Biometric detection device, electronic device and biometric detection method

Abstract

The present invention relates to a biometric detection device, an electronic device and a biometric detection method, wherein the biometric detection device comprises an optical structure, comprising a structured light-transmitting layer, wherein the structured light-transmitting layer comprises at least two light-transmitting areas, respectively used to transmit different characteristic lights, and the different characteristic lights are used to characterize different characteristics of an object, wherein at least a first characteristic light is included, which is used to characterize the biometric characteristics of the object; a sensing structure, located below the optical structure, used to receive a light signal transmitted through the optical structure and generate a corresponding optical sensing signal, and to process the optical sensing signal to obtain a characteristic detection signal corresponding to the characteristic of the object to be detected.

Description

Technical Field

[0001] The present invention relates to the field of sensing technology, and in particular to a biometric detection device, an electronic device and a biometric detection method. Background Art

[0002] As the intelligence of terminal electronic products continues to increase, portable mobile devices including mobile phones and wearable devices, as well as information systems such as various databases, increasingly use user authentication mechanisms to authorize or protect access to personal information data.

[0003] Secure access to a device can be achieved in different ways, one of the most common being using a user password. However, a user password can be easily obtained or cracked, and the user needs to remember the password. Once the password is forgotten, the user needs to perform some password recovery process to obtain authentication, or use other methods to regain access to the device. Such a cumbersome operation process brings a lot of inconvenience to the user's actual use process.

[0004] Another way is to use personal fingerprint recognition 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 to approach full screens and thinness. Full screens are equipped with under-screen biometric detection and identification modules. This perfect design of full screen effect that does not affect the appearance or user experience has become the research focus of major mobile phone manufacturers. Send or pass the detection beam through the display screen for biometric detection. The light intensity of the detection beam passing through the screen will directly affect the detection and identification of the biometric identification by the biometric detection and identification module; some equipment manufacturers provide solutions for placing a backlight module under the screen and opening a hole in the entire display screen, or use a backlight source and a backlight module containing an optical film layer to convert the wavelength of a backlight beam of a specific wavelength, and also diffuse the backlight beam after wavelength conversion, and mix the backlight beams of different wavelengths into white light to provide to the display panel for transmission of the detection beam. The former solution is not only complex in process, but also requires the opening of the screen and backlight module, resulting in poor overall display effect of the screen. For the latter solution, the product structure design is more complicated and the selection of the light beam emitted by the backlight source needs to be strictly controlled.

[0005] How to simplify the structure of the under-screen detection device is a problem that needs to be solved urgently. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a biological detection device, an electronic device and a biological characteristic detection method, which simplifies the structure of the detection device.

[0007] In order to solve the above problems, the present invention provides a biometric detection device, including: an optical structure, including a structured light-transmitting layer, the structured light-transmitting layer including at least two light-transmitting areas, respectively used to transmit different characteristic lights, and the different characteristic lights are used to characterize different characteristics of the object, wherein at least a first characteristic light is included, which is used to characterize the biometric characteristics of the object; a sensing structure, located below the optical structure, for receiving a light signal transmitted through the optical structure and generating a corresponding optical sensing signal, and processing the optical sensing signal to obtain a feature detection signal corresponding to the characteristic of the object to be measured.

[0008] Optionally, the characteristic detection signal characterizes at least one optical parameter of the characteristic light.

[0009] Optionally, the optical parameter includes at least one of light intensity or polarization.

[0010] 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 polarizers with different polarization angles.

[0011] Optionally, a second characteristic light is also included to characterize the surface structural features of the object.

[0012] Optionally, the wavelength range of the first characteristic light covers wavelengths of light waves that can penetrate a biological body; and the wavelength range of the second characteristic light covers wavelengths that can be at least partially reflected by the object being measured.

[0013] The technical solution of the present invention also provides an electronic device capable of performing biometric detection, comprising: a light-transmissive contact layer; a biometric detection device as described in any of the above items, located inside the electronic device and installed below the contact layer, and the optical structure of the biometric detection device is arranged toward the contact layer.

