CN108776797A - A kind of fingerprint recognition circuit and its driving method, display device - Google Patents
A kind of fingerprint recognition circuit and its driving method, display device Download PDFInfo
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- CN108776797A CN108776797A CN201810717685.XA CN201810717685A CN108776797A CN 108776797 A CN108776797 A CN 108776797A CN 201810717685 A CN201810717685 A CN 201810717685A CN 108776797 A CN108776797 A CN 108776797A
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- 238000010586 diagram Methods 0.000 description 9
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- 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
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Abstract
The embodiment of the present invention provides a kind of fingerprint recognition circuit and its driving method, display device, wherein the fingerprint recognition circuit includes：At least one ultrasonic transducer, output control sub-circuit and commutation sub-circuit；Output control sub-circuit is used under the control of control node and output control terminal, to the signal for reading signal end the first power end of offer；The electric signal that commutation sub-circuit is used to receive control node carries out rectification；Ultrasonic transducer, which is used to provide ultrasonic transducer to control node, receives electric signal caused by the ultrasonic wave of reflection, and commutation sub-circuit includes：The control pole of first switch transistor, first switch transistor is connect with control node or second source end, and the first pole is connect with control node, and the second pole is connect with second source end.The embodiment of the present invention reduces the quantity for the mask plate that fingerprint recognition circuit is made, and not only simplifies the manufacture craft of fingerprint recognition circuit, also as save cost.
Description
Technical field
The present embodiments relate to ultrasonic technology fields, and in particular to a kind of fingerprint recognition circuit and its driving method,
Display device.
Background technology
Living things feature recognition is technology for distinguishing different biological features, including fingerprint, palmmprint, face or iris etc.
Identification technology.Fingerprint refers to that concave-convex different lines, the regular arrangement form of lines are different on the finger tips skin of people
Line type.Fingerprint recognition carries out identity authentication by comparing the details of different fingerprints.Since ultrasonic wave is known for fingerprint
Other effect is good, and more and more producers are dedicated to fingerprint recognition circuit of the research using ultrasonic wave.
Through inventor the study found that the ultrasonic wave that existing fingerprint recognition circuit receives reflection using diode pair generates
Electric signal carry out rectification, since the side of diode is doping to p-type, the other side is doping to N-type, not only causes fingerprint recognition
The manufacture craft of circuit is more complex, also creates the waste of cost.
Invention content
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of fingerprint recognition circuit and its driving method,
Display device simplifies the manufacture craft of fingerprint recognition circuit, saves cost.
In a first aspect, an embodiment of the present invention provides a kind of fingerprint recognition circuits, including：At least one ultrasonic wave transducer
Device, output control sub-circuit and commutation sub-circuit；
The output controls sub-circuit, connects respectively with control node, the first power end, output control terminal and reading signal end
It connects, under the control of control node and output control terminal, the signal of the first power end to be provided to reading signal end；
The commutation sub-circuit is connect respectively with control node and second source end, for receive control node
Electric signal carries out rectification；
The ultrasonic transducer, connect with control node, is connect for providing the ultrasonic transducer to control node
Receive electric signal caused by the ultrasonic wave of reflection；
Wherein, the commutation sub-circuit includes：First switch transistor, the control pole of the first switch transistor and control
Node or second source processed end connects, and the first pole is connect with control node, and the second pole is connect with second source end.
Optionally, further include：First reset subcircuit and the second reset subcircuit；
First reset subcircuit connect with third power end, the first reset terminal and reading signal end, is used for respectively
Under the control of first reset terminal, to the signal for reading signal end offer third power end；
Second reset subcircuit is connect with second source end, the second reset terminal and control node respectively, for the
Under the control of two reset terminals, the signal at second source end is provided to control node.
