Patent ID: 9465213
Filing Date: 2016-10-11
CPC Classification: G02B

Claim Text:
1. A projection display, for displaying an image to an observer, including: a first waveguide element arranged to be light transmissive; an image-providing light source device arranged to generate an image and to inject image bearing light into the first waveguide element; a first grating associated with the first waveguide element arranged to direct the image bearing light internally along the first waveguide element under total internal reflection and via which the image bearing light is outputted from the first waveguide element; a second waveguide element arranged to be light transmissive and transparent that includes a second grating arranged to receive the image bearing light from the first waveguide element and to direct the image bearing light along the second waveguide element under total internal reflection; the second waveguide element further includes a third grating arranged to diffract received image bearing light out of the second waveguide element towards an observer; and wherein an optical element associated with each waveguide element is arranged to receive and disperse a discrete point of image bearing light incident upon the optical element at a single first angle over a continuum of second angles within the respective first and second waveguide elements.