CN107451573A - Composite fingerprint identification module, composite fingerprint recognition means and electronic equipment - Google Patents
Composite fingerprint identification module, composite fingerprint recognition means and electronic equipment Download PDFInfo
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- CN107451573A CN107451573A CN201710665985.3A CN201710665985A CN107451573A CN 107451573 A CN107451573 A CN 107451573A CN 201710665985 A CN201710665985 A CN 201710665985A CN 107451573 A CN107451573 A CN 107451573A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
Abstract
The present invention provides a kind of composite fingerprint identification module, composite fingerprint identification module includes one first piezoelectric layer, composite fingerprint identification module has the first recognition mode and the second recognition mode, under the first recognition mode, composite fingerprint identifies that module carries out fingerprint recognition with ultrasonic type fingerprint recognition principle, and first piezoelectric layer is at least used as ultrasonic wave receiving layer；Under the second recognition mode, composite fingerprint identifies that module carries out fingerprint recognition with capacitance type fingerprint recognition principle, and first piezoelectric layer is as capacitance dielectric layer.The present invention also provides the composite fingerprint recognition means and electronic equipment for including the composite fingerprint identification module.The composite fingerprint recognition means, composite fingerprint identification module and electronic equipment have the advantages that good environmental adaptability.
Description
【Technical field】
The present invention relates to fingerprint identification technology field, and in particular to a kind of composite fingerprint identification module, composite fingerprint
Recognition means and electronic equipment.
【Background technology】
With the development of fingerprint identification technology, it is widely used in electronic product, such as mobile phone, tablet personal computer, gate inhibition system
In system, to simplify the operation such as unblock or transaction payment, it has the advantages that swift to operate, safe.
The application environment of electronic product is changeable, and existing fingerprint recognition module can not well adapt to answering for electronic product
Fingerprint recognition is delicately completed with environment.For so that capacitance type fingerprint identifies module as an example, excessively moisten in user's finger or
Fingerprint recognition can not be then smoothly completed in the case of having spot.Therefore being badly in need of proposition being capable of the strong fingerprint recognition mould of environmental suitability
The shortcomings that group is to overcome existing fingerprint recognition module environmental suitability difference.
【The content of the invention】
The shortcomings that to overcome existing fingerprint recognition module environmental suitability difference, the present invention provide a kind of composite fingerprint identification
Module, composite fingerprint recognition means and electronic equipment.
The present invention provides a kind of composite fingerprint identification module, and composite fingerprint identification module includes one first piezoelectric layer,
Composite fingerprint identification module has the first recognition mode and the second recognition mode, under the first recognition mode, composite fingerprint
Identify that module carries out fingerprint recognition with ultrasonic type fingerprint recognition principle, first piezoelectric layer at least receives as ultrasonic wave
Layer；Under the second recognition mode, composite fingerprint identifies that module carries out fingerprint recognition with capacitance type fingerprint recognition principle, described the
One piezoelectric layer is as capacitance dielectric layer.
Preferably, the fingerprint recognition module includes TFT pel arrays, and TFT pel arrays are arranged on the first piezoelectric layer
Surface, the transmission that TFT enters horizontal electrical signal by grid and the first piezoelectric layer is defined, first in composite fingerprint identification module is known
Under other pattern, first piezoelectric layer receives ultrasound feedback signal and by the signal through grid transmission as ultrasonic wave receiving layer
To TFT；Capacity effect is formed under the second recognition mode, between finger and grid to produce capacitive feedback signal, capacitive feedback
Signal passes to TFT through grid.
Preferably, the electrode block being arranged between TFT gate and the first piezoelectric layer is further comprised.
Preferably, the first piezoelectric layer surface is provided with electrode layer, and electrode layer is vacancy section corresponding to TFT opening positions, multiple
Under first recognition mode of box-like fingerprint recognition module, the electrode layer is used to transmit driving voltage to the first piezoelectric layer so that first
Piezoelectric layer produces ultrasonic wave transmission signal.
Preferably, the composite fingerprint identification module further comprises ultrasonic transmitter, and the ultrasonic transmitter is set
Put in side of the TFT pel arrays away from the first piezoelectric layer；Or the ultrasonic transmitter is arranged on the first piezoelectric layer away from TFT pictures
The side of pixel array and insulating barrier is provided with to electrically isolate ultrasonic wave close to the side of the first piezoelectric film in ultrasonic transmitter
Transmitter and piezoelectric layer.
Preferably, the ultrasonic transmitter includes the second piezoelectric layer and electrode layer, and the electrode layer is arranged on the second pressure
The surface of electric layer, the electrode layer is used to transmit driving voltage to the second piezoelectric layer so that the second piezoelectric layer produces ultrasonic wave transmitting letter
Number.
Preferably, the TFT and TFT for receiving capacitive feedback signal for receiving ultrasound feedback signal is identical or different.
Preferably, the piezoelectric layer is the piezoelectric film in situ to polarize.
The present invention also provides a kind of composite fingerprint recognition means, and the composite fingerprint recognition means are including touch layer and such as
Upper described composite fingerprint identification module, one of surface of the touch layer is the touch surface operated for user,
The composite fingerprint identification module is set on another face relative with touch surface.
The present invention also provides a kind of electronic equipment, including composite fingerprint as described above identification module.
Compared with prior art, the present invention in provide composite fingerprint recognition means, composite fingerprint identification module and
Electronic equipment has capacitance type fingerprint identification and two kinds of fingerprint recognition patterns of ultrasonic type fingerprint recognition, both fingerprint recognition moulds
Can be good and bad complementary between formula, the environmental suitability of composite fingerprint identifier is substantially improved.Further, composite fingerprint identifies
Piezoelectric layer is provided with module, the piezoelectric layer serves as the component of difference in functionality to realize first device under two kinds of fingerprint recognition patterns
Part is multiplexed, and can effectively reduce product cost and product thickness.Under capacitance type fingerprint recognition mode, piezoelectric layer is as dielectric
Layer, because piezoelectric layer has larger dielectric constant, it can effectively increase the sensing sensitivity of capacitance type fingerprint identification.