Optionally, the output control sub-circuit includes：Second switch transistor and driving transistor；
The control pole of the second switch transistor is connect with output control terminal, and the first of the first pole and driving transistor
Pole connects, and the second pole is connect with signal end is read；
The control pole of the driving transistor is connect with control node, and the second pole is connect with the first power end；
First reset subcircuit includes：Third switching transistor；
The control pole of the third switching transistor is connect with the first reset terminal, and the first pole is connect with third power end,
Its second pole is connect with signal end is read；
Second reset subcircuit includes：4th switching transistor；
The control pole of 4th switching transistor is connect with the second reset terminal, and the first pole is connect with second source end,
Its second pole is connect with control node.
Optionally, first switch transistor, second switch transistor, third switching transistor and the 4th switching transistor are equal
For P-type TFT；
Wherein, the control pole of the first switch transistor is connect with control node.
Optionally, first switch transistor, second switch transistor, third switching transistor and the 4th switching transistor are equal
For N-type TFT；
Wherein, the control pole of the first switch transistor is connect with second source end.
Optionally, the ultrasonic transducer includes：First electrode, second electrode and setting are in the first electrode and institute
State the piezoelectric layer between second electrode；
Wherein, the control node is connect with the first electrode or the second electrode.
Second aspect, the embodiment of the present invention also provide a kind of display device, including above-mentioned fingerprint recognition circuit.
The third aspect, the embodiment of the present invention also provide a kind of driving method of fingerprint recognition circuit, apply in above-mentioned fingerprint
In identification circuit, including：
Ultrasonic transducer provides the ultrasonic transducer to control node and receives caused by the ultrasonic wave of reflection
Electric signal；
The electric signal that commutation sub-circuit receives control node carries out rectification；
Output control sub-circuit provides the first power supply under the control of control node and output control terminal, to signal end is read
The signal at end.
Optionally, the method further includes：
First reset subcircuit is under the control of the first reset terminal, to the signal for reading signal end offer third power end；
Second reset subcircuit provides the signal at second source end to control node under the control of the second reset terminal.
A kind of fingerprint recognition circuit of offer of the embodiment of the present invention and its driving method, display device, wherein the circuit packet
It includes：At least one ultrasonic transducer, output control sub-circuit and commutation sub-circuit；Output control sub-circuit, respectively with control
Node, the first power end, output control terminal are connected with signal end is read, for the control in control node and output control terminal
Under, to the signal for reading signal end the first power end of offer；Commutation sub-circuit connects with control node and second source end respectively
It connects, the electric signal for receiving control node carries out rectification；Ultrasonic transducer is connect with control node, is used for control
Node processed provides ultrasonic transducer and receives electric signal caused by the ultrasonic wave of reflection, wherein commutation sub-circuit includes：The
The control pole of one switching transistor, first switch transistor is connect with control node or second source end, the first pole and control
Node connection processed, the second pole is connect with second source end.The embodiment of the present invention includes that switch is brilliant by the way that commutation sub-circuit is arranged
Body pipe reduces the quantity for the mask plate that fingerprint recognition circuit is made, and not only simplifies the manufacture craft of fingerprint recognition circuit, also
Cost is saved.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and is obtained in claim and attached drawing.
Description of the drawings
Attached drawing is used for providing further understanding technical solution of the present invention, and a part for constitution instruction, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is the structural schematic diagram one of fingerprint recognition circuit provided in an embodiment of the present invention；
Fig. 2 is the equivalent circuit diagram of commutation sub-circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram two of fingerprint recognition circuit provided in an embodiment of the present invention；
Fig. 4 is the equivalent circuit diagram one of fingerprint recognition circuit provided in an embodiment of the present invention；
Fig. 5 is the equivalent circuit diagram two of fingerprint recognition circuit provided in an embodiment of the present invention；
Fig. 6 is the working timing figure one of fingerprint recognition circuit provided in an embodiment of the present invention；
Fig. 7 is the working timing figure two of fingerprint recognition circuit provided in an embodiment of the present invention；
Fig. 8 is the flow chart of the driving method of fingerprint recognition circuit provided in an embodiment of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature mutually can arbitrarily combine.
Step shown in the flowchart of the accompanying drawings can be in the computer system of such as a group of computer-executable instructions
It executes.Also, although logical order is shown in flow charts, and it in some cases, can be with suitable different from herein
Sequence executes shown or described step.
