KR20230065819A - Ppg sensor package - Google Patents

Abstract

A PPG sensor package is disclosed. A PPG sensor package according to an embodiment of the present invention includes a base substrate; A light emitting module coupled to an upper portion of the base substrate; a light receiving module coupled to an upper portion of the base substrate and spaced apart from the outside around the light emitting module; and a light blocking module disposed between the light emitting module and the light receiving module and forming an accommodation space by blocking light between the light emitting module and the light receiving module with the light emitting module as the center.

Description

PPG sensor package {PPG SENSOR PACKAGE}

The present invention relates to a PPG sensor package, and more particularly, to a PPG sensor package capable of effectively detecting a blood flow signal from a PPG signal by reducing a deviation of a received optical signal and amplifying the signal intensity.

With the recent increase in interest in health management, there is an increasing interest and demand for healthcare devices that can check and manage one's own health anytime, anywhere, as well as in hospitals.

Among them, photo-electromyography or photoplethysmography (hereinafter referred to as PPG) is a method of measuring health information such as heart rate by measuring the amount of blood flowing through blood vessels.

Such an optical blood flow meter can easily measure heart rate information. It is a method of measuring the heart rate through a change in the volume of blood vessels that occurs during relaxation and contraction of the heart. The heart rate can be measured by measuring the change amount (blood flow change amount) of red light or infrared light.

However, the optical blood flow measurement as described above has many difficulties in reliable heart rate measurement due to individual physical differences caused by fixed placement of the heart rate sensor (PPG sensor) at a certain point due to motion noise caused by movement and individual physical differences. come.

Further, PPG is a method of extracting information related to heartbeat by using a predetermined number of LEDs and a photodetector, and the PPG signal has a disadvantage in that even a slight motion causes motion noise of a large amplitude.

Such motion noise may be defined as a noise signal caused by body tremors and small movements during heart rate detection, and removal of motion noise is required to measure heart rate with high reliability.

Therefore, conventional optical blood flow measurement has limitations in that it is difficult to detect an accurate signal in a user's motion state, making effective heart rate detection impossible.

In addition, the existing optical blood flow measurement was set without dividing the wavelength band, so there was a disadvantage that the optical characteristics of a specific wavelength band could not be utilized, and the efficiency of transmission and reception of light was low because a dedicated transmission and reception device could not be used. There was a difficulty in applying a healthcare wearable device suitable for the purpose.

Korean Patent Publication No. 10-2009-0067549 (published on June 25, 2009)

The problem to be solved by the present invention is to reduce the deviation of the optical signal according to the wavelength band of light and to amplify the signal intensity, so that the blood flow signal can be effectively detected from the PPG signal, and the signal detection accuracy can be utilized by using a multi-directional optical path. provides an excellent PPG sensor package.

According to one aspect of the invention, the base substrate; a light emitting module coupled to an upper portion of the base substrate; a light-receiving module coupled to an upper portion of the base substrate and spaced apart from the outside around the light-emitting module; and a light-blocking module disposed between the light-emitting module and the light-receiving module and forming an accommodation space by blocking light between the light-emitting module and the light-receiving module with the light-emitting module as the center.

The light emitting module is divided into a plurality of pieces, and includes a first light emitting unit that outputs light in a first wavelength band of 400 nm to 900 nm; a second light emitting unit outputting light having a longer wavelength than that of the first light emitting unit; and a third light emitting unit that outputs light having a longer wavelength than that of the second light emitting unit.

The light-receiving module is in the form of a plurality of equally divided pieces, and includes a first light-receiving unit that receives light output from the first light-emitting unit; a second light receiving unit receiving light output from the second light emitting unit; and a third light receiving unit configured to receive light output from the third light emitting unit, wherein a receiving area of the first light receiving unit may be larger than that of the second light receiving unit and the third light receiving unit.

The first light emitting part may include a plurality of pieces, and each of the second light emitting part and the third light emitting part may include one piece.

The first light receiver may be an organic photodiode (OPD) to which a plurality of pieces are connected.

Each of the first light emitting unit, the second light emitting unit, and the third light emitting unit may be disposed adjacent to each of the first light receiving unit, the second light receiving unit, and the third light receiving unit with the light blocking module interposed therebetween.

