Title :
Low temperature polycrystalline silicon TFT fingerprint sensor with integrated comparator circuit
Author :
Hara, Hiroyuki ; Sakurai, Mikio ; Miyasaka, Mitsutoshi ; Tam, Simon W B ; Inoue, Satoshi ; Shimoda, Tatsuya
Author_Institution :
Technol. Platform Res. Center, Seiko Epson Corp., Nagano, Japan
Abstract :
We have developed a low-temperature polycrystalline silicon thin film transistor (LTPS-TFT) fingerprint sensor (FPS) based on a newly clarified detection principle and a unique driving scheme. We have also integrated a comparator circuit onto a glass substrate for the first time. The circuit recognizes ridges and valleys in a fingerprint. Using this system, we have succeeded in taking fine fingerprint images at 4 V operation. This fingerprint sensor is suitable for mobile applications that require thin devices that are low cost and low power.
Keywords :
capacitive sensors; comparators (circuits); driver circuits; fingerprint identification; low-power electronics; thin film transistors; 4 V; LTPS-TFT; Si; TFT driver circuits; TFT fingerprint sensor; biometrics; capacitance sensing; fingerprint ridge/valley recognition; glass substrate; integrated comparator circuit; low power devices; low temperature polycrystalline silicon TFT; mobile authentication equipment; thin devices; Circuits; Costs; Fingerprint recognition; Glass; Image matching; Silicon; Substrates; Temperature sensors; Thin film sensors; Thin film transistors;
Conference_Titel :
Solid-State Circuits Conference, 2004. ESSCIRC 2004. Proceeding of the 30th European
Print_ISBN :
0-7803-8480-6
DOI :
10.1109/ESSCIR.2004.1356703