[0014] Optionally, it also includes: an identification module, connected to the biometric detection device, used to obtain feature information based on a feature detection signal obtained by the biometric detection device, and determine whether the feature information is within a set biometric range.

[0015] Optionally, the characteristic information is the light intensity ratio of two characteristic lights.

[0016] Optionally, a backlight 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 source or the self-luminous layer is used as structural detection light during biological detection to detect surface structural features of objects.

[0017] Optionally, the recognition module is further used to obtain characteristic information and identify the structural features of the surface of the object under test based on a characteristic detection signal generated by a second characteristic light that characterizes the structural features.

[0018] Optionally, it also includes: an auxiliary light source and a control module; the auxiliary light source is used to emit biological detection light, in which at least part of the light waves are first characteristic lights used to characterize biological characteristics of an object; the control module is connected to the auxiliary light source, and when performing biological detection, the control module is used to control the auxiliary light source to emit biological detection light.

[0019] The technical solution of the present invention also provides a biometric detection method, comprising: irradiating an object to be detected with detection light, wherein the detection light at least includes biological detection light; receiving at least two characteristic lights generated after the detection light irradiates the object to be detected in at least two light-transmitting areas respectively, and generating corresponding optical sensing signals, wherein different characteristic lights are used to characterize different characteristics of the object, wherein at least a first characteristic light is included, which is used to characterize the biological characteristics of the object; processing the optical sensing signal to obtain a characteristic detection signal corresponding to the characteristic of the object to be detected.

[0020] Optionally, the characteristic detection signal characterizes at least one optical parameter of the characteristic light.

[0021] Optionally, the optical parameter includes at least one of light intensity or polarization.

[0022] Optionally, it is characterized in that it also includes a second characteristic light for characterizing the surface structural characteristics of the object.

[0023] Optionally, the wavelength range of the first characteristic light covers the wavelength of light waves that can penetrate a biological body; the detection light also includes structured detection light, and the wavelength range of the second characteristic light covers the wavelength of the structured detection light that can be at least partially reflected by the object being detected.

[0024] Optionally, it includes providing an electronic device having a light-transmissive contact layer; the structured detection light is emitted by a backlight source disposed below the contact layer inside the electronic device, or is emitted by the contact layer itself.

[0025] Optionally, the method further includes acquiring feature information according to the feature detection signal, and determining whether the feature information is within a set biometric feature range.

[0026] Optionally, the characteristic information is the light intensity ratio of different characteristic lights.

[0027] Optionally, the method further includes: identifying structural features of the surface of the object to be measured based on a feature detection signal generated by the second feature light.

[0028] Optionally, the biological detection light includes a portion of the ambient light and / or light in a specific wavelength range generated by an auxiliary detection light source.

[0029] In the biometric detection device of the present invention, characteristic light of different wavelength ranges is received through a structured light-transmitting layer. Since the first characteristic light is used to characterize the biometric feature, during the detection process of the biometric detection device, it is possible to determine whether the object being detected is a biological body based on the characteristic detection signal of the received first characteristic light, thereby realizing the identification of deceptive devices. Furthermore, through the characteristic detection signal of the second characteristic light or more characteristic lights of different wavelengths or characteristics, the surface structure or other aspects of the object being detected can be detected. The structure of the entire biometric detection device is simple, and the detection of multiple aspects of the features of the object being detected can be realized only by setting more than two light-transmitting areas of different wavelengths in the structured light-transmitting layer, thereby improving the reliability of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of a biometric detection device according to a specific embodiment of the present invention;

[0031] Figure 2 A schematic top view of a structured light-transmitting layer of a biometric feature detection device according to a specific embodiment of the present invention;

[0032] Figure 3 A schematic top view of a structured light-transmitting layer of a biometric feature detection device according to a specific embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the structure of an electronic device according to a specific embodiment of the present invention;

[0034] Figure 5 A schematic diagram of fingerprint detection performed by an electronic device according to a specific embodiment of the present invention;

[0035] Figure 6 It is a schematic structural diagram of an electronic device according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0036] The specific implementation modes of the biometric detection device, electronic device and biometric detection method provided by the present invention are described in detail below with reference to the accompanying drawings.

