Smart ring for measuring biosignal

Abstract

To provide a smart ring for sensing a biosignal.SOLUTION: According to an aspect of the present disclosure, there is provided a smart ring for contacting a skin and sensing a biosignal. The smart ring includes: at least one light emitting circuit including a first light source to a third light source respectively generating light of a first wavelength to a third wavelength incident on an inner side of the skin at a first time point to a third time point without overlapping; a switch respectively controlling the at least one light emitting circuit; a first driving circuit to a third driving circuit respectively controlling the first light source to the third light source of each light emitting circuit; and a sensing circuit for acquiring reflected light output from the at least one light emitting circuit and reflected from the inner side of the skin.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a smart ring, and more particularly to a smart ring for measuring biosignals such as electrocardiograms and blood pressure. [Background technology]

[0002] The wearable healthcare market is expanding due to the combination of information and communication technology and medical services. Wearable products contain various sensors that collect information such as the user's heart rate, exercise volume, and location, and transmit it to a mobile device connected to the wearable product.

[0003] For example, wearable products may also include photoplethysmography (PPG) sensors, which optically detect light reflected or transmitted by tissue and blood to measure changes in blood flow. Based on the information measured by the PPG sensor, heart rate, blood pressure, respiration, and blood oxygen saturation can be predicted.

[0004] A PPG sensor generally consists of two photoluminescence elements (LEDs: light-emitting diodes) and one optical sensor. Specifically, light emitted from the LEDs is incident on the inside of the skin, where it is partially absorbed and scattered within the tissue, and the transmitted and reflected light is detected by the optical sensor. Since the amount of light absorbed within the tissue varies greatly depending on the blood flow rate, the blood flow rate can be measured based on the amount of light measured by the optical sensor.

[0005] Furthermore, since wearable products must be easy to carry and must be worn on the user's body for a long period of time, there are limitations on the product size and the area that comes into contact with the skin, which in turn limits the size and number of sensors that can be installed in the wearable product. Summary of the Invention [Problem to be solved by the invention]

[0006] The problem to be solved by the technical idea of ​​the present disclosure is to provide a smart ring for sensing biological signals, which includes light sources arranged in a matrix. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, according to one aspect of the technical idea of ​​the present disclosure, a smart ring for contacting the skin and sensing biological signals is characterized by including at least one light-emitting circuit including first to third light sources that generate light of first to third wavelengths that is incident on the inside of the skin at first to third non-superimposed time points, respectively; a switch that controls each of the at least one light-emitting circuit; first to third driving circuits that control the first to third light sources of each light-emitting circuit, respectively; and a sensing circuit that acquires reflected light output from the at least one light-emitting circuit and reflected from the inside of the skin.

[0008] As an example, the at least one light-emitting circuit may include a first light-emitting circuit and a second light-emitting circuit provided on an inner surface where the smart ring comes into contact with the skin, and the first light-emitting circuit and the second light-emitting circuit may be arranged adjacent to each other.

[0009] For example, a light source generating light of the first wavelength in the first light-emitting circuit and a light source generating light of the first wavelength in the second light-emitting circuit may be arranged adjacent to each other.

[0010] As an example, the at least one light-emitting circuit may include a first light-emitting circuit and a second light-emitting circuit provided on the inner surface where the smart ring comes into contact with the skin, and the first light-emitting circuit and the second light-emitting circuit may be arranged so that the distance between the first light-emitting circuit and the second light-emitting circuit is the diameter of the smart ring.

[0011] As an example, the at least one light-emitting circuit may include a first light-emitting circuit through an nth light-emitting circuit (n is a natural number greater than or equal to 3) provided on the inner surface where the smart ring comes into contact with the skin, and the first light-emitting circuit through the nth light-emitting circuit may be uniformly arranged on the inner surface.

[0012] As an example, the inner surface of the smart ring that comes into contact with the skin may be formed into a polygonal prism, and each of the light-emitting circuits may be provided on each surface of the polygonal prism, and a first light-emitting circuit group of the at least one light-emitting circuit may operate in a first operating mode, and a second light-emitting circuit group of the at least one light-emitting circuit may operate in a second operating mode.

[0013] As an example, the first light-emitting circuit group includes a first light-emitting circuit and a second light-emitting circuit respectively arranged on adjacent surfaces of the polygonal prism, and the second light-emitting circuit group includes a third light-emitting circuit and a fourth light-emitting circuit respectively arranged on opposing surfaces of the polygonal prism.

