CN109993144A - Optical finger print recognizer component and electronic equipment - Google Patents
Optical finger print recognizer component and electronic equipment Download PDFInfo
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- CN109993144A CN109993144A CN201910286341.2A CN201910286341A CN109993144A CN 109993144 A CN109993144 A CN 109993144A CN 201910286341 A CN201910286341 A CN 201910286341A CN 109993144 A CN109993144 A CN 109993144A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- 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
- G06V40/1365—Matching; Classification
- G06V40/1376—Matching features related to ridge properties or fingerprint texture
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Abstract
The present invention provides a kind of optical finger print recognizer component and electronic equipments, the optical finger print recognizer component includes substrate, photosensor layer and optical structure layers, wherein optical structure layers include the first structure layer and the second structure sheaf to fit, the refractive index of first structure layer is greater than the refractive index of the second structure sheaf, optical structure layers can screen the light by fingerprint ridge and fingerprint valley incidence, the light for stopping incidence angle to be greater than or equal to preset angle enters the second structure sheaf, distinguish fingerprint ridge and the light of fingerprint valley incidence, so that the amount of light that photosensitive element receives fingerprint valley incidence is more than fingerprint ridge, to obtain light and dark fingerprint image, to carry out fingerprint recognition.Under strong light environment, optical structure layers can effectively utilize the increased light of quantity, increase the light and shade difference of the fingerprint valley formed on photosensitive element and fingerprint ridge image, to make light and dark fingerprint image be more clear, to obtain the fingerprint image of high quality, guarantee the accuracy and validity of fingerprint recognition under strong light environment.
Description
Technical field
The present invention relates to field of display technology, in particular to a kind of optical finger print recognizer component and electronic equipment.
Background technique
Fingerprint is the series of ridges and Gu Zucheng by being located at finger tip skin surface, is an only nothing for everyone
Two.It with the development of fingerprint identification technology, is widely used in numerous areas, such as the hand in electronic device terminal
Machine, tablet computer and intelligent wearable device etc.；Gate inhibition and safety cabinet in security protection system etc..User is in operation with finger
Before the display device of line identification function, the specific region of finger touch display unit need to be only used, the knowledge of fingerprint identification unit is passed through
Authority Verification can not be carried out, while simplifying Authority Verification, improves the safety of verifying.
Fingerprint recognition can be divided into light sensation fingerprint recognition, capacitance type fingerprint identification and ultrasonic fingerprint according to its working principle
Identification.For light sensation fingerprint recognition, the light intensity that the received fingerprint ridge of fingerprint identification unit and fingerprint valley reflect is different, so that
The reflected light that is formed at fingerprint ridge position and the current/voltage signal magnitude that is converted into of reflected light formed in fingerprint valley are not
Together, to form light and dark fingerprint image according to the difference of paddy spinal reflex rate, to realize the identification of fingerprint.
But under strong light environment, it will receive a large amount of stronger light around finger using the reflected light imaging of fingerprint valley ridge
Interference, so that the case where overexposure occurs in collected fingerprint image, influences the accuracy of fingerprint recognition.
Summary of the invention
It is an object of the invention to solve to utilize fingerprint valley in the optical finger print recognizer component and electronic equipment of the prior art
The reflected light imaging of ridge will receive the interference of strong light around finger, so that there is the case where overexposure in collected fingerprint image,
The problem of influencing the accuracy of fingerprint recognition.
In order to solve the above technical problems, the present invention provides a kind of optical finger print recognizer component comprising substrate, optical sensor
The surface of the substrate is arranged in layer and optical structure layers, photosensor layer, and the photosensor layer includes that multiple arrays are set
The photosensitive pixel set；The side that the photosensor layer deviates from the substrate is arranged in optical structure layers；The optical structure layers
Including the first structure layer and the second structure sheaf to fit, the refractive index of the first structure layer is greater than second structure sheaf
Refractive index；Wherein, light is reflected into the optical structure layers through target fingerprint, and the optical structure layers are for stopping incidence angle
Enter second structure sheaf greater than the light refraction of preset angle so that the light that is reflected in the first structure layer or
The light reflected in second structure sheaf is received by the photosensitive pixel, and forms fingerprint image；The incidence angle
It is described default for the light direction of propagation and perpendicular to the angle of the first structure layer and the second structure sheaf interface direction
Angle is the critical angle that light is entered that second structure sheaf is totally reflected by the first structure layer.
