CN111444888A - Biological feature detection device, electronic apparatus, and biological feature detection method - Google Patents

Abstract

The present invention relates to a biological feature detection device, an electronic device and a biological feature detection method. The biological feature detection device includes an optical structure and a structured light-transmitting layer, wherein the structured light-transmitting layer includes at least two The light-transmitting regions are respectively used to transmit different characteristic lights, and the different characteristic lights are used to characterize different features of the object, wherein at least the first characteristic light is included to characterize the biological features of the object; the sensing structure is located in the Below the optical structure, it is used to receive the optical signal passing through the optical structure and generate the corresponding optical sensing signal, and process the optical sensing signal to obtain the feature detection signal corresponding to the feature of the measured object.

Description

Biometric detection device, electronic device and biometric detection method

technical field

The invention relates to the field of sensing technology, and in particular, to a biological feature detection device, an electronic device and a biological feature detection method.

Background technique

With the continuous improvement of the intelligence of terminal electronic products, more and more information systems such as portable mobile devices including mobile phones and wearable devices and various databases use user authentication mechanisms to authorize or protect the access qualifications of personal information and data. .

Security access to the device can be achieved in different ways, one of the most common is to use a user password, but the user password can be easily obtained or cracked, and the user needs to remember the password, once the password is forgotten, the user Some password recovery procedures are required to obtain authentication, or other methods are used to regain access to the device, and such a cumbersome operation procedure brings a lot of inconvenience to the actual use process of the user.

Another way is to use personal fingerprint identification or other biometric identifiers to achieve user authentication or access rights on electronic devices or data systems to enhance data security. Recently, the development trend of electronic products such as mobile phones is close to the direction of full screen and thin and light. The full screen is equipped with an under-screen biometric detection and identification module. Research focus of major mobile phone manufacturers. Sent through the display or through the detection beam for biometric detection. The light intensity of the detection beam passing through the screen will directly affect the detection and recognition of the biometric identification by the biometric detection and recognition module; some equipment manufacturers provide solutions for placing a backlight module under the screen and opening holes for the entire display screen, or, using The backlight source and the backlight module containing the optical film layer convert the wavelength of the backlight beam of a specific wavelength, and also diffuse the wavelength-converted backlight beam, and mix the backlight beams of different wavelengths into white light and provide it to the display panel. Used to transmit the detection beam. The former solution is not only complicated in process, but also requires the opening of the screen and the backlight module, resulting in a poor overall display effect of the screen. In the latter solution, the product structure design is more complicated, and the selection of the light beam emitted by the design backlight light source needs to be strictly controlled.

How to simplify the structure of the under-screen detection device is an urgent problem to be solved at present.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a biological detection device, an electronic device and a biological feature detection method, which simplifies the structure of the detection device.

In order to solve the above problems, the present invention provides a biometric detection device, comprising: an optical structure, including a structured light-transmitting layer, the structured light-transmitting layer comprising at least two light-transmitting regions, which are respectively used to transmit different light-transmitting regions. Characteristic light, different characteristic light is used to characterize different features of the object, wherein at least a first characteristic light is included, used to characterize the biological feature of the object; a sensing structure, located under the optical structure, is used to receive the transmitted through the The optical signal of the optical structure is generated and the corresponding optical sensing signal is generated, and the optical sensing signal is processed to obtain the feature detection signal corresponding to the feature of the measured object.

Optionally, the feature detection signal represents at least one optical parameter of the feature light.

Optionally, the optical parameter includes at least one of light intensity or polarization.

Optionally, the structured light-transmitting layer includes two or more stacked light-transmitting films with different wavelength transmittances, and/or regionally distributed filters corresponding to different wavelength ranges, and/or regionally distributed filters. Polarizers with different polarization angles.

Optionally, a second characteristic light is also included, which is used to characterize the surface structure characteristics of the object.

Optionally, the wavelength range of the first characteristic light covers the wavelength of light waves that can pass through the living body; the wavelength range of the second characteristic light covers at least part of the wavelengths that can be reflected by the measured object.

