CN106529487A - Optical fingerprint sensor module - Google Patents
Optical fingerprint sensor module Download PDFInfo
- Publication number
- CN106529487A CN106529487A CN201611016703.9A CN201611016703A CN106529487A CN 106529487 A CN106529487 A CN 106529487A CN 201611016703 A CN201611016703 A CN 201611016703A CN 106529487 A CN106529487 A CN 106529487A
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- China
- Prior art keywords
- light
- protective layer
- groove
- fingerprint sensor
- optical fingerprint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
Abstract
An optical fingerprint sensor module comprises a protection layer, an optical fingerprint sensor, and a backlight source, wherein the optical fingerprint sensor is located below the protection layer; the lower surface of the protection layer is provided with an upward concave groove, and the groove is provided with a top part; and the backlight source is located in the groove, and light emitted from the backlight source enters the protection layer form at least one surface of the groove. The performance of the optical fingerprint sensor module is improved, and the quality of a fingerprint image acquired by adopting the optical fingerprint sensor module is improved.
Description
Technical field
A kind of the present invention relates to optical finger print identification field, more particularly to optical fingerprint sensor module.
Background technology
Fingerprint imaging technology of identification, is the fingerprint image for collecting human body by fingerprint sensor, then with system in
Existing fingerprint imaging information is compared, and whether carrys out correct judgment, and then realizes the technology of identification.Due to the side which uses
The uniqueness of just property, and somatic fingerprint, fingerprint identification technology have been widely used in every field.Such as public security bureau, customs
Etc. field of safety check, consumer product area such as the gate control system of building, and PC and mobile phone etc..
The implementation of fingerprint imaging technology of identification has the multiple technologies such as optical imagery, capacitance imaging, ultra sonic imaging.Relatively
For, optical finger print imaging technique, its imaging effect are relatively preferable, and equipment cost is relatively low.
The structure of existing optical fingerprint sensor module has much room for improvement, and performance has much room for improvement.
The content of the invention
The problem that the present invention is solved is to provide a kind of optical fingerprint sensor module, to improve the optical fingerprint sensor
The performance of module, so that improve the fingerprint image quality obtained using the optical fingerprint sensor module.
For solving the above problems, the present invention provides a kind of optical fingerprint sensor module, including：Protective layer；Optical finger print
Sensor, the optical fingerprint sensor are located at below the protective layer；Backlight；The protective layer lower surface has concave up
The groove for entering, the groove have top；The backlight is located in the groove, and the light that the backlight sends is from described
At least one of which surface of groove enters the protective layer.
Optionally, in the surface of the groove, it is first surface to the minimum surface of optical fingerprint sensor distance,
The light that the backlight sends enters the protective layer from the first surface.
Optionally, the top surface of the groove is parallel with the upper and lower surface of the protective layer；Described first
Surface is plane, and the angle of the lower surface of the top surface and the protective layer of the first surface and the groove is all straight
Angle.
Optionally, the top surface of the groove is parallel with the upper and lower surface of the protective layer；Described first
Surface is plane, and the angle of the lower surface of the top surface and the protective layer of the first surface and the groove is all blunt
Angle.
Optionally, the first surface is concave curved surface, and the top surface of the top edge of the concave curved surface and the groove connects
Connect, the lower limb of the concave curved surface is connected with the lower surface of the protective layer.
Optionally, the first surface has light antireflection layer, and the smooth antireflection layer can increase the light of the backlight
Into the ratio of the protective layer.
Optionally, in the upper surface of the protective layer, with the backlight just to part there is light shield layer；Or, institute
The top surface for stating groove has light shield layer；Or, the upper surface of the protective layer and the backlight just to part have
Light shield layer, and the top surface of the groove also has light shield layer.
Optionally, the backlight includes at least one LED, and the light of the LED is black light, purple light, indigo plant
Coloured light, green light, sodium yellow, red light, near infrared light or white light.
Optionally, the backlight includes plural LED, and the LED is respectively positioned in the groove, described
The light of LED is black light, purple light, blue light, green light, sodium yellow, red light, near infrared light or white light.
Optionally, the number of the groove is equal with the number of the LED, and a LED is positioned at described in one
In groove, the groove is evenly distributed in the protective layer.
