As described above with reference to FIG. 18, the second horizontal connection line DH2 is electrically connected to the second additional vertical connection line DV2 via the first connecting contact hole DH-CNT1 at the opposite end (in the +x direction) thereof. As shown in FIG. 20, the third data line DL3 intersects the second horizontal connection line DH2, but is not electrically connected to the second horizontal connection line DH2. However, an island that is disposed on the same layer as the second horizontal connection line DH2, includes the same material, and is spaced apart from the second horizontal connection line DH2, is under the third data line DL3, and the third data line DL3 may be electrically connected to the island via a contact hole. As such, the third data line DL3 as shown in FIG. 20 may have a contact hole connecting structure that is similar to that of the fourth data line DL4 as shown in FIG. 19, and the pixels may have a substantially identical or similar structure(s).