Biosignal detecting device and biosignal detecting system including the same

The present disclosure herein relates to a biosignal detecting device and a biosignal detecting system including the same. According to an embodiment of the inventive concept, the biosignal detecting device is built in a vehicle seat. The biosignal detecting device includes an antenna block. The antenna block transmits a transmission signal to a person seated on the vehicle seat and receives a return signal corresponding to the transmission signal. The antenna block and one surface contacting the seated person are spaced apart from each other so that a distance therebetween is two times or more greater than a wavelength of the transmission signal. According to an embodiment of the inventive concept, through an optimized arrangement of the biosignal detecting device, the biosignal of the seated person may be exactly and effectively detected.

CROSS-REFERENCE TO RELATED APPLICATIONS

This U.S. non-provisional patent application claims priority under 35 U.S.C. § 119 of Korean Patent Application No. 10-2017-0098258, filed on Aug. 2, 2017, the entire contents of which are hereby incorporated by reference.

BACKGROUND

The present disclosure herein relates to a biosignal detection of a vehicle passenger, and more particularly, to a biosignal detecting device built in a vehicle seat and a biosignal detecting system including the same.

Various electronic devices are provided in a vehicle to secure convenience of a user using the vehicle. In particular, devices for recognizing a health condition of a driver by measuring a biosignal of a vehicle driver or the like are provided in a vehicle. Such devices are mainly provided for inducing a safe driving of the driver and preventing accidents. Accordingly, various researches and developments on a method for effectively detecting a biosignal of a vehicle driver are being performed. Also, various researches and developments on a measure for effectively utilizing the detected biosignal are being performed.

Furthermore, in recent years, various devices for providing a pleasant and comfortable driving environment to passengers including the driver are provided in a vehicle. For example, vehicle seats including a seat fan or a heating wire for providing a temperature suitable to the passengers are provided. Since various devices for convenience are provided in a limited space of recent vehicles, a measure for implementing a unique function without disturbing a function of each of the devices for convenience.

SUMMARY

The present disclosure provides a biosignal detecting device built in a vehicle seat to exactly and effectively detect a biosignal and provide a safe driving environment by using the detected biosignal and a biosignal detecting system including the same.

An embodiment of the inventive concept provides a biosignal detecting device that is built in a vehicle seat. The biosignal detecting device includes an antenna block configured to transmit a transmission signal to a person seated on the vehicle seat and receive a return signal corresponding to the transmission signal. One surface, which contacts the seated person, of the vehicle seat and the antenna block are spaced apart from each other so that a distance therebetween is at least two times or more greater than a wavelength of the transmission signal.

In an embodiment, the biosignal detecting device may further include: an oscillator and a mixer. The oscillator may generate a local signal having the same frequency as that of the transmission signal. The mixer may mix the local signal with a detected signal generated on the basis of the return signal. The biosignal detecting device may generate a biosignal on the basis of a phase difference between the transmission signal and the return signal.

In an embodiment, the antenna block may be disposed adjacent to a wave absorber that is disposed to absorb a transmission signal transmitted to a seat face including a rotating blade. The antenna block may contact a separation member provided between the one surface and the antenna block and is spaced apart from the one surface so that a distance therebetween is two times or more greater than a wavelength of the transmission signal. Also, the antenna block may contact one surface of the vehicle seat having a groove. The groove may have a depth that is two times or more greater than a wavelength of the transmission signal.

In an embodiment of the inventive concept, a biosignal detecting system includes first to fourth antenna blocks and first and second signal transmitting/receiving part. The first and second antennal blocks may be built in the first vehicle seat. The third and fourth antenna blocks may be built in a second vehicle seat disposed at a side of the first vehicle seat. The first antenna block may transmit a first transmission signal toward a person seated on the first vehicle seat and receive a first return signal corresponding to the first transmission signal. The second antenna block may transmit a second transmission signal toward a rear seat disposed behind the first vehicle seat and receive a second return signal corresponding to the second transmission signal. The third antenna block may transmit a third transmission signal toward a person seated on the second vehicle seat and receive a third return signal corresponding to the third transmission signal. The fourth antenna block may transmit a fourth transmission signal toward the rear seat and receive a fourth return signal corresponding to the fourth transmission signal.

The first signal transmitting/receiving unit may generate a first biosignal on the basis of the first transmission signal and the first return signal. The first signal transmitting/receiving unit may generate a second biosignal on the basis of the second transmission signal and the second return signal. The second signal transmitting/receiving unit may generate a third biosignal on the basis of the third transmission signal and the third return signal. The second signal transmitting/receiving unit may generate a fourth biosignal on the basis of the fourth transmission signal and the fourth return signal. The second antenna block may further transmit a fifth transmission signal in a rear direction of the first vehicle seat. The fourth antenna block may further receive a fifth return signal corresponding to the fifth transmission signal. The second signal transmitting/receiving unit may generate a fifth biosignal of a person seated on an intermediate portion of the rear seat on the basis of the fifth transmission signal and the fifth return signal.

The biosignal detecting system may further include a drowsiness determining part, a seat occupancy determining part, and a communication module. The drowsiness determining unit may determine whether the seated person is drowsy on the basis of at least one of the first to fifth biosignals. The seat occupancy determining unit may determine whether the seated person is present on the basis of the first to fifth biosignals. The communication module may generate a biosignal of a passenger on the basis of the first to fifth biosignals and transmit the generated biosignal of the passenger to the outside through a wireless communication.

DETAILED DESCRIPTION

Hereinafter, embodiments of the inventive concept are exactly and precisely described so that the present disclosure may be easily implemented by those with ordinary skill in the technical field of the present invention. Hereinafter, a position relationship between components according to an embodiment of the inventive concept will be described. On the basis of a vehicle seat and a person seated on the vehicle seat, an upper portion, an upper end, or an upper side represents a direction from the ground to the seated person. A lower portion, a lower end, or a lower side represents a direction from the seated person to the ground. A front direction represents a direction from a backrest to the seated person. A rear direction represents a direction from the seated person to the backrest. Left and right sides are divided on the basis of a direction in which the person seated on the vehicle seat is viewed from the front.

FIG. 1is a view illustrating a vehicle seat according to an embodiment of the inventive concept. Referring toFIG. 1, a vehicle seat100includes a head support part110, a backrest part120, a bottom part130, and a biosignal detecting device140. The vehicle seat100may include all of a driver seat, a front passenger seat, and a rear seat in a vehicle. Also, according an embodiment of the inventive concept, an object may include an animal boarding on the vehicle seat100as well as a seated person USER.

The head support part110is disposed on an upper end of the backrest part120to support a head of the seated person USER. The backrest part120may be disposed on a rear upper end of the bottom part130so that the seated person USER is able to lean one's back against the backrest part120. The bottom part130is configured so that the seated person USER is able to seat thereon. Although the head support part110, the backrest part120, and the bottom part130are integrated with each other as an example inFIG. 1, these components may be separated. For example, each of the head support part110, the backrest part120, and the bottom part130may have various shapes.