[0037] Please refer to Figure 1 , which is a schematic structural diagram of a biometric detection device according to a specific embodiment of the present invention.

[0038] The biometric feature detection device includes: an optical structure 120 and a sensing structure 110 .

[0039] The optical structure 120 is used to focus and filter the light signal, so that the light waves that meet the requirements can pass through the optical structure 120 to reach the sensing structure 110; the sensing structure 110 is located below the optical structure 120, and is used to receive the light signal that passes 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 the feature of the object to be measured, thereby realizing the detection of biological features.

[0040] Specifically, the optical structure 120 includes a structured light-transmitting layer, and the structured light-transmitting layer includes at least two light-transmitting regions, which are respectively used to transmit characteristic lights of different wavelength ranges, and different characteristic lights are used to characterize different characteristics of an object, wherein at least a first characteristic light is included, which is 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, etc.

[0041] 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 substrate 122 can be a transparent substrate such as a glass substrate, a PMMA substrate, etc. 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 in the wavelength range of a1 to a2, and the second light-transmitting area 1232 is used to transmit the second characteristic light in the wavelength range of b1 to b2. After the incident light passes through the structured light-transmitting layer 123, it can only transmit light in the wavelength bands of a1 to a2 and b1 to b2, and transmits in different areas respectively.

[0042] Please refer to Figure 2 , 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 .

[0043] In this specific implementation, the biometric detection device is used for under-screen fingerprint recognition. The first light-transmitting area 1231 is used to transmit a first characteristic light that can characterize the biometric characteristics of the object being detected, and based on the first characteristic light, it is possible to identify whether the object being detected is a biological body or a counterfeit mold or device; the second light-transmitting area 1232 is used to transmit a surface structural feature that can characterize the object, and based on the second characteristic light, it is possible to identify the texture features of the surface of the object being detected, such as the fingerprint pattern on the surface of the finger, for fingerprint recognition.

[0044] For the application scenario of fingerprint recognition, the first light-transmitting area 1231 and the second light-transmitting area 1232 are symmetrically arranged about the symmetry axis of the structured light-transmitting layer 123, and the area of ​​the first light-transmitting area 1231 is smaller than the area of ​​the second light-transmitting area 1232, so that more second characteristic light can pass through the structured light-transmitting layer 123 and be received by the sensing structure, thereby making it easier to achieve a more comprehensive recognition of the fingerprint pattern; and the first characteristic light is only used to determine whether the object being measured is a real human finger, therefore, the area of ​​the first light-transmitting area 1231 is relatively small.

[0045] Please refer to Figure 3 , is a schematic diagram of the distribution of the first light-transmitting region 1231a and the second light-transmitting region 1232a in the structured light-transmitting layer in another specific implementation.

[0046] In other specific embodiments, a structured light-transmitting layer having two or more light-transmitting areas may be reasonably set according to the characteristics of the target detection object of the biometric detection device. Those skilled in the art may reasonably set the number, area and distribution position of the light-transmitting areas according to needs.

[0047] In another specific embodiment, the structured light-transmitting layer includes three light-transmitting areas, which are respectively used to transmit a first characteristic light, a second characteristic light, and a third characteristic light, wherein the first characteristic light is used to characterize biological characteristics, the second characteristic light is used to characterize the surface structural characteristics of an object, and the third characteristic light is used to characterize polarized light in a specific 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 the object surface to wavelengths of different frequencies, 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 influence of the material of the object surface on the polarization angle of light. These three types of light information can be combined to distinguish between the skin surface of a real organism and various simulated materials, thereby realizing the function of biological anti-counterfeiting.

[0048] The structured light-transmitting layer 123 may include filters corresponding to different wavelength ranges distributed in different regions. For example, filters corresponding to the wavelength range a1-a2 are used in the first light-transmitting region 1231 , and filters corresponding to the wavelength range b1-b2 are used in the second light-transmitting region 1232 .

