CN207557977U - Optical path modulation device, fingerprint identification device and terminal device - Google Patents
Optical path modulation device, fingerprint identification device and terminal device Download PDFInfo
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- CN207557977U CN207557977U CN201721678580.5U CN201721678580U CN207557977U CN 207557977 U CN207557977 U CN 207557977U CN 201721678580 U CN201721678580 U CN 201721678580U CN 207557977 U CN207557977 U CN 207557977U
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Abstract
This application discloses a kind of optical path modulation devices, the optical path modulation device includes upper surface, lower surface and the through-hole array being formed between the upper surface and the lower surface, the through-hole array includes multiple inclined via-holes, the angle of inclination of wherein each inclined via-hole is more than 0 °, the axis direction and the angle between the optical path modulation device normal to a surface direction that the angle of inclination is the inclined via-hole.Since the optical path modulation utensil is by the through-hole array being made of inclined via-hole, in the case of identical hole depth, the thickness of thinner optical path modulation device can be obtained.Also, it by adjusting the angle of inclination of the inclined via-hole inside optical path modulation device, can effectively change the propagation path and angle of light path, make its modulation to light path more flexible.
Description
Technical field
This application involves technical field of biometric identification, more particularly, to a kind of optical path modulation device, fingerprint identification device and
Terminal device.
Background technology
With the extensive use shielded with large-size screen monitors accounting comprehensively, mobile terminal gets over the design requirement for shielding lower fingerprint recognition
Come more；Conventional condenser fingerprint identification technology faces the limitation of penetration capacity, it is difficult to the fingerprint recognition system under screen is applied, and
Optical fingerprint identification technology can preferably breach the limitation of display screen and thickness of glass, thus with preferable application before
Scape.
Optical fingerprint identification system generally use optical path modulator (abbreviation optical path modulation device below) is to transmitting downwards
Light guided, realize and the reflected light that finger reflects be directed to optical detection unit, so as to optical detection unit utilize
Finger lines can get the reflection differences of light fingerprint image, and according to the matching verification to fingerprint feature point, in terminal
Fingerprint recognition is realized on equipment such as mobile phone.However, the slimming of terminal device is for shielding the whole thick of lower optical finger print module
Degree has more strict requirements, and be limited by current semiconductor etching process, limits optical path modulation to a certain extent
The optical path modulation and optical imaging effect of device.
Utility model content
The embodiment of the present application provides a kind of optical path modulation device, fingerprint identification device and terminal device, can ensure have
While the optical path modulation of effect, there is smaller thickness.
In a first aspect, providing a kind of optical path modulation device, the optical path modulation device includes upper surface, lower surface and formation
Through-hole array between the upper surface and the lower surface, the through-hole array includes multiple inclined via-holes, wherein each
The angle of inclination of inclined via-hole is more than 0 °, and the angle of inclination is for the axis direction of the inclined via-hole and perpendicular to the light path
Angle between the normal direction of modulator surface.
Therefore, the optical path modulation utensil of the embodiment of the present application is by the through-hole array being made of inclined via-hole, in identical hole depth
In the case of, the optical path modulation utensil can be made to have smaller thickness.In other words, inclined via-hole is ensureing that identical hole depth is wide
Than in the case of, the thickness of thinner optical path modulation device can be obtained.Also, lead to by adjusting the inclination inside optical path modulation device
The angle of inclination in hole can effectively change the propagation path and angle of light path, make its modulation to light path more flexible.
In some possible realization methods, the angle of inclination of the inclined via-hole is more than 0 ° and less than 40 °.
In some possible realization methods, the inclined via-hole is circular through hole, ellipse hole or square through hole.
In some possible realization methods, the optical path modulation device is formed in silicon chip, silicon carbide substrate, oxidation silicon substrate
Piece or nitride substrate.
Second aspect provides a kind of fingerprint identification device, including optical path modulation device and is arranged on the optical path modulation
Optical detection unit below device, wherein, the optical path modulation device includes substrate and is formed in the substrate and runs through described
The through-hole array of substrate, the through-hole array include multiple inclined via-holes, wherein the angle of inclination of each inclined via-hole is more than 0 °,
The angle of inclination is for the axis direction of the inclined via-hole and between the optical path modulation device normal to a surface direction
Angle.
