CN107609456A - Optical fingerprint sensor module - Google Patents
Optical fingerprint sensor module Download PDFInfo
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- CN107609456A CN107609456A CN201610545523.3A CN201610545523A CN107609456A CN 107609456 A CN107609456 A CN 107609456A CN 201610545523 A CN201610545523 A CN 201610545523A CN 107609456 A CN107609456 A CN 107609456A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 111
- 238000000465 moulding Methods 0.000 claims abstract description 27
- 239000010410 layer Substances 0.000 claims description 230
- 239000000758 substrate Substances 0.000 claims description 45
- 239000011241 protective layer Substances 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 17
- 239000012528 membrane Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 7
- 238000007639 printing Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 13
- 238000003384 imaging method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 230000003321 amplification Effects 0.000 description 3
- 238000005401 electroluminescence Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 230000000392 somatic effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
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- Optics & Photonics (AREA)
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
A kind of optical fingerprint sensor module, including：Optical fingerprint sensor, the optical fingerprint sensor have device layer, and the device layer has pixel region；The pixel region has multiple pixels；Planar backlight；Light collimates layer, between the optical fingerprint sensor and the planar backlight；The light collimation layer includes the n-layer shutter film layer being laminated from top to bottom, and every layer of shutter film layer includes a plurality of transmissive slit of parallel arrangement and a plurality of shading moulding, and the transmissive slit is between the adjacent shading moulding；In the shutter film layer of odd-level, the length of the transmissive slit is axially extending along first；In the shutter film layer of even level, the length of the transmissive slit is axially extending along second；Described first is axially axially vertical with described second.The optical fingerprint sensor modular structure optimization, performance improve.
Description
Technical field
The present invention relates to optical finger print to identify field, more particularly to a kind of optical fingerprint sensor module.
Background technology
Fingerprint imaging identification technology, be the fingerprint image that human body is collected by optical fingerprint sensor, then with system
In existing fingerprint imaging information be compared, whether carry out correct judgment, and then realize the technology of identification.Due to its use
Convenience, and the uniqueness of somatic fingerprint, fingerprint imaging identification technology be widely used in every field.Such as public security
Consumer product area such as the office and field of safety check such as customs, the gate control system of building and PC and mobile phone etc..Fingerprint imaging
The implementation of identification technology has the multiple technologies such as optical imagery, capacitance imaging, ultrasonic imaging.Comparatively, optical finger print into
Picture identification technology imaging effect is relatively preferable, and equipment cost is relatively low.
More contents about optical fingerprint sensor refer to Publication No. CN204759454U Chinese utility model
Patent.
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 present invention solves the problems, such as to be to provide a kind of optical fingerprint sensor module, to optimize optical fingerprint sensor module
Structure, improve optical fingerprint sensor module performance.
To solve the above problems, the present invention provides a kind of optical fingerprint sensor module, including：Optical fingerprint sensor,
The optical fingerprint sensor has device layer, and the device layer has pixel region；The pixel region has multiple pixels；Planar
Backlight；Light collimates layer, between the optical fingerprint sensor and the planar backlight；Light collimation layer include from
Under to upper stacking n-layer shutter film layer, n be more than 2 integer；Every layer of shutter film layer includes a plurality of of parallel arrangement
Transmissive slit and a plurality of shading moulding, the transmissive slit is between the adjacent shading moulding.
Optionally, in the shutter film layer of odd-level, the length of the transmissive slit is axially extending along first；
In the shutter film layer of even level, the length of the transmissive slit is axially extending along second；It is described first axially with
Described second is axially vertical.
Optionally, the cross section of the transmissive slit is parallelogram, the angle at four angles in the parallelogram
Scope is 45 degree~135 degree.
Optionally, in the cross section of the transmissive slit, the ratio highly with mean breadth is more than 10；One described
The width sum of optical slits and a shading moulding is less than or equal to the half of the pixel a line length.
Optionally, the cross section of the transmissive slit is isosceles trapezoid, and the angular range at base angle is in the isosceles trapezoid
45 degree~90 degree；In the cross section of the transmissive slit, the ratio highly with base width is more than 10；One printing opacity is narrow
The width sum of seam and a shading moulding is less than or equal to the half of the pixel a line length.
Optionally, at least one of which surface of the upper and lower surface of the shutter film layer also includes diaphragm.
Optionally, it is air, vacuum or light transmission medium in the transmissive slit.
Optionally, the module also includes protective layer, and the protective layer is single layer structure or sandwich construction.
