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Proceedings Paper

Effect of nanodroplet ink concentration on switching response of reverse-emulsion electrophoretic displays
Author(s): Winston Kuantung Wang; Remy Cromer; Michel Goedert; Maryam Mobed-Miremadi; Sang-Joon John Lee
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Paper Abstract

Reverse-emulsion electrophoretic display (REED) technology is based on an electro-responsive ink comprised of self-assembled nanodroplets dispersed in a non-polar liquid. The dye-containing nanodroplets are selectively driven toward or away from the viewing plane by patterned electrodes that define distinct pixels. In this study, experimental measurements of relative luminance were conducted to determine how ink concentration affects display performance, especially with respect to image contrast and response time. The particle size distribution of the ink was determined by dynamic light scattering and corroborated by atomic force microscopy, with average size approximately 200 nm. Concentration levels of 100%, 50%, 37.5%, 25%, 18.8%, 12.5% were tested for luminance, and the highest contrast ratio was achieved at 25%. Ink concentration was observed to have little effect on switching time, with all cases reaching steady state within approximately 2 s. Spatial variability was measured by isolating 5 mm circular zones within each tested device, and the lowest variability in relative luminance was observed for 18.8% and 25% concentration levels. The experimental observations were compared to predicted behavior based on multiphysics simulation with diluted species transport and electrostatics. The experimental test devices exhibited behavior that was similar to the saturation effects predicted by simulation, accounting for steric effects.

Paper Details

Date Published: 1 March 2013
PDF: 12 pages
Proc. SPIE 8643, Advances in Display Technologies III, 86430A (1 March 2013); doi: 10.1117/12.2005681
Show Author Affiliations
Winston Kuantung Wang, San José State Univ. (United States)
Remy Cromer, Zikon, Inc. (United States)
Michel Goedert, San José State Univ. (United States)
Maryam Mobed-Miremadi, San José State Univ. (United States)
Sang-Joon John Lee, San José State Univ. (United States)

Published in SPIE Proceedings Vol. 8643:
Advances in Display Technologies III
Liang-Chy Chien; Sin-Doo Lee; Ming Hsien Wu, Editor(s)

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