CN117011897A

CN117011897A - Fingerprint detection module and living body fingerprint identification system

Info

Publication number: CN117011897A
Application number: CN202210465788.8A
Authority: CN
Inventors: 张鸿; 郭明江; 李情情
Original assignee: Beijing Heguang Technology Co ltd
Current assignee: Beijing Heguang Technology Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2023-11-07

Abstract

The invention provides a fingerprint detection module and a living body fingerprint identification system, wherein the fingerprint detection module comprises a spectrum chip, a circuit board, a transparent cover plate and a light source component, wherein the spectrum chip is arranged on the circuit board and is electrically connected with the circuit board, the transparent cover plate is supported on a photosensitive path of the spectrum chip by a support, the transparent cover plate comprises a collecting part and a non-collecting part which integrally extends outwards from the collecting part, the light source component is positioned on the side edge of the transparent cover plate, and light emitted by the light source component enters the collecting part from the non-collecting part of the transparent cover plate.

Description

Fingerprint detection module and living body fingerprint identification system

Technical Field

The invention relates to the field of fingerprint detection, in particular to a fingerprint detection module and a living body fingerprint identification system.

Background

Various types of biometric systems are increasingly used to provide greater security and/or enhanced user convenience. For example, fingerprint sensing systems have been widely used in various types of terminal devices, such as smart phones for consumers, due to their small size, high performance, and high user acceptance. At present, various fingerprint sensing systems are circulated in the market, such as a sensing system based on a capacitive fingerprint module, a sensing system based on an optical fingerprint module and the like, and the fingerprint sensing system of the type can realize unlocking, but after being applied to fingerprint identification unlocking of a mobile terminal, the fingerprint sensing system can be used for manufacturing a fake fingerprint by stealing the fingerprint of the user to crack the security system of the user, so that the probability of the fingerprint password of the mobile terminal being recognized is increased, and the information security of the mobile terminal is greatly threatened.

The existing fingerprint identification equipment mainly comprises optical fingerprint identification equipment and capacitance fingerprint identification equipment, wherein the optical fingerprint identification equipment is large in size and is not beneficial to equipment integration, and the capacitance fingerprint identification equipment is high in cost and is easily limited by chip productivity. In addition, the two fingerprint devices generally have no living body detection function, and the device safety is low. The existing living fingerprint identification schemes have certain defects, such as poor environmental stability, short service life and insufficient living detection capability of the capacitive module, and the optical module generally does not have the living detection capability, so that a simple and reliable fingerprint identification scheme is needed to realize living fingerprint identification.

With the development of spectroscopic technology, fingerprint identification devices based on multispectral technology gradually appear, but the existing multispectral fingerprint living detection devices are large in size and complex in algorithm. The prism and reflector structure is basically adopted in the light path to turn the light path to improve the image contrast, and the matched illumination light sources are more in variety and quantity, so that the system can complete identification and living body detection by multiple frames of images. In addition, as the spectrum precision is not high, the living body processing algorithm is complex, and the time consumption is long and the system load is large. The existing spectrum detection equipment has small volume but complex internal structure, and does not have high-precision living body identification performance.

The fingerprint identification device in the prior art needs to irradiate the fingerprint to be detected by the light emitted by the light source, wherein the reflected light of the fingerprint can carry detection information. The light source of the prior art fingerprint recognition device is usually disposed below the fingerprint collection lens, wherein the light emitted by the light source irradiates the surface of the fingerprint to be detected after passing through the fingerprint collection lens. In this process, reflection of part of light is inevitably generated due to the smooth surface of the fingerprint collecting lens, and the reflected light can be used as noise signal in the fingerprint identification process, so as to influence the accuracy of the identification result.

Disclosure of Invention

One of the main advantages of the present invention is to provide a fingerprint detection module and a living fingerprint identification system, wherein the living fingerprint identification system is suitable for living detection, and the applicability of the fingerprint detection device is improved.

Another advantage of the present invention is to provide a fingerprint detection module and a living fingerprint identification system, in which the fingerprint identification module collects fingerprint information of a fingerprint to be detected in a side lighting manner, which is beneficial to reducing noise signals caused by light reflection and improving fingerprint identification accuracy.

Another advantage of the present invention is to provide a fingerprint detection module and a living body fingerprint identification system, wherein the fingerprint identification module determines an identification result of the object to be identified based on a comparison result of reference spectral response data and identification spectral response data, which is beneficial to improving accuracy of fingerprint detection and identification.

Another advantage of the present invention is to provide a fingerprint detection module and a living fingerprint identification system, wherein the light source is disposed at an outer side of the transparent cover plate, and light emitted by the light source enters the transparent cover plate from the outer side of the transparent cover plate, so that the structure of the fingerprint identification module is simplified.

The fingerprint detection module and the living fingerprint identification system are provided, wherein the living fingerprint identification system based on the fingerprint identification module obtains original data, namely light intensity information, respectively carries out image information correction and spectrum information correction on the original data, then respectively adopts a fingerprint identification algorithm and a living algorithm, compares fingerprint images and spectrum information with corresponding information extracted during input, and obtains matching degree, and when the matching degree is higher than a threshold value, input verification passes, otherwise output verification fails.

Another advantage of the present invention is to provide a fingerprint detection module and a living fingerprint identification system, wherein the fingerprint identification module further includes a light shielding layer, wherein the light shielding layer is disposed on a lower surface of the transparent cover plate, so as to facilitate reducing light emitted by the light source from directly emitting out through the lower surface of the transparent cover plate, thereby facilitating improving light intensity of detection light.

Another advantage of the present invention is to provide a fingerprint detection module and a living body fingerprint identification system, wherein the fingerprint identification module further includes a light-gathering layer, wherein the light-gathering layer is disposed on an upper surface of the transparent cover plate, so as to increase energy of incident light reaching a region to be detected of the transparent cover plate, and at the same time, utilize total reflection caused by a refractive index of the light-gathering layer being greater than a refractive index of the transparent cover plate to filter some incident light with a larger angle. .

According to an aspect of the present invention, there is provided a fingerprint detection module, including:

a spectrum chip;

a circuit board, wherein the spectrum chip is arranged on the circuit board and is electrically connected with the circuit board;

a bracket;

the transparent cover plate is supported on the photosensitive path of the spectrum chip by the bracket and comprises a collecting part and a non-collecting part which integrally extends outwards from the collecting part; and

the light source assembly is positioned on the side edge of the transparent cover plate, and light emitted by the light source assembly is incident to the collecting part from the non-collecting part of the transparent cover plate.

