CN206224507U - Finger print detection device - Google Patents
Finger print detection device Download PDFInfo
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- CN206224507U CN206224507U CN201590000422.7U CN201590000422U CN206224507U CN 206224507 U CN206224507 U CN 206224507U CN 201590000422 U CN201590000422 U CN 201590000422U CN 206224507 U CN206224507 U CN 206224507U
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- 238000001514 detection method Methods 0.000 title claims abstract description 101
- 230000004044 response Effects 0.000 claims abstract description 9
- 230000000052 comparative effect Effects 0.000 claims description 11
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- 238000012545 processing Methods 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 description 57
- 239000000203 mixture Substances 0.000 description 14
- 230000006870 function Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 10
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- 238000012544 monitoring process Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
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- 230000003321 amplification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
Abstract
According to an embodiment, there is provided a kind of following finger print detection device, including：Outer electrode, applies drive signal；Sensor array, the multiple sensor mats comprising the response signal produced for exporting the applying based on the drive signal, and be adjacently positioned with the outer electrode；Drive signal supply department, comprising buffer, the buffer corresponds to be input into signal and exports the drive signal according to default gain；And compensation section, the decay of the drive signal is compensated for the size based on the drive signal exported from the drive signal supply department.
Description
Technical field
The utility model is related to finger print detection device, in particular to following finger print detection device：Measure in real time
The size of drive signal, and whole system is controlled according to the size of measurement, so as to compensate drive signal relaxation phenomenon.
Background technology
The lines of fingerprint varies with each individual, therefore is widely used in personal identification field.Especially, fingerprint is used as personal authentication
Means and the widely used field various in finance, crime survey, safety etc..
Fingerprint sensor is developed in order to be recognized by recognizing this fingerprint personal.Fingerprint sensor is to make the hand of people
Abutment and recognize finger fingerprint device, its be used as being capable of deciding whether be proper user means.
As the mode for realizing fingerprint Identification sensor, it is known to optical mode, thermal sensing mode and capacitive way etc.
Various RM.Wherein, the fingerprint Identification sensor of capacitive way is sensed to electric conductivity in the finger-surface contacts of people and schemed
The apperance (fingerprint pattern) of fingerprint is obtained during case by the capacitance variations of the shape of valley and a ridge line of the detection based on fingerprint.
Recently, the communication function of such as phone, short message service etc can be not only provided by mancarried device,
The various additional function using personal information such as finance, safety is also provided, and, for the locking device of mancarried device
Necessity seems even more important.In order to improve the locking effect of this mancarried device, Devoting Major Efforts To Developing and is provided with by fingerprint
The terminal of the locking device of sensor.
When fingerprint is detected, apply drive signal and using its response signal come perform detection, now, only by the use of as
The finger of detection object applies drive signal, and each detecting pad could detect accurate response signal.However, referring in actually identification
During line, user will catch terminal using a hand, and detect the fingerprint of another hand.Now, drive signal will be from conduct
The finger of detection object is flowed out and is disperseed by the metal shell part with the terminal for catching the hand of terminal to contact.That is, drive
Signal is assigned to by voltage decays as other circuits composition of finger and metal shell connection of detection object etc..
With the decay of drive signal, the sensor mat of the response caused according to the supply of drive signal from output
The size of output signal is likely to decay and export, accordingly, it will fingerprint detection is adversely affected.
Utility model content
Technical problem
The purpose of this utility model is to solve above-mentioned problem of the prior art.
Additionally, the purpose of this utility model is, when fingerprint is detected, to being applied to the drive signal of finger with hand
Refer to and metal shell between voltage distribution and reduce degree be monitored, and compensate accordingly drive signal size or
The size of the output signal from sensor mat output is compensated, so as to realize normal fingerprint detection.
Technological means
According to the embodiment of the present utility model for reaching purpose as described above, there is provided a kind of following fingerprint inspection
Device is surveyed, including：To finger outer electrode, apply drive signal；Sensor array, comprising for exporting based on the driving letter
Number applying and multiple sensor mats of response signal for producing, and be adjacently positioned with the outer electrode；Drive signal is supplied
Portion, comprising buffer, the buffer corresponds to be input into signal and exports the drive signal according to default gain；And
Compensation section, compensates for the size based on the drive signal for being applied to the finger exported from the drive signal supply department
The decay of the drive signal caused by due to being distributed to the voltage of the finger and metal shell.
The buffer can export the drive signal between supply voltage and ground potential, and the compensation section can be by
The size of the drive signal is compared with least one a reference value, and is determined according to comparative result described slow for adjusting
The buffer supply voltage controlling value of the supply voltage of storage.
With more than one a reference value can be compared the size of the drive signal by the compensation section, and based on than
Relatively result determines the buffer gain control value of the gain for adjusting the buffer.
The compensation section can compare the size of the drive signal with least one a reference value, and based on comparative result
To determine the detection voltage controlling value for compensating the detection voltage from sensor mat output.
The finger print detection device can also include：Detection circuit, is connected with sensor mat each described；Signal transacting
Portion, is processed the output signal from the detection circuit, and the compensation section can be by the detection of determination electricity
Pressure controlling value uses detection circuit or the signal processing part.
