A display device may include a display module and a cushion layer. The display module may include a display panel, which includes a circuit layer, a light emitting device layer on the circuit layer, and an encapsulation layer encapsulating the light emitting device layer, and a window substrate, which is on the display panel. A pattern including a vibration attenuating line extending in a direction may be defined by the cushion layer, and the cushion layer may be below the display module. The vibration attenuating line may be spaced apart from an edge of the cushion layer by a first length, and the first length may be a value obtained by dividing a sound speed in the display module by a natural frequency of the display module.