CN108664854A - Fingerprint imaging module and electronic equipment - Google Patents
Fingerprint imaging module and electronic equipment Download PDFInfo
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- CN108664854A CN108664854A CN201710204360.7A CN201710204360A CN108664854A CN 108664854 A CN108664854 A CN 108664854A CN 201710204360 A CN201710204360 A CN 201710204360A CN 108664854 A CN108664854 A CN 108664854A
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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
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Abstract
A kind of fingerprint imaging module and electronic equipment, the fingerprint imaging module include：Imaging sensor, for obtaining fingerprint image；Feel light source, be located in described image sensor, for generating thoughts and feelings detection light；Ducting layer positioned at the side of the thoughts and feelings light source and is set in described image sensor, is used for transmission the thoughts and feelings detection light；Touch-control detector is oppositely arranged positioned at the other side of the ducting layer and with the thoughts and feelings light source, and for detecting the thoughts and feelings transmitted through ducting layer detection light light intensity, and when the thoughts and feelings detects light light intensity decreasing, control described image sensor obtains fingerprint image.Technical solution of the present invention can effectively improve the success rate of finger detection, be conducive to the triggering success rate for improving touch function；And the appearance for accidentally touching phenomenon can be effectively reduced, be conducive to the performance for improving the fingerprint imaging module.
Description
Technical field
The present invention relates to fingerprint imaging field, more particularly to a kind of fingerprint imaging module and electronic equipment.
Background technology
Fingerprint identification technology collects the fingerprint image of human body by fingerprint imaging sensor, then with fingerprint recognition system
In have fingerprint imaging information be compared, to realize identification.Due to the use of convenience and somatic fingerprint it is unique
Property, fingerprint identification technology have been widely used in every field, such as：The field of safety check such as public security bureau, customs, the gate inhibition system of building
System and the consumer product areas such as PC and mobile phone etc..
Imaging mode used by fingerprint identification technology has the multiple technologies such as optical profile type, condenser type, ultrasonic type.Wherein one
Kind is that the fingerprint image of human body is acquired by optical imagery module.Optical fingerprint imaging modules include mainly：Cover sheet, light
It learns sensor, integrated chip (IC), flexible PCB (FPC) and electronic device (including light source led) on flexible PCB, lead
The critical pieces such as tabula rasa, upper protection shell and lower protection shell.Wherein optical sensor is to utilize amorphous silicon film transistor
(a-Si TFT), low-temperature polysilicon film transistor (LTPS TFT) or oxide semiconductor thin-film transistor (OS TFT) etc. half
Semiconductor process technology, makes on the glass substrate；Later encapsulation is realized by processes such as cutting, dispensing, bondings.
Currently, application of the fingerprint imaging sensor in mobile terminal device is unlocked using fingerprint.But due to
The limited battery capacity of mobile terminal extends stand-by time, therefore power management to reduce the energy consumption of fingerprint imaging sensor
Always mobile terminal develops a critically important part.
Touch function is integrated in fingerprint imaging module, is existing to judge whether the fingerprint imaging module is touched
There is a kind of effective voltage management method in technology.Finger detection is realized on fingerprint imaging module, when not detecting finger,
The fingerprint imaging module is set to enter suspend mode, to reduce power consumption；When detecting finger, the fingerprint imaging mould is waken up
Group makes it be in working condition from dormant state conversion, obtains fingerprint image.
But the fingerprint imaging module for being integrated with touch function in the prior art there is a problem of trigger success rate it is unstable.
Invention content
Problems solved by the invention is to provide a kind of fingerprint imaging module and electronic equipment, to improve the fingerprint imaging mould
The triggering success rate of group.
To solve the above problems, the present invention provides a kind of fingerprint imaging module, including：
Imaging sensor, for obtaining fingerprint image；Feel light source, be located in described image sensor, for generating sense
Feeler inspection surveys light；Ducting layer positioned at the side of the thoughts and feelings light source and is set in described image sensor, is used for transmission the sense
Feeler inspection surveys light；Touch-control detector is oppositely arranged positioned at the other side of the ducting layer and with the thoughts and feelings light source, for detecting warp
The thoughts and feelings of the ducting layer transmission detects light light intensity, and when the thoughts and feelings detects light light intensity decreasing, control described image sensing
Device obtains fingerprint image.
Optionally, described image sensor includes encapsulated layer；The ducting layer covers the encapsulation layer surface；The waveguide
The refractive index of layer material is more than the refractive index of the encapsulation layer material.
Optionally, the refractive index of the encapsulation layer material is in 1.3 to 1.5 ranges.
Optionally, the refractive index of the waveguide layer material is in 1.4 to 1.7 ranges.
Optionally, the material of the ducting layer is glass.
Optionally, the thickness of the ducting layer is within the scope of less than or equal to 1.0mm.
Optionally, the fingerprint imaging module further includes：Sensing face is touched for experiencing；The touch-control detector and institute
Distance is less than or equal to distance between the thoughts and feelings light source and the sensing face between stating sensing face.
