CN107820618A - Sensing pixels unit and optical fingerprint sensor - Google Patents
Sensing pixels unit and optical fingerprint sensor Download PDFInfo
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- CN107820618A CN107820618A CN201780001293.7A CN201780001293A CN107820618A CN 107820618 A CN107820618 A CN 107820618A CN 201780001293 A CN201780001293 A CN 201780001293A CN 107820618 A CN107820618 A CN 107820618A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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Abstract
This application provides a kind of sensing pixels unit, the sensing pixels unit includes pixel photosite, including multiple photo-sensitive cells, for receiving illumination and exporting multiple photosensitive sub-pixel values corresponding to the multiple photo-sensitive cell, the photosensitive sub-pixel value of each of which corresponds to one first photosensitive area；Multiple reference elements, output refer to sub-pixel value corresponding to the multiple of the multiple reference element, and each of which corresponds to one second photosensitive area with reference to sub-pixel value, and second photosensitive area is less than first photosensitive area；And integral unit, the multiple photo-sensitive cell and the multiple reference element are coupled to, for according to the multiple photosensitive sub-pixel value and the multiple pixel value for referring to sub-pixel value, exporting the corresponding sensing pixels unit.
Description
Technical field
The application is related to a kind of sensing pixels unit and optical fingerprint sensor, more particularly to a kind of temperature that improves causes shadow
As inconsistent sensing pixels unit and optical fingerprint sensor.
Background technology
As science and technology is maked rapid progress, mobile phone, digital camera, tablet PC, notebook computer etc. are more and more to be taken
Banding pattern electronic installation has become instrument indispensable in people's life.Because portable electronic apparatus is generally personal use,
And there is certain privacy, therefore the data of its internal reservoir, such as telephone directory, photograph, personal information etc. are private institute
Have.Once losing, if these data may be utilized electronic installation by other people, and cause unnecessary loss.Although mesh
It is preceding to avoid electronic installation from being used by other people using the mode of cryptoguard, but password is easily revealed or cracked,
With relatively low security.Also, user need to remember that password could use electronic installation, if forgetting Password, can bring use
The many inconvenience of person.Therefore, develop at present using the mode of personal fingerprint recognition system to reach the purpose of authentication, to carry
Rise Information Security.
On the other hand, with the progress of identification of fingerprint technology, stealthy fingerprint sensor (Invisible Fingerprint
Sensor, IFS) gradually favored by consumer.In stealthy fingerprint sensing technology, optical fingerprint sensor may be disposed at
(Under Display) fingerprint sensing under the lower section of display screen, i.e. screen.In other words, user can pass through pressing display screen with
Carry out identification of fingerprint.However, due to the factor of processing procedure, the sensing pixels unit in fingerprint sensor may be by metal
Pollution, and there is different sensitivity to temperature, and cause when temperature is higher, multiple sensing pixels of optical fingerprint sensor
The inconsistent or uneven of multiple pixel values that unit is exported can be more serious, for example, more not in the case of by illumination
Standard deviation of the multiple pixel values of individual sensing pixels unit output when temperature is 25 DEG C, 37 DEG C, 41 DEG C, 55 DEG C
(Standard Deviation, STD) is respectively 1.3,1.9,2.7,9.9 unit amounts.(the Under under the screen of reality
Display in) applying, because optical fingerprint sensor is arranged at the lower section of display screen, therefore can be distributed by display screen
Heat, and make it that the inconsistent or uneven of fingermark image can be more serious, influence the accuracy of fingerprint interpretation.Therefore, existing skill
Art has improved necessity in fact.
The content of the invention
Therefore, the purpose of the application section Example is that providing a kind of improvement temperature causes the inconsistent sensing of image
Pixel cell and optical fingerprint sensor, the shortcomings that to improve prior art.
