Display device and head mount display device

A display device comprising:

• a substrate;
• a plurality of display elements disposed on the substrate;
• a pixel definition film including a plurality of openings which overlap the plurality of display elements;
• an encapsulation layer disposed on the plurality of display elements and the pixel definition film;
• and
• a diffraction pattern layer including a protective layer disposed on the encapsulation layer, and a plurality of holes defined in the protective layer,
• wherein a diffraction pattern of the diffraction pattern layer is defined as the protective layer on the encapsulation layer except the plurality of holes,
• wherein the diffractive pattern is disposed with a predetermined pitch, and
• wherein the diffraction pattern diffracts light emitted from the plurality of display elements in a pattern different from an arrangement pattern of the plurality of display elements, and
• wherein a number of light emission patterns of the light diffracted by the plurality of diffraction patterns is greater than a number of light emission patterns of the light emitted from the plurality of display elements.

A display device comprising:

• a substrate;
• a plurality of display elements disposed on the substrate;
• a pixel definition film including a plurality of openings which overlap the plurality of display elements;
• an encapsulation layer disposed on the plurality of display elements and the pixel definition film;
• and
• a diffraction pattern layer comprising a plurality of diffraction patterns disposed on the encapsulation layer,
• wherein the plurality of diffraction patterns diffracts light emitted from the plurality of display elements in a pattern different from an arrangement pattern of the plurality of display elements,
• wherein a number of light emission patterns of the light diffracted by the plurality of diffraction patterns is greater than a number of light emission patterns of the light emitted from the plurality of display elements, and
• wherein
• a first distance is defined as a distance between adjacent diffraction patterns in one direction, between which none of the plurality of openings is disposed, among the plurality of diffraction patterns arranged in the one direction,
• a second distance is defined as a distance between other adjacent diffraction patterns, between which one of the plurality of openings is disposed, among the plurality of diffraction patterns arranged in the one direction, and
• the first distance is smaller than the second distance.