[0049] In other embodiments, the structured light-transmitting layer 123 may also be a light-transmitting film including two or more layers stacked together and having different wavelength transmittances, and different light-transmitting areas may be formed by performing doping or other treatments on each light-transmitting film layer at different positions, changing the atomic arrangement structure in the film layer, etc.

[0050] In other embodiments, the structured light-transmitting layer 123 may further include polarizers distributed in different regions corresponding to different polarization angles, so as to form light-transmitting regions corresponding to different polarization angles.

[0051] The optical layer 124 in the optical structure 120 may be a microlens layer for focusing incident light; in other specific embodiments, the optical layer 124 may also be other optical element layers, for example, the optical layer 124 has arrayed small holes, and uses the principle of small hole imaging to focus the incident light, etc. The optical layer 124 may also include other optical structures such as gratings and apertures.

[0052] In this specific implementation, the structured light-transmitting layer 123 is located below the optical layer 124 . In other specific implementations, the structured light-transmitting layer 123 may also be formed above the optical layer 124 .

[0053] The sensing structure 110 is located below the optical structure 120 , and the sensing structure 110 and the optical structure 120 are fixed via an adhesive layer 130 .

[0054] The sensing structure 110 includes a substrate 111 and a sensing array 112 formed on the surface of the substrate 111. The sensing array 112 includes a plurality of sensing units distributed in an array. The sensing units may be CMOS or CCD image sensing units, which are used to receive light signals and output corresponding optical sensing signals, such as converting incident light signals into electrical signals. A logic processing unit may also be formed in the substrate 111, which is used 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 to obtain feature detection signals corresponding to the features of the object being measured.

[0055] Different light-transmitting areas in the structured light-transmitting layer 123 correspond to different positions in the sensor array 112 in terms of physical positions, so that the sensing units in the corresponding areas in the sensor array 112 receive characteristic light in the corresponding wavelength range, thereby obtaining detection signals of different characteristic lights. 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 feature of the object, and the detection signal of the second characteristic light corresponds to the surface structure feature of the object.

[0056] In this specific embodiment, the biometric detection device is used for fingerprint detection, and the first characteristic light can be red light or near-infrared light with a wavelength range of more than 600nm, which exists in the ambient light and can penetrate the finger. If the object to be detected is a real human finger, the biometric detection device can receive the first characteristic light; if the object to be detected is a non-biological object such as a simulation device or a model, the first characteristic light cannot penetrate, so the biometric detection device will not be able to receive the first characteristic light, so that it can be identified 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 of some bands. The wavelength range of the first characteristic light can be set to be consistent with the wavelength of the transmitted light wave in the external light that can penetrate the organism, greater than the wavelength range of the transmitted light wave, or less than the wavelength range of the transmitted light wave, and only the characteristic detection signal of part of the transmitted light wave is obtained. In a specific embodiment, the wavelength range of the first characteristic light can be 600nm to 1100nm.

[0057] The second characteristic light can be ordinary visible light, covering at least part of the wavelength that can be reflected by the object being measured. For example, in the case of under-screen fingerprint recognition, the second characteristic light can be the white light emitted by the under-screen backlight source or the self-luminescence 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 characteristic detection signal of the second characteristic light can characterize the texture features of the fingerprint surface of the finger, thereby realizing fingerprint recognition. Specifically, the characteristic detection signal of the second characteristic light includes the detection signal output by each sensor unit in the area of ​​the sensor array 112 that receives the second characteristic light. For example, when the characteristic detection signal is a digital signal, 1 indicates that the light intensity is strong, corresponding to the ridges; 0 indicates that the light intensity is low, corresponding to the valleys; since the texture distribution of the fingerprint presents a certain distribution, the fingerprint can be detected by the characteristic detection signal output by the sensor unit at each position.

[0058] The characteristic detection signal includes at least one optical parameter of the characteristic light. In this specific implementation, the characteristic detection signal represents the light intensity of the characteristic light. In other specific implementations, the optical parameter may be at least one of optical characteristics such as light intensity or polarization.

