Capacitive sensor pixel circuit with single transistor for touch‐fingerprint recognition sensor | Zendy

Kang I.H. | Zendy; Hong M.T. | Zendy; Bae B.S. | Zendy

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Capacitive 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 , electro optical sensor , fingerprint (computing) , fingerprint recognition , image sensor , transistor , electrical engineering , computer science , electronic engineering , proximity sensor , computer hardware , artificial intelligence , engineering , voltage

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.

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