Piezoelectric layer is both used as ultrasonic wave emission layer in the present embodiment, ultrasonic wave receiving layer is used as again, in this way, reducing generation
Cost and product thickness, there is provided the fingerprint recognition resolution ratio of product.
【Brief description of the drawings】
Fig. 1 is the layer structure schematic diagram of first embodiment of the invention composite fingerprint recognition means.
Fig. 2 is the layer structure of composite fingerprint identification module in first embodiment of the invention composite fingerprint recognition means
Schematic diagram.
Fig. 3 A are that first embodiment of the invention composite fingerprint recognition means carry out fingerprint with ultrasonic fingerprint recognition principle
The schematic diagram of identification.
Fig. 3 B are that first embodiment of the invention composite fingerprint recognition means carry out fingerprint with capacitance type fingerprint recognition principle
The schematic diagram of identification.
Fig. 4 is that composite fingerprint identification module is more detailed in first embodiment of the invention composite fingerprint recognition means
Structural representation.
Fig. 5 A are the distressed structure schematic diagrames of first embodiment of the invention composite fingerprint recognition means.
Fig. 5 B be first embodiment of the invention composite fingerprint recognition means distressed structure in electrode layer and TFT cooperation
Structural representation.
Fig. 6 is the layer structure schematic diagram of second embodiment of the invention composite fingerprint recognition means.
Fig. 7 is the layer structure schematic diagram of third embodiment of the invention composite fingerprint recognition means.
Fig. 8 A are that third embodiment of the invention composite fingerprint recognition means carry out fingerprint with ultrasonic fingerprint recognition principle
The schematic diagram of identification.
Fig. 8 B are that third embodiment of the invention composite fingerprint recognition means carry out fingerprint with capacitance type fingerprint recognition principle
The schematic diagram of identification.
Fig. 9 A are the layer structure schematic diagrames of fourth embodiment of the invention composite fingerprint recognition means.
Fig. 9 B are the circuit configurations of the TFT pixel array portions of composite fingerprint recognition means in fourth embodiment of the invention
Schematic diagram.
Figure 10 and Figure 11 is in a kind of fingerprint identification method of fifth embodiment of the invention corresponding to two kinds of different embodiments
Schematic flow sheet.
【Embodiment】
In order that the purpose of the present invention, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and embodiment,
The present invention will be described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
Referring to Fig. 1, first embodiment of the invention provides a kind of composite fingerprint recognition means 1, the composite fingerprint is known
Other device 1 is used to identify user fingerprints.Composite fingerprint recognition means 1 include touch layer 11 and composite fingerprint identification module
10, the touch layer 11 has relative upper and lower surface, and (the involved noun of locality is the phase in given view in the present invention
To position, rather than absolute position, it will be understood that turned clockwise in given view plane 90 ° when, the noun of locality " on " be changed into
" right side "), the upper surface of touch layer 11 is the touch surface for user's finger contacts, and the lower surface of touch layer 11 sets the combined type
Fingerprint recognition module 10.Composite fingerprint identification module 10 has the first recognition mode and the second recognition mode, in the first identification
Under pattern, composite fingerprint identification module 10 is entered with ultrasonic type fingerprint recognition principle to the finger operated on the touch surface
Row fingerprint recognition.Under the second recognition mode, composite fingerprint identifies module 10 with capacitance type fingerprint recognition principle to touching
The finger operated on face carries out fingerprint recognition.Composite fingerprint identification module 10 can identify in the first recognition mode and second
Switched between pattern.
Referring to Fig. 2, composite fingerprint identification module 10 includes electrode layer 13 successively from top to bottom, piezoelectric layer 15 and
TFT (Thin Film Transistor, thin film transistor (TFT), abbreviation TFT) plate 17, the piezoelectric layer 15 be arranged on electrode layer 13 with
Between TFT plates 17.TFT plates 17 include matrix 172, form the TFT being arranged in array on matrix 172 and some connection TFT
The pixel electrode (merging abbreviation TFT pel arrays 171) of grid, bearing bed of the matrix 172 as TFT pel arrays 171, array
The TFT pel arrays 171 of arrangement are arranged on matrix 172 on the surface of piezoelectric layer 15 and contacted with piezoelectric layer 15.Specifically,
Pixel electrode contacts with piezoelectric layer 15, and TFT enters the transmission of horizontal electrical signal by the pixel electrode and piezoelectric layer 15 that are connected with grid,
Selected as one kind, pixel electrode can omit, and TFT gate directly contacts with piezoelectric layer 15.Alternatively, the picture
Plain electrode is it also will be understood that a part as TFT gate, pixel electrode are contacted Ji Wei TFT gate and piezoelectric layer with piezoelectric layer 15
15 contacts.As another selection, pixel electrode is replaced by TFT gate.As another selection, TFT pel arrays 171 and pressure
The capacitive elements such as electrode block are put between electric layer 15, pass through the capacitive element between TFT pel arrays 171 and piezoelectric layer 15
Carry out signal transduction.
Electrode layer 13 is arranged on the upper surface of piezoelectric layer 15, and electrode layer 13 is used to transmit driving voltage to piezoelectric layer 15.It is excellent
Selection of land, the thickness of electrode layer 13 is 5-15um.Further preferred 5-8um.Engraving for some array arrangements is provided with electrode layer 13
Dead zone (not shown).The hollow out zone position of electrode layer 13 is with grid or is connected the pixel electrode position correspondence of grid.Using grid as
Example, it will be understood that upright projection of the grid on electrode layer 13 is located just in the vacancy section of electrode layer 13.
Piezoelectric layer 15 is piezoelectric film, and under the first recognition mode, piezoelectric layer 15 is the ultrasound for sending ultrasonic wave transmission signal
Ripple signal emission layer, while be also the ultrasound signal receipt layer for receiving ultrasound feedback signal.Piezoelectric layer 15 is in the second identification
Under pattern, it serves as dielectric layer.