[0014] For example, the first to third light sources of the first to fourth light-emitting circuits may be sequentially arranged in a first direction corresponding to a height direction of the smart ring.

[0015] For example, the first to third driving circuits may sequentially drive the first to third light sources of the first light-emitting circuit and the second light-emitting circuit, respectively, in the first operating mode, and sequentially drive the first to third light sources of the third light-emitting circuit and the fourth light-emitting circuit, respectively, in the second operating mode.

[0016] For example, the first wavelength, the second wavelength, the third wavelength, and the third wavelength may include a red region, a green region, and an infrared region, respectively.

[0017] As an example, the first driving circuit to the third driving circuit may control the respective cycles for driving the first light source to the third light source of each light-emitting circuit based on at least one of the biological signal and a control signal generated based on the biological signal.

[0018] For example, the first driving circuit to the third driving circuit may be controlled so that the period for driving the first light source to the third light source of the first light-emitting circuit and the second light-emitting circuit, respectively, is different from the period for driving the first light source to the third light source of the third light-emitting circuit and the fourth light-emitting circuit, respectively.

[0019] As an example, the smart ring may further include a temperature sensor for measuring the temperature of the skin, and the first to third driving circuits may control the respective driving periods of the first to third light sources of the respective light-emitting circuits based on the temperature measured by the temperature sensor. [Effects of the Invention]

[0020] According to the smart ring for measuring biological signals based on the technical idea of ​​the present disclosure, by providing light sources arranged in a matrix, the number of light sources that can be mounted on a smart ring having a limited area can be increased, thereby increasing the light intensity and improving the accuracy of the measured biological signals.

[0021] Furthermore, according to the smart ring for measuring biological signals based on the technical idea of ​​the present disclosure, by selectively operating some of the multiple light-emitting circuits, a single smart ring can be used in a variety of sensing modes. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a block diagram of a smart ring according to an exemplary embodiment of the present disclosure. [Figure 2] 1A and 1B are exemplary diagrams illustrating the shape of a smart ring according to an exemplary embodiment of the present disclosure. [Figure 3] 1 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure. [Figure 4] 1 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure. [Figure 5]1 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure. [Figure 6] 1 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure. [Figure 7] 1 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure. [Figure 8] FIG. 10 is a timing diagram illustrating wavelengths generated by multiple light sources, according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts that are not relevant to the description are omitted in order to clearly explain the present invention, and similar parts are designated by similar reference numerals throughout the specification.

[0024] Throughout the specification, when a part "includes" a certain element, it does not mean excluding other elements, but also means including other elements, unless otherwise specified. Furthermore, terms such as "unit," "device," and "module" used in the specification mean a unit that processes at least one function or operation, and may be realized by hardware, software, or a combination of hardware and software.

[0025] Throughout the specification, when a part is referred to as being "connected" to another part, this does not only mean that it is "directly connected" to another part, but also that it is "electrically connected" to another part via another element therebetween. Furthermore, when a part is referred to as "comprising" a certain component, unless specifically stated to the contrary, this does not mean that it excludes other components, but also that it further includes other components, and it should be understood that it does not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0026] In this specification, a "smart ring" may refer to a wearable device that is worn by being inserted into a user's finger. The smart ring may be placed in contact with the user's finger, emit light to the inside of the finger skin, and measure the user's biosignals using the light reflected from the inside of the skin. The biosignals measured by the smart ring are transmitted to the outside, and cardiovascular activity-related values ​​such as the user's blood pressure, heart rate, and heart rate variability may be measured based on the biosignals.

[0027] The smart ring can communicate with an external electronic device and transmit the measured biosignals to the electronic device. The smart ring can also be controlled through the electronic device. For example, the electronic device can be any type of handheld-based wireless communication device, such as a smartphone, a tablet PC (personal computer), or a laptop. The smart ring and the electronic device can communicate via 3G (generation), 4G, 5G, 3GPP (3rd Generation Partnership Project), LTE (long term evolution), WiMAX (World Interoperability for Microwave Access), Wi-Fi (wireless fidelity), Bluetooth, infrared communication, ultrasonic communication, visible light communication (VLC), Li-Fi, etc.

