therefore resolution ratio is relatively low.And the piezoelectric layer 13 of the offer of the utility model is formed in situ on matrix, therefore thickness is very
It is thin, and formation process is simple, so as to reduce the transmission loss of signal, is conducive to improve the finger of composite fingerprint identification module 10
The resolution ratio of line identification.Furthermore the utility model sets electrode compared to directly in the upper and lower surface of piezoelectric layer 13, will not make pressure
Electric layer 13 directly bears applied high voltage electric field, is avoided that piezoelectric layer 13 is breakdown.Gas ions pole can be used in the utility model
Change (for details, reference can be made to the Chinese patent application application No. is 201710108374.9) or X ray polarization (for details, reference can be made to application
Number be 201611222575.3 Chinese patent application) mode form the piezoelectric layer 13, the piezoelectric layer 13 formed can
Accomplish very thin, moreover, the piezoelectric effect of the piezoelectric layer 13 of the utility model is preferable and service life is long, can be good at being applicable in
In composite fingerprint identifies module 10, conducive to composite fingerprint identification 10 preferable recognition effect of module is realized.This practicality is new
In type, the ranging from 20-35pC/N of the piezoelectric effect D33 of the polarized piezoelectric layer 13 in situ has been carried out.
The material of the piezoelectric layer 13 is piezoelectric material, specific to can be selected but be not limited to：Kynoar, polyvinyl chloride,
Poly-γ-methyl-L-glutamate, one or several kinds of combinations in makrolon, polyvinylidene fluoride copolymer.
In some embodiments of the utility model, the copolymer of the material selection Kynoar of the piezoelectric layer 13 is
Kynoar-trifluoro-ethylene copolymer, in order to obtain the preferable piezoelectric layer 13 of piezoelectric effect, the Kynoar and trifluoro
The range of the mass ratio of ethylene is (60-95)：(5-30), it is preferable that the range of its mass ratio is (75-86)：(15-25), into
One step preferably, mass ratio 80：20, the Kynoar and trifluoro-ethylene copolymer more individually select Kynoar
Cost can be reduced, and it also has preferable piezoelectric effect.
The thickness of the piezoelectric layer 13 is less than 30 μm, and thickness may further be less than 9 μm, still further, its thickness
Can be 1.5-7.4 μm, 1.9-7.2 μm, 2.2-8.6 μm, 2.8-8.4 μm or 3.6-6.6 μm, it further, can be specific
It is 1.8 μm, 2.4 μm, 2.6 μm, 3.7 μm, 3.9 μm, 4.2 μm, 4.6 μm, 5.6 μm, 5.8 μm, 6.7 μm, 8.6 μm, 8.7 μm.
Fig. 3 and 4 are please referred to, switch module 171 includes multiple switch unit 1711, multiple switch unit 1711 and top electrode
Block 111 and lower electrode block 151 connect one to one, that is, each top electrode block 111 and every electrode block 151 once are respectively connected with
One switch unit 1711.Switch unit 1711 includes at least one switch, top electrode block 111 and lower electrode block 151 by it is described extremely
The switching of a few switch may be connected to GND, VDD and Vx.Specifically, the switch that the switch module 171 includes can be one
It is or multiple.It is illustrated so that switch unit 1711 is including 3 switches as an example in the utility model.
