Achromatic doublet electrowetting prism array for beam steering device in foveated display

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A foveated display is a technology that can solve the problem of insufficient angular resolution (relative to the human eye) for near-eye display. In a high-resolution foveated display, a beam steering element is required to track the human gaze. An electrowetting prism array is a transmissive non-mechanical beam steering device, that allows a light and compact optical system to be configured and a large aperture possible. However, the view is obstructed by the sidewall of the prism array. When the size of the cell prism is 7mm, the prism array has an 87% fill-factor. To push the fill-factor to 100%, the cell prisms were magnified using a lens array. Image processing was performed such that the image produced by the lens array was identical to the original. Beam steering by refraction is accompanied by chromatic dispersion, which causes chromatic aberration, making colors appear blurry. The refractive index condition to reduce chromatic dispersion was obtained using the doublet structure of the electrowetting prism. The chromatic dispersion was reduced by 70% on average. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
Publisher
OPTICAL SOC AMER
Issue Date
2022-01
Language
English
Article Type
Article
Citation

OPTICS EXPRESS, v.30, no.2, pp.2078 - 2088

ISSN
1094-4087
DOI
10.1364/OE.448262
URI
http://hdl.handle.net/10203/292065
Appears in Collection
EE-Journal Papers(저널논문)
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