Optionally, at least one of which surface of the upper and lower surface of the protective layer has filter layer.
Optionally, the optical fingerprint sensor includes a transparent substrates；The transparent substrates, which have, is directly used in hand
Refer to the first surface of fingerprint tough；The transparent substrates have the second surface covered by device layer.
Optionally, the first surface has filter layer.
Compared with prior art, technical scheme has advantages below：
In the optical fingerprint sensor module that technical scheme is provided, in the optical fingerprint sensor and institute
Setting light collimates layer between stating planar backlight, and light collimation layer has shutter film layer.When skew ray is irradiated into more than two layers phase
Mutually during vertical shutter film layer, the light of angle more vertically upward is only allowed to pass through, so that light collimation layer can be realized
The effect of light collimation.Make a large amount of light and finger print surface, and corresponding angular range are all reached with less angular range
Angle between finger print surface causes different angle so as to both reduce all close to right angle because ranges of incidence angles is larger
Reflected light interfere with each other, ensure that reflection light is irradiated to the pixel nearer from its pip again, so as to improve optical finger print
The definition for the fingerprint image that sensor module is formed and the degree of accuracy.
Further, optical fingerprint sensor only includes a transparent substrates, and now, the light that planar backlight is sent is being worn
When crossing optical fingerprint sensor, it is only necessary to which, through device layer and a transparent substrates, therefore, the substrate that light passes through is less, has
Help to be formed clearly fingerprint image.Simultaneously as optical fingerprint sensor is simple in construction, thickness reduces, and simplifies optics and refers to
The structure of line sensor module, reduces cost.In addition, the light that planar backlight is sent passes through device layer and transparent substrates
Afterwards, the light increase of transparent substrates first surface is reached, whole optical fingerprint sensor module can more accurately realize fingerprint
The identification of image, the definition of fingerprint image is further increased, and further simplifies the structure of optical fingerprint sensor module,
Reduce cost.
Brief description of the drawings
Fig. 1 is the optical fingerprint sensor module diagrammatic cross-section that first embodiment of the invention is provided；
Fig. 2 is the schematic top plan view of wherein one layer shutter film layer in Fig. 1；
Fig. 3 is the diagrammatic cross-section of shutter film layer in Fig. 2；
Fig. 4 is part (part) enlarged diagram of shutter film layer in Fig. 3；
Fig. 5 is the optical fingerprint sensor module diagrammatic cross-section that second embodiment of the invention is provided；
Fig. 6 is the enlarged schematic partial view of wherein one layer shutter film layer in Fig. 5；
Fig. 7 is the optical fingerprint sensor module diagrammatic cross-section that third embodiment of the invention is provided；
Fig. 8 is the enlarged schematic partial view of wherein one layer shutter film layer in Fig. 7.
Embodiment
In a kind of existing optical fingerprint sensor module, the light seldom using light collimation layer to optical fingerprint sensor module
Line is adjusted, even if part is also unsatisfactory using the optical fingerprint sensor module of light collimation layer, its light collimating effect.
Therefore, the present invention provides a kind of new optical fingerprint sensor module, the optical fingerprint sensor module uses
A kind of light collimation layer with multilayer shutter film layer, so as to realize effective adjustment to light, makes optical fingerprint sensor mould
The fingerprint image quality that group obtains improves.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, 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, refer to Fig. 1.The optical finger print sensing
Device module includes optical fingerprint sensor 120 and planar backlight 140.Planar backlight 140 is located at optical fingerprint sensor 120
Lower section.
Fig. 1 is refer to, the optical fingerprint sensor module also includes protective layer 110.Protective layer 110 is located at optical finger print
The top of sensor 120.
Fig. 1, the optical fingerprint sensor module also bag light collimation layer 130 are refer to, light collimation layer 130 refers to positioned at optics
Between line sensor 120 and planar backlight 140.
In the present embodiment, optical fingerprint sensor 120 has transparent substrates 121 and device layer 122.Transparent substrates 121
Thickness can be in below 0.4cm, the too thin bad mechanical strength of transparent substrates 121, and can not ensure optical fingerprint sensor 120 can
By property.Transparent substrates 121 are too thick, whole optical fingerprint sensor module thickness increase, produce various adverse effects.Device layer
122 between transparent substrates 121 and protective layer 110.Though not shown in figure, device layer 122 has pixel region.The pixel
Area has multiple pixels.Each pixel has transmission region and non-transparent region.The non-transparent region has photosensitive member
Part.The transmission region enables the pixel region of the light through device layer 122.
