WO2022221998A1

WO2022221998A1 - Biometric detection apparatus and wearable device

Info

Publication number: WO2022221998A1
Application number: PCT/CN2021/088184
Authority: WO
Inventors: 蒋鹏
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-10-27

Abstract

Provided in the present application are a biometric detection apparatus and a wearable device. The biometric detection apparatus comprises: one or more light-emitting devices, wherein the light emitting devices are used for generating light beams; a light homogenization layer, wherein the light homogenization layer is disposed above the light-emitting devices, such that the light beams of the light-emitting devices diverge into human skin after passing through the light homogenization layer, and propagate within the human skin, the haze of the light homogenization layer is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light-emitting devices is greater than or equal to 40%; and one or more photodiodes, wherein the photodiodes are used for receiving the light beams which have propagated within the human skin, and converting received optical signals of the light beams into heart rate and/or blood oxygen measurement signals. By means of the biometric detection apparatus and the wearable device of the present application, light-emitting devices can be prevented from being seen by the human eyes, thereby improving the appearance of products.

Description

Biometric detection devices and wearable devices

technical field

The embodiments of the present application relate to the field of electronic technologies, and in particular, to a biometric detection device and a wearable device.

Background technique

In an existing biometric detection device, such as a wristband, the wristband includes a bare light-emitting diode (Light Emitting Diode, LED) and a bare photodiode (Photo Diode, PD) solution, and a transparent material is provided above the LED and PD, This makes it easy for the human eye to see the lower device, which affects the appearance of the bracelet or watch.

SUMMARY OF THE INVENTION

In view of this, the present application provides a biometric detection device and a wearable device, which are beneficial to prevent the human eye from directly seeing the light-emitting device and improve the appearance of the product.

In a first aspect, a biometric detection device is provided, comprising: one or more light emitting devices, the light emitting devices are used to generate light beams; The light beam of the light-emitting device is scattered into the human skin after passing through the uniform light layer, and spreads in the human skin, the haze of the uniform light layer is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%; one or more photodiodes for receiving light beams after propagating within said human skin and converting the received light signals of said light beams into electrical signals for biometric detection; Signal.

In the biometric detection device of the present application, the haze of the homogenizing layer is set to be greater than or equal to 70% and the transmittance is greater than or equal to 40%, so that the light beam emitted by the light-emitting device is scattered into the human skin after passing through the homogenizing layer, and can be To a certain extent, it prevents the human eye from directly seeing the light-emitting device, and improves the appearance of the product.

In a possible implementation manner, the vertical distance between the light emitting device and the light leveling layer is 0.1-1 mm.

By setting the vertical distance between the light-emitting device and the uniform light layer to be 0.1-1 mm, the performance of biological feature detection is improved.

In a possible implementation manner, the center distance between the light emitting device and the photodiode is between 3-10 mm.

In a possible implementation manner, the light leveling layer includes a light leveling film and a transparent cover plate, and the light leveling film is disposed on the lower surface of the transparent cover plate.

In a possible implementation manner, the haze of the homogenizing layer is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%, specifically: the haze of the homogenizing film is greater than or equal to 40%. It is equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%.

In a possible implementation manner, the light-diffusing layer includes a non-transparent cover plate, the haze of the non-transparent cover plate is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%.

The design of the non-transparent cover plate not only improves the accuracy of biometric detection in a moving state, but also saves the cost of the uniform light film.

In a possible implementation manner, the biometric detection device further includes: a threaded collimating lens, the threaded collimating lens is disposed above the one or more photodiodes, and a half of the threaded collimating lens is located above the one or more photodiodes. The power receiving angle is less than or equal to 30°, and/or, greater than or equal to -30°.

By setting the half-power light-receiving angle of the threaded collimating lens to be less than or equal to 30°, and/or, greater than or equal to -30°, the accuracy of biometric detection is improved.

In a possible implementation manner, the vertical distance between the threaded collimating lens and the photodiode is between 0.1-1 mm.