In order to solve the above-mentioned technical problem, the embodiment of the present application provides a kind of sensing pixels unit, refers to applied to optics
In line sensor, a pixel value of the corresponding sensing pixels unit of sensing pixels unit output, the sensing pixels list
Member includes pixel photosite, including multiple photo-sensitive cells, for receiving illumination and exporting to correspond to the multiple photo-sensitive cell
Multiple photosensitive sub-pixel values, the photosensitive sub-pixel value of each of which corresponds to one first photosensitive area；Multiple reference elements, output
Multiple corresponding to the multiple reference element refer to sub-pixel value, and each of which is photosensitive corresponding to one second with reference to sub-pixel value
Area, second photosensitive area are less than first photosensitive area；And integral unit, it is coupled to the multiple photo-sensitive cell
And the multiple reference element, for according to the multiple photosensitive sub-pixel value and it is the multiple refer to sub-pixel value, it is defeated
Go out the pixel value of the corresponding sensing pixels unit.
For example, a reference element includes light sensitive diode in the multiple reference element, there is photosensitive region；And light blocking
Layer, is arranged on the photosensitive region of light sensitive diode described in the reference element.
For example, the photosensitive region is completely covered in the shading layer, second photosensitive area is zero.
For example, the shading layer part covers the photosensitive region.
For example, the shading layer is the metal level in integrated circuit layout.
For example, the integral unit includes reference statistical unit, for calculating the multiple reference with reference to sub-pixel value
Statistic；With reference to averaging unit, receive one and refer to threshold value, and threshold value and the reference statistical amount are referred to according to described,
Calculate and one refer to average value with reference to sub-pixel value corresponding to the multiple；Photosensitive statistic unit, for calculating the multiple sense
The photosensitive statistic of sub-pixels value；Lookup unit, for according to the photosensitive statistic, exporting a photosensitive threshold value；It is photosensitive
Averaging unit, for corresponding to the multiple photosensitive sub- picture according to the photosensitive threshold value and the photosensitive statistic, calculating
One photosensitive average value of element value；And subtrator, it is coupled to described with reference to averaging unit and the photosensitive averaging unit, use
Subtract each other result with reference to average value with described to export the pixel value for the photosensitive average value.
For example, described be used for performing following steps with reference to averaging unit, to refer to threshold value and the ginseng according to described
Statistic is examined, calculating is described to refer to average value：According to the reference statistical amount and it is described refer to threshold value, choose the multiple
With reference to multiple nominal reference sub-pixel values in sub-pixel value, each of which nominal reference sub-pixel value and the difference of the reference statistical amount
Value refers to threshold value less than or equal to described；And calculate it is described with reference to average value for the multiple nominal reference sub-pixel value
Average value.
For example, the reference statistical amount for it is the multiple with reference to the minimum value of sub-pixel value, median or average value wherein
One of.
For example, the photosensitive averaging unit is used for performing following steps, with according to the photosensitive threshold value and the sense
Light statistic, calculate the photosensitive average value：According to the photosensitive statistic and the photosensitive threshold value, choose the multiple
Multiple normal photosensitive sub-pixel values in photosensitive sub-pixel value, each of which normally photosensitive sub-pixel value and the difference of the photosensitive statistic
Value is less than or equal to the photosensitive threshold value；And the photosensitive average value is calculated as the multiple normal photosensitive sub-pixel value
Average value.
For example, the photosensitive statistic for the multiple photosensitive sub-pixel value minimum value, median or average value wherein
One of.
For example, the sensing pixels unit also includes analog-digital converter, the multiple photo-sensitive cell and described more is coupled to
Between individual reference element and the integral unit.
In order to solve the above-mentioned technical problem, the embodiment of the present application additionally provides a kind of optical fingerprint sensor, including multiple
Sensing pixels unit, for exporting the multiple pixel values for corresponding to multiple sensing pixels units, each of which sensing pixels unit
Foregoing sensing pixels unit, multiple pixel photosites of the multiple sensing pixels unit are arranged in array.
For example, the optical fingerprint sensor is arranged under the display screen of electronic installation.
