CN218128519U - Biological characteristic information detection device and electronic equipment - Google Patents

Abstract

The application provides a biological characteristic information detection device and electronic equipment, relate to and show technical field, biological characteristic information detection device is used for setting up in the display screen below, including biological characteristic information detection light source, light-directing structure and sensor, light-directing structure is used for setting up between the light-emitting side and the display screen of biological characteristic information detection light source, the detection light that biological characteristic information detection light source outgoing incides light-directing structure through the income plain noodles of light-directing structure, and by light-directing structure direction to play plain noodles outgoing to the display screen, shine the detection light that reflects back behind the detected object of display screen top and receive by the sensor. The biological characteristic information detection device and the electronic equipment can effectively reduce scattering in the light beam receiving and sending process in the biological characteristic information detection under the screen, and reduce noise formed by specular reflection of scattered light on the screen, thereby being beneficial to improving the accuracy of the biological characteristic information detection device and the electronic equipment in the biological characteristic information detection.

Description

Biological characteristic information detection device and electronic equipment

Technical Field

The application relates to the technical field of display, in particular to a biological characteristic information detection device and electronic equipment.

Background

With the rapid development of terminal electronic equipment intellectualization which is dominated by a handheld mobile terminal, other functions integrated on the electronic equipment are more and more, and the application range is wider and more.

The application of the human body biological characteristic information recognition in the electronic equipment is more and more deep and wide, and the electronic equipment is awakened through the biological characteristic information recognition unlocking in the past, and the identity recognition, the identity authentication and the like of various software programs are gradually developed. With the same concern of people on healthy life, further needs have been raised for electronic products, especially wearable and detachable electronic products, for example, the wearable and detachable electronic products can directly acquire and output the current body state parameters of the user, and monitor pulse, blood pressure, blood oxygen, etc. in real time.

In the prior art, biometric information identification applied to electronic devices such as mobile phones and tablet computers is performed, for example, heart rate monitoring is performed, an LED light source is usually adopted to irradiate the skin of a wearing place of an electronic product, a sensor for receiving an optical signal is further disposed on the electronic device, the sensor receives the optical signal carrying the biometric information reflected by the skin, and a control terminal extracts the biometric information in the optical signal to perform processing operation, so as to obtain a detection value of a current heart rate. However, most of the electronic devices have a mirror surface reflecting light beam under the screen, so that the light beam emitted from the electronic device to the skin of the wearing part is less, and the detected data is prone to generate larger deviation or error due to the light noise generated by the scattering of the light beam under the screen in the transceiving process and the influence of the noise of the physiological activity of the human body.

SUMMERY OF THE UTILITY MODEL

An object of the embodiments of the present application is to provide a biometric information detection apparatus and an electronic device, which can effectively reduce scattering during light beam transceiving during biometric information detection under a screen, and reduce noise caused by specular reflection of scattered light on the screen, thereby facilitating improvement of accuracy of the biometric information detection apparatus and the electronic device in biometric information detection.

The embodiment of the application provides a biological characteristic information detection device, be used for setting up in the display screen below, biological characteristic information detection device includes biological characteristic information detection light source, light-directing structure and sensor, light-directing structure is used for setting up between the light-emitting side of biological characteristic information detection light source and display screen, the detection light that biological characteristic information detection light source outgoing incides light-directing structure through light-incoming face of light-directing structure, and by light-directing structure direction to play plain noodles and go out to the display screen, shine the detection light that reflects back behind the detection object of display screen top and receive by the sensor.

Optionally, an included angle is formed between a line connecting the center of the light incident surface and the center of the light emitting surface of the light guide structure and a straight line perpendicular to the display screen.

Optionally, the main light path of the detection light in the light guide structure has an angle with a straight line perpendicular to the display screen, or the main light path of the detection light in the light guide structure is perpendicular to the display screen.

Optionally, the light guiding structure is a columnar light guiding body, and the light incident surface and the light exiting surface of the light guiding structure are respectively located on a top surface and a bottom surface of the columnar light guiding body.

Optionally, a cross-sectional dimension of the light incident surface of the columnar light guide is smaller than or equal to a cross-sectional dimension of the light emergent surface.

Optionally, the cross-sectional shape of the columnar light guide is circular or elliptical, the diameter of the light incident surface of the columnar light guide is equal to the maximum diagonal length of the effective light emitting area of the biometric information detection light source, and the light incident surface of the columnar light guide is attached to the biometric information detection light source.

Optionally, the columnar light guide is a solid structure, and the side wall of the columnar light guide is a total reflection surface.

Optionally, an included angle is formed between the light emitting surface of the columnar light guide body and the plane where the display screen is located, and the height of the light emitting surface of the columnar light guide body is gradually reduced from the side away from the sensor to the side close to the sensor.

Optionally, the light emitting surface of the columnar light guide body is an inner concave surface.

Optionally, a diffusion film is disposed on the light emitting surface of the columnar light guide body.

Optionally, the columnar light guide body is a hollow structure, and the inner side wall of the columnar light guide body is provided with a reflective layer.

Optionally, a first concave lens is disposed on the light exit surface of the columnar light guide body.

Optionally, a dodging module is disposed between the display screen and the receiving side of the sensor.

Optionally, the dodging module comprises a second concave lens.

Optionally, the diameter of the second concave lens is greater than or equal to the width of the receiving surface of the sensor.

Optionally, the dodging module further comprises a converging lens, and the detection light reflected back after being irradiated to the detection object above the display screen is received by the sensor after sequentially passing through the converging lens and the second concave lens.

Optionally, the diameter of the converging lens is equal to or greater than the diameter of the second concave lens.

