CPC A61B 5/6843 (2013.01) [A61B 5/0205 (2013.01); A61B 5/681 (2013.01); A61B 5/6898 (2013.01); A61B 5/742 (2013.01); A61B 5/7485 (2013.01); G01L 5/0038 (2013.01); A61B 5/02007 (2013.01); A61B 5/02108 (2013.01); A61B 5/02427 (2013.01); A61B 5/165 (2013.01); A61B 2560/0223 (2013.01)] | 17 Claims |
1. An apparatus for estimating bio-information, the apparatus comprising:
a touch screen configured to generate touch data when the touch screen is touched by an object;
a photoplethysmography (PPG) sensor configured to measure a PPG signal from the object during a bio-information measurement;
a force sensor configured to measure a force exerted by the object to the PPG sensor during the bio-information measurement;
a processor configured to:
during calibration, obtain a reference contact area between the object and the touch screen, based on the touch data that is generated by the touch screen to represent a light intensity of each of a plurality of pixels of the touch screen, by determining one or more pixels that have the light intensity greater than a threshold value as the reference contact area, among the plurality of pixels;
during the bio-information measurement, obtain a contact pressure based on the force that is obtained during the bio-information measurement, and the reference contact area between the object and the touch screen that is obtained during the calibration and stored in the apparatus; and
estimate the bio-information based on the contact pressure and the PPG signal; and
a storage configured to store the reference contact area,
wherein the processor is further configured to, when the PPG signal is measured, retrieve the reference contact area from the storage.
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