Display device

A display device comprising:

• a first substrate comprising a display area, a non-display area, and a plurality of pixel circuit units in the display area and the non-display area;
• a plurality of light emitting elements on the first substrate in the display area, the plurality of light emitting elements being electrically connected to the pixel circuit units;
• a hole mask layer on the first substrate and comprising a plurality of holes corresponding to the light emitting elements;
• a second substrate on the hole mask layer and comprising a plurality of open holes corresponding to the plurality of holes;
• and
• a plurality of light exit patterns in the plurality of open holes of the second substrate corresponding to the plurality of holes,
• wherein each of the light exit patterns comprises a first part in one of the plurality of open holes and a second part protruding from an upper surface of the second substrate, wherein a refractive index of each of the light exit patterns is greater than a refractive index of the second substrate.