For example, the optical fingerprint sensor is coupled to finger print identification unit, the finger print identification unit is used for according to phase
In the multiple pixel value of the multiple sensing pixels unit, the fingerprint of user should be judged.
The embodiment of the present application forms sensing pixels unit using multiple photo-sensitive cells and multiple reference elements；Using to light
Caused by insensitive reference element the signal influenceed in photosensitive sub-pixel by temperature is cancelled or compensated for reference to sub-pixel
Composition；The element to very temperature sensitive is rejected using integral unit and eliminates noise.The application improves in the prior art because of temperature
It is inconsistent or uneven caused by degree, apply and recognize field in optical finger print, the application strengthens the precision of identification of fingerprint.
Brief description of the drawings
Fig. 1 is the diagrammatic cross-section of the electronic installation of the embodiment of the present application one；
Fig. 2 is the function block schematic diagram of Fig. 1 electronic installations；
Fig. 3 is the schematic diagram of the sensing pixels unit of the embodiment of the present application one；
Fig. 4 is the schematic diagram of the embodiment of the present application photo-sensitive cell and reference element；
Fig. 5 is the schematic diagram of the integral unit of the embodiment of the present application one.
Embodiment
In order that the object, technical solution and advantage of the application are more clearly understood, it is right below in conjunction with drawings and Examples
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, and
It is not used in restriction the application.
Fig. 1 to Fig. 3 is refer to, Fig. 1 is the diagrammatic cross-section of the electronic installation 10 of the embodiment of the present application one, and Fig. 2 is the application
The function block schematic diagram of embodiment electronic installation 10, Fig. 3 are the schematic diagram of the sensing pixels unit 30 of the embodiment of the present application one.For
Facilitate explanation, Fig. 1 to Fig. 3 only illustrates the element related to the present application feature, and omits incoherent element.Electronics fills
Putting 10 includes display screen 12, optical fingerprint sensor 14 and finger print identification unit 16, and optical fingerprint sensor 14 is arranged at aobvious
Under display screen 12 (being (Under Display) fingerprint sensing under screen), and it is coupled to finger print identification unit 16.Optical finger print
Sensor 14 includes multiple sensing pixels units 30, and multiple sensing pixels units 30 export multiple pixel value PX_out and extremely referred to respectively
Line identification unit 16 (i.e. each sensing pixels unit 30 exports pixel value PX_out corresponding to it to finger print identification unit 16),
Finger print identification unit 16 according to multiple pixel value PX_out corresponding to multiple sensing pixels units 30, can judge the finger of user
Line.Wherein, the photosensitive area of each sensing pixels unit 30 can substantially 50 × 50 μm2So that optical fingerprint sensor 14 can
At least there is the resolution ratio of 508 dots per inch (Dots Per Inch, DPI), it is sufficient to accurately pick out fingerprint.
Specifically, each sensing pixels unit 30 includes pixel photosite 32, analog-digital converter ADC and integrated single
Member 34, and multiple pixel photosites 32 of multiple sensing pixels units 30 can turn into an array in an arranged on planes, wherein
Substantially 50 × 50 μm of the area of pixel photosite 322.Pixel photosite 32 includes multiple photo-sensitive cell AP and multiple
Reference element OBP, in the embodiment depicted in Fig. 3, sensing pixels unit 30 includes 12 photo-sensitive cell AP and 4 references
Element OBP (i.e. N=12 and K=4), and it is not subject to the limits.Multiple photo-sensitive cell AP and multiple reference element OBP can be photosensitive in pixel
An array is separately arranged in region where unit 32, multiple photo-sensitive cell AP are exportable corresponding to the more of multiple photo-sensitive cell AP
Individual photosensitive sub-pixel value LSP1~LSPN, the exportable multiple references corresponding to multiple reference element OBP of multiple reference element OBP
Sub-pixel value RP1~RPK.In addition, multiple photo-sensitive cell AP and multiple reference element OBP be coupled to through analog-digital converter ADC it is whole
Unit 34 is closed, in other words, analog-digital converter ADC is by the photosensitive sub-pixel value LSP of simulation1~LSPNAnd with reference to sub-pixel value RP1
~RPKIt is converted into the photosensitive sub-pixel value LSP of numeral1~LSPNAnd with reference to sub-pixel value RP1~RPK, integral unit 34
To the photosensitive sub-pixel value LSP of numeral1~LSPNAnd with reference to sub-pixel value RP1~RPKComputing and processing are carried out, to produce correspondingly
The pixel value PX_out of sensing pixels unit 30.
