US 12,343,170 B2
Bio-information measuring apparatus and bio-information measuring method
Jae Min Kang, Seoul (KR); Yong Joo Kwon, Yongin-si (KR); and Sang Yun Park, Hwaseong-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Sep. 24, 2021, as Appl. No. 17/484,715.
Application 17/484,715 is a division of application No. 16/268,072, filed on Feb. 5, 2019, granted, now 11,234,647.
Claims priority of application No. 10-2018-0089784 (KR), filed on Aug. 1, 2018.
Prior Publication US 2022/0008009 A1, Jan. 13, 2022
Int. Cl. A61B 5/00 (2006.01); A61B 5/02 (2006.01); A61B 5/0205 (2006.01); A61B 5/021 (2006.01); A61B 5/024 (2006.01); A61B 5/1172 (2016.01); A61B 5/16 (2006.01); G06V 40/13 (2022.01)
CPC A61B 5/6843 (2013.01) [A61B 5/02007 (2013.01); A61B 5/0205 (2013.01); A61B 5/1172 (2013.01); A61B 5/165 (2013.01); G06V 40/1306 (2022.01); A61B 5/02108 (2013.01); A61B 5/02427 (2013.01)] 19 Claims
OG exemplary drawing
 
13. A blood pressure measuring method, comprising:
obtaining by a fingerprint sensor, a first fingerprint image and a second fingerprint image of a user at a first time point and a second time point, respectively;
obtaining a pulse wave signal from the user by using a pulse wave sensor comprising a plurality of light sources and a plurality of light detectors which are arranged to face the plurality of light sources across the fingerprint sensor;
at a reference time point, measuring a statistic value of all pixel intensities of the fingerprint sensor as a threshold value;
during a blood pressure measurement, measuring all pixel intensities of the first fingerprint image and the second fingerprint image, which are obtained at the first time point and the second time point, respectively, while the display provides guide information to prompt the user to change a contact pressure as a time transitions from the first time point to the second time point;
determining a first area of pixels and a second area of pixels having intensities values greater than or equal to the threshold value, among all the pixel intensities that are measured at the first time point and the second time point, respectively;
estimating a size of a contact area between the user and the pulse wave sensor during the measurement of the pulse wave signal based on fingerprint information; and
extracting a fingerprint feature point from each of the first fingerprint image and the second fingerprint image;
update the guide information provided from the display, based on a contact state that represents a distance between the extracted fingerprint feature point and a center position of the fingerprint sensor; and
obtaining blood pressure based on the pulse wave signal and the size of the contact area,
wherein the plurality of light sources is arranged along a first side of the fingerprint sensor, while the plurality of light detectors is arranged along a second side of the fingerprint sensor that is opposite to the first side, so that the plurality of light detectors directly face the plurality of light sources across the fingerprint sensor in a one-to-one correspondence, and
wherein the display is configured to display the guide information prompting the user to simultaneously touch a center of the fingerprint sensor and the pulse wave sensor comprising the plurality of light sources and the plurality of light detectors, while adjusting the contact pressure during the blood pressure measurement.