A biometric authentication device uses IR-VCSELs as light sources for performing biometric authentication by providing clear images. A light guide module is introduced to minimize the size of the device. Moreover, the biometric authentication device uses a single image sensing module to gather a vein image and a fingerprint image into the same detection signal which is then analyzed and compared with the pre-stored vein feature data and fingerprint feature data.

Introduced here are multi-channel light sources able to produce a broad range of electromagnetic radiation. A multi-channel light source (also referred to as a “multi-channel emitter”) can be designed to produce visible light and/or non-visible light. For example, some embodiments of the multi-channel light source include illuminant(s) capable of emitting electromagnetic radiation within the visible range and illuminant(s) capable of emitting electromagnetic radiation in a non-visible range, such as the ultraviolet range or infrared range. By capturing images in conjunction with the visible and non-visible light, additional information on the ambient scene can be gleaned which may be useful, for example, during post-processing.

An ambient light filter configured to filter ambient light noises from an optical current that is at least partially caused by an optical pulse sequence emitted by a light emitting device, can include: a sample and detection circuit configured to sample the optical current and to obtain a current component in a first mode, and to remove the current component from the optical current and to generate a detection signal in a second mode; a current amplifier configured to receive the detection signal, and to generate an amplified current signal; and a control circuit configured to switch the sample and detection circuit between the first and second modes, where the control circuit switches the sample and detection circuit to the first mode in at least one optical pulse gap, and switches the sample and detection circuit to the second mode when a next optical pulse arrives.

Technologies are presented herein in support of a system and method for performing fingerprint recognition. Embodiments of the present invention concern a system and method for capturing a user's biometric features and generating an identifier characterizing the user's biometric features using a mobile device such as a smartphone. The biometric identifier is generated using imagery captured of a plurality of fingers of a user for the purposes of authenticating/identifying the user according to the captured biometrics and determining the user's liveness. The present disclosure also describes additional techniques for preventing erroneous authentication caused by spoofing. In some examples, the anti-spoofing techniques may include capturing one or more images of a user's fingers and analyzing the captured images for indications of liveness.

An unlocking method and a mobile terminal are provided. The unlocking method includes: in the case that a mobile terminal is locked, a touch chip determines whether a fingerprint verification operation is detected; in the case that the fingerprint verification operation is detected, the touch chip sends control signals to a central processor and a fingerprint driving chip; the fingerprint driving chip drives, in response to the control signal, a fingerprint sensor to collect fingerprint information, and determines whether the collected fingerprint information matches preset fingerprint information; and if so, the central processor unlocks the mobile terminal in response to a second control signal and a determination result from the fingerprint driving chip.

Provided are a fingerprint reading device and a fingerprint reading method that can appropriately read a fingerprint even when reading a fingerprint of a relatively soft finger that may be easily subjected to significant elastic deformation. The fingerprint reading device includes: a placement portion on which a finger is placed, provided with a reading face so as to be able to move between first and second positions; a drive unit that causes the reading face to move between the first and second positions; and a reading unit that reads a fingerprint when the reading face is positioned at the first position, the drive unit causes the reading face to move to the second position and further move from the second position to the first position, and the reading unit reads a fingerprint when the reading face has moved from the second position to the first position.

A method (700) for verifying liveness of a finger (102) of a user by capturing a first fingerprint sample (402) from the finger (102) placed on a display (104) by using a first sensor (106) placed under the display (104). The method (700) may comprise transmitting (702) light, by using a first light transmitting display area of the display (104), towards a first area of the finger (102), wherein the first light transmitting display area (108) is smaller than a first sensor area; capturing (704) reflected light from the finger (102) by the first sensor (104), wherein the reflected light (114) is transmitted through the display (104); and identifying (706) a first feature of the first fingerprint sample (402) by using the reflected light (114), wherein the first feature comprises scattered light from the finger (102), wherein the light transmitted from the display (104) comprises a first light component with a first wavelength from a first area of the display (104).

A detection device includes a plurality of optical sensors arranged in a detection area, a light source configured to emit light that is emitted to an object to be detected and is detected by the optical sensors, and a processor configured to perform processing based on outputs from the optical sensors. The processor is configured to determine, based on the outputs of the respective optical sensors obtained at a cycle of a predetermined period, an optical sensor an output of which is to be employed from among the optical sensors.

The present disclosure provides a fingerprint image sensor and a method for optical wireless communications using the same. The fingerprint image sensor includes: a backlight plate; an image sensor unit, disposed above the backlight plate; and a protection layer, disposed above the image sensor substrate; wherein the fingerprint image sensor is configured to operate at least in a transmitting mode and a receiving mode, where in the transmitting mode, the backlight plate is turned on and configured to emit lights with different optical characteristics representing coded information, and in the receiving mode, the backlight plate is turned off and the image sensor unit senses external lights and convert the external lights to electric signals. The present disclosure further provides methods for transmitting and receiving information using the fingerprint image sensor. Accordingly, the fingerprint image sensor can work as a transceiver to realize optical wireless communications.

A fingerprint identification module includes a lens, an optical sensor, and a light filtering component located between the lens and the optical sensor, where a thickness of an edge area of the light filtering component is greater than a thickness of a central area of the light filtering component, and a thickness of the light filtering component decreases gradually along a direction from the edge area to the central area.