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1. A display device comprising: a display panel including pixels; a data driver receiving sensing data corresponding to a driving current value of a driving transistor of each of the pixels; and a driving controller calculating a change amount of the sensing data, determining whether or not individual pixels are bad pixels based on the change amount of the sensing data for each individual pixel, and performing a panel protection operation based on a number of individual bad pixels that are determined to be bad pixels, wherein the driving controller determines the individual pixels in which the change amount of the sensing data is greater than or equal to a second reference value as individual bad candidate pixels, the driving controller determines the individual bad candidate pixels having the sensing data greater than or equal to a third reference value as the bad pixels, the driving controller determines the individual bad pixels based on the sensing data of the individual bad candidate pixels, the driving controller performs the panel protection operation in case that the number of individual pixels determined to be the bad pixels is greater than or equal to a first reference value, the driving controller determines first pixel columns based on the sensing data of the pixels, and the driving controller determines the bad candidate pixels from among the pixels excluding pixels included in the first pixel columns; wherein the driving controller calculates an average value of the sensing data of the pixels included in an N-th pixel row, the driving controller determines the pixels included in the N-th pixel row in which a difference between the sensing data of the pixels and the average value is greater than or equal to a fifth reference value as excluded candidate pixels, the driving controller determines a M-th pixel column as one of the first pixel columns in case that a number of the excluded candidate pixels included in the M-th pixel column is greater than or equal to a sixth reference value, and each of N and M is a positive integer.
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