A pixel including a LED and a pixel circuit. The circuit including a first transistor supplying a current to the LED corresponding to a data signal applied to a data line, a capacitor coupled to the first transistor and charged by the data signal, a second transistor coupled to a scan line and the data line supplying the data signal to the capacitor when a scan signal is being supplied, and a third transistor coupled between the first transistor and the LED and having a gate coupled to a gate of the first transistor. The pixel circuit displays images of uniform luminance by charging the threshold voltage of the first transistor in the capacitor. Further, because voltages of the gate and the second terminal of the first transistor are kept approximately equal, it is possible to display images of desired luminance by eliminating leakage current and kink effect.