CN111444888A - Biological feature detection device, electronic apparatus, and biological feature detection method - Google Patents
Biological feature detection device, electronic apparatus, and biological feature detection method Download PDFInfo
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Abstract
The present invention relates to a biometric detection apparatus, an electronic device, and a biometric detection method, the biometric detection apparatus: the optical structure comprises a structured light-transmitting layer, wherein the structured light-transmitting layer comprises at least two light-transmitting regions which are respectively used for transmitting different characteristic light, the different characteristic light is used for representing different characteristics of an object, and the structured light-transmitting layer at least comprises first characteristic light which is used for representing biological characteristics of the object; and the sensing structure is positioned below the optical structure and used for receiving the optical signal penetrating through the optical structure, generating a corresponding optical sensing signal and processing the optical sensing signal to obtain a characteristic detection signal corresponding to the characteristic of the object to be detected.
Description
Technical Field
The present invention relates to the field of sensing technologies, and in particular, to a biometric detection apparatus, an electronic device, and a biometric detection method.
Background
With the increasing degree of intelligence of terminal electronic products, portable mobile devices including mobile phones and wearable devices, and information systems such as various databases increasingly use a user authentication mechanism to authorize or protect access qualification of personal information data.
The secure access to the device can be realized in different manners, one of which is most common to use a user password, but the user password can be easily obtained or cracked, and the user needs to remember the password, and once the user forgets the password, the user needs to perform some password recovery procedures to obtain authentication, or to obtain access right to the device again in other manners, and such complicated operation procedures bring much inconvenience to the actual use process of the user.
Yet another way is to use personal fingerprinting or other biometric identifiers to enable user authentication or access rights on an electronic device or data system to enhance data security. Recently, the development trend of electronic products such as mobile phones is approaching to the full-screen and light and thin direction, and the full-screen carries a biological detection and identification module under the screen, so that the perfectly designed full-screen effect which does not affect the appearance and the user experience becomes the research focus of various mobile phone manufacturers. The detection beam is sent through the display screen or transmitted for biometric detection. The light intensity of the detection light beam penetrating through the screen can directly influence the detection and the identification of the biological characteristic identification module on the biological characteristic identification; some equipment manufacturers provide a scheme for placing a backlight module under the screen and opening holes on the whole display screen, or use a backlight source and the backlight module with an optical film layer to perform wavelength conversion on backlight beams with specific wavelengths, simultaneously diffuse the backlight beams after the wavelength conversion, mix the backlight beams with different wavelengths into white light and provide the white light for the display panel to transmit detection beams. The former proposal has complex process and poor integral display effect of the screen caused by the opening of the screen and the backlight module which need to be carried. In the latter scheme, the product structure design is complex, and the selection of light beams emitted by the backlight light source needs to be strictly controlled and designed.
How to simplify the structure of the under-screen detection device is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a biological detection device, an electronic device and a biological characteristic detection method, and the structure of the detection device is simplified.
In order to solve the above problems, the present invention provides a biometric detection apparatus including: the optical structure comprises a structured light-transmitting layer, wherein the structured light-transmitting layer comprises at least two light-transmitting regions which are respectively used for transmitting different characteristic lights, and the different characteristic lights are used for representing different characteristics of an object, wherein the structured light-transmitting layer at least comprises a first characteristic light and is used for representing biological characteristics of the object; and the sensing structure is positioned below the optical structure and used for receiving the optical signal penetrating through the optical structure, generating a corresponding optical sensing signal and processing the optical sensing signal to obtain a characteristic detection signal corresponding to the characteristic of the object to be detected.
Optionally, the characteristic detection signal is indicative of at least one optical parameter of the characteristic light.
Optionally, the optical parameter includes at least one of light intensity or polarization.
Optionally, the structured light-transmitting layer includes more than two stacked light-transmitting films with different wavelength transmittances, and/or filters distributed in regions corresponding to different wavelength ranges, and/or polarizers distributed in regions with different polarization angles.
Optionally, the system further comprises a second characteristic light for characterizing the surface structure of the object.
Optionally, the wavelength range of the first characteristic light covers the wavelength of light which can be transmitted through the organism; the wavelength range of the second characteristic light covers at least part of the wavelength capable of being reflected by the measured object.
