Optical apparatus, module and device

An apparatus, comprising:

• a first light guiding means comprising at least a first in-coupling diffraction means configured to in-couple one or more first beams of light into the first light guiding means from a first light engine, a first expanding means configured to expand the one or more first beams of light along a horizontal direction, and a first out-coupling diffraction means positioned within the first light guiding means so that the one or more expanded first beams of light are provided from the first expanding means in the first light guiding means to the first out-coupling diffraction means in the first light guiding means that is configured to out-couple the one or more expanded first beams of light from the first light guiding means along a vertical direction, the first expanding means for the first light guiding means having a smaller side nearer the first in-coupling diffraction means for the first light guiding means and a start of a side of the first out-coupling diffraction means for the first light guiding means, and a larger side toward an end of the side of the first out-coupling diffraction means for the first light guiding means;
• and
• a second light guiding means comprising at least a second in-coupling diffraction means configured to in-couple one or more second beams of light into the second light guiding means from a second light engine, a second expanding means configured to expand the one or more second beams of light along the horizontal direction, and a second out-coupling diffraction means positioned within the second light guiding means so that the one or more expanded second beams of light are provided from the second expanding means in the second light guiding means to the second out-coupling diffraction means in the second light guiding means that is configured to out-couple the one or more expanded second beams of light from the second light guiding means along the vertical direction, the second expanding means for the second light guiding means having a smaller side nearer the second in-coupling diffraction means for the second light guiding means and a start of a side of the second out-coupling diffraction means for the second light guiding means, and a larger side toward an end of the side of the second out-coupling diffraction means for the second light guiding means;
• wherein the apparatus is configured so that the first out-coupling diffraction means of the first light guiding means at least partially overlaps the second out-coupling diffraction means of the second light guiding means so that an image provided by the second light guiding means overlays an image provided by the first light guiding means to control at least brightness of one or more images provided by the apparatus;
• and
• wherein the first and second in-coupling diffraction means and corresponding first and second light expanding diffraction means are on opposite sides of the apparatus based on the vertical direction, and wherein the first and second in-coupling diffraction means are on opposite sides of the apparatus based on the horizontal direction.