A display device comprising: a substrate comprising a display region including a plurality of pixels and a peripheral region excluding the display region; a plurality of first and second signal lines (121,171) formed on the substrate and insulated from each other; a plurality of driving voltage lines formed with a same layer as the first signal lines or the second signal lines and extending from the display region to the peripheral region; at least one driving voltage connection formed in the peripheral region with a different layer as driving voltage lines; at least one connecting member electrically connecting the driving voltage lines and the driving voltage connection, wherein the connecting member is formed in the peripheral region; at least one first thin film transistor connected to the first and second signal lines; at least one second thin film transistor connected to the first thin film transistor and the driving voltage lines; at least one first electrode connected to the second thin film transistor; a second electrode opposing the first electrode; at least one organic light emitting member formed between the first electrode and the second electrode; and at least one assistant member formed between the at least one connecting member and the second electrode to prevent the at least one connecting member from shorting with the second electrode; wherein the at least one assistant member is disposed in the peripheral region and comprises an insulating material, characterized in that the assistant member includes a same material as at least a portion of the organic light emitting member. a substrate comprising a display region including a plurality of pixels and a peripheral region excluding the display region; a plurality of first and second signal lines (121,171) formed on the substrate and insulated from each other; a plurality of driving voltage lines formed with a same layer as the first signal lines or the second signal lines and extending from the display region to the peripheral region; at least one driving voltage connection formed in the peripheral region with a different layer as driving voltage lines; at least one connecting member electrically connecting the driving voltage lines and the driving voltage connection, wherein the connecting member is formed in the peripheral region; at least one first thin film transistor connected to the first and second signal lines; at least one second thin film transistor connected to the first thin film transistor and the driving voltage lines; at least one first electrode connected to the second thin film transistor; a second electrode opposing the first electrode; at least one organic light emitting member formed between the first electrode and the second electrode; and at least one assistant member formed between the at least one connecting member and the second electrode to prevent the at least one connecting member from shorting with the second electrode; wherein the at least one assistant member is disposed in the peripheral region and comprises an insulating material, characterized in that the assistant member includes a same material as at least a portion of the organic light emitting member.