Evidence map›Paper›PMID 42567859›Full record

ArticleScientific reports2026

Charge trapping model for investigating oil backflow mechanism in electrowetting display pixels.

Taiyuan Zhang, Haorong Zhu, Linwei Liu, Wei Li, Xintong Wang, Biao Tang, Dong Yuan, Wen Zeng, Ahmad Umar, A A Ibrahim and 1 more

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PubMed Full text at PMC Publisher
In one paragraph

Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

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2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

11 authors.

Taiyuan Zhang *School of Physics and Information Engineering, Guangdong University of Education, Guangzhou, 510303, China. ztyuan668@163.com.
Haorong Zhu *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.
Linwei LiuGuangdong 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.
Wei LiGuangdong 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.
Xintong WangEpapervision Technology Guangdong Co., Ltd, Foshan, 528200, China.
Biao TangGuangdong 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.
Dong YuanGuangdong 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.
Wen ZengCollege of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China.
Ahmad UmarSTEM Pioneers Training Lab, Najran University, Najran, 11001, Kingdom of Saudi Arabia.
A A IbrahimSTEM Pioneers Training Lab, Najran University, Najran, 11001, Kingdom of Saudi Arabia.
Guofu ZhouGuangdong 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. guofu.zhou@m.scnu.edu.cn.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Electrowetting displays (EWDs) have shown great success owing to their advantages of quick response, wide color gamut, low power consumption, and high contrast. However, the presence of charge trapping effect in EWDs' hydrophobic insulating layer can give rise to phenomena such as oil backflow and contact angle saturation. The maximum aperture ratio of the pixel and the grayscale stability are limited by these phenomena. Therefore, the charge trapping behavior in a pixel was investigated. Firstly, an equivalent model of the pixel was constructed based on the principle of electrowetting-on-dielectric, and the quantitative correlation between the aperture of the pixel and the potential of trapped charges was investigated. Secondly, a method was developed to calculate the potential of trapped charges, the surface charge density in water phase, and the electrowetting force by measuring the aperture ratio of the pixel. Finally, the influence of trapped charges on the surface charge density and electrowetting force was analyzed to investigate the mechanism of oil backflow phenomenon. The experimental results indicated that the potential of trapped charges could be approximated as a linear function of the driving time during 120-second direct current (DC) driving. When a higher driving voltage was applied, the average growth rate of the potential of trapped charges was greater. As the driving voltage increased to 30 V, the average growth rate of the potential of trapped charges could reach 0.053 V/s.

Indexed as

Charge trapping effectElectrowetting displays (EWDs)Electrowetting forceOil backflow phenomenonPixel model

Identifiers

PMID42567859
PMCPMC13451350

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