The application also provides a kind of electronic equipment, shell and the mainboard that the enclosure interior is arranged in, and the electronics is set
Standby further includes display component and above-mentioned optical finger print recognizer component, and the display component is arranged on the housing, the light
The backlight side that the display component is arranged in fingerprint recognition component is learned, the optical finger print recognizer component is electrically connected with the mainboard
It connects.
As shown from the above technical solution, the invention has the benefit that
In optical finger print recognizer component and electronic equipment of the present invention, the light of photosensor layer is entered with big based on fingerprint ridge
Based on angle light, fingerprint valley enter the light of photosensor layer based on low-angle light, by setting refractive index have it is poor
Different first structure layer and the second structure sheaf, screens optical structure layers to the light by fingerprint ridge and fingerprint valley incidence,
Enter the second structure sheaf with the light for stopping incidence angle to be greater than or equal to preset angle, so that photosensitive element receives fingerprint valley incidence
Amount of light is more than the amount of light of fingerprint ridge incidence, so that the fingerprint valley image that photosensitive element is formed is brighter, the fingerprint of formation
The dark images of ridge, so that light and dark fingerprint image is obtained, to carry out fingerprint recognition.Under strong light environment, optical texture
Layer can effectively utilize the increased light of quantity, make the light and shade difference of the fingerprint valley formed on photosensitive element and fingerprint ridge image
Increase, so that light and dark fingerprint image be made to be more clear, to obtain the fingerprint image of high quality, guarantees to refer under strong light environment
The accuracy and validity of line identification.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of an electronic equipment of the present invention wherein embodiment；
Fig. 2 is the structural schematic diagram of an optical finger print recognizer component of the present invention wherein embodiment；
Fig. 3 is the structural schematic diagram of optical structure layers in optical finger print recognizer component shown in Fig. 2；
Fig. 4 is another structural schematic diagram of optical structure layers in optical finger print recognizer component shown in Fig. 2.
The reference numerals are as follows: 100, electronic equipment；10, optical finger print recognizer component；11, substrate；112, circuit layer；
12, photosensor layer；121, photosensitive pixel；13, optical structure layers；131, first structure layer；132, the second structure sheaf；133, it inhales
Photosphere；14, cover layer；15, outline border；20, shell；30, mainboard；40, display component；41, light-emitting component；42, cover board is shown；
43, polaroid；200, fingerprint ridge；300, fingerprint valley.
Specific embodiment
The exemplary embodiment for embodying the application features and advantages will describe in detail in the following description.It should be understood that
The application can have various variations in different embodiments, all not depart from scope of the present application, and theory therein
Bright and diagram inherently is illustrated as being used, rather than to limit the application.
It is well known that biological recognition system is gradually applied in present life, wherein fingerprint recognition is common
One of identification means.The implementation of fingerprint collecting mainly has optical profile type, condenser type and ultrasonic imaging formula, wherein optical fingerprint
The identification range of identification technology is relatively large, advantage of lower cost, thus applies than wide.
Currently, optical fingerprint technology mainly passes through fingerprint ridge and the imaging of fingerprint valley difference in reflectivity.Carrying out fingerprint inspection
When card, the light that light source issues can be reflexed to image sensor by fingerprint ridge and fingerprint valley.Since fingerprint ridge and fingerprint valley reflect
The difference of rate, the light intensity difference that image sensor sensing is reflected back by fingerprint ridge with fingerprint valley, to form corresponding fingerprint image
As and carry out fingerprint recognition.
But present inventor has found after studying, when being directly imaged using fingerprint ridge and fingerprint valley difference in reflectivity,
Under strong light environment, the interference of strong light, leads to collected fingerprint around the light meeting finger of fingerprint ridge and fingerprint valley reflection
There is the case where overexposure in image, influences the accuracy of fingerprint recognition.
