CN109657606A - The bearing calibration of optical fingerprint sensor mould group - Google Patents
The bearing calibration of optical fingerprint sensor mould group Download PDFInfo
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- CN109657606A CN109657606A CN201811543947.1A CN201811543947A CN109657606A CN 109657606 A CN109657606 A CN 109657606A CN 201811543947 A CN201811543947 A CN 201811543947A CN 109657606 A CN109657606 A CN 109657606A
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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
Abstract
A kind of bearing calibration of optical fingerprint sensor mould group, it include: that optical fingerprint sensor mould group is provided, optical fingerprint sensor mould group includes: light-emitting display panel, and the light-emitting display panel includes light source region, and the light source region includes the first sub-light source region to N sub-light source region；Optical sensor, optical sensor include acquisition zone, and acquisition zone includes the first sub- sensing unit to the sub- sensing unit N, and the i-th sub-light source area is located at the surface of the i-th sub- sensing unit；The correction subgraph group of the first sub- sensing unit is obtained one by one to the correction subgraph group of the sub- sensing unit N；The method for obtaining the correction subgraph group of the i-th sub- sensing unit includes: to light the i-th sub-light source region；Obtain the correction subgraph group that the i-th sub- sensing unit is lit under state in the i-th sub-light source region；According to the correction subgraph group of the first sub- sensing unit to the correction subgraph group of the sub- sensing unit N, the correction total figure picture group of the optical sensor is obtained.The method improves correction accuracy.
Description
Technical field
The present invention relates to fingerprint sensing field more particularly to a kind of bearing calibrations of optical fingerprint sensor mould group.
Background technique
Fingerprint imaging identification technology is the fingerprint image that human body is collected by optical fingerprint sensor, then with system
In existing fingerprint imaging information be compared, whether carrying out correct judgment, so realize identification technology.Due to its use
Convenience and somatic fingerprint uniqueness, fingerprint imaging identification technology has been widely used in every field, such as public security bureau
With field of safety check, the access control system of building and the consumer product areas such as PC and mobile phone such as customs etc..
The imaging mode of fingerprint imaging identification technology has the multiple technologies such as optical imagery, capacitance imaging, ultrasonic imaging.Relatively
For, optical finger print imaging identification technology imaging effect is relatively preferable, and equipment cost is relatively low.
A kind of optical fingerprint sensor mould group includes: light-emitting display panel；Light below light-emitting display panel
Learn sensor.Before the factory of optical fingerprint sensor mould group, the uniformity correction of image can be carried out to optical sensor, is improved
The performance of optical fingerprint sensor mould group.
However, the precision of the existing uniformity correction for carrying out image to optical sensor is poor.
Summary of the invention
Problems solved by the invention is to provide a kind of bearing calibration of optical fingerprint sensor mould group, to improve correction essence
Degree.
To solve the above problems, the present invention provides a kind of bearing calibration of optical fingerprint sensor mould group, comprising: provide light
Fingerprint sensor mould group is learned, the optical fingerprint sensor mould group includes: light-emitting display panel, the light-emitting display panel
Including light source region, the light source region includes the first sub-light source region to N sub-light source region, and N is the integer more than or equal to 2；Optics passes
Sensor, optical sensor include acquisition zone, and the acquisition zone is located at the light source region bottom, and the acquisition zone includes that the first son passes
Sensillary area is to the sub- sensing unit N, and the i-th sub-light source area is located at the surface of the i-th sub- sensing unit, and the i-th sub-light source region is sensed with the i-th son
The shape in area is consistent, and i is the integer more than or equal to 1 and less than or equal to N；The correction subgraph group of the first sub- sensing unit is obtained one by one
To the correction subgraph group of the sub- sensing unit N；The method for obtaining the correction subgraph group of the i-th sub- sensing unit include: light it is described
I-th sub-light source region；Obtain the correction subgraph group that the i-th sub- sensing unit is lit under state in the i-th sub-light source region；According to the first son
The correction subgraph group of sensing unit obtains the correction total figure of the optical sensor to the correction subgraph group of the sub- sensing unit N
As group.
Optionally, the correction subgraph group includes the first correction subgraph and the second correction subgraph；The correction is total
Image group includes the first correction total figure picture and the second correction total figure picture；Obtain the correction subgraph group of the first sub- sensing unit extremely one by one
The step of correction subgraph group of the sub- sensing unit N includes: to obtain the first of the first sub- sensing unit one by one to correct subgraph to N
First correction subgraph of sub- sensing unit；The second of the first sub- sensing unit is obtained one by one corrects subgraph to the sub- sensing unit N
Second correction subgraph；According to the correction subgraph group of the correction subgraph group of the first sub- sensing unit to the sub- sensing unit N, obtain
The method of the correction total figure picture group of the optical sensor includes: according to the first of the first sub- sensing unit the correction subgraph to N
First correction subgraph of sub- sensing unit obtains the first correction total figure picture of the optical sensor；According to the first sub- sensing unit
The second correction subgraph correct subgraph to the second of the sub- sensing unit N, the second correction for obtaining the optical sensor is total
Image.
Optionally, the method for obtaining the first correction subgraph of the i-th sub- sensing unit includes: to light the i-th sub-light source region；
In the case where the light source region is in the first shading environment, the i-th sub- sensing unit is obtained in the i-th sub-light source region and is lit first under state
Correct subgraph；The method for obtaining the second correction subgraph of the i-th sub- sensing unit includes: to light the i-th sub-light source region；Institute
It states light source region to be under the second shading environment, obtains the second correction that the i-th sub- sensing unit is lit under state in the i-th sub-light source region
Subgraph.