[0059] The polarization information can be obtained by using polarized light coating to filter polarized light in a certain direction, thereby obtaining polarization information of a specific area. The light intensity information can be obtained by photoelectric conversion of the sensor pixels below, and the number of electrons obtained by the conversion is used to obtain the light intensity information.

[0060] In a specific embodiment of the present invention, since the first characteristic light is used to characterize the biological characteristics, during the detection process of the biological characteristic detection device, it is possible to determine whether the object to be detected is a biological body according to the characteristic detection signal of the received first characteristic light, thereby realizing the identification of the deception device. Moreover, even if they are the same biological body, the characteristic detection signals of the first characteristic light of different biological bodies may be different. For example, the different fat and muscle ratios of fingers of different human bodies lead to different transmission characteristics of the first characteristic light, which can also lead to different characteristic detection signals of the detected first characteristic light. Therefore, the identification of the biological body can be realized according to whether the characteristic detection signal of the first characteristic light of the object to be detected is within the set biological characteristic range; and on this basis, the identification of the user's identity can be realized. Furthermore, through the characteristic detection signal of the second characteristic light or more characteristic lights of different bands or characteristic lights of different characteristics of the biological body, the surface structure or material of the object to be detected and other aspects of the characteristic detection are realized. The structure of the entire biological characteristic detection device is simple, and the detection of multiple aspects of the characteristics of the object to be detected is realized only by setting more than two light-transmitting areas of different bands in the structured light-transmitting layer, thereby improving the reliability of the detection.

[0061] The technical solution of the present invention also provides an electronic device using the above-mentioned biometric detection device. The electronic device can be a mobile phone, a tablet computer, a laptop computer or other electronic device.

[0062] Please refer to Figure 4 The electronic device includes a light-transmissive contact layer 400 as a detection window; the biometric detection device is located inside the electronic device and installed below the contact layer, and the optical structure 120 of the biometric detection device is arranged toward the contact layer 400, so that the light signal incident through the contact layer 400 can irradiate the optical structure 120.

[0063] 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 screens; the screen may also be a self-luminous screen, such as an OLED screen. For a non-self-luminous display screen, a backlight source is further provided inside the electronic device as a detection light source; for a self-luminous screen, the light emitted by the screen may be used as a detection light source.

[0064] Please refer to Figure 5 , which is a schematic diagram of fingerprint detection by an electronic device.

[0065] The backlight source of the electronic device or the light emitted by the self-luminous screen is used as the structural detection light during biological detection to detect the surface structural features of the object. The characteristic detection light passes through the contact layer 400, irradiates the finger surface, is reflected by the finger surface, and is received by the biological feature detection device through the contact layer 400.

[0066] The ambient light is used as the biological detection light, wherein light of a partial wavelength band in the biological detection light can penetrate the finger and further pass through the contact layer 400 .

[0067] The biometric detection device can receive at least part of the structure detection light as the first characteristic light through the optical structure 120, and receive light in the ambient light that can penetrate all or part of the wavelength band of the finger as the second characteristic light, and obtain characteristic detection signals of the first characteristic light and the second characteristic light.

[0068] Please refer to Figure 6 , is a schematic structural diagram of an electronic device according to a specific embodiment of the present invention.

[0069] The electronic device includes a biometric detection device 601 , an identification module 602 , a control module 603 and a light source module 604 .

[0070] The light source module 604 may be a backlight source or a luminous contact layer below the contact layer, and is used to emit detection light. The control module 603 is used to control the light source module 604 to emit detection light when performing biological feature detection. The light wave range emitted by the detection light can be set according to demand, and can be consistent with the screen light when the electronic device is used, or can be a separately modulated band.

[0071] The identification module 602 is connected to the biometric detection device 601 and is used 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.

[0072] In a specific embodiment, the identification module 602 is used to obtain characteristic information based on the characteristic detection signal of the first characteristic light obtained by the biometric detection device 601. The characteristic information can 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 a set threshold. If it is greater than the set threshold, there is enough first characteristic light to penetrate the object to be detected, and the object to be detected can be considered to be a biological 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 almost cannot penetrate the object to be detected, and the object to be detected can be considered to be a non-biological body, thereby avoiding deception of simulation equipment during the biological detection process. Different biometric ranges can also be set for different users' biometrics, and the characteristic information can be matched with the biometric range to assist in the identification of the user's identity.