The PPG sensor package of the present invention can reduce the deviation of the optical signal according to the wavelength band of light and amplify the signal intensity, thereby enabling effective blood flow signal detection from the PPG signal, and using multi-directional optical paths to improve signal detection accuracy. It has an excellent effect.

1 is a diagram showing the overall configuration of a PPG sensor package according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the central portion of the PPG sensor package shown in FIG. 1;
3 is a view showing a modified embodiment of a light receiving module of a PPG sensor package.
FIG. 4 is an enlarged view of the PPG sensor package shown in FIG. 1 .

In order to fully understand the present invention and the advantages in operation of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

In the description of the embodiments of the present invention, terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the above terms, and one element is used only for the purpose of distinguishing it from other components.

Also, in the embodiments of the present invention, singular expressions should be understood to include plural expressions, unless the context clearly indicates otherwise.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

1 is a diagram showing the overall configuration of a PPG sensor package according to an embodiment of the present invention, FIG. 2 is a view showing a cross section in the central portion of the PPG sensor package shown in FIG. 1, and FIG. 3 is a PPG sensor package It is a view showing a modified embodiment of the light receiving module of , and FIG. 4 is an enlarged view of the PPG sensor package shown in FIG. 1 .

Hereinafter, the entire configuration of the PPG sensor package according to an embodiment of the present invention shown in FIGS. 1 and 2 will be described first, and then a modified embodiment in FIG. 3 and a detailed configuration in FIG. 4 will be described.

First, as shown in FIG. 1 , the PPG sensor package 10 includes a base substrate 100 , a light emitting module 300 , a light receiving module 500 and a light blocking module 700 .

That is, the light emitting module 300 is coupled to the upper portion of the base substrate 100, and the light receiving module 500 is spaced apart from the outside of the light emitting module 300 with the light emitting module 300 as the center.

Here, the base substrate 100 is made in the form of a circuit board on which the light emitting module 300 and the light receiving module 500 are mounted, and forms the lower surface of the PPG sensor package 10 .

Therefore, the base substrate 100 is electrically connected to elements such as the light emitting module 300 and the light receiving module 500 located thereon through conductive pads or wires located on the upper and lower portions thereof, so that the electrical signal It allows input/output operations with the corresponding device to be performed.

The base substrate 100 may be formed of a flexible printed circuit board or a rigid printed circuit board.

Next, the light emitting module 300 emits light and is output to the outside of the PPG sensor package 10 to function to irradiate light to the user's body. It uses the fact that the degree of absorption and reflection of light changes according to the change.

The PPG sensor package 10 is capable of detecting a blood flow signal (heartbeat) by detecting light emitted from the light emitting surface of the light emitting module 300 irradiated to the user's body and reflected, and a wide wavelength range or multiple wavelengths. One or more parts capable of emitting light in a range may be provided.

The light emitting module 300 basically has a function of radiating light in all directions, and the light emitted from the light emitting module 300 is reflected by the user's body (vessel, etc.) for which a blood flow signal is to be detected through the PPG sensor. .

The light emitting module 300 may use various light sources capable of detecting a change in blood vessel thickness by irradiating light, and examples thereof include a light emitting diode (LED), an organic light emitting diode (OLED), and an infrared light emitting diode (Infrared Emitting Diode). And it may be any one or more selected from the group consisting of a laser diode.

If such a light source is used, the light emitting module 300 may emit light in an infrared or green light wavelength band.

On the other hand, when the PPG sensor package 10 is used for proximity sensing, the light emitted and received by the light emitting module 300 and the light receiving module 500 is exemplarily an infrared band of 700 nm to 1100 nm and a visible band of 350 nm to 750 nm. A wavelength band including a light band and a wavelength band of light including an ultraviolet band of 400 nm or less may be used.

When the light emitting module 300 emits infrared rays, the heart rate may be measured by measuring the amount of infrared absorption of red blood cells in blood vessels.

In addition, when the light emitting module 300 emits green light, since red blood cells present in blood vessels tend to absorb green light, the heart rate can be measured by measuring the amount of green light absorbed.

The light emitting module 300 may include at least one or more light emitting units emitting light in the PPG sensor package 10. Although four light emitting units are shown as an example in FIG. 1, when two or more light emitting units are included, light is emitted. The parts may be arranged spaced apart from each other in various forms.

The light emitting module 300 may be composed of unit pieces having a specific unit area, and the unit pieces may be included in a smaller number than the unit pieces of the light receiving module 500 .

