Long Zhengxing, Yi Zichuan, Zhang Hu, Lv Jinpu, Liu Liming, Chi Feng, Shui Lingling, Zhang Chongfu
College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China.
School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
Micromachines (Basel). 2022 Jun 15;13(6):948. doi: 10.3390/mi13060948.
Electrowetting display (EWD) is a new type of paper-like reflective display based on colored oil, which has gradually become one of the most potential electronic papers with low power consumption, fast response, and full color. However, oil backflow can occur in EWDs, which makes it difficult to maintain a stable aperture ratio. In order to improve the stability of the aperture ratio of EWDs, a new driving waveform was proposed based on analyzing the phenomenon of oil backflow. The driving waveform was composed of a shrinking stage and a driving stage. Firstly, a threshold voltage of oil splitting was calculated by analyzing the luminance curve of EWDs, which were driven by different direct current (DC) voltages. Then, an exponential function waveform, which increased from the threshold voltage, was applied to suppress oil splitting. Finally, a periodic signal combined with a reset signal with a DC signal was applied during the driving stage to maintain a stable aperture ratio display. Experimental results showed that the charge trapping effect could be effectively prevented by the proposed driving waveform. Compared with an exponential function waveform, the average luminance value was increased by 28.29%, and the grayscale stability was increased by 13.76%. Compared to a linear function waveform, the aperture ratio was increased by 10.44% and the response time was reduced by 20.27%.
电润湿显示器（EWD）是一种基于彩色油的新型类纸反射式显示器，它已逐渐成为最具潜力的电子纸之一，具有低功耗、快速响应和全彩色的特点。然而，EWD中会出现油回流现象，这使得难以维持稳定的开口率。为了提高EWD开口率的稳定性，在分析油回流现象的基础上提出了一种新的驱动波形。该驱动波形由收缩阶段和驱动阶段组成。首先，通过分析由不同直流（DC）电压驱动的EWD的亮度曲线，计算出油分裂的阈值电压。然后，施加从阈值电压开始增加的指数函数波形来抑制油分裂。最后，在驱动阶段施加与具有直流信号的复位信号相结合的周期性信号，以维持稳定的开口率显示。实验结果表明，所提出的驱动波形可以有效防止电荷俘获效应。与指数函数波形相比平均亮度值提高了28.29%，灰度稳定性提高了13.76%。与线性函数波形相比，开口率提高了10.44%，响应时间减少了20.27%。
