CN206470786U - A kind of optical system of fingerprint imaging - Google Patents
A kind of optical system of fingerprint imaging Download PDFInfo
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- CN206470786U CN206470786U CN201720165120.6U CN201720165120U CN206470786U CN 206470786 U CN206470786 U CN 206470786U CN 201720165120 U CN201720165120 U CN 201720165120U CN 206470786 U CN206470786 U CN 206470786U
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- light
- fingerprint
- optical system
- near infrared
- fingerprint imaging
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Abstract
The utility model embodiment discloses a kind of optical system of fingerprint imaging.The optical system of the fingerprint imaging is applied in mobile terminal, including：Cover-plate glass, for encapsulating and protecting the optical system；Light emitting display, for producing RGB rgb light and display image；Lighting module, including near infrared light light source and light guide plate, for illuminating the light emitting display and fingerprint；Near infrared light optical filter, for filtering out the rgb light；Lens group, is arranged at below the near infrared light optical filter, filters out near infrared light and imaging after the rgb light for assembling the near infrared light optical filter, forms fingerprint image；Photo-sensitive cell, is arranged at below the lens group, the fingerprint image for sensing the lens group formation.The optical system for the fingerprint imaging that the present embodiment is provided, can be achieved the fingerprint imaging of mobile terminal full screen, improve the durability of fingerprint imaging system, reduction fingerprint recognition cost in the terminal and energy consumption.
Description
Technical field
The utility model embodiment is related to fingerprint identification technology field, more particularly to a kind of optical system of fingerprint imaging.
Background technology
Because fingerprint has the advantages that uniqueness, stability and reliability, fingerprint identification technology is accounted in field of biological recognition
According to important advantage.With the extensive use of mobile terminal, great mass of data and individual privacy can be stored in mobile whole by user
In end, in order to prevent data and privacy from leaking outside, user is protected by setting password, and traditional numeral, letter or figure
Shape password is easy to be cracked, now, and finger-print cipher is widely paid close attention to.
In the prior art, the fingerprint imaging technique that mobile terminal is used be capacitance type fingerprint be imaged or ultrasonic type fingerprint into
Picture, wherein, capacitance type fingerprint imaging system poor durability, the power consumption of ultrasonic type fingerprint imaging system is high and cost is big, is unfavorable for
Extensive use.
Utility model content
The utility model embodiment provides a kind of optical system of fingerprint imaging, improves the durability of fingerprint recognition system,
Reduce fingerprint imaging cost in the terminal and energy consumption.
In a first aspect, the utility model embodiment provides a kind of optical system of fingerprint imaging, the light of the fingerprint imaging
System, including：
Cover-plate glass, for encapsulating and protecting the optical system；
Light emitting display, is arranged at below the cover-plate glass, for producing RGB rgb light and display image；
Lighting module, is arranged at below the light emitting display, including near infrared light light source and light guide plate, for illuminating
State light emitting display and fingerprint；
Near infrared light optical filter, is arranged at below the lighting module, for filtering out the rgb light；
Lens group, is arranged at below the near infrared light optical filter, institute is filtered out for assembling the near infrared light optical filter
The near infrared light after rgb light and imaging are stated, fingerprint image is formed；
Photo-sensitive cell, is arranged at below the lens group, the fingerprint image for sensing the lens group formation.
Further, the light emitting display is LCDs LCD.
Further, the light emitting display is light emitting diode OLED display screen.
Further, the lens group is microlens array.
Further, the lens group is gradient-index lens.
Further, the gradient-index lens are the selfoc lens array of gradient refraction.
Further, in addition to：
First polarized light piece, is arranged at below the cover-plate glass and above the light emitting display, described for adjusting
The polarization direction of rgb light；
Second polarized light piece, is arranged at below first polarized light piece and above the light emitting display, for adjusting
The polarization direction of the rgb light.
Further, in addition to：
Brightening piece, is arranged at below second polarized light piece and above the light guide plate, for strengthening by the leaded light
The light that plate is sent.
