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Proceedings Paper

Ultracompact eye and pupil tracking device using VCSEL arrays and position sensitive detector
Author(s): Suguru Sangu; Tatsuya Shimokawa; Shu Tanaka
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Paper Abstract

Eye tracking is one of the essential technologies for near-eye display systems, providing natural and involuntary humanmachine interfaces for application scenes of AR, VR, and MR. In this paper, novel type of an eye-tracking device is proposed, which consists of VCSEL array and PSD for realizing a triangulation system, and operates non-video based and non-mechanical. The PSD detects spatial position of a laser beam spot emitted from a certain light source and reflected from the surface of the cornea, relating to microscopic eye orientation. While, the spatially-aligned light emitters, i.e., VCSEL array, play an important role to expand detection angle of eye movement because slight change of light-incident angle on the cornea due to the difference of light-emitter positions transforms the corresponding angle into spatial information folded on a light receiving surface of the PSD. Such operations denote detections of coarse and fine movements of the eye, respectively. A notable feature of this device is that faint light from each light emitter identifies the position of laser beam spot with the help of the lock-in detection technique. The operation principle has been evaluated numerically and experimentally, and a prototype eye-tracking module with the size enough small to be mounted on glass frames has been demonstrated. These results have suggested possibility for realizing eye tracker with battery-powered driving, ultimate low processing load and data transfer amount that are our final speculation for this device.

Paper Details

Date Published: 19 February 2020
PDF: 11 pages
Proc. SPIE 11310, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR), 113101F (19 February 2020); doi: 10.1117/12.2542593
Show Author Affiliations
Suguru Sangu, Ricoh Co., Ltd. (Japan)
Tatsuya Shimokawa, Ricoh Co., Ltd. (Japan)
Shu Tanaka, Ricoh Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 11310:
Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR)
Bernard C. Kress; Christophe Peroz, Editor(s)

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