Unless otherwise defined, the embodiment of the present invention discloses the technical term used or scientific terminology should be institute of the present invention
The ordinary meaning that the personage with general technical ability is understood in category field." first ", " second " used in the embodiment of the present invention
And similar word is not offered as any sequence, quantity or importance, and be used only to distinguish different component parts.
The similar word such as " comprising " or "comprising", which means to appear in element or flase drop before the word, to be covered and appears in behind the word
The element enumerated either object and its equivalent and be not excluded for other elements or object." connection " or " connected " etc. are similar
Word is not limited to physics or mechanical connection, but may include electrical connection, either directly or between
It connects.
It will be understood by those skilled in the art that the switching transistor used in all embodiments of the application all can be film
Transistor or field-effect tube or the identical device of other characteristics.Preferably, the thin film transistor (TFT) used in the embodiment of the present invention can
To be oxide semi conductor transistor.Since the source electrode of the transistor used here, drain electrode are symmetrical, so its source electrode, leakage
Pole can be interchanged.In embodiments of the present invention, to distinguish the two poles of the earth in addition to grid of transistor, one of electrode is known as the
One pole, another electrode are known as the second pole, and first extremely can be source electrode or drain electrode, and second extremely can be drain electrode or source electrode, in addition,
The grid of transistor is become into control pole.
Embodiment one
Fig. 1 is the structural schematic diagram one of fingerprint recognition circuit provided in an embodiment of the present invention, and Fig. 2 carries for the embodiment of the present invention
The equivalent schematic of the commutation sub-circuit of confession, as illustrated in fig. 1 and 2, fingerprint recognition circuit provided in an embodiment of the present invention, including：
At least one ultrasonic transducer, output control sub-circuit and commutation sub-circuit.
Specifically, output control sub-circuit, respectively with control node N, the first power end V1, output control terminal SOUT and reading
Signal end READ connections are taken, under the control of control node N and output control terminal SOUT, being provided to signal end READ is read
The signal of first power end V1；Commutation sub-circuit is connect with control node N and second source end V2 respectively, for that will control section
The electric signal that point N is received carries out rectification；Ultrasonic transducer is connect with control node N, super for being provided to control node N
Acoustic wave transducer receives electric signal caused by the ultrasonic wave of reflection.
Wherein, commutation sub-circuit includes：The control pole of first switch transistor T1, first switch transistor T1 are saved with control
Point N or the V2 connections of second source end, the first pole are connect with control node N, and the second pole is connect with second source end V2.It needs
It is noted that Fig. 2 is illustrated by taking the control pole of first switch transistor T1 and control node N as an example.
In the present embodiment, ultrasonic transducer generates the telecommunications of sine and cosine waveform according to the ultrasonic wave for receiving reflection
Number, and it is supplied to control node, commutation sub-circuit carries out rectification to the electric signal of control node, generates direct current signal, different
Influence of the direct current signal to output control sub-circuit is different, to reading the signal of the first power end that signal end provides also not phase
Together.
Optionally, fingerprint recognition circuit provided in an embodiment of the present invention is used for fingerprint recognition.
It should be noted that the signal for reading signal end is analog signal, in order to realize fingerprint recognition, simulation output is needed
It is converted into digital signal to analog-digital converter (Analog-to-Digital Converter, abbreviation ADC), and is sent to
Control module generates fingerprint image by control signal according to the digital signal received.
Optionally, control module can be microcontroller, field programmable gate array (Field-Programmable Gate
Array, abbreviation FPGA) etc..
