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.

中文翻译：

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用于大面积屏下指纹传感器的光控间隙型TFT

在智能手机中使用不同生物识别方法的激烈市场竞争中，消费者追求高屏幕比例，OLED屏幕下的光学指纹识别是一种行之有效的方法。然而，使用薄膜晶体管（TFT）技术制造大面积光学传感器通常存在灵敏度低的问题，这将使信号难以读出。在本文中，我们建议使用具有高光敏电流的间隙型TFT和与显示面板兼容的工艺作为传感装置来构建传感阵列。像素电路可以简化为仅包含两个薄膜晶体管（TFT）的结构。通过使用读出系统捕获的清晰图像，已证明在OLED面板下使用这种间隙型TFT感应阵列进行指纹识别是有效的。