Single-Layer Holographic Waveguide for Wide-FOV Color Uniformity

The patent segments the full-color display function into three separate monochromatic waveguide layers, each optimized for a specific wavelength (red, green, blue). Each layer contains a dedicated diffraction grating designed for its specific wavelength, allowing independent optimization of diffraction efficiency and field of view for each color channel while maintaining overall color uniformity through the stacked configuration.

The patent introduces a color separation prism as an intermediary component that spatially separates the red, green, and blue wavelength components from the image light source. This prism directs each wavelength to its corresponding dedicated waveguide layer, enabling precise wavelength-to-layer mapping and eliminating cross-contamination between color channels, thereby achieving superior color uniformity.

The patent divides the field of view requirement into three separate angular ranges, one for each wavelength (red: 30°, green: 40°, blue: 50°). Each monochromatic waveguide layer is designed to provide its specific angular range, and the stacked configuration combines these ranges to achieve the overall wide field of view. This segmentation allows each layer to be manufactured with optimized parameters for its specific wavelength without compromising the total field of view.

The patent applies local quality by designing each waveguide layer with wavelength-specific optical properties, including custom diffraction grating periods and layer thicknesses optimized for their respective wavelengths. This localized optimization ensures that each layer contributes maximally to its designated color channel's field of view while maintaining manufacturability through standardized fabrication processes for each layer type.

The patent segments the diffraction function into three separate diffraction gratings, each dedicated to a specific wavelength (red, green, blue) and located in its own monochromatic waveguide layer. This segmentation ensures that each grating operates at its optimal diffraction efficiency for its designated wavelength without interference from other wavelengths, maintaining high overall diffraction efficiency while using a relatively simple single-waveguide-per-layer structure.

The patent uses the color separation prism as an intermediary to prevent wavelength cross-contamination in the diffraction process. By spatially separating the wavelengths before they enter the waveguide layers, the prism ensures that each diffraction grating receives only its designated wavelength, eliminating ghost images and maintaining high diffraction efficiency and color purity.

The patent segments the chromatic dispersion problem by separating the three wavelengths into distinct spatial paths using the color separation prism, then directing each wavelength to its own dedicated monochromatic waveguide layer. This segmentation prevents the chromatic dispersion that would otherwise occur in a single-layer system, as each layer is optimized for its specific wavelength, thereby maintaining color uniformity while preserving the compact waveguide structure.

The color separation prism acts as an intermediary that corrects the chromatic dispersion issue by spatially separating the wavelengths before they enter the waveguide system. This intermediary component ensures that each wavelength travels through its own optimized path, eliminating the cross-talk and color distortion that would result from chromatic dispersion in a conventional diffractive waveguide, thus achieving excellent color uniformity in a compact form factor.