Preferably, piezoelectric layer 15 is the piezoelectric film of polarization in situ, i.e., described piezoelectric layer 15 is by the way of being polarized using original position
Polarization is formed.Specially described piezoelectric layer 15 is that the one side that TFT pel arrays 171 are provided with matrix 172 is formed in situ piezoelectricity
Film, the piezoelectric film include relative first surface and second surface, and the first surface potential for making the piezoelectric film is zero；Described
Side where the second surface of piezoelectric film provides the first electric field and the second electric field, and the potential of the first electric field is higher than the electricity of the second electric field
Gesture；The environmental gas of the side where the piezoelectric film second surface is ionized in the presence of the first electric field, the environmental gas is worn
Cross the second electric field and be gathered in the second surface of piezoelectric film, make to form the electricity along the film in film thickness direction in the piezoelectric film
, polarization is carried out to the piezoelectric film and forms the piezoelectric layer 15.
In actual production, can be will using modes such as chemical vapor deposition, physical vapour deposition (PVD), plasma sputterings
Piezoelectric film is formed to be had on TFT matrix 172 in surface array.In the prior art, piezoelectric film typically by purchase it is existing into
Product are adhered on matrix 172 to be polarized by one layer of tack coat, and generally, the thickness of piezoelectric layer 15 that such a method is formed exists
More than 30 μm, the frivolous development trend of existing electronic device is not suitable with, and know using the composite fingerprint of this piezoelectric layer 15
Other module 10, because piezoelectric layer 15 is too thick, therefore resolution ratio is relatively low.And the piezoelectric layer 15 of the offer of the present invention is formed in situ in base
On body 172, therefore very thin thickness, and formation process is simple, so as to reduce the transmission loss of ultrasonic signal, is advantageous to improve
The resolution ratio of the fingerprint recognition of composite fingerprint identification module 10.Furthermore the present invention is compared to directly above and below piezoelectric layer 15
Surface sets electrode, and piezoelectric layer 15 will not be made directly to bear applied high voltage electric field, be avoided that piezoelectric layer 15 is breakdown.This hair
It is bright to be polarized using ion body polarization (Chinese patent application that for details, reference can be made to Application No. 201710108374.9) or X ray
The mode of (Chinese patent application that for details, reference can be made to Application No. 201611222575.3) forms the piezoelectric layer 15, is formed
Piezoelectric layer 15 can accomplish it is very thin, moreover, the piezoelectric layer 15 of the present invention piezo-electric effect is preferable and service life length, can
It is useful in well in composite fingerprint identification module 10, effect is identified beneficial to realizing that composite fingerprint identification module 10 is preferable
Fruit.In the present invention, the piezo-electric effect D of the piezoelectric layer 15 of polarization in situ has been carried out33Scope be 20-35pC/N.
The material of the piezoelectric layer 15 is piezoelectric, 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 invention, the copolymer of the material selection Kynoar of the piezoelectric layer 15 is poly- inclined
PVF-trifluoro-ethylene copolymer, in order to obtain the preferable piezoelectric layer 15 of piezo-electric effect, the Kynoar and trifluoro-ethylene
The scope of mass ratio be (60-95)：(5-30), it is preferable that the scope of its mass ratio is (75-86)：(15-25), further
Preferably, its mass ratio is 80：20, the Kynoar and trifluoro-ethylene copolymer can more individually be dropped from Kynoar
Low cost, and it also has preferable piezo-electric effect.
The thickness of the piezoelectric layer 15 is less than 30 μm, and its thickness may further be less than 9 μm, yet 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, 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.
The composite fingerprint identification module 10 has the following two kinds mode of operation：
Refer to Fig. 3 A, the composite fingerprint identification recognition mode of module 10 first：Composite fingerprint identifies module 10 with super
Sound wave type fingerprint recognition principle carries out fingerprint recognition.Specifically, a driving voltage is applied by electrode layer 13, makes the piezoelectric layer
15 produce vibration so as to send ultrasonic wave transmission signal.When touch surface has finger contact, the fingerprint of finger include fingerprint ridge and
Fingerprint valley, because fingerprint ridge directly contacts with touch surface, and there is air between fingerprint valley and touch surface, therefore make fingerprint ridge and refer to
It is different that line paddy corresponds to acoustic impedance values at touch surface, and the ultrasound feedback signal reflected at fingerprint ridge and fingerprint valley is not yet
Equally.Specifically, when the ultrasonic wave transmission signal is respectively transmitted in the touch surface and is reached the fingerprint ridge of finger and is referred to
Line paddy, at fingerprint ridge, the ultrasonic wave transmission signal part is absorbed by fingerprint ridge, and unabsorbed part forms the first ultrasound
Ripple feedback signal reflexes to piezoelectric layer 15；At fingerprint valley, the ultrasonic wave transmission signal almost all is reflected to form second
Feedback signal reflexes to piezoelectric layer 15, energy be present between the first ultrasound feedback signal and the second ultrasound feedback signal
Difference.The the first ultrasound feedback signal received and the second ultrasound feedback signal are converted into electric signal by the piezoelectric layer 15
Send the TFT being arranged in array to, the corresponding electric signal received by the TFT of diverse location can obtain by calculation process
Obtain fingerprint image corresponding to user's finger.
When touch surface contacts without finger, the ultrasonic wave transmission signal is sent in the touch surface and almost complete
The 3rd ultrasound feedback signal is reflected to form to piezoelectric layer 15, due to the 3rd ultrasound feedback signal reflected and is not present
Capacity volume variance, therefore, the electric signal that all TFT are received are identical, will not form fingerprint image.
The first ultrasound feedback signal, the second ultrasound feedback signal, the 3rd ultrasound feedback signal and ultrasound
Ripple transmission signal is the different expression form of ultrasonic signal, has difference specially on energy size, direction of transfer.Can
To understand, the present invention is only by taking the first ultrasound feedback signal, the second ultrasound feedback signal, the 3rd ultrasound feedback signal as an example
To carry out the explanation of ultrasonic fingerprint recognition principle, in fact, in fingerprint identification process, corresponding different fingerprint characteristic will produce
Raw some different ultrasound feedback signals.