Photo-sensitive cell AP is used for actually receiving illumination and (it can be considered active picture point for generation photoelectron or photoelectric current according to this
(Active Pixel)), its high sensitivity to light.However, photo-sensitive cell AP may have difference because of processing procedure factor to temperature
Sensitivity.Therefore, in order to reduce/eliminate influence of the temperature to pixel value PX_out, sensing pixels unit 30 is utilized to light not
Sensitive reference element OBP eliminates the/influence of compensation temperature, and reference element OBP can be considered the black picture point (Optical of optics
Black Pixel)。
Specifically, Fig. 4 is refer to, Fig. 4 is photo-sensitive cell of embodiment of the present invention AP, reference element OBP1 and reference member
Part OBP2 schematic top plan view.Reference element OBP1 and reference element OBP2 all can be used to realize the ginseng in pixel photosite 32
Examine element OBP.Photo-sensitive cell AP, reference element OBP1 and reference element OBP2 all include having identical photosensitive region/area
Light sensitive diode, wherein light sensitive diode has photosensitive region LSA and non-photo-sensing region NSA, and photosensitive region LSA has
Photosensitive area A1.Photo-sensitive cell AP is merely light sensitive diode, that is to say, that photo-sensitive cell AP have photosensitive region LSA with
And non-photo-sensing region NSA, and photosensitive region LSA area is photosensitive area A1.On the other hand, it is different from photo-sensitive cell AP
It is that reference element OBP also includes a shading layer LBL in addition to light sensitive diode, shading layer LBL can be integrated circuit layout
Metal level (Metal) in (IC Layout), it is arranged on the photosensitive region of light sensitive diode.Shading layer LBL is used for contracting
The photosensitive region of light sensitive diode in small reference element OBP, that is, it is used for reducing sensitivity of the reference element OBP to light so that phase
Should be A2=A1- Δs in reference element OBP photosensitive area A2A, wherein ΔAShading layer LBL is represented in light sensitive diode photosensitive area
The photosensitive area A2 of the projected area in domain, i.e. reference element OBP is less than photo-sensitive cell AP photosensitive area A1.In short, compare
In photo-sensitive cell AP, sensitivity of the reference element OBP to light is less than sensitivity of the photo-sensitive cell AP to light.
In an embodiment, the photosensitive region of light sensitive diode in reference element OBP is completely covered in shading layer LBL, that is, joins
The photosensitive area A2 for examining element OBP is zero, reference element OBP1 as shown in Figure 4, reference that reference element OBP1 is exported
Pixel is not only affected by temperature by illumination effect, it can be used to eliminate/compensated pixel value PX_out in influenceed by temperature
Signal composition.
Further, in another embodiment, light sensitive diode in shading layer LBL part covering reference elements OBP
Photosensitive region, the reference sub-pixel that reference element OBP2 as shown in Figure 4, reference element OBP2 are exported is by a little illumination shadow
Ring and temperature influence, it can be used to eliminate/compensated pixel value PX_out in by the signal that temperature and bias light are influenceed into
Part.