The detection voltage controlling value can use programmable gain amplifier (PGA) in the signal processing part or
Person's analog-digital converter (ADC).
The size of the drive signal can be contrasted and be performed shown benefit by the compensation section with default ideal value
Repay.
In addition, according to another embodiment of the present utility model, there is provided a kind of operating method of finger print detection device, the finger
The response signal from finger that line detection means includes multiple sensor mats, applying of the output based on drive signal and produces,
Including the steps：Enabling signal and predetermined input signal are supplied to buffer, so that the buffer is according to pre-
If gain carry out output drive signal；Measure the size of the drive signal for being applied to the finger from buffer output；
And determined according to the measurement result for compensating because the voltage between the finger and metal shell distributes what is caused
The controlling value of the decay of the drive signal.
Technique effect
According to an embodiment of the present utility model, due to that can be carried out to the virtual voltage for being applied to the drive signal of finger
Monitoring, therefore can in real time monitor the attenuation degree produced according to the voltage distribution between metal shell and finger.And,
The control of size for drive signal or the size for output signal from sensor mat can be realized accordingly
Control, therefore can effectively compensate for being influenceed caused by the decay according to drive signal.As a result, have to receive by driving
The decay influence for causing of dynamic signal and the effect that generates normal fingerprint image.
Effect of the present utility model is not limited to above-mentioned effect, it will be appreciated that, it is of the present utility model specifically
The all of effect that bright or from right is recorded in composition of the present utility model is released is included in this practicality
It is new.
Brief description of the drawings
Fig. 1 is the figure of the schematical composition for showing the electronic equipment according to an embodiment of the present utility model.
Fig. 2 is the figure of the composition for schematically showing the finger print detection device according to an embodiment of the present utility model.
Fig. 3 is the figure of the composition for showing the finger print detection device according to an embodiment of the present utility model.
Fig. 4 is the oscillogram of the drive signal according to an embodiment of the present utility model.
Fig. 5 is the figure of the composition of the comparing section for showing the finger print detection device according to an embodiment of the present utility model.
Fig. 6 is the figure of the operation of the comparing section for showing the finger print detection device according to an embodiment of the present utility model.
Fig. 7 is the figure of the composition for showing the finger print detection device according to another embodiment of the present utility model.
Fig. 8 is the oscillogram of the result for illustrating to control drive signal according to another embodiment of the present utility model.
Fig. 9 is for illustrating the drive signal attenuation compensation in the finger print detection device according to embodiment of the present utility model
The flow chart of method.
Specific embodiment
Below, it will the utility model is illustrated referring to the drawings.However, the utility model can be implemented as it is various
Mutually different form, therefore the utility model is not limited to embodiment described herein.And, in order to this
Utility model is subject to explicitly stated, eliminates the part unrelated with explanation in accompanying drawing, and through entire disclosure, to similar
Part used similar reference numeral.
Throughout the specification, when certain part is mentioned with another part " connection ", it is except the feelings of " being directly connected to "
Beyond shape, the situation of miscellaneous part and " being indirectly connected with " is also folded with including centre.In addition, work as being recited as certain a part of "comprising"
During a certain inscape, in the case of without special opposite record, its implication does not simultaneously lie in exclusion other inscapes,
But be to retain the possibility for possessing other constituent elements.
Hereinafter, embodiment of the present utility model is described in detail referring to the drawings.
Fig. 1 is the figure of the schematical composition for showing the electronic equipment according to an embodiment of the present utility model.
Reference picture 1, electronic equipment can possess at least a portion and have finger print detection device 100.In the accompanying drawings, it is illustrated that be
Finger print detection device 100 is formed at the marginal position of the side of electronic equipment, but is formed at any position all without departing from this
The scope of utility model.
Electronic equipment according to an embodiment of the present utility model can be performed predetermined data processing and perform user
The data equipment of desired operation.Electronic equipment can possess input unit and display part 300, and can be by display part
300 will be supplied to user for the state of the operation realized by the predetermined operational instructions that input unit is input into according to user.This
Outward, electronic equipment can include outer cover glass 500, for protection display part 300, and be formed before electronic equipment.
In fig. 1 it is illustrated that for the display part 300 of electronic equipment is realized with touch-sensitive display, and itself play simultaneously defeated
Enter the function in portion, but, input unit can for example be realized in the way of keyboard or keypad, so as to be relatively independent of display part
300 and possess.
Electronic equipment according to an embodiment of the present utility model is it should be understood that to be configured with memory cell and carrying
Microprocessor and possess operational capability, including such as tablet personal computer (PC), smart mobile phone, personal computer, work
Stand, personal digital assistant (PDA), networking flat board, mobile phone, navigation etc digital device in interior term.
If finger print detection device 100 according to an embodiment of the present utility model can be by touching on sensor if finger
Region (area) mode of fingerprint etc. is read to realize.But according to the finger print detection device 100 of embodiment of the present utility model
It is not limited thereto, can also be realized by sliding-type.Sliding-type finger print detection device 100 recognizes fingerprint as follows：Inspection
The fingerprint of the finger that survey is moved in sliding manner, so that the fingerprint image of pieces is read, then by these fragment fingerprint images
As being integrated into an image and realizing complete fingerprint image.
