An organic light-emitting display device comprising: a plurality of pixel electrodes (110R, 110G, 110B), each corresponding to one of at least a first pixel, a second pixel, and a third pixel; a pixel-defining layer covering an edge of each of the pixel electrodes (110R, 110G, 110B) and exposing a central portion of each of the pixel electrodes (110R, 110G, 110B); an intermediate layer (120R, 120G, 120B) over the pixel electrode (110R, 110G, 110B), the intermediate layer (120R, 120G, 120B) comprising an emission layer; an opposite electrode over the intermediate layer (120R, 120G, 120B); and a lens layer over the opposite electrode, the lens layer comprising a plurality of condensing lenses (410, 420) each having a circular lower surface, wherein an area of the central portion of a pixel electrode corresponding to the first pixel and exposed by the pixel-defining layer is Ar, an area of the lower surface of a condensing lens (410, 420) over the first pixel is Br, and the ratio Br/Ar ranges from 1.34 to 2.63; wherein an area of the central portion of a pixel electrode corresponding to the second pixel and exposed by the pixel-defining layer is Ag, an area of the lower surface of a condensing lens (410, 420) over the second pixel is Bg, and the ratio Bg/Ag ranges from 1.43 to 3.00; wherein an area of the central portion of a pixel electrode corresponding to the third pixel and exposed by the pixel-defining layer is Ab, an area of the lower surface of a condensing lens (410, 420) over the third pixel is Bb, and the ratio Bb/Ab ranges from 1.30 to 2.43; and characterized in that the lens layer comprises a first lens layer and a second lens layer between the first lens layer and the opposite electrode, the second lens layer having a refractive index less than the refractive index of the first lens layer. a plurality of pixel electrodes (110R, 110G, 110B), each corresponding to one of at least a first pixel, a second pixel, and a third pixel; a pixel-defining layer covering an edge of each of the pixel electrodes (110R, 110G, 110B) and exposing a central portion of each of the pixel electrodes (110R, 110G, 110B); an intermediate layer (120R, 120G, 120B) over the pixel electrode (110R, 110G, 110B), the intermediate layer (120R, 120G, 120B) comprising an emission layer; an opposite electrode over the intermediate layer (120R, 120G, 120B); and a lens layer over the opposite electrode, the lens layer comprising a plurality of condensing lenses (410, 420) each having a circular lower surface, wherein an area of the central portion of a pixel electrode corresponding to the first pixel and exposed by the pixel-defining layer is Ar, an area of the lower surface of a condensing lens (410, 420) over the first pixel is Br, and the ratio Br/Ar ranges from 1.34 to 2.63; wherein an area of the central portion of a pixel electrode corresponding to the second pixel and exposed by the pixel-defining layer is Ag, an area of the lower surface of a condensing lens (410, 420) over the second pixel is Bg, and the ratio Bg/Ag ranges from 1.43 to 3.00; wherein an area of the central portion of a pixel electrode corresponding to the third pixel and exposed by the pixel-defining layer is Ab, an area of the lower surface of a condensing lens (410, 420) over the third pixel is Bb, and the ratio Bb/Ab ranges from 1.30 to 2.43; and characterized in that the lens layer comprises a first lens layer and a second lens layer between the first lens layer and the opposite electrode, the second lens layer having a refractive index less than the refractive index of the first lens layer.