In a possible implementation manner, the biometric detection device further includes: a micro-collimating lens array, the focal length of the micro-collimating lens is located on the upper surface of the photodiode; a micro-aperture diaphragm array, the photoelectric The micro-aperture diaphragm array is disposed at the focal length of the diode, and the half-power light-receiving angle of the micro-aperture diaphragm array is less than or equal to 30°, and/or, greater than or equal to -30°.

By arranging the micro-collimating lens array and the micro-aperture diaphragm array, the light-receiving angle on the photodiode is less than or equal to 30°, and/or greater than or equal to -30°, which improves the accuracy of biometric detection.

In a possible implementation manner, a homogenizing film is arranged above the photodiode, and the half-power light receiving angle of the homogenizing film is less than or equal to 30°, and/or, greater than or equal to -30°, which improves the Accuracy of biometric detection.

In a possible implementation manner, the biometric detection device further includes: a transparent cover plate, and the transparent cover plate is arranged above the photodiode.

In a possible implementation manner, the biometric detection device further includes: a white ink layer, the white ink layer and the light-emitting device are arranged on a PCB board, and the white ink layer is used to The light beam of the uniform layer is diffusely reflected.

In a possible implementation manner, a black light-blocking layer is disposed between the light-emitting device and the photodiode to block stray light.

In a second aspect, a wearable device is provided, including the first aspect and the biometric detection apparatus in any implementation manner of the first aspect, and a display, where the display is configured to display the biometrics detected by the biometric detection apparatus information.

In the wearable device of the present application, by setting the haze of the homogenizing layer in the biometric detection device to be greater than or equal to 70% and the transmittance to be greater than or equal to 40%, the light beam emitted by the light-emitting device is scattered after passing through the homogenizing layer. It can prevent the human eye from directly seeing the light-emitting device to a certain extent, and improve the appearance of the product.

Description of drawings

FIG. 1 is a schematic diagram of a biometric detection device according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a biometric detection device according to another embodiment of the present application.

FIG. 3 is a schematic diagram of a biometric detection device including a uniform light film in an embodiment of the present application.

FIG. 4 is a schematic structural diagram of a biological feature detection apparatus according to an embodiment of the present application.

FIG. 5 is a schematic structural diagram of a biological feature detection apparatus according to another embodiment of the present application.

FIG. 6 is a schematic diagram of a light-diffusing layer in a biometric detection device according to another embodiment of the present application.

FIG. 7 is a schematic diagram of a biometric detection device including a threaded collimating lens in an embodiment of the present application.

FIG. 8 is a schematic diagram of a biometric detection device including a homogenizing film and a threaded collimating lens in an embodiment of the present application.

FIG. 9 is a schematic diagram of a biometric detection device including a non-transparent cover plate according to an embodiment of the present application.

FIG. 10 is a schematic diagram of a biometric detection device including a micro-collimating lens array according to an embodiment of the present application.

FIG. 11 is a schematic diagram of a biometric detection device including a light homogenizing film disposed above a photodiode in an embodiment of the present application.

FIG. 12 is a schematic diagram of the components of the biometric detection device in the embodiment of the present application.

FIG. 13 is a schematic diagram of components of a biometric detection device according to another embodiment of the present application.

FIG. 14 is a schematic diagram showing the relationship between the half-power light-receiving angle and the light intensity in the embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In order to prevent the human eye from seeing the devices in the biometric detection device, a threaded lens is used for dimming in the wristband or watch that detects blood oxygen and heart rate, but the light-emitting angle of the LED is too small, and the light-receiving angle of the threaded lens above the PD is too small. If it is too large, the heart rate detection will be inaccurate during exercise. Due to individual differences between LEDs and PDs, each LED and PD needs to be adapted to a suitable threaded lens. At this time, it is necessary to carry out relevant optical design for each threaded lens, resulting in increased time and cost.

To this end, the embodiments of the present application provide a biometric detection device, which can not affect the accuracy of biometric detection when the user is in a state of motion, and at the same time prevents the human eye from seeing the lower device, thereby improving the appearance of the product.