Finger print detection device 100 includes the sensor array 110, outer electrode being made up of multiple fingerprint sensor elements
130.Outer electrode 130 is relatively independent of sensor array 110 and is equipped with.Outer electrode 130 is performed for sensing fingerprint
Drive signal is sent to the function of measured body (finger).
In fig. 1 it is shown that outer electrode 130 is surrounding annular (ring) morphogenetic reality of sensor array 110
Example is applied, but outer electrode 130 can also be formed in the way of only surrounding a part for sensor array 110.In addition it is also possible to
Isolated with sensor array 110 with the form of framework and formed, can also be being arranged in the upper surface phase with sensor array 110
Same plane or the mode of parallel plane are formed as predetermined shape (for example, "U" shaped shape of upset).According to this practicality
The outer electrode 130 of new embodiment is not limited to specific form.
Outer electrode 130 needs to send drive signal to measured body, therefore is formed by conducting metal, and fingerprint detection
Device 100 is equipped on electronic equipment together with outer electrode with the form of module.
When fingerprint is detected, it will the response signal from finger of applying of the detection based on drive signal, but drive
Signal only is applied just make each detecting pad export accurate detection signal as the finger of detection object.But, in reality
During the identification fingerprint of border, user is needed to catch terminal using a hand, and fingerprint, therefore drive signal are recognized using another hand
Will flow out and divide from as the finger of identification object by the mental package part of the terminal for catching the hand of terminal to be contacted
Dissipate.That is, there is drive signal and the asking for decaying as the finger of detection object, the metal shell of terminal is assigned to by voltage
Topic.
As a kind of method compensated to it, there is following technology：In the sensor array of finger print detection device 100
Sensor mat region arrangement monitoring pad in row, and sensor mat is compensated by the size of the output signal from monitoring pad
Output voltage.
Specifically, measurement from the inside for being isolator arranged in sensor mat, or with sensor mat formed insulation and
The size of the output signal of the monitoring pad isolator arranged, and controlling value is determined according to the value of measurement, so as to use it for mending
Repay the output voltage from sensor mat.
In addition, in the utility model, the drive signal supplied outer electrode 130 and a reference value are compared, from
And enter to be about to the operation of its compensation in the case of being below predetermined value in comparative result.If outer electrode 130 is realized by multiple,
The drive signal for being then supplied at least one outer electrode 130 is compared with a reference value.Hereinafter, will be described.
Fig. 2 is the figure of the composition for schematically showing the finger print detection device according to an embodiment of the present utility model.
Reference picture 2, finger print detection device 100 include possess in chip exterior (external) outer electrode 130 and
The sensor array 110 being made up of multiple sensor mats.Each sensor mat is connected with detection circuit, and is touched in finger
Testing result value of the output based on finger surface in the case of finger print detection device 100.In this regard, hereinafter carrying out specifically
It is bright.
Possessing in the chip internal (internal) of finger print detection device 100 has drive signal supply department 210 and compensation
Portion 220, wherein, compensation section 220 measures the size of the drive signal Vdrv from the output of drive signal supply department 210, and according to survey
The value of amount and determine to need the controlling value of the gain for using circuit.Compensation section 220 performs the size based on drive signal Vdrv
To compensate the function of its decay.Compensation section 220 can be included in the control logic (control of chip according to an embodiment
Logic), but scope of the present utility model is not limited thereto.Additionally, can further comprising for right in the inside of chip
Detection circuit processed from the signal of the output of sensor array 110 etc., in this regard, hereinafter will be said in more detail
It is bright.
As described above, sensing will be input to by measured body by the drive signal Vdrv that outer electrode 130 applies
Device pad, this drive signal Vdrv can be supplied by drive signal supply department 210.
This drive signal supply department 210 can include more than one power supply supply buffer 211.Buffer 211
Enabling signal (enable signal) ENB can be received and pass through the first terminal A output drive signal Vdrv, and believe driving
Number do not influenceed by circuit or environment etc..
Buffer 211 between the supply voltage VDD and ground potential supplied from mobile device, corresponding to input signal
VdrvIN and according to default gain come output drive signal Vdrv.
Compensation section 220 is included：Comparing section 221, the size of the drive signal Vdrv that will be exported from the first terminal A with one with
On a reference value be compared；Controlling value determining section 222, is determined for electricity based on the output valve exported from comparing section 221
The controlling value of at least a portion gain on road.Drive signal Vdrv from the first terminal A is input to ratio by Second terminal B
Compared with portion 221, and output signal from controlling value determining section 222 is exported by third terminal C, and as being directed to circuit one
Partial gain control value and use.
The Second terminal B of the first terminal A and comparing section 221 connection being connected with buffer 211 is each other by intermediate node
TxOUT IN and connect.Intermediate node TxOUT IN are formed at the node of chip exterior, are for considering metal shell and hand
Between finger voltage distribution and measure be applied to finger actual drive signal node.For the comparing section of compensation section 220
221 and the operation of controlling value determining section 222 will hereinafter be described in detail.