Optionally, the fingerprint imaging module further includes：Imaging source, for generating imaging incident light, it is described be imaged into
It penetrates light and forms the reflected light for carrying finger print information in the sensing face；The touch-control detector is used to detect in the thoughts and feelings
When light light intensity decreasing, controls the imaging source and generate the imaging incident light, and control described in described image sensor acquisition
Reflected light；Described image sensor is for acquiring the reflected light to obtain the fingerprint image.
Optionally, the color of the imaging incident light is different from the thoughts and feelings detection color of light.
Optionally, the ducting layer is additionally operable to thoughts and feelings detection light described in scattered portion, to form imaging incident light；It is described at
The reflected light of finger print information is carried as incident light is formed in the sensing face；The touch-control detector is detected in the thoughts and feelings
When light light intensity decreasing, control described image sensor acquires the reflected light；Described image sensor is for acquiring the reflection
Light is to obtain the fingerprint image.
Optionally, the shape of the sensing face is rectangular；The thoughts and feelings light source be in strip, and with the rectangular sensing face
Side be arranged in parallel；The touch-control detector is in strip, opposite with the thoughts and feelings light source and be arranged in parallel.
Optionally, the shape of the sensing face is rectangular, have orthogonal first while and when second, and with first
The diagonal line that intersection point is connected while with second；The touch-control detector is L-shaped, including orthogonal first probe portion and second
Probe portion, first probe portion are arranged in parallel with first side, and second probe portion is arranged in parallel with second side；
The thoughts and feelings light source is located at the side that the touch-control detector is not arranged for the diagonal line.
Optionally, the thoughts and feelings light source is black light light source.
Optionally, the thoughts and feelings light source is infrared light supply.
Correspondingly, the present invention also provides a kind of electronic equipment, including：The fingerprint imaging module of the present invention.
Compared with prior art, technical scheme of the present invention has the following advantages：
The touch-control detector is used to sense the light intensity of the thoughts and feelings detection light transmitted through the ducting layer, passes through finger
To the influence that the thoughts and feelings detection light transmits in the ducting layer, the presence of finger is sensed；Therefore the touch-control detector pair
The detection of finger is not exposed to the influence of finger contact area, so the touch-control detector and the thoughts and feelings light source match reality
The way of existing touch function can effectively improve the success rate of finger detection, be conducive to the triggering success rate for improving touch function；
And only when finger has an impact the transmission of the thoughts and feelings detection light, touch-control detector institute the sense of access feeler inspection surveys light
Light intensity can just change, therefore by the touch-control detector and it is described thoughts and feelings light source match realize finger sensing do
Method can effectively reduce the appearance for accidentally touching phenomenon, be conducive to the performance for improving the fingerprint imaging module.
In alternative of the present invention, distance is less than or equal to the thoughts and feelings between the touch-control detector and the sensing face
Distance between light source and the sensing face；According to the light distribution of transmission ray in waveguide, can be visited by changing the touch-control
It surveys distance between device and the sensing face and adjusts the sensitivity that the fingerprint imaging module realizes finger detection, so as to effective
The appearance of problem is accidentally touched in control, is conducive to the usage experience for improving the fingerprint imaging module.
In alternative of the present invention, the ducting layer is additionally operable to described in scattered portion thoughts and feelings detection light, be imaged into
Penetrate light；The imaging incident light forms the reflected light for carrying finger print information in the sensing face；Described image sensor is used
In the acquisition reflected light to obtain fingerprint image.Therefore the thoughts and feelings detection light both detected for realizing finger, was additionally operable to reality
Existing fingerprint imaging is conducive to reduce fingerprint imaging mould so this way can effectively simplify the structure of fingerprint imaging module
The volume of group, is conducive to the raising of integrated level.
In alternative of the present invention, the material of the ducting layer is glass, i.e., the described ducting layer can be the fingerprint at
As the glass cover-plate of module.Therefore the glass cover-plate can play the role of the protection fingerprint imaging module hardware, moreover it is possible to
Enough play the role of ducting layer, so this way can simplify modular structure, be conducive to carry while realizing touch function
High yield reduces volume.
In alternative of the present invention, the thoughts and feelings light source is black light light source, i.e., the described thoughts and feelings detection light is invisible
Light, and thoughts and feelings detection light, during transmitted in the ducting layer, most energy are limited in the waveguide
In layer, therefore match by the touch-control detector and the thoughts and feelings light source that realize that the way of finger sensing can be realized described
The hiding setting of fingerprint imaging module is conducive to the aesthetics for improving the electronic equipment.
Description of the drawings
Fig. 1 is a kind of cross-sectional view of fingerprint imaging module；
Fig. 2 is the cross-sectional view of fingerprint imaging module first embodiment of the present invention；
Fig. 3 is light path schematic diagram of the embodiment of fingerprint imaging module shown in Fig. 2 when acquiring fingerprint image；
Fig. 4 is the overlooking structure diagram along the directions A in the embodiment of fingerprint imaging module shown in Fig. 2；
Fig. 5 is the schematic cross-sectional view of fingerprint imaging module second embodiment of the present invention；
Fig. 6 is the overlooking structure diagram along the directions B in the embodiment of fingerprint imaging module shown in Fig. 5.
Specific implementation mode
By background technology it is found that the fingerprint imaging module with touch function has triggering success rate shakiness in the prior art
Fixed problem.
With reference to figure 1, a kind of cross-sectional view of fingerprint imaging module is shown.
