Organic light-emitting display and driving method thereof

An organic light-emitting display comprising:

• pixels arranged on a first pixel line to an nth pixel line, where n is a natural number,
• wherein each of the pixels includes:
• a driving transistor that drives an organic light-emitting diode;
• a first transistor connected between a data line supplying a data voltage and a gate electrode of the driving transistor, and turned on according to a scan signal;
• a second transistor connected between a reference voltage input line and a source electrode of the driving transistor;
• and
• a third transistor that directly charges the gate electrode of the driving transistor with a reference voltage supplied from the reference voltage input line, in response to a black data control signal,
• wherein the black data control signal is sequentially applied to the first pixel line to the nth pixel lines later than the scan signal, and
• wherein an interval between the scan signal and the black data control signal is the same in all pixel lines among the first pixel line to the nth pixel line.