CN106980808A - A kind of fingerprint collecting circuit and fingerprint sensor - Google Patents
A kind of fingerprint collecting circuit and fingerprint sensor Download PDFInfo
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- CN106980808A CN106980808A CN201610032752.5A CN201610032752A CN106980808A CN 106980808 A CN106980808 A CN 106980808A CN 201610032752 A CN201610032752 A CN 201610032752A CN 106980808 A CN106980808 A CN 106980808A
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- 239000011148 porous material Substances 0.000 claims abstract description 17
- 238000003860 storage Methods 0.000 claims description 38
- 230000004913 activation Effects 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 210000004243 sweat Anatomy 0.000 description 4
- 230000006870 function Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000392 somatic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/30—Noise filtering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1353—Extracting features related to minutiae or pores
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Collating Specific Patterns (AREA)
Abstract
The present invention is applied to fingerprint recognition field, more particularly to a kind of fingerprint collecting circuit and fingerprint sensor.In an embodiment of the present invention, the fingerprint collecting circuit includes：The minutiae feature of fingerprint and the pel array of fingerprint pore are gathered, the vertical scanning circuit of vertical scanning is carried out to fingerprint, the fixed pattern noise compensation circuit of noise compensation is carried out to the fingerprint image obtained through vertical scanning and the horizontal scanning circuit of horizontal sweep is carried out to fingerprint.In an embodiment of the present invention, the pel array can not only collect the minutiae feature of fingerprint, it will be appreciated also that ground collects fingerprint pore, and the fingerprint collecting circuit carries out vertical pixel scanning, noise compensation and horizontal pixel scanning to fingerprint respectively, the fingerprint pore of human body can be collected more efficient, exactly, i.e. on the basis of the identification of conventional fingerprint minutiae feature, the collection to fingerprint pore and identification are added, the accuracy rate of fingerprint recognition is improved.
Description
Technical field
The invention belongs to fingerprint identification technology field, more particularly to a kind of fingerprint collecting circuit and fingerprint sensor.
Background technology
Fingerprint recognition system is to carry out fingerprint recognition by gathering and recognizing the form and minutiae feature of somatic fingerprint
's.With the expansion of fingerprint recognition system application, people propose higher and higher requirement to the security of system, are based on
Fingerprint form and the fingerprint recognition system of minutiae feature can not increasingly meet the requirement in high safety field.Therefore, draw
Enter new fingerprint characteristic i.e. fingerprint pore and seem more and more important to improve the security of fingerprint recognition system.
And in current fingerprint recognition system, the sensor main for fingerprint image acquisition will have optical finger print sensing
Device, semiconductor fingerprint sensor and ultrasonic fingerprint sensor.The stability of a system of optical fingerprint sensor is good, cost is low, but
The sensor bulk needed is big, the poor image quality of collection, and its resolution ratio only has 500DPI (Dots Per Inch, per inch
Pixel) left and right；Semiconductor fingerprint sensor resolution ratio is in 600DPI or so, easily by electrostatic influence, may be gathered not when serious
To image, or even itself can also be destroyed；The high resolution of ultrasonic fingerprint sensor reaches 1000DPI, the fingerprint image of collection
Quality is high, but expensive, and performance needs further perfect, not wide use.Also, because of the pore mistake of human body
Carefully, these fingerprint collecting sensors can only collect fingerprint form and minutiae feature, be unable to collect needs more high score
The fingerprint pore of resolution, causes traditional fingerprint recognition system that fingerprint form and minutiae feature can only be identified, it is impossible to
The fingerprint pore of human body is identified, therefore false fingerprint or wet fingerprint can not be efficiently identified, causes the accurate of fingerprint recognition
Rate is reduced.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of fingerprint collecting circuit, it is intended to solve traditional fingerprint collecting sensing
Device can only collect fingerprint form and minutiae feature, be unable to gather the fingerprint pore for needing higher resolution, cause to refer to
The problem of accuracy rate of line identification is reduced.
