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Open AccessArticle

Driving Waveform Design with Rising Gradient and Sawtooth Wave of Electrowetting Displays for Ultra-Low Power Consumption

by Wei Li 1,2, Li Wang 2,3,*, Taiyuan Zhang 1,2, Shufa Lai 1,2, Linwei Liu 1,2, Wenyao He 1,2, Guofu Zhou 1,2,3 and Zichuan Yi 2,4
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
Shenzhen Guohua Optoelectronics Tech. Co., Ltd., Shenzhen 518110, China
3
Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, China
4
College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(2), 145; https://doi.org/10.3390/mi11020145
Received: 26 November 2019 / Revised: 19 January 2020 / Accepted: 20 January 2020 / Published: 28 January 2020
(This article belongs to the Special Issue Electrokinetics in Micro-/nanofluidic Devices)
As a kind of paper-like display technology, power consumption is a very important index for electrowetting displays (EWDs). In this paper, the influence of driving waveforms on power consumption of the EWDs is analyzed, and a driving waveform with rising gradient and sawtooth wave is designed to reduce the power consumption. There are three stages in the proposed driving waveform. In the initial stage, the driving voltage is raised linearly from the threshold to the maximum value to reduce the invalid power consumption. At the same time, the oil breakup can be prohibited. And then, a section of sawtooth wave is added for suppressing oil backflow. Finally, there is a section of resetting wave to eliminate the influence of charge leakage. Experimental results show that the power consumption of the ultra-low power driving waveform is 1.85 mW, which is about 38.13% lower than that of the conventional used square wave (2.99 mW), when the aperture ratio is 65%. View Full-Text
Keywords: driving waveform; power consumption; electrowetting display; aperture ratio; response speed driving waveform; power consumption; electrowetting display; aperture ratio; response speed
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MDPI and ACS Style

Li, W.; Wang, L.; Zhang, T.; Lai, S.; Liu, L.; He, W.; Zhou, G.; Yi, Z. Driving Waveform Design with Rising Gradient and Sawtooth Wave of Electrowetting Displays for Ultra-Low Power Consumption. Micromachines 2020, 11, 145.

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