The technical solution of the present invention also provides an electronic device capable of biometric detection, comprising: a light-transmitting contact layer; the biometric detection device according to any one of the above, located inside the electronic device and installed in the Below the contact layer, the optical structure of the biometric detection device is disposed toward the contact layer.

Optionally, it also includes: an identification module, connected to the biological feature detection device, for obtaining feature information according to the feature detection signal obtained by the biological feature detection device, and judging whether the feature information is located in a set biological feature. within the characteristic range.

Optionally, the characteristic information is the light intensity ratio of two characteristic lights.

Optionally, a backlight light source is further provided under the contact layer of the electronic device, or the contact layer is a self-luminous layer, and the light emitted by the backlight light source or the self-luminous layer is used as the structural detection light during biological detection, and the It is used to detect the surface structure characteristics of objects.

Optionally, the identification module is further configured to acquire feature information according to the feature detection signal generated by the second feature light that characterizes the structural feature, and identify the structural feature of the surface of the object to be measured.

Optionally, it further includes: an auxiliary light source and a control module; the auxiliary light source is used to emit biological detection light, and in the biological detection light, at least part of the light waves are first characteristic light used to characterize the biological characteristics of the object; the control The module is connected to the auxiliary light source, and the control module is used for controlling the auxiliary light source to emit biological detection light when performing biological detection.

The technical solution of the present invention also provides a biological feature detection method, which includes: irradiating the measured object with detection light, the detection light at least including biological detection light; respectively receiving the detection light in at least two light-transmitting areas to illuminate the measured object At least two characteristic lights are then generated, and corresponding optical sensing signals are generated, and different characteristic lights are used to characterize different characteristics of the object, wherein at least the first characteristic light is included, which is used to characterize the biological characteristics of the object; The optical sensing signal is processed to obtain a feature detection signal corresponding to the feature of the measured object.

Optionally, the feature detection signal represents at least one optical parameter of the feature light.

Optionally, the optical parameter includes at least one of light intensity or polarization.

Optionally, it is characterized in that a second characteristic light is further included, which is used to characterize the surface structure features of the object.

Optionally, the wavelength range of the first characteristic light covers the wavelength of light that can pass through the living body; the detection light also includes structural detection light, and the wavelength range of the second characteristic light covers at least part of the object to be measured. The reflective structures detect wavelengths of light.

Optionally, it includes providing an electronic device with a light-transmitting contact layer; the structure detection light is emitted by a backlight light source disposed under the contact layer inside the electronic device, or emitted by the contact layer itself.

Optionally, the method further includes acquiring feature information according to the feature detection signal, and judging whether the feature information is within a set biological feature range.

Optionally, the feature information is the light intensity ratio of different feature lights.

Optionally, the method further includes: identifying the structural features of the surface of the measured object according to the feature detection signal generated by the second feature light.

Optionally, the biological detection light includes a part of ambient light and/or light in a specific wavelength range generated by the auxiliary detection light source.

In the biological feature detection device of the present invention, the structured light-transmitting layer receives characteristic light in different wavelength ranges. Since the first characteristic light is used to characterize biological features, during the detection process of the biological feature detection device, Whether the detected object is a living body can be determined according to the received characteristic detection signal of the first characteristic light, so as to realize the identification of the fraudulent device. Further, the feature detection of the surface structure or other aspects of the object to be measured is realized by the feature detection signals of the second feature light or more feature lights of different wavelength bands or features. The entire biometric detection device has a simple structure, and only through the provision of more than two light-transmitting regions with different wavelength bands in the structured light-transmitting layer, the detection of the characteristics of the detected object in various aspects is realized, and the detection reliability is improved.