The embodiment of the present invention is achieved in that a kind of fingerprint collecting circuit, and the fingerprint collecting circuit includes:
Gather the minutiae feature of fingerprint and the pel array of fingerprint pore；
The different control signals of outside input are received, and are believed according to the different corresponding driving of control signal output
Number clock pulses device；
It is connected, is vertically swept according to what the clock pulses device was exported with the clock pulses device and the pel array respectively
Drive signal is retouched to carry out vertical pixel scanning to the fingerprint and generate the vertical scanning circuit of vertical scanning fingerprint image；
It is connected with the clock pulses device, the noise compensation drive signal exported according to the clock pulses device hangs down to described
Straight scan fingerprint image carries out the fixed pattern noise compensation circuit of noise compensation；
It is connected and fixed pattern noise compensation circuit connection with the clock pulses device, the pel array respectively,
The horizontal scanning drive signal exported according to the clock pulses device carries out horizontal pixel scanning to the fingerprint and generates level
The horizontal scanning circuit of scan fingerprint image；
It is connected respectively with the output end and the pel array of the fixed pattern noise compensation circuit, by the finger collected
The analog output module that print image is exported.
Further, the control signal of the outside input includes：Vertical converter activation signal, vertical converter clock
Signal, horizontal switches activation signal, horizontal switches clock signal, mode control signal, selection pixel line reset signal, the
One storage control signal and the second storage control signal.
Further, the clock pulses device includes：
It is connected with the vertical scanning circuit, during according to the vertical converter activation signal of outside input and vertical converter
The vertical scanning drive signal of clock signal output one drives the vertical scanning circuit to the fingerprint to the vertical scanning circuit
Carry out the vertical translation register of vertical pixel scanning；
It is connected with the horizontal scanning circuit, during according to the horizontal switches activation signal and horizontal switches of outside input
The horizontal scanning drive signal of clock signal output one drives the horizontal scanning circuit to the fingerprint to the horizontal scanning circuit
Carry out the level conversion register of horizontal pixel scanning.
Further, the clock pulses device also includes：
It is connected with the pel array, a mode switching signal is exported to described according to the mode control signal of outside input
Pel array, the mode switch element that the scan pattern to the pel array is switched over.
Further, the mode switch element can switch three kinds according to the mode control signal of outside input and different sweep
Pattern is retouched, is respectively：High definition scan pattern, classification scan pattern and zoom scan pattern；
The high definition scan pattern is in units of a pixel cell, to all pixels unit in the pel array
Carry out full frame scanning；The classification scan pattern is to combine every two row and every two row pixel cell to pixel battle array
Row are scanned；The zoom scan pattern only exports the partial pixel unit at the pel array center.
Further, the clock pulses device also includes：
Be connected with the fixed pattern noise compensation circuit, receive and store outside input the first storage control signal and
The storage control unit of second storage control signal；
It is connected with the fixed pattern noise compensation circuit, receives the selection pixel line reset signal and basis of outside input
The selection pixel line reset signal will scan that the obtained row pixel of vertical scanning fingerprint image is dimmed to answer through vertical pixel
Bit location.
Further, the fixed pattern noise compensation circuit includes：
It is connected with the reset unit and the storage control unit, will be through vertical according to first storage control signal
The emulated memory buffer cell that the row pixel for the vertical scanning fingerprint image that picture element scan is obtained is stored；
It is connected with the storage control unit, according to second storage control signal by the row in dimmed state
The secondary emulated memory buffer cell that pixel is stored；
It is connected with the output end of an emulated memory buffer cell and the secondary memory buffer unit storage, by institute
State the row pixel of an emulated memory buffer cell storage and the row pixel of the secondary memory buffer unit storage
Handled and exported after being amplified to the difference amplifier of the analog output module.
Further, the pel array includes 1280 × 1024 pixel cells.
Further, a brightness monitoring unit, each pixel of the pel array are integrated with the pel array
Unit includes the photodiode of a monitoring illuminance, and all photodiodes constitute the brightness monitoring unit, institute
The negative pole for having photodiode connects altogether, constitutes the output end of the brightness monitoring unit.
The another object of the embodiment of the present invention is to provide a kind of fingerprint sensor, and the fingerprint sensor is included as described above
Described fingerprint collecting circuit, the pel array of the fingerprint collecting circuit is packaged in the outer surface of the fingerprint sensor,
Other modules of the fingerprint collecting circuit are packaged in the inside of the fingerprint sensor, and outwards draw pin.