In this regard, present inventor has done further research and analysis, when finger contact screen, fingerprint ridge is affixed with screen
It closes, then there is air layer between fingerprint valley and screen.Due to the density of finger skin and the similar density of screen glass, light exists
Refraction angle at fingerprint ridge is smaller, and the angle that the light of screen is transmitted and entered from fingerprint ridge only can be by by a small margin
It narrows, i.e., fingerprint ridge enters the light of screen based on high angle scattered light.
And for the transmitted light at fingerprint valley, due to having air layer between fingerprint valley and screen, the density of air is less than
The density of screen glass, light refraction angle at fingerprint valley is larger, and the light of screen is transmitted and entered from fingerprint valley
Angle can be narrowed significantly, thus enter the light of screen compared to fingerprint ridge, fingerprint valley transmit the light into screen with
Based on the light of low-angle.
It is analyzed based on the studies above, present inventor provides a kind of optical finger print recognizer component and electronic equipment, it is intended to
The interference that will receive strong light around finger using the reflected light imaging of fingerprint valley ridge is solved, so that collected fingerprint image goes out
The case where existing overexposure, the problem of influencing fingerprint recognition accuracy.
In order to further illustrate the principle and structure of the application, preferred embodiment of the present application is carried out now in conjunction with attached drawing detailed
It describes in detail bright.
Refering to fig. 1 and Fig. 2, in one embodiment of the application, electronic equipment 100 includes shell 20 and is arranged in shell 20
The mainboard 30 in portion.The electronic equipment 100 further includes display component 40 and optical finger print recognizer component 10, and wherein display component 40 is set
It sets on the housing 20, the backlight side of display component 40 is arranged in optical finger print recognizer component 10, the optical finger print recognizer component 10
It is electrically connected with mainboard 30.
Specifically, electronic equipment 100 can be mobile phone, television set, tablet computer, laptop, digital camera, navigation
Instrument, intelligent wearable device etc..The electronic equipment 100 improves the accurate of fingerprint recognition by the fingerprint image of acquisition high quality
Property and success rate, facilitate improve electronic equipment 100 performance and user experience.
In the present embodiment, optical finger print recognizer component 10 includes substrate 11, photosensor layer 12 and optical structure layers
13。
Specifically, the surface of substrate 11 is arranged in photosensor layer 12, which includes photosensitive pixel 121.
The side that photosensor layer 12 deviates from substrate 11 is arranged in optical structure layers 13, which includes first to fit
Structure sheaf 131 and the second structure sheaf 132, the refractive index of first structure layer 131 are greater than the refractive index of the second structure sheaf 132.
Wherein, light is reflected into optical structure layers 13 through target fingerprint, and the optical structure layers 13 are for stopping incidence angle
Light refraction greater than preset angle enters the second structure sheaf 132, so that the light that reflects in first structure layer 131 or the
The light that two structure sheafs 132 reflect is received by photosensitive pixel 121, to form fingerprint image.
Incidence angle is for the light direction of propagation and perpendicular to 132 interface direction of first structure layer 131 and the second structure sheaf
Angle, preset angle are the critical angle that light is totally reflected by first structure layer 131 into the second structure sheaf 132.
Further, the display component 40 of the present embodiment be OLED screen (Organic Light Emitting Display,
Organic light-emitting diode (OLED) display screen), which includes display cover board 42, the polaroid being from top to bottom cascading
43 and light-emitting component 41.It is understood that display component 40 can also be LED screen (Light Emitting Diode, hair
Optical diode display screen), LCD screen (Liquid Crystal Display, liquid crystal display) etc..
In the present embodiment, the display cover board 42 of display component 40 is made of transparent glass material, and polaroid 43 is covered on aobvious
Show the lower surface of cover board 42.The light-emitting component 41 of the present embodiment is OLED luminescent panel, can be used as the light source of fingerprint recognition.
When finger is in contact with the surface of display cover board 42, the light that light-emitting component 41 issues is by fingerprint ridge 200 and refers to
Line paddy 300 is reflected into optical structure layers 13, by after the screening of optical structure layers 13 and finally being incuded by photosensitive pixel 121
Imaging, to realize fingerprint recognition.