If the PPG sensor package 100 is used in this way, the amount of light received through the light receiving module 500 can be greatly increased while minimizing the supplied power, thereby improving the efficiency of the device in use.

Details of the light emitting module 300 will be described later.

On the other hand, the light receiving module 500 is coupled to the upper portion of the base substrate 100 and is disposed spaced apart from the outside around the light emitting module 300, and is a part capable of receiving light of a wide wavelength range or several wavelength ranges. One or more of these may be provided.

Light emitted from the light emitting module 300 is reflected by a sensing target located outside the PPG sensor package 10 and is incident toward the light receiving module 500 .

In this case, if a structure is formed in which the light-receiving module 500 surrounds the light-emitting module 300 and is disposed, the light-receiving efficiency can be remarkably improved because a small portion is lost to the outside.

Here, the light receiving module 500 is arranged spaced apart from the outside with respect to the center point of the light emitting module 300, and exemplarily based on the center point of the light emitting module 300 as in one embodiment of the present invention of FIG. Eight unit pieces of light receivers may be arranged in a symmetrical manner.

If the light receiving module 500 is not at an equal distance from the light emitting module 300 but is biased toward one area of a specific position, a deviation in reception sensitivity of an even light signal occurs, and the light receiving efficiency is low, so that the PPG signal can be accurately and accurately received. It is difficult to measure, so it can be arranged in an evenly divided form.

However, unlike the above case, if the light-receiving module 500 is biased toward one area of a specific location, there is an example of using a specific light-emitting part and light-receiving part for a dedicated purpose of increasing light transmission/reception efficiency for a certain wavelength band.

The light receiving module 500 receives a light signal by detecting light emitted from the light emitting module 300 irradiated onto the user's body and reflected light, and generates a current signal for the received light signal.

That is, the light receiving module 500 functions to receive an optical signal for the amount of blood flow in the user's body and generate a current signal related to health information such as heart rate.

The light-receiving module 500 is capable of receiving an optical signal by detecting light reflected from the user's body, and is commonly used in the relevant technical field. Examples of application include organic photodiode (OPD) and silicon. It may be any one of photodiodes.

Next, the light blocking module 700 is disposed between the light emitting module 300 and the light receiving module 500, and blocks and receives light between the light emitting module 300 and the light receiving module 500 with the light emitting module 300 as the center. It serves to shape space.

The light blocking module 700 has light blocking properties and may be made of a material having a property of blocking light, and the light blocking module 700 can block light between the light emitting module 300 and the light receiving module 500. It may be formed in a ring type between the light emitting module 300 and the light receiving module 500 so as to be.

In this regard, referring to the cross-sectional view of the PPG sensor package 10 of FIG. 2, the light blocking module 700 is formed between the light emitting module 300 and the light receiving module 500, and the light emitting module 300 is the center. It may be formed in a ring type to surround the light emitting module 300.

In addition, the vertical height of the light blocking module 700 from the base substrate 100 is higher than the heights of the light emitting module 300 and the light receiving module 500, and through this, the light blocking module 700 is It is possible to more efficiently block light between the light receiving modules 500 .

According to one embodiment of the present invention, although not shown in the drawing, the light blocking module 700 may be a divided ring type formed between the light emitting module 300 and the light receiving module 500 with the light emitting module 300 as the center. there is.

In one embodiment of the present invention, the divided ring type (or 'split-ring type') means a ring type shape, and means a shape in which a ring is divided into two or more plural pieces.

At this time, 'division' means that it is divided into a plurality of pieces (pieces), and may mean that it is divided in a direction perpendicular to the circumference of the ring.

That is, the split-ring type can be illustratively the least two pieces, so it can be called a two-split-ring type, and in the same way, if it exists in three pieces, it can be called a three-split-ring type. And, if it exists in n pieces, it can be said to be an n split-ring type.

The light blocking module 700 may be formed of a plurality of pieces corresponding to the plurality of divided pieces of the light receiving module 500 . At this time, the meaning of 'corresponding to a plurality of pieces' means that each piece of the light receiving module 500 is formed substantially parallel to each piece of the light blocking module 700 in correspondence with the number of times of division, the location of division, etc. can mean

Meanwhile, the PPG sensor package 10 according to an embodiment of the present invention may further include a cover positioned above the light blocking module 700 and an adhesive layer bonding the cover and the light blocking module 700 to each other.