In some possible realization methods, the angle of inclination of the inclined via-hole of the optical path modulation device is more than 0 ° and is less than
40°。
In some possible realization methods, the optical detection unit includes the sensing with multiple optical sensor units
Array, wherein incident light is directed to optical sensor unit below by the inclined via-hole.
In some possible realization methods, each inclined via-hole of the optical path modulation device corresponds to the sensing respectively
One of optical sensor unit of array.
In some possible realization methods, the inclined via-hole of the optical path modulation device and the optics sense of the induction arrays
It is non-one-to-one relationship to answer unit.
In some possible realization methods, each optical sensor units of the induction arrays corresponds respectively to described
Multiple inclined via-holes of optical path modulation device.
In some possible realization methods, the inclined via-hole of the optical path modulation device by the way of irregular alignment come
It realizes with unspecific correspondence between the optical sensor unit of the induction arrays.
In some possible realization methods, the fingerprint identification device further includes filter layer, the filter layer with it is described
Optical path modulation device overlaps.
In some possible realization methods, the optical path modulation device and the optical detection unit are encapsulated in same light
Learn fingerprint chip.
The third aspect provides a kind of terminal device, which includes display screen and above-mentioned second aspect or the
Fingerprint identification device in the arbitrary possible realization method of two aspects, wherein, the fingerprint identification device is arranged on described aobvious
The lower section of display screen.
In some possible realization methods, the display screen is self light emitting display panel, and the fingerprint identification device is adopted
The excitation light source detected by the use of the spontaneous light display unit of the self light emitting display panel as optical finger print, and the fingerprint recognition fills
The fingerprint recognition region put is located at least part display area of the display screen.
Description of the drawings
Fig. 1 is the structure diagram for the terminal device that the embodiment of the present application can be applicable in.
Fig. 2 is a specific schematic diagram of the optical finger print device in Fig. 1.
Fig. 3 is the schematic diagram according to the optical path modulation device of the embodiment of the present application.
Fig. 4 is the schematic block diagram of the finger print detection device of the embodiment of the present application.
Specific embodiment
Below in conjunction with attached drawing, the technical solution in the embodiment of the present application is described.
It should be understood that the embodiment of the present application can be applied to optical fingerprint systems, including but not limited to optical finger print identification system
System and the medical diagnostic products etc. based on optical finger print imaging, the embodiment of the present application is only said by taking optical fingerprint systems as an example
It is bright, but any restriction should not be formed to the embodiment of the present application, the embodiment of the present application is equally applicable to other using optical imagery skill
System of art etc..
As a kind of common application scenarios, the invention relates to fingerprint identification method, fingerprint identification device with
And fingerprint recognition chip can apply smart mobile phone, tablet computer and other with the mobile terminal of display screen or other
Terminal device；More specifically, in above-mentioned terminal device, fingerprint recognition system can be specially optical fingerprint systems, can be with
The regional area or whole region being arranged below display screen, so as to form (Under-display) optical finger print system under screen
System.
The structure diagram of terminal device that can be applicable in for the embodiment of the present application as shown in Figure 1, the terminal device 100
Optical fingerprint systems include display screen 120 and optical finger print device 130, wherein, the optical finger print device 130 is arranged at
The regional area of 120 lower section of display screen.The optical finger print device 130 can be specially optical fingerprint sensor, packet
The induction arrays with multiple optical sensor units are included, the induction arrays region is the optical finger print device 130
Fingerprint recognition region 103.As shown in Figure 1, the fingerprint recognition region 103 be located at the display screen 120 display area 102 it
In, therefore, user is when needing to be unlocked the terminal device or other fingerprint authentications, it is only necessary to by finger
It is pressed on positioned at the fingerprint recognition region 103 of the display screen 120, can realize that fingerprint inputs.Since fingerprint detection can be with
It is realized in screen, therefore terminal device 100 using the above structure sets fingerprint button without the special reserved space in its front
(such as Home key), so as to which using screen scheme comprehensively, i.e., the display area 102 of described display screen 120 can extend substantially
To the front of entire terminal device 100.
