CN204856529U - Optical profile type fingerprint imaging system - Google Patents
Optical profile type fingerprint imaging system Download PDFInfo
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- CN204856529U CN204856529U CN201520480434.6U CN201520480434U CN204856529U CN 204856529 U CN204856529 U CN 204856529U CN 201520480434 U CN201520480434 U CN 201520480434U CN 204856529 U CN204856529 U CN 204856529U
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Abstract
The utility model provides an optical profile type fingerprint imaging system, includes: the board is shaded, the protective layer has internal surface and surface, optics fingerprint sensor, optics fingerprint sensor be located the protective layer with be shaded between the board, optics fingerprint sensor's upper surface is just right the internal surface of protective layer, the filter layer, the filter layer is located the protective layer internal surface the protective layer surface with one of them surface of optics fingerprint sensor upper surface. Internal surface or optics fingerprint sensor upper surface through the surface at the protective layer, protective layer increase the filter layer, avoid environment light to the fingerprint image like the interference to furthest reduces the influence of environment light to the fingerprint formation of image.
Description
Technical field
The utility model relates to fingerprint sensor field, particularly relates to a kind of optical fingerprint imaging system.
Background technology
Fingerprint imaging recognition technology is the fingerprint image being collected human body by fingerprint sensor, then compares with the existing fingerprint imaging information in system, whether carrys out correct judgment, and then realize the technology of identification.Due to the convenience that it uses, and the uniqueness of somatic fingerprint, fingerprint identification technology is widely used in every field.The gate control system and the consumer product area such as PC and mobile phone etc. of the such as field of safety check such as public security bureau and customs, building.
The implementation of fingerprint imaging technique has the multiple technologies such as optical imagery, capacitance imaging, ultrasonic imaging.Comparatively speaking, optical image technology, its imaging effect is relatively better, and equipment cost is relatively low.
Utility model content
The problem that the utility model solves is to provide a kind of optical fingerprint imaging system, to reduce the impact of surround lighting on fingerprint imaging.
For solving the problem, the utility model provides a kind of optical fingerprint imaging system, comprising:
Backlight;
Protective seam, has inside surface and outside surface;
Optical fingerprint sensor, described optical fingerprint sensor is between described protective seam and described backlight, and the upper surface of described optical fingerprint sensor is just to the inside surface of described protective seam;
Filter layer, described filter layer is positioned at one of them surface of described protective seam inside surface, described protective seam outside surface and described optical fingerprint sensor upper surface.
Optionally, described filter layer comprise interfere reflection horizon and light absorbing zone at least one of them.
Optionally, described interference reflection horizon comprises L layer, and L is positive integer, and wherein, the complex refractive index of jth layer meets relational expression:
i is imaginary number, and j is the positive integer being more than or equal to 1 and being less than or equal to L, parameter
represent the complex refractive index of jth layer, parameter n
jrepresent the refractive index of jth layer, parameter represents k
jrepresent the extinction coefficient of jth layer.
Optionally, the material in described interference reflection horizon is nonmetallic compound or metallic compound.
Optionally, the material in described interference reflection horizon is Na
3alF
6, LiF, MgF
2, ThF
4, CeF
3, PbF
2, ZnS, ZnSe, Si, Ge, Te, PbTe, SiO
2, Al
2o
3, MgO, Y
2o
3, Sc
2o
3, SiO, HfO
2, ZrO
2, CeO
2, Nb
2o
5, Ta
2o
5and TiO
2wherein one or more, or be Ag, Al, Au, Cu, Rh, Ni and Cr wherein one or more, or be inconel.
Optionally, in the L layer in described interference reflection horizon, the thickness range of every one deck is 50nm ~ 5000nm.
Optionally, the total thickness in described interference reflection horizon is 200nm ~ 20000nm.
The material of described light absorbing zone is organism.
Optionally, the material of described light absorbing zone is at least one in black ink, white ink, gray ink, red ink, green ink, blue ink, gold ink, purple ink, green ink, black color blocking, white color blocking, grey color blocking, red color resistance, green color blocking, blue color blocking, golden color blocking, purple color blocking and green color blocking.