Optionally, the light uniformizing module further comprises a fixing frame fixedly arranged on the sensor, and the converging lens and the second concave lens are fixedly arranged on the fixing frame at intervals.

Optionally, the biometric information detection light source comprises an infrared LED and/or a red LED.

Optionally, the biometric information detection light source includes an infrared LED and a red LED, and the infrared LED and the red LED are respectively disposed on two opposite sides of the sensor at an interval.

Optionally, the infrared LEDs and the red LEDs are respectively provided in a plurality, and the plurality of infrared LEDs and the plurality of red LEDs are arranged around the periphery of the sensor at intervals.

Optionally, the edge distance between the infrared LED and/or the red LED and the sensor is between 2 and 2.5mm, and when the biometric information detection light source comprises the infrared LED and the red LED, the adjacent two infrared LEDs, the adjacent two red LEDs, and/or the edge distance between the adjacent infrared LED and the red LED is between 2 and 2.5 mm.

In another aspect of the embodiments of the present application, an electronic device is provided, which includes a display screen and a biometric information detection device according to any one of the foregoing items, where the biometric information detection device is disposed below the display screen.

Optionally, the electronic device further includes a controller electrically connected to the sensor, and the controller extracts and calculates the detected light reflected back after being irradiated to the detection object above the display screen to obtain the biometric information.

Optionally, a biometric information identification area is preset on the display screen, and the biometric information detection light source and the sensor are located within a projection range of the biometric information identification area.

The embodiment of the application provides a biological characteristic information detection device, be used for setting up in the display screen below, biological characteristic information detection device includes biological characteristic information detection light source, light-guiding structure and sensor, light-guiding structure is used for setting up between the play optical side and the display screen of biological characteristic information detection light source, detection light that biological characteristic information detection light source outgoing passes through the light-guiding effect of light-guiding structure, go out to the display screen by the play optical surface of light-guiding structure after the income of light-guiding structure is incident, detection light that goes out by the display screen is in the display screen again after the skin reflection of wearing department, the detection light that shines back to the detection object is received by the sensor, because of the guide effect of light-guiding structure, can make detection light that biological characteristic information detection light source outgoing more accurate guide to the effective detection area scope of display screen, reduce the scattering of detection light in the display screen, make the detection light in the effective detection scope on the display screen comparatively concentrated, also can reduce some reflection of light surface on the display screen to the mirror reflection of detection light problem, thereby the effectual optical noise that reduces in biological characteristic information detection process and the noise that human physiology activity produced, improve biological characteristic information detection device and electronic equipment are accurate to biological characteristic information.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present application;

fig. 2 is a second schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present disclosure;

fig. 3 is a third schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present application;

fig. 4 is a fourth schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present application;

fig. 5 is a simplified schematic top view of a biometric information detection apparatus provided in an embodiment of the present application;

fig. 6 is a fifth schematic structural view of a biometric information detection apparatus according to an embodiment of the present application;

fig. 7 is a sixth schematic structural view of a biometric information detection apparatus according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a biometric information detection light source and a light guide structure in a biometric information detection apparatus according to an embodiment of the present disclosure;

fig. 9 is a seventh schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present application;

fig. 10 is an eighth schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present application;

fig. 11 is a schematic diagram illustrating an arrangement position relationship between a sensor and a biometric information detection light source in a top view direction of a biometric information detection apparatus according to an embodiment of the present application.

An icon: 30-a display screen; 40-a biometric information detection light source; 50-a sensor; 60-a light guide structure; 61-a diffusion membrane; 62-a light-reflecting layer; 70-a first concave lens; 80-a light homogenizing module; 81-a second concave lens; 82-a converging lens; the included angle between the connecting line of the center of the light incident surface and the center of the light emergent surface of the alpha-light guide structure and a straight line vertical to the display screen; an included angle between the light-emitting surface of the beta-columnar light guide body and the plane where the display screen is located; h-height of the light-emitting surface of the columnar light guide body; l1-the edge spacing of the light source and the sensor is detected by the biological characteristic information; l2-the edge distance between two adjacent biological characteristic information detection light sources; u1-the cross-sectional dimension of the light incident surface of the columnar light guide; u2 is the cross-sectional dimension of the light-emitting surface of the columnar light guide body.

Detailed Description

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

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the product of the application is usually placed in when used, and are used only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The biometric information recognition such as fingerprint recognition or biometric detection such as pulse measurement applied under the display screen needs to be realized by receiving, recording or analyzing reflected light carrying specific biometric information, and the integration of an optical module for biometric information recognition on the OLED display panel has become a common technique in the field. However, because the cover plate of the display screen is usually made of glass or other smooth and transparent materials, light beams emitted by a light source for biological characteristic detection can be scattered under the display screen and can be subjected to specular reflection in the display screen, the scattered and specular reflected light beams can cause relatively large noise in light reflection signals received by the sensor, and meanwhile, physiological movement noise can be caused to the light reflection signals during human physiological movement, which is difficult to avoid.

In order to solve the above problem, an aspect of the embodiment of the present invention provides a biometric information detection apparatus, fig. 1 is one of the schematic structural diagrams of the biometric information detection apparatus provided in the embodiment of the present invention, as shown in fig. 1, the biometric information detection apparatus is configured to be disposed below a display screen 30, the biometric information detection apparatus includes a biometric information detection light source 40, a light guide structure 60 and a sensor 50, the light guide structure 60 is configured to be disposed between a light emitting side of the biometric information detection light source 40 and the display screen 30, detection light emitted from the biometric information detection light source 40 enters the light guide structure 60 through a light incident surface of the light guide structure 60 and is guided to a light emitting surface by the light guide structure 60 to be emitted to the display screen 30, and detection light reflected back after being irradiated to a detection object above the display screen 30 is received by the sensor 50.