Refer to Fig. 3 B, the composite fingerprint identification recognition mode of module 10 second：Composite fingerprint identifies module 10 with electricity
Appearance formula fingerprint recognition principle carries out fingerprint recognition.When user's finger is operated on the touch surface, because the electric current of human body senses
Effect, because capacity effect forms coupled capacitor C between finger and grid.Due to fingerprint ridge and fingerprint valley to TFT grid away from
From difference, therefore, the coupled capacitor C of formation size also differs, and caused coupled capacitor C is that user enters on the touch surface
Caused capacitive feedback signal after row operation.Capacitive feedback signal received by TFT can be obtained by calculation process
Fingerprint image corresponding to user's finger.When touch surface contacts without finger, capacitive feedback signal and indifference that TFT is received,
Therefore, fingerprint image will not be formed.In a second mode of operation, piezoelectric layer 15 exists as the dielectric layer of coupled capacitor.Can
To understand, coupled capacitor is not limited between grid and finger and produced, and it can also be produced between grid.
Refer to Fig. 4, composite fingerprint identification module 10 further comprise driving source 121 and, the and of first processing module 122
Second processing module 123, driving source 121 are connected with the electrode layer 13 of the top of piezoelectric layer 15, and it is used to provide driving voltage to pressure
Electric layer 15.First processing module 122 and Second processing module 123 are connected with the TFT in TFT pel arrays 171, are known first
Under other pattern, the ultrasound feedback signal received is passed to first processing module 122 and carries out computing by TFT pel arrays 171
Handle to obtain fingerprint image.Under the second recognition mode, capacitive feedback signal transmission that TFT pel arrays 171 will receive
Calculation process is carried out to Second processing module 123 to obtain fingerprint image.Deformed as one kind, the first processing module 122
Being replaced with Second processing module 123 using integrated processing module, the integrated processing module can both handle ultrasound feedback signal,
Capacitive feedback signal can be handled again, in this way, the integrated level of composite fingerprint identification module 10 can be lifted.Become as another kind
Shape, driving source 121 and first processing module 122 and/or Second processing module 123 integrate.
Further, can also include controller 124, the controller 124 and driving source 121 and first processing module 122 and
Second processing module 123 connects, and controller 124 controls composite fingerprint identification module 10 to enter with the first recognition mode as needed
Row fingerprint recognition carries out fingerprint recognition with the second recognition mode.Under the first recognition mode, driving source 121 and first handles mould
Block 122 works, and Second processing module 123 does not work；Under the second recognition mode, driving source 121 and first processing module 122 are not
Work, Second processing module 123 work.Selected as one kind, controller 124 is connected with a sensor 125, and sensor 125 is felt
The humidity of finger is surveyed, and identifies module 10 with the first recognition mode or second according to the moistening extent control composite fingerprint of finger
Recognition mode carries out fingerprint recognition.Specifically, when the humidity that sensor 125 senses finger is more than a humidity upper threshold value M, this
When, because finger excessively moistens, it is difficult to successfully recognize user fingerprints or fingerprint recognition overlong time under the second recognition mode, it is multiple
Box-like fingerprint recognition module 10 carries out fingerprint recognition using the first recognition mode.When sensor 125 senses the high humidity of finger
(M when humidity lower threshold value N>N), now, because finger is excessively dried, fingerprint recognition precision under the first recognition mode by
Influence, composite fingerprint identification module 10 carries out fingerprint recognition using the second recognition mode.When sensor 125 senses finger
When humidity is less than humidity upper threshold value M more than humidity lower threshold value N, it is preferred to use the second recognition mode carries out fingerprint recognition to save energy
Consumption.Preferably, after finger touches touch surface, fingerprint recognition is carried out with the second recognition mode first, after sensing finger humidity
Determine whether to keep continuing fingerprint recognition with the second recognition mode further according to finger humidity or be switched to the first recognition mode
Carry out fingerprint recognition.It is appreciated that controller 124 is not restricted to selection and switching according to humid control recognition mode, it is also
The selection and switching of recognition mode can be controlled according to the time, the result of fingerprint recognition etc..
Driving source 121 and first processing module 122 in this implementation, Second processing module 123, controller 124 and sensor
125 set-up mode is equally applicable to other embodiment.
Into holding state to drop when composite fingerprint identification module 10 is successfully completed after fingerprint recognition or touched without finger
Low energy consumption.
Compared with prior art, the composite fingerprint identification module in composite fingerprint recognition means has capacitance type fingerprint
Identification and two kinds of fingerprint recognition patterns of ultrasonic type fingerprint recognition, can be good and bad complementary between both fingerprint recognition patterns, greatly
Width lifts the environmental suitability of composite fingerprint identifier.Further, piezoelectric layer is provided with composite fingerprint identification module, should
Piezoelectric layer serves as the component of difference in functionality to realize that component is multiplexed under two kinds of fingerprint recognition patterns, can effectively reduce production
Product cost and product thickness.Under capacitance type fingerprint recognition mode, piezoelectric layer as dielectric layer, due to piezoelectric layer have it is larger
Dielectric constant, it can effectively increase the sensing sensitivity of capacitance type fingerprint identification.
Piezoelectric layer is both used as ultrasonic wave emission layer in the present embodiment, ultrasonic wave receiving layer is used as again, in this way, reducing generation
Cost and product thickness, there is provided the fingerprint recognition resolution ratio of product.
Fig. 5 A are referred to, the variant embodiment composite fingerprint for providing first embodiment composite fingerprint recognition means 1 is known
Other device 1a, it equally includes the touch layer 11a and composite fingerprint being arranged on below touch layer 11a identification module 10a.It is multiple
Box-like fingerprint recognition module 10a includes piezoelectric layer 15a, and electrode layer 13a and TFT plate 17a, TFT plate 17a includes matrix 171a and battle array
Row are arranged at the TFT on matrix 171a, define the transmission that TFT enters horizontal electrical signal by grid and piezoelectric layer 15a.Composite fingerprint
Recognition means 1a is only that electrode layer 13a position is different from the difference part of first embodiment composite fingerprint recognition means 1,
Specifically, in the variant embodiment, electrode layer 13a is arranged between TFT plates 17a and piezoelectric layer 15a.