Optionally, described light absorbing zone is individual layer or multilayer, and the thickness range of every layer of described light absorbing zone is 500nm ~ 50000nm.
Optionally, the outermost layer of described filter layer is described interference reflection horizon, and the outermost material in described interference reflection horizon is Al
2o
3and SiO
2at least one of them.
Compared with prior art, the technical solution of the utility model has the following advantages:
In the technical solution of the utility model, by increasing filter layer at the outside surface of protective seam, the inside surface of protective seam or optical fingerprint sensor upper surface, avoid surround lighting to the interference of fingerprint image.Utilize filter layer " reflection or absorb most from extraneous toward the surround lighting of optical fingerprint sensor incidence; simultaneously for backlight emergent light be equivalent to transparent or close to transparent " characteristic, farthest to reduce the impact of surround lighting on fingerprint imaging.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of optical fingerprint imaging system;
Fig. 2 is optical fingerprint sensor structural representation in the imaging system of optical fingerprint shown in Fig. 1;
Fig. 3 is the structural representation of a kind of optical fingerprint imaging system that the utility model embodiment provides;
Fig. 4 is that the one of filter layer in the imaging system of optical fingerprint shown in Fig. 3 interferes reflection horizon fundamental diagram;
Fig. 5 is that the another kind of filter layer in the imaging system of optical fingerprint shown in Fig. 3 interferes reflection horizon fundamental diagram;
Fig. 6 is the light absorbing zone fundamental diagram of filter layer in the imaging system of optical fingerprint shown in Fig. 3;
Fig. 7 is the structural representation of the another kind of optical fingerprint imaging system that the utility model embodiment provides;
Fig. 8 is the structural representation of the another kind of optical fingerprint imaging system that the utility model embodiment provides.
Embodiment
Existing optical fingerprint imaging system is easily subject to the interference of surround lighting to fingerprint image.Therefore, need to do surround lighting to isolate.
For this reason, the utility model provides a kind of new optical fingerprint imaging system, comprising: backlight; Protective seam, has inside surface and outside surface; Optical fingerprint sensor, described optical fingerprint sensor is between described protective seam and described backlight, and the upper surface of described optical fingerprint sensor is just to the inside surface of described protective seam; Filter layer, described filter layer is positioned at one of them surface of described protective seam inside surface, described protective seam outside surface and described optical fingerprint sensor upper surface.By increasing filter layer at the outside surface of protective seam, the inside surface of protective seam or optical fingerprint sensor upper surface, avoid surround lighting to the interference of fingerprint image, farthest to reduce the impact of surround lighting on fingerprint imaging.
For enabling above-mentioned purpose of the present utility model, feature and advantage more become apparent, and are described in detail specific embodiment of the utility model below in conjunction with accompanying drawing.
As shown in Figure 1, optical fingerprint imaging system mainly contains backlight 1, optical fingerprint sensor 2, and protective seam 3 forms.When gathering fingerprint image, human body finger 4 is positioned on protective seam 3; The emergent light 11 of backlight 1, through optical fingerprint sensor 2 and protective seam 3, occurs to reflect and transmission at the contact interface of human body finger 4 with protective seam 3; The light 12 of reflection, through protective seam 3, is irradiated on optical fingerprint sensor 2; Optical fingerprint sensor 2 carries out opto-electronic conversion and signal transacting, realizes the collection of fingerprint image.Human body finger 4 reflects the fingerprint characteristic of human body with the surface of contact feature of protective seam 3, and the feature of this surface of contact directly can affect the feature of reflected light 12, and therefore, the image that optical fingerprint sensor 2 collects directly reflects the feature of somatic fingerprint.
As shown in Figure 2, optical fingerprint sensor 2 is made up of signal wire 21, drive wire 22 and pixel (mark) array.Wherein said pixel comprises again Signal-controlled switch 231, sensor devices 232 and transmission region 233.Gauge tap 231 and sensor devices 232 all light tight, the transmission region 233 of described pixel is other parts except signal wire 21, drive wire 22, gauge tap 231 and sensor devices 232.The emergent light 11 of backlight 1 is irradiated to the contact interface of human body finger 4 and protective seam 3 by transmission region 233.Visible, optical fingerprint sensor 2 has light transmission function.
