On-Display Transparent Half-Diamond Pattern Capacitive Fingerprint Sensor Compatible With AMOLED Display

Citation data:

IEEE Sensors Journal, ISSN: 1530-437X, Vol: 16, Issue: 22, Page: 8124-8131

Publication Year:
2016
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/20720
DOI:
10.1109/jsen.2016.2605125
Author(s):
Ma, Hyunggun, Liu, Zhenyi, Heo, Sanghyun, Lee, Jeeyoon, Na, Kyungmin, Jin, Han Byul, Jung, Sungchul, Park, Kibog, Kim, Jae Joon, Bien, Franklin
Publisher(s):
Institute of Electrical and Electronics Engineers (IEEE), IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Tags:
Physics and Astronomy, Engineering, On-display sensor, half-diamond pattern, fingerprint sensor, biometric sensor
article description
The need for personal security in portable devices has increased. Among several biometric sensing technologies, fingerprint sensing is the most highlighted method. However, fingerprint sensor in electronics is stifling the demands for a larger interactive display. In this paper, the bottlenecks of placing the sensor on display is discussed, and an on-display mutual capacitive high-resolution transparent fingerprint sensor with a half-diamond pattern is proposed for adapting to the needs of personal security on a larger screen. To overcome various performance limitations on the on-display fingerprint sensor, a metal mesh is used as an electrode material, and the half-diamond pattern is applied. The proposed pattern is compatible with the diamond-patterned AMOLED display. The proposed sensor has 72 × 72 channels in a 6 mm × 6 mm area. The sensor satisfies the criteria set by the FBI for fingerprint sensing with 322 capacitors per inch, and the measured transmittance in the visible light region is 79.7%. The proposed sensor achieved a capacitance variation 2.3 times larger than that achieved by the conventional sensor. The 5-channel fingerprint sensing circuit to examine the feasibility of fingerprint detection is fabricated with the TSMC 0.18-μm process.