Organic light emitting display capable of compensating for luminance variations caused by changes in driving element over time and method of manufacturing the same

A method of manufacturing an organic light emitting display, the method comprising:

• providing a display panel comprising a plurality of pixels, each pixel comprising:
• a light emitting element;
• and
• a driving element configured to drive the light emitting element;
• providing a data driving circuit configured to, within one horizontal display period allocated to each horizontal display line of the display panel to write image display data:
• write sensing data to a pixel on a horizontal display line through a data line;
• sense the pixel current of the pixel through a reference line;
• and
• then write display data compensated by a first offset compensation value to the pixel;
• providing an offset calculator configured to calculate a second offset compensation value for compensating changes in the driving element over time based on the sensed value of the pixel current;
• and
• providing an offset memory configured to update the pre-stored first offset compensation value with the second offset compensation value within a vertical blank period when display data writing is stopped.