Signal acquisition module 173 include multiple signal gathering units 1731, signal gathering unit 1731 by switch Sp with
Top electrode block 111 connects one to one, i.e., each top electrode block 111 connects a signal gathering unit 1731.Signal gathering unit
1731 are connected one to one by switching St with lower electrode block 151, i.e., connect a signal gathering unit per electrode block 151 once
1731。
Please continue to refer to Fig. 3 and Fig. 4, with a top electrode block 111 and a lower electrode connecting valve unit 1711 and letter
The explanation of composite fingerprint identification module 10a operation principles is carried out for number collecting unit 1731.Top electrode block 111 connects
The switch unit 1711 connect includes switching S1, S2 and S3, and S1, S2 and S3 one end is connected to top electrode block 111, and in addition one
End is connected respectively to VDD (operating voltage), GND (ground voltage) and Vx (medium voltage).The switch list that lower electrode block 151 is connected
Member 1711 includes switching S4, S5 and S6, and S4, S5 and S6 one end are connected to lower electrode block 151, and other end connects respectively
To VDD, GND and Vx.Vx<VDD, it is preferable that Vx=(0.3-0.7) VDD, further preferably, Vx=(0.3-0.5) VDD.
Under the first recognition mode, composite fingerprint identification module 10 includes initial shift：S2, S5 conducting are switched,
Top electrode block 111 and lower electrode block 151 meet GND to realize that charge is reset；Second working stage：Switch S5 is tended to remain on,
S1 and S2 alternate conductions are switched, that is, electrode block 151 is descended to meet GND, top electrode block 111 alternately meets VDD and GND to generate square wave letter
Number excitation piezoelectric layer 13 generate ultrasonic wave transmitting signal；Preferably, the frequency of square-wave signal is 1~10MHz.Third work rank
Section：S2, St conducting are switched, top electrode block 111 meets GND, and lower electrode block 151 connects signal gathering unit 1731, ultrasonic reflections letter
Number encounter finger back reflection generates ultrasound feedback signal back, after ultrasound feedback signal is converted into electric signal by piezoelectric layer 13
It is transferred to the signal gathering unit 1731 being connect with lower electrode block 151.Preferably, the first stage under the first identification module,
Two-stage and phase III carry out successively.
Under the second recognition mode, composite fingerprint identification module 10 includes initial shift：S2, S5 conducting are switched,
Top electrode block 111 and lower electrode block 151 meet GND to realize that charge is reset.Second working stage：S1, S4 conducting are switched, is powered on
Pole block 111 and lower electrode block 151 meet VDD, and lower electrode block 151 and lower electrode block 151 connect same level signal, such piezoelectric layer
13 electric field would not occur, be interfered so as to which piezoelectric layer 13 is avoided to generate ultrasonic wave transmitting signal with generating.Top electrode block 111
Parasitic capacitance Cx between finger charges.Third working stage：S3, S6, Sp conducting are switched, due to Vx<VDD, therefore, hand
Refer to the parasitic capacitance discharge between top electrode block 111, signal gathering unit 1731 acquires the electric discharge letter of the parasitic capacitance Cx
Number, it is specially discharge charge, the number of discharge charge has corresponded to different finger print informations.Signal processing module 175 is according to letter
The 1731 collected discharge signals of institute of number collecting unit can operation obtain fingerprint image.Preferably, under the second identification module
First stage, second stage and phase III carry out successively.
As a kind of deformation, in the phase III of the first recognition mode, top electrode block 111 is not limited to connection GND voltage,
It can also be connection VDD or Vx voltages, as long as upper link block 111 connects a fixed voltage as reference signal, to be somebody's turn to do
Fixed voltage can be GND, VDD or Vx.
As a kind of deformation, the signal gathering unit 1731 being connect with lower electrode can be omitted, the third of the first recognition mode
In stage, Sp conductings, S5 or S4 or S6 conductings, ultrasound feedback signal are transferred to after being converted into electric signal by piezoelectric layer 13
The signal gathering unit 1731 being connect with top electrode 111.
Referring to Fig. 5, as a kind of deformation, the signal gathering unit 1731 being connect with lower electrode is omitted, lower electrode block 151
For the electrode of monolithic, and the lower electrode block 151 is corresponding with the top electrode block 111 of the array arrangement in upper electrode layer, that is, lower electrode
Layer is a flood.
It is appreciated that in the first recognition mode, switch S1 and S2 alternate conductions are to provide for one and alternately change
Voltage signal to piezoelectric layer 13 with generate ultrasonic wave transmitting signal.