For the electronic equipment 100 of the present embodiment, luminescence zonal texture, luminescence zonal texture arrangement can be set in display component 40
In the side of optical structure layers 13.The luminescence zonal texture can be LED light annulus, and light-emitting component 41 can be cooperated collectively as finger
The light source of line identification, the light emission luminance of light when enhancing fingerprint recognition, it is ensured that photosensitive pixel 121 accurately obtains fingerprint image.
Further, the backlight side of display component 40 is arranged in optical structure layers 13, passes through 40 lower section optics of display component
The cooperation of structure sheaf 13 and photosensitive pixel 121, to realize the purpose of fingerprint recognition.Such setting is so that optical structure layers 13 and sense
Light pixel 121 will not occupy the display area of display component 40, help to realize the setting that electronic equipment 100 shields comprehensively.
In the present embodiment, optical finger print recognizer component 10 further includes cover layer 14, and cover layer 14 is attached by optical cement
In the lower section of display component 40.The cover layer 14 of the present embodiment is made of clear material, the folding of refractive index and display cover board 42
Penetrate that rate is identical, so that the light projected by photosensor layer 12 is by keeping identical angle to project after cover layer 14.
Together refering to Fig. 2 and Fig. 3, multiple, multiple optical structure layers 13 are can be set in the optical structure layers 13 of the present embodiment
In matrix arrangements between display component 40 and substrate 11, and interval is equipped between two adjacent optical structure layers 13.
In each optical structure layers 13, first structure layer 131 and the second structure sheaf 132 are along perpendicular to photosensor layer
The setting of 12 surface directions, i.e., first structure layer 131 mutually hangs down with the interface of the second structure sheaf 132 and the surface of photosensor layer 12
Directly.The upper surface of first structure layer 131 and the second structure sheaf 132 is concordant and parallel with the surface of photosensor layer 12.
The first structure layer 131 of the present embodiment and the second structure sheaf 132 are formed from a resin.In addition, first structure layer 131
It can also be made of other transparent materials with the second structure sheaf 132.In the present embodiment, the refractive index of first structure layer 131 is big
In the refractive index of the second structure sheaf 132.
When the light of finger reflection is after display component 40 enters optical structure layers 13, some light is by display component 40
First structure layer 131 is injected, then the variation of optical path occurs in first structure layer 131 and the second structure sheaf 132；There are also part light
Line is the second structure sheaf 132 to be emitted directly toward by photosensor layer 12, and the variation of optical path occurs in the second structure sheaf 132.
Light enters first structure layer 131 by display component 40, and injects the second structure sheaf 132 by first structure layer 131
When, the incidence angle of light is for the light direction of propagation and perpendicular to 132 interface direction of first structure layer 131 and the second structure sheaf
Angle.
In the present embodiment, the refractive index of first structure layer 131 is n1, and the refractive index of the second structure sheaf 132 is n2, and n1
Greater than n2.Critical angle C=arcsin (the n1/ that light is totally reflected by first structure layer 131 into the second structure sheaf 132
N2), when incidence angle is greater than critical angle C, light occurs entirely at the interface of first structure layer 131 and the second structure sheaf 132
Reflection.
For being reflected into the light a of optical structure layers 13 by fingerprint ridge 200, light a with perpendicular to first structure layer 131
The incident angle α that angle with 132 interface direction of the second structure sheaf is light a.As the above analysis, fingerprint ridge 200 reflects
Light angle into display component 40 can be narrowed by a small margin, enter the light of display component 40 by fingerprint ridge 200 with big angle
It spends based on light, i.e. dispersion angle of the light in 40 interface of display component is larger.
When the divergence of beam angle of fingerprint ridge 200 into display component 40 is larger, by the refraction of display component 40, light
Still keep biggish dispersion angle when into optical structure layers 13 so that light a with perpendicular to first structure layer 131 and the second knot
The angle in 132 interface direction of structure layer, i.e., the incident angle α of light a is based on small-scale angle.
For being reflected into the light b of optical structure layers 13 by fingerprint valley 300, light b with perpendicular to first structure layer 131
The incident angle β that angle with 132 interface direction of the second structure sheaf is light b.As the above analysis, anti-by fingerprint valley 300
The light angle injected into display component 40 can be narrowed significantly, by fingerprint ridge 200 enter display component 40 light with
Based on low-angle light, i.e., light is smaller in 40 interface dispersion angle of display component.