The biosignal detecting device140may be disposed in the backrest part120. The biosignal detecting device140may be built in the backrest part120. The biosignal detecting device140may measure breath and heartbeat of the seated person USER. A portion of the biosignal detecting device140is disposed in the backrest part120that is adjacent to a chest of the seated person USER to easily measure the breath and heartbeat of the seated person USER. Since the biosignal detecting device140detects a signal at a back portion of the seated person USER, the signal is not disturbed by motion of an arm or a shoulder of the seated person USER.

The biosignal detecting device140includes an antenna block141. The antenna block141is disposed in the backrest part120to exactly detect a biosignal. Although the biosignal detecting device140is built in the backrest part120inFIG. 1, other components except for the antenna block141may not be built in the backrest part120. For example, the other components except for the antenna block141may be disposed in the bottom part130or disposed at the outside. The antenna block141may not contact the seated person USER. The antenna block141is spaced more than a predetermined distance from the seated person USER. Here, the predetermined distance may be a distance that is satisfied with a far-field condition in which a signal emitted from the antenna block141is approximated to a plane wave.

Although the antenna block141may include a transmission antenna TA and a receiving antenna RA, an embodiment of the inventive concept is not limited thereto. For example, the antenna block141may include a single antenna performing functions of the transmission antenna TA and the receiving antenna RA. The transmission antenna TA may transmit a transmission signal to the seated person USER. The transmission signal is reflected by the seated person USER. The receiving antenna RA may receive a return signal reflected by the seated person USER.

The biosignal detecting device140may detect the motion of the seated person USER by using the return signal. For example, the biosignal detecting device140may measure a Doppler frequency by using the transmission signal and the return signal. The biosignal detecting device140may detect precise motion such as heartbeat by using the measured Doppler frequency. That is, the biosignal detecting device140may use the Doppler frequency to generate a biosignal such as heartbeat or breath.

For another example, the biosignal detecting device140may detect the motion of the seated person USER by measuring an arrival time of the return signal. To this end, the biosignal detecting device140may transmit an impulse as the transmission signal. In this case, the biosignal detecting device140may detect relatively large motion such as breath. That is, the biosignal detecting device140may generate the biosignal such as the breath by using a transmitting and receiving time of the signal.

FIG. 2is a block diagram of the biosignal detecting device according to an embodiment of the inventive concept. The biosignal detecting device inFIG. 1is described in detail in a biosignal detecting device140inFIG. 2. Referring toFIG. 2, the biosignal detecting device140may include a first antenna block141_1, a second antenna block141_2, a signal transmitting/receiving unit142, and a switch unit143. Although two antenna blocks are exemplarily illustrated inFIG. 2, an embodiment of the inventive concept is not limited thereto. For example, the various numbers of the antenna blocks may be provided. Also, likeFIG. 1, the biosignal detecting device140may include one antenna block. In this case, the switch unit143may not be provided.

The first antenna block141_1may include a first transmission antenna TA1and a first receiving antenna RA1. The first transmission antenna TA1may transmit a first transmission signal. The first receiving antenna RA1may receive a first return signal that is a reflected first transmission signal. The second antenna block141_2may include a second transmission antenna TA2and a second receiving antenna RA2. The second transmission antenna TA2may transmit a second transmission signal. The second receiving antenna RA2may receive a second return signal that is a reflected second transmission signal. That is, the first and second antenna blocks141_1and141_2may perform the same function as that of the antenna block141inFIG. 1.

The first and second antenna blocks141_1and141_2may provide a transmission signal to the same seated person. When the antenna block is provided in plurality, a more wide range of biosignal of the seated person may be detected. Accordingly, degradation in accuracy of biosignal measurement may be prevented, which is caused by a posture of the seated person. Also, the first and second antenna blocks141_1and141_2may provide a transmission signal to different seated persons. For example, the first antenna block141_1may transmit a first transmission signal to a person seated on a vehicle seat including the biosignal detecting device140, and the second antenna block141_2may transmit a second transmission signal to a person seated on a rear seat. Contents regarding this will be described in detail below with reference toFIG. 10.

The signal transmitting/receiving unit142may provide the first transmission signal to the first antenna block141_1or the second transmission signal to the second antenna block141_2. Also, the signal transmitting/receiving unit142may receive the first return signal from the first antenna block141_1or the second return signal from the second antenna block141_2. The signal transmitting/receiving unit142may detect the motion of the seated person by using the first return signal and generate a first biosignal. The signal transmitting/receiving unit142may detect the motion of the seated person by using the second return signal and generate a second biosignal.

The switch unit143may determine an electric connection relationship between the signal transmitting/receiving unit142and the first antenna block141_1and between the signal transmitting/receiving unit142and the second antenna block141_2. The switch unit143may selectively connect the signal transmitting/receiving unit142to one of the first and second antenna blocks141_1and141_2. When the signal transmitting/receiving unit142is connected to the first antenna block141_1, the switch unit143may deliver the first transmission signal to the first antenna block141_1and the first return signal to the signal transmitting/receiving unit142. When the signal transmitting/receiving unit142is connected to the second antenna block141_2, the switch unit143may deliver the second transmission signal to the second antenna block141_2and the second return signal to the signal transmitting/receiving unit142.

FIG. 3is a block diagram of the biosignal detecting device according to an embodiment of the inventive concept.FIG. 3is a view for explaining a process of generating a biosignal by using a transmission signal and a return signal in detail. Referring toFIG. 3, a biosignal detecting device240includes an antenna block241, a first amplifier Amp1, a second amplifier Amp2, an oscillator242, a mixer243, and an analog-digital converter244. The antenna block241may include a transmission antenna TA and a receiving antenna RA, The first amplifier Amp1, the second amplifier Amp2, the oscillator242, the mixer243, and the analog-digital converter244may be components provided in the signal transmitting/receiving unit142inFIG. 2.

The oscillator242generates a local signal. The local signal may have a specific transmission frequency. The local signal may be a sinusoidal signal. The oscillator242may provide the local signal to the first amplifier Amp1. The first amplifier Amp1may amplify the local signal. The transmission signal that is the amplified local signal may be delivered to the transmission antenna TA. The transmission antenna TA may emit the transmission signal to the outside. The receiving antenna RA may receive a return signal corresponding to the transmission signal. The receiving antenna RA may provide the return signal to the second amplifier Amp2. The second amplifier Amp2may amplify the return signal. The detected signal that is the amplified return signal is provided to the mixer243.

The mixer243receives a detected signal generated on the basis of the return signal. Also, the mixer243receives the local signal from the oscillator242. The mixer243mixes the local signal with the detected signal. On the basis of the Doppler effect, an element of the transmission signal and an element of the return signal may be varied. In detail, a phase difference between the transmission signal and the return signal may be present. A signal in which the local signal and the detected signal are mixed may represent an element variation of the return signal. The mixed signal is provided to the analog-digital converter244.

