| http://www.w3.org/ns/prov#value | - On the other hand, with a sensing device according to the invention, optical sensors, for example comprising LEDs and a photodetector, can be positioned behind the substrate of the device and, utilising the transparency of the device, additional biometric characteristics, such as pulse, blood oxygen levels, finger temperature or skin colouring, sensed optically through the array using a reflective
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