Physical-optical analysis of lightguide coupling setup and systematic design strategy (Conference Presentation)

Roberto Knoth; Stefan Steiner; Site Zhang; Christian Hellmann; Frank Wyrowski

doi:10.1117/12.2527880

27 July 2019 Physical-optical analysis of lightguide coupling setup and systematic design strategy (Conference Presentation)

Roberto Knoth, Stefan Steiner, Site Zhang, Christian Hellmann, Frank Wyrowski

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Proceedings Volume 11062, Digital Optical Technologies 2019; 110620K (2019) https://doi.org/10.1117/12.2527880
Event: SPIE Digital Optical Technologies, 2019, Munich, Germany

Abstract

Lightguide structures are widely applied in different applications, and, nowadays, the are drawing special interest in the field of near-to-eye display systems. Such systems are typically realized with either planar or curved lightguides together with gratings for coupling light out of or into the lightguides. For the application in display, the field of view (FOV) supported by the lightguide parts becomes an important issue for the system design. In this work, we analyze the behavior of typical gratings for lightguide coupling, especially with the angular dependency taken into consideration. It will be shown that to obtain uniformity and relatively high efficiency over large FOV is a challenging task. With the evolutionary algorithm, we firstly optimize the coupling grating structure to obtain balance between uniformity and average efficiency over the desired FOV. Furthermore, by taking the image generation unit into account, we present a systematic design concept for the lightguide coupling grating. In such a manner, the constrain on the uniformity of the grating diffraction efficiency can be released to certain degree, which brings additional freedom and possibilities into the design.

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Roberto Knoth, Stefan Steiner, Site Zhang, Christian Hellmann, and Frank Wyrowski "Physical-optical analysis of lightguide coupling setup and systematic design strategy (Conference Presentation)", Proc. SPIE 11062, Digital Optical Technologies 2019, 110620K (27 July 2019); https://doi.org/10.1117/12.2527880

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KEYWORDS

Waveguides

Diffraction gratings

Optical design

Diffraction

Displays

Evolutionary algorithms

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