A display apparatus includes a substrate including a main display area, a component area, and a peripheral area. The component area includes a transmission area, and the peripheral area is arranged outside the main display area. The display apparatus further includes a main thin-film transistor arranged in the main display area, a main organic light-emitting diode arranged in the main display area and connected to the main thin-film transistor, an auxiliary thin-film transistor arranged in the component area, an auxiliary organic light-emitting diode arranged in the component area and connected to the auxiliary thin-film transistor, and a lower metal layer arranged between the substrate and the auxiliary thin-film transistor in the component area and having an undercut structure.