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Search Results (4)

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Keywords = electro-fluidic displays (EFDs)

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14 pages, 14070 KiB  
Article
Toward Suppressing Charge Trapping Based on a Combined Driving Waveform with an AC Reset Signal for Electro-Fluidic Displays
by Zhengxing Long, Zichuan Yi, Hu Zhang, Liming Liu and Lingling Shui
Membranes 2022, 12(11), 1072; https://doi.org/10.3390/membranes12111072 - 29 Oct 2022
Cited by 8 | Viewed by 1854
Abstract
Digital microfluidic technology based on the principle of electrowetting is developing rapidly. As an extension of this technology, electro-fluidic displays (EFDs) have gradually become a novel type of display devices, whose grayscales can be displayed by controlling oil film in pixels with a [...] Read more.
Digital microfluidic technology based on the principle of electrowetting is developing rapidly. As an extension of this technology, electro-fluidic displays (EFDs) have gradually become a novel type of display devices, whose grayscales can be displayed by controlling oil film in pixels with a microelectromechanical system (MEMS). Nevertheless, charge trapping can occur during EFDs’ driving process, which will produce the leakage current and seriously affect the performance of EFDs. Thus, an efficient driving waveform was proposed to resolve these defects in EFDs. It consisted of a driving stage and a stabilizing stage. Firstly, the response time of oil film was shortened by applying an overdriving voltage in the driving stage according to the principle of the electrowetting. Then, a direct current (DC) voltage was designed to display a target luminance by analyzing leakage current-voltage curves and a dielectric loss factor. Finally, an alternating current (AC) reset signal was applied in the stabilizing stage to suppress the charge trapping effect. The experiment results indicated that compared with a driving waveform with a reset signal and a combined driving waveform, the average luminance was improved by 3.4% and 9.7%, and the response time was reduced by 29.63% and 51.54%, respectively. Full article
(This article belongs to the Special Issue Microfluidics and MEMS Technology for Membranes II)
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11 pages, 2847 KiB  
Article
Synthesis and a Photo-Stability Study of Organic Dyes for Electro-Fluidic Display
by Yong Deng, Shi Li, Dechao Ye, Hongwei Jiang, Biao Tang and Guofu Zhou
Micromachines 2020, 11(1), 81; https://doi.org/10.3390/mi11010081 - 11 Jan 2020
Cited by 14 | Viewed by 3374
Abstract
Electro-fluidic display (EFD) is one of the most promising reflective displays because of its full color and video speed. Colored EFD oil, which normally consists of soluble organic dyes and non-polar solvent, plays a critical role in color, electro-optical behavior, and the reliability [...] Read more.
Electro-fluidic display (EFD) is one of the most promising reflective displays because of its full color and video speed. Colored EFD oil, which normally consists of soluble organic dyes and non-polar solvent, plays a critical role in color, electro-optical behavior, and the reliability of the EFD devices. In this paper, we report our research on two kinds of electro-fluidic dyes based on anthraquinone and azo pyrazolone, including their synthesis, structure characterization, and application properties. Changes of absorbance curves, color coordinates of oils, and photoelectric responses of devices were studied in detail under accelerated irradiation to investigate the photo-stability and reliability properties of synthesized oil materials and devices. Photoelectric responses and photo stability of dyes are highly varied depending on their structures. We found that 1,4-dlialkylamino anthraqinone and mono azo pyrazolone dyes are much more stable than 1,8-dlialkylamino anthraqinone and corresponding bisazo pyrazolone dyes. Full article
(This article belongs to the Special Issue Optofluidic Devices and Applications)
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10 pages, 47090 KiB  
Article
Oil Motion Control by an Extra Pinning Structure in Electro-Fluidic Display
by Yingying Dou, Biao Tang, Jan Groenewold, Fahong Li, Qiao Yue, Rui Zhou, Hui Li, Lingling Shui, Alex Henzen and Guofu Zhou
Sensors 2018, 18(4), 1114; https://doi.org/10.3390/s18041114 - 6 Apr 2018
Cited by 19 | Viewed by 5098
Abstract
Oil motion control is the key for the optical performance of electro-fluidic displays (EFD). In this paper, we introduced an extra pinning structure (EPS) into the EFD pixel to control the oil motion inside for the first time. The pinning structure canbe fabricated [...] Read more.
Oil motion control is the key for the optical performance of electro-fluidic displays (EFD). In this paper, we introduced an extra pinning structure (EPS) into the EFD pixel to control the oil motion inside for the first time. The pinning structure canbe fabricated together with the pixel wall by a one-step lithography process. The effect of the relative location of the EPS in pixels on the oil motion was studied by a series of optoelectronic measurements. EPS showed good control of oil rupture position. The properly located EPS effectively guided the oil contraction direction, significantly accelerated switching on process, and suppressed oil overflow, without declining in aperture ratio. An asymmetrically designed EPS off the diagonal is recommended. This study provides a novel and facile way for oil motion control within an EFD pixel in both direction and timescale. Full article
(This article belongs to the Special Issue Microfluidic Sensors)
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14 pages, 4907 KiB  
Article
Forming Spacers in Situ by Photolithography to Mechanically Stabilize Electrofluidic-Based Switchable Optical Elements
by Meihong Wang, Yuanyuan Guo, Robert A. Hayes, Danqing Liu, Dirk J. Broer and Guofu Zhou
Materials 2016, 9(4), 250; https://doi.org/10.3390/ma9040250 - 30 Mar 2016
Cited by 10 | Viewed by 7130
Abstract
Electro-Fluidic Displays (EFD) have been demonstrated to be an attractive technology for incorporation into portable display devices. EFDs have excellent optical efficiency and fast switching enabling video content. Ensuring mechanical stability of EFD display cells is a key challenge and essential for developing [...] Read more.
Electro-Fluidic Displays (EFD) have been demonstrated to be an attractive technology for incorporation into portable display devices. EFDs have excellent optical efficiency and fast switching enabling video content. Ensuring mechanical stability of EFD display cells is a key challenge and essential for developing large area as well as flexible displays. Although the electro-optic performance of an EFD, unlike a liquid crystal display (LCD), is insensitive to cell-gap, extreme changes in cell-gap can result in irreversible collapse of the cell. Here we use photolithography to develop spacers to prevent cell-gap collapse and provide the required mechanical stability for EFD devices. The spacer is formed directly on the cover plates (ITO/glass) after cell assembly with UV light induced phase separation polymerization in the illuminated area. Phase separation behavior between polar aqueous solution and polymer is closely related to the solubility of acrylate monomers. In this work, polyethylene glycol diacrylate (PEGDA) as cross-linker, 2-hydroxyethyl acrylate (HEA) and acrylic acid or acrylamide as co-monomers are investigated for fabricating the spacers. PEGDA was added to the mixtures in order to increase the mechanical strength of the spacer. The spacers showed excellent performance for cell-gap control in EFD devices. Full article
(This article belongs to the Special Issue Materials for Photolithography and 3D Printing)
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