We report on a novel state-of-the-art diffraction optical elements (DOE) based waveguide architecture for aug- mented reality (AR) display with increased field of view and method for analytical design of such an architecture. The effectiveness of the architecture results from the multiple usage of the same propagation directions inside the waveguide by different field of view parts. Unlike in previous solutions, where such approach would lead to crosstalk generation, the proposed architecture different field of view parts are propagated in different waveguide locations, separated by the corresponding DOEs. The architecture can be applied either for increasing the verti- cal field of view size or the horizontal field of view size with compensation of chromatic dispersion resulting from the diffraction. The architecture configuration, analytical derivations of the DOEs parameters, and modeling results are discussed. The architecture satisfies market demands for the form-factor, size and weight, as well as allows up to four times increase of the field of view size in comparison with the conventional solutions. For the DOEs refractive index of 1.5, the architecture provides 48x44 degrees white-light field of view within two waveguides and 56x56 degrees white-light field of view within three waveguides. For the DOEs refractive index of 1.9, the architecture provides 58x58 degrees white-light field of view within only one waveguide.
Augmented reality (AR) systems are of huge interest for last decade since they are predicted to be the next generation of mobile devices for consumers. One of the key parameters in terms of AR systems properties is the field of view. The best performance in this regard is shown by DOE/HOE-based planar-waveguides systems since they can provide the widest field of view among other approaches even with the simplest architecture. However it is still not wide enough for consumers, so more complex architectures are created. In this work, a novel approach for reaching wide field of view is proposed. It is based on the eyebox magnification in two directions by two different waveguides systems. The first system provides magnification along the axis with wider field of view and consists of waveguides inclined along the field of view central beam with HOE-based 1D gratings, providing the TIR diffraction in both +1 and -1 orders. The TIR condition in this case is reached more easily because of inclination, so the wider angular spectrum can be transferred. The second system provides magnification along the axis with narrower field of view and consists of conventional HOE-based periscope system with in-coupling and out-coupling zones. The system working principle, HOEs specifications, main advantages, challenges and solutions are discussed. The proposed system allow 60-degrees diagonal field of view for the white (RGB) color.