CN112674764A - Blood oxygen saturation detection device and electronic equipment - Google Patents
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Abstract
The embodiment of the invention provides a blood oxygen saturation detection device and electronic equipment. The oxyhemoglobin saturation detection device is arranged below a display screen, and comprises: a photoelectric conversion unit including a first light-sensing area, the photoelectric conversion unit receiving a first finger reflected light ray having a first wavelength and a second finger reflected light ray having a second wavelength from above the display screen through the first light-sensing area, and generating pulse data based on the first finger reflected light ray and the second finger reflected light ray; and the detection unit is used for detecting the blood oxygen saturation of the finger based on the pulse data. The embodiment of the invention improves the detection accuracy of the finger blood oxygen saturation.
Description
Technical Field
The embodiment of the invention relates to the field of photoelectric technology, in particular to a blood oxygen saturation detection device and electronic equipment.
Background
The blood oxygen saturation is the percentage of the volume of oxygenated hemoglobin bound by oxygen in the blood to the total bindable hemoglobin volume, i.e., the concentration of blood oxygen in the blood, which is an important physiological parameter of the respiratory cycle. Oxyhemoglobin denotes hemoglobin bound by oxygen in blood. Reduced hemoglobin refers to hemoglobin in blood that is not bound by oxygen.
Wearable devices such as smart bracelets and smart watches employ infrared and red alternating means to acquire pulse signals to calculate the above-described blood oxygen saturation. However, in the related art, when the fitting is not ideal when the wearable device is worn, the detection accuracy of the blood oxygen saturation is poor.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a blood oxygen saturation detection apparatus and an electronic device.
According to a first aspect of embodiments of the present invention, there is provided a blood oxygen saturation detection apparatus provided below a display screen, the apparatus including: the photoelectric conversion unit comprises a first photosensitive region. The photoelectric conversion unit receives a first finger reflected light ray with a first wavelength and a second finger reflected light ray with a second wavelength from the upper part of the display screen through the first photosensitive area, and generates pulse data based on the first finger reflected light ray and the second finger reflected light ray; and the detection unit is used for detecting the blood oxygen saturation of the finger based on the pulse data.
According to a second aspect of embodiments of the present invention, there is provided an electronic apparatus, including: a display screen, and the blood oxygen saturation detection device according to the first aspect, which is provided below the display screen.
In the scheme of the embodiment of the invention, because the upper surface of the display screen is attached by fingers, accurate pulse data can be generated based on the first finger reflected light and the second finger reflected light from the upper part of the display screen, so that the detection accuracy of the blood oxygen saturation of the fingers is improved.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic diagram of a wearable device of a typical example;
fig. 2A is a schematic block diagram of a blood oxygen saturation detection apparatus according to an embodiment of the present invention;
fig. 2B is a schematic side view of the electronic device including the blood oxygen saturation detection apparatus of the embodiment of fig. 2A;
fig. 2C is a schematic diagram of an arrangement of photosensitive regions of a photoelectric conversion unit according to another embodiment of the present invention;
fig. 3A is a schematic side view of an electronic device including a blood oxygen saturation detection apparatus according to another embodiment of the present invention;
fig. 3B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention;
fig. 4A is a schematic side view of an electronic device including a blood oxygen saturation detection apparatus according to another embodiment of the present invention;
fig. 4B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention;
fig. 5A is a schematic side view of an electronic device including a blood oxygen saturation detection apparatus according to another embodiment of the present invention;
fig. 5B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention;
fig. 6A is a schematic side view of an electronic device including a blood oxygen saturation detection apparatus according to another embodiment of the present invention;
fig. 6B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention;
FIG. 7 is a schematic flow chart of a method of blood oxygen saturation detection according to another embodiment of the present invention;
FIG. 8 is a schematic flow chart of a method of blood oxygen saturation detection according to another embodiment of the present invention; and
fig. 9 is a schematic block diagram of an electronic device of another embodiment of the present invention.
Detailed Description
The following further describes specific implementation of the embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic diagram of a wearable device of a typical example. Wearable devices such as smart bracelets and smart watches employ infrared and red alternating means to acquire pulse signals to calculate the above-described blood oxygen saturation. As shown in fig. 1, the light emitting device is a red light source and an infrared light source, which alternately emit a red light signal and an infrared light signal to irradiate a human body part to be detected (e.g., a wrist, etc.), and the light sensing device correspondingly collects a reflected signal. Because send ruddiness signal and infrared light signal in turn, the pulse signal that ruddiness and infrared light were gathered is asynchronous, at this moment if wearable equipment with wait to detect when the laminating of position is unsatisfactory, the pulse signal that photosensitive device sensing received the interference influence of the ambient light that changes, lead to the detection accuracy of the oxyhemoglobin saturation who records to be relatively poor.
Fig. 2A is a schematic block diagram of an oxygen saturation detection device of one embodiment of the present invention, and fig. 2B is a schematic side view of an electronic apparatus including the oxygen saturation detection device of the embodiment of fig. 2A.
As shown in fig. 2A and 2B, the blood oxygen saturation detection device 210 is disposed below the display screen 220, and the blood oxygen saturation detection device 210 includes a photoelectric conversion unit 201 and a detection unit 202.
