cathode bus line 170 is formed along the pixel region 100 in the non pixel region 101 so that the cathode bus line 170 and the cathode electrode 190 are electrically and directly coupled to each other in all directions of the non pixel region 100 in accordance with an embodiment of the present invention the cathode bus line is formed in at least one portion of the non pixel region so that the cathode bus line and the cathode electrode are electrically and directly coupled to each other through the contact region of the non pixel region even when the charge transporting layer is deposited on the entire surface of the pixel region using an open mask in addition to the structure connecting the cathode bus line to the cathode electrode as shown in an embodiment of the present invention the cathode bus line and the cathode electrode may be connected in the non pixel region which is the outer portion of the pixel region fig3 a illustrates a plan view of an organic light emitting device in accordance with an embodiment of the present invention referring to fig3 a a cathode bus line 370 is formed in a grid or matrix shape only in the pixel region 100 so that the cathode bus line 370 and a cathode electrode 390 are electrically and directly coupled to each other through a contact region 303 per each pixel fig4 illustrates a cross sectional view of the.