材料科学
点间距
发光二极管
薄膜晶体管
光电子学
脉冲宽度调制
信号(编程语言)
电子工程
电压
像素
电气工程
计算机科学
物理
光学
工程类
纳米技术
程序设计语言
图层(电子)
作者
Ya Lin,Chun Liu,Jinhui Zhang,Yikai Yuan,Wei Cai,Lei Zhou,Miao Xu,Lei Wang,Weijing Wu,Junbiao Peng
标识
DOI:10.1109/ted.2021.3112947
摘要
This article presents a new micro-light-emitting diode (LED) pixel circuit driven by the digital pulsewidth modulation (PWM) method, in which the threshold voltage compensation of the driving thin-film transistor (TFT) is included. A scan driver integrated by metal oxide (MO) TFTs is also designed to provide the scan signals for pixel circuits array. A micro-LEDs array with $76\,\, \times $ BBB $\times \,\,78$ and a scan driver with 80 stages are simultaneously fabricated by MO TFTs backplane with back-channel etch (BCE) structure. A respective micro-LED display is consequently realized by a peripheral driving system based on a field-programmable gate array (FPGA), which is used as a core control unit to synchronize the scan signals with the data signals. It is shown that the micro-LED in the pixel circuit can operate at a constant current even at the 5- $\mu \text{s}$ pulsewidth of the emission (EM) signal. The micro-LED display can achieve 256 linear grayscales with an approximately 60 Hz flash rate under the minimum pulsewidth of 40 $\mu \text{s}$ of EM signal.
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