The optical fingerprint imaging system that the present embodiment provides increases filter layer in said structure.Specifically please refer to Fig. 3, optical fingerprint imaging system comprises aforesaid backlight 1, protective seam 3, optical fingerprint sensor 2 and filter layer 4.Wherein, protective seam 3 has inside surface (mark) and outside surface (mark); optical fingerprint sensor 2 is between protective seam 3 and backlight 1, and the upper surface (mark) of optical fingerprint sensor 2 is just to the inside surface of protective seam 3.In the present embodiment, filter layer 4 is positioned at protective seam 3 outside surface.
In the present embodiment, because filter layer 4 is positioned at protective seam 3 outside surface, namely filter layer 4 is positioned at the outermost of whole optical fingerprint imaging system; in actual use; finger can touch filter layer 4, so need filter layer 4 to have higher hardness, the external object scraping such as prevents from being pointed and damages.
In the present embodiment, filter layer 4 comprises interferes reflection horizon 41 and light absorbing zone 42.The effect of filter layer 4 carries out filter action to surround lighting.Wherein, interfere reflection horizon 41 to realize filter action by interference effect and reflex, and light absorbing zone 42 utilize absorption and reflex to realize filter action.Light absorbing zone 42 mainly utilizes it to reach filter action to the absorption of surround lighting.
In the present embodiment, interfere reflection horizon 41 comprise L layer, L be greater than 1 positive integer.As shown in Figure 5, the principle of work in the interference reflection horizon 41 with L Rotating fields is given.The complex refractive index of interference reflection horizon 41 jth layer is
the thickness of jth layer is d
j, the refractive index of jth layer is n
j, the extinction coefficient of jth layer is k
j, j be more than or equal to 1 and be less than or equal to L positive integer (j=1,2 ..., L), i is imaginary number, then, the complex refractive index of jth layer meets relational expression:
Suppose to interfere the material refractive index above reflection horizon 41 to be n
m, this material called after ground floor, the material refractive index below interference reflection horizon 41 is
this material called after second layer.That is, interfering reflection horizon 41 to be positioned at refractive index is n
mground floor and refractive index be
the second layer between.
Further hypothesis total amount is that the light of light total amount 1.0 is with incidence angle θ
0enter from ground floor and interfere reflection horizon 41, then, in interference reflection horizon 41, refraction angle when light enters jth layer becomes θ
j, light multiple reflections and refraction in interference reflection horizon 41, and mutually interfere, finally obtain a reflected light R and transmitted light T, transmitted light T enters into the second layer, and reflected light R is reflected back in ground floor.
According to above-mentioned relation formula:
interfere the complex refractive index of the jth layer in reflection horizon 41
if real number, due to
representing every one deck not to carrying out light absorption, namely representing k
j=0, namely represent that this interferes the material in reflection horizon 41 not absorb incident light, only reflect, reflect and transmission;
if plural, then represent that the material of this layer not only reflects incident light, reflect and transmission, also incident light is absorbed.When interfering the every one deck in reflection horizon 41 not to absorbing incident light, then there is relational expression: R+T=1.0; If it (is not namely whole k that some layer corresponding absorbs light
jall equal 0), then R+T+A=1.0, wherein A represents the absorption interfering reflection horizon 41 overall to light.
As R+T=1.0, the boundary condition of the Matrix Formula of pushing over out based on electromagnetic Maxwell equation and whole film system, can learn R, and T is n
j, d
j, θ
j, and the function of lambda1-wavelength λ, and the n in jth layer
jand d
jcan control according to the selection of material and manufacturing process.That is, only need the wavelength coverage knowing surround lighting, just can know and how corresponding interference reflection horizon 41 is set, to reach the effect making surround lighting cannot pass through to interfere reflection horizon 41.