The display screen is used for realizing corresponding functions of data display or image display required by the electronic equipment, a biological characteristic information detection light source 40 and a sensor 50 are arranged below the display screen, the biological characteristic information detection light source 40 emits detection light for detecting biological characteristic information, the light guide structure 60 guides the detection light emitted by the biological characteristic information detection light source 40 to the display screen 30, the detection light is emitted to the display screen 30 from a light emitting surface of the light guide structure 60, the detection light is incident from the display screen 30 again after being reflected by shielding at a wearing position of a user on the display screen 30, and after the reflected detection light is incident to the sensor 50, the sensor 50 processes, analyzes and calculates the received detection light, so that corresponding biological characteristic information, such as heart rate, blood oxygen, pressure value and the like, can be obtained through extracted changes of fluctuation and the like of the skin at the wearing position due to pulse.

While the detection light for detecting the biometric information in the embodiment of the present application is provided by the biometric information detection light source 40, the detection light for detecting the biometric information may be infrared light, or may be visible light, wherein red light or green light is often used in the visible light.

If the light guide structure 60 is not provided, the detection light emitted from the biometric information detection light source 40 is scattered within the light-emitting angle range of the biometric information detection light source 40, and because there is still a certain distance between the biometric information detection light source 40 and the display screen 30, the scattering of the detection light received on the display screen 30 is severe, and the angle difference of the light incident on the display screen 30 is also large, which further causes the mirror reflection in the display screen 30 to be severe. Therefore, the light guide structure 60 is provided to guide the direction of the detection light emitted from the biometric information detection light source 40 so that the range of the area on the display screen 30 irradiated with the detection light is relatively concentrated, and also to restrict the angle of the detection light irradiated on the display screen 30 to a certain degree, thereby reducing the problem of specular reflection. The shape and structure of the light guide structure 60 are not specifically limited in the embodiment of the present application, as long as the detection light can be guided to the preset area at the display 30, and the angle of the detection light irradiated on the display 30 is limited to a certain degree, so that the detection light reflected by the skin covered on the display 30 in the preset area can enter the sensor 50 as much as possible, and the stray light entering the sensor 50 is reduced, so as to improve the intensity of the detection light received in the sensor 50 and reduce the noise reception, thereby improving the accuracy of the detection of the biometric information.

It should be noted that the sensor 50 may be a photodiode (PD tube), and the photodiode is a semiconductor device composed of a PN junction, has a unidirectional conductive characteristic, and is a photoelectric sensor capable of converting an optical signal into an electrical signal. The sensor 50 receives the reflected detection light carrying the biometric information and converts the detection light into an electrical signal, and the corresponding biometric information can be obtained from the electrical signal through extraction, analysis and calculation. Of course, in the embodiment of the present application, the specific embodiment of the sensor 50 is not limited, and any device may be used as long as it can convert an optical signal into an electrical signal.

The biometric information detection device provided by the embodiment of the application is arranged below the display screen 30 and comprises a biometric information detection light source 40, a light guide structure 60 and a sensor 50, wherein the light guide structure 60 is arranged between the light emitting side of the biometric information detection light source 40 and the display screen 30, detection light emitted by the biometric information detection light source 40 passes through the light guide effect of the light guide structure 60, the detection light is emitted to the display screen 30 from the light emitting surface of the light guide structure 60 after being incident from the light incident surface of the light guide structure 60, the detection light emitted from the light emitting side of the display screen 30 is reflected by skin at the wearing position and then is incident to the display screen 30 again, the detection light reflected back after being irradiated to a detection object is received by the sensor 50, due to the guiding effect of the light guide structure 60, the detection light emitted by the biometric information detection light source 40 can be accurately guided to the effective detection area range of the display screen 30, scattering of the detection light in the display screen is reduced, the detection light in the effective detection range on the display screen 30 is concentrated, the mirror reflection problem of some light reflecting surfaces on the detection light can be reduced, and the biometric information and the detection accuracy of the biometric information and the detection device for the biometric information, and the detection of the biometric information, and the biometric information detection device, and the detection accuracy of the detection device for the detection of the biometric information can be improved.

Optionally, fig. 2 is a second schematic structural diagram of the biometric information detection apparatus provided in the embodiment of the present application, and as shown in fig. 2, an included angle α is formed between a line connecting the center of the light incident surface and the center of the light emitting surface of the light guide structure 60 and a straight line perpendicular to the display screen 30.

The sensor 50 receives the detection light emitted from the biometric information detection light source 40 and reflected back by the detection object on the display screen 30, and the biometric information detection light source 40 and the sensor 50 are disposed at an interval, so that, if the detection light emitted from the biometric information detection light source 40 is perpendicular to the display screen 30, a part of the light beam reflected by the cover on the display screen 30 returns to the biometric information detection light source 40 without entering the sensor 50, and therefore, the light beam emitted from the biometric information detection light source 40 onto the display screen 30 needs to have a certain inclination angle, as shown in fig. 2, an included angle α is formed between a line connecting the center of the light incident surface and the center of the light emergent surface of the light guide structure 60 and a straight line perpendicular to the display screen 30, so that the area position of the detection light guided by the light guide structure 60 and irradiated on the display screen 30 can be shifted toward one side of the sensor 50 by some distance, and more detection light carrying biometric information can enter the sensor 50.

