Patent ID: 8633484

Claim:
An organic light emitting display, comprising: a substrate, the substrate including a first thin film transistor region and a second thin film transistor region; a buffer layer on the substrate; a first semiconductor layer and a second semiconductor layer on the buffer layer; a gate insulating layer on the substrate; gate electrodes on the gate insulating layer, the gate electrodes corresponding to the first semiconductor layer and the second semiconductor layer, respectively; source/drain electrodes insulated from the gate electrode, one of the source/drain electrodes being electrically connected to the first semiconductor layer and another of the source drain electrodes being electrically connected to the second semiconductor layer, respectively; an insulating layer on the substrate; a first electrode connected to the one source/drain electrode electrically connected to the first semiconductor layer; an organic layer on the first electrode; and a second electrode on the organic layer, wherein portions of the buffer layer corresponding to a source/drain region of the first semiconductor layer include a metal catalyst, and wherein the portions of the buffer layer including the metal catalyst have a thickness greater than other portions of the buffer layer.