Display device and driving method of the same

A display device, comprising:

• a display panel including a plurality of pixels each composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel;
• a threshold voltage sensor configured to sense a threshold voltage of a white light emitting element included in the white sub-pixel;
• a data compensation circuit configured to correct data signal depending on a variation in the threshold voltage and generate compensated data signal;
• and
• a data driver configured to generate a data voltage according to the compensated data signal and output the data voltage to the display panel,
• wherein the data compensation circuit calculates an initial white gain depending on the variation in the threshold voltage, and
• if the initial white gain is higher than a critical white gain, the data compensation circuit converts an excess white gain corresponding to a difference between the initial white gain and the critical white gain into at least one of a red gain, a green gain and a blue gain, and
• the data compensation circuit applies the red gain to red data signal, the green gain to green data signal, and the blue gain to blue data signal to generate the compensated data signal.