The invention provides a flat panel display having an insulating substrate; a data line formed on the insulating substrate; an interlayer insulating film formed on the data line having a first contact opening exposing the data line; a connecting member formed in a part of the first contact opening; an interlayer insulating film around the first contact opening; a gate insulating film formed on the connecting member having a second contact opening exposing the connecting member; and an organic semiconductor layer formed on the gate insulating film.