Optionally, first shading environment includes: that the light source region of the light-emitting display panel is hidden by black light-absorbing object
Gear；Second shading environment includes: that the light source region of the light-emitting display panel is blocked by yellowish pink reflective object.
Optionally, further includes: obtain the i-th attached light source region of the i-th sub-light source region, the i-th attached light source region is around the i-th sub-light source region
And with the i-th sub-light source region is seamless is connected；While lighting the i-th sub-light source region, the i-th attached light source region is lighted；It obtains
I-th sub- sensing unit is lit the correction subgraph group under state in the i-th sub-light source region and the i-th attached light source region.
Optionally, the area of the i-th attached light source region is the 20%~100% of the i-th sub-light source region area.
Optionally, the first sub- sensing unit to the sub- sensing unit N respectively includes several pixels；The optical fingerprint sensor
The bearing calibration of mould group further include: according to the correction total figure picture group of the optical sensor, obtain the correction system of optical sensor
Matrix number, the correction coefficient matrix include several correction coefficient, and each correction coefficient and each pixel correspond.
Optionally, further includes: after the correction total figure picture group for obtaining the optical sensor, obtain finger and shown in self-luminous
The finger pressing area of panel；Obtain the center position of the finger pressing area；The center position is obtained in optical sensing
Projected position on device；According to the projected position of the center position on the optical sensor, chosen in the acquisition zone
Collection apparatus area；According to the feature light source region of the position acquisition light-emitting display panel in collection apparatus area, the feature light source region
Positioned at the surface in the collection apparatus area, and the area of feature light source region is consistent with the area in the collection apparatus area；It lights
The feature light source region；It obtains collection apparatus area and is in the initial pictures under illuminating state in the feature light source region；According to institute
Correction total figure picture group and initial pictures are stated, the target correction image of the corresponding finger pressing area is obtained.
Optionally, further includes: obtain the attached light source region of feature of feature light source region, the attached light source region of feature is around the spy
Sign light source region and with the feature light source region is seamless is connected；While lighting the feature light source region, it is attached to light the feature
Light source region；It obtains collection apparatus area and is in the initial pictures under illuminating state in the feature light source region and the attached light source region of feature.
Optionally, the area of the attached light source region of the feature is the 20%~100% of feature light source region area.
Optionally, the shape of total figure of the feature light source region and the attached light source region of the feature is adopted different from the feature
The graphics shape of Ji Qu.
Optionally, the shape of total figure of the feature light source region and the attached light source region of the feature is circle, the feature
The graphics shape of acquisition zone is rectangle.
Optionally, the shape type of total figure of the feature light source region and the attached light source region of the feature, with the feature
The shape type of the figure of acquisition zone is consistent.
Optionally, the shape of total figure of the feature light source region and the attached light source region of the feature is rectangle, the feature
The shape of the figure of acquisition zone is rectangle.
Optionally, the edge shape of the acquisition zone is rectangle, and the first sub- sensing unit to the sub- sensing unit N is arranged in
The matrix of several row * several columns；The first sub-light source region is arranged in the matrix of several row * several columns to N sub-light source region.
Optionally, in the first sub- sensing unit into the sub- sensing unit N, two sub- sensing units of arbitrary neighborhood partly overlap.
Optionally, the area of sub- sensing unit partly overlapping for any two, overlapping region is more than or equal to 10% and small
In equal to the 1/2 of sub- sensing unit.
Compared with prior art, technical solution of the present invention has the advantage that
In the bearing calibration for the optical fingerprint sensor mould group that technical solution of the present invention provides, correction total figure picture group is according to the
The correction subgraph group of the correction subgraph group of one sub- sensing unit to the sub- sensing unit N obtains.Since each sub- sensing unit is corresponding
The area of each sub-light source region is smaller, and the area of practical pressing finger and the local light source lighted when acquiring image relatively connects
Closely.Therefore, in identical position, the brightness of used light source when correction total figure picture group is generated, and uses the user fingerprints current political situation
The similar brightness for the light source that portion lights, luminance difference is within 20%.When user presses finger collection image in this way, after correction
The case where fingerprint image is not in distortion, so that fingerprint image understands.To sum up, correction accuracy is improved.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of optical fingerprint sensor mould group；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the flow chart of optical fingerprint sensor mould group correction course in one embodiment of the invention；
Fig. 4 to Figure 12 is the structural schematic diagram of optical fingerprint sensor mould group correction course in one embodiment of the invention.
Specific embodiment
As described in background, the performance for the semiconductor devices that the prior art is formed is poor.
A kind of optical fingerprint sensor mould group, with reference to Fig. 1, comprising: light-emitting display panel 100；It is shown positioned at self-luminous
The optical sensor 120 of 100 lower section of panel；Light between light-emitting display panel 100 and optical sensor 120 collimates layer
130；The first optical cement 141 between light-emitting display panel 100 and light collimation layer 130；Positioned at 120 He of optical sensor
Light collimates the second optical cement 142 between layer 130.First optical cement 141 is for pasting light-emitting display panel 100 and light
Layer 130 is collimated, the second optical cement 142 is for pasting optical sensor 120 and light collimation layer 130.First optical cement 141 and second
Optical cement 142 is transmissive to the light (400nm-700nm) of the sending of light-emitting display panel 100.
When optical sensor 120 acquires fingerprint, the reflected light of the fingerprint press surface of light-emitting display panel 100 need across
Light-emitting display panel 100, light collimation layer 130 and the first optical cement 141 and the second optical cement 142.
