Li Wei, Liu Linwei, Zhang Taiyuan, Tian Lixia, Wang Li, Xu Cheng, Lu Jianwen, Yi Zichuan, Zhou Guofu
Shenzhen Guohua Optoelectronics Technology Co., Ltd., Shenzhen 518110, China.
Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
Micromachines (Basel). 2025 Apr 18;16(4):479. doi: 10.3390/mi16040479.
As the most promising new reflective display technology, electrowetting displays (EWDs) have the advantages of a simple structure, fast response, high contrast, and rich colors. However, due to the hysteresis effect, the grayscales of EWDs cannot be accurately controlled, which seriously restricts the industrialization process of this technology. In this paper, the oil movement process in an EWD pixel cell was simulated, and the influence of oil viscosity on the hysteresis effect was studied based on the proposed simulation model. Firstly, the cause of the hysteresis effect was analyzed through the hysteresis curve of an EWD. Then, based on the COMSOL Multiphysics simulation environment, the oil movement process in an EWD pixel cell was simulated by coupling the phase field of laminar two-phase flow and electrostatic field. Finally, based on the simulation model, the influence of oil viscosity on the hysteresis effect in an EWD pixel cell was studied. We observed that the maximum hysteresis difference in the hysteresis effect increased with the increase in oil viscosity and decreased with the decrease in oil viscosity. The oil viscosity had little effect on the maximum aperture ratio of EWD. The pixel-on response time and pixel-off response time increased with the increase in oil viscosity.
作为最具潜力的新型反射式显示技术，电润湿显示器（EWD）具有结构简单、响应速度快、对比度高和色彩丰富等优点。然而，由于滞后效应，EWD的灰度无法得到精确控制，这严重限制了该技术的产业化进程。本文对EWD像素单元中的油滴运动过程进行了模拟，并基于所提出的模拟模型研究了油的粘度对滞后效应的影响。首先，通过EWD的滞后曲线分析了滞后效应产生的原因。然后，基于COMSOL Multiphysics模拟环境，通过耦合层流两相流的相场和静电场，对EWD像素单元中的油滴运动过程进行了模拟。最后，基于该模拟模型，研究了油的粘度对EWD像素单元中滞后效应的影响。我们观察到，滞后效应中的最大滞后差异随油的粘度增加而增大，随油的粘度降低而减小。油的粘度对EWD的最大开口率影响较小。像素开启响应时间和像素关闭响应时间随油的粘度增加而增加。