FIG. 1 shows a schematic structural diagram of a biometric detection device according to an embodiment of the present application. As shown in FIG. 1 , the biometric detection device includes:

one or more light emitting devices 101 for generating a light beam;

The uniform light layer 102 is arranged above the light emitting device 101, so that the light beam of the light emitting device 101 scatters into the human skin after passing through the uniform light layer 102, and spreads in the human skin , the haze of the uniform light layer 102 is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%;

One or more photodiodes 103, the photodiodes 103 are used for receiving the light beams after propagating in the human skin, and converting the received light signals of the light beams into electrical signals for biometric detection.

In the embodiment of the present application, the haze of the uniform light layer 102 is greater than or equal to 70% and the transmittance is greater than or equal to 40%, which can prevent the human eye from directly seeing the light-emitting device to a certain extent and improve the appearance of the product.

In the embodiment of the present application, after the light emitting device 101 generates a light beam, the light beam is scattered into the human skin through the homogenizing layer 102 and spreads in the human skin. When the human heart is pumping blood, the blood vessels will be filled with blood. tend to absorb light of specific wavelengths. Therefore, when the human heart is beating, the light beam generated by the light-emitting device 101 will be absorbed by the blood under the human skin, and then the photodiode 103 will receive the light beam propagating in the human skin, and the photodiode 103 will convert the light signal of the received light beam into For the electrical signal for biometric detection, the electrical signal detected by the biometric is a photoelectric pulse wave PPG signal, and the biometrics such as heart rate, blood oxygen, and blood pressure can be extracted by using this signal. The electrical signal detected by the biometrics is processed by a conditioning circuit and an analog-to-digital converter (ADC, Analog-to-Digital Converter) and then transmitted to the MCU to calculate the current biometrics situation, and finally use Bluetooth or wireless fidelity (Wi-Fi, Wireless Fidelity) and other wireless systems are transmitted to the terminal display, and the biometric information is displayed on the display. The light emitting device 101 may be composed of LEDs. When the biometric detection device is in blood oxygen detection, the light emitting device may include red LEDs and infrared LEDs; when the biometric detection device is in heart rate detection, the light emitting device may include green LEDs; when the biometric detection device is in heart rate and blood oxygen detection , the light-emitting devices may include red LEDs, infrared LEDs and green LEDs.

The biometric information in the embodiments of this application is illustrated by taking heart rate as an example. When the human body is in motion, the wearable device worn by the human body, such as a wristband or a watch, has a slight displacement change relative to the fixed position of the human skin. The light beam emitted by the light-emitting device enters the human skin vertically, so the angle of the light entering the human skin will change slightly under the motion state, and the propagation path of the light beam in the human skin will change, so that the measured heart rate and the actual heart rate pulse are inconsistent. The signal received by the photodiode includes not only the heart rate signal, but also the motion interference signal caused by exercise. When the signal change brought by the exercise state is stronger than the photoelectric signal of the pulse in the static state, the heart rate detection in the exercise state Accuracy is poor.

In the embodiment of the present application, the haze of the homogenizing layer 102 is greater than or equal to 70%, so that the light beam emitted by the light emitting device 103 is scattered into the human skin through the homogenizing layer 102. Effectively suppress the influence of motion interference signal, then the optical signal change caused by small displacement is weaker than the photoelectric signal of the pulse in the static state, and the dynamic heart rate performance is relatively good. The half-power light receiving angle of the photodiode 103 is as small as possible, and the dynamic heart rate performance is good. Preferably, the half-power divergence angle of the light beam of the light-emitting device passing through the uniform light layer 102 is greater than or equal to 30°, and/or, less than or equal to -30°, and the half-power light-receiving angle of the light received by the photodiode 103 is less than or equal to 30°, and/or, greater than or equal to -30°, improves the accuracy of heart rate detection.

The biometric information in the embodiments of the present application is described by taking blood oxygen as an example. The half-power divergence angle of the light beam of the light-emitting device passing through the light-diffusing layer 102 is less than or equal to 30°, and/or, greater than or equal to -30°, the photodiode 103 When the half-power receiving angle of the received light is less than or equal to 30°, and/or greater than or equal to -30°, the accuracy of blood oxygen detection is improved.