As shown in fig. 2, in the biometric information detection apparatus shown in fig. 2, only one biometric information detection light source 40 is provided, and in general, the light guide structure 60 is set to have an included angle α that inclines the detection light toward the sensor 50, so that the reflected detection light can be translated a certain distance toward the sensor 50, but the present embodiment is not limited thereto, and if a plurality of biometric information detection light sources 40 are provided under the display 30 and surround the sensor 50, the inclined included angle α between the line connecting the center of the light incident surface and the center of the light emitting surface of the light guide structure 60 on the plurality of biometric information detection light sources 40 and the line perpendicular to the display 30 may also be set to have other inclined directions.

Alternatively, the main light path of the detection light in the light guide structure 60 has an angle with a straight line perpendicular to the display screen 30, or the main light path of the detection light in the light guide structure 60 is perpendicular to the display screen 30.

It should be understood that the sensing light is transmitted in the light guiding structure 60, which means that the sensing light is incident from the light incident surface of the light guiding structure 60 and is transmitted inside the light guiding structure 60, and in this transmission process, the transmission process of the partial light beams at the edge position inside the light guiding structure 60 may include reflection and refraction, and is finally transmitted to the light emitting surface of the light guiding structure 60 to be emitted, although the sensing light is not necessarily transmitted directly from the light incident surface to the light emitting surface in the light guiding structure 60, when the sensing light is regarded as a whole, the transmission of the sensing light inside the light guiding structure 60 necessarily includes the transmission direction of a main light path. The main light path of the detection light in the light guide structure 60 may be set to have an angle with a straight line perpendicular to the display screen 30, or may also be set to have the main light path of the detection light in the light guide structure 60 perpendicular to the display screen 30.

Alternatively, as shown in fig. 3, the light guiding structure 60 is a columnar light guiding body, and the light incident surface and the light emitting surface of the light guiding structure 60 are respectively located on the top surface and the bottom surface of the columnar light guiding body.

Light-directing structure 60 sets up to the column light guide body, and make the income plain noodles and the play plain noodles of column light guide body be top surface and bottom surface respectively, the lateral wall of column light guide body does not go out the light, the detection light of inciding by the bottom surface of column light guide body, only can guide to the top surface outgoing through the direction of height of column light guide body, so, can effectually avoid detecting the light and take place the scattering under the screen on the one hand, on the other hand, also can be through the setting of the shape and the size of the bottom surface and the top surface of column light guide body as far as possible with the light-emitting restraint of detecting the light in the required region scope of predetermineeing of display screen 30 department.

It should be noted that, there are various ways of making the side wall of the columnar light guide body not emit light, a light reflecting film layer or a light absorbing film layer may be provided to avoid scattering caused by light emitted from the side wall, and a total reflection structure may also be adopted, which is not specifically limited in the embodiment of the present application.

Alternatively, as shown in fig. 4, the cross-sectional dimension U1 of the light incident surface of the columnar light guide is smaller than or equal to the cross-sectional dimension U2 of the light emergent surface.

Since the light incident surface of the cylindrical light guide is used for matching with the light emergent side of the biometric information detection light source 40, and particularly, is matched with the effective light emitting area of the biometric information detection light source 40, so as to ensure that the detection light emitted from the biometric information detection light source 40 can enter the cylindrical light guide and be guided by the cylindrical light guide as much as possible, when the detection light enters the cylindrical light guide from the light incident surface of the cylindrical light guide, since the side wall of the cylindrical light guide is opaque, the detection light is reflected even if contacting the side wall of the cylindrical light guide, the detection light can only pass through the light emergent surface of the cylindrical light guide and be emitted towards the human skin covered on the display 30 at a specific area of the display 30, in order to enable the reflected detection light to carry as much biometric information as possible, the detection light emitted to the human skin needs to be irradiated in a larger range, as shown in fig. 4, the cross-sectional dimension U1 of the light incident surface of the cylindrical light guide is smaller than or equal to the cross-sectional dimension U2 of the light emergent surface, so that the cross-sectional dimension U2 of the light emergent surface can be set as large as required, so that the light emergent light has a larger light emitting surface, which is beneficial for obtaining a more accurate detection of the biometric information.

Alternatively, as shown in fig. 5, the cross-sectional shape of the columnar light guide is circular or elliptical. The diameter of the light incident surface of the columnar light guide is equal to the maximum diagonal length of the effective light emitting area of the biometric information detection light source 40, and the light incident surface of the columnar light guide is attached to the biometric information detection light source 40.

The light incident surface of the cylindrical light guide body is attached to the biometric information detection light source 40 to prevent the detection light emitted from the biometric information detection light source 40 from scattering under the screen before entering the cylindrical light guide body, and in the biometric information detection apparatus, although there is a gap between the biometric information detection light source 40 and the sensor 50, the distance is still very short, if the detection light emitted from the biometric information detection light source 40 is directly scattered to the sensor 50 to be received, the interference of an invalid light source is caused to the sensor 50, and the detection accuracy of the biometric information is affected.

The diameter of the light incident surface of the columnar light guide is equal to the maximum diagonal length of the effective light emitting area of the biometric information detection light source 40, that is, as shown in fig. 5, when the cross-sectional shape of the columnar light guide is a circle, the circle is a circumscribed circle of the effective light emitting area of the biometric information detection light source 40, for example, in fig. 5, the effective light emitting area of the biometric information detection light source 40 is a rectangle, and when the length and width of the rectangle are 4mm and 3mm, respectively, the diameter of the columnar light guide is 5mm. This ensures that as much of the detection light emitted from the effective light-emitting area of the biometric information detection light source 40 enters the columnar light guide and is guided, and the effective light-emitting area of the biometric information detection light source 40 shown in fig. 5 is rectangular (the rectangular area filled with gray dots in fig. 5 is the effective light-emitting area of the biometric information detection light source 40), and if the effective light-emitting area is of another shape, the boundary of the light-incident surface of the columnar light guide may completely cover the entire effective light-emitting area as much as possible.

