CN110674795A

CN110674795A - Image acquisition optical structure, optical sensor, image acquisition method and electronic equipment for biological feature recognition

Info

Publication number: CN110674795A
Application number: CN201911060068.8A
Authority: CN
Inventors: 杨成龙; 姜洪霖; 黄昊
Original assignee: Shanghai Figorn Microelectronics Technology Co Ltd; CHENGDU FEIENGEER MICROELECTRONICS TECHNOLOGY Co Ltd
Current assignee: SHANGHAI FEIGEEN MICROELECTRONICS TECHNOLOGY Co.,Ltd.
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-01-10

Abstract

The invention discloses an image acquisition optical structure, an optical sensor, an image acquisition method and electronic equipment for biological feature recognition, wherein the image acquisition optical structure comprises a plurality of Microlens areas and an optical sensor which is positioned below the Microlens areas and is provided with a plurality of pixel point areas, the area of 1 Microlens area corresponds to the area formed by combining more than 2 pixel point areas in the Microlens areas and the pixel point areas, and the Microlens areas are coaxial with the photoelectric sensing areas of 1 pixel point area which is just opposite to the lower part of the Microlens area. The invention can enhance the optical signal quantity of a single pixel point and reduce the data transmission quantity of the image.

Description

Image acquisition optical structure, optical sensor, image acquisition method and electronic equipment for biological feature recognition

Technical Field

The invention belongs to the field of biological feature recognition, and particularly relates to an image acquisition optical structure, an optical sensor, an image acquisition method and electronic equipment for biological feature recognition.

Background

Along with the increasing requirements of people on camera pixels, the size of a pixel point is smaller and smaller, and in order to increase the light sensitivity of the small pixel point, a micro-lens array is commonly used in a CMOS light sensitive chip.

The structure of the microlens array module is as shown in fig. 1 and 2, and in fig. 1 and 2, each microlens (mcirotens) 400 corresponds to a pixel area 810, and light is converged on a photoelectric sensing area of the pixel area 810 of the optical sensor 800 by using the light converging effect of the microlens 400, so that the sensing capability of a single pixel is increased, and the light passes through the optical material layer 600 in the transmission and convergence process. Since each microlens 400 corresponds to one pixel region 810, the area of the microlens 400 is less than or equal to the sum of the area of a single pixel and the area between two adjacent pixels.

The standard for biometric devices commonly used in the industry today is that the feature point density needs to be greater than 508DPI, i.e. the pitch of each feature point needs to be less than 50um, at least in the 3.2mm by 3.2mm identification area. When the existing CMOS chip with the Microlens array is directly used for biological characteristic recognition equipment under an OLED screen, the CMOS cannot clearly image biological characteristic images due to the inherent thickness of the OLED screen, cannot generate the characteristic images and cannot meet the requirement of biological characteristic recognition.

Disclosure of Invention

In view of the above drawbacks, in one aspect, the present invention provides an optical image capturing structure for biometric identification, including a plurality of Microlens regions and an optical sensor with a plurality of pixel regions located below the Microlens regions, the optical sensor including: in the plurality of the Microlens areas and the plurality of the pixel point areas, the area of 1 Microlens area corresponds to the area formed by combining more than 2 pixel point areas, and the Microlens area is coaxial with the photoelectric sensing area of the 1 pixel point area which is just opposite to the lower part of the Microlens area.

The image acquisition optical structure for biological feature recognition collects optical signals of more than 2 pixel point regions on 1 pixel point, enhances the optical signals of the pixel point, and physically isolates the pixel points around the pixel point, so that the amount of the pixel point optical signals of a corresponding response region is increased, and the data volume of an image is reduced.

