Abstract
The use of reflective waveguides in augmented reality (AR) displays can reduce see-through transmission, such that a person facing the user can perceive an uneven brightness of the user’s face near the eye region. Uneven face brightness can cause some social and cosmetic discomfort. This disclosure describes a family of graded thin-film coats for reflective waveguides with multiple SKUs, each tailored to serve users of specific skin tone, color, and/or texture. The coating for the eye-pupil expander (EPE) and output coupler (OC) regions of the lens are tuned to achieve certain reflectance and wavelength-dependence criteria that render the prisms on the lens nearly imperceptible to bystanders and enable operation at an optimal energy efficiency. The techniques include skin-tone matching and skin-texture tuning, as well as glass-tint matching and apps to help a customer select the right thin-film grade for their skin characteristics.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Yang, Jun; Koshelev, Alexander; and Peroz, Christophe, "Custom Thin-Coat Designs for Reflective Waveguides in Augmented Reality Wearables", Technical Disclosure Commons, (July 24, 2025)
https://www.tdcommons.org/dpubs_series/8388