It should be noted that needing to form the mask of the mask plate of active layer, gate electrode in existing fingerprint recognition circuit
The mask of plate, the mask plate for adulterating P, the doping mask plate of N, the mask plate of gate insulation layer, the mask plate of source-drain electrode, flatness layer
Plate and anode mask plate, totally 8 mask plates, and then only needed to form in fingerprint recognition circuit provided in an embodiment of the present invention
The mask plate of active layer, the mask plate of gate electrode, doping the mask plate of P, the mask plate of gate insulation layer, source-drain electrode mask plate,
The mask plate and anode mask plate of flatness layer or the mask for forming the mask plate of active layer, the mask plate of gate electrode, doping N
Plate, the mask plate of gate insulation layer, the mask plate of source-drain electrode, the mask plate of flatness layer and anode mask plate, totally 7 masks
Plate.Therefore, in the present embodiment, commutation sub-circuit includes：Switching transistor, compared with prior art, using diode as whole
Sub-circuit is flowed, the quantity of mask plate is not only reduced, also reduces doping process.
Fingerprint recognition circuit provided in an embodiment of the present invention includes：At least one ultrasonic transducer, output control son electricity
Road and commutation sub-circuit；Output control sub-circuit, respectively with control node, the first power end, output control terminal and read signal
End connection, under the control of control node and output control terminal, the signal of the first power end to be provided to reading signal end；It is whole
Sub-circuit is flowed, is connect respectively with control node and second source end, the electric signal for receiving control node carries out rectification；
Ultrasonic transducer is connect with control node, for providing the ultrasonic wave that ultrasonic transducer receives reflection to control node
Generated electric signal, wherein commutation sub-circuit includes：First switch transistor, the control pole of first switch transistor and control
Node or second source processed end connects, and the first pole is connect with control node, and the second pole is connect with second source end.This hair
Bright embodiment includes switching transistor by the way that commutation sub-circuit is arranged, and reduces the number for the mask plate that fingerprint recognition circuit is made
Amount, not only simplifies the manufacture craft of fingerprint recognition circuit, also as save cost.
Optionally, Fig. 3 is the structural schematic diagram two of fingerprint recognition circuit provided in an embodiment of the present invention, as shown in figure 3, this
Inventive embodiments provide fingerprint recognition circuit further include：First reset subcircuit and the second reset subcircuit.
Specifically, the first reset subcircuit, respectively with third power end V3, the first reset terminal RESET1 and read signal end
READ connections, under the control of the first reset terminal RESET1, the letter of third power end V3 to be provided to reading signal end READ
Number；Second reset subcircuit is connect with second source end V2, the second reset terminal RESET2 and control node N respectively, for the
Under the control of two reset terminal RESET2, the signal of second source end V2 is provided to control node N.
In the present embodiment, the first reset subcircuit is used to reset the signal for reading signal end READ, can not only
The data identified before are avoided to interfere, additionally it is possible to avoid interfering to identifying later.
In the present embodiment, the second reset subcircuit can avoid this knowledge for being resetted to the signal of control node N
The other data to identification next time are interfered.
Optionally, Fig. 4 is the equivalent circuit diagram one of fingerprint recognition circuit provided in an embodiment of the present invention, as shown in figure 4, defeated
Go out to control sub-circuit and includes：Second switch transistor T2 and driving transistor DTFT；First reset subcircuit includes：Third switchs
Transistor T3；Second reset subcircuit includes：4th switching transistor T4.
Specifically, the control pole of second switch transistor T2 is connect with output control terminal SOUT, the first pole is brilliant with driving
The first pole of body pipe DTFT connects, and the second pole is connect with signal end READ is read；The control pole of driving transistor DTFT and control
Node N connections processed, the second pole are connect with the first power end V1；The control pole of third switching transistor T3 and the first reset terminal
RESET1 connections, the first pole are connect with third power end V3, and the second pole is connect with signal end READ is read；4th switch is brilliant
The control pole of body pipe T4 is connect with the second reset terminal RESET2, and the first pole is connect with second source end V2, the second pole and control
Node N connections processed.
It should be noted that Fig. 4 is with first switch transistor T1, second switch transistor T2, third switching transistor
T3 and the 4th switching transistor T4 is to illustrate for P-type TFT, wherein the control of first switch transistor T1
Pole processed is connect with control node N.
Optionally, Fig. 5 is the equivalent circuit diagram two of fingerprint recognition circuit provided in an embodiment of the present invention, and Fig. 5 is with first
Switching transistor T1, second switch transistor T2, third switching transistor T3 and the 4th switching transistor T4 are that N-type film is brilliant
It is illustrated for body pipe, wherein the control pole of first switch transistor T1 is connect with second source end V2.