Since the first optical cement 141 and the second optical cement 142 are not ideal uniform dielectric, the first optical cement
141 can be variant in the photopermeabilities of different zones, and the second optical cement 142 can be variant in the photopermeability of different zones.From
Light emitting display panel 100 is also not uniform-light transmission, and the photopermeability of different zones has difference in light-emitting display panel 100
It is different.Secondly as the luminescent properties of each light emitting pixel are also variant in light-emitting display panel 100, and again, optical sensor
The photosensitive property of each pixel is also all variant in 120.Above-mentioned factor can all cause optical sensor 120 in acquisition fingerprint image
In the process, the photosignal that each pixel receives is uneven, eventually occurs speck or moire fringes etc. in fingerprint image, seriously
Influence fingerprint clear degree.
In order to eliminate acquisition fingerprint image during photosignal it is uneven, dispatch from the factory it in optical fingerprint sensor mould group
Before, the uniformity correction of image can be carried out to optical sensor 120, it is uneven to eliminate this photosignal.
A kind of bearing calibration includes: the light source region for lighting light-emitting display panel 100, and in the light-emitting display panel
100 light source region by dark shade it is light-blocking in the case where, optical sensor 120 acquisition first correction image a (x, y), a indicate
Signal value, (x, y) indicate position coordinates；The light source region of light-emitting display panel 100 is lighted, and in the light-emitting display panel
When 100 light source region is by yellowish pink reflective object, second correction image b (x, y) of the acquisition of optical sensor 120, b indicates signal value, (x,
Y) position coordinates are indicated；According to first correction image a (x, y) and second correct image b (x, y) obtain correction coefficient matrix c (x,
Y), the correction coefficient matrix c (x, y) includes several correction coefficient, each pixel of each correction coefficient and the optical sensor
It corresponds.
It is subsequent first to light the light source region of light-emitting display panel 100 in user's actual acquisition fingerprint, institute is pressed in finger
In the case where stating light-emitting display panel 100, optical sensor 120 acquires initial pictures, corrects image a (x, y) according to first,
Second correction image b (x, y), correction coefficient matrix c (x, y) and initial pictures, obtain final fingerprint image d (x, y).
In correction course, for the accuracy of correction, need to guarantee to correct image a (x, y), the second school in acquisition first
When the initial pictures of positive image b (x, y) and user fingerprints, the brightness of the light source region of light-emitting display panel 100 is adopted three times at this
Change smaller between collection process, difference is within 20%.Secondly, need to guarantee the light source region of light-emitting display panel 100
Any one color, changes smaller between this is acquired three times, and difference is within 10%.Otherwise the standard of correction result is influenced
True property, fingerprint image still can have the non-uniform phenomenons such as speck or moire fringes, and fingerprint image is unclear.
With reference to Fig. 2, for the optical sensor 120 of small area, the area of optical sensor 120 is slightly less than self-luminous and shows
The light source region of panel 100, finger pressing area are slightly larger than the light source region of light-emitting display panel 100.Image a is corrected in acquisition first
(x, y), second correction image b (x, y) and user fingerprints initial pictures when, the light source region of light-emitting display panel 100 it is whole
A region is all lit, and when this is acquired three times, the brightness of light source region is almost the same.
For example, correcting the initial pictures of image a (x, y), the second correction image b (x, y) and user fingerprints in acquisition first
When, each pixel in the light source region of light-emitting display panel 100 is all white (R:255, G:255, B:255).In this way.Due to adopting every time
The area that light source region is lighted when collection is the same, so light source region is almost the same, difference in the light emission luminance of collection process three times
It is smaller, it can generally control within 20%.
However, the gross area of optical sensor acquisition zone is big as the area of the acquisition zone of optical sensor about comes bigger
In the pressing area of a finger, correspondingly, the light source region due to light-emitting display panel is generally slightly larger than optical sensor
Area, therefore the light source region of light-emitting display panel also accordingly becomes larger.Since light-emitting display panel 100 passes through driving IC driving
Each display pixel shines, and the power and ground in the circuit of light-emitting display panel 100 has resistance, therefore the driving
When IC drives same picture, the area of light source region is bigger, and the pressure drop of power supply line will be bigger, and the pressure drop of ground wire will be bigger.
That is, in one case, in light source region each light emitting pixel be all arranged same white picture (R:255, G:255, B:
255) when, the average brightness as the light source region area lighted very big (such as 50mm*50mm) is than when the light source region area lighted
Average brightness when very little (such as 10mm*10mm) wants small.
In the case, acquisition first correct image a (x, y) and second correction image b (x, y) when, light it is entire oneself
The light source region (such as 50mm*50mm) of light emitting display panel 100, each pixel in light source region be all white (R:255, G:255, B:
255), since the area that light source region is lit at this time is larger, the pressure drop of power supply line is with regard to larger, and the pressure drop of ground wire is with regard to larger, light source
The average brightness that area is lit region is smaller.And when actual acquisition user fingerprints, it can only light some zonule of light source region
(such as 10mm*10mm), each pixel that light source region is lit region is all white (R:255, G:255, B:255), due at this time
The area that light source region is lit is smaller, and the pressure drop of power supply line is just smaller, and the pressure drop of ground wire is just smaller, and light source region is lit region
Average brightness is larger.So in light source region same position, acquisition first correct image a (x, y) and second correct image b (x,
Brightness when y) and differing greatly between the brightness when acquiring user fingerprints are greater than 20%, therefore lead to fingerprint image
Correction failure, image fault.