As shown in Figure 1, the fingerprint imaging module is super-thin optical fingerprint imaging modules.The fingerprint imaging module
Be by photoelectricity transformation principle realize fingerprint imaging, including：Light source 11, the optics area array sensor on the light source 11
12, the protective layer 13 on the optics area array sensor 12.
When acquiring fingerprint, finger 10 presses on protective layer 13；The incident light that light source 11 generates is in finger 10 and protection
Reflection and transmission occur for the contact interface of layer 13；It is formed by reflected light and penetrates protective layer 13, be projected to optics area array sensor
On 12；Optics area array sensor 12 acquires the reflected light, and carries out opto-electronic conversion and signal processing, realizes adopting for fingerprint image
Collection.The encapsulation of the optics area array sensor 12 mainly use after dicing by photoelectric sensor small pieces by sealing material with it is upper
Lid carries out fitting and realizes encapsulation.
In order to realize touch function on the fingerprint imaging module, it is arranged around the optics area array sensor 12 and touches
Touch circuit 14.Since touch-control circuit 14 is set to around the optics area array sensor 12, thus the touch-control circuit 14 with
The contact area of finger is limited, affects the detection to finger, to the problem for causing triggering success rate unstable.
Especially when the area of the fingerprint imaging module is larger, such as 2 refer to, 4 refer to or large-sized fingerprint such as the full palm
In imaging modules, the fingerprint imaging module is triggered by the touch-control circuit 14 being set to around the optics area array sensor 12
The success rate for obtaining fingerprint image is just lower.
And the touch-control circuit 14 be by forming capacitance structure with finger 10, to realize the detection of finger 10, because
This described touch-control circuit 14 is affected to the detection of finger 10 by environment, such as when there is water on fingerprint imaging module surface
When, triggering success rate is relatively low.
To solve the technical problem, the present invention provides a kind of fingerprint imaging module, passes through the touch-control detector and institute
It states thoughts and feelings light source and matches the success rate realized and can effectively improve finger detection to the detection of finger, be conducive to improve touch-control work(
The triggering success rate of energy；And the appearance for accidentally touching phenomenon can be effectively reduced, be conducive to improve the fingerprint imaging module
Performance.
To make the above purposes, features and advantages of the invention more obvious and understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
With reference to figure 2, the cross-sectional view of fingerprint imaging module first embodiment of the present invention is shown.
As shown in Fig. 2, the fingerprint imaging module includes：
Imaging sensor 110, for obtaining fingerprint image；Feel light source 120, be located in described image sensor 110, uses
Feel detection light 121 in generating；Ducting layer 130 positioned at the side of the thoughts and feelings light source 120 and is set to described image sensor
On 110, it is used for transmission the thoughts and feelings detection light 121；Touch-control detector 140, be located at the ducting layer 130 the other side and with institute
It states thoughts and feelings light source 120 to be oppositely arranged, for detecting the thoughts and feelings transmitted through the ducting layer 130 detection light 121, and in the thoughts and feelings
When detecting 121 light intensity decreasing of light, control described image sensor 110 obtains fingerprint image.
The touch-control detector 140 is used to sense the light of the thoughts and feelings detection light 121 transmitted through the ducting layer 130
By force, the influence transmitted in the ducting layer 130 to the thoughts and feelings detection light 121 by finger, senses the presence of finger；Therefore
The touch-control detector 140 is not exposed to the detection of finger the influence of finger contact area, so the touch-control detector 140
The success rate for realizing that the way of touch function can effectively improve finger detection is matched with the thoughts and feelings light source 120, is conducive to
Improve the triggering success rate of touch function；And the thoughts and feelings detection light 121 only transmission in the ducting layer 130, only
When finger has an impact the transmission of the thoughts and feelings detection light 121,140 the sense of access feeler inspections of the touch-control detector survey light
121 light intensity can just change, therefore match realization hand by the touch-control detector 140 and the thoughts and feelings light source 120
The way for referring to sensing can effectively reduce the appearance for accidentally touching phenomenon, be conducive to the performance for improving the fingerprint imaging module.
Described image sensor 110 is believed for acquiring the imaging for carrying finger print information, and by the light of the imaging
Number electric signal is converted to, to obtain fingerprint image.So in the present embodiment, the fingerprint imaging module be optical fingerprint at
As module.
Described image sensor 110 includes：Photosensitive layer 111 and the encapsulated layer 112 for covering the photosensitive layer 111.
Sensor devices are formed in the photosensitive layer 111, for acquiring the imaging to obtain fingerprint image.Specifically
, the sensor devices can be photodiode.
The encapsulated layer 112 avoids the photosensitive layer 111 from being exposed to for the photosensitive layer 111 and external environment to be isolated
In external environment, to improve the stability of described image sensor 110.Specifically, the material of the encapsulated layer 112 is oxidation
The transparent encapsulation materials such as silicon, silicon nitride or silicon oxynitride.
In conjunction with reference to figure 3, show the embodiment of fingerprint imaging module shown in Fig. 2 when acquiring fingerprint image light path signal
Figure.
As shown in Figures 2 and 3, in the present embodiment, the fingerprint imaging module further includes：Imaging source 160, for generating
Imaging incident light 161.
