| 摘要 |
Disclosed is a capacitive fingerprint sensor in which a difference between capacitances is primarily sensed and amplified, and an amplified signal within a pixel is secondarily amplified again, thereby being capable of enhancing sensing sensitivity, and depending on the enhancement of the sensing sensitivity, a protective film of an upper part of the sensor can increase in thickness, thereby realizing an effect which is resistant to ESD damage and a physical impact. The capacitive fingerprint sensor according to the exemplary embodiments of the present invention includes: a fingerprint sensing electrode Cfp for sensing a human fingerprint; a first transistor T1 in which the amount of currents flowing therethrough changes depending on an output voltage of the fingerprint sensing electrode Cfp; a second transistor T2 in which the amount of currents flowing therethrough changes due to a difference between the currents flowing through the first transistor T1; and a third transistor T3 which resets a gate electrode of the first transistor T1 and provides capacitive coupling with the gate electrode of the first transistor T1 via a pulse signal. |
