Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Array projection optics. Multi-channel design for ultra slim projectors

: Sieler, M.; Schreiber, P.; Dannberg, P.; Bräuner, A.


Thienpont, H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Micro-Optics 2010 : 12.-16.4.2010, Brussels, Belgium
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7716)
ISBN: 978-0-8194-8189-4
Paper 77161A
Conferecne "Micro-Optics" <2010, Brussels>
Conference Paper
Fraunhofer IOF ()
projection display; microlens array; array projector; UV-molding; pico projector

Common projection optics use a single aperture approach to create a magnified image on a screen. The transmitted flux of such systems always scales with their system dimensions thus preventing the realization of ultra compact devices along with a high lumen output. We introduce a new multi-channel approach that breaks this rule and enables the realization of ultra slim, laterally extended projection devices with high flux and integrated homogenization. Array projection optics consists of a regular two-dimensional arrangement of projective microlenses superposing their images on the screen. First we derive the scaling laws of such a multi-channel projector in contrast to common single aperture optics and analyze the system parameters of a single projection channel by Seidel aberration theory. Based on the application of these results to a variable array size the array projection optics are specified. The technological realization of a sample system with still image projection is shown and characterized with respect to modulation transfer and flux.