It should be understood that the display screen herein may be a display screen of an electronic device. Electronic devices include, but are not limited to: a mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include: smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, etc.; ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as iPad; a portable entertainment device: such devices can display and play multimedia content. This type of device comprises: audio, video players (e.g., ipods), handheld game consoles, electronic books, and smart toys and portable car navigation devices; and other electronic equipment with data interaction function.
It should also be understood that the Display screen herein may include displays such as an Organic Light-Emitting Display (OLED), an Active Matrix Organic Light-Emitting Diode (AMOLED) panel, or a Liquid Crystal Display (LCD). For an LCD display, a backlight module is disposed below a display panel, and the backlight module can be processed with holes or optically designed to obtain light transmission above the display screen.
It is also understood that the blood oxygen saturation detection device 210 may perform blood oxygen saturation detection when an application having a function such as heart rate detection is started. In the interface of the application, the user may be prompted for a finger placement area, e.g., a finger press area, in a manner such as a particular color highlighting a particular partial area. At least one of the light of the first wavelength or the light of the second wavelength may also be illuminated for the finger placement area. Other alternate light sources may be disposed below the display screen, for example, for illuminating at least one of the first wavelength of light or the second wavelength of light. And when the display screen detects that the finger placement area is blocked so as to have a matched fit degree, the controller of the display controls the standby light source or the display screen to execute the irradiation operation. The controller of the display may further send a control signal to the blood oxygen saturation detection device when the display screen detects that the finger placement region is blocked so as to have a matching degree of fitting, the control signal instructing the blood oxygen saturation detection device to perform processing of at least one of the photoelectric conversion unit and the detection unit. For example, the photoelectric conversion unit may be always in an on state, and the controller of the display sends a control signal to the detection unit when the finger placement area is blocked.
The photoelectric conversion unit 201 includes a first photosensitive region 241.
It is to be understood that the photoelectric conversion unit may be constituted by a device such as a photodiode, for example, composed of a single photodiode or a photodiode array. The light sensing area of the photoelectric conversion unit may be a plane or a curved surface, and in a plan view, the light sensing area of the photoelectric conversion unit may form a circle, a rectangle, or the like, and be adapted to a lower side of a display screen of the electronic device. The first photosensitive region may form all or part of the photosensitive region of the photoelectric conversion unit. The first photosensitive area may match the shape of the finger rest area.
It is also understood that the light sensing region of the photoelectric conversion unit may further include a second light sensing region for fingerprint recognition. The first photosensitive region and the second photosensitive region may form all or part of the photosensitive region of the photoelectric conversion unit. The first photosensitive region and the second photosensitive region may be adjacent regions to increase the utilization efficiency of the photosensitive regions of the photoelectric conversion unit. The first photosensitive regions may be provided as separate regions, for example, the first photosensitive regions may be provided on both sides of the second photosensitive regions, in other words, the first photosensitive regions are spaced apart by the second photosensitive regions. A plurality of first photosensitive regions and a plurality of second photosensitive regions may also be arranged at intervals.
The photoelectric conversion unit 201 receives a first finger reflected light ray having a first wavelength and a second finger reflected light ray having a second wavelength from above the display screen 220 through the first light-sensing area 241, and generates pulse data based on the first finger reflected light ray and the second finger reflected light ray.
It is to be understood that the first wavelength is different from the second wavelength, and the first wavelength may be less than the second wavelength. Either one of the first wavelength and the second wavelength may be visible light or invisible light. For example, the first wavelength may be in the red wavelength band and the second wavelength may be in the infrared wavelength band. In addition, the first light reflected from the finger may be formed by illumination from a first light source and the second light reflected from the finger may be formed by illumination from a second light source. Accordingly, the first photosensitive region may be disposed corresponding to a position of the light source.
The detection unit 202 detects the finger blood oxygen saturation level based on the pulse data.
In the scheme of the embodiment of the invention, because the upper surface of the display screen is attached by fingers, accurate pulse data can be generated based on the first finger reflected light and the second finger reflected light from the upper part of the display screen, so that the detection accuracy of the blood oxygen saturation of the fingers is improved.
Alternatively, as another example, the photoelectric conversion unit 201 further includes a first photosensitive region 242. The photoelectric conversion unit 201 receives the reflected light from the third finger above the display screen 220 through the second photosensitive region 242 for fingerprint recognition. It should be appreciated that the third finger may reflect light at a wavelength less than the red wavelength band.
In this example, since the photoelectric conversion unit includes the first photosensitive region for generating pulse data and the second photosensitive region for performing fingerprint recognition, the first finger-reflected light, the second finger-reflected light, and the third finger-reflected light all come from above the display screen, the utilization efficiency of the photosensitive regions is improved, and the detection efficiency of the blood oxygen saturation detection device is improved.
Further, the periphery of the photoelectric conversion unit may be arranged with a plurality of second light sources, and in the light sensing region of the photoelectric conversion unit, the first light sensing region may be arranged around the second light sensing region to correspond to positions of the plurality of second light sources, and the first light source may be a portion of the display screen (e.g., a self-luminous display screen) corresponding to the first light sensing region.
