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13 March 2024 Shape memory alloy actuators to address vergence-accommodation conflict in XR
Nick Heijne
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Proceedings Volume PC12913, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) V; PC1291306 (2024) https://doi.org/10.1117/12.3001497
Event: SPIE AR | VR | MR, 2024, San Francisco, California, United States
Abstract
The Vergence-Accommodation Conflict (VAC) presents a well-documented and significant challenge in XR, causing visual discomfort and fatigue. It has been shown that dynamically changing the focus distance of the display enables eye’s vergence and accommodation to agree and has significant user benefits. Bringing focus adjustment to product has numerous challenges including power consumption, space constraints and added mass.

We will present how Shape Memory Alloy (SMA) can be utilised to enable dynamic focal adjustment and how CML’s SMA actuators are particularly well-suited to achieve this with low power and low added mass in a manner suited for high-volume manufacture.
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Nick Heijne "Shape memory alloy actuators to address vergence-accommodation conflict in XR", Proc. SPIE PC12913, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) V, PC1291306 (13 March 2024); https://doi.org/10.1117/12.3001497
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KEYWORDS
Shape memory alloys
Actuators
Power consumption
Cameras
Eye
Material fatigue
Materials properties
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