Optionally, the columnar light guide is a solid structure, and the side wall of the columnar light guide is a total reflection surface.

In an implementation of the present application, the columnar light guide may be a solid structure, and the sidewall of the columnar light guide is a total reflection surface, for example, the columnar light guide of the solid structure is made of a transparent acrylic material which is the same as a light guide plate commonly used for a lateral light source in a passive light emitting display, and the sidewall of the columnar light guide further ensures that the light beam passing through the inside is reflected back to the inside of the columnar light guide due to total reflection when being irradiated onto the sidewall by polishing, so that when the detection light is incident from the bottom surface of the columnar light guide, the light beam can be totally guided to the top surface of the columnar light guide to exit. The light guiding process is only related to the positions and angles of the incident bottom surface and the emergent top surface of the columnar light guide body, and a person skilled in the art can design the columnar light guide body into a straight column, an inclined column or a distorted column with other shapes according to actual needs. In addition, a dark light-absorbing material layer may be further disposed on the outer sidewall of the solid-structured columnar light guide body, so as to further thoroughly avoid the bad ineffective light influence on the sensor 50 caused by the light beam that may escape from the sidewall of the columnar light guide body.

Optionally, as shown in fig. 6, an included angle β is formed between the light emitting surface of the columnar light guide and the plane where the display screen 30 is located, and the height H of the light emitting surface of the columnar light guide gradually decreases from the side away from the sensor 50 to the side close to the sensor 50.

Because the heights of the light-emitting surfaces of the columnar light guide bodies are different at each position, an included angle beta is formed between the light-emitting surfaces of the whole columnar light guide bodies and the plane where the display screen 30 is located, the height H of the light-emitting surfaces of the columnar light guide bodies is higher at the side far away from the sensor 50, and the height H of the light-emitting surfaces of the light guide bodies is lower at the side close to the sensor 50, so that the included angle beta is formed, the light detected by the columnar light guide bodies can be inclined towards the sensor 50, the whole outgoing direction of the light detected by the columnar light guide bodies has the tendency of inclining towards the sensor 50, the reflecting direction of the light detected after the light irradiates the skin on the display screen 30 is towards the position of the sensor 50 as far as possible, and the sensor 50 can receive more light carrying biological characteristic information in a limited range.

For example, when the biometric information detection apparatus according to the embodiment of the present application is applied to an electronic device to detect a heart rate of a wearer, the electronic device is worn on a wrist of the wearer, and a skin of the wrist is usually closely attached to a preset detection position on the display screen 30, so that a slight angle formed between the skin of the wrist and the display screen 30 can be ignored, and in general, an emitting direction and a reflecting direction of a light beam are symmetric about a normal line where a reflecting surface is located, so that the detection light irradiates the skin of the wrist at an oblique angle, and the reflected detection light also enters the display screen 30 at a symmetric angle, and a person skilled in the art can set an included angle β between a light emitting surface of the columnar light guide and a plane where the display screen 30 is located according to requirements of an application occasion and parameters such as a setting distance between the biometric information detection light source 40 and the sensor 50 under the display screen 30, so that as much of the reflected detection light can accurately enter the sensor 50 under the same condition.

Optionally, as shown in fig. 7, the light emitting surface of the columnar light guide is an inner concave surface.

The light-emitting surface of the columnar light guide body is arranged to be an inner concave surface, so that the detection light can be emitted through the light-emitting surface of the columnar light guide body and is uniformly distributed, the detection light emitted to the display screen 30 is irradiated in a preset area range, light distribution at each position in the area range is uniform, the uniform irradiation of human skin in the preset area range is guaranteed as far as possible, and the reflected detection light can carry biological characteristic signals comprehensively and accurately.

Optionally, a diffusion film 61 is disposed on the light exit surface of the columnar light guide.

As shown in fig. 7, the diffusion film 61 can diffuse the transmitted light beam well, and the diffusion film 61 is further disposed on the columnar light guide body with the concave light-emitting surface, so that the emitted detection light can be diffused under the uniform light effect of the concave surface, and the range of the emitted detection light irradiated on the preset region is enlarged to some extent, and the irradiation within the range is uniform.

Alternatively, as shown in fig. 8, the columnar light guide body is a hollow structure, and the inner side wall of the columnar light guide body is provided with a reflective layer 62.

As shown in fig. 8, in another realizable embodiment of the present application, the columnar light guiding body may be further configured to be a hollow structure, that is, a hollow cylinder, and the detection light is incident from one side opening of the columnar light guiding body and emitted from the other side opening, wherein a reflective layer 62 is further disposed on an inner side wall of the columnar light guiding body, and the reflective layer 62 can reflect the light beam irradiated thereon, especially when the columnar light guiding body is in a non-straight column state, part of the detection light is irradiated to the side wall of the columnar light guiding body due to the linear propagation of the light, and the detection light is reflected back into the columnar light guiding body due to the reflection of the reflective layer 62 until being emitted to the other side opening, so that the detection light is hardly lost inside the columnar light guiding body, and the detection light incident from the one side opening can be emitted to the preset area range of the display screen 30 from the other side opening.

It should be noted that, on the basis of this, a dark light-absorbing material layer may be further disposed on the outer side wall of the hollow-structure cylindrical light guide body, so as to further thoroughly avoid the adverse ineffective light influence on the sensor 50 caused by the light beam that may escape from the side wall of the cylindrical light guide body.