In the present embodiment, planar backlight 140 includes point source of light (not shown) and light guide plate (not shown).The point-like
Light source can be LED.In other embodiments, planar backlight can also directly be the area light source structure from main light emission
(face battle array structure), for example be Organic Light Emitting Diode area source or electroluminescence area source etc..In other embodiments, point-like light
Source can also be other suitable lamp sources, for example, fluorescent lamp.
In the present embodiment, protective layer 110 is single layer structure, and the lower surface of protective layer 110 has filter layer 111.Filter layer
111 can be the interference reflecting layer of the light absorbing layers such as ink or multi-layer film structure.Filter layer 111 is used for filter ring
Border light or the appearance color for changing protective layer 110.It should be noted that in other embodiments, protective layer can also be multilayer knot
Structure, and at least one of the upper and lower surface of protective layer has filter layer.
In the present embodiment, light collimation layer 130 includes two layers of shutter film layer being laminated from top to bottom, respectively blinds fenestrated membrane
Layer 131 and shutter film layer 132.In other embodiments, light collimation layer can include the shutter film layer of n-layer, and n is more than 2
Integer.
Fig. 2 and Fig. 3 are refer to, Fig. 2 shows the plan structure of shutter film layer 131, and Fig. 3 shows blinds shown in Fig. 2
The cross-sectional structure that fenestrated membrane layer 131 obtains along A-A ' chain-dotted line cuttings.See from Fig. 2 and Fig. 3, shutter film layer 131 includes flat
(Fig. 2 and Fig. 3 are not marked a plurality of transmissive slit 1311 and a plurality of shading moulding 1312 of row arrangement, and the amplification that refer in Fig. 4 is shown
It is intended to).Transmissive slit 1311 is between adjacent shading moulding 1312.Although the plan structure and section of shutter film layer 132
Structure is not shown, but it is identical with structure shown in Fig. 2 and Fig. 3, i.e., in the present embodiment, every layer of shutter film layer includes parallel
The a plurality of transmissive slit of cloth and a plurality of shading moulding, transmissive slit is between adjacent shading moulding.
In the present embodiment, from top to bottom, in the shutter film layer of odd-level, the length of transmissive slit is axial along first
Extension.From top to bottom, in the shutter film layer of even level, the length of transmissive slit is axially extending along second.It is also, described
First is axially axially vertical with described second.Specifically, in the present embodiment, shutter film layer 131 is first layer, as odd-level
Shutter film layer.Shutter film layer 132 is the shutter film layer of the second layer, as even level.Now, transmissive slit 1311
Length is axially extending along first, and the transmissive slit length of shutter film layer 132 is axially extending along second.That is, bowing
In apparent direction, when structure shown in Fig. 2 is rotated by 90 ° and then overlapped onto it is original do not rotate before structure on, that is, obtain this reality
Apply a plan structure for light collimation layer 130.
Said structure is said from another angle, is exactly：In two layers adjacent of shutter film layer of in the vertical direction, two layers
The transmissive slit of shutter film layer is mutually perpendicular in the projection of same level.
In other embodiments, described first can be axially axially other angles with described second, i.e., be not mutually to hang down
Straight relation, as long as and intersect, or even it is described first axially with described second axially can be same axial direction.
Due to the addition of light collimation layer 130, the emergent light of planar backlight 140 is enabled to by a very big angle model
Enclose, be changed into the angular range of a very little, reduce the signal cross-talk between the different pixels in optical fingerprint sensor, improve
The definition of fingerprint image.
It refer to Fig. 4, Fig. 4 is the magnified partial view of cross-sectional structure shown in Fig. 3, and dotted line frame O is surrounded in specially Fig. 3
Partial enlarged drawing.See from Fig. 4, in the present embodiment, in the cross section of transmissive slit 1311, transmissive slit 1311 has height
K1 and mean breadth m1.
In the present embodiment, height k1 and mean breadth m1 ratio is more than 10, so as to ensure that light collimation layer 130 realizes have
The light collimation of effect.Now, as shown in Figure 4, only particular light ray (black unidirectional arrow represents light) can pass through blinds
Fenestrated membrane layer 131, and other light, then can not pass through shutter film layer 131.
It is further seen in Fig. 4, the width sum of a transmissive slit 1311 and a shading moulding 1312 is width
n1.The present embodiment sets n1 to be less than or equal to the half that a pixel a line is grown, so as to ensure that each pixel connects
Receive uniform light (uniformity for ensureing the light through light collimation layer 130).