The technical scheme of the invention also provides electronic equipment capable of detecting biological characteristics, which comprises: a light-transmissive contact layer; the biometric detection device according to any of the above claims, located inside the electronic device, and mounted below the contact layer, wherein the optical structure of the biometric detection device is disposed towards the contact layer.
Optionally, the method further includes: and the identification module is connected with the biological characteristic detection device and used for acquiring characteristic information according to the characteristic detection signal acquired by the biological characteristic detection device and judging whether the characteristic information is positioned in a set biological characteristic range.
Optionally, the characteristic information is a ratio of light intensities of the two characteristic lights.
Optionally, a backlight light source is further disposed below the contact layer of the electronic device, or the contact layer is a self-luminous layer, and light emitted from the backlight light source or the self-luminous layer is used as structure detection light for biological detection, so as to detect surface structure features of an object.
Optionally, the identification module is further configured to obtain feature information according to a feature detection signal generated by the second feature light representing the structural feature, and identify the structural feature of the surface of the object to be measured.
Optionally, the method further includes: an auxiliary light source and a control module; the auxiliary light source is used for emitting biological detection light, wherein at least part of light waves in the biological detection light are first characteristic light for representing biological characteristics of an object; the control module is connected with the auxiliary light source and is used for controlling the auxiliary light source to emit biological detection light during biological detection.
The technical scheme of the invention also provides a biological characteristic detection method, which comprises the following steps: irradiating the object to be measured with detection light including at least biological detection light; at least two kinds of characteristic light generated after the detection light irradiates the object to be detected are respectively received in at least two kinds of light transmission areas, corresponding optical sensing signals are generated, and different characteristic light is used for representing different characteristics of the object, wherein the characteristic light at least comprises first characteristic light used for representing biological characteristics of the object; and processing the optical sensing signals to obtain characteristic detection signals corresponding to the characteristics of the object to be detected.
Optionally, the characteristic detection signal is indicative of at least one optical parameter of the characteristic light.
Optionally, the optical parameter includes at least one of light intensity or polarization.
Optionally, the system further comprises a second characteristic light for characterizing the surface structure of the object.
Optionally, the wavelength range of the first characteristic light covers the wavelength of light which can be transmitted through the organism; the detection light further comprises structure detection light, and the wavelength range of the second characteristic light covers at least part of the wavelength of the structure detection light capable of being reflected by the object to be detected.
Optionally, including providing an electronic device having a light-transmissive contact layer; the structure detection light is emitted by a backlight light source disposed below a contact layer inside the electronic device, or by the contact layer itself.
Optionally, the method further includes obtaining feature information according to the feature detection signal, and determining whether the feature information is within a set biological feature range.
Optionally, the characteristic information is a light intensity ratio of different characteristic lights.
Optionally, the method further includes: and identifying the structural characteristics of the surface of the measured object according to the characteristic detection signal generated by the second characteristic light.
Optionally, the biological detection light comprises a portion of ambient light and/or light of a particular wavelength range generated by an auxiliary detection light source.
In the biological characteristic detection device, the characteristic light in different wavelength ranges is received through the structured light-transmitting layer, and the first characteristic light is used for representing biological characteristics, so that whether a detected object is a living body or not can be judged according to a received characteristic detection signal of the first characteristic light in the detection process of the biological characteristic detection device, and discrimination of deception equipment is realized. Further, the characteristic detection signal of the second characteristic light or more characteristic lights with different wave bands or characteristics is used for realizing the characteristic detection of the surface structure or other aspects of the object to be detected. The whole biological characteristic detection device is simple in structure, and the detection of characteristics of multiple aspects of a detected object is realized only by arranging the light transmission areas with more than two different wave bands through the structured light transmission layer, so that the detection reliability is improved.
Drawings
FIG. 1 is a schematic structural diagram of a biometric device according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a structured light transparent layer of a biometric device according to an embodiment of the present invention;
FIG. 3 is a schematic top view of a structured light transparent layer of a biometric device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an electronic device according to an embodiment of the invention;
FIG. 5 is a diagram illustrating an electronic device performing fingerprint detection according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Detailed Description
The following describes in detail specific embodiments of a biometric device, an electronic apparatus, and a biometric method according to the present invention with reference to the drawings.
Fig. 1 is a schematic structural diagram of a biometric apparatus according to an embodiment of the present invention.