Further, the image acquisition optical structure for biological feature recognition further comprises a parasitic light prevention diaphragm and a field diaphragm, wherein the parasitic light prevention diaphragm and the field diaphragm are located between the Microlens areas and the optical sensor, the parasitic light prevention diaphragm is connected between the two adjacent Microlens areas, one end of the parasitic light prevention diaphragm extends into the lower part of one Microlens area of the two adjacent Microlens areas, the other end of the parasitic light prevention diaphragm extends into the lower part of the other Microlens area, the lower part of each parasitic light prevention diaphragm corresponds to the field diaphragm coaxial with the field diaphragm, the light passing hole area of the field diaphragm is smaller than that of the parasitic light prevention diaphragm, and an optical channel is formed between the light passing hole of the parasitic light prevention diaphragm and the light passing hole of the field diaphragm coaxial with the light passing hole.

Further, the biometric image capturing optical structure further comprises an optical filler material layer located between the Microlens area and the optical sensor.

Further, the field stop is located at a conjugate image plane position in the Microlens area, and the field stop controls the field Fov of the Microlens to be: 4 DEG < Fov < 12 deg.

Further, the optical sensor is a CMOS photosensitive chip.

Further, the area of 1 Microlens region corresponds to the area combined by 4 pixel point regions, and the pixel point regions are arranged in 2 x 2.

Further, the area of the Microlens area 400 is larger than the area of 1 pixel point area and smaller than the area formed by combining 4 pixel point areas.

This mode is through collecting the light signal that the area is 4 pixel regions on 1 pixel, strengthens the light signal of this pixel to pixel around this pixel carries out the optical signal isolation in physics, has increased its corresponding response area pixel light signal volume, reduces the transmission volume of data, and data transmission volume has reduced 3 n.

Further, the area of the 1 Microlens area corresponds to the area combined by the 9 pixel point areas, and the pixel point areas are arranged in 3 × 3.

Further, the area of the Microlens area is larger than the area of the 4 pixel point areas and is smaller than the area formed by combining the 9 pixel point areas.

This mode is through collecting the light signal that the area is 9 pixel regions on 1 pixel, strengthens the light signal of this pixel to pixel around this pixel carries out the optical signal isolation in physics, has increased its corresponding response area pixel light signal volume, reduces the transmission volume of data, and data transmission volume has reduced 8 n.

On one hand, the invention also provides an optical sensor of the image acquisition optical structure special for the biological characteristic identification, wherein a plurality of pixel points are distributed on the optical sensor, the pixel points are pixel points capable of generating signals in the biological characteristic identification process, the distance between two adjacent pixel points capable of generating signals in the biological characteristic identification process is d, and the pixel point size which is 1 time is less than d and less than 50 um.

In one aspect, the present invention further provides an image capturing method for biometric identification, where the image capturing method includes: after light carrying biological characteristic identification passes through 1 Microlens, a signal is only generated by sensing one pixel point corresponding to the Microlens, and the pixel points around the pixel point cannot receive the optical signal and carry out silent processing on the optical signal.

On one hand, the invention also provides electronic equipment which comprises a display screen, wherein a biological identification induction area is arranged on the display screen, an image acquisition module for biological characteristic identification is arranged below the biological identification induction area, the image acquisition module for biological characteristic identification comprises an image acquisition optical structure for biological characteristic identification and an image acquisition circuit board for biological characteristic identification, and the image acquisition optical structure for biological characteristic identification is the image acquisition optical structure for biological characteristic identification.

Compared with the prior art, the invention has the beneficial effects that:

the invention utilizes the processing technology of the micro lens on the CMOS photosensitive chip to develop a new image acquisition method aiming at the requirement of biological characteristic identification, can realize the enhancement of the optical signal quantity of a single pixel point, and can reduce the data quantity of the image.