It is further seen in Fig. 4, the upper surface of shutter film layer 131 includes diaphragm 1314, shutter film layer 131
Lower surface includes diaphragm 1313.Diaphragm 1313 and diaphragm 1314 can play protection transmissive slit 1311 and shading moulding
1312 effect.In other embodiments, in the upper and lower surface of shutter film layer, can also only have a surface has guarantor
Cuticula.
It is air, vacuum or light transmission medium in transmissive slit 1311 in the present embodiment.When being true in transmissive slit 1311
During empty or light transmission medium, advantageously in the transmission of light.
In the present embodiment, due to collimating layer 130 with light, the spurious rays that planar backlight 140 is sent can be adjusted to
The less light of angular range.The less light of angular range is advantageous to optical fingerprint sensor module and forms the finger become apparent from
Print image.And instead come, in the case where fingerprint image definition can reach necessary requirement, the present embodiment can use thickness more
Big protective layer 110, so as to increase the mechanical strength of protective layer 110.When the size dimension of the pixel is less than 100 μm or so
(being, for example, 50 μm), the thickness of protective layer 110 can be controlled in below 2mm.And if without light collimate layer 130 when
Wait, it is necessary to which protective layer 110 is controlled in the clear fingerprint image of below 0.4mm ability.Therefore, setting light to collimate layer 130 can make
The thickness of protective layer 110 has bigger range of choice.
In the optical fingerprint sensor module that the present embodiment is provided, planar backlight 140 and optical fingerprint sensor 120
Between be light collimation layer 130, light collimation layer 130 include shutter film layer 131 and shutter film layer 132, they are mutually perpendicular to set
(i.e. their transmissive slit is orthogonal axially extending along two) is put, so that the light that planar backlight 140 is sent exists
After light collimates layer 130, being converted into directional light or nearly directional light, (nearly directional light refers to maximum angle difference within 10 degree
Light), so that optical fingerprint sensor module can obtain clearly fingerprint image.Simultaneously as light collimation layer 130 wraps
The orthogonal shutter film layer of two layers of transmissive slit is included, therefore, the collimating effect of light collimation layer 130 is good, and light collimation layer 130
Simple in construction, cost is low.
Second embodiment of the invention provides another optical fingerprint sensor module, refer to Fig. 5.The optical finger print passes
Sensor module includes optical fingerprint sensor 210 and planar backlight 230.Planar backlight 230 is located at optical fingerprint sensor
210 lower sections.The optical fingerprint sensor module also bag light collimation layer 220, light collimation layer 220 are located at optical fingerprint sensor
Between 210 and planar backlight 230.
In the present embodiment, optical fingerprint sensor 210 has transparent substrates 211 and device layer 212.Also, optical finger print
One and only one transparent substrates of sensor 210, i.e. transparent substrates 211.Transparent substrates 211, which have, to be directly used in finger print and connects
Tactile first surface (not marking, be the upper surface in Fig. 5).Transparent substrates have the second surface covered by device layer 212 (not
Mark, it is the lower surface in Fig. 5).The thickness of transparent substrates 211 can be in below 0.4cm, the too thin machinery of transparent substrates 211
Intensity difference, the reliability of optical fingerprint sensor 210 can not be ensured.Transparent substrates 211 are too thick, whole optical fingerprint sensor
Module thickness increases, and produces various adverse effects.
In the present embodiment, device layer 212 is located immediately at the lower surface of transparent substrates 211.Though do not shown in figure, device layer
212 have pixel region.The pixel region has multiple pixels.Each pixel has transmission region and non-transparent region.Institute
Stating non-transparent region has photo-sensitive cell (not shown).The transmission region enables the picture of the light through device layer 212
Plain area.
In the present embodiment, the first surface of transparent substrates 211 has filter layer 213.Filter layer 213 can be multilayer
The interference reflecting layer of membrane structure.Filter layer 213 is used to filter ambient light or changes the appearance color of protective layer 210.Other realities
Apply in example, the first surface of transparent substrates and at least one of which surface of the second surface there can be filter layer.
The filter layer can include at least one of interference reflecting layer and light absorbing layer.Wherein, interference reflecting layer can increase
There is finger with without the reflected light difference at finger, so as to increase picture contrast, reducing interference of the ambient light to fingerprint image, with
Reduce influence of the ambient light to fingerprint imaging.
In the present embodiment, planar backlight 230 includes point source of light (not shown) and light guide plate (not shown).The point-like
Light source can be LED.In other embodiments, planar backlight can also directly be the area light source structure from main light emission
(face battle array structure), for example be Organic Light Emitting Diode area source or electroluminescence area source etc..In other embodiments, point-like light
Source can also be other suitable lamp sources, for example, fluorescent lamp.
