Optical apparatus, optical modules, optical devices and methods

An apparatus, comprising:

• a first light waveguide comprising at least:
• a first in-coupling diffraction grating configured to in-couple one or more first input beams of light into the first light waveguide from a first light engine, a first expander configured to expand the one or more first input beams of light from the first light engine to form one or more first expanded beams of light, a first out-coupling diffraction grating configured to out-couple the one or more first expanded beams of light from the first light waveguide;
• and
• a second light waveguide comprising at least:
• a second in-coupling diffraction grating configured to in-couple one or more second input beams of light into the second light waveguide from a second light engine, a second expander configured to expand the one or more second input beams of light from the second light engine to form one or more second expanded beams of light, a second out-coupling diffraction grating configured to out-couple the one or more second expanded beams of light from the second light waveguide;
• wherein the first light waveguide is configured to provide a first image, and the second light waveguide is configured to provide a second image;
• wherein the apparatus is configured so that at least one of the first light waveguide or the second light waveguide can be moved between at least two different positions to change the relative positions of the first light waveguide and the second light waveguide;
• wherein the apparatus is configured to maintain a combined exit pupil formed from outcoupled beams from the first light waveguide and the second light waveguide as the relative positions of the first light waveguide and second light waveguide are changed;
• and
• wherein within at least a part of the combined exit pupil the image viewed is at least a part of the first image and at least a part of the second image.