As in a kind of preferred embodiment, the display screen 120 can be self light emitting display panel, use with spontaneous
The conduct display pixel of light display unit, such as Organic Light Emitting Diode (Organic Light-Emitting Diode,
OLED) display screen or micro-led (Micro-LED) display screen.For using OLED display screen, the optics
Fingerprint device 130 can be located at the OLED display unit in the fingerprint recognition region 103 (i.e. using the OLED display screen 120
OLED light source) it is used as the excitation light source of optical finger print detection.Also, the induction arrays of the optical finger print device 130 are specific
For optical detector (Photo detector) array, including multiple optical detectors in array distribution, the optical detector
Optical sensor unit as described above can be used as.When finger touch, pressing or close to (for ease of description, the application is referred to as
To touch) at the fingerprint recognition region 103, the light that the display unit in the fingerprint recognition region 103 is sent out is in finger
The fingerprint on surface occurs to reflect and forms reflected light, wherein the reflected light of the wrinkle ridge of the finger print and line paddy is different,
Reflected light is received and converted to corresponding electric signal from the display screen 120 and by the photodetector array, i.e. fingerprint is examined
Survey signal.Fingerprint image data can be obtained, and can further carry out fingerprint matching based on the fingerprint detection signal
Verification, so as to realize optical finger print identification function in the terminal device 100.
In other alternate embodiments, the optical finger print device 130 can also be arranged on 120 lower section of display screen
Whole region, it is real so as to which the fingerprint recognition region 103 to be expanded to the entire display area 102 of the entire display screen 120
Existing full frame fingerprint detection.Make a reservation for alternatively, the optical finger print device 130 can also be arranged on inside the terminal device 100
Region, such as the fringe region of the terminal device 100, and light guide structure is set by finger below the display screen 120
The reflected light on surface directs into the induction arrays of the optical finger print device 130.
It should be understood that in specific implementation, the terminal device 100 further includes transparency protected cover board 110, the lid
Plate 110 can be specially transparent cover plate, such as glass cover-plate or sapphire cover board, be located at the top of the display screen 120
And cover the front of the terminal device 100.Therefore, in the embodiment of the present application, so-called finger is touched, presses or is approached
The display screen 120 actually refer to finger touch, pressing either close to above the display screen 120 cover board 110 or
Cover the protective layer of the cover board 110.In addition, the terminal device 100 can also include touch sensor, the touch
Sensor can be specially touch panel, can be arranged on 120 surface of display screen, can also partially or wholly integrate
To inside the display screen 120, i.e., described display screen 120 is specially touching display screen.
As a kind of optional realization method, as shown in Figure 1, the optical finger print device 130 includes optical detection unit
134 and optical module 132, the optical detection unit 134 includes the induction arrays and electrically connects with the induction arrays
The reading circuit connect and other auxiliary circuits can be produced on a chip (Die) by semiconductor technology；The optics
Component 132 can be arranged on the top of the induction arrays of the optical detection unit 134, can specifically include filter layer
(Filter), optical path modulation device and other optical elements, the filter layer can be used for filtering out the ambient light for penetrating finger, and
The through-hole array with high-aspect-ratio may be used in the optical path modulation device, is mainly used for collimating the light propagated downwards
With modulation etc., realize that being directed to the induction arrays from the reflected reflected light of finger surface carries out optical detection.
Fig. 2 shows the optical finger print device 130 in Fig. 1, including optical module 132 and optical detection unit 134,
Optical module 132 includes optical path modulation device and filter layer, to be detected finger of the light that display screen is sent out above the display screen
Surface is reflected, the optical path modulation device by its through-hole array to from the reflected reflected light of finger surface carry out collimation and
Modulation, and reflected light is directed to filter layer, which is received after the filtering of filter layer by optical detection unit 134,
Optical detection unit 134 can further be detected the reflected light received, to realize fingerprint recognition.It should be appreciated that
Optical finger print device 130 shown in Fig. 2 is only a kind of illustrative structure, in specific implementation, the optical filtering of the optical module 132
The position of layer is not limited in the lower section of optical path modulation device；For example, in a kind of alternate embodiment, which can also be set
Between optical path modulation device and display screen, i.e., above optical path modulation device；Alternatively, optical module 132 can include two layers of filter
Photosphere, the two are separately positioned on above and below optical path modulation device.In other alternate embodiments, which can also collect
Into to inside optical path modulation device, possibly even dispense, the application is without limitation.