Variant embodiment in the present embodiment is applicable to other embodiment according to actual conditions.
Referring to Fig. 6, the utility model second embodiment composite fingerprint identifies that module 20 is identified including composite fingerprint
Module 20a and control circuitry layer 27, control circuitry layer 27 are arranged on (the utility model below composite fingerprint identification module 20a
Mentioned in up and down wait the nouns of locality be only limitted to the relative position in given view rather than absolute position, it will be understood that refer to
Determine view planar carry out 180 ° rotation after, position word " under " can replace with position word " on ").It is appreciated that control
The position of circuit layer 27 can need to be adjusted according to the practical layout of product, can be arranged on composite fingerprint identification mould
The left side of block 20a, right side or lower right side etc..
Referring to Fig. 7, control circuitry layer 27 and composite fingerprint identification module 20a is electrically connected, and specifically, control electricity
Road floor 27 include switch module 271,273 and one signal processing module 275 of signal acquisition module, signal processing module 275 with
Signal acquisition module 273 and composite fingerprint identification module 20a are electrically connected successively, and switch module 271 is also connected to compound
Formula fingerprint identification module 20a.Composite fingerprint identification module 20a has the first recognition mode and the second recognition mode, first
Under recognition mode, composite fingerprint identification module 20a carries out fingerprint recognition with ultrasonic type fingerprint recognition principle, knows second
Under other pattern, composite fingerprint identification module 20a carries out fingerprint recognition with capacitance type fingerprint recognition principle；The switch module
271 control composite fingerprint identification module 20a are switched between the first recognition mode and the second recognition mode.Signal acquisition
Module 273 acquire come from composite fingerprint identification module 20a generation corresponding to finger print information signal and be passed along letter
Number processing module 275 is handled to obtain fingerprint image.Switch module 271 can be according to temperature, humidity of environment etc. to multiple
The recognition mode of box-like fingerprint identification module 20a switches over, and can also be switched over according to current fingerprint recognition process,
Such as, in setting time, when not succeeded with the first recognition mode progress fingerprint recognition, then switch module controls composite fingerprint
Identification module 20a is switched to the second recognition mode；Or signal processing module 275 confirms that fingerprint recognition fails under current recognition mode
When, switch module control composite fingerprint identification module 20a is switched to another recognition mode.
Please continue to refer to Fig. 8, composite fingerprint identification module 20a includes upper electrode layer 21, piezoelectric layer 22, middle electrode layer 23
And lower electrode 24, upper electrode layer 21 and middle electrode layer 23 are separately positioned on two opposite surfaces of piezoelectric layer 22, lower floor
24 spacing of electrode is arranged on middle side of the electrode layer 23 far from piezoelectric layer 22.Specifically, upper electrode layer 21 includes array arrangement
Top electrode block 211, middle electrode layer 23 include the middle electrode block 231 of array arrangement, and lower electrode layer 24 includes the lower electricity of array arrangement
Pole block 241,242, top electrode block 211 are arranged in a one-to-one correspondence with middle electrode block 231, i.e., top electrode block 211 is on middle electrode layer 23
Projection it is at least partly be overlapped with middle electrode block 231, it is preferable that projection of the top electrode block 211 on middle electrode layer 23 and middle electricity
Block 231 area size in pole is consistent, and is just overlapped.Each top electrode block 211 and middle 231 corresponding twice electrode blocks of electrode block
241,242, it will be understood that top electrode block 211 or middle electrode block 231 include two pieces in the view field on lower electrode layer 24
Lower electrode block 241,242.It is first to enable twice electrode blocks 241,242 of corresponding same top electrode block 211 or middle electrode block 231
Lower electrode block 241 and second time electrode block 242.
Piezoelectric layer 22 is piezoelectric film, it is preferable that piezoelectric layer 22 is polarized piezoelectric film in situ.
