Reexamination of Origin of Electric Charge on Migration Particles Used for Electrophoretic Displays
Abstract:Few reports have presented a comprehensive theoretical analysis of the migration mechanism in electrophoretic display. Theories for aqueous liquids are usually applied to explain the migration mechanism, although electrophoretic displays use non-aqueous liquids. As a result, there are no reasonable guidelines for choosing appropriate materials of particles or liquids for electrophoretic displays. We focus here on the roles of the few ions contained in the liquid used for electrophoretic displays; the role of the ions is essential in determining the migration mechanism in aqueous liquids. We examine the influence of ion density in non-aqueous liquids on the characteristics of electrophoretic migration, and reveal that mobility increases when the density of ions in the liquids is reduced; this result cannot be explained by the conventional theory created for aqueous liquids. Our examination also reveals that migration particles have the same polarities in the liquids as in air. Our conclusion doesn't agree with the conventional explanation of the migration mechanism of electrophoretic displays, which adopts the theory intended for aqueous liquids.
Document Type: Research Article
Publication date: January 1, 2006
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