Multi-depth augmented reality display

An imaging system for generating multi-depth virtual images on a display screen, the imaging system comprising:

• an image realisation device for forming a source image;
• and
• projection optics for rendering a display image on the display screen, wherein the display image is a virtual image corresponding to the source image, the projection optics having an optical axis, and
• wherein the image realisation device comprises:
• a first image realisation surface at a first distance along the optical axis from the focal point of the projection optics,
• a second image realisation surface at a second different distance along the optical axis from the focal point of the projection optics,
• wherein the first and second image realisation surfaces overlap at least in part, and
• wherein each of the first and second image realisation surface comprise a plurality of regions, each region being selectively switchable between a transparent state and an image realisation state such that the source image may be selectively formed on a region of the first or second image realisation surface and projected through the projection optics rendering the display image on the display screen at a first or second apparent depth, and wherein an extent of each of the plurality of regions of the first and second image realisation surface is variable.