Fig. 8 and Fig. 9 are please referred to, switch module 27 includes multiple switch unit 2711, and multiple switch unit 2711 is with powering on
Pole block 211, middle electrode block 231 and lower electrode block connect one to one, that is, each top electrode block 211, middle electrode block 231 with
And lower electrode block is respectively connected with a switch unit 2711.Switch unit 2711 includes at least one switch, top electrode block 211 and lower electricity
Pole block may be connected to GND, VDD and Vx by the switching of described at least one switch.Specifically, the switch module 271 includes
Switch can be one or more.It is illustrated so that switch unit 2711 is including 3 switches as an example in the utility model.
Signal acquisition module 273 include multiple signal gathering units 2731, signal gathering unit 2731 by switch Sp with
Top electrode block 211 connects one to one, i.e., each top electrode block 211 connects a signal gathering unit 2731.Signal gathering unit
2731 are connected one to one by switching St with middle electrode block 231, i.e., each middle electrode block 231 connects a signal gathering unit
2731。
Please continue to refer to Fig. 9, with a top electrode block 211 and a middle electrode connecting valve unit 2711 and signal acquisition
Unit 2731, the first time electrode block 241 and second time electrode block being correspondingly arranged with the top electrode block 211 and lower electrode block
242 are all connected with carrying out the explanation of composite fingerprint identification module 20a operation principles for a switch unit.Top electrode block 211
The switch unit 2711 connected includes switching S1, S2 and S3, and S1, S2 and S3 one end are connected to top electrode block 211, in addition
One end is connected respectively to VDD, GND and Vx.The switch unit 2711 that middle electrode block 231 is connected include switch S4, S5 and
S6, S4, S5 and S6 one end are connected to lower electrode block, and other end is connected respectively to VDD, GND and Vx.First time electrode block
241 switch units 2711 connected include switching S7, S8 and S9, and S7, S8 and S9 one end are connected to first time electrode block
241, other end is connected respectively to VDD, GND and Vx.The switch unit 2711 that second time electrode block 242 is connected includes out
S10, S11 and S12 are closed, S10, S11 and S12 one end are connected to second time electrode block 242, and other end is connected respectively to
VDD, GND and Vx.Vx<VDD, it is preferable that Vx=(0.3-0.7) VDD, further preferably, Vx=(0.3-0.5) VDD.
Under the first recognition mode, composite fingerprint identification module 10 includes initial shift：Switch S2, S5, S8,
S11 is connected, and top electrode block 211, middle electrode block 231, first time electrode block 241 and second time electrode block 242 meet GND to realize
Charge is reset.Second working stage：Switch S5, S8, S11 are tended to remain on, and switch S1 and S2 alternate conductions, i.e., middle electrode
Block 231, first time electrode block 241 and second time electrode block 242 meet GND, and top electrode block 211 alternately meets VDD and GND with the side of generation
Wave signal excitation piezoelectric layer 22 generates ultrasonic wave transmitting signal；Preferably, the frequency of square-wave signal is 1~10MHz.Third work
Make the stage：S2, St, S8, S11 conducting are switched, i.e., top electrode block 211, first time electrode block 241 and second time electrode block 242 connect
GND, middle electrode block 231 connect signal gathering unit 2731, and ultrasonic reflections signal encounters finger back reflection and generates ultrasonic wave back
Ultrasound feedback signal is converted into being transferred to the letter connecting with middle electrode block 231 after electric signal by feedback signal, piezoelectric layer 22
Number collecting unit 2731.Preferably, first stage, second stage and the phase III under the first identification module carry out successively.