In the present embodiment, the imaging source 160 is area source, including：Including light emitting diode (not shown) and
Light guide plate (not shown) positioned at the light emitting diode side.The light emitting diode is used to form initial light；It is described
Initial light caused by light emitting diode is projected into the light guide plate, and light distribution is reflected to form evenly through the light guide plate
Imaging incident light 161.Set the imaging source 160 to the way of area source, can effectively improve it is described be imaged into
The uniformity of light 161 is penetrated, the incident angle of imaging incident light 161 can be effectively reduced, is conducive to improve obtained fingerprint image
Quality.
In other embodiments of the invention, the imaging source may be the light of the other forms such as linear light source or point light source
Source.For example, the imaging source can be single light emitting diode.
The imaging source 160 can be that visible light source may be black light light source, that is to say, that the imaging
Incident light 161 can be visible light, or black light.Specifically, the imaging incident light 161 can be near ultraviolet
The colors such as light, purple light, blue light, green light, sodium yellow, red light, near infrared light or white light.It is described in the present embodiment
Imaging source 160 includes white light emitting diode, i.e., the described imaging incident light 161 is white light.
In addition, the fingerprint imaging module further includes：Sensing face 150 is touched for experiencing.The imaging incident light 161
The reflected light 162 for carrying finger print information is formed in the sensing face 150；Described image sensor 110 is described for acquiring
Reflected light 162 is to obtain the fingerprint image.
Light source 120 is felt, for generating thoughts and feelings detection light 121, optically to realize that finger detects.
The thoughts and feelings light source 120 is located in described image sensor 110, and is set to the side of the sensing face 150, institute
The light-emitting surface of thoughts and feelings light source 120 is stated towards the sensing face 150.Therefore in the plane of the parallel sensing face 150, the thoughts and feelings
Light 121 is detected to be emitted from the sensing face 150, it can be across the sensing face 150.So detecting light 121 by the thoughts and feelings
The way of opponent's fingering row detection is not exposed to the influence of finger contact area, so as to effectively improve the success of finger detection
Rate is conducive to the triggering success rate for improving touch function.
In the present embodiment, the thoughts and feelings light source 120 is black light light source (for example, infrared light supply or ultraviolet source),
That is the thoughts and feelings detection light 121 is black light (for example, infrared light or ultraviolet light).The thoughts and feelings light source 120 is arranged
The hiding setting that the fingerprint imaging module can be realized for the way of black light light source is conducive to integrate the fingerprint imaging
The appearance design of module electronic equipment.
Specifically, the thoughts and feelings light source 120 is infrared light supply, so thoughts and feelings detection light 121 is infrared light.Infrared letter
Number have high stability, to the stronger advantage of adaptability of environmental change (temperature, humidity etc.), so by the thoughts and feelings light source
120 are set as the way of infrared light supply, can be effectively improved the adaptability of the fingerprint imaging module, are conducive to improve the finger
The stability of line imaging modules.
It should be noted that the color of the thoughts and feelings detection light is different from the color of the imaging incident light, that is to say, that
The wave-length coverage of wave-length coverage and the imaging incident light of the thoughts and feelings detection light simultaneously differs.In the present embodiment, it is described at
Picture incident light is white light, and the thoughts and feelings detection light is infrared light.The thoughts and feelings is detected into light and the imaging incident light is set as
The way of different colours can effectively reduce the influence that the thoughts and feelings detection light acquires imaging sensor reflected light, Neng Gouyou
The noise signal of the inhibition described image sensor of effect is conducive to the signal-to-noise ratio for improving the fingerprint imaging module, is conducive to height
The acquisition of quality fingerprinting image.
In conjunction with the overlooking structure diagram with reference to figure 4, shown in the embodiment of fingerprint imaging module shown in Fig. 2 along the directions A.
In the present embodiment, the shape of the sensing face 150 is rectangular；The thoughts and feelings light source 120 be in strip, and with it is described
The side of rectangular sensing face 150 is arranged in parallel.Specifically, the shape of the sensing face 150 is rectangle, the thoughts and feelings light source 120
It is parallel to the long side of the rectangle sensing face 150.In other embodiments of the invention, the thoughts and feelings light source 120 can also be parallel
With the broadside of the rectangle sensing face.
Strip thoughts and feelings light source 120 is arranged in parallel to the way on 150 side of the sensing face, the sense can be made
Feeler inspection is surveyed light 121 and is distributed in the range of the entire sensing face 150, so as to effectively improve the success rate of finger detection,
The expansion for being conducive to finger investigative range is conducive to the imaging area for expanding the fingerprint imaging module.
The ducting layer 130 is used for transmission thoughts and feelings detection light.
The ducting layer 130 is located in described image sensor 110, and the thoughts and feelings light source 120 is located at the ducting layer 130
Side, and the light-emitting surface of the thoughts and feelings light source 120 is toward the ducting layer 130.So the thoughts and feelings detects light 121 from described
It after feeling the light-emitting surface outgoing of light source 120, transmits in the ducting layer 130, by the conduction of the ducting layer 130 to the waveguide
Side of the layer 130 far from the thoughts and feelings light source 120.
