3D electrohydrodynamic simulation of electrowetting displays

The fluid dynamic behavior within a pixel of an electrowetting display (EWD) is thoroughly investigated through a 3D simulation. By coupling the electrohydrodynamic (EHD) force deduced from the Maxwell stress tensor with the laminar phase field of the oil-water dual phase, the complete switch proces...

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Bibliographic Details
Published in:Journal of micromechanics and microengineering 2014-12, Vol.24 (12), p.125024
Main Authors: Hsieh, Wan-Lin, Lin, Chi-Hao, Lo, Kuo-Lung, Lee, Kuo-Chang, Cheng, Wei-Yuan, Chen, Kuo-Ching
Format: Article
Language:English
Subjects:
Computer simulation
Condensed matter: structure, mechanical and thermal properties
Contact angle
Displays
Electric potential
electrohydrodynamics
electrowetting display
Exact sciences and technology
Mathematical models
Physics
Pixels
Solid-fluid interfaces
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Three dimensional
Voltage
Wetting
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Summary:The fluid dynamic behavior within a pixel of an electrowetting display (EWD) is thoroughly investigated through a 3D simulation. By coupling the electrohydrodynamic (EHD) force deduced from the Maxwell stress tensor with the laminar phase field of the oil-water dual phase, the complete switch processes of an EWD, including the break-up and the electrowetting stages in the switch-on process (with voltage) and the oil spreading in the switch-off process (without voltage), are successfully simulated. By considering the factor of the change in the apparent contact angle at the contact line, the electro-optic performance obtained from the simulation is found to agree well with its corresponding experiment. The proposed model is used to parametrically predict the effect of interfacial (e.g. contact angle of grid) and geometric (e.g. oil thickness and pixel size) properties on the defects of an EWD, such as oil dewetting patterns, oil overflow, and oil non-recovery. With the help of the defect analysis, a highly stable EWD is both experimentally realized and numerically analyzed.
ISSN:0960-1317
1361-6439
DOI:10.1088/0960-1317/24/12/125024