On this basis, the present invention provides a kind of optical fingerprint sensor mould group bearing calibration, with reference to Fig. 3, including it is following
Step:
S01: providing optical fingerprint sensor mould group, and the optical fingerprint sensor mould group includes: light-emitting display panel,
The light-emitting display panel includes light source region, and the light source region includes the first sub-light source region to N sub-light source region, N be greater than
Integer equal to 2；Optical sensor, optical sensor include acquisition zone, and the acquisition zone is located at the light source region bottom, described
Acquisition zone includes the first sub- sensing unit to the sub- sensing unit N, and the i-th sub-light source area is located at the surface of the i-th sub- sensing unit, and i-th
Sub-light source region is consistent with the shape of the i-th sub- sensing unit, and i is the integer more than or equal to 1 and less than or equal to N；
S02: the correction subgraph group of the first sub- sensing unit is obtained one by one to the correction subgraph group of the sub- sensing unit N；It obtains
The method for taking the correction subgraph group of the i-th sub- sensing unit includes: to light the i-th sub-light source region；The i-th sub- sensing unit is obtained
I sub-light source region is lit the correction subgraph group under state；
S03: according to the correction subgraph group of the correction subgraph group of the first sub- sensing unit to the sub- sensing unit N, institute is obtained
State the correction total figure picture group of optical sensor.
The method improves correction accuracy.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Fig. 4 to Figure 12 is the structural schematic diagram of optical fingerprint sensor mould group correction course in one embodiment of the invention.
In conjunction with reference Fig. 4 and Fig. 5, Fig. 5 is the top view of Fig. 4, provides optical fingerprint sensor mould group, the optical finger print
Sensor module includes: light-emitting display panel 200, and the light-emitting display panel 200 includes light source region A；Optical sensor
210, optical sensor 210 includes acquisition zone B, and the acquisition zone B is located at the bottom of the light source region A.
The acquisition zone B is referred to: the overall area that each pixel occupies in optical sensor 210.
The light source region A is slightly larger than the acquisition zone B.
The optical fingerprint sensor mould group further include: between light-emitting display panel 200 and optical sensor 210
Light collimate layer 220；Between light-emitting display panel 200 and light collimation layer 220 and optical sensor 210 and light are quasi-
Optical cement 240 between straight layer 220.
The optical cement 240 is transmissive to the light (400nm-700nm) that the light source region A of light-emitting display panel 200 is issued.
In other embodiments, the optical fingerprint sensor mould group does not include light collimation layer.Optical cement directly will be spontaneous
Light display panel 200 and optical sensor 210 are pasted.
In the present embodiment, bonded using between optical sensor 210 and light collimation layer 220 with optical cement 240, it can
Yield is improved, specifically, an appearance is abnormal in optical sensor 210 or light collimation layer 130, is glued again then can do over again
It closes, specifically, for example, when exception occurs in light collimation layer 130, then can be quasi- in the new light of 210 surface bonding of optical sensor
Straight layer avoids optical sensor 210 from scrapping.
In other embodiments, light collimation layer is directly produced on the upper surface of optical sensor, the optical sensing described in this way
There is no optical cement between device 210 and light collimation layer 220, so that image effect can mention promotion.
With reference to Fig. 6, the acquisition zone B includes the first sub- sensing unit 211 to sub- sensing unit N, and N is whole more than or equal to 2
Number.
The first sub- sensing unit 211 to sub- sensing unit N is shown in Fig. 6, has only indicated the first sub- sensing unit 211.
In the present embodiment, the edge shape of the acquisition zone B is rectangle, and the first sub- sensing unit 211 to N senses
Area is arranged in the matrix of several row * several columns, and the shape of the first sub- sensing unit 211 to sub- sensing unit N is rectangle.This implementation
Example in, the first sub- sensing unit to the sub- sensing unit N it is in the same size.
In other embodiments, without limitation to the shape of the first sub- sensing unit 211 to sub- sensing unit N.
In other embodiments, the big fraction of the first sub- sensing unit to sub- sensing unit N is different, alternatively, the first son
The size of sensing unit to the sub- sensing unit N is different.
With reference to Fig. 7, the light source region A of the light-emitting display panel 200 includes the first sub-light source region 212 to N sub-light source
Area, the i-th sub-light source area is located at the surface of the i-th sub- sensing unit, and the i-th sub-light source region is consistent with the shape of the i-th sub- sensing unit, i
For the integer more than or equal to 1 and less than or equal to N.
The first sub-light source region 212 is shown in Fig. 7 to the sub- sensing unit N, has only indicated the first sub-light source region 212.
In the present embodiment, the shape of the light source region A of light-emitting display panel 200 is rectangle, the first sub-light source region 212
The matrix of several row * several columns is arranged in N sub-light source region, the shape of the first sub-light source region 212 to N sub-light source region is
Rectangle.In the present embodiment, the first sub-light source region to N sub-light source region it is in the same size.
In other embodiments, without limitation to the shape of the first sub-light source region 212 to N sub-light source region.
In other embodiments, different to the big fraction of the first sub-light source region to N sub-light source region, alternatively, first
The size of sub-light source region to N sub-light source region is different.
I-th sub-light source region is identical with the shape of the i-th sub- sensing unit and area is identical, and the center of the i-th sub-light source region
The position being projected on the i-th sub- sensing unit is suitable for and the center of the i-th sub- sensing unit is overlapped.