According to one embodiment of the present invention, the transparent cover plate further has an upper surface and a lower surface, wherein the upper surface is opposite to the lower surface, the light source assembly is disposed outside the non-collecting portion of the transparent cover plate, emits light toward the transparent cover plate, and forms at least one incident light path between the upper surface and the lower surface of the transparent cover plate.

According to one embodiment of the invention, the light source assembly comprises at least one light source and at least one light homogenizing member, and the light homogenizing member is positioned between the light source and the transparent cover plate.

According to one embodiment of the present invention, the light homogenizing member is integrally formed on the outer side of the non-collecting portion of the transparent cover plate.

According to an embodiment of the present invention, the light source and the light homogenizing member surround the transparent cover plate, and the light emitted by the light source may be understood as vertically entering the light homogenizing member, and then being incident to the transparent cover plate along a horizontal direction through the light homogenizing member.

According to one embodiment of the invention, further comprising an optical assembly disposed in a photosensitive path of the spectral chip, wherein the optical assembly is supported by the bracket between the transparent cover plate and the spectral chip.

According to an embodiment of the present invention, the stand includes a stand body and an extension unit integrally extending inward from the stand body, wherein the light source assembly and the transparent cover plate are supported at an upper end of the stand body, and the optical assembly is fixedly supported by the extension unit.

According to one embodiment of the present invention, the holder includes a first holder and a second holder, wherein the first holder is located outside the second holder, the transparent cover plate and the light source assembly are supported at an upper end of the first holder, and the optical assembly is fixed and supported by the second holder.

According to one embodiment of the invention, the transparent cover plate further comprises a light shielding layer, wherein the light shielding layer is provided to the lower surface of the transparent cover plate.

According to one embodiment of the invention, the light shielding layer is selected from a combination of materials consisting of a reflective film and an absorbing film.

According to one embodiment of the present invention, further comprising a light condensing layer, wherein the light condensing layer is disposed at the upper surface of the transparent cover plate, and a refractive index of the light condensing layer is greater than a refractive index of the transparent cover plate.

According to one embodiment of the invention, the spectral chip has a modulated area 101 and a non-modulated area, the modulated area being centrally arranged in four corners or in a peripheral area of the spectral chip, the non-modulated area being located in a central area of the spectral chip.

According to one embodiment of the invention, the optical component of the fingerprint detection module is a microstructure array, the spectrum chip comprises a light filtering structure and an image sensor, wherein the microstructure array and the light filtering structure are positioned on a photosensitive path of the image sensor, and the microstructure array, the light filtering structure and the image sensor are sequentially stacked and integrated into a whole.

According to one embodiment of the invention, the energy of the incident light emitted by the light source assembly in the 400-600nm wave band is 80% or more.

According to another aspect of the present invention, there is further provided a living body fingerprint recognition system including:

a control unit;

the fingerprint detection module according to any one of the above; and

and the processing unit and the fingerprint detection module are electrically connected to the control unit, the fingerprint detection module acquires the identification spectral response data of the object to be identified, and the identification result of the object to be identified is determined based on the comparison result of the set reference spectral response data and the identification spectral response data.

Drawings

Fig. 1 is a schematic diagram of a living body fingerprint recognition system according to the present invention.

Fig. 2 is a schematic diagram of a frame of the living body fingerprint recognition system according to the present invention.

Fig. 3 is a schematic diagram of a white LED luminescence spectrum of the living body fingerprint recognition system according to the present invention.

Fig. 4 is a system frame diagram of the living body fingerprint recognition system according to the present invention.

Fig. 6 is a schematic diagram of a spectrum chip structure of a fingerprint detection module according to the present invention.

Fig. 5 is a schematic diagram of a frame of the fingerprint detection module according to the present invention.

Fig. 7 is a schematic view of the microstructure of a sensor of the fingerprint detection module according to the present invention.

Fig. 8 is a schematic diagram of a spectral pixel structure of the sensor of the fingerprint detection module according to the present invention.

Fig. 9 is a schematic structural diagram of a spectrum chip of the sensor of the fingerprint detection module according to the present invention.

Fig. 10 is a schematic view of the microstructure of the spectrum chip of the sensor of the fingerprint detection module according to the present invention.

Fig. 11 is a schematic diagram of a physical pixel of a spectrum chip of the sensor of the fingerprint detection module according to the present invention.

Fig. 12 is a schematic view of the microstructure of the spectrum chip of the sensor of the fingerprint detection module according to the present invention.

Fig. 13 is a schematic view of the microstructure of the spectrum chip of the sensor of the fingerprint detection module according to the present invention, which shows the modulation region structure of the spectrum chip.

Fig. 14 is a schematic view of the microstructure of the physical pixels of the spectrum chip of the sensor of the fingerprint detection module according to the present invention.

Fig. 15 is a schematic structural diagram of a fingerprint detection module according to a first preferred embodiment of the present invention.

Fig. 16 is a schematic diagram of another alternative implementation of the fingerprint detection module according to the first preferred embodiment of the present application.

Fig. 17A and 17B are schematic diagrams of an optical path of the fingerprint detection module according to another preferred embodiment of the present application.

Fig. 18 is a schematic diagram of another alternative implementation of the fingerprint recognition module according to another preferred embodiment of the present application.

Fig. 19A and 19B are schematic diagrams showing simulation results of the fingerprint recognition module according to the preferred embodiment of the application, wherein the fingerprint recognition module is provided with a light condensing layer for total impact times.

Detailed Description

The technical scheme of the embodiment of the application will be described below with reference to the accompanying drawings. It is apparent that the described embodiments relate only to some, but not all, embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the disclosed embodiments, are within the scope of the present application. The terms "comprising" and "having" and any variations thereof, in the description and claims of the present application, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It will be understood by those within the art that certain terms, such as those used in the specification and claims, may be used in any orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are merely for convenience of description and to simplify the description, rather than to indicate or imply that the devices, mechanisms, structures or elements being referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore the above terms should not be construed as limiting the application. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one implementation of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Overview of fingerprint detection Module

The living fingerprint identification system of the application belongs to optical fingerprint identification, adopts a direct shooting mode, and an imaging unit of the living fingerprint identification system directly images a finger placed on a transparent cover plate, thereby greatly reducing the volume of a module. In addition, the imaging can acquire spectral information generated by reflection of an object to be detected, and accurate living body detection is carried out, so that the safety level of the system is greatly improved. The living fingerprint identification of the present application also covers the identification of living palmprints and any living skin.

