Display structure, display device, and vehicle

A display structure, comprising:

• a waveguide;
• an in-coupling structure configured to couple a set of input beams into the waveguide as a set of in-coupled beams associated with a set of in-coupled k-vectors defining a first domain in k-space in an annular guided propagation domain associated with the waveguide;
• and
• a diffractive exit pupil expansion structure configured to receive the set of in-coupled beams and to diffract the set of in-coupled beams to form a first set of guided beams and a second set of guided beams associated with a first set of k-vectors and a second set of k-vectors, respectively, lying in the first domain and in a second domain disjoint with the first domain, respectively;
• wherein the display structure further comprises a diffractive out-coupling structure configured to receive from the exit pupil expansion structure a first diffracted set of beams and a second diffracted set of beams associated with a first diffracted set of k-vectors and a second diffracted set of k-vectors, respectively, lying in the first domain and the second domain, respectively;
• and
• the out-coupling structure is configured to couple light from the first diffracted set of beams and light from the second diffracted set of beams out of the waveguide.