Description of drawings

FIG. 1 is a schematic structural diagram of a biometric detection device according to a specific embodiment of the present invention;

2 is a schematic top view of a structured light-transmitting layer of a biometric detection device according to an embodiment of the present invention;

3 is a schematic top view of a structured light-transmitting layer of a biometric detection device according to an embodiment of the present invention;

4 is a schematic structural diagram of an electronic device according to a specific embodiment of the present invention;

5 is a schematic diagram of fingerprint detection performed by an electronic device according to a specific embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

The specific embodiments of the biometric detection device, the electronic device and the biometric detection method provided by the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a schematic structural diagram of a biological feature detection 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 and filtering the optical signal, so that the required light waves pass through the optical structure 120 to reach the sensing structure 110; the sensing structure 110 is located under the optical structure 120, It is used to receive the optical signal passing through the optical structure 120 and generate the corresponding optical sensing signal, and to process the optical sensing signal to obtain the feature detection signal corresponding to the feature of the measured object, so as to realize the detection of biological features. detection.

Specifically, the optical structure 120 includes a structured light-transmitting layer, and the structured light-transmitting layer includes at least two types of light-transmitting regions, which are respectively used to transmit characteristic light in different wavelength ranges, and different characteristic lights are used to characterize objects The different characteristics of the object, including at least a first characteristic light, are used to characterize the biological characteristics of the object. In addition to the structured light-transmitting layer, the optical structure also includes other optical elements in existing optical sensors, such as lenses, transparent substrates, and the like.

In this specific embodiment, the optical structure 120 includes a substrate 122 , a structured light-transmitting layer 123 located on the surface of the substrate 122 , and an optical layer 124 located above the structured light-transmitting layer 123 . The base 122 may be a transparent substrate such as a glass substrate, a PMMA substrate, or the like. The structured light-transmitting layer 123 includes a first light-transmitting area 1231 and a second light-transmitting area 1232, which are respectively used to transmit light in two different wavelength ranges. For example, the first light-transmitting area 1231 is used to transmit the first characteristic light with a wavelength range of a1-a2, and the second light-transmitting area 1232 is used to transmit the second characteristic light with a wavelength range of b1-b2. After passing through the structured light-transmitting layer 123, only light with wavelength bands a1-a2 and b1-b2 can be transmitted, and the light can be transmitted in different regions respectively.

Please refer to FIG. 2 , which is a schematic top view of the structured light-transmitting 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 specific embodiment, the biometric detection device is used for fingerprint recognition under the screen. The first light-transmitting area 1231 is used to transmit the first characteristic light that can characterize the biological characteristics of the measured object. According to the first characteristic light, the measured object can be identified as a living body or a counterfeit mold or equipment; The second light-transmitting area 1232 is used to pass through the surface structural features that can characterize the object. According to the second characteristic light, the texture features of the surface of the measured object, such as fingerprint patterns on the surface of a finger, can be identified for fingerprint identification.

For the application scenario of fingerprint recognition, the first light-transmitting area 1231 and the second light-transmitting area 1232 are symmetrically arranged with respect to the symmetry axis of the structured light-transmitting layer 123, and the area of the first light-transmitting area 1231 is smaller than that of all the The area of the second light-transmitting region 1232 is increased, so that more of the second characteristic light can pass through the structured light-transmitting layer 123 and be received by the sensing structure, so that it is easier to realize a more comprehensive identification of the fingerprint pattern; The first characteristic light is only used to determine whether the measured object is a real human finger. Therefore, the area of the first light-transmitting region 1231 is relatively small.

Please refer to FIG. 3 , which is a schematic diagram of the distribution of the first light-transmitting regions 1231 a and the second light-transmitting regions 1232 a in the structured light-transmitting layer in another implementation.

In other specific embodiments, a structured light-transmitting layer with two or more light-transmitting regions can also be reasonably set according to the characteristics of the target detection object of the biometric detection device. , and reasonably set the number, area and distribution position of the light-transmitting area.

