Screen printing insulator coatings for electrofluidic display devices

Chen, Xia; Jiang, Hongwei; Hayes, Robert A.; Li, Xiange; He, Tao; Zhou, Guofu

doi:10.1002/pssa.201532071

Cited by 7 publications

(7 citation statements)

References 34 publications

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“…The uniformity of the dielectric layer can be further improved by optimizing the mesh design parameters, the coating fluid properties, and the printing process. As observed previously [ 19 ], the main parameters that affect the thickness of the film are the free mesh volume and the polymer concentration in the coating solution, rather than the printing pressure and speed. We found that in terms of the “pin-hole free” property of the coating, the FP coating processed by screen printing was even better than that prepared by the traditional spin-coating method.…”

Section: Resultsmentioning

confidence: 70%

“…Some key issues that are important for the commercialization of electrofluidic arrays are simplifying the fabrication process, improving material utilization, and increasing the homogeneity of the coatings over large areas. In our previous work [ 19 , 20 ], we reported the possibility of using screen printing to simultaneously coat and pattern fluoropolymer (FP) films as insulators for EFD devices on 6 inch square substrates. This reduced the coating time from ~4 min/plate to less than 1 min/plate while increasing the material utilization from 22% to >52%.…”

Section: Introductionmentioning

confidence: 99%

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Coating and Patterning Functional Materials for Large Area Electrofluidic Arrays

Hayes

Dou

et al. 2016

Materials

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Industrialization of electrofluidic devices requires both high performance coating laminates and efficient material utilization on large area substrates. Here we show that screen printing can be effectively used to provide homogeneous pin-hole free patterned amorphous fluoropolymer dielectric layers to provide both the insulating and fluidic reversibility required for devices. Subsequently, we over-coat photoresist using slit coating on this normally extremely hydrophobic layer. In this way, we are able to pattern the photoresist by conventional lithography to provide the chemical contrast required for liquids dosing by self-assembly and highly-reversible electrofluidic switching. Materials, interfacial chemistry, and processing all contribute to the provision of the required engineered substrate properties. Coating homogeneity as characterized by metrology and device performance data are used to validate the methodology, which is well-suited for transfer to high volume production in existing LCD cell-making facilities.

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Section: Resultsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Coating and Patterning Functional Materials for Large Area Electrofluidic Arrays

Hayes

Dou

et al. 2016

Materials

Self Cite

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“… Schematic plot of electrowetting display. (Images are reproduced from reference [ 6 ] with the permission of Wiley-VCH Verlag). …”

Section: Figurementioning

confidence: 99%

“…The current preparation of dielectric layers is a lengthy and error-prone process which includes sample cleaning, film coating, surface treatment and photolithographic patterning [ 5 ]. Chen et al [ 6 ] reported the advantages of screen printing techniques for preparing uniform and compact dielectric materials as compared with the conventional spin coating process. Guo et al [ 7 ] selectively injected a fluoropolymer to form hydrophobic patterns based on a combined approach of inkjet printing and phase change filling.…”

Section: Introductionmentioning

confidence: 99%

Progress in Advanced Properties of Electrowetting Displays

Yang

Guo

et al. 2021

Micromachines

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Electrowetting display (EWD) has promising prospects in the electronic paper industry due to it having superior characteristics, such as the ability to provide a comfortable reading experience and quick response. However, in real applications, there are also problems related to dielectric deterioration, excess power consumption, optical instability and narrow color gamut etc. This paper reviewed the existing challenges and recent progress made in terms of improving the optical performance and reliability of EWD. First, the principle of electrowetting applied in small and confined configurations is introduced and the cause of the failure of the dielectric layer is analyzed. Then, the function of the pixel structures is described to avoid display defects. Next, electric signal modulations are compared in terms of achieving good image quality and optical stability. Lastly, the methods are presented for color panel realization. It was concluded that multi-layer dielectrics, three-dimensional pixel structures, proper electric frequency-and-amplitude modulation and an RGB color panel are expected to resolve the current limitations and contribute to designing advanced reflective displays.

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“…71 Recently, many researchers have demonstrated fabrication of transistors through screen printing at different scales. 72 Among the non-contact approaches, screen printing, in which screen mask is used to print materials onto large-area substrates with high throughput, is considered as one of the scalable 3D printing techniques and has been the most widely used technology in various domains such as flexible sensors, actuators, electrofluidic devices, 73 batteries, 74 and supercapacitors. 75 Chang et al demonstrated the fabrication of large area flexible pressure sensors by utilizing screen printing technique.…”

Section: Additive Manufacturing Fabrication Technologiesmentioning

confidence: 99%

Additive manufacturing as an emerging technology for fabrication of microelectromechanical systems (MEMS)

Kumar

Bhushan

Pandey

et al. 2019

Journal of Micromanufacturing

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The recent success of additive manufacturing processes (also called, 3D printing) in the manufacturing sector has led to a shift in the focus from simple prototyping to real production-grade technology. The enhanced capabilities of 3D printing processes to build intricate geometric shapes with high precision and resolution have led to their increased use in fabrication of microelectromechanical systems (MEMS). The 3D printing technology has offered tremendous flexibility to users for fabricating custom-built components. Over the past few decades, different types of 3D printing technologies have been developed. This article provides a comprehensive review of the recent developments and significant achievements in most widely used 3D printing technologies for MEMS fabrication, their working methodology, advantages, limitations, and potential applications. Furthermore, some of the emerging hybrid 3D printing technologies are discussed, and the current challenges associated with the 3D printing processes are addressed. Finally, future directions for process improvements in 3D printing techniques are presented.

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Screen printing insulator coatings for electrofluidic display devices

Cited by 7 publications

References 34 publications

Coating and Patterning Functional Materials for Large Area Electrofluidic Arrays

Coating and Patterning Functional Materials for Large Area Electrofluidic Arrays

Progress in Advanced Properties of Electrowetting Displays

Additive manufacturing as an emerging technology for fabrication of microelectromechanical systems (MEMS)

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