Assuring uniformity in the output of an OLED

A method for generating correction data for pixels in an organic LED display device including a plurality of the pixels in a matrix pattern, each pixel including an organic LED dement, comprising:

• a) dividing a display area into a plurality of predetermined detection areas to selectively cause organic LED elements of a plurality of pixels in the detection areas to emit light to detect a driving current for each detection area;
• b) detecting, based on driving current values detected for respective detection areas, a detection area that includes a plurality of pixels, has a luminance value different from that of other detection areas and requires correction;
• c) calculating correction data required for correcting image data for each pixel in the detection area that requires correction, the calculation including:
• i) selecting a pixel area that is positioned around the detection area;
• ii) simultaneously activating a plurality of selected periphery pixels of the pixel area at a first input voltage level, and at a second voltage level, and measuring corresponding currents for each voltage level, to provide an average V-I characteristic of the pixel area, wherein the selected periphery pixels are outside the detection area;
• iii) while no other pixels are active, sequentially activating each pixel in the detection area at a third input voltage level and at a fourth input voltage level and measuring corresponding currents for each voltage level to provide a respective V-I characteristic of each pixel in the detection area;
• and
• iv) calculating, for each pixel in the detection area, correction data including a gain correction value and an offset of the V-I characteristic of the pixel with reference to the average V-I characteristic;
• and
• d) storing, in a memory, the correction data calculated for each pixel in the detection area.