An organic light-emitting display is disclosed. In one embodiment, the display includes i) a substrate, ii) a thin film transistor formed on the substrate, and comprising i) a gate electrode, ii) an active layer electrically insulated from the gate electrode, and iii) source and drain electrodes that are electrically connected to the active layer and iii) a first electrode electrically connected to the thin film transistor. The display further includes an intermediate layer formed on the first electrode and comprising an organic emission layer and a second electrode formed on the intermediate layer, wherein the source electrode or the drain electrode has an optical blocking portion extending in the direction of substrate thickness.