[0028] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0029] FIG. 1 is a block diagram of a smart ring according to an exemplary embodiment of the present disclosure.

[0030] 1, the smart ring 100 also includes at least one light-emitting circuit 110, a plurality of driving circuits 121, 122, 123, a switch 130, and a sensing circuit 140. Hereinafter, for convenience of explanation, the at least one light-emitting circuit 110, the plurality of driving circuits 121, 122, 123, the switch 130, and the sensing circuit 140 will be referred to as a biosensor.

[0031] The smart ring 100 also includes at least one light-emitting circuit 110. Each light-emitting circuit 110 includes a first light source 111, a second light source 112, and a third light source 113. The first light source 111, the second light source 112, and the third light source 113 each include a photoluminescence element (LED: light-emitting diode) that generates light of a first wavelength, a second wavelength, and a third wavelength, respectively. The first wavelength, the second wavelength, and the third wavelength include, but are not limited to, a red wavelength, a green wavelength, and an infrared wavelength, respectively.

[0032] The light generated by the first light source 111, the second light source 112, and the third light source 113 may be incident on the inside of the skin that is in contact with the smart ring 100. Some of the light is absorbed and / or scattered within the skin tissue, and some of the light is transmitted and / or reflected. At this time, the transmitted and / or reflected light may be sensed by the sensing circuit 140.

[0033] The switches 130 may control each of the light-emitting circuits 110. The switches 130 may include, but are not limited to, MOS transistors. By controlling the light-emitting circuits 110 with the switches 130, the multiple light sources 111, 112, and 113 included in the light-emitting circuits 110 may be controlled.

[0034] The sensing circuit 140 may sense reflected light generated by the first light source 111, the second light source 112, and the third light source 113 and reflected from at least one of blood vessels in the skin and tissue. The sensing circuit 140 may also include at least one diode. The sensing circuit 140 may sense all of the reflected light generated by the first light source 111, the second light source 112, and the third light source 113. That is, the wavelength range of the reflected light sensed by the sensing circuit 140 is not limited. Referring to FIG. 1, at least one light-emitting circuit 110 may share the sensing circuit 140. However, the sensing circuit 140 may also be provided in each light-emitting circuit 110.

[0035] The first driving circuit 121, the second driving circuit 122, and the third driving circuit 123 may respectively control the first light source 111, the second light source 112, and the third light source 113. For example, the first driving circuit 121, the second driving circuit 122, and the third driving circuit 123 may sequentially turn on the first light source 111, the second light source 112, and the third light source 113. The first driving circuit 121, the second driving circuit 122, and the third driving circuit 123 may control the first light source 111, the second light source 112, and the third light source 113 based on a biosignal measured by the smart ring 100, a control signal generated by an external electronic device based on the biosignal, the temperature of the skin contacted with the smart ring 100, etc.

[0036] In addition, the first driving circuit 121, the second driving circuit 122 and the third driving circuit 123 can control the first light source 111, the second light source 112 and the third light source 113 depending on the position of the light emitting circuit that includes the first light source 111, the second light source 112 and the third light source 113.

[0037] Although not shown, the smart ring 100 further includes a control unit that controls the switch 130, the sensing circuit 140, and the first, second, and third driving circuits 121, 122, and 123, and a temperature sensor that measures the temperature of the skin that is in contact with the smart ring 100. The smart ring 100 also includes a communication unit that transmits the measured biosignals and temperature to an electronic device and receives control signals.

[0038] FIG. 2 is an exemplary diagram illustrating the shape of a smart ring according to an exemplary embodiment of the present disclosure.

[0039] Referring to FIG. 2, the smart ring 200 includes a first electrode 210, a second electrode 220, an insulating unit 230, and a top cover 240, and further includes a control unit, a printed circuit board, and a battery therein.

[0040] The first electrode 210 is provided in a ring shape, is made of a conductor, and can be inserted into a user's finger and brought into contact with the finger. The second electrode 220 is embedded on the outside of the first electrode 210, is made of a conductor, and can be brought into contact with the user's body. The surface on which the first electrode 210 is provided is referred to as the inner surface of the smart ring 200.

[0041] The smart ring 200 also includes a plurality of insulating units 230. The insulating units 230 are disposed between the first electrode 210 and the second electrode 220 and can maintain insulation between the first electrode 210 and the second electrode 220. The insulating units 230 also include the biosensors of Fig. 1. The biosensors can measure biosignals such as an electrocardiogram (ECG) and a photoplethysmography (PPG).