In an embodiment of the present invention, the fingerprint collecting circuit includes：Gather the minutiae feature and fingerprint sweat of fingerprint
The pel array in hole, the vertical scanning circuit that vertical scanning is carried out to fingerprint, the fingerprint image progress to being obtained through vertical scanning
The fixed pattern noise compensation circuit of noise compensation and the horizontal scanning circuit that horizontal sweep is carried out to fingerprint.The present invention's
In embodiment, the pel array can not only collect the minutiae feature of fingerprint, it will be appreciated also that ground collects fingerprint sweat
Hole, and the fingerprint collecting circuit carries out vertical pixel scanning, noise compensation and horizontal pixel scanning to fingerprint respectively, can be more
The fingerprint pore of human body is efficiently and accurately collected, i.e., on the basis of the identification of conventional fingerprint minutiae feature, is added to referring to
The collection and identification of line pore, improve the accuracy rate of fingerprint recognition.
Brief description of the drawings
Fig. 1 is the function structure chart for the fingerprint collecting circuit that first embodiment of the invention is provided；
Fig. 2 is the circuit structure diagram for the fingerprint collecting circuit that first embodiment of the invention is provided；
Fig. 3 is the schematic diagram of three kinds of different scan patterns of the fingerprint collecting circuit that first embodiment of the invention is provided,
Wherein (a) is the schematic diagram of high definition scan pattern, and (b) is the schematic diagram of classification scan pattern, and (c) shows for zoom scan pattern
It is intended to；
Fig. 4 be first embodiment of the invention provide fingerprint collecting circuit in brightness monitoring unit circuit diagram；
Fig. 5 is the pinouts for the fingerprint sensor that second embodiment of the invention is provided；
Fig. 6 is appearance and size and the position signal of pel array for the fingerprint sensor that second embodiment of the invention is provided
Figure.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
First embodiment
Fig. 1 shows the function structure chart of fingerprint collecting circuit provided in an embodiment of the present invention, for convenience of description, only shows
The part related to the embodiment of the present invention is gone out.
A kind of fingerprint collecting circuit, the fingerprint collecting circuit includes:
Gather the minutiae feature of fingerprint and the pel array 1 of fingerprint pore.In the present embodiment, the details of the fingerprint
Point feature includes starting point, terminal, binding site and bifurcation of fingerprint ridge etc..
As one embodiment of the invention, pel array 1 includes 1280 × 1024 pixel cells, i.e., in pel array 1
Contained pixel count is 1280 × 1024, and resolution ratio may be up to 2400DPI, and pel array 1 can not only collect fingerprint
Form and minutiae feature, it will be appreciated also that ground collects the fingerprint pore of human body.
The different control signals of outside input are received, and are believed according to the different corresponding driving of control signal output
Number clock pulses device 2.
It is connected respectively with clock pulses device 2 and pel array 1, the vertical scanning exported according to clock pulses device 2, which drives, to be believed
Number vertical pixel scanning is carried out to the fingerprint and the vertical scanning circuit 3 of vertical scanning fingerprint image is generated.
It is connected with clock pulses device 2, the noise compensation drive signal exported according to clock pulses device 2 is to the vertical scanning
Fingerprint image carries out the fixed pattern noise compensation circuit 4 of noise compensation.
It is connected respectively with clock pulses device 2, pel array 1 and fixed pattern noise compensation circuit 4 is connected, according to clock arteries and veins
The horizontal scanning drive signal for rushing the output of device 2 carries out horizontal pixel scanning to the fingerprint and generates horizontal sweep fingerprint image
Horizontal scanning circuit 5.
It is connected respectively with the output end and pel array 1 of fixed pattern noise compensation circuit 4, by the fingerprint image collected
The analog output module 6 exported.
Fig. 2 shows the circuit structure diagram of fingerprint collecting circuit provided in an embodiment of the present invention, for convenience of description, only shows
The part related to the embodiment of the present invention is gone out.
As one embodiment of the invention, the control signal of the outside input includes：Vertical converter activation signal
VSYNC, vertical converter clock signal VCLK, horizontal switches activation signal HSYNC, horizontal switches clock signal HCLK,
Mode control signal ZOOM, BIN and HD, selection pixel line reset signal RST, the storages of the first storage control signal RD1 and second
Control signal RD2.
As one embodiment of the invention, clock pulses device 2 includes：
It is connected with vertical scanning circuit 3, according to vertical the converter activation signal VSYNC and vertical converter of outside input
Clock signal VCLK exports a vertical scanning drive signal to vertical scanning circuit 3, drives 3 pairs of fingerprints of vertical scanning circuit
Carry out the vertical translation register 21 of vertical pixel scanning.Specifically, as vertical converter activation signal VSYNC and vertical conversion
When device clock signal VCLK is high level, vertical translation register 21 exports vertical scanning drive signal to vertical scanning circuit
3, vertical scanning circuit 3 proceeds by vertical pixel scanning, when a high level signal reaches vertical translation register 21,
Vertical converter clock signal VCLK will move a line.When scanning initialization, at least one vertical converter clock signal
In the VCLK cycles, vertical converter activation signal VSYNC needs to be switched back to low level.
