CN215078393U

CN215078393U - Biological characteristic detection device and wearable equipment

Info

Publication number: CN215078393U
Application number: CN202120798604.0U
Authority: CN
Inventors: 蒋鹏
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2021-12-10
Anticipated expiration: 2031-04-19

Abstract

The application provides a biological feature detection device and wearable equipment, this biological feature detection device includes: one or more light emitting devices for generating a light beam; the light homogenizing layer is arranged above the light emitting device, so that light beams of the light emitting device are diffused through the light homogenizing layer and then emitted into human skin, and the light beams are transmitted in the human skin, the haze of the light homogenizing layer is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%; one or more photodiodes for receiving the light beam after propagation from the human skin and converting the received light signal of the light beam into a heart rate and/or blood oxygen detection signal. The application discloses biological characteristic detection device and wearable equipment can avoid the people's eye to see luminescent device has improved the outward appearance of product.

Description

Biological characteristic detection device and wearable equipment

Technical Field

The embodiment of the application relates to the technical field of electronics, in particular to a biological feature detection device and wearable equipment.

Background

In an existing biometric detection device, such as a bracelet, the bracelet includes a Light Emitting Diode (LED) and a Photo Diode (PD) scheme, and a transparent material is disposed above the LED and the PD, so that a user can easily see devices below the LED and the PD, which affects the appearance of the bracelet or the watch.

Disclosure of Invention

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

In a first aspect, a biometric detection device is provided, comprising: one or more light emitting devices for generating a light beam; the light homogenizing layer is arranged above the light emitting device, so that light beams of the light emitting device are diffused through the light homogenizing layer and then emitted into human skin, and the light beams are transmitted in the human skin, the haze of the light homogenizing layer is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%; one or more photodiodes for receiving the light beam after propagation within the human skin and converting the received optical signal of the light beam into an electrical signal for biometric detection.

The biological characteristic detection device enables light beams emitted by the light emitting device to be diffused into human skin after passing through the light homogenizing layer by setting the haze of the light homogenizing layer to be greater than or equal to 70% and the transmittance to be greater than or equal to 40%, so that human eyes can be prevented from directly seeing the light emitting device to a certain degree, and the appearance of a product is improved.

In one possible implementation, the vertical distance between the light emitting device and the light homogenizing layer is 0.1-1 mm.

The vertical distance between the light-emitting device and the light homogenizing layer is set to be 0.1-1mm, so that the performance of biological characteristic detection is improved.

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

In a possible implementation manner, the light uniformizing layer comprises a light uniformizing film and a transparent cover plate, and the light uniformizing film is arranged on the lower surface of the transparent cover plate.

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

In one possible implementation manner, the light uniformizing 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 light emitted by the corresponding light emitting device is greater than or equal to 40%.

Through the design to non-transparent apron, not only improved the accuracy that biological characteristic detected under the motion state, practiced thrift the cost of membrane of evening light simultaneously.

In one possible implementation, the biometric detection apparatus further includes: a threaded collimating lens disposed above the one or more photodiodes, the threaded collimating lens having a half-power acceptance angle of less than or equal to 30 °, and/or greater than or equal to-30 °.

The half-power light-collecting angle of the screw thread collimating lens is smaller than or equal to 30 degrees, and/or larger than or equal to-30 degrees, so that the accuracy of biological feature detection is improved.

In one possible implementation, the perpendicular distance between the threaded collimating lens and the photodiode is between 0.1-1 mm.

In one possible implementation, the biometric detection apparatus further includes: a micro-collimating lens array, the focal length of the micro-collimating lens being located on the upper surface of the photodiode; the micro-aperture diaphragm array is arranged at the focal length of the photodiode, and the half-power light-receiving angle of the micro-aperture diaphragm array is smaller than or equal to 30 degrees and/or larger than or equal to-30 degrees.

By arranging the micro collimating lens array and the micro-hole diaphragm array, the light receiving angle on the photodiode is less than or equal to 30 degrees and/or greater than or equal to-30 degrees, and the accuracy of biological characteristic detection is improved.

