A display apparatus comprising: a substrate including a component area and a main display area, the component area including sub display areas and transmission areas, and the main display area surrounding the component area; main pixel electrodes disposed in the main display area and spaced apart from each other; sub pixel electrodes disposed in the sub display areas and spaced apart from each other; a pixel definition layer covering an edge of each of the main pixel electrodes and an edge of each of the sub pixel electrodes, and including transmission holes in areas corresponding to the transmission areas; main spacers disposed on the pixel definition layer in the main display area; and sub spacers disposed on the pixel definition layer in the component area, wherein a number of the sub spacers per unit area is equal to a number of the main spacers per unit area in a plan view and/or an area occupied by the sub spacers per unit area in the sub display area is equal to an area occupied by the main spacers per unit area in the main display area in a plan view, wherein the main spacers include first main spacers arranged at a certain interval from one another and second main spacers arranged at a certain interval from one another, so that the first main spacers and the second main spacers are provided pairwise, and the first main spacers and the second main spacers are in a one-to-one correspondence to each other, wherein the sub spacers include first sub spacers arranged at a certain interval from one another and second sub spacers arranged at a certain interval from one another, and the first sub spacers and the second sub spacers are in a one-to-one correspondence to each other, wherein the first sub spacers in the sub display area are disposed in areas corresponding to the first main spacers in the main display area, and wherein the transmission holes of the pixel definition layer in the sub display area are disposed in areas corresponding to the second main spacers in the main display area. a substrate including a component area and a main display area, the component area including sub display areas and transmission areas, and the main display area surrounding the component area; main pixel electrodes disposed in the main display area and spaced apart from each other; sub pixel electrodes disposed in the sub display areas and spaced apart from each other; a pixel definition layer covering an edge of each of the main pixel electrodes and an edge of each of the sub pixel electrodes, and including transmission holes in areas corresponding to the transmission areas; main spacers disposed on the pixel definition layer in the main display area; and sub spacers disposed on the pixel definition layer in the component area, wherein a number of the sub spacers per unit area is equal to a number of the main spacers per unit area in a plan view and/or an area occupied by the sub spacers per unit area in the sub display area is equal to an area occupied by the main spacers per unit area in the main display area in a plan view, wherein the main spacers include first main spacers arranged at a certain interval from one another and second main spacers arranged at a certain interval from one another, so that the first main spacers and the second main spacers are provided pairwise, and the first main spacers and the second main spacers are in a one-to-one correspondence to each other, wherein the sub spacers include first sub spacers arranged at a certain interval from one another and second sub spacers arranged at a certain interval from one another, and the first sub spacers and the second sub spacers are in a one-to-one correspondence to each other, wherein the first sub spacers in the sub display area are disposed in areas corresponding to the first main spacers in the main display area, and wherein the transmission holes of the pixel definition layer in the sub display area are disposed in areas corresponding to the second main spacers in the main display area.