Abstract: An analog-to-digital converting circuit includes: an analog-to-digital converter suitable for performing an analog-to-digital conversion on pixel signals of a plurality of pixels provided in a pixel array; a ramp signal generator suitable for providing a ramp signal to the analog-to-digital converter; and an auto-zero controller suitable for providing a reference voltage to the analog-to-digital converter to perform an auto-zeroing operation by using a row pixel for which a readout operation is performed by the analog-to-digital converter.

Abstract: An analog-to-digital converting circuit includes: an analog-to-digital converter suitable for performing an analog-to-digital conversion on pixel signals of a plurality of pixels provided in a pixel array; a ramp signal generator suitable for providing a ramp signal to the analog-to-digital converter; and an auto-zero controller suitable for providing a reference voltage to the analog-to-digital converter to perform an auto-zeroing operation by using a row pixel for which a readout operation is performed by the analog-to-digital converter.

Abstract: A fingerprint sensor includes a pixel array, an analog-to-digital converter, and a reference signal generator. The pixel array includes a plurality of unit pixels arranged in rows and columns, and each of the plurality of unit pixels generates an analog signal by detecting a fingerprint of a user. The analog-to-digital converter performs an analog-to-digital conversion operation on the analog signal to generate a digital signal. The analog-to-digital converter is configured to perform the analog-to-digital conversion based on a reference signal. The reference signal generator generates the reference signal such that the reference signal decreases at a first rate from a start voltage, and adjusts a magnitude of the start voltage based on the digital signal.

Abstract: A fingerprint sensor includes a pixel array, an analog-to-digital converter, and a reference signal generator. The pixel array includes a plurality of unit pixels arranged in rows and columns, and each of the plurality of unit pixels generates an analog signal by detecting a fingerprint of a user. The analog-to-digital converter performs an analog-to-digital conversion operation on the analog signal to generate a digital signal. The analog-to-digital converter is configured to perform the analog-to-digital conversion based on a reference signal. The reference signal generator generates the reference signal such that the reference signal decreases at a first rate from a start voltage, and adjusts a magnitude of the start voltage based on the digital signal.

Abstract: A fingerprint sensor includes a pixel array, an analog-to-digital converter, and a reference signal generator. The pixel array includes a plurality of unit pixels arranged in rows and columns, and each of the plurality of unit pixels generates an analog signal by detecting a fingerprint of a user. The analog-to-digital converter performs an analog-to-digital conversion operation on the analog signal to generate a digital signal. The analog-to-digital converter is configured to perform the analog-to-digital conversion based on a reference signal. The reference signal generator generates the reference signal such that the reference signal decreases at a first rate from a start voltage, and adjusts a magnitude of the start voltage based on the digital signal.

Abstract: A fingerprint sensor includes a pixel array and a controller. The pixel array includes a plurality of unit pixels arranged in rows and columns, each of the plurality of unit pixels including, a sensing electrode configured to form a detection capacitance with a finger, a signal generation circuit configured to output an analog signal through a column line based on the detection capacitance, and a protection circuit configured to control a voltage transfer between the sensing electrode and a common line. The controller is configured to control the protection circuit in each of the plurality of unit pixels to transfer a voltage at the sensing electrode of an active unit pixel of the plurality of unit pixels to the sensing electrode in at least one protection unit pixel of the plurality of unit pixels through the common line.

Abstract: An image sensor for reducing channel variation and an image processing system including the same. The image sensor includes first to mth pixels (m?2), each of which is connected to a corresponding column line from among first to mth column lines and is configured to output a respective pixel signal.’ The image sensor further includes first to mth bias circuits, each of which is connected to a corresponding column line from among the first to mth column lines and is configured to fix a voltage of the corresponding column line to a bias voltage when a column line-specific pixel is not selected to output the respective pixel signal. An analog-to-digital converter in the image sensor is configured to convert the pixel signals into digital signals.

Abstract: A fingerprint sensor includes a pixel array, an analog-to-digital converter, and a reference signal generator. The pixel array includes a plurality of unit pixels arranged in rows and columns, and each of the plurality of unit pixels generates an analog signal by detecting a fingerprint of a user. The analog-to-digital converter performs an analog-to-digital conversion operation on the analog signal to generate a digital signal. The analog-to-digital converter is configured to perform the analog-to-digital conversion based on a reference signal. The reference signal generator generates the reference signal such that the reference signal decreases at a first rate from a start voltage, and adjusts a magnitude of the start voltage based on the digital signal.

Abstract: A fingerprint sensor includes a pixel array and a controller. The pixel array includes a plurality of unit pixels arranged in rows and columns, each of the plurality of unit pixels including, a sensing electrode configured to form a detection capacitance with a finger, a signal generation circuit configured to output an analog signal through a column line based on the detection capacitance, and a protection circuit configured to control a voltage transfer between the sensing electrode and a common line. The controller is configured to control the protection circuit in each of the plurality of unit pixels to transfer a voltage at the sensing electrode of an active unit pixel of the plurality of unit pixels to the sensing electrode in at least one protection unit pixel of the plurality of unit pixels through the common line.

Abstract: An image sensor for reducing channel variation and an image processing system including the same. The image sensor includes first to mth pixels (m?2), each of which is connected to a corresponding column line from among first to mth column lines and is configured to output a respective pixel signal.’ The image sensor further includes first to mth bias circuits, each of which is connected to a corresponding column line from among the first to mth column lines and is configured to fix a voltage of the corresponding column line to a bias voltage when a column line-specific pixel is not selected to output the respective pixel signal. An analog-to-digital converter in the image sensor is configured to convert the pixel signals into digital signals.

Abstract: A ramp signal generator includes: a row decoder which receives a row control signal from a timing controller and generates one or more row select signals, a first column decoder which receives a first column control signal from the timing controller and generates one or more first column select signals, a second column decoder which receives a second column control signal from the timing controller and generates one or more second column select signals, and a current cell array which is activated by the one or more first column select signals, the one or more second column select signals, and the one or more row select signals, and includes at least one current cell which generates at least one unit current, and generates an output current by summing the generated at least one unit current.