In a possible implementation manner, a light homogenizing film is arranged above the photodiode, and the half-power light-receiving angle of the light homogenizing film is smaller than or equal to 30 degrees, and/or is larger than or equal to minus 30 degrees, so that the accuracy of biological feature detection is improved.

In one possible implementation, the biometric detection apparatus further includes: a transparent cover plate disposed over the photodiode.

In one possible implementation, the biometric detection apparatus further includes: the white ink layer and the light-emitting device are arranged on the PCB, and the white ink layer is used for performing diffuse reflection on the light beam passing through the light homogenizing layer.

In one 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, which includes the first aspect and the biometric detection apparatus in any implementation manner of the first aspect, and a display configured to display biometric information detected by the biometric detection apparatus.

The wearable device provided by the application has the advantages that the haze of the light homogenizing layer is larger than or equal to 70% and the transmittance of the light homogenizing layer is larger than or equal to 40% in the biological characteristic detection device, so that light beams emitted by the light emitting device are diffused into the skin of a human body after passing through the light homogenizing layer, human eyes can be prevented from directly seeing the light emitting device to a certain degree, and the appearance of the product is improved.

Drawings

Fig. 1 is a schematic view of a biometric device according to an embodiment of the present application.

Fig. 2 is a schematic view of a biometric detection apparatus according to another embodiment of the present application.

Fig. 3 is a schematic view of a biometric sensing device including a light spreading film in an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a biometric detection apparatus according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a biometric device according to another embodiment of the present application.

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

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

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

FIG. 9 is a schematic view of a biometric sensing device including a non-transparent cover plate in an embodiment of the present application.

FIG. 10 is a schematic view of a biometric sensing device including a micro-collimating lens array in an embodiment of the present application.

FIG. 11 is a schematic view of a biometric sensing device including a light spreading film disposed over a photodiode in an embodiment of the present application.

Fig. 12 is a schematic diagram of components of a biometric sensing device in an embodiment of the present application.

Fig. 13 is a schematic diagram of the components of a biometric sensing device in another embodiment of the present application.

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

Detailed Description

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

In order to avoid the human eyes from seeing the devices in the biological characteristic detection device, in a bracelet or a watch for detecting blood oxygen and heart rate, a screw thread lens is used for dimming, but the light-emitting angle of an LED is too small, and the light-receiving angle of the screw thread lens above a PD is too large, so that the heart rate detection is not accurate in a motion state. Due to the individual differences between LEDs and PDs, each LED and PD needs to be adapted with a suitable screw lens, and in this case, each screw lens needs to be optically designed accordingly, which results in increased time and expense costs.

Therefore, the embodiment of the application provides a biological feature detection device, which can avoid the condition that the accuracy of biological feature detection is not affected when a user is in a motion state, and meanwhile, the condition that the human eyes see the devices below is avoided, and the appearance of a product is improved.

Fig. 1 is a schematic block diagram showing a biometric detection apparatus according to an embodiment of the present application, and as shown in fig. 1, the biometric detection apparatus includes:

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

the light homogenizing layer 102 is arranged above the light emitting device 101, so that light beams of the light emitting device 101 are diffused and emitted into human skin after passing through the light homogenizing layer 102 and are transmitted in the human skin, the haze of the light homogenizing layer 102 is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%;

one or more photodiodes 103, wherein the photodiodes 103 are used for receiving the light beams propagated in the human skin and converting the received optical signals of the light beams into electric signals for biological feature detection.

The haze of the light uniformizing layer 102 is greater than or equal to 70% and the transmittance is greater than or equal to 40%, so that the light-emitting device can be prevented from being directly seen by human eyes to a certain extent, and the appearance of the product is improved.

