Method of controlling a dimming operation and organic light emitting display device performing the same

An organic light emitting display device comprising:

• a display panel including a plurality of sub-pixels, and each of the sub-pixels comprising an organic light emitting element, a first transistor connected a data line and a gate line, a second transistor connected to the first transistor and the organic light emitting element, and a third transistor connected to the second transistor and adjusting a level of a current applied to the organic light emitting element;
• a data compensating part compensating image data using a plurality of look-up tables respectively corresponding to a plurality of dimming modes, to output compensation data;
• a data driving part converting the compensation data to a data voltage to provide the data line with the data voltage;
• and
• a scan driving part generating a scan signal to provide the gate line with the scan signal.

An organic light emitting display device comprising:

• a display panel including a plurality of sub-pixels, and each of the sub-pixels comprising an organic light emitting element, a first transistor connected a data line and a gate line, a second transistor connected to the first transistor and the organic light emitting element, and a third transistor connected to the second transistor and adjusting a level of a current applied to the organic light emitting element;
• a data compensating part compensating image data using a look-up table to output compensation data;
• a data driving part converting the compensation data to a data voltage to provide the data line with the data voltage;
• and
• a scan driving part generating a scan signal to provide the scan signal with the gate line, the scan signal having a different pulse width according to the dimming mode.