The optical structure for collecting the biological characteristic identification image can increase the optical signal quantity of the pixel points in the response area and reduce the data quantity of the collected image. The invention can strengthen the optical signal of the pixel point by collecting the optical signal of 4 or 9 pixel point regions on 1 pixel point, and can isolate the optical signal of the pixel point around the pixel point physically. The biological characteristic recognition image acquisition optical structure increases the pixel point optical signal quantity of the corresponding response area, and performs silent processing on the pixel points of the non-response area corresponding to the optical structure on the circuit, thereby reducing the transmission quantity of data.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic diagram of the background art of the present invention;

FIG. 2 is a schematic top view of the corresponding relationship between Mcirolens and pixels in FIG. 1;

FIG. 3 is a schematic cross-sectional view of an image capturing optical structure for biometric identification according to example 1;

FIG. 4 is a schematic diagram of the relationship between the Microlens area and the pixel area in FIG. 3 (four in one);

FIG. 5 is a schematic view of the embodiment 1;

FIG. 6 is a diagram showing the effect of practical image acquisition in example 1;

FIG. 7 is a schematic cross-sectional view of an image capturing optical structure for biometric identification according to example 2; (ii) a

FIG. 8 is a schematic diagram of the relationship between the Microlens area and the pixel area in FIG. 7 (nine in one);

FIG. 9 is a schematic view of the embodiment 2;

FIG. 10 is a schematic perspective view of an electronic device according to the present invention;

FIG. 11 is a schematic cross-sectional view at the biometric sensing zone of FIG. 10;

fig. 12 is an operational schematic of the optical structure of fig. 10.

Description of reference numerals: mobile phone display-200; mobile phone key-210; reflected light carrying fingerprint information-211; high angle reflected rays beyond the Microlens' field of view-212; handset-related sensors-220; a biometric sensing zone 299; an infrared filter-300; microlens area-400; stray light prevention diaphragm-500; a layer of optical fill material-600; field stop-700; an optical channel-710; an optical sensor-800; pixel area-810; signal producing pixel-811; pixel point with no signal generated-812; a circuit board-1010; and (4) a reinforced steel plate-1020.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

As a common application scenario, the optical structure for capturing a biometric image provided in the embodiment of the present application can be applied to a smart phone, a tablet computer, and other mobile terminals or other terminal devices having a display screen, and the technical scheme of the embodiment of the present application can be applied to a biometric technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and living body recognition. For convenience of explanation, the fingerprint identification technology is described as an example below.

More specifically, in the terminal device, the optical fingerprint recognition device may be disposed in a partial area or an entire area below the display screen, thereby forming an off-screen optical fingerprint system.

Example 1

Fig. 3 is a schematic cross-sectional view of an image capturing optical structure for biometric identification according to the present invention.

In one aspect, the present embodiments provide a biometric image capturing optical structure that captures an optical image signal, converts the optical image signal into an electrical signal, and transmits the electrical signal outside the optical structure. The image acquisition optical structure for biological feature recognition

In this embodiment, the image capturing optical structure for biometric feature recognition includes a Microlens area 400 and an optical sensor 800 located below the Microlens area 400 and having a plurality of pixel point areas 810, where the area of 1 Microlens area 400 corresponds to the area of 4 pixel point areas, and the pixel point areas 400 are arranged in 2 × 2.

The optical sensor 800 is configured to capture an optical image signal irradiated thereon, convert the optical image signal into an electrical signal, and transmit the electrical signal, the photo-sensing area of the pixel area 810 is configured to capture the optical image signal irradiated thereon, and the circuit area of the pixel area 810 is configured to convert the optical image signal supplemented by the photo-sensing area into an electrical signal and transmit the electrical signal.

Further, in this embodiment, 1 Microlens area 400 is coaxial with the photoelectric sensing area of 1 pixel area directly below it.

Further, in this embodiment, the area of the Microlens area 400 is larger than the area of 1 pixel point area and smaller than the area of 4 pixel point areas.

Further, in this embodiment, in order to improve the accuracy of acquiring image information by the optical structure for acquiring a biological feature pattern and filter out invalid light, the optical structure for acquiring an image for biological feature recognition further includes an optical filling material layer 600, a veiling glare prevention diaphragm 500 and a field diaphragm 700, the optical filling material layer 600 is located between the Microlens areas 400 and the optical sensor 800, one veiling glare prevention diaphragm 500 is connected between two adjacent Microlens areas 400, one end of the veiling glare prevention diaphragm 500 extends into the lower part of one Microlens area of the two adjacent Microlens ens areas 400, the other end of the veiling glare prevention diaphragm 500 extends into the lower part of the other Microlens area, a field diaphragm 700 coaxial with each veiling glare prevention diaphragm 500 is arranged right below each veiling glare prevention diaphragm 500, the area of a light through hole of each field diaphragm 700 is smaller than that of each light through hole of each veiling glare prevention diaphragm 500, and a light channel 710 is formed between the light through hole of each veiling glare prevention diaphragm 500 and the light through hole of the field diaphragm 700 coaxial with the light through hole.