The biometric detection device includes: an optical structure 120 and a sensing structure 110.
The optical structure 120 is used for focusing, filtering and the like of an optical signal, so that a light wave meeting requirements is transmitted through the optical structure 120 to the sensing structure 110; the sensing structure 110 is located below the optical structure 120, and is configured to receive the optical signal transmitted through the optical structure 120 and generate a corresponding optical sensing signal, and process the optical sensing signal to obtain a feature detection signal corresponding to a feature of the object to be detected, thereby implementing detection of the biological feature.
Specifically, the optical structure 120 includes a structured light-transmitting layer, where the structured light-transmitting layer includes at least two light-transmitting regions, and the at least two light-transmitting regions are respectively used for transmitting characteristic lights in different wavelength ranges, and the different characteristic lights are used for representing different characteristics of an object, where the at least one light-transmitting region includes at least a first characteristic light used for representing a biological characteristic of the object. In addition to the structured light-transmissive layer, the optical structure also includes other optical elements in existing optical sensors, such as lenses, transparent substrates, and the like.
In this embodiment, the optical structure 120 includes a substrate 122, a structured light-transmitting layer 123 on a surface of the substrate 122, and an optical layer 124 above the structured light-transmitting layer 123. The substrate 122 may be a transparent substrate such as a glass substrate or a PMMA substrate. The structured light-transmissive layer 123 includes a first light-transmissive region 1231 and a second light-transmissive region 1232, which are respectively configured to transmit light in two different wavelength ranges. For example, the first light-transmitting region 1231 transmits the first characteristic light having a wavelength range of a1 to a2, the second light-transmitting region 1232 transmits the second characteristic light having a wavelength range of b1 to b2, and the incident light passes through the structured light-transmitting layer 123, and then only the light having wavelength ranges of a1 to a2 and b1 to b2 can be transmitted, and the incident light transmits in different regions.
Fig. 2 is a schematic top view of the structured transparent layer 123 of the present invention. The first light-transmitting region 1231 in the structured light-transmitting layer 123 is disposed between the two second light-transmitting regions 1232.
In this embodiment, the biometric detection device is used for underscreen fingerprint recognition. The first light-transmitting area 1231 is used for transmitting first characteristic light capable of representing biological characteristics of a measured object, and according to the first characteristic light, whether the measured object is a biological object or a forged mold or equipment can be identified; the second light-transmitting area 1232 is used for transmitting the surface structure characteristic of the object to be characterized, and according to the second characteristic light, the texture characteristic of the surface of the object to be detected, such as a fingerprint pattern on the surface of a finger, can be identified for fingerprint identification.
For an application scene of fingerprint identification, the first light-transmitting area 1231 and the second light-transmitting area 1232 are both symmetrically arranged about a symmetry axis of the structured light-transmitting layer 123, and the area of the first light-transmitting area 1231 is smaller than that of the second light-transmitting area 1232, so that more second characteristic light can penetrate through the structured light-transmitting layer 123 and be received by the sensing structure, and therefore more comprehensive identification of a fingerprint graph is easier to realize; the first characteristic light is only used for judging whether the object to be measured is a real human finger, so that the area of the first light-transmitting area 1231 is smaller.
Fig. 3 is a schematic diagram illustrating distribution of a first light-transmitting region 1231a and a second light-transmitting region 1232a in a light-transmitting layer with a structure in another embodiment.
In other specific embodiments, the structured light-transmitting layer having two or more light-transmitting regions may be reasonably arranged according to the characteristics of the target detection object of the biological characteristic detection device, and a person skilled in the art may reasonably arrange the number, area and distribution position of the light-transmitting regions according to needs.
In another specific embodiment, the structured light-transmitting layer includes three light-transmitting regions for transmitting a first characteristic light, a second characteristic light and a third characteristic light, respectively, wherein the first characteristic light is used for characterizing biological characteristics, the second characteristic light is used for characterizing surface structure characteristics of the object, and the third characteristic light is used for characterizing polarized light in a specific direction to characterize the material properties of the object to be photographed. For biological anti-counterfeiting application, the first characteristic light is used for measuring the reflection and absorption characteristics of the surface of an object to different frequency wavelengths, the second characteristic light is used for measuring the spatial structure of the surface of the object, and the third characteristic light is used for measuring the influence of the material of the surface of the object on the polarization angle of light. The three kinds of optical information are combined together, and can be used for distinguishing the skin surface of a real organism from various simulated materials, so that the biological anti-counterfeiting function is realized.