As shown in fig. 1, due to physiological characteristics such as capillaries (blood) and sweat pores in human skin, the human skin is difficult to forge as compared with fingerprint lines, and due to the physiological characteristics, the skin has different spectral absorption/reflection degrees of different wave bands, which means that living body judgment can be performed according to spectral information reflected by the skin, so that living body detection of fingerprints is realized. Specifically, as shown by the reflection spectrum test on the real finger and the finger model material, the difference between the reflection spectrum of the real finger and the reflection spectrum of the finger model material is huge at the wavelength of 300nm-1100nm, and as shown in fig. 1, the difference between the reflection spectrum data corresponding to the real finger and the reflection spectrum data corresponding to the finger model material is large by taking the test of silica gel, paper, human skin and the like as an example. Therefore, it is possible to make a living body judgment by the received reflection spectrum.

The living body fingerprint recognition system of the present invention is shown in fig. 2 and 3, wherein the living body fingerprint recognition system includes a control unit 100, an imaging unit 200, an illumination unit 300, and a processing unit 400, wherein the control unit 100 is electrically connected to the imaging unit 200, the illumination unit 300, and the processing unit 400, and the imaging unit 200, the illumination unit 300, and the processing unit 400 are controlled to operate by the control unit 100. The illumination unit 300 emits an incident light, the incident light irradiates an object to be measured (such as a finger, a palm, etc.) and is reflected to form a reflected light with detection information, the reflected light is received by the imaging unit 200, corresponding light intensity information is obtained, and the light intensity information is processed by the processing unit 400, so that texture and/or living body information of the object to be measured are identified.

Preferably, the incident light emitted through the illumination unit 300 is uniform light. Thus, in the present application, the lighting unit 300 includes a light source and a light homogenizing member, which may be a light homogenizing member, for homogenizing incident light projected from the light source. The imaging unit 200 includes an imaging device and a spectrum chip, the imaging device being located on a photosensitive path of the spectrum chip, wherein the imaging device may further include a lens group, a filter, and the like. The processing unit 400 may provide a texture image restoration algorithm, and/or a living body recognition algorithm in the present application. The illumination unit 300 is disposed around the imaging unit, and the light source and the spectrum chip are electrically connected and fixed to the same circuit board; the light source and the spectrum chip can also be separately arranged on different circuit boards, for example, the circuit boards for arranging the light source can be independently arranged on a bracket. Preferably, the light sources are symmetrically distributed about the imaging unit, may be distributed along a circular ring, a square ring, or left-right multi-point symmetry, i.e. the identification system may have one or more light sources in the present application.

The light source is an LED, wherein the light source is a white light LED, or a monochromatic LED with specific wavelength or a plurality of light combinations, such as an optical combination of red, green and blue plus NIR. In living body identification, the main principle is that the physiological characteristics cause the spectrum absorption/reflection degree of the skin to be different in different wave bands. Experiments have shown that skin is relatively sensitive to spectral absorption/reflection at 400-600nm, especially 500-600nm. Therefore, the light source of the present application preferably emits incident light having a strong intensity in the 400-600nm range, while the light intensities in the other bands are relatively weak. More preferably 500-600nm has a strong light intensity. For example, the source spectrum relative intensity distribution satisfies: the energy is mainly distributed between 500nm and 600nm, the distribution in the interval is relatively flat, and no obvious peak exists; 400 nm-500 nm has a small amount of energy distribution, the energy integral of which is not higher than 80% of the interval of 500-600nm, and no significant peak exists; the light intensity is as weak as possible in the spectral range outside 400-600nm, and the energy sum in this interval is not higher than 20% of the total radiation energy sum of the light source.

As shown in fig. 4, a fingerprint recognition method of the recognition system according to the present application is illustrated according to another aspect of the present application. The fingerprint texture and the living body identification or detection flow can be processed in parallel or in series according to the system performance and actual needs, and the living body detection function can be independently switched on and off. Specifically, the finger to be measured is placed in the region to be measured, the illumination unit 300 emits an incident light to the finger to be measured, a part of the incident light is absorbed by the finger to be measured, and a part of the incident light is reflected to form a reflected light, the reflected light is collected by the imaging unit 200 to obtain corresponding light intensity information, the light intensity information comprises image information and spectrum information, the image information is used for fingerprint image identification, and the spectrum information is used for spectrum data analysis to perform living body judgment; matching the fingerprint image with a pre-stored reference fingerprint image, and judging a living body by utilizing spectrum information in parallel or in series; if both pass, the verification is successful; otherwise the system will alarm.

Referring to fig. 5 to 14 of the drawings of the present specification, the illumination unit 300 and the imaging unit 200 of the fingerprint recognition system according to another aspect of the present application are integrated with a fingerprint detection module, which will be elucidated in the following description. The fingerprint detection module comprises a spectrum chip 10 and a circuit board 20, wherein the spectrum chip 10 is electrically connected to the circuit board 20 and is used for receiving detection light reflected by a living fingerprint to be detected and provided with fingerprint detection information, and light intensity information is obtained. Specifically, the spectrum chip 10 includes a filter structure 11 and an image sensor 12, the filter structure 11 is located on a photosensitive path of the image sensor 12, and the filter structure 11 is a broadband filter structure in a frequency domain or a wavelength domain. The passband spectra of the different wavelengths of the filter structure 11 are not exactly the same throughout. The filter structure 11 may be a structure or a material having a filter property such as a super surface, a photonic crystal, a nano-pillar, a multilayer film, a dye, a quantum dot, a MEMS (micro electro mechanical system), an FP etalon, a cavity layer, a waveguide layer, a diffraction element, or the like. For example, in the embodiment of the present application, the optical filtering structure 11 may be a light modulation layer in chinese patent CN 201921223201.2. The image sensor 12 may be a CMOS Image Sensor (CIS), CCD, array photodetector, or the like. The spectroscopic device further includes a data processing unit, which may be a processing unit such as MCU, CPU, GPU, FPGA, NPU, ASIC, that can export data generated by the image sensor 12 to the outside for processing.

The spectrum chip 10 is used for acquiring finger line image information and finger spectrum characteristic information to realize verification of finger biological characteristics, wherein the chip size range is between 1/9 'and 1/1.6', the imaging spatial resolution is above 5 ten thousand pixels, and the spectrum chip has the spectrum discrimination capability of the light to be detected, which is equivalent to the spectrum resolution below 30 nm. The spectrum chip 10 may be attached to the circuit board 20 by COB or CSP packaging, FC packaging technology.

It should be noted that, in the present application, the spectrum chip 10 records the intensity signal of the incident light at different wavelengths λ as f (λ), the transmission spectrum curve of the filtering structure as T (λ), and the spectrum chip 10 has m groups of filtering structures, each group of transmission spectrums being different from each other, which are also called "structural units", and may be collectively referred to as Ti (λ) (i=1, 2,3, …, m). And corresponding physical pixels are arranged below each group of filter structures, and the light intensity information Ii modulated by the filter structures is detected. In the present application, a group of structural units corresponding to one physical pixel is described as an example, but the present application is not limited thereto, and in other embodiments, a plurality of physical pixels may be grouped to correspond to a group of structural units.