After the light-emitting device 101 generates the light beam in the embodiment of the present application, the light beam is emitted through the light-homogenizing layer 102, enters the human skin, and propagates in the human skin, and when the human heart pumps blood, blood vessels are filled with blood, and the blood tends to absorb light with a specific wavelength. Therefore, when the heart of the human body beats, the light beam generated by the light emitting device 101 is absorbed by blood under the skin of the human body, and then the light beam transmitted in the skin of the human body is received by the photodiode 103, the photodiode 103 converts the optical signal of the received light beam into an electric signal for detecting biological characteristics, the electric signal for detecting the biological characteristics is a photoelectric pulse wave (PPG) signal, and the biological characteristics such as heart rate, blood oxygen, blood pressure and the like can be extracted by using the signal. The electric signal detected by the biological characteristics is processed by a conditioning circuit and an Analog-to-Digital Converter (ADC) and then transmitted to the MCU, the current biological characteristic condition is calculated, and finally the electric signal is transmitted to a terminal display through a Wireless system such as Bluetooth or Wireless Fidelity (Wi-Fi), and the biological characteristic information is displayed by the display. The light emitting device 101 may be formed of an LED. When the biometric detection device is used for blood oxygen detection, the light-emitting device can comprise a red LED and an infrared LED; when the biometric detection device is in heart rate detection, the light emitting device may comprise a green LED; when the biometric detection device is in heart rate and blood oxygen detection, the light emitting devices may include red, infrared, and green LEDs.

Biological characteristic information in this application embodiment explains with the rhythm of the heart as an example, when the human body is in motion state, the wearable equipment that the human body was worn, for example bracelet or wrist-watch, there is little displacement change for human skin's fixed position, if the light beam that emitting device sent jets into human skin perpendicularly, then the angle of the human skin of jetting into under the motion state produces little change, the route that the light beam propagated in human skin changes, make the heart rate of surveying inconsistent with actual heart rate pulse, the signal that photodiode received this moment not only includes the heart rate signal, the motion interference signal that brings when still including the motion, when the photoelectric signal of the pulse under the motion state change ratio quiescent condition still will be strong, the heart rate detection accuracy under the motion state is just poor.

In the embodiment of the application, the haze of the light uniformizing layer 102 is greater than or equal to 70%, so that the light beam emitted by the light emitting device 103 is diffused through the light uniformizing layer 102 and then enters the skin of a human body, the half-power divergence angle of the light uniformizing layer is large, the influence caused by motion interference signals can be effectively inhibited, the change of optical signals caused by small displacement is weaker than that of photoelectric signals with pulse under a 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, when the half-power divergence angle of the light beam of the light emitting device passing through the light uniformizing layer 102 is greater than or equal to 30 degrees, and/or is less than or equal to-30 degrees, and the half-power light collection angle of the light received by the photodiode 103 is less than or equal to 30 degrees, and/or is greater than or equal to-30 degrees, the heart rate detection accuracy is improved.

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

The biological characteristic information in the embodiment of the 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 uniformizing layer 102 is not required, the half-power light collection angle of the light received by the photodiode 103 is less than or equal to 30 degrees, and/or is greater than or equal to-30 degrees, and the accuracy of heart rate and blood oxygen detection can be improved.

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) 106, a transparent cover plate 105 is disposed above the photodiode 103, a light beam emitted by the light emitting device 103 passes through the light homogenizing layer, is diffused and emitted into the skin of the human body, and is transmitted through the skin of the human body, and the light beam transmitted through the skin of the human body passes through the transparent cover plate 105 and reaches the photodiode 103. A black light-blocking layer 104 is provided between the light-emitting device 101 and the photodiode 103 to eliminate stray light. Preferably, the center distance between the light emitting device 101 and the photodiode 103 is between 3-10mm, so that the performance of the biometric detection is better.

In an 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 upper surface of the PCB, and the white ink 107 is located outside the light emitting device 101. After light emitted by the light-emitting device 101 enters human skin and propagates in the human skin, a part of light beam propagating in the human skin is received by the photodiode 103 through the transparent cover plate 105, the other part of light beam propagating in the human skin reaches the PCB 106 through the light homogenizing film 108 again, the white ink 107 is used for performing secondary reflection on the light beam reaching the PCB 106, and the light reflected for the second time enters the human skin again, so that the light utilization rate is improved.

