Display apparatus

A display apparatus comprising:

• a first micro-display configured to emit a first light beam;
• a second micro-display configured to emit a second light beam having a wavelength different from a wavelength of the first light beam;
• a light combining element comprising a light exit surface on optical paths of the first light beam and the second light beam, and the light combining element configured to receive the first light beam and the second light beam and transmit the first light beam and the second light beam through the light exit surface;
• a projection lens comprising a lens assembly and a meta optical structure, the lens assembly being configured to receive and modulate the first light beam and the second light beam exit from the light exit surface, the meta optical structure configured to control directions of the first light beam and the second light beam modulated by the lens assembly such that the first light beam and the second light beam exit from the projection lens are at different angles;
• and
• an optical waveguide configured to receive the first light beam and the second light beam exit from the projection lens, wherein the projection lens is configured to project the first light beam and the second light beam to the optical waveguide in respective directions, the respective directions are not parallel to each other.