Grating device, screen including the grating device, method of manufacturing the screen and display apparatus for augmented reality and/or virtual reality including the screen

A grating device comprising:

• a substrate;
• and
• a diffraction grating on a surface of the substrate,
• wherein the diffraction grating comprises a plurality of meta-diffraction patterns that are separated from each other and configured to converge an incident light by diffracting the incident light, wherein each meta-diffraction pattern from among the plurality of meta-diffraction patterns has a curved shape in a direction parallel to the substrate,
• wherein the plurality of meta-diffraction patterns are not connected to each other,
• wherein the plurality of meta-diffraction patterns is transparent to p-polarized light and reflects s-polarized light,
• wherein the plurality of meta-diffraction patterns comprises a group of meta-diffraction patterns,
• wherein each meta-diffraction pattern from among the group of meta-diffraction patterns comprises a main diffraction pattern and an auxiliary diffraction pattern that protrude from the substrate and do not directly contact each other, and
• wherein the auxiliary diffraction pattern of each meta-diffraction pattern comprises a first auxiliary diffraction pattern and a second auxiliary diffraction pattern that do not directly contact each other.