A method of manufacturing a display device includes preparing a carrier substrate, forming a first substrate layer on the carrier substrate, forming a first, second, and third through holes in the first substrate layer, forming a first intermediate conductive layer having a first exposed portion and a second exposed portion, forming a second intermediate conductive layer having a third exposed portion, forming a second substrate layer on the first substrate layer to cover the first intermediate conductive layer and the second intermediate conductive layer, forming a fourth through hole in the second substrate layer, forming a wiring on the second substrate layer, separating the first substrate layer from the carrier substrate, arranging a first electronic device on a surface of the first substrate layer, and arranging a second electronic device on the surface of the first substrate layer.