Display device and method thereof

A display apparatus comprising:

• a display panel configured to display an image frame;
• an arithmetic operator configured to divide the image frame into pixel blocks, calculate pixel gradation values of the pixel blocks, and accumulate the calculated pixel gradation values, for a number of image frames displayed in succession or a time period;
• and
• a compensator configured to locally reduce a luminance of a corresponding pixel block, of which a respective accumulated pixel gradation value exceeds a threshold value of among the plurality of pixel blocks, and to compensate for a luminance difference between the corresponding pixel block, for which the luminance has been reduced, and surrounding pixel blocks which are disposed in a vicinity of the corresponding pixel block.