AR Content Device Optical Waveguide Superimposition

The patent divides the display system into two separate optical paths: one for the background image (real-world view through transparent lens) and one for the main image (virtual content). This segmentation allows independent optimization of each display path, achieving high-quality superimposition while managing complexity through modular design of the display module and optical member components.

The patent introduces an optical member (waveguide with grating couplers) as an intermediary component that receives light from the main image display module and guides it to superimpose on the background image viewed through the transparent lens. This intermediary enables precise control of light paths and image alignment without requiring direct integration of all components.

The patent replaces traditional mechanical optical alignment systems with photonic integrated circuit technology, specifically using grating couplers fabricated on the optical waveguide. This substitution enables precise light path control through optical diffraction principles rather than mechanical adjustment, improving precision while reducing manufacturing complexity through standardized semiconductor fabrication processes.

The patent utilizes changes in optical parameters (refractive index, grating period, coupling angle) of the waveguide structure to control light paths. By adjusting these parameters during fabrication, precise light guidance and image superimposition are achieved without complex mechanical systems, balancing precision requirements with manufacturability.

The patent employs a nested structure where the first optical panel (for main image) and second optical panel (for background image) are overlapped in a coordinated manner. The grating couplers and reflective members are positioned at specific nested locations within each panel, enabling efficient light guidance while maintaining manageable alignment tolerances through the hierarchical organization of optical elements.

The optical design incorporates self-aligning features where the grating couplers and reflective members are configured to automatically guide light paths to their intended destinations. This self-service mechanism reduces the stringency of external alignment precision requirements during manufacturing, as the optical elements inherently correct for minor misalignments through their geometric configurations.