As shown in fig. 3, the light unifying layer in the embodiment of the present application includes, for example, a transparent cover plate 109 and a light unifying film 108. The light homogenizing film 108 is disposed above the light emitting device 101, and the vertical distance may be, for example, 0.1-1mm, so that the effect of biometric detection is better. The light homogenizing film 108 may be disposed on the lower surface of the transparent cover plate 105, and may be adhered by glue, for example. The haze of the light uniformizing film 108 is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%. That is, the light uniformizing film has a transmittance of 40% or more for red light, infrared light and/or green light emitted from the light emitting device, so that the light emitting device 101 is blocked from being directly seen by human eyes to some extent, and the appearance of the product is improved.

The transparent cover 109 in the embodiment of the present application is made of the same material as the transparent cover 105 over the photodiode 103. In another embodiment of the present application, the transparent cover plate 105 can be provided as a complete piece, covering the light uniformizing film 108, the black light blocking layer 104 and the photodiode 103, as shown in fig. 4, wherein the light uniformizing 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 light uniformizing layer in another embodiment provided by the present application includes, for example, a non-transparent cover plate 110, and a surface of the non-transparent cover plate 110 is frosted, so that a haze of the non-transparent cover plate 110 is greater than or equal to 70%, and a transmittance of light emitted by the light emitting device is greater than or equal to 40%. This application embodiment is through setting up the non-transparent apron 110 after the dull polish for non-transparent apron 110 has the effect of even membrane, thereby has saved the cost of even membrane, makes to block to a certain extent that people's eye directly sees luminescent device, has improved the outward appearance of product.

In order to improve the accuracy of heart rate detection in a sports state, the present application provides another embodiment, as shown in fig. 7, the biometric detection apparatus comprising: one or more light emitting devices 701, a light unifying layer 702, one or more photodiodes 703, and a threaded collimating lens 711. A light emitting device 701 is disposed on the PCB 706, the light emitting device 701 for generating a light beam; the light uniformizing layer 702 is arranged above the light emitting device 701, so that a light beam generated by the light emitting device 701 is diffused through the light uniformizing layer 702 and then emitted into the skin of a human body, and is transmitted in the skin of the human body, the haze of the light uniformizing layer 702 is greater than or equal to 70%, and the transmittance of light emitted by a corresponding light emitting device is greater than or equal to 40%; one or more photodiodes 703 are disposed on the PCB 706, the photodiodes 703 are configured to receive the light beams propagated in the skin of the human body and convert the received light signals of the light beams into electrical signals for performing biometric detection, the electrical signals for biometric detection are photoplethysmography (PPG) signals, and the signals can be used to extract biometric features such as heart rate, blood oxygen, blood pressure, and the like. Above the photodiode 703 is provided a screw collimating lens 711, which screw collimating lens 711 is used to receive the light beam after propagating in the human skin and make it reach the photodiode 703. The light received by the threaded collimating lens 711 is not perfectly vertical, with a half-power light collection angle of less than or equal to 30, and/or greater than or equal to-30. In a moving state, a signal received by the optical receiver 703 may slightly incline, and the half-power light-receiving angle of the screw collimating lens 711 is set so that interference caused in the moving state is weaker than that of the photodiode 703 in a non-collimated receiving scheme, thereby further improving the accuracy of heart rate detection. The non-collimated acceptance scheme in the embodiments of the present application means that the half-power acceptance angle of the screw collimating lens 711 is greater than 30 °, and/or, less than-30 °.

Alternatively, the vertical distance between the screw collimating lens 711 and the photodiode 703 may be, for example, between 0.1-1mm, so that the biometric detection is more effective.

In the 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 upper surface of the PCB, and the white ink 707 is located outside the light emitting device 701. Light emitted by the light-emitting device 701 enters human skin and propagates in the human skin, a part of light beams after propagating in the human skin are received by the photodiode 703 through the transparent cover plate 705, the other part of light beams after propagating in the human skin reach the PCB 706 through the light homogenizing film 708 again, the white ink 707 is used for performing secondary reflection on the light beams reaching the PCB 706, and the light beams after secondary reflection reach the human skin again, so that the light utilization rate is improved.

