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用于灰度一致性的电润湿显示器多直流过驱动波形设计

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency.

作者信息

Xu Yijian, Li Shixiao, Wang Ziyang, Zhang Heng, Li Zikai, Xiao Bo, Guo Wei, Liu Linwei, Bai Pengfei

机构信息

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.

出版信息

Micromachines (Basel). 2023 Mar 19;14(3):684. doi: 10.3390/mi14030684.

DOI:10.3390/mi14030684
PMID:36985091
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10058742/
Abstract

Gray scale consistency in pixels was extremely important for electrowetting displays (EWDs). However, traditional electrowetting display driving waveforms could not obtain a pixel aperture ratio consistency, which led to the occurrence of gray inconsistency even if it was the same driving waveform. In addition, the oil backflow caused by charge trapping could not be sustained. Therefore, a multi-direct current (DC) overdriving waveform for gray scale consistency was proposed in this paper, which could effectively improve the performance of EWDs. The driving waveform was divided into a start-up driving phase and a stable driving phase. The stable driving phase was composed of a square wave with a duty cycle of 79% and a frequency of 43 Hz. Subsequently, an overdriving pulse was also introduced in the stable driving phase. The multi-DC driving waveform for gray scale consistency was applied to a thin film transistor-electrowetting display (TFT-EWD). The average difference between increasing driving voltage and decreasing driving voltage was only 2.79%. The proposed driving waveform has an aperture ratio of 3.7 times at low voltages compared to DC driving.

摘要

对于电润湿显示器（EWD）而言，像素中的灰度一致性极为重要。然而，传统的电润湿显示驱动波形无法实现像素开口率的一致性，即便使用相同的驱动波形，也会导致灰度不一致的情况出现。此外，电荷俘获引起的油回流无法持续。因此，本文提出了一种用于灰度一致性的多直流（DC）过驱动波形，它能够有效提升电润湿显示器的性能。该驱动波形分为启动驱动阶段和稳定驱动阶段。稳定驱动阶段由占空比为79%、频率为43Hz的方波组成。随后，在稳定驱动阶段还引入了一个过驱动脉冲。用于灰度一致性的多直流驱动波形被应用于薄膜晶体管 - 电润湿显示器（TFT - EWD）。上升驱动电压与下降驱动电压之间的平均差值仅为2.79%。与直流驱动相比，所提出的驱动波形在低电压下的开口率为其3.7倍。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b67/10058742/c3cc2195dc25/micromachines-14-00684-g018.jpg
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3
Toward Suppressing Oil Backflow Based on a Combined Driving Waveform for Electrowetting Displays.
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Micromachines (Basel). 2022 Jun 15;13(6):948. doi: 10.3390/mi13060948.
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Manipulation of a Nonconductive Droplet in an Aqueous Fluid with AC Electric Fields: Droplet Dewetting, Oscillation, and Detachment.利用交流电场对水性流体中的非导电液滴进行操控：液滴去湿、振荡与分离
Langmuir. 2021 Oct 19;37(41):12098-12111. doi: 10.1021/acs.langmuir.1c01934. Epub 2021 Sep 14.
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Design of Driving Waveform Based on a Damping Oscillation for Optimizing Red Saturation in Three-Color Electrophoretic Displays.基于阻尼振荡的驱动波形设计以优化三色电泳显示器中的红色饱和度
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