Optionally, there is between the backlight and the first surface light transmission medium, the light of the backlight is advanced
Enter the light transmission medium protective layer is entered from the first surface again.
Compared with prior art, technical scheme has advantages below：
In technical scheme, protective layer has upwardly recessed groove, and backlight is arranged on recessed in protective layer
In groove, so that the integrated model of whole optical fingerprint sensor module is simpler, thickness can be made to thinner.Backlight
When the light that source sends enters protective layer by the first surface of groove, respective ray of light refers to for contacting with protective layer upper surface
Angle formed by the region of stricture of vagina is acute angle.Now, the light that backlight sends can be by corresponding side-play amount table on the protection layer
There is the phenomenon such as reflection and refraction in the interface of face and finger print, and make most of effectively reflection light be irradiated to optical finger print biography
In the photosensitive region of sensor, therefore, whole optical fingerprint sensor module does not need the structures such as light guide plate, it becomes possible to realize fingerprint
The identification of image, forms clearly fingerprint image, and simplifies structure, reduce cost.
At the same time, on the one hand, backlight be located at protective layer in groove in, therefore, backlight is to protective layer upper surface
Distance it is less, this also cause backlight light reach protective layer upper surface when, with the normal perpendicular to protective layer upper surface
Between angle increase；On the other hand, refraction can occur when light enters first surface, such that it is able to increase above-mentioned folder again
Angle.The angle increase brings following two advantages again：First, the ray regions width for being reflected into optical fingerprint sensor increases
Greatly, the photosensitive region of optical fingerprint sensor can be better profited from；Second, corresponding light can on the protection layer surface and
Total reflection can occur in the interface of air, and then normally carry out with the interface of protective layer upper surface in finger print spine
The optical phenomena such as reflection and refraction, now, contrast can be bright for the diverse location (i.e. paddy position and ridge position) of finger print image
Aobvious to improve, fingerprint image quality is improved.
Description of the drawings
Fig. 1 is a kind of structural representation of optical fingerprint sensor module；
Fig. 2 is the overlooking the structure diagram of the optical fingerprint sensor module provided by first embodiment of the invention；
Fig. 3 is the optical fingerprint sensor module cross-sectional view provided by first embodiment of the invention；
Fig. 4 is the overlooking the structure diagram of the optical fingerprint sensor module provided by second embodiment of the invention；
Fig. 5 is the optical fingerprint sensor module cross-sectional view provided by second embodiment of the invention；
Fig. 6 is the optical fingerprint sensor module cross-sectional view provided by third embodiment of the invention；
Fig. 7 is the optical fingerprint sensor module cross-sectional view provided by fourth embodiment of the invention.
Specific embodiment
A kind of optical fingerprint sensor module is as shown in figure 1, including protective layer 100, optical fingerprint sensor 110 and backlight
Source 120.Backlight 120 is located at below protective layer 100, and 110 directly contact of optical fingerprint sensor is laminated under protective layer 100
Side.Backlight 120 is located at the side of optical fingerprint sensor 110.Now, the light that backlight 120 sends is irradiated into protection
The angle of incidence a of layer 100 is less, therefore, the peak width A that optical fingerprint sensor 110 can receive reflected light is less, causes
110 most of region of optical fingerprint sensor cannot apply to fingerprint image acquisition, therefore optical fingerprint sensor mould shown in Fig. 1
Group performance has much room for improvement, and the fingerprint image quality that optical fingerprint sensor module shown in Fig. 1 is collected has much room for improvement.
More importantly it is, in order to gather higher-quality fingerprint image, it is often desirable that reach protective layer in incident ray
During 100 upper surface, there is total reflection (fingerprint valley position in the first interface that can be formed in 100 upper surface of protective layer and air
Air is had between 100 upper surface of protective layer, therefore the interface formed with 100 upper surface of protective layer by fingerprint valley position belongs to
The part at the first interface), and 100 upper surface of protective layer and fingerprint ridge position (fingerprint ridge position can with protective layer on
Surface contacts) second contact surface that formed is normally carried out reflecting and reflect (total reflection does not occur), so as to improve fingerprint difference
The contrast of position (paddy position and ridge position), improves fingerprint image quality.And the fingerprint sensor module shown in Fig. 1 cannot be real
There is the situation that total reflection and second contact surface do not occur total reflection in existing above-mentioned first interface, therefore, the sensing of optical finger print shown in Fig. 1
Device module cannot improve fingerprint image quality.