Said process is light arrives the second layer through interference reflection horizon 41 situation from ground floor.Otherwise light is from the second layer through the situation identical with said process (volume reflection R ' as shown in Figure 4) of interfering reflection horizon 41 to arrive ground floor, and principle is also identical.Corresponding said process, can by ground floor wherein as being the outside or Rotating fields of interfering reflection horizon 41 to contact, and now ground floor can be air, also can be light absorbing zone 42.And the second layer can be regarded as and other layer of interfering reflection horizon 41 to contact, such as, can be light absorbing zone 42, also can be protective seam 3.
It should be noted that, as shown in Figure 5, in other embodiments, if need to modulate the surround lighting of wider wavelength coverage, the interference reflection horizon (film layer structure) of a series of different-thickness and material can be adopted.Such as, interfere reflection horizon can a total L layer main stor(e)y, each main stor(e)y can have again the secondary layer (each secondary layer such as shown in Fig. 5) of multilayer, and the pair included by each main stor(e)y layer by layer number can be identical, also can be different.According to actual requirement, thickness and the material of each main stor(e)y and each secondary layer can be adjusted, thus make interference reflection horizon reach better filter action.This interference reflection horizon with the secondary layer of multilayer can be that to be positioned at refractive index be n equally
mground floor and refractive index be n
sthe second layer in, its concrete interference effect and reflex principle can with reference to foregoing teachings.
In the present embodiment, the material of interfering reflection horizon 41 can be nonmetallic compound or metallic compound.Interfere reflection horizon 41 to comprise sandwich construction, the thickness of each layer and material can be different.Concrete, when the material of interfering reflection horizon 41 is nonmetallic compound or metallic compound, the material of interfering reflection horizon 41 can be Na
3alF
6, LiF, MgF
2, ThF
4, CeF
3, PbF
2, ZnS, ZnSe, Si, Ge, Te, PbTe, SiO
2, Al
2o
3, MgO, Y
2o
3, Sc
2o
3, SiO, HfO
2, ZrO
2, CeO
2, Nb
2o
5, Ta
2o
5and TiO
2wherein one or more.The material in interference reflection horizon 41 can also be the alloy of metal or metal, can be specifically the metal material obvious to visible ray, infrared light and UV Absorption, such as interfere the material in reflection horizon 41 be Ag, Al, Au, Cu, Rh, Ni, Cr and inconel wherein one or more.
In the present embodiment, the total thickness of interfering reflection horizon 41 can be 500nm ~ 20000nm.Occur whether have half-wave loss when reflecting according to light at interface, and the angle of incident light, determine the thickness of every one deck of interfering inside, reflection horizon 41.The thickness of every one deck can be less than optical wavelength, also can be greater than optical wavelength, and net result makes the phase 180 degree between incident light, reflected light, transmitted light realize light to slacken, or phase 360 degree realizes light enhancing.When all will there be effect to the light of multiple wavelength, then have plurality of layers, different layers thickness can be different.Generally, visible wavelength is at 400nm to 900nm, and the larger infrared light of some wavelength is also for fingerprint recognition, and therefore, the thickness range of every one deck can be 50nm ~ 5000nm.Consider and interfere inside, reflection horizon 41 can have plurality of layers (such as sometimes can reach 10 layers, even reach 50 layers), therefore interfere the thickness range in reflection horizon 41 to control at more than 200nm.Interfere total number of plies more (namely the value of L is larger) of inside, reflection horizon 41, more by the wavelength of interference light, effect can be better.But, in order to make corresponding technology difficulty and cost be controlled, control interfering the gross thickness in reflection horizon 41 at below 20000nm.Therefore, the total thickness in interference reflection horizon 41 can at 200nm to 20000nm.