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

Alternatively, the light unifying layer 702 may be, for example, a transparent cover plate 709 and a light unifying film 708, as shown in fig. 8. The light homogenizing film 708 is disposed above the light emitting device 701, and the distance may be, for example, 0.1-1mm, so that the heart rate detection effect is better. The light spreading film 708 can be disposed on the lower surface of the transparent cover 709, and can be adhered by glue, for example. The haze of the light uniformizing film 708 is greater than or equal to 70%, and the light transmittance of the corresponding light emitting device is greater than or equal to 40%. The arrangement can prevent human eyes from directly seeing the light-emitting device to a certain extent, and the appearance of the product is improved. Meanwhile, the light beam amount of the skin of a human body is guaranteed, and the heart rate detection accuracy in the motion state is improved.

Optionally, the light uniformizing layer 702 includes, for example, a non-transparent cover plate 710, as shown in fig. 9, a surface of the non-transparent cover plate 710 is frosted, so that the haze of the non-transparent cover plate 710 is greater than or equal to 70%, and the light transmittance of the corresponding light emitting device is greater than or equal to 40%. The embodiment of the application saves the cost of the light homogenizing film, blocks human eyes to directly see the light emitting device to a certain extent, and improves the appearance of the product.

The present application further provides another embodiment to improve the accuracy of biometric detection in motion. As shown in fig. 10, the biometric detection apparatus includes: one or more light emitting devices 801, a light unifying layer 802, one or more photodiodes 803, a micro-collimating lens array 812, and a micro-aperture stop array 813. The light emitting device 801 is arranged on the PCB 806, and the light emitting device 801 is used for generating a light beam; the light homogenizing layer 802 is arranged above the light emitting device 801, so that light beams of the light emitting device are diffused through the light homogenizing layer and then enter human skin, and are transmitted in the human skin, the haze of the light homogenizing layer 802 is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%; one or more photodiodes 803 are disposed on the PCB 806, and the photodiodes 803 are used for receiving the light beams propagating in the human skin and converting the received optical signals of the light beams into electrical signals for biometric detection. The biometric detected electrical signal may be a heart rate and/or blood oxygen detected electrical signal. A micro-collimating lens array 812 is disposed above the photodiode 803, and the focal length of the micro-collimating lens array 812 is located right on the upper surface of the photodiode 803. At the focal distance, a micro aperture stop array 813 is provided, the micro aperture stop array 813 being used to limit the angle of the light beam reaching the photodiode 803 so that a light beam smaller than or equal to 30 °, and/or larger than or equal to-30 ° is received by the photodiode 803. In the moving state, the signal received by the photodiode 803 will generate a slight tilt, and the micro-collimating lens array 812 and the micro-aperture stop 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. By non-collimated acceptance scheme is meant that the half power acceptance angle of micro-collimating lens array 812 and micro-aperture stop array 813 is greater than or equal to 30 deg., and/or less than or equal to-30 deg..

In an embodiment of the present application, the biometric sensing device may further include a white ink 807, as shown in fig. 10. A layer of white ink 807 is laid on the upper surface of the PCB, and the white ink 807 is located outside the light emitting device 801. The light beams emitted by the light emitting device 801 are emitted into the skin of a human body and spread in the skin of the human body, one part of the light beams after being spread in the skin of the human body are received by the photodiode 803 through the transparent cover plate 805, the other part of the light beams after being spread in the skin of the human body reach the PCB 806, the white ink 807 is used for carrying out secondary reflection on the light beams reaching the PCB 806, and the light after the secondary reflection is emitted into the skin of the human body again, so that the light utilization rate is improved.

In the embodiment of the present application, a black light-blocking layer 804 is provided between the light-emitting device 801 and the photodiode 803 for eliminating 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 the biometric detection is better.