In the present embodiment, light collimation layer 220 includes two layers of shutter film layer being laminated from top to bottom, respectively blinds fenestrated membrane
Layer 221 and shutter film layer 222.
The a plurality of transmissive slit and a plurality of masking frame of shutter film layer 221 and shutter film layer 222 including parallel arrangement
Bar, transmissive slit is between adjacent shading moulding.Fig. 6 be shutter film layer 221 shown in Fig. 5 part-structure enlarged drawing, Fig. 6
Show the transmissive slit 2211 and shading moulding 2212 of shutter film layer 221.Transmissive slit 2211 is located at adjacent shading moulding
Between 2212.Although the part-structure amplification of shutter film layer 222 is not shown, it is identical with structure shown in Fig. 6.
In the present embodiment, from top to bottom, in the shutter film layer of odd-level, the length of transmissive slit is axial along first
Extension.From top to bottom, in the shutter film layer of even level, the length of transmissive slit is axially extending along second.It is also, described
First is axially axially vertical with described second.Specifically, in the present embodiment, shutter film layer 221 is the shutter of odd-level
Film layer, shutter film layer 222 are the shutter film layer of even level.Now, the length of transmissive slit 2211 is axially prolonged along first
Stretch, and the transmissive slit length of shutter film layer 222 is axially extending along second.
Said structure is said from another angle, is exactly：In two layers adjacent of shutter film layer of in the vertical direction, two layers
The transmissive slit of shutter film layer is mutually perpendicular in the projection of same level.
In other embodiments, described first can be axially axially other angles with described second, i.e., be not mutually to hang down
Straight relation.
It refer to Fig. 6, the cross section of transmissive slit 2211 is parallelogram, the angle model at four angles in parallelogram
Enclose for 45 degree~135 degree.Specifically, in Fig. 6, the angle a at the one of base angle of parallelogram, the scope for making angle a is 45
~135 degree of degree, now, ensure that mutually due enough parallel rays or nearly parallel rays pass through transmissive slit 2211.
It refer to Fig. 6, in the cross section of transmissive slit 2211, the height k2's and mean breadth m2 of the quadrangle of cross section
Ratio is more than 10, so as to ensure that light collimation layer 220 realizes effective light collimation.Now as shown in Figure 6, only specific light
Line (black unidirectional arrow represents light) can pass through shutter film layer 221, and other light, then can not pass through shutter film layer
221。
It is further seen in Fig. 6, the width sum of a transmissive slit 2211 and a shading moulding 2212 is width
N2, the present embodiment sets n2 to be less than or equal to the half that a pixel a line is grown, so as to ensure that each pixel connects
Receive uniform light (uniformity for ensureing the light through light collimation layer 220).
It is further seen in Fig. 6, the upper surface of shutter film layer 221 includes diaphragm 2214, shutter film layer 221
Lower surface includes diaphragm 2213.Diaphragm 2213 and diaphragm 2214 can play protection transmissive slit 2211 and shading moulding
2212 effect.
In other embodiments, in the upper and lower surface of shutter film layer, can also only have a surface has protection
Film.
It is air, vacuum or light transmission medium in transmissive slit 2211 in the present embodiment.When being true in transmissive slit 2211
During empty or light transmission medium, advantageously in the transmission of light.
In the present embodiment, due to collimating layer 220 with light, the spurious rays that planar backlight 230 is sent can be adjusted to
The less light of angular range, now, optical fingerprint sensor module can be advantageous to and form the fingerprint image become apparent from.
In the optical fingerprint sensor module that the present embodiment is provided, planar backlight 230 and optical fingerprint sensor 210
Between be light collimation layer 220, light collimation layer 220 include two layers of shutter film layer, they are arranged in a mutually vertical manner, so that emergent light
Line is converted into directional light or nearly directional light, so as to realize clearly fingerprint image.Due to the addition of light collimation layer 220 so that go out
Light is penetrated by a very big angular range, is changed into the angular range of a very little, reduces different institutes in optical fingerprint sensor
The signal cross-talk between pixel is stated, improves the definition of fingerprint image.Simultaneously as light collimation layer 220 includes two layers of transmissive slit
Orthogonal shutter film layer, therefore, the collimating effect of light collimation layer 220 are good, and light collimation layer 220 is simple in construction, cost
It is low.