The relationship between the spectral distribution of the incident light and the measured value of the image sensor can be expressed by the following equation:

Ii＝Σ(f(λ)·Ti(λ)·R(λ))

Where R (λ) is the response of the image sensor, noted as:

Si(λ)＝Ti(λ)·R(λ)

the above equation can be extended to a matrix form:

where Ii (i=1, 2,3, …, m) is the response of the image sensor after the light to be measured passes through the broadband filter structure, and corresponds to the light intensity information of the m image sensors, which is also called m "physical pixels", and is a vector with a length of m. S is the optical response of the system for different wavelengths, and is determined by two factors, namely the transmissivity of the filtering structure and the quantum efficiency of the response of the image sensor. S is a matrix, each row vector corresponds to the response of a structural unit to incident light with different wavelengths, wherein the incident light is discretely and uniformly sampled, and n sampling points are all used. The number of columns of S is the same as the number of samples of the incident light. Here, f (λ) is the intensity of the incident light at different wavelengths λ, i.e. the spectrum of the incident light to be measured.

In practical applications, the response parameter S of the system is known, and the spectrum f (can be understood as spectrum recovery) of the input light can be obtained by using algorithm to back-calculate through the light intensity reading I of the image sensor, and the process can adopt different data processing modes according to the situation, including but not limited to: least squares, pseudo-inverses, equalizations, least squares, artificial neural networks, etc.

Taking one physical pixel corresponding to one group of structural units as an example, how to recover one spectrum information, which is also called as a "spectrum pixel", by using m groups of physical pixels (i.e., pixel points on an image sensor) and m groups of corresponding structural units (the same structure on a modulation layer is defined as a structural unit) are described above. It should be noted that, in the embodiment of the present application, a plurality of physical pixels may correspond to a set of structural units. It may be further defined that a group of structural elements and corresponding at least one physical pixel constitute a unit pixel, in principle at least one unit pixel constitutes one of said spectral pixels.

On the basis of the implementation mode, the spectral pixels are subjected to array processing, so that the snapshot type spectral imaging device can be realized.

As shown in fig. 7, with an image sensor of 1896×1200 pixels (fig. 7 shows a partial area of the image sensor), and m=4 is selected, i.e. 4*4 unit pixels are selected to form one spectrum pixel, 474×300 spectrum pixels independent from each other can be implemented, where each spectrum pixel can separately calculate the spectrum result by the above method. After the image sensor is matched with components such as a lens group, the object to be detected can be subjected to snapshot spectrum imaging, so that spectrum information of each point of the object to be detected can be obtained through single exposure.

On the basis, the selection mode of the optical pixels can be rearranged according to actual needs under the condition that the image sensor does not need to be adjusted, so that the spatial resolution is improved. As shown in fig. 9, the close-packed arrangement of the solid line boxes and the dashed line boxes may be selected to increase the spatial resolution from 474×300 to approximately 1896×1200 in the above example.

Further, the spatial resolution and the spectral resolution can be rearranged as required for the same image sensor. For example, in the above example, when the spectral resolution requirement is high, 8×8 unit pixels may be used to form one spectral pixel; when the spatial resolution requirement is high, 3*3 physical pixels can be used to form one spectral pixel. That is, the spectrum chip 10 may acquire light intensity information, which may be used for imaging or for spectrum recovery. For example, in a living body fingerprint identification system, the light intensity information may include image information for fingerprint line image restoration and spectrum information for judging a living body.

In the present invention, the spectrum chip 10 has a modulation area 101 and a non-modulation area 102, wherein the modulation area 101 is provided with a filtering structure on the optical path of the image sensor 12, and the non-modulation area 102 is not provided with a filtering structure correspondingly, that is, the incident light is modulated by the filtering structure in the modulation area and then received by the image sensor 12. Whereas the non-modulated regions 102 are not modulated, for example, when the image sensor is a CMOS chip, the non-modulated regions 102 are implemented directly as black and white pixels (i.e., no bayer array is provided on the CMOS chip). Preferably, the modulation region 101 may acquire spectral information, and the non-modulation region 102 acquires image information. In various embodiments, the non-modulated regions 102 may also be implemented as bayer arrays, microlens arrays, convex lenses, concave lenses, fresnel lenses, etc. to modulate the incident light.

In the present invention, the area of the modulation region 101 occupies 10% -50%, preferably 12% -25% of the area of the effective area of the spectrum chip 10. Optionally, at least a portion of the modulated regions 101 and the non-modulated regions 102 are spaced apart. Therefore, in the process of processing and analyzing, the image information of the non-modulation region 102 around the modulation region 101 can be used to combine with the spectrum information of the modulation region 101, and the spectrum information can be optimized by using the image information, for example, the image information can be used to remove noise and the like, so that the spectrum information is more accurate. Specifically, the image information of the peripheral non-modulated regions 102 may be averaged, and the value of the modulated regions 101 may be divided by or subtracted from the average value of the image information of the peripheral non-modulated regions 102 of the modulated regions 101; spectral information may also be used to assist in image recovery from image information. Thus, the spectrum information has more information, and because the modulation region 101 is provided with a structural unit, which is different from the information of the non-modulation region 102, the region has information gaps during imaging, so that the spectrum information acquired by the modulation region 101 can be used for calculating to compensate the image information of the region or correcting the image information of the adjacent region. For example, as shown in the figure, the filtering structure 11 corresponds to one physical pixel, and two adjacent filtering structures are separated by two physical pixels; i.e. 1 physical pixel with a structural unit is surrounded by 8 physical pixels.

In another embodiment of the present application, as shown in fig. 12, the modulation region 101 of the spectrum chip 10 may be set according to the requirement. For example, it may be located at the four corners and/or the periphery of the spectral chip 10; preferably, in a specific example of the present application, the modulation region 101 and the non-modulation region 102 may be designed according to an application scenario of the spectrum chip 10. Taking fingerprint recognition as an example, the modulation region 101 is used to obtain spectrum information as a main component, and the spectrum information is used to determine whether the subject is living or not, and the non-modulation region 102 is used to obtain an image. Therefore, the modulation regions 101 are intensively disposed in the characteristic regions of the spectrum chip 10, for example, four corners and peripheral lens resolution are poor, so that the modulation regions 101 of the spectrum chip 10 may be disposed in the four corners or peripheral regions of the spectrum chip 10 only to acquire spectrum information. Accordingly, the non-modulated region 102 is located in the central region of the spectral chip 10. Since the fingerprint texture is compared with the feature points of the fingerprint to be captured, the feature points of the fingerprint are generally concentrated in the central part of the finger. Therefore, the central area of the spectrum chip 10 is set as the non-modulation area 102, so that the imaging quality can be improved, and the precision of the obtained fingerprint texture can be improved, so that the fingerprint comparison precision is higher. Meanwhile, compared to the arrangement of the modulating region 101 and the non-modulating region 102 at intervals in the previous embodiment, the imaging quality can be improved when the middle region of the spectrum chip 10 in this embodiment is set as the non-modulating region 102. It should be noted that, the central area is not strictly limited to the central area of the spectrum center, and may be a regular area near the center of the active area of the spectrum chip or an irregular area near the center of the active area of the spectrum chip.