[0073] In another specific embodiment, the ratio of the characteristic detection signals of two characteristic lights obtained by the biometric detection device 601 can be used as characteristic information. For example, the light intensity ratio of the first characteristic light and the second characteristic light can be used as characteristic information. Using the light intensity ratio as characteristic information can reduce systematic errors and improve accuracy.

[0074] Furthermore, the identification module 602 is also used to obtain characteristic information to identify other characteristics of the object under test based on characteristic detection signals of other characteristic lights. For example, the structural characteristics of the surface of the object under test can be identified based on the characteristic detection signal generated by the second characteristic light used to characterize the structural characteristics. In a specific embodiment, the identification module 602 can obtain characteristic information corresponding to the texture characteristics of the finger surface based on the characteristic detection signal of the second characteristic light, thereby identifying the fingerprint pattern of the finger and realizing fingerprint recognition. The material properties of the photographed object can also be detected based on the third characteristic light that characterizes 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 the object surface for different frequency wavelengths, 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 influence of the material of the object surface on the polarization of light. These three types of light information can be combined to distinguish the skin surface of real organisms from various simulated materials, thereby realizing the function of biological anti-counterfeiting.

[0075] The electronic device of the present invention can perform biometric identification through the first characteristic light, thereby improving the accuracy of biometric feature detection, avoiding device deception, and improving the accuracy of biometric feature identification.

[0076] In other specific embodiments, the light source module 604 may also include an auxiliary light source for emitting biological detection light, in which at least part of the light waves are first characteristic lights for characterizing biological characteristics of an object; the control module 603 is connected to the auxiliary light source, and when performing biological detection, the control module is used to control the auxiliary light source to emit biological detection light. In the case of using ambient light as biological detection light, the detection accuracy is easily affected by the intensity of the external ambient light. By separately setting an auxiliary light source, the biological detection light can be supplemented when the ambient light is weak, thereby improving the accuracy of biological characteristic detection. The electronic device may also have an ambient light detection module, and the control module 603 can selectively turn on the auxiliary light source according to the intensity of the ambient light, or directly turn on the auxiliary light source when biological characteristic detection is required.

[0077] A specific embodiment of the present invention also provides a biometric detection method.

[0078] The biometric detection method comprises the following steps:

[0079] Step 1: irradiate the object to be detected with detection light, wherein the detection light at least includes biological detection light.

[0080] The biological detection light is used to detect whether the detected object is a biological body, or to detect its characteristics related to biological bodies. For example, a light wave of a specific wavelength that can penetrate a finger can be used as a biological detection light to detect whether the detected object is a real finger or a spoofing device. In some specific embodiments, the biological detection light includes a part of the ambient light and / or light of a specific wavelength range generated by an auxiliary detection light source.

[0081] Step 2: Receive at least two characteristic lights generated by the detection light irradiating the object to be detected in at least two light-transmitting areas respectively, and generate corresponding optical sensing signals, where different characteristic lights are used to characterize different characteristics of the object, including at least the first characteristic light, which is used to characterize the biological characteristics of the object.

[0082] The first characteristic light covers the light band in the biological detection light that can characterize biological characteristics. Other characteristic lights can be used to characterize other characteristics of the object being detected, such as temperature, surface structure, etc. In a specific embodiment, the method is used to detect fingerprints, and the first characteristic light can be used to characterize the transmittance of the organism to partial bands of red light and infrared light. The band range of the first characteristic light can be set to be consistent with the band of the transmitted light wave in the external light that can penetrate the organism, greater than the wavelength range of the transmitted light wave, or less than the wavelength range of the transmitted light wave, and only obtain the characteristic detection signal of part of the transmitted light wave. In a specific embodiment, the wavelength range of the first characteristic light can be 600nm~1100nm.