Fig. 5 B are referred to, some vacancy section 131a are provided with electrode layer 13a.The vacancy section 131a positions of electrode layer 13 with
Gate location is corresponding, and grid electrically isolates with electrode layer 13, i.e., described not contact between the two.It is appreciated that grid is in electricity
Upright projection on the layer 13a of pole is located just in electrode layer 13a vacancy section 131a.That is TFT corresponds to electrode layer 13a hollow out
Area 131a is set, and TFT grid is exposed in the 131a of vacancy section to be contacted with piezoelectric layer 15a, but TFT grid and electrode layer
There is gap between 13a or be provided with dielectric so that both described electrically isolate.Composite fingerprint recognition means 1a work
Pattern and its principle are consistent with first embodiment.
Referring to Fig. 6, second embodiment of the invention provides a kind of composite fingerprint recognition means 2, the composite fingerprint is known
Other device 2 is used to identify user fingerprints.Composite fingerprint recognition means 2 include touch layer 21, and dielectric layer 22 and combined type refer to
Line identifies module 20, and the upper surface of touch layer 11 is the touch surface for user's finger contacts, and dielectric layer 22 is arranged on touch layer 21
Between composite fingerprint identification module 20.Fingerprint recognition mould disclosed in the composite fingerprint identification other embodiment of module 20
Group is identical.The dielectric layer 22 can be polaroid, diffusion sheet or liquid crystal layer etc..It is appreciated that composite fingerprint identifies module
Setting component is substantially needed between 20 and touch layer 21 according to product.As another deformation, the touch layer 21 can omit,
Dielectric layer 22 is the protective layer that the surface of module 20 is identified positioned at composite fingerprint.As further deformation, touch layer 21 and Jie
Matter layer 22 can omit, when touch layer 21 omits, it will be understood that the face of finger touching composite fingerprint identification module 20 is
For touch surface.Deformation in the present embodiment and the present embodiment is applied to other embodiment.
Referring to Fig. 7, third embodiment of the invention provides a kind of composite fingerprint recognition means 3, the composite fingerprint is known
Other device 3 is used to identify user fingerprints.Composite fingerprint recognition means 3 include touch layer 31 and composite fingerprint identification module
30, the touch layer 31 has relative upper and lower surface, and the upper surface of touch layer 31 is the touch for user's finger contacts
Face, the lower surface of touch layer 31 set the composite fingerprint identification module 30.Composite fingerprint identification module 30 has first
Recognition mode and the second recognition mode, under the first recognition mode, composite fingerprint identifies that module 30 is known with ultrasonic type fingerprint
Other principle carries out fingerprint recognition to the finger operated on the touch surface.Under the second recognition mode, composite fingerprint identification
Module 30 carries out fingerprint recognition with capacitance type fingerprint recognition principle to the finger operated on the touch surface.Composite fingerprint is known
Other module 10 can switch between the first recognition mode and the second recognition mode.
Please continue to refer to Fig. 7, composite fingerprint identification module 10 includes the first piezoelectric layer 35, TFT plates successively from top to bottom
37 and first electrode layer 33a, the second piezoelectric layer 32 and the second electrode lay 33b, the first piezoelectric layer 35 are arranged on touch layer 31 and TFT
Between plate 37.TFT plates 37 include the TFT pel arrays 371 that matrix 372 and some tft array are arranged, and matrix 372 is used as TFT pictures
The bearing bed of pixel array 371, the TFT pel arrays 371 of array arrangement are arranged on matrix 372 on the surface of piezoelectric layer 35 simultaneously
Contacted with piezoelectric layer 35.TFT is defined to contact with the first piezoelectric layer 35 by grid.Alternatively, the second piezoelectric layer 32
It is arranged on side of the TFT plates 37 away from the first piezoelectric layer 35, first electrode layer 33a and the second piezoelectric layers of the second electrode lay 33b 32
It is separately positioned on two relative surfaces of the second piezoelectric layer 32.
First electrode layer 33a and the second electrode lay 33b is conductive material, and the rwo coordinates for load driver voltage to
So that the second piezoelectric layer 32 is as the ultrasonic signal emission layer for sending ultrasonic wave transmission signal on two piezoelectric layers 32.As one kind
Deformation, first electrode layer 33a or the second electrode lay 33b can be omitted.
Second piezoelectric layer 32 is piezoelectric film, and under the first recognition mode, the second piezoelectric layer 32 is transmitting ultrasonic wave transmitting letter
Number ultrasonic signal emission layer.Preferably, the piezoelectric film that the second piezoelectric layer 32 polarizes for original position, i.e., described second piezoelectric layer 35
It is to polarize to be formed by the way of original position is polarized.
First piezoelectric layer 35 is piezoelectric film, and under the first recognition mode, the first piezoelectric layer 35 is believed to receive ultrasound feedback
Number ultrasound signal receipt floor.For first piezoelectric layer 35 under the second recognition mode, it serves as dielectric layer.Preferably, the first pressure
Electric layer 35 is the piezoelectric film of polarization in situ, i.e., described first piezoelectric layer 35 is to polarize to be formed by the way of original position is polarized.
Refer to Fig. 8 A, the composite fingerprint identification recognition mode of module 30 first：Composite fingerprint identifies module 30 with super
Sound wave type fingerprint recognition principle carries out fingerprint recognition.Specifically, driven by first electrode layer 33a and the second electrode lay 33b loadings
Dynamic voltage to the second piezoelectric layer 32, the second piezoelectric layer 32 produces vibration so as to send ultrasonic wave transmission signal.It is similarly real in first
The analysis on ultrasonic fingerprint recognition principle in example is applied, ultrasonic wave transmission signal is reflected to form ultrasonic wave after finger contact
Feedback signal is to the first piezoelectric layer 35.Energy difference be present in the ultrasound feedback signal reflected at fingerprint ridge and fingerprint valley
It is different.Different ultrasound feedback signals is converted into electric signal and sends the TFT being arranged in array to after being received by the first piezoelectric layer 35,
Corresponding electric signal received by the TFT of diverse location can obtain fingerprint image corresponding to user's finger by calculation process
Picture.When touch surface contacts without finger, ultrasound feedback signal and indifference that TFT is received, therefore, all TFT are received
Electric signal it is identical, fingerprint image will not be formed.
