An organic light emitting device including a first substrate, at least an organic light emitting unit, a plurality of first electrode contacts and a plurality of second electrode contacts. The organic light emitting unit is disposed on the first substrate. The first electrode contacts are disposed on the first substrate at a margin of the organic light emitting unit, wherein adjacent two first electrode contacts are spaced by a first interval, and an end of each first electrode contact is electrically connected to the organic light emitting unit. The second electrode contacts are disposed on the first substrate at a margin of the organic light emitting unit, wherein adjacent two second electrodes are spaced by a second interval, an end of each second electrode contact is electrically connected to the organic light emitting unit, and the second interval is different from the first interval.