Patent ID: 11892623
Assignee: DISPELIX OY
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 0:
1. A diffractive display element for displaying an image, comprising:
a planar waveguide element,
an in-coupling region for diffractively coupling an image into the planar waveguide element,
an out-coupling region for diffractively coupling the image out of the planar waveguide element, and
an exit pupil expander (EPE) region in the planar waveguide element between the in-coupling region and out-coupling region for expanding the exit pupil of the image on the out-coupling region,
wherein:
the EPE region includes a plurality of diffractive zones arranged on a surface of the planar waveguide element and a plurality of non-diffractive zones between the diffractive zones, and
the EPE region includes at least ten different diffractive zones and at least ten different non-diffractive zones positioned such that at least one first non-diffractive zone is positioned between two diffractive zones in a first direction and at least one second non-diffractive zone is positioned between two diffractive zones in a second direction orthogonal to the first direction.