When the divergence of beam angle of fingerprint valley 300 into display component 40 is smaller, by the refraction of display component 40, light
Still keep lesser dispersion angle when into optical structure layers 13 so that light b with perpendicular to first structure layer 131 and the second knot
The angle in 132 interface direction of structure layer, i.e., the incident angle β of light b is based on large-scale angle.
To sum up, by the incident light a of fingerprint ridge 200 and the light b incident by fingerprint valley 300, the incident angle α of light a with
Based on small-scale angle, the incident angle β of light b is based on large-scale angle.Compared to critical angle C, entered by fingerprint valley 300
Incident angle β occupying the majority greater than critical angle C in the light b penetrated, and only have a small number of incidence by the incident light a of fingerprint ridge 200
Angle α is greater than critical angle C.
When the angle of incidence is larger than a critical angle, incident ray is at the interface of first structure layer 131 and the second structure sheaf 132
It is totally reflected.Since most incident angle βs from the incident light b of fingerprint valley 300 is greater than critical angle C, by fingerprint valley
300 incident most light b are totally reflected at the interface of first structure layer 131 and the second structure sheaf 132, i.e. optics knot
Most light bs of the 13 block incident angle β of structure layer greater than critical angle C enter the second structure sheaf 132, so that majority light b is first
Reflection occurs in structure sheaf 131 and enters photosensitive pixel 121, the induction of the photosensitive pixel 121 a large amount of light incident by fingerprint valley 300
B, to form brighter 300 image of fingerprint valley.
And it is greater than critical angle C due to only having a small number of incident angle αs from the incident light a of fingerprint ridge 200, by fingerprint ridge
Only a small number of light are all-trans at the interface of first structure layer 131 and the second structure sheaf 132 in 200 incident light a
It penetrates, most light a then enter the second structure sheaf 132 and reflect.In a small amount of light a that first structure layer 131 is totally reflected
Can by reflection and enter photosensitive pixel 121, and largely enter the light a that the second structure sheaf 132 reflects can be absorbed and
Can not by photosensitive pixel 121, so that photosensitive pixel 121 can only receive a small amount of light a incident by fingerprint ridge 200, thus
Form darker 200 image of fingerprint ridge.
In the optical finger print recognizer component 10 of the present embodiment, optical structure layers 13 can be to by fingerprint ridge 200 and fingerprint
The incident light of paddy 300 is screened, and photosensitive pixel 121 is made to receive the incident amount of light of fingerprint valley 300 more than fingerprint ridge 200
Incident amount of light so that 300 image of fingerprint valley that photosensitive pixel 121 is formed is brighter, the image of the fingerprint ridge 200 of formation compared with
Secretly, to obtain light and dark fingerprint image, to carry out fingerprint recognition.
Under strong light environment, increased by the light overall quantity of finger beam incident optical structure sheaf 13, so that by fingerprint valley
The quantity that incidence enters the light being totally reflected in first structure layer 131 at 300 increases therewith, is entered by fingerprint ridge 200
Refraction occurs in second structure sheaf 132 and absorbed light can also increase, thus forms fingerprint valley 300 on photosensitive pixel 121
Light and shade difference with 200 image of fingerprint ridge can be bigger, and light and dark fingerprint image can be more clear, it is ensured that fingerprint recognition is strong
Accuracy under luminous environment.
As it can be seen that strong illumination not only will not influence fingerprint image for the optical finger print recognizer component 10 of the present embodiment
It is formed, the amount light difference for making photosensitive pixel 121 receive 300 incidence of fingerprint ridge 200 and fingerprint valley instead is bigger, fingerprint valley 300
The light and shade difference for forming image on photosensitive pixel 121 with fingerprint ridge 200 can also become apparent from, so that the accuracy of fingerprint recognition mentions
It is high.
Further, in the present embodiment, each optical structure layers 13 further include light-absorption layer 133.Light-absorption layer 133 is set vertically
It sets, and is arranged in the outside of first structure layer 131 and the second structure sheaf 132.
