US 12,188,824 B2
Method and electronic device for detecting wearing using polarization
Jeahyuck Lee, Suwon-si (KR); and Hyunguk Yoo, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on May 17, 2022, as Appl. No. 17/746,335.
Application 17/746,335 is a continuation of application No. PCT/KR2022/002899, filed on Mar. 2, 2022.
Claims priority of application No. 10-2021-0062764 (KR), filed on May 14, 2021.
Prior Publication US 2022/0364924 A1, Nov. 17, 2022
Int. Cl. G01J 4/04 (2006.01); A61B 5/024 (2006.01)
CPC G01J 4/04 (2013.01) [A61B 5/02427 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An electronic device, comprising:
a lighting-emitting diode (LED) configured to emit light of a first polarization direction;
a first photodiode configured to receive the light emitted from the LED through a first polarizer having the first polarization direction;
a second photodiode configured to receive the light emitted from the LED through a second polarizer having a second polarization direction perpendicular to the first polarization direction;
a third photodiode configured to receive the light emitted from the LED without a polarizer;
at least one processor; and
memory storing instructions, that when executed by the at least one processor, cause the electronic device to:
determine whether the electronic device is worn on a living object, based on luminous intensity of light sensed from each of the first photodiode and the second photodiode,
in response to determining that the electronic device is worn on the living object, determine, a wearing state of the electronic device representing a degree of tightness with which the electronic device is worn on the living object, to be one of a first wearing state indicating a first degree of tightness or a second wearing state indicating a second degree of tightness, based on the luminous intensity of the light sensed from the first photodiode and the luminous intensity of the light sensed from the second photodiode, wherein the first degree of tightness is greater than the second degree of tightness,
in response to determining the wearing state of the electronic device to be the second wearing state, monitor whether a motion of the electronic device occurs based on a change in the luminous intensity of the light sensed from the second photodiode,
select a photodiode among from the first photodiode, the second photodiode, and the third photodiode, based on at least one of the wearing state of the electronic device or occurrence of motion, and
measure a biosignal using a signal sensed by the selected photodiode.