An organic light emitting display device includes a substrate including a light-emitting region and a transparent region, a transistor disposed in the light-emitting region and including a gate electrode, a source electrode and a drain electrode overlapping the gate electrode, a capacitor disposed in the light-emitting region and disposed adjacent to the transistor and including a first capacitor electrode and a second capacitor electrode overlapping the first capacitor electrode, and a plurality of light-blocking patterns partially overlapping the gate electrode, the source electrode or the drain electrode and disposed on a different layer as a layer the gate electrode, the source electrode or the drain electrode are disposed.