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21 February 2008 Wafer-level vacuum packaged resonant micro-scanning mirrors for compact laser projection displays
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Abstract
Scanning laser projection using resonant actuated MEMS scanning mirrors is expected to overcome the current limitation of small display size of mobile devices like cell phones, digital cameras and PDAs. Recent progress in the development of compact modulated RGB laser sources enables to set up very small laser projection systems that become attractive not only for consumer products but also for automotive applications like head-up and dash-board displays. Within the last years continuous progress was made in increasing MEMS scanner performance. However, only little is reported on how mass-produceability of these devices and stable functionality even under harsh environmental conditions can be guaranteed. Automotive application requires stable MEMS scanner operation over a wide temperature range from -40° to +85°Celsius. Therefore, hermetic packaging of electrostatically actuated MEMS scanning mirrors becomes essential to protect the sensitive device against particle contamination and condensing moisture. This paper reports on design, fabrication and test of a resonant actuated two-dimensional micro scanning mirror that is hermetically sealed on wafer level. With resonant frequencies of 30kHz and 1kHz, an achievable Theta-D-product of 13mm.deg and low dynamic deformation <20nm RMS it targets Lissajous projection with SVGA-resolution. Inevitable reflexes at the vacuum package surface can be seperated from the projection field by permanent inclination of the micromirror.
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Ulrich Hofmann, Marten Oldsen, Hans-Joachim Quenzer, Joachim Janes, Martin Heller, Manfred Weiss, Georgios Fakas, Lars Ratzmann, Eleonora Marchetti, Francesco D'Ascoli, Massimiliano Melani, Luca Bacciarelli, Emilio Volpi, Francesco Battini, Luca Mostardini, Francesco Sechi, Marco De Marinis, and Bernd Wagner "Wafer-level vacuum packaged resonant micro-scanning mirrors for compact laser projection displays", Proc. SPIE 6887, MOEMS and Miniaturized Systems VII, 688706 (21 February 2008); https://doi.org/10.1117/12.763433
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