The present disclosure relates to a display device comprising an insulating substrate; a source electrode and a drain electrode on the insulating substrate and separated by a channel area; an organic semiconductor layer formed in the channel area and on at least a portion of the source electrode and at least a portion of the drain electrode; and a self-assembly monolayer having a first portion disposed between the organic semiconductor layer and the source electrode and a second portion disposed between the organic semiconductor layer and the drain electrode to reduce contact resistance between the electrodes and the organic semiconductor layer. Thus, embodiments of present invention provide a display device including a TFT that is enhanced in its performance.