This cover may be made of glass or colorless and transparent polyimide, and since the light emitting module 300 and the light receiving module 500 located inside the PPG sensor package 10 are protected from external shocks or foreign substances, their lifespan increases. .

If a cover made of polyimide is used compared to a cover made of glass, since the weight is light, the installation of the PPG sensor package 10 is easy, the load transferred to the bulkhead is reduced, and the manufacturing cost is reduced.

As an application example, the adhesive layer may be a general adhesive film, or may be formed of a die attach film (DAF).

In general, DAF is a film that adheres to the bottom of the die, and has the advantage of being very thin and uniformly controllable compared to using polymer-based materials.

Hereinafter, details of the light emitting module 300 and the light receiving module 500 will be described.

First, the light emitting module 300 may be disposed in the form of a plurality of pieces divided by itself, and the light emitting module 300 includes a first light emitting unit 310, a second light emitting unit 330, and a third light emitting unit 350. ).

The first light emitting unit 310 outputs light in a first wavelength band, which is a wavelength range of 400 nm to 900 nm, and the second light emitting unit 330 emits light with a longer wavelength than the wavelength range output by the first light emitting unit 310. and the third light emitting unit 350 outputs light having a longer wavelength than the wavelength band output by the second light emitting unit 330 .

Here, it means that the length of the wavelength transmitted by each of the first light emitting unit 310, the second light emitting unit 330, and the third light emitting unit 350 is relatively long and short.

Since the second light emitting unit 330 has a longer wavelength band than the first light emitting unit 310 and the third light emitting unit 350 has a longer wavelength band than the second light emitting unit 330, illustratively, the second light emitting unit 350 has a longer wavelength range than the second light emitting unit 330. The light emitting unit 330 may output light in a wavelength band of 900 nm to 1450 nm, and the third light emitting unit 350 may output light in a wavelength band of 1450 nm to 2000 nm, and it is apparent that the scope of the present invention is not limited thereto.

Here, the first light emitting part 310 itself may include a plurality of pieces, and each of the second light emitting part 330 and the third light emitting part 350 may include one piece.

If it is composed of a plurality of pieces in this way, since the first light emitting unit 310 subdivides and divides the light of various wavelength bands, the advantage of being able to divide and output the light of 400 nm to 900 nm output by the first light emitting unit 310 in more detail. there is.

Even in this case, each of the second light emitting unit 330 and the third light emitting unit 350 may be implemented as one. If one embodiment of the present invention is configured in this way, since there are the second light emitting unit 330 and the third light emitting unit 350 in addition to the light of 400 nm to 900 nm, dedicated light emitting units can be disposed according to each wavelength band.

That is, if each of the light emitting parts constitutes a light emitting part of a different color, transmission and reception of light of various wavelength bands can be distributed in various ways, so it can be applied to various purposes of healthcare products by utilizing this.

Therefore, although the light emitting module 300 has been described as being composed of three light emitting parts in one embodiment of the present invention, it is obvious that it may be composed of a plurality of light emitting parts or three or more light emitting parts.

In addition, the light receiving module 500 may be disposed in the form of a plurality of equally divided pieces. In this case, the light receiving module 500 includes the first light receiving unit 510, the second light receiving unit 530, and the third light receiving unit 550. include

For reference, the light receiving module 500 is also composed of three light receiving units according to an embodiment of the present invention, but it is obvious that it may be composed of a plurality of light receiving units or three or more light receiving units like the light emitting module 300.

The first light receiving unit 510 receives light output from the first light emitting unit 310, the second light receiving unit 530 receives light output from the second light emitting unit 330, and the third light receiving unit 550 receives light output from the third light emitting unit 350 .

Here, the light-receiving area of the first light-receiving unit 510 is larger than that of the second light-receiving unit 530 and the third light-receiving unit 550 .

For reference, in an embodiment of the present invention, a large light-receiving area means that when components of the light-receiving unit are composed of the same unit piece having a certain area, the first light-receiving unit 510 has a plurality of unit pieces It is composed of , which means that the number of units is larger, so the light-receiving area is large.

If the first light receiving unit 510, the second light receiving unit 530, and the third light receiving unit 550 may have the same number of divided pieces, but in this case, they are not made of unit pieces having the same area, but the difference in area I mean that it is implemented in various forms of pieces.