In specific implementation, the optical module 132 can be encapsulated in same optics with the optical detection unit 134
Fingerprint chip or as with the relatively independent component of optical detection unit 134 be mounted on optical finger print module internal.Its
In, the optical path modulation device can be specially semi-conductor silicon chip or Si oxide (such as silica) or nitride (such as
Silicon nitride) collimator (Collimator) layer for being made either lens (Lens) layer its with multiple collimation units or
Lens unit, the collimation unit or lens unit can be as the modulation units of optical path modulation device, specifically, the modulation
Unit can be specially the aperture with high-aspect-ratio, from the reflected reflected light of finger, be incident on the modulation unit
Light can be received to pass through and by optical sensor unit below, each optical sensor unit can substantially receive
Aperture above it is guided over the reflected light of the fingerprint lines come, so as to which the induction arrays can detect the fingerprint of finger
Image.
In the optical finger print device 130, each modulation unit of optical path modulation device can correspond to the sense respectively
Answer one of optical sensor unit of array；Alternatively, the modulation unit is with the optical sensor list of the induction arrays
Can also Moire fringe interference be generated, for example an optical sensor unit can to reduce using non-one-to-one relationship between member
To correspond to multiple modulation units, alternatively, the modulation unit can also be realized by the way of irregular alignment with described
Do not have specific correspondence between the optical sensor unit of induction arrays.When the modulation unit of the optical path modulation device uses
During irregular alignment mode, the optical finger print device 130 can examine each sensing unit by later stage software algorithm
The reflection light measured is corrected.
Fig. 3 show the optical path modulation device 300 of the embodiment of the present application, which can be applied to fingerprint knowledge
Other device such as Fig. 1 and optical finger print device 130 shown in Fig. 2, are used as between display screen and optical detection unit 134
Optical path modulation device.The optical path modulation device 300, which can be used for be directed to from the reflected reflected light of finger surface, is arranged on this
The optical detection unit of 300 lower section of optical path modulation device, the optical detection unit can be used for carrying out the reflected light received
Detect the fingerprint image to obtain finger.
Wherein, as shown in figure 3, the optical path modulation device 300 include upper surface, lower surface and be formed in the upper surface with
Through-hole array between the lower surface.The through-hole array includes multiple inclined via-holes, wherein each inclined via-hole can conduct
The modulation unit of the optical path modulation device 300, for the reflection of the optical detection unit propagation of opposite 300 lower section of optical path modulation device
Light is collimated and is modulated.Specifically, the axis direction of each inclined via-hole in the through-hole array with perpendicular to the light path tune
Angle a between the normal direction of device processed is more than 0 °.Lead to for ease of description, above-mentioned angle a is defined as described tilt by the application
The angle of inclination a at the angle of inclination in hole, the i.e. through-hole array of the optical path modulation device 300 is more than 0 °.It is in addition, it will be appreciated that above-mentioned
Collimation actually refer to be guided light so that by the optical path modulation device 300 each through-hole reflected light with pre-
Determining angle, (the i.e. above-mentioned angle a) for being more than 0 ° is obliquely incident on the induction arrays of the optical detection unit.
Preferably, the angle of inclination a of the inclined via-hole meets 0 ° of 40 ° of ＜ a ＜.
The material of the optical path modulation device 300 is light tight to wave band corresponding used in the fingerprint identification device, such as the light
The material of road modulator can be silicon, the carbide of silicon, the oxide of silicon or nitride etc..
Optionally, the inclined via-hole in the through-hole array of the optical path modulation device 300 can be circular through hole, ellipse hole
Or square through hole；Or the through-hole of other any shapes, the application are not construed as limiting this.