[0042] For example, the biosensor may be in a flat plate shape or a protruding shape. A plate shape provides a comfortable fit to the user, while a protruding shape increases the degree of contact with the user's finger, improving the accuracy of biosignal sensing. While the biosensor is shown in FIG. 2 as being flat and plate-shaped, it is not limited thereto and may also be curved, similar to the exterior of smart ring 200.

[0043] The control unit is disposed between the first electrode 210 and the second electrode 220, and can collect a biological signal when the second electrode 220 comes into contact with the user's body excluding the finger.

[0044] The second electrode 220 may be configured in an arc shape, and a top cover 240 may be provided on one side of the second electrode 220. The second electrode 220 may be mounted close to a side of the first electrode 210 or the insulating unit 230, and the top cover 240 may be mounted on the opposite side. A printed circuit board and a battery may be provided inside the second electrode 220. The surface on which the second electrode 220 is provided is referred to as the outer surface of the smart ring 200.

[0045] The printed circuit board is made of a flexible material and can be equipped with the control unit and the components shown in FIG. 1. The printed circuit board can also be equipped with a communication module for communicating with external electronic devices. The battery can provide power to allow current to flow between the first electrode 210 and the second electrode 220 and can also provide power to the printed circuit board including the control unit.

[0046] 3 and 4 are exemplary diagrams showing cross sections of smart rings according to exemplary embodiments of the present disclosure.

[0047] In this specification, the inner surface of the smart ring 300a that comes into contact with a user's finger is referred to as the first surface, and the outer surface is referred to as the second surface. Referring to Fig. 3, a biosensor may be provided on the first surface of the smart ring 300a. For example, the biosensor may include two light-emitting circuits 310, and the light-emitting circuits 310 may be adjacent to each other.

[0048] Referring to FIG. 4, each light emitting circuit 310 also includes a first light source 311, a second light source and a third light source.

[0049] In this case, the first light source 311 of the first light-emitting circuit 310 and the first light source of the second light-emitting circuit may be arranged adjacent to each other. That is, light sources generating light of the same wavelength may be arranged adjacent to each other. In this case, the order in which the first light source to the third light source are arranged in each light-emitting circuit may be determined by the wavelengths of the first light source to the third light source.

[0050] For example, the first light source 311 of the first light-emitting circuit 310 and the first light source of the second light-emitting circuit may be operated together as one group. For example, the first drive circuit that drives the first light source 311 may simultaneously drive the first light source 311 of the first light-emitting circuit 310 and the first light source of the second light-emitting circuit. For example, the first drive circuit may sequentially drive the first light source 311 of the first light-emitting circuit 310 and the first light source of the second light-emitting circuit.

[0051] For example, the first to third light sources may be sequentially arranged in a first direction corresponding to the height direction of the smart ring.

[0052] The biosensor may be arranged similarly to the configuration shown in FIG. 1. That is, multiple light sources may be arranged in a matrix, and drive circuits and switches for controlling each light source may be arranged on the edge of the matrix. This allows the number of light sources mounted on a small-area smart ring to be increased, and the increased light intensity may also improve the accuracy of the measured biosignal. Note that, although the biosensor in FIGS. 3 and 4 includes two light-emitting circuits 310, this is not limiting.

[0053] FIG. 5 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure.

[0054] 5, similar to FIGS. 3 and 4, the biosensor includes two light-emitting circuits 310, which may be spaced apart from each other. For example, the distance between the light-emitting circuits 310 may be the diameter of the smart ring. In this case, the light-emitting circuit 310 adjacent to the sensing circuit may sense light reflected from the user's finger, while the light-emitting circuit 310 distant from the sensing circuit may sense light transmitted through the user's finger. As a result, the smart ring 300b can measure biosignals in various ways, thereby improving the accuracy of the signal.

[0055] In this case, the driver and the switch may drive the light-emitting circuit adjacent to the sensing circuit differently from the light-emitting circuit distant from the sensing circuit, for example, by sequentially driving the first through third light sources of the light-emitting circuit adjacent to the sensing circuit and then sequentially driving the first through third light sources of the light-emitting circuit distant from the sensing circuit, but this is merely an example.