In another specific embodiment, the structured light-transmitting layer includes three light-transmitting regions, which are respectively used to transmit first characteristic light, second characteristic light and third characteristic light, wherein the first characteristic light is used to characterize Biological characteristics, the second characteristic light is used to characterize the surface structure characteristics of the object, and the third characteristic light is used to characterize the polarized light in a certain direction to characterize the material properties of the photographed object. From the application of biological anti-counterfeiting, the first characteristic light is used to measure the reflection and absorption characteristics of different frequency wavelengths on the surface of the object, the second characteristic light is used to measure the spatial structure of the object surface, and the third characteristic light is used to measure the material of the surface of the object. The effect on the angle of polarization of light. The combination of these three kinds of light information can be used to distinguish the skin surface of real creatures from various simulated materials, so as to realize the function of biological anti-counterfeiting.

The structured light-transmitting layer 123 may include regionally distributed filters corresponding to different wavelength ranges. The light region 1232 uses a filter corresponding to the wavelength range b1-b2.

In other embodiments, the structured light-transmitting layer 123 may also include two or more stacked light-transmitting films with different wavelength transmittances, and the light-transmitting film layers at different positions are subjected to doping and other treatments. , changing the atomic arrangement structure in the film layer to form different light-transmitting areas.

In other embodiments, the structured light-transmitting layer 123 may further include polarizers distributed in regions 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 specific implementation manners, the optical layer 124 may also be other optical element layers, such as the optical layer 124 has small holes arranged in an array, and uses the principle of small hole imaging to focus the incident light and so on. The optical layer 124 may also include other optical structures such as gratings, diaphragms, and the like.

In this specific embodiment, the structured light-transmitting layer 123 is located below the optical layer 124 . In other specific 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 the surface of the substrate 111. A plurality of sensing units distributed in an array are formed in the sensing array 112, and the sensing units may be The CMOS or CCD image sensing unit is used to receive optical signals and output corresponding optical sensing signals, such as converting incident optical signals into electrical signals. A logic processing unit may also be formed in the substrate 111 to perform one or more processing of noise reduction, amplification and analog-to-digital conversion on the optical sensing signal output by the sensing array 112, and obtain and The feature detection signal corresponding to the feature of the measured object.

The different light-transmitting regions in the structured light-transmitting layer 123 correspond to different positions in the sensing array 112 in physical positions, so that the sensing units in the corresponding regions in the sensing array 112 receive the light in the corresponding wavelength range. characteristic light, so as to obtain detection signals of different characteristic light. In this specific embodiment, the detection signal of the first characteristic light and the 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 the biological characteristic of the object, and the second characteristic light The detected signal of the light corresponds to the surface structure features of the object.

In this specific embodiment, the biological detection device is used for fingerprint detection, and the first characteristic light may be red light or near-infrared light with a wavelength range of more than 600 nm, which exists in ambient light and can penetrate fingers. If the measured object is a real human finger, the biological detection device can receive the first characteristic light; if the measured object is a non-biological body such as an analog device or a model, the first characteristic light cannot penetrate, Therefore, the biological detection device will not be able to receive the first characteristic light, so that it can be discriminated by the characteristic detection signal of the received first characteristic light. The first characteristic light represents the transmittance of the organism to red light and infrared light in some wavelength bands. The wavelength band range of the first characteristic light can be set to be consistent with the wavelength band of the transmitted light wave that can pass through the living body in the external light, be larger than the wavelength range of the transmitted light wave, or be smaller than the light wave range of the transmitted light wave, only Obtain the feature detection signal of the partially transmitted light wave. In a specific embodiment, the wavelength range of the first characteristic light may be 600 nm˜1100 nm.

The second characteristic light may be ordinary visible light, covering at least part of the wavelengths that can be reflected by the object to be measured. For example, in the case of fingerprint recognition under the screen, the second characteristic light may be the white light emitted by the under-screen backlight light source or the self-illumination of the screen, and the reflected light after reflection. Since the reflected light of the ridges and valleys of the fingerprint is different, the reflected light carries the user's fingerprint information, so that the feature detection signal of the second feature light can characterize the texture features of the fingerprint surface of the finger, so as to realize Fingerprint recognition. Specifically, the characteristic detection signal of the second characteristic light includes the detection signal output by each sensing unit in the area of the sensing array 112 that receives the second characteristic light. For example, when the characteristic detection signal is a digital signal, 1 indicates that the light is strong , corresponds to the ridge; 0 means that the light intensity is small, corresponding to the valley; since the texture distribution of the fingerprint presents a certain distribution, the fingerprint detection can be realized by the feature detection signal output by the sensing unit at each position.