In addition, in the optical fingerprint sensor module that the present embodiment is provided, optical fingerprint sensor only includes one thoroughly
Photopolymer substrate 211, now, the light that planar backlight 230 is sent is when through optical fingerprint sensor 210, it is only necessary to through device
Part layer 212 and a transparent substrates 211, therefore, the substrate that light passes through are less, help to be formed clearly fingerprint image.Together
When, because optical fingerprint sensor 210 is simple in construction, thickness reduces, and simplifies the structure of optical fingerprint sensor module, reduces
Cost.In addition, the light that planar backlight 230 is sent after device layer 212 and transparent substrates 211, reaches transparent substrates
The light increase of 211 first surfaces, whole optical fingerprint sensor module can more accurately realize the identification of fingerprint image, enter
One step improves the definition of fingerprint image, and further simplifies the structure of optical fingerprint sensor module, reduces cost.
Third embodiment of the invention provides another optical fingerprint sensor module, refer to Fig. 7.The optical finger print passes
Sensor module includes optical fingerprint sensor 310 and planar backlight 330.Planar backlight 330 is located at optical fingerprint sensor
310 lower sections.The optical fingerprint sensor module also bag light collimation layer 320, light collimation layer 320 are located at optical fingerprint sensor
Between 310 and planar backlight 330.
In the present embodiment, optical fingerprint sensor 310 has transparent substrates 311 and device layer 312.Transparent substrates 311 have
There is the first surface (not marking, be the upper surface in Fig. 7) for being directly used in finger print contact.Transparent substrates have by device layer
The second surface (not marking, be the lower surface in Fig. 7) of 312 coverings.Also, optical fingerprint sensor 310 one and only one
Transparent substrates, i.e. transparent substrates 311.Device layer 312 is located immediately at the lower surface of transparent substrates 311.
Though not shown in figure, device layer 312 has pixel region.The pixel region has multiple pixels.Each picture
Element has transmission region and non-transparent region.The non-transparent region has photo-sensitive cell (not shown).The transmission region makes
Light can pass through the pixel region of device layer 312.
In the present embodiment, the first surface of transparent substrates 311 has filter layer 313.Filter layer 313 can be multilayer
The interference reflecting layer of membrane structure.Filter layer 313 is used to filter ambient light or changes the appearance color of protective layer 310.Other realities
Apply in example, the first surface of transparent substrates and at least one of which surface of the second surface there can be filter layer.
The filter layer can include at least one of interference reflecting layer and light absorbing layer.Wherein, interference reflecting layer can increase
There is finger with without the reflected light difference at finger, so as to increase picture contrast, reducing interference of the ambient light to fingerprint image, with
Reduce influence of the ambient light to fingerprint imaging.
In the present embodiment, planar backlight 330 includes point source of light (not shown) and light guide plate (not shown).The point-like
Light source can be LED.In other embodiments, planar backlight can also directly be the area light source structure from main light emission
(face battle array structure), for example be Organic Light Emitting Diode area source or electroluminescence area source etc..In other embodiments, point-like light
Source can also be other suitable lamp sources, for example, fluorescent lamp.
In the present embodiment, light collimation layer 320 includes three layers of shutter film layer being laminated from top to bottom, respectively blinds fenestrated membrane
Layer 321, shutter film layer 322 and shutter film layer 323.
Shutter film layer 321, shutter film layer 322 and shutter the film layer 323 a plurality of printing opacity including parallel arrangement are narrow
Seam and a plurality of shading moulding, transmissive slit is between adjacent shading moulding.
Fig. 8 is the part-structure enlarged drawing of shutter film layer 321 shown in Fig. 7, and Fig. 8 shows the saturating of shutter film layer 321
Optical slits 3211 and shading moulding 3212.Transmissive slit 3211 is between adjacent shading moulding 3212.Although shutter film layer
322 and shutter film layer 323 part-structure amplification it is not shown, but it is identical with structure shown in Fig. 8.
In the present embodiment, from top to bottom, in the shutter film layer of odd-level, the length of transmissive slit is axial along first
Extension.From top to bottom, in the shutter film layer of even level, the length of transmissive slit is axially extending along second.It is also, described
First is axially axially vertical with described second.Specifically, in the present embodiment, shutter film layer 321 and shutter film layer 323 are
The shutter film layer of odd-level, shutter film layer 322 are the shutter film layer of even level.Now, the length of transmissive slit 3211
Degree is axially extending along first, and the transmissive slit length of shutter film layer 322 is axially extending along second, shutter film layer 323
Transmissive slit length is also axially extending along first.
