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Accurate measurement of virtual image distance for near-eye displays based on auto-focusing

Hao Xu, Satoshi Tabata, Haowen Liang, Lihui Wang, and Masatoshi Ishikawa

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Abstract

Virtual reality (VR) and augmented reality (AR) are able to project virtual images to human eyes at a certain depth distance. This virtual image distance can be adjusted by controlling the diopter of the near-eye display. However, it is difficult to measure accurately and continuously since this virtual image distance spans a large range. In this work, we propose a method to accurately determine the virtual image distance of commercial VR/AR equipment. The measurement apparatus is built and calibrated to validate the feasibility. The focal distance of the focus-tunable lens can be automatically adjusted via a step motor by cooperating with the image sharpness analyzing program. Compared with other proposed methods, ours provides an effective means to achieve high accuracy, a wide and continuous testing range, and automatic evaluation of virtual image distance for compact near-eye displays.

© 2022 Optica Publishing Group

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Supplementary Material (1)

NameDescription
Visualization 1       The full experimental process to measure the virtual image distance of a VR glasses.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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