When optical sensor 210 and the contraposition of light-emitting display panel 200 do not have deviation, the i-th sub-light source region is in light
The projecting figure and the i-th sub- sensing unit for learning 210 surface of sensor are completely coincident.
In the present embodiment, further includes: obtain the i-th attached light source region of the i-th sub-light source region, the i-th attached light source region is around the i-th sub-light
Source region and with the i-th sub-light source region is seamless is connected, the i-th attached light source region is the part of the sub- sensing unit around the i-th sub-light source region
Region, so that: the gross area of the i-th sub-light source region and the i-th attached light source region is greater than the area of the i-th sub- sensing unit.
Since the gross area of the i-th sub-light source region and the i-th attached light source region is greater than the area of the i-th sub- sensing unit, can protect
For card in the whole region of the i-th sub- sensing unit, the difference for the optical signal that each place receives is little, avoids the i-th sub- sensing unit
The optical signal that boundary and each pixel of central point are received is widely different, convenient for subsequent each sub- sensing unit image mosaic at
Complete total figure picture.
In one embodiment, the area of the i-th attached light source region is the 20%~100% of the i-th sub-light source region area.
In one embodiment, in the overall area of the i-th sub-light source region and the i-th attached light source region, luminance difference everywhere is controlled
It is thus smaller come the optical signal difference that guarantees that the i-th place sub- sensing unit Nei Ge receives within 20%, it is better to reach
Fingerprint image uniformity.
Then, the correction subgraph group of the first sub- sensing unit is obtained one by one to the correction subgraph group of the sub- sensing unit N；It obtains
The method for taking the correction subgraph group of the i-th sub- sensing unit includes: to light the i-th sub-light source region；The i-th sub- sensing unit is obtained
I sub-light source region is lit the correction subgraph group under state.
In the present embodiment, the correction subgraph group includes the first correction subgraph and the second correction subgraph；The school
Positive total figure picture group includes the first correction total figure picture and the second correction total figure picture.
One by one obtain the first sub- sensing unit correction subgraph group to the sub- sensing unit N correction subgraph group the step of wrap
It includes: obtaining the first correction subgraph of the first sub- sensing unit one by one to the first correction subgraph of the sub- sensing unit N；It obtains one by one
The second of first sub- sensing unit corrects the second correction subgraph of subgraph to the sub- sensing unit N.
With reference to Fig. 8, the first correction subgraph a of the first sub- sensing unit 211 is obtained one by one1(x, y) is to the sub- sensing unit N
First correction subgraph aN(x, y).
First correction subgraph a of the i-th sub- sensing unitiIn (x, y), aiIndicate that signal value, (x, y) indicate position coordinates, i
For the integer more than or equal to 1 and less than or equal to N.
Obtain the first correction subgraph a of the i-th sub- sensing unitiThe method of (x, y) includes: to light the i-th sub-light source region；
In the case where the light source region A of the light-emitting display panel 200 is in the first shading environment, the i-th sub- sensing unit is obtained in the i-th sub-light source
Area is lit the first correction subgraph a under statei(x, y).
First shading environment includes: that the light source region A of the light-emitting display panel 200 is blocked by black light-absorbing object,
Environment light is avoided to enter optical sensor 210, black light-absorbing object can absorb that 200 overwhelming majority of light-emitting display panel is outside to be gone out
Penetrate light.
In the present embodiment, obtains in the method for the first correction subgraph of the i-th sub- sensing unit, lighting i-th sub-light
While source region, the i-th attached light source region is lighted；The i-th son is obtained in the case where the i-th sub-light source region and the i-th attached light source region are lit state to pass
First correction subgraph a of sensillary areai(x, y), in the process, in addition to the i-th sub-light source region and the i-th attached light source region in light source region
Other regions are non-lit up.
In other embodiments, it obtains in the method for the first correction subgraph of the i-th sub- sensing unit, is only lighted in light source region
The i-th sub-light source region.
With reference to Fig. 9, the second correction subgraph b of the first sub- sensing unit 211 is obtained one by one1(x, y) is to the sub- sensing unit N
Second correction subgraph bN(x, y).
Second correction subgraph b of the i-th sub- sensing unitiIn (x, y), biIndicate that signal value, (x, y) indicate position coordinates, i
For the integer more than or equal to 1 and less than or equal to N.
The method for obtaining the second correction subgraph of the i-th sub- sensing unit includes: to light the i-th sub-light source region；Described
The light source region of light-emitting display panel is under the second shading environment, is obtained the i-th sub- sensing unit in the i-th sub-light source region and is lit shape
The second correction subgraph b under statei(x, y).
Second shading environment includes: that the light source region A of the light-emitting display panel 200 is blocked by yellowish pink reflective object,
Environment light is avoided to enter optical sensor 210, yellowish pink reflective object can reflect the emergent light of light-emitting display panel 200, reflected light
Optical sensor 210 can be entered across light-emitting display panel 200 and light collimation layer 220.In the second shading environment, institute
To block the light source region A of light-emitting display panel 200 with yellowish pink reflective object, when being to simulate manpower pressing acquisition fingerprint
Light reflection case.
In the present embodiment, in the second correction subgraph b for obtaining the i-th sub- sensing unitiIn the method for (x, y), further includes:
While lighting the i-th sub-light source region, the i-th attached light source region is lighted；Shape is lit in the i-th sub-light source region and the i-th attached light source region
The second correction subgraph b of the i-th sub- sensing unit is obtained under statei(x, y), in the process, in addition to the i-th sub-light source region in light source region
It is non-lit up with other regions of the i-th attached light source region.
