IMPROVEMENTS IN OR RELATING TO WAVEGUIDES

摘要

An image-providing light source device (58) is arranged to inject a non-coherent and collimated image into waveguide element (60). Light forming the image is dispersed by an optical element (76) so as to occupy a continuum of angles within the waveguide (60). The optical element (76) and a grating (70) are arranged such that the light exiting the waveguide occupies a single angle. Thereby, pupil banding of light exiting the waveguide (60) is mitigated.