In one example, the detection unit may be disposed to other positions of the electronic device, for example, between the display screen and the photoelectric conversion unit at an edge or a corner of the display screen, thereby reducing the thickness of the electronic device while ensuring a light sensing distance between the photoelectric conversion unit and the display to ensure detection light sensing.
In another example, the detection unit may be disposed below or at a side of the photoelectric conversion unit, and the detection unit is integrally packaged with at least the photoelectric conversion unit into a chip or a module.
In another example, the photoelectric conversion unit receives a third finger reflected light from above the display screen through the second photosensitive region and generates fingerprint data based on the third finger reflected light, the apparatus further comprising: and a fingerprint identification unit for performing fingerprint identification based on the fingerprint data.
In another example, the detecting unit and the fingerprint recognizing unit are disposed below or at a side of the photoelectric conversion unit, wherein the photoelectric conversion unit, the detecting unit and the fingerprint recognizing unit are integrally packaged into a chip or a module.
In another example, the third finger reflected light may be formed by illumination by a third light source. For example, the third light source and the first light source may be light sources formed by emitting light of the third wavelength and the first wavelength from the same portion of the display screen, since a plurality of light sources are provided without increasing the space of the components.
In particular, when a user may launch an interface such as an oximetry application or other application with oximetry functionality in an electronic device such as a cell phone. The user may press a finger against the fingerprint sensing area in the interface. In one example, a software program may be used to control the illumination of a red spot at a fingerprint sensing area above the display screen while illuminating an infra-red LED below the screen. In another example, a first light source (e.g., a red LED lamp) and a second light source (e.g., an infrared LED lamp) may be illuminated alternately.
In one example, the first wavelength is in the red wavelength band (between 600nm and 805nm, e.g., 660nm) and the second wavelength is in the infrared wavelength band (greater than 850nm, e.g., 940 nm). Thereby achieving a better penetration into the physiological tissue and ensuring a sufficient signal. In addition, one of the red light wave band and the infrared light wave band realizes the consistency of the absorption coefficients of the reduced hemoglobin and the oxygenated hemoglobin, and the light with the other wavelength forms larger difference on the absorption coefficients of the reduced hemoglobin and the oxygenated hemoglobin, thereby improving the detection sensitivity. In addition, the red light band and the infrared light band realize color light with little change of the absorption coefficient after the wavelength is deviated due to the dispersion of the wavelength of the diode.
In another embodiment of the present invention, the first reflected light ray is formed by irradiation of a first light source, and the second reflected light ray is formed by irradiation of a second light source. In another implementation of the present invention, the detection unit is specifically configured to: extracting a pulse signal corresponding to a first wavelength and a pulse signal corresponding to a second wavelength based on the pulse data; calculating the respective AC-DC proportional relationship between the pulse signal with the first wavelength and the pulse signal with the second wavelength, wherein the AC-DC proportional relationship indicates the proportion between the signal AC component and the signal DC component; and the detection module detects the blood oxygen saturation of the finger according to the respective AC-DC proportional relation.
Since the blood oxygen saturation is the percentage of the volume of oxyhemoglobin combined by oxygen in blood to the volume of total combinable hemoglobin, the finger blood oxygen saturation is detected through the AC-DC proportional relationship, and the calculation efficiency is improved.
Specifically, as an example, extracting a pulse signal corresponding to a first wavelength and a pulse signal corresponding to a second wavelength based on pulse data may include: and acquiring the pulse data based on a preset frame rate to obtain a pulse signal corresponding to the first wavelength and a pulse signal corresponding to the second wavelength. As an example, calculating the ac-dc ratio relationship between the pulse signal of the first wavelength and the pulse signal of the second wavelength may include: determining the average signal characteristics of the pulse signals with the first wavelength and the second wavelength based on a preset frame rate respectively; and calculating the AC-DC proportional relation of the pulse signals with the first wavelength and the pulse signals with the second wavelength according to the average signal characteristics.
Further, for the acquisition of the pulse data based on the preset frame rate, the continuous acquisition of the fingerprint data may be controlled at a fixed frame rate (e.g., 10HZ to 1K). Determining the pulse signals of the first wavelength and the second wavelength based on the average signal characteristics of the preset frame rate, respectively, may calculate average optical signal amounts of red and infrared bands in the sampled data, for example, a photoplethysmography (PPG) signal characteristic that an optical signal amount of continuous multi-frame finger pressing data exhibits a strong heart rate over a period of time. The blood oxygen saturation can be obtained by calculating the signal AC-DC ratio of the red light and the infrared band according to the signal characteristics.
Specifically, the blood oxygen saturation level SPO2 ═ HbO2/(HbO2+ Hb) × 100%, where HbO2 represents oxyhemoglobin; HB denotes reduced hemoglobin. When light of a specific wavelength is incident, the light energy transmitted through human tissue can be divided into two parts: some are constant and contain non-pulsating components such as muscle, bone, etc.; the other part is a fluctuation component, which is caused by the contraction and the relaxation of the blood vessel along with the heart, and mainly reflects the absorption of light by HB and HbO2 in the artery, so that two light sources can be selected to obtain the alternating current and direct current parts of two substances in the blood to calculate the blood oxygen.