It is connected with horizontal scanning circuit 5, according to the horizontal switches activation signal HSYNC and horizontal switches of outside input
Clock signal HCLK exports a horizontal scanning drive signal to horizontal scanning circuit 5, drives 5 pairs of fingerprints of horizontal scanning circuit
Carry out the level conversion register 22 of horizontal pixel scanning.Specifically, when horizontal switches activation signal HSYNC and level conversion
When device clock signal HCLK is high level, the output level scanning drive signal of level conversion register 22 to horizontal scanning circuit
5, horizontal scanning circuit 5 proceeds by horizontal pixel scanning, when a high level signal reaches level conversion register 22,
Horizontal switches clock signal HCLK will move a line.When scanning initialization, at least one horizontal switches clock signal
In the HCLK cycles, horizontal switches activation signal HSYNC needs to be switched back to low level.
As one embodiment of the invention, clock pulses device 2 also includes：
It is connected with pel array 1, a pattern switching is exported according to mode control signal ZOOM, BIN or HD of outside input
Signal is to pel array 1, the mode switch element 23 that the scan pattern to pel array 1 is switched over.
As one embodiment of the invention, mode switch element 23 can according to the mode control signal ZOOM of outside input,
BIN or HD switches three kinds of different scan patterns, is respectively：High definition scan pattern, classification scan pattern and zoom scan pattern.
Fig. 3 is the schematic diagram of three kinds of different scan patterns of the fingerprint collecting circuit that first embodiment of the invention is provided,
For convenience of description, it illustrate only the part related to the embodiment of the present invention.
In the present embodiment, the high definition scan pattern ((a) figure in Fig. 3) is to all pixels in pel array 1
Unit carries out full frame scanning, and each pixel cell constitutes a pixel, for example, pel array 1 includes 1280 × 1024 pixels
Unit, then under high definition scan pattern, be made up of per frame 1280 × 1024 pixels；The classification scan pattern is (in Fig. 3
(b) figure) it is that every two row and every two row pixel cell are combined and be scanned, every four pixel cells constitute a picture
Element, for example, pel array 1 includes 1280 × 1024 pixel cells, then under classification scan pattern, per frame by 640 × 512
Pixel is constituted；The partial pixel unit at zoom scan pattern ((c) figure in Fig. 3) center of output pixel array 1, for example, defeated
Go out 640 × 480 pixel cells at the center of pel array 1, under zoom scan pattern, the resolution ratio of pel array 1 can be as little as
1200DPI。
In the present embodiment, the activation of each scan pattern be by mode control signal ZOOM, BIN of outside input or
HD is come what is controlled, and when HD is high level, high definition scan pattern is activated；When BIN is high level, classification scan pattern activation；
When ZOOM is high level, zoom scan mode activation.The activation of scan pattern can be carried out at any time, can only be selected every time
Select a kind of scan pattern.
As one embodiment of the invention, clock pulses device 2 also includes：
Be connected with fixed pattern noise compensation circuit 4, receive and store outside input the first storage control signal RD1 and
Second storage control signal RD2 storage control unit 25；
It is connected with fixed pattern noise compensation circuit 4, receives the selection pixel line reset signal RST and basis of outside input
The selection pixel line reset signal RST is dimmed by the row pixel that obtained vertical scanning fingerprint image is scanned through vertical pixel
Reset unit 24.In the present embodiment, selection pixel line reset signal RST high level is effective.
As one embodiment of the invention, fixed pattern noise compensation circuit 4 includes：
It is connected with reset unit 24 and storage control unit 25, will be through vertical according to the first storage control signal RD1
The emulated memory buffer cell 41 that the row pixel for the vertical scanning fingerprint image that picture element scan is obtained is stored.In this reality
Apply in example, the first storage control signal RD1 high level is effective.
It is connected with storage control unit 25, according to the second storage control signal RD2 by described in dimmed state
The secondary emulated memory buffer cell 42 that row pixel is stored.In the present embodiment, the second storage control signal RD2 high level
Effectively.
