篇題：Light-Controlled Gap-Type TFT Used for Large-Area Under-Screen Fingerprint Sensor
文章出處：
IEEE Journal of the Electron Devices Society, VOL. 9, PP. 517-520, 2021
DOI: 10.1109/JEDS.2021.3076832
作者： Ya-Hsiang Tai*, Cheng-Che Tu, Yi-Cheng Yuan, Yu-Jia Chang, Mao-Hsiu Hsu, and Che-Yu Chuang
任職單位及部門：陽明交通大學光電工程學系
In the fierce market competition of different biometric methods in smartphones, where consumers are pursuing a high screen ratio,
optical fingerprint recognition under OLED screen is a well-established approach. However, using thin-film transistor (TFT) technology to make
large-area optical sensors generally has the issue of low sensitivity, which will make the signal difficult to be read out. In this paper, we propose to
use gap-type TFT with high photosensitivity current and process
compatible with display panels as the sensing device to build the sensing array. The pixel circuit can be simplified to structure containing only of two
thin-film transistors (TFTs). Using this gap-type TFT sensing array under
OLED panel for fingerprint recognition is proven to be effective by the clear images captured with the readout system.
文章摘要：
在智能手機不同生物識別方法的激烈市場競爭中，消費者追求高屏佔比，OLED屏幕下的光學指紋識別是一種行之有效的方法。然而，使用
薄膜電晶體（TFT）技術製作大面積光學傳感器普遍存在靈敏度低的問題，這會使信號難以讀出。在本文中，我們提出使用具有高光敏電
流, 且其製造流程與顯示面板兼容的間隙型TFT作為感測器件月田山來構建感測陣列。像素電路可以簡化為僅包含兩個TFT的結構。通過
讀取系統擷取的清晰圖像，證明在 OLED 面板下使用這種間隙型 TFT 感應陣列進行指紋識別是有效的。