Further, it will be appreciated that the modulated regions 101 are regions provided with the filter structures 11 as described above, whereas the non-modulated regions 102 are implemented as regions of conventional pixels, i.e. without the filter structures mentioned in the present invention. In order to better process the spectrum signal of the modulation area 101, optionally, a black-and-white pixel with a calibration function is arranged in the modulation area 101 or adjacent to the modulation area, and after the light intensity information is obtained through the black-and-white pixel with the calibration function, the spectrum information obtained by the modulation area is calibrated. It should be noted that, in the preferred embodiment of the present invention, the black pixel is a pixel unit having a filter structure, and the white pixel is a pixel unit not having a filter structure.

It should be noted that, in the present invention, the modulation region 101 and the non-modulation region 102 of the spectrum chip 10 are regions actually involved in acquiring light intensity information, and are not completely limited to the regions of the image sensor and/or the filter structure. Thus, in other embodiments, as shown in fig. 13, the modulation region 101 may be concentrated in the central region of the spectrum chip 10, and the non-modulation region 102 is located around and/or at four corners; so that the modulation region 101 can receive more intense, more accurate spectral information.

In the present application, since the modulated regions 101 may lack image information for calculation, the image information values of the modulated regions 101 may also be calculated using the image information values obtained by the physical pixels of the surrounding non-modulated regions 102. Specifically, an average value of the image information of the peripheral physical pixels may be used as the image information value of the modulation region 101, so that the whole image is more complete, as in the spectrum chip of fig. 11, that is, 8 physical pixels surround physical pixels corresponding to 1 structural unit, for example, the image information value of the middle modulation region may be calculated by using the peripheral 8 physical pixels; the average value of 24 peripheral physical pixels can be used to calculate the image information value corresponding to the intermediate modulation region.

The circuit board 20 may be a Flexible Printed Circuit (FPC), a rigid Printed Circuit (PCB) or a rigid-flex board (F-PCB), a ceramic substrate, etc. The circuit board 20 is used for driving, controlling, data processing and outputting the light source and the sensor chip.

The fingerprint detection module further comprises an optical component 60, wherein the optical component 60 is located on the optical path of the spectrum chip 10. Preferably, in the present application, the optical component 60 is a lens group, i.e. the optical component 60 is composed of at least one lens. More preferably, the lens group is used for imaging the finger to be detected in the region to be detected on the spectrum chip 10, the FOV is between 80 degrees and 130 degrees, the back focal length is between 0.3mm and 5mm, and the total optical length is between 1mm and 10 mm. The optical assembly 60 further includes a filter element for filtering the reflected light, for example, the filter element cuts off the band of 650nm or 600nm or more, that is, only allows the reflected light of 650nm or 600nm or less to pass through, so as to prevent the interference of the external environment light on the test result. It will be appreciated that the filter element may be adjusted or selected according to actual requirements.

The fingerprint detection module further comprises a bracket 30, the bracket 30 is disposed on the circuit board 20, the optical component 60 is disposed on the bracket 30, and the optical component 60 is supported by the bracket 30 and maintains the optical path of the spectrum chip 10.

The fingerprint detection module further comprises a transparent cover plate 40, wherein the region to be detected is formed on the surface of the transparent cover plate 40 for placing a finger to be detected or a palm to be detected, and the transparent cover plate 40 can be, but is not limited to, optical glass (glass cover plate) or optical plastic, and has a thickness of 0.8mm-1.2mm. The fingerprint detection module further comprises at least one light source assembly 50, wherein the light source assembly 50 is used for illuminating a finger to be detected or a palm to be detected. Preferably, the light emitted by the light source assembly 50 has a spectral width (. Gtoreq.30 nm). Preferably, in the present application, the light source assembly 50 may emit monochromatic light and/or mixed light according to the need. Preferably, the light source assembly 50 includes a light source 51 and a light homogenizing member 52, and the incident light emitted from the light source 51 is homogenized by the light homogenizing member 52 and then is incident to the finger or palm to be measured through the transparent cover 40.

The light homogenizing member 52 is located between the light source 51 and the transparent cover 40. The light homogenizing member 52 is made of transparent optical plastic, the surface of the light homogenizing member can be frosted, and a certain proportion of light scattering powder can be filled in the light homogenizing member. It should be noted that, in the fingerprint identification apparatus of the prior art, the light source is located below the fingerprint collection panel, such as transparent glass, where the light emitted by the light source reaches the surface of the fingerprint to be measured through the collection panel, and the light to be measured formed by the reflection of the fingerprint to be measured reaches the spectrum chip 10 through the optical component 60 after passing through the fingerprint collection panel. It should be noted that, in the prior art, some light emitted by the light source of the fingerprint recognition device is reflected by the lower surface of the fingerprint collection panel, and directly reaches the spectrum chip 10 through the optical component 60, and the light reflected by the fingerprint collection panel may affect the detection result of the fingerprint recognition device as an interference signal.

Example 1

As shown in fig. 15, the fingerprint detection module according to the first preferred embodiment of the present invention is illustrated in the following description. The fingerprint detection module comprises a spectrum chip 10, a circuit board 20, a bracket 30, a transparent cover plate 40 and at least one light source assembly 50, wherein the spectrum chip 10 is arranged on the circuit board 20 and is electrically connected with the circuit board 20, the transparent cover plate 40 is arranged on the bracket 30, and the transparent cover plate 40 is supported by the bracket 30 on a photosensitive path of the spectrum chip 40. The light source assembly 50 is disposed at the outer side of the transparent cover 40, and the light generated by the light source assembly 50 is incident from the side of the transparent cover 40 and forms reflected light with fingerprint information to be measured through the transparent cover 40.

