Yang Guisong, Zhuang Lei, Bai Pengfei, Tang Biao, Henzen Alex, Zhou Guofu
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, P. R. China.
National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China.
ACS Omega. 2020 Mar 3;5(10):5326-5333. doi: 10.1021/acsomega.9b04352. eCollection 2020 Mar 17.
Electrowetting has drawn significant interest because of the potential applications of displays, lab-on-a-chip microfluidic devices, electro-optical switches, and so forth. However, electrowetting display (EWD) is monostable, which needs extra continuous voltage supply to keep contracting the oil. This paper is concerned with the simulation of two-phase liquid flow in three-dimensional EWD pixels with two electrodes (E1 and E2) demonstrating bistability, where power is only needed to move the oil droplet between two stable states. The effects of E1 geometry, E2 geometry, and E2 pulse characteristics on the dynamics of the oil droplet motion have been analyzed. Also, predictions of the transient states in four stages of the reversible bistable operation process have been carried out by employing the finite element method, in qualitative agreement with our experimental results of the monostable EWD and the existing literature. We seek to shed more light on the fundamental two-phase liquid flow in three-dimensional pixels exhibiting bistability for low power EWD and guide optimizing the electrodes to the perfect patterns with the aid of rigorous modeling.
由于在显示器、芯片实验室微流控设备、电光开关等方面的潜在应用，电润湿已引起了广泛关注。然而，电润湿显示器（EWD）是单稳态的，需要额外的连续电压供应来保持油滴收缩。本文关注的是在具有两个电极（E1和E2）的三维EWD像素中两相液体流动的模拟，该模拟展示了双稳态，其中仅需功率就能使油滴在两个稳定状态之间移动。分析了E1几何形状、E2几何形状和E2脉冲特性对油滴运动动力学的影响。此外，通过采用有限元方法对可逆双稳态操作过程四个阶段的瞬态进行了预测，与我们单稳态EWD的实验结果和现有文献在定性上一致。我们试图更深入地了解在低功耗EWD中呈现双稳态的三维像素中的基本两相液体流动，并借助严格建模指导将电极优化到完美图案。
