A display apparatus, comprising: a substrate; and a display unit disposed on the substrate, the display unit comprising a display region and a non-display region disposed around the display region, wherein the display unit comprises: at least one light-emitting device (OLED) disposed in the display region and including a first electrode, a second electrode facing the first electrode and an intermediate layer situated between the first and second electrodes, wherein an emission layer is included within the said intermediate layer; a first power supply line and a second power supply line configured to supply driving power to the at least one light-emitting device (OLED); wherein the first power supply line is a driving voltage line (ELVDD), and the second power supply line is a common voltage line (ELVSS); a plurality of first dependent lines disposed in the display area and electrically connected to the first power supply line and extending from the first power supply line in a second direction; and a pad unit disposed at a side of the display region; wherein the first power supply line is configured to supply a first voltage to the first dependent lines and the second power supply line is electrically connected to the second electrode and configured to supply a second voltage to the second electrode, the first power supply line comprises a first fan-out wire portion electrically connected to the pad unit, and a first extension portion electrically connected to the first fan-out wire portion in the non-display region, the second power supply line comprises a second fan-out wire portion electrically connected to the pad unit, and a second extension portion electrically connected to the second fan-out wire portion in the non-display region, and the first extension portion has a width W1 and the second extension portion has a width W2, wherein the first power supply line further comprises a first body portion, wherein the first body portion extends in a first direction and the first body portion is disposed on a same side of the display region as the pad unit; and characterized in that the width W1 is greater than the width W2. a substrate; and a display unit disposed on the substrate, the display unit comprising a display region and a non-display region disposed around the display region, wherein the display unit comprises: at least one light-emitting device (OLED) disposed in the display region and including a first electrode, a second electrode facing the first electrode and an intermediate layer situated between the first and second electrodes, wherein an emission layer is included within the said intermediate layer; a first power supply line and a second power supply line configured to supply driving power to the at least one light-emitting device (OLED); wherein the first power supply line is a driving voltage line (ELVDD), and the second power supply line is a common voltage line (ELVSS); a plurality of first dependent lines disposed in the display area and electrically connected to the first power supply line and extending from the first power supply line in a second direction; and a pad unit disposed at a side of the display region; a first power supply line and a second power supply line configured to supply driving power to the at least one light-emitting device (OLED); wherein the first power supply line is a driving voltage line (ELVDD), and the second power supply line is a common voltage line (ELVSS); a plurality of first dependent lines disposed in the display area and electrically connected to the first power supply line and extending from the first power supply line in a second direction; and a pad unit disposed at a side of the display region; wherein the first power supply line is configured to supply a first voltage to the first dependent lines and the second power supply line is electrically connected to the second electrode and configured to supply a second voltage to the second electrode, the first power supply line comprises a first fan-out wire portion electrically connected to the pad unit, and a first extension portion electrically connected to the first fan-out wire portion in the non-display region, the second power supply line comprises a second fan-out wire portion electrically connected to the pad unit, and a second extension portion electrically connected to the second fan-out wire portion in the non-display region, and the first extension portion has a width W1 and the second extension portion has a width W2, wherein the first power supply line further comprises a first body portion, wherein the first body portion extends in a first direction and the first body portion is disposed on a same side of the display region as the pad unit; and