Please refer to Fig. 6, the schematic diagram of light absorbing zone 42, light absorbing zone 42 pairs of incident lights have reflection and absorption, also have transmission effect.When the light (shown in light absorbing zone 42 arrow entered in as Fig. 6) supposing that total amount is light summation 1.0 enters light absorbing zone 42, have T1 fractional transmission cross light absorbing zone 42 (as in Fig. 6 through shown in the arrow of light absorbing zone 42), have the light of R1 part to reflect (as shown in the arrow that reflects obliquely in Fig. 6).In addition, some light is absorbed, and the amount of this part is A1 (not showing A1 in Fig. 6), now meets relational expression: R1+T1+A1=1.0.That is, light absorbing zone 42 participant light absorbing interference reflection horizon 41 meets same refraction, reflection and transmission rule.
In the present embodiment, the material of light absorbing zone 42 can be organism.
In the present embodiment, the material of light absorbing zone 42 can be at least one in black ink, white ink, gray ink, red ink, green ink, blue ink, gold ink, purple ink, green ink, black color blocking, white color blocking, grey color blocking, red color resistance, green color blocking, blue color blocking, golden color blocking, purple color blocking and green color blocking.
In the present embodiment, light absorbing zone 42 is individual layer or multilayer, and the thickness range of light absorbing zone 42 is 500nm ~ 50000nm.Light absorbing zone 42 can be a kind of light absorbing zone (i.e. single layer structure) of color of light, also can be light absorbing zone superposition (i.e. sandwich construction) of multiple color light.The thickness of light absorbing zone 42 is between 500nm to 50000nm.This is because light absorbing zone 42 is that the material granule mixed by itself or the inside realizes light absorption and reflex, thus reaches the effect of optical filtering.In using, according to different demand selection material, different effects can be reached, and and then the thickness of decision actual membrane.Owing to usually needing to adopt printing effect to form light absorbing zone 42, therefore, the THICKNESS CONTROL of light absorbing zone 42 is at more than 500nm.Such as, filter if monochromatic (as filtered redness, green, or blue), thickness need not be too thick, is generally several microns or zero point several microns, even thinner, just can reach requirement.And require that outer light color is white, then need the light reflected close to more than 95%, seeming just can relatively in vain, then general thickness will do thicker, reach tens microns.But light absorbing zone 42 can not be too thick, therefore, by the THICKNESS CONTROL of light absorbing zone 42 at below 50000nm.
It should be noted that, in other embodiments, filter layer 4 can only comprise interferes reflection horizon 41 (interfering reflection horizon 41 can be made up of sandwich construction), also light absorbing zone 42 (light absorbing zone 42 can be made up of sandwich construction) can only be comprised, it can also be the composite bed of interfering reflection horizon 41 and light absorbing zone 42 to combine, such as interference reflection horizon 41 and light absorbing zone 42 are alternately stacked, or interfere reflection horizon 41 and the irregular overlap of light absorbing zone 42.
Mention above; in the present embodiment; because filter layer 4 is positioned at protective seam 3 upper surface; namely the outermost of whole optical fingerprint sensor 2 is positioned at; in actual use; finger can touch filter layer 4, so need filter layer 4 to have higher hardness, the external object scraping such as prevents from being pointed and damages.Therefore, in the present embodiment, when filter layer 4 comprises interference reflection horizon 41 and light absorbing zone 42, the outermost layer controlling filter layer 4, for interfering reflection horizon 41, interferes the outermost material in reflection horizon 41 to be Al
2o
3and SiO
2at least one of them.Further, select to make by PVD technique to interfere reflection horizon 41 outermost layer, thus further raising interferes the outermost hardness in reflection horizon 41.
In the present embodiment, in order to not affect the actual fingerprint imaging effect of optical fingerprint imaging system, filter layer 4 needs the emergent light of the backlight 1 to optical fingerprint imaging system to have higher transmissivity, namely filter layer 4 needs to have less absorptivity and reflectivity to the backlight of optical fingerprint sensor 2, therefore by the above-mentioned control to filter layer 4 material and thickness, the absorptivity of filter layer 4 pairs of backlights and reflectivity are controlled to as far as possible little scope.
In the present embodiment, by adjustment film layer structure and material, filter layer 4 surround lighting is to external world made to have comparatively low transmissivity.Perfect transmission is 0%, usually cannot reach, but adjusts as target as far as possible.Now, requirement is not done for filter layer 4 pairs of environment light reflectance.