Fig. 4 shows a schematic relationship diagram of a four-in-one microlen region 400 and a pixel point region 810, and it can be seen from the diagram that the area of one 1 microlen region 400 corresponds to the area of 4 pixel point regions, where 1 microlen region 400 is coaxial with a photoelectric sensing region (in the figure, the pixel point is a signal-generated pixel point 811) of 1 pixel point region directly opposite to the lower portion of the microlen region, and the other pixel point is a signal-free pixel point 812;

fig. 5 shows the schematic diagram of the four-in-one mode, fig. 6 is the actual diagram of the four-in-one mode, and it can be seen from fig. 5 and fig. 6 that the area of 1 Microlens is greater than the area of one pixel, and the light signal in the area occupied by the Microlens is converged to 1 pixel, so that the light incident quantity of the pixel is greatly increased, the light signal intensity of the pixel is increased, and the light sensitivity of the pixel is further increased. Meanwhile, the number of pixel points generated by signals is changed from 4n in the prior art (one pixel point is corresponding to one Microlens) to n in a four-in-1 mode, the number of the pixel points generated by the signals is reduced by 3n, and when the pixel points generated by the signals are subsequently processed, the use of the structure of the invention is optimized from the original 4n data needing to be processed into only n data needing to be processed, so that the data processing amount is greatly reduced, the processing speed is greatly accelerated, and the identification sensitivity is improved.

Further, in this embodiment, the field diaphragm 700 controls the field Fov of the Microlens to be: 4 DEG < Fov < 12 deg.

Further, in this embodiment, the optical sensor 800 is preferably a CMOS sensor chip, which is a CMOS sensor chip, and the CMOS sensor chip has low power consumption, and the CMOS sensor chip converts the charge of each pixel into a voltage, amplifies the voltage before reading, and can be driven by a 3.3V power supply. And the CMOS light-sensitive chip has high integration with the peripheral circuit, so that the volume is greatly reduced.

Example 2

Fig. 7 is a schematic cross-sectional view of an image capturing optical structure for biometric identification according to the present invention.

In this embodiment, the image capturing optical structure for biometric feature recognition includes a Microlens area 400 and an optical sensor 800 located below the Microlens area 400 and having a plurality of pixel point areas 810, where the area of 1 Microlens area 400 corresponds to the area of 9 pixel point areas, and the pixel point areas 400 are arranged in 3 × 3.

Further, in this embodiment, the area of the Microlens area 400 is larger than the area of the 4 pixel areas and smaller than the area of the 9 pixel areas.

Further, in this embodiment, in order to improve the accuracy of acquiring image information by an optical structure for acquiring a biological feature pattern and filter out invalid light, the image acquisition optical structure for identifying biological features further includes an optical filling material layer 600, a veiling glare stop 500 and a field stop 700, the optical filling material layer 600 is located between the Microlens regions 400 and the optical sensor 800, one veiling glare stop 500 is connected between two adjacent Microlens regions 400, one end of the veiling glare stop 500 extends into one Microlens region of the two adjacent Microlens regions 400, the other end extends into the other Microlens region, one field stop 700 corresponds to the position right below each veiling glare stop 500, the area of the field stop 700 is larger than that of the veiling glare stop 500, and an optical channel 710 is formed between the two adjacent field stops 700.