According to the Labobel law, light transmitted to a medium is absorbed by the medium, and the proportion of absorption is related to the wavelength of the incident light and the optical path of the light propagating in the medium. For example, if a monochromatic incident light passes through a uniform medium and the thickness of the medium is d, the transmitted light intensity I and the incident IO light intensity have the following relationship.
I＝IO*e-LCd (1)
Wherein L represents an absorption coefficient of the medium for a specific wavelength of light; c represents the concentration of the medium; d represents the optical path of the light through the medium.
Since hemoglobin in blood mainly comprises reduced hemoglobin (Hb) and oxygenated hemoglobin (Hbo2), the blood can be considered as a medium solution with uniform concentration, i.e., the incident light intensity through the human finger is I, and the reflected light intensity received by the light receiver is I0, so that the following formula can be obtained.
I＝I0*e-L0C0d0*e-LHbCHbd*e-LHbO2CHbo2d (2)
Here, L0, C0, and d0 respectively indicate the sum of light absorption coefficients of static components such as venous blood, muscle, and skin, the concentration of the light-absorbing static component, and the optical path length of the penetrating static component. LHb, CHb, and d represent the light absorption coefficient of reduced hemoglobin in arterial blood, the concentration of reduced hemoglobin, and the arterial optical path, respectively. LHbo2, CHbo2, and d represent the light absorption coefficient of oxyhemoglobin in arterial blood, the concentration of oxyhemoglobin, and the arterial optical path, respectively.
The pulse of the human heart can cause artery contraction and relaxation, so that the artery optical path when the artery contracts is assumed to be d1, the received reflected light intensity is IDC, the artery optical path when the artery relaxes is assumed to be d2, and the received reflected light intensity is IDC-IAC; and d 2-d 1 ═ Δ d. Then the following relationship exists:
IDC-IAC＝IDC*e-LHbCHb△d*e-LHbO2CHbo2△d (3)
from (3), it can be deduced that (4):
ln[(IDC-IAC)/IDC]＝-(LHbCHb+LHbo2CHb02)*△d (4)
since the AC component is much smaller than the DC component, it is possible to reduce the power consumption of the DC component
ln[(IDC-IAC)/IDC]≈IAC/IDC (5)
From (4) and (5), one can derive (6):
IAC/IDC＝＝-(LHbCHb+LHbo2CHb02)*△d (6)
since Δ d in the formula (6) is an unknown quantity, two lights with different wavelengths need to be respectively incident, and the Δ d can be cancelled by substituting the formula 6, assuming that the wavelengths of the two lights are λ 1 and λ 2:
λ1：Dλ1＝IAC_λ1/IDC_λ1＝-(LHb_λ1CHb+LHbo2_λ1CHb02)*△d(7)
λ2：Dλ2＝IAC_λ2/IDC_λ2＝-(LHb_λ2CHb+LHbo2_λ2CHb02)*△d(8)
since (7) and (8) are compared with two sides of equal sign of the two formulas to obtain (9):
Dλ1/Dλ2＝(LHb_λ1CHb+LHbo2_λ1CHb02)/(LHb_λ2CHb+LHbo2_λ2CHb02) (9)
therefore, the blood oxygen saturation is calculated as follows:
SpO2＝HbO2/(HbO2+Hb)*100％ (10)
deriving from (9) and (10) the blood oxygen saturation as the oxyhemoglobin concentration and the ratio of the oxyhemoglobin concentration to the sum of the oxyhemoglobin concentrations:
SpO2＝[LHb_λ2*(Dλ1/Dλ2)–LHb_λ1]/[(LHbO2_λ1–LHb_λ1)-(LHbO2_λ2–LHb_λ2)**(Dλ1/Dλ2)] (11)
when λ 2 is chosen to be the 850 th later band (reference may be made to 940nm wavelength), then LHbO2_ λ 2 ≈ LHb _ λ 2:
SpO2＝[LHb_λ2*(Dλ1/Dλ2)–LHb_λ1]/(LHbO2_λ1–LHb_λ1) (12)
wherein LHb _ λ 2, LHb _ λ 1 and LHbO2_ λ 1 are constants, so that the blood oxygen has a relation with the AC-DC ratio of two wave bands. Based on the measured PPG signals of 660 and 940 wave bands, the dc and ac components are quantified, resulting in the blood oxygen saturation.
In another embodiment of the present invention, the first reflected light ray is formed by irradiation of a first light source, and the second reflected light ray is formed by irradiation of a second light source.
Since different light sources are beneficial to controlling the wavelength of the emitted light, the light reflected by the finger with different wavelengths is beneficial to realizing.
In another embodiment of the present invention, a mixed finger reflected light of the first finger reflected light and the second finger reflected light is formed by simultaneously illuminating the finger with the first light source and the second light source. The first photosensitive area comprises a first sub-photosensitive area and a second sub-photosensitive area, and a first filter for selecting a first wavelength and a second filter for selecting a second wavelength are arranged above the first sub-photosensitive area and the second sub-photosensitive area respectively.
Because the first filter for selecting the first wavelength and the second filter for selecting the second wavelength are respectively arranged above the first sub-photosensitive area and the second sub-photosensitive area, the light rays with the first wavelength and the light rays with the second wavelength can be obtained through the first filter and the second filter, and the light rays with different wavelengths are reliably separated. Fig. 2C shows an arrangement of light sensing regions of a photoelectric conversion unit of another embodiment of the present invention.