Said structure is said from another angle, is exactly：It is adjacent in three layers of adjacent shutter film layer of in the vertical direction
The transmissive slit of two layers of shutter film layer is mutually perpendicular in the projection of same level.
In other embodiments, described first can be axially axially other angles with described second, i.e., be not mutually to hang down
Straight relation.
It refer to Fig. 8, the cross section of transmissive slit 3211 is isosceles trapezoid, and the angular range at base angle is 45 in isosceles trapezoid
~90 degree of degree, including 45 degree but do not include 90 degree, because when being equal to 90 degree, cross section is changed into rectangle, now as first is real
Apply shown in the situation of example.Specifically, in Fig. 8, the base angle of isosceles trapezoid is angle b, and it is 45 degree~90 to make angle b scopes, now,
Ensure that mutually due enough parallel rays or nearly parallel rays pass through transmissive slit 3211.Also, due to planar backlight
330 light sent upwardly propagate, and the cross section that this bottom is more than upper bottom edge is advantageously implemented more preferable light collimation
Effect.
It refer to Fig. 8, in the cross section of transmissive slit 3211, height k3 and base width m3 is (during transmissive slit is trapezoidal
Long side in upper following be base, and short side is top margin) ratio more than 10, realized effectively so as to ensure that light collimates layer 320
Light collimation.Now as shown in Figure 8, only particular light ray (black unidirectional arrow represents light) can pass through shutter film layer
321, and other light, then it can not pass through shutter film layer 321.
It is further seen in Fig. 8, the width sum of a transmissive slit 3211 and a shading moulding 3212 is width
N3, the present embodiment sets n3 to be less than or equal to the half that a pixel a line is grown, so as to ensure that each pixel connects
Receive uniform light (uniformity for ensureing the light through light collimation layer 320).
It is further seen in Fig. 8, the upper surface of shutter film layer 321 includes diaphragm 3214, shutter film layer 321
Lower surface 2213 includes diaphragm 3213.Diaphragm 3213 and diaphragm 3214 can play protection transmissive slit 3211 and shading
The effect of moulding 3212.
In other embodiments, in the upper and lower surface of shutter film layer, can also only have a surface has protection
Film.
It is air, vacuum or light transmission medium in transmissive slit 3211 in the present embodiment.When being true in transmissive slit 3211
During empty or light transmission medium, advantageously in the transmission of light.
In the present embodiment, due to collimating layer 320 with light, the spurious rays that planar backlight 330 is sent can be adjusted to
The less light of angular range, now, optical fingerprint sensor module can be advantageous to and form the fingerprint image become apparent from.
In the optical fingerprint sensor module that the present embodiment is provided, planar backlight 330 and optical fingerprint sensor 310
Between be light collimation layer 320, light collimation layer 320 include three layers of shutter film layer, the transmissive slit of adjacent two layers shutter film layer
It is arranged in a mutually vertical manner, so that emergent ray is converted into directional light or nearly directional light, so as to realize clearly fingerprint image.Due to
Light collimates the addition of layer 320 so that emergent light is changed into the angular range of a very little, lowered by a very big angular range
Signal cross-talk in optical fingerprint sensor between the different pixels, improve the definition of fingerprint image.Simultaneously as light is accurate
Straight layer 320 includes three layers of shutter film layer, and therefore, the collimating effect of light collimation layer 320 is more preferable.
In addition, in the optical fingerprint sensor module that the present embodiment is provided, optical fingerprint sensor only includes one thoroughly
Photopolymer substrate 311, now, the light that planar backlight 330 is sent is when through optical fingerprint sensor 310, it is only necessary to through device
Part layer 312 and a transparent substrates 311, therefore, the substrate that light passes through are less, help to be formed clearly fingerprint image.Together
When, because optical fingerprint sensor 310 is simple in construction, thickness reduces, and simplifies the structure of optical fingerprint sensor module, reduces
Cost.In addition, the light that planar backlight 330 is sent after device layer 312 and transparent substrates 311, reaches transparent substrates
The light increase of 311 first surfaces, whole optical fingerprint sensor module can more accurately realize the identification of fingerprint image, enter
One step improves the definition of fingerprint image, and further simplifies the structure of optical fingerprint sensor module, reduces cost.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, this is not being departed from
In the spirit and scope of invention, it 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：
Optical fingerprint sensor, the optical fingerprint sensor have device layer, and the device layer has pixel region；The pixel
Area has multiple pixels；
Planar backlight；
Light collimates layer, between the optical fingerprint sensor and the planar backlight；
Characterized in that,
The light collimation layer includes the n-layer shutter film layer being laminated from top to bottom, and n is more than 2 integer；
Every layer of shutter film layer includes a plurality of transmissive slit of parallel arrangement and a plurality of shading moulding, the transmissive slit position
Between the adjacent shading moulding.