Meanwhile, the first light receiving unit 510 may be implemented as an organic photodiode (OPD) in which a plurality of pieces are connected.

For reference, an organic light diode (OPD) is based on an organic material, is a device that can replace a photodetector, improves the light sensitivity of electronic devices such as cameras, and investigates whether a display can be made with a uniform color composition. can be used

Since the organic material may have sensitivity only in a special wavelength region (ex; red light, green light, blue light, etc.) depending on the material of the organic material, the spectrum of the PPG sensor package 10 is selected by selecting an appropriate material Sensitivity can be adjusted.

In addition, compared to inorganic materials, it is significantly lighter, can reduce production costs, and has flexible characteristics, so it can be used in various wearable device fields such as smart phones and smart watches.

Therefore, when an organic photodiode (OPD) is used as a light receiving unit, there is an advantage in that it is possible to design the structure of the light receiving unit without limiting the area and shape due to its characteristics, and thus the arrangement of the light emitting module 300 and the light receiving module 500 of the present invention. There is a useful advantage in forming a .

Accordingly, the light receiving module 500 can be formed in a structure surrounding the light emitting module 300, and the amount of light received through the light receiving module 500 can be significantly increased in the same product size, so that the PPG signal is accurate, can be accurately measured.

In addition, since the organic photodiode (OPD) can reduce the deviation of reception sensitivity of an optical signal and utilize a multi-directional optical path instead of a uni-directional path, it has an effect of forming an optimal sensing environment even under a user's motion. .

According to another embodiment of the present invention, the first light receiving unit 510 may be a silicon photodiode.

In the case of using the silicon photodiode as described above, the light receiving unit may be formed in a ring type or split-ring type, so that the light receiving unit may be disposed in a structure surrounding the light emitting unit.

Accordingly, the amount of light received through the light receiver can be remarkably increased, so that the PPG signal can be accurately and precisely measured. In addition, a multi-directional optical path can be used instead of a uni-directional path, and a deviation in reception sensitivity of an optical signal can be reduced, so that an optimal sensing environment can be formed even under a user's motion.

According to one embodiment of the present invention, the light receiving unit may be a split-ring type composed of a plurality of divided pieces, wherein the split-ring type is a ring type shape in which the ring is divided into two or more pieces. means

That is, the light receiving unit may be formed in a ring type centered on the light emitting unit, and may be a ring type in which the ring is divided into several pieces and divided into a plurality of pieces. In this way, when the light receiving unit is formed in a split-ring type, the light receiving unit is formed to surround the periphery of the light emitting unit, significantly improving the light receiving efficiency, and since a multi-directional light path can be utilized, the PPG signal can be accurately and precisely measured.

In addition, when the light receiving unit is formed in a split-ring type, since it is configured in a divided form, it absorbs the impact in two parts, so that durability can be further improved and cracks or cracks caused by physical impact can be prevented.

In this regard, FIG. 3 is a layout diagram showing the arrangement of the light receiving unit in the PPG sensor package 10 according to a modified embodiment of the present invention.

Referring to FIG. 3 (a) , it can be seen that the light-receiving module 500, which is divided into two differently when the areas of the light-emitting part are the same, is formed to surround the light-emitting module 300 in an arc shape for a long time. .

If formed in this way, the light receiving unit 130 formed long in an arc shape can receive light of more wavelength bands, and the light receiving units 530 and 550 formed small can be used to receive wavelength bands in a specific area.

In addition, referring to FIG. 3 (b) , it can be seen that light receiving modules 500 divided in various ways asymmetrically around the light emitting module 300 are formed to surround the light emitting module 300 .

That is, it is formed like a disconnected circumferential ring of the light receiving module 500, but it is obvious that the light receiving unit may be formed in the form of arcs of various lengths.

In this way, when the light receiving module 500 is formed in a split-ring type centering on the light emitting module 300, each light receiving unit constituting the light receiving module 500 can be formed in an appropriate size, making it vulnerable to physical impact. There are advantages to improving the points.

Accordingly, there is no risk of damage such as breakage or cracking of each light receiving unit even with a small physical impact, and it is possible to solve the problem of damage in the process and distribution stages. In addition, when mounted in the user's wearable device, it is possible to reduce the risk of failure, such as easy failure when worn by the user.

That is, when the light receiving module 500 of the present invention is formed in a split-ring type, the improvement of light receiving efficiency and the effect of utilizing multi-directional light paths are excellently maintained, and at the same time, problems such as physical damage can be solved. It has been said that it is effective.

