DISPLAY AND METHOD OF OPERATING A DISPLAY

摘要

A display includes a waveguide (12), a first holographic element for coupling display light into the waveguide (12) and a second holographic element for receiving the display light from the first holographic element and for coupling the display light out of the waveguide (12) to display the display light to a user at a viewing position (20). The first and second holographic elements can have a material structure size of substantially ≤ 20nm. The display can include a programmable spatial light modulator (44) operable selectively to cause display light to convey a desired image. The display can include a variable focus optical element to selectively vary the apparent position of an image. Methods of operating a display are also provided.