For this purpose, the present invention provides a kind of optical fingerprint sensor module, backlight is arranged on protective layer lower surface and is made
In the groove of work, so that the integrated model of whole optical fingerprint sensor module is simpler, thickness can be made to more
It is thin.When the light that backlight sends enters protective layer by the first surface of groove, use in respective ray of light and protective layer upper surface
In contact fingerprint region formed by angle be acute angle.Now, the light that backlight sends can be being protected by corresponding side-play amount
There is the phenomenon such as reflection and refraction in the interface of sheath upper surface and finger print, and make most of effectively reflection light be irradiated to light
Learn in the photosensitive region of fingerprint sensor, therefore, whole optical fingerprint sensor module does not need the structures such as light guide plate, it becomes possible to
The identification of fingerprint image is realized, clearly fingerprint image is formed, is simplified structure, reduce cost.
Meanwhile, backlight is located in the groove in protective layer, therefore, the distance of backlight to protective layer upper surface is less,
During so that the light of backlight reaching protective layer upper surface, increase with the angle between the normal perpendicular to protective layer upper surface；
Light can occur refraction when entering protective layer from first surface, such that it is able to increase above-mentioned angle again.Angle increases, and can make
The ray regions width increase of optical fingerprint sensor is reflected into, the photosensitive region utilization rate of optical fingerprint sensor is improved.
Meanwhile, angle increase, corresponding light can occur total reflection on the protection layer in the interface of surface and air, and in finger
Optical phenomena, now, Fingers are then normally reflected and reflected etc. in the interface of fingerprint ridges and protective layer upper surface
Diverse location (the i.e. paddy position and ridge position) contrast of print image can be obviously improved, and fingerprint image quality is improved.
It is understandable for enabling the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
First embodiment of the invention provides a kind of optical fingerprint sensor module, incorporated by reference to referring to figs. 2 and 3.Fig. 2 is institute
State the overlooking the structure diagram of optical fingerprint sensor module.Fig. 3 is that the cross-section structure of the optical fingerprint sensor module shows
It is intended to.Fig. 3 can be considered the generalized section that Fig. 2 is obtained after CC chain-dotted line cuttings.
The optical fingerprint sensor module includes protective layer 200, optical fingerprint sensor 210 and backlight 220.Optics
Fingerprint sensor 210 is located at below protective layer 200.In the lower surface of protective layer 200, with upwardly recessed groove 201.Due to
It is upwardly recessed groove 201, therefore, groove 201 has top (mark) without bottom.Backlight 220 is located at groove
In 201, the light that backlight 220 sends enters protective layer 200 from the first surface 2011 of groove 201.
In the present embodiment, during first surface 2011 is each surface of groove 201, to optical fingerprint sensor 210 apart from most
Little surface (will groove 201 in apart from the nearest surface of optical fingerprint sensor 210 as first surface 2011).In groove
In 201, multiple surfaces are generally included, such as, in the present embodiment, groove 201 has top surface, meanwhile, the present embodiment groove
201 plan view shape rectangle as shown in Figure 2, now groove 201 also include four sidewall surfaces, one of sidewall surfaces are
First surface 2011.
It should be noted that distance of each surface to optical fingerprint sensor, it is the centre of surface on each surface to optics
The distance of fingerprint sensor.
It should be noted that the light that backlight sends can enter protective layer from least one of which surface of groove,
Therefore, in other embodiments, the light that backlight sends can enter protective layer from the plural surface of groove.
It should be noted that in Fig. 2, groove 201, optical fingerprint sensor 210 and backlight 220 are shown as dotted line, because
Actually covered by protective layer 200 by them in fig. 2, therefore be represented by dashed line.Meanwhile, omit in Fig. 2 and show shading
Layer 230.
In the present embodiment, the light that backlight 220 sends enters protective layer 200 from first surface 2011, and in protective layer
There is the optical phenomena such as reflection and refraction with the interface of 240 fingerprint of finger in 200 upper surfaces, part reflection light is (oblique downwards
Under) through after protective layer 200, into optical fingerprint sensor 210.Wherein it is possible to pass through to adjust what backlight 220 emitted beam
Light range, so that light more enters protective layer 200 from first surface 2011.