The structured light-transmissive layer 123 may include filters distributed in regions corresponding to different wavelength ranges, for example, a filter corresponding to a wavelength range a 1-a 2 is used in the first light-transmissive region 1231, and a filter corresponding to a wavelength range b 1-b 2 is used in the second light-transmissive region 1232.
In other embodiments, the structured light-transmitting layer 123 may also be a light-transmitting film including two or more stacked layers with different wavelength transmittances, and different light-transmitting regions are formed by performing doping and other processes on each light-transmitting film layer at different positions, changing an atom arrangement structure in the film layer, and the like.
In other embodiments, the structured light-transmitting layer 123 may further include polarizers distributed in regions respectively corresponding to different polarization angles, so as to form light-transmitting regions corresponding to different polarization angles.
The optical layer 124 in the optical structure 120 may be a microlens layer for focusing incident light; in other embodiments, the optical layer 124 may be other optical element layers, for example, the optical layer 124 has an array of small holes, and uses the principle of small hole imaging to focus incident light, and so on. The optical layer 124 may also include other optical structures such as gratings, diaphragms, and the like.
In this embodiment, the structured light-transmitting layer 123 is located below the optical layer 124, and in other embodiments, the structured light-transmitting layer 123 may also be formed above the optical layer 124.
The sensing structure 110 is located under the optical structure 120, and the sensing structure 110 and the optical structure 120 are fixed by an adhesive layer 130.
The sensing structure 110 includes a substrate 111 and a sensing array 112 formed on a surface of the substrate 111, wherein a plurality of sensing units distributed in an array are formed in the sensing array 112, and the sensing units may be CMOS or CCD image sensing units, and are configured to receive optical signals and output corresponding optical sensing signals, for example, convert incident optical signals into electrical signals. A logic processing unit may be further formed in the substrate 111, and configured to perform one or more of noise reduction, amplification and analog-to-digital conversion on the optical sensing signals output by the sensing array 112, so as to obtain feature detection signals corresponding to features of an object to be detected.
Different light-transmitting areas in the structured light-transmitting layer 123 respectively correspond to different positions in the sensor array 112 in physical positions, so that the sensor units in the corresponding areas in the sensor array 112 receive the characteristic light in the corresponding wavelength ranges, thereby obtaining detection signals of different characteristic lights. In this embodiment, a detection signal of the first characteristic light and a detection signal of the second characteristic light can be obtained through the sensing structure, wherein the detection signal of the first characteristic light corresponds to a biological feature of the object, and the detection signal of the second characteristic light corresponds to a surface structure feature of the object.
In this embodiment, the biometric detection device is used for fingerprint detection, and the first characteristic light may be red light or near infrared light with a wavelength of 600nm or more, and may be present in ambient light and may penetrate through a finger. If the detected object is a real human finger, the biological detection device can receive the first characteristic light; if the object to be measured is a non-biological object such as a simulation device or a model, the first characteristic light cannot penetrate through the object to be measured, and therefore the biological detection device cannot receive the first characteristic light, and discrimination can be performed through the received characteristic detection signal of the first characteristic light. The first characteristic light is characterized by the permeability of the organism to red light and infrared light of a partial waveband. The wavelength range of the first characteristic light may be set to coincide with a wavelength range of a transmitted light wave that can be transmitted through a living organism in external light, be larger than the wavelength range of the transmitted light wave, or acquire only a characteristic detection signal of a part of the transmitted light wave in a light wave range that is smaller than the wavelength range of the transmitted light wave. In one embodiment, the wavelength range of the first characteristic light may be 600nm to 1100 nm.
The second characteristic light may be normal visible light covering at least a portion of the wavelength that is reflected by the object to be measured. For example, in the case of fingerprint identification under the screen, the second characteristic light may be white light emitted by a backlight source under the screen or self-illumination of the screen, and reflected light after reflection. The reflected light of the ridges and the valleys of the fingerprint is different, so that the reflected light carries the fingerprint information of the user, and the characteristic detection signal of the second characteristic light can represent the texture characteristics of the surface of the fingerprint of the finger, so that the fingerprint identification is realized. Specifically, the characteristic detection signal of the second characteristic light includes detection signals output by each sensing unit in an area receiving the second characteristic light in the sensing array 112, for example, when the characteristic detection signal is a digital signal, 1 indicates that the light intensity is strong and corresponds to a ridge; 0 indicates that the intensity is small, corresponding to a valley; because the texture distribution of the fingerprint presents a certain distribution, the detection of the fingerprint can be realized through the characteristic detection signals output by the sensing units at all positions.