In short, with reference to sub-pixel value RP caused by reference element OBP1~RPKCompared to photo-sensitive cell AP by illumination
Influence it is smaller (or even not influenceed completely by illumination, such as reference element OBP1), and reference element OBP and photo-sensitive cell AP by
Influence degree to temperature is identical, therefore, integral unit 34 detecting with exclude element (photo-sensitive cell AP or reference element OBP) because
Thermal imagery vegetarian refreshments (Hot Pixel, or referred to as white pixel point (White Pixel)) caused by processing procedure factor, and utilize reference
With reference to sub-pixel value RP caused by component OBP1~RPKTo compensate photosensitive sub-pixel value LSP caused by photosensory assembly AP1~
LSPN。
Specifically, Fig. 5 is refer to, Fig. 5 is the schematic diagram of the embodiment of the present application integral unit 34, and integral unit 34 includes
Photosensitive statistic unit 50, lookup unit 52, photosensitive averaging unit 54, reference statistical unit 56, with reference to averaging unit 58 and subtract
Method cell S UB.Reference statistical unit 56 is used for calculating with reference to sub-pixel value RP1~RPKReference statistical amount RPM, wherein with reference to system
Measure RPMCan be with reference to sub-pixel value RP1~RPKOne of minimum value, median or average value.With reference to averaging unit 58
Receive reference statistical amount RPMAnd one refer to threshold value D_th, and according to refer to threshold value D_th and reference statistical amount RPM, meter
Calculate to correspond to and refer to sub-pixel value RP1~RPKOne with reference to average value RPAVE, wherein with reference to threshold value D_th can before dispatching from the factory by
Producers set.Similarly, photosensitive statistic unit 50 is used for calculating photosensitive sub-pixel value LSP1~LSPNPhotosensitive statistic
LSPM, photosensitive statistic LSPMCan be photosensitive sub-pixel value LSP1~LSPNOne of minimum value, median or average value.
Photosensitive averaging unit 54 receives photosensitive statistic LSPMAnd a photosensitive threshold value L_th, and according to photosensitive threshold value L_th and
Photosensitive statistic LSPM, calculate and correspond to photosensitive sub-pixel value LSP1~LSPNA photosensitive average value LSPAVE, wherein photosensitive face
Limit value L_th can be obtained by tabling look-up.Subtrator SUB is coupled to photosensitive averaging unit 54 and reference averaging unit 58, for inciting somebody to action
Photosensitive average value LSPAVEWith referring to average value RPAVESubtract each other, using output pixel value PX_out as photosensitive average value LSPAVEWith reference
Average value RPAVESubtract each other result, such as PX_out=LSPAVE- RPAVE, subtrator SUB is to be used for performing a common item refusal
(Common-tern Rejection) computing.In addition, photosensitive statistic LSP can be stored in lookup unit 52MWith photosensitive threshold
Corresponding relation between value L_th, and its corresponding relation can establish completion in advance in electronic installation 10t calibration phase, therefore,
When electronic installation 10 carries out normal operating, lookup unit 52 can be according to photosensitive statistic LSPMExport corresponding to it photosensitive faces
Limit value L_th.