It should be noted that there is the light that the present embodiment control backlight 220 sends propagation angle obliquely (to carry on the back
Light that light source 220 sends is initially up or propagates obliquely, and does not directly pass to optical fingerprint sensor 210 downwards
Broadcast), so as to ensure that the light that backlight 220 sends must have passed through " in 200 upper surface of protective layer and 240 fingerprint of finger
Interface occur reflection and reflect etc. optical phenomena " after, enter back into optical fingerprint sensor 210.That is, the present embodiment
Avoid the presence of such a light：This light is sent by backlight 220, and after backlight 220 sends, without " in guarantor
There is the optical phenomena such as reflection and refraction with the interface of 240 fingerprint of finger in 200 upper surface of sheath ", just it is directly entered optics and refers to
Stricture of vagina sensor 210.This light does not carry information in fingerprint.If this light and other light are together irradiated to optics and refer to
Stricture of vagina sensor 210, can cause fingerprint image to fog.By above-mentioned control, it is to avoid this light, then final acquisition can be improved
Fingerprint image quality.
Refer to Fig. 3, in the upper surface of protective layer 200, with backlight 220 just to part there is light shield layer 230 (to protect
There is light shield layer 230) on the portion of upper surface of sheath 200.
Light shield layer 230 is set in above-mentioned relevant position, in order to block backlight 220 and do not realized by user.Therefore,
Except light shield layer 230 to be arranged on the portion of upper surface of protective layer 200, light shield layer 230 can also be arranged on by other embodiments
In other positions, for example, it is arranged on the top surface of groove 201.When not requiring that backlight 220 is not realized by user, it is also possible to
Light shield layer 230 need not be set.
In the present embodiment, backlight 220 include a LED (when backlight 220 not include other structures when, it is also possible to
Say that backlight 220 is a LED).Also, the light of the LED can be black light, purple light, blue light, green
Light, sodium yellow, red light, near infrared light or white light.
In other embodiments, backlight can be the structure for including other lamp sources.
In the present embodiment, groove 201 is located at the left side of protective layer 200.In other embodiments, groove can also be located at optics
Other sides of fingerprint sensor.
In the present embodiment, backlight 220 is located in groove 201, i.e. 220 all or most of backlight is all located at groove
In 201.Even if having part backlight 220 to be exposed to outside groove 201 downwards, and fraction.
In the present embodiment, the top surface of groove 201 is parallel with the upper and lower surface of protective layer 200.First table
Face 2011 is plane, and generally, four sidewall surfaces of groove 201 are plane.Meanwhile, first surface 2011 and groove 201
The angle of the lower surface of top surface and protective layer 200 is right angle.The groove 201 of this regular shape is relatively easy to form, can be with
The corresponding processing technology of simplification.
In the present embodiment, optical fingerprint sensor 210 and protective layer 200 are directly laminated, and " being directly laminated " refers to optics
Between fingerprint sensor 210 and protective layer 200, directly contact together or is affixed directly to together.Protective layer 200 and described
Glue-line lamination adhesive can be passed through between optical fingerprint sensor 210.The glue-line can be optical cement layer, the optical cement layer
Material can be specifically temperature-sensitive optical cement layer, Photosensitive optical glue-line or optical double-sided adhesive tape band.
In the present embodiment, have between groove 201 and optical fingerprint sensor 210 interval (interval be it is certain away from
From not marking), the size at this interval is generally equal with the distance of first surface 2011 to optical fingerprint sensor 210.It is described
The presence at interval can ensure that the light of backlight 220 is better distributed and reflex to optical fingerprint sensor 210.The interval
Depending on specific size can be needed according to design.
Though do not show in figure, there can also be light antireflection layer on first surface 2011, the smooth antireflection layer can increase
Plus the light of backlight 220 enters the ratio of protective layer 200.
In other embodiment, between first surface 2011 and backlight 220, can have light transmission medium, now, backlight
220 light is introduced into the light transmission medium and enters protective layer from the first surface again.The refractive index of light transmission medium can be selected
Select close with the refractive index of protective layer 200, so as to increase the amount of incident of light, reduce volume reflection.
Though do not show in figure, the upper surface of protective layer 200, lower surface and optical fingerprint sensor 210 upper surface
At least one, can have filter layer.The filter layer can be used for filtering ambient light or change protective layer 200 or optics
The appearance color of fingerprint sensor 210, so that improve the appearance color of whole module.
