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Proceedings Paper

Recent advancements in system design for miniaturized MEMS-based laser projectors
Author(s): M. Scholles; K. Frommhagen; Ch. Gerwig; J. Knobbe; H. Lakner; D. Schlebusch; M. Schwarzenberg; U. Vogel
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Paper Abstract

Laser projection systems that use the flying spot principle and which are based on a single MEMS micro scanning mirrors are a very promising way to build ultra-compact projectors that may fit into mobile devices. First demonstrators that show the feasibility of this approach and the applicability of the micro scanning mirror developed by Fraunhofer IPMS for these systems have already been presented. However, a number of items still have to be resolved until miniaturized laser projectors are ready for the market. This contribution describes progress on several different items, each of them of major importance for laser projection systems. First of all, the overall performance of the system has been increased from VGA resolution to SVGA (800×600 pixels) with easy connection to a PC via DVI interface or by using the projector as embedded system with direct camera interface. Secondly, the degree of integration of the electronics has been enhanced by design of an application specific analog front end IC for the micro scanning mirror. It has been fabricated in a special high voltage technology and does not only allow to generate driving signals for the scanning mirror with amplitudes of up to 200V but also integrates position detection of the mirror by several methods. Thirdly, first results concerning Speckle reduction have been achieved, which is necessary for generation of images with high quality. Other aspects include laser modulation and solutions regarding projection on tilted screens which is possible because of the unlimited depth of focus.

Paper Details

Date Published: 29 January 2008
PDF: 12 pages
Proc. SPIE 6911, Emerging Liquid Crystal Technologies III, 69110U (29 January 2008); doi: 10.1117/12.762679
Show Author Affiliations
M. Scholles, Fraunhofer Institute for Photonic Microsystems (Germany)
K. Frommhagen, Fraunhofer Institute for Photonic Microsystems (Germany)
Ch. Gerwig, Fraunhofer Institute for Photonic Microsystems (Germany)
J. Knobbe, Fraunhofer Institute for Photonic Microsystems (Germany)
H. Lakner, Fraunhofer Institute for Photonic Microsystems (Germany)
D. Schlebusch, Fraunhofer Institute for Photonic Microsystems (Germany)
M. Schwarzenberg, Fraunhofer Institute for Photonic Microsystems (Germany)
U. Vogel, Fraunhofer Institute for Photonic Microsystems (Germany)

Published in SPIE Proceedings Vol. 6911:
Emerging Liquid Crystal Technologies III
Liang-Chy Chien, Editor(s)

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