The characteristic detection signal comprises at least one optical parameter of the characteristic light, and in this embodiment, the characteristic detection signal is indicative of the light intensity of the characteristic light. In other embodiments, the optical parameter may be at least one of an optical intensity or an optical characteristic such as polarization.
The polarization information can be obtained by filtering polarized light in a certain direction by using a polarized light coating film. The light intensity information can be obtained by photoelectric conversion through the lower sensor pixel and the number of electrons obtained by conversion.
In a specific embodiment of the present invention, since the first characteristic light is used to characterize a biological characteristic, in a detection process of the biological characteristic detection apparatus, whether a detected object is a biological object can be determined according to a received characteristic detection signal of the first characteristic light, so as to realize discrimination of a spoof device. Further, even if the same biological subject is used, the characteristic detection signals of the first characteristic light may be different between different biological subjects, and for example, the characteristic detection signals of the first characteristic light may be different depending on the ratio of fat and muscle of fingers of different human bodies. Therefore, the biological body can be identified according to whether the characteristic detection signal of the first characteristic light of the measured object is in the set biological characteristic range; and on the basis, the identification of the user identity is realized. Furthermore, the characteristic detection of the surface structure or material of the object to be detected and other aspects is realized through the characteristic detection signals of the second characteristic light or more characteristic lights with different wave bands or different characteristics representing the organism. The whole biological characteristic detection device is simple in structure, and the detection of characteristics of multiple aspects of a detected object is realized only by arranging the light transmission areas with more than two different wave bands through the structured light transmission layer, so that the detection reliability is improved.
The technical scheme of the invention also provides electronic equipment adopting the biological characteristic detection device. The electronic equipment can be mobile phones, tablet computers, notebook computers and other electronic equipment.
Referring to fig. 4, the electronic apparatus includes a light-transmissive contact layer 400 as a detection window; the biometric detection device is located inside the electronic device, and is mounted below the contact layer, and the optical structure 120 of the biometric detection device is disposed toward the contact layer 400, so that the optical structure 120 can be irradiated by the optical signal incident through the contact layer 400.
In some embodiments, the touch layer 400 may be a screen of an electronic device, which may be a non-self-luminous display such as a liquid crystal display or other passive light emitting display, a self-luminous screen such as an O L ED screen, a backlight source disposed inside the electronic device as a detection light source for the non-self-luminous display, and a screen glow source as a detection light source for the self-luminous screen.
Please refer to fig. 5, which is a schematic diagram of the electronic device performing fingerprint detection.
The light emitted by the backlight light source or the self-luminous screen of the electronic equipment is used as the structure detection light during the biological detection, and is used for detecting the surface structure characteristics of the object. The feature detection light is transmitted through the contact layer 400, irradiated to the finger surface, reflected by the finger surface, and received by the biometric detection device through the contact layer 400.
The ambient light serves as biological detection light, wherein a part of the wavelength band of the biological detection light can penetrate through the finger and further penetrate through the contact layer 400.
The biometric detection device is capable of receiving at least a portion of the structure detection light as first feature light and receiving all or a portion of the wavelength band of the ambient light that can penetrate the finger as second feature light through the optical structure 120, and acquiring feature detection signals of the first feature light and the second feature light.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
The electronic device comprises a biometric detection apparatus 601, an identification module 602, a control module 603 and a light source module 604.
The light source module 604 may be a backlight light source below the contact layer or a contact layer capable of emitting light, and is used for emitting detection light. The control module 603 is configured to control the light source module 604 to emit detection light when detecting the biological characteristics. The range of the light wave emitted by the detection light can be set according to requirements, can be consistent with screen light when the electronic equipment is used, and can also be a wave band modulated in addition.
The identification module 602 is connected to the biometric detection device 601, and configured to obtain feature information according to the feature detection signal obtained by the biometric detection device 601, and determine whether the feature information is within a set biometric range.