Optionally, as shown in fig. 8, a first concave lens 70 is disposed on the light emitting surface of the columnar light guide.

When the columnar light guide body is a hollow cylindrical structure, a first concave lens 70 may be further disposed on the light exit surface of the columnar light guide body, so that the detection light emitted from the opening on the other side of the columnar light guide body can exit after passing through the uniform light diffusion effect of the first concave lens 70.

It should be noted that, as will be understood by those skilled in the art, the first concave lens 70 capable of performing the light uniformizing and diffusing function is not limited to the plano-concave lens shown in fig. 8, and the concave surface thereof may be disposed on the lower side, or may be a double concave lens, which is not particularly limited in the embodiment of the present invention, as long as the form of the concave lens is adopted so that the detection light emitted from the other side opening of the columnar light guide body can be emitted after performing the light uniformizing and diffusing function.

Optionally, as shown in fig. 9, a dodging module 80 is disposed between the display screen 30 and the receiving side of the sensor 50.

As shown in fig. 9, a dodging module 80 is further disposed between the display 30 and the receiving side of the sensor 50, and the reflected detection light is emitted toward the sensor 50 and is received by the sensor 50 more uniformly after being diffused by the dodging module 80.

It should be noted that the dodging module 80 is used for dodging and diffusing the detection light to be received by the sensor 50, so as to enable the detection light entering the sensor 50 to cover the whole receiving surface of the sensor 50 as much as possible to be received, and enable the distribution of the detection light on the whole receiving surface to be as uniform as possible, so as to avoid local concentration, thereby improving the working efficiency of the sensor 50. In this embodiment, the dodging module 80 may be a combined structure composed of a plurality of optical elements, or may be a single optical element, which is not specifically limited in this embodiment, and in addition, the structural size of the dodging module 80 is also not specifically limited in this embodiment, and those skilled in the art may specifically design the dodging module according to actual requirements by referring to parameter settings required by the optical elements.

Alternatively, as shown in fig. 9, the dodging module 80 includes a second concave lens 81.

The second concave lens 81 is disposed on the receiving side of the sensor 50, and the second concave lens 81 is schematically illustrated in fig. 9, and a person skilled in the art should understand that the second concave lens 81 capable of performing the light uniformizing and diffusing function is not limited to the shape shown in fig. 9, and the concave lens may be a flat concave lens, and the concave surface may be disposed on the upper side or the lower side, or may be a double concave lens, which is not particularly limited in the embodiment of the present invention.

Alternatively, as shown in fig. 9, the diameter of the second concave lens 81 is equal to or larger than the receiving surface width of the sensor 50.

Since the outer periphery of the receiving surface of the sensor 50 generally has other edge structures for not receiving the detection light, the diameter of the second concave lens 81 may be equal to the width of the receiving surface of the sensor 50, or may be set to be appropriately larger than the width of the receiving surface of the sensor 50, as long as the boundary range of the detection light after being homogenized and diffused is made as large as possible within the range of the receiving surface of the sensor 50.

Optionally, as shown in fig. 10, the dodging module 80 further includes a converging lens 82, and the detection light reflected back after being irradiated to the detection object above the display screen 30 passes through the converging lens 82 and the second concave lens 81 in sequence and is received by the sensor 50.

As shown in fig. 10, the directions of the detection light reflected back after being irradiated to the detection object above the display screen 30 are relatively random, the reflected detection light is firstly shaped and converged by the converging lens 82 so that the transmission directions of the detection light are correspondingly concentrated, and then is homogenized and diffused by the second concave lens 81, so that the reflected detection light is firstly collected as intensively as possible, and then is incident on the sensor 50 after being homogenized, and the sensor 50 can uniformly receive more detection light on the receiving surface.

Alternatively, the diameter of the condensing lens 82 is equal to or larger than the diameter of the second concave lens 81.

Since the converging lens 82 is used for shaping and converging the reflected detection light, and the light beams enter the converging lens 82 and then converge and exit into the second concave lens 81, the diameter of the converging lens 82 may be set to be equal to the diameter of the second concave lens 81, or the diameter of the converging lens 82 may be set to be slightly larger than the diameter of the second concave lens 81, so that the converging lens 82 collects as much reflected detection light as possible in a range as large as possible.

The converging lens 82 is used to shape and converge the reflected detection light so as to collect as much reflected detection light as possible in an area as large as possible under the display screen 30, and therefore, the form of the converging lens 82 is not limited to the biconcave lens illustrated in fig. 10, and may also be, for example, a horn-shaped optical element having a large light inlet on a side close to the display screen 30 to receive as much detection light as possible and a light outlet matching the size of the second concave lens 81 on a side away from the display screen 30 to transmit the detection light in abutment with the second concave lens 81.

Optionally, the dodging module 80 further includes a fixing frame fixedly disposed on the sensor 50, and the focusing lens 82 and the second concave lens 81 are fixedly disposed on the fixing frame at intervals.

When the light uniformizing module 80 comprises a plurality of optical elements such as the second concave lens 81 and the converging lens 82, the light uniformizing module 80 further comprises a fixing frame for bearing and installing and fixing the optical elements, the fixing frame is fixedly arranged on the sensor 50, so that the relative position between the whole light uniformizing module 80 and the sensor 50 is ensured to be stable, the optical elements such as the second concave lens 81 and the converging lens 82 are sequentially fixed on the fixing frame at intervals, and the fixed arrangement sequence, the interval distance and the like are installed and configured according to the parameter requirements of the optical elements.

