Abstract: A device includes a touch-mode biometric sensor having a first side facing toward a user and a second side opposite to the first side, and a display arranged under the touch-mode biometric sensor and adjacent to the second side and configured to display an image in response to a sensing result, associated with a biometric feature of the user, of the touch-mode biometric sensor.

Abstract: A fingerprint signal processing system for a fingerprint sensor includes a calibration control circuit, a register circuit, a decode circuit and a normalization circuit. The calibration control circuit is configured to receive a background calibration control signal and an image signal from the fingerprint sensor, and convert the image signal into a plurality of digital signals according to a plurality of offsets. When the background calibration control signal is at a high level, the calibration control circuit is configured to read a plurality of calibration parameters from the register circuit.

Abstract: A sensor device includes a biometric sensor, which includes a substrate and a plurality of sensing electrodes over the substrate. The sensor device also includes an amplifier electrically coupled to the biometric sensor and configured to provide an output signal in response to a touch event received by the biometric sensor. The sensor device further includes an interface circuit arranged between the amplifier and the plurality of sensing electrodes.

Abstract: The invention provides a voltage sensing fingerprint recognition device and a fingerprint recognition method thereof. The voltage sensing fingerprint recognition device includes: a sensor arranged on a substrate, and the sensor including a plurality of sensing pads, the sensing pads respectively arranged in a plurality of rows, and each row having at least two sensing pads, each sensing pad receiving a trigger voltage; and a voltage receiver, electrically connected to each sensing pad; when the voltage receiver captures one sensed voltage value of the sensing pads in any row, the sensing pads in the row stop receiving the trigger voltage. The present invention does not require an additional frame, so it is applied to the display surface of electronic products.

Abstract: The fingerprint recognition device of the present invention includes: a substrate; a sensor located on the substrate and the sensor including a plurality of sensing finger touch pads around thereof; an oscillator, electrically connected to the plurality of sensing finger touch pads, and outputting at least one oscillating frequency signal; a timer outputting a clock signal to the oscillator; and a counting and digital comparator, counting and comparing the oscillating frequency signals. The fingerprint recognition method of the present invention includes: the oscillator receiving the clock signal and outputting the oscillation frequency signal; a finger touching the plurality of sensing finger touch pads; and counting and comparing the oscillation frequency signal and the oscillation frequency signal after the touch. The present invention is applied to the display surface of the electronic product, and detects whether the finger touches the fingerprint recognition device.

Abstract: A fingerprint detecting apparatus and method process a fingerprint image based on an offset value and a gain value to produce a digital image. The fingerprint detecting apparatus and method are capable of adjusting the offset value without finding out a largest pixel number of multiple grayscale values. Alternatively, the offset value and the gain value corresponding to the offset value are selected to enhance the quality of the digital image.

Abstract: A fingerprint sensor is disclosed. The fingerprint sensor includes a sensor plate, a voltage source, a control circuit and a first conductive plate. The sensor plate detects a first capacitance in response to a touch event on the fingerprint sensor. The voltage source establishes a predetermined voltage difference between a first node and a second node. The control circuit, connected to the sensor plate via the first node, charges a first capacitor associated with the first capacitance during a charge period, and discharges the first capacitor during a discharge period. The first conductive plate, separated from the sensor plate, is coupled with the voltage source via the second node. During the charge period and the discharge period of the control circuit, a voltage difference between the sensor plate and the first conductive plate is maintained at the predetermined voltage difference.

Abstract: A method and circuit for fingerprint detection perform a first round of edge detection with a first parameter, and if a first value obtained during the first round of edge detection does not satisfy a predetermined threshold, perform a second round of edge detection with a second parameter, so as to allow a fingerprint that is not acceptable for the first parameter to be accepted for fingerprint recognition. If a second value obtained during the second round of edge detection does not satisfy the predetermined threshold neither, it is determined that the object subject to fingerprint detection is not a finger.