The analog-digital converter244converts the mixed analog signal into a digital signal. The biosignal detecting device240may further include a signal processing device (not shown) generating a biosignal on the basis of the converted digital signal. The digital signal may include an element corresponding to the motion of the seated person. For example, the digital signal may include a heartbeat element corresponding to motion of a heart or a breath element corresponding to motion of a lung. For example, the signal processing device (not shown) may filter the digital signal to separate the heartbeat element from the breath element and generate the biosignal on the basis of the heartbeat element or the breath element.

FIGS. 4A to 4Dare plan views of a vehicle seat illustrating an arrangement of an antenna block according to an embodiment of the inventive concept.FIGS. 4A to 4Dare views illustrating a contact surface at which the backrest part of the vehicle seat and the seated person contact each other. The antenna blocks may be disposed inside the backrest part. In this case, the antenna blocks may not be exposed on the contact surface. That is, the antenna blocks inFIGS. 4A to 4Dare illustrated by a solid line for convenience of description. Also, in the drawings below, components disposed inside the backrest part are illustrated by a solid line for the same reason.

Referring toFIG. 4A, a vehicle seat300_1includes a head support part310_1, a backrest part320_1, and an antenna block330_1. LikeFIG. 4A, one antenna block330_1may be provided in the vehicle seat300_1. The antenna block330_1may be built in the backrest part320_1. The antenna block330_1may be disposed adjacent to a chest to easily detect motion of a heart or a lung of the seated person.

Referring toFIG. 4B, a vehicle seat300_2may include a head support part310_2, a backrest part320_2, and first to third antenna blocks331_2,332_2, and333_2. Although it is illustrated that the vehicle seat300_2includes three antenna blocks, an embodiment of the inventive concept is not limited to the number of the antenna blocks. The first to third antenna blocks331_2,332_2, and333_2may be built in the backrest part320_2. The first to third antenna blocks331_2,332_2, and333_2may be arranged in a row in a longitudinal direction. The first to third antenna blocks331_2,332_2, and333_2may alternatively provide a transmission signal and alternatively receive a return signal. In comparison withFIG. 4A, since the vehicle seat300_2may detect a wide range of motion, an exact and stable biosignal may be generated.

Referring toFIG. 4C, a vehicle seat300_3may include a head support part310_3, a backrest part320_3, and first to third antenna blocks331_3,332_3, and333_3. Although it is illustrated that the vehicle seat300_3includes three antenna blocks, an embodiment of the inventive concept is not limited to the number of the antenna blocks. The first to third antenna blocks331_3,332_3, and333_3may be built in the backrest part320_3. The first to third antenna blocks331_3,332_3, and333_3may be arranged in a row in a transverse direction. In comparison with the vehicle seat300_1inFIG. 4A, since the vehicle seat300_3may detect a wide range of motion, an exact and stable biosignal may be generated.

Referring toFIG. 4D, a vehicle seat300_4may include a head support part310_4, a backrest part320_4, and first to fifth antenna blocks331_4to335_4. Although it is illustrated that the vehicle seat300_4includes five antenna blocks, an embodiment of the inventive concept is not limited to the number of the antenna blocks. The first to third antenna blocks331_4,332_4, and333_4may be arranged in a row in a longitudinal direction. The fourth antenna block334_4may be disposed at a left side of the first to third antenna blocks331_4,332_4, and333_4, and the fifth antenna block335_5may be disposed at a right side of the first to third antenna blocks331_4,332_4, and333_4. In comparison withFIGS. 4A to 4C, since the vehicle seat300_4may detect a more wide range of motion, an exact and stable biosignal may be generated.

Each of the antenna blocks inFIGS. 4A to 4Dmay include a transmission antenna and a receiving antenna. Also, the transmission antenna and the receiving antenna may be arranged in the transverse direction or the longitudinal direction. The arrangement of the transmission antenna and the receiving antenna may be arranged in various directions unlikeFIGS. 4A to 4D. Also, the antenna blocks inFIGS. 4A to 4Dare exemplarily arranged. For example, the antenna blocks may be arranged in X-shaped directions or in a two-dimensional array having a plurality of rows and columns.

FIGS. 5A to 5Dare front views of a vehicle seat illustrating an arrangement of an antenna block and a seat fan according to an embodiment of the inventive concept.FIGS. 5A to 5Dare views exemplarily illustrating the arrangement of the antenna blocks when the vehicle seat further include a movable component. The biosignal detecting device according to an embodiment of the inventive concept detects the motion of the seated person to generate the biosignal. When a transmission signal is provided to the movable element, a return signal may include an element corresponding to the motion of an inner component as well as an element corresponding to the motion of the heart and the lung

Referring toFIG. 5A, a vehicle seat400_1includes a head support part410_1, a backrest part420_1, an antenna block430_1, a seat fan440_1, and a wave absorber450_1. The antenna block430_1, the seat fan440_1, and the wave absorber450_1may be built in the backrest part420_1. The seat fan440_1may include a rotating blade. The seat fan440_1may further include a motor for rotating the rotating blade. The seat fan440_1may circulate air by using the rotating blade. The vehicle seat400_1may provide a comfortable vehicle environment to the seated person by using the seat fan440_1. The person seated on the vehicle seat400_1for a long time may generate sweat, and the seat fan440_1may lower a body temperature of the seated person or remove moisture caused by the sweat.

The wave absorber450_1is disposed between the antenna block430_1and the seat fan440_1. The antenna block430_1emits a transmission signal to detect the motion of the seated person. However, the rotating blade of the seat fan440_1may rotate. The transmission signal may be reflected by the seat fan440_1and carried to the antenna block430_1. In this case, the antenna block430_1may detect the motion of the rotating blade as well as the motion of the seated person. The wave absorber450_1blocks the transmission signal from being reached to the seat fan440_1. The wave absorber450_1may absorb the transmission signal traveling in a direction toward the seat fan440_1. Accordingly, the return signal provided to the antenna block430_1may not include a noise element generated by the seat fan440_1.

Referring toFIG. 5B, a vehicle seat400_2includes a head support part410_2, a backrest part420_2, an antenna block430_2, a seat fan440_2, and a wave absorber450_2. Like the vehicle seat400_1inFIG. 5A, the antenna block430_2, the wave absorber450_2, and the seat fan440_2may be sequentially arranged in the transverse direction. Alternatively, like the vehicle seat400_2inFIG. 5B, the antenna block430_2, the wave absorber450_2, and the seat fan440_2may be sequentially arranged in the longitudinal direction. However, an embodiment of the inventive concept is not limited to those inFIGS. 5A and 5B. For example, the wave absorber may separate the antenna block from the seat fan.

