Publication number: 20090054752
Abstract: A photoplethysmographic sensing system for determining a user's pulse rate includes a light emitting device (100, 201, 310, 500) including a first plurality of light emitting particles (108, 208, 317) having a first diameter and emitting light having a first wavelength. A detector (118, 218, 500) is positioned to receive light emitted from the plurality of light emitting particles (108, 208, 317) and a processing device (500) determines the pulse rate. The light emitting device (100, 201, 310, 500) and the detector (118, 218, 500) are disposed on a flexible polymeric material (102, 202, 334). The light emitting device (100, 201, 310, 500) may include a second plurality of light emitting particles (108, 208, 317) having a second diameter and emitting light having a second wavelength, wherein the processing device (500) determines the user's blood oxygen level. The light emitting particles (108, 208, 317) may comprise one of quantum dots, electroluminescent particles, or organic particles.
Type:
Application
Filed:
August 22, 2007
Publication date:
February 26, 2009
Applicant:
MOTOROLA, INC.
Inventors:
Krishna Jonnalagadda, Di-An Hong, Xun Luo, Francesca Schuler, Andrew Skipor