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21 February 2020 Holographic micro-mirror arrays as projection screens for transparent display applications
Reinhold Fiess, Johannes Hofmann
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Proceedings Volume 11306, Practical Holography XXXIV: Displays, Materials, and Applications; 1130606 (2020) https://doi.org/10.1117/12.2543483
Event: SPIE OPTO, 2020, San Francisco, California, United States
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.
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Reinhold Fiess and Johannes Hofmann "Holographic micro-mirror arrays as projection screens for transparent display applications", Proc. SPIE 11306, Practical Holography XXXIV: Displays, Materials, and Applications, 1130606 (21 February 2020); https://doi.org/10.1117/12.2543483
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KEYWORDS
Holography
Wavefronts
Projection systems
Holograms
Diffraction
Displays
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