In detail, the transparent cover 40 may be, but is not limited to, transparent glass, wherein the transparent cover 40 includes a collecting portion 41 and a non-collecting portion 42 integrally extending outward from the collecting portion 41, wherein the non-collecting portion 42 is disposed along an outer edge of the collecting portion 41. The light source assembly 50 is disposed on the non-collecting portion 42 of the transparent cover 40, or the light source assembly 50 is disposed outside the non-collecting portion 42, wherein the light generated by the light source assembly 50 is incident from the non-collecting portion 42 of the transparent cover 40 to the collecting portion 41 of the transparent cover 40. The collecting portion 41 of the transparent cover 40 is used for collecting fingerprints of a person to be measured, that is, an area for collecting fingerprints of the person to be measured is provided, and the person to be measured places fingers or palms on the collecting portion 41 of the transparent cover 40. The light generated by the light source assembly 50 reaches the collecting portion 41 from the non-collecting portion 42, and forms a reflection on the upper surface of the collecting portion 41, wherein the reflected light with the fingerprint information to be measured is reflected from the collecting portion 41 of the transparent cover 40 to the spectrum chip 10, so that the spectrum chip 10 can determine the fingerprint information of the living body based on the reflected light of the fingerprint information to be measured. It should be understood that, in the present invention, the non-collecting portion 42 and the collecting portion 41 form the transparent cover 41, the non-collecting portion 42 and the collecting portion 41 are divided according to practical applications, and in further embodiments, the non-collecting portion 42 may be identical to the collecting portion 41, that is, the partial area (non-collecting portion) may also be used to collect the fingerprint of the person to be measured.

The transparent cover 40 further has an upper surface 401 and a lower surface 402, where the upper surface 401 is opposite to the lower surface 402, the upper surface 401 of the transparent cover 40 faces outward for placing a finger or palm to be measured, and the light incident on the transparent cover 40 by the light source assembly 50 forms reflection on the upper surface 401 of the transparent cover 40, that is, a part of the incident light is absorbed by the finger or palm to be measured, and a part of the incident light generates reflection light with fingerprint information to be measured, and the reflection light with fingerprint information to be measured reaches the spectrum chip 10 through the lower surface 402.

It should be noted that, as shown in fig. 17A to 18, in the preferred embodiment of the present invention, the light source assembly 50 emits light from the outside of the transparent cover 40 toward the transparent cover 40, and forms at least one incident light path 410 between the upper surface 401 and the lower surface 402 of the transparent cover 40, wherein the light emitted from the light source assembly 50 enters the collecting portion 41 of the transparent cover 40 from the non-collecting portion 42 of the transparent cover 40 along the incident light path 410. Preferably, in the preferred embodiment of the present invention, the light source assembly 50 emits light to form the incident light path 410 in a horizontal direction.

The light emitted by the light source assembly 50 reaches the upper surface 401 of the transparent cover 40 along the incident light path 410, and is reflected by the object to be detected to form a reflected light path 420, wherein the reflected light with the fingerprint information to be detected enters the spectrum chip 10 along the reflected light path 420 through the lower surface 402 of the transparent cover 40.

It can be understood that, in the preferred embodiment of the present application, the light source assembly 50 of the fingerprint recognition module is located at the outer side of the transparent cover 40, and the light generated by the light source assembly 50 enters the transparent cover 40 in a side incident manner, and forms the reflected light with the fingerprint information to be detected at the collecting portion 41 of the transparent cover 40. Briefly, in the preferred embodiment of the present application, the fingerprint recognition module is side illuminated, i.e. the light source assembly 50 irradiates light from the side of the transparent cover 40.

Preferably, in the preferred embodiment of the present application, the incident light path 410 generated by the light source assembly 50 is not lower than the lower surface 402 of the transparent cover 40, that is, the light generated by the light source assembly 50 enters the collecting portion 41 from the non-collecting portion 42 along the incident light path 410 above the lower surface 402 of the transparent cover 40 and forms reflection on the upper surface 401 of the collecting portion 41. It will be appreciated that the light source 50 forms the reflected light path 420 above the lower surface 402 of the transparent cover 40, so that the influence of stray light formed by specular reflection of the light source 50 at the lower surface 402 of the transparent cover 40 on the detection result can be avoided.

As shown in fig. 15, the light source assembly 50 includes at least one light source 51 and at least one light homogenizing member 52, wherein the light homogenizing member 52 is located at a front end of the light source 51 in a light emitting direction, and light generated by the light source 51 reaches the transparent cover 40 through the light homogenizing member 52. The light source 51 of the light source assembly 50 is outside the transparent cover 40, wherein the light homogenizing member 52 is located between the light source 51 and the transparent cover 40.

Preferably, in one embodiment of the present invention, the light homogenizing member 52 of the light source assembly 50 and the transparent cover 40 are integrally formed, that is, the light homogenizing member is formed on a side surface of the transparent cover, and the light source 51 is attached to the light homogenizing member 52, so that the light emitted by the light source 51 can enter the light homogenizing member 52 as completely as possible, be homogenized, and be projected to the area to be measured of the transparent cover 40. I.e. the non-collecting section 42 is implemented as a light homogenizing member 52. As an example, the side surface of the transparent cover 40 may be frosted, so that the side surface of the transparent cover 40 has a light homogenizing effect, that is, the side surface of the transparent cover 40 is frosted to form a light homogenizing layer of the light source assembly 50, so as to homogenize the light of the light source 51. So that the light homogenizing member can be replaced, namely the light homogenizing layer is the light homogenizing member in the embodiment; or the light is homogenized together with the light homogenizing piece, so that the light homogenizing effect is better.

Preferably, the light source 51 and the light homogenizing member 52 surround the transparent cover 40, and the light emitted by the light source 51 may be understood as entering the light homogenizing member 52 substantially perpendicular to the optical axis, and then being homogenized by the light homogenizing member 52 and then being incident on the transparent cover 40 in the horizontal direction. It is understood that the incident light enters the light homogenizing member substantially perpendicularly regardless of the scattering angle of the light.

As shown in fig. 15, the fingerprint recognition module further includes an optical component 60, wherein the optical component 60 is disposed on the photosensitive path of the spectrum chip 10, and wherein the optical component 60 is supported between the transparent cover 40 and the spectrum chip 10 by the bracket 30. The bracket 30 is fixed on the circuit board 20, and the bracket 30 is provided with a light hole 302, wherein the light hole 302 of the bracket 30 is located on the photosensitive path of the spectrum chip 10, and the spectrum chip 10 can obtain the light to be detected through the light hole 302 of the bracket 30.

The optical assembly 60 is implemented as a lens group, wherein the optical assembly 60 includes at least one optical lens. The optical lens of the optical component 60 is fixed above the spectrum chip 10 by the bracket 30, and the light to be detected is processed by the optical component 60.

