Open AccessCapacitive sensor pixel circuit with single transistor for touch‐fingerprint recognition sensor
Author(s) -
Kang I.H.,
Hong M.T.,
Bae B.S.
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2018.5189
Subject(s) - capacitive sensing , fingerprint (computing) , thin film transistor , fingerprint recognition , image sensor , transistor , sensitivity (control systems) , electrical engineering , computer science , computer hardware , materials science , voltage , electronic engineering , engineering , artificial intelligence , layer (electronics) , composite material
Touch‐based user identity verification is widely used in smartphones, and fingerprint authentication is the most popular method. The authors developed a capacitive type of fingerprint sensor that uses only one amorphous oxide thin film transistor (TFT) that is integrated into a display screen. To achieve a small sensor area, they removed one bus line from the conventional three bus lines and used only one oxide TFT. The proposed sensor shows good sensitivity. The measured voltage difference between a ridge (touch) and a valley (non‐touch) was 5.4 V with an input pulse of 15 V.