The refractive index of the light-absorption layer 133 of the present embodiment is identical as the second structure sheaf 132, which includes black
Extinction particle.When light is totally reflected by the interface of first structure layer 131 and the second structure sheaf 132, and first knot that arrives
When at the interface of structure layer 131 and light-absorption layer 133, since incident angle is constant, light can be still totally reflected, and can be through excessive
It is secondary total reflection and enter photosensitive pixel 121.When light is rolled over by first structure layer 131 and 132 interface of the second structure sheaf
When penetrating and entering the second structure sheaf 132, it can be absorbed by extinction particle in light-absorption layer 133 in the light of the second structure sheaf 132 refraction,
So that being refracted into the light of the second structure sheaf 132 can not be received by photosensitive pixel 121.
The setting of light-absorption layer 133 can guarantee by the incident a large amount of light of fingerprint valley 300 through being totally reflected into photosensitive pixel
121, and guarantee by incident refraction of a large amount of light through the second structure sheaf 132 of fingerprint ridge 200 and absorption, so that it is guaranteed that light-sensitive image
Element 121 receives the difference of fingerprint ridge 200 and 300 incident ray amount of fingerprint valley, makes light and dark fingerprint image more clearly from
It is formed.
Further, in the present embodiment, substrate 11 further includes circuit layer 112, the circuit layer 112 include circuit substrate,
Flexible circuit winding displacement and steel reinforcement.Wherein, steel reinforcement is used for the heat of quick absorbing circuit substrate, and heat is distributed to sky
In gas, make substrate 11 that there is preferably heat dissipation effect, guarantees that substrate 11 works normally.
The photosensor layer 12 of the present embodiment includes multiple photosensitive pixels 121, and multiple 121 compartment of terrain of photosensitive pixel are arranged in
On circuit layer 112.In the present embodiment, the corresponding optical structure layers 13 of each photosensitive pixel 121 are arranged, i.e., multiple optical structure layers
13 correspond to optical structure layers 13 in matrix arrangements on circuit layer 112.Such setting can guarantee by optical structure layers 13
The light of screening is accurately received by photosensitive pixel 121, and photosensitive pixel 121 is made to clearly display fingerprint image.
In addition, in the present embodiment, optical finger print recognizer component 10 further includes outline border 15.14 He of cover layer is arranged in outline border 15
Between circuit layer 112, and it is arranged in the outside of optical structure layers 13 and photosensitive pixel 121.
Refering to Fig. 4, in the optical structure layers 13 of above-described embodiment, first structure layer 131 and the second structure sheaf 132 may be used also
To be parallel to the surface setting of substrate 11, i.e. the interface of first structure layer 131 and the second structure sheaf 132 is parallel to substrate 11
Surface.Wherein, first structure layer 131 is arranged in the side that the second structure sheaf 132 deviates from photosensor layer 12.
When the light of finger reflection is after display component 40 enters optical structure layers 13, light passes through first structure layer
When 131 directive first structure layers 131 and the second 132 interface of structure sheaf, the incidence angle of light be the light direction of propagation with it is vertical
Angle in 132 interface direction of first structure layer 131 and the second structure sheaf.
The refractive index of the first structure layer 131 of the present embodiment is n1, and the refractive index of the second structure sheaf 132 is n2, and n1 is big
In n2.The critical angle C=arcsin (n1/n2) that light is totally reflected by first structure layer 131 into the second structure sheaf 132,
When incidence angle is greater than critical angle C, light is totally reflected at the interface of first structure layer 131 and the second structure sheaf 132.
For being reflected into the light a1 of optical structure layers 13 by fingerprint ridge 200, light a1 with perpendicular to first structure layer
131 and 132 interface direction of the second structure sheaf angle be light a1 incident angle α 1.As the above analysis, fingerprint ridge 200
The light angle for being reflected into display component 40 can be narrowed by a small margin, by fingerprint ridge 200 enter display component 40 light with
Based on high angle scattered light, i.e. dispersion angle of the light in 40 interface of display component is larger.
When the divergence of beam angle of fingerprint ridge 200 into display component 40 is larger, by the refraction of display component 40, light
Still keep biggish dispersion angle when into optical structure layers 13 so that light a1 with perpendicular to first structure layer 131 and second
The angle in 132 interface direction of structure sheaf, i.e. the incident angle α 1 of light a1 is based on large-scale angle.