The biometric information in the embodiments of the present application is described by taking heart rate and blood oxygen as examples. The half-power divergence angle of the light beam of the light-emitting device passing through the light-dimming layer 102 is not required, and the half-power light-receiving angle of the light received by the photodiode 103 is less than or equal to 30°, and/or, greater than or equal to -30°, can improve the accuracy of heart rate and blood oxygen detection.

In the embodiment of the present application, the light-emitting device 101 and the photodiode 103 are respectively disposed on a printed circuit board (PCB, Printed Circuit Board) 106, and a transparent cover plate 105 is disposed above the photodiode 103, and the light beam emitted by the light-emitting device 103 passes through The homogenizing layer scatters into the human skin and propagates in the human skin, and the light beam propagated in the human skin passes through the transparent cover plate 105 and reaches the photodiode 103 . A black light blocking layer 104 is disposed between the light emitting device 101 and the photodiode 103 for eliminating stray light. Preferably, the center distance between the light emitting device 101 and the photodiode 103 is between 3-10 mm, so that the performance of biometric detection is better.

In this embodiment of the present application, the biometric detection device may further include white ink 107 , as shown in FIG. 2 . A layer of white ink 107 is laid on the surface of the PCB board, and the white ink 107 is located outside the light-emitting device 101 . After the light emitted by the light-emitting device 101 enters the human skin and propagates in the human skin, a part of the light beams propagated in the human skin is received by the photodiode 103 through the transparent cover 105, and the other part of the light beams propagated in the human skin is again received by the photodiode 103. After reaching the PCB board 106 through the light homogenizing film 108, the white ink 107 is used to re-reflect the light beam reaching the PCB board 106, and the re-reflected light enters the human skin again, thereby improving the utilization rate of light.

As shown in FIG. 3 , the light leveling layer in the embodiment of the present application includes, for example, a transparent cover plate 109 and a light leveling film 108 . The homogenizing film 108 is disposed above the light emitting device 101, and the vertical distance can be, for example, between 0.1-1 mm, so that the effect of biometric detection is better. The homogenizing film 108 can be disposed on the lower surface of the transparent cover plate 105, for example, it can be pasted by glue. The haze of the uniform light film 108 is greater than or equal to 70%, and the transmittance of the corresponding light emitted by the light-emitting device is greater than or equal to 40%. That is, the transmittance of the homogenizing film to the red light, infrared light and/or green light emitted by the light-emitting device is greater than or equal to 40%. This setting prevents the human eye from directly seeing the light-emitting device 101 to a certain extent, improving the performance of the light-emitting device. the appearance of the product.

In the embodiment of the present application, the transparent cover plate 109 and the transparent cover plate 105 above the photodiode 103 are made of the same material. In another embodiment of the present application, the transparent cover plate 105 can be set as a complete piece, covering the light-diffusing film 108, the black light blocking layer 104 and the photodiode 103, as shown in FIG. 4, wherein, The homogenizing film 108 and the black light blocking layer 104 are located on the lower surface of the transparent cover plate 105 . In another embodiment of the present application, the light emitting device 101 , the black light blocking layer 104 and the photodiode 106 may be located on the same PCB board 106 , as shown in FIG. 5 .

As shown in FIG. 6 , the dodging layer in another embodiment provided by the present application includes, for example, a non-transparent cover plate 110 , and the surface of the non-transparent cover plate 110 is frosted, so that the haze of the non-transparent cover plate 110 is greater than or equal to 70%, the transmittance of the corresponding light emitted by the light-emitting device is greater than or equal to 40%. In the embodiment of the present application, the frosted non-transparent cover plate 110 is provided, so that the non-transparent cover plate 110 has the function of a light-diffusing film, thereby saving the cost of the light-diffusing film and preventing the human eye from directly seeing the light-emitting device to a certain extent. , which improves the appearance of the product.