Under the second recognition mode, composite fingerprint identification module 20 includes initial shift：Switch S2, S5, S8,
S11 is connected, and top electrode block 211, middle electrode block 231, first time electrode block 241 and second time electrode block 242 meet GND to realize
Charge is reset.Second working stage：Switch S1, S4, S7, S11 conducting, top electrode block 211, middle electrode block 231 and first time electricity
Pole block 241 connects VDD, top electrode block 211 and middle electrode block 231 and first time electrode block 241 connects same level signal, this
Electric field would not occur in sample piezoelectric layer 22, so as to which piezoelectric layer 22 is avoided to generate ultrasonic wave transmitting signal to generate interference, in
The capacitance C1 formed between electrode block 231 and first time electrode block 241 does not work.Between top electrode block 211 and finger
Parasitic capacitance Cx and charge；Second time electrode block 242 connects GND voltage, middle electrode block 231 and second time electrode block
Capacitance C2 chargings between 242.Third working stage：S3, S6, S8, S11, Sp conducting are switched, due to Vx<VDD, therefore, capacitance
C2 discharges to capacitance C1, and the parasitic capacitance Cx electric discharges between finger and top electrode block 211, signal gathering unit 2731
The discharge signal of the parasitic capacitance Cx is acquired, is specially discharge charge, the number of discharge charge has corresponded to different fingerprints
Information.Signal processing module 175 can operation acquisition fingerprint according to the 2731 collected discharge signal of institute of signal gathering unit
Image.Preferably, first stage, second stage and the phase III under the second identification module carry out successively.
As a kind of deformation, in the phase III of the first recognition mode, top electrode block 211211 is not limited to connection GND electricity
Pressure can also be connection VDD or Vx voltages, as long as upper link block 211 connects a fixed reference signal.
As a kind of deformation, the signal gathering unit 2731 being connect with middle electrode block 231 can be omitted, the first recognition mode
Phase III in, Sp conducting, middle electrode block 231, first time electrode block 241 and second time electrode block 242 connect VDD or GND or
Vx voltages.Ultrasound feedback signal is converted into being transferred to the signal acquisition connecting with top electrode after electric signal by piezoelectric layer 22
Unit 2731.Middle electrode layer can also be further deformed into the form of a flood.
It is appreciated that in the first recognition mode, switch S1 and S2 alternate conductions are to provide for one and alternately change
Voltage signal to piezoelectric layer 22 with generate ultrasonic wave transmitting signal.The voltage signal of top electrode block 211 is supplied to be not limited to
VDD and GND can also be any other two voltage signals with pressure difference.
As a kind of deformation, in the phase III of the first recognition mode, top electrode block 111 is not limited to connection GND voltage,
It can also be connection VDD or Vx voltages, as long as upper link block 111 connects a fixed voltage as reference signal, to be somebody's turn to do
Fixed voltage can be GND, VDD or Vx.
As a kind of deformation, the signal gathering unit 2731 being connect with middle electrode can be omitted, the third of the first recognition mode
In stage, Sp conductings, middle electrode block and lower electrode block are connected to GND, and ultrasound feedback signal is converted into electricity by piezoelectric layer 22
The signal gathering unit 2731 being connect with top electrode 211 is transferred to after signal, in the deformation, middle electrode block 231 can be single
The electrode of block, i.e. lower electrode layer are a flood.
Preferably, top electrode block 211 is identical with middle 231 size of electrode block, and lower 241,242 area of electrode block is middle electrode block
The 30%-45% of 231 areas.Further preferably 38%-42%.
Compared with prior art, the present embodiment not only has in first embodiment possessed by composite fingerprint identification module
Advantage, meanwhile, because composite fingerprint identification module increases lower electrode layer 24 in the present embodiment, lower electrode layer 24 can be promoted
The signal stabilization of middle electrode layer 23, so as to improve the precision of fingerprint recognition.
The utility model 3rd embodiment provides a kind of fingerprint recognition module with position detecting, including as described above
Composite fingerprint identifies module, and the composite fingerprint identification module further comprises signal processing module, the signal processing
Module includes a fingerprint recognition processing module and position signal processing module, and the fingerprint recognition processing module is to signal acquisition
The signal that module transfer comes is handled to obtain fingerprint recognition image, and the position signal processing module is to signal acquisition mould
The signal that block transmits is handled to obtain finger manipulation position.
