Fingerprint recognition circuit and Fingerprint recognition device including the same

摘要

A fingerprint recognition circuit and a fingerprint recognition device including the same are provided. The fingerprint recognition device includes a display outputting a screen, a touch sensor panel detecting a touch on the display, and a fingerprint recognition circuit scanning a fingerprint touched on the display, wherein the fingerprint recognition circuit receives light reflected by the fingerprint. A pixel comprising a photoelectric element receiving light, a low-noise amplifier converting charge input from the photoelectric element to output a signal voltage, and an analog-to-digital converter (ADC) for converting the signal voltage into a digital signal, wherein The ADC is a variable reference voltage generator that provides a variable reference voltage, and a comparator that adds the variable reference voltage to the signal voltage, performs correlated double sampling (CDS), and compares the ramp voltage to output a comparison signal. And a counter for counting the comparison signal and outputting the digital signal.