Optionally, the biometric information detection light source 40 includes an infrared LED and/or a red LED.

The light source 40 for detecting biometric information may be an infrared light source, such as an infrared LED, which emits infrared detection light toward a predetermined area range on the display screen 30, the reflected infrared light is received by the sensor 50, and the infrared light has strong penetrability and high efficiency for detecting biometric information, or may include a light source for detecting visible light, such as a red LED, which is common to light sources for detecting visible light, and may also adopt visible light of other wavelengths, such as green light, besides red light.

In addition, the biometric information detection light source 40 may only include a red light LED, only include an infrared LED, or may also include both a red light LED and an infrared LED, for example, when the biometric information detection apparatus according to the embodiment of the present application is applied to an electronic device to detect a real-time heart rate of a wearer, only one red light LED or one infrared LED may be set as the biometric information detection light source 40, at this time, a heart rate value can be calculated by the reflected detection light collected by the sensor 50, if the biometric information detection apparatus according to the embodiment of the present application is applied to an electronic device to detect a relatively complex physiological index such as a blood oxygen content of the wearer, usually, at least the red light LED and the infrared LED need to be set simultaneously, and if necessary, a plurality of red light LEDs or a plurality of infrared LEDs may also be set to improve the light output power of the biometric information detection light source 40, improve the detection efficiency of the detection light, and improve the accuracy of the detection of the complex physiological index.

Optionally, the biometric information detection light source 40 includes an infrared LED and a red LED, which are respectively disposed at intervals on two opposite sides of the sensor 50.

As shown in fig. 10, when the biometric information detection light source 40 includes an infrared LED and a red LED, the infrared LED and the red LED are disposed at intervals on two opposite sides of the sensor 50, and the infrared LED and the red LED emit detection light at a certain inclination angle toward the sensor 50 on the two opposite sides of the sensor 50, so that the utilization rate of the biometric information detection light source 40 can be improved as much as possible.

Optionally, the infrared LED and the red LED respectively include a plurality of LEDs, and the plurality of infrared LEDs and the plurality of red LEDs are arranged around the periphery of the sensor 50 at intervals.

In another implementation manner of the present application, when the biometric information detection apparatus according to the embodiment of the present application is applied to an electronic device for detecting a relatively complex physiological indicator such as blood oxygen content of a wearer, a plurality of biometric information detection light sources 40 may need to be disposed, if a plurality of infrared LEDs and a plurality of red LEDs are included, the plurality of infrared LEDs and the plurality of red LEDs are disposed around the periphery of the sensor 50 at intervals, the plurality of surrounding infrared LEDs and the plurality of surrounding red LEDs all emit detection light toward the sensor 50 at a certain inclination angle, and the sensor 50 receives the detection light provided by the plurality of biometric information detection light sources 40, so as to improve the light intensity of the detection light, and thus also improve the detection efficiency of the sensor 50.

Alternatively, as shown in fig. 11, the edge distance L1 between the infrared LED and/or the red LED and the sensor 50 is between 2-2.5mm, and when the biometric information detection light source 40 includes the infrared LED and the red LED, two adjacent infrared LEDs, two adjacent red LEDs, and/or the edge distance L2 between two adjacent infrared LEDs and red LEDs is between 2-2.5 mm.

As shown in fig. 11, if the infrared LEDs and the red LEDs are respectively provided in plural numbers, the plural infrared LEDs and the plural red LEDs are arranged around the periphery of the sensor 50 at intervals, and if the distance between the biometric information detection light source 40 and the sensor 50 is too far, the miniaturization design of the entire biometric information detection apparatus may be affected, and if the distance between the biometric information detection light source 40 and the sensor 50 is too close, the mutual interference between the detection lights may be caused, and therefore, the edge distance L2 between any two adjacent biometric information detection light sources 40 is set to be 2-2.5 mm. Further, in order to avoid the need for miniaturization of the device, if the distance between the biometric information detection light source 40 and the sensor 50 is too close, the detection light emitted from the biometric information detection light source 40 may be directly incident on the sensor 50 without being irradiated to the display 30, and the sensor 50 may receive an ineffective light signal, so that the edge distance L1 between any one biometric information detection light source 40 and the sensor 50 is set to be 2 to 2.5 mm.

In another aspect of the embodiment of the present application, an electronic device is provided, which includes a display screen 30 and a biometric information detection apparatus of any one of the foregoing apparatuses, and the biometric information detection apparatus is disposed below the display screen 30.

Optionally, the electronic device further includes a controller electrically connected to the sensor 50 of the biometric information detection apparatus, and the controller extracts and calculates the biometric information from the detection light reflected back after being irradiated to the detection object above the display screen 30.

The electronic device is provided with a controller, and the detection light signal received by the sensor 50 in the biometric information detection apparatus of the embodiment of the present application is analyzed, processed, extracted, and calculated by the controller to obtain biometric information. The electronic device may have a plurality of embodiments, and the wearing position and the wearing manner are determined corresponding to the biometric information to be detected, for example, the electronic device may be a smart bracelet worn on a wrist, a smart collar hung on a neck, or other various mobile terminals or electronic devices, and the electronic device does not need to be worn, but only attaches the mobile terminal or the electronic device to the position to be detected for a certain duration to detect when the electronic device needs to be detected.

Alternatively, a biometric information identification area is preset on the display screen 30, and the biometric information detection light source 40 and the sensor 50 of the display screen 30 are located within the projection range of the biometric information identification area.