Referring toFIG. 5C, a vehicle seat400_3may include a head support part410_3, a backrest part420_3, first to third antenna blocks431_3,432_3, and433_3, first and second seat fans441_3and442_3, and first and second wave absorber451_3and452_3. A component arrangement when the vehicle seat400_3includes a plurality of antenna blocks is exemplarily illustrated inFIG. 5Cin comparison withFIGS. 5A and 5B. The first to third antenna blocks431_3,432_3, and433_3may be arranged in a row in the transverse direction.

The first seat fan441_3may be disposed at a left side of the first to third antenna blocks431_3,432_3, and433_3. The second seat fan442_3may be disposed at a right side of the first to third antenna blocks431_3,432_3, and433_3. The first wave absorber451_3is disposed between the first seat fan441_3and the first to third antenna blocks431_3,432_3, and433_3. The first wave absorber451_3prevents the transmission signal generated by the first to third antenna blocks431_3,432_3, and433_3from being reached to the first seat fan441_3. The second wave absorber452_3is disposed between the second seat fan442_3and the first to third antenna blocks431_3,432_3, and433_3. The second wave absorber452_3prevents the transmission signal generated by the first to third antenna blocks431_3,432_3, and433_3from being reached to the second seat fan442_3.

Referring toFIG. 5D, a vehicle seat400_4may include a head support part410_4, a backrest part420_4, first to third antenna blocks431_4,432_4, and433_4, first to fourth seat fans441_4to444_4, and first and second wave absorbers451_4and452_4. The first to third antenna blocks431_4,432_4, and433_4may be arranged in a row in the transverse direction. The first and second seat fans441_4and442_4may be disposed above the first to third antenna blocks431_4,432_4, and433_4. The third and fourth seat fans443_4and444_4may be disposed below the first to third antenna blocks431_4,432_4, and433_4.

The first wave absorber451_4is disposed between the first and second seat fans441_4and442_4and the first to third antenna blocks431_4,432_4, and433_4. The first wave absorber451_3prevents the transmission signal generated by the first to third antenna blocks431_4,432_4, and433_4from being reached to the first and second seat fans441_4and442_4. The second wave absorber452_4is disposed between the third and fourth seat fans443_4and444_4and the first to third antenna blocks431_4,432_4, and433_4. The second wave absorber452_3prevents the transmission signal generated by the first to third antenna blocks431_4,432_4, and433_4from being reached to the third and fourth seat fans443_4and444_4.

Referring to the vehicle seats440_1to440_4inFIGS. 5A to 5D, the seat fan and the antenna block is required to be separated. Also, the vehicle seats440_1to440_4is configured so that the seat fan is not disposed between the seated person and the antenna block to prevent the motion of the seat fan from being reflected to the return signal. UnlikeFIGS. 5A to 5D, the seat fan, the wave absorber, and the antenna block may be variously arranged. Also, the vehicle seat may include a movable component in addition to the seat fan. The wave absorber may be disposed between the movable component and the antenna block.

FIG. 6is a front view of a vehicle seat illustrating an arrangement of an antenna block and a heating wire according to an embodiment of the inventive concept.FIG. 6is a view exemplarily illustrating an arrangement of the antenna block when the vehicle seat500further includes a non-movable component. Referring toFIG. 6, the vehicle seat500includes a head support part510, a backrest part520, an antenna block530, and a heating wire540. The antenna block530and the heating wire540may be built in the backrest part520. One or more antenna blocks530may be provided.

The heating wire540may generate heat to increase a temperature of the vehicle seat. The heating wire540may be provided over the entire backrest part to effectively increase the temperature of an entire contact surface, which contacts the seated person, of the backrest part520. The antenna block530and the heating wire540are spaced apart from each other. Since the heating wire540is non-movable unlike the seat fan, an additional wave absorber is not required. However, the heating wire540is not disposed between the seated person and the antenna block530to improve a transmitting/receiving efficiency of the antenna block530. For example, the heating wire540may detour the antenna block530.

FIGS. 7A and 7Bare front views of a vehicle seat illustrating an arrangement of an antenna block, a seat fan, and a heating wire according to an embodiment of the inventive concept.FIGS. 7A and 7Bare views exemplarily illustrating an arrangement of vehicle seats600_1and600_2in which various components are built in. The antenna block, the seat fan, and the heating wire, which are included in the vehicle seats600_1and600_2inFIGS. 7A and 7B, may be built in the backrest parts620_1and620_2.

Referring toFIG. 7A, the vehicle seat600_1includes a head support part610_1, a backrest part620_1, first and second antenna blocks631_1and632_1, first to fourth seat fans641_1to644_1, first and second wave absorbers651_1and652_1, and a heating wire660_1. The first and second antenna blocks631_1and632_1may be arranged in the transverse direction. The first and second seat fans641_1and642_1may be disposed above the first and second antenna blocks631_1and632_1. The third and fourth seat fans643_1and644_1may be disposed below the first and second antenna blocks631_1and632_1.

The first wave absorber651_1may be disposed between the first and second antenna blocks631_1and632_1and the first and second seat fans641_1and642_1. The first wave absorber651_1prevents the transmission signal generated by the first and second antenna blocks631_1and632_1from being reached to the first and second seat fans641_1and642_1. The second wave absorber652_1may be disposed between the first and second antenna blocks631_1and632_1and the third and fourth seat fans643_1and644_1. When a distance between the first and second antenna blocks631_1and632_1and the third and fourth seat fans643_1and644_1is far enough, the transmission signal transmitting toward the seated person may not travel to the third and fourth seat fans643_1and644_1. In this case, the second wave absorber652_1may not be disposed.

The heating wire660_1may be disposed between the first and second antenna blocks631_1and632_1and the third and fourth seat fans643_1and644_1. The heating wire660_1is spaced apart from the first and second antenna blocks631_1and632_1. The heating wire660_1may perform a function for increasing a temperature of the vehicle seat600_1.

Referring toFIG. 7B, a vehicle seat600_2may include a head support part610_2, a backrest part620_2, first to third antenna blocks631_2,632_2, and633_2, first to eighth seat fans641_2to648_2, and first to fourth wave absorbers651_2to654_4. The first to third antenna blocks631_2,632_2, and633_2may be arranged in a longitudinal direction.

The first and second seat fans641_2and642_2may be disposed above the first to third antenna blocks631_2,632_2, and633_2. The third and fourth seat fans643_2and644_2may be disposed below the first to third antenna blocks631_2,632_2, and633_2. The fifth and sixth seat fans645_2and646_2may be disposed at a left side of the first to third antenna blocks631_2,632_2, and633_2. The seventh and eighth seat fans647_2and648_2may be disposed at a right side of the first to third antenna blocks631_2,632_2, and633_2.