Calculated with reference to averaging unit 58 and refer to average value RPAVEDetails details are as follows.Inspected one by one with reference to averaging unit 58
With reference to sub-pixel value RP1~RPKWith reference statistical amount RPMDifference whether be more than and refer to threshold value D_th, wherein difference can be to join
Examine sub-pixel value RP1~RPKIn it is any with reference to sub-pixel value RPkWith reference statistical amount RPMThe absolute value for subtracting each other result, i.e., |
RPk-RPM|.If difference | RPk-RPM| more than threshold value D_th is referred to, representative refers to sub-pixel value RPkCorresponding reference element
OBP is highly prone to temperature influence, therefore will refer to sub-pixel value RP with reference to averaging unit 58kReject, i.e., refer to average value in calculating
RPAVEWhen do not use difference | RPk-RPM| more than the reference sub-pixel value RP with reference to threshold value D_thk.On the other hand, if with reference to son
Pixel value RPkWith reference statistical amount RPMDifference | RPk-RPM| less than or equal to threshold value D_th is referred to, representative refers to sub-pixel
Value RPkFor nominal reference sub-pixel value, average value RP is referred to calculatingAVEWhen will refer to sub-pixel value RP with reference to averaging unit 58k
Include calculating and refer to average value RPAVEWhen consideration.In an embodiment, sub-pixel value RP is referred to eachk(k=1 ...,
K for), difference is worked as | RPk-RPM| during more than with reference to threshold value D_th, sub-pixel value RP is referred to by corresponding with reference to averaging unit 58k
Weight wkIt is set to 0；Work as difference | RPk-RPM| during less than or equal to reference to threshold value D_th, join with reference to averaging unit 58 by corresponding
Examine sub-pixel value RPkWeight wkIt is set to 1；Consequently, it is possible to it can be calculated with reference to average value RP with reference to averaging unit 58AVEFor RPAVE=
(Σk wk*RPk)/(Σk wk) (formula 1).In other words, with reference to averaging unit 58 first from reference to sub-pixel value RP1~RPKIn
Select multiple nominal reference sub-pixel values (each of which nominal reference sub-pixel value and reference statistical amount RPMDifference be less than or
Equal to reference to threshold value D_th), then calculate with reference to average value RPAVEFor the average value of multiple nominal reference sub-pixel values.
Similarly, photosensitive averaging unit 54 inspects photosensitive sub-pixel value LSP one by one1~LSPNWith photosensitive statistic LSPM's
Whether difference is more than photosensitive threshold value L_th, and wherein difference can be photosensitive sub-pixel value LSP1~LSPNIn any photosensitive sub-pixel
Value LSPnWith photosensitive statistic LSPMThe absolute value for subtracting each other result, i.e., | LSPn-LSPM|.If difference | LSPn-LSPM| more than sense
Come limit value L_th, represent photosensitive sub-pixel value LSPnCorresponding photo-sensitive cell AP is highly prone to temperature influence, therefore photosensitive flat
Equal unit 54 is by photosensitive sub-pixel value LSPnReject, that is, calculating photosensitive average value LSPAVEWhen do not use difference | LSPn-LSPM|
Photosensitive sub-pixel value LSP more than photosensitive threshold value L_thn.On the other hand, if photosensitive sub-pixel value LSPnWith photosensitive statistic
LSPMDifference | LSPn-LSPM| less than or equal to photosensitive threshold value L_th, represent photosensitive sub-pixel value LSPnFor normal photosensitive son
Pixel value, calculating photosensitive average value LSPAVEWhen photosensitive averaging unit 54 by photosensitive sub-pixel value LSPnInclude and calculate photosensitive put down
Average LSPAVEWhen consideration.In an embodiment, to each photosensitive sub-pixel value LSPnFor (n=1 ..., N), work as difference
|LSPn-LSPM| during more than photosensitive threshold value L_th, photosensitive averaging unit 54 will corresponding photosensitive sub-pixel value LSPnWeight cnIf
For 0；Work as difference | LSPn-LSPM| during less than or equal to photosensitive threshold value L_th, photosensitive averaging unit 54 will corresponding photosensitive sub-pixel
Value LSPnWeight cnIt is set to 1；Consequently, it is possible to photosensitive averaging unit 54 can calculate photosensitive average value LSPAVEFor LSPAVE=(Σn
cn*LSPn)/(Σn cn) (formula 2).In other words, photosensitive averaging unit 54 is first from photosensitive sub-pixel value LSP1~LSPNIn choose
Select multiple normal photosensitive sub-pixel values (each of which normally photosensitive sub-pixel value and photosensitive statistic LSPMDifference be less than or wait
In photosensitive threshold value L_th), then calculate photosensitive average value LSPAVEFor the average value of multiple normal photosensitive sub-pixel values.