The utility model fourth embodiment provides a kind of electronic equipment, which includes combined type as described above
Fingerprint recognition module.The electronic equipment can be mobile phone, notebook computer, tablet computer, printer, duplicator, scanning
Instrument, picture unit, global positioning system (GPS) receiver/navigator, camera, digital media player, personal digital assistant
(PDA), field camera, game console, watch, clock, calculator, televimonitor, flat-panel monitor, electronic reading
Device (for example, electronic reader), mobile health care device, computer monitor, automotive displays (include mileometer and speedometer
Display etc.), cockpit control and/or display, camera view display (for example, the display of the rear view camera in vehicle
Device), electronic photo, board, bulletin or label, projecting apparatus, building structure, refrigerator, stereophonic sound system, cassette recorder or broadcast
Put device, DVD player, CD Player, VCR, radio device, pocket memory chip, washing machine, dryer, washing machine
/ dryer, parking meter etc..
Certain switch conductions specified mentioned in the utility model are this means that other switches disconnect.
Compared with prior art, composite fingerprint identification module includes using ultrasonic type to refer in the utility model
Line recognition principle carries out fingerprint recognition, and capacitance type fingerprint recognition principle can be used to carry out fingerprint recognition, in this way, substantially increasing
The environmental suitability of fingerprint recognition.Further, the application arbitrarily switches two kinds of recognition modes by switch module, simply
It is convenient.
Fingerprint recognition module with position detecting can also carry out position detecting while fingerprint recognition is realized so that band
Under conditions of feature-rich, integrated level improves the fingerprint recognition module of position detecting.
Electronic equipment using composite fingerprint identification module has the advantages that fingerprint recognition is accurate.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Any modification made within the principle of utility model, equivalent replacement and improvement etc. should all include the scope of protection of the utility model
Within.
Claims (10)
1. a kind of composite fingerprint identifies module, it is characterised in that：Including composite fingerprint identification module and switch module, institute
It states composite fingerprint identification module to be electrically connected with the switch module, composite fingerprint identification module has the first recognition mode
With the second recognition mode, under the first recognition mode, composite fingerprint identification module is carried out with ultrasonic type fingerprint recognition principle
Fingerprint recognition, under the second recognition mode, composite fingerprint identification module carries out fingerprint recognition with capacitance type fingerprint recognition principle；
The composite fingerprint identification module includes upper electrode layer, piezoelectric layer and lower electrode layer, upper electrode layer and lower electrode layer difference
It being arranged on two opposite surfaces of piezoelectric layer, upper electrode layer includes the top electrode block of array arrangement, at least once electrode block, on
Electrode block is correspondingly arranged with lower electrode block, and switch module includes multiple switch unit, each top electrode block and lower electrode block difference
A switch unit is connected, the switch unit control composite fingerprint identification module is identified in the first recognition mode and second
It is switched between pattern.
2. composite fingerprint as described in claim 1 identifies module, it is characterised in that：The lower electrode layer includes array arrangement
Lower electrode block, top electrode block is arranged in a one-to-one correspondence with lower electrode block, and a switch unit is connected respectively per electrode block once.
3. composite fingerprint as claimed in claim 2 identifies module, it is characterised in that：Composite fingerprint identification module is further
Including the signal acquisition module being at least acquired to capacitive feedback signal, signal acquisition module includes multiple signal acquisition lists
Member, signal gathering unit are connected one to one by switching with top electrode block.
4. composite fingerprint as claimed in claim 2 identifies module, it is characterised in that：The switch unit is opened including at least one
It closes, top electrode block and lower electrode block may be connected to GND, VDD and Vx, wherein Vx by the switching of described at least one switch<VDD.
