Microcapsule-based materials for electrophoretic displays
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Microcapsule-based materials for electrophoretic displays Runying Dai, Gang Wu, Peipei Yin, Hongzheng Chen * MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, & Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China ABSTRACT Electrophoretic displays, the rewritable non-light-emitting display technology based on the movement of colored pigments inside a low dielectric liquid as a voltage is applied, have attracted a great deal of academic and commercial interests due to the combination of the advantages of both electronic displays and conventional paper, including paper-like high contrast appearance, ultra-low power consumption, thinness, flexibility etc. Fabrication of electrophoretic ink by microencapsulating the electrophoretic suspension into individual microcapsules is one way to realize such application. However, there are still some limitations for its commercial application, such as the dispersion and the electrophoretic mobility of charged particles due to the nano-particles aggregation, the barrier property and stability of microcapsule wall due to the suspension releasing, etc. In this presentation, systematic studies on the preparation of electrophoretic particles and microencapsulation by complex coacervation method were carried out to solve the mentioned problems. The obtained microcapsules can be quasi-monolayer coated on ITO/PET substrate and driven by static mode to obtain a matrix character display prototype. INTRODUCTION E-book is one of the most popular electronics in modern life due to the combined advantages of traditional paper and electronic displays, including paper-like high contrast appearance, thinness, flexibility, ultra-low power consumption [1-2]. E-book is mainly based on the electrophoretic displays (EPDs) technology, where the charged particles move inside a low dielectric liquid encapsulated into individual microcapsule in an electric field to achieve the display [3-5]. Microencapsulated electrophoretic material typically consists of millions of microcapsules containing oppositely charged white particles and black particles suspended in a clear fluid [6]. However, there are still some limitations for its commercial application, such as the dispersion and the electrophoretic mobility of charged particles due to the nano-particles aggregation, the barrier property and stability of microcapsule wall due to the suspension releasing, etc. Titanium dioxide (TiO2) is commonly used as white electrophoretic particle due to its excellent whiteness. However, since TiO2 has a relatively high density of 3.9~4.1 g/cm3, which causes severe sedimentation problem in the suspended liquid. In order to improve the suspension stability of TiO2 in the suspend liquid, the density of TiO2 were reduced by preparing hollow *
Corresponding author. Tel.: +86-571-8795-2557; Fax: +86-571-8795-3733. E-mail address: [email protected] (H. Z. Chen)
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particles [3-4] and composite particles [5-10]. Meng et al. prepar
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