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Applied Physics Letters / Volume 97 / Issue 14 / DEVICE PHYSICS

Appl. Phys. Lett. 97, 143501 (2010); http://dx.doi.org/10.1063/1.3494552 (3 pages)

High reflectivity electrofluidic pixels with zero-power grayscale operation

S. Yang1, K. Zhou2, E. Kreit1, and J. Heikenfeld1

1Novel Devices Laboratory, School of Electronics and Computing Systems, University of Cincinnati, Cincinnati, Ohio 45221, USA
2Gamma Dynamics, Cincinnati, Ohio 45221, USA

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(Received 19 May 2010; accepted 16 July 2010; published online 4 October 2010)

Electrofluidic display pixels are demonstrated with zero-power grayscale operation for 3 months and with >70% reflectance. The color of the pixel is changed as electrowetting moves the pigment dispersion between a top and bottom channel. When voltage is removed, a near zero Laplace pressure and a hysteresis pressure of 0.11 kN/m2 stabilizes the position. For 450 μm pixels, an electromechanical pressure of 1.4 kN/m2 moves the pigment dispersion at a speed of ∼ 2650 μm/s. The predicted switching speed for ∼ 150 μm pixels is consistent with video rate operation (20 ms). The geometrically sophisticated pixel structure is fabricated with only simple photolithography and wet chemical processing.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

electromechanical effects, electrophoretic displays, photolithography, reflectivity, wetting

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3494552

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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