Lateral ink mobility and fringe field effects across the porous matrix of an electrophoretic display

Kelly Li Tsui; Manuel Ahumada; Mateusz Bryning; Michelle Hartono; Sang-Joon John Lee

doi:10.1117/12.2005726

1 March 2013 Lateral ink mobility and fringe field effects across the porous matrix of an electrophoretic display

Kelly Li Tsui, Manuel Ahumada, Mateusz Bryning, Michelle Hartono, Sang-Joon John Lee

Proceedings Volume 8643, Advances in Display Technologies III; 86430M (2013) https://doi.org/10.1117/12.2005726
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

This investigation studies fringe field between laterally adjacent electrodes in a reverse-emulsion electrophoretic display (REED). The display consists of a nanodroplet ink and a porous matrix that serves as the "paper" between planar electrodes. One relative advantage of this type of electronic paper display is that it can be produced with lowcost materials and manufacturing processes. A concern for image resolution, however, is the fringe field effect that occurs in the gaps between neighboring electrodes. Ideally the dye-containing nanodroplets in the ink move in a direction that is strictly perpendicular to the opposing pairs of electrodes. However, nanodroplet saturation and potential gradients from neighboring electrodes may result in lateral displacement of the nanodroplets as well. Accordingly, this study examines how fringe field between neighboring electrodes is affected by lateral spacing and applied voltage. Transient and steady-state effects were studied by fabricating and testing devices that were patterned with different lateral spacing between electrodes, and switching under different voltage levels. Relative luminance was extracted from digital microscope images, captured in the vicinity between neighboring electrodes. Measurements were recorded for electrode spacing of 20 μm, 40 μm, 60 μm, and 80 μm with devices switched at ±1.5 V and ±2.5 V. Gradients in luminance overlapped at lateral distances below 60 μm, and became distinct for left and right electrodes spaced by at least 80 μm. Higher applied voltage resulted in steeper transition between light and dark states, but exhibited distortion at electrode edges.

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Kelly Li Tsui, Manuel Ahumada, Mateusz Bryning, Michelle Hartono, and Sang-Joon John Lee "Lateral ink mobility and fringe field effects across the porous matrix of an electrophoretic display", Proc. SPIE 8643, Advances in Display Technologies III, 86430M (1 March 2013); https://doi.org/10.1117/12.2005726

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KEYWORDS

Electrodes

Glasses

Nanodroplets

Switching

Calibration

Microscopes

Distortion

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