In the present embodiment, after lighting the i-th sub-light source region and the i-th attached light source region, in the i-th sub-light source region and i-th
In the overall area of attached light source region, brightness throughout difference is less than or equal to 20%.
In other embodiments, in the method for the second correction subgraph for obtaining the i-th sub- sensing unit, only point in light source region
The bright i-th sub-light source region, correspondingly, after lighting the i-th sub-light source region, in the i-th sub-light source region, luminance difference is less than etc.
In 20%.
Then, according to the correction subgraph group of the correction subgraph group of the first sub- sensing unit to the sub- sensing unit N；According to
The correction subgraph group of one sub- sensing unit obtains the correction of the optical sensor to the correction subgraph group of the sub- sensing unit N
The method of total figure picture group includes: the first syndrome according to the first of the first sub- sensing unit the correction subgraph to the sub- sensing unit N
Image obtains the first correction total figure picture of the optical sensor；According to the second of the first sub- sensing unit the correction subgraph to N
Second correction subgraph of sub- sensing unit obtains the second correction total figure picture of the optical sensor.
With reference to Figure 10, according to the first of the first sub- sensing unit 211 the correction subgraph a1(x, y) is to the of the sub- sensing unit N
One correction subgraph aN(x, y) obtains the first correction total figure of the optical sensor 210 as K (x, y).
In the present embodiment, specifically, correcting subgraph a for the first of the first sub- sensing unit 2111(x, y) to N sense
The first correction subgraph a in areaN(x, y) is spliced into the first correction total figure as K (x, y).
With reference to Figure 11, according to the second of the first sub- sensing unit 211 the correction subgraph b1(x, y) is to the of the sub- sensing unit N
Second revisal positive sub-image bN(x, y) obtains the second correction total figure of the optical sensor 210 as L (x, y).
In the present embodiment, specifically, correcting subgraph b for the second of the first sub- sensing unit 2111(x, y) to N sense
The second correction subgraph b in areaN(x, y) is spliced into the second correction total figure as L (x, y).
First sub- sensing unit 211 to the sub- sensing unit N respectively includes several pixels.The optical fingerprint sensor mould group
Bearing calibration further include: according to the correction total figure picture group of the optical sensor 210, obtain the correction coefficient of optical sensor
Matrix M (x, y), the correction coefficient matrix M (x, y) include several correction coefficient, and each correction coefficient and each pixel one are a pair of
It answers, specifically, according to the first of the optical sensor 210 the correction total figure as K (x, y) and second corrects total figure as L (x, y),
Obtain the correction coefficient matrix M (x, y) of optical sensor 210.
Before the factory of optical fingerprint sensor mould group, by the first correction total figure as K (x, y), the second correction total figure are as L
(x, y) and correction coefficient matrix M (x, y) are stored in optical fingerprint sensor mould group.
With reference to Figure 12, finger is obtained in the finger pressing area of light-emitting display panel 200；Obtain the finger pressing area
Center position；Obtain the projected position of the center position on the optical sensor；According to the center position in light
Learn the projected position on sensor, the selected characteristic acquisition zone C in the acquisition zone；According to the position acquisition of collection apparatus area C
The feature light source region of light-emitting display panel 200, the feature light source region are located at the surface of the collection apparatus area C, and special
The area for levying light source region is consistent with the area of the collection apparatus area C；Light the feature light source region；Obtain collection apparatus area C
The initial pictures t (x, y) under illuminating state is in the feature light source region；According to the correction total figure picture group and initial pictures
T (x, y) obtains the target correction image d (x, y) of the corresponding finger pressing area.
In one embodiment, according to the first correction total figure as K (x, y), the second correction total figure are as L (x, y), correction coefficient
Matrix M (x, y) and initial pictures t (x, y) obtains the target correction image d (x, y) of the corresponding finger pressing area.Specifically,
In the first correction total figure as obtaining fisrt feature correction image a ' (x, y) at the location of C of character pair acquisition zone in K (x, y),
Second correction total figure corrects image b ' (x, y) as obtaining the second feature at the location of C of character pair acquisition zone in L (x, y), in school
The feature coefficient matrix c ' (x, y) at the location of C of character pair acquisition zone is obtained in positive coefficient matrix M (x, y), according to fisrt feature
Correct image a ' (x, y), second feature correction image b ' (x, y), feature coefficient matrix c ' (x, y) and initial pictures t (x,
Y), target correction image d (x, y) is obtained.
In other embodiments, correction coefficient matrix M can not depended on during obtaining target correction image d (x, y)
(x, y), according to the first correction total figure as K (x, y), the second correction total figure are as L (x, y) and initial pictures t (x, y), acquisition correspondence
The target correction image d (x, y) of the finger pressing area, specifically, in the first correction total figure as the corresponding spy of acquisition in K (x, y)
It levies the fisrt feature at the location of C of acquisition zone and corrects image a ' (x, y), in the second correction total figure as acquisition character pair in L (x, y)
Second feature at the location of C of acquisition zone corrects image b ' (x, y), corrects image a ' (x, y), second feature school according to fisrt feature
Positive image b ' (x, y) and initial pictures t (x, y) is obtained target correction image d (x, y).
Target correction image d (x, y) is referred to: the fingerprint image of 210 final output of optical sensor.