In a specific embodiment, the identification module 602 is configured to obtain characteristic information according to a characteristic detection signal of the first characteristic light obtained by the biological characteristic detection apparatus 601, where the characteristic information may be light intensity of the first characteristic light, determine whether the light intensity of the first characteristic light is greater than or equal to a set threshold, and if the light intensity of the first characteristic light is greater than the set threshold, enough first characteristic light can penetrate through the object to be measured, the object to be measured may be considered as an organism; if the light intensity of the first characteristic light is smaller than the set threshold value, the first characteristic light is proved to be incapable or almost incapable of penetrating through the measured object, and the measured object can be considered as a non-organism, so that deception of simulation equipment is avoided in the biological detection process. Different biological characteristic ranges can be set for the biological characteristics of different users, and the characteristic information is matched with the biological characteristic ranges to assist in identifying the identity of the user.
In another embodiment, the ratio of the characteristic detection signals of two kinds of characteristic light obtained by the biometric characteristic detection device 601 may be used as the characteristic information, for example, the light intensity ratio of the first characteristic light and the second characteristic light may be used as the characteristic information, and the light intensity ratio may be used as the characteristic information, so that the systematic error may be reduced, and the accuracy may be improved.
Further, the identification module 602 is further configured to obtain feature information to identify other features of the object to be detected according to the feature detection signal of the other feature light. For example, the structural feature of the surface of the object to be measured can be identified based on the feature detection signal generated by the second characteristic light for characterizing the structural feature. In a specific embodiment, the identification module 602 may obtain feature information corresponding to the surface texture feature of the finger according to the feature detection signal of the second feature light, so as to identify a fingerprint pattern of the finger, thereby implementing fingerprint identification. The property of the shot object material can be detected according to the third characteristic light which represents polarized light in a specific direction. For biological anti-counterfeiting application, the first characteristic light is used for measuring the reflection and absorption characteristics of the surface of an object to different frequency wavelengths, the second characteristic light is used for measuring the spatial structure of the surface of the object, and the third characteristic light is used for measuring the influence of the material of the surface of the object on the polarization of light. The three kinds of optical information are combined together, and can be used for distinguishing the skin surface of a real organism from various simulated materials, so that the biological anti-counterfeiting function is realized.
The electronic equipment can perform biological identification through the first characteristic light, can improve the accuracy of biological characteristic detection, avoids equipment deception and improves the accuracy of biological characteristic identification.
In other specific embodiments, the light source module 604 may further include an auxiliary light source for emitting biological detection light, wherein at least a portion of the light wave is first characteristic light for characterizing a biological feature of the object; the control module 603 is connected to the auxiliary light source, and when detecting a living body, the control module is configured to control the auxiliary light source to emit a biological detection light. Under the condition of adopting ambient light as biological detection light, the detection accuracy receives the influence of external environment luminous intensity easily, through setting up auxiliary light source alone, can supplement biological detection light under the weak condition of ambient light, improves the accuracy that biological characteristic detected. The electronic device may further include an ambient light detection module, and the control module 603 may selectively turn on the auxiliary light source according to the intensity of the ambient light, or may directly turn on the auxiliary light source when the biological characteristics are detected.
The invention also provides a biological characteristic detection method.
The biological characteristic detection method comprises the following steps:
step 1: irradiating the object to be measured with detection light including at least biological detection light.
The biological detection light is used for detecting whether the object to be detected is an organism or not, or for detecting characteristics related to the organism. For example, light waves of a specific wavelength that can penetrate a finger can be used as biological detection light for detecting whether an object to be detected is a real finger or a spoofing device. In some embodiments, the biological detection light includes a portion of ambient light and/or light of a particular wavelength range generated by an auxiliary detection light source.
Step 2: at least two kinds of characteristic light generated after the detection light irradiates the object to be detected are respectively received in at least two kinds of light transmission areas, corresponding optical sensing signals are generated, different characteristic light is used for representing different characteristics of the object, and the characteristic light at least comprises first characteristic light which is used for representing biological characteristics of the object.