In another example, a third filter selecting a third wavelength may be disposed over the second photosensitive region. The third finger reflected light may be formed by illumination of a third light source. The mixed finger reflected light of the first finger reflected light, the second finger reflected light, and the third finger reflected light may be formed by simultaneously illuminating the finger with the first light source, the second light source, and the third light source. The wavelengths of the first light source, the second light source, and the third light source may be different from each other.
In another implementation of the invention, the first light source is at least a portion of a display screen, the display screen is a self-emissive display screen, and the second light source is disposed below the display screen.
Since a portion of the self-luminous display screen is used as the first light source, the utilization efficiency of components is improved, in other words, a space for adding an additional first light source is saved.
In another implementation of the invention, the first light source and the second light source are both disposed below the display screen.
Since the first light source and the second light source are both disposed below the display screen, it is achieved that integration of functions related to the blood oxygen saturation detection device into the electronic apparatus is facilitated.
Specifically, for the existing OLED or AMOLED, a self-luminous red light spot light source (605-700 nm) such as a display screen can be used as a first light source to illuminate a finger, multi-frame pulse data can be continuously collected, and collection of red light (including but not limited to 660nm wave band) pulse signals can be achieved.
By adding a second light source such as an infra-red lamp under the screen to irradiate the finger and continuously collecting multi-frame data, the pulse signal collection of the infrared (including but not limited to the 940nm wave band) wave band is realized.
Because the fingerprint image sensor can directly receive red light and infrared light, and is easy to cause overexposure of fingerprint image areas in outdoor strong light environments, two areas are added in the fingerprint image sensor for transmitting red light wave bands (including but not limited to 660nm wave bands) and infrared wave bands (including but not limited to 940nm wave bands) respectively, and the rest areas are used for visible light fingerprint imaging.
Under the condition that the appearance of the mobile phone is not affected, the infrared supplementary lighting under the screen is used for generating an infrared wave band from a second light source such as an infrared LED lamp below the display screen, penetrating through the display screen, entering a finger, penetrating through the finger and carrying a pulse signal, entering a specific area of a photoelectric conversion unit (for example, a fingerprint chip) and extracting the pulse signal of the infrared wave band (including but not limited to a 940nm wave band).
The red light spots can be lightened through the display screen, under the condition that the cost of hardware is not increased, the red light spots penetrate through the skin of a finger so as to carry pulse signals, the red light spots are reflected into a specific area of a photoelectric conversion unit (such as a fingerprint chip), and the pulse signals of the red light spots (including but not limited to the 660nm wave bands) are extracted.
A first light source such as a display screen red light spot and a second light source such as an under-screen infrared LED lamp can be simultaneously illuminated for acquiring pulse signals of different frequency bands.
In another embodiment of the invention, the first and second reflected light rays are formed by alternately illuminating the finger with the first and second light sources.
The first finger reflection light and the second finger reflection light are formed by alternately irradiating the fingers through the first light source and the second light source, so that the collection of different wavelength relations is realized by adopting the same photosensitive area.
In another implementation of the invention, the first light source is at least a portion of a display screen, the display screen is a self-emissive display screen, and the second light source is disposed below the display screen.
Since a portion of the self-luminous display screen is used as the first light source, the utilization efficiency of components is improved, in other words, a space for adding an additional first light source is saved.
In another implementation of the invention, the first light source and the second light source are both disposed below the display screen.
Since the first light source and the second light source are both disposed below the display screen, it is achieved that integration of functions related to the blood oxygen saturation detection device into the electronic apparatus is facilitated.
Specifically, for an OLED or an AMOLED, an infrared light lamp and a red light lamp under a screen are added to alternately illuminate a finger, multi-frame data are continuously collected, and the collection of pulse signals in an infrared band (including but not limited to a 940nm band) and the collection of pulse signals in a red band (including but not limited to a 660nm band) are realized.
In one example, a first photosensitive area may be reserved on the fingerprint sensor for detecting red and infrared bands, and other areas, such as a second photosensitive area, may be reserved for fingerprint detection.
Under the condition that the appearance of the mobile phone is not affected, the infrared supplementary lighting is carried out under the screen, the infrared wave band is generated from an LED lamp below the screen, penetrates through the screen, enters a finger, then penetrates through the finger and carries a pulse signal, enters a specific area of a photoelectric conversion unit (such as a fingerprint chip), and the pulse signal of the infrared wave band (including but not limited to a 940nm wave band) is extracted.
Supplementary lighting (including but not limited to a 660nm band) of a red light source arranged below the display screen, such as an off-screen red light LED lamp, penetrates through the screen, enters a finger to carry a pulse signal, and then is reflected to a specific area of a photoelectric conversion unit (for example, a fingerprint chip), so that the pulse signal of the red light band (which can refer to the 660nm band, but is not limited to the band) is extracted.