In the present embodiment, optical fingerprint sensor 210 is the sensor component that can realize fingerprint recognition.Optical finger print is passed
Sensor 210 can be the imageing sensor that made with CMOS technology based on Silicon Wafer, or based on glass substrate with
The imageing sensor that TFT techniques make, which includes the structures such as multiple photosensitive pixels.
In the optical fingerprint sensor module provided by the present embodiment, by backlight 220 is arranged in protective layer 200
Groove 201 in so that the integrated model of whole optical fingerprint sensor module is simpler, thickness can be made to more
It is thin.When the light that backlight 220 sends enters protective layer 200 by first surface 2011, respective ray of light and 200 upper table of protective layer
Angle formed by being used for contacting the region of fingerprint in face is acute angle.Now, the light that backlight 220 sends can be by corresponding inclined
Shifting amount (side-play amount refers to the horizontal direction offset distance in Fig. 3) is at the interface of 240 fingerprint of 200 upper surface of protective layer and finger
The phenomenon such as generation reflection and refraction, and make most of effectively reflection light be irradiated to the photosensitive region of optical fingerprint sensor 210
In (be specifically irradiated in the photosensitive pixel away from the essentially identical offset distance of corresponding pip), therefore, whole optical finger print is passed
Sensor module does not need the structures such as light guide plate, it becomes possible to realize the identification of fingerprint image, forms clearly fingerprint image, and letter
Change structure, reduce cost.
More importantly it is, on the one hand, as backlight 220 is located in the groove 201 in protective layer 200, therefore, backlight
The distance of source 220 to 200 upper surface of protective layer is less, and this also causes the light of backlight 220 to reach 200 upper surface of protective layer
When, increase with the angle between the normal perpendicular to 200 upper surface of protective layer, i.e. angle b increase；On the other hand, enter in light
Refraction can occur, such that it is able to increase angle b again when entering first surface 2011.The reason for two aspects, is resulted in Fig. 3
Angle b is bigger than angle a in Fig. 1.That is, light can increase in the incident angle of 200 upper surface of protective layer.And it is incident
Angle increase brings following two advantages again：First, it is reflected into the ray regions width (optics of optical fingerprint sensor 210
It is width B that fingerprint sensor 210 receives the width of ray regions, and knowable to contrast Fig. 1 and Fig. 3, width B is much larger than width A) increase,
The photosensitive region of optical fingerprint sensor 210 can be better profited from；Second, when incident angle increases to certain level, accordingly
Light total reflection be able to can occur in the interface of 200 upper surface of protective layer and air, and in 240 fingerprint ridges of finger and guarantor
Optical phenomena, now, 240 fingerprint image of finger are then normally reflected and reflected etc. in the interface of 200 upper surface of sheath
Diverse location (i.e. paddy position and ridge position) contrast can be obviously improved, fingerprint image quality improve.
Second embodiment of the invention provides another kind of optical fingerprint sensor module, incorporated by reference to reference to Fig. 4 and Fig. 5.Fig. 4 is
The overlooking the structure diagram of the optical fingerprint sensor module.Fig. 5 is the cross-section structure of the optical fingerprint sensor module
Schematic diagram.Fig. 5 can be considered the generalized section that Fig. 4 is obtained after DD chain-dotted line cuttings.
The optical fingerprint sensor module includes that protective layer 300, optical fingerprint sensor 310 and backlight (are not marked
Note).Optical fingerprint sensor 310 is located at below protective layer 300.Protective layer 300 has upwardly recessed groove 301 and groove
302.Due to being upwardly recessed groove 301 and groove 302, therefore, groove 301 and groove 302 there is top (mark) and
Without bottom.The backlight is located in groove 301 and groove 302, the light that the backlight sends from groove 301 first
Surface 3011 and protective layer 300 is entered with the first surface 3021 of groove 302.
In the present embodiment, the backlight includes two LEDs, respectively LED 321 and LED 322.LED 321
The light sent with LED 322 can be black light, purple light, blue light, green light, sodium yellow, red light, near-infrared
Light or white light, and the light color that two lamps send can be with identical, it is also possible to differ.