In the present embodiment, switching transistor T1~T4 all can be N-type TFT or P-type TFT, can
With unified technological process, manufacturing process can be reduced, the yield of product is helped to improve.In addition, it is contemplated that low temperature polycrystalline silicon is thin
The leakage current of film transistor is smaller, and therefore, preferably all transistors of the embodiment of the present invention are low-temperature polysilicon film transistor, thin
Film transistor can specifically select the thin film transistor (TFT) of bottom grating structure or the thin film transistor (TFT) of top gate structure, as long as can realize
Switching function.
Specifically, as shown in Figures 4 and 5, ultrasonic transducer provided in an embodiment of the present invention includes：First electrode 11,
Two electrodes 12 and the piezoelectric layer 13 being arranged between first electrode 11 and second electrode 12.
Specifically, control node N is connect with first electrode 11 or second electrode 12.If control node N and first electrode 11
Connection, then second electrode 12 is connect with bias voltage signal end BIAS, if control node N is connect with second electrode 12, first electrode
11 connect with bias voltage signal end BIAS.
Optionally, piezoelectric layer 13 is made out of a piezoelectric material, including：Polyvinylidene fluoride or polytetrafluoroethylene (PTFE) etc., the present invention
Embodiment is not limited in any way this.
The technical solution of embodiment is further illustrated the present invention below by the course of work of fingerprint recognition circuit.
It is N-type TFT with switching transistor T1~T4 in fingerprint recognition circuit provided in an embodiment of the present invention
For, Fig. 6 is the working timing figure one of fingerprint recognition circuit provided in an embodiment of the present invention；As it can be seen in figures 5 and 6, the present invention is real
Applying the fingerprint recognition circuit involved in example includes：4 switching transistors (T1~T4), 1 driving transistor (DTFT), 3 letters
Number input terminal (RESET1, RESET2 and SOUT), 3 power ends (V1, V2 and V3) and 1 output end (READ).
It should be noted that the first power end V1, second source end V2 and third power end V3 persistently provide direct current signal,
Wherein, second source end V2 and third power end V3 persistently provides high level signal, such as 5V, the signal tool of the first power end V1
Body is determined according to the signal of control node N.
Specifically：
The input signal of first stage t1, i.e. initial phase, the first reset terminal RESET1 are high level, and third switch is brilliant
Body pipe T3 is opened, and to the signal for reading signal end READ offer third power ends V3, the letter of signal end READ is read with initialization
Number, the input signal of second source end V2 is high level, and first switch transistor T1 is opened.
In this stage, the input signal of the first reset terminal RESET1 in input terminal is high level, the second reset terminal
The input signal of RESET2 and output control terminal SOUT are low level, in addition, in order to avoid reading fingerprint recognition circuit transmitting
Ultrasonic wave, the signal of bias voltage signal end BIAS is lifted to high level such as 15V.
Second stage t2 exports the stage, fingerprint recognition circuit receives the ultrasonic wave of reflection, due to first switch crystal
Pipe T1 is opened, then the electric signal received control node N carries out rectification processing, generates direct current signal, passes through the first electricity of control
The input signal of source V1 so that the voltage difference of the signal of the signal of control node N and the first power end V1 is more than driving crystal
The threshold voltage of pipe DTFT, at this point, driving transistor DTFT is opened, the signal of different control node N opens driving transistor
The degree of DTFT is different, in addition, the input signal of output control terminal SOUT is high level, second switch transistor T2 is opened, to
It reads signal end READ and signal is provided, the opening degree of driving transistor DTFT is different, to read that signal end READ provides the
The signal of one power end V1 also differs.
In this stage, the input signal of the output control terminal SOUT in input terminal is high level, the first reset terminal RESET1
Input signal with the second reset terminal RESET2 is low level.
