Organic light-emitting display device including an insulating layer having different thicknesses

Abstract

An organic light-emitting display device includes a buffer layer on a substrate that has a plurality of insulating layers having different refractive indexes, and at least one of the insulating layers have different thicknesses on the same level. The device further includes an active layer of a thin film transistor in a thick area of the buffer layer, a pixel electrode in a thin area of the buffer layer, a gate electrode of the thin film transistor on the active layer and source and drain electrodes of the thin film transistor connected to the active layer, and a gate insulating layer between the gate electrode and the source and drain electrodes. The device also includes an emission layer on the pixel electrode, an opposite electrode facing the pixel electrode, and the emission layer is between the opposite electrode and the pixel electrode.