Organic electro-luminescence display device and driving method thereof

A driving method of an organic electro luminescence display device where a plurality of data lines cross a plurality of scan lines and electro luminescence cells are arranged in the crossing parts thereof, comprising:

• supplying a pre-charge current to the data line in accordance with gray levels of data;
• charging a data current to the data line for a designated period which is set before a scan pulse is supplied to the electro luminescence cell and after the pre-charge current is supplied;
• and
• making the electro luminescence cells emit light by use of the charged current and the data current synchronized with the scan pulse to be supplied to the electro luminescence cell,
• wherein the designated period before the scan pulse is supplied to the electro luminescence cells and after the pre-charge current is supplied is obtained by maintaining the light emitting period of the electro luminescence cells and by lengthening a period from a starting point of the scan pulse to a starting point of the next scan pulse.