The input signal of phase III t3, output control terminal SOUT are low level, and second switch transistor T2 is closed, and is read
Signal end READ is not exported, and the input signal of the first reset terminal RESET1 is high level, and third switching transistor T3 is opened, to
The signal that signal end READ provides third power end V3 is read, the signal to avoid this reading signal end READ identifies next time
Interference.
In this stage, the input signal of the first reset terminal RESET1 in input terminal is high level, output control terminal SOUT
Input signal with the second reset terminal RESET2 is low level.
Fourth stage t4, the i.e. input signal of the second reset terminal RESET2 are high level, and the 4th switching transistor T4 is opened,
The current potential of control node N is pulled to the signal of second source end V2, to be resetted to control node N.
In this stage, the input signal of the second reset terminal RESET2 in input terminal is high level, the first reset terminal
The input signal of RESET1 and output control terminal SOUR are low level.
It should be noted that after the completion of fourth stage, it is carried out at the same time next line reading.
Further, Fig. 7 is the working timing figure two of fingerprint recognition circuit provided in an embodiment of the present invention, and Fig. 7 is to refer to
Switching transistor T1~T4 in line identification circuit is to illustrate for P-type TFT, and Fig. 7 is that Fig. 4 is corresponding
Work schedule, in conjunction with Fig. 4 and Fig. 7, the operation principle operation principle corresponding with Fig. 5 of fingerprint recognition circuit is similar, herein no longer
It repeats, the difference is that, the control pole of first switch transistor T1 is connect with control node N, and third power end V3 is persistently carried
For low level signal, the first reset terminal RESET1 is in the first stage low level with the input signal of phase III, and second resets
End RESET is level in the input signal of fourth stage, and output control terminal SOUT is low level in the input signal of second stage.
Embodiment two
Inventive concept based on above-described embodiment, Fig. 8 are the driving side of fingerprint recognition circuit provided in an embodiment of the present invention
The flow chart of method, as shown in figure 8, a kind of driving method of fingerprint recognition circuit provided in an embodiment of the present invention, Application Example
In one fingerprint recognition circuit provided, following steps are specifically included：
The ultrasonic wave that step 100, ultrasonic transducer receive reflection to control node offer ultrasonic transducer is produced
Raw electric signal.
The electric signal that step 200, commutation sub-circuit receive control node carries out rectification.
Wherein, electric signal is that ultrasonic transducer receives caused by the ultrasonic wave of reflection.
Step 300, output control sub-circuit provide under the control of control node and output control terminal to signal end is read
The signal of first power end.
It should be noted that the signal of different control nodes, to the signal for reading the first power end that signal end provides
Also it differs.
The driving method of fingerprint recognition circuit provided in an embodiment of the present invention applies the fingerprint recognition provided in embodiment one
In circuit, realization principle is similar with effect is realized, details are not described herein.
Optionally, in order to ensure not interfered by fingerprint recognition before, and the fingerprint recognition of next time is not interfered,
Before step 100 and after step 200, ultrasonic wave driving method provided in an embodiment of the present invention further includes：First is multiple
Seat circuit is under the control of the first reset terminal, to the signal for reading signal end offer third power end.
Specifically, the first reset subcircuit is used to reset the signal for reading signal end.
Optionally, in order to ensure not interfere the fingerprint recognition of next time, after step 200, the embodiment of the present invention
The ultrasonic wave driving method of offer further includes：Second reset subcircuit provides under the control of the second reset terminal to control node
The signal at second source end.
Specifically, the second reset subcircuit is for resetting the signal of control node.
Embodiment three
Inventive concept based on above-described embodiment, the embodiment of the present invention also provide a kind of display device and include：Fingerprint recognition
Circuit.
Wherein, fingerprint recognition circuit is used for fingerprint recognition or personal recognition, and the embodiment of the present invention does not make its function any
It limits.Fingerprint recognition circuit is the fingerprint recognition circuit that embodiment one provides, and realization principle is similar with effect is realized, herein not
It repeats again.
Preferably, which can be：Oled panel, mobile phone, tablet computer, television set, display, notebook electricity
Any product or component with display function such as brain, Digital Frame, navigator.