The characteristic detection signal includes at least one optical parameter of the characteristic light, and in this specific embodiment, the characteristic detection signal represents the light intensity of the characteristic light. In other specific embodiments, the optical parameter may be at least one of optical characteristics such as light intensity or polarization.

The polarization information can be obtained by using a polarized light coating to filter the polarized light in a certain direction, so as to obtain the polarization information of a specific area. The light intensity information can be converted by photoelectric conversion through the lower sensor pixels, and the light intensity information can be obtained by the number of electrons obtained by the conversion.

In a specific embodiment of the present invention, since the first characteristic light is used to represent biological features, in the detection process of the biological feature detection device, it can be determined according to the received characteristic detection signal of the first characteristic light. Detect whether the object is a living body, so as to realize the screening of deception devices. In addition, even if they are the same organism, the characteristic detection signals of the first characteristic light may be different for different organisms. The characteristic detection signals of the detected first characteristic light are different. Therefore, the identification of the biological body can be realized according to whether the characteristic detection signal of the first characteristic light of the measured object is within the set biological characteristic range; and on this basis, the identification of the user identity can be realized. Further, through the second characteristic light or the characteristic detection signals of more different wavelength bands or characteristic light representing different characteristics of the organism, the detection of other aspects such as the surface structure or material of the object to be measured is realized. The entire biometric detection device has a simple structure, and only through the provision of more than two light-transmitting regions with different wavelength bands in the structured light-transmitting layer, the detection of the characteristics of the detected object in various aspects is realized, and the detection reliability is improved.

The technical solution of the present invention also provides an electronic device using the above-mentioned biological feature detection device. The electronic device may be an electronic device such as a mobile phone, a tablet computer, and a notebook computer.

Please refer to FIG. 4 , the electronic device includes a light-transmitting contact layer 400 as a detection window; the biometric detection device is located inside the electronic device, installed under the contact layer, and the biometric detection device The optical structure 120 of the device is disposed toward the contact layer 400 , so that an optical signal incident through the contact layer 400 can be irradiated to the optical structure 120 .

In some specific embodiments, the contact layer 400 may be a screen of an electronic device, and the screen may be a non-self-luminous display screen, such as a liquid crystal display screen or other passive light-emitting display screen; the screen may also be a self-luminous display screen screen, such as an OLED screen. For a non-self-luminous display screen, the electronic device is further provided with a backlight light source as a detection light source; for a self-luminous screen, the screen light can be used as the detection light source.

Please refer to FIG. 5 , which is a schematic diagram of fingerprint detection performed by an electronic device.

The light emitted by the backlight light source of the electronic device or the self-luminous screen is used as the structure detection light during biological detection to detect the surface structure characteristics of the object. The feature detection light passes through the contact layer 400 , irradiates the surface of the finger, is reflected by the surface of the finger, and is received by the biometric detection device through the contact layer 400 .

The ambient light is used as the biological detection light, wherein the light in some wavelength bands of the biological detection light can penetrate the finger and then the contact layer 400 .

The biometric detection device can receive, through the optical structure 120, at least part of the structural detection light as the first characteristic light, and receive all or part of the wavelength band of the ambient light that can penetrate the finger as the first characteristic light. Two characteristic lights, and the characteristic detection signals of the first characteristic light and the second characteristic light are acquired.

Please refer to FIG. 6 , which is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

The electronic device includes a biometric detection device 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 under the contact layer or a luminous contact layer for emitting detection light. The control module 603 is configured to control the light source module 604 to emit detection light when performing biometric detection. The light wave range emitted by the detection light can be set according to requirements, which can be consistent with the screen light when the electronic device is in use, or can be another modulated wavelength band.