Further, in addition to：
Substrate glass, is arranged at below the light emitting display and above the near infrared filter.
The utility model embodiment provides a kind of optical system of fingerprint imaging, and the operation principle of the optical imagery is：According to
The near infrared light that bright module is produced, is illuminated to the fingerprint being positioned on cover-plate glass, and illuminated fingerprint is by near infrared light
Reflection, the near infrared light being reflected back is filtered through near infrared light optical filter, and rgb light therein is filtered into reservation near infrared light,
Near infrared light after near infrared light optical filter is assembled by lens group to be imaged, and the fingerprint image of formation is felt by photo-sensitive cell
Should.The optical imaging system is applied in mobile terminal, realizes the fingerprint imaging of mobile terminal full screen, improves fingerprint imaging system
The durability of system, reduction fingerprint imaging cost in the terminal and energy consumption.
Brief description of the drawings
Fig. 1 is the cross section structure schematic diagram of the optical system of the fingerprint imaging in the utility model embodiment one；
Fig. 2 is the microlens array imaging schematic diagram in the utility model embodiment one；
Fig. 3 is the gradient-index lens imaging schematic diagram in the utility model embodiment one；
Fig. 4 is the cross section structure schematic diagram of the optical system of the fingerprint imaging in the utility model embodiment two.
Embodiment
Below with drawings and examples, the utility model is described in further detail.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than limits of the present utility model.Further need exist for
It is bright, for the ease of description, the part related to the utility model rather than entire infrastructure are illustrate only in accompanying drawing.
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The processing described as flow chart or method.Although each step is described as the processing of order, many of which by flow chart
Step can be implemented concurrently, concomitantly or simultaneously.In addition, the order of each step can be rearranged.When its operation
The processing can be terminated during completion, it is also possible to the additional step being not included in accompanying drawing.The processing can be with
Corresponding to method, function, code, subroutine, subprogram etc..
Embodiment one
Fig. 1 is the cross section structure schematic diagram of the optical system for the fingerprint imaging that the utility model embodiment one is provided, this reality
The situation that example is applicable to fingerprint optical imagery is applied, as shown in figure 1, the optical system of the fingerprint imaging includes：Cover-plate glass
110, light emitting display 120, lighting module 130, near infrared light optical filter 140, lens group 150 and photo-sensitive cell 160.
Cover-plate glass 110, for encapsulating and protecting optical system.Light emitting display 120, is arranged under cover-plate glass 110
Side, for producing RGB rgb light and display image.Lighting module 130, is arranged at the lower section of light emitting display 120, including near red
Outer radiant and light guide plate, for illuminating light emitting display and fingerprint.Near infrared light optical filter 140, is arranged at lighting module 130
Lower section, for filtering out rgb light.Lens group 150, is arranged at the lower section of near infrared light optical filter 140, is filtered for assembling near infrared light
Piece filters out the near infrared light after rgb light and imaging, forms fingerprint image.Photo-sensitive cell 160, is arranged at below lens group, is used for
Sense the fingerprint image of lens group formation.
In the present embodiment, cover-plate glass 110 can be the safety glass that main component is silica, for encapsulating and
Whole optical imaging system is protected, in fingerprint imaging, fingerprint need to be close to the top of cover-plate glass 110.
Light emitting display 120, can produce RGB (Red Green Blue, RGB) light and display image.
It is preferred that, light emitting display 120 is LCDs (Liquid Crystal Display, LCD).
It is preferred that, light emitting display 120 is organic light-emitting diode (OLED) display screen (Organic Light-Emitting
Diode, OLED).
Lighting module 130, including near-infrared light source and light guide plate.Wherein, light guide plate can be the acrylic in optical grade
Print what light guiding points were made using screen printing technology on sheet material, spot light or line source can be changed into face light by light guide plate
Source, the principle that spot light or line source are changed into area source, which can be that the illumination sent by spot light or line source is mapped to, to be led
During each light guiding points in tabula rasa, light guiding points are reflected incident light, and reflected light spreads to destroy reflection along all angles
Condition makes light be projected by light guide plate front.Density and light guiding points not of uniform size on light guide plate can make equal by the light of light guide plate
It is even to project.Near-infrared light source can produce near infrared light, wherein, near infrared light (Near Infrared Spectrum
Instrument, NIRS) be electromagnetic radiation as waves between visible ray and mid-infrared light, centre wavelength 780-1500nm it
Between, it is preferred that the centre wavelength scope for the near infrared spectrum that the present embodiment is used is 1000-1500nm.
