Microencapsulation of Polymer Coated Color Pigments for Multi-Color Electrophoretic Display
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Microencapsulation of Polymer Coated Color Pigments for Multi-Color Electrophoretic Display Meyoung Ju Joung, Chul Am Kim, Seong Deok Ahn, Yong Eui Lee, Seung Youl Kang, Kyung Soo Suh, and Chul Hwan Kim1 Electronics and Telecommunications Research Institute, 161 Gajeong-Dong, Yuseong-Gu Daejeon, 305-350, KOREA 1 DPI Solution, Inc., #1601, 6 Shingsung-dong, Yuseong-Gu , Daejeon, 305-345. KOREA. ABSTRACT In this study, we have investigated microencapsulation of magenta, yellow, and cyan color polymer balls with white pigment for multi-color electrophoretic display implementation. The charged color pigments have been prepared by physical coating of magenta, yellow, and cyan with functionalized polymers, then surface charging with charge control agent. These color balls with white pigment were microencapsulated in suspending fluid through in-situ polymerization. INTRODUCTION Recently, flexible and durable reflective paper-like displays with low power consumption, high contrast ratio, fast response time, thin and lightweight, and low cost has been pursued for various application such as cellular phones, PDAs, e-sigh and e-book [1-3]. Among several reflective display technologies, microcapsule-type electrophoretic display is known to be one of the most promising technology and has been actively investigated in the past few years [4-7], cause it offers ink-on-paper appearance, high reflectance, good contrast ratio, wide-viewing angle, image stability in the off state, and extremely low power consumption. The microcapsule-type electrophoretic display consists of millions of tiny microcapsules; each one containing charged particles that react to an external electric field to form an image. These particles are dispersed in a suspending fluid and then would be encapsulated into microcapsules by in-situ polymerization process microcapsules with diameters in a range of 50300 µm. In this paper we will propose color microcapsules composed of two particles, color (Magenta, Yellow, and Cyan) and white pigment potentially applicable for multi-color electrophoretic display. For example, one possible structure of color microcapsule-type electrophoretic displays is illustrated in figure 1. The electrophoretic medium comprises two different types of white and magenta pigment particles, bearing charges of opposite polarity, in a colorless suspending fluid. Optical contrast is achieved by moving charged particles separately to the opposite electrode. From the front electrode the viewer can observe white or color particles held electrostatically to the front electrode depending on the electric field and the particle charge. Recently we have reported the polymer coating of TiO2 to give electrophoretic white particles, which was proved to be essential for density matching, improving dispersion of the particles and also controlling surface charge of the pigments [8]. In this investigation we will focus on the preparation of charged white and color pigment particles by physical coating of
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TiO2 and MYC color toner pigments re
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