The first light source such as under-screen red LED lamp and the second light source such as infrared LED lamp can be alternatively lighted for collecting pulse signals of different frequency bands
The second photosensitive area (e.g., the photosensitive area of the fingerprint image sensor) needs to be avoided because unlocking in a scene such as outdoor sun exposure causes overexposure of the fingerprint image area, loss of image fingerprint lines, and difficulty in unlocking the fingerprint due to outdoor glare, which can block part of the red and infrared bands. The first photosensitive area is added on the fingerprint image sensor for transmitting light in a red light wave band (including but not limited to a 660nm wave band) and an infrared wave band (including but not limited to a 940nm wave band), and the rest areas such as the second photosensitive area are used for fingerprint imaging, so that the problem of difficulty in unlocking outdoor strong light can be solved through fingerprint identification of the second photosensitive area, and blood oxygen detection can be realized through the first photosensitive area.
Fig. 3A is a schematic side view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. The blood oxygen saturation detection device 340 is disposed below the display screen 320, and the blood oxygen saturation detection device 340 includes:
and a photoelectric conversion unit including a first light sensing region 341 and a second light sensing region 342, wherein the photoelectric conversion unit receives a first finger reflected light having a first wavelength and a second finger reflected light having a second wavelength from above the display screen 320 through the first light sensing region 341 and generates pulse data based on the first finger reflected light and the second finger reflected light, and wherein the photoelectric conversion unit receives a third finger reflected light from above the display screen 320 through the second light sensing region 342 for fingerprint recognition. And a detection unit which detects the blood oxygen saturation of the finger based on the pulse data.
For example, the first, second, and third finger reflected rays may come from the finger 310.
Fig. 3B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. In the embodiment of the invention, the first finger reflected light is formed by irradiation of the first light source, and the second finger reflected light is formed by irradiation of the second light source. The first and second finger reflected light rays are formed by alternately illuminating the finger 310 with the first and second light sources. The first light source 321 is at least a portion of the display screen 320, for example, the display screen is a self-luminous display screen, and the second light source 330 is disposed under the display screen 320. In another example, the first light source and the second light source are both disposed below the display screen 320.
Fig. 4A is a schematic side view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. The blood oxygen saturation detection device 440 is provided below the display screen 420, and the blood oxygen saturation detection device 440 includes:
a photoelectric conversion unit including a first light sensing region 441 and a second light sensing region 442, wherein the photoelectric conversion unit receives a first finger reflected light having a first wavelength and a second finger reflected light having a second wavelength from above the display screen 420 through the first light sensing region 441, and generates pulse data based on the first finger reflected light and the second finger reflected light, and wherein the photoelectric conversion unit receives a third finger reflected light from above the display screen 420 through the second light sensing region 442 for fingerprint recognition; and a detection unit which detects the blood oxygen saturation of the finger based on the pulse data.
For example, the first, second, and third finger reflected rays may come from the finger 410.
Fig. 4B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. The first finger reflected light is formed by the irradiation of the first light source 421, and the second finger reflected light is formed by the irradiation of the second light source 430. In another example, a mixed finger reflected light of the first finger reflected light and the second finger reflected light is formed by the first light source 421 and the second light source 430 illuminating the finger 410 simultaneously. The first photosensitive region includes a first sub-photosensitive region 4411 and a second sub-photosensitive region 4412, and a first filter selecting a first wavelength and a second filter selecting a second wavelength are disposed above the first sub-photosensitive region 4411 and the second sub-photosensitive region 4412, respectively. In one example, the first light source is at least a portion of a display screen, the display screen is a self-emissive display screen, and the second light source is disposed below the display screen.
Fig. 5A is a schematic side view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. The blood oxygen saturation detection device 540 is disposed below the display screen 520, and the blood oxygen saturation detection device 540 includes:
a photoelectric conversion unit including a first light sensing region 541 and a second light sensing region 542, wherein the photoelectric conversion unit receives a first finger reflected light ray having a first wavelength and a second finger reflected light ray having a second wavelength from above the display screen 520 through the first light sensing region 541 and generates pulse data based on the first finger reflected light ray and the second finger reflected light ray, and wherein the photoelectric conversion unit receives a third finger reflected light ray from above the display screen 520 through the second light sensing region 542 for fingerprint recognition; and a detection unit which detects the blood oxygen saturation of the finger based on the pulse data.
For example, the first, second, and third finger reflected rays may originate from the finger 510.
Fig. 5B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. The first finger reflected light is formed by irradiation of the first light source 531, and the second finger reflected light is formed by irradiation of the second light source 532. The first and second finger reflected light rays are formed by alternately illuminating the finger 510 with the first and second light sources 531, 532. The first light source 531 and the second light source 532 are both disposed below the display screen.
It is to be understood that the arrangement positions of the first light source 531 and the second light source 532 may be arbitrary, and for example, may be arranged at the periphery of the finger-pressing area or the photosensitive area. In one example, in plan view, the second light source 532 (e.g., as shown by the solid circles) and the first light source 531 may be disposed at both sides of the finger-pressing area or the light-sensing area. In another example, in plan view, the second light source 532 (e.g., as shown by the dashed circle) and the first light source 531 may be arranged on the same side of the finger pressing area or the light sensing area, or other peripheral locations.