Be the incident light of 1.0 for light summation, suppose that the uptake of filter layer 4 pairs of surround lightings is A
z(this absorption A
zrefer to the gross absorption of interfering reflection horizon 41 and light absorbing zone 42), the volume reflection of filter layer 4 pairs of surround lightings is R
z(this volume reflection R
zrefer to total volume reflection of interfering reflection horizon 41 and light absorbing zone 42), the transmission amount of filter layer 4 pairs of surround lightings is T
z(this transmission amount T
zrefer to total transmission amount of interfering reflection horizon 41 and light absorbing zone 42), by control R
z, T
zand A
z, can mainly play the effect preventing surround lighting from entering optical fingerprint imaging system inside, avoid surround lighting to impact fingerprint imaging effect.Therefore, general design filter layer 4 to external world incident light there is lower transmissivity.Because, for volume reflection R
z, due to R
z+ T
z+ A
z=1.0, suppose A
zsubstantially constant, work as R
ztime larger, T
znaturally less, surround lighting is reflected away by major part, greatly can reduce surround lighting and enter optical fingerprint imaging system inside (i.e. T
zreduce), avoid surround lighting to impact fingerprint imaging effect; Meanwhile, R is worked as
ztime larger, can allow on the protective seam 3 of optical fingerprint imaging system, the appearance color with filter layer 4 region seems brighter, such as greyish white or silver color etc.Work as R
ztime smaller, T
znaturally larger; it is inner that surround lighting major part enters optical fingerprint imaging system; can allow on the protective seam 3 of optical fingerprint imaging system; the appearance color with filter layer 4 region seems darker; such as grey black or black etc., (namely the time needs absorption A now to need filter layer 4 to have absorption light characteristic
zlarger), to sponge the light entering filter layer 4, thus avoid ambient light effects fingerprint imaging effect.
Filter layer 4 another one vital role is the appearance color changing optical fingerprint imaging system.Interfering reflection horizon 41 or light absorbing zone 42 to the reflection of light and absorption by changing, the appearance color of optical fingerprint imaging system can be changed, improve the aesthetics of product.When appearance color requires brighter, adjustment filter layer 4 to external world incident light has lower absorptivity; When outer light color requires darker, adjustment filter layer 4 to external world incident light has higher absorptivity.In like manner, when appearance color requires brighter, adjustment filter layer 4 to external world incident light has higher reflectivity; When outer light color requires darker, adjustment filter layer 4 to external world incident light has lower reflectivity.Known, when needs optical fingerprint imaging system appearance color is brighter, can, by adjustment film layer structure and material, make filter layer 4 pairs of surround lightings have high reflectance, comparatively low absorptivity; When needs optical fingerprint imaging system appearance color is darker, by adjustment film layer structure and material, filter layer 4 pairs of surround lightings are made to have comparatively antiradar reflectivity, higher absorption rate.
In summary, by regulating the structure of filter layer 4, can prevent surround lighting from entering optical fingerprint imaging system inside, avoiding surround lighting to impact fingerprint imaging effect; The appearance color of optical fingerprint imaging system can also be changed.
Compared to existing optical fingerprint imaging system; in the optical fingerprint imaging system that the present embodiment provides; protective seam 3 increases filter layer 4; not only can prevent surround lighting from entering optical fingerprint imaging system; prevent ambient light effects fingerprint imaging effect, improve fingerprint imaging quality, can also by regulating reflectivity and the absorptivity of filter layer 4; change the appearance color of optical fingerprint imaging system, improve aesthetics.That is, reflex and the absorption of filter layer 4 pairs of surround lightings are (above-mentioned known, reflection horizon 41 is interfered to have reflex and absorption, light absorbing zone 42 also has reflex and absorption), can prevent surround lighting from entering optical fingerprint imaging system inside, avoid surround lighting to impact fingerprint imaging effect, improve fingerprint imaging quality.Meanwhile, by adjustment, also ensure that filter layer 4 does not affect the backlight that optical fingerprint imaging system is used for fingerprint recognition simultaneously, thus do not affect fingerprint imaging effect.
