VIRTUAL AND AUGMENTED REALITY SYSTEMS AND METHODS HAVING IMPROVED DIFFRACTIVE GRATING STRUCTURES

摘要

Disclosed is an improved diffraction structure for 3D display systems. The improved diffraction structure includes an intermediate layer that resides between a waveguide substrate and a top grating surface. The top grating surface comprises a first material that corresponds to a first refractive index value, the underlayer comprises a second material that corresponds to a second refractive index value, and the substrate comprises a third material that corresponds to a third refractive index value.

主权项

1. An augmented reality (AR) display system for delivering augmented reality content to a user, comprising:
an image-generating source to provide one or more frames of image data; a light modulator to transmit light associated with the one or more frames of image data; a diffractive optical element (DOE) to receive the light associated with the one or more frames of image data and direct the light to the user's eyes, the DOE comprising a diffraction structure having a waveguide substrate corresponding to a waveguide refractive index, a surface grating, and an underlayer disposed between the waveguide substrate and the surface grating, wherein the underlayer corresponds to an underlayer diffractive index that is different from the waveguide refractive index.