DEVICE AND METHOD FOR RECOGNIZING FINGERPRINT

摘要

PURPOSE: A device and method for recognizing a fingerprint is provided to detect an inherent fingerprint pattern from a time value necessary for achieving to a specific reference value of a fingerprint signal. CONSTITUTION: If a fingerprint is contacted with a fingerprint sensing device, a fingerprint signal creation unit(110) creates an analogue fingerprint signal(VSP) which reflects a change/discharge characteristic of a fingerprint impedance in each sensing point. The analogue fingerprint signal(VSP) is converted into a digital coefficient signal in a signal conversion unit(120). The digital coefficient signal is processed in a signal processing unit(140). An inherent fingerprint pattern of a corresponding fingerprint is detected. The signal processing unit(140) executes a feedback of a signal process result to a control unit(130). The control unit(130) analyzes the feedback signal and applies a control signal(Sc) to a reference signal generating unit(150) and a clock signal generating unit(160) for detecting a detailed fingerprint pattern. A size of a reference signal(Vref) and a period and a generating time of a clock signal(Sclk) being applied to the signal conversion unit(120) are adjusted by the control signal(Sc). The control unit(130) supplies an enable signal(EN) to the fingerprint signal creation unit(110) and the signal conversion unit(120). The enable signal(EN) is used for adjusting a supply of an electric charge in the fingerprint signal creation unit(110) and used for adjusting a coefficient point of a clock signal in the signal conversion unit(120).