The output end stored with an emulated memory buffer cell 41 and secondary memory buffer unit 42 is connected, by a mould
It is described in dimmed state that the row pixel and secondary memory buffer unit 42 of the storage of plan memory buffer unit 41 are stored
Row pixel is handled and exported after being amplified to the difference amplifier 43 of analog output module 6.
In the present embodiment, two output ends of analog output module 6 are respectively OUT1 and OUT2.
In the present embodiment, the row pixel of the vertical scanning fingerprint image obtained by being scanned through vertical pixel, is deposited first
When storing up control signal RD1 for high level, it is stored into an emulated memory buffer cell, then, the pixel line of outside input is answered
Position signal RST will force the row pixel for scanning resulting vertical scanning fingerprint image through vertical pixel dimmed, this dimmed shape
State is stored in secondary emulated memory buffer cell, difference amplifier when the second storage control signal RD2 is high level
43 will be handled different exposure rates twice and the row pixel of susceptibility, can effectively solve the noise problem of image.
Fig. 4 shows the circuit of the brightness monitoring unit 11 in the fingerprint collecting circuit that first embodiment of the invention is provided
Figure, for convenience of description, illustrate only the part related to the embodiment of the present invention.
As one embodiment of the invention, a brightness monitoring unit 11 is integrated with pel array 1, pel array 1
Each pixel cell includes the photodiode of a monitoring illuminance, and all photodiodes constitute brightness monitoring unit
11, the negative pole of all photodiodes connects altogether, constitutes the output end MPD of brightness monitoring unit 11.In the present embodiment, in photoelectricity
Under pattern, the sensing of pel array 1 depends on these photodiodes, the letter of the output end output of brightness monitoring unit 11
Number MPD provides moment illuminance information, and the signal does not have delayed sweep, and therefore, brightness monitoring unit 11 can be to pel array 1
Scanning directly monitored, to each component in the fingerprint collecting circuit play a part of protect and control.
Second embodiment
Second embodiment of the invention provides a kind of fingerprint sensor, and the fingerprint sensor is carried including first embodiment
Pel array 1 in the fingerprint collecting circuit of confession, the fingerprint collecting circuit is packaged in the outer surface of the fingerprint sensor,
The inside of the fingerprint sensor is packaged in for gathering other modules in fingerprint, the fingerprint collecting circuit, and outwards
Draw pin.
Fig. 5 shows the pinouts for the fingerprint sensor that second embodiment of the invention is provided, and for convenience of description, only shows
The part related to the embodiment of the present invention.
Table one is the explanation to the part pin of the fingerprint sensor.
Table one
As one embodiment of the invention, the pin can be by the way of paster.
Fig. 6 shows that the appearance and size of fingerprint sensor of second embodiment of the invention offer and the position of pel array show
It is intended to, for convenience of description, illustrate only the part related to the embodiment of the present invention.
As one embodiment of the invention, the appearance and size of the fingerprint sensor is：It is long × wide：15165um×
11731um, the area (i.e. the size of pel array 1) of effective pickup area is：It is long × wide：13568um × 10855um, effectively
Pickup area is in the position of the fingerprint sensor outer surface：Apart from the upper length of the fingerprint sensor, lower length, Zuo Kuan, the right side
Width is respectively：136um、740um、820um、777um.
As one embodiment of the invention, the external envelope dimensions of the fingerprint sensor are：Length × width × height：20mm×
15mm × 1.35mm, can also self-defined package dimension；The pixel size of the fingerprint sensor is：10.6um×10.6um；
The maximum pixel sweep speed (i.e. clock frequency) of the fingerprint sensor is 80MHz；The operating voltage of the fingerprint sensor
For 3.0~3.3V.