The first wave absorber651_2may be disposed between the first to third antenna blocks631_2,632_2, and633_2and the first and second seat fans641_2and642_2. The second wave absorber652_2may be disposed between the first to third antenna blocks631_2,632_2, and633_2and the third and fourth seat fans643_2and644_2. The third wave absorber653_2may be disposed between the first to third antenna blocks631_2,632_2, and633_2and the fifth and sixth seat fans645_2and646_2. The fourth wave absorber654_2may be disposed between the first to third antenna blocks631_2,632_2, and633_2and the seventh and eighth seat fans647_2and648_2.

The first heating wire661_2may be disposed between the first to third antenna blocks631_2,632_2, and633_2and the fifth and sixth seat fans645_2and646_2. The second heating wire662_2may be disposed between the first to third antenna blocks631_2,632_2, and633_2and the seventh and eighth seat fans647_2and648_2.

FIG. 8is a side view of a vehicle seat according to an embodiment of the inventive concept. Referring toFIG. 8, a vehicle seat700includes a head support part710, a backrest part720, and an antenna block730. The antenna block730may include a transmission antenna TA and a receiving antenna RA, The head support part710and the antenna block730may be the head support part and the antenna block inFIGS. 1 to 7B.

The backrest part720may include a seat cover721and a separation member722. The seat cover721surrounds the antenna block730and the separation member722. The seat cover contacts the seated person USER. The seat cover721provides a surface of the backrest part720so that components built in the backrest part720do not directly contact the seated person USER. An embodiment of the inventive concept is not limited to a material of the seat cover721. However, the seat cover disposed between the antenna block730and the seated person USER may not desirably include a metallic material to improve a signal transmitting/receiving efficiency between the antenna block730and the seated person USER.

The separation member722is disposed between the seat cover721and the antenna block730. The separation member722may have one surface contacting the seat cover721. The other surface, which faces the one surface, of the separation member722may contact the antenna block730. The separation member722may fix the antenna block730. The separation member722may not desirably include a metallic material to improve a signal transmitting/receiving efficiency between the antenna block730and the seated person USER. The separation member722may be made of a material having a dielectric constant of about 1, e.g., Styrofoam, plastic, or rubber.

The separation member722allows one surface, which contacts the seated person USER, of the backrest part720and the antenna block730to be spaced more than a predetermined distance. The separation member722may have a first thickness W1so that a back portion of the seated person USER is disposed in a far-field region. For example, the transmission antenna TA of the antenna block730may provide a transmission signal having a transmission frequency to the seated person USER. The transmission frequency may be in a range from about 1 GHz to several tens GHz to detect a precise motion of a chest of the seated person USER. In this case, the transmission signal may have a wavelength of several mm to several tens cm. The first thickness W1may have a length that is two times or more greater than the wavelength of the transmission signal so that the seated person USER is disposed in the far-field region. For example, when the transmission frequency is about 10 GHz, the first thickness W1may be equal to or greater than about 6 cm. Alternatively, a sum of the first thickness W1and the thickness of the seat cover721may be equal to or greater than about 6 cm.

FIG. 9is a side view of a vehicle seat according to an embodiment of the inventive concept. Referring toFIG. 9, a vehicle seat800includes a head support part810, a backrest part820, and an antenna block830. The antenna block830may include a transmission antenna TA and a receiving antenna RA, The head support part810and the antenna block830may be the head support part and the antenna block inFIGS. 1 to 8.

The backrest part820may include a seat cover821. The seat cover821surrounds the antenna block830. LikeFIG. 8, the seat cover821provides a surface of the backrest part820. The seat cover821may have a recessed portion822contacting the antenna block830. Although not shown, a protection film for protecting a surface of the antenna block830may be provided between the antenna block830and the recessed portion822. Also, the recessed portion822may not desirably include a metallic material to improve a signal transmitting/receiving efficiency between the antenna block830and the seated person USER.

The recessed portion822may allow a portion of the vehicle seat800to be recessed in a rear direction of the seated person USER. The recessed portion822may provide a groove having a second thickness W2between the seated person USER and the backrest part820. Like the first thickness W1inFIG. 8, the second thickness W2may have a length two times or more greater than a wavelength of the transmission signal provided from the antenna block830. Alternatively, a sum of the second thickness W2and the thickness of the recessed portion822may have a length that is two times or more greater than the wavelength of the transmission signal. The recessed portion822allows the seated person USER to be spaced apart form the antenna block830so that the seated person USER is disposed in the far-field region. Accordingly, the transmission signal arrived to the seated person USER may be approximated to a plane wave.

FIG. 10is a plan view of a biosignal detecting device according to an embodiment of the inventive concept. Referring toFIG. 10, a biosignal detecting device900includes a first vehicle seat900_1, a second vehicle seat900_2, and a rear seat900_3. The first vehicle seat900_1and the second vehicle seat900_2may include one of the above-described vehicle seats according to an embodiment of the inventive concept. The second vehicle seat900_2may be disposed at a side of the first vehicle seat900_1. One of the first and second vehicle seats900_1and900_2may be a driver seat, and the other thereof may be a front passenger seat. The rear seat900_3may be disposed behind the first and second vehicle seats900_1and900_2. Hereinafter, the first vehicle seat900_1will be described as a driver seat, and the second vehicle seat900_2will be described as a front passenger seat.

The first vehicle seat900_1includes a first biosignal detecting device910_1. The first biosignal detecting device910_1includes a first antenna block911_1and a second antenna block912_1. The first antenna block911_1may include a first transmission antenna TA1and a first receiving antenna RA1. The second antenna block912_2may include a second transmission antenna TA2and a second receiving antenna RA2. Also, the first and second antenna blocks911_1and912_1may be integrated into one antenna having a function of transmitting and receiving a signal. The first biosignal detecting device910_1may include a first transmitting/receiving unit connected to the first and second antenna blocks911_1and912_1and processing a transmission signal or a receiving signal to generate a biosignal.

The first antenna block911_1transmits the transmission signal in a front direction of the first vehicle seat900_1and receives a return signal. That is, the first antenna block911_1transmits the transmission signal to the driver and receives the return signal. On the basis of the return signal received by the first antenna block11_1, the first biosignal detecting device910_1generates a biosignal of the driver. The second antenna block912_1transmits the transmission signal in a rear direction of the first vehicle seat900_1and receives the return signal. The second antenna block912_1may transmit the transmission signal to the person seated on the rear seat. On the basis of the return signal received by the second antenna block912_1from the person seated on the rear seat, the first biosignal detecting device912_1generates a biosignal of the person seated on the rear seat.

The second vehicle seat900_2includes a second biosignal detecting device910_2. The second biosignal detecting device910_2includes a third antenna block911_2and a fourth antenna block912_2. The third antenna block911_2may include a third transmission antenna TA3and a third receiving antenna RA3. The fourth antenna block912_2may include a fourth transmission antenna TA4and a fourth receiving antenna RA4. Alternatively, the third and fourth antenna blocks911_2and912_2may be integrated into one antenna having a function of transmitting and receiving a signal. The second biosignal detecting device910_2may include a first transmitting/receiving unit connected to the third and fourth antenna blocks911_2and912_2and processing a transmission signal or a receiving signal to generate a biosignal.

