A display module, comprising: a window member including a convex upper surface, wherein a first window area has a first average thickness and a second window area has a second average thickness greater than the first average thickness; and a display panel including: a first display area overlapped by the first window area in a thickness direction and including a plurality of first pixels, and a second display area overlapped by the second window area in the thickness direction and including a plurality of second pixels, wherein at least one of the plurality of second pixels has a second pixel area smaller than a first pixel area of at least one of the plurality of first pixels, wherein the window member includes a flat lower surface, the display module being characterized in that the first and second pixels (PX1, PX2) satisfy the equation (ES1/PS1)<(ES2/PS2), wherein PS1 denotes the first pixel area, ES1 denotes a first light emitting area of at least one of the plurality of first pixels, PS2 denotes the second pixel area, and ES2 denotes a second light emitting area of at least one of the plurality of second pixels, wherein the display panel further comprises a first pixel definition layer exposing a lower electrode of at least one of the plurality of first pixels to correspond to the first light emitting area, and a second pixel definition layer exposing a lower electrode of at least one of the plurality of the second pixels to correspond to the second light emitting area. a window member including a convex upper surface, wherein a first window area has a first average thickness and a second window area has a second average thickness greater than the first average thickness; and a display panel including: a first display area overlapped by the first window area in a thickness direction and including a plurality of first pixels, and a second display area overlapped by the second window area in the thickness direction and including a plurality of second pixels, wherein at least one of the plurality of second pixels has a second pixel area smaller than a first pixel area of at least one of the plurality of first pixels, wherein the window member includes a flat lower surface, a first display area overlapped by the first window area in a thickness direction and including a plurality of first pixels, and a second display area overlapped by the second window area in the thickness direction and including a plurality of second pixels, wherein at least one of the plurality of second pixels has a second pixel area smaller than a first pixel area of at least one of the plurality of first pixels, wherein the window member includes a flat lower surface, the first and second pixels (PX1, PX2) satisfy the equation (ES1/PS1)<(ES2/PS2), wherein PS1 denotes the first pixel area, ES1 denotes a first light emitting area of at least one of the plurality of first pixels, PS2 denotes the second pixel area, and ES2 denotes a second light emitting area of at least one of the plurality of second pixels, wherein the display panel further comprises a first pixel definition layer exposing a lower electrode of at least one of the plurality of first pixels to correspond to the first light emitting area, and a second pixel definition layer exposing a lower electrode of at least one of the plurality of the second pixels to correspond to the second light emitting area.