Refer to Fig. 8 B, the composite fingerprint identification recognition mode of module 30 second：Composite fingerprint identifies module 30 with electricity
Appearance formula fingerprint recognition principle carries out fingerprint recognition.When user's finger is operated on the touch surface, because the electric current of human body senses
Effect, coupled capacitor C is formed between finger and grid.Because the distance of fingerprint ridge and fingerprint valley to TFT gate is different, therefore,
The coupled capacitor C of formation size also differs, and caused coupled capacitor C is to be produced after user is operated on the touch surface
Capacitive feedback signal.User's finger can be obtained to the capacitive feedback signal received by TFT by calculation process to correspond to
Fingerprint image.When touch surface contacts without finger, capacitive feedback signal and indifference that TFT is received, therefore, all TFT
The electric signal received is identical, will not form fingerprint image.In a second mode of operation, the first piezoelectric layer 35 is used as coupling
The dielectric layer for closing electric capacity is present.
Refer to Fig. 9 A, fourth embodiment of the invention provides a kind of composite fingerprint recognition means 4, itself and 3rd embodiment
Middle composite fingerprint recognition means 3 are similar, and its combined type for equally including touch layer 41 and being arranged on below touch layer 41 refers to
Line identifies module 40.Composite fingerprint identification module 40 includes the first piezoelectric layer 45, TFT plates 47, first electrode layer 43a, and second
Piezoelectric layer 42 and the second electrode lay 43b.TFT plates 47 are arranged at the TFT pixel battle arrays on matrix 472 including matrix 472 and array
Row 471.The difference of the present embodiment composite fingerprint recognition means 4 and composite fingerprint recognition means 3 in 3rd embodiment
It is only that between the first piezoelectric layer 45 and TFT plates 47 and is provided with an electrode block array layer 44, the first piezoelectric layer 45 is to pass through electrode
Block array layer 44 carries out signal transduction with the TFT on TFT plates 47, and electrode block array layer 44 includes the electrode of some array distributions
Block 441, i.e. electrode block 441 are corresponded with TFT and set, and the first piezoelectric layer 45 is entered by electrode block and the TFT on TFT plates 47
Row signal transduction.Alternatively, electrode block 441 and TFT corresponded manner can be corresponded or more
The corresponding TFT of individual electrode block 441, or the corresponding multiple TFT of multiple electrodes block 441.The upper surface of preferred electrode block 441 and first
Piezoelectric layer 45 is contacted, and electrode block 441 and TFT is directly connected to, or electrode block 441 sets with TFT spacing and realized by being electrically coupled
Signal transduction, set by electrode block 441 and spacing between TFT exemplified by signal transduction is realized in a manner of coupling in the present embodiment
To illustrate.
Composite fingerprint identifies the recognition mode of module 40 first：Composite fingerprint identifies that module 40 is known with ultrasonic type fingerprint
Other principle carries out fingerprint recognition.The similarly analysis in first embodiment on ultrasonic fingerprint recognition principle, the second piezoelectric layer
The 42 ultrasonic wave transmission signals sent are reflected to form ultrasound feedback signal to the first piezoelectric layer 45 after finger contact.From finger
Capacity volume variance be present in the ultrasound feedback signal reflected at wrinkle ridge and fingerprint valley.Different ultrasound feedback signals are by first
Piezoelectric layer 45 is converted into electric signal after receiving and sends electrode block 441 to, and electric signal is conducted to by electrode block 441 again to be arranged in array
TFT.Corresponding electric signal received by the TFT of diverse location can be obtained corresponding to user's finger by calculation process
Fingerprint image.When touch surface contacts without finger, ultrasound feedback signal and indifference that TFT is received, therefore, all TFT
The electric signal received is identical, will not form fingerprint image.
Composite fingerprint identifies the recognition mode of module 40 second：Composite fingerprint identification module 30 is identified with capacitance type fingerprint
Principle carries out fingerprint recognition.When user's finger is operated on the touch surface, due to the electric current inductive effect of human body, finger and electricity
Coupled capacitor C is formed between pole block 441.Because the distance of fingerprint ridge and fingerprint valley to electrode block 441 is different, therefore, formation
Coupled capacitor C size also differs, and caused coupled capacitor C is caused electric capacity after user is operated on the touch surface
Feedback signal.Capacitive feedback signal transduction gives the TFT that is arranged in array, the corresponding electricity received by TFT at diverse location
Signal can obtain fingerprint image corresponding to user's finger by calculation process.When touch surface contacts without finger, TFT is received
The capacitive feedback signal and indifference arrived, therefore, the electric signal that all TFT are received is identical, will not form fingerprint image.
Preferably, the circuit of the part of TFT pel arrays 471 can be done such as the configuration in Fig. 9 B in the present embodiment.Specifically,
TFT includes a control terminal 4711a, and first end 4711b and the second end 4711c, control terminal 4711a are TFT gate, first end
4711b and the second end 4711c one of which are TFT source electrodes, and another one is TFT drain.First end 4711b is connected with pixel electricity
Pole 4711d.Electrode block 441 and TFT pixel electrode 4711d, which is corresponded, to be set, and realizes electric signal by coupling between the two
Transmission.TFT is arranged in arrays, and the horizontal direction for defining matrix is X-direction, and the longitudinal direction of matrix is Y-direction, X-direction and Y
Direction is mutually perpendicular to, it will be understood that X-direction and Y-direction are interchangeable.In the X direction, the TFT gate connection on same row
To same drives line 4831, the TFT of difference row grid is connected to drive module 483 by different drives lines 4831；It is located at
Electrode block 441 on same row is connected to excitation module 482 by cabling 4821, and the electrode block 441 of difference row is by different
Cabling 4821 is connected to excitation module 482.In the Y direction, the second end 4711c of the TFT on same row is connected to same
Signal wire 4811, the TFT of difference row are connected to processing module 481 by different signal wires 4811.Drive module 483 provides drive
Dynamic signal is so that TFT is maintained at working condition.Processing module 481 and excitation module 482 and electrode block 441 coordinate sensing because of hand
Refer to signal intensity caused by touching.Specifically, under the first recognition mode and the second recognition mode, ultrasound feedback signal or
Capacitive feedback signal is sensed by electrode block 441, is coupled between electrode block 441 and TFT first end 4711b to produce one
The signal of change, the signal are processed when TFT is opened detected by module 481 and excitation module 482, and the feature of the signal is
The fingerprint characteristic of corresponding finger.The signal characteristic that the electrode block 441 of diverse location senses is different, and different signal characteristics passes through
Calculation process can obtain fingerprint image corresponding to user's finger.
