Abstract: A biometric skin contact sensor comprising an array of sensor pixels, wherein each sensor pixel comprises: a capacitive sensing electrode for accumulating a charge in response to proximity of a conductive object to be sensed; a reference capacitor connected to the capacitive sensing electrode; a sense voltage-controlled impedance, VCI, having a control terminal connected to a connection between the capacitive sensing electrode and the reference capacitor, the sense VCI having an impedance controlled by its control terminal voltage, and wherein the pixel is arranged so that, in response to a select voltage being applied to the pixel, the control terminal voltage of the sense VCI indicates the proximity of the conductive object to be sensed; and biasing circuitry comprising a one-way conduction path from a bias voltage connection to the control terminal of the sense VCI so that current flows from the bias voltage towards the control terminal of the sense VCI in response to the control terminal voltage of the se

Abstract: A sensor array (10) comprising a plurality of touch sensitive pixels, each pixel (12) comprising a capacitive sensing electrode (14) and a reference capacitor (16) connected in series with the capacitive sensing electrode (14) to provide an indicator voltage that is indicative of the proximity of a conductive object to be sensed.

Abstract: The present disclosure provides a pixel structure comprising a plurality of layers for providing a touch sensitive pixel of a sensing array. The layers comprising: a thin film transistor; and a conductive layer deposited on a dielectric shield to be touched by an object to be sensed and arranged to provide a capacitive sensing electrode coupled to the thin film transistor. The present disclosure also provides methods of manufacturing such a pixel structure.

Abstract: A method to authenticate a user by means of a fingerprint sensor, which is capable of simultaneously acquiring the fingerprints of a hand, the method comprising: an enrollment process (100), during which the features of first fingerprints (Ei) of the fingers of the hand are acquired (101-103), a variation model (Gij) indicating a plausible mutual position variation for each pair of first fingerprints (Ei, Ej) is determined (104) based on the respective features and stored (105); and a comparison process (200), during which features of successive fingerprints (Ei, Ej) of the fingers of the hand are acquired (201-203), a degree of similarity between each one of the first fingerprints (Ei) and each one of the successive fingerprints (Ck) is determined (204) based on a comparison of the respective features, a degree of plausibility of mutual position of pairs of fingerprints (<Ei,Cki>, <Ej,Ckj>) of a set (P) of pairs of fingerprints, each comprising one of the first fingerprints (Ei) and that of the s