The identification module 602 is connected to the biological feature detection device 601, and is used to obtain feature information according to the feature detection signal obtained by the biological feature detection device 601, and to determine whether the feature information is within the set biological feature range. .

In a specific embodiment, the identification module 602 is configured to obtain feature information according to the feature detection signal of the first feature light obtained by the biometric detection device 601 , and the feature information may be the light intensity of the first feature light , determine whether the light intensity of the first characteristic light is greater than or equal to the set threshold, if it is greater than the set threshold, there is enough first characteristic light to penetrate the measured object, then the measured object can be considered as a living body; If the light intensity of the first characteristic light is less than the set threshold, it proves that the first characteristic light cannot or can hardly penetrate the measured object, and it can be considered that the measured object is a non-living body, so as to avoid the simulation equipment during the biological detection process. cheat. For the biometric features of different users, different biometric ranges can also be set, and the feature information is matched with the biometric range to assist in the identification of the user's identity.

In another specific embodiment, the ratio of the characteristic detection signals of the two characteristic lights obtained by the biometric detection device 601 may be used as the characteristic information, for example, the ratio of the light intensity of the first characteristic light and the second characteristic light As feature information, using the light intensity ratio as feature information can reduce systematic errors and improve accuracy.

Further, the identification module 602 is further configured to detect signals according to the characteristics of other characteristic lights, and obtain characteristic information to identify other characteristics of the object under test. For example, the structural feature of the surface of the object to be measured can be identified according to the feature detection signal generated by the second feature light used to characterize the structural feature. In a specific embodiment, the identification module 602 can obtain feature information corresponding to the texture features of the finger surface according to the feature detection signal of the second feature light, thereby identifying the fingerprint pattern of the finger and realizing fingerprint identification. The material properties of the object to be photographed can also be detected according to the third characteristic light representing the polarized light in a specific direction. From the application of biological anti-counterfeiting, the first characteristic light is used to measure the reflection and absorption characteristics of different frequency wavelengths on the surface of the object, the second characteristic light is used to measure the spatial structure of the object surface, and the third characteristic light is used to measure the material of the surface of the object. effect on light polarization. The combination of these three kinds of light information can be used to distinguish the skin surface of real creatures from various simulated materials, so as to realize the function of biological anti-counterfeiting.

The electronic device of the present invention can perform biometric identification through the first characteristic light, which can improve the accuracy of biometric detection, avoid equipment deception, and improve the accuracy of biometric identification.

In other specific embodiments, the light source module 604 may further include an auxiliary light source for emitting biological detection light, and in the biological detection light, at least part of the light waves are the first characteristic light used to characterize the biological characteristics of the object; the The control module 603 is connected to the auxiliary light source, and is configured to control the auxiliary light source to emit biological detection light when performing biological detection. In the case of using ambient light as the biological detection light, the detection accuracy is easily affected by the external ambient light intensity. By setting the auxiliary light source separately, the biological detection light can be supplemented in the case of weak ambient light, and the detection efficiency of the biological feature can be improved. accuracy. The electronic device may also have 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 directly turn on the auxiliary light source when biometric detection is required. light source.

A specific embodiment of the present invention also provides a biological feature detection method.

The biological feature detection method includes the following steps:

Step 1: Irradiate the measured object with detection light, the detection light at least includes biological detection light.

The biological detection light is used to detect whether the detected object is a biological body, or to detect its characteristics related to the biological body. For example, light waves of specific wavelengths that can penetrate fingers can be used as biodetection light to detect whether the detected object is a real finger or a spoofing device. In some embodiments, the biodetection light includes a portion of ambient light and/or light in a specific wavelength range generated by an auxiliary detection light source.

Step 2: Receive at least two characteristic lights generated after the detection light irradiates the measured object in the at least two light-transmitting areas, respectively, and generate corresponding optical sensing signals, and different characteristic lights are used to characterize different characteristics of the object, wherein , including at least the first characteristic light, which is used to characterize the biological characteristics of the object.