The present application provides another embodiment that can improve the accuracy of biometric detection. As shown in fig. 11, the biometric detection apparatus includes: one or more light emitting devices 901, an dodging layer 902, one or more photodiodes 903, and a threaded collimating lens 911. A light emitting device 901 is arranged on the PCB 906, the light emitting device 901 is used for generating a light beam; the light homogenizing layer 902 is arranged above the light emitting device 901, so that light beams generated by the light emitting device 901 are diffused through the light homogenizing layer 902 and then emitted into human skin, and are transmitted in the human skin, the haze of the light homogenizing layer 902 is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%; one or more photodiodes 903 are disposed on the PCB 906, the photodiodes 903 are configured to receive the light beams propagated in the skin of the human body, and convert received optical signals of the light beams into electrical signals for performing biometric detection, the electrical signals for biometric detection are photoplethysmography (PPG) signals, and the signals can be used to extract biometric features such as heart rate, blood oxygen, blood pressure, and the like. A light uniformizing film 908 is disposed over the photodiode 903 so as to improve the accuracy of biometric detection when the half-power light acceptance angle of light received by the photodiode 903 is less than or equal to 30 ° and/or greater than or equal to-30 °.

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

The haze of the light homogenizing layer in the embodiment of the application is larger than or equal to 70%, so that the light beam emitted by the light emitting device is diffused and emitted into the skin of a human body, the change of the optical signal caused by micro displacement is weaker than the photoelectric signal of the pulse in a static state, and 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 embodiment of the application refers to the angular distribution of the far field of the light-emitting device in the direction of receiving the strongest light power, and the half-power divergence angle is calculated by taking the angle of the direction of the strongest light power as the center and the half of the light power in the strongest direction as the boundary, and taking the left half and the right half respectively. On the contrary, for the light receiving device of the photo-sensitive unit, such as the photodiode, the far-field light receiving angle of the half-power light receiving angle is calculated by taking the direction angle of the strongest received light power as the center and taking the half of the light power of the direction of the strongest received light power as the boundary, and the half-power light receiving angle is calculated by the left half and the right half respectively.

Alternatively, as shown in fig. 12, a layout of a biometric detection device according to another embodiment of the present application is shown. In the biological characteristic detecting apparatus, the photodiodes 703 are provided on both sides of the light emitting device 701, which is advantageous for improving the utilization rate of light.

Alternatively, as shown in fig. 13, various layouts of the biometric detection apparatus according to another embodiment of the present application are shown. For example, a cross layout, a T-type layout, a straight layout, or a circular layout. In the cross layout, a light emitting device is arranged in the middle, and photodiodes are respectively arranged above, below, on the left and on the right of the light emitting device; or a photodiode is arranged in the middle, and light emitting devices are respectively arranged above, below, left and right of the photodiode, for example, the light emitting devices may simultaneously include three light emitting devices of a red LED, an infrared LED and a green LED. 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 below, for example, the light emitting device arranged on the left and the right only comprises a green LED, the light emitting device arranged below comprises two light emitting devices of a red LED and an infrared LED, or in the T-shaped layout, the photodiode is arranged on the left, the light emitting device arranged in the middle, the photodiode is arranged on the right, and the photodiode is arranged below. In a straight layout, the light emitting devices are arranged on the left, the photodiodes are arranged in the middle, and the light emitting devices are arranged on the right, for example, the light emitting devices arranged on the left and the right include three light emitting devices of red LEDs, infrared LEDs, and green LEDs, or in a straight layout, the photodiodes are arranged on the left, the light emitting devices are arranged in the middle, and the photodiodes are arranged on the right. In the circular layout, the light emitting device is arranged in the middle, the light emitting device and the photodiode are arranged around the periphery of the light emitting device, the light emitting device and the photodiode around the periphery can be arranged at intervals, for example, the light emitting device arranged in the middle only comprises a green LED, and the light emitting device arranged around the periphery simultaneously comprises three light emitting devices of a red LED, an infrared LED and a green LED.