The first characteristic light covers an optical band capable of characterizing biological features in the biological detection light. Other characteristic light may be used to characterize other characteristics of the object under test, such as temperature, surface structure, etc. In one embodiment, the method is used for detecting fingerprints, the first characteristic light can be used for characterizing the transmissivity of organisms to red light and infrared light of partial wave bands, the wave band range of the first characteristic light can be set to be consistent with the wave band of transmitted light waves capable of being transmitted through organisms in external light, be larger than the wavelength range of the transmitted light waves, or be smaller than the light wave range of the transmitted light waves, and only characteristic detection signals of the partial transmitted light waves are acquired. In one embodiment, the wavelength range of the first characteristic light may be 600nm to 1100 nm.
In some embodiments, at least one light-transmitting region is further included in the two light-transmitting regions for transmitting a second characteristic light, and the second characteristic light is used for characterizing the surface structure of the object. Correspondingly, the detection light further comprises structure detection light, and the wavelength range of the second characteristic light covers the wavelength of at least part of the structure detection light capable of being reflected by the object to be detected. For example, in the case of fingerprint identification under the screen, the second characteristic light may be white light emitted by a backlight source under the screen or self-illumination of the screen, and reflected light after reflection. The reflected light of the ridges and the valleys of the fingerprint is different, so that the reflected light carries the fingerprint information of the user, and the characteristic detection signal of the second characteristic light can represent the texture characteristics of the surface of the fingerprint of the finger, so that the fingerprint identification is realized.
In some embodiments, the light-transmissive region is configured to transmit the third characteristic light. The third characteristic light is used for representing polarized light in a specific direction so as to represent the material property of the shot object.
And step 3: and processing the optical sensing signals to obtain characteristic detection signals corresponding to the characteristics of the object to be detected.
The characteristic detection signal is characteristic for at least one optical parameter of the characteristic light. The optical parameter may comprise at least one of light intensity or polarization.
The biometric detection method further comprises: and acquiring characteristic information according to the characteristic detection signal, and judging whether the characteristic information is positioned in a set biological characteristic range.
In a specific embodiment, feature information is obtained according to the obtained feature detection signal of the first feature light, where the feature information may be light intensity of the first feature light, and whether the light intensity of the first feature light is greater than or equal to a set threshold is determined, and if the light intensity of the first feature light is greater than the set threshold, enough first feature light can penetrate through the object to be measured, the object to be measured may be considered as an organism; if the light intensity of the first characteristic light is smaller than the set threshold value, the first characteristic light is proved to be incapable or almost incapable of penetrating through the measured object, and the measured object can be considered as a non-organism, so that deception of simulation equipment is avoided in the biological detection process. Different biological characteristic ranges can be set for the biological characteristics of different users, and the characteristic information is matched with the biological characteristic ranges to assist in identifying the identity of the user.
In another embodiment, the ratio of the obtained characteristic detection signals of two kinds of characteristic light can be used as the characteristic information, for example, the light intensity ratio of the first characteristic light and the second characteristic light can be used as the characteristic information, and the light intensity ratio can be used as the characteristic information, so that systematic errors can be reduced, and accuracy can be improved.
Further, the characteristic information can be obtained according to the characteristic detection signal of other characteristic light to identify other characteristics of the object to be detected. For example, the structural feature of the surface of the object to be measured can be identified based on the feature detection signal generated by the second characteristic light for characterizing the structural feature. In a specific embodiment, the feature information corresponding to the surface texture features of the finger can be acquired according to the feature detection signal of the second feature light, so that the fingerprint pattern of the finger is identified, and fingerprint identification is realized. In a specific embodiment, the signal can be detected according to the characteristic of the third characteristic light to characterize the polarization information of the light, and the material characteristic of the detected object can be obtained.
For biological anti-counterfeiting application, the first characteristic light is used for measuring the reflection and absorption characteristics of the surface of an object to different frequency wavelengths, the second characteristic light is used for measuring the spatial structure of the surface of the object, and the third characteristic light is used for measuring the influence of the material of the surface of the object on the polarization of light. The three kinds of optical information are combined together, and can be used for distinguishing the skin surface of a real organism from various simulated materials, so that the biological anti-counterfeiting function is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (22)
1. A biometric detection device, comprising:
the optical structure comprises a structured light-transmitting layer, wherein the structured light-transmitting layer comprises at least two light-transmitting regions which are respectively used for transmitting different characteristic lights, and the different characteristic lights are used for representing different characteristics of an object, wherein the structured light-transmitting layer at least comprises a first characteristic light and is used for representing biological characteristics of the object;
and the sensing structure is positioned below the optical structure and used for receiving the optical signal penetrating through the optical structure, generating a corresponding optical sensing signal and processing the optical sensing signal to obtain a characteristic detection signal corresponding to the characteristic of the object to be detected.