[0056] FIG. 6 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure.

[0057] Referring to FIG. 6, the smart ring 300c also includes a plurality of light-emitting circuits 310. The light-emitting circuits 310 may be uniformly arranged on the first surface. That is, the light-emitting circuits 310 may be spaced apart at equal distances. This allows a uniform amount of pressure to be applied to the finger inserted into the smart ring 300c, improving the user's wearing comfort. Furthermore, because the light-emitting circuits 310 surround the finger, the accuracy of the measured signal may be improved.

[0058] In this case, the light-emitting circuit disposed on the bottom surface of the finger, the light-emitting circuit disposed on the top surface of the finger, and the light-emitting circuit disposed on the bottom surface of the finger may output light of different intensities. For example, the light-emitting circuit contacting the skin close to the blood vessel may output light of weak intensity, while the light-emitting circuit contacting the skin far from the blood vessel may output light of strong intensity. The direction in which the smart ring is worn may be determined by determining the output of the light-emitting circuit. Accordingly, the smart ring 300c may further include an alarm unit, which may generate an alarm if the smart ring 300c is not worn in the set direction.

[0059] FIG. 7 is an exemplary diagram showing a cross section of a smart ring according to an exemplary embodiment of the present disclosure.

[0060] Referring to FIG. 7, the inner surface of the smart ring 300d may have a polygonal prism shape. Accordingly, each face of the polygonal prism may be provided with a light-emitting circuit 311, 312, 321, or 322 of the biosensor. Each light-emitting circuit 311, 312, 321, or 322 includes a first light source, a second light source, or a third light source, which may be arranged as described with reference to FIG. 4. Although FIG. 7 illustrates a light-emitting circuit on all faces of the polygonal prism, it goes without saying that a light-emitting circuit may be provided on at least one face.

[0061] The light-emitting circuits 311, 312, 321, and 322 may be divided into a first group 310 and a second group 320. The light-emitting circuits 311 and 312 belonging to the first group 310 may be driven in a first operation mode, and the light-emitting circuits 321 and 322 belonging to the second group 320 may be driven in a second operation mode. That is, when the smart ring 300d is set to the second operation mode, the switch may turn off the light-emitting circuits 311 and 312 belonging to the first group 310 and turn on the light-emitting circuits 321 and 322 belonging to the second group 320.

[0062] The first and second operating modes may be set by an electronic device communicating with the smart ring 300d. For example, the first operating mode may correspond to a reflective biosensor, and the second operating mode may correspond to a transmissive biosensor.

[0063] For example, the first light-emitting circuit 311 and the second light-emitting circuit 312 may belong to the first group 310, and the third light-emitting circuit 321 and the fourth light-emitting circuit 322 may belong to the second group 320. The first light-emitting circuit 311 and the second light-emitting circuit 312 may be arranged on adjacent surfaces of a polygonal prism, and the third light-emitting circuit 321 and the fourth light-emitting circuit 322 may be arranged on opposing surfaces of the polygonal prism.

[0064] The first driving circuit to the third driving circuit, which respectively control the first light source to the third light source of each light-emitting circuit, can be controlled so that the period for driving the first light source to the third light source of each of the first light-emitting circuit 311 and the second light-emitting circuit 312 is different from the period for driving the first light source to the third light source of each of the third light-emitting circuit 321 and the fourth light-emitting circuit 322.

[0065] That is, the first to third drive circuits can control the cycles at which the light sources are driven depending on the operation mode. For example, in the first operation mode, the first to third light sources can be driven sequentially in a first cycle, and in the second operation mode, the first to third light sources can be driven sequentially in a second cycle. Furthermore, the first to third drive circuits can control the order in which the light sources are driven depending on the operation mode.

[0066] FIG. 8 is a timing diagram illustrating wavelengths produced by multiple light sources according to an exemplary embodiment of the present disclosure.

[0067] 8, the first to third light sources may be driven sequentially and periodically. For example, the first to third light sources may be driven sequentially during a first period T. In this case, the period and the order in which the light sources are driven may vary depending on the positions of the first to third light sources within the smart ring.

[0068] For example, the cycle at which the first light source to the third light source are driven may vary based on at least one of the biological signal measured by the smart ring, the control signal generated based on the biological signal, and the temperature of the user's skin measured by the smart ring.

