Organic light emitting display device and driving method thereof

An organic light emitting display device comprising:

• a display panel including a plurality of pixels each having an organic light emitting element that emits light according to a current corresponding to a data voltage;
• and
• a panel driver configured to:
• divide the display panel into first to Mth blocks, each of the first to Mth blocks having a plurality of lines of pixels,
• calculate an average grayscale value of data to be displayed in the plurality of pixels of each block as an average picture level of each block,
• convert the data to be displayed by each of the plurality of pixels of each block into the data voltage, and
• supply the data voltage to each of the plurality of pixels of each block,
• wherein the panel driver controls the data voltage to be supplied to an ith block on the basis of the average picture levels of M number of blocks driven previous to the ith block, where i is a natural number from 1 to M;
• wherein the panel driver comprises a timing controller configured to:
• calculate the average picture levels of each block,
• store the calculated average picture levels,
• calculate an average picture level for luminance control on the basis of the average picture levels of the M blocks driven previous to the ith block at a display time of the ith block, and
• generate a peak luminance gain value according to the average image level for luminance control,
• wherein the timing controller is configured to calculate an average frame picture level on the basis of the stored respective average picture levels of the first to Mth blocks at every display completion time of one frame, and adjust the peak luminance gain value according to a comparison of the respective average frame picture levels of first and second previous frames that are previous to a current frame.