That is; in the present embodiment; filter layer is increased by the outside surface at protective seam; avoid surround lighting to the interference of fingerprint image; utilize filter layer " reflection or absorb most from extraneous toward the surround lighting of optical fingerprint sensor incidence; simultaneously for backlight emergent light be equivalent to transparent or close to transparent " characteristic, farthest to reduce the impact of surround lighting on fingerprint imaging.
Another embodiment of the utility model provides another kind of optical fingerprint imaging system, please refer to Fig. 7.In described optical fingerprint imaging system, comprise backlight 1, protective seam 3, optical fingerprint sensor 2 and filter layer 5 equally.Wherein, protective seam 3 has inside surface (mark) and outside surface (mark); optical fingerprint sensor 2 is between protective seam 3 and backlight 1, and the upper surface (mark) of optical fingerprint sensor 2 is just to the inside surface of protective seam 3.In the present embodiment, filter layer 5 is positioned at protective seam 3 inside surface.
The concrete structure of the filter layer 5 that the present embodiment provides can with reference to previous embodiment corresponding contents (i.e. filter layer 5 can with reference to filter layer 4 corresponding contents).
In the present embodiment, because filter layer 5 is positioned at protective seam 3 inside surface, namely between protective seam 3 and optical fingerprint sensor 2, in actual use, finger can not touch filter layer 5, so, do not need filter layer 5 to have higher hardness.Further, because filter layer 5 is positioned at protective seam 3 inside surface, filter layer 5 can be made to obtain the protection of protective seam, therefore, more not be vulnerable to the impact of external environment, such as, be not vulnerable to the corrosion of air or moisture.
Another embodiment of the utility model provides another kind of optical fingerprint imaging system, please refer to Fig. 8.In described optical fingerprint imaging system, comprise backlight 1, protective seam 3, optical fingerprint sensor 2, filter layer 6 and filter layer 7 equally.Wherein, protective seam 3 has inside surface (mark) and outside surface (mark); optical fingerprint sensor 2 is between protective seam 3 and backlight 1, and the upper surface (mark) of optical fingerprint sensor 2 is just to the inside surface of protective seam 3.In the present embodiment, filter layer 7 is positioned at the outside surface of protective seam 3, and filter layer 8 is positioned at the inside surface of protective seam 3.
The filter layer 7 that the present embodiment provides and the concrete structure of filter layer 8 can with reference to previous embodiment corresponding contents (i.e. filter layer 7 and filter layer 8 can with reference to filter layer 4 corresponding contents).
In the present embodiment, because filter layer 7 is positioned at protective seam 3 outside surface, namely filter layer 7 is positioned at the outermost of whole optical fingerprint imaging system; in actual use; finger can touch filter layer 7, so need filter layer 7 to have higher hardness, the external object scraping such as prevents from being pointed and damages.Because whole optical fingerprint imaging system has two-layer filter layer (filter layer 7 and filter layer 8), the present embodiment can carry out filter action to surround lighting better.
Although the utility model discloses as above, the utility model is not defined in this.Any those skilled in the art, not departing from spirit and scope of the present utility model, all can make various changes or modifications, and therefore protection domain of the present utility model should be as the criterion with claim limited range.
Claims (8)
1. an optical fingerprint imaging system, is characterized in that, comprising:
Backlight;
Protective seam, has inside surface and outside surface;
Optical fingerprint sensor, described optical fingerprint sensor is between described protective seam and described backlight, and the upper surface of described optical fingerprint sensor is just to the inside surface of described protective seam;
Filter layer, described filter layer is positioned at one of them surface of described protective seam inside surface, described protective seam outside surface and described optical fingerprint sensor upper surface.
2. optical fingerprint imaging system as claimed in claim 1, is characterized in that, described filter layer comprise interfere reflection horizon and light absorbing zone at least one of them.