Near infrared light optical filter 140 can be made up, be made up of coloured glass or by special type of optical glass coating
Plastics are made.Near infrared light optical filter 140 can reflect visible ray, pass through near infrared light, in this application off field, it is preferred that near
Infrared light optical filter 140 can pass through near infrared light of the centre wavelength between 1000-1500nm.
Lens group 150 has the function of focal imaging, is filtered out for assembling the near infrared light optical filter after visible ray
Near infrared light is simultaneously imaged, and forms fingerprint image.
Under this application scene, it is preferred that lens group 150 is microlens array.Microlens array can be by light hole
Footpath and relief depth are the array that micron-sized lens are constituted, and the operation principle of microlens array can be, when light beam is irradiated to
When on microlens array, light wave is spatially divided into many small parts by microlens array, and each section is by corresponding small
Lens focus is on focal plane.Exemplary, Fig. 2 is the microlens array imaging schematic diagram in the utility model embodiment one,
As shown in Fig. 2 the near infrared light that the point A on fingerprint 201 on cover-plate glass is reflected back is reached after microlens array 202, quilt
One of lenslet of microlens array 202 is focused on and is imaged onto on photo-sensitive cell 160, forms picture point A ', similarly, fingerprint
Other points on 201 also with same image-forming principle by microlens array imaging on photo-sensitive cell 160.The institute of photo-sensitive cell 160
Plane overlapped with the focal plane of microlens array 202.
Under this application scene, it is preferred that lens group 150 is gradient-index lens.Gradient-index lens are also known as change
Index lens or non-uniform dielectric lens, gradient-index lens can include axial gradient index lens, gradient
Index lens and layered gradient index lens.Wherein, the refractive index of axial gradient index lens is axially varying, waits folding
The rate face of penetrating is perpendicular to the parallel plane system of optical axis；The refractive index of radial gradient index lens radially changes, etc. refractive index
Face is face of cylinder system substantially symmetrical about its central axis；The refractive index of layered gradient index lens becomes along perpendicular to a certain plane containing optical axis
Change, etc. the plane system that refractive index face is parallel to optical axis.
It is preferred that, the gradient-index lens that the present embodiment is used are the selfoc lens array of gradient refraction, are shown
Example property, Fig. 3 is the gradient-index lens imaging schematic diagram in the utility model embodiment one, as shown in figure 3, cover-plate glass
On fingerprint 301 on the near infrared lights that are reflected back of a point B reach after gradient-index lens 302, by gradient-index lens
302 focus on and are imaged onto on photo-sensitive cell 160, form picture point B ', similarly, other points on fingerprint 301 are also with same imaging
Principle is imaged on photo-sensitive cell 160 by gradient-index lens.Plane and gradient-index lens where photo-sensitive cell 160
302 focal plane is overlapped.
Photo-sensitive cell 160 can be Charged Couple (Charge-coupled Device, CCD) sensor devices or complementation
Metal-oxide semiconductor (MOS) (Complementary Metal Oxide Semiconductor, CMOS) photo-sensitive cell, CCD senses
Optical device and CMOS are that the conversion of light and electricity is carried out using the photosensitive diode of silicon (Photodiode, PD).Wherein,
The operation principle of CCD sensor devices is that, when CCD surfaces are irradiated by light, light can be converted into electric charge, institute by photosensitive unit
The signal that some photosensitive units are produced constitutes complete imaging, is then converted into data signal and carries out subsequent treatment；CMOS is photosensitive
The operation principle of element is that the semiconductor made using two kinds of elements of silicon and germanium makes to co-exist band N (band-electricity) and P on CMOS
The semiconductor of (band+electricity) level, the processed chip of electric current produced by the two complementary effects is parsed into image.
