Thermal flexible foil-fingerprintsensor

14‐1: Flexible Large‐Area Multi‐Fingerprint Sensors based on Thermal Mass Detection

“…Thermal sensing on the contrary overcomes these problems, but it creates only a transient image [6,7]. When the finger is applied to the sensor for more than 3s, the sensor is at thermal equilibrium under the finger and there is no more observable differentiation between valleys and ridges.…”