3. optical fingerprint imaging system as claimed in claim 2, it is characterized in that, described interference reflection horizon comprises L layer, and L is positive integer, and wherein, the complex refractive index of jth layer meets relational expression:
i is imaginary number, and j is the positive integer being more than or equal to 1 and being less than or equal to L, parameter
represent the complex refractive index of jth layer, parameter n
jrepresent the refractive index of jth layer, parameter represents k
jrepresent the extinction coefficient of jth layer.
4. optical fingerprint imaging system as claimed in claim 2 or claim 3, it is characterized in that, the material in described interference reflection horizon is nonmetallic compound or metallic compound.
5. optical fingerprint imaging system as claimed in claim 2, it is characterized in that, described interference reflection horizon is individual layer or multilayer, and the thickness range of every one deck is 50nm ~ 5000nm, and the total thickness in described interference reflection horizon is 200nm ~ 20000nm.
6. optical fingerprint imaging system as claimed in claim 2, it is characterized in that, the material of described light absorbing zone is organism.
7. optical fingerprint imaging system as claimed in claim 2, it is characterized in that, described light absorbing zone is individual layer or multilayer, and the thickness range of described light absorbing zone is 500nm ~ 50000nm.
8. optical fingerprint imaging system as claimed in claim 2, it is characterized in that, the outermost layer of described filter layer is described interference reflection horizon.
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| CN105512645A (en) * | 2016-01-19 | 2016-04-20 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| WO2017118031A1 (en) * | 2016-01-07 | 2017-07-13 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN106991366A (en) * | 2016-01-21 | 2017-07-28 | 上海箩箕技术有限公司 | Optical fingerprint sensor |
| CN107967876A (en) * | 2016-10-20 | 2018-04-27 | 上海箩箕技术有限公司 | Display unit and display screen |
| CN107967870A (en) * | 2016-10-20 | 2018-04-27 | 上海箩箕技术有限公司 | Display unit and display screen |
| CN108388827A (en) * | 2017-02-03 | 2018-08-10 | 上海箩箕技术有限公司 | Fingerprint imaging module and electronic equipment |
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| CN111052143A (en) * | 2019-04-10 | 2020-04-21 | 深圳市汇顶科技股份有限公司 | Optical fingerprint device and electronic equipment |
| CN107480579B (en) * | 2016-06-08 | 2021-03-16 | 联咏科技股份有限公司 | Optical sensor element and fingerprint sensor device |
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| WO2017118031A1 (en) * | 2016-01-07 | 2017-07-13 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| US10528788B2 (en) | 2016-01-07 | 2020-01-07 | Shanghai Oxi Technology Co., Ltd | Optical fingerprint module |
| US10546175B2 (en) | 2016-01-07 | 2020-01-28 | Shanghai Oxi Technology Co., Ltd | Optical fingerprint module |
| WO2017124737A1 (en) * | 2016-01-19 | 2017-07-27 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN105512645A (en) * | 2016-01-19 | 2016-04-20 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN106991366A (en) * | 2016-01-21 | 2017-07-28 | 上海箩箕技术有限公司 | Optical fingerprint sensor |
| CN107480579B (en) * | 2016-06-08 | 2021-03-16 | 联咏科技股份有限公司 | Optical sensor element and fingerprint sensor device |
| CN107967876A (en) * | 2016-10-20 | 2018-04-27 | 上海箩箕技术有限公司 | Display unit and display screen |
| CN107967870A (en) * | 2016-10-20 | 2018-04-27 | 上海箩箕技术有限公司 | Display unit and display screen |
| CN108388827A (en) * | 2017-02-03 | 2018-08-10 | 上海箩箕技术有限公司 | Fingerprint imaging module and electronic equipment |
| CN108388827B (en) * | 2017-02-03 | 2020-06-26 | 上海箩箕技术有限公司 | Fingerprint imaging module and electronic equipment |
| CN111052143A (en) * | 2019-04-10 | 2020-04-21 | 深圳市汇顶科技股份有限公司 | Optical fingerprint device and electronic equipment |
| CN111052143B (en) * | 2019-04-10 | 2023-09-08 | 深圳市汇顶科技股份有限公司 | Optical fingerprint device and electronic equipment |
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