Large-view-field high-brightness holographic waveguide system based on multi-layer volume grating and preparation method of large-view-field high-brightness holographic waveguide system

The invention discloses a large-view-field high-brightness holographic waveguide system based on a multilayer volume grating and a preparation method, the system comprises a micro image source (1), a collimation system (2) and a waveguide unit, and the waveguide unit comprises a multilayer waveguide medium (3) and a grating composite structure; the grating in the composite structure comprises an in-coupling grating and an out-coupling grating which are respectively positioned on the same side of the multi-layer waveguide medium and have a certain distance; the collimation system and the micro image source are arranged on the same side of the waveguide unit; two layers of waveguide media in the multiple layers of waveguide media are supported by a spacer (4); incident angles in different view fields are diffracted in a cascade connection mode of composite structures composed of waveguide media and gratings, the composite structures are mutually independent, the incident angles in a certain range are diffracted