Apparatus and method for analyzing living body information

1. An apparatus for analyzing living body information, the apparatus comprising:

a plurality of pulse wave sensors configured to detect a pulse wave signal of a user and disposed on a rear surface of the apparatus;

a processor configured to analyze the living body information of the user based on the detected pulse wave signal; and

a display configured to display the analyzed living body information and disposed on a front surface of the apparatus,

wherein the apparatus is configured to be held with one hand of the user,

the plurality of pulse wave sensors comprises at least a first pulse wave sensor and a second pulse wave sensor, and

the first pulse wave sensor is disposed apart from the second pulse wave sensor in a diagonal direction, on the rear surface of the apparatus, so that the first pulse wave sensor and the second pulse wave sensor are simultaneously touchable by a finger and a palm of the one hand of the user, respectively.

2. The apparatus of claim 1 , wherein:

the first pulse wave sensor is configured to detect a first pulse wave signal from the finger of the user when the user holds the apparatus with the hand; and

the second pulse wave sensor is configured to detect a second pulse wave signal from the palm of the hand when the user holds the apparatus with the hand.

3. The apparatus of claim 1 , wherein the processor comprises:

a selection unit configured to select the first pulse wave sensor and the second pulse wave sensor among the plurality of pulse wave sensors to obtain a first pulse wave signal and a second pulse wave signal respectively from the first pulse wave sensor and the second pulse wave sensor; and

an analyzing unit configured to analyze the living body information based on the first pulse wave signal and the second pulse wave signal.

4. The apparatus of claim 2 , wherein:

a difference between a first distance, which is measured from the first pulse wave sensor to a heart of the user, and a second distance, which is measured from the second pulse wave sensor to the heart, is equal to or greater than 1 cm when the user holds the apparatus with the hand.

5. The apparatus of claim 3 , wherein:

the selection unit is further configured to select the first pulse wave sensor positioned to detect the first pulse wave signal from the finger of the user and the second pulse wave sensor positioned to detect the second pulse wave signal from the palm of the hand when the user holds the apparatus with the hand.

6. The apparatus of claim 3 , wherein the selection unit is further configured to select the first pulse wave sensor and the second pulse wave sensor by comparing signal levels of pulse waves respectively sensed from each of the plurality of pulse wave sensors.

7. The apparatus of claim 3 , wherein the selection unit is further configured to receive a user input that instructs the apparatus to select the first and the second pulse wave sensors, and activate the first pulse wave sensor and the second pulse wave sensor to detect the first pulse wave signal and the second pulse wave signal.

8. The apparatus of claim 3 , wherein the analyzing unit is further configured to extract predetermined characteristic points from the first pulse wave signal and the second pulse wave signal.

9. The apparatus of claim 8 , wherein the first and second pulse wave signals are indicated as a function of a voltage variation with respect to time, and the characteristic points include a peak value of the function.

10. The apparatus of claim 6 , wherein the analyzing unit is further configured to calculate a pulse transit time (PTT) from a time difference between a characteristic point of the first pulse wave signal and a corresponding characteristic point of the second pulse wave signal.

11. The apparatus of claim 10 , wherein the analyzing unit is further configured to analyze vascular compliance, a blood flow rate, blood viscosity, an arteriosclerosis degree, systolic blood pressure, or diastolic blood pressure based on a distance between the selected two pulse wave sensors and the PTT.

12. The apparatus of claim 1 , further comprising a memory configured to store reference values with respect to the living body information of the user.

13. The apparatus of claim 12 , wherein the processor comprises a diagnosis unit configured to compare a result of analyzing the living body information with the reference values, and determine an abnormality of a health state of the user.

14. The apparatus of claim 1 , further comprising a wireless communication unit.

15. The apparatus of claim 1 , wherein the apparatus is a smartphone.

16. A method of analyzing living body information by a mobile device, the mobile device including a display disposed on a front surface of the mobile device, and a first pulse wave sensor and a second pulse wave sensor disposed on a rear surface of the mobile device, the rear surface opposing the front surface, the method comprising:

detecting a first pulse wave signal and a second pulse wave signal respectively from a finger and a palm of a hand of a user, while the finger and the palm are in contact with the first pulse wave sensor and the second pulse wave sensor, respectively, the first pulse wave sensor being disposed apart from the second pulse wave sensor in a diagonal direction, on the rear surface of the mobile device; and

analyzing living body information based on the first pulse wave signal and the second pulse wave signal.

17. The method of claim 16 , wherein a difference between a first distance, which is measured from the first pulse wave sensor to a heart of the user, and a second distance, which is measured from the second pulse wave sensor to the heart, is equal to or greater than 1 cm.

18. The method of claim 16 , wherein:

the first pulse wave signal and the second pulse wave signal are represented as a function of a voltage variation with respect to time, and

the analyzing comprises comparing a peak value of the voltage variation function with a peak value of a differentiation function of the voltage variation function to determine a pulse transit time (PTT), and analyzing the living body information based on the PTT.

19. The method of claim 16 , further comprising comparing a result of the analyzing the living body information with a reference value to determine an abnormality of a health state of the user.

20. A method of analyzing biometric information by a handheld device including a plurality of first pulse wave sensors which are disposed in a first region on a rear of the handheld device and a plurality of second pulse wave sensors which are disposed in a second region on the rear of the handheld device, the method comprising:

identifying first pulse wave sensors and second pulse wave sensors which are in contact with a user, among the plurality of first pulse wave sensors and the plurality of second pulse wave sensors; and

selectively activating at least one of the identified first pulse wave sensors and at least one of the identified second pulse wave sensors in response to a distance between the at least one of the identified first pulse wave sensors in the first region and the at least one of the identified second pulse wave sensors in the second region being greater than a predetermined distance.

21. The method of claim 20 , further comprising:

obtaining a first pulse wave signal and a second pulse wave signal from the activated at least one first pulse wave sensor and the activated at least one second pulse wave sensor, respectively, and

determining a blood pressure level based on the first pulse wave signal and the second pulse wave signal.