For being reflected into the light b1 of optical structure layers 13 by fingerprint valley 300, light b1 with perpendicular to first structure layer
131 and 132 interface direction of the second structure sheaf angle be light b1 incident angle β 1.Display is reflected by fingerprint valley 300
The light angle of component 40 can be narrowed significantly, so that entering the light of display component 40 by fingerprint ridge 200 with low-angle
Based on light, i.e., light is smaller in 40 interface dispersion angle of display component.
When the divergence of beam angle of fingerprint valley 300 into display component 40 is smaller, by the refraction of display component 40, light
Still keep lesser dispersion angle when into optical structure layers 13 so that light b1 with perpendicular to first structure layer 131 and second
The angle in 132 interface direction of structure sheaf, i.e. the incident angle β 1 of light b1 is based on small-scale angle.
To sum up, by the incident light a1 of fingerprint ridge 200 and the light b1 incident by fingerprint valley 300, the incident angle α of light a1
1 based on large-scale angle, and the incident angle β 1 of light b1 is based on small-scale angle.Compared to critical angle C, by fingerprint ridge
The occupying the majority greater than critical angle C of incident angle α 1 in 200 incident light a1, and by only having in the incident light b1 of fingerprint valley 300
A small number of incident angle βs 1 is greater than critical angle C.
When the angle of incidence is larger than a critical angle, incident ray is at the interface of first structure layer 131 and the second structure sheaf 132
It is totally reflected.Due to the occupying the majority greater than critical angle C of incident angle α 1 in the incident light a1 of fingerprint ridge 200, by fingerprint
The incident most light of ridge 200 are totally reflected at the interface of first structure layer 131 and the second structure sheaf 132, i.e. optics
Most light of the 13 block incident angle α 1 of structure sheaf greater than critical angle C enter the second structure sheaf 132, only make to be entered by fingerprint ridge 200
The a small amount of light a1 penetrated occurs to reflect and received by photosensitive pixel 121 in the second structure sheaf 132, thus forms darker finger
200 image of wrinkle ridge
And due to the occupying the minority greater than critical angle C of incident angle β 1 from the incident light b1 of fingerprint valley 300, by fingerprint
Only minority is all-trans at the interface of first structure layer 131 and the second structure sheaf 132 in the incident light b1 of paddy 300
It penetrates, most light b1 then enter the second structure sheaf 132 and reflect, i.e., 13 block incident angle β 1 of optical structure layers is greater than critical angle
A small amount of light b1 of C enters the second structure sheaf 132, so that by the incident a large amount of light b1 of fingerprint valley 300 in the second structure sheaf 132
Middle generation is reflected and is received by photosensitive pixel 121, thus forms brighter 300 image of fingerprint valley.
In the optical finger print recognizer component 10 of the present embodiment, optical structure layers 13 can be to by fingerprint ridge 200 and fingerprint
The incident light of paddy 300 is screened, and photosensitive pixel 121 is made to receive the incident amount of light of fingerprint valley 300 more than fingerprint ridge 200
Incident amount of light so that 300 image of fingerprint valley that photosensitive pixel 121 is formed is brighter, the image of the fingerprint ridge 200 of formation compared with
Secretly, to obtain light and dark fingerprint image, to carry out fingerprint recognition.
For the optical finger print recognizer component and electronic equipment of the present embodiment, the light of photosensor layer is entered based on fingerprint ridge
Line is based on high angle scattered light, fingerprint valley enters the light of photosensor layer based on low-angle light, by the way that refractive index is arranged
Have discrepant first structure layer and the second structure sheaf, makes optical structure layers to by fingerprint ridge and the progress of the light of fingerprint valley incidence
Screening enters the second structure sheaf with the light for stopping incidence angle to be greater than or equal to preset angle, so that photosensitive element receives fingerprint valley
Incident amount of light is more than the amount of light of fingerprint ridge incidence, so that the fingerprint valley image that photosensitive element is formed is brighter, is formed
Fingerprint ridge dark images, so that light and dark fingerprint image is obtained, to carry out fingerprint recognition.Under strong light environment, light
The increased light of quantity can be effectively utilized by learning structure sheaf, make the bright of the fingerprint valley formed on photosensitive element and fingerprint ridge image
Dark difference increases, so that light and dark fingerprint image be made to be more clear, to obtain the fingerprint image of high quality, guarantees that fingerprint is known
Other accuracy and validity.
