Methods and Apparatuses for Providing a Holographic Waveguide Display Using Integrated Gratings

A waveguide display, comprising:

• a source of light;
• and
• a first waveguide comprising:
• a grating structure comprising first and second gratings;
• and
• an input coupler configured to:
• couple a first field-of-view portion of light from said source of light into said first waveguide and towards said first grating;
• and
• couple a second field-of-view portion of light from said source of light into said first waveguide and towards said second grating;
• wherein:
• said first grating is configured to:
• provide beam expansion in a first direction for said first field-of-view portion of light;
• and
• provide beam expansion in said first direction and beam extraction towards a viewer for said second field-of-view portion of light;
• said second grating is configured to:
• provide beam expansion in a second direction for said second field-of-view portion of light;
• and
• provide beam expansion in said second direction and beam extraction towards a viewer for said first field-of-view portion of light;
• said input coupler, said first grating, and said second grating each comprises a grating vector;
• and
• said grating vectors of said input coupler, said first grating, and said second grating provide a resultant vector with substantially zero magnitude.