Below in conjunction with operation principle, embodiments of the invention are described further：
Whole fingerprint collecting process is divided into three steps：Vertical pixel scanning, fixed pattern noise compensation and horizontal pixel
Scanning, detailed process is as follows：When having fingerprint input, and the vertical converter activation signal VSYNC of outside input on pel array 1
When with vertical converter clock signal VCLK being high level, vertical translation register 21 exports a vertical scanning drive signal extremely
Vertical scanning circuit 3, vertical scanning circuit 3 proceeds by vertical pixel scanning, whenever a high level signal reaches vertical turn
When changing register 21, vertical converter clock signal VCLK will move a line, during scanning initialization, at least one vertical conversion
In the device clock signal VCLK cycles, vertical converter activation signal VSYNC needs to be switched back to low level；And swept through vertical pixel
The row pixel of vertical scanning fingerprint image obtained by retouching, when the first storage control signal RD1 is high level, is stored into once
In emulated memory buffer cell, then, the pixel line reset signal RST of outside input will be forced through obtained by vertical pixel scanning
Vertical scanning fingerprint image row pixel it is dimmed, this dimmed state the second storage control signal RD2 be high level when,
It is stored in secondary emulated memory buffer cell, difference amplifier 43 is by by different exposure rates twice and the row pixel of susceptibility
Handled, can effectively solve the noise problem of image；When the horizontal switches activation signal HSYNC and level of outside input turn
When parallel operation clock signal HCLK is high level, level conversion register 22 exports a horizontal scanning drive signal to horizontal sweep
Circuit 5, horizontal scanning circuit 5 proceeds by horizontal pixel scanning, whenever a high level signal reaches level conversion register
When 22, horizontal switches clock signal HCLK will move a line.When scanning initialization, at least one horizontal switches clock
In the signal HCLK cycles, horizontal switches activation signal HSYNC needs to be switched back to low level.
In an embodiment of the present invention, the fingerprint collecting circuit includes：Gather the minutiae feature and fingerprint sweat of fingerprint
The pel array in hole, the vertical scanning circuit that vertical scanning is carried out to fingerprint, the fingerprint image progress to being obtained through vertical scanning
The fixed pattern noise compensation circuit of noise compensation and the horizontal scanning circuit that horizontal sweep is carried out to fingerprint.The present invention's
In embodiment, the pel array can not only collect the minutiae feature of fingerprint, it will be appreciated also that ground collects fingerprint sweat
Hole, and the fingerprint collecting circuit carries out vertical pixel scanning, noise compensation and horizontal pixel scanning to fingerprint respectively, can be more
The fingerprint pore of human body is efficiently and accurately collected, i.e., on the basis of the identification of conventional fingerprint minutiae feature, is added to referring to
The collection and identification of line pore, improve the accuracy rate of fingerprint recognition.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of fingerprint collecting circuit, it is characterised in that the fingerprint collecting circuit includes:
Gather the minutiae feature of fingerprint and the pel array of fingerprint pore；
The different control signals of outside input are received, and corresponding drive signal is exported according to the different control signal
Clock pulses device；
It is connected respectively with the clock pulses device and the pel array, the vertical scanning exported according to the clock pulses device drives
Dynamic signal carries out vertical pixel scanning to the fingerprint and generates the vertical scanning circuit of vertical scanning fingerprint image；
It is connected, is vertically swept to described according to the noise compensation drive signal that the clock pulses device is exported with the clock pulses device
Retouch the fixed pattern noise compensation circuit that fingerprint image carries out noise compensation；
It is connected and fixed pattern noise compensation circuit connection with the clock pulses device, the pel array respectively, according to
The horizontal scanning drive signal of the clock pulses device output carries out horizontal pixel scanning to the fingerprint and generates horizontal sweep
The horizontal scanning circuit of fingerprint image；
It is connected respectively with the output end and the pel array of the fixed pattern noise compensation circuit, by the fingerprint image collected
As the analog output module exported.
2. fingerprint collecting circuit as claimed in claim 1, it is characterised in that the control signal of the outside input includes：Hang down
Straight converter activation signal, vertical converter clock signal, horizontal switches activation signal, horizontal switches clock signal, mould
Formula control signal, selection pixel line reset signal, the first storage control signal and the second storage control signal.
3. fingerprint collecting circuit as claimed in claim 2, it is characterised in that the clock pulses device includes：
It is connected, is believed according to the vertical converter activation signal of outside input and vertical converter clock with the vertical scanning circuit
Number one vertical scanning drive signal of output drives the vertical scanning circuit to carry out the fingerprint to the vertical scanning circuit
The vertical translation register of vertical pixel scanning；
It is connected, is believed according to the horizontal switches activation signal of outside input and horizontal switches clock with the horizontal scanning circuit
Number one horizontal scanning drive signal of output drives the horizontal scanning circuit to carry out the fingerprint to the horizontal scanning circuit
The level conversion register of horizontal pixel scanning.