Fig. 3 is the figure of the composition for showing the finger print detection device according to an embodiment of the present utility model.
Reference picture 3, finger print detection device includes what is be made up of the multiple fingerprint sensor elements 111 for constituting multiple row and columns
Sensor array 110.Each fingerprint sensor element 111 is comprising sensor mat SP and receives from the sensor mat SP's
The detection circuit SC of output signal.In figure 3, a detection circuit SC, but each fingerprint sensor element 111 be illustrate only
Possesses a detection circuit SC.Detection circuit SC can include the fortune for amplifying the output signal from each detection faces pad SP
Calculate amplifier.
Output signal from multiple detection circuit SC is input to signal processing part 140.
Signal processing part 140 can be included：Wave filter portion 141, sampling and holding (Sample and Hold) portion 142, phase
Close data aligner (Related Data Calibration：RDC) 143, programmable gain amplifier (Programmable
Gain Amplifier：PGA) 144, difference signal generator (Differential Signal Generator：DSG)145、
Analog-digital converter (Analog to Digital Converter：ADC)146.
Wave filter portion 141 performs the function of the noise of output data of the removal from fingerprint sensor element 111.Wave filter
Portion 141 is the part that fingerprint image is obtained for being analyzed to the data exported from multiple fingerprint sensor elements 111, so
And have in the output data of fingerprint sensor element 111 comprising the data component caused by external noise.Therefore, wave filter
Portion 141 is equipped with low pass filter etc. and performs the function of removing these noises.
Sampling and maintaining part 142 perform following function：Data to removing noise by wave filter portion 141 are sampled
And keep, and store the value.The sampling period of sampling and maintaining part 142 can be controlled according to predetermined clock signal.
RDC 143 performs following function：Output data to sampling and maintaining part 142 (that is, is removing the influence of noise
The output data from fingerprint sensor element 111 being sampled with the predetermined cycle afterwards) regulation displacement.
PGA 144 performs the function of amplification detection data at a predetermined ratio.The finger print of people by crestal line (ridge) and
Paddy (valley) is constituted, therefore, it will there are crestal line or paddy and generate different defeated according to being abutted in fingerprint detection element 111
Go out data.That is, abut to the situation of fingerprint detection element 111 in crestal line and paddy abuts to the situation of fingerprint detection element 111
Under, it will the output data of output size different from each other, at this point it is possible to be controlled to as follows：If it is intended to increasing its size
Difference, then can improve the gain of PGA144；Conversely, if it is desired to reduce the difference of its size, then can reduce PGA's 144
Gain.
ADC 146 performs the digitized function of detection data by form is simulated.Be converted to the data input of digital morphological
To input and output portion 150.
The data of input and output portion 150 are input to be exported with the form of the overall data of sensor array 110, and from defeated
The value for entering the output of output section 150 is delivered to follow-up host apparatus (for example, specific in mobile device or mobile device
Intelligent element or specific application etc.), and the generation of fingerprint image is realized by integration.
Sensing circuit SC, signal processing part 140 and input and output portion are configured at chip internal (Internal) area of Fig. 2
Domain.
Drive signal supply department 210 according to an embodiment is included believed by the first terminal A output drivings as described above
The buffer 211 of number Vdrv.Additionally, drive signal supply department 210 can be included to the supply supply voltage of buffer 211 VDD's
Power suppling part 212.
Compensation section 220 according to an embodiment also includes following compensation section 220：It is applied to the drive of outer electrode 130
After the size of dynamic signal Vdrv is compared with a reference value, the gain of a part for circuit is controlled.
Compensation section 220 is included：Comparing section 221, will export and is applied to from the first terminal A being connected with buffer 211 and be outer
The size of the drive signal Vdrv of portion's electrode 130 is compared with more than one a reference value；Controlling value determining section 222, according to
The comparative result of the comparing section 221 and controlling value (that is, the journey of compensation of gain that determines to need the part for using circuit
Degree), and determine for the controlling value using this degree of compensation.
Comparing section 221 can be by may compare the size of drive signal Vdrv and the general simulation of more than one a reference value
Circuit is realized.In one example, comparing section 221 can include following comparator：Reference voltage can be according to voltage divider
Selectively change, and drive signal Vdrv and the reference voltage are compared, in this regard, hereinafter carrying out detailed
Explanation.A reference value can be default ideal value (ideal value), for example, the finger in people is golden in finger print detection device
The output voltage values of the sensor mat measured in the case of touching sensor mat SP before category packaging, but be not limited to
This.
Controlling value determining section 222 is determined for the output from sensor mat SP based on the output valve of comparing section 221
The detection voltage controlling value that signal (that is, detection voltage) is amplified and compensates.For example, controlling value determining section 222 is by from comparing
The output valve of the output of portion 221 matches the detection voltage controlling value corresponding to the output valve and is stored in advance, afterwards every
During once-through operation, the output based on comparing section 221 can be used in order to amplify from the detection voltage of sensor mat SP outputs
The detection voltage controlling value of value.
Used as an embodiment, controlling value determining section 222 can use and sensing fixed detection voltage controlling value
Detection circuit SC (CON 1) of device pad SP connections.Specifically, can be with so as to be included in detection circuit SC and amplify from sensing
The mode that the gain of the operational amplifier of the output signal of device pad SP is controlled is used.