Accordingly, the holder 30 includes a holder body 31 and an extension unit 32 integrally extended inward from the holder body 31, wherein the light-transmitting hole 302 is formed at an upper end of the holder body 31 of the holder 30, the extension unit 32 extends inward from the holder body 31 and forms a supporting structure having a light-transmitting hole 302 in the middle, wherein the optical component 60 is disposed at the light-transmitting hole 302 formed by the extension unit 32, and the optical component 60 is supported by the extension unit 32 on the light-sensing path of the spectrum chip 10.

The transparent cover 40 and the light source assembly 50 are provided to the holder body 31 of the holder 30, and the transparent cover 40 and the light source assembly 50 are fixed and supported by the holder body 31. The transparent cover 40 may be, but is not limited to, a transparent glass or transparent plastic structure. The transparent cover 40 is covered on the photosensitive path of the spectrum chip 10, and the transparent cover 40 provides a region to be measured suitable for fingerprint collection. Preferably, in the preferred embodiment of the present invention, the light source assembly 50 is disposed at an end of the holder body 31 of the holder 30, wherein a light emitting surface of the light source assembly 50 faces the transparent cover 40.

It should be noted that the light source assembly 50 in the preferred embodiment of the present application is the illumination unit 300 in the living body fingerprint recognition system.

Example two

As shown in fig. 16, the fingerprint detection module according to the second preferred embodiment of the present application is illustrated in the following description. The fingerprint detection module comprises a spectrum chip 10, a circuit board 20, a bracket 30A, an optical component 60, a transparent cover plate 40 and a light source component 50, wherein the spectrum chip 10 is electrically connected with the circuit board 20, the optical component 60 is arranged on the bracket 30A, and the optical component 60 is kept in a photosensitive path of the spectrum chip 10 through the bracket 30A. The light source assembly 50 and the transparent cover 40 are disposed at the top end of the bracket 30A, and the light source assembly 50 is located at the outer side of the transparent cover 40, and light generated by the light source assembly 50 enters the transparent cover 40 from the outer side of the transparent cover 40. It should be noted that, in the preferred embodiment of the present application, the structures of the transparent cover 40 and the light source assembly 40 are the same as those of the first preferred embodiment, and are not described herein.

Unlike the above preferred embodiment, the support 30A includes a first support 33A and a second support 34A, wherein the first support 33A is located outside the second support 34A, the transparent cover 40 is fixed to the first support 33A, the optical component 60 is disposed on the second support 34A, and the optical component 60 is supported on the photosensitive path of the spectrum chip 10 through the second support 34A.

The second bracket 34A is provided with a first light hole 340A, wherein the optical component 60 is fixed to the first light hole 340A of the second bracket 34A by the second bracket 34A. It can be appreciated that the first light holes 340A of the second bracket 34A are opposite to the light sensing surface of the spectrum chip 10. The first bracket 33A is supported on the outer side of the second bracket 34A, the optical assembly 60 is fixedly supported by the second bracket 34A, and the second bracket 34A forms a sealed environment with the optical assembly 60 and the wiring board 20. The spectrum chip 10 is placed in a sealed space formed by the second holder 34A, the optical component 60 and the circuit board 20.

Example III

As shown in fig. 17A to 18, according to another aspect of the present application, the present application further provides another preferred embodiment of the fingerprint recognition module. The working principle of the application is that a finger or palm to be measured is placed on the collecting part 41 of the transparent cover plate 40, i.e. the region to be measured of the transparent cover plate 40, the light source assembly 50 emits an incident light (such as the incident light A) to the finger to be measured, the incident light is partially absorbed by the finger to be measured, and partial reflection is generated to form a reflected light, the reflected light is collected by the imaging unit to obtain corresponding light intensity information, the light intensity information comprises image information and spectrum information, the image information is used for fingerprint image identification, and the spectrum information is used for spectrum data analysis to perform living body judgment, i.e. the fingerprint is identified through the light intensity information after the reflected light is received by the spectrum chip. After the light generated by the light source 51 is homogenized, a portion of the incident light (e.g., incident light B) entering the transparent cover 40 may directly enter the spectrum chip 10 through the lower surface 402 of the transparent cover 40, which may cause recognition noise and inaccurate results.

It should be noted that, in the fingerprint identification process, when the incident light reaches the collecting area 41 in the transparent cover 40, if the incident light irradiates the contact area between the finger and the transparent cover 40, diffuse reflection occurs, and at this time, part of the incident light enters the spectrum chip 10; whereas there will be a gap area between the finger and the transparent cover plate (this area is filled with air) due to the presence of fingerprint valleys and ridges, this portion of the incident light will be specularly reflected. Therefore, the stronger the incident light energy required to be irradiated to the object to be measured is, the more advantageous the recognition accuracy is.

As shown in fig. 17A and 17B, unlike the above preferred embodiment, the transparent cover 40 further includes a light shielding layer 43, wherein the light shielding layer 43 is disposed on the lower surface 402 of the transparent cover 40, wherein the light shielding layer 43 may be, but is not limited to, a reflective film or an absorptive film for reflecting or absorbing light passing through the lower surface 402 of the transparent cover 40. Preferably, in the preferred embodiment of the present invention, the light shielding layer 43 is attached to or coated on the non-collecting portion 42 of the transparent cover 40. As shown in fig. 17B, it is possible to prevent a part of the incident light B from entering the spectrum chip 10 without affecting the entering of the incident light a into the spectrum chip.

Preferably, in the preferred embodiment of the present invention, the light shielding layer 43 is a reflective film formed on the non-collecting portion 42 of the transparent cover 40, wherein the light emitted from the light source assembly 50 enters the transparent cover 40 along the incident light path 410. It can be understood that a portion of the light (light B) emitted from the light source assembly 50 is projected onto the light shielding layer 43 of the transparent cover 40, and the light (light a) reflected by the light shielding layer 43 is projected onto the upper surface 401 of the collecting portion 41 of the transparent cover 40. The incident light B reaches the lower surface, and the reflection film is arranged, so that the incident light B can be reflected, the corresponding light can reach the object to be detected due to reflection, and the energy reaching the object to be detected is improved.

As shown in fig. 18, unlike the above preferred embodiment, the fingerprint recognition module further includes a light condensing layer 70, wherein the light condensing layer 70 is disposed on the upper surface 401 of the transparent cover 40. It should be noted that, the light-gathering layer 70 is made of a material with a high refractive index, and the refractive index of the light-gathering layer 70 is greater than that of the transparent cover 40, so that the light of the transparent cover 40 is gathered on the light-gathering layer 70, and the light signal entering the inside of the identification module through the lower surface of the transparent cover 40 is stronger, so that the signal-to-noise ratio is higher. The light-condensing layer 70 is disposed on the collecting portion 41 of the transparent cover 40, and preferably, the light-condensing layer 70 covers the upper surface 401 of the transparent cover 40.