In the present embodiment, further includes: obtain the attached light source region of feature of feature light source region, the attached light source region of feature is around institute
State feature light source region and with the feature light source region is seamless is connected, the attached light source region of feature is around the feature light source region
The partial region of light source region；While lighting the feature light source region, the attached light source region of the feature is lighted；Obtain collection apparatus
Area C is in the initial pictures t (x, y) under illuminating state, in the process, point in the feature light source region and the attached light source region of feature
Bright area (referring to Figure 12) includes feature light source region and the attached light source region of feature, removes feature light source region and the attached light source of feature in light source region
Region except area is non-lit up.
The area of the attached light source region of feature is the 20%~100% of feature light source region area.
In the present embodiment, after lighting the feature light source region and the attached light source region of feature, in the attached light source region of the feature and institute
In the overall area for stating feature light source region, luminance difference is less than or equal to 20%.
In other embodiments, during initial pictures, the feature light source region in light source region is only lighted, in characteristic light
In source region, luminance difference is less than or equal to 20%.
In the present embodiment, the shape of total figure of the feature light source region and the attached light source region of the feature is different from the spy
The graphics shape of acquisition zone is levied, such as: the shape of total figure of the feature light source region and the attached light source region of the feature is circle,
The graphics shape in the collection apparatus area is rectangle.
In other embodiments, the shape type of total figure of the feature light source region and the attached light source region of the feature, with
The shape type of the figure in the collection apparatus area is consistent, for example, the feature light source region and the attached light source region of the feature is total
The shape of figure is rectangle (including round rectangle), and the shape of the figure in the collection apparatus area is rectangle (including fillet square
Shape).
Another embodiment of the present invention also provides a kind of optical fingerprint sensor mould group bearing calibration, the present embodiment and previous reality
The difference for applying example is: in the first sub- sensing unit into the sub- sensing unit N, two sub- sensing units of arbitrary neighborhood partly overlap.
Two sub- sensing units of arbitrary neighborhood refer to: two adjacent sub- sensing units in position.
In one embodiment, the first sub- sensing unit and the second sub- sensing unit partly overlap, the second sub- sensing unit and third
Sub- sensing unit partly overlaps.
In the first sub- sensing unit into the sub- sensing unit N, two sub- sensing units of arbitrary neighborhood partly overlap, thus more preferably
Ground reduces the image difference of the sub- sensing unit boundary of adjacent two.
Correspondingly, two sub- light source regions of arbitrary neighborhood partly overlap in the first sub-light source region into N sub-light source region,
Position of the central projection of the i-th sub-light source region on the i-th sub- sensing unit is overlapped with the center of the i-th sub- sensing unit, i be greater than
Integer equal to 1 and less than or equal to N.
In a specific embodiment, sub- sensing unit partly overlapping for any two, the area of overlapping region are big
In 1/2 equal to 10% and less than or equal to any sub- sensing unit, the meaning of this range is: if overlapping region is too small, causing
The border-differential of each sub- sensing unit cannot be eliminated well；If overlapping region is too big, the number of sub- sensing unit just will increase, greatly
The big acquisition time for increasing the first correction total figure picture and the second correction total figure picture.
Acquisition first correct total figure as when, sub- sensing unit partly overlapping for any two, the correction of overlapping region
Image is average value of each sub- sensing unit in the correction image of overlapping region.
In the present embodiment, in identical position, the brightness of used light source when correction total figure picture group is generated, and using use
The similar brightness for the light source locally lighted when the fingerprint of family, luminance difference is within 20%.User presses finger collection image in this way
When, the case where fingerprint image after correction is not in distortion, so that fingerprint image understands.
It closes in this present embodiment with content identical in previous embodiment, be not described in detail.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (17)
1. a kind of bearing calibration of optical fingerprint sensor mould group characterized by comprising
Optical fingerprint sensor mould group is provided, the optical fingerprint sensor mould group includes: light-emitting display panel, described spontaneous
Light display panel includes light source region, and the light source region includes the first sub-light source region to N sub-light source region, and N is whole more than or equal to 2
Number；Optical sensor, optical sensor include acquisition zone, and the acquisition zone is located at the light source region bottom, the acquisition zone packet
The first sub- sensing unit to the sub- sensing unit N is included, the i-th sub-light source area is located at the surface of the i-th sub- sensing unit, and the i-th sub-light source region
Consistent with the shape of the i-th sub- sensing unit, i is the integer more than or equal to 1 and less than or equal to N；
The correction subgraph group of the first sub- sensing unit is obtained one by one to the correction subgraph group of the sub- sensing unit N；The i-th son is obtained to pass
The method of the correction subgraph group of sensillary area includes: to light the i-th sub-light source region；The i-th sub- sensing unit is obtained in the i-th sub-light source region
The correction subgraph group being lit under state；
According to the correction subgraph group of the correction subgraph group of the first sub- sensing unit to the sub- sensing unit N, obtains the optics and pass
The correction total figure picture group of sensor.
2. the bearing calibration of optical fingerprint sensor mould group according to claim 1, which is characterized in that the correction subgraph
As group includes the first correction subgraph and the second correction subgraph；The correction total figure picture group includes the first correction total figure picture and the
Two correction total figure pictures；
One by one obtain the first sub- sensing unit correction subgraph group to the sub- sensing unit N correction subgraph group the step of include:
The first correction subgraph of the first sub- sensing unit is obtained one by one to the first correction subgraph of the sub- sensing unit N；Is obtained one by one
The second of one sub- sensing unit corrects the second correction subgraph of subgraph to the sub- sensing unit N；
According to the correction subgraph group of the correction subgraph group of the first sub- sensing unit to the sub- sensing unit N, obtains the optics and pass
The method of the correction total figure picture group of sensor includes: according to the first of the first sub- sensing unit the correction subgraph to the sub- sensing unit N
First correction subgraph obtains the first correction total figure picture of the optical sensor；According to the second of the first sub- sensing unit the correction
Subgraph obtains the second correction total figure picture of the optical sensor to the second correction subgraph of the sub- sensing unit N.
