US Patent 11527740 Display device comprising stack of insulating refractive layers

Provided is a display device including a display panel including light emitting regions and a non-light emitting region adjacent to the light emitting regions, a first insulation layer disposed on the display panel, the first insulation layer having a first refractive index, and having first openings defined in a region overlapping the light emitting regions, a second insulation layer covering the display panel and the first insulation layer and having a second refractive index greater than the first refractive index of the first insulation layer, a third insulation layer disposed on the second insulation layer, the third insulation layer having the first refractive index, and having second openings defined in a region overlapping the light emitting regions, and a fourth insulation layer covering the second insulation layer and the third insulation layer and the fourth insulation layer having the second refractive index.