Used as another embodiment, controlling value determining section 222 can also be by fixed detection voltage controlling value reflection to bag
It is contained in the PGA 144 (CON2) of signal processing part 140.PGA144 be selected according to demand by programming mode amplifier or
The inscape of magnifying power.PGA144 performs the function of the output signal of amplification detection circuit SC, therefore, if it is determined that detection
Voltage controling value is adopted PGA 144, then can increase the output letter of the sensor mat SP abutted from the crestal line with finger
Difference between the output signal of number sensor mat SP abutted with from the paddy with finger.
Used as another embodiment, controlling value determining section 222 can be arrived in ADC the reflection of fixed detection voltage controlling value
The gain (CON 3) during data signal is converted in 146.
That is, controlling value determining section 222 can be used at least one of detection circuit SC, PGA 144 and ADC 146
Fixed detection voltage controlling value.
Controlling value determining section 222 can be realized by the program module of the predetermined algorithm of execution or firmware etc..
Hereinafter, the decay and its compensation that are applied to the drive signal of outer electrode 130 are described in detail.
Fig. 4 is the figure of the waveform for showing the drive signal according to an embodiment.The figure for being illustrated in the upper end of Fig. 4 represents reason
The waveform of the drive signal in the case of thinking；The figure for being illustrated in lower end is the figure of the waveform for representing actual drive signal.
Reference picture 4, in ideal conditions, the drive signal Vdrv for being applied to outer electrode 130 can be square wave letter
Number.I.e., it is possible to be that dutycycle (duty ratio) is constant, and the alternately high RST Vdrv_H of output predefined size and low
The signal of signal Vdrv_L.
However, in practical situations both, the size of the maximum of drive signal Vdrv may be according to the operation of buffer 211
Or surrounding environment and the predetermined portions Vloss that decays.If the size decay of drive signal Vdrv, defeated from fingerprint sensor element
The size of the signal for going out can reduce, accordingly, it is possible to bad influence can be caused to the generation of fingerprint image.
Therefore, the size of the drive signal Vdrv of outer electrode 130 is applied to if reality is exported from buffer 211
It is compared with a reference value, then can be contrasted with preferable situation and measure the attenuation degree of current drive signal Vdrv, and
This can be based on and determine the gain for amplifying the output voltage from sensor mat output.Fig. 5 is shown according to this practicality
The figure of of the comparing section of a new embodiment.
As described above, comparing section 211 includes the comparing for being compared drive signal Vdrv and more than one a reference value
Device com.
There is drive signal Vdrv in the first input end input of comparator com, and have one in the input of the second input
Reference voltage above.Comparator com using value corresponding with the comparative result between drive signal Vdrv and reference voltage as
Output valve Vout and export.
Drive signal Vdrv is transfused to after being changed by predetermined resistance Rx.Resistance Rx can have default
Resistance value, or variable resistor.Obviously, resistance Rx may be removed, and can also be that what is generated in circuit design posts
Raw resistance value.In the case where resistance Rx is removed, drive signal Vdrv will be directly inputted to comparator com.
Multiple output nodes of voltage divider VD can be alternately connected with second input of comparator com.Electricity
Pressure distributor VD may be embodied in the multiple resistance connected in a series arrangement between supply voltage VDD and ground potential.
As supply voltage VDD is provided to multiple resistance, such that it is able to be distributed with more than one reference voltage.Make
It is supply voltage VDD, can directly using the supply voltage of the element being installed on inside finger print detection device, can also utilize will
The voltage that the supply voltage is changed by level shift etc..
The more than one reference voltage distributed by multiple resistance is alternately input to second input of comparator com
End.The number of reference voltage can be made to become not according to the output valve of comparator com is divided into several signals of (bit)
Together.When the number of reference voltage is N, the output valve of comparator com can be log2N.For example, when the benchmark of comparator com
When voltage is 4, as the output valve of comparator 210, the signal of " 00 ", " 01 ", " 10 ", " 11 " etc. 2 can be exported.
For example, as shown in fig. 6, detected to the size of drive signal Vdrv is divided into four-stage, then reference voltage
Number (that is, N values) should be 4, now, the output valve of comparator com can be with 2 outputs.If drive signal Vdrv is more than base
Quasi- voltage VT [2], then the place value of the upper in the output valve of 2 is " 1 "；If conversely, drive signal Vdrv is less than benchmark
Voltage VT [2], then the place value of upper is " 0 ".If additionally, the voltage Vdetect from monitoring pad 120 is more than reference voltage
VT [2], and also more than reference voltage V T [3] (VT [3]>VT [2]), then the place value of lowermost position is " 1 ", so that comparator 210
Final output value Vout be " 11 ".Conversely, if greater than reference voltage V T [2] and less than reference voltage V T [3], then comparator
210 final output value Vout is " 10 ".