[0069] As described above, exemplary embodiments have been disclosed by the drawings and the specification. Although specific terms have been used to describe the embodiments in this specification, they are used merely for the purpose of describing the technical idea of ​​the present disclosure and are not used to limit the meaning or the scope of the present disclosure as described in the claims. Therefore, a person skilled in the art will understand that various modifications and equivalent other embodiments are possible from these terms. Therefore, the true technical scope of protection of the present disclosure is defined by the technical idea of ​​the appended claims.

Claims

1. It is a smart ring that is placed in contact with the skin and detects biosignals. At least one light-emitting circuit including first to third light sources that generate light of first to third wavelengths at first to third non-superimposed time points, respectively, that is incident on the inside of the skin; a switch for controlling each of the at least one light-emitting circuits; a first drive circuit to a third drive circuit for controlling the first light source to the third light source of each light-emitting circuit, respectively; A smart ring characterized by including a sensing circuit that acquires reflected light output from the at least one light-emitting circuit and reflected from the inside of the skin.

2. the at least one light-emitting circuit includes a first light-emitting circuit and a second light-emitting circuit provided on an inner surface of the smart ring that contacts the skin; The smart ring according to claim 1 , wherein the first light-emitting circuit and the second light-emitting circuit are arranged adjacent to each other.

3. The smart ring of claim 2, characterized in that the light source generating the light of the first wavelength in the first light-emitting circuit and the light source generating the light of the first wavelength in the second light-emitting circuit are arranged adjacent to each other.

4. the at least one light-emitting circuit includes a first light-emitting circuit and a second light-emitting circuit provided on an inner surface of the smart ring that contacts the skin; The smart ring of claim 1, wherein the first light-emitting circuit and the second light-emitting circuit are arranged so that the distance between the first light-emitting circuit and the second light-emitting circuit is the diameter of the smart ring.

5. the at least one light-emitting circuit includes a first light-emitting circuit through an n-th light-emitting circuit (n is a natural number equal to or greater than 3) provided on an inner surface of the smart ring that contacts the skin; The smart ring according to claim 1 , wherein the first light-emitting circuit through the nth light-emitting circuit are uniformly arranged on the inner surface.

6. The inner surface of the smart ring that comes into contact with the skin is formed into a polygonal pillar, The light emitting circuits are provided on each surface of the polygonal prism, The smart ring of claim 1, wherein a first group of the at least one light-emitting circuit operates in a first operating mode, and a second group of the at least one light-emitting circuit operates in a second operating mode.

7. the first light-emitting circuit group includes a first light-emitting circuit and a second light-emitting circuit respectively disposed on adjacent surfaces of the polygonal prism; The smart ring according to claim 6 , wherein the second light-emitting circuit group includes a third light-emitting circuit and a fourth light-emitting circuit, each of which is disposed on an opposite surface of the polygonal prism.

8. The smart ring of claim 7, wherein the first light source to the third light source of the first light-emitting circuit to the fourth light-emitting circuit are sequentially arranged in a first direction corresponding to the height direction of the smart ring.

9. The first drive circuit to the third drive circuit are In the first operation mode, the first light source of the first light-emitting circuit and the second light-emitting circuit are sequentially driven, and The smart ring of claim 6, wherein in the second operation mode, the first light source of the third light-emitting circuit and the fourth light-emitting circuit are sequentially driven.

10. The smart ring of claim 9 , wherein the first wavelength, the second wavelength, and the third wavelength include a red region, a green region, and an infrared region, respectively.

11. The first drive circuit to the third drive circuit are The smart ring of claim 9, characterized in that the cycles for driving the first light source to the third light source of each of the light-emitting circuits are controlled by at least one of the biological signal and the control signal generated based on the biological signal.

12. The first drive circuit to the third drive circuit are The smart ring of claim 11, wherein the cycles for driving the first light source to the third light source of each of the first light-emitting circuit and the second light-emitting circuit are controlled to be different from the cycles for driving the first light source to the third light source of each of the third light-emitting circuit and the fourth light-emitting circuit.

13. the smart ring further includes a temperature sensor for measuring the temperature of the skin; The smart ring of claim 11, wherein the first driving circuit, the second driving circuit, and the third driving circuit control the driving periods of the first light source, the second light source, and the third light source of each light-emitting circuit based on the temperature measured by the temperature sensor.

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