Finite-depth and vari-focal head-mounted displays based on geometrical lightguides

Miaomiao Xu, Hong Hua

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Existing waveguides and lightguides in optical see-through augmented reality (AR) displays usually guide collimated light, which results in a fixed image depth at optical infinity. In this paper, we explore the feasibility of integrating a lightguide with a varifocal optics engine to provide correct focus cues and solve the vergence-accommodation conflict in lightguide-based AR displays. The image performance and the cause of artifacts in a lightguide-based AR display with a varifocal optics engine are systematically analyzed. A non-sequential ray tracing method was developed to simulate the retinal image and quantify the effects of image focal depth on the image performance and artifacts for a vari-focal display engine of different depths. A prototype with varying image depths from 0 to 3 diopters was built and the experimental results validate the proposed system. A digital correction method is also proposed to correct the primary image artifact caused by the physical structure of the lightguide.

Original languageEnglish (US)
Pages (from-to)12121-12137
Number of pages17
JournalOptics Express
Issue number8
StatePublished - Apr 13 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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