As shown in fig. 18, when the incident light emitted from the light source 51 is homogenized by the light homogenizing member 52, the incident light enters the transparent cover 40 and then enters the light condensing layer 70, and the refractive index of the transparent cover 40 is lower than that of the light condensing layer 70, so that the incident light is considered to enter the light-dense material from the light-sparse material, and the refraction angle is reduced. As shown by the incident light a indicated by the dotted line, the incident light a enters the light-condensing layer 70, reaches the gap area, is specularly reflected, and enters the fingerprint module through the transparent cover 40. The incident light B is reflected by the light shielding layer 43 and enters the light focusing layer 70 to reach the contact area to generate diffuse reflection, and when the angle of the diffuse reflected incident light is smaller than a critical value, part of the incident light enters the transparent cover plate, such as the incident light B1; the incident light B2 has a larger diffuse reflection angle, and is totally reflected beyond a critical angle, so that the incident light B2 does not enter the transparent cover 40. The incident light C shown by the solid line enters the condensing layer and then has a larger refraction angle, and when the refraction angle is larger than the critical angle, total reflection is generated.

It will be appreciated that the light-gathering layer 70 may enhance the energy of the incident light reaching the collecting portion 41 of the transparent cover 70, and at the same time, utilize the total reflection caused by the refractive index of the light-gathering layer 70 being greater than the refractive index of the transparent cover 40 to filter out some incident light with a larger angle.

As shown in fig. 19A and 19B, the total impact number of the side where the light-condensing layer 70 is disposed will be increased by approximately 3.6% under the same condition, and it can be understood to a certain extent that the design of the light-condensing layer 70 makes more light be concentrated in the light-condensing layer 70, so that the light energy reaching the finger to be tested is more, and the overall test effect will be better.

In addition, the living body fingerprint identification system further comprises a triggering unit, and when the to-be-detected body approaches to the living body fingerprint identification system, the triggering unit sends an instruction to enable the living body fingerprint identification system to start working. The trigger unit may be a trigger capacitor, etc., and is disposed on the circuit board and electrically connected to the circuit board.

According to another aspect of the present invention, there is further provided a living body fingerprint identification method, wherein in the present embodiment, the spectral information does not necessarily need to restore the spectral curve to perform living body judgment, but may directly perform living body judgment according to the spectral response.

In detail, acquiring reference spectral response data of an image sensor of the spectrum-based analysis device to a reference object; acquiring identification spectrum response data of an object to be identified by the image sensor of the spectrum-based analysis device; and determining a recognition result of the object to be recognized based on a comparison result of the reference spectral response data and the recognition spectral response data.

The application further provides a living fingerprint detection method based on the living fingerprint identification equipment, wherein the spectrum chip obtains original data, namely light intensity information, the light intensity information comprises image information and spectrum information, and the original data is subjected to image information correction and spectrum information correction respectively; then, respectively adopting a fingerprint identification algorithm and a living body algorithm, and comparing the fingerprint image with spectrum information with corresponding reference information extracted during input to obtain a matching degree; when the matching degree of the two is higher than the threshold value, inputting verification is passed; otherwise, outputting verification failure.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application but not limited to those having similar functions are replaced with each other.

Claims

1. Fingerprint detection module, its characterized in that includes:

a spectrum chip;

a bracket;

2. The fingerprint detection module according to claim 1 wherein said transparent cover further has an upper surface and a lower surface, wherein said upper surface is opposite to said lower surface, said light source assembly is disposed outside said non-collecting portion of said transparent cover, emits light in the direction of said transparent cover, and forms at least one incident light path between said upper surface and said lower surface of said transparent cover.

3. The fingerprint detection module of claim 2, wherein the light source assembly comprises at least one light source and at least one light homogenizing member, the light homogenizing member being located between the light source and the transparent cover plate.

4. The fingerprint detection module according to claim 3, wherein said light homogenizing member is integrally formed on an outer side of said non-collecting portion of said transparent cover plate.

5. The fingerprint detection module according to claim 3, wherein the light source and the light homogenizing member surround the transparent cover plate, and the light emitted by the light source vertically enters the light homogenizing member and then enters the transparent cover plate through the light homogenizing member in a horizontal direction.

6. The fingerprint detection module of claim 3, further comprising an optical component disposed in a photosensitive path of the spectral chip, wherein the optical component is supported by the bracket between the transparent cover plate and the spectral chip.

7. The fingerprint detection module according to claim 6, wherein said stand comprises a stand body and an extension unit integrally extending inwardly from said stand body, wherein said light source assembly and said transparent cover plate are supported at an upper end of said stand body, and said optical assembly is fixedly supported by said extension unit.

8. The fingerprint detection module of claim 6, wherein the rack comprises a first rack and a second rack, wherein the first rack is located outside the second rack, the transparent cover plate and the light source assembly are supported at an upper end of the first rack, and the optical assembly is fixed and supported by the second rack.

9. The fingerprint detection module according to any one of claims 2-8, wherein said transparent cover plate further comprises a light shielding layer, wherein said light shielding layer is arranged at said lower surface of said transparent cover plate.

10. The fingerprint detection module of claim 9, wherein the light shielding layer is selected from a combination of materials consisting of a reflective film and an absorptive film.

11. The fingerprint detection module according to any one of claims 2-8, further comprising a light focusing layer, wherein the light focusing layer is disposed on the upper surface of the transparent cover plate, and the refractive index of the light focusing layer is greater than the refractive index of the transparent cover plate.

12. The fingerprint detection module of claim 9, further comprising a light gathering layer, wherein the light gathering layer is disposed on the upper surface of the transparent cover plate, and wherein the refractive index of the light gathering layer is greater than the refractive index of the transparent cover plate.

13. The fingerprint detection module of claim 1, wherein the spectral chip has a modulated region and a non-modulated region, the modulated region being centrally disposed at four corners or peripheral regions of the spectral chip, the non-modulated region being located at a central region of the spectral chip.

14. The fingerprint detection module of claim 1, wherein the optical component of the fingerprint detection module is a micro-structured array, the spectral chip comprises a light filtering structure and an image sensor, wherein the micro-structured array and the light filtering structure are positioned on a photosensitive path of the image sensor, and the micro-structured array, the light filtering structure and the image sensor are sequentially stacked and integrated.

15. The fingerprint detection module of claim 1, wherein the incident light emitted by the light source assembly has an energy of 80% or more in the 400-600nm band.

16. The living body fingerprint identification system is characterized by comprising:

a control unit;

the fingerprint detection module according to any one of claims 1 to 15; and