A display device comprising: a substrate including a display area and a non-display area; and a plurality of pixels including a first pixel, a second pixel adjacent to the first pixel in a column direction, and a third pixel adjacent to the second pixel in the column direction, provided on the display area, wherein the first pixel comprises a 1_1th sub-pixel, a 2-1th sub-pixel and a 3_1th sub-pixel in a row direction, the second pixel comprises a 1_2th sub-pixel, a 2_2th sub-pixel and a 3_2th sub-pixel in the row direction, and the third pixel comprises 1_3th sub-pixel, a 2_3th sub-pixel and a 3_3th sub-pixel in the row direction, wherein each sub-pixel includes an emission area and a non-emission area, wherein each of the sub-pixels comprises a display element layer including at least one light emitting element that emits light, the display element layer comprises: a first electrode (EL1_1) and a second electrode spaced apart from each other with the light emitting element being disposed between the first and second electrodes; and a connection line comprising a first connection line extending in a row direction of the substrate and connected to the first electrode, and a second connection line extending parallel the first connection line and connected to the second electrode, wherein a first sub-pixel boundary area is a non-display area between the emission area of the 1_1th sub-pixel and the emission area of the 1_2th sub-pixel, and a second sub-pixel boundary area is a non-display area between the emission area of the 1_2th sub-pixel and the emission area of the 1_3th sub-pixel, characterised in that the first connection line of the 1_1th sub-pixel and the first connection line of the 1_2th sub-pixel are disposed in the first sub-pixel boundary area to form a mirror symmetric structure with respect to an imaginary line extending in the row direction, and the second connection line of the 1_2 sub-pixel and the second connection line of the 1_3th sub-pixel are disposed in the second sub-pixel boundary area to form a mirror symmetric structure with respect to an imaginary line extending in the row direction. a substrate including a display area and a non-display area; and a plurality of pixels including a first pixel, a second pixel adjacent to the first pixel in a column direction, and a third pixel adjacent to the second pixel in the column direction, provided on the display area, wherein the first pixel comprises a 1_1th sub-pixel, a 2-1th sub-pixel and a 3_1th sub-pixel in a row direction, the second pixel comprises a 1_2th sub-pixel, a 2_2th sub-pixel and a 3_2th sub-pixel in the row direction, and the third pixel comprises 1_3th sub-pixel, a 2_3th sub-pixel and a 3_3th sub-pixel in the row direction, wherein each sub-pixel includes an emission area and a non-emission area, wherein each of the sub-pixels comprises a display element layer including at least one light emitting element that emits light, the display element layer comprises: a first electrode (EL1_1) and a second electrode spaced apart from each other with the light emitting element being disposed between the first and second electrodes; and a connection line comprising a first connection line extending in a row direction of the substrate and connected to the first electrode, and a second connection line extending parallel the first connection line and connected to the second electrode, a first electrode (EL1_1) and a second electrode spaced apart from each other with the light emitting element being disposed between the first and second electrodes; and a connection line comprising a first connection line extending in a row direction of the substrate and connected to the first electrode, and a second connection line extending parallel the first connection line and connected to the second electrode, wherein a first sub-pixel boundary area is a non-display area between the emission area of the 1_1th sub-pixel and the emission area of the 1_2th sub-pixel, and a second sub-pixel boundary area is a non-display area between the emission area of the 1_2th sub-pixel and the emission area of the 1_3th sub-pixel, characterised in that the first connection line of the 1_1th sub-pixel and the first connection line of the 1_2th sub-pixel are disposed in the first sub-pixel boundary area to form a mirror symmetric structure with respect to an imaginary line extending in the row direction, and the second connection line of the 1_2 sub-pixel and the second connection line of the 1_3th sub-pixel are disposed in the second sub-pixel boundary area to form a mirror symmetric structure with respect to an imaginary line extending in the row direction.