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Alternately Controlled Optical Pixel Sensor System Using Amorphous Silicon Thin-Film Transistors
IEEE Transactions on Industrial Electronics ( IF 7.7 ) Pub Date : 2019-09-01 , DOI: 10.1109/tie.2018.2880718
Chih-Lung Lin , Chia-En Wu , Chia-Lun Lee , Fu-Hsing Chen , Yu-Sheng Lin , Wan-Lin Wu , Jian-Shen Yu

This paper presents an optical pixel sensor system that uses hydrogenated amorphous silicon (a-Si:H) photo thin-film transistors (TFTs) for innovating the user interface of displays with optical input functions. The proposed optical pixel sensor applies photo TFTs that are combined with one primary color filter (red, green, or blue) to determine the input signal to the optical sensor. Other photo TFTs covered with filters of other colors are utilized to provide compensating photocurrents for achieving a robust optical input function with a high signal-to-noise ratio under intense ambient white light. To improve the lifetime of the sensor and the degradation of photo TFTs under constant drain-to-source voltage (VDS) bias stress, an alternately controlled sensing structure is proposed to reduce the effective stress time of the photo TFTs. The optical characteristics and the degradation of a-Si:H photo TFTs under VDS stress with different duty ratios are investigated to verify the effect of reduced stress time on photo TFTs. Measurements further reveal that the proposed optical sensor achieves a significant initial difference in output voltages under high-intensity ambient white light of 13 230 lx, and that the difference remains high after 408 h of long-term operation at 70 °C, demonstrating the feasibility of the alternately controlled sensing structure and the long-term reliability of the sensor.

中文翻译:

使用非晶硅薄膜晶体管的交替控制光学像素传感器系统

本文介绍了一种光学像素传感器系统,该系统使用氢化非晶硅 (a-Si:H) 光电薄膜晶体管 (TFT) 来创新具有光学输入功能的显示器的用户界面。提议的光学像素传感器应用与一个原色滤光片(红色、绿色或蓝色)相结合的光电 TFT,以确定光学传感器的输入信号。其他覆盖有其他颜色滤光片的光电 TFT 用于提供补偿光电流,以在强烈的环境白光下实现具有高信噪比的稳健光学输入功能。为了提高传感器的寿命和在恒定漏源电压 (VDS) 偏置应力下光电 TFT 的退化,提出了一种交替控制的传感结构来减少光电 TFT 的有效应力时间。研究了不同占空比的 VDS 应力下 a-Si:H 光 TFT 的光学特性和退化,以验证减少应力时间对光 TFT 的影响。测量进一步表明,所提出的光学传感器在 13 230 lx 的高强度环境白光下实现了显着的输出电压初始差异,并且在 70 °C 下长期运行 408 小时后差异仍然很大,证明了可行性交替控制的传感结构和传感器的长期可靠性。
更新日期:2019-09-01
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