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Open AccessArticle

Photolithography Fabricated Spacer Arrays Offering Mechanical Strengthening and Oil Motion Control in Electrowetting Displays

by Yingying Dou 1,2, Lin Chen 1,2, Hui Li 3, Biao Tang 1,2,*, Alex Henzen 1,2 and Guofu Zhou 1,2,4,5,*
1
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
2
National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
3
College of Mechatronics and Control Engineering, Shenzhen University, Nanhai Ave 3688, Shenzhen 518060, China
4
Shenzhen Guohua Optoelectronics Tech. Co. Ltd., Shenzhen 518110, China
5
Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, China
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(2), 494; https://doi.org/10.3390/s20020494
Received: 5 December 2019 / Revised: 8 January 2020 / Accepted: 14 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Lab-on-a-Chip Technology)
Introducing spacers into pixelated electrowetting displays (EWDs) normally gives mechanical strengthening, while bringing undesired disturbance of water/oil interfacial dynamics. Hence, spacer array is a key pixel structure needs careful consideration in the design and fabrication of electrowetting displays. Here, we propose a spacer array, which is designed standing on the junction of adjacent pixel walls, fabricated by photolithography. The spacer array provides mechanical strength enhancement and reliable oil motion controllability. By optimizing the spacer distribution density, the EWD device may achieve 28% increase in open ratio (white area fraction) and withstand 60 N/mm2 pressure. This design of spacer array reasonably solves the contradiction between mechanical strength enhancement and optoelectronic performance in EWDs, providing potential applications in oil–water two-phase microfluidic devices. View Full-Text
Keywords: electrowetting display; oil motion; spacer arrays; mechanical strength; optoelectronic performance electrowetting display; oil motion; spacer arrays; mechanical strength; optoelectronic performance
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MDPI and ACS Style

Dou, Y.; Chen, L.; Li, H.; Tang, B.; Henzen, A.; Zhou, G. Photolithography Fabricated Spacer Arrays Offering Mechanical Strengthening and Oil Motion Control in Electrowetting Displays. Sensors 2020, 20, 494.

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