Biometric technology has been widely applied to various terminal devices or electronic apparatuses. Biometric identification techniques include, but are not limited to, fingerprint identification, palm print identification, vein identification, iris identification, face identification, biometric identification, anti-counterfeiting identification, and the like. Among them, fingerprint recognition generally includes optical fingerprint recognition, capacitive fingerprint recognition, and ultrasonic fingerprint recognition. Along with the rise of comprehensive screen technique, can set up the local area or the total area below the display screen with the fingerprint identification module to form Under-screen (Under-display) optical fingerprint identification.

Fingerprint identification methods generally include the steps of acquisition of a fingerprint image, preprocessing, feature extraction, feature matching and the like. Part or all of the steps can be realized by a traditional Computer Vision (CV) algorithm, and also can be realized by an Artificial Intelligence (AI) -based deep learning algorithm. The fingerprint identification technology can be applied to portable or mobile terminals such as smart phones, tablet computers and game equipment, and other electronic equipment such as smart door locks, automobiles and bank automatic teller machines, and is used for fingerprint unlocking, fingerprint payment, fingerprint attendance, identity authentication and the like.

When the electronic device of the embodiment of the present application is provided with a biometric information recognition function and a dedicated biometric information recognition area is divided on the display screen 30, the biometric information detection light source 40 and the sensor 50 for biometric information detection may be integrally provided within the projection range of the biometric information recognition area, and the biometric information recognition area may be shared with biometric information recognition, such as fingerprint recognition.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (22)

1. The utility model provides a biological characteristic information detection device for set up in the display screen below, its characterized in that, biological characteristic information detection device includes biological characteristic information detection light source, light-directing structure and sensor, light-directing structure is used for setting up biological characteristic information detection light source's light-emitting side with between the display screen, the detection light of biological characteristic information detection light source outgoing is incited through light-incoming surface of light-directing structure, and by light-directing structure leads to going out the plain noodles and exhale extremely the display screen shines extremely reflection back behind the detection object of display screen top detect the light by the sensor is received.

2. The device for detecting biometric information according to claim 1, wherein an angle is formed between a line connecting the center of the light incident surface and the center of the light emitting surface of the light guide structure and a line perpendicular to the display screen.

3. The apparatus according to claim 1, wherein the detection light has an angle between a main light path in the light guide structure and a straight line perpendicular to the display screen, or wherein the main light path in the light guide structure is perpendicular to the display screen.

4. The device for detecting biometric information according to claim 1, wherein the light guide structure is a columnar light guide, and the light incident surface and the light emitting surface of the light guide structure are respectively located on a top surface and a bottom surface of the columnar light guide.

5. The device as claimed in claim 4, wherein the cross-sectional dimension of the light incident surface of the columnar light guide is smaller than or equal to the cross-sectional dimension of the light emergent surface.

6. The apparatus according to claim 4, wherein the cross-sectional shape of the columnar light guide is circular or elliptical, the diameter of the light incident surface of the columnar light guide is equal to the maximum diagonal length of the effective light emitting area of the biometric information detection light source, and the light incident surface of the columnar light guide is attached to the biometric information detection light source.

7. The biometric information detection device according to claim 4, wherein the columnar light guide has a solid structure, and a side wall of the columnar light guide is a total reflection surface.

8. The device for detecting biometric information according to claim 7, wherein an included angle is formed between the light emitting surface of the columnar light guide and a plane where the display screen is located, and the height of the light emitting surface of the columnar light guide is gradually reduced from a side away from the sensor to a side close to the sensor.

9. The apparatus according to claim 7, wherein the light exit surface of the columnar light guide is an inner concave surface.

10. The apparatus according to claim 7, wherein a diffusion film is disposed on a light emitting surface of the columnar light guide.

11. The biometric information detection device according to claim 4, wherein the columnar light guide body is a hollow structure, and a reflective layer is disposed on an inner side wall of the columnar light guide body.

12. The biometric information detection device according to claim 11, wherein a first concave lens is provided on a light exit surface of the columnar light guide.

13. The biometric information detection device according to any one of claims 1 to 12, wherein a light uniformizing module is provided between the display screen and the receiving side of the sensor.

14. The apparatus according to claim 13, wherein the dodging module includes a second concave lens.

15. The biometric information detection device according to claim 14, wherein a diameter of the second concave lens is equal to or larger than a width of a receiving surface of the sensor.

16. The apparatus according to claim 14, wherein the dodging module further comprises a converging lens, and the detecting light reflected back after being irradiated onto the detection object above the display screen passes through the converging lens and the second concave lens in sequence and is received by the sensor.

17. The biometric information detection device according to claim 16, wherein a diameter of the converging lens is equal to or larger than a diameter of the second concave lens.

18. The biometric information detection device according to any one of claims 1 to 12, wherein the biometric information detection light source includes an infrared LED and/or a red LED.

19. The apparatus according to claim 18, wherein the biometric information detection light source includes an infrared LED and a red LED, and the infrared LED and the red LED are respectively disposed at intervals on opposite sides of the sensor.

20. The apparatus according to claim 19, wherein the infrared LED and the red LED are respectively provided in plural numbers, and the plural infrared LEDs and the red LED are arranged at intervals around an outer circumference of the sensor.

21. The apparatus according to claim 18, wherein the distance between the edges of the infrared LED and/or the red LED and the sensor is 2-2.5mm, and when the biometric information detection light source comprises an infrared LED and a red LED, the distance between two adjacent infrared LEDs, two adjacent red LEDs, and/or the distance between the edges of the adjacent infrared LED and red LED is 2-2.5 mm.

22. An electronic device comprising a display screen and the biometric information detection device according to any one of claims 1 to 21, wherein the biometric information monitoring device is disposed below the display screen.

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