Fig. 8 shows a schematic relationship diagram of a nine-in-one microlen region 400 and a pixel point region 810, and it can be seen from the diagram that the area of 1 microlen region 400 corresponds to the area of 9 pixel point regions, where 1 microlen region 400 is coaxial with a photoelectric sensing region (in the figure, the pixel point is a signal-generating pixel point 811) of 1 pixel point region directly facing below the 1 microlen region, and the other pixel point is a signal-free pixel point 812;

fig. 9 shows a schematic diagram of a nine-in-one mode, and as can be seen from fig. 9, in the nine-in-1 mode, the number of pixels generated by signals is changed from 9n in the prior art (one Microlens corresponds to one pixel), and the number of pixels generated by signals is reduced by 8n, when the pixels generated by signals are subsequently processed, the structure of the invention is optimized from the original 9n data to only n data, so that the data processing amount is greatly reduced, the processing rate is greatly increased, and the identification sensitivity is improved.

Example 3

Fig. 10 is a schematic perspective view of an electronic device according to an embodiment of the present invention.

In one aspect, the present embodiment provides an electronic device, where the electronic device is a smart phone, a tablet computer, and other mobile terminals or other terminal devices having a display screen.

The present embodiment is described by taking a smart phone as an example.

The electronic device of this embodiment includes a mobile phone display screen 200, a mobile phone key 210 and a mobile phone related sensor 220, wherein the mobile phone display screen 200 is provided with a biometric sensing area 299, an image capturing module for biometric identification is installed under the biometric sensing area 299, and the image capturing module for biometric identification includes the biometric-identified image capturing optical structure and the biometric-identified image capturing circuit board 1010 described in embodiment 1 or embodiment 2.

Further, the display 200 of the mobile phone is preferably an OLED display, which does not need a backlight source due to its self-emitting organic electroluminescent diode, and has the advantages of high contrast, thin thickness, wide viewing angle, fast reaction speed, wide temperature range, simple structure and process.

Fig. 11 illustrates a cross-section at the biometric sensing zone of the electronic device of fig. 10.

Further, the image acquisition optical structure for biological feature recognition further comprises an infrared filter 300, the infrared filter 300 is installed between the mobile phone display screen 200 and the Microlens area 400, and the infrared filter 300 filters infrared light with a wavelength within a cut-off waveband in the film layer structure when the light passes through the infrared filter 300 by using a thin film optical interference effect, so that the waveband cannot reach the Microlens area 400, and interference of the infrared light on the Microlens area 400 is eliminated for filtering infrared rays.

Further, in this embodiment, the image capturing circuit board 1010 for biometric identification is preferably an FPC, which is a flexible circuit board, and can be freely bent, rolled, and folded, and can be arbitrarily arranged according to the space layout requirements, and can be arbitrarily moved and extended in a three-dimensional space, so that the volume and weight of the electronic product can be greatly reduced, and the flexible circuit board also has good heat dissipation and solderability, and is easy to attach.

Further, in this embodiment, the image capturing module for biometric feature recognition further includes a reinforced steel plate 1020, and the reinforced steel plate 1020 is used for making up for the insufficient carrying capacity of the flexible circuit board.

Fig. 11-12 are schematic diagrams illustrating an image acquisition process of the optical structure in the four-in-one form for the fingerprint identification sensing area on the display screen of the OLED mobile phone.

