Browsing by Author "Lu, Chih-Wen"

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A 368 x 184 Optical Under-Display Fingerprint Sensor With Global Shutter and High-Dynamic-Range Operation
(2020-01-01)
Yin, Ping-Hung
;
Lu, Chih-Wen
;
Wang, Jia-Shyang
;
Chang, Keng-Li
;
Lin, Fu-Kuo
This study proposes a 368 x 184 optical underdisplay fingerprint sensor designed and prototyped using 0.11-mu m CIS technology. The prototype sensor with global shutter operation and an ADC-embedded in an 8-pixel configuration features low noise, low-power consumption, fast response time, and a smaller signal processing circuit area. Two sets of memory (184 x 92 bytes) are also embedded in the pixel array to save external memory cost. A dynamic range of 126 dB is achieved with 8-segment auto exposure and dark level adjustment with programmable gain control. The prototype fingerprint sensor was successfully embedded in a mobile phone for functional verification, and the power consumption was only 25 mW with a 3.3 V supply voltage. The sensor has a chip size of 9.74 mm x 4.6 mm, a resolution of 1154 dpi, and a sensing area of 73%.
Synthesis and Molecular Properties of Two Isomeric Dialkylated Tetrathienonaphthalenes
(2016-02-05)
Chang, Shao-Ling
;
Lu, Chih-Wen
;
Lai, Yu-Ying
;
Hsu, Jhih-Yang
;
Cheng, Yen-Ju
Isomeric 2,8-distannyl 5,11-didodecyl alpha/beta-TTN (1, tetrathienonaphthalene = TTN) and 2,8-didodecyl 5,11-distannyl alpha beta-TTN (2) have been designed and successfully synthesized. The naphthalene core structures in alpha beta-TTNs were constructed by a systematic protocol using PtCl2-catalyzed cyclization followed by oxidative Scholl annulation in good yields. Compared to the one-dimensional naphthodithiophene derivatives, the two-dimensional alpha beta-TTN molecules showed good solubility, extended conjugation, strong absorptivity, and highly coplanar structures. Compounds 1 and 2 were polymerized with a 5,5\'-dibromo-2,2\'-bithiophene-based monomer to afford 2,8-alpha beta-PTTNTT and 5,11-alpha beta-PTTNTT copolymers. 2,8-alpha beta-PTTNTT with the alpha-aNDT moiety in the main chain exhibited a higher hole mobility of 1.26 X 10(-2) cm(2) V-1 s(-1).