Patent ID: 11885967
Assignee: META PLATFORMS TECHNOLOGIES, LLC
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 15:
16. A waveguide display comprising:
a first substrate;
a second substrate;
an input grating coupler between the first substrate and the second substrate and configured to couple display light into the first substrate or the second substrate via reflective diffraction that more preferentially reflectively diffracts incident light of a first polarization state over incident light of a second polarization state that is orthogonal to the first polarization state;
an output grating coupler between the first substrate and the second substrate and configured to at least partially couple the display light out of the waveguide display towards an eyebox of the waveguide display via reflective diffraction that more preferentially reflectively diffracts incident light of the first polarization state over incident light of the second polarization state; and
a phase structure on the first substrate or the second substrate and configured to change a polarization state of the display light coupled into the first substrate or the second substrate before the display light coupled into the first substrate or the second substrate reaches the output grating coupler such that the display light incident on the output grating coupler is predominantly in the first polarization state than the second polarization state with respect to the output grating coupler.