In the present embodiment, first surface 3011 is apart from minimum surface in groove 301 to optical fingerprint sensor 310
(will groove 301 in apart from the nearest surface of optical fingerprint sensor 310 as first surface 3011), first surface 3021 be
(will be in groove 302 apart from optical fingerprint sensor 310 apart from minimum surface to optical fingerprint sensor 310 in groove 302
Nearest surface as first surface 3021).
In Fig. 4, groove 301, groove 302, optical fingerprint sensor 310, LED 321 and LED 322 are shown as dotted line,
Because they are actually covered by protective layer 300 in the diagram, therefore are represented by dashed line.Meanwhile, omit in Fig. 4 and show screening
Photosphere.
Refer to Fig. 5, in the upper surface of protective layer 300, with LED 321 just to part there is light shield layer 331, with LED
Lamp 322 just to part there is light shield layer 332 (having light shield layer i.e. on the portion of upper surface of protective layer 300).
In the present embodiment, groove 301 is located at the left side of protective layer 300, and groove 302 is located at the right side of protective layer 300.
In the present embodiment, LED 321 is entirely located in groove 301, and LED 322 is entirely located in groove 302.Namely
Say, the number of groove is equal with the number of LED, a LED is located in a groove, and groove is evenly distributed on protective layer
In.
Turning back to referring to figs. 2 and 3 as the emergent light of the point sources such as LED has certain angle of divergence, when only one
Previous embodiment corresponding contents are may be referred to () when LED is as backlight, the emergent light of backlight and reflected light and directional light
Difference is larger.That is, the angle for being irradiated to protective layer upper surface light everywhere has bigger difference, ultimately result in different anti-
The deviation distance that the reflected light of exit point incides optical fingerprint sensor photosensitive pixel is different so that fingerprint image have it is abnormal
Become.
In order to solve above-mentioned fingerprint image aberration problems, in the optical fingerprint sensor module provided by the present embodiment, institute
Stating backlight includes two LEDs, and two LEDs are evenly distributed on the lower section of protective layer 300, while be evenly distributed on optics referring to
310 both sides of stricture of vagina sensor.Now, although the light that two LEDs send is probably each non-parallel light, while utilizing
The two LEDs, it is possible to achieve to it is non-parallel smooth when pattern distortion correction.Specifically, two LEDs can be taken in turn
The mode of figure (adopt figure in turn and refer to that two lamps chronologically successively carry out adopting figure respectively) is adopted, then by image procossing, distortion school is done
Just, fingerprint image quality is improved, improves fingerprint recognition accuracy.
It should be noted that in other embodiments, in order to make multiple LEDs be evenly distributed on the lower section of protective layer, bowing
In apparent direction, can cause corresponding multiple LEDs with the vertical view centre of figure of optical fingerprint sensor as point of symmetry (for example when
The vertical view figure of optical fingerprint sensor is easily found centre of figure when being regular polygon), it is centrosymmetric or axle pair
The mode of title, is evenly distributed on optical fingerprint sensor periphery.When being uniformly distributed, the spacing between adjacent LED lamp can be caused
It is equal, at this point it is possible to figure be adopted in turn using this multiple LED, reach raising fingerprint image quality, improve fingerprint recognition accurate
The effect of property.
The structure of the optical fingerprint sensor module provided by more the present embodiment, property and advantage may be referred to aforementioned reality
Apply a corresponding contents.
Third embodiment of the invention provides another kind of optical fingerprint sensor module, refer to Fig. 6.Fig. 6 is the optics
The cross-sectional view of fingerprint sensor module.
The optical fingerprint sensor module includes protective layer 400, optical fingerprint sensor 410 and backlight 420.Optics
Fingerprint sensor 410 is located at below protective layer 400.Protective layer 400 has upwardly recessed groove 401.Due to being upwardly recessed
Groove 401, therefore, groove 401 have top (mark) without bottom.Backlight 420 is located in groove 401, backlight
The light that source 420 sends enters protective layer 400 from the first surface 4011 of groove 401.The upper surface of protective layer 400 receives finger
Contact, show in such as Fig. 6 that finger 440 is pressed against 400 upper surface of protective layer.
In the present embodiment, first surface 4011 is apart from minimum surface in groove 401 to optical fingerprint sensor 410.