The third antenna block911_2transmits the transmission signal in a front direction of the second vehicle seat900_2and receives a return signal. That is, the third antenna block911_2transmits the transmission signal to the person seated on the front passenger seat and receives the return signal. On the basis of the return signal received by the third antenna block911_2, the second biosignal detecting device910_2generates the biosignal of the person seated on the front passenger seat. The fourth antenna block912_2transmits the transmission signal in a rear direction of the second vehicle seat900_2and receives the return signal. The fourth antenna block912_2may transmit the transmission signal to the person seated on the rear seat. On the basis of the return signal received by the fourth antenna block912_2from the person seated on the rear seat, the second biosignal detecting device910_2generates the biosignal of the person seated on the rear seat.

The rear seat900_3may have a large area greater than that of the first vehicle seat900_1or the second vehicle seat900_2so that a plurality of persons are seated. For example, first to third seated persons USER1to USER3may be seated on the rear seat900_3. The first seated person USER1may be seated behind the first vehicle seat900_1. The second seated person USER2may be seated behind the second vehicle seat900_2. The third seated person USER3may be seated between the first and second seated persons USER1and USER2.

The first biosignal detecting device910_1may generate a biosignal of the first seated person USER1. For example, the second transmission antenna TA2may transmit a first transmission signal TS1to the first seated person USER1, and the second receiving antenna RA2may receive a first return signal RS1reflected by the first seated person USER1. The first biosignal detecting device910_1may detect the motion of the first seated person USER1on the basis of the first return signal RS1.

The second biosignal detecting device910_2may generate a biosignal of the second seated person USER2. For example, the fourth transmission antenna TA4may transmit a second transmission signal TS2to the second seated person USER2, and the fourth receiving antenna RA4may receive a second return signal RS2reflected by the second seated person USER2. The second biosignal detecting device910_2may detect the motion of the second seated person USER2on the basis of the second return signal RS2.

A biosignal of the third seated person USER3may be generated by using the first and second biosignal detecting devices910_1and910_2. For example, the second transmission antenna TA2may transmit a third transmission signal TS3to the third seated person USER3. The fourth receiving antenna RA4may receive a third return signal RS3reflected by the third seated person USER3. The second biosignal detecting device910_2may detect the motion of the third seated person USER3on the basis of the third return signal RS3. Alternatively, the fourth transmission antenna TA4may transmit the third transmission signal TS3to the third seated person USER3, and the second receiving antenna RA2may receive the third return signal RS3. In this case, the first biosignal detecting device910_1may detect the motion of the third seated person USER3.

The vehicle seat transmitting the third transmission signal TS3and the vehicle seat receiving the third return signal RS3may be different to effectively detect the motion of the third seated person USER3seated on an intermediate portion of the rear seat900_3. The biosignal may be generated by mixing a detected signal generated on the basis of a local signal for generating the transmission signal and the return signal. For mixing the signals, the second biosignal detecting device910_2may generate the same local signal as that generated by the first biosignal detecting device910_1. The second biosignal detecting device910_2may mix the generated detected signal and the local signal on the basis of the third return signal RS3.

Although the first and second vehicle seats900_1and900_2respectively include the biosignal detecting devices different from each other, an embodiment of the inventive concept is not limited thereto. For example, the first vehicle seat900_1includes the first and second antenna blocks911_1and912_1. The second vehicle seat900_2includes the third and fourth antenna blocks911_2and912_2. Here, other components except for the antenna blocks, e.g., the signal transmitting/receiving unit142and the switch unit143inFIG. 2, may be shared in common. That is, the transmission signal for detecting the motion of various seated persons may be generated on the basis of the same oscillator. Alternatively, the biosignals of various seated persons may be generated by mixing the local signal generated by the same oscillator with the detected signal of the seated persons.

The rear seat900_3may not include the biosignal detecting device or the antenna block for detecting the motion of the first to third seated persons USER1to USER3. That is, since the biosignals of the first to third seated persons USER1to USER3are generated by using the first biosignal detecting device910_1provided in the first vehicle seat900_1and the second biosignal detecting device910_2provided in the second vehicle seat900_2, an additional electronic device is not required to be disposed in the rear seat900_3. Also, the biosignal of the third seated person USER3seated on the intermediate portion of the rear seat900_3may be easily generated without an additional biosignal detecting device. Thus, the biosignal detecting system900improves in efficiency and convenience of design.

FIG. 11is a timing chart for explaining biosignal detection of the first to third seated persons inFIG. 10. Referring toFIG. 11, a horizontal axis represents a flow of time. The biosignal detecting system900inFIG. 10may detect the motion of the first to third seated persons USER1to USER3by using a time division method. A vertical axis represents activation or deactivation of each of the second transmission antenna TA2, the second receiving antenna RA2, the fourth transmission antenna TA3, and the fourth receiving antenna RA4. That is, the vertical axis represents that the antenna block transmits the transmission signal ore receives the return signal.

During a first period T1, the biosignal detecting system9000inFIG. 10may detect the motion of the first seated person USER1. During the first period T1, the second transmission antenna TA2transmits the first transmission signal TS1to the first seated person USER1. The second receiving antenna RA2receives the first return signal RS1in response to the first transmission signal TS1. As much as a time in which the first transmission signal TS1is reflected to be returned to the first seated person USER1, a receiving time of the first return signal RS1is delayed.

During a second period T2, the biosignal detecting system9000inFIG. 10may detect the motion of the second seated person USER2. During the second period T2, the fourth transmission antenna TA4transmits the second transmission signal TS2to the second seated person USER2. The fourth receiving antenna RA4receives the second return signal RS2in response to the second transmission signal TS2. As much as a time in which the second transmission signal TS2is reflected to be returned to the second seated person USER2, a receiving time of the second return signal RS2is delayed.

During a third period T3, the biosignal detecting system9000inFIG. 10may detect the motion of the third seated person USER3. During the third period, the second transmission antenna TA2transmits the third transmission signal TS3to the third seated person USER3. The fourth receiving antenna RA4receives the third return signal RS3in response to the third transmission signal TS3. As much as a time in which the third transmission signal TS3is reflected to be returned to the third seated person USER3, a receiving time of the third return signal RS3is delayed.

