This study aims to develop the Photoplethysmography (PPG) sensor patch for to estimate the heart rate (HR) and blood oxygen (SpO2). A newly developed multi wavelength arrayed flexible OLED-OPD PPG sensing patch elevates the performance of motion artifact for not only for heart rate estimation but also blood oxygen estimation. The PPG sensing patch ensures the long-time continuous monitoring of the PPG signal from the wrist artery during sleeping, walking and cycling. The accuracy of the HRs is 92% and the accuracy of SpO2 is 95%.

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