In order to improve the accuracy of heart rate detection in a state of motion, the present application provides another embodiment. As shown in FIG. 7 , the biometric detection device includes: one or more light-emitting devices 701, a uniform light layer 702, one or more A photodiode 703 and a threaded collimating lens 711. The light emitting device 701 is arranged on the PCB board 706, and the light emitting device 701 is used to generate a light beam; the light homogeneous layer 702 is arranged above the light emitting device 701, so that the light beam generated by the light emitting device 701 passes through the light homogeneous layer After 702, it scatters into the human skin and spreads in the human skin. The haze of the uniform light layer 702 is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%; one or more photodiodes 703 is arranged on the PCB board 706, and the photodiode 703 is used for receiving the light beam after propagating in the human skin, and converting the received light signal of the light beam into an electrical signal for biometric detection. The electrical signal detected by the biometrics is a photoelectric pulse wave PPG signal, which can be used to extract biometrics such as heart rate, blood oxygen, and blood pressure. A threaded collimating lens 711 is disposed above the photodiode 703 , and the threaded collimating lens 711 is used to receive the light beam propagated in the human skin, so that it reaches the photodiode 703 . The light received by the threaded collimating lens 711 is not completely vertical, and its half-power light-receiving angle is less than or equal to 30°, and/or, greater than or equal to -30°. In the moving state, the signal received by the optical receiver 703 will produce a slight inclination. The half-power light-receiving angle of the threaded collimating lens 711 is set in this way, so that the interference brought by the moving state is higher than that of the photodiode 703 in the non-collimated receiving state. The scheme is weaker, which further improves the accuracy of heart rate detection. The non-collimated receiving solution in the embodiments of the present application means that the half-power light receiving angle of the threaded collimating lens 711 is greater than 30°, and/or, less than -30°.

Optionally, the vertical distance between the threaded collimating lens 711 and the photodiode 703 can be, for example, between 0.1-1 mm, so that the effect of biometric detection is better.

In this embodiment of the present application, the biometric detection device may further include white ink 707 , as shown in FIG. 7 . A layer of white ink 707 is laid on the surface of the PCB board, and the white ink 707 is located outside the light-emitting device 701 . The light emitted by the light-emitting device 701 enters the human skin and propagates in the human skin. After a part of the light beam propagates in the human skin, the light beam is received by the photodiode 703 through the transparent cover 705, and the other part of the light beam propagates in the human skin and passes through the uniform light film again. 708 reaches the PCB board 706, and the white ink 707 is used for secondary reflection of the light beam reaching the PCB board 706, and the secondary reflected light beam reaches the human skin again, thereby improving the utilization rate of light.

In the embodiment of the present application, a black light blocking layer 704 is disposed between the light emitting device 701 and the photodiode 703 to eliminate stray light. Preferably, the center distance between the light emitting device 701 and the photodiode 703 is between 3-10 mm, so that the performance of biometric detection is better.

Optionally, the light leveling layer 702 can be, for example, a transparent cover plate 709 and a light leveling film 708, as shown in FIG. 8 . The homogenizing film 708 is disposed above the light-emitting device 701, and the distance can be, for example, between 0.1-1 mm, so that the heart rate detection effect is better. The homogenizing film 708 can be disposed on the lower surface of the transparent cover plate 709, for example, it can be pasted by glue. The haze of the uniform light film 708 is greater than or equal to 70%, and the transmittance of the corresponding light emitted by the light-emitting device is greater than or equal to 40%. This arrangement prevents the human eye from directly seeing the light-emitting device to a certain extent, thereby improving the appearance of the product. At the same time, it ensures that the light beam reaches the human skin, and improves the accuracy of heart rate detection during exercise.

Optionally, the uniform light layer 702 includes, for example, a non-transparent cover plate 710. As shown in FIG. 9, the surface of the non-transparent cover plate 710 is frosted, so that the haze of the cover non-transparent plate 710 is greater than or equal to 70%, The transmittance of light emitted by the corresponding light-emitting device is greater than or equal to 40%. The embodiment of the present application saves the cost of the homogenizing film, prevents the human eye from directly seeing the light-emitting device to a certain extent, and improves the appearance of the product.