Accordingly, the light receiving unit may be formed and arranged in various ways so as to surround the light emitting unit in a split-ring type. Specifically, although not shown in the drawing, the light receiving unit may be formed of a plurality of pieces equally divided around the light emitting unit, or may be formed of a plurality of pieces unevenly divided.

In this case, 'division' means that the light receiving unit is divided into a plurality of pieces, and may mean that the light receiving unit is divided in a direction perpendicular to the circumference of the ring.

In addition, 'evenly divided' may mean that all of the plurality of pieces have the same size and shape.

Also, 'unequal division' may mean a case in which all of the plurality of pieces have different sizes and shapes as well as a case in which only one of the plurality of pieces has a different size and shape. In addition, the 'division' described above may be made in a direction perpendicular to the circumference of the ring.

On the other hand, the first light emitting unit 310, the second light emitting unit 330, and the third light emitting unit 350 respectively correspond to the first light receiving unit 510, the second light receiving unit 530, and the third light receiving unit 550, respectively. It may be disposed adjacently with the light blocking module 700 interposed therebetween.

Referring to FIG. 4 , a first light emitting unit 310 and a first light receiving unit 510 that transmit and receive light are paired and have a relative distance greater than other pairs of light emitting units and light receiving units in the PPG sensor package according to an embodiment of the present invention. If the closer is located close to each other (if you are in the same distance from each other, not the same distance from the same axis), the receiving efficiency can increase due to the close distance.

That is, for example, the distance D1 between the first light emitting unit 310 and the first light receiving unit 510 is the distance D2 between the second light emitting unit 330 and the second light receiving unit 530 and the second light receiving unit 530. 3 If formed smaller than the distance D3 between the light emitting unit 350 and the third light receiving unit 550, due to the close distance between the first light emitting unit 310 and the first light receiving unit 510, the pair of other light emitting units and light receiving units Light reception efficiency may be increased compared to .

In this way, if various settings can be made between each light emitting unit and the light receiving unit, it can be used in various forms according to the characteristics required for each healthcare device.

Similarly, the second light emitting unit 330 and the second light receiving unit 530 are also located eccentrically close to each other, and the third light emitting unit 350 and the third light receiving unit 550 are also located eccentrically close to each other, and each The light emitting unit and the light receiving unit exclusively transmit and receive light of a specific wavelength band, and the PPG sensor package 10 can be designed or used for various purposes, and the reception efficiency of the specific wavelength band can be increased.

As such, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations should be included within the scope of the claims of the present invention.

10: PPG sensor package
100: base substrate 300: light emitting module
500: light receiving module 700: light blocking module

Claims (6)

base substrate;
a light emitting module coupled to an upper portion of the base substrate;
a light-receiving module coupled to an upper portion of the base substrate and spaced apart from the outside around the light-emitting module; and
A PPG sensor package comprising a light blocking module disposed between the light emitting module and the light receiving module and forming an accommodation space by blocking light between the light emitting module and the light receiving module with the light emitting module as a center. According to claim 1,
The light emitting module,
It is in the form of a plurality of divided pieces,
A first light emitting unit that outputs light in a first wavelength band of 400 nm to 900 nm;
a second light emitting unit outputting light having a longer wavelength than that of the first light emitting unit; and
A PPG sensor package including a third light emitting unit outputting light having a longer wavelength than the wavelength band output by the second light emitting unit. According to claim 2,
The light receiving module,
It is in the form of a plurality of pieces equally divided,
a first light receiving unit configured to receive light output from the first light emitting unit;
a second light receiving unit receiving light output from the second light emitting unit; and
A third light receiving unit configured to receive light output from the third light emitting unit;
A PPG sensor package wherein a light-receiving area of the first light-receiving unit is larger than those of the second and third light-receiving units. According to claim 3,
The first light emitting part includes a plurality of pieces, and the second light emitting part and the third light emitting part each include one piece. According to claim 3,
The first light receiving unit is an organic photodiode (OPD) to which a plurality of pieces are connected, a PPG sensor package. According to claim 3,
The first light emitting unit, the second light emitting unit, and the third light emitting unit are disposed adjacently to the first light receiving unit, the second light receiving unit, and the third light receiving unit, respectively, with the light blocking module interposed therebetween.

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