Assignment interval between reference voltage can be set as pre- between the maximum of drive signal Vdrv and minimum value
Fixed value, but because its object is to measure its pad value Vloss caused by environmental factor indirectly, it is possible to such as
Under type is designed：In particular range, for example, in ideal conditions, closer to the maximum Vdrv_H of drive signal Vdrv
(reference picture 4), then make the layout pitch between reference voltage tight.But be not limited thereto, voltage point can be will be contained in
The value of the resistance of orchestration VD is properly selected and produces desired reference voltage.
In fig. 5 it is shown that only comprising an embodiment of comparator com, it is obvious that can be according to reference voltage
Number is realized by multiple comparator com.
Controlling value determining section 222 (reference picture 3) can be determined based on the output valve Vout of comparing section 221 for compensating biography
The detection voltage controlling value of the output voltage of sensor pad SP.Can be based on being grasped by the output valve Vout of comparing section 221
The size of drive signal Vdrv determines the detection voltage controlling value of the output voltage for compensating sensor mat SP.
Used as an embodiment, controlling value determining section 222 can be prestored by based on comparing section 221 according to an embodiment
Output valve binary signal and the magnitude of voltage that matches or need the detection voltage controlling value for using.Additionally, unlike this
Ground, controlling value determining section 222 can prestore the voltage matched by the binary signal of the output valve based on comparing section 221
Value needs the detection voltage controlling value for using.
Fig. 7 is the figure of the composition and its operation for showing the finger print detection device according to another embodiment of the present utility model.
Reference picture 7, it can be seen that in the finger print detection device of Fig. 3, drive signal supply department 710 and compensation section 720
Composition or its operation become different.
For according to the drive signal supply department 710 of another embodiment of the present utility model, for output drive signal
The gain of the buffer 711 of Vdrv may change.Additionally, to being supplied according to the drive signal of another embodiment of the present utility model
Answer for portion 710, the size for being supplied in this supply voltage VDD will change.
Therefore, the compensation section 720 according to another embodiment of the present utility model is included：Comparing section 721, will be applied to that outer
The drive signal Vdrv of portion's electrode 130 is compared with more than one a reference value；Controlling value determining section 722, according to comparing section
721 comparative result and determine the buffer power supply electricity of size for adjusting the supply voltage VDD to be supplied to buffer 711
Pressure controlling value or the buffer gain control value for adjusting the gain of buffer 711.According to an embodiment, although not in figure
Individually shown in 2, but the output of controlling value determining section 722 can be by the holding wire that is independently connected in chip internal
It is connected to supply voltage controlling value or buffer 711.According to another embodiment, as shown in fig. 7, controlling value determining section 722
Output may be coupled to application processor (the Application Processor of host apparatus：AP), and AP can based on control
The output of value determining section 722 processed and respectively to buffer supply voltage controlling value or the output control signal of buffer 711.
Specifically, comparing section 721 is applied to size (that is, the buffer of the drive signal Vdrv of outer electrode 130
The size of 711 output signal) and more than one a reference value be compared.The detailed composition of comparing section 721 and reference picture 5
The composition of explanation is identical.
The comparative result carried out by comparing section 721 is input to controlling value determining section 722.Controlling value determining section 722 is based on
The output valve of comparing section 721 generates the buffer gain control value of the gain for adjusting buffer 711, and is used
Buffer 711 (CON 4), or generate the buffer supply voltage of the size of supply voltage VDD for adjusting buffer 711
Controlling value, and pass it to power suppling part 712 (CON 5).In fig. 7 it is shown that the gain of buffer 711 is by this
Control and be adjusted to M times of example and be supplied to the supply voltage of buffer 711 to be adjusted to N times from power suppling part 712
Example.Supply voltage regulation circuit in power suppling part 712 can be realized by general voltage conversion circuit.For example, can
Realized with by such as lower component：Charge pump (charge pump) circuit, charge charging to predetermined electric capacity is exported by institute afterwards
State the voltage that the voltage that the electric charge of charging causes is boosted plus input voltage；Or transformer, using between inductor
Mutual inductance and input voltage is boosted.
Used as one, controlling value determining section 722 is based on the output signal from comparing section 721 and generates for determining to cache
The buffer gain control value of the gain of device 711, so as to directly or indirectly use buffer 711 (CON 4).Buffer
711 gain can be adjusted by adjusting the general method such as size of feedback impedance.
Used as another example, controlling value determining section 722 can generate the big of the supply voltage VDD for adjusting buffer 711
Small buffer supply voltage controlling value, and it is supplied to power suppling part 712 (CON 5).Receive this buffer electricity
The power suppling part 712 of source voltage controling value can be supplied to the size increase such as N of the supply voltage VDD of buffer 711
Times.Therefore, power suppling part 712 can be equipped with for increasing N times of amplifying circuit by supply voltage.Here, N and M can be with
It is greater than 0 integer.
Controlling value determining section 722 can be stored according to the output signal from comparing section 712 to realize the operation
The species or its size of the controlling value of generation or transmission.
Fig. 8 is the oscillogram for showing the exaggerated result of drive signal in the embodiment that reference picture 7 is illustrated.
Reference picture 8, drive signal Vdrv can be in ideal conditions the high RST for alternately exporting predefined size
The square-wave signal of Vdrv_H and low signal Vdrv_L.
