Patent ID: 8664659

Claim:
An organic light-emitting diode (OLED) display apparatus comprising: a plurality of thin film transistors (TFT) which are formed on a substrate; a plurality of pixels comprising a planarizing layer; a first electrode which is formed on the planarizing layer in each pixel, wherein the planarizing layer covers the TFT; a plurality of pixel-defining layers (PDLs) which comprise a first PDL covering an end of the first electrode and a second PDL contacting the first PDL, exposing an end of the first PDL and covering the first PDL; an intermediate layer formed on the first electrode and comprising an emission layer (EML); and a second electrode which is positioned opposite to the first electrode; wherein the second PDL has a thickness from about 0.1 μm to about 2 μm in a direction in which different color pixels are arrayed, and a thickness from about 0.1 μm to about 1 μm in a direction in which equal color pixels are arrayed.