Under this application scene, the fingerprint imaging principle of optical system is, the near infrared light pair produced by lighting module 130
The fingerprint acted on cover-plate glass 110 is illuminated, illuminated fingerprint nearly infrared light reflection, the near infrared light being reflected back
Enter lens group 150 after being filtered by near infrared light optical filter 140, the near infrared light meeting coalescence after 150 pairs of lens group filters is imaged,
The fingerprint image of formation is sensed by photo-sensitive cell 160.
The technical scheme that the present embodiment is provided, the optical system of fingerprint imaging includes：Cover-plate glass, for encapsulating and protecting
Optical system；Light emitting display, is arranged at below cover-plate glass, for producing RGB rgb light and display image；Illuminate mould
Block, is arranged at below light emitting display, including near infrared light light source and light guide plate, for illuminating light emitting display and fingerprint；Closely
Infrared light optical filter, is arranged at below lighting module, for filtering out rgb light；Lens group, is arranged under near infrared light optical filter
Side, filters out the near infrared light after rgb light and imaging for assembling near infrared light optical filter, forms fingerprint image；Photo-sensitive cell, if
It is placed in below lens group, the fingerprint image for sensing lens group formation.Fingerprint imaging principle is the near red of lighting module generation
Outer light is illuminated to the fingerprint being positioned on cover-plate glass, illuminated fingerprint nearly infrared light reflection, and what is be reflected back is near red
Outer light is filtered through near infrared light optical filter, and RGB therein is filtered into reservation near infrared light, after near infrared light optical filter
Near infrared light is assembled by lens group and is imaged, and formed fingerprint image is sensed by photo-sensitive cell.The optical imaging system application
In mobile terminal, realize the fingerprint imaging of mobile terminal full screen, improve the durability of fingerprint imaging system, reduction fingerprint into
As cost in the terminal and energy consumption.
Embodiment two
Fig. 3 is the cross section structure schematic diagram of the optical system for the fingerprint imaging that the utility model embodiment one is provided, the above
Based on stating embodiment, as shown in figure 3, the optical system of the fingerprint imaging also includes：First polarized light piece 170 and the second polarization
Mating plate 180.
First polarized light piece 170, is arranged at the lower section of cover-plate glass 110 and light emitting display 120, for adjusting rgb light
Polarization direction；
Second polarized light piece 180, sets the lower section of the first polarized light piece 170 and the top of light emitting display 120, for adjusting
The polarization direction of rgb light.
Polarized light piece can have the optical thin film for producing polarised light function by layer high molecule Material cladding.
In this application off field, the first polarized light piece 170 and the cooperating of the second polarized light piece 180 cause the screen display figure of mobile terminal
Picture.
It is preferred that, the optical system of fingerprint imaging also includes brightening piece, and brightening piece is arranged at the lower section of the second polarized light piece 180
With the top of light emitting display 120, the light produced by light emitting display 120 can be strengthened.
It is preferred that, the optical system of fingerprint imaging also includes substrate glass, is arranged at the lower section of light emitting display 120 and near red
The outer top of smooth optical filter 140, for being used as the substrate of lighting module 130.
The technical scheme of the present embodiment, the optical system also includes：First polarized light piece, be arranged at below cover-plate glass and
Above light emitting display, the polarization direction for adjusting rgb light, the second polarized light piece, be arranged at below the first polarized light piece and
Above light emitting display, the polarization direction for adjusting rgb light.First polarizer and the second polarizer are used cooperatively so that moved
The normal display image of screen of dynamic terminal.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from protection domain of the present utility model.Therefore, although pass through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, other more equivalent embodiments can also be included, and scope of the present utility model is by appended
Right determine.
