Slim Diffractive BD (2025)
Slim Diffractive Waveguide Glasses for Beaming Displays with Enhanced Head Orientation Tolerance
Yuta Itoh, Tomoya Nakamura, Yuichi Hiroi, Kaan Aksit
Abstract
Augmented Reality (AR) glasses must be slim, lightweight, and energy-efficient to achieve widespread adoption. Beaming Displays present a promising solution by offloading active components, such as the power-supplied light engine, into the surrounding environ-ment while leaving only passive elements, like the eyepiece, in the wearable device. However, existing approaches still struggle to achieve both a slim design and a wide tolerance for projection angles relative to the user’s head orientation. In this work, we intro-duce a design for light-receiving glasses using a diffractive waveg-uide with in-coupling and out-coupling gratings. Our approach ex-pands the allowable range of incident angles while maintaining a compact, lightweight form factor. We developed a proof-of-concept prototype and demonstrated an incident angle tolerance of approx-imately 20-30 degrees range, overcoming the previous design of 5 degrees.