US Patent 10108011 Microsphere spaced waveguide display

The technology provides a waveguide display including an optical waveguide comprising a plurality of separated parallel optical substrates. The substrates are joined by an adhesive configured to have suspended therein a plurality of hard microspheres. The adhesive may be a pressure sensitive adhesive designed to have suspended therein the microspheres. Microspheres may have diameters on the order of a few microns up to 100 microns. The waveguide may be constructed of first and second optical substrates, and a pressure sensitive adhesive including embedded microspheres joining and spacing the substrates apart from each other. Additional substrates may be provided. The technology also provides a method of manufacturing a waveguide.