4. fingerprint collecting circuit as claimed in claim 3, it is characterised in that the clock pulses device also includes：
It is connected with the pel array, a mode switching signal is exported to the pixel according to the mode control signal of outside input
Array, the mode switch element that the scan pattern to the pel array is switched over.
5. fingerprint collecting circuit as claimed in claim 4, it is characterised in that the mode switch element can be according to outside input
Mode control signal switch three kinds of different scan patterns, be respectively：High definition scan pattern, classification scan pattern and zoom are swept
Retouch pattern；
The high definition scan pattern is that in units of a pixel cell, all pixels unit in the pel array is carried out
Full frame is scanned；The classification scan pattern is that every two row and every two row pixel cell are combined and the pel array entered
Row scanning；The zoom scan pattern only exports the partial pixel unit at the pel array center.
6. fingerprint collecting circuit as claimed in claim 5, it is characterised in that the clock pulses device also includes：
It is connected with the fixed pattern noise compensation circuit, receives and store the first storage control signal and second of outside input
The storage control unit of storage control signal；
It is connected with the fixed pattern noise compensation circuit, receives the selection pixel line reset signal of outside input and according to described
Pixel line reset signal is selected by the dimmed reset list of the row pixel that obtained vertical scanning fingerprint image is scanned through vertical pixel
Member.
7. fingerprint collecting circuit as claimed in claim 6, it is characterised in that the fixed pattern noise compensation circuit includes：
It is connected with the reset unit and the storage control unit, will be through vertical pixel according to first storage control signal
Scan the emulated memory buffer cell that the row pixel of obtained vertical scanning fingerprint image is stored；
It is connected with the storage control unit, according to second storage control signal by the row pixel in dimmed state
The secondary emulated memory buffer cell stored；
It is connected with the output end of an emulated memory buffer cell and the secondary memory buffer unit storage, by described one
What the row pixel and the secondary memory buffer unit of secondary emulated memory buffer cell storage were stored is in dimmed state
The row pixel is handled and exported after being amplified to the difference amplifier of the analog output module.
8. fingerprint collecting circuit as claimed in claim 7, it is characterised in that the pel array includes 1280 × 1024 pictures
Plain unit.
9. fingerprint collecting circuit as claimed in claim 8, it is characterised in that a brightness prison is integrated with the pel array
Unit is controlled, each pixel cell of the pel array includes the photodiode of a monitoring illuminance, all photoelectricity two
Pole pipe constitutes the brightness monitoring unit, and the negative pole of all photodiodes connects altogether, constitutes the defeated of the brightness monitoring unit
Go out end.
10. a kind of fingerprint sensor, it is characterised in that the fingerprint sensor is included as described in claim any one of 1-9
Fingerprint collecting circuit, the pel array of the fingerprint collecting circuit is packaged in the outer surface of the fingerprint sensor, the finger
Other modules of line Acquisition Circuit are packaged in the inside of the fingerprint sensor, and outwards draw pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610032752.5A CN106980808B (en) | 2016-01-18 | 2016-01-18 | Fingerprint acquisition circuit and fingerprint sensor |
Applications Claiming Priority (1)
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| CN109891429A (en) * | 2018-12-26 | 2019-06-14 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and fingerprint identification method |
| CN111027516A (en) * | 2019-12-25 | 2020-04-17 | 北京集创北方科技股份有限公司 | Biological characteristic image acquisition device and method and intelligent equipment |
| CN111684456A (en) * | 2018-02-07 | 2020-09-18 | 华为技术有限公司 | Fingerprint acquisition device and fingerprint acquisition method |
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| CN111684456A (en) * | 2018-02-07 | 2020-09-18 | 华为技术有限公司 | Fingerprint acquisition device and fingerprint acquisition method |
| CN111684456B (en) * | 2018-02-07 | 2023-12-08 | 华为技术有限公司 | Fingerprint acquisition device and fingerprint acquisition method |
| CN109891429A (en) * | 2018-12-26 | 2019-06-14 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and fingerprint identification method |
| CN109891429B (en) * | 2018-12-26 | 2023-05-26 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and fingerprint identification method |
| CN111027516A (en) * | 2019-12-25 | 2020-04-17 | 北京集创北方科技股份有限公司 | Biological characteristic image acquisition device and method and intelligent equipment |
| CN111027516B (en) * | 2019-12-25 | 2024-01-26 | 北京集创北方科技股份有限公司 | Biological characteristic image acquisition device, biological characteristic image acquisition method and intelligent equipment |
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