In addition, in the present embodiment, the ducting layer 130 is additionally operable to directly connect backwards to the surface of described image sensor 110
By touching to carry out fingerprint sensing, i.e., the described ducting layer 130 is the sensing face backwards to the surface of described image sensor 110
150.So the ducting layer 130 also provides for the sensing face 150.
In the present embodiment, described image sensor 110 includes photosensitive layer 111 and encapsulated layer 112, and the ducting layer 130 covers
Cover 112 surface of the encapsulated layer；So the refractive index of 130 material of the ducting layer is more than the refraction of 112 material of the encapsulated layer
Rate.The material of the ducting layer 130 is set as the way that refractive index is more than 120 material of the encapsulated layer, can effectively reduce institute
The probability that thoughts and feelings detection light 121 is reflected in the interface of the ducting layer 130 and the encapsulated layer 112 is stated, institute can be made
It states touch-control and detects the transmission that light 121 is stablized in the ducting layer 130, be conducive to the realization of touch function.
Specifically, since the material of the encapsulated layer 112 is the transparent encapsulation materials such as UV glue, the encapsulated layer 112
The refractive index of material is in 1.3 to 1.5 ranges.Set the material of the encapsulated layer 112 to the way of transparent encapsulation material, energy
Enough make the encapsulated layer 112 as the photosensitive layer 111, formed by semiconductor fabrication process, so as to effectively subtract
Few photosensitive layer 111 is exposed to the time in external environment, is conducive to the performance for improving the photosensitive layer 111.It needs to illustrate
, in other embodiments of the invention, the material of the encapsulated layer may be arranged as silica, silicon nitride or silicon oxynitride etc.
Other transparent encapsulation materials.
So correspondingly, the refractive index of 130 material of the ducting layer is in 1.4 to 1.7 ranges.It is described in the present embodiment
The material of ducting layer 130 is glass.It sets the material of the ducting layer 130 to the way of glass, can realize the waveguide
The waveguide function of 130 transmission of the layer thoughts and feelings detection light 121, so as to realize the realization of touch function；And glass has
Comparable mechanical strength, therefore the material of the ducting layer 130 is set as the way of glass and the ducting layer 130 can also be made to rise
To the effect of glass cover-plate, realizes and protect the work(of imaging sensor 110 and other hardware devices in the fingerprint imaging module
Can, be conducive to the simplification of modular structure, be conducive to improve yield, reduce volume；So that the ducting layer 130 is played glass cover in addition
The effect of plate, that is to say, that technical solution of the present invention is not necessarily to that the manufacturing can be completed to the larger change of existing producing line progress,
Without increasing additional technique and cost.
It should be noted that the thickness d (as shown in Figure 2) of the ducting layer 130 should not it is too big also should not be too small.
If the thickness d of the ducting layer 130 is too small, the thoughts and feelings may be influenced and detect light 121 in the waveguide
Transmission in layer 130, may influence the smooth realization of touch function；If the thickness d of the ducting layer 130 is too big, can
The problem of capable of causing waste of material and increasing technology difficulty, and if 130 thickness d of the ducting layer be also possible to greatly very much can shadow
The acquisition of snap line imaging modules fingerprint image, will increase fingerprint image and the possibility of deformation occurs, be unfavorable for high quality fingerprint image
The acquisition of picture.Specifically, in the present embodiment, the thickness d of the ducting layer 130 is less than or equal to 1.0mm.
The touch-control detector 140 is used to detect the thoughts and feelings transmitted through the ducting layer 130 and detects 121 light intensity of light, and
When thoughts and feelings detection 121 light intensity decreasing of light, the presence of finger is judged, fingerprint is obtained to control described image sensor 110
Image.
It is described thoughts and feelings detector 140 be located at the ducting layer 130 far from it is described feel light source 110 side, and with it is described
Thoughts and feelings light source 110 is oppositely arranged.So the thoughts and feelings transmitted in the ducting layer 130 detects light 121, conducting to described
It when ducting layer 130 is far from thoughts and feelings 110 side of light source, is emitted from the ducting layer 130, to by the thoughts and feelings detector
140 acquisitions, to obtain the light intensity of the thoughts and feelings detection light 121.
As shown in Fig. 2, when not having finger on the thoughts and feelings face 150, the thoughts and feelings detects light 121 in the ducting layer
It is totally reflected in 130 upper and lower surfaces, to realize that the transmission in the ducting layer 130, the thoughts and feelings detector 140 acquire
The thoughts and feelings detection light 121 arrived has benchmark light intensity.
In the present embodiment, the sensing face 150 be the ducting layer 130 backwards to described image sensor 110 surface,
So as shown in figure 3, when the thoughts and feelings face 150 is touched by finger, finger directly presses on the surface of the ducting layer 130
On.
Since propagation of the thoughts and feelings detection light 121 in the ducting layer 130 is realized by total reflection principle, i.e.,
The thoughts and feelings detection light 121 is totally reflected on the surface that the ducting layer 130 is disposed opposite to each other, to realize in the waveguide
Conduction in layer 130.