Abstract: In a fingerprint sensor, two adjacent sensing plates are detected at a same time to obtain first sensing data and second sensing data therefrom respectively, so that the first sensing data and the second sensing data include a same noise, then the first sensing data is subtracted from the second sensing data to generate a difference by which the noise is eliminated, and the difference is added to first fingerprint data corresponding to the sensing plate which provides the first sensing data, resulting in second fingerprint data corresponding to the other sensing plate. The fingerprint portions on the two adjacent sensing plates are determined according to the first and the second fingerprint data respectively.

Abstract: A storage device capable of fingerprint identification includes a first storage, a first controller and a second storage. The first storage is configured to store a registered fingerprint. The first controller is configured to compare the registered fingerprint with an input fingerprint, wherein the input fingerprint is obtained in response to a touch event. The second storage is configured to store a data. The data is, in response to a fingerprint comparison result, selectively allowed to be accessible or prohibited from being accessible to a host.

Abstract: A fingerprint sensor includes a substrate, a sensing electrode over the substrate, a first electrode and a second electrode. The sensing electrode is configured to detect a capacitance in response to a touch event on the fingerprint sensor. The first electrode is disposed between the substrate and the sensing electrode, while the second electrode is disposed between the first electrode and the sensing electrode. The first electrode and the second electrode are configured to define a capacitance therebetween. The sensitivity of the fingerprint sensor is inversely proportional to the capacitance between the first electrode and the second electrode.

Abstract: A fingerprint sensor is disclosed. The fingerprint sensor includes a substrate, a sensing electrode, a shielding plate, a first pair of conductive plates and an amplifier. The sensing electrode is configured to detect a capacitance in response to a touch event on the fingerprint sensor, and configured to selectively receive or not receive an input voltage. The shielding plate is configured to selectively receive the input voltage or is coupled to a reference voltage level. The first pair of conductive plates includes a first plate selectively coupled to the sensing electrode. The amplifier includes an inverting terminal coupled to a second plate of the first pair of conductive plates, and a non-inverting terminal to receive a voltage that is a fraction of the input voltage. The sensitivity of the fingerprint sensor is directly proportional to the input voltage.

Abstract: A sensing device includes a substrate, a sensing component and a shielding device. The sensing component is configured to detect a touch capacitance in response to a touch event on the sensing device. The shielding device, between the substrate and the sensing component, is configured to distribute electrical energy, and shield the substrate from the sensing component.

Abstract: A fingerprint sensor includes a first reference capacitor, a second reference capacitor, a first capacitor and a second capacitor. A first reference voltage is established across the first reference capacitor. The first reference voltage is depended on a touch event, a first reference capacitance of the first reference capacitor and a stray capacitance. The second reference capacitor has a first end and a second end, and is being configured to maintain a voltage difference between the first end and the second end, the voltage difference being a function of the first reference voltage. The first capacitor has a first capacitance and is coupled to the first end. The second capacitor has a second capacitance and is selectively coupled in parallel with the first capacitor. The ratio of the stray capacitance to the first reference capacitance equals the ratio of the second capacitance to the first capacitance.

Abstract: A finger detection device and method of a fingerprint recognition IC is disclosed. The device comprises sensing electrodes, a capacitive sensing layer, a signal processing circuit, a multiplexer module and a signal register. The sensing electrodes are defined as a fingerprint sensing zone. The capacitive sensing layer covers the sensing electrodes. The signal processing circuit is arranged below and electrically connected with the sensing electrodes. The multiplexer module defines a finger detection zone. The finger detection zone includes at least one of the sensing electrodes. The signal register is electrically connected with the signal processing circuit, receiving a detection signal generated by the finger detection zone and comparing the detection signal with a preset value. The finger detection device uses only a portion of the sensing electrodes to detect a finger approaching/contacting it to determine triggering or sleeping of the fingerprint recognition IC and thus reduces power consumption.

Abstract: A finger sensing structure for a capacitive fingerprint recognition IC is provided here. The structure comprises a finger sensing metal layer with fish bone shape. When fingers approach or touch the surface of the capacitive fingerprint recognition IC, capacitive sense is induced between the fingers and the metal patterned layer to wake up the IC. Before the fingers approach or touch the IC, the IC is hibernated; once the fingers are detected, the IC is woken up. The metal patterned layer can reduce energy consumption of the IC especially for portable fingerprint recognition IC.