Enlarged mid-air image display based on slim DOE waveguide

Svetlana Danilova; Ilya Malyshev; Stanislav Shtykov; Nikolay Muravyev; Aleksandr Aspidov; Changmin Keum; Jungkweon Bae; Sunil Lee

doi:10.1117/12.2648892

14 March 2023 Enlarged mid-air image display based on slim DOE waveguide

Svetlana Danilova, Ilya Malyshev, Stanislav Shtykov, Nikolay Muravyev, Aleksandr Aspidov, Changmin Keum, Jungkweon Bae, Sunil Lee

Author Affiliations +

Proceedings Volume 12443, Advances in Display Technologies XIII; 124430L (2023) https://doi.org/10.1117/12.2648892
Event: SPIE OPTO, 2023, San Francisco, California, United States

Conference Poster

Abstract

Currently, Mid-Air Display (MAD) technology is of a great interest to practitioners. Potential application in consumer products with large aperture “floating” image displays, like TV, monitor, ATM, vending machine, home appliance, etc., and contactless user interface for remote control increase their attractiveness. In order to obtain enlarged mid-air image size at maintaining large horizontal Field of View (FoV) and high light display efficiency, the following challenges are to be solved: developing high fill-factor Diffractive Optical Elements (DOE) architecture with optimal size of out-coupling aperture and designing custom-made projection optics with specified exit pupil matched to in-coupling DOE. As a possible solution to abovementioned problems, the authors propose a MAD based on commercially available projector source, custom-made projection optics and designed corner DOE waveguide architecture with focusing Fresnel lens. The mid-air image is formed at the back focal plane of the Fresnel lens, between the viewer and the display. For mid-air image with five-inch diagonal and 32° horizontal FoV, we take waveguide out-coupling aperture of 245 x 145 mm² and Fresnel lens with back focal length of 220 mm and obtain image brightness ~1000 cd/m² due to custom projection optics. Basic contactless user interaction was also implemented.

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Svetlana Danilova, Ilya Malyshev, Stanislav Shtykov, Nikolay Muravyev, Aleksandr Aspidov, Changmin Keum, Jungkweon Bae, and Sunil Lee "Enlarged mid-air image display based on slim DOE waveguide", Proc. SPIE 12443, Advances in Display Technologies XIII, 124430L (14 March 2023); https://doi.org/10.1117/12.2648892

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