A method for manufacturing a display device including forming a first color filter transmitting a first color light on a base substrate to overlap first light-emitting areas, forming a second color filter transmitting a second color light different from the first color light to overlap second light-emitting areas and a first portion of a light-blocking area disposed between the first light-emitting areas, forming a partition wall including a first opening continuously overlapping the first light-emitting areas and the first portion of the light-blocking area, providing a first composition including a wavelength-converting material in the first opening, and curing the first composition to form a first color-converting layer.