An organic light emitting display device , comprising: a substrate ; a first protection layer disposed on the substrate ; a plurality of conductive lines (DL, PL, BE1, BE2, BE3) disposed on the first protection layer and extending substantially in a first direction (DR1); a second protection layer disposed on the conductive lines (DL, PL, BE1, BE2, BE3); a first electrode disposed on the second protection layer and overlapping at least a part of the conductive lines (DL, PL, BE1, BE2, BE3) to have an upper surface with a step difference; a pixel defining layer disposed on the second protection layer and including an opening (OP) exposing at least a part of the first electrode ; an organic light emission layer disposed on the first electrode ; and a second electrode disposed on the organic light emission layer , wherein the opening (OP) is divided on a plane into a first polygon and a second polygon with respect to an imaginary straight line (SL) that passes through the opening (OP) at a maximum length in the first direction (DR1), the opening (OP) having an asymmetric shape on the plane, wherein lengths of two opposite sides of a plurality of sides defining an edge of the opening on the plane are different from each other, wherein a planar area of the first polygon is different from a planar area of the second polygon, wherein the opening overlaps at least a part of the conductive lines, and wherein an overlap area between the first polygon and the conductive lines (DL, PL, BE1, BE2, BE3) and an overlap area between the second polygon and the conductive lines (DL, PL, BE1, BE2, BE3) have a ratio in a range from 1:0.8 to 1:1.2. a substrate ; a first protection layer disposed on the substrate ; a plurality of conductive lines (DL, PL, BE1, BE2, BE3) disposed on the first protection layer and extending substantially in a first direction (DR1); a second protection layer disposed on the conductive lines (DL, PL, BE1, BE2, BE3); a first electrode disposed on the second protection layer and overlapping at least a part of the conductive lines (DL, PL, BE1, BE2, BE3) to have an upper surface with a step difference; a pixel defining layer disposed on the second protection layer and including an opening (OP) exposing at least a part of the first electrode ; an organic light emission layer disposed on the first electrode ; and a second electrode disposed on the organic light emission layer , wherein the opening (OP) is divided on a plane into a first polygon and a second polygon with respect to an imaginary straight line (SL) that passes through the opening (OP) at a maximum length in the first direction (DR1), the opening (OP) having an asymmetric shape on the plane, wherein lengths of two opposite sides of a plurality of sides defining an edge of the opening on the plane are different from each other, wherein a planar area of the first polygon is different from a planar area of the second polygon, wherein the opening overlaps at least a part of the conductive lines, and wherein an overlap area between the first polygon and the conductive lines (DL, PL, BE1, BE2, BE3) and an overlap area between the second polygon and the conductive lines (DL, PL, BE1, BE2, BE3) have a ratio in a range from 1:0.8 to 1:1.2. <EOS>