[0083] In some specific embodiments, the two light-transmitting areas also include at least one light-transmitting area for transmitting a second characteristic light, and the second characteristic light is used to characterize the surface structural features of the object. Correspondingly, the detection light also 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 being measured. For example, in under-screen fingerprint recognition, the second characteristic light can be the reflected light after reflection of the white light emitted by the under-screen backlight source or the self-luminescence of the screen. Since the reflected light of the ridges and valleys of the fingerprint is different, the reflected light carries the fingerprint information of the user, so that the characteristic detection signal of the second characteristic light can characterize the texture features of the fingerprint surface of the finger, thereby realizing fingerprint recognition.

[0084] In some specific embodiments, another light-transmitting area is further included for transmitting a third characteristic light, wherein the third characteristic light is used to characterize polarized light in a specific direction, so as to characterize the material property of the photographed object.

[0085] Step 3: Process the optical sensing signal to obtain a feature detection signal corresponding to the feature of the object being measured.

[0086] The characteristic detection signal represents at least one optical parameter of the characteristic light. The optical parameter may include at least one of light intensity or polarization.

[0087] The biometric feature detection method further includes: acquiring feature information according to the feature detection signal, and determining whether the feature information is within a set biometric feature range.

[0088] In a specific embodiment, characteristic information is obtained based on the characteristic detection signal of the acquired first characteristic light. The characteristic information may be the light intensity of the first characteristic light. It is determined whether the light intensity of the first characteristic light is greater than or equal to a set threshold. If it is greater than the set threshold, there is enough first characteristic light to penetrate the object under test, and the object under test can be considered to be a biological 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 almost cannot penetrate the object under test, and the object under test can be considered to be a non-biological body, thereby avoiding deception of simulation equipment during biological detection. Different biometric ranges can also be set for different users' biometrics, and the characteristic information can be matched with the biometric range to assist in the identification of the user's identity.

[0089] In another specific embodiment, the ratio of the characteristic detection signals of two of the characteristic lights obtained can be used as characteristic information. For example, the light intensity ratio of the first characteristic light and the second characteristic light can be used as characteristic information. Using the light intensity ratio as characteristic information can reduce systematic errors and improve accuracy.

[0090] Furthermore, characteristic information can be obtained based on characteristic detection signals of other characteristic lights to identify other characteristics of the object under test. For example, the structural characteristics of the surface of the object under test can be identified based on the characteristic detection signal generated by the second characteristic light used to characterize the structural characteristics. In a specific embodiment, characteristic information corresponding to the texture characteristics of the finger surface can be obtained based on the characteristic detection signal of the second characteristic light, so as to identify the fingerprint pattern of the finger and realize fingerprint recognition. In a specific embodiment, the material characteristics of the object under test can also be obtained based on the characteristic detection signal of the third characteristic light to characterize the polarization information of the light.

[0091] In terms of biological anti-counterfeiting applications, the first characteristic light is used to measure the reflection and absorption characteristics of the object surface to different frequency wavelengths, 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 influence of the material on the object surface on the polarization of light. These three types of light information can be combined to distinguish the skin surface of real organisms from various simulated materials, thereby realizing the function of biological anti-counterfeiting.

[0092] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A biometric detection device, characterized in that: include: The optical structure includes a structured light-transmitting layer, wherein the structured light-transmitting layer includes at least two light-transmitting areas, each of which is used to transmit different characteristic lights, and the different characteristic lights are used to characterize different characteristics of an object, wherein at least a first characteristic light is included, which is used to characterize a biometric characteristic of the object, and the wavelength range of the first characteristic light covers the wavelength of light waves that can pass through the object, and the first characteristic light can pass through the object from a side of the object away from the biometric characteristic detection device and then enter the structured light-transmitting layer; The sensing structure is located below the optical structure and is used to receive the light signal transmitted through the optical structure and generate a corresponding optical sensing signal, and to process the optical sensing signal to obtain a feature detection signal corresponding to the feature of the object being measured.

2. The biometric detection device according to claim 1, characterized in that: The characteristic detection signal represents at least one optical parameter of the characteristic light.

3. The biometric detection device according to claim 2, characterized in that: The optical parameter includes at least one of light intensity or polarization.