Claims (9)
1. a kind of optical system of fingerprint imaging, it is characterised in that the optical system of the fingerprint imaging is applied to mobile terminal
In, including：
Cover-plate glass, for encapsulating and protecting the optical system；
Light emitting display, is arranged at below the cover-plate glass, for producing RGB rgb light and display image；
Lighting module, is arranged at below the light emitting display, including near infrared light light source and light guide plate, for illuminating the hair
Light display screen and fingerprint；
Near infrared light optical filter, is arranged at below the lighting module, for filtering out the rgb light；
Lens group, is arranged at below the near infrared light optical filter, the RGB is filtered out for assembling the near infrared light optical filter
Near infrared light and imaging after light, form fingerprint image；
Photo-sensitive cell, is arranged at below the lens group, the fingerprint image for sensing the lens group formation.
2. the optical system of fingerprint imaging according to claim 1, it is characterised in that the light emitting display is liquid crystal
Display screen LCD.
3. the optical system of fingerprint imaging according to claim 1, it is characterised in that the light emitting display is luminous two
Pole pipe display screen OLED.
4. the optical system of fingerprint imaging according to claim 1, it is characterised in that the lens group is lenticule battle array
Row.
5. the optical system of fingerprint imaging according to claim 1, it is characterised in that the lens group is graded index
Lens.
6. the optical system of fingerprint imaging according to claim 5, it is characterised in that the gradient-index lens are footpaths
To the selfoc lens array of gradient refractive index.
7. the optical system of fingerprint imaging according to claim 1, it is characterised in that also include：
First polarized light piece, is arranged at below the cover-plate glass and above the light emitting display, for adjusting the rgb light
Polarization direction；
Second polarized light piece, is arranged at below first polarized light piece and above the light emitting display, described for adjusting
The polarization direction of rgb light.
8. the optical system of fingerprint imaging according to claim 7, it is characterised in that also include：
Brightening piece, is arranged at below second polarized light piece and above the light emitting display, for strengthening by described luminous
The light that display screen is produced.
9. the optical system of fingerprint imaging according to claim 1, it is characterised in that also include：
Substrate glass, is arranged at below the light emitting display and above the near infrared filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720165120.6U CN206470786U (en) | 2017-02-23 | 2017-02-23 | A kind of optical system of fingerprint imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720165120.6U CN206470786U (en) | 2017-02-23 | 2017-02-23 | A kind of optical system of fingerprint imaging |
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| Publication Number | Publication Date |
|---|---|
| CN206470786U true CN206470786U (en) | 2017-09-05 |
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ID=59707244
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720165120.6U Expired - Fee Related CN206470786U (en) | 2017-02-23 | 2017-02-23 | A kind of optical system of fingerprint imaging |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108446677A (en) * | 2018-05-03 | 2018-08-24 | 东莞市美光达光学科技有限公司 | A kind of fingerprint recognition module for below screen |
| CN110175494A (en) * | 2018-07-06 | 2019-08-27 | 神盾股份有限公司 | Optical finger print sensing device |
| WO2020113839A1 (en) * | 2018-12-06 | 2020-06-11 | 武汉华星光电半导体显示技术有限公司 | Display apparatus with under-display fingerprint recognition function, and electronic apparatus |
| WO2021056413A1 (en) * | 2019-09-27 | 2021-04-01 | 京东方科技集团股份有限公司 | Display panel and manufacturing method therefor, and display device |
-
2017
- 2017-02-23 CN CN201720165120.6U patent/CN206470786U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108446677A (en) * | 2018-05-03 | 2018-08-24 | 东莞市美光达光学科技有限公司 | A kind of fingerprint recognition module for below screen |
| CN110175494A (en) * | 2018-07-06 | 2019-08-27 | 神盾股份有限公司 | Optical finger print sensing device |
| WO2020113839A1 (en) * | 2018-12-06 | 2020-06-11 | 武汉华星光电半导体显示技术有限公司 | Display apparatus with under-display fingerprint recognition function, and electronic apparatus |
| WO2021056413A1 (en) * | 2019-09-27 | 2021-04-01 | 京东方科技集团股份有限公司 | Display panel and manufacturing method therefor, and display device |
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Granted publication date: 20170905 Termination date: 20200223 |