An organic light emitting device that improves contrast by forming a gate wiring and a data wiring of a black matrix with a concentration gradient between a conductive material of high transmittance and a conductive material of high reflectivity. The organic light emitting device according to the present invention comprises a gate wiring and a data wiring formed on an insulating substrate, a pixel portion formed by the gate wiring and the data wiring, and a pixel arranged in the pixel portion, wherein at least one of the gate wiring and the data wiring is formed of a conductive light-absorbing material. At least one of the wirings is formed of a light-absorbing material with the concentration gradient between the conductive material of the high transmittance and the conductive material of the high reflectivity. The conductive material of the high reflectivity is composed of at least one of Al, Mo, Ti, Cu, Ag, or similar material, and the conductive material with high transmittance is composed of at least one of ITO, IO, TO, IZO, ZnO or similar material. The gate wiring includes a gate line, a gate electrode of a thin film transistor, a capacitor electrode, or a power line, and the data wiring includes a data line, source and drain electrodes of the thin film transistor, the capacitor electrode, or the power line. |