The present application also provides another embodiment to improve the accuracy of biometric detection in a motion state. As shown in FIG. 10 , the biometric detection device includes: one or more light emitting devices 801 , a light homogenizing layer 802 , one or more photodiodes 803 , a micro-collimating lens array 812 and a micro-aperture diaphragm array 813 . The light emitting device 801 is arranged on the PCB board 806, and the light emitting device 801 is used to generate a light beam; the light emitting device 802 is arranged above the light emitting device 801, so that the light beam of the light emitting device is dispersed after passing through the light emitting device 801. It is injected into the human skin and spreads in the human skin, the haze of the uniform light layer 802 is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%; one or more photodiodes 803 are arranged on On the PCB board 806, the photodiode 803 is used for receiving the light beam propagated in the human skin, and converting the received light signal of the light beam into an electrical signal for biometric detection. The electrical signals detected by the biometrics may be electrical signals detected by heart rate and/or blood oxygen. A micro-collimating lens array 812 is arranged above the photodiode 803 , and the focal length of the micro-collimating lens array 812 is just located on the upper surface of the photodiode 803 . A micro-aperture diaphragm array 813 is provided at this focal length, and the micro-aperture diaphragm array 813 is used to limit the angle of the light beam reaching the photodiode 803, so that the angle of less than or equal to 30°, and/or, greater than or equal to -30° The light beam is received by photodiode 803 . In the moving state, the signal received by the photodiode 803 will produce a slight tilt, and the micro-collimating lens array 812 and the micro-aperture diaphragm array 813 are arranged so that the light beam entering the photodiode 803 is less than or equal to 30°, and/or , greater than or equal to -30°, which improves the accuracy of biometric detection. The non-collimated receiving solution means that the half-power light receiving angle of the micro-collimating lens array 812 and the micro-aperture diaphragm array 813 is greater than or equal to 30°, and/or, less than or equal to -30°.

In this embodiment of the present application, the biometric detection device may further include white ink 807 , as shown in FIG. 10 . A layer of white ink 807 is laid on the surface of the PCB board, and the white ink 807 is located outside the light-emitting device 801 . The light beam emitted by the light-emitting device 801 enters the human skin and propagates in the human skin. After a part of the light beam propagates in the human skin, the light beam is received by the photodiode 803 through the transparent cover 805, and the other part of the light beam reaches the PCB board 806 after propagating in the human skin. , the white ink 807 is used for secondary reflection of the light beam reaching the PCB board 806 , and the secondary reflected light enters the human skin again, thereby improving the utilization rate of light.

In this embodiment of the present application, a black light blocking layer 804 is disposed between the light emitting device 801 and the photodiode 803 to eliminate stray light. Preferably, the center distance between the light-emitting device 801 and the photodiode 803 is between 3-10mm, so that the performance of biometric detection is better.

The present application provides another embodiment, which can improve the accuracy of biometric detection. As shown in FIG. 11 , the biometric detection device includes: one or more light-emitting devices 901 , a light-diffusing layer 902 , one or more photodiodes 903 and a threaded collimating lens 911 . The light emitting device 901 is arranged on the PCB board 906, and the light emitting device 901 is used to generate a light beam; the light emitting device 902 is arranged above the light emitting device 901, so that the light beam generated by the light emitting device 901 passes through the light homogeneous layer After 902, it scatters into the human skin and spreads in the human skin, the haze of the uniform light layer 902 is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%; one or more photodiodes 903 is arranged on the PCB board 906, and the photodiode 903 is used for receiving the light beam after propagating in the human skin, and converting the received light signal of the light beam into an electrical signal for biometric detection. The electrical signal detected by the biometrics is a photoelectric pulse wave PPG signal, which can be used to extract biometrics such as heart rate, blood oxygen, and blood pressure. A homogenizing film 908 is arranged above the photodiode 903, so that the half-power light-receiving angle of the light received by the photodiode 903 is less than or equal to 30°, and/or, when it is greater than or equal to -30°, the accuracy of biometric detection is improved sex.