In the present embodiment, the light that backlight 420 sends enters protective layer 400 from first surface 4011, and in protective layer
There is the optical phenomena such as reflection and refraction with the interface of 440 fingerprint of finger in 400 upper surfaces, part reflection light is (oblique downwards
Under) through after protective layer 400, into optical fingerprint sensor 410.
In the present embodiment, backlight 420 includes a LED.Also, the light of the LED can be black light, purple
Coloured light, blue light, green light, sodium yellow, red light, near infrared light or white light.
In the present embodiment, groove 401 is located at the left side of protective layer 400.In other embodiments, groove can also be located at optics
Other sides of fingerprint sensor.
Different from previous embodiment, in the present embodiment, the top surface of groove 401 has light shield layer 430, light shield layer
430 are used for blocking backlight 420, so that backlight 420 is not realized by user.In other embodiments, it is also possible in groove
While top surface has light shield layer, protective layer upper surface and backlight just to part there is light shield layer.
In the present embodiment, the top surface of groove 401 is parallel with the upper and lower surface of protective layer 400.First table
During face 4011 is plane, and the present embodiment, first surface 4011 is obtuse angle with the angle of 401 top surface of groove.Due to recessed
The top surface of groove 401 is parallel with the upper and lower surface of protective layer 400, therefore, first surface 4011 and protective layer 400
It is inclined plane that the angle of lower surface is also obtuse angle, i.e. first surface 4011.
In the optical fingerprint sensor module provided by the present embodiment, setting first surface 4011 is inclined plane, from
And the area of first surface 4011 can be increased.And the light that backlight 420 sends enters protective layer from first surface 4011
400, therefore, the area for increasing first surface 4011 can make more light enter protective layer 400 from backlight 420, i.e., more
Many 420 light of backlight is used for the collection of fingerprint image, so as to improve the fingerprint recognition performance of optical fingerprint sensor module.
Also, when first surface 5011 is inclined plane, additionally it is possible to further by adjusting the angle of inclination of this clinoplain, come
Adjustment light enters incident angle range during protective layer, to be preferably adjusted flexibly to fingerprint recognition performance.
The structure of the optical fingerprint sensor module provided by more the present embodiment, property and advantage may be referred to aforementioned reality
Apply a corresponding contents.
Fourth embodiment of the invention provides another kind of optical fingerprint sensor module, refer to Fig. 7.Fig. 7 is the optics
The cross-sectional view of fingerprint sensor module.
The optical fingerprint sensor module includes protective layer 500, optical fingerprint sensor 510 and backlight 520.Optics
Fingerprint sensor 510 is located at below protective layer 500.Protective layer 500 has upwardly recessed groove 501.Due to being upwardly recessed
Groove 501, therefore, groove 501 have top (mark) without bottom.Backlight 520 is located in groove 501, backlight
The light that source 520 sends enters protective layer 500 from the first surface 5011 of groove 501.The upper surface of protective layer 500 receives finger
Contact, show in such as Fig. 7 that finger 540 is pressed against 500 upper surface of protective layer.
In the present embodiment, first surface 5011 is apart from minimum surface in groove 501 to optical fingerprint sensor 510.
In the present embodiment, the light that backlight 520 sends enters protective layer 500 from first surface 5011, and in protective layer
There is the optical phenomena such as reflection and refraction with the interface of 250 fingerprint of finger in 500 upper surfaces, part reflection light is (oblique downwards
Under) through after protective layer 500, into optical fingerprint sensor 510.
In the present embodiment, backlight 520 includes a LED.
In the present embodiment, groove 501 is located at the left side of protective layer 500.In other embodiments, groove can also be located at optics
Other sides of fingerprint sensor.
In the present embodiment, the top surface of groove 501 has light shield layer 530, and light shield layer 530 is used for blocking backlight 520,
So that backlight 520 is not realized by user.In other embodiments, it is also possible to there is the same of light shield layer in the top surface of groove
When, protective layer upper surface and backlight just to part there is light shield layer.
It is different from previous embodiment, in the present embodiment, the top surface of groove 501 and the upper surface of protective layer 500 and
Lower surface is parallel, but first surface 5011 is concave curved surface, and the top edge of concave curved surface is connected with the top surface of groove 501, recessed
The lower limb of curved surface is connected with the lower surface of protective layer 500.
