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Proceedings Paper

Holographic micro-mirror arrays as projection screens for transparent display applications
Author(s): Reinhold Fiess; Johannes Hofmann
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Paper Abstract

In the context of highly automated and autonomous driving growing market interest arises with respect to technologies enabling new use cases relying on the front, side and back windows of the car to serve as projection screens for display systems. Holographic diffusers represent a promising approach for the realization of transparent projection screens. We pursue the development of holographic diffusers composed of individual holographic micro-mirrors based on recording in our holographic wave front printer. This recording method allows for the realization of large-area holographic structures with non-conventional diffraction characteristics. We recorded a Holographic Convex Micro-Mirror Array (HCMMA) for red and green target wavelengths via spatial frequency multiplexing. We report on the fundamental properties of HCMMAs and depict the relevant recording procedure. We demonstrate the fitness of the HCMMA to serve as a transparent diffuser screen in conjunction with a LED projector and discuss potential for further improvement of our structures.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11306, Practical Holography XXXIV: Displays, Materials, and Applications, 1130606 (21 February 2020); doi: 10.1117/12.2543483
Show Author Affiliations
Reinhold Fiess, Robert Bosch GmbH (Germany)
Johannes Hofmann, Robert Bosch GmbH (Germany)
Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 11306:
Practical Holography XXXIV: Displays, Materials, and Applications
Hans I. Bjelkhagen, Editor(s)

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