Attached drawing of the embodiment of the present invention pertain only to the present embodiments relate to structure, other structures, which can refer to, usually to be set
Meter.
In the absence of conflict, the feature in the embodiment of the present invention, that is, embodiment can be combined with each other new to obtain
Embodiment.
Although disclosed herein embodiment it is as above, the content only for ease of understanding the present invention and use
Embodiment is not limited to the present invention.Technical staff in any fields of the present invention is taken off not departing from the present invention
Under the premise of the spirit and scope of dew, any modification and variation, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (9)
1. a kind of fingerprint recognition circuit, which is characterized in that including：At least one ultrasonic transducer, output control sub-circuit and
Commutation sub-circuit；
The output controls sub-circuit, is connect respectively with control node, the first power end, output control terminal and reading signal end,
For under the control of control node and output control terminal, the signal of the first power end to be provided to reading signal end；
The commutation sub-circuit is connect with control node and second source end respectively, the telecommunications for receiving control node
Number carry out rectification；
The ultrasonic transducer, connect with control node, is received for providing the ultrasonic transducer to control node
Electric signal caused by the ultrasonic wave of reflection；
Wherein, the commutation sub-circuit includes：First switch transistor, control pole and the control of the first switch transistor save
Point or the connection of second source end, the first pole are connect with control node, and the second pole is connect with second source end.
2. fingerprint recognition circuit according to claim 1, which is characterized in that further include：First reset subcircuit and second
Reset subcircuit；
First reset subcircuit is connect respectively with third power end, the first reset terminal and reading signal end, for first
Under the control of reset terminal, to the signal for reading signal end offer third power end；
Second reset subcircuit is connect with second source end, the second reset terminal and control node respectively, for multiple second
Under the control at position end, the signal at second source end is provided to control node.
3. fingerprint recognition circuit according to claim 2, which is characterized in that the output controls sub-circuit and includes：Second
Switching transistor and driving transistor；
The control pole of the second switch transistor is connect with output control terminal, and the first pole of the first pole and driving transistor connects
It connects, the second pole is connect with signal end is read；
The control pole of the driving transistor is connect with control node, and the second pole is connect with the first power end；
First reset subcircuit includes：Third switching transistor；
The control pole of the third switching transistor is connect with the first reset terminal, and the first pole is connect with third power end, the
Two poles are connect with signal end is read；
Second reset subcircuit includes：4th switching transistor；
The control pole of 4th switching transistor is connect with the second reset terminal, and the first pole is connect with second source end, the
Two poles are connect with control node.
4. fingerprint recognition circuit according to claim 3, which is characterized in that first switch transistor, second switch crystal
Pipe, third switching transistor and the 4th switching transistor are P-type TFT；
Wherein, the control pole of the first switch transistor is connect with control node.
5. fingerprint recognition circuit according to claim 3, which is characterized in that first switch transistor, second switch crystal
Pipe, third switching transistor and the 4th switching transistor are N-type TFT；
Wherein, the control pole of the first switch transistor is connect with second source end.
6. fingerprint recognition circuit according to claim 1, which is characterized in that the ultrasonic transducer includes：First electricity
Pole, second electrode and the piezoelectric layer being arranged between the first electrode and the second electrode；
Wherein, the control node is connect with the first electrode or the second electrode.
7. a kind of display device, which is characterized in that including such as claim 1~6 any one of them fingerprint recognition circuit.
8. a kind of driving method of fingerprint recognition circuit, which is characterized in that apply in any fingerprint of claim 1~6
In identification circuit, including：
Ultrasonic transducer provides the ultrasonic transducer to control node and receives telecommunications caused by the ultrasonic wave of reflection
Number；
The electric signal that commutation sub-circuit receives control node carries out rectification；
Output control sub-circuit provides the first power end under the control of control node and output control terminal, to signal end is read
Signal.
9. according to the method described in claim 8, it is characterized in that, the method further includes：
First reset subcircuit is under the control of the first reset terminal, to the signal for reading signal end offer third power end；
Second reset subcircuit provides the signal at second source end to control node under the control of the second reset terminal.
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