Patent ID: 8421940

Claim:
A display device comprising a TFT substrate in which a plurality of first TFT elements each having an active layer comprised of an amorphous semiconductor and a plurality of second TFT elements each having an active layer comprised of a polycrystalline semiconductor are disposed on a surface of an insulating substrate, wherein the first TFT element and the second TFT element each include: an inverted staggered structure including a gate electrode, a gate insulating film, and the active layer stacked in this order on the surface of the insulating substrate and a source electrode and a drain electrode both connected to the active layer via a contact layer above the active layer as viewed from the insulating substrate, wherein the active layer comprised of the polycrystalline semiconductor of the second TFT element has a thickness of 60 nm or more in a position where the contact layer is stacked.