2. The biometric detection device of claim 1, wherein the characteristic detection signal is indicative of at least one optical parameter of the characteristic light.
3. The biometric detection device of claim 2, wherein the optical parameter includes at least one of light intensity or polarization.
4. The device according to claim 1, wherein the structured light-transmitting layer comprises two or more stacked light-transmitting films having different wavelength transmittances, and/or area-distributed filters corresponding to different wavelength ranges, and/or area-distributed polarizers having different polarization angles.
5. The biometric sensing device of claim 1, further comprising a second signature light for characterizing surface texture features of the object.
6. The biometric sensing device according to claim 5, wherein the first characteristic light has a wavelength range covering a wavelength of light that can pass through a living body; the wavelength range of the second characteristic light covers at least part of the wavelength capable of being reflected by the measured object.
7. An electronic device capable of biometric detection, comprising:
a light-transmissive contact layer;
the biometric detection device according to any one of claims 1 to 6, located inside the electronic device, mounted below the contact layer, the optical structure of the biometric detection device being disposed towards the contact layer.
8. The electronic device of claim 7, further comprising: and the identification module is connected with the biological characteristic detection device and used for acquiring characteristic information according to the characteristic detection signal acquired by the biological characteristic detection device and judging whether the characteristic information is positioned in a set biological characteristic range.
9. The electronic device according to claim 8, wherein the characteristic information is a ratio of light intensities of the two characteristic lights.
10. The electronic device according to claim 7, wherein a backlight light source is further disposed below the contact layer of the electronic device, or the contact layer is a self-luminous layer, and light emitted from the backlight light source or the self-luminous layer is used as structure detection light for biological detection to detect surface structure features of an object.
11. The electronic device of claim 10, wherein the identification module is further configured to obtain feature information to identify the structural feature of the surface of the object to be measured according to a feature detection signal generated by a second feature light that characterizes the structural feature.
12. The electronic device of claim 10, further comprising: an auxiliary light source and a control module; the auxiliary light source is used for emitting biological detection light, wherein at least part of light waves in the biological detection light are first characteristic light for representing biological characteristics of an object; the control module is connected with the auxiliary light source and is used for controlling the auxiliary light source to emit biological detection light during biological detection.
13. A biometric detection method, comprising:
irradiating the object to be measured with detection light including at least biological detection light;
at least two different characteristic lights generated after the detection light irradiates the object to be detected are respectively received in at least two light transmission areas, and corresponding optical sensing signals are generated, wherein the different characteristic lights are used for representing different characteristics of the object, and at least comprise a first characteristic light which is used for representing biological characteristics of the object;
and processing the optical sensing signals to obtain characteristic detection signals corresponding to the characteristics of the object to be detected.
14. The biometric detection method of claim 13, wherein the signature detection signal is indicative of at least one optical parameter of the signature light.
15. The biometric detection method of claim 14, wherein the optical parameter includes at least one of light intensity or polarization.
16. The method according to claim 13, further comprising a second characteristic light for characterizing the surface structure of the object.
17. The method according to claim 13, wherein the first characteristic light has a wavelength range covering a wavelength of light that can pass through a living body; the detection light further comprises structure detection light, and the wavelength range of the second characteristic light covers at least part of the wavelength of the structure detection light capable of being reflected by the object to be detected.
18. The method of claim 17, comprising providing an electronic device having a light transmissive contact layer; the structure detection light is emitted by a backlight light source disposed below a contact layer inside the electronic device, or by the contact layer itself.
19. The method according to claim 13, further comprising obtaining feature information based on the feature detection signal and determining whether the feature information is within a set biometric range.
20. The method according to claim 19, wherein the characteristic information is a ratio of light intensities of different characteristic lights.
21. The biometric detection method according to claim 13, further comprising: and identifying the structural characteristics of the surface of the measured object according to the characteristic detection signal generated by the second characteristic light.
22. The biometric determination method of claim 13, wherein the biometric determination light comprises a portion of ambient light and/or light of a particular wavelength range generated by an auxiliary detection light source.
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