The first characteristic light covers a light band of the biological detection light capable of characterizing biological features. Other characteristic light can be used to characterize other characteristics of the measured object, such as temperature, surface structure, etc. In a specific embodiment, the method is used to detect fingerprints, the first characteristic light can be used to characterize the transmittance of an organism to red light and infrared light in some wavelength bands, and the first characteristic light can be The wavelength range of the device is set to be consistent with the wavelength band of the transmitted light wave that can pass through the living body in the external light, larger than the wavelength range of the transmitted light wave, or smaller than the light wave range of the transmitted light wave, and only obtain the characteristic detection signal of the partially transmitted light wave. . In a specific embodiment, the wavelength range of the first characteristic light may be 600 nm˜1100 nm.

In some specific implementation manners, the two light-transmitting regions further include at least one light-transmitting region for transmitting second characteristic light, and the second characteristic light is used to characterize the surface structure features of the object. Correspondingly, the detection light further includes structure detection light, and the wavelength range of the second characteristic light covers at least part of the wavelength of the structure detection light that can be reflected by the object to be measured. For example, in the case of fingerprint recognition under the screen, the second characteristic light may be the white light emitted by the under-screen backlight light source or the self-illumination of the screen, and the reflected light after reflection. Since the reflected light of the ridges and valleys of the fingerprint is different, the reflected light carries the user's fingerprint information, so that the feature detection signal of the second feature light can characterize the texture features of the fingerprint surface of the finger, so as to realize Fingerprint recognition.

In some specific embodiments, another light-transmitting area is further included for transmitting the third characteristic light. The third characteristic light is used to characterize the polarized light in a certain direction, so as to characterize the material properties of the object to be photographed.

Step 3: Process the optical sensing signal to obtain a feature detection signal corresponding to the feature of the detected object.

The feature detection signal characterizes at least one optical parameter of the feature light. The optical parameter may include at least one of light intensity or polarization.

The biological feature detection method further includes: acquiring feature information according to the feature detection signal, and judging whether the feature information is within a set biological feature range.

In a specific embodiment, according to the acquired characteristic detection signal of the first characteristic light, characteristic information is obtained, and the characteristic information may be the light intensity of the first characteristic light, and it is determined whether the light intensity of the first characteristic light is greater than or equal to equal to the set threshold, if it is greater than the set threshold, there is enough first characteristic light to penetrate the measured object, then the measured object can be considered as a living body; if the light intensity of the first characteristic light is less than the set threshold, It proves that the first characteristic light cannot or can hardly penetrate the measured object, and the measured object can be considered as a non-living body, so as to avoid the deception of the analog equipment during the biological detection process. For the biometric features of different users, different biometric ranges can also be set, and the feature information is matched with the biometric range to assist in the identification of the user's identity.

In another specific embodiment, the acquired ratio of the characteristic detection signals of the two characteristic lights may be used as the characteristic information, for example, the ratio of the light intensity of the first characteristic light and the second characteristic light may be used as the characteristic information, and the light intensity As feature information, the ratio can reduce systematic errors and improve accuracy.

Further, the characteristic information can also be obtained according to the characteristic detection signal of other characteristic light to identify other characteristics of the object under test. For example, the structural feature of the surface of the object to be measured can be identified according to the feature detection signal generated by the second feature light used to characterize the structural feature. In a specific embodiment, feature information corresponding to the texture feature of the finger surface can be obtained according to the feature detection signal of the second feature light, thereby identifying the fingerprint pattern of the finger and realizing fingerprint identification. In a specific embodiment, the signal can also be detected according to the characteristics of the third characteristic light to represent the polarization information of the light, and the material characteristics of the detected object can be obtained.

From the application of biological anti-counterfeiting, the first characteristic light is used to measure the reflection and absorption characteristics of different frequency wavelengths on the surface of the object, the second characteristic light is used to measure the spatial structure of the object surface, and the third characteristic light is used to measure the material of the surface of the object. effect on light polarization. The combination of these three kinds of light information can be used to distinguish the skin surface of real creatures from various simulated materials, so as to realize the function of biological anti-counterfeiting.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as It is 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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