A display device includes a first semiconductor pattern on a substrate, a first insulating layer on the first semiconductor pattern, a first gate electrode on the first insulating layer, a second insulating layer on the first gate electrode, a second semiconductor pattern on the second insulating layer, a material of the second semiconductor pattern being different from that of the first semiconductor pattern, a third insulating layer on the second semiconductor pattern, a second gate electrode on the third insulating layer, a first planarization layer overlapping the second gate electrode, a second planarization layer on the first planarization layer and including a light blocking portion, and a pixel definition layer on the second planarization layer, wherein at least a portion of the pixel definition layer directly contacts the light blocking portion of the second planarization layer.