It is appreciated that electrode block 441 can omit with pixel electrode 4711d.In addition, electrode block 441 and pixel electrode
4711d (or first end 4711b) can be set in the same plane, can also be between the upper and lower away from setting.It is appreciated that the present embodiment
In circuit configuration mode go for other embodiment according to actual conditions.
Because the area of electrode block 441 is relative to the area increase of TFT gate in the present embodiment, it can more delicately feel
Accurate sensitive fingerprint recognition should be realized in the touch control operation of finger.
It is appreciated that disclosed in the present embodiment by setting up electrode block 441 to improve the scheme of fingerprint recognition spirit lightness
It is equally applicable to the variant embodiment composite fingerprint recognition means 1a of first embodiment.It is appreciated that composite fingerprint identifies
Electrode block can also be set in device 1a, and piezoelectric layer 15a carries out signal transduction by the TFT on electrode block and TFT plates 17a.
Electrode block is arranged in electrode layer 13a vacancy section 131a, and electrode block does not contact with electrode layer 13a, i.e., both electrically isolate.Electricity
One surface of pole block is contacted with piezoelectric layer 15a, and another surface of electrode block directly can be connected with TFT gate directly to carry out signal
Conduction, or electrode block set with TFT spacing and realize signal transduction by being electrically coupled.
It is appreciated that, there is provided the composite fingerprint recognition means described in implementing more than any one, a triggering thing occurs
Part may be such that composite fingerprint identification module switches between the first recognition mode and the second recognition mode and carry out fingerprint knowledge
Not.The trigger event is not limited to detect excessively moistening or excessively drying or the failure of fingerprint recognition or when having arrived setting for finger
Between etc..
It is appreciated that due to the fingerprint recognition pattern that the second recognition mode is passive type, combined type under the first recognition mode
The energy consumption of fingerprint recognition device is larger, and therefore, the composite fingerprint identification module in above example is first using the second identification
Pattern carries out fingerprint recognition, if the fingerprint recognition under the second recognition mode is failed, then is switched to the first recognition mode and enters
Row fingerprint recognition.
It is appreciated that in the embodiment above, the TFT of ultrasound feedback signal is received with receiving capacitive feedback signal
TFT is identical or differs.When receiving TFT differences of the TFT of ultrasound feedback signal with receiving capacitive feedback signal, receive
The TFT of ultrasound feedback signal and the TFT of reception capacitive feedback signal are connected respectively to same processing module or different disposal mould
Block.
It is appreciated that the electrode block could alternatively be other capacitive elements.
It is appreciated that except ultrasonic wave emission layer and ultrasonic wave receiving layer for the situation of same layer except, ultrasonic wave emission layer
The electrode layer that ultrasonic wave transmission signal is sent with excitation ultrasound ripple emission layer can be replaced using existing ultrasonic transmitter
To launch ultrasonic wave transmission signal.Ultrasonic transmitter can be arranged on side of the TFT pel arrays away from piezoelectric layer；Can also
It is arranged on side of the piezoelectric layer away from TFT pel arrays and the side of piezoelectric layer is provided with insulating barrier in ultrasonic transmitter
To electrically isolate ultrasonic transmitter and piezoelectric layer.
The composite fingerprint identification module provided in above example may apply to including but not limited to：Mobile phone, notes
This computer, tablet PC, printer, duplicator, scanner, picture unit, global positioning system (GPS) receiver/lead
Navigate instrument, 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, calculating
Machine monitor, automotive displays (including mileometer and speedometer displays etc.), driving cabin control and/or display, camera regard
Figure display (for example, display of the rear view camera in vehicle), electronic photo, board, bulletin or label, projecting apparatus, building
Structure, refrigerator, stereophonic sound system, cassette recorder or player, DVD player, CD Player, VCR, radio device, just
Take formula memory chip, washing machine, dryer, washing/drying machine, parking meter etc..
Referring to Fig. 10, fifth embodiment of the invention provides a kind of composite fingerprint recognition methods, the composite fingerprint is known
The composite fingerprint identification module that other method can be, but not limited to use in above-described embodiment is completed, with using the in the present embodiment
The explanation of fingerprint identification method is carried out exemplified by composite fingerprint identification module in one embodiment.
The composite fingerprint recognition methods includes：
First recognition mode：Fingerprint recognition is carried out with ultrasonic type fingerprint recognition principle；
Second recognition mode：Fingerprint recognition is carried out with capacitance type fingerprint recognition principle；
In fingerprint identification process, cutting between the first recognition mode and the second recognition mode is controlled according to trigger event
Change, and fingerprint recognition is completed with the first recognition mode or the second recognition mode.
Referring to Fig. 10, trigger event can be fingerprint recognition turkey.When finger touches touch surface, fingerprint is known
Other method comprises the following steps：
Step S1：Using capacitance type fingerprint recognition principle opponent's fingering row fingerprint recognition.
Step S2：Judge whether fingerprint recognition succeeds；If fingerprint recognition is unsuccessful then to enter step S3, i.e., according to triggering
The switching of the generation control fingerprint recognition pattern of event；If fingerprint recognition success then enters step S4.
Step S3：Using ultrasonic type fingerprint recognition principle opponent's fingering row fingerprint recognition.
Step S4：Terminate.
Step S1 can be the initial step of fingerprint recognition, and one and step S3 identicals can also be performed before step S1
Step.
Figure 11 is referred to, trigger event can be that finger is excessively moistened or excessively dried.When finger touches touch surface,
Fingerprint identification method comprises the following steps：
Step T1：Using capacitance type fingerprint recognition principle opponent's fingering row fingerprint recognition.
Step T2：Obtain finger humidity X；The mode for obtaining finger humidity value X includes but is not limited to carry out using sensor
Sensing.
