A display device has pixels that compensate a threshold voltage of a driving transistor through decreasing the discharge time of a capacitor coupled to the driving transistor. The capacitor may be embodied as a metal-oxide-semiconductor (MOS) transistor. The capacitor may include a non-uniform channel region having a capacitance that increases with a decrease of a gate-source voltage applied to the capacitor and decrease with an increase of the gate-source voltage applied to the capacitor.

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