Holographic Waveguide Displays
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EXECUTIVE CORE METHODOLOGY
Demystifying the internal optics of holographic waveguide displays that power modern augmented reality eyeglasses with geometric light paths.
Holographic waveguide displays serve as the critical optical technology that enables ultra-thin, lightweight augmented reality (AR) smart glasses. Instead of relying on bulky refractive prisms to project images into the viewer’s eye, a waveguide uses a thin piece of high-index glass as a light conduit.
The process begins with a micro-display projecting light into an input coupler—a microscopic holographic optical element (HOE) etched onto the glass. This HOE diffracts the light at a precise angle, capturing the rays within the glass plate through total internal reflection (TIR).
The trapped light bounces along the glass waveguide until it reaches an output coupler positioned in front of the viewer’s eye. This secondary holographic grating extracts the light, projecting it directly into the pupil. This allows digital graphics to merge seamlessly with the real-world field of view.