4. The biometric detection device according to claim 1, characterized in that: 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 polarizers with different polarization angles.

5. The biometric detection device according to claim 1, characterized in that: It also includes a second characteristic light for characterizing the surface structural features of the object.

6. The biometric detection device according to claim 5, characterized in that: The wavelength range of the second characteristic light covers at least a portion of wavelengths that can be reflected by the object to be measured.

7. An electronic device capable of performing biometric detection, characterized in that: include: A light-transmissive contact layer; a biometric detection device as claimed in any one of claims 1 to 6, located inside the electronic device and installed below the contact layer, wherein the optical structure of the biometric detection device is arranged toward the contact layer.

8. The electronic device according to claim 7, characterized in that: Also includes: The identification module is connected to the biometric detection device and is used to obtain feature information according to the feature detection signal obtained by the biometric detection device, and to determine whether the feature information is within a set biometric range.

9. The electronic device according to claim 8, characterized in that: The characteristic information is the light intensity ratio of the two characteristic lights.

10. The electronic device according to claim 7, characterized in that: A backlight source is also arranged under the contact layer of the electronic device, or the contact layer is a self-luminous layer, and the light emitted by the backlight source or the self-luminous layer is used as the structural detection light during biological detection to detect the surface structural features of the object.

11. The electronic device according to claim 8, characterized in that: The recognition module is also used to obtain feature information and recognize the structural features of the surface of the object to be measured based on a feature detection signal generated by the second feature light that represents the structural features.

12. The electronic device according to claim 10, characterized in that: Also includes: An auxiliary light source and a control module; the auxiliary light source is used to emit biological detection light, in which at least part of the light waves are first characteristic lights used to characterize biological characteristics of an object; The control module is connected to the auxiliary light source, and is used to control the auxiliary light source to emit biological detection light when performing biological detection.

13. A biometric detection method, characterized in that: include: The object to be detected is illuminated by detection light, wherein the detection light at least includes biological detection light, and the biological detection light can pass through the object to be detected from a side of the object to be detected away from the biological characteristic detection device and then enter the structured light-transmitting layer; at least two different characteristic lights generated after the detection light is irradiated on the object to be detected are respectively received in at least two light-transmitting areas of the structured light-transmitting layer, and corresponding optical sensing signals are generated, wherein different characteristic lights are used to characterize different characteristics of the object, wherein at least a first characteristic light is included, which is used to characterize the biological characteristics of the object, and the wavelength range of the first characteristic light covers the wavelength of light waves that can pass through biological bodies; The optical sensing signal is processed to obtain a feature detection signal corresponding to the feature of the object being measured.

14. The biometric detection method according to claim 13, characterized in that: The characteristic detection signal represents at least one optical parameter of the characteristic light.

15. The biometric detection method according to claim 14, characterized in that: The optical parameter includes at least one of light intensity or polarization.

16. The biometric detection method according to claim 13, characterized in that: It is characterized in that It also includes a second characteristic light for characterizing the surface structural features of the object.

17. The biometric detection method according to claim 16, characterized in that: The detection light further includes structured detection light, and the wavelength range of the second characteristic light covers at least a portion of the wavelength of the structured detection light that can be reflected by the object to be detected.

18. The biometric detection method according to claim 17, characterized in that: The invention comprises providing an electronic device with a light-transmissive contact layer; the structured detection light is emitted by a backlight source arranged below the contact layer inside the electronic device, or by the contact layer itself.

19. The biometric detection method according to claim 13, characterized in that: The method also includes acquiring feature information according to the feature detection signal, and determining whether the feature information is within a set biometric feature range.

20. The biometric detection method according to claim 19, characterized in that: The characteristic information is the light intensity ratio of different characteristic lights.

21. The biometric detection method according to claim 16, characterized in that: Also includes: The structural features of the surface of the object to be measured are identified according to the feature detection signal generated by the second feature light.

22. The biometric detection method according to claim 13, characterized in that: The biological detection light includes a portion of the ambient light and / or light in a specific wavelength range generated by an auxiliary detection light source.

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