Fig. 6A is a schematic side view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. The blood oxygen saturation detection device 640 is provided below the display screen 620, and the blood oxygen saturation detection device 640 includes:
the photoelectric conversion unit includes a first photosensitive region 641 and a second photosensitive region 642. The photoelectric conversion unit receives a first finger reflected light ray having a first wavelength and a second finger reflected light ray having a second wavelength from above the display screen through the first photosensitive area 641, and generates pulse data based on the first finger reflected light ray and the second finger reflected light ray, wherein the photoelectric conversion unit receives a third finger reflected light ray from above the display screen through the second photosensitive area 642 for fingerprint recognition; and a detection unit which detects the blood oxygen saturation of the finger based on the pulse data.
For example, the first, second, and third finger reflected rays may come from the finger 610.
Fig. 6B is a schematic plan view of an electronic apparatus including a blood oxygen saturation detection device according to another embodiment of the present invention. The first finger reflection light is formed by irradiation of the first light source 631, and the second finger reflection light is formed by irradiation of the second light source 632. A mixed finger reflected light of the first finger reflected light and the second finger reflected light is formed by the first light source and the second light source simultaneously illuminating the finger 610. The first photosensitive region includes a first sub-photosensitive region 6411 and a second sub-photosensitive region 6412, and a first filter selecting a first wavelength and a second filter selecting a second wavelength are disposed above the first sub-photosensitive region 6411 and the second sub-photosensitive region 6412, respectively. The first light source and the second light source are both arranged below the display screen.
It is to be understood that the arrangement positions of the first light source 631 and the second light source 632 may be arbitrary, and for example, may be arranged at the periphery of the finger-pressing area or the photosensitive area. In one example, in plan view, the second light source 632 (e.g., as shown by the solid circles) and the first light source 631 may be disposed at both sides of the finger-pressing area or the light-sensing area. In another example, in plan view, the second light source 632 (e.g., as shown by the dashed circle) and the first light source 631 may be disposed on the same side of the finger pressing area or the light sensing area, or other peripheral locations.
Fig. 7 is a schematic flow chart of a blood oxygen saturation detection method according to another embodiment of the present invention. As shown in the figure, the first and second,
in step S701, the user starts a blood oxygen saturation detection function such as heart rate detection. Specifically, after the user selects to start the blood oxygen saturation detection function, the user's pressing position is raised in the interface of the application program.
In step S702, the user presses the pulse acquisition area. Specifically, the user can press a finger on the display screen according to the prompted pressing position. The pulse acquisition area can be the same as the fingerprint acquisition area and can also be different from the fingerprint acquisition area.
In step S703, the light spot of the fingerprint sensing area and the infra-red light source under the screen are turned on. Specifically, after the user presses the finger to the fingerprint photosensitive area, the light spot of the fingerprint photosensitive area is immediately lighted up and the infrared LED lamp is lighted, and pulse data acquisition is started.
In step S704, optical fingerprint signals and/or images are continuously acquired. In particular, pulse signals, such as heart rate PPG signature signals, in the red and infrared bands are extracted from the continuously acquired optical fingerprint signals or image data.
In step S705, it is determined whether the number of acquisition frames is greater than N (preset frame number threshold), and if so, the process proceeds to step S706; if not, the process proceeds to step S707.
In step S706, it is determined whether the first wavelength signal and the second wavelength signal are stable in quality, and if so, the process proceeds to step S708, and if not, the process proceeds to step S707.
In step S707, it is determined whether or not the user is holding the press, and if yes, the process proceeds to step S704, and if no, the process proceeds to step S709.
In step S708, based on the pulse signal, such as the heart rate PPG signature, the blood oxygen saturation is calculated. Specifically, the blood oxygen saturation of the current person to be detected is obtained through pulse signals of a red light wave band and an infrared wave band and the ratio of alternating current components to direct current components.
In step S709, a process of the user interface related action is performed.
Fig. 8 is a schematic flow chart of a blood oxygen saturation detection method according to another embodiment of the present invention.
In step S801, the user starts a blood oxygen saturation detection function such as heart rate detection. Specifically, after the user selects to initiate a blood oxygen saturation detection function such as heart rate detection, the user's pressing position is raised in the interface of the application.
In step S802, the user presses the pulse acquisition area. Specifically, the user can press a finger on the display screen according to the prompted pressing position. The pulse acquisition area can be the same as the fingerprint acquisition area and can also be different from the fingerprint acquisition area.
In step S803, the fingerprint sensing area light spot and the off-screen infrared light source are turned on. Specifically, after the user presses the finger to the fingerprint photosensitive area, the light spot of the fingerprint photosensitive area is immediately lighted up and the infrared LED lamp is lighted, and pulse data acquisition is started.
In step S804, after the red light source is turned on to collect one frame of data, the red light source is turned off, and the infrared light source is turned on.
In step S805, after the infrared light source is turned on to collect one frame of data, the infrared light source is turned off, and the red light source is turned on.
In step S806, it is determined whether the number of acquisition frames is greater than N (preset frame number threshold), and if so, the process proceeds to step S807; if not, the process proceeds to step S808.
In step S807, it is determined whether the first wavelength signal and the second wavelength signal are stable in quality, and if so, the process proceeds to step S809, and if not, the process proceeds to step S808.
