A display device includes a light emitting diode, and first and second driving transistors connected between a driving voltage and the light emitting diode to supply driving electric current to the light emitting diode. An actuating rod received through the delivery tube and threadably mated with the docking arm adjusts the delivery tube relative to the docking arm to push the coupling members together causing them to fasten to one another and join the tissue segments. Thus, the displayed picture quality can be significantly improved. The face portion is configured on that side of the profile which produces a lifting force counter-directional to a steering force, deriving from the motor torque, upon the wing profile.