The light reflection member in the embodiment of the present application includes one or more light emitting devices, for example, the light emitting device may include only one of a red LED, an infrared LED, or a green LED, the light emitting device may also include two of the red LED and the infrared LED, and the light emitting device may also include three of the red LED, the infrared LED, and the green LED, which is not limited in the embodiment of the present application.

Fig. 14 is a schematic diagram of a relationship between a half-power light-receiving angle and light intensity in an embodiment of the present application, where the half-power light-receiving angle is in a range of less than or equal to 30 ° and greater than or equal to-30 °, and the light intensity is relatively large, and when the half-power light-receiving angle of the photodiode is in a range of less than or equal to 30 ° and greater than or equal to-30 °, the light intensity received by the photodiode is relatively large, so that more useful information is obtained, and the accuracy of biometric detection in a motion state is improved.

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

The wearable device can be, for example, a bracelet, a watch, an earphone, and the like, and can be used for realizing functions of heart rate detection, exercise pacing and the like.

The wearable device of the embodiment of the application has the beneficial effects of any embodiment.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all 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 will appreciate that the various illustrative elements and circuits described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed circuits, branches and units may be implemented in other manners. For example, the above-described branch is illustrative, and for example, the division of the unit is only one logical function division, and there may be other division ways in actual implementation, for example, multiple units or components may be combined or integrated into one branch, or some features may be omitted, or not executed.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A biometric detection device, comprising:

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

the light homogenizing layer is arranged above the light emitting device, so that light beams of the light emitting device are diffused through the light homogenizing layer and then emitted into human skin, and the light beams are transmitted in the human skin, the haze of the light homogenizing layer is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%;

one or more photodiodes for receiving the light beam after propagation within the human skin and converting the received optical signal of the light beam into an electrical signal for biometric detection.

2. The biometric detection device of claim 1, wherein the light emitting device is at a vertical distance of between 0.1 mm and 1mm from the light homogenizing layer.

3. The biometric sensing device of claim 1, wherein a center distance between the light emitting device and the photodiode is between 3-10 mm.

4. The biometric characteristic detection device according to claim 1, wherein the light uniformizing layer comprises a light uniformizing film and a transparent cover plate, and the light uniformizing film is disposed on a lower surface of the transparent cover plate.

5. The biometric characteristic detection apparatus according to claim 4, wherein the haze of the light uniformizing layer is greater than or equal to 70%, and the transmittance of light emitted by the corresponding light emitting device is greater than or equal to 40%, specifically:

the haze of the light homogenizing film is greater than or equal to 70%, and the transmittance of light emitted by a corresponding light emitting device is greater than or equal to 40%.

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

7. The biometric detection device according to any one of claims 1 to 6, further comprising:

a threaded collimating lens disposed above the photodiode, the threaded collimating lens having a half-power acceptance angle of less than or equal to 30 °, and/or greater than or equal to-30 °.

8. The biometric detection device of claim 7, wherein a vertical distance between the threaded collimating lens and the photodiode is between 0.1-1 mm.

9. The biometric detection device according to any one of claims 1 to 6, further comprising:

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

the micro-aperture diaphragm array is arranged at the focal length of the photodiode, and the half-power light-receiving angle of the micro-aperture diaphragm array is smaller than or equal to 30 degrees and/or larger than or equal to-30 degrees.

10. The biometric characteristic detection device according to any one of claims 1 to 6, wherein a light uniformizing film is provided above the photodiode, and a half-power light-receiving angle of the light uniformizing film is 30 ° or less and/or-30 ° or more.

11. The biometric detection device according to any one of claims 1 to 7, further comprising:

a transparent cover plate disposed over the photodiode.

12. The biometric detection device according to claim 1, characterized by further comprising:

the white ink layer and the light-emitting device are arranged on the PCB, and the white ink layer is used for performing diffuse reflection on the light beam passing through the light homogenizing layer.

13. The biometric sensing device of claim 1, wherein a black light blocking layer is disposed between the light emitting device and the photodiode to block stray light.

14. A wearable device comprising the biometric detection device of any one of claims 1 to 10 and a display for displaying biometric information detected by the biometric detection device.