FIG. 12is a plan view of a biosignal detecting system according to an embodiment of the inventive concept. Referring toFIG. 12, a biosignal detecting system1000includes a first vehicle seat1100, a second vehicle seat1200, a first rear seat1300, and a second rear seat1400. The first vehicle seat1100may have the same constitution as that of the first vehicle seat900_1inFIG. 10. The second vehicle seat1200may have the same constitution as that of the second vehicle seat900_2inFIG. 10. The first rear seat1300may be disposed behind the first and second vehicle seats1100and1200. The second rear seat1400may be disposed behind the first rear seat1300. The biosignal detecting system1000inFIG. 12may be applied to a high-occupancy vehicle such as a van.

The first vehicle seat1100includes a first biosignal detecting device1110. The first biosignal detecting device1110includes a first antenna block1111and a second antenna block1112. The first antenna block1111transmits a transmission signal in a front direction of the first vehicle seat1100and receives a return signal. That is, a biosignal of a person seated in a first detection region DA1is generated by using the first antenna block1111. The second antenna block1112transmits a transmission signal in a rear direction of the first vehicle seat1100and receives a return signal. That is, a biosignal of a person seated in a third detection region DA3is generated by using the second antenna block1112.

The second vehicle seat1200includes a second biosignal detecting device1210. The second biosignal detecting device1210includes a third antenna block1211and a fourth antenna block1212. The third antenna block1211transmits a transmission signal in a front direction of the second vehicle seat1200and receives a return signal. That is, a biosignal of a person seated in a second detection region DA2is generated by using the third antenna block1211. The fourth antenna block1212transmits a transmission signal in a rear direction of the second vehicle seat1200and receives a return signal. That is, a biosignal of a person seated in a fourth detection region DA4is generated by using the fourth antenna block1212.

A plurality of persons may be seated on the first rear seat1300. A biosignal of a person seated behind the first vehicle seat1100, i.e., in a third detection region DA3, may be generated by using the first biosignal detecting device1110. A biosignal of a person seated behind the second vehicle seat1200, i.e., in a fourth detection region DA4, may be generated by using the second biosignal detecting device121. A biosignal of a person seated on an intermediate portion of the first rear seat1300, i.e., in a region in which the third detection region DA3and the fourth detection region DA4overlap each other, may be generated by using the first and second biosignal detecting devices1110and1210. For example, as the second antenna block1112transmits a transmission signal, and the fourth antenna block1212receives a return signal, the biosignal may be generated.

The first rear seat1300includes a third biosignal detecting device1310and a fourth biosignal detecting device1320. The third biosignal detecting device1310includes a fifth antenna block1311. The fourth biosignal detecting device1320includes a sixth antenna block1321. The fifth and sixth antenna blocks1311and1321may transmit a transmission signal in a rear direction of the first rear seat1300and receive a return signal. That is, a biosignal of a person seated in a fifth detection region DA5is generated by using the fifth antenna block1311. Also, a biosignal of a person seated in a sixth detection region DA6is generated by using the sixth antenna block1321.

A plurality of persons may be seated on the second rear seat1400. A biosignal of a person seated in a region of the fifth detection region DA5, which does not overlap the sixth detection region DA6, may be generated by using the third biosignal detecting device1310. A biosignal of a person seated in a region of the sixth detection region DA6, which does not overlap the fifth detection region DA5, may be generated by using the fourth biosignal detecting device1320. A biosignal of a person seated in a region in which the fifth detection region DA5and the sixth detection region DA6overlap each other may be generated by using the third and fourth biosignal detecting devices1310and1320. For example, as the fifth antenna block1311transmits a transmission signal, and the sixth antenna block1321receives a return signal, the biosignal may be generated.

The second rear seat1400may not include an additional biosignal detecting device. That is, since biosignals of persons seated on the second rear seat1400are generated by using the first rear seat1300, an additional electronic device is not required to be disposed in the second rear seat1400. Thus, the biosignal detecting system1000improves in efficiency and convenience of design. UnlikeFIG. 12, the third biosignal detecting device1310and the fourth biosignal detecting device1320may be included in the second rear seat1400. In this case, the third and fourth biosignal detecting devices1310and1320may transmit a transmission signal in a front direction of the second rear seat1400. Also, the first rear seat1300may not include an additional biosignal detecting device.

Each of the third to sixth detection regions DA3to DA6may be greater in area than each of the first and second detection region DA1and DA2. The reason is that a distance between the person seated on the first rear seat1300and the second antenna block1112(or fourth antenna block1212) is greater than a distance between the person seated on the first vehicle seat1100(or second vehicle seat1200) and the first antenna block1111(or third antenna block1211). Accordingly, energy of the transmission signal provided from the second antenna block1112or the fourth antenna block1212may be less than that of the transmission signal provided from the first antenna block1111or the third antenna block1211.

FIG. 13is a view of a biosignal detecting system according to an embodiment of the inventive concept. Referring toFIG. 13, a biosignal detecting system2000includes a vehicle seat2100, a processor2200, and an output device2300. The vehicle seat2100includes a head support part2110, a backrest part2120, a bottom part2130, and a biosignal detecting device2140. The biosignal detecting device2140includes an antenna block2141. The vehicle seat2100may include one of the vehicle seats described inFIGS. 1 to 9.

The processor2200may perform a function of a central control device of the biosignal detecting system2000. The processor2200may perform a control operation and a calculation operation, which are required to realize the biosignal detecting system2000. For example, the biosignal detecting device2140included in the vehicle seat2100may transmit a transmission signal to the seated person USER and receive a return signal according to the control of the processor. The biosignal detecting device2140may generate a biosignal according to the control of the processor2200. The processor2200may include a drowsiness determining unit2210and a seat occupancy determining unit2200.

The drowsiness determining unit2210may receive a biosignal from the biosignal detecting device2140according to the control of the processor2200. The drowsiness determining unit2210may determine whether the seated person USER is drowsy on the basis of the biosignal. The biosignal may include information on breath or heartbeat of the seated person USER on the basis of motion of the seated person USER. The drowsiness determining unit2210may determine a heartbeat rate, a heartbeat variation rate, a breath rate, or a breath size of the seated person USER on the basis of the biosignal. The drowsiness determining unit2210may predict a sleeping state or a drowsing state of the seated person USER by analyzing the heartbeat rate, the heartbeat variation rate, the breath rate, the breath size, or the like. The drowsiness determining unit2210may be realized by using an individual circuit such as application specific integrated circuit (ASIC). Alternatively, the drowsiness determining unit2210may be realized by a software or a firmware to determine whether the seated person USER is drowsy.

When the drowsiness determining unit2210determines that the seated person is in a drowsiness state on the basis of an analysis result of the biosignal, a drowsiness signal may be generated. The drowsiness warning signal may be provided to the output device2300. When the drowsiness signal is received, the output device2300may display a drowsiness warning screen, generate a drowsiness prevention alarm, or generate a vibration. The drowsiness determining unit2210may receive the biosignal from the biosignal detecting device included in the driver seat to determine whether the driver is drowsy. That is, the drowsiness determining unit2210may determine whether the driver drives while drowsy. Also, the drowsiness determining unit2210may receive the biosignal from the front passenger seat or the rear seat to determine the drowsiness state. For example, when the biosignal detecting system2000is an autonomous driving system and is reached to a destination, the drowsiness determining unit2210may generate the drowsiness signal.