Step T3：Judge that finger moistens degree；It is provided with a humidity upper threshold value M and humidity lower threshold value a N, M>N.Work as X>M
When, i.e., finger excessively moistens, and performs step T4, i.e. fingerprint recognition pattern has carried out fingerprint recognition pattern because finger excessively moistens
Switching；Work as X<During N, i.e., finger is excessively dried, and performs step T5；If during N≤X≤M, i.e. finger humidity is moderate, performs step
Rapid T5.
Step T4:Using ultrasonic type fingerprint recognition principle opponent's fingering row fingerprint recognition；I.e. still using the first identification
Pattern continues fingerprint recognition.
Step T5：Using capacitance type fingerprint recognition principle opponent's fingering row fingerprint recognition.
Step T6：Terminate.
It is appreciated that step T1 and step T2, T3 are to carry out simultaneously.Deformed as another kind, step T1 can be omitted, i.e., first
Obtain finger humidity and according to the specific fingerprint recognition pattern of humidity reselection.Step T1 can be deformed into:Referred to using ultrasonic type
Line recognition principle opponent's fingering row fingerprint recognition.Now in step T3, finger is dry or finger humidity it is moderate be trigger event,
It can trigger the switching of fingerprint recognition pattern.
During step T3, in the event of the situation of fingerprint recognition failure, then fingerprint recognition failure can turn into triggering
Event is to trigger switching of first recognition mode to the second recognition mode.Fingerprint recognition failure is specific it is considered that in setting time
Inside fail completion fingerprint recognition and be considered as fingerprint recognition failure, or the fingerprint image detected and the fingerprint image progress n to prestore
Mismatched after (n takes positive integer) contrast and be considered as fingerprint recognition failure.
It is appreciated that when finger contacts touch surface, fingerprint recognition first can be carried out with the first recognition mode, can also be with
Second recognition mode carries out fingerprint recognition, it is preferable that first carries out fingerprint recognition with the first recognition mode.
It is appreciated that in a fingerprint identification process, the first recognition mode was both employed and has carried out fingerprint recognition to obtain
First fingerprint image, the second recognition mode is employed again and carries out fingerprint recognition to obtain the second fingerprint image, with the first fingerprint image
Relatively sharp fingerprint image is as final fingerprint recognition result in picture or the second fingerprint image.
Compared with prior art, fingerprint identification method provided by the present invention uses the side of two kinds of fingerprint recognition pattern switchings
Formula, can in different environment adaptability adjustment fingerprint recognition pattern to complete fingerprint recognition.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all originals in the present invention
Any modification made within then, equivalent substitution and improvement etc. all should be included within protection scope of the present invention.
Claims (10)
1. a kind of composite fingerprint identifies module, it is characterised in that：Composite fingerprint identification module includes one first piezoelectric layer, multiple
Box-like fingerprint recognition module has the first recognition mode and the second recognition mode, and under the first recognition mode, composite fingerprint is known
Other module carries out fingerprint recognition with ultrasonic type fingerprint recognition principle, and first piezoelectric layer is at least used as ultrasonic wave receiving layer；
Under the second recognition mode, composite fingerprint identify module with capacitance type fingerprint recognition principle carry out fingerprint recognition, described first
Piezoelectric layer is as capacitance dielectric layer.
2. composite fingerprint as claimed in claim 1 identifies module, it is characterised in that：The fingerprint recognition module includes TFT
Pel array, TFT pel arrays are arranged on the surface of the first piezoelectric layer, define TFT and carry out electricity by grid and the first piezoelectric layer
The transmission of signal, under the first recognition mode of composite fingerprint identification module, first piezoelectric layer receives as ultrasonic wave
Layer receives ultrasound feedback signal and the signal is passed into TFT through grid；Under the second recognition mode, between finger and grid
Capacity effect is formed to produce capacitive feedback signal, capacitive feedback signal passes to TFT through grid.
3. composite fingerprint as claimed in claim 2 identifies module, it is characterised in that：Further comprise being arranged on TFT gate
And the first electrode block between piezoelectric layer.
4. composite fingerprint as claimed in claim 2 identifies module, it is characterised in that：First piezoelectric layer surface is provided with electrode
Layer, electrode layer is vacancy section corresponding to TFT opening positions, under the first recognition mode of composite fingerprint identification module, the electrode
Layer is used to transmit driving voltage to the first piezoelectric layer so that the first piezoelectric layer produces ultrasonic wave transmission signal.
5. composite fingerprint as claimed in claim 2 identifies module, it is characterised in that：The composite fingerprint identification module enters
One step includes ultrasonic transmitter, and the ultrasonic transmitter is arranged on side of the TFT pel arrays away from the first piezoelectric layer；Or should
Ultrasonic transmitter is arranged on side of first piezoelectric layer away from TFT pel arrays and in ultrasonic transmitter close to the first piezoelectricity
The side of film is provided with insulating barrier to electrically isolate ultrasonic transmitter and piezoelectric layer.
6. the composite fingerprint identification module described in claim 5, it is characterised in that：The ultrasonic transmitter includes the second pressure
Electric layer and electrode layer, the electrode layer are arranged on the surface of the second piezoelectric layer, and the electrode layer is used to transmit driving voltage to second
Piezoelectric layer is so that the second piezoelectric layer produces ultrasonic wave transmission signal.
7. composite fingerprint as claimed in claim 2 identifies module, it is characterised in that：Receive the TFT of ultrasound feedback signal
It is identical or different with the TFT of reception capacitive feedback signal.
8. composite fingerprint as claimed in claim 1 identifies module, it is characterised in that：The piezoelectric layer is the pressure in situ to polarize
Electrolemma.
A kind of 9. composite fingerprint recognition means, it is characterised in that：The composite fingerprint recognition means include touch layer and as weighed
Profit requires the composite fingerprint identification module described in any one of 1-8, and one of surface of the touch layer is to be carried out for user
The touch surface of operation, the composite fingerprint identification module is set on another face relative with touch surface.
10. a kind of electronic equipment, it is characterised in that：Mould is identified including the composite fingerprint as described in claim any one of 1-8
Group.
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