5. composite fingerprint as claimed in claim 3 identifies module, it is characterised in that：Under the first recognition mode, combined type
Fingerprint recognition module includes initial shift：Top electrode block and lower electrode block meet GND to realize that charge is reset, the second work rank
Section：Lower electrode block meets GND, and top electrode block alternately connects two voltage signals excitation piezoelectric layer with pressure difference and generates ultrasonic wave transmitting
Signal；Third working stage：Top electrode block connects a fixed voltage signal, and lower electrode block connects signal gathering unit, and ultrasonic wave is anti-
It penetrates signal and encounters finger back reflection and generate ultrasound feedback signal back, ultrasound feedback signal is converted into electric signal by piezoelectric layer
It is transferred to the signal gathering unit being connect with lower electrode block afterwards.
6. composite fingerprint as claimed in claim 3 identifies module, it is characterised in that：Under the second recognition mode, combined type
Fingerprint recognition module includes initial shift：Top electrode block and lower electrode block meet GND to realize that charge is reset, the second work rank
Section：Top electrode block and lower electrode block meet VDD, the parasitic capacitance charging between top electrode block and finger；Third working stage：It powers on
Pole block connects signal gathering unit and Vx, and lower electrode block meets Vx, and signal gathering unit acquires the discharge signal of the parasitic capacitance.
7. composite fingerprint as described in claim 1 identifies module, it is characterised in that：The lower electrode that the lower electrode layer includes
Electrode block that block is set for the single top electrode block corresponding to the array arrangement is multiple powering on the array arrangement
The electrode block that pole block is arranged in a one-to-one correspondence, composite fingerprint identification module further comprise anti-to ultrasound feedback signal and capacitance
The signal acquisition module that feedback signal is acquired, lower electrode block may be connected to GND, VDD and Vx by switch unit, each to power on
Pole block may be connected to GND, VDD, Vx and signal acquisition module by even switch unit.
8. the composite fingerprint identification module as described in claim 2 or 7, it is characterised in that：The piezoelectric layer polarizes to be in situ
Film.
9. the composite fingerprint identification module as described in claim 2 or 7, it is characterised in that：The composite fingerprint identifies mould
Group further comprises signal processing module, and the signal processing module handles the signal that signal acquisition module transmits
To obtain fingerprint recognition image.
10. a kind of electronic equipment, which is characterized in that the electronic equipment is included as claim 1-7 any one of them is compound
Formula fingerprint recognition module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721022690.6U CN207517029U (en) | 2017-08-15 | 2017-08-15 | Composite fingerprint identifies module and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721022690.6U CN207517029U (en) | 2017-08-15 | 2017-08-15 | Composite fingerprint identifies module and electronic equipment |
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|---|---|
| CN207517029U true CN207517029U (en) | 2018-06-19 |
Family
ID=62532214
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721022690.6U Active CN207517029U (en) | 2017-08-15 | 2017-08-15 | Composite fingerprint identifies module and electronic equipment |
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| Country | Link |
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| CN (1) | CN207517029U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110163085A (en) * | 2019-04-08 | 2019-08-23 | 杭州士兰微电子股份有限公司 | The polarization method of sensor module |
| WO2021093384A1 (en) * | 2019-11-12 | 2021-05-20 | 神盾股份有限公司 | Fingerprint recognition device and fingerprint recognition method |
-
2017
- 2017-08-15 CN CN201721022690.6U patent/CN207517029U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110163085A (en) * | 2019-04-08 | 2019-08-23 | 杭州士兰微电子股份有限公司 | The polarization method of sensor module |
| CN110163085B (en) * | 2019-04-08 | 2021-07-09 | 杭州士兰微电子股份有限公司 | Polarization method of sensor assembly |
| WO2021093384A1 (en) * | 2019-11-12 | 2021-05-20 | 神盾股份有限公司 | Fingerprint recognition device and fingerprint recognition method |
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