Patent ID: 11874460
Assignee: ENVISICS LID
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. A method for displaying a first and second picture within a viewing window, the method comprising:
outputting first spatially-modulated light of a first colour, wherein the first spatially-modulated light is spatially-modulated in accordance with a hologram of the first picture;
receiving, at an input port of a waveguide pupil expander, the first spatially-modulated light;
guiding, between a pair of parallel reflective surfaces of the waveguide pupil expander, the received light to a viewing window, wherein a first reflective surface of the pair of parallel reflective surfaces is partially transmissive to light of the first colour, wherein the transmissivity of the first surface is non-achromatic;
outputting, by the first reflective surface of the waveguide pupil expander, the received light to the viewing window to form/display the first picture;
determining a viewing position, or change in the viewing position, within the viewing window of a viewer, and
changing/recalculating the first hologram in response to a change in the determined viewing position.