In step S808, it is determined whether the user is holding the press, and if yes, the process proceeds to step S805, and if no, the process proceeds to step S810.
In step S809, based on the pulse signal, such as the heart rate PPG signature, the blood oxygen saturation is calculated. Specifically, the blood oxygen saturation of the current person to be detected is obtained by the ratio of the pulse signals of the red light and the infrared band to the alternating current component and the direct current component.
In step S810, a process of a user interface-related action is performed.
Fig. 9 is a schematic block diagram of an electronic device of another embodiment of the present invention. As shown in fig. 9, the electronic device 910 includes a display screen 902 and an oxygen saturation detection device 901, and the oxygen saturation detection device 901 is disposed below the display screen 902.
The functions of the respective units and the respective components of the blood oxygen saturation detection device 901 are the same as those of the blood oxygen saturation detection device 210.
Thus, particular embodiments of the present subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may be advantageous.
In the 90 s of the 20 th century, improvements in a technology could clearly distinguish between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Furthermore, nowadays, instead of manually manufacturing an integrated circuit chip, such programming is mostly implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, and the original code before compiling is also written by a specific programming Language, which is called Hardware Description Language (HDL), and the HDL is not only one but many, such as abel (advanced Boolean Expression Language), AHDL (advanced Hardware Description Language), etc
(Altera Hardware Description Language), Confluence, CUPL (Central University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALSM, RHDL (Ruby Hardware Description Language), etc., with VHDL (Very-High-Speed Integrated Circuit Hardware Description Language) and Verilog being most commonly used at present. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.
The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic for the memory. Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may thus be considered a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular transactions or implement particular abstract data types. The invention may also be practiced in distributed computing environments where transactions are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (14)
1. An oxyhemoglobin saturation detection device, disposed below a display screen, the device comprising:
a photoelectric conversion unit including a first light sensing area, wherein the photoelectric conversion unit receives a first finger reflected light ray having a first wavelength and a second finger reflected light ray having a second wavelength from above the display screen through the first light sensing area, and generates pulse data based on the first finger reflected light ray and the second finger reflected light ray,
and the detection unit is used for detecting the blood oxygen saturation of the finger based on the pulse data.
2. The device of claim 1, wherein the first finger reflected light is formed by illumination from a first light source and the second finger reflected light is formed by illumination from a second light source.
3. The device of claim 2, wherein a mixed finger reflected light of the first finger reflected light and the second finger reflected light is formed by the simultaneous illumination of the finger by the first light source and the second light source,
the first photosensitive area comprises a first sub-photosensitive area and a second sub-photosensitive area, and a first filter for selecting the first wavelength and a second filter for selecting the second wavelength are arranged above the first sub-photosensitive area and the second sub-photosensitive area respectively.
4. The device of claim 2, wherein the first and second finger reflected light rays are formed by alternately illuminating a finger with the first and second light sources.
5. The apparatus of claim 3 or 4, wherein the first light source is at least a portion of the display screen, the display screen is a self-emissive display screen, and the second light source is disposed below the display screen.
6. The apparatus of claim 3 or 4, wherein the first light source and the second light source are both disposed below the display screen.
7. The device of claim 1, wherein the detection unit is disposed below or beside the photoelectric conversion unit, and the photoelectric conversion unit and the detection unit are integrally packaged into a chip or a module.
8. The apparatus of claim 1, wherein the photoelectric conversion unit further includes a second photosensitive region through which the photoelectric conversion unit receives a third finger reflected light from above the display screen and generates fingerprint data based on the third finger reflected light, the apparatus further comprising:
and a fingerprint identification unit for performing fingerprint identification based on the fingerprint data.
9. The device of claim 8, wherein the detection unit and the fingerprint identification unit are both disposed below or at a side of the photoelectric conversion unit, wherein the photoelectric conversion unit, the detection unit and the fingerprint identification unit are integrally packaged into a chip or a module.
10. The apparatus according to claim 1, wherein the detection unit is specifically configured to:
extracting, based on the pulse data, a pulse signal corresponding to the first wavelength and a pulse signal corresponding to the second wavelength;
calculating the respective AC-DC proportional relationship of the pulse signal with the first wavelength and the pulse signal with the second wavelength, wherein the AC-DC proportional relationship indicates the proportion between the signal AC component and the signal DC component;
and the detection module detects the blood oxygen saturation of the finger according to the respective AC-DC proportional relation.
11. The apparatus according to claim 10, wherein the detection unit is specifically configured to:
acquiring the pulse data based on a preset frame rate to obtain a pulse signal corresponding to the first wavelength and a pulse signal corresponding to the second wavelength;
determining average signal characteristics of the pulse signals of the first wavelength and the second wavelength based on the preset frame rate respectively;
and calculating the respective AC-DC proportional relation between the pulse signal with the first wavelength and the pulse signal with the second wavelength according to the average signal characteristic.
12. The device of any of claims 1-11, wherein the first wavelength is in a red band of wavelengths and the second wavelength is in an infrared band of wavelengths.
13. The device of claim 12, wherein the third finger reflects light at a wavelength less than the red wavelength band.
14. An electronic device, comprising:
a display screen;
the oximetry device of any one of claims 1-13 disposed below the display screen.
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