The refractive index of finger surface oil layer is higher.Finger directly presses when on 130 surface of the ducting layer, the oil
At the position that lipid layer and the ducting layer 130 are in contact, thoughts and feelings detection light 121 can not be totally reflected, that is to say, that part institute
It states thoughts and feelings detection light 121 and refraction and reflection, remaining portion occurs at the position that the oil layer and the ducting layer 130 contact
Divide the thoughts and feelings detection light 121 that reflection can occur to continue to propagate.So the presence of finger can destroy the thoughts and feelings detection light 121
The condition being totally reflected in the ducting layer 130, to cause the thoughts and feelings propagated in the ducting layer 130 to detect light 121
The weakening of light intensity.
Therefore when the sensing face 150 is touched by finger, light 121 is detected through the thoughts and feelings that the ducting layer 130 is propagated
Light intensity is less than the benchmark light intensity, so when the light intensity for the thoughts and feelings detection light 121 that the touch-control detector 140 is acquired is less than institute
Benchmark light intensity is stated, i.e., when the described thoughts and feelings detects 121 light intensity decreasing of light, the touch-control detector can judge the sensing face 150
On there are finger, need to carry out fingerprint imaging.
As shown in figure 3, in the present embodiment, the fingerprint imaging module further includes：Imaging source 160.So in the sense
Feeler inspection survey 121 light intensity decreasing of light when, the touch-control detector 140 for control the imaging source 160 generate it is described be imaged into
Light 161 is penetrated, and controls described image sensor 110 and acquires the reflected light 162；Described image sensor 110 is for acquiring institute
Reflected light 162 is stated to obtain the fingerprint image.
Since the touch-control detector 140 and the touch-control light source 120 are located at the both sides of the ducting layer 130, pass through hand
Refer to the influence transmitted in the ducting layer 130 to the thoughts and feelings detection light 121, senses the presence of finger.So skill of the present invention
Art scheme is not influenced by finger contact area, so the success rate of finger detection can be effectively improved, is conducive to improve and be touched
Control the triggering success rate of function.
And only when finger is in contact with 130 surface of the ducting layer, the total reflection item of the thoughts and feelings detection light 121
Part can be just destroyed, i.e., only when finger is in contact with 130 surface of the ducting layer, the touch-control detector is felt
The light intensity of detection light can just change, therefore technical solution of the present invention can effectively reduce the appearance for accidentally touching phenomenon, be conducive to
Improve the performance of the fingerprint imaging module.
With continued reference to Fig. 2, in the present embodiment, distance h2 is less than between the touch-control detector 140 and the sensing face 150
Or equal to distance h1 between the thoughts and feelings light source 120 and the sensing face 150.So compared with the thoughts and feelings light source 120, it is described
Touch-control detector 140 is closer to the sensing face 150.
The property transmitted in waveguide according to light, on the direction of the vertical sensing face 150, the thoughts and feelings detects light
121 light intensity is gradually reduced to optical axis both sides.In the present embodiment, the optical axis is parallel to the sensing face 150, so when described
There is no finger on thoughts and feelings face 150, when the touch-control detector 140 is disposed in proximity to the position of the sensing face 150, the sense
The light intensity for touching the thoughts and feelings detection light 121 that detector 140 is obtained is smaller；When the sensing face 150 is touched by finger, the sense
Probing is surveyed the variation of 121 light intensity of light and is become apparent from.So the touch-control detector 140 is disposed in proximity to doing for the sensing face 150
Method can effectively improve the sensitivity of finger detection；And by changing the touch-control detector 140 and the sensing face 150
The distance between adjustment finger detection sensitivity, can effectively inhibit accidentally touch problem appearance.
In conjunction with reference to figure 4, in the present embodiment, the shape of the sensing face 150 is rectangular；The thoughts and feelings light source 120 is in length
Strip, and be arranged in parallel with the side of the rectangular sensing face 150；So the touch-control detector 140 is in strip, with the sense
It touches light source 120 relatively and is arranged in parallel.This way can make the thoughts and feelings detector 140 and 120 finger of thoughts and feelings light source
The entire sensing face of the range throughout of detection, so as to effectively improve the success that the fingerprint imaging module detects finger
Rate advantageously ensures that triggering success rate.And this way can also make the range that the fingerprint imaging module detects finger
Expand, can realize touch function in large area fingerprint imaging module.
With reference to figure 5, the schematic cross-sectional view of fingerprint imaging module second embodiment of the present invention is shown.
The present embodiment is identical with the first embodiment place, and details are not described herein by the present invention.The present embodiment and previous embodiment
The difference is that in the present embodiment, the ducting layer 230 is additionally operable to thoughts and feelings detection light 221 described in scattered portion, with formed at
As incident light 261；The imaging incident light 261 forms the reflected light 262 for carrying finger print information in the sensing face 250.
So the touch-control detector 240 controls described image sensor when the thoughts and feelings detects 221 light intensity decreasing of light
210 acquire the reflected light 262；Described image sensor 210 is for acquiring the reflected light 262 to obtain the fingerprint image
Picture.
As shown in figure 5, when being projected in the sensing face 250, the imaging incident light 261 can occur to reflect and reflect：
It is projected to the imaging incident light 261 at fingerprint ridge position more to reflect, be projected to described at fingerprint valley position
Imaging incident light 261 more reflects；So being formed by reflected light 262 in the sensing face 250 carries fingerprint
Information；Described image sensor 210 is by acquiring the reflected light 262 to obtain fingerprint image.