The biometric information in the embodiments of the present application is described by taking blood oxygen as an example, and the half-power divergence angle of the light beam of the light-emitting device passing through the light-diffusing layer 702 is less than or equal to 30°, and/or, greater than or equal to -30°, the photodiode 703 When the half-power receiving angle of the received light is less than or equal to 30°, and/or greater than or equal to -30°, the accuracy of blood oxygen detection is improved.

In the embodiment of the present application, the haze of the homogenizing layer is greater than or equal to 70%, so that the light beam emitted by the light-emitting device scatters into the human skin, and the change of the optical signal caused by the slight displacement is weaker than the photoelectric signal of the pulse in the static state. At this time, the dynamic Heart rate performance is relatively good. The receiving angle of the photodiode is as small as possible, and the dynamic heart rate performance is good. The half-power divergence angle in the embodiments of the present application refers to the angular distribution of the direction in which the light-emitting device receives the strongest optical power in the far field. Taking the angle of the direction of the strongest optical power as the center, and taking half of the optical power in the strongest direction as the limit, each half to calculate the half-power divergence angle. Conversely, for the light-receiving device of the photosensitive unit, such as a photodiode, the far-field light-receiving angle of the half-power light-receiving angle is centered on the angle of the direction of the strongest light-receiving power, and half of the light power in the direction of the strongest light-receiving power is limit, half of the left and right sides to calculate the half-power light-receiving angle.

Optionally, as shown in FIG. 12 is the layout of a biometric detection apparatus according to another embodiment of the present application. In the biological feature detection device, photodiodes 703 are arranged on both sides of the light-emitting device 701, which is beneficial to improve the utilization rate of light.

Optionally, as shown in FIG. 13 , there are various layouts of the biometric detection apparatus according to another embodiment of the present application. For example, it may be a cross-shaped layout, a T-shaped layout, a linear-shaped layout, or a circular layout. In the cross-shaped layout, the light-emitting device is arranged in the middle, and the photodiodes are arranged above, below, left and right of the light-emitting device, respectively; or the photodiode is arranged in the middle, and the photodiodes are arranged above, below, left and right respectively. The light-emitting device, for example, the light-emitting device may include three light-emitting devices of red LED, infrared LED and green LED at the same time. In a T-shaped layout in the middle, the light emitting device is arranged on the left, the photodiode is arranged in the middle, the light emitting device is arranged on the right, and the light emitting device is arranged on the lower part. It includes two light-emitting devices, red LED and infrared LED, or in a T-shaped layout, a photodiode is set on the left, a light-emitting device is set in the middle, a photodiode is set on the right, and a photodiode is set on the bottom. In an in-line layout, light-emitting devices are arranged on the left, photodiodes are arranged in the middle, and light-emitting devices are arranged on the right. For example, the light-emitting devices arranged on the left and right include red LED, infrared LED and green LED at the same time. In the type layout, the photodiode is set on the left, the light-emitting device is set in the middle, and the photodiode is set on the right. In a circular layout, the light-emitting device is arranged in the middle, and the light-emitting device and photodiode are arranged around the periphery of the light-emitting device. The surrounding light-emitting devices and photodiodes can be arranged at intervals. For example, the light-emitting device arranged in the middle only includes green LEDs, and the peripheral The light-emitting devices arranged around include three light-emitting devices of red LED, infrared LED and green LED at the same time.

The light-reflecting component in this embodiment of the present application includes one or more light-emitting devices. For example, the light-emitting device may only include any one of red LEDs, infrared LEDs, or green LEDs, or the light-emitting device may include both red LEDs and infrared LEDs. There are two kinds of light-emitting devices of LED, and the light-emitting device may also include three light-emitting devices of red LED, infrared LED and green LED, which are not limited in the embodiment of the present application.

14 is a schematic diagram of the relationship between the half-power light-receiving angle and the light intensity in the embodiment of the present application. When the half-power light-receiving angle is less than or equal to 30° and greater than or equal to -30°, the light intensity is relatively large. When the half-power light-receiving angle of the diode is within the range of less than or equal to 30° and greater than or equal to -30°, the light intensity received by the photodiode is larger, and more useful information is obtained, which is beneficial to improve the performance in the state of motion. Accuracy of biometric detection.