Although describing the application with reference to several exemplary embodiments, it is to be understood that, term used be explanation and
Term exemplary, and not restrictive.Since the application can be embodied in a variety of forms without departing from spirit herein
Or essence, it should therefore be appreciated that above embodiment is not limited to any of the foregoing details, and should be limited in appended claims
Spirit and scope in widely explain, therefore the whole change and modification fallen into claim or its equivalent scope all should be
Appended claims are covered.
Claims (10)
1. a kind of optical finger print recognizer component characterized by comprising
Substrate；
Photosensor layer, is arranged in the surface of the substrate, and the photosensor layer includes the photosensitive pixel of multiple array settings；
And
The side that the photosensor layer deviates from the substrate is arranged in optical structure layers；The optical structure layers include being affixed
The first structure layer and the second structure sheaf of conjunction, the refractive index of the first structure layer are greater than the refractive index of second structure sheaf；
Wherein, light is reflected into the optical structure layers through target fingerprint, and the optical structure layers are for stopping incidence angle big
Enter second structure sheaf in the light refraction of preset angle so that the light that is reflected in the first structure layer or
The light reflected in second structure sheaf is received by the photosensitive pixel, and forms fingerprint image；
The incidence angle is for the light direction of propagation and perpendicular to the first structure layer and the second structure sheaf interface direction
Angle, the preset angle is that light by the first structure layer enters the critical angle that is totally reflected of second structure sheaf.
2. optical finger print recognizer component according to claim 1, which is characterized in that the optical structure layers be equipped with it is multiple,
Multiple optical structure layers are in matrix arrangements, are equipped with interval between adjacent two optical structure layers.
3. optical finger print recognizer component according to claim 2, which is characterized in that the first structure layer and described second
Structure sheaf is vertically arranged, the table of the first structure layer and the second structure sheaf interface perpendicular to the photosensor layer
Face；
The incidence angle is greater than the light of the preset angle at the interface of the first structure layer and second structure sheaf
It is totally reflected, so that the light reflected in the first structure layer enters the photosensitive element.
4. optical finger print recognizer component according to claim 3, which is characterized in that the optical structure layers further include extinction
The outside of the first structure layer and the second structure sheaf is arranged in layer, the light-absorption layer.
5. optical finger print recognizer component according to claim 4, which is characterized in that the refractive index of the light-absorption layer with it is described
The refractive index of second structure sheaf is identical, and the light-absorption layer includes extinction particle.
6. optical finger print recognizer component according to claim 2, which is characterized in that each optical structure layers corresponding one
The photosensitive pixel setting.
7. optical finger print recognizer component according to claim 1, which is characterized in that the first structure layer and described second
The interface of the setting of structure sheaf horizontal stacking, the first structure layer and second structure sheaf is parallel to the table of the substrate
The side that second structure sheaf deviates from the photosensor layer is arranged in face, the first structure layer；
The incidence angle is greater than the light of the preset angle at the interface of the first structure layer and second structure sheaf
It is totally reflected, so that the light reflected in second structure enters the photosensitive element.
8. a kind of electronic equipment, including shell and the mainboard that the enclosure interior is arranged in, which is characterized in that the electronic equipment
It further include display component and the optical finger print recognizer component as described in claim 1-7 any one, the display component setting
On the housing, the backlight side of the display component, the optical finger print identification is arranged in the optical finger print recognizer component
Component is electrically connected with the mainboard.
9. optical finger print recognizer component according to claim 1, which is characterized in that the display component includes display cover board
And polaroid, the display cover board and the polaroid are stacked.
10. optical finger print recognizer component according to claim 9, which is characterized in that the optical finger print recognizer component is also
Including cover layer, the side that the optical structure layers deviate from the photosensor layer, the cover layer is arranged in the cover layer
Refractive index it is identical as the display refractive index of cover board.
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