Large-scale preparation of size-controlled Fe3O4@SiO2 particles for electrophoretic display with non-iridescent structural colors

Wang, Wei; Zheng, Ang; Jiang, Yifan; Lan, Dongsheng; Lu, Fenghua; Zheng, Lelin; Zhuang, Lin; Hong, Rui

doi:10.1039/c8ra08352e

Cited by 22 publications

(13 citation statements)

References 44 publications

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“…Its structure is shown in Figure 1. It is mainly composed of a common electrode plate, a pixel electrode plate, black particles, white particles, red particles, and non-polar solvents [26]. These three kinds of particles have different kinds of charges, and they are encapsulated in microcapsules.…”

Section: Principle Of Three-color Epdsmentioning

confidence: 99%

Design of Driving Waveform for Shortening Red Particles Response Time in Three-Color Electrophoretic Displays

Zeng

Zhou

et al. 2021

Micromachines

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Three-color electrophoretic displays (EPDs) have the advantages of multi-color display and low power consumption. However, their red particles have the disadvantage of long response time. In this paper, a driving waveform, which is based on electrophoresis theory and reference gray scale optimization, was proposed to shorten the response time of red particles in three-color EPDs. The driving waveform was composed of erasing stage, reference gray scale forming stage, red driving stage, and white or black driving stage. Firstly, the characteristics of particle motion were analyzed by electrophoresis theory and Stokes law. Secondly, the reference gray scale of the driving waveform was optimized to shorten the distance between red particles and a common electrode plate. Finally, an experimental platform was developed to test the performance of the driving waveform. Experimental results showed that the proposed driving waveform can shorten the response time of red particles by 65.57% and reduce the number of flickers by 66.67% compared with the traditional driving waveform.

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Section: Principle Of Three-color Epdsmentioning

confidence: 99%

Design of Driving Waveform for Shortening Red Particles Response Time in Three-Color Electrophoretic Displays

Zeng

Zhou

et al. 2021

Micromachines

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show abstract

“…A grayscale conversion path algorithm was proposed to reduce driving distance [ 23 ], which provided a reference value for increasing red saturation. In addition, the performance of EPDs could also be improved by new composite materials [ 24 , 25 ], a blue nanocomposite coated with an ionic liquid polymer was proposed to promote particle motion [ 26 ], and the influence of dispersion medium on particles motion has also been studied [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Red Display for Three-Color Electrophoretic Displays with High Saturation via a Separation Stage between Black and Red Particles

et al. 2022

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A three-color electrophoretic display (EPD) can solve the defect of an insufficient color display of black/white EPDs, but it is difficult to achieve a high red saturation due to the same driving polarity between black and red electrophoretic particles. In this work, a separation stage was proposed in the driving process to increase the red saturation in three-color EPDs. Firstly, red particles’ motion was analyzed by the electrophoretic theory and Stokes’ theorem to optimize driving parameters. Secondly, the activity of black particles was analyzed by testing different driving process parameters, and an optimal activation parameter for red particles was obtained. Next, the separation stage parameters were analyzed to reduce the mixing degree of black and red electrophoretic particles. Experimental results showed that the red and black electrophoretic particles could be effectively separated. Compared with an existing driving method, the red saturation was increased by 23.4%.

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“…The display quality of EPDs has obviously improved by synthetizing new material, manufacturing new devices, and optimizing the driving waveform, etc. [ 18 , 19 , 20 ]. As optimizing the driving waveform has an obvious improvement in the display quality, researchers have done many works in this aspect.…”

Section: Introductionmentioning

confidence: 99%

Design of Driving Waveform Based on a Damping Oscillation for Optimizing Red Saturation in Three-Color Electrophoretic Displays

Zeng

et al. 2021

Micromachines

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At present, three-color electrophoretic displays (EPDs) have problems of dim brightness and insufficient color saturation. In this paper, a driving waveform based on a damping oscillation was proposed to optimize the red saturation in three-color EPDs. The optimized driving waveform was composed of an erasing stage, a particles activation stage, a red electrophoretic particles purification stage, and a red display stage. The driving duration was set to 360 ms, 880 ms, 400 ms, and 2400 ms, respectively. The erasing stage was used to erase the current pixel state and refresh to a black state. The particles’ activation stage was set as two cycles, and then refreshed to the black state. The red electrophoretic particles’ purification stage was a damping oscillation driving waveform. The red and black electrophoretic particles were separated by changing the magnitude and polarity of applied electric filed, so that the red electrophoretic particles were purified. The red display stage was a low positive voltage, and red electrophoretic particles were driven to the common electrode to display a red state. The experimental results showed that the maximum red saturation could reach 0.583, which was increased by 27.57% compared with the traditional driving waveform.

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Large-scale preparation of size-controlled Fe₃O₄@SiO₂ particles for electrophoretic display with non-iridescent structural colors

Abstract: Fe3O4@SiO2 particles were prepared on the gram-scale by selecting Na3Cit as the modifier with binary solvent and were assembled into colloidal amorphous arrays with unique and attractive optical properties for EPD.

Cited by 22 publications

References 44 publications

Design of Driving Waveform for Shortening Red Particles Response Time in Three-Color Electrophoretic Displays

Design of Driving Waveform for Shortening Red Particles Response Time in Three-Color Electrophoretic Displays

Red Display for Three-Color Electrophoretic Displays with High Saturation via a Separation Stage between Black and Red Particles

Design of Driving Waveform Based on a Damping Oscillation for Optimizing Red Saturation in Three-Color Electrophoretic Displays

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