For another angle, it can not only be rejected with reference to averaging unit 58 by thermally sensitive reference element OBP institutes
It is caused to refer to sub-pixel value, average computing is taken using formula 1, noise can be also eliminated with reference to averaging unit 58；Similarly, feel
Light averaging unit 54 can not only be rejected refers to sub-pixel value as caused by thermally sensitive photo-sensitive cell AP, utilizes formula
2 take average computing, and photosensitive averaging unit 54 can also eliminate noise.In addition, using subtrator SUB, can be by sensing pixels list
The composition that member 30 is influenceed by temperature eliminates (or compensation is returned).
Consequently, it is possible to the application can significantly reduce multiple pixel value PX_out of multiple outputs of sensing pixels units 30 not
It is consistent or uneven.Specifically, when temperature is 25 DEG C, 37 DEG C, 41 DEG C, 55 DEG C, multiple sensing pixels units 30 are exported
Multiple pixel value PX_out standard deviation (Standard Deviation, STD) be respectively 0.7,0.9,1.0,1.4 list
Bit value.Particularly in the event of high temperatures, the degree that standard deviation declines is particularly evident, when temperature is 41 DEG C, 55 DEG C, mark
Quasi- deviation declines 2.7,7.0 times respectively.
Integral unit is not limited to realize using ad hoc fashion, and it can be with buffer transmitting stage (Register-Transfer
Level, RTL) digital circuit or ASIC (the Application-Specific Integrated such as circuit
Circuit, ASIC) to realize, in addition it is next using digital signal processor (Digital Signal Processor, DSP)
Realize.
In summary, the application forms sensing pixels unit using multiple photo-sensitive cells and multiple reference elements；Utilize
Cancel or compensate for what is influenceed in photosensitive sub-pixel by temperature with reference to sub-pixel caused by the reference element insensitive on light
Signal composition；The element to very temperature sensitive is rejected using integral unit and eliminates noise.The application improves in the prior art
It is inconsistent or uneven caused by temperature, apply and recognize field in optical finger print, the application strengthens the accurate of identification of fingerprint
Degree.
The section Example of the application is the foregoing is only, not limiting the application, all essences in the application
All any modification, equivalent and improvement made within refreshing and principle etc., should be included within the protection domain of the application.
Claims (14)
1. a kind of sensing pixels unit, applied in optical fingerprint sensor, the sensing pixels unit output corresponds to the biography
Feel a pixel value of pixel cell, it is characterised in that the sensing pixels unit includes：
Pixel photosite, including：
Multiple photo-sensitive cells, for receiving illumination and exporting multiple photosensitive sub-pixel values corresponding to the multiple photo-sensitive cell,
The photosensitive sub-pixel value of each of which corresponds to one first photosensitive area；
Multiple reference elements, output refer to sub-pixel value corresponding to the multiple of the multiple reference element, and each of which is with reference to son
Pixel value corresponds to one second photosensitive area, and second photosensitive area is less than first photosensitive area；And
Integral unit, the multiple photo-sensitive cell and the multiple reference element are coupled to, for according to the multiple photosensitive
Sub-pixel value and the multiple pixel value for referring to sub-pixel value, exporting the corresponding sensing pixels unit.
2. sensing pixels unit as claimed in claim 1, it is characterised in that a reference element bag in the multiple reference element
Include：
Light sensitive diode, there is photosensitive region；And
Shading layer, it is arranged on the photosensitive region of light sensitive diode described in the reference element.
3. sensing pixels unit as claimed in claim 2, it is characterised in that the photosensitive area is completely covered in the shading layer
Domain, second photosensitive area is zero.
4. sensing pixels unit as claimed in claim 2, it is characterised in that the shading layer part covers the photosensitive area
Domain.
5. sensing pixels unit as claimed in claim 2, it is characterised in that the shading layer is the gold in integrated circuit layout
Belong to layer.
