In an embodiment, an array substrate includes a substrate having a display region and a package region surrounding the display region, wherein the display region comprises a side region adjacent to the package region; a pixel definition layer disposed on the display region of the substrate, wherein the pixel definition layer is formed with a plurality of recesses and a plurality of corresponding protrusions surrounding each recess, and each recess and each protrusion correspond to the side region; and a cathode trace disposed on a surface of each protrusion and a bottom surface of each recess, wherein a gap exists between the cathode trace on each protrusion and the cathode trace in each recess.