When a finger is pressed on the mobile phone display screen 200 (the finger is not shown), the ridge of the finger is tightly attached to the screen due to the height difference of the valley ridge of the finger print, an air gap exists between the valley and the screen, the light reflection rate is different between the ridge and the screen, and the light reflection intensity is different when the light is reflected at the place. When light emitted by the OLED is reflected in a fingerprint area on the upper surface of the screen, reflected light 211 carrying fingerprint information passes through the mobile phone display screen 200, then infrared rays are filtered by the infrared filter 300, then the light passes through the anti-parasitic light diaphragm 500 after being transmitted by the Microlens, passes through the transparent optical filling material layer 600, and is converged to the light channel 710 of the field diaphragm 700, the light passes through the light channel 710 of the field diaphragm 700, and finally reaches a photoelectric sensing area of the optical sensor 800 right below the Microlens and pixel points 811 (pixel points with signal generation) coaxial with the Microlens, and light intensity information is received by the signal generation pixel points 811 of the optical sensor 800 to form a biological characteristic image. During the image acquisition process, the high-angle reflected light rays 212 existing on the upper surface of the screen beyond the field angle of Microlens are absorbed and intercepted at the anti-parasitic diaphragm 500 or absorbed and blocked by the field diaphragm 314 after passing through the anti-parasitic diaphragm 500 and the optical filling material layer 600. The pixel 812 not located right below the Microlens does not have light because it is blocked by the anti-parasitic diaphragm 500 and the field diaphragm 314, and therefore, no light intensity information is received by the optical sensor 800 to form a biometric pattern. The light with the area of 4 pixel regions is concentrated on one pixel, so that the light incoming amount of the photosensitive pixel is greatly enhanced, the signal intensity is increased, and when the image is output, the image information is output only to the pixel which senses the light and generates the signal, so that the data volume is reduced and the data transmission time is shortened under the condition of meeting the basic requirement of biological feature recognition.

In the present invention, the optical sensor 800 may adopt an existing optical sensor, and at this time, the pixel points 810 distributed on the optical sensor are divided into a pixel point 811 with signal generation and a pixel point 812 without signal generation in the image acquisition optical structure for biometric feature recognition of the present invention, and in the prior art, the distance d between two adjacent pixel points is: phi is more than or equal to 6 mu m and less than or equal to 16 mu m. When the existing optical sensor is used in the image acquisition optical structure for biological feature recognition, data transmission is only carried out on the pixel 811 with signal generation, and other pixel is subjected to silent processing. The distance d between the pixel points where the signal is generated is as follows: phi is more than or equal to 12 mu m and less than or equal to 32 mu m in the case of the four-in-one, and phi is more than or equal to 36 mu m and less than or equal to 48 mu m in the case of the nine-in-one. The standard of the existing optical sensor 800 for biometric feature recognition is 508dpi, that is, there are 508 pixels in 1 inch, that is, the pitch of each pixel is 50 micrometers, that is, in biometric feature recognition, the pitch of the pixels is smaller than 50 micrometers. The special optical sensor has the pixel point interval of 48 mu m and is less than the biological special diagnosis identification requirement of 50 mu m.

In the present invention, the optical sensor 800 may adopt a special optical sensor, the distributed pixel points on the optical sensor are only the pixel points 811 having signal generation in the image capturing optical structure for biometric feature recognition of the present invention, and other pixel points 812 having no signal generation need not be installed in the optical sensor. At this moment, the distance d between the pixel points is as follows: phi is more than or equal to 12 mu m and less than or equal to 32 mu m in the case of the four-in-one, and phi is more than or equal to 36 mu m and less than or equal to 48 mu m in the case of the nine-in-one. The standard of the existing optical sensor 800 for biometric feature recognition is 508dpi, that is, there are 508 pixels in an inch, that is, the pitch of each pixel is 50 micrometers, that is, in biometric feature recognition, the pitch of the pixels is smaller than 50 micrometers. The special optical sensor has the pixel point interval of 48 mu m and is less than the biological special diagnosis identification requirement of 50 mu m.

The image acquisition optical structure for biological feature recognition can enhance the optical signal quantity of a single pixel point (a pixel point with a signal) and reduce the data quantity of an image.

The image acquisition optical structure for biological feature recognition can prevent large-angle light rays from irradiating pixel points, eliminate stray light interference, and concentrate light rays with the area of 4 or 9 pixel point areas on one pixel point, thereby greatly enhancing the light inlet quantity of the photosensitive pixel point and increasing the signal intensity.

The image acquisition optical structure for biological characteristic identification can prevent large-angle light rays from irradiating pixel points and eliminate stray light interference, only acquires light rays in a small-angle (5-10 degrees) area of each micro lens right opposite to the screen direction, and other large-angle light rays are blocked by the micro lens array optical structure and cannot irradiate the pixel points of the photosensitive chip.

