An organic light-emitting device, comprising: a substrate; an organic light-emitting element on the substrate; a sealing member on the organic light-emitting element; a 1/4 wavelength layer on one surface of the substrate, the organic light-emitting element, or the sealing member; and a linear polarization layer directly formed on one surface of the substrate, the organic light-emitting element, the sealing member, or the 1/4 wavelength layer, the linear polarization layer being closer to an image display surface than the 1/4 wavelength layer wherein the linear polarization layer comprises a wire grid structure (222, 223,224) directly formed on one surface of the substrate, the organic light emitting element, the sealing member, or the 1/4 wavelength layer; wherein the wire grid structure comprises: a transparent component and a metal component each having concentration gradients in a thickness direction of the wire grid, such that the concentration of the transparent component increases closer to the image display surface and the concentration of the metal component increases further from the image display surface, or a metal layer on a low reflective layer, the low reflective layer being disposed closer to the image display surface than the metal layer, or metal having an overhang structure, wherein a surface of the metal which is closest to the image display surface is blackened. a substrate; an organic light-emitting element on the substrate; a sealing member on the organic light-emitting element; a 1/4 wavelength layer on one surface of the substrate, the organic light-emitting element, or the sealing member; and a linear polarization layer directly formed on one surface of the substrate, the organic light-emitting element, the sealing member, or the 1/4 wavelength layer, the linear polarization layer being closer to an image display surface than the 1/4 wavelength layer wherein the linear polarization layer comprises a wire grid structure (222, 223,224) directly formed on one surface of the substrate, the organic light emitting element, the sealing member, or the 1/4 wavelength layer; wherein the wire grid structure comprises: a transparent component and a metal component each having concentration gradients in a thickness direction of the wire grid, such that the concentration of the transparent component increases closer to the image display surface and the concentration of the metal component increases further from the image display surface, or a metal layer on a low reflective layer, the low reflective layer being disposed closer to the image display surface than the metal layer, or metal having an overhang structure, wherein a surface of the metal which is closest to the image display surface is blackened. a transparent component and a metal component each having concentration gradients in a thickness direction of the wire grid, such that the concentration of the transparent component increases closer to the image display surface and the concentration of the metal component increases further from the image display surface, or a metal layer on a low reflective layer, the low reflective layer being disposed closer to the image display surface than the metal layer, or metal having an overhang structure, wherein a surface of the metal which is closest to the image display surface is blackened.