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Sensors 2017, 17(5), 1112;

Photosensor-Based Latency Measurement System for Head-Mounted Displays

Department of Electronic Engineering, Sogang University, Seoul 04107, Korea
LG Display, Paju 10845, Korea
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 26 February 2017 / Revised: 8 May 2017 / Accepted: 9 May 2017 / Published: 15 May 2017
(This article belongs to the Section Physical Sensors)
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In this paper, a photosensor-based latency measurement system for head-mounted displays (HMDs) is proposed. The motion-to-photon latency is the greatest reason for motion sickness and dizziness felt by users when wearing an HMD system. Therefore, a measurement system is required to accurately measure and analyze the latency to reduce these problems. The existing measurement system does not consider the actual physical movement in humans, and its accuracy is also very low. However, the proposed system considers the physical head movement and is highly accurate. Specifically, it consists of a head position model-based rotary platform, pixel luminance change detector, and signal analysis and calculation modules. Using these modules, the proposed system can exactly measure the latency, which is the time difference between the physical movement for a user and the luminance change of an output image. In the experiment using a commercial HMD, the latency was measured to be up to 47.05 ms. In addition, the measured latency increased up to 381.17 ms when increasing the rendering workload in the HMD. View Full-Text
Keywords: head-mounted display; virtual reality; latency measurement system head-mounted display; virtual reality; latency measurement system

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Seo, M.-W.; Choi, S.-W.; Lee, S.-L.; Oh, E.-Y.; Baek, J.-S.; Kang, S.-J. Photosensor-Based Latency Measurement System for Head-Mounted Displays. Sensors 2017, 17, 1112.

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