If the size of drive signal Vdrv has decayed big equivalent to Vloss due to being present in the parasitic component of circuit
It is small, then this phenomenon can be sensed by comparing section 721.That is, the size of the sensing drive signal of comparing section 721 Vdrv is reduction
Size after size equivalent to Vloss, and according to this sensing result, controlling value determining section 722 can be generated to be used for
The buffer gain control value of the gain of buffer 711 is adjusted, and is used buffer 711 (CON 4), or generation is used
In the size of regulating power source voltage VDD buffer supply voltage controlling value and pass to power suppling part 712 (CON 5).
According to this control, the drive signal Vdrv exported by drive signal supply department 710 will rise reservations
Point.
For example, as shown in figure 8, the minimum value Vdrv-Vloss of the high RST of drive signal Vdrv can be made by control
Value with high RST Vdrv_H ideally is identical.
Hereinbefore, the embodiment of the embodiment of Fig. 3 and Fig. 7 is separately illustrated, but two embodiments can be with
Combination with one another.
For example, while basis adjusts the gain of buffer from the output signal of comparing section, use can also be adjusted
In the gain of the detection circuit, PGA or ADC of the output signal for the treatment of sensor mat.Additionally, in the example, can control
The supply voltage of buffer processed come replace adjust buffer gain, and be described above all of gain control can be same
Shi Jinhang.
Further it is evident that, can perform simultaneously in the 1~CON of control method CON 5 illustrated in the embodiment at least
Two kinds.
Fig. 9 is for illustrating the drive signal attenuation compensation in the finger print detection device according to embodiment of the present utility model
The flow chart of method.
Hereinafter, reference picture 3, Fig. 7 and Fig. 9 are illustrated to drive signal attenuation compensation method.
First, extract supplied to outer electrode 130 drive signal Vdrv (S910), the outer electrode 130 with comprising many
The sensor array 110 of individual sensor mat SP is adjacently positioned.
It is compared with more than one a reference value by the drive signal Vdrv that will be extracted and grasps and be currently supplied to
The size (S920) of the drive signal Vdrv of outer electrode 130.It is this compare can pass through described by comparing section 221,721
Drive signal Vdrv and from relatively performing between at least one a reference value of voltage divider VD (reference picture 5) output.
If grasping the size of drive signal Vdrv, control object is determined based on this, and determine the control for needing to use
Value (S930).This determination step is realized by controlling value determining section 222 or 722, and can be stored with by survey
The information of the method that the size of the drive signal Vdrv of amount is compensated respectively.
If determining controlling value by this method, controlling value determining section 222 or 722 is supplied by controlling drive signal
Answer portion 710 and the size of drive signal Vdrv is increased, or make the output from the sensor mat SP for constituting sensor array
Signal is compensated (S940).
For the control of drive signal supply department 710, the caching of output drive signal Vdrv can be made by generation
The adjusted buffer gain control value (S941) of the gain of device 711, or generation buffer supply voltage controlling value so that
The supply voltage VDD of buffer 711 rises, so as to control power suppling part 712 (S942).
In addition, as the method for output signal of the compensation from sensor mat SP, following method can be used：To receiving
The operational amplifier of the detection circuit SC of the output signal from sensor mat SP uses the detection determined by comparative result
Voltage controling value (S943), or to amplify the entirety of sensor array 110 output signal PGA144 use fixed inspection
Survey voltage controling value (S944).Further, it is also possible to the output signal of the entirety of sensor array 110 is converted into data signal
The numeral conversion of ADC 146 uses corresponding detection voltage controlling value (S945).
According to the utility model, can by measurement be applied to outer electrode drive signal size and according to decay journey
Degree amplifies the size of drive signal, or control for the gain from the part in the circuit of the signal of sensor mat output
The size of the signal required for suitably keeping the generation of fingerprint image.
Additionally, according to the utility model, being decayed in itself based on the drive signal by being initially supplied to finger print detection device
Size compensates operation, therefore, it can carry out the attenuation degree based on drive signal and directly control.Accordingly, Ke Yicong
The fingerprint image deterioration for fundamentally solving the problems, such as the following drive signal of response and sensing, i.e., the drive signal is dispersed to and removes
Metal shell beyond finger and be attenuated.
In addition, according to the utility model, driving can be compensated by various mode according to the convenience of circuit design
The decay of signal.
It is as described above that explanation of the present utility model is carried out just for the sake of providing example, in the utility model institute
The personnel with ABC are appreciated that and can not change technological thought of the present utility model or necessity in the technical field of category
Feature and the utility model is easily deformed into other specific forms.It is, therefore, to be understood that the above embodiments are in institute
It is all exemplary to have in aspect, and is not limitation.For example, in this specification with single type illustrate each is constituted want
Element can by dispersion implement, equally, with decentralized explanation inscape can also by combine in the form of implemented.
Scope of the present utility model must be defined by tbe claims, in addition, it is desirable to understand, can containing from claims
The form of all of change or deformation is all contained in model of the present utility model derived from justice, scope and concept equivalent therewith
In enclosing.
