Display device and display device driving method

A display device which includes a display screen in which pixels are arranged in a matrix, each of the pixels including a light-emitting element, the display device comprising:

• a correction circuit which corrects an input gradation value indicated by a luminance signal included in a video signal, wherein
• the correction circuit includes:
• a luminance converter which converts the input gradation value into a target luminance value corresponding to the input gradation value;
• a correction calculator which calculates an output gradation value from the target luminance value using an efficiency residual ratio which is an index representing a degree of deterioration of the light-emitting element, and calculates a corrected luminance value from the output gradation value, the output gradation value being obtained by correcting the input gradation value, the efficiency residual ratio indicating a residual ratio of light emission efficiency of the light-emitting element, the corrected luminance value being obtained by correcting the target luminance value;
• a current stress calculator which converts a current stress amount on the light-emitting element that is calculated from the corrected luminance value into a first stress amount indicating a current stress amount when a reference current flows through the light-emitting element, and calculates an accumulated first stress amount obtained by accumulating the first stress amount resulting from the conversion;
• a temperature stress calculator which converts a temperature stress amount on the light-emitting element under environmental temperature into a second stress amount indicating a temperature stress amount on the light-emitting element under a reference temperature, and calculates an accumulated second stress amount obtained by accumulating the second stress amount resulting from the conversion;
• and
• an efficiency residual ratio calculator which updates the efficiency residual ratio, using the accumulated first stress amount and the accumulated second stress amount that are calculated.