In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixed or indirectly connected through intervening media, or may be interconnected between two elements or may be in the interactive relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a biological characteristic identification's image acquisition optical structure, includes that a plurality of Microlens is regional and be located the regional optical inductor who takes a plurality of pixel of Microlens below, its characterized in that: in the plurality of the Microlens areas and the plurality of the pixel point areas, the area of 1 Microlens area corresponds to the area formed by combining more than 2 pixel point areas, and the Microlens area is coaxial with the photoelectric sensing area of the 1 pixel point area which is just opposite to the lower part of the Microlens area.

2. The biometric image capturing optical structure of claim 1, wherein: the image acquisition optical structure for biological characteristic recognition further comprises an anti-parasitic light diaphragm and a field diaphragm, wherein the anti-parasitic light diaphragm and the field diaphragm are located between the two adjacent Microlens areas and an optical sensor, one anti-parasitic light diaphragm is connected between the two adjacent Microlens areas, one end of the anti-parasitic light diaphragm extends into the lower part of one Microlens area of the two adjacent Microlens areas, the other end of the anti-parasitic light diaphragm extends into the lower part of the other Microlens area, one field diaphragm coaxial with the anti-parasitic light diaphragm is arranged under each anti-parasitic light diaphragm, the area of the light through hole of the field diaphragm is smaller than that of the anti-parasitic light diaphragm, and an optical channel is formed between the light through hole of the anti-parasitic light diaphragm and the light through hole of the field diaphragm coaxial with the anti-parasitic light diaphragm.

3. The biometric image capturing optical structure of claim 2, wherein: the biometric image capturing optical structure further includes an optical fill material layer located between the Microlens area and the optical sensor.

4. The biometric image capturing optical structure of any one of claims 2-3, wherein: the field diaphragm is located at the conjugate image surface position of the Microlens area, and the field diaphragm controls the field Fov of the Microlens to be: 4 DEG < Fov < 12 deg.

5. The biometric image capturing optical structure of any one of claims 1-4, wherein: the optical sensor is a CMOS photosensitive chip.

6. The biometric image capturing optical structure of any one of claims 1-5, wherein: the area of 1 Microlens region corresponds the area that 4 pixel regions make up, and pixel region arranges for 2 x 2.

7. The biometric image capturing optical structure of claim 6, wherein: the area of the Microlens area 400 is larger than the area of 1 pixel point area and smaller than the area formed by combining 4 pixel point areas.

8. The biometric image capturing optical structure of any one of claims 1-5, wherein: the area of 1 Microlens region corresponds to the area that 9 pixel regions make up, and pixel region arranges for 3 x 3.

9. The biometric image capturing optical structure of claim 8, wherein: the area of the Microlens area is larger than the area of the 4 pixel point areas and smaller than the area formed by the 9 pixel point areas.

10. An optical sensor of an image capturing optical structure dedicated to biometric identification according to any one of claims 1 to 9, the optical sensor having a plurality of pixels distributed thereon, wherein: the pixel points are pixel points capable of generating signals in the biological characteristic identification process, and the distance d between the pixel points capable of generating signals in the two adjacent biological characteristic identification processes is 1 time of the pixel point size < d <50 um.

11. An image acquisition method for biometric identification, the image acquisition method comprising: after light carrying biological characteristic identification passes through a Microlens, a signal is only generated by induction of one pixel point coaxially corresponding to the Microlens, and other pixel points around the pixel point and corresponding to the Microlens cannot receive optical signals and perform silent processing, so that the optical signals of a single pixel point are enhanced, and the data volume of collected images is reduced.

12. The utility model provides an electronic equipment, includes the display screen, is provided with biological identification induction zone on this display screen, installs biological characteristic identification's image acquisition module under this biological identification induction zone, and this biological characteristic identification's image acquisition module includes biological characteristic identification's image acquisition optical structure and biological characteristic identification's image acquisition circuit board, its characterized in that: the biometric image capturing optical structure of any one of claims 1-9.