A display panel comprising: a base substrate which includes a front surface and a rear surface and in which a first hole and a second hole are defined, wherein a display area is defined in the front surface, wherein the first hole overlaps with the display area and penetrates the front surface and the rear surface, and wherein the second hole overlaps with the display area, is adjacent to the first hole, and is recessed from the front surface; and a pixel layer on the base substrate , wherein the base substrate comprises: a first base layer including the rear surface of the base substrate ; a first barrier layer on the first base layer ; a second base layer on the first barrier layer ; and a second barrier layer on the second base layer and including the front surface of the base substrate , wherein the second hole is defined in the second base layer and the second barrier layer , characterised in that the first barrier layer comprises a plurality of first inorganic films having a first refractive index and a plurality of second inorganic films having a second refractive index, wherein the first inorganic films and the second inorganic films are alternately stacked and wherein the first refractive index is different from the second refractive index. a base substrate which includes a front surface and a rear surface and in which a first hole and a second hole are defined, wherein a display area is defined in the front surface, wherein the first hole overlaps with the display area and penetrates the front surface and the rear surface, and wherein the second hole overlaps with the display area, is adjacent to the first hole, and is recessed from the front surface; and a pixel layer on the base substrate , wherein the base substrate comprises: a first base layer including the rear surface of the base substrate ; a first barrier layer on the first base layer ; a second base layer on the first barrier layer ; and a second barrier layer on the second base layer and including the front surface of the base substrate , wherein the second hole is defined in the second base layer and the second barrier layer , characterised in that the first barrier layer comprises a plurality of first inorganic films having a first refractive index and a plurality of second inorganic films having a second refractive index, wherein the first inorganic films and the second inorganic films are alternately stacked and wherein the first refractive index is different from the second refractive index. a first base layer including the rear surface of the base substrate ; a first barrier layer on the first base layer ; a second base layer on the first barrier layer ; and a second barrier layer on the second base layer and including the front surface of the base substrate , wherein the second hole is defined in the second base layer and the second barrier layer , characterised in that the first barrier layer comprises a plurality of first inorganic films having a first refractive index and a plurality of second inorganic films having a second refractive index, wherein the first inorganic films and the second inorganic films are alternately stacked and wherein the first refractive index is different from the second refractive index. <EOS>