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Proceedings Paper

Vertical electrostatically 90° turning flaps for reflective MEMS display
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Paper Abstract

A new kind of MEMS reflective display is being developed having high contrast and reflectivity, better than on printed paper. The system is based on novel vertical flaps, which can be electrostatically turned by 90° to horizontal position. After fabrication, the poly-silicon flaps are vertical to the wafer surface and on the top suspended by torsion beams. In this state the pixel is black, incoming ambient light passes by the flaps and is absorbed by an underlying absorptive layer. When the flaps are turned to horizontal position light is reflected back and the pixel gets white. A self-aligning four masks bulk microfabrication process is employed, which uses poly-silicon filling of high aspect-ratio cavities. Parylene was also employed as flap material. Thanks to auto stress-compensation the flaps are not deformed due to intrinsic stresses. Low actuation voltages down to 20V can be achieved.

Paper Details

Date Published: 14 February 2011
PDF: 11 pages
Proc. SPIE 7930, MOEMS and Miniaturized Systems X, 79300H (14 February 2011); doi: 10.1117/12.873840
Show Author Affiliations
Fabio Jutzi, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Wilfried Noell, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Nico F. de Rooij, Ecole Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 7930:
MOEMS and Miniaturized Systems X
Harald Schenk; Wibool Piyawattanametha, Editor(s)

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