In the optical fingerprint sensor module provided by the present embodiment, setting first surface 5011 is concave curved surface, so as to
Enough increase the area of first surface 5011.And the light that backlight 520 sends enters protective layer 500 from first surface 5011, because
This, the area for increasing first surface 5011 can make more light enter protective layer 500 from backlight 520, i.e., more to carry on the back
520 light of light source is used for the collection of fingerprint image, so as to improve the fingerprint recognition performance of optical fingerprint sensor module.Also,
When first surface 5011 is concave curved surface, additionally it is possible to enter angle of incidence during protective layer further with this concave curved surface adjustment light
Degree scope, is preferably adjusted flexibly to fingerprint recognition performance.
The structure of the optical fingerprint sensor module provided by more the present embodiment, property and advantage may be referred to aforementioned reality
Apply a corresponding contents.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, without departing from this
In the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
The scope of restriction is defined.
Claims (11)
1. a kind of optical fingerprint sensor module, including：
Protective layer；
Optical fingerprint sensor, the optical fingerprint sensor are located at below the protective layer；
Backlight；
Characterized in that,
The protective layer lower surface has upwardly recessed groove, and the groove has top；
The backlight is located in the groove, and the light that the backlight sends is from least one of which surface of the groove
Into the protective layer.
2. optical fingerprint sensor module as claimed in claim 1, it is characterised in that in the surface of the groove, to described
The minimum surface of optical fingerprint sensor distance is first surface, and the light that the backlight sends is entered from the first surface
The protective layer.
3. optical fingerprint sensor module as claimed in claim 2, it is characterised in that the top surface of the groove with it is described
The upper and lower surface of protective layer is parallel；The first surface is plane, the top of the first surface and the groove
The angle of the lower surface of surface and the protective layer is all right angle.
4. optical fingerprint sensor module as claimed in claim 2, it is characterised in that the top surface of the groove with it is described
The upper and lower surface of protective layer is parallel；The first surface is plane, the top of the first surface and the groove
The angle of the lower surface of surface and the protective layer is all obtuse angle.
5. optical fingerprint sensor module as claimed in claim 2, it is characterised in that the first surface is concave curved surface, institute
The top edge for stating concave curved surface is connected with the top surface of the groove, the following table of the lower limb of the concave curved surface and the protective layer
Face connects.
6. optical fingerprint sensor module as claimed in claim 2, it is characterised in that the first surface has light anti-reflection
Layer, the smooth antireflection layer can increase the ratio that the light of the backlight enters the protective layer.
7. the optical fingerprint sensor module as described in claim 1-6 any one, it is characterised in that the protective layer it is upper
In surface, with the backlight just to part there is light shield layer；Or, the top surface of the groove has light shield layer；Or
Person, the upper surface of the protective layer and the backlight just to part there is light shield layer, and the top surface of the groove
With light shield layer.
8. the optical fingerprint sensor module as described in claim 1-6 any one, it is characterised in that the backlight includes
At least one LED, the light of the LED are black light, purple light, blue light, green light, sodium yellow, red light, near red
Outer light or white light.
9. the optical fingerprint sensor module as described in claim 1-6 any one, it is characterised in that the backlight includes
Plural LED, the LED are respectively positioned in the groove, and the light of the LED is black light, purple light, blueness
Light, green light, sodium yellow, red light, near infrared light or white light.
10. optical fingerprint sensor module as claimed in claim 9, it is characterised in that the number of the groove and the LED
The number of lamp is equal, and a LED is located in a groove, and the groove is evenly distributed in the protective layer.
The 11. optical fingerprint sensor modules as described in claim 1-6 any one, it is characterised in that the backlight and
There is between the first surface light transmission medium, the light of the backlight is introduced into the light transmission medium again from first table
Face enters protective layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016703.9A CN106529487A (en) | 2016-11-18 | 2016-11-18 | Optical fingerprint sensor module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016703.9A CN106529487A (en) | 2016-11-18 | 2016-11-18 | Optical fingerprint sensor module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106529487A true CN106529487A (en) | 2017-03-22 |
Family
ID=58352541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611016703.9A Pending CN106529487A (en) | 2016-11-18 | 2016-11-18 | Optical fingerprint sensor module |
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| CN (1) | CN106529487A (en) |
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Application publication date: 20170322 |