Itoh, Y; Nakamura, T; Hiroi, Y; Aksit, K; (2024) Beaming Display Using Thin Holographic Waveguides for Wider Head Orientation Angle Range. In: Proceedings of the IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct) 2024. (pp. pp. 475-476). Institute of Electrical and Electronics Engineers (IEEE)

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Abstract

Augmented Reality (AR) glasses face fundamental challenges related to technical trade-offs. Emerging Beaming Displays (BDs) offer a compelling solution by separating the active and passive components. However, existing BD-based AR glasses have yet to achieve a thin and lightweight design with wide incident projection angles. This work proposes an eyepiece for BDs, including a holographic waveguide with tailored in- and out-coupling gratings. The proposed design aims to achieve a millimeter-thin form factor with a wide tolerance for incident angles, thus overcoming the limitations of existing designs. We have constructed proof-of-concept passive AR glasses prototypes, all approximately 2mm thick, including one in the form of conventional eyeglasses, and demonstrated an acceptable lateral angle of incidence of up to 90 degrees.

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