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    Digitally switchable multi-focal element for wearable displays

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    Author
    Hua, Hong
    Wang, Xuan
    Affiliation
    Univ Arizona, 3D Visualizat & Imaging Syst Lab, Coll Opt Sci
    Issue Date
    2019-02-27
    Keywords
    Multi-focal
    switchable element
    freeform optics
    
    Metadata
    Show full item record
    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Xuan Wang and Hong Hua "Digitally switchable multi-focal element for wearable displays", Proc. SPIE 11040, Optical Design Challenge 2019, 1104008 (27 February 2019); https://doi.org/10.1117/12.2522820
    Journal
    OPTICAL DESIGN CHALLENGE 2019
    Rights
    © 2019 SPIE
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    An innovative concept is proposed for an optical element which offers the capability of rapidly switching the optical power of the system among multiple foci. The switchable multifocal element consists of a custom-designed freeform lens offering multiple discrete foci and a programmable high-speed liquid crystal shutter (LCS). The freeform lens is divided into patterned zones, through which multiple distinct foci are produced. The LCS consists of patterned zones corresponding to those zones of the freeform lens, which can be programmably switched on and off. By combining the multi-focal freeform lens and the LCS in a time-multiplexed fashion, a switchable multifocal element with high-speed, large aperture and large range of tunable power was achieved. The multifocal element also meets the other requirement of an ideal tunable optical element such as low-voltage control, robustness, and compactness. A proof-of-concept two-focal head mounted display was designed to demonstrate one application of the new switchable multifocal element. The design can provide a FOV of 40 degrees and angular resolution of 1 arc minutes in visual space in an 8mm by 8mm exit pupil.
    ISSN
    0277-786X
    DOI
    10.1117/12.2522820
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2522820
    Scopus Count
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    UA Faculty Publications

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