3. the bearing calibration of optical fingerprint sensor mould group according to claim 2, which is characterized in that obtain the i-th son and pass
The method of first correction subgraph of sensillary area includes: to light the i-th sub-light source region；The first shade is in the light source region
Under border, the first correction subgraph that the i-th sub- sensing unit is lit under state in the i-th sub-light source region is obtained；
The method for obtaining the second correction subgraph of the i-th sub- sensing unit includes: to light the i-th sub-light source region；In the light source
Area is under the second shading environment, obtains the second correction subgraph that the i-th sub- sensing unit is lit under state in the i-th sub-light source region
Picture.
4. the bearing calibration of optical fingerprint sensor mould group according to claim 3, which is characterized in that first shading
Environment includes: that the light source region of the light-emitting display panel is blocked by black light-absorbing object；Second shading environment includes: described
It is blocked by yellowish pink reflective object the light source region of light-emitting display panel.
5. the bearing calibration of optical fingerprint sensor mould group according to claim 1, which is characterized in that further include: it obtains
I-th attached light source region of the i-th sub-light source region, the i-th attached light source region around the i-th sub-light source region and with the seamless phase of the i-th sub-light source region
Even；While lighting the i-th sub-light source region, the i-th attached light source region is lighted；Obtain the i-th sub- sensing unit in the i-th sub-light source region and
I-th attached light source region is lit the correction subgraph group under state.
6. the bearing calibration of optical fingerprint sensor mould group according to claim 5, which is characterized in that the i-th attached light source region
Area be the i-th sub-light source region area 20%~100%.
7. the bearing calibration of optical fingerprint sensor mould group according to claim 1, which is characterized in that the first sub- sensing unit
Several pixels are respectively included to the sub- sensing unit N；
The bearing calibration of the optical fingerprint sensor mould group further include: according to the correction total figure picture group of the optical sensor,
Obtain the correction coefficient matrix of optical sensor, the correction coefficient matrix includes several correction coefficient, each correction coefficient and
Each pixel corresponds.
8. the bearing calibration of optical fingerprint sensor mould group according to claim 1, which is characterized in that further include: it obtains
After the correction total figure picture group of the optical sensor, finger is obtained in the finger pressing area of light-emitting display panel；Described in acquisition
The center position of finger pressing area；Obtain the projected position of the center position on the optical sensor；In described
The projected position of heart point position on the optical sensor, the selected characteristic acquisition zone in the acquisition zone；According to collection apparatus area
Position acquisition light-emitting display panel feature light source region, the feature light source region be located at the collection apparatus area just on
Side, and the area of feature light source region is consistent with the area in the collection apparatus area；Light the feature light source region；Feature is obtained to adopt
Ji Qu is in the initial pictures under illuminating state in the feature light source region；According to the correction total figure picture group and initial pictures,
Obtain the target correction image of the corresponding finger pressing area.
9. the bearing calibration of optical fingerprint sensor mould group according to claim 8, which is characterized in that further include: it obtains
The attached light source region of the feature of feature light source region, the attached light source region of feature around the feature light source region and with the feature light source region
It is seamless to be connected；While lighting the feature light source region, the attached light source region of the feature is lighted；Collection apparatus area is obtained described
Feature light source region and the attached light source region of feature are in the initial pictures under illuminating state.
10. the bearing calibration of optical fingerprint sensor mould group according to claim 9, which is characterized in that the feature is attached
The area of light source region is the 20%~100% of feature light source region area.
11. the bearing calibration of optical fingerprint sensor mould group according to claim 9, which is characterized in that the characteristic light
The shape of total figure of source region and the attached light source region of the feature is different from the graphics shape in the collection apparatus area.
12. the bearing calibration of optical fingerprint sensor mould group according to claim 11, which is characterized in that the characteristic light
The shape of total figure of source region and the attached light source region of the feature is circle, and the graphics shape in the collection apparatus area is rectangle.
13. the bearing calibration of optical fingerprint sensor mould group according to claim 9, which is characterized in that the characteristic light
The shape type of total figure of source region and the attached light source region of the feature, the shape type one with the figure in the collection apparatus area
It causes.
14. the bearing calibration of optical fingerprint sensor mould group according to claim 13, which is characterized in that the characteristic light
The shape of total figure of source region and the attached light source region of the feature is rectangle, and the shape of the figure in the collection apparatus area is rectangle.
15. the bearing calibration of optical fingerprint sensor mould group according to claim 1, which is characterized in that the acquisition zone
Edge shape be rectangle, the first sub- sensing unit is arranged in the matrix of several row * several columns to the sub- sensing unit N；It is described
First sub-light source region is arranged in the matrix of several row * several columns to N sub-light source region.
16. the bearing calibration of optical fingerprint sensor mould group according to claim 1, which is characterized in that passed in the first son
Into the sub- sensing unit N, two sub- sensing units of arbitrary neighborhood partly overlap sensillary area.
17. the bearing calibration of optical fingerprint sensor mould group according to claim 16, which is characterized in that for any two
A partly overlapping sub- sensing unit, the area of overlapping region are more than or equal to 10% and are less than or equal to the 1/2 of sub- sensing unit.
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