Ultracompact eye and pupil tracking device using VCSEL arrays and position sensitive detector

Suguru Sangu; Tatsuya Shimokawa; Shu Tanaka

doi:10.1117/12.2542593

19 February 2020 Ultracompact eye and pupil tracking device using VCSEL arrays and position sensitive detector

Suguru Sangu, Tatsuya Shimokawa, Shu Tanaka

Proceedings Volume 11310, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR); 113101F (2020) https://doi.org/10.1117/12.2542593
Event: SPIE AR VR MR, 2020, San Francisco, California, United States

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.

Citation Download Citation

Suguru Sangu, Tatsuya Shimokawa, and Shu Tanaka "Ultracompact eye and pupil tracking device using VCSEL arrays and position sensitive detector", Proc. SPIE 11310, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR), 113101F (19 February 2020); https://doi.org/10.1117/12.2542593

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