Display device and method of manufacturing display device

A display device comprising:

• a display panel comprising a plurality of pixel regions;
• a first insulating layer on the display panel, comprising a first refractive index, and a plurality of first openings overlapping the plurality of pixel regions;
• a second insulating layer directly on the first insulating layer and comprising a plurality of second openings corresponding to the plurality of first openings;
• and
• a third insulating layer covering the display panel, the first insulating layer, and the second insulating layer, and comprising a second refractive index higher than the first refractive index, wherein the third insulating layer overlaps the plurality of pixel regions on a plane,
• wherein the plurality of first openings are defined by removing portions of the first insulating layer, respectively, and
• wherein the plurality of second openings are defined by removing portions of the second insulating layer, respectively.