[D-6] Functional Devices and Application

[D-6-02] Development of Small-Area Pixel Circuit with Light-to-Pulse Width Converter for the High-Resolution Smart Skin Display

〇Yuta - Aruga¹, Bang - Du¹, Yaogan - Liang¹, Kouhei - Nakamura¹, Shengwei - Wang¹, Bunta - Inoue¹, Hisashi - Kino², Takafumi - Fukushima¹, Koji - Kiyoyama³, Tetsu - Tanaka^1,2 (1. Dept. of Mechanical Systems Eng., Graduate School of Eng., Tohoku Univ. (Japan), 2. Dept. of Biomedical Eng., Graduate School of Biomedical Eng., Tohoku Univ. (Japan), 3. Dept. of Electrical and Electronics Eng., Nagasaki Inst. of Applied Science (Japan))

Presentation style: Online

https://doi.org/10.7567/SSDM.2022.D-6-02

Photoplethysmography (PPG), a main optical-electrical noninvasive biosignal, is utilized in several wearable devices to achieve daily healthcare and early disease diagnosis. We have proposed a smart skin display with the PPG recording circuit and integrated display LEDs showing subcutaneous vessels for the early diagnosis of vascular disease. A 12 x 12 pixels light-to-pulse width converter circuit, including PPG reading circuits, was developed and evaluated to control the light intensity of display LEDs. The proto-type circuit was designed and fabricated using standard 0.18-µm CMOS technology and was evaluated.