Claims (7)
1. a kind of finger print detection device, it is characterised in that including：
Outer electrode, drive signal is applied to finger；
Sensor array, the multiple sensors comprising the response signal produced for exporting the applying based on the drive signal
Pad, and be adjacently positioned with the outer electrode；
Drive signal supply department, comprising buffer, the buffer corresponds to be input into signal and is exported according to default gain
The drive signal；And
Compensation section, for the size based on the drive signal for being applied to the finger exported from the drive signal supply department come
The decay of the drive signal caused by compensating due to being distributed to the voltage of the finger and metal shell.
2. finger print detection device as claimed in claim 1, it is characterised in that
The buffer exports the drive signal between supply voltage and ground potential,
With at least one a reference value be compared the size of the drive signal by the compensation section, and true according to comparative result
The buffer supply voltage controlling value of the fixed supply voltage for being used to adjust the buffer.
3. finger print detection device as claimed in claim 1, it is characterised in that
With more than one a reference value be compared the size of the drive signal by the compensation section, and based on comparative result come
It is determined that the buffer gain control value of the gain for adjusting the buffer.
4. finger print detection device as claimed in claim 1, it is characterised in that
The compensation section compares the size of the drive signal with least one a reference value, and based on comparative result come determine use
The detection voltage controlling value of the detection voltage exported from the sensor mat in compensation.
5. finger print detection device as claimed in claim 4, it is characterised in that
Also include：Detection circuit, is connected with sensor mat each described；Signal processing part, to from the defeated of the detection circuit
Go out signal to be processed,
The detection voltage controlling value of the determination is used detection circuit or the signal processing part by the compensation section.
6. finger print detection device as claimed in claim 5, it is characterised in that
The detection voltage controlling value uses programmable gain amplifier or analog-digital converter in the signal processing part.
7. finger print detection device as claimed in claim 1, it is characterised in that
The size of the drive signal is contrasted and is performed shown compensation by the compensation section with default ideal value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140042792A KR101613123B1 (en) | 2014-04-10 | 2014-04-10 | Fingerprint detecting apparatuse and driving signal attenuation compensation method |
| KR10-2014-0042792 | 2014-04-10 | ||
| PCT/KR2015/003417 WO2015156553A1 (en) | 2014-04-10 | 2015-04-06 | Fingerprint detection device, and method for compensating for attenuation of driving signal thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206224507U true CN206224507U (en) | 2017-06-06 |
Family
ID=54288074
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201590000422.7U Expired - Fee Related CN206224507U (en) | 2014-04-10 | 2015-04-06 | Finger print detection device |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101613123B1 (en) |
| CN (1) | CN206224507U (en) |
| WO (1) | WO2015156553A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110929700A (en) * | 2019-12-27 | 2020-03-27 | 厦门天马微电子有限公司 | Fingerprint identification display panel, driving method thereof and fingerprint identification display device |
| WO2021120632A1 (en) * | 2019-12-17 | 2021-06-24 | 神盾股份有限公司 | Fingerprint sensing apparatus |
| TWI808432B (en) * | 2021-05-10 | 2023-07-11 | 映智科技股份有限公司 | Voltage sensing fingerprint recognition device and fingerprint recognition method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105389544B (en) * | 2015-10-21 | 2018-04-17 | 深圳市汇顶科技股份有限公司 | Output conversion circuit and fingerprint recognition system |
| KR101959892B1 (en) * | 2017-05-25 | 2019-07-04 | 크루셜텍 (주) | Fingerprint authentication method and apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259804B1 (en) * | 1997-05-16 | 2001-07-10 | Authentic, Inc. | Fingerprint sensor with gain control features and associated methods |
| JP2003028607A (en) * | 2001-07-12 | 2003-01-29 | Sony Corp | Capacitance detector and fingerprint collation apparatus using the same |
| KR100447141B1 (en) * | 2002-03-09 | 2004-09-07 | (주)멜파스 | A semiconductor fingerprint sensing device with shielding means |
-
2014
- 2014-04-10 KR KR1020140042792A patent/KR101613123B1/en active IP Right Grant
-
2015
- 2015-04-06 WO PCT/KR2015/003417 patent/WO2015156553A1/en active Application Filing
- 2015-04-06 CN CN201590000422.7U patent/CN206224507U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021120632A1 (en) * | 2019-12-17 | 2021-06-24 | 神盾股份有限公司 | Fingerprint sensing apparatus |
| TWI757806B (en) * | 2019-12-17 | 2022-03-11 | 神盾股份有限公司 | Fingerprint sensing apparatus |
| CN110929700A (en) * | 2019-12-27 | 2020-03-27 | 厦门天马微电子有限公司 | Fingerprint identification display panel, driving method thereof and fingerprint identification display device |
| CN110929700B (en) * | 2019-12-27 | 2022-09-13 | 厦门天马微电子有限公司 | Fingerprint identification display panel, driving method thereof and fingerprint identification display device |
| TWI808432B (en) * | 2021-05-10 | 2023-07-11 | 映智科技股份有限公司 | Voltage sensing fingerprint recognition device and fingerprint recognition method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015156553A1 (en) | 2015-10-15 |
| KR20150117398A (en) | 2015-10-20 |
| KR101613123B1 (en) | 2016-04-18 |
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