So in the present embodiment, the ducting layer 230 and the thoughts and feelings light source 220 are used for together as the fingerprint image
It being formed and imaging incident light is provided, i.e., the described thoughts and feelings detection light 221 both detected for realizing finger, was additionally operable to realize fingerprint imaging,
So this way can effectively simplify the structure of fingerprint imaging module, is conducive to the volume for reducing fingerprint imaging module, has
Conducive to the raising of integrated level.
In conjunction with the overlooking structure diagram with reference to figure 6, shown in the embodiment of fingerprint imaging module shown in Fig. 5 along the directions B.
In addition, in the present embodiment, the sensing face 250 is rectangular, with orthogonal first at 251 and second
252 and with the described first diagonal line 253 that 252 intersection points are connected at 251 and second.
In the present embodiment, the touch-control detector 240 is L-shaped, including orthogonal first probe portion 241 and second is visited
Survey portion 242, first probe portion 241 are arranged in parallel with first side 251, second probe portion 242 and described second
Side 252 is arranged in parallel；The thoughts and feelings light source 220 is located at the side that the touch-control detector 240 is not arranged for the diagonal line 253.
This way can make range throughout that the thoughts and feelings detection light detect finger entirely sensing face, be conducive to finger and detect
The raising of success rate is conducive to the guarantee for triggering success rate；But also the fingerprint imaging module imaging area can be conducive to
Expansion.
Correspondingly, the present invention also provides a kind of electronic equipment, including：Fingerprint imaging module of the present invention.
The fingerprint imaging module is for acquiring fingerprint image.The fingerprint imaging module is fingerprint imaging mould of the present invention
Group, specific technical solution refer to the specific embodiment of aforementioned fingerprint imaging modules, and details are not described herein by the present invention.The electronics is set
For according to the obtained fingerprint image of fingerprint imaging module, fingerprint recognition is carried out.
When without carrying out fingerprint sensing, the thoughts and feelings detection light transmitted in the ducting layer is not influenced by finger, institute
Survey that light light intensity is larger, and the touch-control detector judges that finger is not present with touch-control detector institute the sense of access feeler inspection, without into
Row fingerprint sensing.
When needing to carry out fingerprint sensing, the presence of the finger can make the part thoughts and feelings detection light in the ducting layer
It can not be totally reflected, therefore the light intensity of touch-control detector institute the sense of access feeler inspection survey light will appear decrease, the touch-control is visited
Surveying device can judge, there are finger, to need to carry out fingerprint sensing.
So the touch-control detector and the thoughts and feelings light source match and realize that the way of touch function can effectively improve
The success rate of finger detection is conducive to the triggering success rate for improving touch function；And only when finger detects the thoughts and feelings
When the transmission of light has an impact, the light intensity that touch-control detector institute the sense of access feeler inspection surveys light can just change, therefore use
The fingerprint imaging module can effectively reduce the appearance for accidentally touching phenomenon, be conducive to the property for improving the fingerprint imaging module
Energy.
In the present embodiment, the electronic equipment is mobile phone or tablet computer.The thoughts and feelings light source and the touch-control detector
It can realize and integrate with module edge, to realize hiding setting and the ultrathin of the fingerprint imaging module, be conducive to carry
The integrated level of the high electronic equipment.
To sum up, the touch-control detector is used to sense the light intensity of the thoughts and feelings detection light transmitted through the ducting layer, leads to
The influence that finger transmits the thoughts and feelings detection light in the ducting layer is crossed, the presence of finger is sensed；Therefore the touch-control is visited
The influence that device is not exposed to the detection of finger finger contact area is surveyed, so the touch-control detector and the thoughts and feelings light source phase
Cooperation realize touch function way can effectively improve finger detection success rate, be conducive to improve touch function triggering at
Power；And only when finger has an impact the transmission of the thoughts and feelings detection light, the touch-control detector is felt
The light intensity of detection light can just change, therefore matched by the touch-control detector and the thoughts and feelings light source and realize finger sense
The way of survey can effectively reduce the appearance for accidentally touching phenomenon, be conducive to the performance for improving the fingerprint imaging module；Moreover,
In alternative of the present invention, distance is less than or equal to the thoughts and feelings light source and institute between the touch-control detector and the sensing face
State distance between sensing face；It, can be by changing the touch-control detector and institute according to the light distribution of transmission ray in waveguide
Distance adjusts the sensitivity that the fingerprint imaging module realizes finger detection between stating sensing face, is accidentally touched so as to effectively control
The appearance of problem is conducive to the usage experience for improving the fingerprint imaging module；In addition, in alternative of the present invention, the wave
Conducting shell is additionally operable to thoughts and feelings detection light described in scattered portion, to form imaging incident light；The imaging incident light is in the sensing face
It is upper to form the reflected light for carrying finger print information；Described image sensor is for acquiring the reflected light to obtain fingerprint image.
