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优化双极复位波形以提高有源矩阵电润湿显示器中的灰度稳定性。

Optimizing Bipolar Reset Waveform to Improve Grayscale Stability in Active Matrix Electrowetting Displays.

作者信息

Zhang Taiyuan, Wang Li, Liu Linwei, Li Wei, Wu Shipeng, Guo Jianyang, Zhou Guofu

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.

School of Information Engineering, Zhongshan Polytechnic, Zhongshan 528400, China.

出版信息

Micromachines (Basel). 2024 Oct 11;15(10):1247. doi: 10.3390/mi15101247.

DOI:10.3390/mi15101247
PMID:39459121
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11509134/
Abstract

The electrowetting display (EWD) device is a new type of electrowetting-on-dielectric (EWOD) equipment that can achieve a paper-like display effect under the control of an electric field. In this microfluidic system, the stability of grayscale can be affected by various factors, such as the physicochemical properties of the materials, the device structure, and electric field distribution. To improve the grayscale stability of active matrix electrowetting displays (AM-EWDs), the impact of different polarities of driving voltage on oil backflow was investigated in this study. Based on the driving principles of AM-EWD, an optimized inter-frame bipolar reset driving waveform was designed to overcome oil backflow. The proposed driving waveform maintained the stability of the oil state by periodically and rapidly releasing trapped charges in the dielectric layer through a reverse driving voltage. Additionally, the effect of feed-through voltage on pixel driving voltage was eliminated by compensating for the driving voltage on a common electrode. Finally, the performance of the designed driving waveform was evaluated with a 6-inch AM-EWD driving platform. Compared to the conventional unipolar reset driving waveform, the backflow speed decreased by 2.70 a.u./s. The standard deviation of the display luminance was also reduced by 11.24 a.u. Experimental results indicated that both the oil backflow speed and the fluctuation range of luminance were effectively suppressed by the proposed driving waveform.

摘要

电润湿显示器（EWD）设备是一种新型的基于电介质上电润湿（EWOD）的设备，它能够在电场控制下实现类似纸张的显示效果。在这个微流体系统中，灰度的稳定性会受到多种因素的影响，比如材料的物理化学性质、设备结构以及电场分布。为了提高有源矩阵电润湿显示器（AM-EWD）的灰度稳定性，本研究考察了驱动电压的不同极性对油回流的影响。基于AM-EWD的驱动原理，设计了一种优化的帧间双极复位驱动波形来克服油回流。所提出的驱动波形通过反向驱动电压周期性地快速释放电介质层中捕获的电荷，从而保持油状态的稳定性。此外，通过补偿公共电极上的驱动电压，消除了馈通电压对像素驱动电压的影响。最后，使用一个6英寸的AM-EWD驱动平台对所设计的驱动波形的性能进行了评估。与传统的单极复位驱动波形相比，回流速度降低了2.70 a.u./s。显示亮度的标准偏差也降低了11.24 a.u.。实验结果表明，所提出的驱动波形有效地抑制了油回流速度和亮度波动范围。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/2a6af38f6b94/micromachines-15-01247-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/6c5a74248e5a/micromachines-15-01247-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/eb8a73d85a9e/micromachines-15-01247-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/099b33617987/micromachines-15-01247-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/55ff4896741f/micromachines-15-01247-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/a2748dd07749/micromachines-15-01247-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/8f08f68cdca1/micromachines-15-01247-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/04b96ed74738/micromachines-15-01247-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/129316d3840e/micromachines-15-01247-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/2a6af38f6b94/micromachines-15-01247-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/6c5a74248e5a/micromachines-15-01247-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/eb8a73d85a9e/micromachines-15-01247-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/099b33617987/micromachines-15-01247-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/55ff4896741f/micromachines-15-01247-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/a2748dd07749/micromachines-15-01247-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/8f08f68cdca1/micromachines-15-01247-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/04b96ed74738/micromachines-15-01247-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/129316d3840e/micromachines-15-01247-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/643d/11509134/2a6af38f6b94/micromachines-15-01247-g009.jpg

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