A display device comprising: a substrate ; a first transistor disposed on the substrate; a second transistor disposed on the substrate, and configured to transmit a data signal to the first transistor, a via layer covering the first transistor and the second transistor to perform a function of planarizing a step due to first and second transistors; a first bank and a second bank disposed on the via layer, and spaced apart from each other; a first electrode line disposed on the first bank; a second electrode line disposed on the second bank and spaced apart from the first electrode; a first insulating layer disposed to partially cover the first electrode line and the second electrode line; a light-emitting element disposed on the first insulating layer, and disposed between the first bank and the second bank, wherein the first transistor is configured to transmit a driving current to the light-emitting element; a second insulating layer partially disposed on the light-emitting element; a first contact electrode disposed on the first electrode line and the second insulating layer, and in contact with the light-emitting element; and a second contact electrode disposed on the second electrode line and the second insulating layer, and in contact with the light-emitting element, wherein the first transistor includes a first active layer , the second transistor includes a second active layer containing an oxide semiconductor, and the light-emitting element includes a first conductivity type semiconductor having a first polarity; a second conductivity type semiconductor having a second polarity different from the first polarity; and an active material layer disposed between the first conductivity type semiconductor and the second conductivity type semiconductor. a substrate ; a first transistor disposed on the substrate; a second transistor disposed on the substrate, and configured to transmit a data signal to the first transistor, a via layer covering the first transistor and the second transistor to perform a function of planarizing a step due to first and second transistors; a first bank and a second bank disposed on the via layer, and spaced apart from each other; a first electrode line disposed on the first bank; a second electrode line disposed on the second bank and spaced apart from the first electrode; a first insulating layer disposed to partially cover the first electrode line and the second electrode line; a light-emitting element disposed on the first insulating layer, and disposed between the first bank and the second bank, wherein the first transistor is configured to transmit a driving current to the light-emitting element; a second insulating layer partially disposed on the light-emitting element; a first contact electrode disposed on the first electrode line and the second insulating layer, and in contact with the light-emitting element; and a second contact electrode disposed on the second electrode line and the second insulating layer, and in contact with the light-emitting element, wherein the first transistor includes a first active layer , the second transistor includes a second active layer containing an oxide semiconductor, and the light-emitting element includes a first conductivity type semiconductor having a first polarity; a second conductivity type semiconductor having a second polarity different from the first polarity; and an active material layer disposed between the first conductivity type semiconductor and the second conductivity type semiconductor. <EOS>