Patent ID: 8368674

Claim:
An organic electroluminescent device, comprising: a gate line on a substrate; a data line crossing the gate line to define a pixel region; a power line crossing one of the gate line and the data line; a switching element; a driving element including: a driving gate electrode connected to the switching element, the driving gate electrode formed uniformly on the substrate; a gate-insulating layer on the driving gate electrode; a driving semiconductor layer on the gate-insulating layer; a driving source electrode connected to the power line, the driving source electrode having a first driving source electrode along a first direction and a plurality of second driving source electrodes extending from the first driving source electrode along a second direction crossing the first direction; a driving drain electrode spaced apart from the driving source electrode, the driving drain electrode having a first driving drain electrode along the first direction and a plurality of second driving drain electrodes extending from the first driving drain electrode along the second direction, wherein the plurality of second driving source electrodes alternate with the plurality of second driving drain electrodes, wherein the driving source electrode and the driving drain electrode including an interval therebetween are facing the driving gate electrode, wherein the first driving source electrode has a first portion overlapping one side portion of the driving gate electrode and a second portion not overlapping the one side portion of the driving gate electrode, wherein each of outermost second driving source electrodes of the plurality of second driving source electrodes has a first portion overlapping other two opposite side portions of the driving gate electrode and a second portion not overlapping the two opposite side portions of the driving gate electrode, wherein the driving semiconductor layer on the gate-insulating layer completely covers four sides of the driving gate electrode under the gate-insulating layer, and the four sides of the driving gate electrode are disposed within a perimeter of the driving semiconductor layer, wherein a channel region defined by the driving semiconductor layer exposed through the interval between the driving source electrode and the driving drain electrode and overlapping the driving gate electrode, wherein the channel region has a zigzag shape having horizontal portions and vertical portions perpendicular to the horizontal portions; and an organic electroluminescent diode connected to the driving element.