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Piezo-actuated varifocal head-mounted displays for virtual and augmented reality
Author(s): Ali Hasnain; Pierre-Yves Laffont; Shukri Bin Abdul Jalil; Kutluhan Buyukburc; Pierre-Yves Guillemet; Samuel Wirajaya; Liqiang Khoo; Teng Deng; Jean-Charles Bazin
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Paper Abstract

A fundamental cause of visual discomfort in traditional head-mounted displays (HMDs) for Virtual and Augmented Reality (VR/AR) is the vergence-accommodation conflict (VAC).We propose and develop a novel headset prototype based on the VerifocalTM platform to eliminate VAC by dynamically adjusting the focal plane of the display. The developed headset employs an eye tracking system to track the user's gaze and determine the virtual object being observed by the user. The varifocal display then moves the focal plane of the display to dynamically match the depth of the observed object, providing correct focus cues to the user. We achieve the focal plane adjustment by moving the headset's stereo displays independently using small, lightweight and low-power piezoelectric actuators. Such actuators offer a very low response time with high positional accuracy, while operating at a high speed and virtually silently. Furthermore, our headset prototype has a large adjustable dioptric range for each eye and thus provides the capability for also correcting myopia and anisometropia, allowing vision-impaired users to use the headset without the need for eyeglasses. In conclusion, our approach makes it possible for the user to observe close or far objects in the virtual environment with reduced eye strain by providing consistent depth cues for all viewing distances.

Paper Details

Date Published: 1 March 2019
PDF: 11 pages
Proc. SPIE 10942, Advances in Display Technologies IX, 1094207 (1 March 2019); doi: 10.1117/12.2509143
Show Author Affiliations
Ali Hasnain, Lemnis Technologies (Singapore)
Pierre-Yves Laffont, Lemnis Technologies (Singapore)
Shukri Bin Abdul Jalil, Lemnis Technologies (Singapore)
Kutluhan Buyukburc, Lemnis Technologies (Singapore)
Pierre-Yves Guillemet, Lemnis Technologies (Singapore)
Samuel Wirajaya, Lemnis Technologies (Singapore)
Liqiang Khoo, Lemnis Technologies (Singapore)
Teng Deng, Lemnis Technologies (Singapore)
Jean-Charles Bazin, Lemnis Technologies (Singapore)


Published in SPIE Proceedings Vol. 10942:
Advances in Display Technologies IX
Jiun-Haw Lee; Qiong-Hua Wang; Tae-Hoon Yoon, Editor(s)

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