In an aspect, an array substrate for a flexible display device is provided, the array substrate including: a mother substrate; a plurality of display units that are spaced apart from each other on the mother substrate, the plurality of display units each including a display region for displaying an image and a non-display region extending from the display region; a sealing unit covering the display region of each of the plurality of display units; and a plurality of test wire lines formed in a wire region between the adjacent display units on the mother substrate, that are electrically connected to each of the plurality of display units, and having a pattern.