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Reexamination of Origin of Electric Charge on Migration Particles Used for Electrophoretic Displays

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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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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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