A method of controlling a driving voltage of a display apparatus includes transmitting a ready signal from a timing control circuit of the display apparatus to a power management circuit of the display apparatus through a connection area of a connection member of the display apparatus, which is disposed between a display panel and a main circuit board of the display apparatus, and controlling a generation of the driving voltage from the power management circuit based on the ready signal received by the power management circuit, where the display apparatus includes a gate driver circuit disposed on the display panel, and the timing control circuit and the power management circuit are disposed on the main circuit board.