Optionally, an embodiment of the present application further provides a wearable device, including the biometric detection device in the various embodiments described above and a display, where the display is used to display the biological information detected by the biometric detection device characteristic information. For example, the biometric information may be heart rate and/or blood oxygen information.

The wearable device can be, for example, a wristband, a watch, an earphone, etc., and the wearable device can be used to implement functions such as heart rate detection, exercise step recording, and the like.

The wearable device of the embodiments of the present application has the beneficial effects of any of the foregoing embodiments.

It is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

Those of ordinary skill in the art can realize that the units and circuits of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed circuits, branches and units may be implemented in other manners. For example, the branches described above are schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into A branch, or some feature can be ignored, or not implemented.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A biometric detection device, characterized in that it includes:

one or more light emitting devices for generating a light beam;

The uniform light layer is arranged above the light emitting device, so that the light beam of the light emitting device is scattered into the human skin after passing through the uniform light layer, and spreads in the human skin. The haze of the layer is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%;

One or more photodiodes, the photodiodes are used to receive the light beams after propagating in the human skin, and convert the received light signals of the light beams into electrical signals for biometric detection.
The biological feature detection device according to claim 1, wherein the vertical distance between the light-emitting device and the light-diffusing layer is between 0.1-1 mm.
The biometric detection device according to claim 1, wherein the center distance between the light-emitting device and the photodiode is between 3-10 mm.
The biometric detection device according to claim 1, wherein the light leveling layer comprises a light leveling film and a transparent cover plate, and the light leveling film is arranged on the lower surface of the transparent cover plate.
The biometric detection device according to claim 4, wherein the haze of the uniform light layer is greater than or equal to 70%, and the transmittance of the light emitted by the corresponding light-emitting device is greater than or equal to 40%, specifically:

The haze of the uniform light film is greater than or equal to 70%, and the transmittance of the corresponding light emitted by the light-emitting device is greater than or equal to 40%.
The biometric detection device according to claim 1, wherein the uniform light layer comprises a non-transparent cover plate, and the haze of the non-transparent cover plate is greater than or equal to 70%, corresponding to the transmittance of the light emitted by the light-emitting device greater than or equal to 40%.
The biometric detection device according to any one of claims 1-6, wherein the biometric detection device further comprises:

A threaded collimating lens, the threaded collimating lens is disposed above the photodiode, and the half-power light-receiving angle of the threaded collimating lens is less than or equal to 30°, and/or greater than or equal to -30°.
The biometric detection device according to claim 7, wherein the vertical distance between the threaded collimating lens and the photodiode is between 0.1-1 mm.
The biometric detection device according to any one of claims 1-6, wherein the biometric detection device further comprises:

a micro-collimating lens array, the focal length of the micro-collimating lens is located on the upper surface of the photodiode;

Micro-aperture diaphragm array, the micro-aperture diaphragm array is provided at the focal length of the photodiode, and the half-power light-receiving angle of the micro-aperture diaphragm array is less than or equal to 30°, and/or, greater than or equal to - 30°.
The biometric detection device according to any one of claims 1-6, wherein a uniform light film is arranged above the photodiode, and the half-power light receiving angle of the uniform light film is less than or equal to 30°, and/or, greater than or equal to -30°.
The biological feature detection device according to any one of claims 1-7, wherein the biological feature detection device further comprises:

A transparent cover plate, the transparent cover plate is arranged above the photodiode.
The biometric detection device according to claim 1, wherein the biometric detection device further comprises:

The white ink layer, the white ink layer and the light-emitting device are arranged on the PCB board, and the white ink layer is used for diffuse reflection of the light beam passing through the uniform light layer.
The biometric detection device according to claim 1, wherein a black light blocking layer is provided between the light emitting device and the photodiode to block stray light.
A wearable device, comprising the biometric detection device according to any one of claims 1 to 10 and a display, wherein the display is used to display biometric information detected by the biometric detection device.