Therefore, the optical path modulation utensil of the embodiment of the present application is by the through-hole array being made of inclined via-hole, in identical hole depth
In the case of, the optical path modulation utensil can be made to have smaller thickness.In other words, inclined via-hole is ensureing that identical hole depth is wide
Than in the case of, the thickness of thinner optical path modulation device can be obtained.Also, lead to by adjusting the inclination inside optical path modulation device
The angle of inclination in hole can effectively change the propagation path and angle of light path, make its modulation to light path more flexible.
On the other hand, it is provided in this embodiment using with inclination angle compared to the optical path modulation device using vertical through hole
The through-hole of degree is used as the modulation unit of optical path modulation device 300, can also avoid from the reflected reflected light of finger surface
The optical detection unit of 300 lower section of optical path modulation device is directly impinged perpendicularly on, and to making an uproar during above-mentioned reflected light pass
Sound is effectively inhibited, and improves the signal-to-noise ratio of the finger print detection device, so as to be effectively improved fingerprint imaging effect.
Fig. 4 shows the schematic block diagram of the fingerprint identification device 400 of the embodiment of the present application.The fingerprint identification device 400
Mobile terminal device as shown in Figure 1 or 2 is can be applied to, as shown in figure 4, the fingerprint identification device 400 includes light path tune
Device 410 processed and the optical detection unit 420 for being arranged on 410 lower section of optical path modulation device.The optical path modulation device 410 for example may be used
Think the optical path modulation device 300 shown in earlier figures 3.
The optical path modulation device 410 includes substrate and is formed in the substrate and runs through the through-hole array of the substrate, institute
It states through-hole array and includes multiple inclined via-holes, wherein the angle of inclination of each inclined via-hole is more than 0 °, the angle of inclination is institute
The axis direction and the angle between the optical path modulation device normal to a surface direction for stating inclined via-hole.
Optionally, the angle of inclination of the inclined via-hole of the optical path modulation device is more than 0 ° and less than 40 °.
Optionally, the optical detection unit includes the induction arrays with multiple optical sensor units, wherein described incline
Incident light is directed to optical sensor unit below by oblique through-hole.
Optionally, each inclined via-hole of the optical path modulation device corresponds to one of light of the induction arrays respectively
Learn sensing unit.
Optionally, the inclined via-hole of the optical path modulation device and the optical sensor unit of the induction arrays are a pair of for non-one
The relationship answered.
Optionally, each optical sensor unit of the induction arrays corresponds respectively to the multiple of the optical path modulation device
Inclined via-hole.
Optionally, the inclined via-hole of the optical path modulation device is realized by the way of irregular alignment with the sensing battle array
Unspecific correspondence between the optical sensor unit of row.
Optionally, the fingerprint identification device further includes filter layer, and the filter layer thinks highly of folded set with the optical path modulation
It puts.
Optionally, the optical path modulation device and the optical detection unit are encapsulated in same optical finger print chip.
The embodiment of the present application additionally provides a kind of terminal device, which can include display screen and above-mentioned the application
Any one fingerprint identification device in embodiment, wherein, the fingerprint identification device is arranged on the lower section of the display screen.
It is equipped with it should be understood that the terminal device in the embodiment of the present application can be mobile phone, tablet computer, laptop etc.
The electronic equipment of fingerprint identification device, such as can be the mobile phone for being equipped with fingerprint recognition chip.
Those of ordinary skill in the art may realize that each exemplary lists described with reference to the embodiments described herein
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is performed with hardware or software mode, specific application and design constraint depending on technical solution.Professional technician
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
Scope of the present application.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit can refer to the corresponding process in preceding method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit is drawn
Point, only a kind of division of logic function can have other dividing mode, such as multiple units or component can in actual implementation
To combine or be desirably integrated into another system or some features can be ignored or does not perform.Another point, it is shown or beg for
The mutual coupling, direct-coupling or communication connection of opinion can be the INDIRECT COUPLING by some interfaces, device or unit
Or communication connection, can be electrical, machinery or other forms.
This may or may not be physically separate as the unit that separating component illustrates, be shown as unit
Component may or may not be physical unit, you can be located at a place or multiple nets can also be distributed to
On network unit.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the application can be integrated in a detection unit, it can also
That each unit is individually physically present, can also two or more units integrate in a unit.