The seat occupancy determining unit2220may receive the biosignal from the biosignal detecting device2140according to the control of the processor2200. The seat occupancy determining unit2220may determine whether the seated person USER occupies the seat on the basis of the biosignal. The biosignal detecting device2140generates the biosignal on the basis of the motion of the seated person USER. When the seated person USER is not seated on the vehicle seat2100, the biosignal detecting device2140may not detect the motion. Accordingly, the seat occupancy determining unit2220may predict whether the seat is occupied by the seated person USER by analyzing the biosignal. The seat occupancy determining unit2220may be realized by using an individual circuit such as application specific integrated circuit (ASIC). Alternatively, the seat occupancy determining unit2220may be realized by a software or a firmware to determine whether the seat is occupied by the seated person USER.

The seat occupancy determining unit2220may analyze the biosignal to generate a seat occupancy signal. The seat occupancy signal may be provided to the output device2300. When the seat occupancy signal is received, the output device2300may display an occupancy indication or the like. Alternatively, the output device2300may generate a seat occupancy guidance alarm or display a seat occupancy guidance screen. The seat occupancy determining unit2220may receive the biosignal from the driver seat, the front passenger seat, and the rear seat to determine whether the seat is occupied. When the processor2200recognizes that the seated person USER is seated on the vehicle seat2100, the processor2200may determine whether a safety belt is fastened and provide information on safety belt fastening to the output device.

The seat occupancy determining unit2220may analyze the biosignal to determine the kinds of an object occupying the vehicle seat2100. For example, when the object occupying the vehicle seat2100is an inanimate object, the biosignal detecting device2140may not detect motion of the object. In this case, the seat occupancy determining unit2220may determine that the object is an inanimate object, so that the seat occupancy signal is not generated. Also, when the object occupying the vehicle seat2100is an animal such as a dog, the biosignal generated by the biosignal detecting device2140may be different from the biosignal generated by a human. That is, since heartbeat and breath of an animal is different from those of a human, the seat occupancy determining unit2220may determine that the object occupying the vehicle seat2100is not a human.

The processor2200may receive the biosignal to generate a signal related to the various seated person USER in addition to the drowsiness or the seat occupancy. For example, the processor2200may analyze the biosignal to determine whether a sudden disease occurs. The processor2200may determine a health condition of the seated person USER when a vehicle accident occurs. The processor2200may control vehicle driving in addition to the biosignal processing and various devices, e.g., the seat fan or the heating wire, included in the biosignal detecting system2000.

The output device2300may receive various signals from the processor2300. The output device2300may output various information that is recognizable by the seated person USER according to the control of the processor2200. The output device2300may receive the drowsiness warning signal generated by the drowsiness determining unit2210. The output device2300may receive the seat occupancy signal generated by the seat occupancy determining unit2220. The output device2300may include a display2310, a speaker2320, and a vibration generating device2330.

The display2310may display an image on the basis of the signal received from the processor2200. For example, the display2310may display the drowsiness warning screen on the basis of the drowsiness warning signal. The display2310may display the seat occupancy guidance screen on the basis of the seat occupancy signal. The speaker2320may generate a sound on the basis of the signal received from the processor2200. For example, the speaker2320may generate the drowsiness prevention alarm on the basis of the drowsiness warning signal. The speaker2320may display the seat occupancy guidance alarm on the basis of the seat occupancy signal. The vibration generating device2330may generate a vibration on the basis of the signal received from the processor2200. For example, the vibration generating device2330may generate a vibration on the basis of the drowsiness warning signal.

The biosignal detecting system2000may further include a memory for storing information and codes, which are processed or will be processed by the processor2200. The memory may store the biosignal generated by the biosignal detecting device or the like. Also, the biosignal detecting system2000may further include a storage for storing information generated by an operating system or applications, a file for driving the operating system, or an execution file of the applications, which are intended to be stored for a long-term. Besides, the biosignal detecting system2000may further include various components for performing functions of the biosignal detecting system2000.

FIG. 14is a view of a health care system according to an embodiment of the inventive concept. Referring toFIG. 14, a health care system3000may include a biosignal detecting system3100, a network3600, a health care center3700, and a hospital3800. The biosignal detecting system3100may include a first vehicle seat3200, a second vehicle seat3300, a rear seat3400, and a communication module3500.

The first vehicle seat3200may include a first biosignal detecting device3210. The first biosignal detecting device3210may include a first antenna block3211and a second antenna block3212. The second vehicle seat3300includes a second biosignal detecting device3310. The second biosignal detecting device3310may include a third antenna block3311and a fourth antenna block3312. The first vehicle seat3200may have the same constitution as that of the first vehicle seat900_1inFIG. 10. The second vehicle seat3300may have the same constitution as that of the second vehicle seat900_2inFIG. 10. The rear seat3400may have the same constitution as that of the rear seat900_3inFIG. 10.

The communication module3500may receive the biosignals of a driver, a person seated on a front passenger seat, and a person seated on a rear seat from the first and second biosignal detecting devices3210and3310. The communication module3500may generate the biosignal of the passenger on the basis of the biosignal. The communication module3500may encode the biosignal to generate the biosignal of the passenger. The communication module3500may transmit the biosignal of the passenger through a wire or a wireless communication.

The network3600may receive the biosignal of the passenger from the communication module3500and provide the received biosignal to the health care center3700or the hospital3800. The health care center3700or the hospital3800may provide a health care service on the basis of the biosignal of the passenger. For example, the health care center3700may monitor a health state of the passengers using the biosignal detecting system3100on the basis of the biosignal of the passenger. The health care center3700may provide a health care signal to the biosignal detecting system3100through the network3600. The hospital3800may recognize whether the seated persons using the biosignal detecting system3100have diseases on the basis of the biosignal of the passenger. The hospital3800may provide a health warning signal through the network3600. Besides, the biosignal of the passenger may be provided to various service providing facilities through the network3600.

The biosignal detecting device and the biosignal detecting system including the same according to the embodiment of the inventive concept may be built in the vehicle seat to detect the motion of the seated person, thereby exactly and effectively detecting the biosignal. Also, the biosignal detecting device and the biosignal detecting system including the same according to the embodiment of the inventive concept may effectively detect the biosignals of the seated persons boarding on the vehicle in virtue of arranging the optimized biosignal detecting device and provide various services by using the detected biosignals.

The above-described contents are exemplary embodiments for implementing the present disclosure. Although the exemplary embodiments of the present invention have been described, it is understood that the present disclosure should not be limited to these exemplary embodiments but various changes and modifications can be made by one ordinary skilled in the art within the spirit and scope of the present invention as hereinafter claimed.