6. sensing pixels unit as claimed in claim 1, it is characterised in that the integral unit includes：
Reference statistical unit, for calculating the multiple reference statistical amount with reference to sub-pixel value；
With reference to averaging unit, receive one and refer to threshold value, and threshold value and the reference statistical amount are referred to according to described, calculate
Corresponding to the multiple one average value is referred to reference to sub-pixel value；
Photosensitive statistic unit, for calculating the photosensitive statistic of the multiple photosensitive sub-pixel value；
Lookup unit, for according to the photosensitive statistic, exporting a photosensitive threshold value；
Photosensitive averaging unit, for according to the photosensitive threshold value and the photosensitive statistic, calculating corresponding to the multiple
One photosensitive average value of photosensitive sub-pixel value；And
Subtrator, reference averaging unit and the photosensitive averaging unit are coupled to, is for exporting the pixel value
The photosensitive average value subtracts each other result with described with reference to average value.
7. sensing pixels unit as claimed in claim 6, it is characterised in that described to be used for performing following step with reference to averaging unit
Suddenly, to refer to threshold value and the reference statistical amount according to described, calculating is described to refer to average value：
According to the reference statistical amount and it is described refer to threshold value, choose the multiple with reference to multiple normal ginsengs in sub-pixel value
Sub-pixel value is examined, each of which nominal reference sub-pixel value and the difference of the reference statistical amount refer to threshold less than or equal to described
Value；And
Calculate described with reference to the average value that average value is the multiple nominal reference sub-pixel value.
8. sensing pixels unit as claimed in claim 6, it is characterised in that the reference statistical amount is to be the multiple with reference to son
One of minimum value, median or average value of pixel value.
9. sensing pixels unit as claimed in claim 6, it is characterised in that the photosensitive averaging unit is used for performing following step
Suddenly, with according to the photosensitive threshold value and the photosensitive statistic, the calculating photosensitive average value：
According to the photosensitive statistic and the photosensitive threshold value, multiple normal senses in the multiple photosensitive sub-pixel value are chosen
Sub-pixels value, normally photosensitive sub-pixel value and the difference of the photosensitive statistic are less than or equal to the photosensitive threshold to each of which
Value；And
Calculate average value of the photosensitive average value for the multiple normal photosensitive sub-pixel value.
10. sensing pixels unit as claimed in claim 6, it is characterised in that the photosensitive statistic is the multiple photosensitive
One of minimum value, median or average value of sub-pixel value.
11. sensing pixels unit as claimed in claim 1, it is characterised in that also include：
Analog-digital converter, it is coupled between the multiple photo-sensitive cell and the multiple reference element and the integral unit.
A kind of 12. optical fingerprint sensor, it is characterised in that including：
Multiple sensing pixels units, for exporting the multiple pixel values for corresponding to multiple sensing pixels units, each of which sensing
Pixel cell is the sensing pixels unit described in any one in claim 1-11, the multiple sensing pixels unit it is multiple
Pixel photosite is arranged in array.
13. optical fingerprint sensor as claimed in claim 12, it is characterised in that the optical fingerprint sensor is arranged at electricity
Under the display screen of sub-device.
14. optical fingerprint sensor as claimed in claim 12, it is characterised in that the optical fingerprint sensor is coupled to finger
Line identification unit, the finger print identification unit are used for according to the multiple pixel for corresponding to the multiple sensing pixels unit
Value, judge the fingerprint of user.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/104941 WO2019061477A1 (en) | 2017-09-30 | 2017-09-30 | Sensing pixel unit and optical fingerprint sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107820618A true CN107820618A (en) | 2018-03-20 |
| CN107820618B CN107820618B (en) | 2022-05-17 |
Family
ID=61606875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780001293.7A Active CN107820618B (en) | 2017-09-30 | 2017-09-30 | Sensing pixel unit and optical fingerprint sensor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107820618B (en) |
| WO (1) | WO2019061477A1 (en) |
Cited By (5)
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| WO2019061477A1 (en) | 2019-04-04 |
| CN107820618B (en) | 2022-05-17 |
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