Therefore the thoughts and feelings detection light both detected for realizing finger, was additionally operable to realize fingerprint imaging, so this way can be effective
Simplification fingerprint imaging module structure, be conducive to reduce fingerprint imaging module volume, be conducive to the raising of integrated level；Separately
Outside, in alternative of the present invention, the material of the ducting layer is glass, i.e., the described ducting layer can be the fingerprint imaging module
Glass cover-plate.Therefore the glass cover-plate can play the role of the protection fingerprint imaging module hardware, additionally it is possible to play
The effect of ducting layer, so this way can simplify modular structure, be conducive to improve good while realizing touch function
Rate reduces volume；Moreover, in alternative of the present invention, the thoughts and feelings light source is black light light source, i.e., the described thoughts and feelings detects light
For black light, and during thoughts and feelings detection light transmits in the ducting layer, most energy are limited in
In the ducting layer, therefore is matched by the touch-control detector and the thoughts and feelings light source and realize that the way of finger sensing can
The hiding setting for realizing the fingerprint imaging module is conducive to the aesthetics for improving the electronic equipment.
Although present disclosure is as above, present invention is not limited to this.Any those skilled in the art are not departing from this
It 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
Subject to the range of restriction.
Claims (15)
1. a kind of fingerprint imaging module, which is characterized in that including：
Imaging sensor, for obtaining fingerprint image；
Feel light source, be located in described image sensor, for generating thoughts and feelings detection light；
Ducting layer positioned at the side of the thoughts and feelings light source and is set in described image sensor, is used for transmission the thoughts and feelings and visits
Survey light；
Touch-control detector is oppositely arranged positioned at the other side of the ducting layer and with the thoughts and feelings light source, for detecting described in warp
The thoughts and feelings of ducting layer transmission detects light light intensity, and when the thoughts and feelings detects light light intensity decreasing, and control described image sensor obtains
Obtain fingerprint image.
2. fingerprint imaging module as described in claim 1, which is characterized in that described image sensor includes encapsulated layer；
The ducting layer covers the encapsulation layer surface；
The refractive index of the waveguide layer material is more than the refractive index of the encapsulation layer material.
3. fingerprint imaging module as claimed in claim 2, which is characterized in that the refractive index of the encapsulation layer material is arrived 1.3
In 1.5 ranges.
4. fingerprint imaging module as claimed in claim 2, which is characterized in that the refractive index of the waveguide layer material is arrived 1.4
In 1.7 ranges.
5. fingerprint imaging module as described in claim 1, which is characterized in that the material of the ducting layer is glass.
6. fingerprint imaging module as described in claim 1, which is characterized in that the thickness of the ducting layer is less than or equal to
1.0mm。
7. fingerprint imaging module as described in claim 1, which is characterized in that the fingerprint imaging module further includes：Sensing face,
It is touched for experiencing；
Distance is less than or equal between the thoughts and feelings light source and the sensing face between the touch-control detector and the sensing face
Distance.
8. fingerprint imaging module as claimed in claim 7, which is characterized in that the fingerprint imaging module further includes：Imaging
Source, for generating imaging incident light, the imaging incident light forms the reflected light for carrying finger print information in the sensing face；
The touch-control detector is used to, when the thoughts and feelings detects light light intensity decreasing, control the imaging source and generate the imaging
Incident light, and control described image sensor and acquire the reflected light；
Described image sensor is for acquiring the reflected light to obtain the fingerprint image.
9. fingerprint imaging module as claimed in claim 8, which is characterized in that the color of the imaging incident light and the thoughts and feelings
The color for detecting light is different.
10. fingerprint imaging module as claimed in claim 7, which is characterized in that the ducting layer is additionally operable to described in scattered portion
Thoughts and feelings detection light, to form imaging incident light；The imaging incident light forms in the sensing face and carries finger print information
Reflected light；
For the touch-control detector when the thoughts and feelings detects light light intensity decreasing, control described image sensor acquires the reflection
Light；
Described image sensor is for acquiring the reflected light to obtain the fingerprint image.
11. fingerprint imaging module as claimed in claim 7, which is characterized in that the shape of the sensing face is rectangular；
The thoughts and feelings light source is in strip, and is arranged in parallel with the side of the rectangular sensing face；
The touch-control detector is in strip, opposite with the thoughts and feelings light source and be arranged in parallel.
12. fingerprint imaging module as claimed in claim 7, which is characterized in that the shape of the sensing face is rectangular, has phase
Mutually vertical first while and when second, and with first while and intersection point is connected when second diagonal line；
The touch-control detector is L-shaped, including orthogonal first probe portion and the second probe portion, first probe portion with
First side is arranged in parallel, and second probe portion is arranged in parallel with second side；
The thoughts and feelings light source is located at the side that the touch-control detector is not arranged for the diagonal line.
13. fingerprint imaging module as described in claim 1, which is characterized in that the thoughts and feelings light source is black light light source.
14. fingerprint imaging module as described in claim 1, which is characterized in that the thoughts and feelings light source is infrared light supply.
15. a kind of electronic equipment, which is characterized in that including：Such as claim 1 to claim 14 any one claim institute
The fingerprint imaging module stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710204360.7A CN108664854A (en) | 2017-03-30 | 2017-03-30 | Fingerprint imaging module and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710204360.7A CN108664854A (en) | 2017-03-30 | 2017-03-30 | Fingerprint imaging module and electronic equipment |
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Family
ID=63785577
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| CN201710204360.7A Pending CN108664854A (en) | 2017-03-30 | 2017-03-30 | Fingerprint imaging module and electronic equipment |
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