2. optical fingerprint sensor module as claimed in claim 1, it is characterised in that positioned at the blinds fenestrated membrane of odd-level
In layer, the length of the transmissive slit is axially extending along first；In the shutter film layer of even level, the printing opacity is narrow
The length of seam is axially extending along second；Described first is axially axially vertical with described second.
3. optical fingerprint sensor module as claimed in claim 1, it is characterised in that the cross section of the transmissive slit is flat
Row quadrangle, the angular range at four angles is 45 degree~135 degree in the parallelogram.
4. optical fingerprint sensor module as claimed in claim 3, it is characterised in that in the cross section of the transmissive slit,
Ratio highly with mean breadth is more than 10；The width sum of one transmissive slit and a shading moulding is less than
Or the half equal to the pixel a line length.
5. optical fingerprint sensor module as claimed in claim 1, it is characterised in that the cross section of the transmissive slit for etc.
Waist is trapezoidal, and the angular range at base angle is 45 degree~90 degree in the isosceles trapezoid；In the cross section of the transmissive slit, highly with
The ratio of base width is more than 10；The width sum of one transmissive slit and a shading moulding is less than or equal to
The half of the one pixel a line length.
6. optical fingerprint sensor module as claimed in claim 1, it is characterised in that the upper surface of the shutter film layer and
At least one of which surface of lower surface also includes diaphragm.
7. optical fingerprint sensor module as claimed in claim 1, it is characterised in that be air in the transmissive slit, true
Empty or light transmission medium.
8. the optical fingerprint sensor module as described in claim 1 to 7 any one, it is characterised in that also including protective layer,
The protective layer is single layer structure or sandwich construction.
9. optical fingerprint sensor module as claimed in claim 8, it is characterised in that the upper surface of the protective layer and following table
At least one of which surface in face has filter layer.
10. the optical fingerprint sensor module as described in claim 1 to 7 any one, it is characterised in that the optical finger print
Sensor includes a transparent substrates；The transparent substrates have the first surface for being directly used in finger print contact；It is described
Photopolymer substrate has the second surface covered by device layer.
11. optical fingerprint sensor module as claimed in claim 10, it is characterised in that the first surface, which has, to filter
Layer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610545523.3A CN107609456A (en) | 2016-07-12 | 2016-07-12 | Optical fingerprint sensor module |
| PCT/CN2016/095828 WO2018010250A1 (en) | 2016-07-12 | 2016-08-18 | Optical fingerprint sensor module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610545523.3A CN107609456A (en) | 2016-07-12 | 2016-07-12 | Optical fingerprint sensor module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107609456A true CN107609456A (en) | 2018-01-19 |
Family
ID=60951648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610545523.3A Pending CN107609456A (en) | 2016-07-12 | 2016-07-12 | Optical fingerprint sensor module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107609456A (en) |
| WO (1) | WO2018010250A1 (en) |
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| CN110096928A (en) * | 2018-01-30 | 2019-08-06 | 京东方科技集团股份有限公司 | Fingerprint identification device and display device |
| WO2020073771A1 (en) * | 2018-10-11 | 2020-04-16 | Boe Technology Group Co., Ltd. | Fingerprint sensing display apparatus, method of using fingerprint sensing display apparatus, and method of fabricating fingerprint sensing display apparatus |
| CN111274844A (en) * | 2018-12-04 | 2020-06-12 | 世界先进积体电路股份有限公司 | Semiconductor device and method of forming the same |
| WO2021042283A1 (en) * | 2019-09-04 | 2021-03-11 | 京东方科技集团股份有限公司 | Line recognition device and display device |
| CN112817074A (en) * | 2021-01-12 | 2021-05-18 | 苏州群烨新材料科技有限公司 | Optical collimator, manufacturing method thereof and imaging device with optical collimator |
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| KR102158811B1 (en) * | 2018-07-03 | 2020-09-22 | 주식회사 엘엠에스 | Optical disc for fingerprint recognition sensor and optical filter including the same |
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| CN112817074A (en) * | 2021-01-12 | 2021-05-18 | 苏州群烨新材料科技有限公司 | Optical collimator, manufacturing method thereof and imaging device with optical collimator |
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| WO2018010250A1 (en) | 2018-01-18 |
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Application publication date: 20180119 |