More than, the only specific embodiment of the application, but the protection domain of the embodiment of the present application is not limited thereto is appointed
In the technical scope what those familiar with the art discloses in the embodiment of the present application, variation can be readily occurred in or replaced
It changes, should all cover and be suitble within the protection domain of private interests in the application.Therefore, the protection domain of the embodiment of the present application should be with power
Subject to the protection domain of profit requirement.
Claims (15)
1. a kind of optical path modulation device, which is characterized in that the optical path modulation device includes upper surface, lower surface and is formed in described
Through-hole array between upper surface and the lower surface, the through-hole array include multiple inclined via-holes, wherein each tilt is led to
The angle of inclination in hole is more than 0 °, and the angle of inclination is for the axis direction of the inclined via-hole and perpendicular to the optical path modulation device
Angle between normal to a surface direction.
2. optical path modulation device according to claim 1, which is characterized in that the angle of inclination of the inclined via-hole be more than 0 ° and
Less than 40 °.
3. optical path modulation device according to claim 1 or 2, which is characterized in that the inclined via-hole is circular through hole, ellipse
Shape through-hole or square through hole.
4. optical path modulation device according to claim 1 or 2, which is characterized in that the optical path modulation device be formed in silicon chip,
Silicon carbide substrate, oxidation silicon chip or nitride substrate.
5. a kind of fingerprint identification device, which is characterized in that including optical path modulation device and be arranged below the optical path modulation device
Optical detection unit, the optical path modulation device include substrate and be formed in the substrate and through the substrate through-hole battle array
Row, the through-hole array include multiple inclined via-holes, wherein the angle of inclination of each inclined via-hole is more than 0 °, the angle of inclination
Axis direction for the inclined via-hole and the angle between the optical path modulation device normal to a surface direction.
6. fingerprint identification device according to claim 5, which is characterized in that the inclined via-hole of the optical path modulation device inclines
Rake angle is more than 0 ° and less than 40 °.
7. fingerprint identification device according to claim 6, which is characterized in that the optical detection unit includes having multiple
The induction arrays of optical sensor unit, wherein incident light is directed to optical sensor unit below by the inclined via-hole.
8. fingerprint identification device according to claim 7, which is characterized in that each of the optical path modulation device tilts logical
Hole corresponds to one of optical sensor unit of the induction arrays respectively.
9. fingerprint identification device according to claim 7, which is characterized in that the inclined via-hole of the optical path modulation device and institute
The optical sensor unit for stating induction arrays is non-one-to-one relationship.
10. fingerprint identification device according to claim 9, which is characterized in that each optics sense of the induction arrays
Unit is answered to correspond respectively to multiple inclined via-holes of the optical path modulation device.
11. fingerprint identification device according to claim 9, which is characterized in that the inclined via-hole of the optical path modulation device is adopted
Unspecific correspondence between the optical sensor unit with the induction arrays is realized with the mode of irregular alignment.
12. fingerprint identification device according to claim 7, which is characterized in that the fingerprint identification device further includes optical filtering
Layer, the filter layer are overlapped with the optical path modulation device.
13. fingerprint identification device according to claim 7, which is characterized in that the optical path modulation device and optics inspection
It surveys unit and is encapsulated in same optical finger print chip.
A kind of 14. terminal device, which is characterized in that the finger including display screen and as described in any one of claim 5 to 13
Line identification device, wherein, the fingerprint identification device is arranged on the lower section of the display screen.
15. terminal device according to claim 14, which is characterized in that the display screen is self light emitting display panel, and institute
The excitation light source that fingerprint identification device is detected using the spontaneous light display unit of the self light emitting display panel as optical finger print is stated,
And the fingerprint recognition region of the fingerprint identification device is located at least part display area of the display screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721678580.5U CN207557977U (en) | 2017-12-05 | 2017-12-05 | Optical path modulation device, fingerprint identification device and terminal device |
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| CN201721678580.5U CN207557977U (en) | 2017-12-05 | 2017-12-05 | Optical path modulation device, fingerprint identification device and terminal device |
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