Patent ID: 11947117
Assignee: META PLATFORMS TECHNOLOGIES, LLC
Field: Optics (Instruments)
Classification: CPC G  H | IPC F  G  H

Claim 0:
1. A waveguide display comprising:
a waveguide transparent to visible light;
a first reflection volume Bragg grating (VBG) on the waveguide and characterized by a first refractive index modulation; and
a second reflection VBG on the waveguide and including a plurality of regions characterized by different respective refractive index modulations,
wherein the first reflection VBG is configured to diffract display light in a first wavelength range and a first field of view (FOV) range such that the display light in the first wavelength range and the first FOV range propagates in the waveguide through total internal reflection to the plurality of regions of the second reflection VBG;
wherein the plurality of regions of the second reflection VBG are configured to diffract the display light in different respective wavelength ranges within the first wavelength range and the first FOV range;
wherein the plurality of regions of the second reflection VBG are configured such that the display light in the first wavelength range and the first FOV range reaches a first region of the plurality of regions having a second refractive index modulation before reaching a second region of the plurality of regions having a third refractive index modulation that is greater than the second refractive index modulation; and
wherein the first region is configured to diffract the display light in a first wavelength sub-range of the first wavelength range, the second region is configured to diffract the display light in a second wavelength sub-range of the first wavelength range, and the second wavelength sub-range includes the first wavelength sub-range and is wider than the first wavelength sub-range.