Drift Current Analysis of Charged Particles in a Barrier Rib-Type Electronic Paper Display
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Transactions on Electrical and Electronic Materials https://doi.org/10.1007/s42341-020-00206-y
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Drift Current Analysis of Charged Particles in a Barrier Rib‑Type Electronic Paper Display Young‑Cho Kim1 Received: 1 November 2019 / Revised: 6 May 2020 / Accepted: 30 May 2020 © The Korean Institute of Electrical and Electronic Material Engineers 2020
Abstract The drift current flowing in an electronic paper due to charged particles is analyzed. Sample panels having barrier ribs are fabricated using a photolithographic process: the cells have a rib height of 53.57 μm, a size of 220 μm × 220 μm, and a total capacitive area of 6.22 cm2. The upper and lower electrodes are fabricated with indium tin oxide and biased between − 2 and + 2 V. The electronic ink is loaded into the samples with different particle concentrations in an electrically neutralized fluid with mixing ratios of 1:0.2, 1:1, and 1:5 as a weight ratio. In the amplitudes of the current peaks, we see that the charged particles of the sample having mixing ratio of 1:0.2 have the most rapid slope with current value of 3.58 μΑ, without any interference from other neighboring particles. Particles of the sample having mixing ratio of 1:5 show the least saturation current than those of other samples. We ascertained that the point where the reflectivity change starts is not the point to which the input pulse is applied, but the maximum value of the current because of displacement current and delay time. Keywords Electronic paper · Charged particle · Drift current · Equivalent circuit · Reflectivity
1 Introduction In recent years, electrophoresis-type electronic paper displays have been successfully applied to devices such as electronic books, price tags, signboards, and credit cards. Electronic paper displays have several advantages, such as low power consumption due to the absence of a backlight or any light-emission layer, easy readability due to the reflective property of the exterior incident light, and bistability due to the memory effect based on the image force with an electrode [1, 2]. It is thought that electronic papers are more appropriate for various application areas as mentioned above than emissive-type display devices, such as liquid crystal displays or organic light-emission diodes [3, 4]. However, the demand for performance improving reflective properties, a low resolution, and a low contrast ratio remains unsatisfied, even though much progress has occurred over the last several years, including an analysis of the response time, a
* Young‑Cho Kim [email protected] 1
Department of Electronic Engineering, College of Engineering, Chungwoon University, Incheon 402‑803, Republic of Korea
color realization, finite grayscale, electrophoretic theory, and material developments [5, 6]. In addition to technological advancements, the theoretical background for aspects such as electrophoresis has recently been extended, providing a reasonable foundation for the future of electronic paper displays [7]. In particular, experiments usin
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